Merge "Add JIT"

83 files changed, 2221 insertions, 449 deletions

diff --git a/.gitignore b/.gitignore
index 1cdfed9..3d1658d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@ USE_LLVM_COMPILER
 USE_PORTABLE_COMPILER
 SMALL_ART
 SEA_IR_ART
+JIT_ART
diff --git a/build/Android.common_build.mk b/build/Android.common_build.mk
index 3000cdf..f05ca87 100644
--- a/build/Android.common_build.mk
+++ b/build/Android.common_build.mk
@@ -48,6 +48,18 @@ $(info Disabling ART_BUILD_HOST_DEBUG)
 endif
 
 #
+# Used to enable JIT
+#
+ART_JIT := false
+ifneq ($(wildcard art/JIT_ART),)
+$(info Enabling ART_JIT because of existence of art/JIT_ART)
+ART_JIT := true
+endif
+ifeq ($(WITH_ART_JIT), true)
+ART_JIT := true
+endif
+
+#
 # Used to enable smart mode
 #
 ART_SMALL_MODE := false
diff --git a/cmdline/cmdline_parser_test.cc b/cmdline/cmdline_parser_test.cc
index b740b41..18d8c7a 100644
--- a/cmdline/cmdline_parser_test.cc
+++ b/cmdline/cmdline_parser_test.cc
@@ -411,6 +411,26 @@ TEST_F(CmdlineParserTest, TestCompilerOption) {
 }  // TEST_F
 
 /*
+* -Xjit, -Xnojit, -Xjitcodecachesize, Xjitcompilethreshold
+*/
+TEST_F(CmdlineParserTest, TestJitOptions) {
+ /*
+  * Test successes
+  */
+  {
+    EXPECT_SINGLE_PARSE_VALUE(true, "-Xjit", M::UseJIT);
+    EXPECT_SINGLE_PARSE_VALUE(false, "-Xnojit", M::UseJIT);
+  }
+  {
+    EXPECT_SINGLE_PARSE_VALUE(MemoryKiB(16 * KB), "-Xjitcodecachesize:16K", M::JITCodeCacheCapacity);
+    EXPECT_SINGLE_PARSE_VALUE(MemoryKiB(16 * MB), "-Xjitcodecachesize:16M", M::JITCodeCacheCapacity);
+  }
+  {
+    EXPECT_SINGLE_PARSE_VALUE(12345u, "-Xjitthreshold:12345", M::JITCompileThreshold);
+  }
+}  // TEST_F
+
+/*
 * -X-profile-*
 */
 TEST_F(CmdlineParserTest, TestProfilerOptions) {
@@ -495,9 +515,8 @@ TEST_F(CmdlineParserTest, TestIgnoredArguments) {
       "-dsa", "-enablesystemassertions", "-disablesystemassertions", "-Xrs", "-Xint:abdef",
       "-Xdexopt:foobar", "-Xnoquithandler", "-Xjnigreflimit:ixnay", "-Xgenregmap", "-Xnogenregmap",
       "-Xverifyopt:never", "-Xcheckdexsum", "-Xincludeselectedop", "-Xjitop:noop",
-      "-Xincludeselectedmethod", "-Xjitthreshold:123", "-Xjitcodecachesize:12345",
-      "-Xjitblocking", "-Xjitmethod:_", "-Xjitclass:nosuchluck", "-Xjitoffset:none",
-      "-Xjitconfig:yes", "-Xjitcheckcg", "-Xjitverbose", "-Xjitprofile",
+      "-Xincludeselectedmethod", "-Xjitblocking", "-Xjitmethod:_", "-Xjitclass:nosuchluck",
+      "-Xjitoffset:none", "-Xjitconfig:yes", "-Xjitcheckcg", "-Xjitverbose", "-Xjitprofile",
       "-Xjitdisableopt", "-Xjitsuspendpoll", "-XX:mainThreadStackSize=1337"
   };
 
diff --git a/cmdline/cmdline_types.h b/cmdline/cmdline_types.h
index 180baec..04ea368 100644
--- a/cmdline/cmdline_types.h
+++ b/cmdline/cmdline_types.h
@@ -585,6 +585,8 @@ struct CmdlineType<LogVerbosity> : CmdlineTypeParser<LogVerbosity> {
         log_verbosity.heap = true;
       } else if (verbose_options[j] == "jdwp") {
         log_verbosity.jdwp = true;
+      } else if (verbose_options[j] == "jit") {
+        log_verbosity.jit = true;
       } else if (verbose_options[j] == "jni") {
         log_verbosity.jni = true;
       } else if (verbose_options[j] == "monitor") {
diff --git a/compiler/Android.mk b/compiler/Android.mk
index beb34dc..86a27c1 100644
--- a/compiler/Android.mk
+++ b/compiler/Android.mk
@@ -79,6 +79,7 @@ LIBART_COMPILER_SRC_FILES := \
 	driver/compiler_driver.cc \
 	driver/compiler_options.cc \
 	driver/dex_compilation_unit.cc \
+	jit/jit_compiler.cc \
 	jni/quick/arm/calling_convention_arm.cc \
 	jni/quick/arm64/calling_convention_arm64.cc \
 	jni/quick/mips/calling_convention_mips.cc \
@@ -161,8 +162,7 @@ LIBART_COMPILER_ENUM_OPERATOR_OUT_HEADER_FILES := \
   driver/compiler_options.h \
   image_writer.h \
   optimizing/locations.h \
-  utils/arm/constants_arm.h \
-  utils/dex_instruction_utils.h
+  utils/arm/constants_arm.h
 
 # $(1): target or host
 # $(2): ndebug or debug
diff --git a/compiler/common_compiler_test.cc b/compiler/common_compiler_test.cc
index 1cd78f8..e8354b2 100644
--- a/compiler/common_compiler_test.cc
+++ b/compiler/common_compiler_test.cc
@@ -52,19 +52,19 @@ void CommonCompilerTest::MakeExecutable(mirror::ArtMethod* method) {
     const SwapVector<uint8_t>* code = compiled_method->GetQuickCode();
     uint32_t code_size = code->size();
     CHECK_NE(0u, code_size);
-    const SwapVector<uint8_t>& vmap_table = compiled_method->GetVmapTable();
-    uint32_t vmap_table_offset = vmap_table.empty() ? 0u
-        : sizeof(OatQuickMethodHeader) + vmap_table.size();
+    const SwapVector<uint8_t>* vmap_table = compiled_method->GetVmapTable();
+    uint32_t vmap_table_offset = vmap_table->empty() ? 0u
+        : sizeof(OatQuickMethodHeader) + vmap_table->size();
     const SwapVector<uint8_t>* mapping_table = compiled_method->GetMappingTable();
     bool mapping_table_used = mapping_table != nullptr && !mapping_table->empty();
     size_t mapping_table_size = mapping_table_used ? mapping_table->size() : 0U;
     uint32_t mapping_table_offset = !mapping_table_used ? 0u
-        : sizeof(OatQuickMethodHeader) + vmap_table.size() + mapping_table_size;
+        : sizeof(OatQuickMethodHeader) + vmap_table->size() + mapping_table_size;
     const SwapVector<uint8_t>* gc_map = compiled_method->GetGcMap();
     bool gc_map_used = gc_map != nullptr && !gc_map->empty();
     size_t gc_map_size = gc_map_used ? gc_map->size() : 0U;
     uint32_t gc_map_offset = !gc_map_used ? 0u
-        : sizeof(OatQuickMethodHeader) + vmap_table.size() + mapping_table_size + gc_map_size;
+        : sizeof(OatQuickMethodHeader) + vmap_table->size() + mapping_table_size + gc_map_size;
     OatQuickMethodHeader method_header(mapping_table_offset, vmap_table_offset, gc_map_offset,
                                        compiled_method->GetFrameSizeInBytes(),
                                        compiled_method->GetCoreSpillMask(),
@@ -72,14 +72,14 @@ void CommonCompilerTest::MakeExecutable(mirror::ArtMethod* method) {
 
     header_code_and_maps_chunks_.push_back(std::vector<uint8_t>());
     std::vector<uint8_t>* chunk = &header_code_and_maps_chunks_.back();
-    size_t size = sizeof(method_header) + code_size + vmap_table.size() + mapping_table_size +
+    size_t size = sizeof(method_header) + code_size + vmap_table->size() + mapping_table_size +
         gc_map_size;
     size_t code_offset = compiled_method->AlignCode(size - code_size);
     size_t padding = code_offset - (size - code_size);
     chunk->reserve(padding + size);
     chunk->resize(sizeof(method_header));
     memcpy(&(*chunk)[0], &method_header, sizeof(method_header));
-    chunk->insert(chunk->begin(), vmap_table.begin(), vmap_table.end());
+    chunk->insert(chunk->begin(), vmap_table->begin(), vmap_table->end());
     if (mapping_table_used) {
       chunk->insert(chunk->begin(), mapping_table->begin(), mapping_table->end());
     }
@@ -212,7 +212,7 @@ void CommonCompilerTest::CompileMethod(mirror::ArtMethod* method) {
   CHECK(method != nullptr);
   TimingLogger timings("CommonTest::CompileMethod", false, false);
   TimingLogger::ScopedTiming t(__FUNCTION__, &timings);
-  compiler_driver_->CompileOne(method, &timings);
+  compiler_driver_->CompileOne(Thread::Current(), method, &timings);
   TimingLogger::ScopedTiming t2("MakeExecutable", &timings);
   MakeExecutable(method);
 }
diff --git a/compiler/compiled_method.cc b/compiler/compiled_method.cc
index 22be28c..1849e7e 100644
--- a/compiler/compiled_method.cc
+++ b/compiler/compiled_method.cc
@@ -20,16 +20,29 @@
 namespace art {
 
 CompiledCode::CompiledCode(CompilerDriver* compiler_driver, InstructionSet instruction_set,
-                           const ArrayRef<const uint8_t>& quick_code)
+                           const ArrayRef<const uint8_t>& quick_code, bool owns_code_array)
     : compiler_driver_(compiler_driver), instruction_set_(instruction_set),
-      quick_code_(nullptr) {
+      owns_code_array_(owns_code_array), quick_code_(nullptr) {
   SetCode(&quick_code);
 }
 
 void CompiledCode::SetCode(const ArrayRef<const uint8_t>* quick_code) {
   if (quick_code != nullptr) {
     CHECK(!quick_code->empty());
-    quick_code_ = compiler_driver_->DeduplicateCode(*quick_code);
+    if (owns_code_array_) {
+      // If we are supposed to own the code, don't deduplicate it.
+      CHECK(quick_code_ == nullptr);
+      quick_code_ = new SwapVector<uint8_t>(quick_code->begin(), quick_code->end(),
+                                            compiler_driver_->GetSwapSpaceAllocator());
+    } else {
+      quick_code_ = compiler_driver_->DeduplicateCode(*quick_code);
+    }
+  }
+}
+
+CompiledCode::~CompiledCode() {
+  if (owns_code_array_) {
+    delete quick_code_;
   }
 }
 
@@ -46,11 +59,11 @@ bool CompiledCode::operator==(const CompiledCode& rhs) const {
   return (rhs.quick_code_ == nullptr);
 }
 
-uint32_t CompiledCode::AlignCode(uint32_t offset) const {
+size_t CompiledCode::AlignCode(size_t offset) const {
   return AlignCode(offset, instruction_set_);
 }
 
-uint32_t CompiledCode::AlignCode(uint32_t offset, InstructionSet instruction_set) {
+size_t CompiledCode::AlignCode(size_t offset, InstructionSet instruction_set) {
   return RoundUp(offset, GetInstructionSetAlignment(instruction_set));
 }
 
@@ -120,17 +133,39 @@ CompiledMethod::CompiledMethod(CompilerDriver* driver,
                                const ArrayRef<const uint8_t>& native_gc_map,
                                const ArrayRef<const uint8_t>& cfi_info,
                                const ArrayRef<LinkerPatch>& patches)
-    : CompiledCode(driver, instruction_set, quick_code), frame_size_in_bytes_(frame_size_in_bytes),
-      core_spill_mask_(core_spill_mask), fp_spill_mask_(fp_spill_mask),
-      src_mapping_table_(src_mapping_table == nullptr ?
-          driver->DeduplicateSrcMappingTable(ArrayRef<SrcMapElem>()) :
-          driver->DeduplicateSrcMappingTable(ArrayRef<SrcMapElem>(src_mapping_table->Arrange()))),
-      mapping_table_(mapping_table.data() == nullptr ?
-          nullptr : driver->DeduplicateMappingTable(mapping_table)),
-      vmap_table_(driver->DeduplicateVMapTable(vmap_table)),
-      gc_map_(native_gc_map.data() == nullptr ? nullptr : driver->DeduplicateGCMap(native_gc_map)),
-      cfi_info_(cfi_info.data() == nullptr ? nullptr : driver->DeduplicateCFIInfo(cfi_info)),
+    : CompiledCode(driver, instruction_set, quick_code, !driver->DedupeEnabled()),
+      owns_arrays_(!driver->DedupeEnabled()),
+      frame_size_in_bytes_(frame_size_in_bytes), core_spill_mask_(core_spill_mask),
+      fp_spill_mask_(fp_spill_mask),
       patches_(patches.begin(), patches.end(), driver->GetSwapSpaceAllocator()) {
+  if (owns_arrays_) {
+    if (src_mapping_table == nullptr) {
+      src_mapping_table_ = new SwapSrcMap(driver->GetSwapSpaceAllocator());
+    } else {
+      src_mapping_table->Arrange();
+      src_mapping_table_ = new SwapSrcMap(src_mapping_table->begin(), src_mapping_table->end(),
+                                          driver->GetSwapSpaceAllocator());
+    }
+    mapping_table_ = mapping_table.empty() ?
+        nullptr : new SwapVector<uint8_t>(mapping_table.begin(), mapping_table.end(),
+                                          driver->GetSwapSpaceAllocator());
+    vmap_table_ = new SwapVector<uint8_t>(vmap_table.begin(), vmap_table.end(),
+                                          driver->GetSwapSpaceAllocator());
+    gc_map_ = native_gc_map.empty() ? nullptr :
+        new SwapVector<uint8_t>(native_gc_map.begin(), native_gc_map.end(),
+                                driver->GetSwapSpaceAllocator());
+    cfi_info_ = cfi_info.empty() ? nullptr :
+        new SwapVector<uint8_t>(cfi_info.begin(), cfi_info.end(), driver->GetSwapSpaceAllocator());
+  } else {
+    src_mapping_table_ = src_mapping_table == nullptr ?
+        driver->DeduplicateSrcMappingTable(ArrayRef<SrcMapElem>()) :
+        driver->DeduplicateSrcMappingTable(ArrayRef<SrcMapElem>(src_mapping_table->Arrange()));
+    mapping_table_ = mapping_table.empty() ?
+        nullptr : driver->DeduplicateMappingTable(mapping_table);
+    vmap_table_ = driver->DeduplicateVMapTable(vmap_table);
+    gc_map_ = native_gc_map.empty() ? nullptr : driver->DeduplicateGCMap(native_gc_map);
+    cfi_info_ = cfi_info.empty() ? nullptr : driver->DeduplicateCFIInfo(cfi_info);
+  }
 }
 
 CompiledMethod* CompiledMethod::SwapAllocCompiledMethod(
@@ -194,4 +229,14 @@ void CompiledMethod::ReleaseSwapAllocatedCompiledMethod(CompilerDriver* driver,
   alloc.deallocate(m, 1);
 }
 
+CompiledMethod::~CompiledMethod() {
+  if (owns_arrays_) {
+    delete src_mapping_table_;
+    delete mapping_table_;
+    delete vmap_table_;
+    delete gc_map_;
+    delete cfi_info_;
+  }
+}
+
 }  // namespace art
diff --git a/compiler/compiled_method.h b/compiler/compiled_method.h
index 6013507..d6a07f6 100644
--- a/compiler/compiled_method.h
+++ b/compiler/compiled_method.h
@@ -27,10 +27,6 @@
 #include "utils/array_ref.h"
 #include "utils/swap_space.h"
 
-namespace llvm {
-  class Function;
-}  // namespace llvm
-
 namespace art {
 
 class CompilerDriver;
@@ -39,7 +35,9 @@ class CompiledCode {
  public:
   // For Quick to supply an code blob
   CompiledCode(CompilerDriver* compiler_driver, InstructionSet instruction_set,
-               const ArrayRef<const uint8_t>& quick_code);
+               const ArrayRef<const uint8_t>& quick_code, bool owns_code_array);
+
+  virtual ~CompiledCode();
 
   InstructionSet GetInstructionSet() const {
     return instruction_set_;
@@ -56,8 +54,8 @@ class CompiledCode {
   // To align an offset from a page-aligned value to make it suitable
   // for code storage. For example on ARM, to ensure that PC relative
   // valu computations work out as expected.
-  uint32_t AlignCode(uint32_t offset) const;
-  static uint32_t AlignCode(uint32_t offset, InstructionSet instruction_set);
+  size_t AlignCode(size_t offset) const;
+  static size_t AlignCode(size_t offset, InstructionSet instruction_set);
 
   // returns the difference between the code address and a usable PC.
   // mainly to cope with kThumb2 where the lower bit must be set.
@@ -78,6 +76,9 @@ class CompiledCode {
 
   const InstructionSet instruction_set_;
 
+  // If we own the code array (means that we free in destructor).
+  const bool owns_code_array_;
+
   // Used to store the PIC code for Quick.
   SwapVector<uint8_t>* quick_code_;
 
@@ -122,6 +123,7 @@ class SrcMap FINAL : public std::vector<SrcMapElem, Allocator> {
   using std::vector<SrcMapElem, Allocator>::size;
 
   explicit SrcMap() {}
+  explicit SrcMap(const Allocator& alloc) : std::vector<SrcMapElem, Allocator>(alloc) {}
 
   template <class InputIt>
   SrcMap(InputIt first, InputIt last, const Allocator& alloc)
@@ -291,7 +293,7 @@ class CompiledMethod FINAL : public CompiledCode {
                  const ArrayRef<const uint8_t>& cfi_info,
                  const ArrayRef<LinkerPatch>& patches = ArrayRef<LinkerPatch>());
 
-  ~CompiledMethod() {}
+  virtual ~CompiledMethod();
 
   static CompiledMethod* SwapAllocCompiledMethod(
       CompilerDriver* driver,
@@ -347,9 +349,9 @@ class CompiledMethod FINAL : public CompiledCode {
     return mapping_table_;
   }
 
-  const SwapVector<uint8_t>& GetVmapTable() const {
+  const SwapVector<uint8_t>* GetVmapTable() const {
     DCHECK(vmap_table_ != nullptr);
-    return *vmap_table_;
+    return vmap_table_;
   }
 
   SwapVector<uint8_t> const* GetGcMap() const {
@@ -365,6 +367,8 @@ class CompiledMethod FINAL : public CompiledCode {
   }
 
  private:
+  // Whether or not the arrays are owned by the compiled method or dedupe sets.
+  const bool owns_arrays_;
   // For quick code, the size of the activation used by the code.
   const size_t frame_size_in_bytes_;
   // For quick code, a bit mask describing spilled GPR callee-save registers.
diff --git a/compiler/dex/global_value_numbering_test.cc b/compiler/dex/global_value_numbering_test.cc
index 54e34ea..b91c3ca 100644
--- a/compiler/dex/global_value_numbering_test.cc
+++ b/compiler/dex/global_value_numbering_test.cc
@@ -142,7 +142,7 @@ class GlobalValueNumberingTest : public testing::Test {
     cu_.mir_graph->ifield_lowering_infos_.reserve(count);
     for (size_t i = 0u; i != count; ++i) {
       const IFieldDef* def = &defs[i];
-      MirIFieldLoweringInfo field_info(def->field_idx, def->type);
+      MirIFieldLoweringInfo field_info(def->field_idx, def->type, false);
       if (def->declaring_dex_file != 0u) {
         field_info.declaring_dex_file_ = reinterpret_cast<const DexFile*>(def->declaring_dex_file);
         field_info.declaring_field_idx_ = def->declaring_field_idx;
diff --git a/compiler/dex/gvn_dead_code_elimination_test.cc b/compiler/dex/gvn_dead_code_elimination_test.cc
index 954e9f1..4d2b8b3 100644
--- a/compiler/dex/gvn_dead_code_elimination_test.cc
+++ b/compiler/dex/gvn_dead_code_elimination_test.cc
@@ -143,7 +143,7 @@ class GvnDeadCodeEliminationTest : public testing::Test {
     cu_.mir_graph->ifield_lowering_infos_.reserve(count);
     for (size_t i = 0u; i != count; ++i) {
       const IFieldDef* def = &defs[i];
-      MirIFieldLoweringInfo field_info(def->field_idx, def->type);
+      MirIFieldLoweringInfo field_info(def->field_idx, def->type, false);
       if (def->declaring_dex_file != 0u) {
         field_info.declaring_dex_file_ = reinterpret_cast<const DexFile*>(def->declaring_dex_file);
         field_info.declaring_field_idx_ = def->declaring_field_idx;
diff --git a/compiler/dex/local_value_numbering.h b/compiler/dex/local_value_numbering.h
index 97ea05a..379c952 100644
--- a/compiler/dex/local_value_numbering.h
+++ b/compiler/dex/local_value_numbering.h
@@ -21,8 +21,8 @@
 
 #include "base/arena_object.h"
 #include "base/logging.h"
+#include "dex_instruction_utils.h"
 #include "global_value_numbering.h"
-#include "utils/dex_instruction_utils.h"
 
 namespace art {
 
diff --git a/compiler/dex/local_value_numbering_test.cc b/compiler/dex/local_value_numbering_test.cc
index d1c3a6b..566527a 100644
--- a/compiler/dex/local_value_numbering_test.cc
+++ b/compiler/dex/local_value_numbering_test.cc
@@ -96,7 +96,7 @@ class LocalValueNumberingTest : public testing::Test {
     cu_.mir_graph->ifield_lowering_infos_.reserve(count);
     for (size_t i = 0u; i != count; ++i) {
       const IFieldDef* def = &defs[i];
-      MirIFieldLoweringInfo field_info(def->field_idx, def->type);
+      MirIFieldLoweringInfo field_info(def->field_idx, def->type, false);
       if (def->declaring_dex_file != 0u) {
         field_info.declaring_dex_file_ = reinterpret_cast<const DexFile*>(def->declaring_dex_file);
         field_info.declaring_field_idx_ = def->declaring_field_idx;
diff --git a/compiler/dex/mir_analysis.cc b/compiler/dex/mir_analysis.cc
index 31dbc60..a89b250 100644
--- a/compiler/dex/mir_analysis.cc
+++ b/compiler/dex/mir_analysis.cc
@@ -416,8 +416,8 @@ static const uint16_t kAnalysisAttributes[kMirOpLast] = {
   // 72 INVOKE_INTERFACE {vD, vE, vF, vG, vA}
   kAnInvoke | kAnHeavyWeight,
 
-  // 73 UNUSED_73
-  kAnNone,
+  // 73 RETURN_VOID_BARRIER
+  kAnBranch,
 
   // 74 INVOKE_VIRTUAL_RANGE {vCCCC .. vNNNN}
   kAnInvoke | kAnHeavyWeight,
@@ -752,88 +752,88 @@ static const uint16_t kAnalysisAttributes[kMirOpLast] = {
   // E2 USHR_INT_LIT8 vAA, vBB, #+CC
   kAnMath | kAnInt,
 
-  // E3 IGET_VOLATILE
+  // E3 IGET_QUICK
   kAnNone,
 
-  // E4 IPUT_VOLATILE
+  // E4 IGET_WIDE_QUICK
   kAnNone,
 
-  // E5 SGET_VOLATILE
+  // E5 IGET_OBJECT_QUICK
   kAnNone,
 
-  // E6 SPUT_VOLATILE
+  // E6 IPUT_QUICK
   kAnNone,
 
-  // E7 IGET_OBJECT_VOLATILE
+  // E7 IPUT_WIDE_QUICK
   kAnNone,
 
-  // E8 IGET_WIDE_VOLATILE
+  // E8 IPUT_OBJECT_QUICK
   kAnNone,
 
-  // E9 IPUT_WIDE_VOLATILE
-  kAnNone,
+  // E9 INVOKE_VIRTUAL_QUICK
+  kAnInvoke | kAnHeavyWeight,
 
-  // EA SGET_WIDE_VOLATILE
-  kAnNone,
+  // EA INVOKE_VIRTUAL_RANGE_QUICK
+  kAnInvoke | kAnHeavyWeight,
 
-  // EB SPUT_WIDE_VOLATILE
+  // EB IPUT_BOOLEAN_QUICK
   kAnNone,
 
-  // EC BREAKPOINT
+  // EC IPUT_BYTE_QUICK
   kAnNone,
 
-  // ED THROW_VERIFICATION_ERROR
-  kAnHeavyWeight | kAnBranch,
+  // ED IPUT_CHAR_QUICK
+  kAnNone,
 
-  // EE EXECUTE_INLINE
+  // EE IPUT_SHORT_QUICK
   kAnNone,
 
-  // EF EXECUTE_INLINE_RANGE
+  // EF IGET_BOOLEAN_QUICK
   kAnNone,
 
-  // F0 INVOKE_OBJECT_INIT_RANGE
-  kAnInvoke | kAnHeavyWeight,
+  // F0 IGET_BYTE_QUICK
+  kAnNone,
 
-  // F1 RETURN_VOID_BARRIER
-  kAnBranch,
+  // F1 IGET_CHAR_QUICK
+  kAnNone,
 
-  // F2 IGET_QUICK
+  // F2 IGET_SHORT_QUICK
   kAnNone,
 
-  // F3 IGET_WIDE_QUICK
+  // F3 UNUSED_F3
   kAnNone,
 
-  // F4 IGET_OBJECT_QUICK
+  // F4 UNUSED_F4
   kAnNone,
 
-  // F5 IPUT_QUICK
+  // F5 UNUSED_F5
   kAnNone,
 
-  // F6 IPUT_WIDE_QUICK
+  // F6 UNUSED_F6
   kAnNone,
 
-  // F7 IPUT_OBJECT_QUICK
+  // F7 UNUSED_F7
   kAnNone,
 
-  // F8 INVOKE_VIRTUAL_QUICK
-  kAnInvoke | kAnHeavyWeight,
+  // F8 UNUSED_F8
+  kAnNone,
 
-  // F9 INVOKE_VIRTUAL_QUICK_RANGE
-  kAnInvoke | kAnHeavyWeight,
+  // F9 UNUSED_F9
+  kAnNone,
 
-  // FA INVOKE_SUPER_QUICK
-  kAnInvoke | kAnHeavyWeight,
+  // FA UNUSED_FA
+  kAnNone,
 
-  // FB INVOKE_SUPER_QUICK_RANGE
-  kAnInvoke | kAnHeavyWeight,
+  // FB UNUSED_FB
+  kAnNone,
 
-  // FC IPUT_OBJECT_VOLATILE
+  // FC UNUSED_FC
   kAnNone,
 
-  // FD SGET_OBJECT_VOLATILE
+  // FD UNUSED_FD
   kAnNone,
 
-  // FE SPUT_OBJECT_VOLATILE
+  // FE UNUSED_FE
   kAnNone,
 
   // FF UNUSED_FF
@@ -1203,12 +1203,13 @@ bool MIRGraph::SkipCompilation(std::string* skip_message) {
 }
 
 void MIRGraph::DoCacheFieldLoweringInfo() {
+  static constexpr uint32_t kFieldIndexFlagQuickened = 0x80000000;
   // All IGET/IPUT/SGET/SPUT instructions take 2 code units and there must also be a RETURN.
   const uint32_t max_refs = (GetNumDalvikInsns() - 1u) / 2u;
   ScopedArenaAllocator allocator(&cu_->arena_stack);
-  uint16_t* field_idxs = allocator.AllocArray<uint16_t>(max_refs, kArenaAllocMisc);
-  DexMemAccessType* field_types = allocator.AllocArray<DexMemAccessType>(max_refs, kArenaAllocMisc);
-
+  auto* field_idxs = allocator.AllocArray<uint32_t>(max_refs, kArenaAllocMisc);
+  DexMemAccessType* field_types = allocator.AllocArray<DexMemAccessType>(
+      max_refs, kArenaAllocMisc);
   // Find IGET/IPUT/SGET/SPUT insns, store IGET/IPUT fields at the beginning, SGET/SPUT at the end.
   size_t ifield_pos = 0u;
   size_t sfield_pos = max_refs;
@@ -1221,23 +1222,36 @@ void MIRGraph::DoCacheFieldLoweringInfo() {
       // Get field index and try to find it among existing indexes. If found, it's usually among
       // the last few added, so we'll start the search from ifield_pos/sfield_pos. Though this
       // is a linear search, it actually performs much better than map based approach.
-      if (IsInstructionIGetOrIPut(mir->dalvikInsn.opcode)) {
-        uint16_t field_idx = mir->dalvikInsn.vC;
+      const bool is_iget_or_iput = IsInstructionIGetOrIPut(mir->dalvikInsn.opcode);
+      const bool is_iget_or_iput_quick = IsInstructionIGetQuickOrIPutQuick(mir->dalvikInsn.opcode);
+      if (is_iget_or_iput || is_iget_or_iput_quick) {
+        uint32_t field_idx;
+        DexMemAccessType access_type;
+        if (is_iget_or_iput) {
+          field_idx = mir->dalvikInsn.vC;
+          access_type = IGetOrIPutMemAccessType(mir->dalvikInsn.opcode);
+        } else {
+          DCHECK(is_iget_or_iput_quick);
+          // Set kFieldIndexFlagQuickened so that we don't deduplicate against non quickened field
+          // indexes.
+          field_idx = mir->offset | kFieldIndexFlagQuickened;
+          access_type = IGetQuickOrIPutQuickMemAccessType(mir->dalvikInsn.opcode);
+        }
         size_t i = ifield_pos;
         while (i != 0u && field_idxs[i - 1] != field_idx) {
           --i;
         }
         if (i != 0u) {
           mir->meta.ifield_lowering_info = i - 1;
-          DCHECK_EQ(field_types[i - 1], IGetOrIPutMemAccessType(mir->dalvikInsn.opcode));
+          DCHECK_EQ(field_types[i - 1], access_type);
         } else {
           mir->meta.ifield_lowering_info = ifield_pos;
           field_idxs[ifield_pos] = field_idx;
-          field_types[ifield_pos] = IGetOrIPutMemAccessType(mir->dalvikInsn.opcode);
+          field_types[ifield_pos] = access_type;
           ++ifield_pos;
         }
       } else if (IsInstructionSGetOrSPut(mir->dalvikInsn.opcode)) {
-        uint16_t field_idx = mir->dalvikInsn.vB;
+        auto field_idx = mir->dalvikInsn.vB;
         size_t i = sfield_pos;
         while (i != max_refs && field_idxs[i] != field_idx) {
           ++i;
@@ -1261,7 +1275,12 @@ void MIRGraph::DoCacheFieldLoweringInfo() {
     DCHECK_EQ(ifield_lowering_infos_.size(), 0u);
     ifield_lowering_infos_.reserve(ifield_pos);
     for (size_t pos = 0u; pos != ifield_pos; ++pos) {
-      ifield_lowering_infos_.push_back(MirIFieldLoweringInfo(field_idxs[pos], field_types[pos]));
+      const uint32_t field_idx = field_idxs[pos];
+      const bool is_quickened = (field_idx & kFieldIndexFlagQuickened) != 0;
+      const uint32_t masked_field_idx = field_idx & ~kFieldIndexFlagQuickened;
+      CHECK_LT(masked_field_idx, 1u << 16);
+      ifield_lowering_infos_.push_back(
+          MirIFieldLoweringInfo(masked_field_idx, field_types[pos], is_quickened));
     }
     MirIFieldLoweringInfo::Resolve(cu_->compiler_driver, GetCurrentDexCompilationUnit(),
                                    ifield_lowering_infos_.data(), ifield_pos);
@@ -1282,18 +1301,19 @@ void MIRGraph::DoCacheFieldLoweringInfo() {
 
 void MIRGraph::DoCacheMethodLoweringInfo() {
   static constexpr uint16_t invoke_types[] = { kVirtual, kSuper, kDirect, kStatic, kInterface };
+  static constexpr uint32_t kMethodIdxFlagQuickened = 0x80000000;
 
   // Embed the map value in the entry to avoid extra padding in 64-bit builds.
   struct MapEntry {
     // Map key: target_method_idx, invoke_type, devirt_target. Ordered to avoid padding.
     const MethodReference* devirt_target;
-    uint16_t target_method_idx;
+    uint32_t target_method_idx;
+    uint32_t vtable_idx;
     uint16_t invoke_type;
     // Map value.
     uint32_t lowering_info_index;
   };
 
-  // Sort INVOKEs by method index, then by opcode, then by devirtualization target.
   struct MapEntryComparator {
     bool operator()(const MapEntry& lhs, const MapEntry& rhs) const {
       if (lhs.target_method_idx != rhs.target_method_idx) {
@@ -1302,6 +1322,9 @@ void MIRGraph::DoCacheMethodLoweringInfo() {
       if (lhs.invoke_type != rhs.invoke_type) {
         return lhs.invoke_type < rhs.invoke_type;
       }
+      if (lhs.vtable_idx != rhs.vtable_idx) {
+        return lhs.vtable_idx < rhs.vtable_idx;
+      }
       if (lhs.devirt_target != rhs.devirt_target) {
         if (lhs.devirt_target == nullptr) {
           return true;
@@ -1319,7 +1342,7 @@ void MIRGraph::DoCacheMethodLoweringInfo() {
   ScopedArenaAllocator allocator(&cu_->arena_stack);
 
   // All INVOKE instructions take 3 code units and there must also be a RETURN.
-  uint32_t max_refs = (GetNumDalvikInsns() - 1u) / 3u;
+  const uint32_t max_refs = (GetNumDalvikInsns() - 1u) / 3u;
 
   // Map invoke key (see MapEntry) to lowering info index and vice versa.
   // The invoke_map and sequential entries are essentially equivalent to Boost.MultiIndex's
@@ -1330,28 +1353,43 @@ void MIRGraph::DoCacheMethodLoweringInfo() {
       allocator.AllocArray<const MapEntry*>(max_refs, kArenaAllocMisc);
 
   // Find INVOKE insns and their devirtualization targets.
+  const VerifiedMethod* verified_method = GetCurrentDexCompilationUnit()->GetVerifiedMethod();
   AllNodesIterator iter(this);
   for (BasicBlock* bb = iter.Next(); bb != nullptr; bb = iter.Next()) {
     if (bb->block_type != kDalvikByteCode) {
       continue;
     }
     for (MIR* mir = bb->first_mir_insn; mir != nullptr; mir = mir->next) {
-      if (IsInstructionInvoke(mir->dalvikInsn.opcode)) {
-        // Decode target method index and invoke type.
-        uint16_t target_method_idx = mir->dalvikInsn.vB;
-        DexInvokeType invoke_type_idx = InvokeInstructionType(mir->dalvikInsn.opcode);
-
+      const bool is_quick_invoke = IsInstructionQuickInvoke(mir->dalvikInsn.opcode);
+      const bool is_invoke = IsInstructionInvoke(mir->dalvikInsn.opcode);
+      if (is_quick_invoke || is_invoke) {
+        uint32_t vtable_index = 0;
+        uint32_t target_method_idx = 0;
+        uint32_t invoke_type_idx = 0;  // Default to virtual (in case of quickened).
+        DCHECK_EQ(invoke_types[invoke_type_idx], kVirtual);
+        if (is_quick_invoke) {
+          // We need to store the vtable index since we can't necessarily recreate it at resolve
+          // phase if the dequickening resolved to an interface method.
+          vtable_index = mir->dalvikInsn.vB;
+          // Fake up the method index by storing the mir offset so that we can read the dequicken
+          // info in resolve.
+          target_method_idx = mir->offset | kMethodIdxFlagQuickened;
+        } else {
+          DCHECK(is_invoke);
+          // Decode target method index and invoke type.
+          invoke_type_idx = InvokeInstructionType(mir->dalvikInsn.opcode);
+          target_method_idx = mir->dalvikInsn.vB;
+        }
         // Find devirtualization target.
         // TODO: The devirt map is ordered by the dex pc here. Is there a way to get INVOKEs
         // ordered by dex pc as well? That would allow us to keep an iterator to devirt targets
         // and increment it as needed instead of making O(log n) lookups.
-        const VerifiedMethod* verified_method = GetCurrentDexCompilationUnit()->GetVerifiedMethod();
         const MethodReference* devirt_target = verified_method->GetDevirtTarget(mir->offset);
-
         // Try to insert a new entry. If the insertion fails, we will have found an old one.
         MapEntry entry = {
             devirt_target,
             target_method_idx,
+            vtable_index,
             invoke_types[invoke_type_idx],
             static_cast<uint32_t>(invoke_map.size())
         };
@@ -1362,22 +1400,24 @@ void MIRGraph::DoCacheMethodLoweringInfo() {
       }
     }
   }
-
   if (invoke_map.empty()) {
     return;
   }
-
   // Prepare unique method infos, set method info indexes for their MIRs.
-  DCHECK_EQ(method_lowering_infos_.size(), 0u);
   const size_t count = invoke_map.size();
   method_lowering_infos_.reserve(count);
   for (size_t pos = 0u; pos != count; ++pos) {
     const MapEntry* entry = sequential_entries[pos];
-    MirMethodLoweringInfo method_info(entry->target_method_idx,
-                                      static_cast<InvokeType>(entry->invoke_type));
+    const bool is_quick = (entry->target_method_idx & kMethodIdxFlagQuickened) != 0;
+    const uint32_t masked_method_idx = entry->target_method_idx & ~kMethodIdxFlagQuickened;
+    MirMethodLoweringInfo method_info(masked_method_idx,
+                                      static_cast<InvokeType>(entry->invoke_type), is_quick);
     if (entry->devirt_target != nullptr) {
       method_info.SetDevirtualizationTarget(*entry->devirt_target);
     }
+    if (is_quick) {
+      method_info.SetVTableIndex(entry->vtable_idx);
+    }
     method_lowering_infos_.push_back(method_info);
   }
   MirMethodLoweringInfo::Resolve(cu_->compiler_driver, GetCurrentDexCompilationUnit(),
diff --git a/compiler/dex/mir_dataflow.cc b/compiler/dex/mir_dataflow.cc
index f9f7e22..dfaff6c 100644
--- a/compiler/dex/mir_dataflow.cc
+++ b/compiler/dex/mir_dataflow.cc
@@ -374,7 +374,7 @@ const uint64_t MIRGraph::oat_data_flow_attributes_[kMirOpLast] = {
   // 72 INVOKE_INTERFACE {vD, vE, vF, vG, vA}
   DF_FORMAT_35C | DF_NULL_CHK_OUT0 | DF_UMS,
 
-  // 73 UNUSED_73
+  // 73 RETURN_VOID_BARRIER
   DF_NOP,
 
   // 74 INVOKE_VIRTUAL_RANGE {vCCCC .. vNNNN}
@@ -710,89 +710,89 @@ const uint64_t MIRGraph::oat_data_flow_attributes_[kMirOpLast] = {
   // E2 USHR_INT_LIT8 vAA, vBB, #+CC
   DF_DA | DF_UB | DF_CORE_A | DF_CORE_B,
 
-  // E3 IGET_VOLATILE
+  // E3 IGET_QUICK
   DF_DA | DF_UB | DF_NULL_CHK_B | DF_REF_B | DF_IFIELD | DF_LVN,
 
-  // E4 IPUT_VOLATILE
-  DF_UA | DF_UB | DF_NULL_CHK_B | DF_REF_B | DF_IFIELD | DF_LVN,
-
-  // E5 SGET_VOLATILE
-  DF_DA | DF_SFIELD | DF_CLINIT | DF_UMS,
-
-  // E6 SPUT_VOLATILE
-  DF_UA | DF_SFIELD | DF_CLINIT | DF_UMS,
+  // E4 IGET_WIDE_QUICK
+  DF_DA | DF_A_WIDE | DF_UB | DF_NULL_CHK_B | DF_REF_B | DF_IFIELD | DF_LVN,
 
-  // E7 IGET_OBJECT_VOLATILE
+  // E5 IGET_OBJECT_QUICK
   DF_DA | DF_UB | DF_NULL_CHK_B | DF_REF_A | DF_REF_B | DF_IFIELD | DF_LVN,
 
-  // E8 IGET_WIDE_VOLATILE
-  DF_DA | DF_A_WIDE | DF_UB | DF_NULL_CHK_B | DF_REF_B | DF_IFIELD | DF_LVN,
+  // E6 IPUT_QUICK
+  DF_UA | DF_UB | DF_NULL_CHK_B | DF_REF_B | DF_IFIELD | DF_LVN,
 
-  // E9 IPUT_WIDE_VOLATILE
+  // E7 IPUT_WIDE_QUICK
   DF_UA | DF_A_WIDE | DF_UB | DF_NULL_CHK_B | DF_REF_B | DF_IFIELD | DF_LVN,
 
-  // EA SGET_WIDE_VOLATILE
-  DF_DA | DF_A_WIDE | DF_SFIELD | DF_CLINIT | DF_UMS,
+  // E8 IPUT_OBJECT_QUICK
+  DF_UA | DF_UB | DF_NULL_CHK_B | DF_REF_A | DF_REF_B | DF_IFIELD | DF_LVN,
 
-  // EB SPUT_WIDE_VOLATILE
-  DF_UA | DF_A_WIDE | DF_SFIELD | DF_CLINIT | DF_UMS,
+  // E9 INVOKE_VIRTUAL_QUICK
+  DF_FORMAT_35C | DF_NULL_CHK_OUT0 | DF_UMS,
 
-  // EC BREAKPOINT
-  DF_NOP,
+  // EA INVOKE_VIRTUAL_RANGE_QUICK
+  DF_FORMAT_3RC | DF_NULL_CHK_OUT0 | DF_UMS,
 
-  // ED THROW_VERIFICATION_ERROR
-  DF_NOP | DF_UMS,
+  // EB IPUT_BOOLEAN_QUICK vA, vB, index
+  DF_UA | DF_UB | DF_NULL_CHK_B | DF_REF_B | DF_IFIELD | DF_LVN,
 
-  // EE EXECUTE_INLINE
-  DF_FORMAT_35C,
+  // EC IPUT_BYTE_QUICK vA, vB, index
+  DF_UA | DF_UB | DF_NULL_CHK_B | DF_REF_B | DF_IFIELD | DF_LVN,
 
-  // EF EXECUTE_INLINE_RANGE
-  DF_FORMAT_3RC,
+  // ED IPUT_CHAR_QUICK vA, vB, index
+  DF_UA | DF_UB | DF_NULL_CHK_B | DF_REF_B | DF_IFIELD | DF_LVN,
 
-  // F0 INVOKE_OBJECT_INIT_RANGE
-  DF_NOP,
+  // EE IPUT_SHORT_QUICK vA, vB, index
+  DF_UA | DF_UB | DF_NULL_CHK_B | DF_REF_B | DF_IFIELD | DF_LVN,
 
-  // F1 RETURN_VOID_BARRIER
-  DF_NOP,
+  // EF IGET_BOOLEAN_QUICK vA, vB, index
+  DF_DA | DF_UB | DF_NULL_CHK_B | DF_REF_B | DF_IFIELD | DF_LVN,
 
-  // F2 IGET_QUICK
-  DF_DA | DF_UB | DF_NULL_CHK_B | DF_IFIELD | DF_LVN,
+  // F0 IGET_BYTE_QUICK vA, vB, index
+  DF_DA | DF_UB | DF_NULL_CHK_B | DF_REF_B | DF_IFIELD | DF_LVN,
 
-  // F3 IGET_WIDE_QUICK
-  DF_DA | DF_A_WIDE | DF_UB | DF_NULL_CHK_B | DF_IFIELD | DF_LVN,
+  // F1 IGET_CHAR_QUICK vA, vB, index
+  DF_DA | DF_UB | DF_NULL_CHK_B | DF_REF_B | DF_IFIELD | DF_LVN,
 
-  // F4 IGET_OBJECT_QUICK
-  DF_DA | DF_UB | DF_NULL_CHK_B | DF_IFIELD | DF_LVN,
+  // F2 IGET_SHORT_QUICK vA, vB, index
+  DF_DA | DF_UB | DF_NULL_CHK_B | DF_REF_B | DF_IFIELD | DF_LVN,
 
-  // F5 IPUT_QUICK
-  DF_UA | DF_UB | DF_NULL_CHK_B | DF_IFIELD | DF_LVN,
+  // F3 UNUSED_F3
+  DF_NOP,
 
-  // F6 IPUT_WIDE_QUICK
-  DF_UA | DF_A_WIDE | DF_UB | DF_NULL_CHK_B | DF_IFIELD | DF_LVN,
+  // F4 UNUSED_F4
+  DF_NOP,
 
-  // F7 IPUT_OBJECT_QUICK
-  DF_UA | DF_UB | DF_NULL_CHK_B | DF_IFIELD | DF_LVN,
+  // F5 UNUSED_F5
+  DF_NOP,
 
-  // F8 INVOKE_VIRTUAL_QUICK
-  DF_FORMAT_35C | DF_NULL_CHK_OUT0 | DF_UMS,
+  // F6 UNUSED_F6
+  DF_NOP,
 
-  // F9 INVOKE_VIRTUAL_QUICK_RANGE
-  DF_FORMAT_3RC | DF_NULL_CHK_OUT0 | DF_UMS,
+  // F7 UNUSED_F7
+  DF_NOP,
 
-  // FA INVOKE_SUPER_QUICK
-  DF_FORMAT_35C | DF_NULL_CHK_OUT0 | DF_UMS,
+  // F8 UNUSED_F8
+  DF_NOP,
 
-  // FB INVOKE_SUPER_QUICK_RANGE
-  DF_FORMAT_3RC | DF_NULL_CHK_OUT0 | DF_UMS,
+  // F9 UNUSED_F9
+  DF_NOP,
 
-  // FC IPUT_OBJECT_VOLATILE
-  DF_UA | DF_UB | DF_NULL_CHK_B | DF_REF_A | DF_REF_B | DF_IFIELD | DF_LVN,
+  // FA UNUSED_FA
+  DF_NOP,
 
-  // FD SGET_OBJECT_VOLATILE
-  DF_DA | DF_REF_A | DF_SFIELD | DF_CLINIT | DF_UMS,
+  // FB UNUSED_FB
+  DF_NOP,
 
-  // FE SPUT_OBJECT_VOLATILE
-  DF_UA | DF_REF_A | DF_SFIELD | DF_CLINIT | DF_UMS,
+  // FC UNUSED_FC
+  DF_NOP,
+
+  // FD UNUSED_FD
+  DF_NOP,
+
+  // FE UNUSED_FE
+  DF_NOP,
 
   // FF UNUSED_FF
   DF_NOP,
diff --git a/compiler/dex/mir_field_info.cc b/compiler/dex/mir_field_info.cc
index 53afcad..d2079a2 100644
--- a/compiler/dex/mir_field_info.cc
+++ b/compiler/dex/mir_field_info.cc
@@ -35,8 +35,9 @@ void MirIFieldLoweringInfo::Resolve(CompilerDriver* compiler_driver,
     DCHECK(field_infos != nullptr);
     DCHECK_NE(count, 0u);
     for (auto it = field_infos, end = field_infos + count; it != end; ++it) {
-      MirIFieldLoweringInfo unresolved(it->field_idx_, it->MemAccessType());
-      DCHECK_EQ(memcmp(&unresolved, &*it, sizeof(*it)), 0);
+      MirIFieldLoweringInfo unresolved(it->field_idx_, it->MemAccessType(), it->IsQuickened());
+      unresolved.field_offset_ = it->field_offset_;
+      unresolved.CheckEquals(*it);
     }
   }
 
@@ -49,13 +50,30 @@ void MirIFieldLoweringInfo::Resolve(CompilerDriver* compiler_driver,
       hs.NewHandle(compiler_driver->GetClassLoader(soa, mUnit)));
   Handle<mirror::Class> referrer_class(hs.NewHandle(
       compiler_driver->ResolveCompilingMethodsClass(soa, dex_cache, class_loader, mUnit)));
+  const VerifiedMethod* const verified_method = mUnit->GetVerifiedMethod();
   // Even if the referrer class is unresolved (i.e. we're compiling a method without class
   // definition) we still want to resolve fields and record all available info.
-
   for (auto it = field_infos, end = field_infos + count; it != end; ++it) {
-    uint32_t field_idx = it->field_idx_;
-    mirror::ArtField* resolved_field =
-        compiler_driver->ResolveField(soa, dex_cache, class_loader, mUnit, field_idx, false);
+    uint32_t field_idx;
+    mirror::ArtField* resolved_field;
+    if (!it->IsQuickened()) {
+      field_idx = it->field_idx_;
+      resolved_field = compiler_driver->ResolveField(soa, dex_cache, class_loader, mUnit,
+                                                     field_idx, false);
+    } else {
+      const auto mir_offset = it->field_idx_;
+      // For quickened instructions, it->field_offset_ actually contains the mir offset.
+      // We need to use the de-quickening info to get dex file / field idx
+      auto* field_idx_ptr = verified_method->GetDequickenIndex(mir_offset);
+      CHECK(field_idx_ptr != nullptr);
+      field_idx = field_idx_ptr->index;
+      StackHandleScope<1> hs2(soa.Self());
+      auto h_dex_cache = hs2.NewHandle(compiler_driver->FindDexCache(field_idx_ptr->dex_file));
+      resolved_field = compiler_driver->ResolveFieldWithDexFile(
+          soa, h_dex_cache, class_loader, field_idx_ptr->dex_file, field_idx, false);
+      // Since we don't have a valid field index we can't go slow path later.
+      CHECK(resolved_field != nullptr);
+    }
     if (UNLIKELY(resolved_field == nullptr)) {
       continue;
     }
diff --git a/compiler/dex/mir_field_info.h b/compiler/dex/mir_field_info.h
index 98b2da8..ca56958 100644
--- a/compiler/dex/mir_field_info.h
+++ b/compiler/dex/mir_field_info.h
@@ -19,8 +19,8 @@
 
 #include "base/macros.h"
 #include "dex_file.h"
+#include "dex_instruction_utils.h"
 #include "offsets.h"
-#include "utils/dex_instruction_utils.h"
 
 namespace art {
 
@@ -39,6 +39,9 @@ class MirFieldInfo {
   uint16_t FieldIndex() const {
     return field_idx_;
   }
+  void SetFieldIndex(uint16_t field_idx) {
+    field_idx_ = field_idx;
+  }
 
   bool IsStatic() const {
     return (flags_ & kFlagIsStatic) != 0u;
@@ -51,6 +54,9 @@ class MirFieldInfo {
   const DexFile* DeclaringDexFile() const {
     return declaring_dex_file_;
   }
+  void SetDeclaringDexFile(const DexFile* dex_file) {
+    declaring_dex_file_ = dex_file;
+  }
 
   uint16_t DeclaringClassIndex() const {
     return declaring_class_idx_;
@@ -64,20 +70,35 @@ class MirFieldInfo {
     return (flags_ & kFlagIsVolatile) != 0u;
   }
 
+  // IGET_QUICK, IGET_BYTE_QUICK, ...
+  bool IsQuickened() const {
+    return (flags_ & kFlagIsQuickened) != 0u;
+  }
+
   DexMemAccessType MemAccessType() const {
     return static_cast<DexMemAccessType>((flags_ >> kBitMemAccessTypeBegin) & kMemAccessTypeMask);
   }
 
+  void CheckEquals(const MirFieldInfo& other) const {
+    CHECK_EQ(field_idx_, other.field_idx_);
+    CHECK_EQ(flags_, other.flags_);
+    CHECK_EQ(declaring_field_idx_, other.declaring_field_idx_);
+    CHECK_EQ(declaring_class_idx_, other.declaring_class_idx_);
+    CHECK_EQ(declaring_dex_file_, other.declaring_dex_file_);
+  }
+
  protected:
   enum {
     kBitIsStatic = 0,
     kBitIsVolatile,
+    kBitIsQuickened,
     kBitMemAccessTypeBegin,
     kBitMemAccessTypeEnd = kBitMemAccessTypeBegin + 3,  // 3 bits for raw type.
     kFieldInfoBitEnd = kBitMemAccessTypeEnd
   };
   static constexpr uint16_t kFlagIsVolatile = 1u << kBitIsVolatile;
   static constexpr uint16_t kFlagIsStatic = 1u << kBitIsStatic;
+  static constexpr uint16_t kFlagIsQuickened = 1u << kBitIsQuickened;
   static constexpr uint16_t kMemAccessTypeMask = 7u;
   static_assert((1u << (kBitMemAccessTypeEnd - kBitMemAccessTypeBegin)) - 1u == kMemAccessTypeMask,
                 "Invalid raw type mask");
@@ -117,8 +138,10 @@ class MirIFieldLoweringInfo : public MirFieldInfo {
       LOCKS_EXCLUDED(Locks::mutator_lock_);
 
   // Construct an unresolved instance field lowering info.
-  explicit MirIFieldLoweringInfo(uint16_t field_idx, DexMemAccessType type)
-      : MirFieldInfo(field_idx, kFlagIsVolatile, type),  // Without kFlagIsStatic.
+  explicit MirIFieldLoweringInfo(uint16_t field_idx, DexMemAccessType type, bool is_quickened)
+      : MirFieldInfo(field_idx,
+                     kFlagIsVolatile | (is_quickened ? kFlagIsQuickened : 0u),
+                     type),  // Without kFlagIsStatic.
         field_offset_(0u) {
   }
 
@@ -134,6 +157,11 @@ class MirIFieldLoweringInfo : public MirFieldInfo {
     return field_offset_;
   }
 
+  void CheckEquals(const MirIFieldLoweringInfo& other) const {
+    MirFieldInfo::CheckEquals(other);
+    CHECK_EQ(field_offset_.Uint32Value(), other.field_offset_.Uint32Value());
+  }
+
  private:
   enum {
     kBitFastGet = kFieldInfoBitEnd,
diff --git a/compiler/dex/mir_graph.cc b/compiler/dex/mir_graph.cc
index 76b5e44..f354a49 100644
--- a/compiler/dex/mir_graph.cc
+++ b/compiler/dex/mir_graph.cc
@@ -1673,12 +1673,6 @@ void MIRGraph::GetBlockName(BasicBlock* bb, char* name) {
   }
 }
 
-const char* MIRGraph::GetShortyFromTargetIdx(int target_idx) {
-  // TODO: for inlining support, use current code unit.
-  const DexFile::MethodId& method_id = cu_->dex_file->GetMethodId(target_idx);
-  return cu_->dex_file->GetShorty(method_id.proto_idx_);
-}
-
 const char* MIRGraph::GetShortyFromMethodReference(const MethodReference& target_method) {
   const DexFile::MethodId& method_id =
       target_method.dex_file->GetMethodId(target_method.dex_method_index);
@@ -1724,8 +1718,7 @@ void MIRGraph::DumpMIRGraph() {
  * high-word loc for wide arguments.  Also pull up any following
  * MOVE_RESULT and incorporate it into the invoke.
  */
-CallInfo* MIRGraph::NewMemCallInfo(BasicBlock* bb, MIR* mir, InvokeType type,
-                                  bool is_range) {
+CallInfo* MIRGraph::NewMemCallInfo(BasicBlock* bb, MIR* mir, InvokeType type, bool is_range) {
   CallInfo* info = static_cast<CallInfo*>(arena_->Alloc(sizeof(CallInfo),
                                                         kArenaAllocMisc));
   MIR* move_result_mir = FindMoveResult(bb, mir);
@@ -1744,6 +1737,13 @@ CallInfo* MIRGraph::NewMemCallInfo(BasicBlock* bb, MIR* mir, InvokeType type,
   info->opt_flags = mir->optimization_flags;
   info->type = type;
   info->is_range = is_range;
+  if (IsInstructionQuickInvoke(mir->dalvikInsn.opcode)) {
+    const auto& method_info = GetMethodLoweringInfo(mir);
+    info->method_ref = method_info.GetTargetMethod();
+  } else {
+    info->method_ref = MethodReference(GetCurrentDexCompilationUnit()->GetDexFile(),
+                                       mir->dalvikInsn.vB);
+  }
   info->index = mir->dalvikInsn.vB;
   info->offset = mir->offset;
   info->mir = mir;
diff --git a/compiler/dex/mir_graph.h b/compiler/dex/mir_graph.h
index e5abd3b..3dae5b4 100644
--- a/compiler/dex/mir_graph.h
+++ b/compiler/dex/mir_graph.h
@@ -504,6 +504,7 @@ struct CallInfo {
   int opt_flags;
   InvokeType type;
   uint32_t dex_idx;
+  MethodReference method_ref;
   uint32_t index;         // Method idx for invokes, type idx for FilledNewArray.
   uintptr_t direct_code;
   uintptr_t direct_method;
@@ -687,7 +688,7 @@ class MIRGraph {
 
   void DoCacheMethodLoweringInfo();
 
-  const MirMethodLoweringInfo& GetMethodLoweringInfo(MIR* mir) {
+  const MirMethodLoweringInfo& GetMethodLoweringInfo(MIR* mir) const {
     DCHECK_LT(mir->meta.method_lowering_info, method_lowering_infos_.size());
     return method_lowering_infos_[mir->meta.method_lowering_info];
   }
@@ -1132,7 +1133,6 @@ class MIRGraph {
   std::string GetSSAName(int ssa_reg);
   std::string GetSSANameWithConst(int ssa_reg, bool singles_only);
   void GetBlockName(BasicBlock* bb, char* name);
-  const char* GetShortyFromTargetIdx(int);
   const char* GetShortyFromMethodReference(const MethodReference& target_method);
   void DumpMIRGraph();
   CallInfo* NewMemCallInfo(BasicBlock* bb, MIR* mir, InvokeType type, bool is_range);
diff --git a/compiler/dex/mir_method_info.cc b/compiler/dex/mir_method_info.cc
index b234950..3d3d979 100644
--- a/compiler/dex/mir_method_info.cc
+++ b/compiler/dex/mir_method_info.cc
@@ -33,51 +33,103 @@ void MirMethodLoweringInfo::Resolve(CompilerDriver* compiler_driver,
     DCHECK(method_infos != nullptr);
     DCHECK_NE(count, 0u);
     for (auto it = method_infos, end = method_infos + count; it != end; ++it) {
-      MirMethodLoweringInfo unresolved(it->MethodIndex(), it->GetInvokeType());
+      MirMethodLoweringInfo unresolved(it->MethodIndex(), it->GetInvokeType(), it->IsQuickened());
+      unresolved.declaring_dex_file_ = it->declaring_dex_file_;
+      unresolved.vtable_idx_ = it->vtable_idx_;
       if (it->target_dex_file_ != nullptr) {
         unresolved.target_dex_file_ = it->target_dex_file_;
         unresolved.target_method_idx_ = it->target_method_idx_;
       }
-      DCHECK_EQ(memcmp(&unresolved, &*it, sizeof(*it)), 0);
+      if (kIsDebugBuild) {
+        unresolved.CheckEquals(*it);
+      }
     }
   }
 
   // We're going to resolve methods and check access in a tight loop. It's better to hold
   // the lock and needed references once than re-acquiring them again and again.
   ScopedObjectAccess soa(Thread::Current());
-  StackHandleScope<3> hs(soa.Self());
+  StackHandleScope<4> hs(soa.Self());
   Handle<mirror::DexCache> dex_cache(hs.NewHandle(compiler_driver->GetDexCache(mUnit)));
   Handle<mirror::ClassLoader> class_loader(
       hs.NewHandle(compiler_driver->GetClassLoader(soa, mUnit)));
   Handle<mirror::Class> referrer_class(hs.NewHandle(
       compiler_driver->ResolveCompilingMethodsClass(soa, dex_cache, class_loader, mUnit)));
+  auto current_dex_cache(hs.NewHandle<mirror::DexCache>(nullptr));
   // Even if the referrer class is unresolved (i.e. we're compiling a method without class
   // definition) we still want to resolve methods and record all available info.
+  const DexFile* const dex_file = mUnit->GetDexFile();
+  const bool use_jit = Runtime::Current()->UseJit();
+  const VerifiedMethod* const verified_method = mUnit->GetVerifiedMethod();
 
   for (auto it = method_infos, end = method_infos + count; it != end; ++it) {
+    // For quickened invokes, the dex method idx is actually the mir offset.
+    if (it->IsQuickened()) {
+      const auto* dequicken_ref = verified_method->GetDequickenIndex(it->method_idx_);
+      CHECK(dequicken_ref != nullptr);
+      it->target_dex_file_ = dequicken_ref->dex_file;
+      it->target_method_idx_ = dequicken_ref->index;
+    }
     // Remember devirtualized invoke target and set the called method to the default.
     MethodReference devirt_ref(it->target_dex_file_, it->target_method_idx_);
     MethodReference* devirt_target = (it->target_dex_file_ != nullptr) ? &devirt_ref : nullptr;
-    it->target_dex_file_ = mUnit->GetDexFile();
-    it->target_method_idx_ = it->MethodIndex();
-
     InvokeType invoke_type = it->GetInvokeType();
-    mirror::ArtMethod* resolved_method =
-        compiler_driver->ResolveMethod(soa, dex_cache, class_loader, mUnit, it->MethodIndex(),
-                                       invoke_type);
+    mirror::ArtMethod* resolved_method = nullptr;
+    if (!it->IsQuickened()) {
+      it->target_dex_file_ = dex_file;
+      it->target_method_idx_ = it->MethodIndex();
+      current_dex_cache.Assign(dex_cache.Get());
+      resolved_method = compiler_driver->ResolveMethod(soa, dex_cache, class_loader, mUnit,
+                                                       it->MethodIndex(), invoke_type);
+    } else {
+      // The method index is actually the dex PC in this case.
+      // Calculate the proper dex file and target method idx.
+      CHECK(use_jit);
+      CHECK_EQ(invoke_type, kVirtual);
+      // Don't devirt if we are in a different dex file since we can't have direct invokes in
+      // another dex file unless we always put a direct / patch pointer.
+      devirt_target = nullptr;
+      current_dex_cache.Assign(
+          Runtime::Current()->GetClassLinker()->FindDexCache(*it->target_dex_file_));
+      CHECK(current_dex_cache.Get() != nullptr);
+      DexCompilationUnit cu(
+          mUnit->GetCompilationUnit(), mUnit->GetClassLoader(), mUnit->GetClassLinker(),
+          *it->target_dex_file_, nullptr /* code_item not used */, 0u /* class_def_idx not used */,
+          it->target_method_idx_, 0u /* access_flags not used */,
+          nullptr /* verified_method not used */);
+      resolved_method = compiler_driver->ResolveMethod(soa, current_dex_cache, class_loader, &cu,
+                                                       it->target_method_idx_, invoke_type, false);
+      if (resolved_method != nullptr) {
+        // Since this was a dequickened virtual, it is guaranteed to be resolved. However, it may be
+        // resolved to an interface method. If this is the case then change the invoke type to
+        // interface with the assumption that sharp_type will be kVirtual.
+        if (resolved_method->GetInvokeType() == kInterface) {
+          it->flags_ = (it->flags_ & ~(kInvokeTypeMask << kBitInvokeTypeBegin)) |
+              (static_cast<uint16_t>(kInterface) << kBitInvokeTypeBegin);
+        }
+      }
+    }
     if (UNLIKELY(resolved_method == nullptr)) {
       continue;
     }
     compiler_driver->GetResolvedMethodDexFileLocation(resolved_method,
         &it->declaring_dex_file_, &it->declaring_class_idx_, &it->declaring_method_idx_);
-    it->vtable_idx_ = compiler_driver->GetResolvedMethodVTableIndex(resolved_method, invoke_type);
+    if (!it->IsQuickened()) {
+      // For quickened invoke virtuals we may have desharpened to an interface method which
+      // wont give us the right method index, in this case blindly dispatch or else we can't
+      // compile the method. Converting the invoke to interface dispatch doesn't work since we
+      // have no way to get the dex method index for quickened invoke virtuals in the interface
+      // trampolines.
+      it->vtable_idx_ =
+          compiler_driver->GetResolvedMethodVTableIndex(resolved_method, invoke_type);
+    }
 
-    MethodReference target_method(mUnit->GetDexFile(), it->MethodIndex());
+    MethodReference target_method(it->target_dex_file_, it->target_method_idx_);
     int fast_path_flags = compiler_driver->IsFastInvoke(
-        soa, dex_cache, class_loader, mUnit, referrer_class.Get(), resolved_method, &invoke_type,
-        &target_method, devirt_target, &it->direct_code_, &it->direct_method_);
-    bool is_referrers_class = (referrer_class.Get() == resolved_method->GetDeclaringClass());
-    bool is_class_initialized =
+        soa, dex_cache, class_loader, mUnit, referrer_class.Get(), resolved_method,
+        &invoke_type, &target_method, devirt_target, &it->direct_code_, &it->direct_method_);
+    const bool is_referrers_class = referrer_class.Get() == resolved_method->GetDeclaringClass();
+    const bool is_class_initialized =
         compiler_driver->IsMethodsClassInitialized(referrer_class.Get(), resolved_method);
     uint16_t other_flags = it->flags_ &
         ~(kFlagFastPath | kFlagClassIsInitialized | (kInvokeTypeMask << kBitSharpTypeBegin));
diff --git a/compiler/dex/mir_method_info.h b/compiler/dex/mir_method_info.h
index 08fb103..e131c96 100644
--- a/compiler/dex/mir_method_info.h
+++ b/compiler/dex/mir_method_info.h
@@ -46,6 +46,9 @@ class MirMethodInfo {
   const DexFile* DeclaringDexFile() const {
     return declaring_dex_file_;
   }
+  void SetDeclaringDexFile(const DexFile* dex_file) {
+    declaring_dex_file_ = dex_file;
+  }
 
   uint16_t DeclaringClassIndex() const {
     return declaring_class_idx_;
@@ -98,11 +101,12 @@ class MirMethodLoweringInfo : public MirMethodInfo {
                       MirMethodLoweringInfo* method_infos, size_t count)
       LOCKS_EXCLUDED(Locks::mutator_lock_);
 
-  MirMethodLoweringInfo(uint16_t method_idx, InvokeType type)
+  MirMethodLoweringInfo(uint16_t method_idx, InvokeType type, bool is_quickened)
       : MirMethodInfo(method_idx,
                       ((type == kStatic) ? kFlagIsStatic : 0u) |
                       (static_cast<uint16_t>(type) << kBitInvokeTypeBegin) |
-                      (static_cast<uint16_t>(type) << kBitSharpTypeBegin)),
+                      (static_cast<uint16_t>(type) << kBitSharpTypeBegin) |
+                      (is_quickened ? kFlagQuickened : 0u)),
         direct_code_(0u),
         direct_method_(0u),
         target_dex_file_(nullptr),
@@ -131,6 +135,11 @@ class MirMethodLoweringInfo : public MirMethodInfo {
     return (flags_ & kFlagClassIsInitialized) != 0u;
   }
 
+  // Returns true iff the method invoke is INVOKE_VIRTUAL_QUICK or INVOKE_VIRTUAL_RANGE_QUICK.
+  bool IsQuickened() const {
+    return (flags_ & kFlagQuickened) != 0u;
+  }
+
   InvokeType GetInvokeType() const {
     return static_cast<InvokeType>((flags_ >> kBitInvokeTypeBegin) & kInvokeTypeMask);
   }
@@ -146,6 +155,9 @@ class MirMethodLoweringInfo : public MirMethodInfo {
   uint16_t VTableIndex() const {
     return vtable_idx_;
   }
+  void SetVTableIndex(uint16_t index) {
+    vtable_idx_ = index;
+  }
 
   uintptr_t DirectCode() const {
     return direct_code_;
@@ -159,6 +171,20 @@ class MirMethodLoweringInfo : public MirMethodInfo {
     return stats_flags_;
   }
 
+  void CheckEquals(const MirMethodLoweringInfo& info) const {
+    CHECK_EQ(method_idx_, info.method_idx_);
+    CHECK_EQ(flags_, info.flags_);
+    CHECK_EQ(declaring_method_idx_, info.declaring_method_idx_);
+    CHECK_EQ(declaring_class_idx_, info.declaring_class_idx_);
+    CHECK_EQ(declaring_dex_file_, info.declaring_dex_file_);
+    CHECK_EQ(direct_code_, info.direct_code_);
+    CHECK_EQ(direct_method_, info.direct_method_);
+    CHECK_EQ(target_dex_file_, info.target_dex_file_);
+    CHECK_EQ(target_method_idx_, info.target_method_idx_);
+    CHECK_EQ(vtable_idx_, info.vtable_idx_);
+    CHECK_EQ(stats_flags_, info.stats_flags_);
+  }
+
  private:
   enum {
     kBitFastPath = kMethodInfoBitEnd,
@@ -168,12 +194,14 @@ class MirMethodLoweringInfo : public MirMethodInfo {
     kBitSharpTypeEnd = kBitSharpTypeBegin + 3,  // 3 bits for sharp type.
     kBitIsReferrersClass = kBitSharpTypeEnd,
     kBitClassIsInitialized,
+    kBitQuickened,
     kMethodLoweringInfoBitEnd
   };
   static_assert(kMethodLoweringInfoBitEnd <= 16, "Too many flags");
   static constexpr uint16_t kFlagFastPath = 1u << kBitFastPath;
   static constexpr uint16_t kFlagIsReferrersClass = 1u << kBitIsReferrersClass;
   static constexpr uint16_t kFlagClassIsInitialized = 1u << kBitClassIsInitialized;
+  static constexpr uint16_t kFlagQuickened = 1u << kBitQuickened;
   static constexpr uint16_t kInvokeTypeMask = 7u;
   static_assert((1u << (kBitInvokeTypeEnd - kBitInvokeTypeBegin)) - 1u == kInvokeTypeMask,
                 "assert invoke type bits failed");
diff --git a/compiler/dex/mir_optimization.cc b/compiler/dex/mir_optimization.cc
index fd67d4e..93749e4 100644
--- a/compiler/dex/mir_optimization.cc
+++ b/compiler/dex/mir_optimization.cc
@@ -1437,7 +1437,7 @@ void MIRGraph::ComputeInlineIFieldLoweringInfo(uint16_t field_idx, MIR* invoke,
       nullptr /* code_item not used */, 0u /* class_def_idx not used */, target.dex_method_index,
       0u /* access_flags not used */, nullptr /* verified_method not used */);
   DexMemAccessType type = IGetOrIPutMemAccessType(iget_or_iput->dalvikInsn.opcode);
-  MirIFieldLoweringInfo inlined_field_info(field_idx, type);
+  MirIFieldLoweringInfo inlined_field_info(field_idx, type, false);
   MirIFieldLoweringInfo::Resolve(cu_->compiler_driver, &inlined_unit, &inlined_field_info, 1u);
   DCHECK(inlined_field_info.IsResolved());
 
diff --git a/compiler/dex/mir_optimization_test.cc b/compiler/dex/mir_optimization_test.cc
index be05b80..9ce5ebb 100644
--- a/compiler/dex/mir_optimization_test.cc
+++ b/compiler/dex/mir_optimization_test.cc
@@ -254,7 +254,7 @@ class MirOptimizationTest : public testing::Test {
     cu_.mir_graph->method_lowering_infos_.reserve(count);
     for (size_t i = 0u; i != count; ++i) {
       const MethodDef* def = &defs[i];
-      MirMethodLoweringInfo method_info(def->method_idx, def->invoke_type);
+      MirMethodLoweringInfo method_info(def->method_idx, def->invoke_type, false);
       if (def->declaring_dex_file != 0u) {
         method_info.declaring_dex_file_ = reinterpret_cast<const DexFile*>(def->declaring_dex_file);
         method_info.declaring_class_idx_ = def->declaring_class_idx;
@@ -407,7 +407,7 @@ class NullCheckEliminationTest : public MirOptimizationTest {
     cu_.mir_graph->ifield_lowering_infos_.reserve(count);
     for (size_t i = 0u; i != count; ++i) {
       const IFieldDef* def = &defs[i];
-      MirIFieldLoweringInfo field_info(def->field_idx, def->type);
+      MirIFieldLoweringInfo field_info(def->field_idx, def->type, false);
       if (def->declaring_dex_file != 0u) {
         field_info.declaring_dex_file_ = reinterpret_cast<const DexFile*>(def->declaring_dex_file);
         field_info.declaring_class_idx_ = def->declaring_class_idx;
diff --git a/compiler/dex/quick/dex_file_method_inliner.cc b/compiler/dex/quick/dex_file_method_inliner.cc
index 7245853..f636e3b 100644
--- a/compiler/dex/quick/dex_file_method_inliner.cc
+++ b/compiler/dex/quick/dex_file_method_inliner.cc
@@ -427,7 +427,7 @@ bool DexFileMethodInliner::GenIntrinsic(Mir2Lir* backend, CallInfo* info) {
   InlineMethod intrinsic;
   {
     ReaderMutexLock mu(Thread::Current(), lock_);
-    auto it = inline_methods_.find(info->index);
+    auto it = inline_methods_.find(info->method_ref.dex_method_index);
     if (it == inline_methods_.end() || (it->second.flags & kInlineIntrinsic) == 0) {
       return false;
     }
diff --git a/compiler/dex/quick/gen_common.cc b/compiler/dex/quick/gen_common.cc
index 3c9b7a3..6f68d1a 100644
--- a/compiler/dex/quick/gen_common.cc
+++ b/compiler/dex/quick/gen_common.cc
@@ -865,7 +865,12 @@ void Mir2Lir::HandleSlowPaths() {
 void Mir2Lir::GenIGet(MIR* mir, int opt_flags, OpSize size, Primitive::Type type,
                       RegLocation rl_dest, RegLocation rl_obj) {
   const MirIFieldLoweringInfo& field_info = mir_graph_->GetIFieldLoweringInfo(mir);
-  DCHECK_EQ(IGetMemAccessType(mir->dalvikInsn.opcode), field_info.MemAccessType());
+  if (kIsDebugBuild) {
+    auto mem_access_type = IsInstructionIGetQuickOrIPutQuick(mir->dalvikInsn.opcode) ?
+        IGetQuickOrIPutQuickMemAccessType(mir->dalvikInsn.opcode) :
+        IGetMemAccessType(mir->dalvikInsn.opcode);
+    DCHECK_EQ(mem_access_type, field_info.MemAccessType()) << mir->dalvikInsn.opcode;
+  }
   cu_->compiler_driver->ProcessedInstanceField(field_info.FastGet());
   if (!ForceSlowFieldPath(cu_) && field_info.FastGet()) {
     RegisterClass reg_class = RegClassForFieldLoadStore(size, field_info.IsVolatile());
@@ -890,6 +895,9 @@ void Mir2Lir::GenIGet(MIR* mir, int opt_flags, OpSize size, Primitive::Type type
       StoreValue(rl_dest, rl_result);
     }
   } else {
+    if (field_info.DeclaringDexFile() != nullptr) {
+      DCHECK_EQ(field_info.DeclaringDexFile(), cu_->dex_file);
+    }
     DCHECK(SizeMatchesTypeForEntrypoint(size, type));
     QuickEntrypointEnum target;
     switch (type) {
@@ -939,7 +947,12 @@ void Mir2Lir::GenIGet(MIR* mir, int opt_flags, OpSize size, Primitive::Type type
 void Mir2Lir::GenIPut(MIR* mir, int opt_flags, OpSize size,
                       RegLocation rl_src, RegLocation rl_obj) {
   const MirIFieldLoweringInfo& field_info = mir_graph_->GetIFieldLoweringInfo(mir);
-  DCHECK_EQ(IPutMemAccessType(mir->dalvikInsn.opcode), field_info.MemAccessType());
+  if (kIsDebugBuild) {
+    auto mem_access_type = IsInstructionIGetQuickOrIPutQuick(mir->dalvikInsn.opcode) ?
+        IGetQuickOrIPutQuickMemAccessType(mir->dalvikInsn.opcode) :
+        IPutMemAccessType(mir->dalvikInsn.opcode);
+    DCHECK_EQ(mem_access_type, field_info.MemAccessType());
+  }
   cu_->compiler_driver->ProcessedInstanceField(field_info.FastPut());
   if (!ForceSlowFieldPath(cu_) && field_info.FastPut()) {
     RegisterClass reg_class = RegClassForFieldLoadStore(size, field_info.IsVolatile());
diff --git a/compiler/dex/quick/gen_invoke.cc b/compiler/dex/quick/gen_invoke.cc
index 8e3df7c..040b07c 100755
--- a/compiler/dex/quick/gen_invoke.cc
+++ b/compiler/dex/quick/gen_invoke.cc
@@ -863,11 +863,12 @@ RegLocation Mir2Lir::InlineTarget(CallInfo* info) {
   RegLocation res;
   if (info->result.location == kLocInvalid) {
     // If result is unused, return a sink target based on type of invoke target.
-    res = GetReturn(ShortyToRegClass(mir_graph_->GetShortyFromTargetIdx(info->index)[0]));
+    res = GetReturn(
+        ShortyToRegClass(mir_graph_->GetShortyFromMethodReference(info->method_ref)[0]));
   } else {
     res = info->result;
     DCHECK_EQ(LocToRegClass(res),
-              ShortyToRegClass(mir_graph_->GetShortyFromTargetIdx(info->index)[0]));
+              ShortyToRegClass(mir_graph_->GetShortyFromMethodReference(info->method_ref)[0]));
   }
   return res;
 }
@@ -876,11 +877,12 @@ RegLocation Mir2Lir::InlineTargetWide(CallInfo* info) {
   RegLocation res;
   if (info->result.location == kLocInvalid) {
     // If result is unused, return a sink target based on type of invoke target.
-    res = GetReturnWide(ShortyToRegClass(mir_graph_->GetShortyFromTargetIdx(info->index)[0]));
+    res = GetReturnWide(ShortyToRegClass(
+        mir_graph_->GetShortyFromMethodReference(info->method_ref)[0]));
   } else {
     res = info->result;
     DCHECK_EQ(LocToRegClass(res),
-              ShortyToRegClass(mir_graph_->GetShortyFromTargetIdx(info->index)[0]));
+              ShortyToRegClass(mir_graph_->GetShortyFromMethodReference(info->method_ref)[0]));
   }
   return res;
 }
@@ -1418,7 +1420,8 @@ bool Mir2Lir::GenInlinedUnsafePut(CallInfo* info, bool is_long,
 
 void Mir2Lir::GenInvoke(CallInfo* info) {
   DCHECK(cu_->compiler_driver->GetMethodInlinerMap() != nullptr);
-  if (cu_->compiler_driver->GetMethodInlinerMap()->GetMethodInliner(cu_->dex_file)
+  const DexFile* dex_file = info->method_ref.dex_file;
+  if (cu_->compiler_driver->GetMethodInlinerMap()->GetMethodInliner(dex_file)
       ->GenIntrinsic(this, info)) {
     return;
   }
@@ -1428,7 +1431,7 @@ void Mir2Lir::GenInvoke(CallInfo* info) {
 void Mir2Lir::GenInvokeNoInline(CallInfo* info) {
   int call_state = 0;
   LIR* null_ck;
-  LIR** p_null_ck = NULL;
+  LIR** p_null_ck = nullptr;
   NextCallInsn next_call_insn;
   FlushAllRegs();  /* Everything to home location */
   // Explicit register usage
@@ -1440,6 +1443,7 @@ void Mir2Lir::GenInvokeNoInline(CallInfo* info) {
   info->type = method_info.GetSharpType();
   bool fast_path = method_info.FastPath();
   bool skip_this;
+
   if (info->type == kInterface) {
     next_call_insn = fast_path ? NextInterfaceCallInsn : NextInterfaceCallInsnWithAccessCheck;
     skip_this = fast_path;
@@ -1469,7 +1473,8 @@ void Mir2Lir::GenInvokeNoInline(CallInfo* info) {
   // Finish up any of the call sequence not interleaved in arg loading
   while (call_state >= 0) {
     call_state = next_call_insn(cu_, info, call_state, target_method, method_info.VTableIndex(),
-                                method_info.DirectCode(), method_info.DirectMethod(), original_type);
+                                method_info.DirectCode(), method_info.DirectMethod(),
+                                original_type);
   }
   LIR* call_insn = GenCallInsn(method_info);
   MarkSafepointPC(call_insn);
diff --git a/compiler/dex/quick/mir_to_lir.cc b/compiler/dex/quick/mir_to_lir.cc
index 34e5e25..966a92d 100644
--- a/compiler/dex/quick/mir_to_lir.cc
+++ b/compiler/dex/quick/mir_to_lir.cc
@@ -540,6 +540,7 @@ void Mir2Lir::CompileDalvikInstruction(MIR* mir, BasicBlock* bb, LIR* label_list
       GenMoveException(rl_dest);
       break;
 
+    case Instruction::RETURN_VOID_BARRIER:
     case Instruction::RETURN_VOID:
       if (((cu_->access_flags & kAccConstructor) != 0) &&
           cu_->compiler_driver->RequiresConstructorBarrier(Thread::Current(), cu_->dex_file,
@@ -790,10 +791,12 @@ void Mir2Lir::CompileDalvikInstruction(MIR* mir, BasicBlock* bb, LIR* label_list
       GenArrayPut(opt_flags, kUnsignedByte, rl_src[1], rl_src[2], rl_src[0], 0, false);
       break;
 
+    case Instruction::IGET_OBJECT_QUICK:
     case Instruction::IGET_OBJECT:
       GenIGet(mir, opt_flags, kReference, Primitive::kPrimNot, rl_dest, rl_src[0]);
       break;
 
+    case Instruction::IGET_WIDE_QUICK:
     case Instruction::IGET_WIDE:
       // kPrimLong and kPrimDouble share the same entrypoints.
       if (rl_dest.fp) {
@@ -803,6 +806,7 @@ void Mir2Lir::CompileDalvikInstruction(MIR* mir, BasicBlock* bb, LIR* label_list
       }
       break;
 
+    case Instruction::IGET_QUICK:
     case Instruction::IGET:
       if (rl_dest.fp) {
         GenIGet(mir, opt_flags, kSingle, Primitive::kPrimFloat, rl_dest, rl_src[0]);
@@ -811,43 +815,54 @@ void Mir2Lir::CompileDalvikInstruction(MIR* mir, BasicBlock* bb, LIR* label_list
       }
       break;
 
+    case Instruction::IGET_CHAR_QUICK:
     case Instruction::IGET_CHAR:
       GenIGet(mir, opt_flags, kUnsignedHalf, Primitive::kPrimChar, rl_dest, rl_src[0]);
       break;
 
+    case Instruction::IGET_SHORT_QUICK:
     case Instruction::IGET_SHORT:
       GenIGet(mir, opt_flags, kSignedHalf, Primitive::kPrimShort, rl_dest, rl_src[0]);
       break;
 
+    case Instruction::IGET_BOOLEAN_QUICK:
     case Instruction::IGET_BOOLEAN:
       GenIGet(mir, opt_flags, kUnsignedByte, Primitive::kPrimBoolean, rl_dest, rl_src[0]);
       break;
 
+    case Instruction::IGET_BYTE_QUICK:
     case Instruction::IGET_BYTE:
       GenIGet(mir, opt_flags, kSignedByte, Primitive::kPrimByte, rl_dest, rl_src[0]);
       break;
 
+    case Instruction::IPUT_WIDE_QUICK:
     case Instruction::IPUT_WIDE:
       GenIPut(mir, opt_flags, rl_src[0].fp ? kDouble : k64, rl_src[0], rl_src[1]);
       break;
 
+    case Instruction::IPUT_OBJECT_QUICK:
     case Instruction::IPUT_OBJECT:
       GenIPut(mir, opt_flags, kReference, rl_src[0], rl_src[1]);
       break;
 
+    case Instruction::IPUT_QUICK:
     case Instruction::IPUT:
       GenIPut(mir, opt_flags, rl_src[0].fp ? kSingle : k32, rl_src[0], rl_src[1]);
       break;
 
+    case Instruction::IPUT_BYTE_QUICK:
+    case Instruction::IPUT_BOOLEAN_QUICK:
     case Instruction::IPUT_BYTE:
     case Instruction::IPUT_BOOLEAN:
       GenIPut(mir, opt_flags, kUnsignedByte, rl_src[0], rl_src[1]);
       break;
 
+    case Instruction::IPUT_CHAR_QUICK:
     case Instruction::IPUT_CHAR:
       GenIPut(mir, opt_flags, kUnsignedHalf, rl_src[0], rl_src[1]);
       break;
 
+    case Instruction::IPUT_SHORT_QUICK:
     case Instruction::IPUT_SHORT:
       GenIPut(mir, opt_flags, kSignedHalf, rl_src[0], rl_src[1]);
       break;
@@ -921,9 +936,12 @@ void Mir2Lir::CompileDalvikInstruction(MIR* mir, BasicBlock* bb, LIR* label_list
       GenInvoke(mir_graph_->NewMemCallInfo(bb, mir, kDirect, true));
       break;
 
+    case Instruction::INVOKE_VIRTUAL_QUICK:
     case Instruction::INVOKE_VIRTUAL:
       GenInvoke(mir_graph_->NewMemCallInfo(bb, mir, kVirtual, false));
       break;
+
+    case Instruction::INVOKE_VIRTUAL_RANGE_QUICK:
     case Instruction::INVOKE_VIRTUAL_RANGE:
       GenInvoke(mir_graph_->NewMemCallInfo(bb, mir, kVirtual, true));
       break;
diff --git a/compiler/dex/quick/quick_compiler.cc b/compiler/dex/quick/quick_compiler.cc
index 19c2a5a..fcf4716 100644
--- a/compiler/dex/quick/quick_compiler.cc
+++ b/compiler/dex/quick/quick_compiler.cc
@@ -542,6 +542,11 @@ bool QuickCompiler::CanCompileMethod(uint32_t method_idx, const DexFile& dex_fil
 void QuickCompiler::InitCompilationUnit(CompilationUnit& cu) const {
   // Disable optimizations according to instruction set.
   cu.disable_opt |= kDisabledOptimizationsPerISA[cu.instruction_set];
+  if (Runtime::Current()->UseJit()) {
+    // Disable these optimizations for JIT until quickened byte codes are done being implemented.
+    // TODO: Find a cleaner way to do this.
+    cu.disable_opt |= 1u << kLocalValueNumbering;
+  }
 }
 
 void QuickCompiler::Init() {
diff --git a/compiler/dex/verification_results.cc b/compiler/dex/verification_results.cc
index 4ff173d..51a3d84 100644
--- a/compiler/dex/verification_results.cc
+++ b/compiler/dex/verification_results.cc
@@ -66,8 +66,10 @@ bool VerificationResults::ProcessVerifiedMethod(verifier::MethodVerifier* method
     // TODO: Investigate why are we doing the work again for this method and try to avoid it.
     LOG(WARNING) << "Method processed more than once: "
         << PrettyMethod(ref.dex_method_index, *ref.dex_file);
-    DCHECK_EQ(it->second->GetDevirtMap().size(), verified_method->GetDevirtMap().size());
-    DCHECK_EQ(it->second->GetSafeCastSet().size(), verified_method->GetSafeCastSet().size());
+    if (!Runtime::Current()->UseJit()) {
+      DCHECK_EQ(it->second->GetDevirtMap().size(), verified_method->GetDevirtMap().size());
+      DCHECK_EQ(it->second->GetSafeCastSet().size(), verified_method->GetSafeCastSet().size());
+    }
     DCHECK_EQ(it->second->GetDexGcMap().size(), verified_method->GetDexGcMap().size());
     delete it->second;
     verified_methods_.erase(it);
diff --git a/compiler/dex/verified_method.cc b/compiler/dex/verified_method.cc
index 21e965d..42d66be 100644
--- a/compiler/dex/verified_method.cc
+++ b/compiler/dex/verified_method.cc
@@ -24,6 +24,7 @@
 #include "base/stl_util.h"
 #include "dex_file.h"
 #include "dex_instruction-inl.h"
+#include "dex_instruction_utils.h"
 #include "mirror/art_method-inl.h"
 #include "mirror/class-inl.h"
 #include "mirror/dex_cache-inl.h"
@@ -52,6 +53,11 @@ const VerifiedMethod* VerifiedMethod::Create(verifier::MethodVerifier* method_ve
     if (method_verifier->HasVirtualOrInterfaceInvokes()) {
       verified_method->GenerateDevirtMap(method_verifier);
     }
+
+    // Only need dequicken info for JIT so far.
+    if (Runtime::Current()->UseJit()) {
+      verified_method->GenerateDequickenMap(method_verifier);
+    }
   }
 
   if (method_verifier->HasCheckCasts()) {
@@ -65,6 +71,12 @@ const MethodReference* VerifiedMethod::GetDevirtTarget(uint32_t dex_pc) const {
   return (it != devirt_map_.end()) ? &it->second : nullptr;
 }
 
+const DexFileReference* VerifiedMethod::GetDequickenIndex(uint32_t dex_pc) const {
+  DCHECK(Runtime::Current()->UseJit());
+  auto it = dequicken_map_.find(dex_pc);
+  return (it != dequicken_map_.end()) ? &it->second : nullptr;
+}
+
 bool VerifiedMethod::IsSafeCast(uint32_t pc) const {
   return std::binary_search(safe_cast_set_.begin(), safe_cast_set_.end(), pc);
 }
@@ -182,7 +194,7 @@ void VerifiedMethod::ComputeGcMapSizes(verifier::MethodVerifier* method_verifier
   *log2_max_gc_pc = i;
 }
 
-void VerifiedMethod::GenerateDeQuickenMap(verifier::MethodVerifier* method_verifier) {
+void VerifiedMethod::GenerateDequickenMap(verifier::MethodVerifier* method_verifier) {
   if (method_verifier->HasFailures()) {
     return;
   }
@@ -196,13 +208,24 @@ void VerifiedMethod::GenerateDeQuickenMap(verifier::MethodVerifier* method_verif
     if (is_virtual_quick || is_range_quick) {
       uint32_t dex_pc = inst->GetDexPc(insns);
       verifier::RegisterLine* line = method_verifier->GetRegLine(dex_pc);
-      mirror::ArtMethod* method = method_verifier->GetQuickInvokedMethod(inst, line,
-                                                                         is_range_quick);
+      mirror::ArtMethod* method =
+          method_verifier->GetQuickInvokedMethod(inst, line, is_range_quick);
       CHECK(method != nullptr);
       // The verifier must know what the type of the object was or else we would have gotten a
       // failure. Put the dex method index in the dequicken map since we need this to get number of
       // arguments in the compiler.
-      dequicken_map_.Put(dex_pc, method->ToMethodReference());
+      dequicken_map_.Put(dex_pc, DexFileReference(method->GetDexFile(),
+                                                  method->GetDexMethodIndex()));
+    } else if (IsInstructionIGetQuickOrIPutQuick(inst->Opcode())) {
+      uint32_t dex_pc = inst->GetDexPc(insns);
+      verifier::RegisterLine* line = method_verifier->GetRegLine(dex_pc);
+      mirror::ArtField* field = method_verifier->GetQuickFieldAccess(inst, line);
+      CHECK(field != nullptr);
+      // The verifier must know what the type of the field was or else we would have gotten a
+      // failure. Put the dex field index in the dequicken map since we need this for lowering
+      // in the compiler.
+      // TODO: Putting a field index in a method reference is gross.
+      dequicken_map_.Put(dex_pc, DexFileReference(field->GetDexFile(), field->GetDexFieldIndex()));
     }
   }
 }
diff --git a/compiler/dex/verified_method.h b/compiler/dex/verified_method.h
index fe9dfd1..748bdcb 100644
--- a/compiler/dex/verified_method.h
+++ b/compiler/dex/verified_method.h
@@ -20,6 +20,7 @@
 #include <vector>
 
 #include "base/mutex.h"
+#include "dex_file.h"
 #include "method_reference.h"
 #include "safe_map.h"
 
@@ -39,6 +40,9 @@ class VerifiedMethod {
   // Devirtualization map type maps dex offset to concrete method reference.
   typedef SafeMap<uint32_t, MethodReference> DevirtualizationMap;
 
+  // Devirtualization map type maps dex offset to field / method idx.
+  typedef SafeMap<uint32_t, DexFileReference> DequickenMap;
+
   static const VerifiedMethod* Create(verifier::MethodVerifier* method_verifier, bool compile)
       SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
   ~VerifiedMethod() = default;
@@ -58,6 +62,10 @@ class VerifiedMethod {
   // Returns the devirtualization target method, or nullptr if none.
   const MethodReference* GetDevirtTarget(uint32_t dex_pc) const;
 
+  // Returns the dequicken field / method for a quick invoke / field get. Returns null if there is
+  // no entry for that dex pc.
+  const DexFileReference* GetDequickenIndex(uint32_t dex_pc) const;
+
   // Returns true if the cast can statically be verified to be redundant
   // by using the check-cast elision peephole optimization in the verifier.
   bool IsSafeCast(uint32_t pc) const;
@@ -86,7 +94,7 @@ class VerifiedMethod {
       SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
 
   // Generate dequickening map into dequicken_map_.
-  void GenerateDeQuickenMap(verifier::MethodVerifier* method_verifier)
+  void GenerateDequickenMap(verifier::MethodVerifier* method_verifier)
       SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
 
   // Generate safe case set into safe_cast_set_.
@@ -95,9 +103,9 @@ class VerifiedMethod {
 
   std::vector<uint8_t> dex_gc_map_;
   DevirtualizationMap devirt_map_;
-  // Dequicken map is required for having the compiler compiled quickened invokes. The quicken map
-  // enables us to get the dex method index so that we can get the required argument count.
-  DevirtualizationMap dequicken_map_;
+  // Dequicken map is required for compiling quickened byte codes. The quicken maps from
+  // dex PC to dex method index or dex field index based on the instruction.
+  DequickenMap dequicken_map_;
   SafeCastSet safe_cast_set_;
 };
 
diff --git a/compiler/dex/vreg_analysis.cc b/compiler/dex/vreg_analysis.cc
index b620969..2b78e38 100644
--- a/compiler/dex/vreg_analysis.cc
+++ b/compiler/dex/vreg_analysis.cc
@@ -19,6 +19,7 @@
 #include "compiler_ir.h"
 #include "dex/dataflow_iterator-inl.h"
 #include "dex_flags.h"
+#include "driver/dex_compilation_unit.h"
 
 namespace art {
 
@@ -259,8 +260,8 @@ bool MIRGraph::InferTypeAndSize(BasicBlock* bb, MIR* mir, bool changed) {
     if ((flags & Instruction::kInvoke) &&
         (attrs & (DF_FORMAT_35C | DF_FORMAT_3RC))) {
       DCHECK_EQ(next, 0);
-      int target_idx = mir->dalvikInsn.vB;
-      const char* shorty = GetShortyFromTargetIdx(target_idx);
+      const auto& lowering_info = GetMethodLoweringInfo(mir);
+      const char* shorty = GetShortyFromMethodReference(lowering_info.GetTargetMethod());
       // Handle result type if floating point
       if ((shorty[0] == 'F') || (shorty[0] == 'D')) {
         MIR* move_result_mir = FindMoveResult(bb, mir);
diff --git a/compiler/driver/compiler_driver-inl.h b/compiler/driver/compiler_driver-inl.h
index 9948c82..4a35e9f 100644
--- a/compiler/driver/compiler_driver-inl.h
+++ b/compiler/driver/compiler_driver-inl.h
@@ -56,14 +56,13 @@ inline mirror::Class* CompilerDriver::ResolveCompilingMethodsClass(
   return referrer_class;
 }
 
-inline mirror::ArtField* CompilerDriver::ResolveField(
+inline mirror::ArtField* CompilerDriver::ResolveFieldWithDexFile(
     const ScopedObjectAccess& soa, Handle<mirror::DexCache> dex_cache,
-    Handle<mirror::ClassLoader> class_loader, const DexCompilationUnit* mUnit,
+    Handle<mirror::ClassLoader> class_loader, const DexFile* dex_file,
     uint32_t field_idx, bool is_static) {
-  DCHECK_EQ(dex_cache->GetDexFile(), mUnit->GetDexFile());
-  DCHECK_EQ(class_loader.Get(), soa.Decode<mirror::ClassLoader*>(mUnit->GetClassLoader()));
-  mirror::ArtField* resolved_field = mUnit->GetClassLinker()->ResolveField(
-      *mUnit->GetDexFile(), field_idx, dex_cache, class_loader, is_static);
+  DCHECK_EQ(dex_cache->GetDexFile(), dex_file);
+  mirror::ArtField* resolved_field = Runtime::Current()->GetClassLinker()->ResolveField(
+      *dex_file, field_idx, dex_cache, class_loader, is_static);
   DCHECK_EQ(resolved_field == nullptr, soa.Self()->IsExceptionPending());
   if (UNLIKELY(resolved_field == nullptr)) {
     // Clean up any exception left by type resolution.
@@ -78,6 +77,19 @@ inline mirror::ArtField* CompilerDriver::ResolveField(
   return resolved_field;
 }
 
+inline mirror::DexCache* CompilerDriver::FindDexCache(const DexFile* dex_file) {
+  return Runtime::Current()->GetClassLinker()->FindDexCache(*dex_file);
+}
+
+inline mirror::ArtField* CompilerDriver::ResolveField(
+    const ScopedObjectAccess& soa, Handle<mirror::DexCache> dex_cache,
+    Handle<mirror::ClassLoader> class_loader, const DexCompilationUnit* mUnit,
+    uint32_t field_idx, bool is_static) {
+  DCHECK_EQ(class_loader.Get(), soa.Decode<mirror::ClassLoader*>(mUnit->GetClassLoader()));
+  return ResolveFieldWithDexFile(soa, dex_cache, class_loader, mUnit->GetDexFile(), field_idx,
+                                 is_static);
+}
+
 inline void CompilerDriver::GetResolvedFieldDexFileLocation(
     mirror::ArtField* resolved_field, const DexFile** declaring_dex_file,
     uint16_t* declaring_class_idx, uint16_t* declaring_field_idx) {
@@ -172,7 +184,7 @@ inline bool CompilerDriver::IsStaticFieldsClassInitialized(mirror::Class* referr
 inline mirror::ArtMethod* CompilerDriver::ResolveMethod(
     ScopedObjectAccess& soa, Handle<mirror::DexCache> dex_cache,
     Handle<mirror::ClassLoader> class_loader, const DexCompilationUnit* mUnit,
-    uint32_t method_idx, InvokeType invoke_type) {
+    uint32_t method_idx, InvokeType invoke_type, bool check_incompatible_class_change) {
   DCHECK_EQ(dex_cache->GetDexFile(), mUnit->GetDexFile());
   DCHECK_EQ(class_loader.Get(), soa.Decode<mirror::ClassLoader*>(mUnit->GetClassLoader()));
   mirror::ArtMethod* resolved_method = mUnit->GetClassLinker()->ResolveMethod(
@@ -184,7 +196,8 @@ inline mirror::ArtMethod* CompilerDriver::ResolveMethod(
     soa.Self()->ClearException();
     return nullptr;
   }
-  if (UNLIKELY(resolved_method->CheckIncompatibleClassChange(invoke_type))) {
+  if (check_incompatible_class_change &&
+      UNLIKELY(resolved_method->CheckIncompatibleClassChange(invoke_type))) {
     // Silently return nullptr on incompatible class change.
     return nullptr;
   }
@@ -227,14 +240,14 @@ inline int CompilerDriver::IsFastInvoke(
                                                         target_method->dex_method_index))) {
     return 0;
   }
-
   // Sharpen a virtual call into a direct call when the target is known not to have been
   // overridden (ie is final).
-  bool can_sharpen_virtual_based_on_type =
+  const bool same_dex_file = target_method->dex_file == mUnit->GetDexFile();
+  bool can_sharpen_virtual_based_on_type = same_dex_file &&
       (*invoke_type == kVirtual) && (resolved_method->IsFinal() || methods_class->IsFinal());
   // For invoke-super, ensure the vtable index will be correct to dispatch in the vtable of
   // the super class.
-  bool can_sharpen_super_based_on_type = (*invoke_type == kSuper) &&
+  bool can_sharpen_super_based_on_type = same_dex_file && (*invoke_type == kSuper) &&
       (referrer_class != methods_class) && referrer_class->IsSubClass(methods_class) &&
       resolved_method->GetMethodIndex() < methods_class->GetVTableLength() &&
       (methods_class->GetVTableEntry(resolved_method->GetMethodIndex()) == resolved_method) &&
@@ -243,10 +256,10 @@ inline int CompilerDriver::IsFastInvoke(
   if (can_sharpen_virtual_based_on_type || can_sharpen_super_based_on_type) {
     // Sharpen a virtual call into a direct call. The method_idx is into referrer's
     // dex cache, check that this resolved method is where we expect it.
-    CHECK(target_method->dex_file == mUnit->GetDexFile());
-    DCHECK(dex_cache.Get() == mUnit->GetClassLinker()->FindDexCache(*mUnit->GetDexFile()));
-    CHECK(referrer_class->GetDexCache()->GetResolvedMethod(target_method->dex_method_index) ==
-        resolved_method) << PrettyMethod(resolved_method);
+    CHECK_EQ(target_method->dex_file, mUnit->GetDexFile());
+    DCHECK_EQ(dex_cache.Get(), mUnit->GetClassLinker()->FindDexCache(*mUnit->GetDexFile()));
+    CHECK_EQ(referrer_class->GetDexCache()->GetResolvedMethod(target_method->dex_method_index),
+             resolved_method) << PrettyMethod(resolved_method);
     int stats_flags = kFlagMethodResolved;
     GetCodeAndMethodForDirectCall(/*out*/invoke_type,
                                   kDirect,  // Sharp type
diff --git a/compiler/driver/compiler_driver.cc b/compiler/driver/compiler_driver.cc
index b8a8936..15b3d08 100644
--- a/compiler/driver/compiler_driver.cc
+++ b/compiler/driver/compiler_driver.cc
@@ -360,6 +360,7 @@ CompilerDriver::CompilerDriver(const CompilerOptions* compiler_options,
       classes_to_compile_(compiled_classes),
       thread_count_(thread_count),
       stats_(new AOTCompilationStats),
+      dedupe_enabled_(true),
       dump_stats_(dump_stats),
       dump_passes_(dump_passes),
       dump_cfg_file_name_(dump_cfg_file_name),
@@ -380,12 +381,7 @@ CompilerDriver::CompilerDriver(const CompilerOptions* compiler_options,
 
   compiler_->Init();
 
-  CHECK(!Runtime::Current()->IsStarted());
-  if (image_) {
-    CHECK(image_classes_.get() != nullptr);
-  } else {
-    CHECK(image_classes_.get() == nullptr);
-  }
+  CHECK_EQ(image_, image_classes_.get() != nullptr);
 
   // Read the profile file if one is provided.
   if (!profile_file.empty()) {
@@ -399,26 +395,32 @@ CompilerDriver::CompilerDriver(const CompilerOptions* compiler_options,
 }
 
 SwapVector<uint8_t>* CompilerDriver::DeduplicateCode(const ArrayRef<const uint8_t>& code) {
+  DCHECK(dedupe_enabled_);
   return dedupe_code_.Add(Thread::Current(), code);
 }
 
 SwapSrcMap* CompilerDriver::DeduplicateSrcMappingTable(const ArrayRef<SrcMapElem>& src_map) {
+  DCHECK(dedupe_enabled_);
   return dedupe_src_mapping_table_.Add(Thread::Current(), src_map);
 }
 
 SwapVector<uint8_t>* CompilerDriver::DeduplicateMappingTable(const ArrayRef<const uint8_t>& code) {
+  DCHECK(dedupe_enabled_);
   return dedupe_mapping_table_.Add(Thread::Current(), code);
 }
 
 SwapVector<uint8_t>* CompilerDriver::DeduplicateVMapTable(const ArrayRef<const uint8_t>& code) {
+  DCHECK(dedupe_enabled_);
   return dedupe_vmap_table_.Add(Thread::Current(), code);
 }
 
 SwapVector<uint8_t>* CompilerDriver::DeduplicateGCMap(const ArrayRef<const uint8_t>& code) {
+  DCHECK(dedupe_enabled_);
   return dedupe_gc_map_.Add(Thread::Current(), code);
 }
 
 SwapVector<uint8_t>* CompilerDriver::DeduplicateCFIInfo(const ArrayRef<const uint8_t>& cfi_info) {
+  DCHECK(dedupe_enabled_);
   return dedupe_cfi_info_.Add(Thread::Current(), cfi_info);
 }
 
@@ -491,8 +493,12 @@ void CompilerDriver::CompileAll(jobject class_loader,
 static DexToDexCompilationLevel GetDexToDexCompilationlevel(
     Thread* self, Handle<mirror::ClassLoader> class_loader, const DexFile& dex_file,
     const DexFile::ClassDef& class_def) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
+  auto* const runtime = Runtime::Current();
+  if (runtime->UseJit()) {
+    return kDontDexToDexCompile;
+  }
   const char* descriptor = dex_file.GetClassDescriptor(class_def);
-  ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
+  ClassLinker* class_linker = runtime->GetClassLinker();
   mirror::Class* klass = class_linker->FindClass(self, descriptor, class_loader);
   if (klass == nullptr) {
     CHECK(self->IsExceptionPending());
@@ -518,9 +524,8 @@ static DexToDexCompilationLevel GetDexToDexCompilationlevel(
   }
 }
 
-void CompilerDriver::CompileOne(mirror::ArtMethod* method, TimingLogger* timings) {
+void CompilerDriver::CompileOne(Thread* self, mirror::ArtMethod* method, TimingLogger* timings) {
   DCHECK(!Runtime::Current()->IsStarted());
-  Thread* self = Thread::Current();
   jobject jclass_loader;
   const DexFile* dex_file;
   uint16_t class_def_idx;
@@ -529,9 +534,8 @@ void CompilerDriver::CompileOne(mirror::ArtMethod* method, TimingLogger* timings
   InvokeType invoke_type = method->GetInvokeType();
   {
     ScopedObjectAccessUnchecked soa(self);
-    ScopedLocalRef<jobject>
-      local_class_loader(soa.Env(),
-                    soa.AddLocalReference<jobject>(method->GetDeclaringClass()->GetClassLoader()));
+    ScopedLocalRef<jobject> local_class_loader(
+        soa.Env(), soa.AddLocalReference<jobject>(method->GetDeclaringClass()->GetClassLoader()));
     jclass_loader = soa.Env()->NewGlobalRef(local_class_loader.get());
     // Find the dex_file
     dex_file = method->GetDexFile();
@@ -549,7 +553,7 @@ void CompilerDriver::CompileOne(mirror::ArtMethod* method, TimingLogger* timings
   // Can we run DEX-to-DEX compiler on this class ?
   DexToDexCompilationLevel dex_to_dex_compilation_level = kDontDexToDexCompile;
   {
-    ScopedObjectAccess soa(Thread::Current());
+    ScopedObjectAccess soa(self);
     const DexFile::ClassDef& class_def = dex_file->GetClassDef(class_def_idx);
     StackHandleScope<1> hs(soa.Self());
     Handle<mirror::ClassLoader> class_loader(
@@ -557,12 +561,33 @@ void CompilerDriver::CompileOne(mirror::ArtMethod* method, TimingLogger* timings
     dex_to_dex_compilation_level = GetDexToDexCompilationlevel(self, class_loader, *dex_file,
                                                                class_def);
   }
-  CompileMethod(code_item, access_flags, invoke_type, class_def_idx, method_idx, jclass_loader,
-                *dex_file, dex_to_dex_compilation_level, true);
+  CompileMethod(self, code_item, access_flags, invoke_type, class_def_idx, method_idx,
+                jclass_loader, *dex_file, dex_to_dex_compilation_level, true);
 
   self->GetJniEnv()->DeleteGlobalRef(jclass_loader);
+  self->TransitionFromSuspendedToRunnable();
+}
 
+CompiledMethod* CompilerDriver::CompileMethod(Thread* self, mirror::ArtMethod* method) {
+  const uint32_t method_idx = method->GetDexMethodIndex();
+  const uint32_t access_flags = method->GetAccessFlags();
+  const InvokeType invoke_type = method->GetInvokeType();
+  StackHandleScope<1> hs(self);
+  Handle<mirror::ClassLoader> class_loader(hs.NewHandle(
+      method->GetDeclaringClass()->GetClassLoader()));
+  jobject jclass_loader = class_loader.ToJObject();
+  const DexFile* dex_file = method->GetDexFile();
+  const uint16_t class_def_idx = method->GetClassDefIndex();
+  const DexFile::ClassDef& class_def = dex_file->GetClassDef(class_def_idx);
+  DexToDexCompilationLevel dex_to_dex_compilation_level =
+      GetDexToDexCompilationlevel(self, class_loader, *dex_file, class_def);
+  const DexFile::CodeItem* code_item = dex_file->GetCodeItem(method->GetCodeItemOffset());
+  self->TransitionFromRunnableToSuspended(kNative);
+  CompileMethod(self, code_item, access_flags, invoke_type, class_def_idx, method_idx,
+                jclass_loader, *dex_file, dex_to_dex_compilation_level, true);
+  auto* compiled_method = GetCompiledMethod(MethodReference(dex_file, method_idx));
   self->TransitionFromSuspendedToRunnable();
+  return compiled_method;
 }
 
 void CompilerDriver::Resolve(jobject class_loader, const std::vector<const DexFile*>& dex_files,
@@ -1035,7 +1060,8 @@ bool CompilerDriver::CanEmbedTypeInCode(const DexFile& dex_file, uint32_t type_i
                                         bool* is_type_initialized, bool* use_direct_type_ptr,
                                         uintptr_t* direct_type_ptr, bool* out_is_finalizable) {
   ScopedObjectAccess soa(Thread::Current());
-  mirror::DexCache* dex_cache = Runtime::Current()->GetClassLinker()->FindDexCache(dex_file);
+  Runtime* runtime = Runtime::Current();
+  mirror::DexCache* dex_cache = runtime->GetClassLinker()->FindDexCache(dex_file);
   mirror::Class* resolved_class = dex_cache->GetResolvedType(type_idx);
   if (resolved_class == nullptr) {
     return false;
@@ -1045,7 +1071,8 @@ bool CompilerDriver::CanEmbedTypeInCode(const DexFile& dex_file, uint32_t type_i
     return false;
   }
   *out_is_finalizable = resolved_class->IsFinalizable();
-  const bool compiling_boot = Runtime::Current()->GetHeap()->IsCompilingBoot();
+  gc::Heap* heap = runtime->GetHeap();
+  const bool compiling_boot = heap->IsCompilingBoot();
   const bool support_boot_image_fixup = GetSupportBootImageFixup();
   if (compiling_boot) {
     // boot -> boot class pointers.
@@ -1061,10 +1088,15 @@ bool CompilerDriver::CanEmbedTypeInCode(const DexFile& dex_file, uint32_t type_i
     } else {
       return false;
     }
+  } else if (runtime->UseJit() && !heap->IsMovableObject(resolved_class)) {
+    *is_type_initialized = resolved_class->IsInitialized();
+    // If the class may move around, then don't embed it as a direct pointer.
+    *use_direct_type_ptr = true;
+    *direct_type_ptr = reinterpret_cast<uintptr_t>(resolved_class);
+    return true;
   } else {
     // True if the class is in the image at app compiling time.
-    const bool class_in_image =
-        Runtime::Current()->GetHeap()->FindSpaceFromObject(resolved_class, false)->IsImageSpace();
+    const bool class_in_image = heap->FindSpaceFromObject(resolved_class, false)->IsImageSpace();
     if (class_in_image && support_boot_image_fixup) {
       // boot -> app class pointers.
       *is_type_initialized = resolved_class->IsInitialized();
@@ -1257,8 +1289,10 @@ void CompilerDriver::GetCodeAndMethodForDirectCall(InvokeType* type, InvokeType
   // invoked, so this can be passed to the out-of-line runtime support code.
   *direct_code = 0;
   *direct_method = 0;
+  Runtime* const runtime = Runtime::Current();
+  gc::Heap* const heap = runtime->GetHeap();
   bool use_dex_cache = GetCompilerOptions().GetCompilePic();  // Off by default
-  const bool compiling_boot = Runtime::Current()->GetHeap()->IsCompilingBoot();
+  const bool compiling_boot = heap->IsCompilingBoot();
   // TODO This is somewhat hacky. We should refactor all of this invoke codepath.
   const bool force_relocations = (compiling_boot ||
                                   GetCompilerOptions().GetIncludePatchInformation());
@@ -1267,14 +1301,15 @@ void CompilerDriver::GetCodeAndMethodForDirectCall(InvokeType* type, InvokeType
   }
   // TODO: support patching on all architectures.
   use_dex_cache = use_dex_cache || (force_relocations && !support_boot_image_fixup_);
-  bool method_code_in_boot = (method->GetDeclaringClass()->GetClassLoader() == nullptr);
+  mirror::Class* declaring_class = method->GetDeclaringClass();
+  bool method_code_in_boot = declaring_class->GetClassLoader() == nullptr;
   if (!use_dex_cache) {
     if (!method_code_in_boot) {
       use_dex_cache = true;
     } else {
       bool has_clinit_trampoline =
-          method->IsStatic() && !method->GetDeclaringClass()->IsInitialized();
-      if (has_clinit_trampoline && (method->GetDeclaringClass() != referrer_class)) {
+          method->IsStatic() && !declaring_class->IsInitialized();
+      if (has_clinit_trampoline && declaring_class != referrer_class) {
         // Ensure we run the clinit trampoline unless we are invoking a static method in the same
         // class.
         use_dex_cache = true;
@@ -1302,7 +1337,9 @@ void CompilerDriver::GetCodeAndMethodForDirectCall(InvokeType* type, InvokeType
   // The method is defined not within this dex file. We need a dex cache slot within the current
   // dex file or direct pointers.
   bool must_use_direct_pointers = false;
-  if (target_method->dex_file == method->GetDeclaringClass()->GetDexCache()->GetDexFile()) {
+  mirror::DexCache* dex_cache = declaring_class->GetDexCache();
+  if (target_method->dex_file == dex_cache->GetDexFile() &&
+    !(runtime->UseJit() && dex_cache->GetResolvedMethod(method->GetDexMethodIndex()) == nullptr)) {
     target_method->dex_method_index = method->GetDexMethodIndex();
   } else {
     if (no_guarantee_of_dex_cache_entry) {
@@ -1315,7 +1352,7 @@ void CompilerDriver::GetCodeAndMethodForDirectCall(InvokeType* type, InvokeType
       } else {
         if (force_relocations && !use_dex_cache) {
           target_method->dex_method_index = method->GetDexMethodIndex();
-          target_method->dex_file = method->GetDeclaringClass()->GetDexCache()->GetDexFile();
+          target_method->dex_file = dex_cache->GetDexFile();
         }
         must_use_direct_pointers = true;
       }
@@ -1330,8 +1367,7 @@ void CompilerDriver::GetCodeAndMethodForDirectCall(InvokeType* type, InvokeType
       *type = sharp_type;
     }
   } else {
-    bool method_in_image =
-        Runtime::Current()->GetHeap()->FindSpaceFromObject(method, false)->IsImageSpace();
+    bool method_in_image = heap->FindSpaceFromObject(method, false)->IsImageSpace();
     if (method_in_image || compiling_boot) {
       // We know we must be able to get to the method in the image, so use that pointer.
       CHECK(!method->IsAbstract());
@@ -2000,10 +2036,11 @@ void CompilerDriver::CompileClass(const ParallelCompilationManager* manager, siz
   const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_index);
   ClassLinker* class_linker = manager->GetClassLinker();
   jobject jclass_loader = manager->GetClassLoader();
+  Thread* self = Thread::Current();
   {
     // Use a scoped object access to perform to the quick SkipClass check.
     const char* descriptor = dex_file.GetClassDescriptor(class_def);
-    ScopedObjectAccess soa(Thread::Current());
+    ScopedObjectAccess soa(self);
     StackHandleScope<3> hs(soa.Self());
     Handle<mirror::ClassLoader> class_loader(
         hs.NewHandle(soa.Decode<mirror::ClassLoader*>(jclass_loader)));
@@ -2030,7 +2067,7 @@ void CompilerDriver::CompileClass(const ParallelCompilationManager* manager, siz
   // Can we run DEX-to-DEX compiler on this class ?
   DexToDexCompilationLevel dex_to_dex_compilation_level = kDontDexToDexCompile;
   {
-    ScopedObjectAccess soa(Thread::Current());
+    ScopedObjectAccess soa(self);
     StackHandleScope<1> hs(soa.Self());
     Handle<mirror::ClassLoader> class_loader(
         hs.NewHandle(soa.Decode<mirror::ClassLoader*>(jclass_loader)));
@@ -2061,7 +2098,7 @@ void CompilerDriver::CompileClass(const ParallelCompilationManager* manager, siz
       continue;
     }
     previous_direct_method_idx = method_idx;
-    driver->CompileMethod(it.GetMethodCodeItem(), it.GetMethodAccessFlags(),
+    driver->CompileMethod(self, it.GetMethodCodeItem(), it.GetMethodAccessFlags(),
                           it.GetMethodInvokeType(class_def), class_def_index,
                           method_idx, jclass_loader, dex_file, dex_to_dex_compilation_level,
                           compilation_enabled);
@@ -2078,7 +2115,7 @@ void CompilerDriver::CompileClass(const ParallelCompilationManager* manager, siz
       continue;
     }
     previous_virtual_method_idx = method_idx;
-    driver->CompileMethod(it.GetMethodCodeItem(), it.GetMethodAccessFlags(),
+    driver->CompileMethod(self, it.GetMethodCodeItem(), it.GetMethodAccessFlags(),
                           it.GetMethodInvokeType(class_def), class_def_index,
                           method_idx, jclass_loader, dex_file, dex_to_dex_compilation_level,
                           compilation_enabled);
@@ -2111,10 +2148,10 @@ static bool InstructionSetHasGenericJniStub(InstructionSet isa) {
   }
 }
 
-void CompilerDriver::CompileMethod(const DexFile::CodeItem* code_item, uint32_t access_flags,
-                                   InvokeType invoke_type, uint16_t class_def_idx,
-                                   uint32_t method_idx, jobject class_loader,
-                                   const DexFile& dex_file,
+void CompilerDriver::CompileMethod(Thread* self, const DexFile::CodeItem* code_item,
+                                   uint32_t access_flags, InvokeType invoke_type,
+                                   uint16_t class_def_idx, uint32_t method_idx,
+                                   jobject class_loader, const DexFile& dex_file,
                                    DexToDexCompilationLevel dex_to_dex_compilation_level,
                                    bool compilation_enabled) {
   CompiledMethod* compiled_method = nullptr;
@@ -2162,7 +2199,6 @@ void CompilerDriver::CompileMethod(const DexFile::CodeItem* code_item, uint32_t
     }
   }
 
-  Thread* self = Thread::Current();
   if (compiled_method != nullptr) {
     // Count non-relative linker patches.
     size_t non_relative_linker_patch_count = 0u;
@@ -2194,6 +2230,21 @@ void CompilerDriver::CompileMethod(const DexFile::CodeItem* code_item, uint32_t
   }
 }
 
+void CompilerDriver::RemoveCompiledMethod(const MethodReference& method_ref) {
+  CompiledMethod* compiled_method = nullptr;
+  {
+    MutexLock mu(Thread::Current(), compiled_methods_lock_);
+    auto it = compiled_methods_.find(method_ref);
+    if (it != compiled_methods_.end()) {
+      compiled_method = it->second;
+      compiled_methods_.erase(it);
+    }
+  }
+  if (compiled_method != nullptr) {
+    CompiledMethod::ReleaseSwapAllocatedCompiledMethod(this, compiled_method);
+  }
+}
+
 CompiledClass* CompilerDriver::GetCompiledClass(ClassReference ref) const {
   MutexLock mu(Thread::Current(), compiled_classes_lock_);
   ClassTable::const_iterator it = compiled_classes_.find(ref);
diff --git a/compiler/driver/compiler_driver.h b/compiler/driver/compiler_driver.h
index b756244..24b6f17 100644
--- a/compiler/driver/compiler_driver.h
+++ b/compiler/driver/compiler_driver.h
@@ -45,6 +45,10 @@
 
 namespace art {
 
+namespace mirror {
+class DexCache;
+}  // namespace mirror
+
 namespace verifier {
 class MethodVerifier;
 }  // namespace verifier
@@ -107,8 +111,11 @@ class CompilerDriver {
                   TimingLogger* timings)
       LOCKS_EXCLUDED(Locks::mutator_lock_);
 
+  CompiledMethod* CompileMethod(Thread* self, mirror::ArtMethod*)
+      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) WARN_UNUSED;
+
   // Compile a single Method.
-  void CompileOne(mirror::ArtMethod* method, TimingLogger* timings)
+  void CompileOne(Thread* self, mirror::ArtMethod* method, TimingLogger* timings)
       SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
 
   VerificationResults* GetVerificationResults() const {
@@ -172,6 +179,9 @@ class CompilerDriver {
   size_t GetNonRelativeLinkerPatchCount() const
       LOCKS_EXCLUDED(compiled_methods_lock_);
 
+  // Remove and delete a compiled method.
+  void RemoveCompiledMethod(const MethodReference& method_ref);
+
   void AddRequiresConstructorBarrier(Thread* self, const DexFile* dex_file,
                                      uint16_t class_def_index);
   bool RequiresConstructorBarrier(Thread* self, const DexFile* dex_file, uint16_t class_def_index);
@@ -226,6 +236,13 @@ class CompilerDriver {
       uint32_t field_idx, bool is_static)
     SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
 
+  // Resolve a field with a given dex file.
+  mirror::ArtField* ResolveFieldWithDexFile(
+      const ScopedObjectAccess& soa, Handle<mirror::DexCache> dex_cache,
+      Handle<mirror::ClassLoader> class_loader, const DexFile* dex_file,
+      uint32_t field_idx, bool is_static)
+    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+
   // Get declaration location of a resolved field.
   void GetResolvedFieldDexFileLocation(
       mirror::ArtField* resolved_field, const DexFile** declaring_dex_file,
@@ -235,6 +252,10 @@ class CompilerDriver {
   bool IsFieldVolatile(mirror::ArtField* field) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
   MemberOffset GetFieldOffset(mirror::ArtField* field) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
 
+  // Find a dex cache for a dex file.
+  inline mirror::DexCache* FindDexCache(const DexFile* dex_file)
+      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+
   // Can we fast-path an IGET/IPUT access to an instance field? If yes, compute the field offset.
   std::pair<bool, bool> IsFastInstanceField(
       mirror::DexCache* dex_cache, mirror::Class* referrer_class,
@@ -261,7 +282,7 @@ class CompilerDriver {
   mirror::ArtMethod* ResolveMethod(
       ScopedObjectAccess& soa, Handle<mirror::DexCache> dex_cache,
       Handle<mirror::ClassLoader> class_loader, const DexCompilationUnit* mUnit,
-      uint32_t method_idx, InvokeType invoke_type)
+      uint32_t method_idx, InvokeType invoke_type, bool check_incompatible_class_change = true)
     SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
 
   // Get declaration location of a resolved field.
@@ -295,6 +316,13 @@ class CompilerDriver {
   void ProcessedStaticField(bool resolved, bool local);
   void ProcessedInvoke(InvokeType invoke_type, int flags);
 
+  void ComputeFieldInfo(uint32_t field_idx, const DexCompilationUnit* mUnit,
+                        const ScopedObjectAccess& soa, bool is_static,
+                        mirror::ArtField** resolved_field,
+                        mirror::Class** referrer_class,
+                        mirror::DexCache** dex_cache)
+      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+
   // Can we fast path instance field access? Computes field's offset and volatility.
   bool ComputeInstanceFieldInfo(uint32_t field_idx, const DexCompilationUnit* mUnit, bool is_put,
                                 MemberOffset* field_offset, bool* is_volatile)
@@ -380,6 +408,13 @@ class CompilerDriver {
     return timings_logger_;
   }
 
+  void SetDedupeEnabled(bool dedupe_enabled) {
+    dedupe_enabled_ = dedupe_enabled;
+  }
+  bool DedupeEnabled() const {
+    return dedupe_enabled_;
+  }
+
   // Checks if class specified by type_idx is one of the image_classes_
   bool IsImageClass(const char* descriptor) const;
 
@@ -484,7 +519,7 @@ class CompilerDriver {
                       const std::vector<const DexFile*>& dex_files,
                       ThreadPool* thread_pool, TimingLogger* timings)
       LOCKS_EXCLUDED(Locks::mutator_lock_);
-  void CompileMethod(const DexFile::CodeItem* code_item, uint32_t access_flags,
+  void CompileMethod(Thread* self, const DexFile::CodeItem* code_item, uint32_t access_flags,
                      InvokeType invoke_type, uint16_t class_def_idx, uint32_t method_idx,
                      jobject class_loader, const DexFile& dex_file,
                      DexToDexCompilationLevel dex_to_dex_compilation_level,
@@ -545,6 +580,7 @@ class CompilerDriver {
   class AOTCompilationStats;
   std::unique_ptr<AOTCompilationStats> stats_;
 
+  bool dedupe_enabled_;
   bool dump_stats_;
   const bool dump_passes_;
   const std::string& dump_cfg_file_name_;
diff --git a/compiler/jit/jit_compiler.cc b/compiler/jit/jit_compiler.cc
new file mode 100644
index 0000000..b1d972e
--- /dev/null
+++ b/compiler/jit/jit_compiler.cc
@@ -0,0 +1,244 @@
+/*
+ * Copyright 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "jit_compiler.h"
+
+#include "arch/instruction_set.h"
+#include "arch/instruction_set_features.h"
+#include "compiler_callbacks.h"
+#include "dex/pass_manager.h"
+#include "dex/quick_compiler_callbacks.h"
+#include "driver/compiler_driver.h"
+#include "driver/compiler_options.h"
+#include "jit/jit.h"
+#include "jit/jit_code_cache.h"
+#include "mirror/art_method-inl.h"
+#include "oat_file-inl.h"
+#include "object_lock.h"
+#include "thread_list.h"
+#include "verifier/method_verifier-inl.h"
+
+namespace art {
+namespace jit {
+
+JitCompiler* JitCompiler::Create() {
+  return new JitCompiler();
+}
+
+extern "C" void* jit_load(CompilerCallbacks** callbacks) {
+  VLOG(jit) << "loading jit compiler";
+  auto* const jit_compiler = JitCompiler::Create();
+  CHECK(jit_compiler != nullptr);
+  *callbacks = jit_compiler->GetCompilerCallbacks();
+  VLOG(jit) << "Done loading jit compiler";
+  return jit_compiler;
+}
+
+extern "C" void jit_unload(void* handle) {
+  DCHECK(handle != nullptr);
+  delete reinterpret_cast<JitCompiler*>(handle);
+}
+
+extern "C" bool jit_compile_method(void* handle, mirror::ArtMethod* method, Thread* self)
+    SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
+  auto* jit_compiler = reinterpret_cast<JitCompiler*>(handle);
+  DCHECK(jit_compiler != nullptr);
+  return jit_compiler->CompileMethod(self, method);
+}
+
+JitCompiler::JitCompiler() : total_time_(0) {
+  auto* pass_manager_options = new PassManagerOptions;
+  pass_manager_options->SetDisablePassList("GVN,DCE");
+  compiler_options_.reset(new CompilerOptions(
+      CompilerOptions::kDefaultCompilerFilter,
+      CompilerOptions::kDefaultHugeMethodThreshold,
+      CompilerOptions::kDefaultLargeMethodThreshold,
+      CompilerOptions::kDefaultSmallMethodThreshold,
+      CompilerOptions::kDefaultTinyMethodThreshold,
+      CompilerOptions::kDefaultNumDexMethodsThreshold,
+      false,
+      false,
+      CompilerOptions::kDefaultTopKProfileThreshold,
+      false,
+      false,
+      false,
+      false,
+      true,  // pic
+      nullptr,
+      pass_manager_options,
+      nullptr));
+  const InstructionSet instruction_set = kRuntimeISA;
+  instruction_set_features_.reset(InstructionSetFeatures::FromCppDefines());
+  cumulative_logger_.reset(new CumulativeLogger("jit times"));
+  verification_results_.reset(new VerificationResults(compiler_options_.get()));
+  method_inliner_map_.reset(new DexFileToMethodInlinerMap);
+  callbacks_.reset(new QuickCompilerCallbacks(verification_results_.get(),
+                                              method_inliner_map_.get()));
+  compiler_driver_.reset(new CompilerDriver(
+      compiler_options_.get(), verification_results_.get(), method_inliner_map_.get(),
+      Compiler::kQuick, instruction_set, instruction_set_features_.get(), false,
+      nullptr, new std::set<std::string>, 1, false, true,
+      std::string(), cumulative_logger_.get(), -1, std::string()));
+  // Disable dedupe so we can remove compiled methods.
+  compiler_driver_->SetDedupeEnabled(false);
+  compiler_driver_->SetSupportBootImageFixup(false);
+}
+
+JitCompiler::~JitCompiler() {
+}
+
+bool JitCompiler::CompileMethod(Thread* self, mirror::ArtMethod* method) {
+  uint64_t start_time = NanoTime();
+  StackHandleScope<2> hs(self);
+  self->AssertNoPendingException();
+  Runtime* runtime = Runtime::Current();
+  Handle<mirror::ArtMethod> h_method(hs.NewHandle(method));
+  if (runtime->GetJit()->GetCodeCache()->ContainsMethod(method)) {
+    VLOG(jit) << "Already compiled " << PrettyMethod(method);
+    return true;  // Already compiled
+  }
+  Handle<mirror::Class> h_class(hs.NewHandle(h_method->GetDeclaringClass()));
+  if (!runtime->GetClassLinker()->EnsureInitialized(self, h_class, true, true)) {
+    VLOG(jit) << "JIT failed to initialize " << PrettyMethod(h_method.Get());
+    return false;
+  }
+  const DexFile* dex_file = h_class->GetDexCache()->GetDexFile();
+  MethodReference method_ref(dex_file, h_method->GetDexMethodIndex());
+  // Only verify if we don't already have verification results.
+  if (verification_results_->GetVerifiedMethod(method_ref) == nullptr) {
+    std::string error;
+    if (verifier::MethodVerifier::VerifyMethod(h_method.Get(), true, &error) ==
+        verifier::MethodVerifier::kHardFailure) {
+      VLOG(jit) << "Not compile method " << PrettyMethod(h_method.Get())
+          << " due to verification failure " << error;
+      return false;
+    }
+  }
+  CompiledMethod* compiled_method(compiler_driver_->CompileMethod(self, h_method.Get()));
+  if (compiled_method == nullptr) {
+    return false;
+  }
+  total_time_ += NanoTime() - start_time;
+  const bool result = MakeExecutable(compiled_method, h_method.Get());
+  // Remove the compiled method to save memory.
+  compiler_driver_->RemoveCompiledMethod(method_ref);
+  return result;
+}
+
+CompilerCallbacks* JitCompiler::GetCompilerCallbacks() const {
+  return callbacks_.get();
+}
+
+uint8_t* JitCompiler::WriteMethodHeaderAndCode(const CompiledMethod* compiled_method,
+                                               uint8_t* reserve_begin, uint8_t* reserve_end,
+                                               const uint8_t* mapping_table,
+                                               const uint8_t* vmap_table,
+                                               const uint8_t* gc_map) {
+  reserve_begin += sizeof(OatQuickMethodHeader);
+  reserve_begin = reinterpret_cast<uint8_t*>(
+      compiled_method->AlignCode(reinterpret_cast<uintptr_t>(reserve_begin)));
+  const auto* quick_code = compiled_method->GetQuickCode();
+  CHECK_LE(reserve_begin, reserve_end);
+  CHECK_LE(quick_code->size(), static_cast<size_t>(reserve_end - reserve_begin));
+  auto* code_ptr = reserve_begin;
+  OatQuickMethodHeader* method_header = reinterpret_cast<OatQuickMethodHeader*>(code_ptr) - 1;
+  // Construct the header last.
+  const auto frame_size_in_bytes = compiled_method->GetFrameSizeInBytes();
+  const auto core_spill_mask = compiled_method->GetCoreSpillMask();
+  const auto fp_spill_mask = compiled_method->GetFpSpillMask();
+  const auto code_size = quick_code->size();
+  CHECK_NE(code_size, 0U);
+  std::copy(quick_code->data(), quick_code->data() + code_size, code_ptr);
+  // After we are done writing we need to update the method header.
+  // Write out the method header last.
+  method_header = new(method_header)OatQuickMethodHeader(
+      code_ptr - mapping_table, code_ptr - vmap_table, code_ptr - gc_map, frame_size_in_bytes,
+      core_spill_mask, fp_spill_mask, code_size);
+  // Return the code ptr.
+  return code_ptr;
+}
+
+bool JitCompiler::AddToCodeCache(mirror::ArtMethod* method, const CompiledMethod* compiled_method,
+                                 OatFile::OatMethod* out_method) {
+  Runtime* runtime = Runtime::Current();
+  JitCodeCache* const code_cache = runtime->GetJit()->GetCodeCache();
+  const auto* quick_code = compiled_method->GetQuickCode();
+  if (quick_code == nullptr) {
+    return false;
+  }
+  const auto code_size = quick_code->size();
+  Thread* const self = Thread::Current();
+  const uint8_t* base = code_cache->CodeCachePtr();
+  auto* const mapping_table = compiled_method->GetMappingTable();
+  auto* const vmap_table = compiled_method->GetVmapTable();
+  auto* const gc_map = compiled_method->GetGcMap();
+  // Write out pre-header stuff.
+  uint8_t* const mapping_table_ptr = code_cache->AddDataArray(
+      self, mapping_table->data(), mapping_table->data() + mapping_table->size());
+  if (mapping_table == nullptr) {
+    return false;  // Out of data cache.
+  }
+  uint8_t* const vmap_table_ptr = code_cache->AddDataArray(
+      self, vmap_table->data(), vmap_table->data() + vmap_table->size());
+  if (vmap_table == nullptr) {
+    return false;  // Out of data cache.
+  }
+  uint8_t* const gc_map_ptr = code_cache->AddDataArray(
+      self, gc_map->data(), gc_map->data() + gc_map->size());
+  if (gc_map == nullptr) {
+    return false;  // Out of data cache.
+  }
+  // Don't touch this until you protect / unprotect the code.
+  const size_t reserve_size = sizeof(OatQuickMethodHeader) + quick_code->size() + 32;
+  uint8_t* const code_reserve = code_cache->ReserveCode(self, reserve_size);
+  if (code_reserve == nullptr) {
+    return false;
+  }
+  auto* code_ptr = WriteMethodHeaderAndCode(
+      compiled_method, code_reserve, code_reserve + reserve_size, mapping_table_ptr,
+      vmap_table_ptr, gc_map_ptr);
+
+  const size_t thumb_offset = compiled_method->CodeDelta();
+  const uint32_t code_offset = code_ptr - base + thumb_offset;
+  *out_method = OatFile::OatMethod(base, code_offset);
+  DCHECK_EQ(out_method->GetGcMap(), gc_map_ptr);
+  DCHECK_EQ(out_method->GetMappingTable(), mapping_table_ptr);
+  DCHECK_EQ(out_method->GetVmapTable(), vmap_table_ptr);
+  DCHECK_EQ(out_method->GetFrameSizeInBytes(), compiled_method->GetFrameSizeInBytes());
+  DCHECK_EQ(out_method->GetCoreSpillMask(), compiled_method->GetCoreSpillMask());
+  DCHECK_EQ(out_method->GetFpSpillMask(), compiled_method->GetFpSpillMask());
+  VLOG(jit)  << "JIT added " << PrettyMethod(method) << "@" << method << " ccache_size="
+      << PrettySize(code_cache->CodeCacheSize()) << ": " << reinterpret_cast<void*>(code_ptr)
+      << "," << reinterpret_cast<void*>(code_ptr + code_size);
+  return true;
+}
+
+bool JitCompiler::MakeExecutable(CompiledMethod* compiled_method, mirror::ArtMethod* method) {
+  CHECK(method != nullptr);
+  CHECK(compiled_method != nullptr);
+  OatFile::OatMethod oat_method(nullptr, 0);
+  if (!AddToCodeCache(method, compiled_method, &oat_method)) {
+    return false;
+  }
+  // TODO: Flush instruction cache.
+  oat_method.LinkMethod(method);
+  CHECK(Runtime::Current()->GetJit()->GetCodeCache()->ContainsMethod(method))
+      << PrettyMethod(method);
+  return true;
+}
+
+}  // namespace jit
+}  // namespace art
diff --git a/compiler/jit/jit_compiler.h b/compiler/jit/jit_compiler.h
new file mode 100644
index 0000000..0876499
--- /dev/null
+++ b/compiler/jit/jit_compiler.h
@@ -0,0 +1,76 @@
+/*
+ * Copyright 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ART_COMPILER_JIT_JIT_COMPILER_H_
+#define ART_COMPILER_JIT_JIT_COMPILER_H_
+
+#include "base/mutex.h"
+#include "compiler_callbacks.h"
+#include "compiled_method.h"
+#include "dex/verification_results.h"
+#include "dex/quick/dex_file_to_method_inliner_map.h"
+#include "driver/compiler_driver.h"
+#include "driver/compiler_options.h"
+#include "oat_file.h"
+
+namespace art {
+
+class InstructionSetFeatures;
+
+namespace mirror {
+class ArtMethod;
+}
+
+namespace jit {
+
+class JitCompiler {
+ public:
+  static JitCompiler* Create();
+  virtual ~JitCompiler();
+  bool CompileMethod(Thread* self, mirror::ArtMethod* method)
+      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+  // This is in the compiler since the runtime doesn't have access to the compiled method
+  // structures.
+  bool AddToCodeCache(mirror::ArtMethod* method, const CompiledMethod* compiled_method,
+                      OatFile::OatMethod* out_method) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+  CompilerCallbacks* GetCompilerCallbacks() const;
+  size_t GetTotalCompileTime() const {
+    return total_time_;
+  }
+
+ private:
+  uint64_t total_time_;
+  std::unique_ptr<CompilerOptions> compiler_options_;
+  std::unique_ptr<CumulativeLogger> cumulative_logger_;
+  std::unique_ptr<VerificationResults> verification_results_;
+  std::unique_ptr<DexFileToMethodInlinerMap> method_inliner_map_;
+  std::unique_ptr<CompilerCallbacks> callbacks_;
+  std::unique_ptr<CompilerDriver> compiler_driver_;
+  std::unique_ptr<const InstructionSetFeatures> instruction_set_features_;
+
+  explicit JitCompiler();
+  uint8_t* WriteMethodHeaderAndCode(
+      const CompiledMethod* compiled_method, uint8_t* reserve_begin, uint8_t* reserve_end,
+      const uint8_t* mapping_table, const uint8_t* vmap_table, const uint8_t* gc_map);
+  bool MakeExecutable(CompiledMethod* compiled_method, mirror::ArtMethod* method)
+      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+};
+
+}  // namespace jit
+
+}  // namespace art
+
+#endif  // ART_COMPILER_JIT_JIT_COMPILER_H_
diff --git a/compiler/oat_writer.cc b/compiler/oat_writer.cc
index 9c0157e..8411091 100644
--- a/compiler/oat_writer.cc
+++ b/compiler/oat_writer.cc
@@ -549,7 +549,7 @@ struct OatWriter::MappingTableDataAccess {
 
 struct OatWriter::VmapTableDataAccess {
   static const SwapVector<uint8_t>* GetData(const CompiledMethod* compiled_method) ALWAYS_INLINE {
-    return &compiled_method->GetVmapTable();
+    return compiled_method->GetVmapTable();
   }
 
   static uint32_t GetOffset(OatClass* oat_class, size_t method_offsets_index) ALWAYS_INLINE {
diff --git a/compiler/oat_writer.h b/compiler/oat_writer.h
index e020d31..980611f 100644
--- a/compiler/oat_writer.h
+++ b/compiler/oat_writer.h
@@ -341,8 +341,8 @@ class OatWriter {
       if (UNLIKELY(lhs->GetMappingTable() != rhs->GetMappingTable())) {
         return lhs->GetMappingTable() < rhs->GetMappingTable();
       }
-      if (UNLIKELY(&lhs->GetVmapTable() != &rhs->GetVmapTable())) {
-        return &lhs->GetVmapTable() < &rhs->GetVmapTable();
+      if (UNLIKELY(lhs->GetVmapTable() != rhs->GetVmapTable())) {
+        return lhs->GetVmapTable() < rhs->GetVmapTable();
       }
       if (UNLIKELY(lhs->GetGcMap() != rhs->GetGcMap())) {
         return lhs->GetGcMap() < rhs->GetGcMap();
diff --git a/runtime/Android.mk b/runtime/Android.mk
index c647cc2..ab346e3 100644
--- a/runtime/Android.mk
+++ b/runtime/Android.mk
@@ -88,6 +88,9 @@ LIBART_COMMON_SRC_FILES := \
   jdwp/jdwp_socket.cc \
   jdwp/object_registry.cc \
   jni_env_ext.cc \
+  jit/jit.cc \
+  jit/jit_code_cache.cc \
+  jit/jit_instrumentation.cc \
   jni_internal.cc \
   jobject_comparator.cc \
   mem_map.cc \
@@ -298,6 +301,7 @@ LIBART_ENUM_OPERATOR_OUT_HEADER_FILES := \
   base/unix_file/fd_file.h \
   dex_file.h \
   dex_instruction.h \
+  dex_instruction_utils.h \
   gc_root.h \
   gc/allocator/rosalloc.h \
   gc/collector/gc_type.h \
diff --git a/runtime/base/logging.h b/runtime/base/logging.h
index cc1a4a1..3d007ba 100644
--- a/runtime/base/logging.h
+++ b/runtime/base/logging.h
@@ -42,6 +42,7 @@ struct LogVerbosity {
   bool gc;
   bool heap;
   bool jdwp;
+  bool jit;
   bool jni;
   bool monitor;
   bool profiler;
diff --git a/runtime/base/mutex.h b/runtime/base/mutex.h
index 745b209..45d2347 100644
--- a/runtime/base/mutex.h
+++ b/runtime/base/mutex.h
@@ -67,6 +67,7 @@ enum LockLevel {
   kReferenceQueueWeakReferencesLock,
   kReferenceQueueClearedReferencesLock,
   kReferenceProcessorLock,
+  kJitCodeCacheLock,
   kRosAllocGlobalLock,
   kRosAllocBracketLock,
   kRosAllocBulkFreeLock,
diff --git a/runtime/class_linker.cc b/runtime/class_linker.cc
index 3278751..f28253a 100644
--- a/runtime/class_linker.cc
+++ b/runtime/class_linker.cc
@@ -43,6 +43,8 @@
 #include "handle_scope.h"
 #include "intern_table.h"
 #include "interpreter/interpreter.h"
+#include "jit/jit.h"
+#include "jit/jit_code_cache.h"
 #include "leb128.h"
 #include "oat.h"
 #include "oat_file.h"
@@ -91,15 +93,14 @@ static void ThrowEarlierClassFailure(mirror::Class* c)
   // a NoClassDefFoundError (v2 2.17.5).  The exception to this rule is if we
   // failed in verification, in which case v2 5.4.1 says we need to re-throw
   // the previous error.
-  Runtime* runtime = Runtime::Current();
-  bool is_compiler = runtime->IsCompiler();
-  if (!is_compiler) {  // Give info if this occurs at runtime.
+  Runtime* const runtime = Runtime::Current();
+  if (!runtime->IsAotCompiler()) {  // Give info if this occurs at runtime.
     LOG(INFO) << "Rejecting re-init on previously-failed class " << PrettyClass(c);
   }
 
   CHECK(c->IsErroneous()) << PrettyClass(c) << " " << c->GetStatus();
   Thread* self = Thread::Current();
-  if (is_compiler) {
+  if (runtime->IsAotCompiler()) {
     // At compile time, accurate errors and NCDFE are disabled to speed compilation.
     mirror::Throwable* pre_allocated = runtime->GetPreAllocatedNoClassDefFoundError();
     self->SetException(ThrowLocation(), pre_allocated);
@@ -428,7 +429,7 @@ void ClassLinker::InitWithoutImage(std::vector<std::unique_ptr<const DexFile>> b
   // Set up GenericJNI entrypoint. That is mainly a hack for common_compiler_test.h so that
   // we do not need friend classes or a publicly exposed setter.
   quick_generic_jni_trampoline_ = GetQuickGenericJniStub();
-  if (!runtime->IsCompiler()) {
+  if (!runtime->IsAotCompiler()) {
     // We need to set up the generic trampolines since we don't have an image.
     quick_resolution_trampoline_ = GetQuickResolutionStub();
     quick_imt_conflict_trampoline_ = GetQuickImtConflictStub();
@@ -1037,8 +1038,7 @@ const OatFile* ClassLinker::FindOatFileInOatLocationForDexFile(const char* dex_l
                                                                const char* oat_location,
                                                                std::string* error_msg) {
   std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, nullptr, nullptr,
-                                            !Runtime::Current()->IsCompiler(),
-                                            error_msg));
+                                                  !Runtime::Current()->IsAotCompiler(), error_msg));
   if (oat_file.get() == nullptr) {
     *error_msg = StringPrintf("Failed to find existing oat file at %s: %s", oat_location,
                               error_msg->c_str());
@@ -1109,8 +1109,8 @@ const OatFile* ClassLinker::CreateOatFileForDexLocation(const char* dex_location
     return nullptr;
   }
   std::unique_ptr<OatFile> oat_file(OatFile::Open(oat_location, oat_location, nullptr, nullptr,
-                                            !Runtime::Current()->IsCompiler(),
-                                            &error_msg));
+                                                  !Runtime::Current()->IsAotCompiler(),
+                                                  &error_msg));
   if (oat_file.get() == nullptr) {
     std::string compound_msg = StringPrintf("\nFailed to open generated oat file '%s': %s",
                                             oat_location, error_msg.c_str());
@@ -1350,7 +1350,7 @@ const OatFile* ClassLinker::OpenOatFileFromDexLocation(const std::string& dex_lo
   *already_opened = false;
   const Runtime* runtime = Runtime::Current();
   CHECK(runtime != nullptr);
-  bool executable = !runtime->IsCompiler();
+  bool executable = !runtime->IsAotCompiler();
 
   std::string odex_error_msg;
   bool should_patch_system = false;
@@ -1518,7 +1518,7 @@ const OatFile* ClassLinker::PatchAndRetrieveOat(const std::string& input_oat,
   bool success = Exec(argv, error_msg);
   if (success) {
     std::unique_ptr<OatFile> output(OatFile::Open(output_oat, output_oat, nullptr, nullptr,
-                                                  !runtime->IsCompiler(), error_msg));
+                                                  !runtime->IsAotCompiler(), error_msg));
     bool checksum_verified = false;
     if (output.get() != nullptr && CheckOatFile(runtime, output.get(), isa, &checksum_verified,
                                                 error_msg)) {
@@ -1532,7 +1532,7 @@ const OatFile* ClassLinker::PatchAndRetrieveOat(const std::string& input_oat,
                                 "but was unable to open output file '%s': %s",
                                 input_oat.c_str(), output_oat.c_str(), error_msg->c_str());
     }
-  } else if (!runtime->IsCompiler()) {
+  } else if (!runtime->IsAotCompiler()) {
     // patchoat failed which means we probably don't have enough room to place the output oat file,
     // instead of failing we should just run the interpreter from the dex files in the input oat.
     LOG(WARNING) << "Patching of oat file '" << input_oat << "' failed. Attempting to use oat file "
@@ -1619,22 +1619,20 @@ const OatFile* ClassLinker::FindOatFileFromOatLocation(const std::string& oat_lo
   if (oat_file != nullptr) {
     return oat_file;
   }
-
-  return OatFile::Open(oat_location, oat_location, nullptr, nullptr, !Runtime::Current()->IsCompiler(),
-                       error_msg);
+  return OatFile::Open(oat_location, oat_location, nullptr, nullptr,
+                       !Runtime::Current()->IsAotCompiler(), error_msg);
 }
 
 void ClassLinker::InitFromImageInterpretOnlyCallback(mirror::Object* obj, void* arg) {
   ClassLinker* class_linker = reinterpret_cast<ClassLinker*>(arg);
   DCHECK(obj != nullptr);
   DCHECK(class_linker != nullptr);
-  size_t pointer_size = class_linker->image_pointer_size_;
-
   if (obj->IsArtMethod()) {
     mirror::ArtMethod* method = obj->AsArtMethod();
     if (!method->IsNative()) {
+      const size_t pointer_size = class_linker->image_pointer_size_;
       method->SetEntryPointFromInterpreterPtrSize(artInterpreterToInterpreterBridge, pointer_size);
-      if (method != Runtime::Current()->GetResolutionMethod()) {
+      if (!method->IsRuntimeMethod() && method != Runtime::Current()->GetResolutionMethod()) {
         method->SetEntryPointFromQuickCompiledCodePtrSize(GetQuickToInterpreterBridge(),
                                                           pointer_size);
       }
@@ -1703,8 +1701,8 @@ void ClassLinker::InitFromImage() {
   // bitmap walk.
   mirror::ArtMethod::SetClass(GetClassRoot(kJavaLangReflectArtMethod));
   size_t art_method_object_size = mirror::ArtMethod::GetJavaLangReflectArtMethod()->GetObjectSize();
-  if (!Runtime::Current()->IsCompiler()) {
-    // Compiler supports having an image with a different pointer size than the runtime. This
+  if (!Runtime::Current()->IsAotCompiler()) {
+    // Aot compiler supports having an image with a different pointer size than the runtime. This
     // happens on the host for compile 32 bit tests since we use a 64 bit libart compiler. We may
     // also use 32 bit dex2oat on a system with 64 bit apps.
     CHECK_EQ(art_method_object_size, mirror::ArtMethod::InstanceSize(sizeof(void*)))
@@ -1719,7 +1717,7 @@ void ClassLinker::InitFromImage() {
 
   // Set entry point to interpreter if in InterpretOnly mode.
   Runtime* runtime = Runtime::Current();
-  if (!runtime->IsCompiler() && runtime->GetInstrumentation()->InterpretOnly()) {
+  if (!runtime->IsAotCompiler() && runtime->GetInstrumentation()->InterpretOnly()) {
     heap->VisitObjects(InitFromImageInterpretOnlyCallback, this);
   }
 
@@ -2522,31 +2520,44 @@ const void* ClassLinker::GetQuickOatCodeFor(mirror::ArtMethod* method) {
     return GetQuickProxyInvokeHandler();
   }
   bool found;
+  jit::Jit* const jit = Runtime::Current()->GetJit();
+  if (jit != nullptr) {
+    auto* code = jit->GetCodeCache()->GetCodeFor(method);
+    if (code != nullptr) {
+      return code;
+    }
+  }
   OatFile::OatMethod oat_method = FindOatMethodFor(method, &found);
-  const void* result = nullptr;
   if (found) {
-    result = oat_method.GetQuickCode();
-  }
-
-  if (result == nullptr) {
-    if (method->IsNative()) {
-      // No code and native? Use generic trampoline.
-      result = GetQuickGenericJniStub();
-    } else {
-      // No code? You must mean to go into the interpreter.
-      result = GetQuickToInterpreterBridge();
+    auto* code = oat_method.GetQuickCode();
+    if (code != nullptr) {
+      return code;
     }
   }
-  return result;
+  if (method->IsNative()) {
+    // No code and native? Use generic trampoline.
+    return GetQuickGenericJniStub();
+  }
+  return GetQuickToInterpreterBridge();
 }
 
 const void* ClassLinker::GetOatMethodQuickCodeFor(mirror::ArtMethod* method) {
   if (method->IsNative() || method->IsAbstract() || method->IsProxyMethod()) {
     return nullptr;
   }
+  jit::Jit* jit = Runtime::Current()->GetJit();
+  if (jit != nullptr) {
+    auto* code = jit->GetCodeCache()->GetCodeFor(method);
+    if (code != nullptr) {
+      return code;
+    }
+  }
   bool found;
   OatFile::OatMethod oat_method = FindOatMethodFor(method, &found);
-  return found ? oat_method.GetQuickCode() : nullptr;
+  if (found) {
+    return oat_method.GetQuickCode();
+  }
+  return nullptr;
 }
 
 const void* ClassLinker::GetQuickOatCodeFor(const DexFile& dex_file, uint16_t class_def_idx,
@@ -2582,7 +2593,7 @@ void ClassLinker::FixupStaticTrampolines(mirror::Class* klass) {
   }
   Runtime* runtime = Runtime::Current();
   if (!runtime->IsStarted() || runtime->UseCompileTimeClassPath()) {
-    if (runtime->IsCompiler() || runtime->GetHeap()->HasImageSpace()) {
+    if (runtime->IsAotCompiler() || runtime->GetHeap()->HasImageSpace()) {
       return;  // OAT file unavailable.
     }
   }
@@ -2635,7 +2646,7 @@ void ClassLinker::LinkCode(Handle<mirror::ArtMethod> method,
                            const OatFile::OatClass* oat_class,
                            uint32_t class_def_method_index) {
   Runtime* runtime = Runtime::Current();
-  if (runtime->IsCompiler()) {
+  if (runtime->IsAotCompiler()) {
     // The following code only applies to a non-compiler runtime.
     return;
   }
@@ -3474,7 +3485,7 @@ void ClassLinker::VerifyClass(Thread* self, Handle<mirror::Class> klass) {
     EnsurePreverifiedMethods(klass);
     return;
   }
-  if (klass->IsCompileTimeVerified() && Runtime::Current()->IsCompiler()) {
+  if (klass->IsCompileTimeVerified() && Runtime::Current()->IsAotCompiler()) {
     return;
   }
 
@@ -3490,7 +3501,7 @@ void ClassLinker::VerifyClass(Thread* self, Handle<mirror::Class> klass) {
   } else {
     CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime)
         << PrettyClass(klass.Get());
-    CHECK(!Runtime::Current()->IsCompiler());
+    CHECK(!Runtime::Current()->IsAotCompiler());
     klass->SetStatus(mirror::Class::kStatusVerifyingAtRuntime, self);
   }
 
@@ -3526,7 +3537,7 @@ void ClassLinker::VerifyClass(Thread* self, Handle<mirror::Class> klass) {
         self->GetException(nullptr)->SetCause(cause.Get());
       }
       ClassReference ref(klass->GetDexCache()->GetDexFile(), klass->GetDexClassDefIndex());
-      if (Runtime::Current()->IsCompiler()) {
+      if (Runtime::Current()->IsAotCompiler()) {
         Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref);
       }
       klass->SetStatus(mirror::Class::kStatusError, self);
@@ -3551,7 +3562,7 @@ void ClassLinker::VerifyClass(Thread* self, Handle<mirror::Class> klass) {
   std::string error_msg;
   if (!preverified) {
     verifier_failure = verifier::MethodVerifier::VerifyClass(self, klass.Get(),
-                                                             Runtime::Current()->IsCompiler(),
+                                                             Runtime::Current()->IsAotCompiler(),
                                                              &error_msg);
   }
   if (preverified || verifier_failure != verifier::MethodVerifier::kHardFailure) {
@@ -3579,7 +3590,7 @@ void ClassLinker::VerifyClass(Thread* self, Handle<mirror::Class> klass) {
       // Soft failures at compile time should be retried at runtime. Soft
       // failures at runtime will be handled by slow paths in the generated
       // code. Set status accordingly.
-      if (Runtime::Current()->IsCompiler()) {
+      if (Runtime::Current()->IsAotCompiler()) {
         klass->SetStatus(mirror::Class::kStatusRetryVerificationAtRuntime, self);
       } else {
         klass->SetStatus(mirror::Class::kStatusVerified, self);
@@ -3620,7 +3631,7 @@ bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class
   // we are not compiling the image or if the class we're verifying is not part of
   // the app.  In other words, we will only check for preverification of bootclasspath
   // classes.
-  if (Runtime::Current()->IsCompiler()) {
+  if (Runtime::Current()->IsAotCompiler()) {
     // Are we compiling the bootclasspath?
     if (!Runtime::Current()->UseCompileTimeClassPath()) {
       return false;
@@ -3646,7 +3657,7 @@ bool ClassLinker::VerifyClassUsingOatFile(const DexFile& dex_file, mirror::Class
   // image (that we just failed loading), and the verifier can't be run on quickened opcodes when
   // the runtime isn't started. On the other hand, app classes can be re-verified even if they are
   // already pre-opted, as then the runtime is started.
-  if (!Runtime::Current()->IsCompiler() &&
+  if (!Runtime::Current()->IsAotCompiler() &&
       !Runtime::Current()->GetHeap()->HasImageSpace() &&
       klass->GetClassLoader() != nullptr) {
     return false;
@@ -4094,7 +4105,7 @@ bool ClassLinker::InitializeClass(Thread* self, Handle<mirror::Class> klass,
           CHECK(self->IsExceptionPending());
           VlogClassInitializationFailure(klass);
         } else {
-          CHECK(Runtime::Current()->IsCompiler());
+          CHECK(Runtime::Current()->IsAotCompiler());
           CHECK_EQ(klass->GetStatus(), mirror::Class::kStatusRetryVerificationAtRuntime);
         }
         return false;
@@ -4275,7 +4286,8 @@ bool ClassLinker::WaitForInitializeClass(Handle<mirror::Class> klass, Thread* se
     if (klass->GetStatus() == mirror::Class::kStatusInitializing) {
       continue;
     }
-    if (klass->GetStatus() == mirror::Class::kStatusVerified && Runtime::Current()->IsCompiler()) {
+    if (klass->GetStatus() == mirror::Class::kStatusVerified &&
+        Runtime::Current()->IsAotCompiler()) {
       // Compile time initialization failed.
       return false;
     }
diff --git a/runtime/debugger.cc b/runtime/debugger.cc
index a3d3b47..f33c0f8 100644
--- a/runtime/debugger.cc
+++ b/runtime/debugger.cc
@@ -287,6 +287,13 @@ class DebugInstrumentationListener FINAL : public instrumentation::Instrumentati
     Dbg::PostException(throw_location, catch_method, catch_dex_pc, exception_object);
   }
 
+  // We only care about how many backward branches were executed in the Jit.
+  void BackwardBranch(Thread* /*thread*/, mirror::ArtMethod* method, int32_t dex_pc_offset)
+      OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
+    LOG(ERROR) << "Unexpected backward branch event in debugger " << PrettyMethod(method)
+               << " " << dex_pc_offset;
+  }
+
  private:
   DISALLOW_COPY_AND_ASSIGN(DebugInstrumentationListener);
 } gDebugInstrumentationListener;
diff --git a/runtime/dex_file.h b/runtime/dex_file.h
index e121a08..c8ede48 100644
--- a/runtime/dex_file.h
+++ b/runtime/dex_file.h
@@ -1028,6 +1028,13 @@ class DexFile {
   // from an oat file, e.g., directly from an apk.
   const OatFile* oat_file_;
 };
+
+struct DexFileReference {
+  DexFileReference(const DexFile* file, uint32_t idx) : dex_file(file), index(idx) { }
+  const DexFile* dex_file;
+  uint32_t index;
+};
+
 std::ostream& operator<<(std::ostream& os, const DexFile& dex_file);
 
 // Iterate over a dex file's ProtoId's paramters
diff --git a/compiler/utils/dex_instruction_utils.h b/runtime/dex_instruction_utils.h
index bb2c592..1a671c5 100644
--- a/compiler/utils/dex_instruction_utils.h
+++ b/runtime/dex_instruction_utils.h
@@ -14,8 +14,8 @@
  * limitations under the License.
  */
 
-#ifndef ART_COMPILER_UTILS_DEX_INSTRUCTION_UTILS_H_
-#define ART_COMPILER_UTILS_DEX_INSTRUCTION_UTILS_H_
+#ifndef ART_RUNTIME_DEX_INSTRUCTION_UTILS_H_
+#define ART_RUNTIME_DEX_INSTRUCTION_UTILS_H_
 
 #include "dex_instruction.h"
 
@@ -58,6 +58,11 @@ constexpr bool IsInstructionInvoke(Instruction::Code opcode) {
       opcode != Instruction::RETURN_VOID_BARRIER;
 }
 
+constexpr bool IsInstructionQuickInvoke(Instruction::Code opcode) {
+  return opcode == Instruction::INVOKE_VIRTUAL_QUICK ||
+      opcode == Instruction::INVOKE_VIRTUAL_RANGE_QUICK;
+}
+
 constexpr bool IsInstructionInvokeStatic(Instruction::Code opcode) {
   return opcode == Instruction::INVOKE_STATIC || opcode == Instruction::INVOKE_STATIC_RANGE;
 }
@@ -102,6 +107,11 @@ constexpr bool IsInstructionIGetOrIPut(Instruction::Code code) {
   return Instruction::IGET <= code && code <= Instruction::IPUT_SHORT;
 }
 
+constexpr bool IsInstructionIGetQuickOrIPutQuick(Instruction::Code code) {
+  return (code >= Instruction::IGET_QUICK && code <= Instruction::IPUT_OBJECT_QUICK) ||
+      (code >= Instruction::IPUT_BOOLEAN_QUICK && code <= Instruction::IGET_SHORT_QUICK);
+}
+
 constexpr bool IsInstructionSGetOrSPut(Instruction::Code code) {
   return Instruction::SGET <= code && code <= Instruction::SPUT_SHORT;
 }
@@ -181,6 +191,29 @@ constexpr DexMemAccessType IGetOrIPutMemAccessType(Instruction::Code code) {
   return (code >= Instruction::IPUT) ? IPutMemAccessType(code) : IGetMemAccessType(code);
 }
 
+static inline DexMemAccessType IGetQuickOrIPutQuickMemAccessType(Instruction::Code code) {
+  DCHECK(IsInstructionIGetQuickOrIPutQuick(code));
+  switch (code) {
+    case Instruction::IGET_QUICK: case Instruction::IPUT_QUICK:
+      return kDexMemAccessWord;
+    case Instruction::IGET_WIDE_QUICK: case Instruction::IPUT_WIDE_QUICK:
+      return kDexMemAccessWide;
+    case Instruction::IGET_OBJECT_QUICK: case Instruction::IPUT_OBJECT_QUICK:
+      return kDexMemAccessObject;
+    case Instruction::IGET_BOOLEAN_QUICK: case Instruction::IPUT_BOOLEAN_QUICK:
+      return kDexMemAccessBoolean;
+    case Instruction::IGET_BYTE_QUICK: case Instruction::IPUT_BYTE_QUICK:
+      return kDexMemAccessByte;
+    case Instruction::IGET_CHAR_QUICK: case Instruction::IPUT_CHAR_QUICK:
+      return kDexMemAccessChar;
+    case Instruction::IGET_SHORT_QUICK: case Instruction::IPUT_SHORT_QUICK:
+      return kDexMemAccessShort;
+    default:
+      LOG(FATAL) << code;
+      UNREACHABLE();
+  }
+}
+
 constexpr DexMemAccessType SGetOrSPutMemAccessType(Instruction::Code code) {
 #if __cplusplus >= 201402  // C++14 allows the DCHECK() in constexpr functions.
   DCHECK(IsInstructionSGetOrSPut(opcode));
@@ -197,4 +230,4 @@ constexpr DexMemAccessType AGetOrAPutMemAccessType(Instruction::Code code) {
 
 }  // namespace art
 
-#endif  // ART_COMPILER_UTILS_DEX_INSTRUCTION_UTILS_H_
+#endif  // ART_RUNTIME_DEX_INSTRUCTION_UTILS_H_
diff --git a/runtime/gc/heap.cc b/runtime/gc/heap.cc
index 419d555..9e159c2 100644
--- a/runtime/gc/heap.cc
+++ b/runtime/gc/heap.cc
@@ -655,7 +655,7 @@ void Heap::DumpObject(std::ostream& stream, mirror::Object* obj) {
 }
 
 bool Heap::IsCompilingBoot() const {
-  if (!Runtime::Current()->IsCompiler()) {
+  if (!Runtime::Current()->IsAotCompiler()) {
     return false;
   }
   for (const auto& space : continuous_spaces_) {
diff --git a/runtime/gc/space/image_space.cc b/runtime/gc/space/image_space.cc
index d873e6d..14f770d 100644
--- a/runtime/gc/space/image_space.cc
+++ b/runtime/gc/space/image_space.cc
@@ -788,7 +788,7 @@ OatFile* ImageSpace::OpenOatFile(const char* image_path, std::string* error_msg)
 
   OatFile* oat_file = OatFile::Open(oat_filename, oat_filename, image_header.GetOatDataBegin(),
                                     image_header.GetOatFileBegin(),
-                                    !Runtime::Current()->IsCompiler(), error_msg);
+                                    !Runtime::Current()->IsAotCompiler(), error_msg);
   if (oat_file == NULL) {
     *error_msg = StringPrintf("Failed to open oat file '%s' referenced from image %s: %s",
                               oat_filename.c_str(), GetName(), error_msg->c_str());
diff --git a/runtime/instrumentation.cc b/runtime/instrumentation.cc
index 90115c3..a054462 100644
--- a/runtime/instrumentation.cc
+++ b/runtime/instrumentation.cc
@@ -31,6 +31,8 @@
 #include "entrypoints/runtime_asm_entrypoints.h"
 #include "gc_root-inl.h"
 #include "interpreter/interpreter.h"
+#include "jit/jit.h"
+#include "jit/jit_code_cache.h"
 #include "mirror/art_method-inl.h"
 #include "mirror/class-inl.h"
 #include "mirror/dex_cache.h"
@@ -92,6 +94,16 @@ void Instrumentation::InstallStubsForClass(mirror::Class* klass) {
 
 static void UpdateEntrypoints(mirror::ArtMethod* method, const void* quick_code)
     SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
+  Runtime* const runtime = Runtime::Current();
+  jit::Jit* jit = runtime->GetJit();
+  if (jit != nullptr) {
+    const void* old_code_ptr = method->GetEntryPointFromQuickCompiledCode();
+    jit::JitCodeCache* code_cache = jit->GetCodeCache();
+    if (code_cache->ContainsCodePtr(old_code_ptr)) {
+      // Save the old compiled code since we need it to implement ClassLinker::GetQuickOatCodeFor.
+      code_cache->SaveCompiledCode(method, old_code_ptr);
+    }
+  }
   method->SetEntryPointFromQuickCompiledCode(quick_code);
   if (!method->IsResolutionMethod()) {
     ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
@@ -120,7 +132,8 @@ void Instrumentation::InstallStubsForMethod(mirror::ArtMethod* method) {
   }
   const void* new_quick_code;
   bool uninstall = !entry_exit_stubs_installed_ && !interpreter_stubs_installed_;
-  ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
+  Runtime* const runtime = Runtime::Current();
+  ClassLinker* const class_linker = runtime->GetClassLinker();
   bool is_class_initialized = method->GetDeclaringClass()->IsInitialized();
   if (uninstall) {
     if ((forced_interpret_only_ || IsDeoptimized(method)) && !method->IsNative()) {
@@ -143,7 +156,6 @@ void Instrumentation::InstallStubsForMethod(mirror::ArtMethod* method) {
           new_quick_code = GetQuickInstrumentationEntryPoint();
         } else {
           new_quick_code = class_linker->GetQuickOatCodeFor(method);
-          DCHECK(!class_linker->IsQuickToInterpreterBridge(new_quick_code));
         }
       } else {
         new_quick_code = GetQuickResolutionStub();
@@ -397,6 +409,10 @@ void Instrumentation::AddListener(InstrumentationListener* listener, uint32_t ev
     method_unwind_listeners_.push_back(listener);
     have_method_unwind_listeners_ = true;
   }
+  if ((events & kBackwardBranch) != 0) {
+    backward_branch_listeners_.push_back(listener);
+    have_backward_branch_listeners_ = true;
+  }
   if ((events & kDexPcMoved) != 0) {
     std::list<InstrumentationListener*>* modified;
     if (have_dex_pc_listeners_) {
@@ -904,6 +920,13 @@ void Instrumentation::DexPcMovedEventImpl(Thread* thread, mirror::Object* this_o
   }
 }
 
+void Instrumentation::BackwardBranchImpl(Thread* thread, mirror::ArtMethod* method,
+                                         int32_t offset) const {
+  for (InstrumentationListener* listener : backward_branch_listeners_) {
+    listener->BackwardBranch(thread, method, offset);
+  }
+}
+
 void Instrumentation::FieldReadEventImpl(Thread* thread, mirror::Object* this_object,
                                          mirror::ArtMethod* method, uint32_t dex_pc,
                                          mirror::ArtField* field) const {
diff --git a/runtime/instrumentation.h b/runtime/instrumentation.h
index cea0388..b667a40 100644
--- a/runtime/instrumentation.h
+++ b/runtime/instrumentation.h
@@ -94,6 +94,10 @@ struct InstrumentationListener {
                                mirror::ArtMethod* catch_method, uint32_t catch_dex_pc,
                                mirror::Throwable* exception_object)
       SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) = 0;
+
+  // Call-back for when we get a backward branch.
+  virtual void BackwardBranch(Thread* thread, mirror::ArtMethod* method, int32_t dex_pc_offset)
+      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) = 0;
 };
 
 // Instrumentation is a catch-all for when extra information is required from the runtime. The
@@ -103,13 +107,14 @@ struct InstrumentationListener {
 class Instrumentation {
  public:
   enum InstrumentationEvent {
-    kMethodEntered   = 1,  // 1 << 0
-    kMethodExited    = 2,  // 1 << 1
-    kMethodUnwind    = 4,  // 1 << 2
-    kDexPcMoved      = 8,  // 1 << 3
-    kFieldRead       = 16,  // 1 << 4,
-    kFieldWritten    = 32,  // 1 << 5
-    kExceptionCaught = 64,  // 1 << 6
+    kMethodEntered = 0x1,
+    kMethodExited = 0x2,
+    kMethodUnwind = 0x4,
+    kDexPcMoved = 0x8,
+    kFieldRead = 0x10,
+    kFieldWritten = 0x20,
+    kExceptionCaught = 0x40,
+    kBackwardBranch = 0x80,
   };
 
   Instrumentation();
@@ -244,6 +249,10 @@ class Instrumentation {
     return have_exception_caught_listeners_;
   }
 
+  bool HasBackwardBranchListeners() const SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
+    return have_backward_branch_listeners_;
+  }
+
   bool IsActive() const SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
     return have_dex_pc_listeners_ || have_method_entry_listeners_ || have_method_exit_listeners_ ||
         have_field_read_listeners_ || have_field_write_listeners_ ||
@@ -284,6 +293,14 @@ class Instrumentation {
     }
   }
 
+  // Inform listeners that a backward branch has been taken (only supported by the interpreter).
+  void BackwardBranch(Thread* thread, mirror::ArtMethod* method, int32_t offset) const
+      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
+    if (UNLIKELY(HasBackwardBranchListeners())) {
+      BackwardBranchImpl(thread, method, offset);
+    }
+  }
+
   // Inform listeners that we read a field (only supported by the interpreter).
   void FieldReadEvent(Thread* thread, mirror::Object* this_object,
                       mirror::ArtMethod* method, uint32_t dex_pc,
@@ -361,6 +378,8 @@ class Instrumentation {
   void DexPcMovedEventImpl(Thread* thread, mirror::Object* this_object,
                            mirror::ArtMethod* method, uint32_t dex_pc) const
       SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+  void BackwardBranchImpl(Thread* thread, mirror::ArtMethod* method, int32_t offset) const
+      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
   void FieldReadEventImpl(Thread* thread, mirror::Object* this_object,
                            mirror::ArtMethod* method, uint32_t dex_pc,
                            mirror::ArtField* field) const
@@ -429,10 +448,14 @@ class Instrumentation {
   // Do we have any exception caught listeners? Short-cut to avoid taking the instrumentation_lock_.
   bool have_exception_caught_listeners_ GUARDED_BY(Locks::mutator_lock_);
 
+  // Do we have any backward branch listeners? Short-cut to avoid taking the instrumentation_lock_.
+  bool have_backward_branch_listeners_ GUARDED_BY(Locks::mutator_lock_);
+
   // The event listeners, written to with the mutator_lock_ exclusively held.
   std::list<InstrumentationListener*> method_entry_listeners_ GUARDED_BY(Locks::mutator_lock_);
   std::list<InstrumentationListener*> method_exit_listeners_ GUARDED_BY(Locks::mutator_lock_);
   std::list<InstrumentationListener*> method_unwind_listeners_ GUARDED_BY(Locks::mutator_lock_);
+  std::list<InstrumentationListener*> backward_branch_listeners_ GUARDED_BY(Locks::mutator_lock_);
   std::shared_ptr<std::list<InstrumentationListener*>> dex_pc_listeners_
       GUARDED_BY(Locks::mutator_lock_);
   std::shared_ptr<std::list<InstrumentationListener*>> field_read_listeners_
diff --git a/runtime/interpreter/interpreter_goto_table_impl.cc b/runtime/interpreter/interpreter_goto_table_impl.cc
index e4b3247..37324ea 100644
--- a/runtime/interpreter/interpreter_goto_table_impl.cc
+++ b/runtime/interpreter/interpreter_goto_table_impl.cc
@@ -54,6 +54,12 @@ namespace interpreter {
 #define UPDATE_HANDLER_TABLE() \
   currentHandlersTable = handlersTable[Runtime::Current()->GetInstrumentation()->GetInterpreterHandlerTable()]
 
+#define BACKWARD_BRANCH_INSTRUMENTATION(offset) \
+  do { \
+    instrumentation::Instrumentation* instrumentation = Runtime::Current()->GetInstrumentation(); \
+    instrumentation->BackwardBranch(self, shadow_frame.GetMethod(), offset); \
+  } while (false)
+
 #define UNREACHABLE_CODE_CHECK()                \
   do {                                          \
     if (kIsDebugBuild) {                        \
@@ -135,7 +141,7 @@ JValue ExecuteGotoImpl(Thread* self, const DexFile::CodeItem* code_item, ShadowF
     }
   };
 
-  const bool do_assignability_check = do_access_check;
+  constexpr bool do_assignability_check = do_access_check;
   if (UNLIKELY(!shadow_frame.HasReferenceArray())) {
     LOG(FATAL) << "Invalid shadow frame for interpreter use";
     return JValue();
@@ -608,6 +614,7 @@ JValue ExecuteGotoImpl(Thread* self, const DexFile::CodeItem* code_item, ShadowF
   HANDLE_INSTRUCTION_START(GOTO) {
     int8_t offset = inst->VRegA_10t(inst_data);
     if (IsBackwardBranch(offset)) {
+      BACKWARD_BRANCH_INSTRUMENTATION(offset);
       if (UNLIKELY(self->TestAllFlags())) {
         self->CheckSuspend();
         UPDATE_HANDLER_TABLE();
@@ -620,6 +627,7 @@ JValue ExecuteGotoImpl(Thread* self, const DexFile::CodeItem* code_item, ShadowF
   HANDLE_INSTRUCTION_START(GOTO_16) {
     int16_t offset = inst->VRegA_20t();
     if (IsBackwardBranch(offset)) {
+      BACKWARD_BRANCH_INSTRUMENTATION(offset);
       if (UNLIKELY(self->TestAllFlags())) {
         self->CheckSuspend();
         UPDATE_HANDLER_TABLE();
@@ -632,6 +640,7 @@ JValue ExecuteGotoImpl(Thread* self, const DexFile::CodeItem* code_item, ShadowF
   HANDLE_INSTRUCTION_START(GOTO_32) {
     int32_t offset = inst->VRegA_30t();
     if (IsBackwardBranch(offset)) {
+      BACKWARD_BRANCH_INSTRUMENTATION(offset);
       if (UNLIKELY(self->TestAllFlags())) {
         self->CheckSuspend();
         UPDATE_HANDLER_TABLE();
@@ -644,6 +653,7 @@ JValue ExecuteGotoImpl(Thread* self, const DexFile::CodeItem* code_item, ShadowF
   HANDLE_INSTRUCTION_START(PACKED_SWITCH) {
     int32_t offset = DoPackedSwitch(inst, shadow_frame, inst_data);
     if (IsBackwardBranch(offset)) {
+      BACKWARD_BRANCH_INSTRUMENTATION(offset);
       if (UNLIKELY(self->TestAllFlags())) {
         self->CheckSuspend();
         UPDATE_HANDLER_TABLE();
@@ -656,6 +666,7 @@ JValue ExecuteGotoImpl(Thread* self, const DexFile::CodeItem* code_item, ShadowF
   HANDLE_INSTRUCTION_START(SPARSE_SWITCH) {
     int32_t offset = DoSparseSwitch(inst, shadow_frame, inst_data);
     if (IsBackwardBranch(offset)) {
+      BACKWARD_BRANCH_INSTRUMENTATION(offset);
       if (UNLIKELY(self->TestAllFlags())) {
         self->CheckSuspend();
         UPDATE_HANDLER_TABLE();
@@ -758,6 +769,7 @@ JValue ExecuteGotoImpl(Thread* self, const DexFile::CodeItem* code_item, ShadowF
     if (shadow_frame.GetVReg(inst->VRegA_22t(inst_data)) == shadow_frame.GetVReg(inst->VRegB_22t(inst_data))) {
       int16_t offset = inst->VRegC_22t();
       if (IsBackwardBranch(offset)) {
+        BACKWARD_BRANCH_INSTRUMENTATION(offset);
         if (UNLIKELY(self->TestAllFlags())) {
           self->CheckSuspend();
           UPDATE_HANDLER_TABLE();
@@ -774,6 +786,7 @@ JValue ExecuteGotoImpl(Thread* self, const DexFile::CodeItem* code_item, ShadowF
     if (shadow_frame.GetVReg(inst->VRegA_22t(inst_data)) != shadow_frame.GetVReg(inst->VRegB_22t(inst_data))) {
       int16_t offset = inst->VRegC_22t();
       if (IsBackwardBranch(offset)) {
+        BACKWARD_BRANCH_INSTRUMENTATION(offset);
         if (UNLIKELY(self->TestAllFlags())) {
           self->CheckSuspend();
           UPDATE_HANDLER_TABLE();
@@ -790,6 +803,7 @@ JValue ExecuteGotoImpl(Thread* self, const DexFile::CodeItem* code_item, ShadowF
     if (shadow_frame.GetVReg(inst->VRegA_22t(inst_data)) < shadow_frame.GetVReg(inst->VRegB_22t(inst_data))) {
       int16_t offset = inst->VRegC_22t();
       if (IsBackwardBranch(offset)) {
+        BACKWARD_BRANCH_INSTRUMENTATION(offset);
         if (UNLIKELY(self->TestAllFlags())) {
           self->CheckSuspend();
           UPDATE_HANDLER_TABLE();
@@ -806,6 +820,7 @@ JValue ExecuteGotoImpl(Thread* self, const DexFile::CodeItem* code_item, ShadowF
     if (shadow_frame.GetVReg(inst->VRegA_22t(inst_data)) >= shadow_frame.GetVReg(inst->VRegB_22t(inst_data))) {
       int16_t offset = inst->VRegC_22t();
       if (IsBackwardBranch(offset)) {
+        BACKWARD_BRANCH_INSTRUMENTATION(offset);
         if (UNLIKELY(self->TestAllFlags())) {
           self->CheckSuspend();
           UPDATE_HANDLER_TABLE();
@@ -822,6 +837,7 @@ JValue ExecuteGotoImpl(Thread* self, const DexFile::CodeItem* code_item, ShadowF
     if (shadow_frame.GetVReg(inst->VRegA_22t(inst_data)) > shadow_frame.GetVReg(inst->VRegB_22t(inst_data))) {
       int16_t offset = inst->VRegC_22t();
       if (IsBackwardBranch(offset)) {
+        BACKWARD_BRANCH_INSTRUMENTATION(offset);
         if (UNLIKELY(self->TestAllFlags())) {
           self->CheckSuspend();
           UPDATE_HANDLER_TABLE();
@@ -838,6 +854,7 @@ JValue ExecuteGotoImpl(Thread* self, const DexFile::CodeItem* code_item, ShadowF
     if (shadow_frame.GetVReg(inst->VRegA_22t(inst_data)) <= shadow_frame.GetVReg(inst->VRegB_22t(inst_data))) {
       int16_t offset = inst->VRegC_22t();
       if (IsBackwardBranch(offset)) {
+        BACKWARD_BRANCH_INSTRUMENTATION(offset);
         if (UNLIKELY(self->TestAllFlags())) {
           self->CheckSuspend();
           UPDATE_HANDLER_TABLE();
@@ -854,6 +871,7 @@ JValue ExecuteGotoImpl(Thread* self, const DexFile::CodeItem* code_item, ShadowF
     if (shadow_frame.GetVReg(inst->VRegA_21t(inst_data)) == 0) {
       int16_t offset = inst->VRegB_21t();
       if (IsBackwardBranch(offset)) {
+        BACKWARD_BRANCH_INSTRUMENTATION(offset);
         if (UNLIKELY(self->TestAllFlags())) {
           self->CheckSuspend();
           UPDATE_HANDLER_TABLE();
@@ -870,6 +888,7 @@ JValue ExecuteGotoImpl(Thread* self, const DexFile::CodeItem* code_item, ShadowF
     if (shadow_frame.GetVReg(inst->VRegA_21t(inst_data)) != 0) {
       int16_t offset = inst->VRegB_21t();
       if (IsBackwardBranch(offset)) {
+        BACKWARD_BRANCH_INSTRUMENTATION(offset);
         if (UNLIKELY(self->TestAllFlags())) {
           self->CheckSuspend();
           UPDATE_HANDLER_TABLE();
@@ -886,6 +905,7 @@ JValue ExecuteGotoImpl(Thread* self, const DexFile::CodeItem* code_item, ShadowF
     if (shadow_frame.GetVReg(inst->VRegA_21t(inst_data)) < 0) {
       int16_t offset = inst->VRegB_21t();
       if (IsBackwardBranch(offset)) {
+        BACKWARD_BRANCH_INSTRUMENTATION(offset);
         if (UNLIKELY(self->TestAllFlags())) {
           self->CheckSuspend();
           UPDATE_HANDLER_TABLE();
@@ -902,6 +922,7 @@ JValue ExecuteGotoImpl(Thread* self, const DexFile::CodeItem* code_item, ShadowF
     if (shadow_frame.GetVReg(inst->VRegA_21t(inst_data)) >= 0) {
       int16_t offset = inst->VRegB_21t();
       if (IsBackwardBranch(offset)) {
+        BACKWARD_BRANCH_INSTRUMENTATION(offset);
         if (UNLIKELY(self->TestAllFlags())) {
           self->CheckSuspend();
           UPDATE_HANDLER_TABLE();
@@ -918,6 +939,7 @@ JValue ExecuteGotoImpl(Thread* self, const DexFile::CodeItem* code_item, ShadowF
     if (shadow_frame.GetVReg(inst->VRegA_21t(inst_data)) > 0) {
       int16_t offset = inst->VRegB_21t();
       if (IsBackwardBranch(offset)) {
+        BACKWARD_BRANCH_INSTRUMENTATION(offset);
         if (UNLIKELY(self->TestAllFlags())) {
           self->CheckSuspend();
           UPDATE_HANDLER_TABLE();
@@ -934,6 +956,7 @@ JValue ExecuteGotoImpl(Thread* self, const DexFile::CodeItem* code_item, ShadowF
     if (shadow_frame.GetVReg(inst->VRegA_21t(inst_data)) <= 0) {
       int16_t offset = inst->VRegB_21t();
       if (IsBackwardBranch(offset)) {
+        BACKWARD_BRANCH_INSTRUMENTATION(offset);
         if (UNLIKELY(self->TestAllFlags())) {
           self->CheckSuspend();
           UPDATE_HANDLER_TABLE();
diff --git a/runtime/java_vm_ext.cc b/runtime/java_vm_ext.cc
index ea7c192..08332d3 100644
--- a/runtime/java_vm_ext.cc
+++ b/runtime/java_vm_ext.cc
@@ -337,7 +337,8 @@ class JII {
       thread_group = args->group;
     }
 
-    if (!runtime->AttachCurrentThread(thread_name, as_daemon, thread_group, !runtime->IsCompiler())) {
+    if (!runtime->AttachCurrentThread(thread_name, as_daemon, thread_group,
+                                      !runtime->IsAotCompiler())) {
       *p_env = nullptr;
       return JNI_ERR;
     } else {
diff --git a/runtime/jit/jit.cc b/runtime/jit/jit.cc
new file mode 100644
index 0000000..539c181
--- /dev/null
+++ b/runtime/jit/jit.cc
@@ -0,0 +1,160 @@
+/*
+ * Copyright 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "jit.h"
+
+#include <dlfcn.h>
+
+#include "entrypoints/runtime_asm_entrypoints.h"
+#include "interpreter/interpreter.h"
+#include "jit_code_cache.h"
+#include "jit_instrumentation.h"
+#include "mirror/art_method-inl.h"
+#include "runtime.h"
+#include "runtime_options.h"
+#include "thread_list.h"
+#include "utils.h"
+
+namespace art {
+namespace jit {
+
+JitOptions* JitOptions::CreateFromRuntimeArguments(const RuntimeArgumentMap& options) {
+  if (!options.GetOrDefault(RuntimeArgumentMap::UseJIT)) {
+    return nullptr;
+  }
+  auto* jit_options = new JitOptions;
+  jit_options->code_cache_capacity_ =
+      options.GetOrDefault(RuntimeArgumentMap::JITCodeCacheCapacity);
+  jit_options->compile_threshold_ =
+      options.GetOrDefault(RuntimeArgumentMap::JITCompileThreshold);
+  return jit_options;
+}
+
+Jit::Jit()
+    : jit_library_handle_(nullptr), jit_compiler_handle_(nullptr), jit_load_(nullptr),
+      jit_compile_method_(nullptr) {
+}
+
+Jit* Jit::Create(JitOptions* options, std::string* error_msg) {
+  std::unique_ptr<Jit> jit(new Jit);
+  if (!jit->LoadCompiler(error_msg)) {
+    return nullptr;
+  }
+  jit->code_cache_.reset(JitCodeCache::Create(options->GetCodeCacheCapacity(), error_msg));
+  if (jit->GetCodeCache() == nullptr) {
+    return nullptr;
+  }
+  LOG(INFO) << "JIT created with code_cache_capacity="
+      << PrettySize(options->GetCodeCacheCapacity())
+      << " compile_threshold=" << options->GetCompileThreshold();
+  return jit.release();
+}
+
+bool Jit::LoadCompiler(std::string* error_msg) {
+  jit_library_handle_ = dlopen(
+      kIsDebugBuild ? "libartd-compiler.so" : "libart-compiler.so", RTLD_NOW);
+  if (jit_library_handle_ == nullptr) {
+    std::ostringstream oss;
+    oss << "JIT could not load libart-compiler.so: " << dlerror();
+    *error_msg = oss.str();
+    return false;
+  }
+  jit_load_ = reinterpret_cast<void* (*)(CompilerCallbacks**)>(
+      dlsym(jit_library_handle_, "jit_load"));
+  if (jit_load_ == nullptr) {
+    dlclose(jit_library_handle_);
+    *error_msg = "JIT couldn't find jit_load entry point";
+    return false;
+  }
+  jit_unload_ = reinterpret_cast<void (*)(void*)>(
+      dlsym(jit_library_handle_, "jit_unload"));
+  if (jit_unload_ == nullptr) {
+    dlclose(jit_library_handle_);
+    *error_msg = "JIT couldn't find jit_unload entry point";
+    return false;
+  }
+  jit_compile_method_ = reinterpret_cast<bool (*)(void*, mirror::ArtMethod*, Thread*)>(
+      dlsym(jit_library_handle_, "jit_compile_method"));
+  if (jit_compile_method_ == nullptr) {
+    dlclose(jit_library_handle_);
+    *error_msg = "JIT couldn't find jit_compile_method entry point";
+    return false;
+  }
+  CompilerCallbacks* callbacks = nullptr;
+  VLOG(jit) << "Calling JitLoad interpreter_only="
+      << Runtime::Current()->GetInstrumentation()->InterpretOnly();
+  jit_compiler_handle_ = (jit_load_)(&callbacks);
+  if (jit_compiler_handle_ == nullptr) {
+    dlclose(jit_library_handle_);
+    *error_msg = "JIT couldn't load compiler";
+    return false;
+  }
+  if (callbacks == nullptr) {
+    dlclose(jit_library_handle_);
+    *error_msg = "JIT compiler callbacks were not set";
+    jit_compiler_handle_ = nullptr;
+    return false;
+  }
+  compiler_callbacks_ = callbacks;
+  return true;
+}
+
+bool Jit::CompileMethod(mirror::ArtMethod* method, Thread* self) {
+  DCHECK(!method->IsRuntimeMethod());
+  const bool result = jit_compile_method_(jit_compiler_handle_, method, self);
+  if (result) {
+    method->SetEntryPointFromInterpreter(artInterpreterToCompiledCodeBridge);
+  }
+  return result;
+}
+
+void Jit::CreateThreadPool() {
+  CHECK(instrumentation_cache_.get() != nullptr);
+  instrumentation_cache_->CreateThreadPool();
+}
+
+void Jit::DeleteThreadPool() {
+  if (instrumentation_cache_.get() != nullptr) {
+    instrumentation_cache_->DeleteThreadPool();
+  }
+}
+
+Jit::~Jit() {
+  DeleteThreadPool();
+  if (jit_compiler_handle_ != nullptr) {
+    jit_unload_(jit_compiler_handle_);
+  }
+  if (jit_library_handle_ != nullptr) {
+    dlclose(jit_library_handle_);
+  }
+}
+
+void Jit::CreateInstrumentationCache(size_t compile_threshold) {
+  CHECK_GT(compile_threshold, 0U);
+  Runtime* const runtime = Runtime::Current();
+  runtime->GetThreadList()->SuspendAll();
+  // Add Jit interpreter instrumentation, tells the interpreter when to notify the jit to compile
+  // something.
+  instrumentation_cache_.reset(new jit::JitInstrumentationCache(compile_threshold));
+  runtime->GetInstrumentation()->AddListener(
+      new jit::JitInstrumentationListener(instrumentation_cache_.get()),
+      instrumentation::Instrumentation::kMethodEntered |
+      instrumentation::Instrumentation::kBackwardBranch);
+  runtime->GetThreadList()->ResumeAll();
+}
+
+}  // namespace jit
+}  // namespace art
diff --git a/runtime/jit/jit.h b/runtime/jit/jit.h
new file mode 100644
index 0000000..b80015f
--- /dev/null
+++ b/runtime/jit/jit.h
@@ -0,0 +1,102 @@
+/*
+ * Copyright 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ART_RUNTIME_JIT_JIT_H_
+#define ART_RUNTIME_JIT_JIT_H_
+
+#include <unordered_map>
+
+#include "instrumentation.h"
+
+#include "atomic.h"
+#include "base/macros.h"
+#include "base/mutex.h"
+#include "gc_root.h"
+#include "jni.h"
+#include "object_callbacks.h"
+#include "thread_pool.h"
+
+namespace art {
+
+class CompilerCallbacks;
+struct RuntimeArgumentMap;
+
+namespace jit {
+
+class JitCodeCache;
+class JitInstrumentationCache;
+class JitOptions;
+
+class Jit {
+ public:
+  static constexpr bool kStressMode = kIsDebugBuild;
+  static constexpr size_t kDefaultCompileThreshold = kStressMode ? 1 : 1000;
+
+  virtual ~Jit();
+  static Jit* Create(JitOptions* options, std::string* error_msg);
+  bool CompileMethod(mirror::ArtMethod* method, Thread* self)
+      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+  void CreateInstrumentationCache(size_t compile_threshold);
+  void CreateThreadPool();
+  CompilerCallbacks* GetCompilerCallbacks() {
+    return compiler_callbacks_;
+  }
+  const JitCodeCache* GetCodeCache() const {
+    return code_cache_.get();
+  }
+  JitCodeCache* GetCodeCache() {
+    return code_cache_.get();
+  }
+  void DeleteThreadPool();
+
+ private:
+  Jit();
+  bool LoadCompiler(std::string* error_msg);
+
+  // JIT compiler
+  void* jit_library_handle_;
+  void* jit_compiler_handle_;
+  void* (*jit_load_)(CompilerCallbacks**);
+  void (*jit_unload_)(void*);
+  bool (*jit_compile_method_)(void*, mirror::ArtMethod*, Thread*);
+
+  std::unique_ptr<jit::JitInstrumentationCache> instrumentation_cache_;
+  std::unique_ptr<jit::JitCodeCache> code_cache_;
+  CompilerCallbacks* compiler_callbacks_;  // Owned by the jit compiler.
+};
+
+class JitOptions {
+ public:
+  static JitOptions* CreateFromRuntimeArguments(const RuntimeArgumentMap& options);
+  size_t GetCompileThreshold() const {
+    return compile_threshold_;
+  }
+  size_t GetCodeCacheCapacity() const {
+    return code_cache_capacity_;
+  }
+
+ private:
+  size_t code_cache_capacity_;
+  size_t compile_threshold_;
+
+  JitOptions() : code_cache_capacity_(0), compile_threshold_(0) {
+  }
+};
+
+}  // namespace jit
+}  // namespace art
+
+#endif  // ART_RUNTIME_JIT_JIT_H_
diff --git a/runtime/jit/jit_code_cache.cc b/runtime/jit/jit_code_cache.cc
new file mode 100644
index 0000000..8d4965e
--- /dev/null
+++ b/runtime/jit/jit_code_cache.cc
@@ -0,0 +1,121 @@
+/*
+ * Copyright 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "jit_code_cache.h"
+
+#include <sstream>
+
+#include "mem_map.h"
+#include "mirror/art_method-inl.h"
+#include "oat_file-inl.h"
+
+namespace art {
+namespace jit {
+
+JitCodeCache* JitCodeCache::Create(size_t capacity, std::string* error_msg) {
+  CHECK_GT(capacity, 0U);
+  CHECK_LT(capacity, kMaxCapacity);
+  std::string error_str;
+  // Map name specific for android_os_Debug.cpp accounting.
+  MemMap* map = MemMap::MapAnonymous("jit-code-cache", nullptr, capacity,
+                                     PROT_READ | PROT_WRITE | PROT_EXEC, false, &error_str);
+  if (map == nullptr) {
+    std::ostringstream oss;
+    oss << "Failed to create read write execute cache: " << error_str << " size=" << capacity;
+    *error_msg = oss.str();
+    return nullptr;
+  }
+  return new JitCodeCache(map);
+}
+
+JitCodeCache::JitCodeCache(MemMap* mem_map)
+    : lock_("Jit code cache", kJitCodeCacheLock), num_methods_(0) {
+  VLOG(jit) << "Created jit code cache size=" << PrettySize(mem_map->Size());
+  mem_map_.reset(mem_map);
+  uint8_t* divider = mem_map->Begin() + RoundUp(mem_map->Size() / 4, kPageSize);
+  // Data cache is 1 / 4 of the map. TODO: Make this variable?
+  // Put data at the start.
+  data_cache_ptr_ = mem_map->Begin();
+  data_cache_end_ = divider;
+  data_cache_begin_ = data_cache_ptr_;
+  mprotect(data_cache_ptr_, data_cache_end_ - data_cache_begin_, PROT_READ | PROT_WRITE);
+  // Code cache after.
+  code_cache_begin_ = divider;
+  code_cache_ptr_ = divider;
+  code_cache_end_ = mem_map->End();
+}
+
+bool JitCodeCache::ContainsMethod(mirror::ArtMethod* method) const {
+  return ContainsCodePtr(method->GetEntryPointFromQuickCompiledCode());
+}
+
+bool JitCodeCache::ContainsCodePtr(const void* ptr) const {
+  return ptr >= code_cache_begin_ && ptr < code_cache_end_;
+}
+
+void JitCodeCache::FlushInstructionCache() {
+  UNIMPLEMENTED(FATAL);
+  // TODO: Investigate if we need to do this.
+  // __clear_cache(reinterpret_cast<char*>(code_cache_begin_), static_cast<int>(CodeCacheSize()));
+}
+
+uint8_t* JitCodeCache::ReserveCode(Thread* self, size_t size) {
+  MutexLock mu(self, lock_);
+  if (size > CodeCacheRemain()) {
+    return nullptr;
+  }
+  code_cache_ptr_ += size;
+  return code_cache_ptr_ - size;
+}
+
+uint8_t* JitCodeCache::AddDataArray(Thread* self, const uint8_t* begin, const uint8_t* end) {
+  MutexLock mu(self, lock_);
+  const size_t size = end - begin;
+  if (size > DataCacheRemain()) {
+    return nullptr;  // Out of space in the data cache.
+  }
+  std::copy(begin, end, data_cache_ptr_);
+  data_cache_ptr_ += size;
+  return data_cache_ptr_ - size;
+}
+
+const void* JitCodeCache::GetCodeFor(mirror::ArtMethod* method) {
+  const void* code = method->GetEntryPointFromQuickCompiledCode();
+  if (ContainsCodePtr(code)) {
+    return code;
+  }
+  MutexLock mu(Thread::Current(), lock_);
+  auto it = method_code_map_.find(method);
+  if (it != method_code_map_.end()) {
+    return it->second;
+  }
+  return nullptr;
+}
+
+void JitCodeCache::SaveCompiledCode(mirror::ArtMethod* method, const void* old_code_ptr) {
+  DCHECK_EQ(method->GetEntryPointFromQuickCompiledCode(), old_code_ptr);
+  DCHECK(ContainsCodePtr(old_code_ptr)) << PrettyMethod(method) << " old_code_ptr="
+      << old_code_ptr;
+  MutexLock mu(Thread::Current(), lock_);
+  auto it = method_code_map_.find(method);
+  if (it != method_code_map_.end()) {
+    return;
+  }
+  method_code_map_.Put(method, old_code_ptr);
+}
+
+}  // namespace jit
+}  // namespace art
diff --git a/runtime/jit/jit_code_cache.h b/runtime/jit/jit_code_cache.h
new file mode 100644
index 0000000..aa8c717
--- /dev/null
+++ b/runtime/jit/jit_code_cache.h
@@ -0,0 +1,118 @@
+/*
+ * Copyright 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ART_RUNTIME_JIT_JIT_CODE_CACHE_H_
+#define ART_RUNTIME_JIT_JIT_CODE_CACHE_H_
+
+#include "instrumentation.h"
+
+#include "atomic.h"
+#include "base/macros.h"
+#include "base/mutex.h"
+#include "gc_root.h"
+#include "jni.h"
+#include "oat_file.h"
+#include "object_callbacks.h"
+#include "safe_map.h"
+#include "thread_pool.h"
+
+namespace art {
+
+class CompiledMethod;
+class CompilerCallbacks;
+
+namespace mirror {
+class ArtMethod;
+}  // namespcae mirror
+
+namespace jit {
+
+class JitInstrumentationCache;
+
+class JitCodeCache {
+ public:
+  static constexpr size_t kMaxCapacity = 1 * GB;
+  static constexpr size_t kDefaultCapacity = 2 * MB;
+
+  static JitCodeCache* Create(size_t capacity, std::string* error_msg);
+
+  const uint8_t* CodeCachePtr() const {
+    return code_cache_ptr_;
+  }
+  size_t CodeCacheSize() const {
+    return code_cache_ptr_ - code_cache_begin_;
+  }
+  size_t CodeCacheRemain() const {
+    return code_cache_end_ - code_cache_ptr_;
+  }
+  size_t DataCacheSize() const {
+    return data_cache_ptr_ - data_cache_begin_;
+  }
+  size_t DataCacheRemain() const {
+    return data_cache_end_ - data_cache_ptr_;
+  }
+  size_t NumMethods() const {
+    return num_methods_;
+  }
+
+  bool ContainsMethod(mirror::ArtMethod* method) const
+      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+  bool ContainsCodePtr(const void* ptr) const;
+
+  uint8_t* ReserveCode(Thread* self, size_t size) LOCKS_EXCLUDED(lock_);
+
+  uint8_t* AddDataArray(Thread* self, const uint8_t* begin, const uint8_t* end)
+      LOCKS_EXCLUDED(lock_);
+
+  // Get code for a method, returns null if it is not in the jit cache.
+  const void* GetCodeFor(mirror::ArtMethod* method)
+      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) LOCKS_EXCLUDED(lock_);
+
+  void SaveCompiledCode(mirror::ArtMethod* method, const void* old_code_ptr)
+      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) LOCKS_EXCLUDED(lock_);
+
+ private:
+  // Takes ownership of code_mem_map.
+  explicit JitCodeCache(MemMap* code_mem_map);
+  void FlushInstructionCache();
+
+  Mutex lock_;
+  // Mem map which holds code and data. We do this since we need to have 32 bit offsets from method
+  // headers in code cache which point to things in the data cache. If the maps are more than 4GB
+  // apart, having multiple maps wouldn't work.
+  std::unique_ptr<MemMap> mem_map_;
+  // Code cache section.
+  uint8_t* code_cache_ptr_;
+  const uint8_t* code_cache_begin_;
+  const uint8_t* code_cache_end_;
+  // Data cache section.
+  uint8_t* data_cache_ptr_;
+  const uint8_t* data_cache_begin_;
+  const uint8_t* data_cache_end_;
+  size_t num_methods_;
+  // TODO: This relies on methods not moving.
+  // This map holds code for methods if they were deoptimized by the instrumentation stubs. This is
+  // required since we have to implement ClassLinker::GetQuickOatCodeFor for walking stacks.
+  SafeMap<mirror::ArtMethod*, const void*> method_code_map_;
+
+  DISALLOW_COPY_AND_ASSIGN(JitCodeCache);
+};
+
+
+}  // namespace jit
+}  // namespace art
+
+#endif  // ART_RUNTIME_JIT_JIT_CODE_CACHE_H_
diff --git a/runtime/jit/jit_instrumentation.cc b/runtime/jit/jit_instrumentation.cc
new file mode 100644
index 0000000..160e678
--- /dev/null
+++ b/runtime/jit/jit_instrumentation.cc
@@ -0,0 +1,117 @@
+/*
+ * Copyright 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "jit_instrumentation.h"
+
+#include "jit.h"
+#include "jit_code_cache.h"
+#include "mirror/art_method-inl.h"
+#include "scoped_thread_state_change.h"
+
+namespace art {
+namespace jit {
+
+class JitCompileTask : public Task {
+ public:
+  explicit JitCompileTask(mirror::ArtMethod* method, JitInstrumentationCache* cache)
+      : method_(method), cache_(cache) {
+  }
+
+  virtual void Run(Thread* self) OVERRIDE {
+    ScopedObjectAccess soa(self);
+    VLOG(jit) << "JitCompileTask compiling method " << PrettyMethod(method_);
+    if (Runtime::Current()->GetJit()->CompileMethod(method_, self)) {
+      cache_->SignalCompiled(self, method_);
+    } else {
+      VLOG(jit) << "Failed to compile method " << PrettyMethod(method_);
+    }
+  }
+
+  virtual void Finalize() OVERRIDE {
+    delete this;
+  }
+
+ private:
+  mirror::ArtMethod* const method_;
+  JitInstrumentationCache* const cache_;
+};
+
+JitInstrumentationCache::JitInstrumentationCache(size_t hot_method_threshold)
+    : lock_("jit instrumentation lock"), hot_method_threshold_(hot_method_threshold) {
+}
+
+void JitInstrumentationCache::CreateThreadPool() {
+  thread_pool_.reset(new ThreadPool("Jit thread pool", 1));
+}
+
+void JitInstrumentationCache::DeleteThreadPool() {
+  thread_pool_.reset();
+}
+
+void JitInstrumentationCache::SignalCompiled(Thread* self, mirror::ArtMethod* method) {
+  ScopedObjectAccessUnchecked soa(self);
+  jmethodID method_id = soa.EncodeMethod(method);
+  MutexLock mu(self, lock_);
+  auto it = samples_.find(method_id);
+  if (it != samples_.end()) {
+    samples_.erase(it);
+  }
+}
+
+void JitInstrumentationCache::AddSamples(Thread* self, mirror::ArtMethod* method, size_t count) {
+  ScopedObjectAccessUnchecked soa(self);
+  // Since we don't have on-stack replacement, some methods can remain in the interpreter longer
+  // than we want resulting in samples even after the method is compiled.
+  if (method->IsClassInitializer() ||
+      Runtime::Current()->GetJit()->GetCodeCache()->ContainsMethod(method)) {
+    return;
+  }
+  jmethodID method_id = soa.EncodeMethod(method);
+  bool is_hot = false;
+  {
+    MutexLock mu(self, lock_);
+    size_t sample_count = 0;
+    auto it = samples_.find(method_id);
+    if (it != samples_.end()) {
+      it->second += count;
+      sample_count = it->second;
+    } else {
+      sample_count = count;
+      samples_.insert(std::make_pair(method_id, count));
+    }
+    // If we have enough samples, mark as hot and request Jit compilation.
+    if (sample_count >= hot_method_threshold_ && sample_count - count < hot_method_threshold_) {
+      is_hot = true;
+    }
+  }
+  if (is_hot) {
+    if (thread_pool_.get() != nullptr) {
+      thread_pool_->AddTask(self, new JitCompileTask(method->GetInterfaceMethodIfProxy(), this));
+      thread_pool_->StartWorkers(self);
+    } else {
+      VLOG(jit) << "Compiling hot method " << PrettyMethod(method);
+      Runtime::Current()->GetJit()->CompileMethod(method->GetInterfaceMethodIfProxy(), self);
+    }
+  }
+}
+
+JitInstrumentationListener::JitInstrumentationListener(JitInstrumentationCache* cache)
+    : instrumentation_cache_(cache) {
+  CHECK(instrumentation_cache_ != nullptr);
+}
+
+}  // namespace jit
+}  // namespace art
diff --git a/runtime/jit/jit_instrumentation.h b/runtime/jit/jit_instrumentation.h
new file mode 100644
index 0000000..9576f4b
--- /dev/null
+++ b/runtime/jit/jit_instrumentation.h
@@ -0,0 +1,107 @@
+/*
+ * Copyright 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ART_RUNTIME_JIT_JIT_INSTRUMENTATION_H_
+#define ART_RUNTIME_JIT_JIT_INSTRUMENTATION_H_
+
+#include <unordered_map>
+
+#include "instrumentation.h"
+
+#include "atomic.h"
+#include "base/macros.h"
+#include "base/mutex.h"
+#include "gc_root.h"
+#include "jni.h"
+#include "object_callbacks.h"
+#include "thread_pool.h"
+
+namespace art {
+namespace mirror {
+  class ArtField;
+  class ArtMethod;
+  class Class;
+  class Object;
+  class Throwable;
+}  // namespace mirror
+union JValue;
+class Thread;
+class ThrowLocation;
+
+namespace jit {
+
+// Keeps track of which methods are hot.
+class JitInstrumentationCache {
+ public:
+  explicit JitInstrumentationCache(size_t hot_method_threshold);
+  void AddSamples(Thread* self, mirror::ArtMethod* method, size_t samples)
+      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+  void SignalCompiled(Thread* self, mirror::ArtMethod* method)
+      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+  void CreateThreadPool();
+  void DeleteThreadPool();
+
+ private:
+  Mutex lock_;
+  std::unordered_map<jmethodID, size_t> samples_;
+  size_t hot_method_threshold_;
+  std::unique_ptr<ThreadPool> thread_pool_;
+};
+
+class JitInstrumentationListener : public instrumentation::InstrumentationListener {
+ public:
+  explicit JitInstrumentationListener(JitInstrumentationCache* cache);
+
+  virtual void MethodEntered(Thread* thread, mirror::Object* /*this_object*/,
+                             mirror::ArtMethod* method, uint32_t /*dex_pc*/)
+      OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
+    instrumentation_cache_->AddSamples(thread, method, 1);
+  }
+  virtual void MethodExited(Thread* /*thread*/, mirror::Object* /*this_object*/,
+                            mirror::ArtMethod* /*method*/, uint32_t /*dex_pc*/,
+                            const JValue& /*return_value*/)
+      OVERRIDE { }
+  virtual void MethodUnwind(Thread* /*thread*/, mirror::Object* /*this_object*/,
+                            mirror::ArtMethod* /*method*/, uint32_t /*dex_pc*/) OVERRIDE { }
+  virtual void FieldRead(Thread* /*thread*/, mirror::Object* /*this_object*/,
+                         mirror::ArtMethod* /*method*/, uint32_t /*dex_pc*/,
+                         mirror::ArtField* /*field*/) OVERRIDE { }
+  virtual void FieldWritten(Thread* /*thread*/, mirror::Object* /*this_object*/,
+                            mirror::ArtMethod* /*method*/, uint32_t /*dex_pc*/,
+                            mirror::ArtField* /*field*/, const JValue& /*field_value*/)
+      OVERRIDE { }
+  virtual void ExceptionCaught(Thread* /*thread*/, const ThrowLocation& /*throw_location*/,
+                               mirror::ArtMethod* /*catch_method*/, uint32_t /*catch_dex_pc*/,
+                               mirror::Throwable* /*exception_object*/) OVERRIDE { }
+
+  virtual void DexPcMoved(Thread* /*self*/, mirror::Object* /*this_object*/,
+                          mirror::ArtMethod* /*method*/, uint32_t /*new_dex_pc*/) OVERRIDE { }
+
+  // We only care about how many dex instructions were executed in the Jit.
+  virtual void BackwardBranch(Thread* thread, mirror::ArtMethod* method, int32_t dex_pc_offset)
+      OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
+    CHECK_LE(dex_pc_offset, 0);
+    instrumentation_cache_->AddSamples(thread, method, 1);
+  }
+
+ private:
+  JitInstrumentationCache* const instrumentation_cache_;
+};
+
+}  // namespace jit
+}  // namespace art
+
+#endif  // ART_RUNTIME_JIT_JIT_INSTRUMENTATION_H_
diff --git a/runtime/mirror/art_field.cc b/runtime/mirror/art_field.cc
index 5a4ebd1..3cea4a1 100644
--- a/runtime/mirror/art_field.cc
+++ b/runtime/mirror/art_field.cc
@@ -44,7 +44,7 @@ void ArtField::ResetClass() {
 
 void ArtField::SetOffset(MemberOffset num_bytes) {
   DCHECK(GetDeclaringClass()->IsLoaded() || GetDeclaringClass()->IsErroneous());
-  if (kIsDebugBuild && Runtime::Current()->IsCompiler() &&
+  if (kIsDebugBuild && Runtime::Current()->IsAotCompiler() &&
       !Runtime::Current()->UseCompileTimeClassPath()) {
     Primitive::Type type = GetTypeAsPrimitiveType();
     if (type == Primitive::kPrimDouble || type == Primitive::kPrimLong) {
diff --git a/runtime/mirror/art_method-inl.h b/runtime/mirror/art_method-inl.h
index 7d31148..c27c6e9 100644
--- a/runtime/mirror/art_method-inl.h
+++ b/runtime/mirror/art_method-inl.h
@@ -147,7 +147,10 @@ inline mirror::Class* ArtMethod::GetClassFromTypeIndex(uint16_t type_idx, bool r
 
 inline uint32_t ArtMethod::GetCodeSize() {
   DCHECK(!IsRuntimeMethod() && !IsProxyMethod()) << PrettyMethod(this);
-  const void* code = EntryPointToCodePointer(GetEntryPointFromQuickCompiledCode());
+  return GetCodeSize(EntryPointToCodePointer(GetEntryPointFromQuickCompiledCode()));
+}
+
+inline uint32_t ArtMethod::GetCodeSize(const void* code) {
   if (code == nullptr) {
     return 0u;
   }
diff --git a/runtime/mirror/art_method.cc b/runtime/mirror/art_method.cc
index b2016dc..6259745 100644
--- a/runtime/mirror/art_method.cc
+++ b/runtime/mirror/art_method.cc
@@ -27,6 +27,8 @@
 #include "entrypoints/runtime_asm_entrypoints.h"
 #include "gc/accounting/card_table-inl.h"
 #include "interpreter/interpreter.h"
+#include "jit/jit.h"
+#include "jit/jit_code_cache.h"
 #include "jni_internal.h"
 #include "mapping_table.h"
 #include "object_array-inl.h"
@@ -229,6 +231,7 @@ uint32_t ArtMethod::ToDexPc(const uintptr_t pc, bool abort_on_failure) {
   if (abort_on_failure) {
       LOG(FATAL) << "Failed to find Dex offset for PC offset " << reinterpret_cast<void*>(sought_offset)
              << "(PC " << reinterpret_cast<void*>(pc) << ", entry_point=" << entry_point
+             << " current entry_point=" << GetQuickOatEntryPoint(sizeof(void*))
              << ") in " << PrettyMethod(this);
   }
   return DexFile::kDexNoIndex;
@@ -329,6 +332,13 @@ void ArtMethod::AssertPcIsWithinQuickCode(uintptr_t pc) {
       class_linker->IsQuickResolutionStub(code)) {
     return;
   }
+  // If we are the JIT then we may have just compiled the method after the
+  // IsQuickToInterpreterBridge check.
+  jit::Jit* const jit = Runtime::Current()->GetJit();
+  if (jit != nullptr &&
+      jit->GetCodeCache()->ContainsCodePtr(reinterpret_cast<const void*>(code))) {
+    return;
+  }
   /*
    * During a stack walk, a return PC may point past-the-end of the code
    * in the case that the last instruction is a call that isn't expected to
@@ -336,11 +346,11 @@ void ArtMethod::AssertPcIsWithinQuickCode(uintptr_t pc) {
    *
    * NOTE: For Thumb both pc and code are offset by 1 indicating the Thumb state.
    */
-  CHECK(PcIsWithinQuickCode(pc))
+  CHECK(PcIsWithinQuickCode(reinterpret_cast<uintptr_t>(code), pc))
       << PrettyMethod(this)
       << " pc=" << std::hex << pc
       << " code=" << code
-      << " size=" << GetCodeSize();
+      << " size=" << GetCodeSize(reinterpret_cast<const void*>(code));
 }
 
 bool ArtMethod::IsEntrypointInterpreter() {
@@ -410,7 +420,8 @@ void ArtMethod::Invoke(Thread* self, uint32_t* args, uint32_t args_size, JValue*
       }
 
       // Ensure that we won't be accidentally calling quick compiled code when -Xint.
-      if (kIsDebugBuild && Runtime::Current()->GetInstrumentation()->IsForcedInterpretOnly()) {
+      if (kIsDebugBuild && runtime->GetInstrumentation()->IsForcedInterpretOnly()) {
+        DCHECK(!runtime->UseJit());
         CHECK(IsEntrypointInterpreter())
             << "Don't call compiled code when -Xint " << PrettyMethod(this);
       }
diff --git a/runtime/mirror/art_method.h b/runtime/mirror/art_method.h
index f33ca94..019fdcd 100644
--- a/runtime/mirror/art_method.h
+++ b/runtime/mirror/art_method.h
@@ -305,18 +305,8 @@ class MANAGED ArtMethod FINAL : public Object {
   // quick entrypoint. This code isn't robust for instrumentation, etc. and is only used for
   // debug purposes.
   bool PcIsWithinQuickCode(uintptr_t pc) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
-    uintptr_t code = reinterpret_cast<uintptr_t>(GetEntryPointFromQuickCompiledCode());
-    if (code == 0) {
-      return pc == 0;
-    }
-    /*
-     * During a stack walk, a return PC may point past-the-end of the code
-     * in the case that the last instruction is a call that isn't expected to
-     * return.  Thus, we check <= code + GetCodeSize().
-     *
-     * NOTE: For Thumb both pc and code are offset by 1 indicating the Thumb state.
-     */
-    return code <= pc && pc <= code + GetCodeSize();
+    return PcIsWithinQuickCode(
+        reinterpret_cast<uintptr_t>(GetEntryPointFromQuickCompiledCode()), pc);
   }
 
   void AssertPcIsWithinQuickCode(uintptr_t pc) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
@@ -622,6 +612,23 @@ class MANAGED ArtMethod FINAL : public Object {
     return offset;
   }
 
+  // Code points to the start of the quick code.
+  static uint32_t GetCodeSize(const void* code);
+
+  static bool PcIsWithinQuickCode(uintptr_t code, uintptr_t pc) {
+    if (code == 0) {
+      return pc == 0;
+    }
+    /*
+     * During a stack walk, a return PC may point past-the-end of the code
+     * in the case that the last instruction is a call that isn't expected to
+     * return.  Thus, we check <= code + GetCodeSize().
+     *
+     * NOTE: For Thumb both pc and code are offset by 1 indicating the Thumb state.
+     */
+    return code <= pc && pc <= code + GetCodeSize(reinterpret_cast<const void*>(code));
+  }
+
   friend struct art::ArtMethodOffsets;  // for verifying offset information
   DISALLOW_IMPLICIT_CONSTRUCTORS(ArtMethod);
 };
diff --git a/runtime/oat_file.cc b/runtime/oat_file.cc
index 9061bb3..3192e03 100644
--- a/runtime/oat_file.cc
+++ b/runtime/oat_file.cc
@@ -577,12 +577,12 @@ const OatFile::OatMethod OatFile::OatClass::GetOatMethod(uint32_t method_index)
   }
   if (oat_file_->IsExecutable() ||
       Runtime::Current() == nullptr ||        // This case applies for oatdump.
-      Runtime::Current()->IsCompiler()) {
+      Runtime::Current()->IsAotCompiler()) {
     return OatMethod(oat_file_->Begin(), oat_method_offsets->code_offset_);
-  } else {
-    // We aren't allowed to use the compiled code. We just force it down the interpreted version.
-    return OatMethod(oat_file_->Begin(), 0);
   }
+  // We aren't allowed to use the compiled code. We just force it down the interpreted / jit
+  // version.
+  return OatMethod(oat_file_->Begin(), 0);
 }
 
 void OatFile::OatMethod::LinkMethod(mirror::ArtMethod* method) const {
diff --git a/runtime/oat_file.h b/runtime/oat_file.h
index 6ae3c3e..5e68439 100644
--- a/runtime/oat_file.h
+++ b/runtime/oat_file.h
@@ -147,8 +147,8 @@ class OatFile {
       return reinterpret_cast<T>(begin_ + offset);
     }
 
-    const uint8_t* const begin_;
-    const uint32_t code_offset_;
+    const uint8_t* begin_;
+    uint32_t code_offset_;
 
     friend class OatClass;
   };
diff --git a/runtime/object_lock.cc b/runtime/object_lock.cc
index f7accc0..749fb5d 100644
--- a/runtime/object_lock.cc
+++ b/runtime/object_lock.cc
@@ -47,6 +47,7 @@ void ObjectLock<T>::NotifyAll() {
   obj_->NotifyAll(self_);
 }
 
+template class ObjectLock<mirror::ArtMethod>;
 template class ObjectLock<mirror::Class>;
 template class ObjectLock<mirror::Object>;
 
diff --git a/runtime/parsed_options.cc b/runtime/parsed_options.cc
index c0c7baa..9d87ed7 100644
--- a/runtime/parsed_options.cc
+++ b/runtime/parsed_options.cc
@@ -146,6 +146,15 @@ std::unique_ptr<RuntimeParser> ParsedOptions::MakeParser(bool ignore_unrecognize
       .Define({"-XX:EnableHSpaceCompactForOOM", "-XX:DisableHSpaceCompactForOOM"})
           .WithValues({true, false})
           .IntoKey(M::EnableHSpaceCompactForOOM)
+      .Define({"-Xjit", "-Xnojit"})
+          .WithValues({true, false})
+          .IntoKey(M::UseJIT)
+      .Define("-Xjitcodecachesize:_")
+          .WithType<MemoryKiB>()
+          .IntoKey(M::JITCodeCacheCapacity)
+      .Define("-Xjitthreshold:_")
+          .WithType<unsigned int>()
+          .IntoKey(M::JITCompileThreshold)
       .Define("-XX:HspaceCompactForOOMMinIntervalMs=_")  // in ms
           .WithType<MillisecondsToNanoseconds>()  // store as ns
           .IntoKey(M::HSpaceCompactForOOMMinIntervalsMs)
@@ -248,7 +257,7 @@ std::unique_ptr<RuntimeParser> ParsedOptions::MakeParser(bool ignore_unrecognize
           "-dsa", "-enablesystemassertions", "-disablesystemassertions", "-Xrs", "-Xint:_",
           "-Xdexopt:_", "-Xnoquithandler", "-Xjnigreflimit:_", "-Xgenregmap", "-Xnogenregmap",
           "-Xverifyopt:_", "-Xcheckdexsum", "-Xincludeselectedop", "-Xjitop:_",
-          "-Xincludeselectedmethod", "-Xjitthreshold:_", "-Xjitcodecachesize:_",
+          "-Xincludeselectedmethod", "-Xjitthreshold:_",
           "-Xjitblocking", "-Xjitmethod:_", "-Xjitclass:_", "-Xjitoffset:_",
           "-Xjitconfig:_", "-Xjitcheckcg", "-Xjitverbose", "-Xjitprofile",
           "-Xjitdisableopt", "-Xjitsuspendpoll", "-XX:mainThreadStackSize=_"})
@@ -353,19 +362,20 @@ bool ParsedOptions::ProcessSpecialOptions(const RuntimeOptions& options,
 
 bool ParsedOptions::Parse(const RuntimeOptions& options, bool ignore_unrecognized,
                           RuntimeArgumentMap* runtime_options) {
-//  gLogVerbosity.class_linker = true;  // TODO: don't check this in!
-//  gLogVerbosity.compiler = true;  // TODO: don't check this in!
-//  gLogVerbosity.gc = true;  // TODO: don't check this in!
-//  gLogVerbosity.heap = true;  // TODO: don't check this in!
-//  gLogVerbosity.jdwp = true;  // TODO: don't check this in!
-//  gLogVerbosity.jni = true;  // TODO: don't check this in!
-//  gLogVerbosity.monitor = true;  // TODO: don't check this in!
-//  gLogVerbosity.profiler = true;  // TODO: don't check this in!
-//  gLogVerbosity.signals = true;  // TODO: don't check this in!
-//  gLogVerbosity.startup = true;  // TODO: don't check this in!
-//  gLogVerbosity.third_party_jni = true;  // TODO: don't check this in!
-//  gLogVerbosity.threads = true;  // TODO: don't check this in!
-//  gLogVerbosity.verifier = true;  // TODO: don't check this in!
+  //  gLogVerbosity.class_linker = true;  // TODO: don't check this in!
+  //  gLogVerbosity.compiler = true;  // TODO: don't check this in!
+  //  gLogVerbosity.gc = true;  // TODO: don't check this in!
+  //  gLogVerbosity.heap = true;  // TODO: don't check this in!
+  //  gLogVerbosity.jdwp = true;  // TODO: don't check this in!
+  //  gLogVerbosity.jit = true;  // TODO: don't check this in!
+  //  gLogVerbosity.jni = true;  // TODO: don't check this in!
+  //  gLogVerbosity.monitor = true;  // TODO: don't check this in!
+  //  gLogVerbosity.profiler = true;  // TODO: don't check this in!
+  //  gLogVerbosity.signals = true;  // TODO: don't check this in!
+  //  gLogVerbosity.startup = true;  // TODO: don't check this in!
+  //  gLogVerbosity.third_party_jni = true;  // TODO: don't check this in!
+  //  gLogVerbosity.threads = true;  // TODO: don't check this in!
+  //  gLogVerbosity.verifier = true;  // TODO: don't check this in!
 
   for (size_t i = 0; i < options.size(); ++i) {
     if (true && options[0].first == "-Xzygote") {
@@ -560,7 +570,7 @@ void ParsedOptions::Usage(const char* fmt, ...) {
   UsageMessage(stream, "The following standard options are supported:\n");
   UsageMessage(stream, "  -classpath classpath (-cp classpath)\n");
   UsageMessage(stream, "  -Dproperty=value\n");
-  UsageMessage(stream, "  -verbose:tag ('gc', 'jni', or 'class')\n");
+  UsageMessage(stream, "  -verbose:tag ('gc', 'jit', 'jni', or 'class')\n");
   UsageMessage(stream, "  -showversion\n");
   UsageMessage(stream, "  -help\n");
   UsageMessage(stream, "  -agentlib:jdwp=options\n");
@@ -590,6 +600,8 @@ void ParsedOptions::Usage(const char* fmt, ...) {
   UsageMessage(stream, "  -XX:ForegroundHeapGrowthMultiplier=doublevalue\n");
   UsageMessage(stream, "  -XX:LowMemoryMode\n");
   UsageMessage(stream, "  -Xprofile:{threadcpuclock,wallclock,dualclock}\n");
+  UsageMessage(stream, "  -Xjitcodecachesize:N\n");
+  UsageMessage(stream, "  -Xjitthreshold:integervalue\n");
   UsageMessage(stream, "\n");
 
   UsageMessage(stream, "The following unique to ART options are supported:\n");
@@ -630,6 +642,8 @@ void ParsedOptions::Usage(const char* fmt, ...) {
   UsageMessage(stream, "  -Xcompiler-option dex2oat-option\n");
   UsageMessage(stream, "  -Ximage-compiler-option dex2oat-option\n");
   UsageMessage(stream, "  -Xpatchoat:filename\n");
+  UsageMessage(stream, "  -Xjit\n");
+  UsageMessage(stream, "  -Xnojit\n");
   UsageMessage(stream, "  -X[no]relocate\n");
   UsageMessage(stream, "  -X[no]dex2oat (Whether to invoke dex2oat on the application)\n");
   UsageMessage(stream, "  -X[no]image-dex2oat (Whether to create and use a boot image)\n");
@@ -659,8 +673,6 @@ void ParsedOptions::Usage(const char* fmt, ...) {
   UsageMessage(stream, "  -Xincludeselectedop\n");
   UsageMessage(stream, "  -Xjitop:hexopvalue[-endvalue][,hexopvalue[-endvalue]]*\n");
   UsageMessage(stream, "  -Xincludeselectedmethod\n");
-  UsageMessage(stream, "  -Xjitthreshold:integervalue\n");
-  UsageMessage(stream, "  -Xjitcodecachesize:decimalvalueofkbytes\n");
   UsageMessage(stream, "  -Xjitblocking\n");
   UsageMessage(stream, "  -Xjitmethod:signature[,signature]* (eg Ljava/lang/String\\;replace)\n");
   UsageMessage(stream, "  -Xjitclass:classname[,classname]*\n");
diff --git a/runtime/profiler.cc b/runtime/profiler.cc
index c3bdcb1..db372c3 100644
--- a/runtime/profiler.cc
+++ b/runtime/profiler.cc
@@ -161,7 +161,7 @@ void* BackgroundMethodSamplingProfiler::RunProfilerThread(void* arg) {
 
 
   CHECK(runtime->AttachCurrentThread("Profiler", true, runtime->GetSystemThreadGroup(),
-                                      !runtime->IsCompiler()));
+                                      !runtime->IsAotCompiler()));
 
   Thread* self = Thread::Current();
 
diff --git a/runtime/quick/inline_method_analyser.cc b/runtime/quick/inline_method_analyser.cc
index d65b2d5..44e2844 100644
--- a/runtime/quick/inline_method_analyser.cc
+++ b/runtime/quick/inline_method_analyser.cc
@@ -77,7 +77,9 @@ bool InlineMethodAnalyser::AnalyseMethodCode(verifier::MethodVerifier* verifier,
                                              InlineMethod* method) {
   DCHECK(verifier != nullptr);
   DCHECK_EQ(Runtime::Current()->IsCompiler(), method != nullptr);
-  DCHECK_EQ(verifier->CanLoadClasses(), method != nullptr);
+  if (!Runtime::Current()->UseJit()) {
+    DCHECK_EQ(verifier->CanLoadClasses(), method != nullptr);
+  }
   // We currently support only plain return or 2-instruction methods.
 
   const DexFile::CodeItem* code_item = verifier->CodeItem();
@@ -110,6 +112,10 @@ bool InlineMethodAnalyser::AnalyseMethodCode(verifier::MethodVerifier* verifier,
     case Instruction::IGET_CHAR:
     case Instruction::IGET_SHORT:
     case Instruction::IGET_WIDE:
+    // TODO: Add handling for JIT.
+    // case Instruction::IGET_QUICK:
+    // case Instruction::IGET_WIDE_QUICK:
+    // case Instruction::IGET_OBJECT_QUICK:
       return AnalyseIGetMethod(verifier, method);
     case Instruction::IPUT:
     case Instruction::IPUT_OBJECT:
@@ -118,6 +124,10 @@ bool InlineMethodAnalyser::AnalyseMethodCode(verifier::MethodVerifier* verifier,
     case Instruction::IPUT_CHAR:
     case Instruction::IPUT_SHORT:
     case Instruction::IPUT_WIDE:
+      // TODO: Add handling for JIT.
+    // case Instruction::IPUT_QUICK:
+    // case Instruction::IPUT_WIDE_QUICK:
+    // case Instruction::IPUT_OBJECT_QUICK:
       return AnalyseIPutMethod(verifier, method);
     default:
       return false;
diff --git a/runtime/runtime.cc b/runtime/runtime.cc
index 8cd9e24..8c5827c 100644
--- a/runtime/runtime.cc
+++ b/runtime/runtime.cc
@@ -65,6 +65,8 @@
 #include "image.h"
 #include "instrumentation.h"
 #include "intern_table.h"
+#include "interpreter/interpreter.h"
+#include "jit/jit.h"
 #include "jni_internal.h"
 #include "mirror/array.h"
 #include "mirror/art_field-inl.h"
@@ -229,6 +231,12 @@ Runtime::~Runtime() {
   // Make sure to let the GC complete if it is running.
   heap_->WaitForGcToComplete(gc::kGcCauseBackground, self);
   heap_->DeleteThreadPool();
+  if (jit_.get() != nullptr) {
+    VLOG(jit) << "Deleting jit thread pool";
+    // Delete thread pool before the thread list since we don't want to wait forever on the
+    // JIT compiler threads.
+    jit_->DeleteThreadPool();
+  }
 
   // Make sure our internal threads are dead before we start tearing down things they're using.
   Dbg::StopJdwp();
@@ -237,6 +245,13 @@ Runtime::~Runtime() {
   // Make sure all other non-daemon threads have terminated, and all daemon threads are suspended.
   delete thread_list_;
 
+  // Delete the JIT after thread list to ensure that there is no remaining threads which could be
+  // accessing the instrumentation when we delete it.
+  if (jit_.get() != nullptr) {
+    VLOG(jit) << "Deleting jit";
+    jit_.reset(nullptr);
+  }
+
   // Shutdown the fault manager if it was initialized.
   fault_manager.Shutdown();
 
@@ -461,17 +476,24 @@ bool Runtime::Start() {
 
   started_ = true;
 
-  // Use !IsCompiler so that we get test coverage, tests are never the zygote.
-  if (!IsCompiler()) {
+  // Use !IsAotCompiler so that we get test coverage, tests are never the zygote.
+  if (!IsAotCompiler()) {
     ScopedObjectAccess soa(self);
     gc::space::ImageSpace* image_space = heap_->GetImageSpace();
     if (image_space != nullptr) {
-      Runtime::Current()->GetInternTable()->AddImageStringsToTable(image_space);
-      Runtime::Current()->GetClassLinker()->MoveImageClassesToClassTable();
+      GetInternTable()->AddImageStringsToTable(image_space);
+      GetClassLinker()->MoveImageClassesToClassTable();
     }
   }
 
-  if (!IsImageDex2OatEnabled() || !Runtime::Current()->GetHeap()->HasImageSpace()) {
+  // If we are the zygote then we need to wait until after forking to create the code cache due to
+  // SELinux restrictions on r/w/x memory regions.
+  if (!IsZygote() && jit_.get() != nullptr) {
+    jit_->CreateInstrumentationCache(jit_options_->GetCompileThreshold());
+    jit_->CreateThreadPool();
+  }
+
+  if (!IsImageDex2OatEnabled() || !GetHeap()->HasImageSpace()) {
     ScopedObjectAccess soa(self);
     StackHandleScope<1> hs(soa.Self());
     auto klass(hs.NewHandle<mirror::Class>(mirror::Class::GetJavaLangClass()));
@@ -590,8 +612,14 @@ void Runtime::DidForkFromZygote(JNIEnv* env, NativeBridgeAction action, const ch
     }
   }
 
-  // Create the thread pool.
+  // Create the thread pools.
   heap_->CreateThreadPool();
+  if (jit_options_.get() != nullptr && jit_.get() == nullptr) {
+    // Create the JIT if the flag is set and we haven't already create it (happens for run-tests).
+    CreateJit();
+    jit_->CreateInstrumentationCache(jit_options_->GetCompileThreshold());
+    jit_->CreateThreadPool();
+  }
 
   StartSignalCatcher();
 
@@ -818,6 +846,17 @@ bool Runtime::Init(const RuntimeOptions& raw_options, bool ignore_unrecognized)
     Dbg::ConfigureJdwp(runtime_options.GetOrDefault(Opt::JdwpOptions));
   }
 
+  if (!IsCompiler()) {
+    // If we are already the compiler at this point, we must be dex2oat. Don't create the jit in
+    // this case.
+    // If runtime_options doesn't have UseJIT set to true then CreateFromRuntimeArguments returns
+    // nullptr and we don't create the jit.
+    jit_options_.reset(jit::JitOptions::CreateFromRuntimeArguments(runtime_options));
+  }
+  if (!IsZygote() && jit_options_.get() != nullptr) {
+    CreateJit();
+  }
+
   BlockSignals();
   InitPlatformSignalHandlers();
 
@@ -1066,26 +1105,26 @@ void Runtime::InitThreadGroups(Thread* self) {
       env->NewGlobalRef(env->GetStaticObjectField(
           WellKnownClasses::java_lang_ThreadGroup,
           WellKnownClasses::java_lang_ThreadGroup_mainThreadGroup));
-  CHECK(main_thread_group_ != NULL || IsCompiler());
+  CHECK(main_thread_group_ != NULL || IsAotCompiler());
   system_thread_group_ =
       env->NewGlobalRef(env->GetStaticObjectField(
           WellKnownClasses::java_lang_ThreadGroup,
           WellKnownClasses::java_lang_ThreadGroup_systemThreadGroup));
-  CHECK(system_thread_group_ != NULL || IsCompiler());
+  CHECK(system_thread_group_ != NULL || IsAotCompiler());
 }
 
 jobject Runtime::GetMainThreadGroup() const {
-  CHECK(main_thread_group_ != NULL || IsCompiler());
+  CHECK(main_thread_group_ != NULL || IsAotCompiler());
   return main_thread_group_;
 }
 
 jobject Runtime::GetSystemThreadGroup() const {
-  CHECK(system_thread_group_ != NULL || IsCompiler());
+  CHECK(system_thread_group_ != NULL || IsAotCompiler());
   return system_thread_group_;
 }
 
 jobject Runtime::GetSystemClassLoader() const {
-  CHECK(system_class_loader_ != NULL || IsCompiler());
+  CHECK(system_class_loader_ != NULL || IsAotCompiler());
   return system_class_loader_;
 }
 
@@ -1341,7 +1380,7 @@ mirror::ArtMethod* Runtime::CreateImtConflictMethod() {
   // TODO: use a special method for imt conflict method saves.
   method->SetDexMethodIndex(DexFile::kDexNoIndex);
   // When compiling, the code pointer will get set later when the image is loaded.
-  if (runtime->IsCompiler()) {
+  if (runtime->IsAotCompiler()) {
     size_t pointer_size = GetInstructionSetPointerSize(instruction_set_);
     method->SetEntryPointFromQuickCompiledCodePtrSize(nullptr, pointer_size);
   } else {
@@ -1350,6 +1389,10 @@ mirror::ArtMethod* Runtime::CreateImtConflictMethod() {
   return method.Get();
 }
 
+void Runtime::SetImtConflictMethod(mirror::ArtMethod* method) {
+  imt_conflict_method_ = GcRoot<mirror::ArtMethod>(method);
+}
+
 mirror::ArtMethod* Runtime::CreateResolutionMethod() {
   Thread* self = Thread::Current();
   Runtime* runtime = Runtime::Current();
@@ -1360,7 +1403,7 @@ mirror::ArtMethod* Runtime::CreateResolutionMethod() {
   // TODO: use a special method for resolution method saves
   method->SetDexMethodIndex(DexFile::kDexNoIndex);
   // When compiling, the code pointer will get set later when the image is loaded.
-  if (runtime->IsCompiler()) {
+  if (runtime->IsAotCompiler()) {
     size_t pointer_size = GetInstructionSetPointerSize(instruction_set_);
     method->SetEntryPointFromQuickCompiledCodePtrSize(nullptr, pointer_size);
   } else {
@@ -1491,14 +1534,14 @@ void Runtime::StartProfiler(const char* profile_output_filename) {
 
 // Transaction support.
 void Runtime::EnterTransactionMode(Transaction* transaction) {
-  DCHECK(IsCompiler());
+  DCHECK(IsAotCompiler());
   DCHECK(transaction != nullptr);
   DCHECK(!IsActiveTransaction());
   preinitialization_transaction_ = transaction;
 }
 
 void Runtime::ExitTransactionMode() {
-  DCHECK(IsCompiler());
+  DCHECK(IsAotCompiler());
   DCHECK(IsActiveTransaction());
   preinitialization_transaction_ = nullptr;
 }
@@ -1558,51 +1601,51 @@ void Runtime::RecordWriteFieldShort(mirror::Object* obj, MemberOffset field_offs
 
 void Runtime::RecordWriteField32(mirror::Object* obj, MemberOffset field_offset,
                                  uint32_t value, bool is_volatile) const {
-  DCHECK(IsCompiler());
+  DCHECK(IsAotCompiler());
   DCHECK(IsActiveTransaction());
   preinitialization_transaction_->RecordWriteField32(obj, field_offset, value, is_volatile);
 }
 
 void Runtime::RecordWriteField64(mirror::Object* obj, MemberOffset field_offset,
                                  uint64_t value, bool is_volatile) const {
-  DCHECK(IsCompiler());
+  DCHECK(IsAotCompiler());
   DCHECK(IsActiveTransaction());
   preinitialization_transaction_->RecordWriteField64(obj, field_offset, value, is_volatile);
 }
 
 void Runtime::RecordWriteFieldReference(mirror::Object* obj, MemberOffset field_offset,
                                         mirror::Object* value, bool is_volatile) const {
-  DCHECK(IsCompiler());
+  DCHECK(IsAotCompiler());
   DCHECK(IsActiveTransaction());
   preinitialization_transaction_->RecordWriteFieldReference(obj, field_offset, value, is_volatile);
 }
 
 void Runtime::RecordWriteArray(mirror::Array* array, size_t index, uint64_t value) const {
-  DCHECK(IsCompiler());
+  DCHECK(IsAotCompiler());
   DCHECK(IsActiveTransaction());
   preinitialization_transaction_->RecordWriteArray(array, index, value);
 }
 
 void Runtime::RecordStrongStringInsertion(mirror::String* s) const {
-  DCHECK(IsCompiler());
+  DCHECK(IsAotCompiler());
   DCHECK(IsActiveTransaction());
   preinitialization_transaction_->RecordStrongStringInsertion(s);
 }
 
 void Runtime::RecordWeakStringInsertion(mirror::String* s) const {
-  DCHECK(IsCompiler());
+  DCHECK(IsAotCompiler());
   DCHECK(IsActiveTransaction());
   preinitialization_transaction_->RecordWeakStringInsertion(s);
 }
 
 void Runtime::RecordStrongStringRemoval(mirror::String* s) const {
-  DCHECK(IsCompiler());
+  DCHECK(IsAotCompiler());
   DCHECK(IsActiveTransaction());
   preinitialization_transaction_->RecordStrongStringRemoval(s);
 }
 
 void Runtime::RecordWeakStringRemoval(mirror::String* s) const {
-  DCHECK(IsCompiler());
+  DCHECK(IsAotCompiler());
   DCHECK(IsActiveTransaction());
   preinitialization_transaction_->RecordWeakStringRemoval(s);
 }
@@ -1634,4 +1677,16 @@ void Runtime::AddCurrentRuntimeFeaturesAsDex2OatArguments(std::vector<std::strin
 void Runtime::UpdateProfilerState(int state) {
   VLOG(profiler) << "Profiler state updated to " << state;
 }
+
+void Runtime::CreateJit() {
+  CHECK(jit_options_.get() != nullptr);
+  std::string error_msg;
+  jit_.reset(jit::Jit::Create(jit_options_.get(), &error_msg));
+  if (jit_.get() != nullptr) {
+    compiler_callbacks_ = jit_->GetCompilerCallbacks();
+  } else {
+    LOG(WARNING) << "Failed to create JIT " << error_msg;
+  }
+}
+
 }  // namespace art
diff --git a/runtime/runtime.h b/runtime/runtime.h
index 944c8bd..5078b7f 100644
--- a/runtime/runtime.h
+++ b/runtime/runtime.h
@@ -48,6 +48,12 @@ namespace gc {
     class GarbageCollector;
   }  // namespace collector
 }  // namespace gc
+
+namespace jit {
+  class Jit;
+  class JitOptions;
+}  // namespace jit
+
 namespace mirror {
   class ArtMethod;
   class ClassLoader;
@@ -95,12 +101,18 @@ class Runtime {
   static bool Create(const RuntimeOptions& options, bool ignore_unrecognized)
       SHARED_TRYLOCK_FUNCTION(true, Locks::mutator_lock_);
 
+  // IsAotCompiler for compilers that don't have a running runtime. Only dex2oat currently.
+  bool IsAotCompiler() const {
+    return !UseJit() && IsCompiler();
+  }
+
+  // IsCompiler is any runtime which has a running compiler, either dex2oat or JIT.
   bool IsCompiler() const {
     return compiler_callbacks_ != nullptr;
   }
 
   bool CanRelocate() const {
-    return !IsCompiler() || compiler_callbacks_->IsRelocationPossible();
+    return !IsAotCompiler() || compiler_callbacks_->IsRelocationPossible();
   }
 
   bool ShouldRelocate() const {
@@ -339,9 +351,7 @@ class Runtime {
     return !imt_conflict_method_.IsNull();
   }
 
-  void SetImtConflictMethod(mirror::ArtMethod* method) {
-    imt_conflict_method_ = GcRoot<mirror::ArtMethod>(method);
-  }
+  void SetImtConflictMethod(mirror::ArtMethod* method);
   void SetImtUnimplementedMethod(mirror::ArtMethod* method) {
     imt_unimplemented_method_ = GcRoot<mirror::ArtMethod>(method);
   }
@@ -421,6 +431,14 @@ class Runtime {
     kUnload,
     kInitialize
   };
+
+  jit::Jit* GetJit() {
+    return jit_.get();
+  }
+  bool UseJit() const {
+    return jit_.get() != nullptr;
+  }
+
   void PreZygoteFork();
   bool InitZygote();
   void DidForkFromZygote(JNIEnv* env, NativeBridgeAction action, const char* isa);
@@ -525,6 +543,8 @@ class Runtime {
     return zygote_max_failed_boots_;
   }
 
+  void CreateJit();
+
  private:
   static void InitPlatformSignalHandlers();
 
@@ -604,6 +624,9 @@ class Runtime {
 
   JavaVMExt* java_vm_;
 
+  std::unique_ptr<jit::Jit> jit_;
+  std::unique_ptr<jit::JitOptions> jit_options_;
+
   // Fault message, printed when we get a SIGSEGV.
   Mutex fault_message_lock_ DEFAULT_MUTEX_ACQUIRED_AFTER;
   std::string fault_message_ GUARDED_BY(fault_message_lock_);
diff --git a/runtime/runtime_options.def b/runtime/runtime_options.def
index d9cc4d4..d072ffa 100644
--- a/runtime/runtime_options.def
+++ b/runtime/runtime_options.def
@@ -63,6 +63,9 @@ RUNTIME_OPTIONS_KEY (Unit,                IgnoreMaxFootprint)
 RUNTIME_OPTIONS_KEY (Unit,                LowMemoryMode)
 RUNTIME_OPTIONS_KEY (bool,                UseTLAB,                        false)
 RUNTIME_OPTIONS_KEY (bool,                EnableHSpaceCompactForOOM,      true)
+RUNTIME_OPTIONS_KEY (bool,                UseJIT,      false)
+RUNTIME_OPTIONS_KEY (unsigned int,        JITCompileThreshold, jit::Jit::kDefaultCompileThreshold)
+RUNTIME_OPTIONS_KEY (MemoryKiB,           JITCodeCacheCapacity, jit::JitCodeCache::kDefaultCapacity)
 RUNTIME_OPTIONS_KEY (MillisecondsToNanoseconds, \
                                           HSpaceCompactForOOMMinIntervalsMs,\
                                                                           MsToNs(100 * 1000))  // 100s
diff --git a/runtime/runtime_options.h b/runtime/runtime_options.h
index ebd52d7..7e59000 100644
--- a/runtime/runtime_options.h
+++ b/runtime/runtime_options.h
@@ -26,6 +26,8 @@
 #include "runtime/base/logging.h"
 #include "cmdline/unit.h"
 #include "jdwp/jdwp.h"
+#include "jit/jit.h"
+#include "jit/jit_code_cache.h"
 #include "gc/collector_type.h"
 #include "gc/space/large_object_space.h"
 #include "profiler_options.h"
diff --git a/runtime/signal_catcher.cc b/runtime/signal_catcher.cc
index e377542..26bf655 100644
--- a/runtime/signal_catcher.cc
+++ b/runtime/signal_catcher.cc
@@ -180,7 +180,7 @@ void* SignalCatcher::Run(void* arg) {
 
   Runtime* runtime = Runtime::Current();
   CHECK(runtime->AttachCurrentThread("Signal Catcher", true, runtime->GetSystemThreadGroup(),
-                                     !runtime->IsCompiler()));
+                                     !runtime->IsAotCompiler()));
 
   Thread* self = Thread::Current();
   DCHECK_NE(self->GetState(), kRunnable);
diff --git a/runtime/thread.cc b/runtime/thread.cc
index 3b48f49..79d0066 100644
--- a/runtime/thread.cc
+++ b/runtime/thread.cc
@@ -541,7 +541,7 @@ bool Thread::InitStackHwm() {
   // Set stack_end_ to the bottom of the stack saving space of stack overflows
 
   Runtime* runtime = Runtime::Current();
-  bool implicit_stack_check = !runtime->ExplicitStackOverflowChecks() && !runtime->IsCompiler();
+  bool implicit_stack_check = !runtime->ExplicitStackOverflowChecks() && !runtime->IsAotCompiler();
   ResetDefaultStackEnd();
 
   // Install the protected region if we are doing implicit overflow checks.
diff --git a/runtime/trace.cc b/runtime/trace.cc
index 0950abe..93b3877 100644
--- a/runtime/trace.cc
+++ b/runtime/trace.cc
@@ -298,7 +298,7 @@ void* Trace::RunSamplingThread(void* arg) {
   intptr_t interval_us = reinterpret_cast<intptr_t>(arg);
   CHECK_GE(interval_us, 0);
   CHECK(runtime->AttachCurrentThread("Sampling Profiler", true, runtime->GetSystemThreadGroup(),
-                                     !runtime->IsCompiler()));
+                                     !runtime->IsAotCompiler()));
 
   while (true) {
     usleep(interval_us);
@@ -627,6 +627,12 @@ void Trace::ExceptionCaught(Thread* thread, const ThrowLocation& throw_location,
   LOG(ERROR) << "Unexpected exception caught event in tracing";
 }
 
+void Trace::BackwardBranch(Thread* /*thread*/, mirror::ArtMethod* method,
+                           int32_t /*dex_pc_offset*/)
+      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
+  LOG(ERROR) << "Unexpected backward branch event in tracing" << PrettyMethod(method);
+}
+
 void Trace::ReadClocks(Thread* thread, uint32_t* thread_clock_diff, uint32_t* wall_clock_diff) {
   if (UseThreadCpuClock()) {
     uint64_t clock_base = thread->GetTraceClockBase();
diff --git a/runtime/trace.h b/runtime/trace.h
index ead1c29..9ba30d5 100644
--- a/runtime/trace.h
+++ b/runtime/trace.h
@@ -99,7 +99,8 @@ class Trace FINAL : public instrumentation::InstrumentationListener {
                        mirror::ArtMethod* catch_method, uint32_t catch_dex_pc,
                        mirror::Throwable* exception_object)
       SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) OVERRIDE;
-
+  void BackwardBranch(Thread* thread, mirror::ArtMethod* method, int32_t dex_pc_offset)
+      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) OVERRIDE;
   // Reuse an old stack trace if it exists, otherwise allocate a new one.
   static std::vector<mirror::ArtMethod*>* AllocStackTrace();
   // Clear and store an old stack trace for later use.
diff --git a/runtime/transaction.cc b/runtime/transaction.cc
index 7e2e0a6..e26f955 100644
--- a/runtime/transaction.cc
+++ b/runtime/transaction.cc
@@ -32,7 +32,7 @@ static constexpr bool kEnableTransactionStats = false;
 
 Transaction::Transaction()
   : log_lock_("transaction log lock", kTransactionLogLock), aborted_(false) {
-  CHECK(Runtime::Current()->IsCompiler());
+  CHECK(Runtime::Current()->IsAotCompiler());
 }
 
 Transaction::~Transaction() {
diff --git a/runtime/utils.cc b/runtime/utils.cc
index 85c9340..dea8f79 100644
--- a/runtime/utils.cc
+++ b/runtime/utils.cc
@@ -1262,9 +1262,9 @@ void DumpNativeStack(std::ostream& os, pid_t tid, const char* prefix,
           os << "+" << it->func_offset;
         }
         try_addr2line = true;
-      } else if (current_method != nullptr &&
-                 Locks::mutator_lock_->IsSharedHeld(Thread::Current()) &&
-                 current_method->PcIsWithinQuickCode(it->pc)) {
+      } else if (
+          current_method != nullptr && Locks::mutator_lock_->IsSharedHeld(Thread::Current()) &&
+          current_method->PcIsWithinQuickCode(it->pc)) {
         const void* start_of_code = current_method->GetEntryPointFromQuickCompiledCode();
         os << JniLongName(current_method) << "+"
            << (it->pc - reinterpret_cast<uintptr_t>(start_of_code));
diff --git a/runtime/verifier/method_verifier.cc b/runtime/verifier/method_verifier.cc
index 474a066..87a29ed 100644
--- a/runtime/verifier/method_verifier.cc
+++ b/runtime/verifier/method_verifier.cc
@@ -24,6 +24,7 @@
 #include "compiler_callbacks.h"
 #include "dex_file-inl.h"
 #include "dex_instruction-inl.h"
+#include "dex_instruction_utils.h"
 #include "dex_instruction_visitor.h"
 #include "gc/accounting/card_table-inl.h"
 #include "indenter.h"
@@ -111,6 +112,20 @@ static void SafelyMarkAllRegistersAsConflicts(MethodVerifier* verifier, Register
   reg_line->MarkAllRegistersAsConflicts(verifier);
 }
 
+MethodVerifier::FailureKind MethodVerifier::VerifyMethod(
+    mirror::ArtMethod* method, bool allow_soft_failures, std::string* error ATTRIBUTE_UNUSED) {
+  Thread* self = Thread::Current();
+  StackHandleScope<3> hs(self);
+  mirror::Class* klass = method->GetDeclaringClass();
+  auto h_dex_cache(hs.NewHandle(klass->GetDexCache()));
+  auto h_class_loader(hs.NewHandle(klass->GetClassLoader()));
+  auto h_method = hs.NewHandle(method);
+  return VerifyMethod(self, method->GetDexMethodIndex(), method->GetDexFile(), h_dex_cache,
+                      h_class_loader, klass->GetClassDef(), method->GetCodeItem(), h_method,
+                      method->GetAccessFlags(), allow_soft_failures, false);
+}
+
+
 MethodVerifier::FailureKind MethodVerifier::VerifyClass(Thread* self,
                                                         mirror::Class* klass,
                                                         bool allow_soft_failures,
@@ -136,7 +151,7 @@ MethodVerifier::FailureKind MethodVerifier::VerifyClass(Thread* self,
   }
   if (early_failure) {
     *error = "Verifier rejected class " + PrettyDescriptor(klass) + failure_message;
-    if (Runtime::Current()->IsCompiler()) {
+    if (Runtime::Current()->IsAotCompiler()) {
       ClassReference ref(&dex_file, klass->GetDexClassDefIndex());
       Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref);
     }
@@ -544,7 +559,7 @@ std::ostream& MethodVerifier::Fail(VerifyError error) {
     case VERIFY_ERROR_ACCESS_METHOD:
     case VERIFY_ERROR_INSTANTIATION:
     case VERIFY_ERROR_CLASS_CHANGE:
-      if (Runtime::Current()->IsCompiler() || !can_load_classes_) {
+      if (Runtime::Current()->IsAotCompiler() || !can_load_classes_) {
         // If we're optimistically running verification at compile time, turn NO_xxx, ACCESS_xxx,
         // class change and instantiation errors into soft verification errors so that we re-verify
         // at runtime. We may fail to find or to agree on access because of not yet available class
@@ -568,7 +583,7 @@ std::ostream& MethodVerifier::Fail(VerifyError error) {
       // Hard verification failures at compile time will still fail at runtime, so the class is
       // marked as rejected to prevent it from being compiled.
     case VERIFY_ERROR_BAD_CLASS_HARD: {
-      if (Runtime::Current()->IsCompiler()) {
+      if (Runtime::Current()->IsAotCompiler()) {
         ClassReference ref(dex_file_, dex_file_->GetIndexForClassDef(*class_def_));
         Runtime::Current()->GetCompilerCallbacks()->ClassRejected(ref);
       }
@@ -844,7 +859,7 @@ bool MethodVerifier::VerifyInstruction(const Instruction* inst, uint32_t code_of
       result = false;
       break;
   }
-  if (inst->GetVerifyIsRuntimeOnly() && Runtime::Current()->IsCompiler() && !verify_to_dump_) {
+  if (inst->GetVerifyIsRuntimeOnly() && Runtime::Current()->IsAotCompiler() && !verify_to_dump_) {
     Fail(VERIFY_ERROR_BAD_CLASS_HARD) << "opcode only expected at runtime " << inst->Name();
     result = false;
   }
@@ -2812,8 +2827,8 @@ bool MethodVerifier::CodeFlowVerifyInstruction(uint32_t* start_guess) {
   }
 
   if (have_pending_hard_failure_) {
-    if (Runtime::Current()->IsCompiler()) {
-      /* When compiling, check that the last failure is a hard failure */
+    if (Runtime::Current()->IsAotCompiler()) {
+      /* When AOT compiling, check that the last failure is a hard failure */
       CHECK_EQ(failures_[failures_.size() - 1], VERIFY_ERROR_BAD_CLASS_HARD);
     }
     /* immediate failure, reject class */
@@ -3941,28 +3956,16 @@ void MethodVerifier::VerifyISFieldAccess(const Instruction* inst, const RegType&
 
 mirror::ArtField* MethodVerifier::GetQuickFieldAccess(const Instruction* inst,
                                                       RegisterLine* reg_line) {
-  DCHECK(inst->Opcode() == Instruction::IGET_QUICK ||
-         inst->Opcode() == Instruction::IGET_WIDE_QUICK ||
-         inst->Opcode() == Instruction::IGET_OBJECT_QUICK ||
-         inst->Opcode() == Instruction::IGET_BOOLEAN_QUICK ||
-         inst->Opcode() == Instruction::IGET_BYTE_QUICK ||
-         inst->Opcode() == Instruction::IGET_CHAR_QUICK ||
-         inst->Opcode() == Instruction::IGET_SHORT_QUICK ||
-         inst->Opcode() == Instruction::IPUT_QUICK ||
-         inst->Opcode() == Instruction::IPUT_WIDE_QUICK ||
-         inst->Opcode() == Instruction::IPUT_OBJECT_QUICK ||
-         inst->Opcode() == Instruction::IPUT_BOOLEAN_QUICK ||
-         inst->Opcode() == Instruction::IPUT_BYTE_QUICK ||
-         inst->Opcode() == Instruction::IPUT_CHAR_QUICK ||
-         inst->Opcode() == Instruction::IPUT_SHORT_QUICK);
+  DCHECK(IsInstructionIGetQuickOrIPutQuick(inst->Opcode())) << inst->Opcode();
   const RegType& object_type = reg_line->GetRegisterType(this, inst->VRegB_22c());
   if (!object_type.HasClass()) {
     VLOG(verifier) << "Failed to get mirror::Class* from '" << object_type << "'";
     return nullptr;
   }
   uint32_t field_offset = static_cast<uint32_t>(inst->VRegC_22c());
-  mirror::ArtField* f = mirror::ArtField::FindInstanceFieldWithOffset(object_type.GetClass(),
-                                                                      field_offset);
+  mirror::ArtField* const f = mirror::ArtField::FindInstanceFieldWithOffset(object_type.GetClass(),
+                                                                            field_offset);
+  DCHECK_EQ(f->GetOffset().Uint32Value(), field_offset);
   if (f == nullptr) {
     VLOG(verifier) << "Failed to find instance field at offset '" << field_offset
                    << "' from '" << PrettyDescriptor(object_type.GetClass()) << "'";
diff --git a/runtime/verifier/method_verifier.h b/runtime/verifier/method_verifier.h
index b83e647..bdd6259 100644
--- a/runtime/verifier/method_verifier.h
+++ b/runtime/verifier/method_verifier.h
@@ -156,6 +156,9 @@ class MethodVerifier {
                                              uint32_t method_access_flags)
       SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
 
+  static FailureKind VerifyMethod(mirror::ArtMethod* method, bool allow_soft_failures,
+                                  std::string* error) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+
   uint8_t EncodePcToReferenceMapData() const;
 
   uint32_t DexFileVersion() const {
@@ -239,10 +242,14 @@ class MethodVerifier {
   bool HasFailures() const;
   const RegType& ResolveCheckedClass(uint32_t class_idx)
       SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
-  mirror::ArtMethod* GetQuickInvokedMethod(const Instruction* inst,
-                                           RegisterLine* reg_line,
+  // Returns the method of a quick invoke or nullptr if it cannot be found.
+  mirror::ArtMethod* GetQuickInvokedMethod(const Instruction* inst, RegisterLine* reg_line,
                                            bool is_range)
-        SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+  // Returns the access field of a quick field access (iget/iput-quick) or nullptr
+  // if it cannot be found.
+  mirror::ArtField* GetQuickFieldAccess(const Instruction* inst, RegisterLine* reg_line)
+      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
 
   // Is the method being verified a constructor?
   bool IsConstructor() const {
@@ -532,11 +539,6 @@ class MethodVerifier {
                            bool is_primitive, bool is_static)
       SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
 
-  // Returns the access field of a quick field access (iget/iput-quick) or nullptr
-  // if it cannot be found.
-  mirror::ArtField* GetQuickFieldAccess(const Instruction* inst, RegisterLine* reg_line)
-      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
-
   template <FieldAccessType kAccType>
   void VerifyQuickFieldAccess(const Instruction* inst, const RegType& insn_type, bool is_primitive)
       SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
diff --git a/test/Android.run-test.mk b/test/Android.run-test.mk
index 8e4b46b..41c8da6 100644
--- a/test/Android.run-test.mk
+++ b/test/Android.run-test.mk
@@ -84,6 +84,9 @@ endif
 ifeq ($(ART_TEST_INTERPRETER),true)
   COMPILER_TYPES += interpreter
 endif
+ifeq ($(ART_TEST_JIT),true)
+  COMPILER_TYPES += jit
+endif
 ifeq ($(ART_TEST_OPTIMIZING),true)
   COMPILER_TYPES += optimizing
 endif
@@ -497,7 +500,12 @@ define define-test-art-run-test
         test_groups += ART_RUN_TEST_$$(uc_host_or_target)_DEFAULT_RULES
         run_test_options += --quick
       else
-        $$(error found $(4) expected $(COMPILER_TYPES))
+        ifeq ($(4),jit)
+          test_groups += ART_RUN_TEST_$$(uc_host_or_target)_DEFAULT_RULES
+          run_test_options += --jit
+        else
+          $$(error found $(4) expected $(COMPILER_TYPES))
+        endif
       endif
     endif
   endif
diff --git a/test/etc/run-test-jar b/test/etc/run-test-jar
index f64756b..ee40ee8 100755
--- a/test/etc/run-test-jar
+++ b/test/etc/run-test-jar
@@ -26,6 +26,7 @@ GDB_SERVER="gdbserver"
 HAVE_IMAGE="y"
 HOST="n"
 INTERPRETER="n"
+JIT="n"
 INVOKE_WITH=""
 ISA=x86
 LIBRARY_DIRECTORY="lib"
@@ -127,6 +128,9 @@ while true; do
     elif [ "x$1" = "x--interpreter" ]; then
         INTERPRETER="y"
         shift
+    elif [ "x$1" = "x--jit" ]; then
+        JIT="y"
+        shift
     elif [ "x$1" = "x--jvm" ]; then
         USE_JVM="y"
         shift
@@ -260,6 +264,16 @@ if [ "$INTERPRETER" = "y" ]; then
     fi
 fi
 
+if [ "$JIT" = "y" ]; then
+    INT_OPTS="-Xjit"
+    if [ "$VERIFY" = "y" ] ; then
+      COMPILE_FLAGS="${COMPILE_FLAGS} --compiler-filter=interpret-only"
+    else
+      COMPILE_FLAGS="${COMPILE_FLAGS} --compiler-filter=verify-none"
+      DEX_VERIFY="${DEX_VERIFY} -Xverify:none"
+    fi
+fi
+
 JNI_OPTS="-Xjnigreflimit:512 -Xcheck:jni"
 
 if [ "$RELOCATE" = "y" ]; then
diff --git a/test/run-all-tests b/test/run-all-tests
index 318a0de..d0b3cf9 100755
--- a/test/run-all-tests
+++ b/test/run-all-tests
@@ -53,6 +53,9 @@ while true; do
     elif [ "x$1" = "x--interpreter" ]; then
         run_args="${run_args} --interpreter"
         shift
+    elif [ "x$1" = "x--jit" ]; then
+        run_args="${run_args} --jit"
+        shift
     elif [ "x$1" = "x--no-verify" ]; then
         run_args="${run_args} --no-verify"
         shift
@@ -126,7 +129,7 @@ if [ "$usage" = "yes" ]; then
         echo "  $prog [options]  Run all tests with the given options."
         echo "  Options are all passed to run-test; refer to that for " \
              "further documentation:"
-        echo "    --debug --dev --host --interpreter --jvm --no-optimize"
+        echo "    --debug --dev --host --interpreter --jit --jvm --no-optimize"
         echo "    --no-verify -O --update --valgrind --zygote --64 --relocate"
         echo "    --prebuild --always-clean --gcstress --gcverify --trace"
         echo "    --no-patchoat --no-dex2oat"
diff --git a/test/run-test b/test/run-test
index 8c47663..8bc4151 100755
--- a/test/run-test
+++ b/test/run-test
@@ -193,6 +193,9 @@ while true; do
         run_args="${run_args} --interpreter"
         image_suffix="-interpreter"
         shift
+    elif [ "x$1" = "x--jit" ]; then
+        run_args="${run_args} --jit"
+        shift
     elif [ "x$1" = "x--optimizing" ]; then
         run_args="${run_args} -Xcompiler-option --compiler-backend=Optimizing"
         image_suffix="-optimizing"
@@ -430,6 +433,7 @@ if [ "$usage" = "yes" ]; then
         echo "    --gdb                 Run under gdb; incompatible with some tests."
         echo "    --build-only          Build test files only (off by default)."
         echo "    --interpreter         Enable interpreter only mode (off by default)."
+        echo "    --jit                 Enable jit (off by default)."
         echo "    --optimizing          Enable optimizing compiler (off by default)."
         echo "    --quick               Use Quick compiler (default)."
         echo "    --no-verify           Turn off verification (on by default)."