Revert "Implement suspend checks in new compiler."

This reverts commit 6fbce029fba3ed5da6c36017754ed408e6bcb632.

Change-Id: Ia915c27873b021e658a10212e559095dfc91284e

7 files changed, 5 insertions, 229 deletions

diff --git a/compiler/optimizing/builder.cc b/compiler/optimizing/builder.cc
index 71e71f7..ecd6802 100644
--- a/compiler/optimizing/builder.cc
+++ b/compiler/optimizing/builder.cc
@@ -138,15 +138,13 @@ static bool CanHandleCodeItem(const DexFile::CodeItem& code_item) {
 
 template<typename T>
 void HGraphBuilder::If_22t(const Instruction& instruction, uint32_t dex_offset) {
-  int32_t target_offset = instruction.GetTargetOffset();
-  PotentiallyAddSuspendCheck(target_offset, dex_offset);
   HInstruction* first = LoadLocal(instruction.VRegA(), Primitive::kPrimInt);
   HInstruction* second = LoadLocal(instruction.VRegB(), Primitive::kPrimInt);
   T* comparison = new (arena_) T(first, second);
   current_block_->AddInstruction(comparison);
   HInstruction* ifinst = new (arena_) HIf(comparison);
   current_block_->AddInstruction(ifinst);
-  HBasicBlock* target = FindBlockStartingAt(dex_offset + target_offset);
+  HBasicBlock* target = FindBlockStartingAt(dex_offset + instruction.GetTargetOffset());
   DCHECK(target != nullptr);
   current_block_->AddSuccessor(target);
   target = FindBlockStartingAt(dex_offset + instruction.SizeInCodeUnits());
@@ -157,15 +155,12 @@ void HGraphBuilder::If_22t(const Instruction& instruction, uint32_t dex_offset)
 
 template<typename T>
 void HGraphBuilder::If_21t(const Instruction& instruction, uint32_t dex_offset) {
-  int32_t target_offset = instruction.GetTargetOffset();
-  PotentiallyAddSuspendCheck(target_offset, dex_offset);
   HInstruction* value = LoadLocal(instruction.VRegA(), Primitive::kPrimInt);
   T* comparison = new (arena_) T(value, GetIntConstant(0));
   current_block_->AddInstruction(comparison);
   HInstruction* ifinst = new (arena_) HIf(comparison);
   current_block_->AddInstruction(ifinst);
-  fprintf(stderr, "%d and %d\n", dex_offset, target_offset);
-  HBasicBlock* target = FindBlockStartingAt(dex_offset + target_offset);
+  HBasicBlock* target = FindBlockStartingAt(dex_offset + instruction.GetTargetOffset());
   DCHECK(target != nullptr);
   current_block_->AddSuccessor(target);
   target = FindBlockStartingAt(dex_offset + instruction.SizeInCodeUnits());
@@ -201,9 +196,6 @@ HGraph* HGraphBuilder::BuildGraph(const DexFile::CodeItem& code_item) {
     return nullptr;
   }
 
-  // Add the suspend check to the entry block.
-  entry_block_->AddInstruction(new (arena_) HSuspendCheck(0));
-
   size_t dex_offset = 0;
   while (code_ptr < code_end) {
     // Update the current block if dex_offset starts a new block.
@@ -470,15 +462,7 @@ void HGraphBuilder::BuildArrayAccess(const Instruction& instruction,
   }
 }
 
-void HGraphBuilder::PotentiallyAddSuspendCheck(int32_t target_offset, uint32_t dex_offset) {
-  if (target_offset <= 0) {
-    // Unconditionnally add a suspend check to backward branches. We can remove
-    // them after we recognize loops in the graph.
-    current_block_->AddInstruction(new (arena_) HSuspendCheck(dex_offset));
-  }
-}
-
-bool HGraphBuilder::AnalyzeDexInstruction(const Instruction& instruction, uint32_t dex_offset) {
+bool HGraphBuilder::AnalyzeDexInstruction(const Instruction& instruction, int32_t dex_offset) {
   if (current_block_ == nullptr) {
     return true;  // Dead code
   }
@@ -596,9 +580,7 @@ bool HGraphBuilder::AnalyzeDexInstruction(const Instruction& instruction, uint32
     case Instruction::GOTO:
     case Instruction::GOTO_16:
     case Instruction::GOTO_32: {
-      int32_t offset = instruction.GetTargetOffset();
-      PotentiallyAddSuspendCheck(offset, dex_offset);
-      HBasicBlock* target = FindBlockStartingAt(offset + dex_offset);
+      HBasicBlock* target = FindBlockStartingAt(instruction.GetTargetOffset() + dex_offset);
       DCHECK(target != nullptr);
       current_block_->AddInstruction(new (arena_) HGoto());
       current_block_->AddSuccessor(target);
diff --git a/compiler/optimizing/builder.h b/compiler/optimizing/builder.h
index e143786..170c427 100644
--- a/compiler/optimizing/builder.h
+++ b/compiler/optimizing/builder.h
@@ -54,7 +54,7 @@ class HGraphBuilder : public ValueObject {
   // Analyzes the dex instruction and adds HInstruction to the graph
   // to execute that instruction. Returns whether the instruction can
   // be handled.
-  bool AnalyzeDexInstruction(const Instruction& instruction, uint32_t dex_offset);
+  bool AnalyzeDexInstruction(const Instruction& instruction, int32_t dex_offset);
 
   // Finds all instructions that start a new block, and populates branch_targets_ with
   // the newly created blocks.
@@ -70,7 +70,6 @@ class HGraphBuilder : public ValueObject {
   HLocal* GetLocalAt(int register_index) const;
   void UpdateLocal(int register_index, HInstruction* instruction) const;
   HInstruction* LoadLocal(int register_index, Primitive::Type type) const;
-  void PotentiallyAddSuspendCheck(int32_t target_offset, uint32_t dex_offset);
 
   // Temporarily returns whether the compiler supports the parameters
   // of the method.
diff --git a/compiler/optimizing/code_generator_arm.cc b/compiler/optimizing/code_generator_arm.cc
index 9903092..e72e39b 100644
--- a/compiler/optimizing/code_generator_arm.cc
+++ b/compiler/optimizing/code_generator_arm.cc
@@ -90,29 +90,6 @@ class StackOverflowCheckSlowPathARM : public SlowPathCode {
   DISALLOW_COPY_AND_ASSIGN(StackOverflowCheckSlowPathARM);
 };
 
-class SuspendCheckSlowPathARM : public SlowPathCode {
- public:
-  explicit SuspendCheckSlowPathARM(HSuspendCheck* instruction)
-      : instruction_(instruction) {}
-
-  virtual void EmitNativeCode(CodeGenerator* codegen) OVERRIDE {
-    __ Bind(GetEntryLabel());
-    int32_t offset = QUICK_ENTRYPOINT_OFFSET(kArmWordSize, pTestSuspend).Int32Value();
-    __ ldr(LR, Address(TR, offset));
-    __ blx(LR);
-    codegen->RecordPcInfo(instruction_, instruction_->GetDexPc());
-    __ b(GetReturnLabel());
-  }
-
-  Label* GetReturnLabel() { return &return_label_; }
-
- private:
-  HSuspendCheck* const instruction_;
-  Label return_label_;
-
-  DISALLOW_COPY_AND_ASSIGN(SuspendCheckSlowPathARM);
-};
-
 class BoundsCheckSlowPathARM : public SlowPathCode {
  public:
   explicit BoundsCheckSlowPathARM(HBoundsCheck* instruction,
@@ -1517,21 +1494,6 @@ void InstructionCodeGeneratorARM::VisitParallelMove(HParallelMove* instruction)
   codegen_->GetMoveResolver()->EmitNativeCode(instruction);
 }
 
-void LocationsBuilderARM::VisitSuspendCheck(HSuspendCheck* instruction) {
-  new (GetGraph()->GetArena()) LocationSummary(instruction, LocationSummary::kCallOnSlowPath);
-}
-
-void InstructionCodeGeneratorARM::VisitSuspendCheck(HSuspendCheck* instruction) {
-  SuspendCheckSlowPathARM* slow_path =
-      new (GetGraph()->GetArena()) SuspendCheckSlowPathARM(instruction);
-  codegen_->AddSlowPath(slow_path);
-
-  __ AddConstant(R4, R4, -1);
-  __ cmp(R4, ShifterOperand(0));
-  __ b(slow_path->GetEntryLabel(), LE);
-  __ Bind(slow_path->GetReturnLabel());
-}
-
 ArmAssembler* ParallelMoveResolverARM::GetAssembler() const {
   return codegen_->GetAssembler();
 }
diff --git a/compiler/optimizing/code_generator_x86.cc b/compiler/optimizing/code_generator_x86.cc
index 2ecc46e..6602d3f 100644
--- a/compiler/optimizing/code_generator_x86.cc
+++ b/compiler/optimizing/code_generator_x86.cc
@@ -114,27 +114,6 @@ class BoundsCheckSlowPathX86 : public SlowPathCode {
   DISALLOW_COPY_AND_ASSIGN(BoundsCheckSlowPathX86);
 };
 
-class SuspendCheckSlowPathX86 : public SlowPathCode {
- public:
-  explicit SuspendCheckSlowPathX86(HSuspendCheck* instruction)
-      : instruction_(instruction) {}
-
-  virtual void EmitNativeCode(CodeGenerator* codegen) OVERRIDE {
-    __ Bind(GetEntryLabel());
-    __ fs()->call(Address::Absolute(QUICK_ENTRYPOINT_OFFSET(kX86WordSize, pTestSuspend)));
-    codegen->RecordPcInfo(instruction_, instruction_->GetDexPc());
-    __ jmp(GetReturnLabel());
-  }
-
-  Label* GetReturnLabel() { return &return_label_; }
-
- private:
-  HSuspendCheck* const instruction_;
-  Label return_label_;
-
-  DISALLOW_COPY_AND_ASSIGN(SuspendCheckSlowPathX86);
-};
-
 #undef __
 #define __ reinterpret_cast<X86Assembler*>(GetAssembler())->
 
@@ -1504,20 +1483,6 @@ void InstructionCodeGeneratorX86::VisitParallelMove(HParallelMove* instruction)
   codegen_->GetMoveResolver()->EmitNativeCode(instruction);
 }
 
-void LocationsBuilderX86::VisitSuspendCheck(HSuspendCheck* instruction) {
-  new (GetGraph()->GetArena()) LocationSummary(instruction, LocationSummary::kCall);
-}
-
-void InstructionCodeGeneratorX86::VisitSuspendCheck(HSuspendCheck* instruction) {
-  SuspendCheckSlowPathX86* slow_path =
-      new (GetGraph()->GetArena()) SuspendCheckSlowPathX86(instruction);
-  codegen_->AddSlowPath(slow_path);
-  __ fs()->cmpl(Address::Absolute(
-      Thread::ThreadFlagsOffset<kX86WordSize>().Int32Value()), Immediate(0));
-  __ j(kNotEqual, slow_path->GetEntryLabel());
-  __ Bind(slow_path->GetReturnLabel());
-}
-
 X86Assembler* ParallelMoveResolverX86::GetAssembler() const {
   return codegen_->GetAssembler();
 }
diff --git a/compiler/optimizing/code_generator_x86_64.cc b/compiler/optimizing/code_generator_x86_64.cc
index 2f352e0..b2d81e3 100644
--- a/compiler/optimizing/code_generator_x86_64.cc
+++ b/compiler/optimizing/code_generator_x86_64.cc
@@ -95,27 +95,6 @@ class StackOverflowCheckSlowPathX86_64 : public SlowPathCode {
   DISALLOW_COPY_AND_ASSIGN(StackOverflowCheckSlowPathX86_64);
 };
 
-class SuspendCheckSlowPathX86_64 : public SlowPathCode {
- public:
-  explicit SuspendCheckSlowPathX86_64(HSuspendCheck* instruction)
-      : instruction_(instruction) {}
-
-  virtual void EmitNativeCode(CodeGenerator* codegen) OVERRIDE {
-    __ Bind(GetEntryLabel());
-    __ gs()->call(Address::Absolute(QUICK_ENTRYPOINT_OFFSET(kX86_64WordSize, pTestSuspend), true));
-    codegen->RecordPcInfo(instruction_, instruction_->GetDexPc());
-    __ jmp(GetReturnLabel());
-  }
-
-  Label* GetReturnLabel() { return &return_label_; }
-
- private:
-  HSuspendCheck* const instruction_;
-  Label return_label_;
-
-  DISALLOW_COPY_AND_ASSIGN(SuspendCheckSlowPathX86_64);
-};
-
 class BoundsCheckSlowPathX86_64 : public SlowPathCode {
  public:
   explicit BoundsCheckSlowPathX86_64(HBoundsCheck* instruction,
@@ -1350,20 +1329,6 @@ void InstructionCodeGeneratorX86_64::VisitParallelMove(HParallelMove* instructio
   codegen_->GetMoveResolver()->EmitNativeCode(instruction);
 }
 
-void LocationsBuilderX86_64::VisitSuspendCheck(HSuspendCheck* instruction) {
-  new (GetGraph()->GetArena()) LocationSummary(instruction, LocationSummary::kCallOnSlowPath);
-}
-
-void InstructionCodeGeneratorX86_64::VisitSuspendCheck(HSuspendCheck* instruction) {
-  SuspendCheckSlowPathX86_64* slow_path =
-      new (GetGraph()->GetArena()) SuspendCheckSlowPathX86_64(instruction);
-  codegen_->AddSlowPath(slow_path);
-  __ gs()->cmpl(Address::Absolute(
-      Thread::ThreadFlagsOffset<kX86_64WordSize>().Int32Value(), true), Immediate(0));
-  __ j(kNotEqual, slow_path->GetEntryLabel());
-  __ Bind(slow_path->GetReturnLabel());
-}
-
 X86_64Assembler* ParallelMoveResolverX86_64::GetAssembler() const {
   return codegen_->GetAssembler();
 }
diff --git a/compiler/optimizing/nodes.h b/compiler/optimizing/nodes.h
index ed6dd93..9018fee 100644
--- a/compiler/optimizing/nodes.h
+++ b/compiler/optimizing/nodes.h
@@ -443,7 +443,6 @@ class HBasicBlock : public ArenaObject {
   M(BoundsCheck)                                           \
   M(NullCheck)                                             \
   M(Temporary)                                             \
-  M(SuspendCheck)                                          \
 
 #define FOR_EACH_INSTRUCTION(M)                            \
   FOR_EACH_CONCRETE_INSTRUCTION(M)                         \
@@ -1594,25 +1593,6 @@ class HTemporary : public HTemplateInstruction<0> {
   DISALLOW_COPY_AND_ASSIGN(HTemporary);
 };
 
-class HSuspendCheck : public HTemplateInstruction<0> {
- public:
-  explicit HSuspendCheck(uint32_t dex_pc)
-      : HTemplateInstruction(SideEffects::ChangesSomething()), dex_pc_(dex_pc) {}
-
-  virtual bool NeedsEnvironment() const {
-    return true;
-  }
-
-  uint32_t GetDexPc() const { return dex_pc_; }
-
-  DECLARE_INSTRUCTION(SuspendCheck);
-
- private:
-  const uint32_t dex_pc_;
-
-  DISALLOW_COPY_AND_ASSIGN(HSuspendCheck);
-};
-
 class MoveOperands : public ArenaObject {
  public:
   MoveOperands(Location source, Location destination)
diff --git a/compiler/optimizing/suspend_check_test.cc b/compiler/optimizing/suspend_check_test.cc
deleted file mode 100644
index 65fc2d8..0000000
--- a/compiler/optimizing/suspend_check_test.cc
+++ /dev/null
@@ -1,77 +0,0 @@
-/*
- * Copyright (C) 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 "builder.h"
-#include "dex_instruction.h"
-#include "nodes.h"
-#include "optimizing_unit_test.h"
-
-#include "gtest/gtest.h"
-
-namespace art {
-
-/**
- * Check that the HGraphBuilder adds suspend checks to backward branches.
- */
-
-static void TestCode(const uint16_t* data) {
-  ArenaPool pool;
-  ArenaAllocator allocator(&pool);
-  HGraphBuilder builder(&allocator);
-  const DexFile::CodeItem* item = reinterpret_cast<const DexFile::CodeItem*>(data);
-  HGraph* graph = builder.BuildGraph(*item);
-  ASSERT_NE(graph, nullptr);
-
-  HBasicBlock* first_block = graph->GetEntryBlock()->GetSuccessors().Get(0);
-  HInstruction* first_instruction = first_block->GetFirstInstruction();
-  // Account for some tests having a store local as first instruction.
-  ASSERT_TRUE(first_instruction->IsSuspendCheck()
-              || first_instruction->GetNext()->IsSuspendCheck());
-}
-
-TEST(CodegenTest, CFG1) {
-  const uint16_t data[] = ZERO_REGISTER_CODE_ITEM(
-    Instruction::NOP,
-    Instruction::GOTO | 0xFF00);
-
-  TestCode(data);
-}
-
-TEST(CodegenTest, CFG2) {
-  const uint16_t data[] = ZERO_REGISTER_CODE_ITEM(
-    Instruction::GOTO_32, 0, 0);
-
-  TestCode(data);
-}
-
-TEST(CodegenTest, CFG3) {
-  const uint16_t data[] = ONE_REGISTER_CODE_ITEM(
-    Instruction::CONST_4 | 0 | 0,
-    Instruction::IF_EQ, 0xFFFF,
-    Instruction::RETURN_VOID);
-
-  TestCode(data);
-}
-
-TEST(CodegenTest, CFG4) {
-  const uint16_t data[] = ONE_REGISTER_CODE_ITEM(
-    Instruction::CONST_4 | 0 | 0,
-    Instruction::IF_NE, 0xFFFF,
-    Instruction::RETURN_VOID);
-
-  TestCode(data);
-}
-}  // namespace art