diff options
Diffstat (limited to 'runtime/stack.cc')
| -rw-r--r-- | runtime/stack.cc | 362 |
1 files changed, 362 insertions, 0 deletions
diff --git a/runtime/stack.cc b/runtime/stack.cc new file mode 100644 index 0000000..fcd0f2d --- /dev/null +++ b/runtime/stack.cc @@ -0,0 +1,362 @@ +/* + * Copyright (C) 2011 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 "stack.h" + +#include "oat/runtime/context.h" +#include "mirror/abstract_method-inl.h" +#include "mirror/class-inl.h" +#include "mirror/object.h" +#include "mirror/object-inl.h" +#include "mirror/object_array-inl.h" +#include "object_utils.h" +#include "thread_list.h" +#include "throw_location.h" + +namespace art { + +mirror::Object* ShadowFrame::GetThisObject() const { + mirror::AbstractMethod* m = GetMethod(); + if (m->IsStatic()) { + return NULL; + } else if (m->IsNative()) { + return GetVRegReference(0); + } else { + const DexFile::CodeItem* code_item = MethodHelper(m).GetCodeItem(); + CHECK(code_item != NULL) << PrettyMethod(m); + uint16_t reg = code_item->registers_size_ - code_item->ins_size_; + return GetVRegReference(reg); + } +} + +mirror::Object* ShadowFrame::GetThisObject(uint16_t num_ins) const { + mirror::AbstractMethod* m = GetMethod(); + if (m->IsStatic()) { + return NULL; + } else { + return GetVRegReference(NumberOfVRegs() - num_ins); + } +} + +ThrowLocation ShadowFrame::GetCurrentLocationForThrow() const { + return ThrowLocation(GetThisObject(), GetMethod(), GetDexPC()); +} + +size_t ManagedStack::NumJniShadowFrameReferences() const { + size_t count = 0; + for (const ManagedStack* current_fragment = this; current_fragment != NULL; + current_fragment = current_fragment->GetLink()) { + for (ShadowFrame* current_frame = current_fragment->top_shadow_frame_; current_frame != NULL; + current_frame = current_frame->GetLink()) { + if (current_frame->GetMethod()->IsNative()) { + // The JNI ShadowFrame only contains references. (For indirect reference.) + count += current_frame->NumberOfVRegs(); + } + } + } + return count; +} + +bool ManagedStack::ShadowFramesContain(mirror::Object** shadow_frame_entry) const { + for (const ManagedStack* current_fragment = this; current_fragment != NULL; + current_fragment = current_fragment->GetLink()) { + for (ShadowFrame* current_frame = current_fragment->top_shadow_frame_; current_frame != NULL; + current_frame = current_frame->GetLink()) { + if (current_frame->Contains(shadow_frame_entry)) { + return true; + } + } + } + return false; +} + +StackVisitor::StackVisitor(Thread* thread, Context* context) + : thread_(thread), cur_shadow_frame_(NULL), + cur_quick_frame_(NULL), cur_quick_frame_pc_(0), num_frames_(0), cur_depth_(0), + context_(context) { + DCHECK(thread == Thread::Current() || thread->IsSuspended()) << *thread; +} + +uint32_t StackVisitor::GetDexPc() const { + if (cur_shadow_frame_ != NULL) { + return cur_shadow_frame_->GetDexPC(); + } else if (cur_quick_frame_ != NULL) { + return GetMethod()->ToDexPc(cur_quick_frame_pc_); + } else { + return 0; + } +} + +mirror::Object* StackVisitor::GetThisObject() const { + mirror::AbstractMethod* m = GetMethod(); + if (m->IsStatic()) { + return NULL; + } else if (m->IsNative()) { + if (cur_quick_frame_ != NULL) { + StackIndirectReferenceTable* sirt = + reinterpret_cast<StackIndirectReferenceTable*>( + reinterpret_cast<char*>(cur_quick_frame_) + + m->GetSirtOffsetInBytes()); + return sirt->GetReference(0); + } else { + return cur_shadow_frame_->GetVRegReference(0); + } + } else { + const DexFile::CodeItem* code_item = MethodHelper(m).GetCodeItem(); + if (code_item == NULL) { + UNIMPLEMENTED(ERROR) << "Failed to determine this object of abstract or proxy method" + << PrettyMethod(m); + return NULL; + } else { + uint16_t reg = code_item->registers_size_ - code_item->ins_size_; + return reinterpret_cast<mirror::Object*>(GetVReg(m, reg, kReferenceVReg)); + } + } +} + +size_t StackVisitor::GetNativePcOffset() const { + DCHECK(!IsShadowFrame()); + return GetMethod()->NativePcOffset(cur_quick_frame_pc_); +} + +uint32_t StackVisitor::GetVReg(mirror::AbstractMethod* m, uint16_t vreg, VRegKind kind) const { + if (cur_quick_frame_ != NULL) { + DCHECK(context_ != NULL); // You can't reliably read registers without a context. + DCHECK(m == GetMethod()); + const VmapTable vmap_table(m->GetVmapTableRaw()); + uint32_t vmap_offset; + // TODO: IsInContext stops before spotting floating point registers. + if (vmap_table.IsInContext(vreg, vmap_offset, kind)) { + bool is_float = (kind == kFloatVReg) || (kind == kDoubleLoVReg) || (kind == kDoubleHiVReg); + uint32_t spill_mask = is_float ? m->GetFpSpillMask() + : m->GetCoreSpillMask(); + return GetGPR(vmap_table.ComputeRegister(spill_mask, vmap_offset, kind)); + } else { + const DexFile::CodeItem* code_item = MethodHelper(m).GetCodeItem(); + DCHECK(code_item != NULL) << PrettyMethod(m); // Can't be NULL or how would we compile its instructions? + size_t frame_size = m->GetFrameSizeInBytes(); + return GetVReg(cur_quick_frame_, code_item, m->GetCoreSpillMask(), m->GetFpSpillMask(), + frame_size, vreg); + } + } else { + return cur_shadow_frame_->GetVReg(vreg); + } +} + +void StackVisitor::SetVReg(mirror::AbstractMethod* m, uint16_t vreg, uint32_t new_value, + VRegKind kind) { + if (cur_quick_frame_ != NULL) { + DCHECK(context_ != NULL); // You can't reliably write registers without a context. + DCHECK(m == GetMethod()); + const VmapTable vmap_table(m->GetVmapTableRaw()); + uint32_t vmap_offset; + // TODO: IsInContext stops before spotting floating point registers. + if (vmap_table.IsInContext(vreg, vmap_offset, kind)) { + bool is_float = (kind == kFloatVReg) || (kind == kDoubleLoVReg) || (kind == kDoubleHiVReg); + uint32_t spill_mask = is_float ? m->GetFpSpillMask() : m->GetCoreSpillMask(); + const uint32_t reg = vmap_table.ComputeRegister(spill_mask, vmap_offset, kReferenceVReg); + SetGPR(reg, new_value); + } else { + const DexFile::CodeItem* code_item = MethodHelper(m).GetCodeItem(); + DCHECK(code_item != NULL) << PrettyMethod(m); // Can't be NULL or how would we compile its instructions? + uint32_t core_spills = m->GetCoreSpillMask(); + uint32_t fp_spills = m->GetFpSpillMask(); + size_t frame_size = m->GetFrameSizeInBytes(); + int offset = GetVRegOffset(code_item, core_spills, fp_spills, frame_size, vreg); + byte* vreg_addr = reinterpret_cast<byte*>(GetCurrentQuickFrame()) + offset; + *reinterpret_cast<uint32_t*>(vreg_addr) = new_value; + } + } else { + return cur_shadow_frame_->SetVReg(vreg, new_value); + } +} + +uintptr_t StackVisitor::GetGPR(uint32_t reg) const { + DCHECK (cur_quick_frame_ != NULL) << "This is a quick frame routine"; + return context_->GetGPR(reg); +} + +void StackVisitor::SetGPR(uint32_t reg, uintptr_t value) { + DCHECK (cur_quick_frame_ != NULL) << "This is a quick frame routine"; + context_->SetGPR(reg, value); +} + +uintptr_t StackVisitor::GetReturnPc() const { + mirror::AbstractMethod** sp = GetCurrentQuickFrame(); + DCHECK(sp != NULL); + byte* pc_addr = reinterpret_cast<byte*>(sp) + GetMethod()->GetReturnPcOffsetInBytes(); + return *reinterpret_cast<uintptr_t*>(pc_addr); +} + +void StackVisitor::SetReturnPc(uintptr_t new_ret_pc) { + mirror::AbstractMethod** sp = GetCurrentQuickFrame(); + CHECK(sp != NULL); + byte* pc_addr = reinterpret_cast<byte*>(sp) + GetMethod()->GetReturnPcOffsetInBytes(); + *reinterpret_cast<uintptr_t*>(pc_addr) = new_ret_pc; +} + +size_t StackVisitor::ComputeNumFrames(Thread* thread) { + struct NumFramesVisitor : public StackVisitor { + explicit NumFramesVisitor(Thread* thread) + : StackVisitor(thread, NULL), frames(0) {} + + virtual bool VisitFrame() { + frames++; + return true; + } + + size_t frames; + }; + NumFramesVisitor visitor(thread); + visitor.WalkStack(true); + return visitor.frames; +} + +void StackVisitor::DescribeStack(Thread* thread) { + struct DescribeStackVisitor : public StackVisitor { + explicit DescribeStackVisitor(Thread* thread) + : StackVisitor(thread, NULL) {} + + virtual bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { + LOG(INFO) << "Frame Id=" << GetFrameId() << " " << DescribeLocation(); + return true; + } + }; + DescribeStackVisitor visitor(thread); + visitor.WalkStack(true); +} + +std::string StackVisitor::DescribeLocation() const { + std::string result("Visiting method '"); + mirror::AbstractMethod* m = GetMethod(); + if (m == NULL) { + return "upcall"; + } + result += PrettyMethod(m); + result += StringPrintf("' at dex PC 0x%04zx", GetDexPc()); + if (!IsShadowFrame()) { + result += StringPrintf(" (native PC %p)", reinterpret_cast<void*>(GetCurrentQuickFramePc())); + } + return result; +} + +instrumentation::InstrumentationStackFrame StackVisitor::GetInstrumentationStackFrame(uint32_t depth) const { + return thread_->GetInstrumentationStack()->at(depth); +} + +void StackVisitor::SanityCheckFrame() const { +#ifndef NDEBUG + mirror::AbstractMethod* method = GetMethod(); + CHECK(method->GetClass() == mirror::AbstractMethod::GetMethodClass() || + method->GetClass() == mirror::AbstractMethod::GetConstructorClass()); + if (cur_quick_frame_ != NULL) { + method->AssertPcIsWithinCode(cur_quick_frame_pc_); + // Frame sanity. + size_t frame_size = method->GetFrameSizeInBytes(); + CHECK_NE(frame_size, 0u); + CHECK_LT(frame_size, 1024u); + size_t return_pc_offset = method->GetReturnPcOffsetInBytes(); + CHECK_LT(return_pc_offset, frame_size); + } +#endif +} + +void StackVisitor::WalkStack(bool include_transitions) { + DCHECK(thread_ == Thread::Current() || thread_->IsSuspended()); + CHECK_EQ(cur_depth_, 0U); + bool exit_stubs_installed = Runtime::Current()->GetInstrumentation()->AreExitStubsInstalled(); + uint32_t instrumentation_stack_depth = 0; + for (const ManagedStack* current_fragment = thread_->GetManagedStack(); current_fragment != NULL; + current_fragment = current_fragment->GetLink()) { + cur_shadow_frame_ = current_fragment->GetTopShadowFrame(); + cur_quick_frame_ = current_fragment->GetTopQuickFrame(); + cur_quick_frame_pc_ = current_fragment->GetTopQuickFramePc(); + if (cur_quick_frame_ != NULL) { // Handle quick stack frames. + // Can't be both a shadow and a quick fragment. + DCHECK(current_fragment->GetTopShadowFrame() == NULL); + mirror::AbstractMethod* method = *cur_quick_frame_; + while (method != NULL) { + DCHECK(cur_quick_frame_pc_ != GetInstrumentationExitPc()); + SanityCheckFrame(); + bool should_continue = VisitFrame(); + if (UNLIKELY(!should_continue)) { + return; + } + if (context_ != NULL) { + context_->FillCalleeSaves(*this); + } + size_t frame_size = method->GetFrameSizeInBytes(); + // Compute PC for next stack frame from return PC. + size_t return_pc_offset = method->GetReturnPcOffsetInBytes(); + byte* return_pc_addr = reinterpret_cast<byte*>(cur_quick_frame_) + return_pc_offset; + uintptr_t return_pc = *reinterpret_cast<uintptr_t*>(return_pc_addr); + if (UNLIKELY(exit_stubs_installed)) { + // While profiling, the return pc is restored from the side stack, except when walking + // the stack for an exception where the side stack will be unwound in VisitFrame. + if (GetInstrumentationExitPc() == return_pc) { + instrumentation::InstrumentationStackFrame instrumentation_frame = + GetInstrumentationStackFrame(instrumentation_stack_depth); + instrumentation_stack_depth++; + if (instrumentation_frame.interpreter_entry_) { + mirror::AbstractMethod* callee = Runtime::Current()->GetCalleeSaveMethod(Runtime::kRefsAndArgs); + if (GetMethod() != callee) { + LOG(FATAL) << "Expected: " << callee << " Found: " << PrettyMethod(GetMethod()); + } + } else if (instrumentation_frame.method_ != GetMethod()) { + LOG(FATAL) << "Expected: " << PrettyMethod(instrumentation_frame.method_) + << " Found: " << PrettyMethod(GetMethod()); + } + if (num_frames_ != 0) { + // Check agreement of frame Ids only if num_frames_ is computed to avoid infinite + // recursion. + CHECK(instrumentation_frame.frame_id_ == GetFrameId()) + << "Expected: " << instrumentation_frame.frame_id_ + << " Found: " << GetFrameId(); + } + return_pc = instrumentation_frame.return_pc_; + } + } + cur_quick_frame_pc_ = return_pc; + byte* next_frame = reinterpret_cast<byte*>(cur_quick_frame_) + frame_size; + cur_quick_frame_ = reinterpret_cast<mirror::AbstractMethod**>(next_frame); + cur_depth_++; + method = *cur_quick_frame_; + } + } else if (cur_shadow_frame_ != NULL) { + do { + SanityCheckFrame(); + bool should_continue = VisitFrame(); + if (UNLIKELY(!should_continue)) { + return; + } + cur_depth_++; + cur_shadow_frame_ = cur_shadow_frame_->GetLink(); + } while(cur_shadow_frame_ != NULL); + } + if (include_transitions) { + bool should_continue = VisitFrame(); + if (!should_continue) { + return; + } + } + cur_depth_++; + } + if (num_frames_ != 0) { + CHECK_EQ(cur_depth_, num_frames_); + } +} + +} // namespace art |