| /* |
| * 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 "arch/context.h" |
| #include "base/hex_dump.h" |
| #include "mirror/art_method-inl.h" |
| #include "mirror/class-inl.h" |
| #include "mirror/object.h" |
| #include "mirror/object-inl.h" |
| #include "mirror/object_array-inl.h" |
| #include "quick/quick_method_frame_info.h" |
| #include "runtime.h" |
| #include "thread.h" |
| #include "thread_list.h" |
| #include "throw_location.h" |
| #include "verify_object-inl.h" |
| #include "vmap_table.h" |
| |
| namespace art { |
| |
| mirror::Object* ShadowFrame::GetThisObject() const { |
| mirror::ArtMethod* m = GetMethod(); |
| if (m->IsStatic()) { |
| return NULL; |
| } else if (m->IsNative()) { |
| return GetVRegReference(0); |
| } else { |
| const DexFile::CodeItem* code_item = 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::ArtMethod* 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(StackReference<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; |
| } |
| |
| StackVisitor::StackVisitor(Thread* thread, Context* context, size_t num_frames) |
| : thread_(thread), cur_shadow_frame_(NULL), |
| cur_quick_frame_(NULL), cur_quick_frame_pc_(0), num_frames_(num_frames), cur_depth_(0), |
| context_(context) { |
| DCHECK(thread == Thread::Current() || thread->IsSuspended()) << *thread; |
| } |
| |
| uint32_t StackVisitor::GetDexPc(bool abort_on_failure) const { |
| if (cur_shadow_frame_ != NULL) { |
| return cur_shadow_frame_->GetDexPC(); |
| } else if (cur_quick_frame_ != NULL) { |
| return GetMethod()->ToDexPc(cur_quick_frame_pc_, abort_on_failure); |
| } else { |
| return 0; |
| } |
| } |
| |
| mirror::Object* StackVisitor::GetThisObject() const { |
| mirror::ArtMethod* m = GetMethod(); |
| if (m->IsStatic()) { |
| return nullptr; |
| } else if (m->IsNative()) { |
| if (cur_quick_frame_ != nullptr) { |
| HandleScope* hs = reinterpret_cast<HandleScope*>( |
| reinterpret_cast<char*>(cur_quick_frame_) + m->GetHandleScopeOffsetInBytes()); |
| return hs->GetReference(0); |
| } else { |
| return cur_shadow_frame_->GetVRegReference(0); |
| } |
| } else if (m->IsOptimized()) { |
| // TODO: Implement, currently only used for exceptions when jdwp is enabled. |
| LOG(WARNING) << "StackVisitor::GetThisObject is unimplemented with the optimizing compiler"; |
| return nullptr; |
| } else { |
| const DexFile::CodeItem* code_item = m->GetCodeItem(); |
| if (code_item == nullptr) { |
| UNIMPLEMENTED(ERROR) << "Failed to determine this object of abstract or proxy method: " |
| << PrettyMethod(m); |
| return nullptr; |
| } 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_); |
| } |
| |
| bool StackVisitor::GetVReg(mirror::ArtMethod* m, uint16_t vreg, VRegKind kind, |
| uint32_t* val) const { |
| if (cur_quick_frame_ != nullptr) { |
| DCHECK(context_ != nullptr); // You can't reliably read registers without a context. |
| DCHECK(m == GetMethod()); |
| const void* code_pointer = m->GetQuickOatCodePointer(); |
| DCHECK(code_pointer != nullptr); |
| const VmapTable vmap_table(m->GetVmapTable(code_pointer)); |
| QuickMethodFrameInfo frame_info = m->GetQuickFrameInfo(code_pointer); |
| uint32_t vmap_offset; |
| // TODO: IsInContext stops before spotting floating point registers. |
| if (vmap_table.IsInContext(vreg, kind, &vmap_offset)) { |
| bool is_float = (kind == kFloatVReg) || (kind == kDoubleLoVReg) || (kind == kDoubleHiVReg); |
| uint32_t spill_mask = is_float ? frame_info.FpSpillMask() : frame_info.CoreSpillMask(); |
| uint32_t reg = vmap_table.ComputeRegister(spill_mask, vmap_offset, kind); |
| uintptr_t ptr_val; |
| bool success = is_float ? GetFPR(reg, &ptr_val) : GetGPR(reg, &ptr_val); |
| if (!success) { |
| return false; |
| } |
| bool target64 = Is64BitInstructionSet(kRuntimeISA); |
| if (target64) { |
| bool wide_lo = (kind == kLongLoVReg) || (kind == kDoubleLoVReg); |
| bool wide_hi = (kind == kLongHiVReg) || (kind == kDoubleHiVReg); |
| int64_t value_long = static_cast<int64_t>(ptr_val); |
| if (wide_lo) { |
| ptr_val = static_cast<uintptr_t>(value_long & 0xFFFFFFFF); |
| } else if (wide_hi) { |
| ptr_val = static_cast<uintptr_t>(value_long >> 32); |
| } |
| } |
| *val = ptr_val; |
| return true; |
| } else { |
| const DexFile::CodeItem* code_item = m->GetCodeItem(); |
| DCHECK(code_item != nullptr) << PrettyMethod(m); // Can't be NULL or how would we compile |
| // its instructions? |
| *val = *GetVRegAddr(cur_quick_frame_, code_item, frame_info.CoreSpillMask(), |
| frame_info.FpSpillMask(), frame_info.FrameSizeInBytes(), vreg); |
| return true; |
| } |
| } else { |
| *val = cur_shadow_frame_->GetVReg(vreg); |
| return true; |
| } |
| } |
| |
| bool StackVisitor::GetVRegPair(mirror::ArtMethod* m, uint16_t vreg, VRegKind kind_lo, |
| VRegKind kind_hi, uint64_t* val) const { |
| if (kind_lo == kLongLoVReg) { |
| DCHECK_EQ(kind_hi, kLongHiVReg); |
| } else if (kind_lo == kDoubleLoVReg) { |
| DCHECK_EQ(kind_hi, kDoubleHiVReg); |
| } else { |
| LOG(FATAL) << "Expected long or double: kind_lo=" << kind_lo << ", kind_hi=" << kind_hi; |
| } |
| if (cur_quick_frame_ != nullptr) { |
| DCHECK(context_ != nullptr); // You can't reliably read registers without a context. |
| DCHECK(m == GetMethod()); |
| const void* code_pointer = m->GetQuickOatCodePointer(); |
| DCHECK(code_pointer != nullptr); |
| const VmapTable vmap_table(m->GetVmapTable(code_pointer)); |
| QuickMethodFrameInfo frame_info = m->GetQuickFrameInfo(code_pointer); |
| uint32_t vmap_offset_lo, vmap_offset_hi; |
| // TODO: IsInContext stops before spotting floating point registers. |
| if (vmap_table.IsInContext(vreg, kind_lo, &vmap_offset_lo) && |
| vmap_table.IsInContext(vreg + 1, kind_hi, &vmap_offset_hi)) { |
| bool is_float = (kind_lo == kDoubleLoVReg); |
| uint32_t spill_mask = is_float ? frame_info.FpSpillMask() : frame_info.CoreSpillMask(); |
| uint32_t reg_lo = vmap_table.ComputeRegister(spill_mask, vmap_offset_lo, kind_lo); |
| uint32_t reg_hi = vmap_table.ComputeRegister(spill_mask, vmap_offset_hi, kind_hi); |
| uintptr_t ptr_val_lo, ptr_val_hi; |
| bool success = is_float ? GetFPR(reg_lo, &ptr_val_lo) : GetGPR(reg_lo, &ptr_val_lo); |
| success &= is_float ? GetFPR(reg_hi, &ptr_val_hi) : GetGPR(reg_hi, &ptr_val_hi); |
| if (!success) { |
| return false; |
| } |
| bool target64 = Is64BitInstructionSet(kRuntimeISA); |
| if (target64) { |
| int64_t value_long_lo = static_cast<int64_t>(ptr_val_lo); |
| int64_t value_long_hi = static_cast<int64_t>(ptr_val_hi); |
| ptr_val_lo = static_cast<uintptr_t>(value_long_lo & 0xFFFFFFFF); |
| ptr_val_hi = static_cast<uintptr_t>(value_long_hi >> 32); |
| } |
| *val = (static_cast<uint64_t>(ptr_val_hi) << 32) | static_cast<uint32_t>(ptr_val_lo); |
| return true; |
| } else { |
| const DexFile::CodeItem* code_item = m->GetCodeItem(); |
| DCHECK(code_item != nullptr) << PrettyMethod(m); // Can't be NULL or how would we compile |
| // its instructions? |
| uint32_t* addr = GetVRegAddr(cur_quick_frame_, code_item, frame_info.CoreSpillMask(), |
| frame_info.FpSpillMask(), frame_info.FrameSizeInBytes(), vreg); |
| *val = *reinterpret_cast<uint64_t*>(addr); |
| return true; |
| } |
| } else { |
| *val = cur_shadow_frame_->GetVRegLong(vreg); |
| return true; |
| } |
| } |
| |
| bool StackVisitor::SetVReg(mirror::ArtMethod* m, uint16_t vreg, uint32_t new_value, |
| VRegKind kind) { |
| if (cur_quick_frame_ != nullptr) { |
| DCHECK(context_ != nullptr); // You can't reliably write registers without a context. |
| DCHECK(m == GetMethod()); |
| const void* code_pointer = m->GetQuickOatCodePointer(); |
| DCHECK(code_pointer != nullptr); |
| const VmapTable vmap_table(m->GetVmapTable(code_pointer)); |
| QuickMethodFrameInfo frame_info = m->GetQuickFrameInfo(code_pointer); |
| uint32_t vmap_offset; |
| // TODO: IsInContext stops before spotting floating point registers. |
| if (vmap_table.IsInContext(vreg, kind, &vmap_offset)) { |
| bool is_float = (kind == kFloatVReg) || (kind == kDoubleLoVReg) || (kind == kDoubleHiVReg); |
| uint32_t spill_mask = is_float ? frame_info.FpSpillMask() : frame_info.CoreSpillMask(); |
| const uint32_t reg = vmap_table.ComputeRegister(spill_mask, vmap_offset, kind); |
| bool target64 = Is64BitInstructionSet(kRuntimeISA); |
| // Deal with 32 or 64-bit wide registers in a way that builds on all targets. |
| if (target64) { |
| bool wide_lo = (kind == kLongLoVReg) || (kind == kDoubleLoVReg); |
| bool wide_hi = (kind == kLongHiVReg) || (kind == kDoubleHiVReg); |
| if (wide_lo || wide_hi) { |
| uintptr_t old_reg_val; |
| bool success = is_float ? GetFPR(reg, &old_reg_val) : GetGPR(reg, &old_reg_val); |
| if (!success) { |
| return false; |
| } |
| uint64_t new_vreg_portion = static_cast<uint64_t>(new_value); |
| uint64_t old_reg_val_as_wide = static_cast<uint64_t>(old_reg_val); |
| uint64_t mask = 0xffffffff; |
| if (wide_lo) { |
| mask = mask << 32; |
| } else { |
| new_vreg_portion = new_vreg_portion << 32; |
| } |
| new_value = static_cast<uintptr_t>((old_reg_val_as_wide & mask) | new_vreg_portion); |
| } |
| } |
| if (is_float) { |
| return SetFPR(reg, new_value); |
| } else { |
| return SetGPR(reg, new_value); |
| } |
| } else { |
| const DexFile::CodeItem* code_item = m->GetCodeItem(); |
| DCHECK(code_item != nullptr) << PrettyMethod(m); // Can't be NULL or how would we compile |
| // its instructions? |
| uint32_t* addr = GetVRegAddr(cur_quick_frame_, code_item, frame_info.CoreSpillMask(), |
| frame_info.FpSpillMask(), frame_info.FrameSizeInBytes(), vreg); |
| *addr = new_value; |
| return true; |
| } |
| } else { |
| cur_shadow_frame_->SetVReg(vreg, new_value); |
| return true; |
| } |
| } |
| |
| bool StackVisitor::SetVRegPair(mirror::ArtMethod* m, uint16_t vreg, uint64_t new_value, |
| VRegKind kind_lo, VRegKind kind_hi) { |
| if (kind_lo == kLongLoVReg) { |
| DCHECK_EQ(kind_hi, kLongHiVReg); |
| } else if (kind_lo == kDoubleLoVReg) { |
| DCHECK_EQ(kind_hi, kDoubleHiVReg); |
| } else { |
| LOG(FATAL) << "Expected long or double: kind_lo=" << kind_lo << ", kind_hi=" << kind_hi; |
| } |
| if (cur_quick_frame_ != nullptr) { |
| DCHECK(context_ != nullptr); // You can't reliably write registers without a context. |
| DCHECK(m == GetMethod()); |
| const void* code_pointer = m->GetQuickOatCodePointer(); |
| DCHECK(code_pointer != nullptr); |
| const VmapTable vmap_table(m->GetVmapTable(code_pointer)); |
| QuickMethodFrameInfo frame_info = m->GetQuickFrameInfo(code_pointer); |
| uint32_t vmap_offset_lo, vmap_offset_hi; |
| // TODO: IsInContext stops before spotting floating point registers. |
| if (vmap_table.IsInContext(vreg, kind_lo, &vmap_offset_lo) && |
| vmap_table.IsInContext(vreg + 1, kind_hi, &vmap_offset_hi)) { |
| bool is_float = (kind_lo == kDoubleLoVReg); |
| uint32_t spill_mask = is_float ? frame_info.FpSpillMask() : frame_info.CoreSpillMask(); |
| uint32_t reg_lo = vmap_table.ComputeRegister(spill_mask, vmap_offset_lo, kind_lo); |
| uint32_t reg_hi = vmap_table.ComputeRegister(spill_mask, vmap_offset_hi, kind_hi); |
| uintptr_t new_value_lo = static_cast<uintptr_t>(new_value & 0xFFFFFFFF); |
| uintptr_t new_value_hi = static_cast<uintptr_t>(new_value >> 32); |
| bool target64 = Is64BitInstructionSet(kRuntimeISA); |
| // Deal with 32 or 64-bit wide registers in a way that builds on all targets. |
| if (target64) { |
| uintptr_t old_reg_val_lo, old_reg_val_hi; |
| bool success = is_float ? GetFPR(reg_lo, &old_reg_val_lo) : GetGPR(reg_lo, &old_reg_val_lo); |
| success &= is_float ? GetFPR(reg_hi, &old_reg_val_hi) : GetGPR(reg_hi, &old_reg_val_hi); |
| if (!success) { |
| return false; |
| } |
| uint64_t new_vreg_portion_lo = static_cast<uint64_t>(new_value_lo); |
| uint64_t new_vreg_portion_hi = static_cast<uint64_t>(new_value_hi) << 32; |
| uint64_t old_reg_val_lo_as_wide = static_cast<uint64_t>(old_reg_val_lo); |
| uint64_t old_reg_val_hi_as_wide = static_cast<uint64_t>(old_reg_val_hi); |
| uint64_t mask_lo = static_cast<uint64_t>(0xffffffff) << 32; |
| uint64_t mask_hi = 0xffffffff; |
| new_value_lo = static_cast<uintptr_t>((old_reg_val_lo_as_wide & mask_lo) | new_vreg_portion_lo); |
| new_value_hi = static_cast<uintptr_t>((old_reg_val_hi_as_wide & mask_hi) | new_vreg_portion_hi); |
| } |
| bool success = is_float ? SetFPR(reg_lo, new_value_lo) : SetGPR(reg_lo, new_value_lo); |
| success &= is_float ? SetFPR(reg_hi, new_value_hi) : SetGPR(reg_hi, new_value_hi); |
| return success; |
| } else { |
| const DexFile::CodeItem* code_item = m->GetCodeItem(); |
| DCHECK(code_item != nullptr) << PrettyMethod(m); // Can't be NULL or how would we compile |
| // its instructions? |
| uint32_t* addr = GetVRegAddr(cur_quick_frame_, code_item, frame_info.CoreSpillMask(), |
| frame_info.FpSpillMask(), frame_info.FrameSizeInBytes(), vreg); |
| *reinterpret_cast<uint64_t*>(addr) = new_value; |
| return true; |
| } |
| } else { |
| cur_shadow_frame_->SetVRegLong(vreg, new_value); |
| return true; |
| } |
| } |
| |
| uintptr_t* StackVisitor::GetGPRAddress(uint32_t reg) const { |
| DCHECK(cur_quick_frame_ != NULL) << "This is a quick frame routine"; |
| return context_->GetGPRAddress(reg); |
| } |
| |
| bool StackVisitor::GetGPR(uint32_t reg, uintptr_t* val) const { |
| DCHECK(cur_quick_frame_ != NULL) << "This is a quick frame routine"; |
| return context_->GetGPR(reg, val); |
| } |
| |
| bool StackVisitor::SetGPR(uint32_t reg, uintptr_t value) { |
| DCHECK(cur_quick_frame_ != NULL) << "This is a quick frame routine"; |
| return context_->SetGPR(reg, value); |
| } |
| |
| bool StackVisitor::GetFPR(uint32_t reg, uintptr_t* val) const { |
| DCHECK(cur_quick_frame_ != NULL) << "This is a quick frame routine"; |
| return context_->GetFPR(reg, val); |
| } |
| |
| bool StackVisitor::SetFPR(uint32_t reg, uintptr_t value) { |
| DCHECK(cur_quick_frame_ != NULL) << "This is a quick frame routine"; |
| return context_->SetFPR(reg, value); |
| } |
| |
| uintptr_t StackVisitor::GetReturnPc() const { |
| byte* sp = reinterpret_cast<byte*>(GetCurrentQuickFrame()); |
| DCHECK(sp != NULL); |
| byte* pc_addr = sp + GetMethod()->GetReturnPcOffsetInBytes(); |
| return *reinterpret_cast<uintptr_t*>(pc_addr); |
| } |
| |
| void StackVisitor::SetReturnPc(uintptr_t new_ret_pc) { |
| byte* sp = reinterpret_cast<byte*>(GetCurrentQuickFrame()); |
| CHECK(sp != NULL); |
| byte* pc_addr = 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) {} |
| |
| bool VisitFrame() OVERRIDE { |
| frames++; |
| return true; |
| } |
| |
| size_t frames; |
| }; |
| NumFramesVisitor visitor(thread); |
| visitor.WalkStack(true); |
| return visitor.frames; |
| } |
| |
| bool StackVisitor::GetNextMethodAndDexPc(mirror::ArtMethod** next_method, uint32_t* next_dex_pc) { |
| struct HasMoreFramesVisitor : public StackVisitor { |
| explicit HasMoreFramesVisitor(Thread* thread, size_t num_frames, size_t frame_height) |
| : StackVisitor(thread, nullptr, num_frames), frame_height_(frame_height), |
| found_frame_(false), has_more_frames_(false), next_method_(nullptr), next_dex_pc_(0) { |
| } |
| |
| bool VisitFrame() OVERRIDE SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { |
| if (found_frame_) { |
| mirror::ArtMethod* method = GetMethod(); |
| if (method != nullptr && !method->IsRuntimeMethod()) { |
| has_more_frames_ = true; |
| next_method_ = method; |
| next_dex_pc_ = GetDexPc(); |
| return false; // End stack walk once next method is found. |
| } |
| } else if (GetFrameHeight() == frame_height_) { |
| found_frame_ = true; |
| } |
| return true; |
| } |
| |
| size_t frame_height_; |
| bool found_frame_; |
| bool has_more_frames_; |
| mirror::ArtMethod* next_method_; |
| uint32_t next_dex_pc_; |
| }; |
| HasMoreFramesVisitor visitor(thread_, GetNumFrames(), GetFrameHeight()); |
| visitor.WalkStack(true); |
| *next_method = visitor.next_method_; |
| *next_dex_pc = visitor.next_dex_pc_; |
| return visitor.has_more_frames_; |
| } |
| |
| void StackVisitor::DescribeStack(Thread* thread) { |
| struct DescribeStackVisitor : public StackVisitor { |
| explicit DescribeStackVisitor(Thread* thread) |
| : StackVisitor(thread, NULL) {} |
| |
| bool VisitFrame() OVERRIDE 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::ArtMethod* m = GetMethod(); |
| if (m == NULL) { |
| return "upcall"; |
| } |
| result += PrettyMethod(m); |
| result += StringPrintf("' at dex PC 0x%04x", GetDexPc()); |
| if (!IsShadowFrame()) { |
| result += StringPrintf(" (native PC %p)", reinterpret_cast<void*>(GetCurrentQuickFramePc())); |
| } |
| return result; |
| } |
| |
| static instrumentation::InstrumentationStackFrame& GetInstrumentationStackFrame(Thread* thread, |
| uint32_t depth) { |
| CHECK_LT(depth, thread->GetInstrumentationStack()->size()); |
| return thread->GetInstrumentationStack()->at(depth); |
| } |
| |
| void StackVisitor::SanityCheckFrame() const { |
| if (kIsDebugBuild) { |
| mirror::ArtMethod* method = GetMethod(); |
| CHECK_EQ(method->GetClass(), mirror::ArtMethod::GetJavaLangReflectArtMethod()); |
| if (cur_quick_frame_ != nullptr) { |
| method->AssertPcIsWithinQuickCode(cur_quick_frame_pc_); |
| // Frame sanity. |
| size_t frame_size = method->GetFrameSizeInBytes(); |
| CHECK_NE(frame_size, 0u); |
| // A rough guess at an upper size we expect to see for a frame. |
| // 256 registers |
| // 2 words HandleScope overhead |
| // 3+3 register spills |
| // TODO: this seems architecture specific for the case of JNI frames. |
| // TODO: 083-compiler-regressions ManyFloatArgs shows this estimate is wrong. |
| // const size_t kMaxExpectedFrameSize = (256 + 2 + 3 + 3) * sizeof(word); |
| const size_t kMaxExpectedFrameSize = 2 * KB; |
| CHECK_LE(frame_size, kMaxExpectedFrameSize); |
| size_t return_pc_offset = method->GetReturnPcOffsetInBytes(); |
| CHECK_LT(return_pc_offset, frame_size); |
| } |
| } |
| } |
| |
| 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::ArtMethod* method = cur_quick_frame_->AsMirrorPtr(); |
| while (method != NULL) { |
| 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(frame_size); |
| 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 (GetQuickInstrumentationExitPc() == return_pc) { |
| const instrumentation::InstrumentationStackFrame& instrumentation_frame = |
| GetInstrumentationStackFrame(thread_, instrumentation_stack_depth); |
| instrumentation_stack_depth++; |
| if (GetMethod() == Runtime::Current()->GetCalleeSaveMethod(Runtime::kSaveAll)) { |
| // Skip runtime save all callee frames which are used to deliver exceptions. |
| } else if (instrumentation_frame.interpreter_entry_) { |
| mirror::ArtMethod* callee = Runtime::Current()->GetCalleeSaveMethod(Runtime::kRefsAndArgs); |
| CHECK_EQ(GetMethod(), callee) << "Expected: " << PrettyMethod(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<StackReference<mirror::ArtMethod>*>(next_frame); |
| cur_depth_++; |
| method = cur_quick_frame_->AsMirrorPtr(); |
| } |
| } 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 |