/*
* 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 NULL;
} else if (m->IsNative()) {
if (cur_quick_frame_ != NULL) {
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 {
const DexFile::CodeItem* code_item = m->GetCodeItem();
if (code_item == NULL) {
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