John McCutchan
a1798f7e45
- Use native stack walker for allocation profiling when --profile-vm is passed - Helpers for retrieving SP, FP, and PC registers - Refactor sampler code to share more code between allocation sampling / interrupt sampling - Export all symbols into the dynamic symbol table for run_vm_tests (already doing this for Dart executable) R=regis@google.com Review URL: https://codereview.chromium.org//1274663004 .
1332 lines
37 KiB
C++
1332 lines
37 KiB
C++
// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#include "platform/address_sanitizer.h"
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#include "platform/memory_sanitizer.h"
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#include "platform/utils.h"
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#include "vm/allocation.h"
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#include "vm/atomic.h"
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#include "vm/code_patcher.h"
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#include "vm/instructions.h"
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#include "vm/isolate.h"
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#include "vm/json_stream.h"
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#include "vm/lockers.h"
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#include "vm/native_symbol.h"
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#include "vm/object.h"
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#include "vm/os.h"
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#include "vm/profiler.h"
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#include "vm/reusable_handles.h"
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#include "vm/signal_handler.h"
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#include "vm/simulator.h"
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#include "vm/stack_frame.h"
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namespace dart {
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DECLARE_FLAG(bool, trace_profiler);
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DEFINE_FLAG(bool, profile, true, "Enable Sampling Profiler");
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DEFINE_FLAG(bool, trace_profiled_isolates, false, "Trace profiled isolates.");
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#if defined(TARGET_OS_ANDROID) || defined(TARGET_ARCH_ARM64) || \
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defined(TARGET_ARCH_ARM) || defined(TARGET_ARCH_MIPS)
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DEFINE_FLAG(int, profile_period, 10000,
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"Time between profiler samples in microseconds. Minimum 50.");
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#else
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DEFINE_FLAG(int, profile_period, 1000,
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"Time between profiler samples in microseconds. Minimum 50.");
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#endif
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DEFINE_FLAG(int, profile_depth, 8,
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"Maximum number stack frames walked. Minimum 1. Maximum 255.");
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#if defined(USING_SIMULATOR)
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DEFINE_FLAG(bool, profile_vm, true,
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"Always collect native stack traces.");
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#else
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DEFINE_FLAG(bool, profile_vm, false,
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"Always collect native stack traces.");
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#endif
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bool Profiler::initialized_ = false;
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SampleBuffer* Profiler::sample_buffer_ = NULL;
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static intptr_t NumberOfFramesToCollect() {
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if (FLAG_profile_depth <= 0) {
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return 0;
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}
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// Subtract to reserve space for the possible missing frame.
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return FLAG_profile_depth - 1;
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}
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void Profiler::InitOnce() {
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// Place some sane restrictions on user controlled flags.
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SetSamplePeriod(FLAG_profile_period);
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SetSampleDepth(FLAG_profile_depth);
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Sample::InitOnce();
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if (!FLAG_profile) {
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return;
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}
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ASSERT(!initialized_);
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sample_buffer_ = new SampleBuffer();
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NativeSymbolResolver::InitOnce();
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ThreadInterrupter::SetInterruptPeriod(FLAG_profile_period);
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ThreadInterrupter::Startup();
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initialized_ = true;
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}
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void Profiler::Shutdown() {
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if (!FLAG_profile) {
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return;
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}
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ASSERT(initialized_);
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ThreadInterrupter::Shutdown();
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NativeSymbolResolver::ShutdownOnce();
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}
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void Profiler::SetSampleDepth(intptr_t depth) {
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const int kMinimumDepth = 2;
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const int kMaximumDepth = 255;
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if (depth < kMinimumDepth) {
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FLAG_profile_depth = kMinimumDepth;
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} else if (depth > kMaximumDepth) {
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FLAG_profile_depth = kMaximumDepth;
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} else {
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FLAG_profile_depth = depth;
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}
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}
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void Profiler::SetSamplePeriod(intptr_t period) {
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const int kMinimumProfilePeriod = 50;
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if (period < kMinimumProfilePeriod) {
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FLAG_profile_period = kMinimumProfilePeriod;
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} else {
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FLAG_profile_period = period;
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}
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}
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void Profiler::InitProfilingForIsolate(Isolate* isolate, bool shared_buffer) {
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if (!FLAG_profile) {
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return;
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}
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ASSERT(isolate == Isolate::Current());
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ASSERT(isolate != NULL);
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ASSERT(sample_buffer_ != NULL);
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{
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MutexLocker profiler_data_lock(isolate->profiler_data_mutex());
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SampleBuffer* sample_buffer = sample_buffer_;
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if (!shared_buffer) {
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sample_buffer = new SampleBuffer();
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}
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IsolateProfilerData* profiler_data =
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new IsolateProfilerData(sample_buffer, !shared_buffer);
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ASSERT(profiler_data != NULL);
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isolate->set_profiler_data(profiler_data);
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if (FLAG_trace_profiled_isolates) {
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OS::Print("Profiler Setup %p %s\n", isolate, isolate->name());
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}
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}
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BeginExecution(isolate);
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}
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void Profiler::ShutdownProfilingForIsolate(Isolate* isolate) {
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ASSERT(isolate != NULL);
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if (!FLAG_profile) {
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return;
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}
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// We do not have a current isolate.
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ASSERT(Isolate::Current() == NULL);
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{
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MutexLocker profiler_data_lock(isolate->profiler_data_mutex());
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IsolateProfilerData* profiler_data = isolate->profiler_data();
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if (profiler_data == NULL) {
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// Already freed.
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return;
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}
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isolate->set_profiler_data(NULL);
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delete profiler_data;
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if (FLAG_trace_profiled_isolates) {
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OS::Print("Profiler Shutdown %p %s\n", isolate, isolate->name());
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}
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}
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}
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void Profiler::BeginExecution(Isolate* isolate) {
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if (isolate == NULL) {
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return;
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}
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if (!FLAG_profile) {
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return;
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}
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ASSERT(initialized_);
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IsolateProfilerData* profiler_data = isolate->profiler_data();
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if (profiler_data == NULL) {
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return;
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}
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ThreadInterrupter::Register(RecordSampleInterruptCallback, isolate);
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ThreadInterrupter::WakeUp();
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}
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void Profiler::EndExecution(Isolate* isolate) {
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if (isolate == NULL) {
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return;
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}
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if (!FLAG_profile) {
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return;
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}
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ASSERT(initialized_);
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ThreadInterrupter::Unregister();
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}
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IsolateProfilerData::IsolateProfilerData(SampleBuffer* sample_buffer,
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bool own_sample_buffer) {
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ASSERT(sample_buffer != NULL);
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sample_buffer_ = sample_buffer;
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own_sample_buffer_ = own_sample_buffer;
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block_count_ = 0;
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}
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IsolateProfilerData::~IsolateProfilerData() {
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if (own_sample_buffer_) {
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delete sample_buffer_;
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sample_buffer_ = NULL;
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own_sample_buffer_ = false;
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}
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}
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void IsolateProfilerData::Block() {
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block_count_++;
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}
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void IsolateProfilerData::Unblock() {
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block_count_--;
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if (block_count_ < 0) {
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FATAL("Too many calls to Dart_IsolateUnblocked.");
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}
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if (!blocked()) {
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// We just unblocked this isolate, wake up the thread interrupter.
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ThreadInterrupter::WakeUp();
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}
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}
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intptr_t Sample::pcs_length_ = 0;
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intptr_t Sample::instance_size_ = 0;
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void Sample::InitOnce() {
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ASSERT(FLAG_profile_depth >= 2);
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pcs_length_ = FLAG_profile_depth;
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instance_size_ =
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sizeof(Sample) + (sizeof(uword) * pcs_length_); // NOLINT.
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}
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uword* Sample::GetPCArray() const {
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return reinterpret_cast<uword*>(
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reinterpret_cast<uintptr_t>(this) + sizeof(*this));
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}
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SampleBuffer::SampleBuffer(intptr_t capacity) {
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ASSERT(Sample::instance_size() > 0);
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samples_ = reinterpret_cast<Sample*>(
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calloc(capacity, Sample::instance_size()));
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if (FLAG_trace_profiler) {
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OS::Print("Profiler holds %" Pd " samples\n", capacity);
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OS::Print("Profiler sample is %" Pd " bytes\n", Sample::instance_size());
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OS::Print("Profiler memory usage = %" Pd " bytes\n",
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capacity * Sample::instance_size());
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}
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capacity_ = capacity;
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cursor_ = 0;
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}
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Sample* SampleBuffer::At(intptr_t idx) const {
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ASSERT(idx >= 0);
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ASSERT(idx < capacity_);
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intptr_t offset = idx * Sample::instance_size();
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uint8_t* samples = reinterpret_cast<uint8_t*>(samples_);
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return reinterpret_cast<Sample*>(samples + offset);
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}
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Sample* SampleBuffer::ReserveSample() {
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ASSERT(samples_ != NULL);
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uintptr_t cursor = AtomicOperations::FetchAndIncrement(&cursor_);
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// Map back into sample buffer range.
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cursor = cursor % capacity_;
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return At(cursor);
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}
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// Attempts to find the true return address when a Dart frame is being setup
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// or torn down.
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// NOTE: Architecture specific implementations below.
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class ReturnAddressLocator : public ValueObject {
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public:
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ReturnAddressLocator(Sample* sample, const Code& code)
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: stack_buffer_(sample->GetStackBuffer()),
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pc_(sample->pc()),
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code_(Code::ZoneHandle(code.raw())) {
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ASSERT(!code_.IsNull());
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ASSERT(code_.ContainsInstructionAt(pc()));
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}
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ReturnAddressLocator(uword pc, uword* stack_buffer, const Code& code)
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: stack_buffer_(stack_buffer),
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pc_(pc),
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code_(Code::ZoneHandle(code.raw())) {
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ASSERT(!code_.IsNull());
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ASSERT(code_.ContainsInstructionAt(pc_));
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}
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uword pc() {
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return pc_;
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}
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// Returns false on failure.
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bool LocateReturnAddress(uword* return_address);
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// Returns offset into code object.
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intptr_t RelativePC() {
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ASSERT(pc() >= code_.EntryPoint());
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return static_cast<intptr_t>(pc() - code_.EntryPoint());
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}
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uint8_t* CodePointer(intptr_t offset) {
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const intptr_t size = code_.Size();
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ASSERT(offset < size);
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uint8_t* code_pointer = reinterpret_cast<uint8_t*>(code_.EntryPoint());
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code_pointer += offset;
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return code_pointer;
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}
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uword StackAt(intptr_t i) {
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ASSERT(i >= 0);
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ASSERT(i < Sample::kStackBufferSizeInWords);
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return stack_buffer_[i];
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}
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private:
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uword* stack_buffer_;
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uword pc_;
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const Code& code_;
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};
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#if defined(TARGET_ARCH_IA32) || defined(TARGET_ARCH_X64)
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bool ReturnAddressLocator::LocateReturnAddress(uword* return_address) {
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ASSERT(return_address != NULL);
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const intptr_t offset = RelativePC();
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ASSERT(offset >= 0);
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const intptr_t size = code_.Size();
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ASSERT(offset < size);
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const intptr_t prologue_offset = code_.GetPrologueOffset();
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if (offset < prologue_offset) {
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// Before the prologue, return address is at the top of the stack.
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// TODO(johnmccutchan): Some intrinsics and stubs do not conform to the
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// expected stack layout. Use a more robust solution for those code objects.
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*return_address = StackAt(0);
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return true;
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}
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// Detect if we are:
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// push ebp <--- here
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// mov ebp, esp
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// on X64 the register names are different but the sequence is the same.
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ProloguePattern pp(pc());
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if (pp.IsValid()) {
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// Stack layout:
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// 0 RETURN ADDRESS.
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*return_address = StackAt(0);
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return true;
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}
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// Detect if we are:
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// push ebp
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// mov ebp, esp <--- here
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// on X64 the register names are different but the sequence is the same.
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SetFramePointerPattern sfpp(pc());
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if (sfpp.IsValid()) {
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// Stack layout:
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// 0 CALLER FRAME POINTER
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// 1 RETURN ADDRESS
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*return_address = StackAt(1);
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return true;
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}
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// Detect if we are:
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// ret <--- here
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ReturnPattern rp(pc());
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if (rp.IsValid()) {
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// Stack layout:
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// 0 RETURN ADDRESS.
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*return_address = StackAt(0);
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return true;
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}
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return false;
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}
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#elif defined(TARGET_ARCH_ARM)
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bool ReturnAddressLocator::LocateReturnAddress(uword* return_address) {
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ASSERT(return_address != NULL);
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return false;
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}
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#elif defined(TARGET_ARCH_ARM64)
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bool ReturnAddressLocator::LocateReturnAddress(uword* return_address) {
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ASSERT(return_address != NULL);
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return false;
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}
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#elif defined(TARGET_ARCH_MIPS)
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bool ReturnAddressLocator::LocateReturnAddress(uword* return_address) {
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ASSERT(return_address != NULL);
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return false;
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}
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#else
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#error ReturnAddressLocator implementation missing for this architecture.
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#endif
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ClearProfileVisitor::ClearProfileVisitor(Isolate* isolate)
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: SampleVisitor(isolate) {
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}
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void ClearProfileVisitor::VisitSample(Sample* sample) {
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sample->Clear();
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}
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// Given an exit frame, walk the Dart stack.
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class ProfilerDartExitStackWalker : public ValueObject {
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public:
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ProfilerDartExitStackWalker(Isolate* isolate, Sample* sample)
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: sample_(sample),
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frame_iterator_(isolate) {
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ASSERT(sample_ != NULL);
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}
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void walk() {
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// Mark that this sample was collected from an exit frame.
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sample_->set_exit_frame_sample(true);
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intptr_t frame_index = 0;
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StackFrame* frame = frame_iterator_.NextFrame();
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while (frame != NULL) {
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sample_->SetAt(frame_index, frame->pc());
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frame_index++;
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if (frame_index >= NumberOfFramesToCollect()) {
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sample_->set_truncated_trace(true);
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break;
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}
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frame = frame_iterator_.NextFrame();
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}
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}
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private:
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Sample* sample_;
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DartFrameIterator frame_iterator_;
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};
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// Executing Dart code, walk the stack.
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class ProfilerDartStackWalker : public ValueObject {
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public:
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ProfilerDartStackWalker(Sample* sample,
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uword stack_lower,
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uword stack_upper,
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uword pc,
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uword fp,
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uword sp)
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: sample_(sample),
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stack_upper_(stack_upper),
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stack_lower_(stack_lower) {
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ASSERT(sample_ != NULL);
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pc_ = reinterpret_cast<uword*>(pc);
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fp_ = reinterpret_cast<uword*>(fp);
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sp_ = reinterpret_cast<uword*>(sp);
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}
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void walk() {
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sample_->set_exit_frame_sample(false);
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if (!ValidFramePointer()) {
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sample_->set_ignore_sample(true);
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return;
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}
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ASSERT(ValidFramePointer());
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uword return_pc = InitialReturnAddress();
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if (StubCode::InInvocationStub(return_pc)) {
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// Edge case- we have called out from the Invocation Stub but have not
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// created the stack frame of the callee. Attempt to locate the exit
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// frame before walking the stack.
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if (!NextExit() || !ValidFramePointer()) {
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// Nothing to sample.
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sample_->set_ignore_sample(true);
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return;
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}
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}
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for (int i = 0; i < NumberOfFramesToCollect(); i++) {
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sample_->SetAt(i, reinterpret_cast<uword>(pc_));
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if (!Next()) {
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return;
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}
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}
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sample_->set_truncated_trace(true);
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}
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private:
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bool Next() {
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if (!ValidFramePointer()) {
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return false;
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}
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if (StubCode::InInvocationStub(reinterpret_cast<uword>(pc_))) {
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// In invocation stub.
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return NextExit();
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}
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// In regular Dart frame.
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uword* new_pc = CallerPC();
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// Check if we've moved into the invocation stub.
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if (StubCode::InInvocationStub(reinterpret_cast<uword>(new_pc))) {
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// New PC is inside invocation stub, skip.
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return NextExit();
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}
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uword* new_fp = CallerFP();
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if (new_fp <= fp_) {
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// FP didn't move to a higher address.
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return false;
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}
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// Success, update fp and pc.
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fp_ = new_fp;
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pc_ = new_pc;
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return true;
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}
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bool NextExit() {
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if (!ValidFramePointer()) {
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return false;
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}
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uword* new_fp = ExitLink();
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if (new_fp == NULL) {
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// No exit link.
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return false;
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}
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if (new_fp <= fp_) {
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// FP didn't move to a higher address.
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return false;
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}
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if (!ValidFramePointer(new_fp)) {
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return false;
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}
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// Success, update fp and pc.
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fp_ = new_fp;
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pc_ = CallerPC();
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return true;
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}
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uword InitialReturnAddress() const {
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ASSERT(sp_ != NULL);
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// MSan/ASan are unaware of frames initialized by generated code.
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MSAN_UNPOISON(sp_, kWordSize);
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ASAN_UNPOISON(sp_, kWordSize);
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return *(sp_);
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}
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uword* CallerPC() const {
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ASSERT(fp_ != NULL);
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uword* caller_pc_ptr = fp_ + kSavedCallerPcSlotFromFp;
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// MSan/ASan are unaware of frames initialized by generated code.
|
|
MSAN_UNPOISON(caller_pc_ptr, kWordSize);
|
|
ASAN_UNPOISON(caller_pc_ptr, kWordSize);
|
|
return reinterpret_cast<uword*>(*caller_pc_ptr);
|
|
}
|
|
|
|
uword* CallerFP() const {
|
|
ASSERT(fp_ != NULL);
|
|
uword* caller_fp_ptr = fp_ + kSavedCallerFpSlotFromFp;
|
|
// MSan/ASan are unaware of frames initialized by generated code.
|
|
MSAN_UNPOISON(caller_fp_ptr, kWordSize);
|
|
ASAN_UNPOISON(caller_fp_ptr, kWordSize);
|
|
return reinterpret_cast<uword*>(*caller_fp_ptr);
|
|
}
|
|
|
|
uword* ExitLink() const {
|
|
ASSERT(fp_ != NULL);
|
|
uword* exit_link_ptr = fp_ + kExitLinkSlotFromEntryFp;
|
|
// MSan/ASan are unaware of frames initialized by generated code.
|
|
MSAN_UNPOISON(exit_link_ptr, kWordSize);
|
|
ASAN_UNPOISON(exit_link_ptr, kWordSize);
|
|
return reinterpret_cast<uword*>(*exit_link_ptr);
|
|
}
|
|
|
|
bool ValidFramePointer() const {
|
|
return ValidFramePointer(fp_);
|
|
}
|
|
|
|
bool ValidFramePointer(uword* fp) const {
|
|
if (fp == NULL) {
|
|
return false;
|
|
}
|
|
uword cursor = reinterpret_cast<uword>(fp);
|
|
cursor += sizeof(fp);
|
|
return (cursor >= stack_lower_) && (cursor < stack_upper_);
|
|
}
|
|
|
|
uword* pc_;
|
|
uword* fp_;
|
|
uword* sp_;
|
|
Sample* sample_;
|
|
const uword stack_upper_;
|
|
uword stack_lower_;
|
|
};
|
|
|
|
|
|
// If the VM is compiled without frame pointers (which is the default on
|
|
// recent GCC versions with optimizing enabled) the stack walking code may
|
|
// fail.
|
|
//
|
|
class ProfilerNativeStackWalker : public ValueObject {
|
|
public:
|
|
ProfilerNativeStackWalker(Sample* sample,
|
|
uword stack_lower,
|
|
uword stack_upper,
|
|
uword pc,
|
|
uword fp,
|
|
uword sp)
|
|
: sample_(sample),
|
|
stack_upper_(stack_upper),
|
|
original_pc_(pc),
|
|
original_fp_(fp),
|
|
original_sp_(sp),
|
|
lower_bound_(stack_lower) {
|
|
ASSERT(sample_ != NULL);
|
|
}
|
|
|
|
void walk() {
|
|
const uword kMaxStep = VirtualMemory::PageSize();
|
|
|
|
sample_->SetAt(0, original_pc_);
|
|
|
|
uword* pc = reinterpret_cast<uword*>(original_pc_);
|
|
uword* fp = reinterpret_cast<uword*>(original_fp_);
|
|
uword* previous_fp = fp;
|
|
|
|
uword gap = original_fp_ - original_sp_;
|
|
if (gap >= kMaxStep) {
|
|
// Gap between frame pointer and stack pointer is
|
|
// too large.
|
|
return;
|
|
}
|
|
|
|
if (!ValidFramePointer(fp)) {
|
|
return;
|
|
}
|
|
|
|
for (int i = 0; i < NumberOfFramesToCollect(); i++) {
|
|
sample_->SetAt(i, reinterpret_cast<uword>(pc));
|
|
|
|
pc = CallerPC(fp);
|
|
previous_fp = fp;
|
|
fp = CallerFP(fp);
|
|
|
|
if (fp == NULL) {
|
|
return;
|
|
}
|
|
|
|
if (fp <= previous_fp) {
|
|
// Frame pointer did not move to a higher address.
|
|
return;
|
|
}
|
|
|
|
gap = fp - previous_fp;
|
|
if (gap >= kMaxStep) {
|
|
// Frame pointer step is too large.
|
|
return;
|
|
}
|
|
|
|
if (!ValidFramePointer(fp)) {
|
|
// Frame pointer is outside of isolate stack boundary.
|
|
return;
|
|
}
|
|
|
|
// Move the lower bound up.
|
|
lower_bound_ = reinterpret_cast<uword>(fp);
|
|
}
|
|
|
|
sample_->set_truncated_trace(true);
|
|
}
|
|
|
|
private:
|
|
uword* CallerPC(uword* fp) const {
|
|
ASSERT(fp != NULL);
|
|
uword* caller_pc_ptr = fp + kSavedCallerPcSlotFromFp;
|
|
// This may actually be uninitialized, by design (see class comment above).
|
|
MSAN_UNPOISON(caller_pc_ptr, kWordSize);
|
|
ASAN_UNPOISON(caller_pc_ptr, kWordSize);
|
|
return reinterpret_cast<uword*>(*caller_pc_ptr);
|
|
}
|
|
|
|
uword* CallerFP(uword* fp) const {
|
|
ASSERT(fp != NULL);
|
|
uword* caller_fp_ptr = fp + kSavedCallerFpSlotFromFp;
|
|
// This may actually be uninitialized, by design (see class comment above).
|
|
MSAN_UNPOISON(caller_fp_ptr, kWordSize);
|
|
ASAN_UNPOISON(caller_fp_ptr, kWordSize);
|
|
return reinterpret_cast<uword*>(*caller_fp_ptr);
|
|
}
|
|
|
|
bool ValidFramePointer(uword* fp) const {
|
|
if (fp == NULL) {
|
|
return false;
|
|
}
|
|
uword cursor = reinterpret_cast<uword>(fp);
|
|
cursor += sizeof(fp);
|
|
bool r = (cursor >= lower_bound_) && (cursor < stack_upper_);
|
|
return r;
|
|
}
|
|
|
|
Sample* sample_;
|
|
const uword stack_upper_;
|
|
const uword original_pc_;
|
|
const uword original_fp_;
|
|
const uword original_sp_;
|
|
uword lower_bound_;
|
|
};
|
|
|
|
|
|
static void CopyPCMarkerIfSafe(Sample* sample, uword fp_addr, uword sp_addr) {
|
|
ASSERT(sample != NULL);
|
|
|
|
if (sample->vm_tag() != VMTag::kDartTagId) {
|
|
// We can only trust the stack pointer if we are executing Dart code.
|
|
// See http://dartbug.com/20421 for details.
|
|
return;
|
|
}
|
|
uword* fp = reinterpret_cast<uword*>(fp_addr);
|
|
uword* sp = reinterpret_cast<uword*>(sp_addr);
|
|
|
|
// If FP == SP, the pc marker hasn't been pushed.
|
|
if (fp > sp) {
|
|
uword* pc_marker_ptr = fp + kPcMarkerSlotFromFp;
|
|
// MSan/ASan are unaware of frames initialized by generated code.
|
|
MSAN_UNPOISON(pc_marker_ptr, kWordSize);
|
|
ASAN_UNPOISON(pc_marker_ptr, kWordSize);
|
|
sample->set_pc_marker(*pc_marker_ptr);
|
|
}
|
|
}
|
|
|
|
|
|
static void CopyStackBuffer(Sample* sample, uword sp_addr) {
|
|
ASSERT(sample != NULL);
|
|
if (sample->vm_tag() != VMTag::kDartTagId) {
|
|
// We can only trust the stack pointer if we are executing Dart code.
|
|
// See http://dartbug.com/20421 for details.
|
|
return;
|
|
}
|
|
uword* sp = reinterpret_cast<uword*>(sp_addr);
|
|
uword* buffer = sample->GetStackBuffer();
|
|
if (sp != NULL) {
|
|
for (intptr_t i = 0; i < Sample::kStackBufferSizeInWords; i++) {
|
|
MSAN_UNPOISON(sp, kWordSize);
|
|
ASAN_UNPOISON(sp, kWordSize);
|
|
buffer[i] = *sp;
|
|
sp++;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
#if defined(TARGET_OS_WINDOWS)
|
|
// On Windows this code is synchronously executed from the thread interrupter
|
|
// thread. This means we can safely have a static fault_address.
|
|
static uword fault_address = 0;
|
|
static LONG GuardPageExceptionFilter(EXCEPTION_POINTERS* ep) {
|
|
fault_address = 0;
|
|
if (ep->ExceptionRecord->ExceptionCode != STATUS_GUARD_PAGE_VIOLATION) {
|
|
return EXCEPTION_CONTINUE_SEARCH;
|
|
}
|
|
// https://goo.gl/p5Fe10
|
|
fault_address = ep->ExceptionRecord->ExceptionInformation[1];
|
|
// Read access.
|
|
ASSERT(ep->ExceptionRecord->ExceptionInformation[0] == 0);
|
|
return EXCEPTION_EXECUTE_HANDLER;
|
|
}
|
|
#endif
|
|
|
|
// All memory access done to collect the sample is performed in CollectSample.
|
|
static void CollectSample(Isolate* isolate,
|
|
bool exited_dart_code,
|
|
bool in_dart_code,
|
|
Sample* sample,
|
|
ProfilerNativeStackWalker* native_stack_walker,
|
|
ProfilerDartExitStackWalker* dart_exit_stack_walker,
|
|
ProfilerDartStackWalker* dart_stack_walker,
|
|
uword pc,
|
|
uword fp,
|
|
uword sp) {
|
|
#if defined(TARGET_OS_WINDOWS)
|
|
// Use structured exception handling to trap guard page access on Windows.
|
|
__try {
|
|
#endif
|
|
|
|
CopyStackBuffer(sample, sp);
|
|
CopyPCMarkerIfSafe(sample, fp, sp);
|
|
|
|
if (FLAG_profile_vm) {
|
|
// Always walk the native stack collecting both native and Dart frames.
|
|
native_stack_walker->walk();
|
|
} else if (exited_dart_code) {
|
|
// We have a valid exit frame info, use the Dart stack walker.
|
|
dart_exit_stack_walker->walk();
|
|
} else if (in_dart_code) {
|
|
// We are executing Dart code. We have frame pointers.
|
|
dart_stack_walker->walk();
|
|
} else {
|
|
sample->set_vm_tag(VMTag::kEmbedderTagId);
|
|
sample->SetAt(0, pc);
|
|
}
|
|
|
|
#if defined(TARGET_OS_WINDOWS)
|
|
// Use structured exception handling to trap guard page access.
|
|
} __except(GuardPageExceptionFilter(GetExceptionInformation())) {
|
|
// Sample collection triggered a guard page fault:
|
|
// 1) discard entire sample.
|
|
sample->set_ignore_sample(true);
|
|
|
|
// 2) Reenable guard bit on page that triggered the fault.
|
|
// https://goo.gl/5mCsXW
|
|
DWORD new_protect = PAGE_READWRITE | PAGE_GUARD;
|
|
DWORD old_protect = 0;
|
|
BOOL success = VirtualProtect(reinterpret_cast<void*>(fault_address),
|
|
sizeof(fault_address),
|
|
new_protect,
|
|
&old_protect);
|
|
USE(success);
|
|
ASSERT(success);
|
|
ASSERT(old_protect == PAGE_READWRITE);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
|
|
// Is |isolate| executing Dart code?
|
|
static bool ExecutingDart(Isolate* isolate) {
|
|
ASSERT(isolate != NULL);
|
|
return (isolate->top_exit_frame_info() == 0) &&
|
|
(isolate->vm_tag() == VMTag::kDartTagId);
|
|
}
|
|
|
|
|
|
// Has |isolate| exited Dart code?
|
|
static bool ExitedDart(Isolate* isolate) {
|
|
return (isolate->top_exit_frame_info() != 0) &&
|
|
(isolate->vm_tag() != VMTag::kDartTagId);
|
|
}
|
|
|
|
|
|
// Get |isolate|'s stack boundary and verify that |sp| and |fp| are within
|
|
// it. Return |false| if anything looks suspicious.
|
|
static bool GetAndValidateIsolateStackBounds(Isolate* isolate,
|
|
uintptr_t sp,
|
|
uintptr_t fp,
|
|
uword* stack_lower,
|
|
uword* stack_upper) {
|
|
ASSERT(isolate != NULL);
|
|
ASSERT(stack_lower != NULL);
|
|
ASSERT(stack_upper != NULL);
|
|
#if defined(USING_SIMULATOR)
|
|
Simulator* simulator = NULL;
|
|
#endif
|
|
|
|
#if defined(USING_SIMULATOR)
|
|
const bool in_dart_code = ExecutingDart(isolate);
|
|
if (in_dart_code) {
|
|
*stack_lower = simulator->StackBase();
|
|
*stack_upper = simulator->StackTop();
|
|
} else if (!isolate->GetProfilerStackBounds(stack_lower, stack_upper)) {
|
|
// Could not get stack boundary.
|
|
return false;
|
|
}
|
|
if ((*stack_lower == 0) || (*stack_upper == 0)) {
|
|
return false;
|
|
}
|
|
#else
|
|
if (!isolate->GetProfilerStackBounds(stack_lower, stack_upper) ||
|
|
(*stack_lower == 0) || (*stack_upper == 0)) {
|
|
// Could not get stack boundary.
|
|
return false;
|
|
}
|
|
#endif
|
|
if (sp > *stack_lower) {
|
|
// The stack pointer gives us a tighter lower bound.
|
|
*stack_lower = sp;
|
|
}
|
|
|
|
if (*stack_lower >= *stack_upper) {
|
|
// Stack boundary is invalid.
|
|
return false;
|
|
}
|
|
|
|
if ((sp < *stack_lower) || (sp >= *stack_upper)) {
|
|
// Stack pointer is outside isolate stack boundary.
|
|
return false;
|
|
}
|
|
|
|
if ((fp < *stack_lower) || (fp >= *stack_upper)) {
|
|
// Frame pointer is outside isolate stack boundary.
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
// Some simple sanity checking of |pc|, |sp|, and |fp|.
|
|
static bool InitialRegisterCheck(uintptr_t pc, uintptr_t sp, uintptr_t fp) {
|
|
if ((sp == 0) || (fp == 0) || (pc == 0)) {
|
|
// None of these registers should be zero.
|
|
return false;
|
|
}
|
|
|
|
if (sp > fp) {
|
|
// Assuming the stack grows down, we should never have a stack pointer above
|
|
// the frame pointer.
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
// Return |isolate|'s sample buffer.
|
|
static SampleBuffer* GetSampleBuffer(Isolate* isolate) {
|
|
IsolateProfilerData* profiler_data = isolate->profiler_data();
|
|
if (profiler_data == NULL) {
|
|
// Profiler not initialized.
|
|
return NULL;
|
|
}
|
|
SampleBuffer* sample_buffer = profiler_data->sample_buffer();
|
|
return sample_buffer;
|
|
}
|
|
|
|
|
|
static Sample* SetupSample(Isolate* isolate,
|
|
SampleBuffer* sample_buffer,
|
|
ThreadId tid) {
|
|
ASSERT(isolate != NULL);
|
|
ASSERT(sample_buffer != NULL);
|
|
Sample* sample = sample_buffer->ReserveSample();
|
|
sample->Init(isolate, OS::GetCurrentTimeMicros(), tid);
|
|
uword vm_tag = isolate->vm_tag();
|
|
#if defined(USING_SIMULATOR)
|
|
// When running in the simulator, the runtime entry function address
|
|
// (stored as the vm tag) is the address of a redirect function.
|
|
// Attempt to find the real runtime entry function address and use that.
|
|
uword redirect_vm_tag = Simulator::FunctionForRedirect(vm_tag);
|
|
if (redirect_vm_tag != 0) {
|
|
vm_tag = redirect_vm_tag;
|
|
}
|
|
#endif
|
|
sample->set_vm_tag(vm_tag);
|
|
sample->set_user_tag(isolate->user_tag());
|
|
return sample;
|
|
}
|
|
|
|
|
|
static bool CheckIsolate(Isolate* isolate) {
|
|
if ((isolate == NULL) || (Dart::vm_isolate() == NULL)) {
|
|
// No isolate.
|
|
return false;
|
|
}
|
|
ASSERT(isolate != Dart::vm_isolate());
|
|
return true;
|
|
}
|
|
|
|
|
|
#if defined(TARGET_OS_WINDOWS)
|
|
__declspec(noinline)
|
|
static uintptr_t GetProgramCounter() {
|
|
return reinterpret_cast<uintptr_t>(_ReturnAddress());
|
|
}
|
|
#else
|
|
static uintptr_t __attribute__((noinline)) GetProgramCounter() {
|
|
return reinterpret_cast<uintptr_t>(
|
|
__builtin_extract_return_addr(__builtin_return_address(0)));
|
|
}
|
|
#endif
|
|
|
|
void Profiler::RecordAllocation(Isolate* isolate, intptr_t cid) {
|
|
if (!CheckIsolate(isolate)) {
|
|
return;
|
|
}
|
|
|
|
const bool exited_dart_code = ExitedDart(isolate);
|
|
|
|
if (!exited_dart_code && !FLAG_profile_vm) {
|
|
// No Dart frames on stack and we are not profiling the vm.
|
|
return;
|
|
}
|
|
|
|
SampleBuffer* sample_buffer = GetSampleBuffer(isolate);
|
|
if (sample_buffer == NULL) {
|
|
// Profiler not initialized.
|
|
return;
|
|
}
|
|
|
|
if (FLAG_profile_vm) {
|
|
uintptr_t sp = Isolate::GetCurrentStackPointer();
|
|
uintptr_t fp = 0;
|
|
uintptr_t pc = GetProgramCounter();
|
|
|
|
COPY_FP_REGISTER(fp);
|
|
|
|
uword stack_lower = 0;
|
|
uword stack_upper = 0;
|
|
|
|
if (!InitialRegisterCheck(pc, sp, fp)) {
|
|
return;
|
|
}
|
|
|
|
if (!GetAndValidateIsolateStackBounds(isolate,
|
|
sp,
|
|
fp,
|
|
&stack_lower,
|
|
&stack_upper)) {
|
|
// Could not get stack boundary.
|
|
return;
|
|
}
|
|
|
|
Sample* sample = SetupSample(isolate,
|
|
sample_buffer,
|
|
OSThread::GetCurrentThreadId());
|
|
sample->SetAllocationCid(cid);
|
|
ProfilerNativeStackWalker native_stack_walker(sample,
|
|
stack_lower,
|
|
stack_upper,
|
|
pc,
|
|
fp,
|
|
sp);
|
|
native_stack_walker.walk();
|
|
} else {
|
|
ASSERT(exited_dart_code);
|
|
Sample* sample = SetupSample(isolate,
|
|
sample_buffer,
|
|
OSThread::GetCurrentThreadId());
|
|
sample->SetAllocationCid(cid);
|
|
ProfilerDartExitStackWalker dart_exit_stack_walker(isolate, sample);
|
|
dart_exit_stack_walker.walk();
|
|
}
|
|
}
|
|
|
|
|
|
void Profiler::RecordSampleInterruptCallback(
|
|
const InterruptedThreadState& state,
|
|
void* data) {
|
|
Isolate* isolate = reinterpret_cast<Isolate*>(data);
|
|
if ((isolate == NULL) || (Dart::vm_isolate() == NULL)) {
|
|
// No isolate.
|
|
return;
|
|
}
|
|
ASSERT(isolate != Dart::vm_isolate());
|
|
|
|
SampleBuffer* sample_buffer = GetSampleBuffer(isolate);
|
|
if (sample_buffer == NULL) {
|
|
// Profiler not initialized.
|
|
return;
|
|
}
|
|
|
|
const bool exited_dart_code = ExitedDart(isolate);
|
|
const bool in_dart_code = ExecutingDart(isolate);
|
|
|
|
uintptr_t sp = 0;
|
|
uintptr_t fp = state.fp;
|
|
uintptr_t pc = state.pc;
|
|
#if defined(USING_SIMULATOR)
|
|
Simulator* simulator = NULL;
|
|
#endif
|
|
|
|
if (in_dart_code) {
|
|
// If we're in Dart code, use the Dart stack pointer.
|
|
#if defined(USING_SIMULATOR)
|
|
simulator = isolate->simulator();
|
|
sp = simulator->get_register(SPREG);
|
|
fp = simulator->get_register(FPREG);
|
|
pc = simulator->get_pc();
|
|
#else
|
|
sp = state.dsp;
|
|
#endif
|
|
} else {
|
|
// If we're in runtime code, use the C stack pointer.
|
|
sp = state.csp;
|
|
}
|
|
|
|
if (!InitialRegisterCheck(pc, sp, fp)) {
|
|
return;
|
|
}
|
|
|
|
if (StubCode::InJumpToExceptionHandlerStub(pc)) {
|
|
// The JumpToExceptionHandler stub manually adjusts the stack pointer,
|
|
// frame pointer, and some isolate state before jumping to a catch entry.
|
|
// It is not safe to walk the stack when executing this stub.
|
|
return;
|
|
}
|
|
|
|
uword stack_lower = 0;
|
|
uword stack_upper = 0;
|
|
if (!GetAndValidateIsolateStackBounds(isolate,
|
|
sp,
|
|
fp,
|
|
&stack_lower,
|
|
&stack_upper)) {
|
|
// Could not get stack boundary.
|
|
return;
|
|
}
|
|
|
|
// At this point we have a valid stack boundary for this isolate and
|
|
// know that our initial stack and frame pointers are within the boundary.
|
|
|
|
// Setup sample.
|
|
Sample* sample = SetupSample(isolate,
|
|
sample_buffer,
|
|
OSThread::GetCurrentThreadId());
|
|
// Increment counter for vm tag.
|
|
VMTagCounters* counters = isolate->vm_tag_counters();
|
|
ASSERT(counters != NULL);
|
|
counters->Increment(sample->vm_tag());
|
|
|
|
ProfilerNativeStackWalker native_stack_walker(sample,
|
|
stack_lower,
|
|
stack_upper,
|
|
pc,
|
|
fp,
|
|
sp);
|
|
|
|
ProfilerDartExitStackWalker dart_exit_stack_walker(isolate, sample);
|
|
|
|
ProfilerDartStackWalker dart_stack_walker(sample,
|
|
stack_lower,
|
|
stack_upper,
|
|
pc,
|
|
fp,
|
|
sp);
|
|
|
|
// All memory access is done inside CollectSample.
|
|
CollectSample(isolate,
|
|
exited_dart_code,
|
|
in_dart_code,
|
|
sample,
|
|
&native_stack_walker,
|
|
&dart_exit_stack_walker,
|
|
&dart_stack_walker,
|
|
pc,
|
|
fp,
|
|
sp);
|
|
}
|
|
|
|
|
|
ProcessedSampleBuffer* SampleBuffer::BuildProcessedSampleBuffer(
|
|
SampleFilter* filter) {
|
|
ASSERT(filter != NULL);
|
|
Thread* thread = Thread::Current();
|
|
Zone* zone = thread->zone();
|
|
|
|
ProcessedSampleBuffer* buffer = new(zone) ProcessedSampleBuffer();
|
|
|
|
const intptr_t length = capacity();
|
|
for (intptr_t i = 0; i < length; i++) {
|
|
Sample* sample = At(i);
|
|
if (sample->ignore_sample()) {
|
|
// Bad sample.
|
|
continue;
|
|
}
|
|
if (sample->isolate() != filter->isolate()) {
|
|
// Another isolate.
|
|
continue;
|
|
}
|
|
if (sample->timestamp() == 0) {
|
|
// Empty.
|
|
continue;
|
|
}
|
|
if (sample->At(0) == 0) {
|
|
// No frames.
|
|
continue;
|
|
}
|
|
if (!filter->FilterSample(sample)) {
|
|
// Did not pass filter.
|
|
continue;
|
|
}
|
|
buffer->Add(BuildProcessedSample(sample));
|
|
}
|
|
return buffer;
|
|
}
|
|
|
|
|
|
ProcessedSample* SampleBuffer::BuildProcessedSample(Sample* sample) {
|
|
Thread* thread = Thread::Current();
|
|
Zone* zone = thread->zone();
|
|
|
|
ProcessedSample* processed_sample = new(zone) ProcessedSample();
|
|
|
|
// Copy state bits from sample.
|
|
processed_sample->set_timestamp(sample->timestamp());
|
|
processed_sample->set_vm_tag(sample->vm_tag());
|
|
processed_sample->set_user_tag(sample->user_tag());
|
|
if (sample->is_allocation_sample()) {
|
|
processed_sample->set_allocation_cid(sample->allocation_cid());
|
|
}
|
|
processed_sample->set_first_frame_executing(!sample->exit_frame_sample());
|
|
|
|
// Copy stack trace from sample(s).
|
|
bool truncated = false;
|
|
Sample* current = sample;
|
|
while (current != NULL) {
|
|
for (intptr_t i = 0; i < FLAG_profile_depth; i++) {
|
|
if (current->At(i) == 0) {
|
|
break;
|
|
}
|
|
processed_sample->Add(current->At(i));
|
|
}
|
|
|
|
truncated = truncated || current->truncated_trace();
|
|
current = Next(sample);
|
|
}
|
|
|
|
if (!sample->exit_frame_sample()) {
|
|
Isolate* isolate = thread->isolate();
|
|
Isolate* vm_isolate = Dart::vm_isolate();
|
|
processed_sample->FixupCaller(isolate,
|
|
vm_isolate,
|
|
sample->pc_marker(),
|
|
sample->GetStackBuffer());
|
|
}
|
|
|
|
processed_sample->set_truncated(truncated);
|
|
return processed_sample;
|
|
}
|
|
|
|
|
|
Sample* SampleBuffer::Next(Sample* sample) {
|
|
// TODO(johnmccutchan): Support chaining samples for complete stack traces.
|
|
return NULL;
|
|
}
|
|
|
|
|
|
ProcessedSample::ProcessedSample()
|
|
: pcs_(FLAG_profile_depth),
|
|
timestamp_(0),
|
|
vm_tag_(0),
|
|
user_tag_(0),
|
|
allocation_cid_(-1),
|
|
truncated_(false) {
|
|
}
|
|
|
|
|
|
void ProcessedSample::FixupCaller(Isolate* isolate,
|
|
Isolate* vm_isolate,
|
|
uword pc_marker,
|
|
uword* stack_buffer) {
|
|
REUSABLE_CODE_HANDLESCOPE(isolate);
|
|
// Lookup code object for leaf frame.
|
|
Code& code = reused_code_handle.Handle();
|
|
code = FindCodeForPC(isolate, vm_isolate, At(0));
|
|
if (code.IsNull()) {
|
|
return;
|
|
}
|
|
if (code.compile_timestamp() > timestamp()) {
|
|
// Code compiled after sample. Ignore.
|
|
return;
|
|
}
|
|
CheckForMissingDartFrame(isolate, vm_isolate, code, pc_marker, stack_buffer);
|
|
}
|
|
|
|
|
|
void ProcessedSample::CheckForMissingDartFrame(Isolate* isolate,
|
|
Isolate* vm_isolate,
|
|
const Code& code,
|
|
uword pc_marker,
|
|
uword* stack_buffer) {
|
|
// Some stubs (and intrinsics) do not push a frame onto the stack leaving
|
|
// the frame pointer in the caller.
|
|
//
|
|
// PC -> STUB
|
|
// FP -> DART3 <-+
|
|
// DART2 <-| <- TOP FRAME RETURN ADDRESS.
|
|
// DART1 <-|
|
|
// .....
|
|
//
|
|
// In this case, traversing the linked stack frames will not collect a PC
|
|
// inside DART3. The stack will incorrectly be: STUB, DART2, DART1.
|
|
// In Dart code, after pushing the FP onto the stack, an IP in the current
|
|
// function is pushed onto the stack as well. This stack slot is called
|
|
// the PC marker. We can use the PC marker to insert DART3 into the stack
|
|
// so that it will correctly be: STUB, DART3, DART2, DART1. Note the
|
|
// inserted PC may not accurately reflect the true return address into DART3.
|
|
ASSERT(!code.IsNull());
|
|
|
|
// The pc marker is our current best guess of a return address.
|
|
uword return_address = pc_marker;
|
|
|
|
// Attempt to find a better return address.
|
|
ReturnAddressLocator ral(At(0), stack_buffer, code);
|
|
|
|
if (!ral.LocateReturnAddress(&return_address)) {
|
|
ASSERT(return_address == pc_marker);
|
|
if (code.GetPrologueOffset() == 0) {
|
|
// Code has the prologue at offset 0. The frame is already setup and
|
|
// can be trusted.
|
|
return;
|
|
}
|
|
// Could not find a better return address than the pc_marker.
|
|
if (code.ContainsInstructionAt(return_address)) {
|
|
// PC marker is in the same code as pc, no missing frame.
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (!ContainedInDartCodeHeaps(isolate, vm_isolate, return_address)) {
|
|
// return address is not from the Dart heap. Do not insert.
|
|
return;
|
|
}
|
|
|
|
if (return_address != 0) {
|
|
InsertAt(1, return_address);
|
|
}
|
|
}
|
|
|
|
|
|
RawCode* ProcessedSample::FindCodeForPC(Isolate* isolate,
|
|
Isolate* vm_isolate,
|
|
uword pc) {
|
|
// Check current isolate for pc.
|
|
if (isolate->heap()->CodeContains(pc)) {
|
|
return Code::LookupCode(pc);
|
|
}
|
|
|
|
// Check VM isolate for pc.
|
|
if (vm_isolate->heap()->CodeContains(pc)) {
|
|
return Code::LookupCodeInVmIsolate(pc);
|
|
}
|
|
|
|
return Code::null();
|
|
}
|
|
|
|
|
|
bool ProcessedSample::ContainedInDartCodeHeaps(Isolate* isolate,
|
|
Isolate* vm_isolate,
|
|
uword pc) {
|
|
return vm_isolate->heap()->CodeContains(pc)
|
|
|| isolate->heap()->CodeContains(pc);
|
|
}
|
|
|
|
|
|
ProcessedSampleBuffer::ProcessedSampleBuffer() {
|
|
}
|
|
|
|
} // namespace dart
|