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// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#ifndef RUNTIME_VM_PROFILER_H_
#define RUNTIME_VM_PROFILER_H_
#include "platform/atomic.h"
#include "vm/allocation.h"
#include "vm/bitfield.h"
#include "vm/code_observers.h"
#include "vm/globals.h"
#include "vm/growable_array.h"
#include "vm/native_symbol.h"
#include "vm/object.h"
#include "vm/tags.h"
#include "vm/thread_interrupter.h"
// Profiler sampling and stack walking support.
// NOTE: For service related code, see profile_service.h.
namespace dart {
// Forward declarations.
class ProcessedSample;
class ProcessedSampleBuffer;
class Sample;
class SampleBlock;
#define PROFILER_COUNTERS(V) \
V(bail_out_unknown_task) \
V(bail_out_jump_to_exception_handler) \
V(bail_out_check_isolate) \
V(single_frame_sample_deoptimizing) \
V(single_frame_sample_get_and_validate_stack_bounds) \
V(stack_walker_native) \
V(stack_walker_dart_exit) \
V(stack_walker_dart) \
V(stack_walker_none) \
V(incomplete_sample_fp_bounds) \
V(incomplete_sample_fp_step) \
V(incomplete_sample_bad_pc) \
V(sample_allocation_failure)
struct ProfilerCounters {
#define DECLARE_PROFILER_COUNTER(name) RelaxedAtomic<int64_t> name;
PROFILER_COUNTERS(DECLARE_PROFILER_COUNTER)
#undef DECLARE_PROFILER_COUNTER
};
class Profiler : public AllStatic {
public:
static void Init();
static void Cleanup();
static void SetSampleDepth(intptr_t depth);
static void SetSamplePeriod(intptr_t period);
// Restarts sampling with a given profile period. This is called after the
// profile period is changed via the service protocol.
static void UpdateSamplePeriod();
// Starts or shuts down the profiler after --profiler is changed via the
// service protocol.
static void UpdateRunningState();
static SampleBlockBuffer* sample_block_buffer() {
return sample_block_buffer_;
}
static void set_sample_block_buffer(SampleBlockBuffer* buffer) {
sample_block_buffer_ = buffer;
}
static void DumpStackTrace(void* context);
static void DumpStackTrace(bool for_crash = true);
static void SampleAllocation(Thread* thread,
intptr_t cid,
uint32_t identity_hash);
// SampleThread is called from inside the signal handler and hence it is very
// critical that the implementation of SampleThread does not do any of the
// following:
// * Accessing TLS -- Because on Fuchsia, Mac and Windows the callback will
// be running in a different thread.
// * Allocating memory -- Because this takes locks which may already be
// held, resulting in a dead lock.
// * Taking a lock -- See above.
static void SampleThread(Thread* thread, const InterruptedThreadState& state);
static ProfilerCounters counters() {
// Copies the counter values.
return counters_;
}
inline static intptr_t Size();
static void ProcessCompletedBlocks(Isolate* isolate);
static void IsolateShutdown(Thread* thread);
private:
static void DumpStackTrace(uword sp, uword fp, uword pc, bool for_crash);
// Calculates the sample buffer capacity. Returns
// SampleBuffer::kDefaultBufferCapacity if --sample-buffer-duration is not
// provided. Otherwise, the capacity is based on the sample rate, maximum
// sample stack depth, and the number of seconds of samples the sample buffer
// should be able to accomodate.
static intptr_t CalculateSampleBufferCapacity();
// Does not walk the thread's stack.
static void SampleThreadSingleFrame(Thread* thread,
Sample* sample,
uintptr_t pc);
static RelaxedAtomic<bool> initialized_;
static SampleBlockBuffer* sample_block_buffer_;
static ProfilerCounters counters_;
friend class Thread;
};
class SampleVisitor : public ValueObject {
public:
explicit SampleVisitor(Dart_Port port) : port_(port), visited_(0) {}
virtual ~SampleVisitor() {}
virtual void VisitSample(Sample* sample) = 0;
virtual void Reset() { visited_ = 0; }
intptr_t visited() const { return visited_; }
void IncrementVisited() { visited_++; }
Dart_Port port() const { return port_; }
private:
Dart_Port port_;
intptr_t visited_;
DISALLOW_IMPLICIT_CONSTRUCTORS(SampleVisitor);
};
class SampleFilter : public ValueObject {
public:
SampleFilter(Dart_Port port,
intptr_t thread_task_mask,
int64_t time_origin_micros,
int64_t time_extent_micros,
bool take_samples = false)
: port_(port),
thread_task_mask_(thread_task_mask),
time_origin_micros_(time_origin_micros),
time_extent_micros_(time_extent_micros),
take_samples_(take_samples) {
ASSERT(thread_task_mask != 0);
ASSERT(time_origin_micros_ >= -1);
ASSERT(time_extent_micros_ >= -1);
}
virtual ~SampleFilter() {}
// Override this function.
// Return |true| if |sample| passes the filter.
virtual bool FilterSample(Sample* sample) { return true; }
Dart_Port port() const { return port_; }
// Returns |true| if |sample| passes the time filter.
bool TimeFilterSample(Sample* sample);
// Returns |true| if |sample| passes the thread task filter.
bool TaskFilterSample(Sample* sample);
bool take_samples() const { return take_samples_; }
static constexpr intptr_t kNoTaskFilter = -1;
private:
Dart_Port port_;
intptr_t thread_task_mask_;
int64_t time_origin_micros_;
int64_t time_extent_micros_;
bool take_samples_;
};
class ClearProfileVisitor : public SampleVisitor {
public:
explicit ClearProfileVisitor(Isolate* isolate);
virtual void VisitSample(Sample* sample);
};
// Each Sample holds a stack trace from an isolate.
class Sample {
public:
Sample() = default;
void Init(Dart_Port port, int64_t timestamp, ThreadId tid) {
Clear();
timestamp_ = timestamp;
tid_ = tid;
port_ = port;
next_ = nullptr;
}
Dart_Port port() const { return port_; }
// Thread sample was taken on.
ThreadId tid() const { return tid_; }
void Clear() {
timestamp_ = 0;
port_ = ILLEGAL_PORT;
tid_ = OSThread::kInvalidThreadId;
for (intptr_t i = 0; i < kStackBufferSizeInWords; i++) {
stack_buffer_[i] = 0;
}
for (intptr_t i = 0; i < kPCArraySizeInWords; i++) {
pc_array_[i] = 0;
}
vm_tag_ = VMTag::kInvalidTagId;
user_tag_ = UserTags::kDefaultUserTag;
state_ = 0;
next_ = nullptr;
allocation_identity_hash_ = 0;
set_head_sample(true);
}
// Timestamp sample was taken at.
int64_t timestamp() const { return timestamp_; }
// Top most pc.
uword pc() const { return At(0); }
// Get stack trace entry.
uword At(intptr_t i) const {
ASSERT(i >= 0);
ASSERT(i < kPCArraySizeInWords);
return pc_array_[i];
}
// Set stack trace entry.
void SetAt(intptr_t i, uword pc) {
ASSERT(i >= 0);
ASSERT(i < kPCArraySizeInWords);
pc_array_[i] = pc;
}
void DumpStackTrace() {
for (intptr_t i = 0; i < kPCArraySizeInWords; ++i) {
uintptr_t start = 0;
uword pc = At(i);
const char* native_symbol_name =
NativeSymbolResolver::LookupSymbolName(pc, &start);
if (native_symbol_name == nullptr) {
OS::PrintErr(" [0x%" Pp "] Unknown symbol\n", pc);
} else {
OS::PrintErr(" [0x%" Pp "] %s\n", pc, native_symbol_name);
NativeSymbolResolver::FreeSymbolName(native_symbol_name);
}
}
}
uword vm_tag() const { return vm_tag_; }
void set_vm_tag(uword tag) {
ASSERT(tag != VMTag::kInvalidTagId);
vm_tag_ = tag;
}
uword user_tag() const { return user_tag_; }
void set_user_tag(uword tag) { user_tag_ = tag; }
bool leaf_frame_is_dart() const { return LeafFrameIsDart::decode(state_); }
void set_leaf_frame_is_dart(bool leaf_frame_is_dart) {
state_ = LeafFrameIsDart::update(leaf_frame_is_dart, state_);
}
bool ignore_sample() const { return IgnoreBit::decode(state_); }
void set_ignore_sample(bool ignore_sample) {
state_ = IgnoreBit::update(ignore_sample, state_);
}
bool exit_frame_sample() const { return ExitFrameBit::decode(state_); }
void set_exit_frame_sample(bool exit_frame_sample) {
state_ = ExitFrameBit::update(exit_frame_sample, state_);
}
bool missing_frame_inserted() const {
return MissingFrameInsertedBit::decode(state_);
}
void set_missing_frame_inserted(bool missing_frame_inserted) {
state_ = MissingFrameInsertedBit::update(missing_frame_inserted, state_);
}
bool truncated_trace() const { return TruncatedTraceBit::decode(state_); }
void set_truncated_trace(bool truncated_trace) {
state_ = TruncatedTraceBit::update(truncated_trace, state_);
}
bool is_allocation_sample() const {
return ClassAllocationSampleBit::decode(state_);
}
void set_is_allocation_sample(bool allocation_sample) {
state_ = ClassAllocationSampleBit::update(allocation_sample, state_);
}
uint32_t allocation_identity_hash() const {
return allocation_identity_hash_;
}
void set_allocation_identity_hash(uint32_t hash) {
allocation_identity_hash_ = hash;
}
Thread::TaskKind thread_task() const { return ThreadTaskBit::decode(state_); }
void set_thread_task(Thread::TaskKind task) {
state_ = ThreadTaskBit::update(task, state_);
}
bool is_continuation_sample() const {
return ContinuationSampleBit::decode(state_);
}
void SetContinuation(Sample* next) {
ASSERT(!is_continuation_sample());
ASSERT(next_ == nullptr);
state_ = ContinuationSampleBit::update(true, state_);
next_ = next;
}
Sample* continuation_sample() const { return next_; }
intptr_t allocation_cid() const {
ASSERT(is_allocation_sample());
return metadata();
}
void set_head_sample(bool head_sample) {
state_ = HeadSampleBit::update(head_sample, state_);
}
bool head_sample() const { return HeadSampleBit::decode(state_); }
intptr_t metadata() const { return MetadataBits::decode(state_); }
void set_metadata(intptr_t metadata) {
state_ = MetadataBits::update(metadata, state_);
}
void SetAllocationCid(intptr_t cid) {
set_is_allocation_sample(true);
set_metadata(cid);
}
static constexpr int kPCArraySizeInWords = 32;
uword* GetPCArray() { return &pc_array_[0]; }
static constexpr int kStackBufferSizeInWords = 2;
uword* GetStackBuffer() { return &stack_buffer_[0]; }
private:
int64_t timestamp_;
Dart_Port port_;
ThreadId tid_;
uword stack_buffer_[kStackBufferSizeInWords];
uword pc_array_[kPCArraySizeInWords];
uword vm_tag_;
uword user_tag_;
uint32_t state_;
Sample* next_;
uint32_t allocation_identity_hash_;
using HeadSampleBit = BitField<decltype(state_), bool, 0, 1>;
using LeafFrameIsDart =
BitField<decltype(state_), bool, HeadSampleBit::kNextBit, 1>;
using IgnoreBit =
BitField<decltype(state_), bool, LeafFrameIsDart::kNextBit, 1>;
using ExitFrameBit = BitField<uint32_t, bool, IgnoreBit::kNextBit, 1>;
using MissingFrameInsertedBit =
BitField<decltype(state_), bool, ExitFrameBit::kNextBit, 1>;
using TruncatedTraceBit =
BitField<decltype(state_), bool, MissingFrameInsertedBit::kNextBit, 1>;
using ClassAllocationSampleBit =
BitField<decltype(state_), bool, TruncatedTraceBit::kNextBit, 1>;
using ContinuationSampleBit =
BitField<decltype(state_), bool, ClassAllocationSampleBit::kNextBit, 1>;
using ThreadTaskBit = BitField<decltype(state_),
Thread::TaskKind,
ContinuationSampleBit::kNextBit,
4>;
using MetadataBits = BitField<decltype(state_),
intptr_t,
ThreadTaskBit::kNextBit,
UntaggedObject::kClassIdTagSize>;
DISALLOW_COPY_AND_ASSIGN(Sample);
};
class AbstractCode {
public:
explicit AbstractCode(ObjectPtr code) : code_(Object::Handle(code)) {
ASSERT(code_.IsNull() || code_.IsCode());
}
ObjectPtr ptr() const { return code_.ptr(); }
const Object* handle() const { return &code_; }
uword PayloadStart() const {
ASSERT(code_.IsCode());
return Code::Cast(code_).PayloadStart();
}
uword Size() const {
ASSERT(code_.IsCode());
return Code::Cast(code_).Size();
}
int64_t compile_timestamp() const {
if (code_.IsCode()) {
return Code::Cast(code_).compile_timestamp();
} else {
return 0;
}
}
const char* Name() const {
if (code_.IsCode()) {
return Code::Cast(code_).Name();
} else {
return "";
}
}
const char* QualifiedName() const {
if (code_.IsCode()) {
return Code::Cast(code_).QualifiedName(
NameFormattingParams(Object::kUserVisibleName));
} else {
return "";
}
}
bool IsStubCode() const {
if (code_.IsCode()) {
return Code::Cast(code_).IsStubCode();
} else {
return false;
}
}
bool IsAllocationStubCode() const {
if (code_.IsCode()) {
return Code::Cast(code_).IsAllocationStubCode();
} else {
return false;
}
}
bool IsTypeTestStubCode() const {
if (code_.IsCode()) {
return Code::Cast(code_).IsTypeTestStubCode();
} else {
return false;
}
}
ObjectPtr owner() const {
if (code_.IsCode()) {
return Code::Cast(code_).owner();
} else {
return Object::null();
}
}
bool IsNull() const { return code_.IsNull(); }
bool IsCode() const { return code_.IsCode(); }
bool is_optimized() const {
if (code_.IsCode()) {
return Code::Cast(code_).is_optimized();
} else {
return false;
}
}
private:
const Object& code_;
};
// A Code object descriptor.
class CodeDescriptor : public ZoneAllocated {
public:
explicit CodeDescriptor(const AbstractCode code);
uword Start() const;
uword Size() const;
int64_t CompileTimestamp() const;
const AbstractCode code() const { return code_; }
const char* Name() const { return code_.Name(); }
bool Contains(uword pc) const {
uword end = Start() + Size();
return (pc >= Start()) && (pc < end);
}
static int Compare(CodeDescriptor* const* a, CodeDescriptor* const* b) {
ASSERT(a != nullptr);
ASSERT(b != nullptr);
uword a_start = (*a)->Start();
uword b_start = (*b)->Start();
if (a_start < b_start) {
return -1;
} else if (a_start > b_start) {
return 1;
} else {
return 0;
}
}
private:
const AbstractCode code_;
DISALLOW_COPY_AND_ASSIGN(CodeDescriptor);
};
// Fast lookup of Dart code objects.
class CodeLookupTable : public ZoneAllocated {
public:
explicit CodeLookupTable(Thread* thread);
intptr_t length() const { return code_objects_.length(); }
const CodeDescriptor* At(intptr_t index) const {
return code_objects_.At(index);
}
const CodeDescriptor* FindCode(uword pc) const;
private:
void Build(Thread* thread);
void Add(const Object& code);
// Code objects sorted by entry.
ZoneGrowableArray<CodeDescriptor*> code_objects_;
friend class CodeLookupTableBuilder;
DISALLOW_COPY_AND_ASSIGN(CodeLookupTable);
};
class SampleBuffer {
public:
SampleBuffer() = default;
virtual ~SampleBuffer() = default;
virtual void Init(Sample* samples, intptr_t capacity) {
ASSERT(samples != nullptr);
ASSERT(capacity > 0);
samples_ = samples;
capacity_ = capacity;
}
void VisitSamples(SampleVisitor* visitor) {
ASSERT(visitor != nullptr);
const intptr_t length = capacity();
for (intptr_t i = 0; i < length; i++) {
Sample* sample = At(i);
if (!sample->head_sample()) {
// An inner sample in a chain of samples.
continue;
}
if (sample->ignore_sample()) {
// Bad sample.
continue;
}
if (sample->port() != visitor->port()) {
// Another isolate.
continue;
}
if (sample->timestamp() == 0) {
// Empty.
continue;
}
if (sample->At(0) == 0) {
// No frames.
continue;
}
visitor->IncrementVisited();
visitor->VisitSample(sample);
}
}
virtual Sample* ReserveSample() = 0;
virtual Sample* ReserveSampleAndLink(Sample* previous) = 0;
Sample* At(intptr_t idx) const {
ASSERT(idx >= 0);
ASSERT(idx < capacity_);
return &samples_[idx];
}
intptr_t capacity() const { return capacity_; }
ProcessedSampleBuffer* BuildProcessedSampleBuffer(
SampleFilter* filter,
ProcessedSampleBuffer* buffer = nullptr);
protected:
Sample* Next(Sample* sample);
ProcessedSample* BuildProcessedSample(Sample* sample,
const CodeLookupTable& clt);
Sample* samples_;
intptr_t capacity_;
DISALLOW_COPY_AND_ASSIGN(SampleBuffer);
};
class SampleBlock : public SampleBuffer {
public:
// The default number of samples per block. Overridden by some tests.
static constexpr intptr_t kSamplesPerBlock = 100;
SampleBlock() = default;
virtual ~SampleBlock() = default;
// Returns the number of samples contained within this block.
intptr_t capacity() const { return capacity_; }
Isolate* owner() const { return owner_; }
void set_owner(Isolate* isolate) { owner_ = isolate; }
virtual Sample* ReserveSample();
virtual Sample* ReserveSampleAndLink(Sample* previous);
bool TryAllocateFree() {
State expected = kFree;
State desired = kSampling;
std::memory_order success_order = std::memory_order_acquire;
std::memory_order failure_order = std::memory_order_relaxed;
return state_.compare_exchange_strong(expected, desired, success_order,
failure_order);
}
bool TryAllocateCompleted() {
State expected = kCompleted;
State desired = kSampling;
std::memory_order success_order = std::memory_order_acquire;
std::memory_order failure_order = std::memory_order_relaxed;
if (state_.compare_exchange_strong(expected, desired, success_order,
failure_order)) {
owner_ = nullptr;
cursor_ = 0;
return true;
}
return false;
}
void MarkCompleted() {
ASSERT(state_.load(std::memory_order_relaxed) == kSampling);
state_.store(kCompleted, std::memory_order_release);
}
bool TryAcquireStreaming(Isolate* isolate) {
if (state_.load(std::memory_order_relaxed) != kCompleted) return false;
if (owner_ != isolate) return false;
State expected = kCompleted;
State desired = kStreaming;
std::memory_order success_order = std::memory_order_acquire;
std::memory_order failure_order = std::memory_order_relaxed;
return state_.compare_exchange_strong(expected, desired, success_order,
failure_order);
}
void StreamingToCompleted() {
ASSERT(state_.load(std::memory_order_relaxed) == kStreaming);
state_.store(kCompleted, std::memory_order_relaxed);
}
void StreamingToFree() {
ASSERT(state_.load(std::memory_order_relaxed) == kStreaming);
owner_ = nullptr;
cursor_ = 0;
state_.store(kFree, std::memory_order_release);
}
void FreeCompleted() {
State expected = kCompleted;
State desired = kStreaming;
std::memory_order success_order = std::memory_order_acquire;
std::memory_order failure_order = std::memory_order_relaxed;
if (state_.compare_exchange_strong(expected, desired, success_order,
failure_order)) {
StreamingToFree();
}
}
protected:
bool HasStreamableSamples(const GrowableObjectArray& tag_table, UserTag* tag);
enum State : uint32_t {
kFree,
kSampling, // I.e., writing.
kCompleted,
kStreaming, // I.e., reading.
};
std::atomic<State> state_ = kFree;
RelaxedAtomic<uint32_t> cursor_ = 0;
Isolate* owner_ = nullptr;
private:
friend class SampleBlockListProcessor;
friend class SampleBlockBuffer;
DISALLOW_COPY_AND_ASSIGN(SampleBlock);
};
class SampleBlockBuffer {
public:
static constexpr intptr_t kDefaultBlockCount = 600;
// Creates a SampleBlockBuffer with a predetermined number of blocks.
//
// Defaults to kDefaultBlockCount blocks. Block size is fixed to
// SampleBlock::kSamplesPerBlock samples per block, except for in tests.
explicit SampleBlockBuffer(
intptr_t blocks = kDefaultBlockCount,
intptr_t samples_per_block = SampleBlock::kSamplesPerBlock);
virtual ~SampleBlockBuffer();
void VisitSamples(SampleVisitor* visitor) {
ASSERT(visitor != nullptr);
for (intptr_t i = 0; i < capacity_; ++i) {
blocks_[i].VisitSamples(visitor);
}
}
void FreeCompletedBlocks();
// Reserves a sample for a CPU profile.
//
// Returns nullptr when a sample can't be reserved.
Sample* ReserveCPUSample(Isolate* isolate);
// Reserves a sample for a Dart object allocation profile.
//
// Returns nullptr when a sample can't be reserved.
Sample* ReserveAllocationSample(Isolate* isolate);
intptr_t Size() const { return memory_->size(); }
ProcessedSampleBuffer* BuildProcessedSampleBuffer(
Isolate* isolate,
SampleFilter* filter,
ProcessedSampleBuffer* buffer = nullptr);
private:
Sample* ReserveSampleImpl(Isolate* isolate, bool allocation_sample);
// Returns nullptr if there are no available blocks.
SampleBlock* ReserveSampleBlock();
// Sample block management.
RelaxedAtomic<int> cursor_;
SampleBlock* blocks_;
intptr_t capacity_;
// Sample buffer management.
VirtualMemory* memory_;
Sample* sample_buffer_;
friend class Isolate;
DISALLOW_COPY_AND_ASSIGN(SampleBlockBuffer);
};
intptr_t Profiler::Size() {
intptr_t size = 0;
if (sample_block_buffer_ != nullptr) {
size += sample_block_buffer_->Size();
}
return size;
}
// A |ProcessedSample| is a combination of 1 (or more) |Sample|(s) that have
// been merged into a logical sample. The raw data may have been processed to
// improve the quality of the stack trace.
class ProcessedSample : public ZoneAllocated {
public:
ProcessedSample();
// Add |pc| to stack trace.
void Add(uword pc) { pcs_.Add(pc); }
// Insert |pc| at |index|.
void InsertAt(intptr_t index, uword pc) { pcs_.InsertAt(index, pc); }
// Number of pcs in stack trace.
intptr_t length() const { return pcs_.length(); }
// Get |pc| at |index|.
uword At(intptr_t index) const {
ASSERT(index >= 0);
ASSERT(index < length());
return pcs_[index];
}
// Timestamp sample was taken at.
int64_t timestamp() const { return timestamp_; }
void set_timestamp(int64_t timestamp) { timestamp_ = timestamp; }
ThreadId tid() const { return tid_; }
void set_tid(ThreadId tid) { tid_ = tid; }
// The VM tag.
uword vm_tag() const { return vm_tag_; }
void set_vm_tag(uword tag) { vm_tag_ = tag; }
// The user tag.
uword user_tag() const { return user_tag_; }
void set_user_tag(uword tag) { user_tag_ = tag; }
// The class id if this is an allocation profile sample. -1 otherwise.
intptr_t allocation_cid() const { return allocation_cid_; }
void set_allocation_cid(intptr_t cid) { allocation_cid_ = cid; }
// The identity hash code of the allocated object if this is an allocation
// profile sample. -1 otherwise.
uint32_t allocation_identity_hash() const {
return allocation_identity_hash_;
}
void set_allocation_identity_hash(uint32_t hash) {
allocation_identity_hash_ = hash;
}
bool IsAllocationSample() const { return allocation_cid_ > 0; }
// Was the stack trace truncated?
bool truncated() const { return truncated_; }
void set_truncated(bool truncated) { truncated_ = truncated; }
// Was the first frame in the stack trace executing?
bool first_frame_executing() const { return first_frame_executing_; }
void set_first_frame_executing(bool first_frame_executing) {
first_frame_executing_ = first_frame_executing;
}
private:
void FixupCaller(const CodeLookupTable& clt,
uword pc_marker,
uword* stack_buffer);
void CheckForMissingDartFrame(const CodeLookupTable& clt,
const CodeDescriptor* code,
uword pc_marker,
uword* stack_buffer);
ZoneGrowableArray<uword> pcs_;
int64_t timestamp_;
ThreadId tid_;
uword vm_tag_;
uword user_tag_;
intptr_t allocation_cid_;
uint32_t allocation_identity_hash_;
bool truncated_;
bool first_frame_executing_;
friend class SampleBuffer;
DISALLOW_COPY_AND_ASSIGN(ProcessedSample);
};
// A collection of |ProcessedSample|s.
class ProcessedSampleBuffer : public ZoneAllocated {
public:
ProcessedSampleBuffer();
void Add(ProcessedSample* sample) { samples_.Add(sample); }
intptr_t length() const { return samples_.length(); }
ProcessedSample* At(intptr_t index) { return samples_.At(index); }
const CodeLookupTable& code_lookup_table() const {
return *code_lookup_table_;
}
private:
ZoneGrowableArray<ProcessedSample*> samples_;
CodeLookupTable* code_lookup_table_;
DISALLOW_COPY_AND_ASSIGN(ProcessedSampleBuffer);
};
class SampleBlockProcessor : public AllStatic {
public:
static void Init();
static void Startup();
static void Cleanup();
private:
static constexpr intptr_t kMaxThreads = 4096;
static bool initialized_;
static bool shutdown_;
static bool thread_running_;
static ThreadJoinId processor_thread_id_;
static Monitor* monitor_;
static void ThreadMain(uword parameters);
};
} // namespace dart
#endif // RUNTIME_VM_PROFILER_H_