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// Copyright 2016 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/ic/ic-stats.h"
#include "src/flags.h"
#include "src/objects-inl.h"
#include "src/tracing/trace-event.h"
#include "src/tracing/traced-value.h"
#include "src/v8.h"
namespace v8 {
namespace internal {
base::LazyInstance<ICStats>::type ICStats::instance_ =
LAZY_INSTANCE_INITIALIZER;
ICStats::ICStats() : ic_infos_(MAX_IC_INFO), pos_(0) {
base::Relaxed_Store(&enabled_, 0);
}
void ICStats::Begin() {
if (V8_LIKELY(!FLAG_ic_stats)) return;
base::Relaxed_Store(&enabled_, 1);
}
void ICStats::End() {
if (base::Relaxed_Load(&enabled_) != 1) return;
++pos_;
if (pos_ == MAX_IC_INFO) {
Dump();
}
base::Relaxed_Store(&enabled_, 0);
}
void ICStats::Reset() {
for (auto ic_info : ic_infos_) {
ic_info.Reset();
}
pos_ = 0;
}
void ICStats::Dump() {
auto value = v8::tracing::TracedValue::Create();
value->BeginArray("data");
for (int i = 0; i < pos_; ++i) {
ic_infos_[i].AppendToTracedValue(value.get());
}
value->EndArray();
TRACE_EVENT_INSTANT1(TRACE_DISABLED_BY_DEFAULT("v8.ic_stats"), "V8.ICStats",
TRACE_EVENT_SCOPE_THREAD, "ic-stats", std::move(value));
Reset();
}
const char* ICStats::GetOrCacheScriptName(Script* script) {
if (script_name_map_.find(script) != script_name_map_.end()) {
return script_name_map_[script].get();
}
Object* script_name_raw = script->name();
if (script_name_raw->IsString()) {
String* script_name = String::cast(script_name_raw);
char* c_script_name =
script_name->ToCString(DISALLOW_NULLS, ROBUST_STRING_TRAVERSAL)
.release();
script_name_map_.insert(
std::make_pair(script, std::unique_ptr<char[]>(c_script_name)));
return c_script_name;
} else {
script_name_map_.insert(
std::make_pair(script, std::unique_ptr<char[]>(nullptr)));
return nullptr;
}
return nullptr;
}
const char* ICStats::GetOrCacheFunctionName(JSFunction* function) {
if (function_name_map_.find(function) != function_name_map_.end()) {
return function_name_map_[function].get();
}
SharedFunctionInfo* shared = function->shared();
ic_infos_[pos_].is_optimized = function->IsOptimized();
char* function_name = shared->DebugName()->ToCString().release();
function_name_map_.insert(
std::make_pair(function, std::unique_ptr<char[]>(function_name)));
return function_name;
}
ICInfo::ICInfo()
: function_name(nullptr),
script_offset(0),
script_name(nullptr),
line_num(-1),
is_constructor(false),
is_optimized(false),
map(nullptr),
is_dictionary_map(0),
number_of_own_descriptors(0) {}
void ICInfo::Reset() {
type.clear();
function_name = nullptr;
script_offset = 0;
script_name = nullptr;
line_num = -1;
is_constructor = false;
is_optimized = false;
state.clear();
map = nullptr;
is_dictionary_map = false;
number_of_own_descriptors = 0;
instance_type.clear();
}
void ICInfo::AppendToTracedValue(v8::tracing::TracedValue* value) const {
value->BeginDictionary();
value->SetString("type", type);
if (function_name) {
value->SetString("functionName", function_name);
if (is_optimized) {
value->SetInteger("optimized", is_optimized);
}
}
if (script_offset) value->SetInteger("offset", script_offset);
if (script_name) value->SetString("scriptName", script_name);
if (line_num != -1) value->SetInteger("lineNum", line_num);
if (is_constructor) value->SetInteger("constructor", is_constructor);
if (!state.empty()) value->SetString("state", state);
if (map) {
// V8 cannot represent integer above 2^53 - 1 in JavaScript from JSON,
// thus `map` should be converted to a string rather than an integer.
std::stringstream ss;
ss << map;
value->SetString("map", ss.str());
}
if (map) value->SetInteger("dict", is_dictionary_map);
if (map) value->SetInteger("own", number_of_own_descriptors);
if (!instance_type.empty()) value->SetString("instanceType", instance_type);
value->EndDictionary();
}
} // namespace internal
} // namespace v8
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