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node_v8.cc
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#include "node.h"
#include "env.h"
#include "env-inl.h"
#include "util.h"
#include "util-inl.h"
#include "v8.h"
namespace node {
using v8::Array;
using v8::ArrayBuffer;
using v8::Context;
using v8::Function;
using v8::FunctionCallbackInfo;
using v8::HeapSpaceStatistics;
using v8::HeapStatistics;
using v8::Isolate;
using v8::Local;
using v8::NewStringType;
using v8::Object;
using v8::String;
using v8::Uint32;
using v8::Uint32Array;
using v8::V8;
using v8::Value;
#define HEAP_STATISTICS_PROPERTIES(V) \
V(0, total_heap_size, kTotalHeapSizeIndex) \
V(1, total_heap_size_executable, kTotalHeapSizeExecutableIndex) \
V(2, total_physical_size, kTotalPhysicalSizeIndex) \
V(3, total_available_size, kTotalAvailableSize) \
V(4, used_heap_size, kUsedHeapSizeIndex) \
V(5, heap_size_limit, kHeapSizeLimitIndex)
#define V(a, b, c) +1
static const size_t kHeapStatisticsPropertiesCount =
HEAP_STATISTICS_PROPERTIES(V);
#undef V
#define HEAP_SPACE_STATISTICS_PROPERTIES(V) \
V(0, space_size, kSpaceSizeIndex) \
V(1, space_used_size, kSpaceUsedSizeIndex) \
V(2, space_available_size, kSpaceAvailableSizeIndex) \
V(3, physical_space_size, kPhysicalSpaceSizeIndex)
#define V(a, b, c) +1
static const size_t kHeapSpaceStatisticsPropertiesCount =
HEAP_SPACE_STATISTICS_PROPERTIES(V);
#undef V
// Will be populated in InitializeV8Bindings.
static size_t number_of_heap_spaces = 0;
void UpdateHeapStatisticsArrayBuffer(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
HeapStatistics s;
env->isolate()->GetHeapStatistics(&s);
double* const buffer = env->heap_statistics_buffer();
#define V(index, name, _) buffer[index] = static_cast<double>(s.name());
HEAP_STATISTICS_PROPERTIES(V)
#undef V
}
void UpdateHeapSpaceStatisticsBuffer(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
HeapSpaceStatistics s;
Isolate* const isolate = env->isolate();
double* buffer = env->heap_space_statistics_buffer();
for (size_t i = 0; i < number_of_heap_spaces; i++) {
isolate->GetHeapSpaceStatistics(&s, i);
size_t const property_offset = i * kHeapSpaceStatisticsPropertiesCount;
#define V(index, name, _) buffer[property_offset + index] = \
static_cast<double>(s.name());
HEAP_SPACE_STATISTICS_PROPERTIES(V)
#undef V
}
}
void SetFlagsFromString(const FunctionCallbackInfo<Value>& args) {
Environment* env = Environment::GetCurrent(args);
if (args.Length() < 1)
return env->ThrowTypeError("v8 flag is required");
if (!args[0]->IsString())
return env->ThrowTypeError("v8 flag must be a string");
String::Utf8Value flags(args[0]);
V8::SetFlagsFromString(*flags, flags.length());
}
void InitializeV8Bindings(Local<Object> target,
Local<Value> unused,
Local<Context> context) {
Environment* env = Environment::GetCurrent(context);
env->SetMethod(target,
"updateHeapStatisticsArrayBuffer",
UpdateHeapStatisticsArrayBuffer);
env->set_heap_statistics_buffer(new double[kHeapStatisticsPropertiesCount]);
const size_t heap_statistics_buffer_byte_length =
sizeof(*env->heap_statistics_buffer()) * kHeapStatisticsPropertiesCount;
target->Set(FIXED_ONE_BYTE_STRING(env->isolate(),
"heapStatisticsArrayBuffer"),
ArrayBuffer::New(env->isolate(),
env->heap_statistics_buffer(),
heap_statistics_buffer_byte_length));
#define V(i, _, name) \
target->Set(FIXED_ONE_BYTE_STRING(env->isolate(), #name), \
Uint32::NewFromUnsigned(env->isolate(), i));
HEAP_STATISTICS_PROPERTIES(V)
#undef V
target->Set(FIXED_ONE_BYTE_STRING(env->isolate(),
"kHeapSpaceStatisticsPropertiesCount"),
Uint32::NewFromUnsigned(env->isolate(),
kHeapSpaceStatisticsPropertiesCount));
number_of_heap_spaces = env->isolate()->NumberOfHeapSpaces();
// Heap space names are extracted once and exposed to JavaScript to
// avoid excessive creation of heap space name Strings.
HeapSpaceStatistics s;
const Local<Array> heap_spaces = Array::New(env->isolate(),
number_of_heap_spaces);
for (size_t i = 0; i < number_of_heap_spaces; i++) {
env->isolate()->GetHeapSpaceStatistics(&s, i);
Local<String> heap_space_name = String::NewFromUtf8(env->isolate(),
s.space_name(),
NewStringType::kNormal)
.ToLocalChecked();
heap_spaces->Set(i, heap_space_name);
}
target->Set(FIXED_ONE_BYTE_STRING(env->isolate(), "kHeapSpaces"),
heap_spaces);
env->SetMethod(target,
"updateHeapSpaceStatisticsArrayBuffer",
UpdateHeapSpaceStatisticsBuffer);
env->set_heap_space_statistics_buffer(
new double[kHeapSpaceStatisticsPropertiesCount * number_of_heap_spaces]);
const size_t heap_space_statistics_buffer_byte_length =
sizeof(*env->heap_space_statistics_buffer()) *
kHeapSpaceStatisticsPropertiesCount *
number_of_heap_spaces;
target->Set(FIXED_ONE_BYTE_STRING(env->isolate(),
"heapSpaceStatisticsArrayBuffer"),
ArrayBuffer::New(env->isolate(),
env->heap_space_statistics_buffer(),
heap_space_statistics_buffer_byte_length));
#define V(i, _, name) \
target->Set(FIXED_ONE_BYTE_STRING(env->isolate(), #name), \
Uint32::NewFromUnsigned(env->isolate(), i));
HEAP_SPACE_STATISTICS_PROPERTIES(V)
#undef V
env->SetMethod(target, "setFlagsFromString", SetFlagsFromString);
}
} // namespace node
NODE_MODULE_CONTEXT_AWARE_BUILTIN(v8, node::InitializeV8Bindings)