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src: add v8.getHeapStatistics() function

Add a one-to-one binding to v8::GetHeapStatistics().  Returns info on
the current state of the JS heap, like total size and amount used.
v0.11.12-release
Ben Noordhuis 11 years ago
committed by Timothy J Fontaine
parent
commit
d23ac0ea9c
  1. 3
      lib/tracing.js
  2. 24
      src/node_v8.cc
  3. 36
      test/simple/test-v8-stats.js

3
lib/tracing.js

@ -42,3 +42,6 @@ v8.on('removeListener', function(name) {
binding.stopGarbageCollectionTracking();
}
});
v8.getHeapStatistics = binding.getHeapStatistics;

24
src/node_v8.cc

@ -35,6 +35,7 @@ using v8::GCCallbackFlags;
using v8::GCType;
using v8::Handle;
using v8::HandleScope;
using v8::HeapStatistics;
using v8::Isolate;
using v8::Local;
using v8::Null;
@ -178,6 +179,28 @@ void StartGarbageCollectionTracking(const FunctionCallbackInfo<Value>& args) {
}
void GetHeapStatistics(const FunctionCallbackInfo<Value>& args) {
Isolate* isolate = args.GetIsolate();
HandleScope handle_scope(isolate);
Environment* env = Environment::GetCurrent(isolate);
HeapStatistics s;
isolate->GetHeapStatistics(&s);
Local<Object> info = Object::New();
// TODO(trevnorris): Setting many object properties in C++ is a significant
// performance hit. Redo this to pass the results to JS and create/set the
// properties there.
#define V(name) \
info->Set(env->name ## _string(), Uint32::NewFromUnsigned(s.name(), isolate))
V(total_heap_size);
V(total_heap_size_executable);
V(total_physical_size);
V(used_heap_size);
V(heap_size_limit);
#undef V
args.GetReturnValue().Set(info);
}
void StopGarbageCollectionTracking(const FunctionCallbackInfo<Value>& args) {
HandleScope handle_scope(args.GetIsolate());
Environment::GetCurrent(args.GetIsolate())->StopGarbageCollectionTracking();
@ -193,6 +216,7 @@ void InitializeV8Bindings(Handle<Object> target,
NODE_SET_METHOD(target,
"stopGarbageCollectionTracking",
StopGarbageCollectionTracking);
NODE_SET_METHOD(target, "getHeapStatistics", GetHeapStatistics);
}
} // namespace node

36
test/simple/test-v8-stats.js

@ -0,0 +1,36 @@
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
var common = require('../common');
var assert = require('assert');
var v8 = require('tracing').v8;
var s = v8.getHeapStatistics();
var keys = [
'heap_size_limit',
'total_heap_size',
'total_heap_size_executable',
'total_physical_size',
'used_heap_size'];
assert.deepEqual(Object.keys(s).sort(), keys);
keys.forEach(function(key) {
assert.equal(typeof s[key], 'number');
});
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