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Bug 609896 - Optimize copy and initialization of DenseElements; r=billm

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--HG--
extra : rebase_source : a0cf2605a7f1277352ff9163379632992c56d09a
This commit is contained in:
Terrence Cole 2013-09-25 15:19:08 -07:00
parent 808f6c29de
commit 50dcb5f560
2 changed files with 13 additions and 7 deletions
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2
js/public/GCAPI.h
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@ -8,7 +8,7 @@
#define js_GCAPI_h
#include "mozilla/NullPtr.h"
#include "js/HeapAPI.h"
#include "js/RootingAPI.h"
#include "js/Value.h"

18
js/src/jsobj.h
View File

@ -19,6 +19,7 @@
#include "mozilla/MemoryReporting.h"
#include "gc/Marking.h"
#include "js/GCAPI.h"
#include "vm/ObjectImpl.h"
#include "vm/Shape.h"
@ -638,16 +639,21 @@ class JSObject : public js::ObjectImpl
void copyDenseElements(uint32_t dstStart, const js::Value *src, uint32_t count) {
JS_ASSERT(dstStart + count <= getDenseCapacity());
JS::Zone *zone = this->zone();
for (uint32_t i = 0; i < count; ++i)
elements[dstStart + i].set(zone, this, js::HeapSlot::Element, dstStart + i, src[i]);
JSRuntime *rt = runtimeFromMainThread();
if (JS::IsIncrementalBarrierNeeded(rt)) {
JS::Zone *zone = this->zone();
for (uint32_t i = 0; i < count; ++i)
elements[dstStart + i].set(zone, this, js::HeapSlot::Element, dstStart + i, src[i]);
} else {
memcpy(&elements[dstStart], src, count * sizeof(js::HeapSlot));
DenseRangeWriteBarrierPost(rt, this, dstStart, count);
}
}
void initDenseElements(uint32_t dstStart, const js::Value *src, uint32_t count) {
JS_ASSERT(dstStart + count <= getDenseCapacity());
JSRuntime *rt = runtimeFromMainThread();
for (uint32_t i = 0; i < count; ++i)
elements[dstStart + i].init(rt, this, js::HeapSlot::Element, dstStart + i, src[i]);
memcpy(&elements[dstStart], src, count * sizeof(js::HeapSlot));
DenseRangeWriteBarrierPost(runtimeFromMainThread(), this, dstStart, count);
}
void moveDenseElements(uint32_t dstStart, uint32_t srcStart, uint32_t count) {