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Patch by Vitaly Repeshko. Improve performance of internal fields

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operations by adding a fast-case check for JS_OBJECT_TYPE in
JSObject::GetHeaderSize().
Review URL: http://codereview.chromium.org/155684

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@2497 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
This commit is contained in:
kasperl@chromium.org 2009-07-17 09:16:23 +00:00
parent f8e622a620
commit 4f2cc4104e
1 changed files with 6 additions and 2 deletions
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8
src/objects-inl.h
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@ -1075,7 +1075,12 @@ void JSGlobalPropertyCell::set_value(Object* val, WriteBarrierMode ignored) {
int JSObject::GetHeaderSize() {
switch (map()->instance_type()) {
InstanceType type = map()->instance_type();
// Check for the most common kind of JavaScript object before
// falling into the generic switch. This speeds up the internal
// field operations considerably on average.
if (type == JS_OBJECT_TYPE) return JSObject::kHeaderSize;
switch (type) {
case JS_GLOBAL_PROXY_TYPE:
return JSGlobalProxy::kSize;
case JS_GLOBAL_OBJECT_TYPE:
@ -1090,7 +1095,6 @@ int JSObject::GetHeaderSize() {
return JSValue::kSize;
case JS_REGEXP_TYPE:
return JSValue::kSize;
case JS_OBJECT_TYPE:
case JS_CONTEXT_EXTENSION_OBJECT_TYPE:
return JSObject::kHeaderSize;
default: