Changeset 55599 in webkit for trunk/JavaScriptCore/runtime/Identifier.cpp

Timestamp:

Mar 5, 2010, 3:29:13 PM (15 years ago)

Author:

[email protected]

Message:

2010-03-05 Oliver Hunt <​[email protected]>

Reviewed by Gavin Barraclough.

JSC should cache int to Identifier conversion as it does for ordinary strings
​https://bugs.webkit.org/show_bug.cgi?id=35814

Make the NumericStrings cache cache unsigned ints in addition to signed.
We keep them separate from the int cache as it both simplifies code, and
also because the unsigned path is exclusive to property access and therefore
seems to have different usage patterns.

The primary trigger for the unsigned to Identifier propertyName conversion
is the construction of array-like objects out of normal objects. Given these
tend to be relative small numbers, and the array-like behaviour lends itself
to sequential values this patch also adds a non-colliding cache for all small
numbers.

• JavaScriptCore.exp:
• runtime/Identifier.cpp: (JSC::Identifier::from):
• runtime/Identifier.h:
• runtime/NumericStrings.h: (JSC::NumericStrings::add): (JSC::NumericStrings::lookup): (JSC::NumericStrings::lookupSmallString):

File:

• trunk/JavaScriptCore/runtime/Identifier.cpp (modified) (2 diffs)

trunk/JavaScriptCore/runtime/Identifier.cpp

@@ -23 +23 @@
 
 #include "CallFrame.h"
+#include "NumericStrings.h"
 #include <new> // for placement new
 #include <string.h> // for strlen
@@ -237 +238 @@
     currentIdentifierTable()->remove(r);
 }
+    
+Identifier Identifier::from(ExecState* exec, unsigned value)
+{
+    return Identifier(exec, exec->globalData().numericStrings.add(value));
+}
+
+Identifier Identifier::from(ExecState* exec, int value)
+{
+    return Identifier(exec, exec->globalData().numericStrings.add(value));
+}
+
+Identifier Identifier::from(ExecState* exec, double value)
+{
+    return Identifier(exec, exec->globalData().numericStrings.add(value));
+}
 
 #ifndef NDEBUG