Changeset 178693 in webkit for trunk/Source/JavaScriptCore/bytecode/CodeBlock.h

Timestamp:

Jan 19, 2015, 9:01:26 PM (10 years ago)

Author:

[email protected]

Message:

ClosureCallStubRoutine no longer needs codeOrigin
​https://bugs.webkit.org/show_bug.cgi?id=140659

Reviewed by Michael Saboff.

Once upon a time, we would look for the CodeOrigin associated with a return PC. This search
would start with the CodeBlock according to the caller frame's call frame header. But if the
call was a closure call, the return PC would be inside some closure call stub. So if the
CodeBlock search failed, we would search *all* closure call stub routines to see which one
encompasses the return PC. Then, we would use the CodeOrigin stored in the stub routine
object. This was all a bunch of madness, and we actually got rid of it - we now determine
the CodeOrigin for a call frame using the encoded code origin bits inside the tag of the
argument count.

This patch removes the final vestiges of the madness:

• Remove the totally unused method declaration for the thing that did the closure call stub search.

• Remove the CodeOrigin field from the ClosureCallStubRoutine. Except for that crazy search that we no longer do, everyone else who finds a ClosureCallStubRoutine will find it via the CallLinkInfo. The CallLinkInfo also has the CodeOrigin, so we don't need this field anymore.

• bytecode/CodeBlock.h:
• jit/ClosureCallStubRoutine.cpp:

(JSC::ClosureCallStubRoutine::ClosureCallStubRoutine):

• jit/ClosureCallStubRoutine.h:

(JSC::ClosureCallStubRoutine::executable):
(JSC::ClosureCallStubRoutine::codeOrigin): Deleted.

• jit/Repatch.cpp:

(JSC::linkClosureCall):

File:

• trunk/Source/JavaScriptCore/bytecode/CodeBlock.h (modified) (2 diffs)

trunk/Source/JavaScriptCore/bytecode/CodeBlock.h

@@ -1 +1 @@
 /*
- * Copyright (C) 2008, 2009, 2010, 2011, 2012, 2013, 2014 Apple Inc. All rights reserved.
+ * Copyright (C) 2008-2015 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Cameron Zwarich <[email protected]>
  *
@@ -988 +988 @@
     double optimizationThresholdScalingFactor();
 
-#if ENABLE(JIT)
-    ClosureCallStubRoutine* findClosureCallForReturnPC(ReturnAddressPtr);
-#endif
-        
     void updateAllPredictionsAndCountLiveness(unsigned& numberOfLiveNonArgumentValueProfiles, unsigned& numberOfSamplesInProfiles);