Changeset 189596 in webkit for trunk/Source/JavaScriptCore/ChangeLog

Timestamp:

Sep 10, 2015, 4:07:08 PM (10 years ago)

Author:

[email protected]

Message:

Structure should be able to tell you if it had ever been a dictionary
​https://bugs.webkit.org/show_bug.cgi?id=149047

Reviewed by Mark Lam.

Introduces the hasBeenDictionary flag to Structure, which tells you if this structure or
any of its ancestors is a dictionary. We already implicitly tracked this for DFG
watchpoint optimizations, so this is mainly just decoupling that existing logic from
watchpoints. Having Structure::hasBeenDictionary() enables some of the heuristics in the
property type inference work (​https://bugs.webkit.org/show_bug.cgi?id=148610).

• runtime/Structure.cpp:

(JSC::Structure::Structure):
(JSC::Structure::toDictionaryTransition):
(JSC::Structure::dump):

• runtime/Structure.h:

File:

• trunk/Source/JavaScriptCore/ChangeLog (modified) (1 diff)

trunk/Source/JavaScriptCore/ChangeLog

@@ +1 @@
+2015-09-10  Filip Pizlo  <[email protected]>
+
+        Structure should be able to tell you if it had ever been a dictionary
+        https://bugs.webkit.org/show_bug.cgi?id=149047
+
+        Reviewed by Mark Lam.
+
+        Introduces the hasBeenDictionary flag to Structure, which tells you if this structure or
+        any of its ancestors is a dictionary. We already implicitly tracked this for DFG
+        watchpoint optimizations, so this is mainly just decoupling that existing logic from
+        watchpoints. Having Structure::hasBeenDictionary() enables some of the heuristics in the
+        property type inference work (https://bugs.webkit.org/show_bug.cgi?id=148610).
+
+        * runtime/Structure.cpp:
+        (JSC::Structure::Structure):
+        (JSC::Structure::toDictionaryTransition):
+        (JSC::Structure::dump):
+        * runtime/Structure.h:
+
 2015-09-10  Yusuke Suzuki  <[email protected]>