Changeset 174789 in webkit for trunk/Source/JavaScriptCore/heap/Heap.cpp

Timestamp:

Oct 16, 2014, 12:55:14 PM (11 years ago)

Author:

[email protected]

Message:

Have the ProfileType node in the DFG convert to a structure check where it can
​https://bugs.webkit.org/show_bug.cgi?id=137596

Reviewed by Filip Pizlo.

TypeSet now keeps track of the live set of Structures it has seen.
It no longer nukes everything during GC. It now only removes unmarked
structures during GC. This modification allows the ProfileType node
to convert into a CheckStructure node safely in the DFG.

This change brings up the conversion rate from ProfileType to Check
or CheckStructrue from ~45% to ~65%. This change also speeds the
type profiler up significantly: consistently between 2x-20x faster.

This patch also does some slight refactoring: a few type profiler
related fields are moved from VM to TypeProfiler.

• bytecode/CodeBlock.cpp:

(JSC::CodeBlock::CodeBlock):

• dfg/DFGFixupPhase.cpp:

(JSC::DFG::FixupPhase::fixupNode):

• dfg/DFGNode.h:

(JSC::DFG::Node::convertToCheckStructure):

• heap/Heap.cpp:

(JSC::Heap::collect):

• runtime/SymbolTable.cpp:

(JSC::SymbolTable::uniqueIDForVariable):

• runtime/SymbolTable.h:
• runtime/TypeLocationCache.cpp:

(JSC::TypeLocationCache::getTypeLocation):

• runtime/TypeProfiler.cpp:

(JSC::TypeProfiler::TypeProfiler):
(JSC::TypeProfiler::nextTypeLocation):
(JSC::TypeProfiler::invalidateTypeSetCache):
(JSC::TypeProfiler::dumpTypeProfilerData):

• runtime/TypeProfiler.h:

(JSC::TypeProfiler::getNextUniqueVariableID):

• runtime/TypeProfilerLog.cpp:

(JSC::TypeProfilerLog::processLogEntries):

• runtime/TypeSet.cpp:

(JSC::TypeSet::addTypeInformation):
(JSC::TypeSet::invalidateCache):

• runtime/TypeSet.h:

(JSC::TypeSet::structureSet):

• runtime/VM.cpp:

(JSC::VM::VM):
(JSC::VM::enableTypeProfiler):
(JSC::VM::disableTypeProfiler):
(JSC::VM::dumpTypeProfilerData):
(JSC::VM::nextTypeLocation): Deleted.
(JSC::VM::invalidateTypeSetCache): Deleted.

• runtime/VM.h:

(JSC::VM::typeProfiler):
(JSC::VM::getNextUniqueVariableID): Deleted.

• tests/typeProfiler/dfg-jit-optimizations.js:

File:

• trunk/Source/JavaScriptCore/heap/Heap.cpp (modified) (2 diffs)

trunk/Source/JavaScriptCore/heap/Heap.cpp

@@ -983 +983 @@
         DeferGCForAWhile awhile(*this);
         vm()->typeProfilerLog()->processLogEntries(ASCIILiteral("GC"));
-        vm()->invalidateTypeSetCache();
     }
     
@@ -1012 +1011 @@
 
     JAVASCRIPTCORE_GC_MARKED();
+
+    if (vm()->typeProfiler())
+        vm()->typeProfiler()->invalidateTypeSetCache();
 
     reapWeakHandles();