Changeset 121215 in webkit for trunk/Source/JavaScriptCore/bytecode/ExecutionCounter.h

Timestamp:

Jun 25, 2012, 7:14:07 PM (13 years ago)

Author:

[email protected]

Message:

Value profiling should use tier-up threshold randomization to get more coverage
​https://bugs.webkit.org/show_bug.cgi?id=89802

Source/JavaScriptCore:

Reviewed by Gavin Barraclough.

This patch causes both LLInt and Baseline JIT code to take the OSR slow path several
times before actually doing OSR. If we take the OSR slow path before the execution
count threshold is reached, then we just call CodeBlock::updateAllPredictions() to
compute the current latest least-upper-bound SpecType of all values seen in each
ValueProfile.

• bytecode/CodeBlock.cpp:

(JSC::CodeBlock::stronglyVisitStrongReferences):
(JSC::CodeBlock::updateAllPredictionsAndCountLiveness):
(JSC):
(JSC::CodeBlock::updateAllPredictions):
(JSC::CodeBlock::shouldOptimizeNow):

• bytecode/CodeBlock.h:

(JSC::CodeBlock::llintExecuteCounter):
(JSC::CodeBlock::jitExecuteCounter):
(CodeBlock):
(JSC::CodeBlock::updateAllPredictions):

• bytecode/ExecutionCounter.cpp:

(JSC::ExecutionCounter::setThreshold):
(JSC::ExecutionCounter::status):
(JSC):

• bytecode/ExecutionCounter.h:

(JSC::ExecutionCounter::count):
(ExecutionCounter):

• dfg/DFGAbstractState.cpp:

(JSC::DFG::AbstractState::execute):

• dfg/DFGOperations.cpp:
• dfg/DFGSpeculativeJIT.cpp:

(JSC::DFG::SpeculativeJIT::compile):

• jit/JITStubs.cpp:

(JSC::DEFINE_STUB_FUNCTION):

• llint/LLIntSlowPaths.cpp:

(JSC::LLInt::jitCompileAndSetHeuristics):
(JSC::LLInt::entryOSR):
(JSC::LLInt::LLINT_SLOW_PATH_DECL):

• runtime/JSGlobalObject.cpp:

(JSC::JSGlobalObject::JSGlobalObject):
(JSC):

• runtime/JSGlobalObject.h:

(JSGlobalObject):
(JSC::JSGlobalObject::weakRandomInteger):

• runtime/Options.cpp:

(Options):
(JSC::Options::initializeOptions):

• runtime/Options.h:

(Options):

• runtime/WeakRandom.h:

(WeakRandom):
(JSC::WeakRandom::seedUnsafe):

LayoutTests:

Reviewed by Gavin Barraclough.

• fast/js/dfg-store-unexpected-value-into-argument-and-osr-exit-expected.txt: Added.
• fast/js/dfg-store-unexpected-value-into-argument-and-osr-exit.html: Added.
• fast/js/script-tests/dfg-store-unexpected-value-into-argument-and-osr-exit.js: Added.

(foo):

File:

• trunk/Source/JavaScriptCore/bytecode/ExecutionCounter.h (modified) (1 diff)

trunk/Source/JavaScriptCore/bytecode/ExecutionCounter.h

@@ -39 +39 @@
     void setNewThreshold(int32_t threshold, CodeBlock*);
     void deferIndefinitely();
+    double count() const { return static_cast<double>(m_totalCount) + m_counter; }
+    const char* status() const;
     static double applyMemoryUsageHeuristics(int32_t value, CodeBlock*);
     static int32_t applyMemoryUsageHeuristicsAndConvertToInt(int32_t value, CodeBlock*);