diff options
Diffstat (limited to 'Source/JavaScriptCore/dfg/DFGByteCodeParser.cpp')
| -rw-r--r-- | Source/JavaScriptCore/dfg/DFGByteCodeParser.cpp | 30 |
1 files changed, 24 insertions, 6 deletions
diff --git a/Source/JavaScriptCore/dfg/DFGByteCodeParser.cpp b/Source/JavaScriptCore/dfg/DFGByteCodeParser.cpp index 27e198c75..43157963c 100644 --- a/Source/JavaScriptCore/dfg/DFGByteCodeParser.cpp +++ b/Source/JavaScriptCore/dfg/DFGByteCodeParser.cpp @@ -350,8 +350,9 @@ private: stack->m_argumentPositions[argument]->addVariable(variableAccessData); NodeIndex nodeIndex = addToGraph(SetLocal, OpInfo(variableAccessData), value); m_currentBlock->variablesAtTail.argument(argument) = nodeIndex; - // Always flush arguments. - addToGraph(Flush, OpInfo(variableAccessData), nodeIndex); + // Always flush arguments, except for 'this'. + if (argument) + addToGraph(Flush, OpInfo(variableAccessData), nodeIndex); } VariableAccessData* flushArgument(int operand) @@ -1582,10 +1583,27 @@ bool ByteCodeParser::parseBlock(unsigned limit) case op_convert_this: { NodeIndex op1 = getThis(); - if (m_graph[op1].op() == ConvertThis) - setThis(op1); - else - setThis(addToGraph(ConvertThis, op1)); + if (m_graph[op1].op() != ConvertThis) { + ValueProfile* profile = + m_inlineStackTop->m_profiledBlock->valueProfileForBytecodeOffset(m_currentProfilingIndex); + profile->computeUpdatedPrediction(); +#if DFG_ENABLE(DEBUG_VERBOSE) + dataLog("[@%lu bc#%u]: profile %p: ", m_graph.size(), m_currentProfilingIndex, profile); + profile->dump(WTF::dataFile()); + dataLog("\n"); +#endif + if (profile->m_singletonValueIsTop + || !profile->m_singletonValue + || !profile->m_singletonValue.isCell() + || profile->m_singletonValue.asCell()->classInfo() != &Structure::s_info) + setThis(addToGraph(ConvertThis, op1)); + else { + addToGraph( + CheckStructure, + OpInfo(m_graph.addStructureSet(jsCast<Structure*>(profile->m_singletonValue.asCell()))), + op1); + } + } NEXT_OPCODE(op_convert_this); } |