#if USE(JSVALUE64)
#include "JIT.h"
+#include "Arguments.h"
#include "CodeBlock.h"
#include "JITInlineMethods.h"
#include "JITStubCall.h"
namespace JSC {
-void JIT::compileOpCallInitializeCallFrame()
-{
- // regT0 holds callee, regT1 holds argCount
- loadPtr(Address(regT0, OBJECT_OFFSETOF(JSFunction, m_scopeChain)), regT3); // scopeChain
- emitPutIntToCallFrameHeader(regT1, RegisterFile::ArgumentCount);
- emitPutCellToCallFrameHeader(regT0, RegisterFile::Callee);
- emitPutCellToCallFrameHeader(regT3, RegisterFile::ScopeChain);
-}
-
void JIT::emit_op_call_put_result(Instruction* instruction)
{
int dst = instruction[1].u.operand;
- emitValueProfilingSite(FirstProfilingSite);
+ emitValueProfilingSite();
emitPutVirtualRegister(dst);
+ if (canBeOptimizedOrInlined())
+ killLastResultRegister(); // Make lastResultRegister tracking simpler in the DFG.
}
-void JIT::compileOpCallVarargs(Instruction* instruction)
+void JIT::compileLoadVarargs(Instruction* instruction)
{
- int callee = instruction[1].u.operand;
- int argCountRegister = instruction[2].u.operand;
- int registerOffset = instruction[3].u.operand;
-
- emitGetVirtualRegister(argCountRegister, regT1);
- emitFastArithImmToInt(regT1);
- emitGetVirtualRegister(callee, regT0);
- addPtr(Imm32(registerOffset), regT1, regT2);
-
- // Check for JSFunctions.
- emitJumpSlowCaseIfNotJSCell(regT0);
- addSlowCase(emitJumpIfNotType(regT0, regT3, JSFunctionType));
-
- // Speculatively roll the callframe, assuming argCount will match the arity.
- mul32(TrustedImm32(sizeof(Register)), regT2, regT2);
- intptr_t offset = (intptr_t)sizeof(Register) * (intptr_t)RegisterFile::CallerFrame;
- addPtr(Imm32((int32_t)offset), regT2, regT3);
- addPtr(callFrameRegister, regT3);
- storePtr(callFrameRegister, regT3);
- addPtr(regT2, callFrameRegister);
- emitNakedCall(m_globalData->jitStubs->ctiVirtualCall());
+ int thisValue = instruction[2].u.operand;
+ int arguments = instruction[3].u.operand;
+ int firstFreeRegister = instruction[4].u.operand;
+
+ killLastResultRegister();
+
+ JumpList slowCase;
+ JumpList end;
+ if (m_codeBlock->usesArguments() && arguments == m_codeBlock->argumentsRegister()) {
+ emitGetVirtualRegister(arguments, regT0);
+ slowCase.append(branchPtr(NotEqual, regT0, TrustedImmPtr(JSValue::encode(JSValue()))));
+
+ emitGetFromCallFrameHeader32(RegisterFile::ArgumentCount, regT0);
+ slowCase.append(branch32(Above, regT0, TrustedImm32(Arguments::MaxArguments + 1)));
+ // regT0: argumentCountIncludingThis
+
+ move(regT0, regT1);
+ add32(TrustedImm32(firstFreeRegister + RegisterFile::CallFrameHeaderSize), regT1);
+ lshift32(TrustedImm32(3), regT1);
+ addPtr(callFrameRegister, regT1);
+ // regT1: newCallFrame
+
+ slowCase.append(branchPtr(Below, AbsoluteAddress(m_globalData->interpreter->registerFile().addressOfEnd()), regT1));
+
+ // Initialize ArgumentCount.
+ store32(regT0, Address(regT1, RegisterFile::ArgumentCount * static_cast<int>(sizeof(Register)) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.payload)));
+
+ // Initialize 'this'.
+ emitGetVirtualRegister(thisValue, regT2);
+ storePtr(regT2, Address(regT1, CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register))));
+
+ // Copy arguments.
+ neg32(regT0);
+ signExtend32ToPtr(regT0, regT0);
+ end.append(branchAddPtr(Zero, TrustedImm32(1), regT0));
+ // regT0: -argumentCount
+
+ Label copyLoop = label();
+ loadPtr(BaseIndex(callFrameRegister, regT0, TimesEight, CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register))), regT2);
+ storePtr(regT2, BaseIndex(regT1, regT0, TimesEight, CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register))));
+ branchAddPtr(NonZero, TrustedImm32(1), regT0).linkTo(copyLoop, this);
+
+ end.append(jump());
+ }
+
+ if (m_codeBlock->usesArguments() && arguments == m_codeBlock->argumentsRegister())
+ slowCase.link(this);
+
+ JITStubCall stubCall(this, cti_op_load_varargs);
+ stubCall.addArgument(thisValue, regT0);
+ stubCall.addArgument(arguments, regT0);
+ stubCall.addArgument(Imm32(firstFreeRegister));
+ stubCall.call(regT1);
+
+ if (m_codeBlock->usesArguments() && arguments == m_codeBlock->argumentsRegister())
+ end.link(this);
+}
+
+void JIT::compileCallEval()
+{
+ JITStubCall stubCall(this, cti_op_call_eval); // Initializes ScopeChain; ReturnPC; CodeBlock.
+ stubCall.call();
+ addSlowCase(branchPtr(Equal, regT0, TrustedImmPtr(JSValue::encode(JSValue()))));
+ emitGetFromCallFrameHeaderPtr(RegisterFile::CallerFrame, callFrameRegister);
sampleCodeBlock(m_codeBlock);
}
-void JIT::compileOpCallVarargsSlowCase(Instruction*, Vector<SlowCaseEntry>::iterator& iter)
+void JIT::compileCallEvalSlowCase(Vector<SlowCaseEntry>::iterator& iter)
{
linkSlowCase(iter);
- linkSlowCase(iter);
- JITStubCall stubCall(this, cti_op_call_NotJSFunction);
- stubCall.addArgument(regT0);
- stubCall.addArgument(regT2);
- stubCall.addArgument(regT1);
- stubCall.call();
-
+ emitGetFromCallFrameHeaderPtr(RegisterFile::Callee, regT0);
+ emitNakedCall(m_globalData->jitStubs->ctiVirtualCall());
+
sampleCodeBlock(m_codeBlock);
}
-
+
void JIT::compileOpCall(OpcodeID opcodeID, Instruction* instruction, unsigned callLinkInfoIndex)
{
int callee = instruction[1].u.operand;
- int argCount = instruction[2].u.operand;
- int registerOffset = instruction[3].u.operand;
- // Handle eval
- Jump wasEval;
+ /* Caller always:
+ - Updates callFrameRegister to callee callFrame.
+ - Initializes ArgumentCount; CallerFrame; Callee.
+
+ For a JS call:
+ - Caller initializes ScopeChain.
+ - Callee initializes ReturnPC; CodeBlock.
+ - Callee restores callFrameRegister before return.
+
+ For a non-JS call:
+ - Caller initializes ScopeChain; ReturnPC; CodeBlock.
+ - Caller restores callFrameRegister after return.
+ */
+
+ if (opcodeID == op_call_varargs)
+ compileLoadVarargs(instruction);
+ else {
+ int argCount = instruction[2].u.operand;
+ int registerOffset = instruction[3].u.operand;
+
+ addPtr(TrustedImm32(registerOffset * sizeof(Register)), callFrameRegister, regT1);
+ store32(TrustedImm32(argCount), Address(regT1, RegisterFile::ArgumentCount * static_cast<int>(sizeof(Register)) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.payload)));
+ } // regT1 holds newCallFrame with ArgumentCount initialized.
+
+ store32(TrustedImm32(instruction - m_codeBlock->instructions().begin()), Address(callFrameRegister, RegisterFile::ArgumentCount * static_cast<int>(sizeof(Register)) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.tag)));
+ emitGetVirtualRegister(callee, regT0); // regT0 holds callee.
+
+ storePtr(callFrameRegister, Address(regT1, RegisterFile::CallerFrame * static_cast<int>(sizeof(Register))));
+ storePtr(regT0, Address(regT1, RegisterFile::Callee * static_cast<int>(sizeof(Register))));
+ move(regT1, callFrameRegister);
+
if (opcodeID == op_call_eval) {
- JITStubCall stubCall(this, cti_op_call_eval);
- stubCall.addArgument(callee, regT0);
- stubCall.addArgument(JIT::Imm32(registerOffset));
- stubCall.addArgument(JIT::Imm32(argCount));
- stubCall.call();
- wasEval = branchPtr(NotEqual, regT0, TrustedImmPtr(JSValue::encode(JSValue())));
+ compileCallEval();
+ return;
}
- // This plants a check for a cached JSFunction value, so we can plant a fast link to the callee.
- // This deliberately leaves the callee in ecx, used when setting up the stack frame below
- emitGetVirtualRegister(callee, regT0);
DataLabelPtr addressOfLinkedFunctionCheck;
-
BEGIN_UNINTERRUPTED_SEQUENCE(sequenceOpCall);
-
- Jump jumpToSlow = branchPtrWithPatch(NotEqual, regT0, addressOfLinkedFunctionCheck, TrustedImmPtr(JSValue::encode(JSValue())));
-
+ Jump slowCase = branchPtrWithPatch(NotEqual, regT0, addressOfLinkedFunctionCheck, TrustedImmPtr(JSValue::encode(JSValue())));
END_UNINTERRUPTED_SEQUENCE(sequenceOpCall);
+ addSlowCase(slowCase);
- addSlowCase(jumpToSlow);
- ASSERT_JIT_OFFSET(differenceBetween(addressOfLinkedFunctionCheck, jumpToSlow), patchOffsetOpCallCompareToJump);
-
ASSERT(m_callStructureStubCompilationInfo.size() == callLinkInfoIndex);
m_callStructureStubCompilationInfo.append(StructureStubCompilationInfo());
m_callStructureStubCompilationInfo[callLinkInfoIndex].hotPathBegin = addressOfLinkedFunctionCheck;
- m_callStructureStubCompilationInfo[callLinkInfoIndex].isCall = opcodeID != op_construct;
+ m_callStructureStubCompilationInfo[callLinkInfoIndex].callType = CallLinkInfo::callTypeFor(opcodeID);
m_callStructureStubCompilationInfo[callLinkInfoIndex].bytecodeIndex = m_bytecodeOffset;
- // The following is the fast case, only used whan a callee can be linked.
-
- // Fast version of stack frame initialization, directly relative to edi.
- // Note that this omits to set up RegisterFile::CodeBlock, which is set in the callee
-
- loadPtr(Address(regT0, OBJECT_OFFSETOF(JSFunction, m_scopeChain)), regT1); // newScopeChain
-
- store32(TrustedImm32(Int32Tag), intTagFor(registerOffset + RegisterFile::ArgumentCount));
- store32(Imm32(argCount), intPayloadFor(registerOffset + RegisterFile::ArgumentCount));
- storePtr(callFrameRegister, Address(callFrameRegister, (registerOffset + RegisterFile::CallerFrame) * static_cast<int>(sizeof(Register))));
- storePtr(regT0, Address(callFrameRegister, (registerOffset + RegisterFile::Callee) * static_cast<int>(sizeof(Register))));
- storePtr(regT1, Address(callFrameRegister, (registerOffset + RegisterFile::ScopeChain) * static_cast<int>(sizeof(Register))));
- addPtr(Imm32(registerOffset * sizeof(Register)), callFrameRegister);
-
- // Call to the callee
+ loadPtr(Address(regT0, OBJECT_OFFSETOF(JSFunction, m_scopeChain)), regT1);
+ emitPutToCallFrameHeader(regT1, RegisterFile::ScopeChain);
m_callStructureStubCompilationInfo[callLinkInfoIndex].hotPathOther = emitNakedCall();
-
- if (opcodeID == op_call_eval)
- wasEval.link(this);
sampleCodeBlock(m_codeBlock);
}
-void JIT::compileOpCallSlowCase(Instruction* instruction, Vector<SlowCaseEntry>::iterator& iter, unsigned callLinkInfoIndex, OpcodeID opcodeID)
+void JIT::compileOpCallSlowCase(OpcodeID opcodeID, Instruction*, Vector<SlowCaseEntry>::iterator& iter, unsigned callLinkInfoIndex)
{
- int argCount = instruction[2].u.operand;
- int registerOffset = instruction[3].u.operand;
+ if (opcodeID == op_call_eval) {
+ compileCallEvalSlowCase(iter);
+ return;
+ }
linkSlowCase(iter);
-
- // Fast check for JS function.
- Jump callLinkFailNotObject = emitJumpIfNotJSCell(regT0);
- Jump callLinkFailNotJSFunction = emitJumpIfNotType(regT0, regT3, JSFunctionType);
-
- // Speculatively roll the callframe, assuming argCount will match the arity.
- storePtr(callFrameRegister, Address(callFrameRegister, (RegisterFile::CallerFrame + registerOffset) * static_cast<int>(sizeof(Register))));
- addPtr(Imm32(registerOffset * static_cast<int>(sizeof(Register))), callFrameRegister);
- move(Imm32(argCount), regT1);
-
+
m_callStructureStubCompilationInfo[callLinkInfoIndex].callReturnLocation = emitNakedCall(opcodeID == op_construct ? m_globalData->jitStubs->ctiVirtualConstructLink() : m_globalData->jitStubs->ctiVirtualCallLink());
- // Done! - return back to the hot path.
- ASSERT(OPCODE_LENGTH(op_call) == OPCODE_LENGTH(op_call_eval));
- ASSERT(OPCODE_LENGTH(op_call) == OPCODE_LENGTH(op_construct));
- emitJumpSlowToHot(jump(), OPCODE_LENGTH(op_call));
-
- // This handles host functions
- callLinkFailNotObject.link(this);
- callLinkFailNotJSFunction.link(this);
-
- JITStubCall stubCall(this, opcodeID == op_construct ? cti_op_construct_NotJSConstruct : cti_op_call_NotJSFunction);
- stubCall.addArgument(regT0);
- stubCall.addArgument(JIT::Imm32(registerOffset));
- stubCall.addArgument(JIT::Imm32(argCount));
- stubCall.call();
-
sampleCodeBlock(m_codeBlock);
}
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