webkitgtk-2.4.11webkitgtk-2.4.11

1 files changed, 62 insertions, 198 deletions

diff --git a/Source/JavaScriptCore/dfg/DFGOSRExitCompilerCommon.cpp b/Source/JavaScriptCore/dfg/DFGOSRExitCompilerCommon.cpp
index 00bbe8b4e..9f84a2968 100644
--- a/Source/JavaScriptCore/dfg/DFGOSRExitCompilerCommon.cpp
+++ b/Source/JavaScriptCore/dfg/DFGOSRExitCompilerCommon.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013-2015 Apple Inc. All rights reserved.
+ * Copyright (C) 2013 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -28,20 +28,16 @@
 
 #if ENABLE(DFG_JIT)
 
-#include "DFGJITCode.h"
+#include "Arguments.h"
 #include "DFGOperations.h"
-#include "JIT.h"
 #include "JSCJSValueInlines.h"
-#include "JSCInlines.h"
+#include "Operations.h"
 
 namespace JSC { namespace DFG {
 
 void handleExitCounts(CCallHelpers& jit, const OSRExitBase& exit)
 {
     jit.add32(AssemblyHelpers::TrustedImm32(1), AssemblyHelpers::AbsoluteAddress(&exit.m_count));
-
-    if (!exitKindMayJettison(exit.m_kind))
-        return;
     
     jit.move(AssemblyHelpers::TrustedImmPtr(jit.codeBlock()), GPRInfo::regT0);
     
@@ -56,55 +52,20 @@ void handleExitCounts(CCallHelpers& jit, const OSRExitBase& exit)
         AssemblyHelpers::GreaterThanOrEqual,
         AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfJITExecuteCounter()),
         AssemblyHelpers::TrustedImm32(0));
-    
-    // We want to figure out if there's a possibility that we're in a loop. For the outermost
-    // code block in the inline stack, we handle this appropriately by having the loop OSR trigger
-    // check the exit count of the replacement of the CodeBlock from which we are OSRing. The
-    // problem is the inlined functions, which might also have loops, but whose baseline versions
-    // don't know where to look for the exit count. Figure out if those loops are severe enough
-    // that we had tried to OSR enter. If so, then we should use the loop reoptimization trigger.
-    // Otherwise, we should use the normal reoptimization trigger.
-    
-    AssemblyHelpers::JumpList loopThreshold;
-    
-    for (InlineCallFrame* inlineCallFrame = exit.m_codeOrigin.inlineCallFrame; inlineCallFrame; inlineCallFrame = inlineCallFrame->directCaller.inlineCallFrame) {
-        loopThreshold.append(
-            jit.branchTest8(
-                AssemblyHelpers::NonZero,
-                AssemblyHelpers::AbsoluteAddress(
-                    inlineCallFrame->baselineCodeBlock->ownerScriptExecutable()->addressOfDidTryToEnterInLoop())));
-    }
-    
-    jit.move(
-        AssemblyHelpers::TrustedImm32(jit.codeBlock()->exitCountThresholdForReoptimization()),
-        GPRInfo::regT1);
-    
-    if (!loopThreshold.empty()) {
-        AssemblyHelpers::Jump done = jit.jump();
-
-        loopThreshold.link(&jit);
-        jit.move(
-            AssemblyHelpers::TrustedImm32(
-                jit.codeBlock()->exitCountThresholdForReoptimizationFromLoop()),
-            GPRInfo::regT1);
         
-        done.link(&jit);
-    }
-    
-    tooFewFails = jit.branch32(AssemblyHelpers::BelowOrEqual, GPRInfo::regT2, GPRInfo::regT1);
+    tooFewFails = jit.branch32(AssemblyHelpers::BelowOrEqual, GPRInfo::regT2, AssemblyHelpers::TrustedImm32(jit.codeBlock()->exitCountThresholdForReoptimization()));
     
     reoptimizeNow.link(&jit);
     
     // Reoptimize as soon as possible.
 #if !NUMBER_OF_ARGUMENT_REGISTERS
     jit.poke(GPRInfo::regT0);
-    jit.poke(AssemblyHelpers::TrustedImmPtr(&exit), 1);
 #else
     jit.move(GPRInfo::regT0, GPRInfo::argumentGPR0);
-    jit.move(AssemblyHelpers::TrustedImmPtr(&exit), GPRInfo::argumentGPR1);
+    ASSERT(GPRInfo::argumentGPR0 != GPRInfo::regT1);
 #endif
-    jit.move(AssemblyHelpers::TrustedImmPtr(bitwise_cast<void*>(triggerReoptimizationNow)), GPRInfo::nonArgGPR0);
-    jit.call(GPRInfo::nonArgGPR0);
+    jit.move(AssemblyHelpers::TrustedImmPtr(bitwise_cast<void*>(triggerReoptimizationNow)), GPRInfo::regT1);
+    jit.call(GPRInfo::regT1);
     AssemblyHelpers::Jump doneAdjusting = jit.jump();
     
     tooFewFails.link(&jit);
@@ -113,202 +74,105 @@ void handleExitCounts(CCallHelpers& jit, const OSRExitBase& exit)
     int32_t activeThreshold =
         jit.baselineCodeBlock()->adjustedCounterValue(
             Options::thresholdForOptimizeAfterLongWarmUp());
-    int32_t targetValue = applyMemoryUsageHeuristicsAndConvertToInt(
+    int32_t targetValue = ExecutionCounter::applyMemoryUsageHeuristicsAndConvertToInt(
         activeThreshold, jit.baselineCodeBlock());
-    int32_t clippedValue;
-    switch (jit.codeBlock()->jitType()) {
-    case JITCode::DFGJIT:
-        clippedValue = BaselineExecutionCounter::clippedThreshold(jit.codeBlock()->globalObject(), targetValue);
-        break;
-    case JITCode::FTLJIT:
-        clippedValue = UpperTierExecutionCounter::clippedThreshold(jit.codeBlock()->globalObject(), targetValue);
-        break;
-    default:
-        RELEASE_ASSERT_NOT_REACHED();
-#if COMPILER_QUIRK(CONSIDERS_UNREACHABLE_CODE)
-        clippedValue = 0; // Make some compilers, and mhahnenberg, happy.
-#endif
-        break;
-    }
+    int32_t clippedValue =
+        ExecutionCounter::clippedThreshold(jit.codeBlock()->globalObject(), targetValue);
     jit.store32(AssemblyHelpers::TrustedImm32(-clippedValue), AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfJITExecuteCounter()));
     jit.store32(AssemblyHelpers::TrustedImm32(activeThreshold), AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfJITExecutionActiveThreshold()));
-    jit.store32(AssemblyHelpers::TrustedImm32(formattedTotalExecutionCount(clippedValue)), AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfJITExecutionTotalCount()));
+    jit.store32(AssemblyHelpers::TrustedImm32(ExecutionCounter::formattedTotalCount(clippedValue)), AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfJITExecutionTotalCount()));
     
     doneAdjusting.link(&jit);
 }
 
 void reifyInlinedCallFrames(CCallHelpers& jit, const OSRExitBase& exit)
 {
-    // FIXME: We shouldn't leave holes on the stack when performing an OSR exit
-    // in presence of inlined tail calls.
-    // https://bugs.webkit.org/show_bug.cgi?id=147511
     ASSERT(jit.baselineCodeBlock()->jitType() == JITCode::BaselineJIT);
     jit.storePtr(AssemblyHelpers::TrustedImmPtr(jit.baselineCodeBlock()), AssemblyHelpers::addressFor((VirtualRegister)JSStack::CodeBlock));
 
-    const CodeOrigin* codeOrigin;
-    for (codeOrigin = &exit.m_codeOrigin; codeOrigin && codeOrigin->inlineCallFrame; codeOrigin = codeOrigin->inlineCallFrame->getCallerSkippingTailCalls()) {
-        InlineCallFrame* inlineCallFrame = codeOrigin->inlineCallFrame;
-        CodeBlock* baselineCodeBlock = jit.baselineCodeBlockFor(*codeOrigin);
-        InlineCallFrame::Kind trueCallerCallKind;
-        CodeOrigin* trueCaller = inlineCallFrame->getCallerSkippingTailCalls(&trueCallerCallKind);
-        GPRReg callerFrameGPR = GPRInfo::callFrameRegister;
+    CodeOrigin codeOrigin;
+    for (codeOrigin = exit.m_codeOrigin; codeOrigin.inlineCallFrame; codeOrigin = codeOrigin.inlineCallFrame->caller) {
+        InlineCallFrame* inlineCallFrame = codeOrigin.inlineCallFrame;
+        CodeBlock* baselineCodeBlock = jit.baselineCodeBlockFor(codeOrigin);
+        CodeBlock* baselineCodeBlockForCaller = jit.baselineCodeBlockFor(inlineCallFrame->caller);
+        unsigned callBytecodeIndex = inlineCallFrame->caller.bytecodeIndex;
+        CallLinkInfo& callLinkInfo = baselineCodeBlockForCaller->getCallLinkInfo(callBytecodeIndex);
+        
+        void* jumpTarget = callLinkInfo.callReturnLocation.executableAddress();
 
-        if (!trueCaller) {
-            ASSERT(inlineCallFrame->isTail());
-            jit.loadPtr(AssemblyHelpers::Address(GPRInfo::callFrameRegister, CallFrame::returnPCOffset()), GPRInfo::regT3);
-            jit.storePtr(GPRInfo::regT3, AssemblyHelpers::addressForByteOffset(inlineCallFrame->returnPCOffset()));
-            jit.loadPtr(AssemblyHelpers::Address(GPRInfo::callFrameRegister, CallFrame::callerFrameOffset()), GPRInfo::regT3);
+        GPRReg callerFrameGPR;
+        if (inlineCallFrame->caller.inlineCallFrame) {
+            jit.addPtr(AssemblyHelpers::TrustedImm32(inlineCallFrame->caller.inlineCallFrame->stackOffset * sizeof(EncodedJSValue)), GPRInfo::callFrameRegister, GPRInfo::regT3);
             callerFrameGPR = GPRInfo::regT3;
-        } else {
-            CodeBlock* baselineCodeBlockForCaller = jit.baselineCodeBlockFor(*trueCaller);
-            unsigned callBytecodeIndex = trueCaller->bytecodeIndex;
-            void* jumpTarget = nullptr;
-
-            switch (trueCallerCallKind) {
-            case InlineCallFrame::Call:
-            case InlineCallFrame::Construct:
-            case InlineCallFrame::CallVarargs:
-            case InlineCallFrame::ConstructVarargs:
-            case InlineCallFrame::TailCall:
-            case InlineCallFrame::TailCallVarargs: {
-                CallLinkInfo* callLinkInfo =
-                    baselineCodeBlockForCaller->getCallLinkInfoForBytecodeIndex(callBytecodeIndex);
-                RELEASE_ASSERT(callLinkInfo);
-
-                jumpTarget = callLinkInfo->callReturnLocation().executableAddress();
-                break;
-            }
-
-            case InlineCallFrame::GetterCall:
-            case InlineCallFrame::SetterCall: {
-                StructureStubInfo* stubInfo =
-                    baselineCodeBlockForCaller->findStubInfo(CodeOrigin(callBytecodeIndex));
-                RELEASE_ASSERT(stubInfo);
-
-                jumpTarget = stubInfo->callReturnLocation.labelAtOffset(
-                    stubInfo->patch.deltaCallToDone).executableAddress();
-                break;
-            }
-
-            default:
-                RELEASE_ASSERT_NOT_REACHED();
-            }
-
-            if (trueCaller->inlineCallFrame) {
-                jit.addPtr(
-                    AssemblyHelpers::TrustedImm32(trueCaller->inlineCallFrame->stackOffset * sizeof(EncodedJSValue)),
-                    GPRInfo::callFrameRegister,
-                    GPRInfo::regT3);
-                callerFrameGPR = GPRInfo::regT3;
-            }
-
-            jit.storePtr(AssemblyHelpers::TrustedImmPtr(jumpTarget), AssemblyHelpers::addressForByteOffset(inlineCallFrame->returnPCOffset()));
-        }
-
-        jit.storePtr(AssemblyHelpers::TrustedImmPtr(baselineCodeBlock), AssemblyHelpers::addressFor((VirtualRegister)(inlineCallFrame->stackOffset + JSStack::CodeBlock)));
-
-        // Restore the inline call frame's callee save registers.
-        // If this inlined frame is a tail call that will return back to the original caller, we need to
-        // copy the prior contents of the tag registers already saved for the outer frame to this frame.
-        jit.emitSaveOrCopyCalleeSavesFor(
-            baselineCodeBlock,
-            static_cast<VirtualRegister>(inlineCallFrame->stackOffset),
-            trueCaller ? AssemblyHelpers::UseExistingTagRegisterContents : AssemblyHelpers::CopyBaselineCalleeSavedRegistersFromBaseFrame,
-            GPRInfo::regT2);
-
-        if (!inlineCallFrame->isVarargs())
-            jit.store32(AssemblyHelpers::TrustedImm32(inlineCallFrame->arguments.size()), AssemblyHelpers::payloadFor((VirtualRegister)(inlineCallFrame->stackOffset + JSStack::ArgumentCount)));
+        } else
+            callerFrameGPR = GPRInfo::callFrameRegister;
+        
 #if USE(JSVALUE64)
+        jit.storePtr(AssemblyHelpers::TrustedImmPtr(baselineCodeBlock), AssemblyHelpers::addressFor((VirtualRegister)(inlineCallFrame->stackOffset + JSStack::CodeBlock)));
+        if (!inlineCallFrame->isClosureCall)
+            jit.store64(AssemblyHelpers::TrustedImm64(JSValue::encode(JSValue(inlineCallFrame->calleeConstant()->scope()))), AssemblyHelpers::addressFor((VirtualRegister)(inlineCallFrame->stackOffset + JSStack::ScopeChain)));
         jit.store64(callerFrameGPR, AssemblyHelpers::addressForByteOffset(inlineCallFrame->callerFrameOffset()));
-        uint32_t locationBits = CallSiteIndex(codeOrigin->bytecodeIndex).bits();
+        jit.storePtr(AssemblyHelpers::TrustedImmPtr(jumpTarget), AssemblyHelpers::addressForByteOffset(inlineCallFrame->returnPCOffset()));
+        uint32_t locationBits = CallFrame::Location::encodeAsBytecodeOffset(codeOrigin.bytecodeIndex);
         jit.store32(AssemblyHelpers::TrustedImm32(locationBits), AssemblyHelpers::tagFor((VirtualRegister)(inlineCallFrame->stackOffset + JSStack::ArgumentCount)));
+        jit.store32(AssemblyHelpers::TrustedImm32(inlineCallFrame->arguments.size()), AssemblyHelpers::payloadFor((VirtualRegister)(inlineCallFrame->stackOffset + JSStack::ArgumentCount)));
         if (!inlineCallFrame->isClosureCall)
             jit.store64(AssemblyHelpers::TrustedImm64(JSValue::encode(JSValue(inlineCallFrame->calleeConstant()))), AssemblyHelpers::addressFor((VirtualRegister)(inlineCallFrame->stackOffset + JSStack::Callee)));
+        
+        // Leave the captured arguments in regT3.
+        if (baselineCodeBlock->usesArguments())
+            jit.loadPtr(AssemblyHelpers::addressFor(VirtualRegister(inlineCallFrame->stackOffset + unmodifiedArgumentsRegister(baselineCodeBlock->argumentsRegister()).offset())), GPRInfo::regT3);
 #else // USE(JSVALUE64) // so this is the 32-bit part
+        jit.storePtr(AssemblyHelpers::TrustedImmPtr(baselineCodeBlock), AssemblyHelpers::addressFor((VirtualRegister)(inlineCallFrame->stackOffset + JSStack::CodeBlock)));
+        jit.store32(AssemblyHelpers::TrustedImm32(JSValue::CellTag), AssemblyHelpers::tagFor((VirtualRegister)(inlineCallFrame->stackOffset + JSStack::ScopeChain)));
+        if (!inlineCallFrame->isClosureCall)
+            jit.storePtr(AssemblyHelpers::TrustedImmPtr(inlineCallFrame->calleeConstant()->scope()), AssemblyHelpers::payloadFor((VirtualRegister)(inlineCallFrame->stackOffset + JSStack::ScopeChain)));
         jit.storePtr(callerFrameGPR, AssemblyHelpers::addressForByteOffset(inlineCallFrame->callerFrameOffset()));
-        Instruction* instruction = baselineCodeBlock->instructions().begin() + codeOrigin->bytecodeIndex;
-        uint32_t locationBits = CallSiteIndex(instruction).bits();
+        jit.storePtr(AssemblyHelpers::TrustedImmPtr(jumpTarget), AssemblyHelpers::addressForByteOffset(inlineCallFrame->returnPCOffset()));
+        Instruction* instruction = baselineCodeBlock->instructions().begin() + codeOrigin.bytecodeIndex;
+        uint32_t locationBits = CallFrame::Location::encodeAsBytecodeInstruction(instruction);
         jit.store32(AssemblyHelpers::TrustedImm32(locationBits), AssemblyHelpers::tagFor((VirtualRegister)(inlineCallFrame->stackOffset + JSStack::ArgumentCount)));
+        jit.store32(AssemblyHelpers::TrustedImm32(inlineCallFrame->arguments.size()), AssemblyHelpers::payloadFor((VirtualRegister)(inlineCallFrame->stackOffset + JSStack::ArgumentCount)));
         jit.store32(AssemblyHelpers::TrustedImm32(JSValue::CellTag), AssemblyHelpers::tagFor((VirtualRegister)(inlineCallFrame->stackOffset + JSStack::Callee)));
         if (!inlineCallFrame->isClosureCall)
             jit.storePtr(AssemblyHelpers::TrustedImmPtr(inlineCallFrame->calleeConstant()), AssemblyHelpers::payloadFor((VirtualRegister)(inlineCallFrame->stackOffset + JSStack::Callee)));
+
+        // Leave the captured arguments in regT3.
+        if (baselineCodeBlock->usesArguments())
+            jit.loadPtr(AssemblyHelpers::payloadFor(VirtualRegister(inlineCallFrame->stackOffset + unmodifiedArgumentsRegister(baselineCodeBlock->argumentsRegister()).offset())), GPRInfo::regT3);
 #endif // USE(JSVALUE64) // ending the #else part, so directly above is the 32-bit part
+        
+        if (baselineCodeBlock->usesArguments()) {
+            AssemblyHelpers::Jump noArguments = jit.branchTestPtr(AssemblyHelpers::Zero, GPRInfo::regT3);
+            jit.addPtr(AssemblyHelpers::TrustedImm32(inlineCallFrame->stackOffset * sizeof(EncodedJSValue)), GPRInfo::callFrameRegister, GPRInfo::regT0);
+            jit.storePtr(GPRInfo::regT0, AssemblyHelpers::Address(GPRInfo::regT3, Arguments::offsetOfRegisters()));
+            noArguments.link(&jit);
+        }
     }
 
-    // Don't need to set the toplevel code origin if we only did inline tail calls
-    if (codeOrigin) {
 #if USE(JSVALUE64)
-        uint32_t locationBits = CallSiteIndex(codeOrigin->bytecodeIndex).bits();
+    uint32_t locationBits = CallFrame::Location::encodeAsBytecodeOffset(codeOrigin.bytecodeIndex);
 #else
-        Instruction* instruction = jit.baselineCodeBlock()->instructions().begin() + codeOrigin->bytecodeIndex;
-        uint32_t locationBits = CallSiteIndex(instruction).bits();
+    Instruction* instruction = jit.baselineCodeBlock()->instructions().begin() + codeOrigin.bytecodeIndex;
+    uint32_t locationBits = CallFrame::Location::encodeAsBytecodeInstruction(instruction);
 #endif
-        jit.store32(AssemblyHelpers::TrustedImm32(locationBits), AssemblyHelpers::tagFor((VirtualRegister)(JSStack::ArgumentCount)));
-    }
-}
-
-static void osrWriteBarrier(CCallHelpers& jit, GPRReg owner, GPRReg scratch)
-{
-    AssemblyHelpers::Jump ownerIsRememberedOrInEden = jit.jumpIfIsRememberedOrInEden(owner);
-
-    // We need these extra slots because setupArgumentsWithExecState will use poke on x86.
-#if CPU(X86)
-    jit.subPtr(MacroAssembler::TrustedImm32(sizeof(void*) * 3), MacroAssembler::stackPointerRegister);
-#endif
-
-    jit.setupArgumentsWithExecState(owner);
-    jit.move(MacroAssembler::TrustedImmPtr(reinterpret_cast<void*>(operationOSRWriteBarrier)), scratch);
-    jit.call(scratch);
-
-#if CPU(X86)
-    jit.addPtr(MacroAssembler::TrustedImm32(sizeof(void*) * 3), MacroAssembler::stackPointerRegister);
-#endif
-
-    ownerIsRememberedOrInEden.link(&jit);
+    jit.store32(AssemblyHelpers::TrustedImm32(locationBits), AssemblyHelpers::tagFor((VirtualRegister)(JSStack::ArgumentCount)));
 }
 
 void adjustAndJumpToTarget(CCallHelpers& jit, const OSRExitBase& exit)
 {
-    jit.move(
-        AssemblyHelpers::TrustedImmPtr(
-            jit.codeBlock()->baselineAlternative()), GPRInfo::argumentGPR1);
-    osrWriteBarrier(jit, GPRInfo::argumentGPR1, GPRInfo::nonArgGPR0);
-
-    // We barrier all inlined frames -- and not just the current inline stack --
-    // because we don't know which inlined function owns the value profile that
-    // we'll update when we exit. In the case of "f() { a(); b(); }", if both
-    // a and b are inlined, we might exit inside b due to a bad value loaded
-    // from a.
-    // FIXME: MethodOfGettingAValueProfile should remember which CodeBlock owns
-    // the value profile.
-    InlineCallFrameSet* inlineCallFrames = jit.codeBlock()->jitCode()->dfgCommon()->inlineCallFrames.get();
-    if (inlineCallFrames) {
-        for (InlineCallFrame* inlineCallFrame : *inlineCallFrames) {
-            jit.move(
-                AssemblyHelpers::TrustedImmPtr(
-                    inlineCallFrame->baselineCodeBlock.get()), GPRInfo::argumentGPR1);
-            osrWriteBarrier(jit, GPRInfo::argumentGPR1, GPRInfo::nonArgGPR0);
-        }
-    }
-
     if (exit.m_codeOrigin.inlineCallFrame)
         jit.addPtr(AssemblyHelpers::TrustedImm32(exit.m_codeOrigin.inlineCallFrame->stackOffset * sizeof(EncodedJSValue)), GPRInfo::callFrameRegister);
 
-    CodeBlock* codeBlockForExit = jit.baselineCodeBlockFor(exit.m_codeOrigin);
-    Vector<BytecodeAndMachineOffset>& decodedCodeMap = jit.decodedCodeMapFor(codeBlockForExit);
+    CodeBlock* baselineCodeBlock = jit.baselineCodeBlockFor(exit.m_codeOrigin);
+    Vector<BytecodeAndMachineOffset>& decodedCodeMap = jit.decodedCodeMapFor(baselineCodeBlock);
     
     BytecodeAndMachineOffset* mapping = binarySearch<BytecodeAndMachineOffset, unsigned>(decodedCodeMap, decodedCodeMap.size(), exit.m_codeOrigin.bytecodeIndex, BytecodeAndMachineOffset::getBytecodeIndex);
     
     ASSERT(mapping);
     ASSERT(mapping->m_bytecodeIndex == exit.m_codeOrigin.bytecodeIndex);
     
-    void* jumpTarget = codeBlockForExit->jitCode()->executableAddressAtOffset(mapping->m_machineCodeOffset);
-
-    jit.addPtr(AssemblyHelpers::TrustedImm32(JIT::stackPointerOffsetFor(codeBlockForExit) * sizeof(Register)), GPRInfo::callFrameRegister, AssemblyHelpers::stackPointerRegister);
-    if (exit.isExceptionHandler()) {
-        // Since we're jumping to op_catch, we need to set callFrameForCatch.
-        jit.storePtr(GPRInfo::callFrameRegister, jit.vm()->addressOfCallFrameForCatch());
-    }
+    void* jumpTarget = baselineCodeBlock->jitCode()->executableAddressAtOffset(mapping->m_machineCodeOffset);
     
     jit.move(AssemblyHelpers::TrustedImmPtr(jumpTarget), GPRInfo::regT2);
     jit.jump(GPRInfo::regT2);