Updated WebKit from /home/shausman/src/webkit/trunk to qtwebkit-4.6-snapshot-15062009 ( 65232bf00dc494ebfd978f998c88f58d18ecce1e )

1 files changed, 1183 insertions, 0 deletions

diff --git a/src/3rdparty/webkit/JavaScriptCore/jit/JITOpcodes.cpp b/src/3rdparty/webkit/JavaScriptCore/jit/JITOpcodes.cpp
new file mode 100644
index 0000000..1737551
--- /dev/null
+++ b/src/3rdparty/webkit/JavaScriptCore/jit/JITOpcodes.cpp
@@ -0,0 +1,1183 @@
+/*
+ * Copyright (C) 2009 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ */
+
+#include "config.h"
+#include "JIT.h"
+
+#if ENABLE(JIT)
+
+#include "JITInlineMethods.h"
+#include "JITStubCall.h"
+#include "JSArray.h"
+#include "JSCell.h"
+
+namespace JSC {
+
+#define RECORD_JUMP_TARGET(targetOffset) \
+   do { m_labels[m_bytecodeIndex + (targetOffset)].used(); } while (false)
+
+void JIT::emit_op_mov(Instruction* currentInstruction)
+{
+    int dst = currentInstruction[1].u.operand;
+    int src = currentInstruction[2].u.operand;
+
+    if (m_codeBlock->isConstantRegisterIndex(src)) {
+        storePtr(ImmPtr(JSValue::encode(getConstantOperand(src))), Address(callFrameRegister, dst * sizeof(Register)));
+        if (dst == m_lastResultBytecodeRegister)
+            killLastResultRegister();
+    } else if ((src == m_lastResultBytecodeRegister) || (dst == m_lastResultBytecodeRegister)) {
+        // If either the src or dst is the cached register go though
+        // get/put registers to make sure we track this correctly.
+        emitGetVirtualRegister(src, regT0);
+        emitPutVirtualRegister(dst);
+    } else {
+        // Perform the copy via regT1; do not disturb any mapping in regT0.
+        loadPtr(Address(callFrameRegister, src * sizeof(Register)), regT1);
+        storePtr(regT1, Address(callFrameRegister, dst * sizeof(Register)));
+    }
+}
+
+void JIT::emit_op_end(Instruction* currentInstruction)
+{
+    if (m_codeBlock->needsFullScopeChain())
+        JITStubCall(this, JITStubs::cti_op_end).call();
+    ASSERT(returnValueRegister != callFrameRegister);
+    emitGetVirtualRegister(currentInstruction[1].u.operand, returnValueRegister);
+    restoreReturnAddressBeforeReturn(Address(callFrameRegister, RegisterFile::ReturnPC * static_cast<int>(sizeof(Register))));
+    ret();
+}
+
+void JIT::emit_op_jmp(Instruction* currentInstruction)
+{
+    unsigned target = currentInstruction[1].u.operand;
+    addJump(jump(), target + 1);
+    RECORD_JUMP_TARGET(target + 1);
+}
+
+void JIT::emit_op_loop(Instruction* currentInstruction)
+{
+    emitTimeoutCheck();
+
+    unsigned target = currentInstruction[1].u.operand;
+    addJump(jump(), target + 1);
+}
+
+void JIT::emit_op_loop_if_less(Instruction* currentInstruction)
+{
+    emitTimeoutCheck();
+
+    unsigned op1 = currentInstruction[1].u.operand;
+    unsigned op2 = currentInstruction[2].u.operand;
+    unsigned target = currentInstruction[3].u.operand;
+    if (isOperandConstantImmediateInt(op2)) {
+        emitGetVirtualRegister(op1, regT0);
+        emitJumpSlowCaseIfNotImmediateInteger(regT0);
+#if USE(ALTERNATE_JSIMMEDIATE)
+        int32_t op2imm = getConstantOperandImmediateInt(op2);
+#else
+        int32_t op2imm = static_cast<int32_t>(JSImmediate::rawValue(getConstantOperand(op2)));
+#endif
+        addJump(branch32(LessThan, regT0, Imm32(op2imm)), target + 3);
+    } else if (isOperandConstantImmediateInt(op1)) {
+        emitGetVirtualRegister(op2, regT0);
+        emitJumpSlowCaseIfNotImmediateInteger(regT0);
+#if USE(ALTERNATE_JSIMMEDIATE)
+        int32_t op1imm = getConstantOperandImmediateInt(op1);
+#else
+        int32_t op1imm = static_cast<int32_t>(JSImmediate::rawValue(getConstantOperand(op1)));
+#endif
+        addJump(branch32(GreaterThan, regT0, Imm32(op1imm)), target + 3);
+    } else {
+        emitGetVirtualRegisters(op1, regT0, op2, regT1);
+        emitJumpSlowCaseIfNotImmediateInteger(regT0);
+        emitJumpSlowCaseIfNotImmediateInteger(regT1);
+        addJump(branch32(LessThan, regT0, regT1), target + 3);
+    }
+}
+
+void JIT::emit_op_loop_if_lesseq(Instruction* currentInstruction)
+{
+    emitTimeoutCheck();
+
+    unsigned op1 = currentInstruction[1].u.operand;
+    unsigned op2 = currentInstruction[2].u.operand;
+    unsigned target = currentInstruction[3].u.operand;
+    if (isOperandConstantImmediateInt(op2)) {
+        emitGetVirtualRegister(op1, regT0);
+        emitJumpSlowCaseIfNotImmediateInteger(regT0);
+#if USE(ALTERNATE_JSIMMEDIATE)
+        int32_t op2imm = getConstantOperandImmediateInt(op2);
+#else
+        int32_t op2imm = static_cast<int32_t>(JSImmediate::rawValue(getConstantOperand(op2)));
+#endif
+        addJump(branch32(LessThanOrEqual, regT0, Imm32(op2imm)), target + 3);
+    } else {
+        emitGetVirtualRegisters(op1, regT0, op2, regT1);
+        emitJumpSlowCaseIfNotImmediateInteger(regT0);
+        emitJumpSlowCaseIfNotImmediateInteger(regT1);
+        addJump(branch32(LessThanOrEqual, regT0, regT1), target + 3);
+    }
+}
+
+void JIT::emit_op_new_object(Instruction* currentInstruction)
+{
+    JITStubCall(this, JITStubs::cti_op_new_object).call(currentInstruction[1].u.operand);
+}
+
+void JIT::emit_op_instanceof(Instruction* currentInstruction)
+{
+    // Load the operands (baseVal, proto, and value respectively) into registers.
+    // We use regT0 for baseVal since we will be done with this first, and we can then use it for the result.
+    emitGetVirtualRegister(currentInstruction[3].u.operand, regT0);
+    emitGetVirtualRegister(currentInstruction[4].u.operand, regT1);
+    emitGetVirtualRegister(currentInstruction[2].u.operand, regT2);
+
+    // Check that baseVal & proto are cells.
+    emitJumpSlowCaseIfNotJSCell(regT0);
+    emitJumpSlowCaseIfNotJSCell(regT1);
+
+    // Check that baseVal is an object, that it 'ImplementsHasInstance' but that it does not 'OverridesHasInstance'.
+    loadPtr(Address(regT0, FIELD_OFFSET(JSCell, m_structure)), regT0);
+    addSlowCase(branch32(NotEqual, Address(regT0, FIELD_OFFSET(Structure, m_typeInfo.m_type)), Imm32(ObjectType)));
+    addSlowCase(branchTest32(Zero, Address(regT0, FIELD_OFFSET(Structure, m_typeInfo.m_flags)), Imm32(ImplementsDefaultHasInstance)));
+
+    // If value is not an Object, return false.
+    Jump valueIsImmediate = emitJumpIfNotJSCell(regT2);
+    loadPtr(Address(regT2, FIELD_OFFSET(JSCell, m_structure)), regT0);
+    Jump valueIsNotObject = branch32(NotEqual, Address(regT0, FIELD_OFFSET(Structure, m_typeInfo.m_type)), Imm32(ObjectType));
+
+    // Check proto is object.
+    loadPtr(Address(regT1, FIELD_OFFSET(JSCell, m_structure)), regT0);
+    addSlowCase(branch32(NotEqual, Address(regT0, FIELD_OFFSET(Structure, m_typeInfo.m_type)), Imm32(ObjectType)));
+
+    // Optimistically load the result true, and start looping.
+    // Initially, regT1 still contains proto and regT2 still contains value.
+    // As we loop regT2 will be updated with its prototype, recursively walking the prototype chain.
+    move(ImmPtr(JSValue::encode(jsBoolean(true))), regT0);
+    Label loop(this);
+
+    // Load the prototype of the object in regT2.  If this is equal to regT1 - WIN!
+    // Otherwise, check if we've hit null - if we have then drop out of the loop, if not go again.
+    loadPtr(Address(regT2, FIELD_OFFSET(JSCell, m_structure)), regT2);
+    loadPtr(Address(regT2, FIELD_OFFSET(Structure, m_prototype)), regT2);
+    Jump isInstance = branchPtr(Equal, regT2, regT1);
+    branchPtr(NotEqual, regT2, ImmPtr(JSValue::encode(jsNull())), loop);
+
+    // We get here either by dropping out of the loop, or if value was not an Object.  Result is false.
+    valueIsImmediate.link(this);
+    valueIsNotObject.link(this);
+    move(ImmPtr(JSValue::encode(jsBoolean(false))), regT0);
+
+    // isInstance jumps right down to here, to skip setting the result to false (it has already set true).
+    isInstance.link(this);
+    emitPutVirtualRegister(currentInstruction[1].u.operand);
+}
+
+void JIT::emit_op_new_func(Instruction* currentInstruction)
+{
+    JITStubCall stubCall(this, JITStubs::cti_op_new_func);
+    stubCall.addArgument(ImmPtr(m_codeBlock->function(currentInstruction[2].u.operand)));
+    stubCall.call(currentInstruction[1].u.operand);
+}
+
+void JIT::emit_op_call(Instruction* currentInstruction)
+{
+    compileOpCall(op_call, currentInstruction, m_callLinkInfoIndex++);
+}
+
+void JIT::emit_op_call_eval(Instruction* currentInstruction)
+{
+    compileOpCall(op_call_eval, currentInstruction, m_callLinkInfoIndex++);
+}
+
+void JIT::emit_op_load_varargs(Instruction* currentInstruction)
+{
+    JITStubCall stubCall(this, JITStubs::cti_op_load_varargs);
+    stubCall.addArgument(Imm32(currentInstruction[2].u.operand));
+    stubCall.call(currentInstruction[1].u.operand);
+}
+
+void JIT::emit_op_call_varargs(Instruction* currentInstruction)
+{
+    compileOpCallVarargs(currentInstruction);
+}
+
+void JIT::emit_op_construct(Instruction* currentInstruction)
+{
+    compileOpCall(op_construct, currentInstruction, m_callLinkInfoIndex++);
+}
+
+void JIT::emit_op_get_global_var(Instruction* currentInstruction)
+{
+    JSVariableObject* globalObject = static_cast<JSVariableObject*>(currentInstruction[2].u.jsCell);
+    move(ImmPtr(globalObject), regT0);
+    emitGetVariableObjectRegister(regT0, currentInstruction[3].u.operand, regT0);
+    emitPutVirtualRegister(currentInstruction[1].u.operand);
+}
+
+void JIT::emit_op_put_global_var(Instruction* currentInstruction)
+{
+    emitGetVirtualRegister(currentInstruction[3].u.operand, regT1);
+    JSVariableObject* globalObject = static_cast<JSVariableObject*>(currentInstruction[1].u.jsCell);
+    move(ImmPtr(globalObject), regT0);
+    emitPutVariableObjectRegister(regT1, regT0, currentInstruction[2].u.operand);
+}
+
+void JIT::emit_op_get_scoped_var(Instruction* currentInstruction)
+{
+    int skip = currentInstruction[3].u.operand + m_codeBlock->needsFullScopeChain();
+
+    emitGetFromCallFrameHeaderPtr(RegisterFile::ScopeChain, regT0);
+    while (skip--)
+        loadPtr(Address(regT0, FIELD_OFFSET(ScopeChainNode, next)), regT0);
+
+    loadPtr(Address(regT0, FIELD_OFFSET(ScopeChainNode, object)), regT0);
+    emitGetVariableObjectRegister(regT0, currentInstruction[2].u.operand, regT0);
+    emitPutVirtualRegister(currentInstruction[1].u.operand);
+}
+
+void JIT::emit_op_put_scoped_var(Instruction* currentInstruction)
+{
+    int skip = currentInstruction[2].u.operand + m_codeBlock->needsFullScopeChain();
+
+    emitGetFromCallFrameHeaderPtr(RegisterFile::ScopeChain, regT1);
+    emitGetVirtualRegister(currentInstruction[3].u.operand, regT0);
+    while (skip--)
+        loadPtr(Address(regT1, FIELD_OFFSET(ScopeChainNode, next)), regT1);
+
+    loadPtr(Address(regT1, FIELD_OFFSET(ScopeChainNode, object)), regT1);
+    emitPutVariableObjectRegister(regT0, regT1, currentInstruction[1].u.operand);
+}
+
+void JIT::emit_op_tear_off_activation(Instruction* currentInstruction)
+{
+    JITStubCall stubCall(this, JITStubs::cti_op_tear_off_activation);
+    stubCall.addArgument(currentInstruction[1].u.operand, regT2);
+    stubCall.call();
+}
+
+void JIT::emit_op_tear_off_arguments(Instruction*)
+{
+    JITStubCall(this, JITStubs::cti_op_tear_off_arguments).call();
+}
+
+void JIT::emit_op_ret(Instruction* currentInstruction)
+{
+    // We could JIT generate the deref, only calling out to C when the refcount hits zero.
+    if (m_codeBlock->needsFullScopeChain())
+        JITStubCall(this, JITStubs::cti_op_ret_scopeChain).call();
+
+    ASSERT(callFrameRegister != regT1);
+    ASSERT(regT1 != returnValueRegister);
+    ASSERT(returnValueRegister != callFrameRegister);
+
+    // Return the result in %eax.
+    emitGetVirtualRegister(currentInstruction[1].u.operand, returnValueRegister);
+
+    // Grab the return address.
+    emitGetFromCallFrameHeaderPtr(RegisterFile::ReturnPC, regT1);
+
+    // Restore our caller's "r".
+    emitGetFromCallFrameHeaderPtr(RegisterFile::CallerFrame, callFrameRegister);
+
+    // Return.
+    restoreReturnAddressBeforeReturn(regT1);
+    ret();
+}
+
+void JIT::emit_op_new_array(Instruction* currentInstruction)
+{
+    JITStubCall stubCall(this, JITStubs::cti_op_new_array);
+    stubCall.addArgument(Imm32(currentInstruction[2].u.operand));
+    stubCall.addArgument(Imm32(currentInstruction[3].u.operand));
+    stubCall.call(currentInstruction[1].u.operand);
+}
+
+void JIT::emit_op_resolve(Instruction* currentInstruction)
+{
+    JITStubCall stubCall(this, JITStubs::cti_op_resolve);
+    stubCall.addArgument(ImmPtr(&m_codeBlock->identifier(currentInstruction[2].u.operand)));
+    stubCall.call(currentInstruction[1].u.operand);
+}
+
+void JIT::emit_op_construct_verify(Instruction* currentInstruction)
+{
+    emitGetVirtualRegister(currentInstruction[1].u.operand, regT0);
+
+    emitJumpSlowCaseIfNotJSCell(regT0);
+    loadPtr(Address(regT0, FIELD_OFFSET(JSCell, m_structure)), regT2);
+    addSlowCase(branch32(NotEqual, Address(regT2, FIELD_OFFSET(Structure, m_typeInfo) + FIELD_OFFSET(TypeInfo, m_type)), Imm32(ObjectType)));
+
+}
+
+void JIT::emit_op_to_primitive(Instruction* currentInstruction)
+{
+    int dst = currentInstruction[1].u.operand;
+    int src = currentInstruction[2].u.operand;
+
+    emitGetVirtualRegister(src, regT0);
+    
+    Jump isImm = emitJumpIfNotJSCell(regT0);
+    addSlowCase(branchPtr(NotEqual, Address(regT0), ImmPtr(m_globalData->jsStringVPtr)));
+    isImm.link(this);
+
+    if (dst != src)
+        emitPutVirtualRegister(dst);
+
+}
+
+void JIT::emit_op_strcat(Instruction* currentInstruction)
+{
+    JITStubCall stubCall(this, JITStubs::cti_op_strcat);
+    stubCall.addArgument(Imm32(currentInstruction[2].u.operand));
+    stubCall.addArgument(Imm32(currentInstruction[3].u.operand));
+    stubCall.call(currentInstruction[1].u.operand);
+}
+
+void JIT::emit_op_resolve_func(Instruction* currentInstruction)
+{
+    JITStubCall stubCall(this, JITStubs::cti_op_resolve_func);
+    stubCall.addArgument(ImmPtr(&m_codeBlock->identifier(currentInstruction[3].u.operand)));
+    stubCall.addArgument(Imm32(currentInstruction[1].u.operand));
+    stubCall.call(currentInstruction[2].u.operand);
+}
+
+void JIT::emit_op_loop_if_true(Instruction* currentInstruction)
+{
+    emitTimeoutCheck();
+
+    unsigned target = currentInstruction[2].u.operand;
+    emitGetVirtualRegister(currentInstruction[1].u.operand, regT0);
+
+    Jump isZero = branchPtr(Equal, regT0, ImmPtr(JSValue::encode(jsNumber(m_globalData, 0))));
+    addJump(emitJumpIfImmediateInteger(regT0), target + 2);
+
+    addJump(branchPtr(Equal, regT0, ImmPtr(JSValue::encode(jsBoolean(true)))), target + 2);
+    addSlowCase(branchPtr(NotEqual, regT0, ImmPtr(JSValue::encode(jsBoolean(false)))));
+
+    isZero.link(this);
+};
+void JIT::emit_op_resolve_base(Instruction* currentInstruction)
+{
+    JITStubCall stubCall(this, JITStubs::cti_op_resolve_base);
+    stubCall.addArgument(ImmPtr(&m_codeBlock->identifier(currentInstruction[2].u.operand)));
+    stubCall.call(currentInstruction[1].u.operand);
+}
+
+void JIT::emit_op_resolve_skip(Instruction* currentInstruction)
+{
+    JITStubCall stubCall(this, JITStubs::cti_op_resolve_skip);
+    stubCall.addArgument(ImmPtr(&m_codeBlock->identifier(currentInstruction[2].u.operand)));
+    stubCall.addArgument(Imm32(currentInstruction[3].u.operand + m_codeBlock->needsFullScopeChain()));
+    stubCall.call(currentInstruction[1].u.operand);
+}
+
+void JIT::emit_op_resolve_global(Instruction* currentInstruction)
+{
+    // Fast case
+    void* globalObject = currentInstruction[2].u.jsCell;
+    Identifier* ident = &m_codeBlock->identifier(currentInstruction[3].u.operand);
+    
+    unsigned currentIndex = m_globalResolveInfoIndex++;
+    void* structureAddress = &(m_codeBlock->globalResolveInfo(currentIndex).structure);
+    void* offsetAddr = &(m_codeBlock->globalResolveInfo(currentIndex).offset);
+
+    // Check Structure of global object
+    move(ImmPtr(globalObject), regT0);
+    loadPtr(structureAddress, regT1);
+    Jump noMatch = branchPtr(NotEqual, regT1, Address(regT0, FIELD_OFFSET(JSCell, m_structure))); // Structures don't match
+
+    // Load cached property
+    // Assume that the global object always uses external storage.
+    loadPtr(Address(regT0, FIELD_OFFSET(JSGlobalObject, m_externalStorage)), regT0);
+    load32(offsetAddr, regT1);
+    loadPtr(BaseIndex(regT0, regT1, ScalePtr), regT0);
+    emitPutVirtualRegister(currentInstruction[1].u.operand);
+    Jump end = jump();
+
+    // Slow case
+    noMatch.link(this);
+    JITStubCall stubCall(this, JITStubs::cti_op_resolve_global);
+    stubCall.addArgument(ImmPtr(globalObject));
+    stubCall.addArgument(ImmPtr(ident));
+    stubCall.addArgument(Imm32(currentIndex));
+    stubCall.call(currentInstruction[1].u.operand);
+    end.link(this);
+}
+
+void JIT::emit_op_not(Instruction* currentInstruction)
+{
+    emitGetVirtualRegister(currentInstruction[2].u.operand, regT0);
+    xorPtr(Imm32(static_cast<int32_t>(JSImmediate::FullTagTypeBool)), regT0);
+    addSlowCase(branchTestPtr(NonZero, regT0, Imm32(static_cast<int32_t>(~JSImmediate::ExtendedPayloadBitBoolValue))));
+    xorPtr(Imm32(static_cast<int32_t>(JSImmediate::FullTagTypeBool | JSImmediate::ExtendedPayloadBitBoolValue)), regT0);
+    emitPutVirtualRegister(currentInstruction[1].u.operand);
+}
+
+void JIT::emit_op_jfalse(Instruction* currentInstruction)
+{
+    unsigned target = currentInstruction[2].u.operand;
+    emitGetVirtualRegister(currentInstruction[1].u.operand, regT0);
+
+    addJump(branchPtr(Equal, regT0, ImmPtr(JSValue::encode(jsNumber(m_globalData, 0)))), target + 2);
+    Jump isNonZero = emitJumpIfImmediateInteger(regT0);
+
+    addJump(branchPtr(Equal, regT0, ImmPtr(JSValue::encode(jsBoolean(false)))), target + 2);
+    addSlowCase(branchPtr(NotEqual, regT0, ImmPtr(JSValue::encode(jsBoolean(true)))));
+
+    isNonZero.link(this);
+    RECORD_JUMP_TARGET(target + 2);
+};
+void JIT::emit_op_jeq_null(Instruction* currentInstruction)
+{
+    unsigned src = currentInstruction[1].u.operand;
+    unsigned target = currentInstruction[2].u.operand;
+
+    emitGetVirtualRegister(src, regT0);
+    Jump isImmediate = emitJumpIfNotJSCell(regT0);
+
+    // First, handle JSCell cases - check MasqueradesAsUndefined bit on the structure.
+    loadPtr(Address(regT0, FIELD_OFFSET(JSCell, m_structure)), regT2);
+    addJump(branchTest32(NonZero, Address(regT2, FIELD_OFFSET(Structure, m_typeInfo.m_flags)), Imm32(MasqueradesAsUndefined)), target + 2);
+    Jump wasNotImmediate = jump();
+
+    // Now handle the immediate cases - undefined & null
+    isImmediate.link(this);
+    andPtr(Imm32(~JSImmediate::ExtendedTagBitUndefined), regT0);
+    addJump(branchPtr(Equal, regT0, ImmPtr(JSValue::encode(jsNull()))), target + 2);            
+
+    wasNotImmediate.link(this);
+    RECORD_JUMP_TARGET(target + 2);
+};
+void JIT::emit_op_jneq_null(Instruction* currentInstruction)
+{
+    unsigned src = currentInstruction[1].u.operand;
+    unsigned target = currentInstruction[2].u.operand;
+
+    emitGetVirtualRegister(src, regT0);
+    Jump isImmediate = emitJumpIfNotJSCell(regT0);
+
+    // First, handle JSCell cases - check MasqueradesAsUndefined bit on the structure.
+    loadPtr(Address(regT0, FIELD_OFFSET(JSCell, m_structure)), regT2);
+    addJump(branchTest32(Zero, Address(regT2, FIELD_OFFSET(Structure, m_typeInfo.m_flags)), Imm32(MasqueradesAsUndefined)), target + 2);
+    Jump wasNotImmediate = jump();
+
+    // Now handle the immediate cases - undefined & null
+    isImmediate.link(this);
+    andPtr(Imm32(~JSImmediate::ExtendedTagBitUndefined), regT0);
+    addJump(branchPtr(NotEqual, regT0, ImmPtr(JSValue::encode(jsNull()))), target + 2);            
+
+    wasNotImmediate.link(this);
+    RECORD_JUMP_TARGET(target + 2);
+}
+
+void JIT::emit_op_jneq_ptr(Instruction* currentInstruction)
+{
+    unsigned src = currentInstruction[1].u.operand;
+    JSCell* ptr = currentInstruction[2].u.jsCell;
+    unsigned target = currentInstruction[3].u.operand;
+    
+    emitGetVirtualRegister(src, regT0);
+    addJump(branchPtr(NotEqual, regT0, ImmPtr(JSValue::encode(JSValue(ptr)))), target + 3);            
+
+    RECORD_JUMP_TARGET(target + 3);
+}
+
+void JIT::emit_op_unexpected_load(Instruction* currentInstruction)
+{
+    JSValue v = m_codeBlock->unexpectedConstant(currentInstruction[2].u.operand);
+    move(ImmPtr(JSValue::encode(v)), regT0);
+    emitPutVirtualRegister(currentInstruction[1].u.operand);
+}
+
+void JIT::emit_op_jsr(Instruction* currentInstruction)
+{
+    int retAddrDst = currentInstruction[1].u.operand;
+    int target = currentInstruction[2].u.operand;
+    DataLabelPtr storeLocation = storePtrWithPatch(ImmPtr(0), Address(callFrameRegister, sizeof(Register) * retAddrDst));
+    addJump(jump(), target + 2);
+    m_jsrSites.append(JSRInfo(storeLocation, label()));
+    killLastResultRegister();
+    RECORD_JUMP_TARGET(target + 2);
+}
+
+void JIT::emit_op_sret(Instruction* currentInstruction)
+{
+    jump(Address(callFrameRegister, sizeof(Register) * currentInstruction[1].u.operand));
+    killLastResultRegister();
+}
+
+void JIT::emit_op_eq(Instruction* currentInstruction)
+{
+    emitGetVirtualRegisters(currentInstruction[2].u.operand, regT0, currentInstruction[3].u.operand, regT1);
+    emitJumpSlowCaseIfNotImmediateIntegers(regT0, regT1, regT2);
+    set32(Equal, regT1, regT0, regT0);
+    emitTagAsBoolImmediate(regT0);
+    emitPutVirtualRegister(currentInstruction[1].u.operand);
+}
+
+void JIT::emit_op_bitnot(Instruction* currentInstruction)
+{
+    emitGetVirtualRegister(currentInstruction[2].u.operand, regT0);
+    emitJumpSlowCaseIfNotImmediateInteger(regT0);
+#if USE(ALTERNATE_JSIMMEDIATE)
+    not32(regT0);
+    emitFastArithIntToImmNoCheck(regT0, regT0);
+#else
+    xorPtr(Imm32(~JSImmediate::TagTypeNumber), regT0);
+#endif
+    emitPutVirtualRegister(currentInstruction[1].u.operand);
+}
+
+void JIT::emit_op_resolve_with_base(Instruction* currentInstruction)
+{
+    JITStubCall stubCall(this, JITStubs::cti_op_resolve_with_base);
+    stubCall.addArgument(ImmPtr(&m_codeBlock->identifier(currentInstruction[3].u.operand)));
+    stubCall.addArgument(Imm32(currentInstruction[1].u.operand));
+    stubCall.call(currentInstruction[2].u.operand);
+}
+
+void JIT::emit_op_new_func_exp(Instruction* currentInstruction)
+{
+    JITStubCall stubCall(this, JITStubs::cti_op_new_func_exp);
+    stubCall.addArgument(ImmPtr(m_codeBlock->functionExpression(currentInstruction[2].u.operand)));
+    stubCall.call(currentInstruction[1].u.operand);
+}
+
+void JIT::emit_op_jtrue(Instruction* currentInstruction)
+{
+    unsigned target = currentInstruction[2].u.operand;
+    emitGetVirtualRegister(currentInstruction[1].u.operand, regT0);
+
+    Jump isZero = branchPtr(Equal, regT0, ImmPtr(JSValue::encode(jsNumber(m_globalData, 0))));
+    addJump(emitJumpIfImmediateInteger(regT0), target + 2);
+
+    addJump(branchPtr(Equal, regT0, ImmPtr(JSValue::encode(jsBoolean(true)))), target + 2);
+    addSlowCase(branchPtr(NotEqual, regT0, ImmPtr(JSValue::encode(jsBoolean(false)))));
+
+    isZero.link(this);
+    RECORD_JUMP_TARGET(target + 2);
+}
+
+void JIT::emit_op_neq(Instruction* currentInstruction)
+{
+    emitGetVirtualRegisters(currentInstruction[2].u.operand, regT0, currentInstruction[3].u.operand, regT1);
+    emitJumpSlowCaseIfNotImmediateIntegers(regT0, regT1, regT2);
+    set32(NotEqual, regT1, regT0, regT0);
+    emitTagAsBoolImmediate(regT0);
+
+    emitPutVirtualRegister(currentInstruction[1].u.operand);
+
+}
+
+void JIT::emit_op_bitxor(Instruction* currentInstruction)
+{
+    emitGetVirtualRegisters(currentInstruction[2].u.operand, regT0, currentInstruction[3].u.operand, regT1);
+    emitJumpSlowCaseIfNotImmediateIntegers(regT0, regT1, regT2);
+    xorPtr(regT1, regT0);
+    emitFastArithReTagImmediate(regT0, regT0);
+    emitPutVirtualRegister(currentInstruction[1].u.operand);
+}
+
+void JIT::emit_op_new_regexp(Instruction* currentInstruction)
+{
+    JITStubCall stubCall(this, JITStubs::cti_op_new_regexp);
+    stubCall.addArgument(ImmPtr(m_codeBlock->regexp(currentInstruction[2].u.operand)));
+    stubCall.call(currentInstruction[1].u.operand);
+}
+
+void JIT::emit_op_bitor(Instruction* currentInstruction)
+{
+    emitGetVirtualRegisters(currentInstruction[2].u.operand, regT0, currentInstruction[3].u.operand, regT1);
+    emitJumpSlowCaseIfNotImmediateIntegers(regT0, regT1, regT2);
+    orPtr(regT1, regT0);
+    emitPutVirtualRegister(currentInstruction[1].u.operand);
+}
+
+void JIT::emit_op_throw(Instruction* currentInstruction)
+{
+    JITStubCall stubCall(this, JITStubs::cti_op_throw);
+    stubCall.addArgument(currentInstruction[1].u.operand, regT2);
+    stubCall.call();
+    ASSERT(regT0 == returnValueRegister);
+#ifndef NDEBUG
+    // cti_op_throw always changes it's return address,
+    // this point in the code should never be reached.
+    breakpoint();
+#endif
+}
+
+void JIT::emit_op_next_pname(Instruction* currentInstruction)
+{
+    JITStubCall stubCall(this, JITStubs::cti_op_next_pname);
+    stubCall.addArgument(currentInstruction[2].u.operand, regT2);
+    stubCall.call();
+    Jump endOfIter = branchTestPtr(Zero, regT0);
+    emitPutVirtualRegister(currentInstruction[1].u.operand);
+    addJump(jump(), currentInstruction[3].u.operand + 3);
+    endOfIter.link(this);
+}
+
+void JIT::emit_op_push_scope(Instruction* currentInstruction)
+{
+    JITStubCall stubCall(this, JITStubs::cti_op_push_scope);
+    stubCall.addArgument(currentInstruction[1].u.operand, regT2);
+    stubCall.call(currentInstruction[1].u.operand);
+}
+
+void JIT::emit_op_pop_scope(Instruction*)
+{
+    JITStubCall(this, JITStubs::cti_op_pop_scope).call();
+}
+
+void JIT::emit_op_stricteq(Instruction* currentInstruction)
+{
+    compileOpStrictEq(currentInstruction, OpStrictEq);
+}
+
+void JIT::emit_op_nstricteq(Instruction* currentInstruction)
+{
+    compileOpStrictEq(currentInstruction, OpNStrictEq);
+}
+
+void JIT::emit_op_to_jsnumber(Instruction* currentInstruction)
+{
+    int srcVReg = currentInstruction[2].u.operand;
+    emitGetVirtualRegister(srcVReg, regT0);
+    
+    Jump wasImmediate = emitJumpIfImmediateInteger(regT0);
+
+    emitJumpSlowCaseIfNotJSCell(regT0, srcVReg);
+    loadPtr(Address(regT0, FIELD_OFFSET(JSCell, m_structure)), regT2);
+    addSlowCase(branch32(NotEqual, Address(regT2, FIELD_OFFSET(Structure, m_typeInfo.m_type)), Imm32(NumberType)));
+    
+    wasImmediate.link(this);
+
+    emitPutVirtualRegister(currentInstruction[1].u.operand);
+}
+
+void JIT::emit_op_push_new_scope(Instruction* currentInstruction)
+{
+    JITStubCall stubCall(this, JITStubs::cti_op_push_new_scope);
+    stubCall.addArgument(ImmPtr(&m_codeBlock->identifier(currentInstruction[2].u.operand)));
+    stubCall.addArgument(currentInstruction[3].u.operand, regT2);
+    stubCall.call(currentInstruction[1].u.operand);
+}
+
+void JIT::emit_op_catch(Instruction* currentInstruction)
+{
+    killLastResultRegister(); // FIXME: Implicitly treat op_catch as a labeled statement, and remove this line of code.
+    peek(callFrameRegister, offsetof(struct JITStackFrame, callFrame) / sizeof (void*));
+    emitPutVirtualRegister(currentInstruction[1].u.operand);
+}
+
+void JIT::emit_op_jmp_scopes(Instruction* currentInstruction)
+{
+    JITStubCall stubCall(this, JITStubs::cti_op_jmp_scopes);
+    stubCall.addArgument(Imm32(currentInstruction[1].u.operand));
+    stubCall.call();
+    addJump(jump(), currentInstruction[2].u.operand + 2);
+    RECORD_JUMP_TARGET(currentInstruction[2].u.operand + 2);
+}
+
+void JIT::emit_op_switch_imm(Instruction* currentInstruction)
+{
+    unsigned tableIndex = currentInstruction[1].u.operand;
+    unsigned defaultOffset = currentInstruction[2].u.operand;
+    unsigned scrutinee = currentInstruction[3].u.operand;
+
+    // create jump table for switch destinations, track this switch statement.
+    SimpleJumpTable* jumpTable = &m_codeBlock->immediateSwitchJumpTable(tableIndex);
+    m_switches.append(SwitchRecord(jumpTable, m_bytecodeIndex, defaultOffset, SwitchRecord::Immediate));
+    jumpTable->ctiOffsets.grow(jumpTable->branchOffsets.size());
+
+    JITStubCall stubCall(this, JITStubs::cti_op_switch_imm);
+    stubCall.addArgument(scrutinee, regT2);
+    stubCall.addArgument(Imm32(tableIndex));
+    stubCall.call();
+    jump(regT0);
+}
+
+void JIT::emit_op_switch_char(Instruction* currentInstruction)
+{
+    unsigned tableIndex = currentInstruction[1].u.operand;
+    unsigned defaultOffset = currentInstruction[2].u.operand;
+    unsigned scrutinee = currentInstruction[3].u.operand;
+
+    // create jump table for switch destinations, track this switch statement.
+    SimpleJumpTable* jumpTable = &m_codeBlock->characterSwitchJumpTable(tableIndex);
+    m_switches.append(SwitchRecord(jumpTable, m_bytecodeIndex, defaultOffset, SwitchRecord::Character));
+    jumpTable->ctiOffsets.grow(jumpTable->branchOffsets.size());
+
+    JITStubCall stubCall(this, JITStubs::cti_op_switch_char);
+    stubCall.addArgument(scrutinee, regT2);
+    stubCall.addArgument(Imm32(tableIndex));
+    stubCall.call();
+    jump(regT0);
+}
+
+void JIT::emit_op_switch_string(Instruction* currentInstruction)
+{
+    unsigned tableIndex = currentInstruction[1].u.operand;
+    unsigned defaultOffset = currentInstruction[2].u.operand;
+    unsigned scrutinee = currentInstruction[3].u.operand;
+
+    // create jump table for switch destinations, track this switch statement.
+    StringJumpTable* jumpTable = &m_codeBlock->stringSwitchJumpTable(tableIndex);
+    m_switches.append(SwitchRecord(jumpTable, m_bytecodeIndex, defaultOffset));
+
+    JITStubCall stubCall(this, JITStubs::cti_op_switch_string);
+    stubCall.addArgument(scrutinee, regT2);
+    stubCall.addArgument(Imm32(tableIndex));
+    stubCall.call();
+    jump(regT0);
+}
+
+void JIT::emit_op_new_error(Instruction* currentInstruction)
+{
+    JITStubCall stubCall(this, JITStubs::cti_op_new_error);
+    stubCall.addArgument(Imm32(currentInstruction[2].u.operand));
+    stubCall.addArgument(ImmPtr(JSValue::encode(m_codeBlock->unexpectedConstant(currentInstruction[3].u.operand))));
+    stubCall.addArgument(Imm32(m_bytecodeIndex));
+    stubCall.call(currentInstruction[1].u.operand);
+}
+
+void JIT::emit_op_debug(Instruction* currentInstruction)
+{
+    JITStubCall stubCall(this, JITStubs::cti_op_debug);
+    stubCall.addArgument(Imm32(currentInstruction[1].u.operand));
+    stubCall.addArgument(Imm32(currentInstruction[2].u.operand));
+    stubCall.addArgument(Imm32(currentInstruction[3].u.operand));
+    stubCall.call();
+}
+
+void JIT::emit_op_eq_null(Instruction* currentInstruction)
+{
+    unsigned dst = currentInstruction[1].u.operand;
+    unsigned src1 = currentInstruction[2].u.operand;
+
+    emitGetVirtualRegister(src1, regT0);
+    Jump isImmediate = emitJumpIfNotJSCell(regT0);
+
+    loadPtr(Address(regT0, FIELD_OFFSET(JSCell, m_structure)), regT2);
+    setTest32(NonZero, Address(regT2, FIELD_OFFSET(Structure, m_typeInfo.m_flags)), Imm32(MasqueradesAsUndefined), regT0);
+
+    Jump wasNotImmediate = jump();
+
+    isImmediate.link(this);
+
+    andPtr(Imm32(~JSImmediate::ExtendedTagBitUndefined), regT0);
+    setPtr(Equal, regT0, Imm32(JSImmediate::FullTagTypeNull), regT0);
+
+    wasNotImmediate.link(this);
+
+    emitTagAsBoolImmediate(regT0);
+    emitPutVirtualRegister(dst);
+
+}
+
+void JIT::emit_op_neq_null(Instruction* currentInstruction)
+{
+    unsigned dst = currentInstruction[1].u.operand;
+    unsigned src1 = currentInstruction[2].u.operand;
+
+    emitGetVirtualRegister(src1, regT0);
+    Jump isImmediate = emitJumpIfNotJSCell(regT0);
+
+    loadPtr(Address(regT0, FIELD_OFFSET(JSCell, m_structure)), regT2);
+    setTest32(Zero, Address(regT2, FIELD_OFFSET(Structure, m_typeInfo.m_flags)), Imm32(MasqueradesAsUndefined), regT0);
+
+    Jump wasNotImmediate = jump();
+
+    isImmediate.link(this);
+
+    andPtr(Imm32(~JSImmediate::ExtendedTagBitUndefined), regT0);
+    setPtr(NotEqual, regT0, Imm32(JSImmediate::FullTagTypeNull), regT0);
+
+    wasNotImmediate.link(this);
+
+    emitTagAsBoolImmediate(regT0);
+    emitPutVirtualRegister(dst);
+
+}
+
+void JIT::emit_op_enter(Instruction*)
+{
+    // Even though CTI doesn't use them, we initialize our constant
+    // registers to zap stale pointers, to avoid unnecessarily prolonging
+    // object lifetime and increasing GC pressure.
+    size_t count = m_codeBlock->m_numVars + m_codeBlock->numberOfConstantRegisters();
+    for (size_t j = 0; j < count; ++j)
+        emitInitRegister(j);
+
+}
+
+void JIT::emit_op_enter_with_activation(Instruction* currentInstruction)
+{
+    // Even though CTI doesn't use them, we initialize our constant
+    // registers to zap stale pointers, to avoid unnecessarily prolonging
+    // object lifetime and increasing GC pressure.
+    size_t count = m_codeBlock->m_numVars + m_codeBlock->numberOfConstantRegisters();
+    for (size_t j = 0; j < count; ++j)
+        emitInitRegister(j);
+
+    JITStubCall(this, JITStubs::cti_op_push_activation).call(currentInstruction[1].u.operand);
+}
+
+void JIT::emit_op_create_arguments(Instruction*)
+{
+    Jump argsCreated = branchTestPtr(NonZero, Address(callFrameRegister, sizeof(Register) * RegisterFile::ArgumentsRegister));
+    if (m_codeBlock->m_numParameters == 1)
+        JITStubCall(this, JITStubs::cti_op_create_arguments_no_params).call();
+    else
+        JITStubCall(this, JITStubs::cti_op_create_arguments).call();
+    argsCreated.link(this);
+}
+    
+void JIT::emit_op_init_arguments(Instruction*)
+{
+    storePtr(ImmPtr(0), Address(callFrameRegister, sizeof(Register) * RegisterFile::ArgumentsRegister));
+}
+
+void JIT::emit_op_convert_this(Instruction* currentInstruction)
+{
+    emitGetVirtualRegister(currentInstruction[1].u.operand, regT0);
+
+    emitJumpSlowCaseIfNotJSCell(regT0);
+    loadPtr(Address(regT0, FIELD_OFFSET(JSCell, m_structure)), regT1);
+    addSlowCase(branchTest32(NonZero, Address(regT1, FIELD_OFFSET(Structure, m_typeInfo.m_flags)), Imm32(NeedsThisConversion)));
+
+}
+
+void JIT::emit_op_profile_will_call(Instruction* currentInstruction)
+{
+    peek(regT1, FIELD_OFFSET(JITStackFrame, enabledProfilerReference) / sizeof (void*));
+    Jump noProfiler = branchTestPtr(Zero, Address(regT1));
+
+    JITStubCall stubCall(this, JITStubs::cti_op_profile_will_call);
+    stubCall.addArgument(currentInstruction[1].u.operand, regT1);
+    stubCall.call();
+    noProfiler.link(this);
+
+}
+
+void JIT::emit_op_profile_did_call(Instruction* currentInstruction)
+{
+    peek(regT1, FIELD_OFFSET(JITStackFrame, enabledProfilerReference) / sizeof (void*));
+    Jump noProfiler = branchTestPtr(Zero, Address(regT1));
+
+    JITStubCall stubCall(this, JITStubs::cti_op_profile_did_call);
+    stubCall.addArgument(currentInstruction[1].u.operand, regT1);
+    stubCall.call();
+    noProfiler.link(this);
+}
+
+
+// Slow cases
+
+void JIT::emitSlow_op_convert_this(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
+{
+    linkSlowCase(iter);
+    linkSlowCase(iter);
+    JITStubCall stubCall(this, JITStubs::cti_op_convert_this);
+    stubCall.addArgument(regT0);
+    stubCall.call(currentInstruction[1].u.operand);
+}
+
+void JIT::emitSlow_op_construct_verify(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
+{
+    linkSlowCase(iter);
+    linkSlowCase(iter);
+    emitGetVirtualRegister(currentInstruction[2].u.operand, regT0);
+    emitPutVirtualRegister(currentInstruction[1].u.operand);
+}
+
+void JIT::emitSlow_op_to_primitive(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
+{
+    linkSlowCase(iter);
+
+    JITStubCall stubCall(this, JITStubs::cti_op_to_primitive);
+    stubCall.addArgument(regT0);
+    stubCall.call(currentInstruction[1].u.operand);
+}
+
+void JIT::emitSlow_op_get_by_val(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
+{
+    // The slow void JIT::emitSlow_that handles accesses to arrays (below) may jump back up to here. 
+    Label beginGetByValSlow(this);
+
+    Jump notImm = getSlowCase(iter);
+    linkSlowCase(iter);
+    linkSlowCase(iter);
+    emitFastArithIntToImmNoCheck(regT1, regT1);
+
+    notImm.link(this);
+    JITStubCall stubCall(this, JITStubs::cti_op_get_by_val);
+    stubCall.addArgument(regT0);
+    stubCall.addArgument(regT1);
+    stubCall.call(currentInstruction[1].u.operand);
+    emitJumpSlowToHot(jump(), OPCODE_LENGTH(op_get_by_val));
+
+    // This is slow void JIT::emitSlow_that handles accesses to arrays above the fast cut-off.
+    // First, check if this is an access to the vector
+    linkSlowCase(iter);
+    branch32(AboveOrEqual, regT1, Address(regT2, FIELD_OFFSET(ArrayStorage, m_vectorLength)), beginGetByValSlow);
+
+    // okay, missed the fast region, but it is still in the vector.  Get the value.
+    loadPtr(BaseIndex(regT2, regT1, ScalePtr, FIELD_OFFSET(ArrayStorage, m_vector[0])), regT2);
+    // Check whether the value loaded is zero; if so we need to return undefined.
+    branchTestPtr(Zero, regT2, beginGetByValSlow);
+    move(regT2, regT0);
+    emitPutVirtualRegister(currentInstruction[1].u.operand, regT0);
+}
+
+void JIT::emitSlow_op_loop_if_less(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
+{
+    unsigned op1 = currentInstruction[1].u.operand;
+    unsigned op2 = currentInstruction[2].u.operand;
+    unsigned target = currentInstruction[3].u.operand;
+    if (isOperandConstantImmediateInt(op2)) {
+        linkSlowCase(iter);
+        JITStubCall stubCall(this, JITStubs::cti_op_loop_if_less);
+        stubCall.addArgument(regT0);
+        stubCall.addArgument(op2, regT2);
+        stubCall.call();
+        emitJumpSlowToHot(branchTest32(NonZero, regT0), target + 3);
+    } else if (isOperandConstantImmediateInt(op1)) {
+        linkSlowCase(iter);
+        JITStubCall stubCall(this, JITStubs::cti_op_loop_if_less);
+        stubCall.addArgument(op1, regT2);
+        stubCall.addArgument(regT0);
+        stubCall.call();
+        emitJumpSlowToHot(branchTest32(NonZero, regT0), target + 3);
+    } else {
+        linkSlowCase(iter);
+        linkSlowCase(iter);
+        JITStubCall stubCall(this, JITStubs::cti_op_loop_if_less);
+        stubCall.addArgument(regT0);
+        stubCall.addArgument(regT1);
+        stubCall.call();
+        emitJumpSlowToHot(branchTest32(NonZero, regT0), target + 3);
+    }
+}
+
+void JIT::emitSlow_op_loop_if_lesseq(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
+{
+    unsigned op2 = currentInstruction[2].u.operand;
+    unsigned target = currentInstruction[3].u.operand;
+    if (isOperandConstantImmediateInt(op2)) {
+        linkSlowCase(iter);
+        JITStubCall stubCall(this, JITStubs::cti_op_loop_if_lesseq);
+        stubCall.addArgument(regT0);
+        stubCall.addArgument(currentInstruction[2].u.operand, regT2);
+        stubCall.call();
+        emitJumpSlowToHot(branchTest32(NonZero, regT0), target + 3);
+    } else {
+        linkSlowCase(iter);
+        linkSlowCase(iter);
+        JITStubCall stubCall(this, JITStubs::cti_op_loop_if_lesseq);
+        stubCall.addArgument(regT0);
+        stubCall.addArgument(regT1);
+        stubCall.call();
+        emitJumpSlowToHot(branchTest32(NonZero, regT0), target + 3);
+    }
+}
+
+void JIT::emitSlow_op_put_by_val(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
+{
+    // Normal slow cases - either is not an immediate imm, or is an array.
+    Jump notImm = getSlowCase(iter);
+    linkSlowCase(iter);
+    linkSlowCase(iter);
+    emitFastArithIntToImmNoCheck(regT1, regT1);
+
+    notImm.link(this); {
+        JITStubCall stubCall(this, JITStubs::cti_op_put_by_val);
+        stubCall.addArgument(regT0);
+        stubCall.addArgument(regT1);
+        stubCall.addArgument(currentInstruction[3].u.operand, regT2);
+        stubCall.call();
+        emitJumpSlowToHot(jump(), OPCODE_LENGTH(op_put_by_val));
+    }
+
+    // slow cases for immediate int accesses to arrays
+    linkSlowCase(iter);
+    linkSlowCase(iter); {
+        JITStubCall stubCall(this, JITStubs::cti_op_put_by_val_array);
+        stubCall.addArgument(regT0);
+        stubCall.addArgument(regT1);
+        stubCall.addArgument(currentInstruction[3].u.operand, regT2);
+        stubCall.call();
+    }
+}
+
+void JIT::emitSlow_op_loop_if_true(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
+{
+    linkSlowCase(iter);
+    JITStubCall stubCall(this, JITStubs::cti_op_jtrue);
+    stubCall.addArgument(regT0);
+    stubCall.call();
+    emitJumpSlowToHot(branchTest32(NonZero, regT0), currentInstruction[2].u.operand + 2);
+}
+
+void JIT::emitSlow_op_not(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
+{
+    linkSlowCase(iter);
+    xorPtr(Imm32(static_cast<int32_t>(JSImmediate::FullTagTypeBool)), regT0);
+    JITStubCall stubCall(this, JITStubs::cti_op_not);
+    stubCall.addArgument(regT0);
+    stubCall.call(currentInstruction[1].u.operand);
+}
+
+void JIT::emitSlow_op_jfalse(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
+{
+    linkSlowCase(iter);
+    JITStubCall stubCall(this, JITStubs::cti_op_jtrue);
+    stubCall.addArgument(regT0);
+    stubCall.call();
+    emitJumpSlowToHot(branchTest32(Zero, regT0), currentInstruction[2].u.operand + 2); // inverted!
+}
+
+void JIT::emitSlow_op_bitnot(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
+{
+    linkSlowCase(iter);
+    JITStubCall stubCall(this, JITStubs::cti_op_bitnot);
+    stubCall.addArgument(regT0);
+    stubCall.call(currentInstruction[1].u.operand);
+}
+
+void JIT::emitSlow_op_jtrue(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
+{
+    linkSlowCase(iter);
+    JITStubCall stubCall(this, JITStubs::cti_op_jtrue);
+    stubCall.addArgument(regT0);
+    stubCall.call();
+    emitJumpSlowToHot(branchTest32(NonZero, regT0), currentInstruction[2].u.operand + 2);
+}
+
+void JIT::emitSlow_op_bitxor(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
+{
+    linkSlowCase(iter);
+    JITStubCall stubCall(this, JITStubs::cti_op_bitxor);
+    stubCall.addArgument(regT0);
+    stubCall.addArgument(regT1);
+    stubCall.call(currentInstruction[1].u.operand);
+}
+
+void JIT::emitSlow_op_bitor(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
+{
+    linkSlowCase(iter);
+    JITStubCall stubCall(this, JITStubs::cti_op_bitor);
+    stubCall.addArgument(regT0);
+    stubCall.addArgument(regT1);
+    stubCall.call(currentInstruction[1].u.operand);
+}
+
+void JIT::emitSlow_op_eq(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
+{
+    linkSlowCase(iter);
+    JITStubCall stubCall(this, JITStubs::cti_op_eq);
+    stubCall.addArgument(regT0);
+    stubCall.addArgument(regT1);
+    stubCall.call(currentInstruction[1].u.operand);
+}
+
+void JIT::emitSlow_op_neq(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
+{
+    linkSlowCase(iter);
+    JITStubCall stubCall(this, JITStubs::cti_op_neq);
+    stubCall.addArgument(regT0);
+    stubCall.addArgument(regT1);
+    stubCall.call(currentInstruction[1].u.operand);
+}
+
+void JIT::emitSlow_op_stricteq(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
+{
+    linkSlowCase(iter);
+    linkSlowCase(iter);
+    JITStubCall stubCall(this, JITStubs::cti_op_stricteq);
+    stubCall.addArgument(regT0);
+    stubCall.addArgument(regT1);
+    stubCall.call(currentInstruction[1].u.operand);
+}
+
+void JIT::emitSlow_op_nstricteq(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
+{
+    linkSlowCase(iter);
+    linkSlowCase(iter);
+    JITStubCall stubCall(this, JITStubs::cti_op_nstricteq);
+    stubCall.addArgument(regT0);
+    stubCall.addArgument(regT1);
+    stubCall.call(currentInstruction[1].u.operand);
+}
+
+void JIT::emitSlow_op_instanceof(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
+{
+    linkSlowCase(iter);
+    linkSlowCase(iter);
+    linkSlowCase(iter);
+    linkSlowCase(iter);
+    linkSlowCase(iter);
+    JITStubCall stubCall(this, JITStubs::cti_op_instanceof);
+    stubCall.addArgument(currentInstruction[2].u.operand, regT2);
+    stubCall.addArgument(currentInstruction[3].u.operand, regT2);
+    stubCall.addArgument(currentInstruction[4].u.operand, regT2);
+    stubCall.call(currentInstruction[1].u.operand);
+}
+
+void JIT::emitSlow_op_call(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
+{
+    compileOpCallSlowCase(currentInstruction, iter, m_callLinkInfoIndex++, op_call);
+}
+
+void JIT::emitSlow_op_call_eval(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
+{
+    compileOpCallSlowCase(currentInstruction, iter, m_callLinkInfoIndex++, op_call_eval);
+}
+
+void JIT::emitSlow_op_call_varargs(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
+{
+    compileOpCallVarargsSlowCase(currentInstruction, iter);
+}
+
+void JIT::emitSlow_op_construct(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
+{
+    compileOpCallSlowCase(currentInstruction, iter, m_callLinkInfoIndex++, op_construct);
+}
+
+void JIT::emitSlow_op_to_jsnumber(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
+{
+    linkSlowCaseIfNotJSCell(iter, currentInstruction[2].u.operand);
+    linkSlowCase(iter);
+
+    JITStubCall stubCall(this, JITStubs::cti_op_to_jsnumber);
+    stubCall.addArgument(regT0);
+    stubCall.call(currentInstruction[1].u.operand);
+}
+
+
+} // namespace JSC
+
+#endif // ENABLE(JIT)