code.vuplus.com Git - vuplus_webkit/blob - Source/JavaScriptCore/jit/JITOpcodes.cpp

   1 /*
   2  * Copyright (C) 2009 Apple Inc. All rights reserved.
   3  * Copyright (C) 2010 Patrick Gansterer <paroga@paroga.com>
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  17  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  18  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  19  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  20  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  21  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  22  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  24  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #include "config.h"
  28 #if ENABLE(JIT)
  29 #include "JIT.h"
  30
  31 #include "Arguments.h"
  32 #include "Heap.h"
  33 #include "JITInlineMethods.h"
  34 #include "JITStubCall.h"
  35 #include "JSArray.h"
  36 #include "JSCell.h"
  37 #include "JSFunction.h"
  38 #include "JSPropertyNameIterator.h"
  39 #include "LinkBuffer.h"
  40
  41 namespace JSC {
  42
  43 #if USE(JSVALUE64)
  44
  45 PassRefPtr<ExecutableMemoryHandle> JIT::privateCompileCTIMachineTrampolines(JSGlobalData* globalData, TrampolineStructure *trampolines)
  46 {
  47     // (2) The second function provides fast property access for string length
  48     Label stringLengthBegin = align();
  49
  50     // Check eax is a string
  51     Jump string_failureCases1 = emitJumpIfNotJSCell(regT0);
  52     Jump string_failureCases2 = branchPtr(NotEqual, Address(regT0), TrustedImmPtr(m_globalData->jsStringVPtr));
  53
  54     // Checks out okay! - get the length from the Ustring.
  55     load32(Address(regT0, OBJECT_OFFSETOF(JSString, m_length)), regT0);
  56
  57     Jump string_failureCases3 = branch32(LessThan, regT0, TrustedImm32(0));
  58
  59     // regT0 contains a 64 bit value (is positive, is zero extended) so we don't need sign extend here.
  60     emitFastArithIntToImmNoCheck(regT0, regT0);
  61
  62     ret();
  63
  64     // (3) Trampolines for the slow cases of op_call / op_call_eval / op_construct.
  65     COMPILE_ASSERT(sizeof(CodeType) == 4, CodeTypeEnumMustBe32Bit);
  66
  67     // VirtualCallLink Trampoline
  68     // regT0 holds callee, regT1 holds argCount.  regT2 will hold the FunctionExecutable.
  69     JumpList callLinkFailures;
  70     Label virtualCallLinkBegin = align();
  71     compileOpCallInitializeCallFrame();
  72     preserveReturnAddressAfterCall(regT3);
  73     emitPutToCallFrameHeader(regT3, RegisterFile::ReturnPC);
  74     restoreArgumentReference();
  75     Call callLazyLinkCall = call();
  76     callLinkFailures.append(branchTestPtr(Zero, regT0));
  77     restoreReturnAddressBeforeReturn(regT3);
  78     emitGetFromCallFrameHeader32(RegisterFile::ArgumentCount, regT1);
  79     jump(regT0);
  80
  81     // VirtualConstructLink Trampoline
  82     // regT0 holds callee, regT1 holds argCount.  regT2 will hold the FunctionExecutable.
  83     Label virtualConstructLinkBegin = align();
  84     compileOpCallInitializeCallFrame();
  85     preserveReturnAddressAfterCall(regT3);
  86     emitPutToCallFrameHeader(regT3, RegisterFile::ReturnPC);
  87     restoreArgumentReference();
  88     Call callLazyLinkConstruct = call();
  89     callLinkFailures.append(branchTestPtr(Zero, regT0));
  90     restoreReturnAddressBeforeReturn(regT3);
  91     emitGetFromCallFrameHeader32(RegisterFile::ArgumentCount, regT1);
  92     jump(regT0);
  93
  94     // VirtualCall Trampoline
  95     // regT0 holds callee, regT1 holds argCount.  regT2 will hold the FunctionExecutable.
  96     Label virtualCallBegin = align();
  97     compileOpCallInitializeCallFrame();
  98
  99     loadPtr(Address(regT0, OBJECT_OFFSETOF(JSFunction, m_executable)), regT2);
 100
 101     Jump hasCodeBlock3 = branch32(GreaterThanOrEqual, Address(regT2, OBJECT_OFFSETOF(FunctionExecutable, m_numParametersForCall)), TrustedImm32(0));
 102     preserveReturnAddressAfterCall(regT3);
 103     restoreArgumentReference();
 104     Call callCompileCall = call();
 105     callLinkFailures.append(branchTestPtr(Zero, regT0));
 106     emitGetFromCallFrameHeader32(RegisterFile::ArgumentCount, regT1);
 107     restoreReturnAddressBeforeReturn(regT3);
 108     loadPtr(Address(regT0, OBJECT_OFFSETOF(JSFunction, m_executable)), regT2);
 109     hasCodeBlock3.link(this);
 110
 111     loadPtr(Address(regT2, OBJECT_OFFSETOF(FunctionExecutable, m_jitCodeForCallWithArityCheck)), regT0);
 112     jump(regT0);
 113
 114     // VirtualConstruct Trampoline
 115     // regT0 holds callee, regT1 holds argCount.  regT2 will hold the FunctionExecutable.
 116     Label virtualConstructBegin = align();
 117     compileOpCallInitializeCallFrame();
 118
 119     loadPtr(Address(regT0, OBJECT_OFFSETOF(JSFunction, m_executable)), regT2);
 120
 121     Jump hasCodeBlock4 = branch32(GreaterThanOrEqual, Address(regT2, OBJECT_OFFSETOF(FunctionExecutable, m_numParametersForConstruct)), TrustedImm32(0));
 122     preserveReturnAddressAfterCall(regT3);
 123     restoreArgumentReference();
 124     Call callCompileConstruct = call();
 125     callLinkFailures.append(branchTestPtr(Zero, regT0));
 126     emitGetFromCallFrameHeader32(RegisterFile::ArgumentCount, regT1);
 127     restoreReturnAddressBeforeReturn(regT3);
 128     loadPtr(Address(regT0, OBJECT_OFFSETOF(JSFunction, m_executable)), regT2);
 129     hasCodeBlock4.link(this);
 130
 131     loadPtr(Address(regT2, OBJECT_OFFSETOF(FunctionExecutable, m_jitCodeForConstructWithArityCheck)), regT0);
 132     jump(regT0);
 133
 134     // If the parser fails we want to be able to be able to keep going,
 135     // So we handle this as a parse failure.
 136     callLinkFailures.link(this);
 137     emitGetFromCallFrameHeaderPtr(RegisterFile::ReturnPC, regT1);
 138     emitGetFromCallFrameHeaderPtr(RegisterFile::CallerFrame, callFrameRegister);
 139     restoreReturnAddressBeforeReturn(regT1);
 140     move(TrustedImmPtr(&globalData->exceptionLocation), regT2);
 141     storePtr(regT1, regT2);
 142     poke(callFrameRegister, 1 + OBJECT_OFFSETOF(struct JITStackFrame, callFrame) / sizeof(void*));
 143     storePtr(callFrameRegister, &m_globalData->topCallFrame);
 144     poke(TrustedImmPtr(FunctionPtr(ctiVMThrowTrampoline).value()));
 145     ret();
 146
 147     // NativeCall Trampoline
 148     Label nativeCallThunk = privateCompileCTINativeCall(globalData);
 149     Label nativeConstructThunk = privateCompileCTINativeCall(globalData, true);
 150
 151     Call string_failureCases1Call = makeTailRecursiveCall(string_failureCases1);
 152     Call string_failureCases2Call = makeTailRecursiveCall(string_failureCases2);
 153     Call string_failureCases3Call = makeTailRecursiveCall(string_failureCases3);
 154
 155     // All trampolines constructed! copy the code, link up calls, and set the pointers on the Machine object.
 156     LinkBuffer patchBuffer(*m_globalData, this);
 157
 158     patchBuffer.link(string_failureCases1Call, FunctionPtr(cti_op_get_by_id_string_fail));
 159     patchBuffer.link(string_failureCases2Call, FunctionPtr(cti_op_get_by_id_string_fail));
 160     patchBuffer.link(string_failureCases3Call, FunctionPtr(cti_op_get_by_id_string_fail));
 161     patchBuffer.link(callLazyLinkCall, FunctionPtr(cti_vm_lazyLinkCall));
 162     patchBuffer.link(callLazyLinkConstruct, FunctionPtr(cti_vm_lazyLinkConstruct));
 163     patchBuffer.link(callCompileCall, FunctionPtr(cti_op_call_jitCompile));
 164     patchBuffer.link(callCompileConstruct, FunctionPtr(cti_op_construct_jitCompile));
 165
 166     CodeRef finalCode = patchBuffer.finalizeCode();
 167     RefPtr<ExecutableMemoryHandle> executableMemory = finalCode.executableMemory();
 168
 169     trampolines->ctiVirtualCallLink = patchBuffer.trampolineAt(virtualCallLinkBegin);
 170     trampolines->ctiVirtualConstructLink = patchBuffer.trampolineAt(virtualConstructLinkBegin);
 171     trampolines->ctiVirtualCall = patchBuffer.trampolineAt(virtualCallBegin);
 172     trampolines->ctiVirtualConstruct = patchBuffer.trampolineAt(virtualConstructBegin);
 173     trampolines->ctiNativeCall = patchBuffer.trampolineAt(nativeCallThunk);
 174     trampolines->ctiNativeConstruct = patchBuffer.trampolineAt(nativeConstructThunk);
 175     trampolines->ctiStringLengthTrampoline = patchBuffer.trampolineAt(stringLengthBegin);
 176
 177     return executableMemory.release();
 178 }
 179
 180 JIT::Label JIT::privateCompileCTINativeCall(JSGlobalData* globalData, bool isConstruct)
 181 {
 182     int executableOffsetToFunction = isConstruct ? OBJECT_OFFSETOF(NativeExecutable, m_constructor) : OBJECT_OFFSETOF(NativeExecutable, m_function);
 183
 184     Label nativeCallThunk = align();
 185
 186     emitPutImmediateToCallFrameHeader(0, RegisterFile::CodeBlock);
 187
 188 #if CPU(X86_64)
 189     // Load caller frame's scope chain into this callframe so that whatever we call can
 190     // get to its global data.
 191     emitGetFromCallFrameHeaderPtr(RegisterFile::CallerFrame, regT0);
 192     emitGetFromCallFrameHeaderPtr(RegisterFile::ScopeChain, regT1, regT0);
 193     emitPutCellToCallFrameHeader(regT1, RegisterFile::ScopeChain);
 194
 195     peek(regT1);
 196     emitPutToCallFrameHeader(regT1, RegisterFile::ReturnPC);
 197
 198     // Calling convention:      f(edi, esi, edx, ecx, ...);
 199     // Host function signature: f(ExecState*);
 200     move(callFrameRegister, X86Registers::edi);
 201
 202     subPtr(TrustedImm32(16 - sizeof(void*)), stackPointerRegister); // Align stack after call.
 203
 204     emitGetFromCallFrameHeaderPtr(RegisterFile::Callee, X86Registers::esi);
 205     loadPtr(Address(X86Registers::esi, OBJECT_OFFSETOF(JSFunction, m_executable)), X86Registers::r9);
 206     move(regT0, callFrameRegister); // Eagerly restore caller frame register to avoid loading from stack.
 207     call(Address(X86Registers::r9, executableOffsetToFunction));
 208
 209     addPtr(TrustedImm32(16 - sizeof(void*)), stackPointerRegister);
 210
 211 #elif CPU(ARM)
 212     // Load caller frame's scope chain into this callframe so that whatever we call can
 213     // get to its global data.
 214     emitGetFromCallFrameHeaderPtr(RegisterFile::CallerFrame, regT2);
 215     emitGetFromCallFrameHeaderPtr(RegisterFile::ScopeChain, regT1, regT2);
 216     emitPutCellToCallFrameHeader(regT1, RegisterFile::ScopeChain);
 217
 218     preserveReturnAddressAfterCall(regT3); // Callee preserved
 219     emitPutToCallFrameHeader(regT3, RegisterFile::ReturnPC);
 220
 221     // Calling convention:      f(r0 == regT0, r1 == regT1, ...);
 222     // Host function signature: f(ExecState*);
 223     move(callFrameRegister, ARMRegisters::r0);
 224
 225     emitGetFromCallFrameHeaderPtr(RegisterFile::Callee, ARMRegisters::r1);
 226     move(regT2, callFrameRegister); // Eagerly restore caller frame register to avoid loading from stack.
 227     loadPtr(Address(ARMRegisters::r1, OBJECT_OFFSETOF(JSFunction, m_executable)), regT2);
 228     call(Address(regT2, executableOffsetToFunction));
 229
 230     restoreReturnAddressBeforeReturn(regT3);
 231
 232 #elif CPU(MIPS)
 233     // Load caller frame's scope chain into this callframe so that whatever we call can
 234     // get to its global data.
 235     emitGetFromCallFrameHeaderPtr(RegisterFile::CallerFrame, regT0);
 236     emitGetFromCallFrameHeaderPtr(RegisterFile::ScopeChain, regT1, regT0);
 237     emitPutCellToCallFrameHeader(regT1, RegisterFile::ScopeChain);
 238
 239     preserveReturnAddressAfterCall(regT3); // Callee preserved
 240     emitPutToCallFrameHeader(regT3, RegisterFile::ReturnPC);
 241
 242     // Calling convention:      f(a0, a1, a2, a3);
 243     // Host function signature: f(ExecState*);
 244
 245     // Allocate stack space for 16 bytes (8-byte aligned)
 246     // 16 bytes (unused) for 4 arguments
 247     subPtr(TrustedImm32(16), stackPointerRegister);
 248
 249     // Setup arg0
 250     move(callFrameRegister, MIPSRegisters::a0);
 251
 252     // Call
 253     emitGetFromCallFrameHeaderPtr(RegisterFile::Callee, MIPSRegisters::a2);
 254     loadPtr(Address(MIPSRegisters::a2, OBJECT_OFFSETOF(JSFunction, m_executable)), regT2);
 255     move(regT0, callFrameRegister); // Eagerly restore caller frame register to avoid loading from stack.
 256     call(Address(regT2, executableOffsetToFunction));
 257
 258     // Restore stack space
 259     addPtr(TrustedImm32(16), stackPointerRegister);
 260
 261     restoreReturnAddressBeforeReturn(regT3);
 262
 263 #else
 264 #error "JIT not supported on this platform."
 265     UNUSED_PARAM(executableOffsetToFunction);
 266     breakpoint();
 267 #endif
 268
 269     // Check for an exception
 270     loadPtr(&(globalData->exception), regT2);
 271     Jump exceptionHandler = branchTestPtr(NonZero, regT2);
 272
 273     // Return.
 274     ret();
 275
 276     // Handle an exception
 277     exceptionHandler.link(this);
 278
 279     // Grab the return address.
 280     preserveReturnAddressAfterCall(regT1);
 281
 282     move(TrustedImmPtr(&globalData->exceptionLocation), regT2);
 283     storePtr(regT1, regT2);
 284     poke(callFrameRegister, OBJECT_OFFSETOF(struct JITStackFrame, callFrame) / sizeof(void*));
 285
 286     storePtr(callFrameRegister, &m_globalData->topCallFrame);
 287     // Set the return address.
 288     move(TrustedImmPtr(FunctionPtr(ctiVMThrowTrampoline).value()), regT1);
 289     restoreReturnAddressBeforeReturn(regT1);
 290
 291     ret();
 292
 293     return nativeCallThunk;
 294 }
 295
 296 JIT::CodeRef JIT::privateCompileCTINativeCall(JSGlobalData* globalData, NativeFunction)
 297 {
 298     return CodeRef::createSelfManagedCodeRef(globalData->jitStubs->ctiNativeCall());
 299 }
 300
 301 void JIT::emit_op_mov(Instruction* currentInstruction)
 302 {
 303     int dst = currentInstruction[1].u.operand;
 304     int src = currentInstruction[2].u.operand;
 305
 306     if (m_codeBlock->isConstantRegisterIndex(src)) {
 307         storePtr(ImmPtr(JSValue::encode(getConstantOperand(src))), Address(callFrameRegister, dst * sizeof(Register)));
 308         if (dst == m_lastResultBytecodeRegister)
 309             killLastResultRegister();
 310     } else if ((src == m_lastResultBytecodeRegister) || (dst == m_lastResultBytecodeRegister)) {
 311         // If either the src or dst is the cached register go though
 312         // get/put registers to make sure we track this correctly.
 313         emitGetVirtualRegister(src, regT0);
 314         emitPutVirtualRegister(dst);
 315     } else {
 316         // Perform the copy via regT1; do not disturb any mapping in regT0.
 317         loadPtr(Address(callFrameRegister, src * sizeof(Register)), regT1);
 318         storePtr(regT1, Address(callFrameRegister, dst * sizeof(Register)));
 319     }
 320 }
 321
 322 void JIT::emit_op_end(Instruction* currentInstruction)
 323 {
 324     ASSERT(returnValueRegister != callFrameRegister);
 325     emitGetVirtualRegister(currentInstruction[1].u.operand, returnValueRegister);
 326     restoreReturnAddressBeforeReturn(Address(callFrameRegister, RegisterFile::ReturnPC * static_cast<int>(sizeof(Register))));
 327     ret();
 328 }
 329
 330 void JIT::emit_op_jmp(Instruction* currentInstruction)
 331 {
 332     unsigned target = currentInstruction[1].u.operand;
 333     addJump(jump(), target);
 334 }
 335
 336 void JIT::emit_op_new_object(Instruction* currentInstruction)
 337 {
 338     emitAllocateJSFinalObject(ImmPtr(m_codeBlock->globalObject()->emptyObjectStructure()), regT0, regT1);
 339
 340     emitPutVirtualRegister(currentInstruction[1].u.operand);
 341 }
 342
 343 void JIT::emitSlow_op_new_object(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
 344 {
 345     linkSlowCase(iter);
 346     JITStubCall(this, cti_op_new_object).call(currentInstruction[1].u.operand);
 347 }
 348
 349 void JIT::emit_op_check_has_instance(Instruction* currentInstruction)
 350 {
 351     unsigned baseVal = currentInstruction[1].u.operand;
 352
 353     emitGetVirtualRegister(baseVal, regT0);
 354
 355     // Check that baseVal is a cell.
 356     emitJumpSlowCaseIfNotJSCell(regT0, baseVal);
 357
 358     // Check that baseVal 'ImplementsHasInstance'.
 359     loadPtr(Address(regT0, JSCell::structureOffset()), regT0);
 360     addSlowCase(branchTest8(Zero, Address(regT0, Structure::typeInfoFlagsOffset()), TrustedImm32(ImplementsHasInstance)));
 361 }
 362
 363 void JIT::emit_op_instanceof(Instruction* currentInstruction)
 364 {
 365     unsigned dst = currentInstruction[1].u.operand;
 366     unsigned value = currentInstruction[2].u.operand;
 367     unsigned baseVal = currentInstruction[3].u.operand;
 368     unsigned proto = currentInstruction[4].u.operand;
 369
 370     // Load the operands (baseVal, proto, and value respectively) into registers.
 371     // We use regT0 for baseVal since we will be done with this first, and we can then use it for the result.
 372     emitGetVirtualRegister(value, regT2);
 373     emitGetVirtualRegister(baseVal, regT0);
 374     emitGetVirtualRegister(proto, regT1);
 375
 376     // Check that proto are cells.  baseVal must be a cell - this is checked by op_check_has_instance.
 377     emitJumpSlowCaseIfNotJSCell(regT2, value);
 378     emitJumpSlowCaseIfNotJSCell(regT1, proto);
 379
 380     // Check that prototype is an object
 381     loadPtr(Address(regT1, JSCell::structureOffset()), regT3);
 382     addSlowCase(emitJumpIfNotObject(regT3));
 383
 384     // Fixme: this check is only needed because the JSC API allows HasInstance to be overridden; we should deprecate this.
 385     // Check that baseVal 'ImplementsDefaultHasInstance'.
 386     loadPtr(Address(regT0, JSCell::structureOffset()), regT0);
 387     addSlowCase(branchTest8(Zero, Address(regT0, Structure::typeInfoFlagsOffset()), TrustedImm32(ImplementsDefaultHasInstance)));
 388
 389     // Optimistically load the result true, and start looping.
 390     // Initially, regT1 still contains proto and regT2 still contains value.
 391     // As we loop regT2 will be updated with its prototype, recursively walking the prototype chain.
 392     move(TrustedImmPtr(JSValue::encode(jsBoolean(true))), regT0);
 393     Label loop(this);
 394
 395     // Load the prototype of the object in regT2.  If this is equal to regT1 - WIN!
 396     // Otherwise, check if we've hit null - if we have then drop out of the loop, if not go again.
 397     loadPtr(Address(regT2, JSCell::structureOffset()), regT2);
 398     loadPtr(Address(regT2, Structure::prototypeOffset()), regT2);
 399     Jump isInstance = branchPtr(Equal, regT2, regT1);
 400     emitJumpIfJSCell(regT2).linkTo(loop, this);
 401
 402     // We get here either by dropping out of the loop, or if value was not an Object.  Result is false.
 403     move(TrustedImmPtr(JSValue::encode(jsBoolean(false))), regT0);
 404
 405     // isInstance jumps right down to here, to skip setting the result to false (it has already set true).
 406     isInstance.link(this);
 407     emitPutVirtualRegister(dst);
 408 }
 409
 410 void JIT::emit_op_call(Instruction* currentInstruction)
 411 {
 412     compileOpCall(op_call, currentInstruction, m_callLinkInfoIndex++);
 413 }
 414
 415 void JIT::emit_op_call_eval(Instruction* currentInstruction)
 416 {
 417     compileOpCall(op_call_eval, currentInstruction, m_callLinkInfoIndex++);
 418 }
 419
 420 void JIT::emit_op_call_varargs(Instruction* currentInstruction)
 421 {
 422     compileOpCallVarargs(currentInstruction);
 423 }
 424
 425 void JIT::emit_op_construct(Instruction* currentInstruction)
 426 {
 427     compileOpCall(op_construct, currentInstruction, m_callLinkInfoIndex++);
 428 }
 429
 430 void JIT::emit_op_tear_off_activation(Instruction* currentInstruction)
 431 {
 432     unsigned activation = currentInstruction[1].u.operand;
 433     unsigned arguments = currentInstruction[2].u.operand;
 434     Jump activationCreated = branchTestPtr(NonZero, addressFor(activation));
 435     Jump argumentsNotCreated = branchTestPtr(Zero, addressFor(arguments));
 436     activationCreated.link(this);
 437     JITStubCall stubCall(this, cti_op_tear_off_activation);
 438     stubCall.addArgument(activation, regT2);
 439     stubCall.addArgument(unmodifiedArgumentsRegister(arguments), regT2);
 440     stubCall.call();
 441     argumentsNotCreated.link(this);
 442 }
 443
 444 void JIT::emit_op_tear_off_arguments(Instruction* currentInstruction)
 445 {
 446     unsigned dst = currentInstruction[1].u.operand;
 447
 448     Jump argsNotCreated = branchTestPtr(Zero, Address(callFrameRegister, sizeof(Register) * (unmodifiedArgumentsRegister(dst))));
 449     JITStubCall stubCall(this, cti_op_tear_off_arguments);
 450     stubCall.addArgument(unmodifiedArgumentsRegister(dst), regT2);
 451     stubCall.call();
 452     argsNotCreated.link(this);
 453 }
 454
 455 void JIT::emit_op_ret(Instruction* currentInstruction)
 456 {
 457     emitOptimizationCheck(RetOptimizationCheck);
 458
 459     ASSERT(callFrameRegister != regT1);
 460     ASSERT(regT1 != returnValueRegister);
 461     ASSERT(returnValueRegister != callFrameRegister);
 462
 463     // Return the result in %eax.
 464     emitGetVirtualRegister(currentInstruction[1].u.operand, returnValueRegister);
 465
 466     // Grab the return address.
 467     emitGetFromCallFrameHeaderPtr(RegisterFile::ReturnPC, regT1);
 468
 469     // Restore our caller's "r".
 470     emitGetFromCallFrameHeaderPtr(RegisterFile::CallerFrame, callFrameRegister);
 471
 472     // Return.
 473     restoreReturnAddressBeforeReturn(regT1);
 474     ret();
 475 }
 476
 477 void JIT::emit_op_ret_object_or_this(Instruction* currentInstruction)
 478 {
 479     emitOptimizationCheck(RetOptimizationCheck);
 480
 481     ASSERT(callFrameRegister != regT1);
 482     ASSERT(regT1 != returnValueRegister);
 483     ASSERT(returnValueRegister != callFrameRegister);
 484
 485     // Return the result in %eax.
 486     emitGetVirtualRegister(currentInstruction[1].u.operand, returnValueRegister);
 487     Jump notJSCell = emitJumpIfNotJSCell(returnValueRegister);
 488     loadPtr(Address(returnValueRegister, JSCell::structureOffset()), regT2);
 489     Jump notObject = emitJumpIfNotObject(regT2);
 490
 491     // Grab the return address.
 492     emitGetFromCallFrameHeaderPtr(RegisterFile::ReturnPC, regT1);
 493
 494     // Restore our caller's "r".
 495     emitGetFromCallFrameHeaderPtr(RegisterFile::CallerFrame, callFrameRegister);
 496
 497     // Return.
 498     restoreReturnAddressBeforeReturn(regT1);
 499     ret();
 500
 501     // Return 'this' in %eax.
 502     notJSCell.link(this);
 503     notObject.link(this);
 504     emitGetVirtualRegister(currentInstruction[2].u.operand, returnValueRegister);
 505
 506     // Grab the return address.
 507     emitGetFromCallFrameHeaderPtr(RegisterFile::ReturnPC, regT1);
 508
 509     // Restore our caller's "r".
 510     emitGetFromCallFrameHeaderPtr(RegisterFile::CallerFrame, callFrameRegister);
 511
 512     // Return.
 513     restoreReturnAddressBeforeReturn(regT1);
 514     ret();
 515 }
 516
 517 void JIT::emit_op_resolve(Instruction* currentInstruction)
 518 {
 519     JITStubCall stubCall(this, cti_op_resolve);
 520     stubCall.addArgument(TrustedImmPtr(&m_codeBlock->identifier(currentInstruction[2].u.operand)));
 521     stubCall.call(currentInstruction[1].u.operand);
 522 }
 523
 524 void JIT::emit_op_to_primitive(Instruction* currentInstruction)
 525 {
 526     int dst = currentInstruction[1].u.operand;
 527     int src = currentInstruction[2].u.operand;
 528
 529     emitGetVirtualRegister(src, regT0);
 530
 531     Jump isImm = emitJumpIfNotJSCell(regT0);
 532     addSlowCase(branchPtr(NotEqual, Address(regT0), TrustedImmPtr(m_globalData->jsStringVPtr)));
 533     isImm.link(this);
 534
 535     if (dst != src)
 536         emitPutVirtualRegister(dst);
 537
 538 }
 539
 540 void JIT::emit_op_strcat(Instruction* currentInstruction)
 541 {
 542     JITStubCall stubCall(this, cti_op_strcat);
 543     stubCall.addArgument(Imm32(currentInstruction[2].u.operand));
 544     stubCall.addArgument(Imm32(currentInstruction[3].u.operand));
 545     stubCall.call(currentInstruction[1].u.operand);
 546 }
 547
 548 void JIT::emit_op_resolve_base(Instruction* currentInstruction)
 549 {
 550     JITStubCall stubCall(this, currentInstruction[3].u.operand ? cti_op_resolve_base_strict_put : cti_op_resolve_base);
 551     stubCall.addArgument(TrustedImmPtr(&m_codeBlock->identifier(currentInstruction[2].u.operand)));
 552     stubCall.call(currentInstruction[1].u.operand);
 553 }
 554
 555 void JIT::emit_op_ensure_property_exists(Instruction* currentInstruction)
 556 {
 557     JITStubCall stubCall(this, cti_op_ensure_property_exists);
 558     stubCall.addArgument(Imm32(currentInstruction[1].u.operand));
 559     stubCall.addArgument(TrustedImmPtr(&m_codeBlock->identifier(currentInstruction[2].u.operand)));
 560     stubCall.call(currentInstruction[1].u.operand);
 561 }
 562
 563 void JIT::emit_op_resolve_skip(Instruction* currentInstruction)
 564 {
 565     JITStubCall stubCall(this, cti_op_resolve_skip);
 566     stubCall.addArgument(TrustedImmPtr(&m_codeBlock->identifier(currentInstruction[2].u.operand)));
 567     stubCall.addArgument(Imm32(currentInstruction[3].u.operand));
 568     stubCall.call(currentInstruction[1].u.operand);
 569 }
 570
 571 void JIT::emit_op_resolve_global(Instruction* currentInstruction, bool)
 572 {
 573     // Fast case
 574     void* globalObject = m_codeBlock->globalObject();
 575     unsigned currentIndex = m_globalResolveInfoIndex++;
 576     GlobalResolveInfo* resolveInfoAddress = &(m_codeBlock->globalResolveInfo(currentIndex));
 577
 578     // Check Structure of global object
 579     move(TrustedImmPtr(globalObject), regT0);
 580     move(TrustedImmPtr(resolveInfoAddress), regT2);
 581     loadPtr(Address(regT2, OBJECT_OFFSETOF(GlobalResolveInfo, structure)), regT1);
 582     addSlowCase(branchPtr(NotEqual, regT1, Address(regT0, JSCell::structureOffset()))); // Structures don't match
 583
 584     // Load cached property
 585     // Assume that the global object always uses external storage.
 586     loadPtr(Address(regT0, OBJECT_OFFSETOF(JSGlobalObject, m_propertyStorage)), regT0);
 587     load32(Address(regT2, OBJECT_OFFSETOF(GlobalResolveInfo, offset)), regT1);
 588     loadPtr(BaseIndex(regT0, regT1, ScalePtr), regT0);
 589     emitPutVirtualRegister(currentInstruction[1].u.operand);
 590 }
 591
 592 void JIT::emitSlow_op_resolve_global(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
 593 {
 594     unsigned dst = currentInstruction[1].u.operand;
 595     Identifier* ident = &m_codeBlock->identifier(currentInstruction[2].u.operand);
 596
 597     unsigned currentIndex = m_globalResolveInfoIndex++;
 598
 599     linkSlowCase(iter);
 600     JITStubCall stubCall(this, cti_op_resolve_global);
 601     stubCall.addArgument(TrustedImmPtr(ident));
 602     stubCall.addArgument(Imm32(currentIndex));
 603     stubCall.addArgument(regT0);
 604     stubCall.call(dst);
 605 }
 606
 607 void JIT::emit_op_not(Instruction* currentInstruction)
 608 {
 609     emitGetVirtualRegister(currentInstruction[2].u.operand, regT0);
 610
 611     // Invert against JSValue(false); if the value was tagged as a boolean, then all bits will be
 612     // clear other than the low bit (which will be 0 or 1 for false or true inputs respectively).
 613     // Then invert against JSValue(true), which will add the tag back in, and flip the low bit.
 614     xorPtr(TrustedImm32(static_cast<int32_t>(ValueFalse)), regT0);
 615     addSlowCase(branchTestPtr(NonZero, regT0, TrustedImm32(static_cast<int32_t>(~1))));
 616     xorPtr(TrustedImm32(static_cast<int32_t>(ValueTrue)), regT0);
 617
 618     emitPutVirtualRegister(currentInstruction[1].u.operand);
 619 }
 620
 621 void JIT::emit_op_jfalse(Instruction* currentInstruction)
 622 {
 623     unsigned target = currentInstruction[2].u.operand;
 624     emitGetVirtualRegister(currentInstruction[1].u.operand, regT0);
 625
 626     addJump(branchPtr(Equal, regT0, TrustedImmPtr(JSValue::encode(jsNumber(0)))), target);
 627     Jump isNonZero = emitJumpIfImmediateInteger(regT0);
 628
 629     addJump(branchPtr(Equal, regT0, TrustedImmPtr(JSValue::encode(jsBoolean(false)))), target);
 630     addSlowCase(branchPtr(NotEqual, regT0, TrustedImmPtr(JSValue::encode(jsBoolean(true)))));
 631
 632     isNonZero.link(this);
 633 }
 634
 635 void JIT::emit_op_jeq_null(Instruction* currentInstruction)
 636 {
 637     unsigned src = currentInstruction[1].u.operand;
 638     unsigned target = currentInstruction[2].u.operand;
 639
 640     emitGetVirtualRegister(src, regT0);
 641     Jump isImmediate = emitJumpIfNotJSCell(regT0);
 642
 643     // First, handle JSCell cases - check MasqueradesAsUndefined bit on the structure.
 644     loadPtr(Address(regT0, JSCell::structureOffset()), regT2);
 645     addJump(branchTest8(NonZero, Address(regT2, Structure::typeInfoFlagsOffset()), TrustedImm32(MasqueradesAsUndefined)), target);
 646     Jump wasNotImmediate = jump();
 647
 648     // Now handle the immediate cases - undefined & null
 649     isImmediate.link(this);
 650     andPtr(TrustedImm32(~TagBitUndefined), regT0);
 651     addJump(branchPtr(Equal, regT0, TrustedImmPtr(JSValue::encode(jsNull()))), target);
 652
 653     wasNotImmediate.link(this);
 654 };
 655 void JIT::emit_op_jneq_null(Instruction* currentInstruction)
 656 {
 657     unsigned src = currentInstruction[1].u.operand;
 658     unsigned target = currentInstruction[2].u.operand;
 659
 660     emitGetVirtualRegister(src, regT0);
 661     Jump isImmediate = emitJumpIfNotJSCell(regT0);
 662
 663     // First, handle JSCell cases - check MasqueradesAsUndefined bit on the structure.
 664     loadPtr(Address(regT0, JSCell::structureOffset()), regT2);
 665     addJump(branchTest8(Zero, Address(regT2, Structure::typeInfoFlagsOffset()), TrustedImm32(MasqueradesAsUndefined)), target);
 666     Jump wasNotImmediate = jump();
 667
 668     // Now handle the immediate cases - undefined & null
 669     isImmediate.link(this);
 670     andPtr(TrustedImm32(~TagBitUndefined), regT0);
 671     addJump(branchPtr(NotEqual, regT0, TrustedImmPtr(JSValue::encode(jsNull()))), target);
 672
 673     wasNotImmediate.link(this);
 674 }
 675
 676 void JIT::emit_op_jneq_ptr(Instruction* currentInstruction)
 677 {
 678     unsigned src = currentInstruction[1].u.operand;
 679     JSCell* ptr = currentInstruction[2].u.jsCell.get();
 680     unsigned target = currentInstruction[3].u.operand;
 681
 682     emitGetVirtualRegister(src, regT0);
 683     addJump(branchPtr(NotEqual, regT0, TrustedImmPtr(JSValue::encode(JSValue(ptr)))), target);
 684 }
 685
 686 void JIT::emit_op_jsr(Instruction* currentInstruction)
 687 {
 688     int retAddrDst = currentInstruction[1].u.operand;
 689     int target = currentInstruction[2].u.operand;
 690     DataLabelPtr storeLocation = storePtrWithPatch(TrustedImmPtr(0), Address(callFrameRegister, sizeof(Register) * retAddrDst));
 691     addJump(jump(), target);
 692     m_jsrSites.append(JSRInfo(storeLocation, label()));
 693     killLastResultRegister();
 694 }
 695
 696 void JIT::emit_op_sret(Instruction* currentInstruction)
 697 {
 698     jump(Address(callFrameRegister, sizeof(Register) * currentInstruction[1].u.operand));
 699     killLastResultRegister();
 700 }
 701
 702 void JIT::emit_op_eq(Instruction* currentInstruction)
 703 {
 704     emitGetVirtualRegisters(currentInstruction[2].u.operand, regT0, currentInstruction[3].u.operand, regT1);
 705     emitJumpSlowCaseIfNotImmediateIntegers(regT0, regT1, regT2);
 706     compare32(Equal, regT1, regT0, regT0);
 707     emitTagAsBoolImmediate(regT0);
 708     emitPutVirtualRegister(currentInstruction[1].u.operand);
 709 }
 710
 711 void JIT::emit_op_bitnot(Instruction* currentInstruction)
 712 {
 713     emitGetVirtualRegister(currentInstruction[2].u.operand, regT0);
 714     emitJumpSlowCaseIfNotImmediateInteger(regT0);
 715     not32(regT0);
 716     emitFastArithIntToImmNoCheck(regT0, regT0);
 717     emitPutVirtualRegister(currentInstruction[1].u.operand);
 718 }
 719
 720 void JIT::emit_op_resolve_with_base(Instruction* currentInstruction)
 721 {
 722     JITStubCall stubCall(this, cti_op_resolve_with_base);
 723     stubCall.addArgument(TrustedImmPtr(&m_codeBlock->identifier(currentInstruction[3].u.operand)));
 724     stubCall.addArgument(Imm32(currentInstruction[1].u.operand));
 725     stubCall.call(currentInstruction[2].u.operand);
 726 }
 727
 728 void JIT::emit_op_resolve_with_this(Instruction* currentInstruction)
 729 {
 730     JITStubCall stubCall(this, cti_op_resolve_with_this);
 731     stubCall.addArgument(TrustedImmPtr(&m_codeBlock->identifier(currentInstruction[3].u.operand)));
 732     stubCall.addArgument(Imm32(currentInstruction[1].u.operand));
 733     stubCall.call(currentInstruction[2].u.operand);
 734 }
 735
 736 void JIT::emit_op_jtrue(Instruction* currentInstruction)
 737 {
 738     unsigned target = currentInstruction[2].u.operand;
 739     emitGetVirtualRegister(currentInstruction[1].u.operand, regT0);
 740
 741     Jump isZero = branchPtr(Equal, regT0, TrustedImmPtr(JSValue::encode(jsNumber(0))));
 742     addJump(emitJumpIfImmediateInteger(regT0), target);
 743
 744     addJump(branchPtr(Equal, regT0, TrustedImmPtr(JSValue::encode(jsBoolean(true)))), target);
 745     addSlowCase(branchPtr(NotEqual, regT0, TrustedImmPtr(JSValue::encode(jsBoolean(false)))));
 746
 747     isZero.link(this);
 748 }
 749
 750 void JIT::emit_op_neq(Instruction* currentInstruction)
 751 {
 752     emitGetVirtualRegisters(currentInstruction[2].u.operand, regT0, currentInstruction[3].u.operand, regT1);
 753     emitJumpSlowCaseIfNotImmediateIntegers(regT0, regT1, regT2);
 754     compare32(NotEqual, regT1, regT0, regT0);
 755     emitTagAsBoolImmediate(regT0);
 756
 757     emitPutVirtualRegister(currentInstruction[1].u.operand);
 758
 759 }
 760
 761 void JIT::emit_op_bitxor(Instruction* currentInstruction)
 762 {
 763     emitGetVirtualRegisters(currentInstruction[2].u.operand, regT0, currentInstruction[3].u.operand, regT1);
 764     emitJumpSlowCaseIfNotImmediateIntegers(regT0, regT1, regT2);
 765     xorPtr(regT1, regT0);
 766     emitFastArithReTagImmediate(regT0, regT0);
 767     emitPutVirtualRegister(currentInstruction[1].u.operand);
 768 }
 769
 770 void JIT::emit_op_bitor(Instruction* currentInstruction)
 771 {
 772     emitGetVirtualRegisters(currentInstruction[2].u.operand, regT0, currentInstruction[3].u.operand, regT1);
 773     emitJumpSlowCaseIfNotImmediateIntegers(regT0, regT1, regT2);
 774     orPtr(regT1, regT0);
 775     emitPutVirtualRegister(currentInstruction[1].u.operand);
 776 }
 777
 778 void JIT::emit_op_throw(Instruction* currentInstruction)
 779 {
 780     JITStubCall stubCall(this, cti_op_throw);
 781     stubCall.addArgument(currentInstruction[1].u.operand, regT2);
 782     stubCall.call();
 783     ASSERT(regT0 == returnValueRegister);
 784 #ifndef NDEBUG
 785     // cti_op_throw always changes it's return address,
 786     // this point in the code should never be reached.
 787     breakpoint();
 788 #endif
 789 }
 790
 791 void JIT::emit_op_get_pnames(Instruction* currentInstruction)
 792 {
 793     int dst = currentInstruction[1].u.operand;
 794     int base = currentInstruction[2].u.operand;
 795     int i = currentInstruction[3].u.operand;
 796     int size = currentInstruction[4].u.operand;
 797     int breakTarget = currentInstruction[5].u.operand;
 798
 799     JumpList isNotObject;
 800
 801     emitGetVirtualRegister(base, regT0);
 802     if (!m_codeBlock->isKnownNotImmediate(base))
 803         isNotObject.append(emitJumpIfNotJSCell(regT0));
 804     if (base != m_codeBlock->thisRegister() || m_codeBlock->isStrictMode()) {
 805         loadPtr(Address(regT0, JSCell::structureOffset()), regT2);
 806         isNotObject.append(emitJumpIfNotObject(regT2));
 807     }
 808
 809     // We could inline the case where you have a valid cache, but
 810     // this call doesn't seem to be hot.
 811     Label isObject(this);
 812     JITStubCall getPnamesStubCall(this, cti_op_get_pnames);
 813     getPnamesStubCall.addArgument(regT0);
 814     getPnamesStubCall.call(dst);
 815     load32(Address(regT0, OBJECT_OFFSETOF(JSPropertyNameIterator, m_jsStringsSize)), regT3);
 816     storePtr(tagTypeNumberRegister, payloadFor(i));
 817     store32(TrustedImm32(Int32Tag), intTagFor(size));
 818     store32(regT3, intPayloadFor(size));
 819     Jump end = jump();
 820
 821     isNotObject.link(this);
 822     move(regT0, regT1);
 823     and32(TrustedImm32(~TagBitUndefined), regT1);
 824     addJump(branch32(Equal, regT1, TrustedImm32(ValueNull)), breakTarget);
 825
 826     JITStubCall toObjectStubCall(this, cti_to_object);
 827     toObjectStubCall.addArgument(regT0);
 828     toObjectStubCall.call(base);
 829     jump().linkTo(isObject, this);
 830
 831     end.link(this);
 832 }
 833
 834 void JIT::emit_op_next_pname(Instruction* currentInstruction)
 835 {
 836     int dst = currentInstruction[1].u.operand;
 837     int base = currentInstruction[2].u.operand;
 838     int i = currentInstruction[3].u.operand;
 839     int size = currentInstruction[4].u.operand;
 840     int it = currentInstruction[5].u.operand;
 841     int target = currentInstruction[6].u.operand;
 842
 843     JumpList callHasProperty;
 844
 845     Label begin(this);
 846     load32(intPayloadFor(i), regT0);
 847     Jump end = branch32(Equal, regT0, intPayloadFor(size));
 848
 849     // Grab key @ i
 850     loadPtr(addressFor(it), regT1);
 851     loadPtr(Address(regT1, OBJECT_OFFSETOF(JSPropertyNameIterator, m_jsStrings)), regT2);
 852
 853     loadPtr(BaseIndex(regT2, regT0, TimesEight), regT2);
 854
 855     emitPutVirtualRegister(dst, regT2);
 856
 857     // Increment i
 858     add32(TrustedImm32(1), regT0);
 859     store32(regT0, intPayloadFor(i));
 860
 861     // Verify that i is valid:
 862     emitGetVirtualRegister(base, regT0);
 863
 864     // Test base's structure
 865     loadPtr(Address(regT0, JSCell::structureOffset()), regT2);
 866     callHasProperty.append(branchPtr(NotEqual, regT2, Address(Address(regT1, OBJECT_OFFSETOF(JSPropertyNameIterator, m_cachedStructure)))));
 867
 868     // Test base's prototype chain
 869     loadPtr(Address(Address(regT1, OBJECT_OFFSETOF(JSPropertyNameIterator, m_cachedPrototypeChain))), regT3);
 870     loadPtr(Address(regT3, OBJECT_OFFSETOF(StructureChain, m_vector)), regT3);
 871     addJump(branchTestPtr(Zero, Address(regT3)), target);
 872
 873     Label checkPrototype(this);
 874     loadPtr(Address(regT2, Structure::prototypeOffset()), regT2);
 875     callHasProperty.append(emitJumpIfNotJSCell(regT2));
 876     loadPtr(Address(regT2, JSCell::structureOffset()), regT2);
 877     callHasProperty.append(branchPtr(NotEqual, regT2, Address(regT3)));
 878     addPtr(TrustedImm32(sizeof(Structure*)), regT3);
 879     branchTestPtr(NonZero, Address(regT3)).linkTo(checkPrototype, this);
 880
 881     // Continue loop.
 882     addJump(jump(), target);
 883
 884     // Slow case: Ask the object if i is valid.
 885     callHasProperty.link(this);
 886     emitGetVirtualRegister(dst, regT1);
 887     JITStubCall stubCall(this, cti_has_property);
 888     stubCall.addArgument(regT0);
 889     stubCall.addArgument(regT1);
 890     stubCall.call();
 891
 892     // Test for valid key.
 893     addJump(branchTest32(NonZero, regT0), target);
 894     jump().linkTo(begin, this);
 895
 896     // End of loop.
 897     end.link(this);
 898 }
 899
 900 void JIT::emit_op_push_scope(Instruction* currentInstruction)
 901 {
 902     JITStubCall stubCall(this, cti_op_push_scope);
 903     stubCall.addArgument(currentInstruction[1].u.operand, regT2);
 904     stubCall.call(currentInstruction[1].u.operand);
 905 }
 906
 907 void JIT::emit_op_pop_scope(Instruction*)
 908 {
 909     JITStubCall(this, cti_op_pop_scope).call();
 910 }
 911
 912 void JIT::compileOpStrictEq(Instruction* currentInstruction, CompileOpStrictEqType type)
 913 {
 914     unsigned dst = currentInstruction[1].u.operand;
 915     unsigned src1 = currentInstruction[2].u.operand;
 916     unsigned src2 = currentInstruction[3].u.operand;
 917
 918     emitGetVirtualRegisters(src1, regT0, src2, regT1);
 919
 920     // Jump to a slow case if either operand is a number, or if both are JSCell*s.
 921     move(regT0, regT2);
 922     orPtr(regT1, regT2);
 923     addSlowCase(emitJumpIfJSCell(regT2));
 924     addSlowCase(emitJumpIfImmediateNumber(regT2));
 925
 926     if (type == OpStrictEq)
 927         compare32(Equal, regT1, regT0, regT0);
 928     else
 929         compare32(NotEqual, regT1, regT0, regT0);
 930     emitTagAsBoolImmediate(regT0);
 931
 932     emitPutVirtualRegister(dst);
 933 }
 934
 935 void JIT::emit_op_stricteq(Instruction* currentInstruction)
 936 {
 937     compileOpStrictEq(currentInstruction, OpStrictEq);
 938 }
 939
 940 void JIT::emit_op_nstricteq(Instruction* currentInstruction)
 941 {
 942     compileOpStrictEq(currentInstruction, OpNStrictEq);
 943 }
 944
 945 void JIT::emit_op_to_jsnumber(Instruction* currentInstruction)
 946 {
 947     int srcVReg = currentInstruction[2].u.operand;
 948     emitGetVirtualRegister(srcVReg, regT0);
 949
 950     Jump wasImmediate = emitJumpIfImmediateInteger(regT0);
 951
 952     emitJumpSlowCaseIfNotJSCell(regT0, srcVReg);
 953     loadPtr(Address(regT0, JSCell::structureOffset()), regT2);
 954     addSlowCase(branch8(NotEqual, Address(regT2, Structure::typeInfoTypeOffset()), TrustedImm32(NumberType)));
 955
 956     wasImmediate.link(this);
 957
 958     emitPutVirtualRegister(currentInstruction[1].u.operand);
 959 }
 960
 961 void JIT::emit_op_push_new_scope(Instruction* currentInstruction)
 962 {
 963     JITStubCall stubCall(this, cti_op_push_new_scope);
 964     stubCall.addArgument(TrustedImmPtr(&m_codeBlock->identifier(currentInstruction[2].u.operand)));
 965     stubCall.addArgument(currentInstruction[3].u.operand, regT2);
 966     stubCall.call(currentInstruction[1].u.operand);
 967 }
 968
 969 void JIT::emit_op_catch(Instruction* currentInstruction)
 970 {
 971     killLastResultRegister(); // FIXME: Implicitly treat op_catch as a labeled statement, and remove this line of code.
 972     move(regT0, callFrameRegister);
 973     peek(regT3, OBJECT_OFFSETOF(struct JITStackFrame, globalData) / sizeof(void*));
 974     loadPtr(Address(regT3, OBJECT_OFFSETOF(JSGlobalData, exception)), regT0);
 975     storePtr(TrustedImmPtr(JSValue::encode(JSValue())), Address(regT3, OBJECT_OFFSETOF(JSGlobalData, exception)));
 976     emitPutVirtualRegister(currentInstruction[1].u.operand);
 977 }
 978
 979 void JIT::emit_op_jmp_scopes(Instruction* currentInstruction)
 980 {
 981     JITStubCall stubCall(this, cti_op_jmp_scopes);
 982     stubCall.addArgument(Imm32(currentInstruction[1].u.operand));
 983     stubCall.call();
 984     addJump(jump(), currentInstruction[2].u.operand);
 985 }
 986
 987 void JIT::emit_op_switch_imm(Instruction* currentInstruction)
 988 {
 989     unsigned tableIndex = currentInstruction[1].u.operand;
 990     unsigned defaultOffset = currentInstruction[2].u.operand;
 991     unsigned scrutinee = currentInstruction[3].u.operand;
 992
 993     // create jump table for switch destinations, track this switch statement.
 994     SimpleJumpTable* jumpTable = &m_codeBlock->immediateSwitchJumpTable(tableIndex);
 995     m_switches.append(SwitchRecord(jumpTable, m_bytecodeOffset, defaultOffset, SwitchRecord::Immediate));
 996     jumpTable->ctiOffsets.grow(jumpTable->branchOffsets.size());
 997
 998     JITStubCall stubCall(this, cti_op_switch_imm);
 999     stubCall.addArgument(scrutinee, regT2);
1000     stubCall.addArgument(Imm32(tableIndex));
1001     stubCall.call();
1002     jump(regT0);
1003 }
1004
1005 void JIT::emit_op_switch_char(Instruction* currentInstruction)
1006 {
1007     unsigned tableIndex = currentInstruction[1].u.operand;
1008     unsigned defaultOffset = currentInstruction[2].u.operand;
1009     unsigned scrutinee = currentInstruction[3].u.operand;
1010
1011     // create jump table for switch destinations, track this switch statement.
1012     SimpleJumpTable* jumpTable = &m_codeBlock->characterSwitchJumpTable(tableIndex);
1013     m_switches.append(SwitchRecord(jumpTable, m_bytecodeOffset, defaultOffset, SwitchRecord::Character));
1014     jumpTable->ctiOffsets.grow(jumpTable->branchOffsets.size());
1015
1016     JITStubCall stubCall(this, cti_op_switch_char);
1017     stubCall.addArgument(scrutinee, regT2);
1018     stubCall.addArgument(Imm32(tableIndex));
1019     stubCall.call();
1020     jump(regT0);
1021 }
1022
1023 void JIT::emit_op_switch_string(Instruction* currentInstruction)
1024 {
1025     unsigned tableIndex = currentInstruction[1].u.operand;
1026     unsigned defaultOffset = currentInstruction[2].u.operand;
1027     unsigned scrutinee = currentInstruction[3].u.operand;
1028
1029     // create jump table for switch destinations, track this switch statement.
1030     StringJumpTable* jumpTable = &m_codeBlock->stringSwitchJumpTable(tableIndex);
1031     m_switches.append(SwitchRecord(jumpTable, m_bytecodeOffset, defaultOffset));
1032
1033     JITStubCall stubCall(this, cti_op_switch_string);
1034     stubCall.addArgument(scrutinee, regT2);
1035     stubCall.addArgument(Imm32(tableIndex));
1036     stubCall.call();
1037     jump(regT0);
1038 }
1039
1040 void JIT::emit_op_throw_reference_error(Instruction* currentInstruction)
1041 {
1042     JITStubCall stubCall(this, cti_op_throw_reference_error);
1043     stubCall.addArgument(ImmPtr(JSValue::encode(m_codeBlock->getConstant(currentInstruction[1].u.operand))));
1044     stubCall.call();
1045 }
1046
1047 void JIT::emit_op_debug(Instruction* currentInstruction)
1048 {
1049 #if ENABLE(DEBUG_WITH_BREAKPOINT)
1050     UNUSED_PARAM(currentInstruction);
1051     breakpoint();
1052 #else
1053     JITStubCall stubCall(this, cti_op_debug);
1054     stubCall.addArgument(Imm32(currentInstruction[1].u.operand));
1055     stubCall.addArgument(Imm32(currentInstruction[2].u.operand));
1056     stubCall.addArgument(Imm32(currentInstruction[3].u.operand));
1057     stubCall.call();
1058 #endif
1059 }
1060
1061 void JIT::emit_op_eq_null(Instruction* currentInstruction)
1062 {
1063     unsigned dst = currentInstruction[1].u.operand;
1064     unsigned src1 = currentInstruction[2].u.operand;
1065
1066     emitGetVirtualRegister(src1, regT0);
1067     Jump isImmediate = emitJumpIfNotJSCell(regT0);
1068
1069     loadPtr(Address(regT0, JSCell::structureOffset()), regT2);
1070     test8(NonZero, Address(regT2, Structure::typeInfoFlagsOffset()), TrustedImm32(MasqueradesAsUndefined), regT0);
1071
1072     Jump wasNotImmediate = jump();
1073
1074     isImmediate.link(this);
1075
1076     andPtr(TrustedImm32(~TagBitUndefined), regT0);
1077     comparePtr(Equal, regT0, TrustedImm32(ValueNull), regT0);
1078
1079     wasNotImmediate.link(this);
1080
1081     emitTagAsBoolImmediate(regT0);
1082     emitPutVirtualRegister(dst);
1083
1084 }
1085
1086 void JIT::emit_op_neq_null(Instruction* currentInstruction)
1087 {
1088     unsigned dst = currentInstruction[1].u.operand;
1089     unsigned src1 = currentInstruction[2].u.operand;
1090
1091     emitGetVirtualRegister(src1, regT0);
1092     Jump isImmediate = emitJumpIfNotJSCell(regT0);
1093
1094     loadPtr(Address(regT0, JSCell::structureOffset()), regT2);
1095     test8(Zero, Address(regT2, Structure::typeInfoFlagsOffset()), TrustedImm32(MasqueradesAsUndefined), regT0);
1096
1097     Jump wasNotImmediate = jump();
1098
1099     isImmediate.link(this);
1100
1101     andPtr(TrustedImm32(~TagBitUndefined), regT0);
1102     comparePtr(NotEqual, regT0, TrustedImm32(ValueNull), regT0);
1103
1104     wasNotImmediate.link(this);
1105
1106     emitTagAsBoolImmediate(regT0);
1107     emitPutVirtualRegister(dst);
1108 }
1109
1110 void JIT::emit_op_enter(Instruction*)
1111 {
1112     // Even though CTI doesn't use them, we initialize our constant
1113     // registers to zap stale pointers, to avoid unnecessarily prolonging
1114     // object lifetime and increasing GC pressure.
1115     size_t count = m_codeBlock->m_numVars;
1116     for (size_t j = 0; j < count; ++j)
1117         emitInitRegister(j);
1118
1119 }
1120
1121 void JIT::emit_op_create_activation(Instruction* currentInstruction)
1122 {
1123     unsigned dst = currentInstruction[1].u.operand;
1124
1125     Jump activationCreated = branchTestPtr(NonZero, Address(callFrameRegister, sizeof(Register) * dst));
1126     JITStubCall(this, cti_op_push_activation).call(currentInstruction[1].u.operand);
1127     emitPutVirtualRegister(dst);
1128     activationCreated.link(this);
1129 }
1130
1131 void JIT::emit_op_create_arguments(Instruction* currentInstruction)
1132 {
1133     unsigned dst = currentInstruction[1].u.operand;
1134
1135     Jump argsCreated = branchTestPtr(NonZero, Address(callFrameRegister, sizeof(Register) * dst));
1136     if (m_codeBlock->m_numParameters == 1)
1137         JITStubCall(this, cti_op_create_arguments_no_params).call();
1138     else
1139         JITStubCall(this, cti_op_create_arguments).call();
1140     emitPutVirtualRegister(dst);
1141     emitPutVirtualRegister(unmodifiedArgumentsRegister(dst));
1142     argsCreated.link(this);
1143 }
1144
1145 void JIT::emit_op_init_lazy_reg(Instruction* currentInstruction)
1146 {
1147     unsigned dst = currentInstruction[1].u.operand;
1148
1149     storePtr(TrustedImmPtr(0), Address(callFrameRegister, sizeof(Register) * dst));
1150 }
1151
1152 void JIT::emit_op_convert_this(Instruction* currentInstruction)
1153 {
1154     emitGetVirtualRegister(currentInstruction[1].u.operand, regT0);
1155
1156     emitJumpSlowCaseIfNotJSCell(regT0);
1157     addSlowCase(branchPtr(Equal, Address(regT0), TrustedImmPtr(m_globalData->jsStringVPtr)));
1158 }
1159
1160 void JIT::emit_op_get_callee(Instruction* currentInstruction)
1161 {
1162     unsigned result = currentInstruction[1].u.operand;
1163     emitGetFromCallFrameHeaderPtr(RegisterFile::Callee, regT0);
1164     emitPutVirtualRegister(result);
1165 }
1166
1167 void JIT::emit_op_create_this(Instruction* currentInstruction)
1168 {
1169     emitGetVirtualRegister(currentInstruction[2].u.operand, regT2);
1170     emitJumpSlowCaseIfNotJSCell(regT2, currentInstruction[2].u.operand);
1171     loadPtr(Address(regT2, JSCell::structureOffset()), regT1);
1172     addSlowCase(emitJumpIfNotObject(regT1));
1173
1174     // now we know that the prototype is an object, but we don't know if it's got an
1175     // inheritor ID
1176
1177     loadPtr(Address(regT2, JSObject::offsetOfInheritorID()), regT2);
1178     addSlowCase(branchTestPtr(Zero, regT2));
1179
1180     // now regT2 contains the inheritorID, which is the structure that the newly
1181     // allocated object will have.
1182
1183     emitAllocateJSFinalObject(regT2, regT0, regT1);
1184
1185     emitPutVirtualRegister(currentInstruction[1].u.operand);
1186 }
1187
1188 void JIT::emitSlow_op_create_this(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1189 {
1190     linkSlowCaseIfNotJSCell(iter, currentInstruction[2].u.operand); // not a cell
1191     linkSlowCase(iter); // not an object
1192     linkSlowCase(iter); // doesn't have an inheritor ID
1193     linkSlowCase(iter); // allocation failed
1194     JITStubCall stubCall(this, cti_op_create_this);
1195     stubCall.addArgument(currentInstruction[2].u.operand, regT1);
1196     stubCall.call(currentInstruction[1].u.operand);
1197 }
1198
1199 void JIT::emit_op_profile_will_call(Instruction* currentInstruction)
1200 {
1201     peek(regT1, OBJECT_OFFSETOF(JITStackFrame, enabledProfilerReference) / sizeof(void*));
1202     Jump noProfiler = branchTestPtr(Zero, Address(regT1));
1203
1204     JITStubCall stubCall(this, cti_op_profile_will_call);
1205     stubCall.addArgument(currentInstruction[1].u.operand, regT1);
1206     stubCall.call();
1207     noProfiler.link(this);
1208
1209 }
1210
1211 void JIT::emit_op_profile_did_call(Instruction* currentInstruction)
1212 {
1213     peek(regT1, OBJECT_OFFSETOF(JITStackFrame, enabledProfilerReference) / sizeof(void*));
1214     Jump noProfiler = branchTestPtr(Zero, Address(regT1));
1215
1216     JITStubCall stubCall(this, cti_op_profile_did_call);
1217     stubCall.addArgument(currentInstruction[1].u.operand, regT1);
1218     stubCall.call();
1219     noProfiler.link(this);
1220 }
1221
1222
1223 // Slow cases
1224
1225 void JIT::emitSlow_op_convert_this(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1226 {
1227     void* globalThis = m_codeBlock->globalObject()->globalScopeChain()->globalThis.get();
1228
1229     linkSlowCase(iter);
1230     Jump isNotUndefined = branchPtr(NotEqual, regT0, TrustedImmPtr(JSValue::encode(jsUndefined())));
1231     move(TrustedImmPtr(globalThis), regT0);
1232     emitPutVirtualRegister(currentInstruction[1].u.operand, regT0);
1233     emitJumpSlowToHot(jump(), OPCODE_LENGTH(op_convert_this));
1234
1235     isNotUndefined.link(this);
1236     linkSlowCase(iter);
1237     JITStubCall stubCall(this, cti_op_convert_this);
1238     stubCall.addArgument(regT0);
1239     stubCall.call(currentInstruction[1].u.operand);
1240 }
1241
1242 void JIT::emitSlow_op_to_primitive(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1243 {
1244     linkSlowCase(iter);
1245
1246     JITStubCall stubCall(this, cti_op_to_primitive);
1247     stubCall.addArgument(regT0);
1248     stubCall.call(currentInstruction[1].u.operand);
1249 }
1250
1251 void JIT::emitSlow_op_not(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1252 {
1253     linkSlowCase(iter);
1254     xorPtr(TrustedImm32(static_cast<int32_t>(ValueFalse)), regT0);
1255     JITStubCall stubCall(this, cti_op_not);
1256     stubCall.addArgument(regT0);
1257     stubCall.call(currentInstruction[1].u.operand);
1258 }
1259
1260 void JIT::emitSlow_op_jfalse(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1261 {
1262     linkSlowCase(iter);
1263     JITStubCall stubCall(this, cti_op_jtrue);
1264     stubCall.addArgument(regT0);
1265     stubCall.call();
1266     emitJumpSlowToHot(branchTest32(Zero, regT0), currentInstruction[2].u.operand); // inverted!
1267 }
1268
1269 void JIT::emitSlow_op_bitnot(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1270 {
1271     linkSlowCase(iter);
1272     JITStubCall stubCall(this, cti_op_bitnot);
1273     stubCall.addArgument(regT0);
1274     stubCall.call(currentInstruction[1].u.operand);
1275 }
1276
1277 void JIT::emitSlow_op_jtrue(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1278 {
1279     linkSlowCase(iter);
1280     JITStubCall stubCall(this, cti_op_jtrue);
1281     stubCall.addArgument(regT0);
1282     stubCall.call();
1283     emitJumpSlowToHot(branchTest32(NonZero, regT0), currentInstruction[2].u.operand);
1284 }
1285
1286 void JIT::emitSlow_op_bitxor(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1287 {
1288     linkSlowCase(iter);
1289     JITStubCall stubCall(this, cti_op_bitxor);
1290     stubCall.addArgument(regT0);
1291     stubCall.addArgument(regT1);
1292     stubCall.call(currentInstruction[1].u.operand);
1293 }
1294
1295 void JIT::emitSlow_op_bitor(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1296 {
1297     linkSlowCase(iter);
1298     JITStubCall stubCall(this, cti_op_bitor);
1299     stubCall.addArgument(regT0);
1300     stubCall.addArgument(regT1);
1301     stubCall.call(currentInstruction[1].u.operand);
1302 }
1303
1304 void JIT::emitSlow_op_eq(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1305 {
1306     linkSlowCase(iter);
1307     JITStubCall stubCall(this, cti_op_eq);
1308     stubCall.addArgument(regT0);
1309     stubCall.addArgument(regT1);
1310     stubCall.call();
1311     emitTagAsBoolImmediate(regT0);
1312     emitPutVirtualRegister(currentInstruction[1].u.operand);
1313 }
1314
1315 void JIT::emitSlow_op_neq(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1316 {
1317     linkSlowCase(iter);
1318     JITStubCall stubCall(this, cti_op_eq);
1319     stubCall.addArgument(regT0);
1320     stubCall.addArgument(regT1);
1321     stubCall.call();
1322     xor32(TrustedImm32(0x1), regT0);
1323     emitTagAsBoolImmediate(regT0);
1324     emitPutVirtualRegister(currentInstruction[1].u.operand);
1325 }
1326
1327 void JIT::emitSlow_op_stricteq(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1328 {
1329     linkSlowCase(iter);
1330     linkSlowCase(iter);
1331     JITStubCall stubCall(this, cti_op_stricteq);
1332     stubCall.addArgument(regT0);
1333     stubCall.addArgument(regT1);
1334     stubCall.call(currentInstruction[1].u.operand);
1335 }
1336
1337 void JIT::emitSlow_op_nstricteq(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1338 {
1339     linkSlowCase(iter);
1340     linkSlowCase(iter);
1341     JITStubCall stubCall(this, cti_op_nstricteq);
1342     stubCall.addArgument(regT0);
1343     stubCall.addArgument(regT1);
1344     stubCall.call(currentInstruction[1].u.operand);
1345 }
1346
1347 void JIT::emitSlow_op_check_has_instance(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1348 {
1349     unsigned baseVal = currentInstruction[1].u.operand;
1350
1351     linkSlowCaseIfNotJSCell(iter, baseVal);
1352     linkSlowCase(iter);
1353     JITStubCall stubCall(this, cti_op_check_has_instance);
1354     stubCall.addArgument(baseVal, regT2);
1355     stubCall.call();
1356 }
1357
1358 void JIT::emitSlow_op_instanceof(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1359 {
1360     unsigned dst = currentInstruction[1].u.operand;
1361     unsigned value = currentInstruction[2].u.operand;
1362     unsigned baseVal = currentInstruction[3].u.operand;
1363     unsigned proto = currentInstruction[4].u.operand;
1364
1365     linkSlowCaseIfNotJSCell(iter, value);
1366     linkSlowCaseIfNotJSCell(iter, proto);
1367     linkSlowCase(iter);
1368     linkSlowCase(iter);
1369     JITStubCall stubCall(this, cti_op_instanceof);
1370     stubCall.addArgument(value, regT2);
1371     stubCall.addArgument(baseVal, regT2);
1372     stubCall.addArgument(proto, regT2);
1373     stubCall.call(dst);
1374 }
1375
1376 void JIT::emitSlow_op_call(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1377 {
1378     compileOpCallSlowCase(currentInstruction, iter, m_callLinkInfoIndex++, op_call);
1379 }
1380
1381 void JIT::emitSlow_op_call_eval(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1382 {
1383     compileOpCallSlowCase(currentInstruction, iter, m_callLinkInfoIndex++, op_call_eval);
1384 }
1385
1386 void JIT::emitSlow_op_call_varargs(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1387 {
1388     compileOpCallVarargsSlowCase(currentInstruction, iter);
1389 }
1390
1391 void JIT::emitSlow_op_construct(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1392 {
1393     compileOpCallSlowCase(currentInstruction, iter, m_callLinkInfoIndex++, op_construct);
1394 }
1395
1396 void JIT::emitSlow_op_to_jsnumber(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1397 {
1398     linkSlowCaseIfNotJSCell(iter, currentInstruction[2].u.operand);
1399     linkSlowCase(iter);
1400
1401     JITStubCall stubCall(this, cti_op_to_jsnumber);
1402     stubCall.addArgument(regT0);
1403     stubCall.call(currentInstruction[1].u.operand);
1404 }
1405
1406 void JIT::emit_op_get_arguments_length(Instruction* currentInstruction)
1407 {
1408     int dst = currentInstruction[1].u.operand;
1409     int argumentsRegister = currentInstruction[2].u.operand;
1410     addSlowCase(branchTestPtr(NonZero, addressFor(argumentsRegister)));
1411     emitGetFromCallFrameHeader32(RegisterFile::ArgumentCount, regT0);
1412     sub32(TrustedImm32(1), regT0);
1413     emitFastArithReTagImmediate(regT0, regT0);
1414     emitPutVirtualRegister(dst, regT0);
1415 }
1416
1417 void JIT::emitSlow_op_get_arguments_length(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1418 {
1419     linkSlowCase(iter);
1420     unsigned dst = currentInstruction[1].u.operand;
1421     unsigned base = currentInstruction[2].u.operand;
1422     Identifier* ident = &(m_codeBlock->identifier(currentInstruction[3].u.operand));
1423
1424     emitGetVirtualRegister(base, regT0);
1425     JITStubCall stubCall(this, cti_op_get_by_id_generic);
1426     stubCall.addArgument(regT0);
1427     stubCall.addArgument(TrustedImmPtr(ident));
1428     stubCall.call(dst);
1429 }
1430
1431 void JIT::emit_op_get_argument_by_val(Instruction* currentInstruction)
1432 {
1433     int dst = currentInstruction[1].u.operand;
1434     int argumentsRegister = currentInstruction[2].u.operand;
1435     int property = currentInstruction[3].u.operand;
1436     addSlowCase(branchTestPtr(NonZero, addressFor(argumentsRegister)));
1437     emitGetVirtualRegister(property, regT1);
1438     addSlowCase(emitJumpIfNotImmediateInteger(regT1));
1439     add32(TrustedImm32(1), regT1);
1440     // regT1 now contains the integer index of the argument we want, including this
1441     emitGetFromCallFrameHeader32(RegisterFile::ArgumentCount, regT2);
1442     addSlowCase(branch32(AboveOrEqual, regT1, regT2));
1443
1444     Jump skipOutofLineParams;
1445     int numArgs = m_codeBlock->m_numParameters;
1446     if (numArgs) {
1447         Jump notInInPlaceArgs = branch32(AboveOrEqual, regT1, Imm32(numArgs));
1448         addPtr(Imm32(static_cast<unsigned>(-(RegisterFile::CallFrameHeaderSize + numArgs) * sizeof(Register))), callFrameRegister, regT0);
1449         loadPtr(BaseIndex(regT0, regT1, TimesEight, 0), regT0);
1450         skipOutofLineParams = jump();
1451         notInInPlaceArgs.link(this);
1452     }
1453
1454     addPtr(Imm32(static_cast<unsigned>(-(RegisterFile::CallFrameHeaderSize + numArgs) * sizeof(Register))), callFrameRegister, regT0);
1455     mul32(TrustedImm32(sizeof(Register)), regT2, regT2);
1456     subPtr(regT2, regT0);
1457     loadPtr(BaseIndex(regT0, regT1, TimesEight, 0), regT0);
1458     if (numArgs)
1459         skipOutofLineParams.link(this);
1460     emitPutVirtualRegister(dst, regT0);
1461 }
1462
1463 void JIT::emitSlow_op_get_argument_by_val(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1464 {
1465     unsigned dst = currentInstruction[1].u.operand;
1466     unsigned arguments = currentInstruction[2].u.operand;
1467     unsigned property = currentInstruction[3].u.operand;
1468
1469     linkSlowCase(iter);
1470     Jump skipArgumentsCreation = jump();
1471
1472     linkSlowCase(iter);
1473     linkSlowCase(iter);
1474     if (m_codeBlock->m_numParameters == 1)
1475         JITStubCall(this, cti_op_create_arguments_no_params).call();
1476     else
1477         JITStubCall(this, cti_op_create_arguments).call();
1478     emitPutVirtualRegister(arguments);
1479     emitPutVirtualRegister(unmodifiedArgumentsRegister(arguments));
1480
1481     skipArgumentsCreation.link(this);
1482     JITStubCall stubCall(this, cti_op_get_by_val);
1483     stubCall.addArgument(arguments, regT2);
1484     stubCall.addArgument(property, regT2);
1485     stubCall.call(dst);
1486 }
1487
1488 #endif // USE(JSVALUE64)
1489
1490 void JIT::emit_op_resolve_global_dynamic(Instruction* currentInstruction)
1491 {
1492     int skip = currentInstruction[5].u.operand;
1493
1494     emitGetFromCallFrameHeaderPtr(RegisterFile::ScopeChain, regT0);
1495
1496     bool checkTopLevel = m_codeBlock->codeType() == FunctionCode && m_codeBlock->needsFullScopeChain();
1497     ASSERT(skip || !checkTopLevel);
1498     if (checkTopLevel && skip--) {
1499         Jump activationNotCreated;
1500         if (checkTopLevel)
1501             activationNotCreated = branchTestPtr(Zero, addressFor(m_codeBlock->activationRegister()));
1502         loadPtr(Address(regT0, OBJECT_OFFSETOF(ScopeChainNode, object)), regT1);
1503         addSlowCase(checkStructure(regT1, m_globalData->activationStructure.get()));
1504         loadPtr(Address(regT0, OBJECT_OFFSETOF(ScopeChainNode, next)), regT0);
1505         activationNotCreated.link(this);
1506     }
1507     while (skip--) {
1508         loadPtr(Address(regT0, OBJECT_OFFSETOF(ScopeChainNode, object)), regT1);
1509         addSlowCase(checkStructure(regT1, m_globalData->activationStructure.get()));
1510         loadPtr(Address(regT0, OBJECT_OFFSETOF(ScopeChainNode, next)), regT0);
1511     }
1512     emit_op_resolve_global(currentInstruction, true);
1513 }
1514
1515 void JIT::emitSlow_op_resolve_global_dynamic(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1516 {
1517     unsigned dst = currentInstruction[1].u.operand;
1518     Identifier* ident = &m_codeBlock->identifier(currentInstruction[2].u.operand);
1519     int skip = currentInstruction[5].u.operand;
1520     while (skip--)
1521         linkSlowCase(iter);
1522     JITStubCall resolveStubCall(this, cti_op_resolve);
1523     resolveStubCall.addArgument(TrustedImmPtr(ident));
1524     resolveStubCall.call(dst);
1525     emitJumpSlowToHot(jump(), OPCODE_LENGTH(op_resolve_global_dynamic));
1526
1527     unsigned currentIndex = m_globalResolveInfoIndex++;
1528
1529     linkSlowCase(iter); // We managed to skip all the nodes in the scope chain, but the cache missed.
1530     JITStubCall stubCall(this, cti_op_resolve_global);
1531     stubCall.addArgument(TrustedImmPtr(ident));
1532     stubCall.addArgument(Imm32(currentIndex));
1533     stubCall.addArgument(regT0);
1534     stubCall.call(dst);
1535 }
1536
1537 void JIT::emit_op_new_regexp(Instruction* currentInstruction)
1538 {
1539     JITStubCall stubCall(this, cti_op_new_regexp);
1540     stubCall.addArgument(TrustedImmPtr(m_codeBlock->regexp(currentInstruction[2].u.operand)));
1541     stubCall.call(currentInstruction[1].u.operand);
1542 }
1543
1544 void JIT::emit_op_load_varargs(Instruction* currentInstruction)
1545 {
1546     int argCountDst = currentInstruction[1].u.operand;
1547     int argsOffset = currentInstruction[2].u.operand;
1548     int registerOffset = currentInstruction[3].u.operand;
1549     ASSERT(argsOffset <= registerOffset);
1550
1551     int expectedParams = m_codeBlock->m_numParameters - 1;
1552     // Don't do inline copying if we aren't guaranteed to have a single stream
1553     // of arguments
1554     if (expectedParams) {
1555         JITStubCall stubCall(this, cti_op_load_varargs);
1556         stubCall.addArgument(Imm32(argsOffset));
1557         stubCall.call();
1558         // Stores a naked int32 in the register file.
1559         store32(returnValueRegister, Address(callFrameRegister, argCountDst * sizeof(Register)));
1560         return;
1561     }
1562
1563 #if USE(JSVALUE32_64)
1564     addSlowCase(branch32(NotEqual, tagFor(argsOffset), TrustedImm32(JSValue::EmptyValueTag)));
1565 #else
1566     addSlowCase(branchTestPtr(NonZero, addressFor(argsOffset)));
1567 #endif
1568     // Load arg count into regT0
1569     emitGetFromCallFrameHeader32(RegisterFile::ArgumentCount, regT0);
1570     store32(TrustedImm32(Int32Tag), intTagFor(argCountDst));
1571     store32(regT0, intPayloadFor(argCountDst));
1572     Jump endBranch = branch32(Equal, regT0, TrustedImm32(1));
1573
1574     mul32(TrustedImm32(sizeof(Register)), regT0, regT3);
1575     addPtr(TrustedImm32(static_cast<unsigned>(sizeof(Register) - RegisterFile::CallFrameHeaderSize * sizeof(Register))), callFrameRegister, regT1);
1576     subPtr(regT3, regT1); // regT1 is now the start of the out of line arguments
1577     addPtr(Imm32(argsOffset * sizeof(Register)), callFrameRegister, regT2); // regT2 is the target buffer
1578
1579     // Bounds check the registerfile
1580     addPtr(regT2, regT3);
1581     addPtr(Imm32((registerOffset - argsOffset) * sizeof(Register)), regT3);
1582     addSlowCase(branchPtr(Below, AbsoluteAddress(m_globalData->interpreter->registerFile().addressOfEnd()), regT3));
1583
1584     sub32(TrustedImm32(1), regT0);
1585     Label loopStart = label();
1586     loadPtr(BaseIndex(regT1, regT0, TimesEight, static_cast<unsigned>(0 - 2 * sizeof(Register))), regT3);
1587     storePtr(regT3, BaseIndex(regT2, regT0, TimesEight, static_cast<unsigned>(0 - sizeof(Register))));
1588 #if USE(JSVALUE32_64)
1589     loadPtr(BaseIndex(regT1, regT0, TimesEight, static_cast<unsigned>(sizeof(void*) - 2 * sizeof(Register))), regT3);
1590     storePtr(regT3, BaseIndex(regT2, regT0, TimesEight, static_cast<unsigned>(sizeof(void*) - sizeof(Register))));
1591 #endif
1592     branchSubPtr(NonZero, TrustedImm32(1), regT0).linkTo(loopStart, this);
1593     endBranch.link(this);
1594 }
1595
1596 void JIT::emitSlow_op_load_varargs(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1597 {
1598     int argCountDst = currentInstruction[1].u.operand;
1599     int argsOffset = currentInstruction[2].u.operand;
1600     int expectedParams = m_codeBlock->m_numParameters - 1;
1601     if (expectedParams)
1602         return;
1603
1604     linkSlowCase(iter);
1605     linkSlowCase(iter);
1606     JITStubCall stubCall(this, cti_op_load_varargs);
1607     stubCall.addArgument(Imm32(argsOffset));
1608     stubCall.call();
1609
1610     store32(TrustedImm32(Int32Tag), intTagFor(argCountDst));
1611     store32(returnValueRegister, intPayloadFor(argCountDst));
1612 }
1613
1614 void JIT::emit_op_new_func(Instruction* currentInstruction)
1615 {
1616     Jump lazyJump;
1617     int dst = currentInstruction[1].u.operand;
1618     if (currentInstruction[3].u.operand) {
1619 #if USE(JSVALUE32_64)
1620         lazyJump = branch32(NotEqual, tagFor(dst), TrustedImm32(JSValue::EmptyValueTag));
1621 #else
1622         lazyJump = branchTestPtr(NonZero, addressFor(dst));
1623 #endif
1624     }
1625
1626     FunctionExecutable* executable = m_codeBlock->functionDecl(currentInstruction[2].u.operand);
1627     emitGetFromCallFrameHeaderPtr(RegisterFile::ScopeChain, regT2);
1628     emitAllocateJSFunction(executable, regT2, regT0, regT1);
1629
1630     emitStoreCell(dst, regT0);
1631
1632     if (currentInstruction[3].u.operand) {
1633 #if USE(JSVALUE32_64)
1634         unmap();
1635 #else
1636         killLastResultRegister();
1637 #endif
1638         lazyJump.link(this);
1639     }
1640 }
1641
1642 void JIT::emitSlow_op_new_func(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1643 {
1644     linkSlowCase(iter);
1645     JITStubCall stubCall(this, cti_op_new_func);
1646     stubCall.addArgument(TrustedImmPtr(m_codeBlock->functionDecl(currentInstruction[2].u.operand)));
1647     stubCall.call(currentInstruction[1].u.operand);
1648 }
1649
1650 void JIT::emit_op_new_func_exp(Instruction* currentInstruction)
1651 {
1652     FunctionExecutable* executable = m_codeBlock->functionExpr(currentInstruction[2].u.operand);
1653
1654     // We only inline the allocation of a anonymous function expressions
1655     // If we want to be able to allocate a named function expression, we would
1656     // need to be able to do inline allocation of a JSStaticScopeObject.
1657     if (executable->name().isNull()) {
1658         emitGetFromCallFrameHeaderPtr(RegisterFile::ScopeChain, regT2);
1659         emitAllocateJSFunction(executable, regT2, regT0, regT1);
1660         emitStoreCell(currentInstruction[1].u.operand, regT0);
1661         return;
1662     }
1663
1664     JITStubCall stubCall(this, cti_op_new_func_exp);
1665     stubCall.addArgument(TrustedImmPtr(m_codeBlock->functionExpr(currentInstruction[2].u.operand)));
1666     stubCall.call(currentInstruction[1].u.operand);
1667 }
1668
1669 void JIT::emitSlow_op_new_func_exp(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1670 {
1671     FunctionExecutable* executable = m_codeBlock->functionExpr(currentInstruction[2].u.operand);
1672     if (!executable->name().isNull())
1673         return;
1674     linkSlowCase(iter);
1675     JITStubCall stubCall(this, cti_op_new_func_exp);
1676     stubCall.addArgument(TrustedImmPtr(executable));
1677     stubCall.call(currentInstruction[1].u.operand);
1678 }
1679
1680 void JIT::emit_op_new_array(Instruction* currentInstruction)
1681 {
1682     JITStubCall stubCall(this, cti_op_new_array);
1683     stubCall.addArgument(Imm32(currentInstruction[2].u.operand));
1684     stubCall.addArgument(Imm32(currentInstruction[3].u.operand));
1685     stubCall.call(currentInstruction[1].u.operand);
1686 }
1687
1688 void JIT::emit_op_new_array_buffer(Instruction* currentInstruction)
1689 {
1690     JITStubCall stubCall(this, cti_op_new_array_buffer);
1691     stubCall.addArgument(Imm32(currentInstruction[2].u.operand));
1692     stubCall.addArgument(Imm32(currentInstruction[3].u.operand));
1693     stubCall.call(currentInstruction[1].u.operand);
1694 }
1695
1696 } // namespace JSC
1697
1698 #endif // ENABLE(JIT)