Source/JavaScriptCore/jit/JITOpcodes.cpp

   1 /*
   2  * Copyright (C) 2009, 2012 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 "CopiedSpaceInlines.h"
  33 #include "Heap.h"
  34 #include "JITInlines.h"
  35 #include "JITStubCall.h"
  36 #include "JSArray.h"
  37 #include "JSCell.h"
  38 #include "JSFunction.h"
  39 #include "JSPropertyNameIterator.h"
  40 #include "LinkBuffer.h"
  41 #include "SlowPathCall.h"
  42
  43 namespace JSC {
  44
  45 #if USE(JSVALUE64)
  46
  47 JIT::CodeRef JIT::privateCompileCTINativeCall(VM* vm, NativeFunction)
  48 {
  49     return vm->getCTIStub(nativeCallGenerator);
  50 }
  51
  52 void JIT::emit_op_mov(Instruction* currentInstruction)
  53 {
  54     int dst = currentInstruction[1].u.operand;
  55     int src = currentInstruction[2].u.operand;
  56
  57     if (canBeOptimizedOrInlined()) {
  58         // Use simpler approach, since the DFG thinks that the last result register
  59         // is always set to the destination on every operation.
  60         emitGetVirtualRegister(src, regT0);
  61         emitPutVirtualRegister(dst);
  62     } else {
  63         if (m_codeBlock->isConstantRegisterIndex(src)) {
  64             if (!getConstantOperand(src).isNumber())
  65                 store64(TrustedImm64(JSValue::encode(getConstantOperand(src))), Address(callFrameRegister, dst * sizeof(Register)));
  66             else
  67                 store64(Imm64(JSValue::encode(getConstantOperand(src))), Address(callFrameRegister, dst * sizeof(Register)));
  68             if (dst == m_lastResultBytecodeRegister)
  69                 killLastResultRegister();
  70         } else if ((src == m_lastResultBytecodeRegister) || (dst == m_lastResultBytecodeRegister)) {
  71             // If either the src or dst is the cached register go though
  72             // get/put registers to make sure we track this correctly.
  73             emitGetVirtualRegister(src, regT0);
  74             emitPutVirtualRegister(dst);
  75         } else {
  76             // Perform the copy via regT1; do not disturb any mapping in regT0.
  77             load64(Address(callFrameRegister, src * sizeof(Register)), regT1);
  78             store64(regT1, Address(callFrameRegister, dst * sizeof(Register)));
  79         }
  80     }
  81 }
  82
  83 void JIT::emit_op_end(Instruction* currentInstruction)
  84 {
  85     RELEASE_ASSERT(returnValueRegister != callFrameRegister);
  86     emitGetVirtualRegister(currentInstruction[1].u.operand, returnValueRegister);
  87     restoreReturnAddressBeforeReturn(Address(callFrameRegister, JSStack::ReturnPC * static_cast<int>(sizeof(Register))));
  88     ret();
  89 }
  90
  91 void JIT::emit_op_jmp(Instruction* currentInstruction)
  92 {
  93     unsigned target = currentInstruction[1].u.operand;
  94     addJump(jump(), target);
  95 }
  96
  97 void JIT::emit_op_new_object(Instruction* currentInstruction)
  98 {
  99     Structure* structure = currentInstruction[3].u.objectAllocationProfile->structure();
 100     size_t allocationSize = JSFinalObject::allocationSize(structure->inlineCapacity());
 101     MarkedAllocator* allocator = &m_vm->heap.allocatorForObjectWithoutDestructor(allocationSize);
 102
 103     RegisterID resultReg = regT0;
 104     RegisterID allocatorReg = regT1;
 105     RegisterID scratchReg = regT2;
 106
 107     move(TrustedImmPtr(allocator), allocatorReg);
 108     emitAllocateJSObject(allocatorReg, TrustedImmPtr(structure), resultReg, scratchReg);
 109     emitPutVirtualRegister(currentInstruction[1].u.operand);
 110 }
 111
 112 void JIT::emitSlow_op_new_object(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
 113 {
 114     linkSlowCase(iter);
 115     JITStubCall stubCall(this, cti_op_new_object);
 116     stubCall.addArgument(TrustedImmPtr(currentInstruction[3].u.objectAllocationProfile->structure()));
 117     stubCall.call(currentInstruction[1].u.operand);
 118 }
 119
 120 void JIT::emit_op_check_has_instance(Instruction* currentInstruction)
 121 {
 122     int baseVal = currentInstruction[3].u.operand;
 123
 124     emitGetVirtualRegister(baseVal, regT0);
 125
 126     // Check that baseVal is a cell.
 127     emitJumpSlowCaseIfNotJSCell(regT0, baseVal);
 128
 129     // Check that baseVal 'ImplementsHasInstance'.
 130     loadPtr(Address(regT0, JSCell::structureOffset()), regT0);
 131     addSlowCase(branchTest8(Zero, Address(regT0, Structure::typeInfoFlagsOffset()), TrustedImm32(ImplementsDefaultHasInstance)));
 132 }
 133
 134 void JIT::emit_op_instanceof(Instruction* currentInstruction)
 135 {
 136     int dst = currentInstruction[1].u.operand;
 137     int value = currentInstruction[2].u.operand;
 138     int proto = currentInstruction[3].u.operand;
 139
 140     // Load the operands (baseVal, proto, and value respectively) into registers.
 141     // We use regT0 for baseVal since we will be done with this first, and we can then use it for the result.
 142     emitGetVirtualRegister(value, regT2);
 143     emitGetVirtualRegister(proto, regT1);
 144
 145     // Check that proto are cells.  baseVal must be a cell - this is checked by op_check_has_instance.
 146     emitJumpSlowCaseIfNotJSCell(regT2, value);
 147     emitJumpSlowCaseIfNotJSCell(regT1, proto);
 148
 149     // Check that prototype is an object
 150     loadPtr(Address(regT1, JSCell::structureOffset()), regT3);
 151     addSlowCase(emitJumpIfNotObject(regT3));
 152
 153     // Optimistically load the result true, and start looping.
 154     // Initially, regT1 still contains proto and regT2 still contains value.
 155     // As we loop regT2 will be updated with its prototype, recursively walking the prototype chain.
 156     move(TrustedImm64(JSValue::encode(jsBoolean(true))), regT0);
 157     Label loop(this);
 158
 159     // Load the prototype of the object in regT2.  If this is equal to regT1 - WIN!
 160     // Otherwise, check if we've hit null - if we have then drop out of the loop, if not go again.
 161     loadPtr(Address(regT2, JSCell::structureOffset()), regT2);
 162     load64(Address(regT2, Structure::prototypeOffset()), regT2);
 163     Jump isInstance = branchPtr(Equal, regT2, regT1);
 164     emitJumpIfJSCell(regT2).linkTo(loop, this);
 165
 166     // We get here either by dropping out of the loop, or if value was not an Object.  Result is false.
 167     move(TrustedImm64(JSValue::encode(jsBoolean(false))), regT0);
 168
 169     // isInstance jumps right down to here, to skip setting the result to false (it has already set true).
 170     isInstance.link(this);
 171     emitPutVirtualRegister(dst);
 172 }
 173
 174 void JIT::emit_op_is_undefined(Instruction* currentInstruction)
 175 {
 176     int dst = currentInstruction[1].u.operand;
 177     int value = currentInstruction[2].u.operand;
 178
 179     emitGetVirtualRegister(value, regT0);
 180     Jump isCell = emitJumpIfJSCell(regT0);
 181
 182     compare64(Equal, regT0, TrustedImm32(ValueUndefined), regT0);
 183     Jump done = jump();
 184
 185     isCell.link(this);
 186     loadPtr(Address(regT0, JSCell::structureOffset()), regT1);
 187     Jump isMasqueradesAsUndefined = branchTest8(NonZero, Address(regT1, Structure::typeInfoFlagsOffset()), TrustedImm32(MasqueradesAsUndefined));
 188     move(TrustedImm32(0), regT0);
 189     Jump notMasqueradesAsUndefined = jump();
 190
 191     isMasqueradesAsUndefined.link(this);
 192     move(TrustedImmPtr(m_codeBlock->globalObject()), regT0);
 193     loadPtr(Address(regT1, Structure::globalObjectOffset()), regT1);
 194     comparePtr(Equal, regT0, regT1, regT0);
 195
 196     notMasqueradesAsUndefined.link(this);
 197     done.link(this);
 198     emitTagAsBoolImmediate(regT0);
 199     emitPutVirtualRegister(dst);
 200 }
 201
 202 void JIT::emit_op_is_boolean(Instruction* currentInstruction)
 203 {
 204     int dst = currentInstruction[1].u.operand;
 205     int value = currentInstruction[2].u.operand;
 206
 207     emitGetVirtualRegister(value, regT0);
 208     xor64(TrustedImm32(static_cast<int32_t>(ValueFalse)), regT0);
 209     test64(Zero, regT0, TrustedImm32(static_cast<int32_t>(~1)), regT0);
 210     emitTagAsBoolImmediate(regT0);
 211     emitPutVirtualRegister(dst);
 212 }
 213
 214 void JIT::emit_op_is_number(Instruction* currentInstruction)
 215 {
 216     int dst = currentInstruction[1].u.operand;
 217     int value = currentInstruction[2].u.operand;
 218
 219     emitGetVirtualRegister(value, regT0);
 220     test64(NonZero, regT0, tagTypeNumberRegister, regT0);
 221     emitTagAsBoolImmediate(regT0);
 222     emitPutVirtualRegister(dst);
 223 }
 224
 225 void JIT::emit_op_is_string(Instruction* currentInstruction)
 226 {
 227     int dst = currentInstruction[1].u.operand;
 228     int value = currentInstruction[2].u.operand;
 229
 230     emitGetVirtualRegister(value, regT0);
 231     Jump isNotCell = emitJumpIfNotJSCell(regT0);
 232
 233     loadPtr(Address(regT0, JSCell::structureOffset()), regT1);
 234     compare8(Equal, Address(regT1, Structure::typeInfoTypeOffset()), TrustedImm32(StringType), regT0);
 235     emitTagAsBoolImmediate(regT0);
 236     Jump done = jump();
 237
 238     isNotCell.link(this);
 239     move(TrustedImm32(ValueFalse), regT0);
 240
 241     done.link(this);
 242     emitPutVirtualRegister(dst);
 243 }
 244
 245 void JIT::emit_op_tear_off_activation(Instruction* currentInstruction)
 246 {
 247     int activation = currentInstruction[1].u.operand;
 248     Jump activationNotCreated = branchTest64(Zero, addressFor(activation));
 249     JITStubCall stubCall(this, cti_op_tear_off_activation);
 250     stubCall.addArgument(activation, regT2);
 251     stubCall.call();
 252     activationNotCreated.link(this);
 253 }
 254
 255 void JIT::emit_op_tear_off_arguments(Instruction* currentInstruction)
 256 {
 257     int arguments = currentInstruction[1].u.operand;
 258     int activation = currentInstruction[2].u.operand;
 259
 260     Jump argsNotCreated = branchTest64(Zero, Address(callFrameRegister, sizeof(Register) * (unmodifiedArgumentsRegister(arguments))));
 261     JITStubCall stubCall(this, cti_op_tear_off_arguments);
 262     stubCall.addArgument(unmodifiedArgumentsRegister(arguments), regT2);
 263     stubCall.addArgument(activation, regT2);
 264     stubCall.call();
 265     argsNotCreated.link(this);
 266 }
 267
 268 void JIT::emit_op_ret(Instruction* currentInstruction)
 269 {
 270     ASSERT(callFrameRegister != regT1);
 271     ASSERT(regT1 != returnValueRegister);
 272     ASSERT(returnValueRegister != callFrameRegister);
 273
 274     // Return the result in %eax.
 275     emitGetVirtualRegister(currentInstruction[1].u.operand, returnValueRegister);
 276
 277     // Grab the return address.
 278     emitGetFromCallFrameHeaderPtr(JSStack::ReturnPC, regT1);
 279
 280     // Restore our caller's "r".
 281     emitGetFromCallFrameHeaderPtr(JSStack::CallerFrame, callFrameRegister);
 282
 283     // Return.
 284     restoreReturnAddressBeforeReturn(regT1);
 285     ret();
 286 }
 287
 288 void JIT::emit_op_ret_object_or_this(Instruction* currentInstruction)
 289 {
 290     ASSERT(callFrameRegister != regT1);
 291     ASSERT(regT1 != returnValueRegister);
 292     ASSERT(returnValueRegister != callFrameRegister);
 293
 294     // Return the result in %eax.
 295     emitGetVirtualRegister(currentInstruction[1].u.operand, returnValueRegister);
 296     Jump notJSCell = emitJumpIfNotJSCell(returnValueRegister);
 297     loadPtr(Address(returnValueRegister, JSCell::structureOffset()), regT2);
 298     Jump notObject = emitJumpIfNotObject(regT2);
 299
 300     // Grab the return address.
 301     emitGetFromCallFrameHeaderPtr(JSStack::ReturnPC, regT1);
 302
 303     // Restore our caller's "r".
 304     emitGetFromCallFrameHeaderPtr(JSStack::CallerFrame, callFrameRegister);
 305
 306     // Return.
 307     restoreReturnAddressBeforeReturn(regT1);
 308     ret();
 309
 310     // Return 'this' in %eax.
 311     notJSCell.link(this);
 312     notObject.link(this);
 313     emitGetVirtualRegister(currentInstruction[2].u.operand, returnValueRegister);
 314
 315     // Grab the return address.
 316     emitGetFromCallFrameHeaderPtr(JSStack::ReturnPC, regT1);
 317
 318     // Restore our caller's "r".
 319     emitGetFromCallFrameHeaderPtr(JSStack::CallerFrame, callFrameRegister);
 320
 321     // Return.
 322     restoreReturnAddressBeforeReturn(regT1);
 323     ret();
 324 }
 325
 326 void JIT::emit_op_to_primitive(Instruction* currentInstruction)
 327 {
 328     int dst = currentInstruction[1].u.operand;
 329     int src = currentInstruction[2].u.operand;
 330
 331     emitGetVirtualRegister(src, regT0);
 332
 333     Jump isImm = emitJumpIfNotJSCell(regT0);
 334     addSlowCase(branchPtr(NotEqual, Address(regT0, JSCell::structureOffset()), TrustedImmPtr(m_vm->stringStructure.get())));
 335     isImm.link(this);
 336
 337     if (dst != src)
 338         emitPutVirtualRegister(dst);
 339
 340 }
 341
 342 void JIT::emit_op_strcat(Instruction* currentInstruction)
 343 {
 344     JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_strcat);
 345     slowPathCall.call();
 346     emitGetVirtualRegister(currentInstruction[1].u.operand, regT0);
 347 }
 348
 349 void JIT::emit_op_not(Instruction* currentInstruction)
 350 {
 351     emitGetVirtualRegister(currentInstruction[2].u.operand, regT0);
 352
 353     // Invert against JSValue(false); if the value was tagged as a boolean, then all bits will be
 354     // clear other than the low bit (which will be 0 or 1 for false or true inputs respectively).
 355     // Then invert against JSValue(true), which will add the tag back in, and flip the low bit.
 356     xor64(TrustedImm32(static_cast<int32_t>(ValueFalse)), regT0);
 357     addSlowCase(branchTestPtr(NonZero, regT0, TrustedImm32(static_cast<int32_t>(~1))));
 358     xor64(TrustedImm32(static_cast<int32_t>(ValueTrue)), regT0);
 359
 360     emitPutVirtualRegister(currentInstruction[1].u.operand);
 361 }
 362
 363 void JIT::emit_op_jfalse(Instruction* currentInstruction)
 364 {
 365     unsigned target = currentInstruction[2].u.operand;
 366     emitGetVirtualRegister(currentInstruction[1].u.operand, regT0);
 367
 368     addJump(branch64(Equal, regT0, TrustedImm64(JSValue::encode(jsNumber(0)))), target);
 369     Jump isNonZero = emitJumpIfImmediateInteger(regT0);
 370
 371     addJump(branch64(Equal, regT0, TrustedImm64(JSValue::encode(jsBoolean(false)))), target);
 372     addSlowCase(branch64(NotEqual, regT0, TrustedImm64(JSValue::encode(jsBoolean(true)))));
 373
 374     isNonZero.link(this);
 375 }
 376
 377 void JIT::emit_op_jeq_null(Instruction* currentInstruction)
 378 {
 379     int src = currentInstruction[1].u.operand;
 380     unsigned target = currentInstruction[2].u.operand;
 381
 382     emitGetVirtualRegister(src, regT0);
 383     Jump isImmediate = emitJumpIfNotJSCell(regT0);
 384
 385     // First, handle JSCell cases - check MasqueradesAsUndefined bit on the structure.
 386     loadPtr(Address(regT0, JSCell::structureOffset()), regT2);
 387     Jump isNotMasqueradesAsUndefined = branchTest8(Zero, Address(regT2, Structure::typeInfoFlagsOffset()), TrustedImm32(MasqueradesAsUndefined));
 388     move(TrustedImmPtr(m_codeBlock->globalObject()), regT0);
 389     addJump(branchPtr(Equal, Address(regT2, Structure::globalObjectOffset()), regT0), target);
 390     Jump masqueradesGlobalObjectIsForeign = jump();
 391
 392     // Now handle the immediate cases - undefined & null
 393     isImmediate.link(this);
 394     and64(TrustedImm32(~TagBitUndefined), regT0);
 395     addJump(branch64(Equal, regT0, TrustedImm64(JSValue::encode(jsNull()))), target);
 396
 397     isNotMasqueradesAsUndefined.link(this);
 398     masqueradesGlobalObjectIsForeign.link(this);
 399 };
 400 void JIT::emit_op_jneq_null(Instruction* currentInstruction)
 401 {
 402     int src = currentInstruction[1].u.operand;
 403     unsigned target = currentInstruction[2].u.operand;
 404
 405     emitGetVirtualRegister(src, regT0);
 406     Jump isImmediate = emitJumpIfNotJSCell(regT0);
 407
 408     // First, handle JSCell cases - check MasqueradesAsUndefined bit on the structure.
 409     loadPtr(Address(regT0, JSCell::structureOffset()), regT2);
 410     addJump(branchTest8(Zero, Address(regT2, Structure::typeInfoFlagsOffset()), TrustedImm32(MasqueradesAsUndefined)), target);
 411     move(TrustedImmPtr(m_codeBlock->globalObject()), regT0);
 412     addJump(branchPtr(NotEqual, Address(regT2, Structure::globalObjectOffset()), regT0), target);
 413     Jump wasNotImmediate = jump();
 414
 415     // Now handle the immediate cases - undefined & null
 416     isImmediate.link(this);
 417     and64(TrustedImm32(~TagBitUndefined), regT0);
 418     addJump(branch64(NotEqual, regT0, TrustedImm64(JSValue::encode(jsNull()))), target);
 419
 420     wasNotImmediate.link(this);
 421 }
 422
 423 void JIT::emit_op_jneq_ptr(Instruction* currentInstruction)
 424 {
 425     int src = currentInstruction[1].u.operand;
 426     Special::Pointer ptr = currentInstruction[2].u.specialPointer;
 427     unsigned target = currentInstruction[3].u.operand;
 428
 429     emitGetVirtualRegister(src, regT0);
 430     addJump(branchPtr(NotEqual, regT0, TrustedImmPtr(actualPointerFor(m_codeBlock, ptr))), target);
 431 }
 432
 433 void JIT::emit_op_eq(Instruction* currentInstruction)
 434 {
 435     emitGetVirtualRegisters(currentInstruction[2].u.operand, regT0, currentInstruction[3].u.operand, regT1);
 436     emitJumpSlowCaseIfNotImmediateIntegers(regT0, regT1, regT2);
 437     compare32(Equal, regT1, regT0, regT0);
 438     emitTagAsBoolImmediate(regT0);
 439     emitPutVirtualRegister(currentInstruction[1].u.operand);
 440 }
 441
 442 void JIT::emit_op_jtrue(Instruction* currentInstruction)
 443 {
 444     unsigned target = currentInstruction[2].u.operand;
 445     emitGetVirtualRegister(currentInstruction[1].u.operand, regT0);
 446
 447     Jump isZero = branch64(Equal, regT0, TrustedImm64(JSValue::encode(jsNumber(0))));
 448     addJump(emitJumpIfImmediateInteger(regT0), target);
 449
 450     addJump(branch64(Equal, regT0, TrustedImm64(JSValue::encode(jsBoolean(true)))), target);
 451     addSlowCase(branch64(NotEqual, regT0, TrustedImm64(JSValue::encode(jsBoolean(false)))));
 452
 453     isZero.link(this);
 454 }
 455
 456 void JIT::emit_op_neq(Instruction* currentInstruction)
 457 {
 458     emitGetVirtualRegisters(currentInstruction[2].u.operand, regT0, currentInstruction[3].u.operand, regT1);
 459     emitJumpSlowCaseIfNotImmediateIntegers(regT0, regT1, regT2);
 460     compare32(NotEqual, regT1, regT0, regT0);
 461     emitTagAsBoolImmediate(regT0);
 462
 463     emitPutVirtualRegister(currentInstruction[1].u.operand);
 464
 465 }
 466
 467 void JIT::emit_op_bitxor(Instruction* currentInstruction)
 468 {
 469     emitGetVirtualRegisters(currentInstruction[2].u.operand, regT0, currentInstruction[3].u.operand, regT1);
 470     emitJumpSlowCaseIfNotImmediateIntegers(regT0, regT1, regT2);
 471     xor64(regT1, regT0);
 472     emitFastArithReTagImmediate(regT0, regT0);
 473     emitPutVirtualRegister(currentInstruction[1].u.operand);
 474 }
 475
 476 void JIT::emit_op_bitor(Instruction* currentInstruction)
 477 {
 478     emitGetVirtualRegisters(currentInstruction[2].u.operand, regT0, currentInstruction[3].u.operand, regT1);
 479     emitJumpSlowCaseIfNotImmediateIntegers(regT0, regT1, regT2);
 480     or64(regT1, regT0);
 481     emitPutVirtualRegister(currentInstruction[1].u.operand);
 482 }
 483
 484 void JIT::emit_op_throw(Instruction* currentInstruction)
 485 {
 486     JITStubCall stubCall(this, cti_op_throw);
 487     stubCall.addArgument(currentInstruction[1].u.operand, regT2);
 488     stubCall.call();
 489     ASSERT(regT0 == returnValueRegister);
 490 #ifndef NDEBUG
 491     // cti_op_throw always changes it's return address,
 492     // this point in the code should never be reached.
 493     breakpoint();
 494 #endif
 495 }
 496
 497 void JIT::emit_op_get_pnames(Instruction* currentInstruction)
 498 {
 499     int dst = currentInstruction[1].u.operand;
 500     int base = currentInstruction[2].u.operand;
 501     int i = currentInstruction[3].u.operand;
 502     int size = currentInstruction[4].u.operand;
 503     int breakTarget = currentInstruction[5].u.operand;
 504
 505     JumpList isNotObject;
 506
 507     emitGetVirtualRegister(base, regT0);
 508     if (!m_codeBlock->isKnownNotImmediate(base))
 509         isNotObject.append(emitJumpIfNotJSCell(regT0));
 510     if (base != m_codeBlock->thisRegister() || m_codeBlock->isStrictMode()) {
 511         loadPtr(Address(regT0, JSCell::structureOffset()), regT2);
 512         isNotObject.append(emitJumpIfNotObject(regT2));
 513     }
 514
 515     // We could inline the case where you have a valid cache, but
 516     // this call doesn't seem to be hot.
 517     Label isObject(this);
 518     JITStubCall getPnamesStubCall(this, cti_op_get_pnames);
 519     getPnamesStubCall.addArgument(regT0);
 520     getPnamesStubCall.call(dst);
 521     load32(Address(regT0, OBJECT_OFFSETOF(JSPropertyNameIterator, m_jsStringsSize)), regT3);
 522     store64(tagTypeNumberRegister, addressFor(i));
 523     store32(TrustedImm32(Int32Tag), intTagFor(size));
 524     store32(regT3, intPayloadFor(size));
 525     Jump end = jump();
 526
 527     isNotObject.link(this);
 528     move(regT0, regT1);
 529     and32(TrustedImm32(~TagBitUndefined), regT1);
 530     addJump(branch32(Equal, regT1, TrustedImm32(ValueNull)), breakTarget);
 531
 532     JITStubCall toObjectStubCall(this, cti_to_object);
 533     toObjectStubCall.addArgument(regT0);
 534     toObjectStubCall.call(base);
 535     jump().linkTo(isObject, this);
 536
 537     end.link(this);
 538 }
 539
 540 void JIT::emit_op_next_pname(Instruction* currentInstruction)
 541 {
 542     int dst = currentInstruction[1].u.operand;
 543     int base = currentInstruction[2].u.operand;
 544     int i = currentInstruction[3].u.operand;
 545     int size = currentInstruction[4].u.operand;
 546     int it = currentInstruction[5].u.operand;
 547     int target = currentInstruction[6].u.operand;
 548
 549     JumpList callHasProperty;
 550
 551     Label begin(this);
 552     load32(intPayloadFor(i), regT0);
 553     Jump end = branch32(Equal, regT0, intPayloadFor(size));
 554
 555     // Grab key @ i
 556     loadPtr(addressFor(it), regT1);
 557     loadPtr(Address(regT1, OBJECT_OFFSETOF(JSPropertyNameIterator, m_jsStrings)), regT2);
 558
 559     load64(BaseIndex(regT2, regT0, TimesEight), regT2);
 560
 561     emitPutVirtualRegister(dst, regT2);
 562
 563     // Increment i
 564     add32(TrustedImm32(1), regT0);
 565     store32(regT0, intPayloadFor(i));
 566
 567     // Verify that i is valid:
 568     emitGetVirtualRegister(base, regT0);
 569
 570     // Test base's structure
 571     loadPtr(Address(regT0, JSCell::structureOffset()), regT2);
 572     callHasProperty.append(branchPtr(NotEqual, regT2, Address(Address(regT1, OBJECT_OFFSETOF(JSPropertyNameIterator, m_cachedStructure)))));
 573
 574     // Test base's prototype chain
 575     loadPtr(Address(Address(regT1, OBJECT_OFFSETOF(JSPropertyNameIterator, m_cachedPrototypeChain))), regT3);
 576     loadPtr(Address(regT3, OBJECT_OFFSETOF(StructureChain, m_vector)), regT3);
 577     addJump(branchTestPtr(Zero, Address(regT3)), target);
 578
 579     Label checkPrototype(this);
 580     load64(Address(regT2, Structure::prototypeOffset()), regT2);
 581     callHasProperty.append(emitJumpIfNotJSCell(regT2));
 582     loadPtr(Address(regT2, JSCell::structureOffset()), regT2);
 583     callHasProperty.append(branchPtr(NotEqual, regT2, Address(regT3)));
 584     addPtr(TrustedImm32(sizeof(Structure*)), regT3);
 585     branchTestPtr(NonZero, Address(regT3)).linkTo(checkPrototype, this);
 586
 587     // Continue loop.
 588     addJump(jump(), target);
 589
 590     // Slow case: Ask the object if i is valid.
 591     callHasProperty.link(this);
 592     emitGetVirtualRegister(dst, regT1);
 593     JITStubCall stubCall(this, cti_has_property);
 594     stubCall.addArgument(regT0);
 595     stubCall.addArgument(regT1);
 596     stubCall.call();
 597
 598     // Test for valid key.
 599     addJump(branchTest32(NonZero, regT0), target);
 600     jump().linkTo(begin, this);
 601
 602     // End of loop.
 603     end.link(this);
 604 }
 605
 606 void JIT::emit_op_push_with_scope(Instruction* currentInstruction)
 607 {
 608     JITStubCall stubCall(this, cti_op_push_with_scope);
 609     stubCall.addArgument(currentInstruction[1].u.operand, regT2);
 610     stubCall.call();
 611 }
 612
 613 void JIT::emit_op_pop_scope(Instruction*)
 614 {
 615     JITStubCall(this, cti_op_pop_scope).call();
 616 }
 617
 618 void JIT::compileOpStrictEq(Instruction* currentInstruction, CompileOpStrictEqType type)
 619 {
 620     int dst = currentInstruction[1].u.operand;
 621     int src1 = currentInstruction[2].u.operand;
 622     int src2 = currentInstruction[3].u.operand;
 623
 624     emitGetVirtualRegisters(src1, regT0, src2, regT1);
 625
 626     // Jump slow if both are cells (to cover strings).
 627     move(regT0, regT2);
 628     or64(regT1, regT2);
 629     addSlowCase(emitJumpIfJSCell(regT2));
 630
 631     // Jump slow if either is a double. First test if it's an integer, which is fine, and then test
 632     // if it's a double.
 633     Jump leftOK = emitJumpIfImmediateInteger(regT0);
 634     addSlowCase(emitJumpIfImmediateNumber(regT0));
 635     leftOK.link(this);
 636     Jump rightOK = emitJumpIfImmediateInteger(regT1);
 637     addSlowCase(emitJumpIfImmediateNumber(regT1));
 638     rightOK.link(this);
 639
 640     if (type == OpStrictEq)
 641         compare64(Equal, regT1, regT0, regT0);
 642     else
 643         compare64(NotEqual, regT1, regT0, regT0);
 644     emitTagAsBoolImmediate(regT0);
 645
 646     emitPutVirtualRegister(dst);
 647 }
 648
 649 void JIT::emit_op_stricteq(Instruction* currentInstruction)
 650 {
 651     compileOpStrictEq(currentInstruction, OpStrictEq);
 652 }
 653
 654 void JIT::emit_op_nstricteq(Instruction* currentInstruction)
 655 {
 656     compileOpStrictEq(currentInstruction, OpNStrictEq);
 657 }
 658
 659 void JIT::emit_op_to_number(Instruction* currentInstruction)
 660 {
 661     int srcVReg = currentInstruction[2].u.operand;
 662     emitGetVirtualRegister(srcVReg, regT0);
 663
 664     addSlowCase(emitJumpIfNotImmediateNumber(regT0));
 665
 666     emitPutVirtualRegister(currentInstruction[1].u.operand);
 667 }
 668
 669 void JIT::emit_op_push_name_scope(Instruction* currentInstruction)
 670 {
 671     JITStubCall stubCall(this, cti_op_push_name_scope);
 672     stubCall.addArgument(TrustedImmPtr(&m_codeBlock->identifier(currentInstruction[1].u.operand)));
 673     stubCall.addArgument(currentInstruction[2].u.operand, regT2);
 674     stubCall.addArgument(TrustedImm32(currentInstruction[3].u.operand));
 675     stubCall.call();
 676 }
 677
 678 void JIT::emit_op_catch(Instruction* currentInstruction)
 679 {
 680     killLastResultRegister(); // FIXME: Implicitly treat op_catch as a labeled statement, and remove this line of code.
 681     move(regT0, callFrameRegister);
 682     peek(regT3, OBJECT_OFFSETOF(struct JITStackFrame, vm) / sizeof(void*));
 683     load64(Address(regT3, VM::exceptionOffset()), regT0);
 684     store64(TrustedImm64(JSValue::encode(JSValue())), Address(regT3, VM::exceptionOffset()));
 685     emitPutVirtualRegister(currentInstruction[1].u.operand);
 686 }
 687
 688 void JIT::emit_op_switch_imm(Instruction* currentInstruction)
 689 {
 690     unsigned tableIndex = currentInstruction[1].u.operand;
 691     unsigned defaultOffset = currentInstruction[2].u.operand;
 692     unsigned scrutinee = currentInstruction[3].u.operand;
 693
 694     // create jump table for switch destinations, track this switch statement.
 695     SimpleJumpTable* jumpTable = &m_codeBlock->switchJumpTable(tableIndex);
 696     m_switches.append(SwitchRecord(jumpTable, m_bytecodeOffset, defaultOffset, SwitchRecord::Immediate));
 697     jumpTable->ctiOffsets.grow(jumpTable->branchOffsets.size());
 698
 699     JITStubCall stubCall(this, cti_op_switch_imm);
 700     stubCall.addArgument(scrutinee, regT2);
 701     stubCall.addArgument(TrustedImm32(tableIndex));
 702     stubCall.call();
 703     jump(regT0);
 704 }
 705
 706 void JIT::emit_op_switch_char(Instruction* currentInstruction)
 707 {
 708     unsigned tableIndex = currentInstruction[1].u.operand;
 709     unsigned defaultOffset = currentInstruction[2].u.operand;
 710     unsigned scrutinee = currentInstruction[3].u.operand;
 711
 712     // create jump table for switch destinations, track this switch statement.
 713     SimpleJumpTable* jumpTable = &m_codeBlock->switchJumpTable(tableIndex);
 714     m_switches.append(SwitchRecord(jumpTable, m_bytecodeOffset, defaultOffset, SwitchRecord::Character));
 715     jumpTable->ctiOffsets.grow(jumpTable->branchOffsets.size());
 716
 717     JITStubCall stubCall(this, cti_op_switch_char);
 718     stubCall.addArgument(scrutinee, regT2);
 719     stubCall.addArgument(TrustedImm32(tableIndex));
 720     stubCall.call();
 721     jump(regT0);
 722 }
 723
 724 void JIT::emit_op_switch_string(Instruction* currentInstruction)
 725 {
 726     unsigned tableIndex = currentInstruction[1].u.operand;
 727     unsigned defaultOffset = currentInstruction[2].u.operand;
 728     unsigned scrutinee = currentInstruction[3].u.operand;
 729
 730     // create jump table for switch destinations, track this switch statement.
 731     StringJumpTable* jumpTable = &m_codeBlock->stringSwitchJumpTable(tableIndex);
 732     m_switches.append(SwitchRecord(jumpTable, m_bytecodeOffset, defaultOffset));
 733
 734     JITStubCall stubCall(this, cti_op_switch_string);
 735     stubCall.addArgument(scrutinee, regT2);
 736     stubCall.addArgument(TrustedImm32(tableIndex));
 737     stubCall.call();
 738     jump(regT0);
 739 }
 740
 741 void JIT::emit_op_throw_static_error(Instruction* currentInstruction)
 742 {
 743     JITStubCall stubCall(this, cti_op_throw_static_error);
 744     if (!m_codeBlock->getConstant(currentInstruction[1].u.operand).isNumber())
 745         stubCall.addArgument(TrustedImm64(JSValue::encode(m_codeBlock->getConstant(currentInstruction[1].u.operand))));
 746     else
 747         stubCall.addArgument(Imm64(JSValue::encode(m_codeBlock->getConstant(currentInstruction[1].u.operand))));
 748     stubCall.addArgument(TrustedImm32(currentInstruction[2].u.operand));
 749     stubCall.call();
 750 }
 751
 752 void JIT::emit_op_debug(Instruction* currentInstruction)
 753 {
 754 #if ENABLE(DEBUG_WITH_BREAKPOINT)
 755     UNUSED_PARAM(currentInstruction);
 756     breakpoint();
 757 #else
 758     JITStubCall stubCall(this, cti_op_debug);
 759     stubCall.addArgument(TrustedImm32(currentInstruction[1].u.operand));
 760     stubCall.call();
 761 #endif
 762 }
 763
 764 void JIT::emit_op_eq_null(Instruction* currentInstruction)
 765 {
 766     int dst = currentInstruction[1].u.operand;
 767     int src1 = currentInstruction[2].u.operand;
 768
 769     emitGetVirtualRegister(src1, regT0);
 770     Jump isImmediate = emitJumpIfNotJSCell(regT0);
 771
 772     loadPtr(Address(regT0, JSCell::structureOffset()), regT2);
 773     Jump isMasqueradesAsUndefined = branchTest8(NonZero, Address(regT2, Structure::typeInfoFlagsOffset()), TrustedImm32(MasqueradesAsUndefined));
 774     move(TrustedImm32(0), regT0);
 775     Jump wasNotMasqueradesAsUndefined = jump();
 776
 777     isMasqueradesAsUndefined.link(this);
 778     move(TrustedImmPtr(m_codeBlock->globalObject()), regT0);
 779     loadPtr(Address(regT2, Structure::globalObjectOffset()), regT2);
 780     comparePtr(Equal, regT0, regT2, regT0);
 781     Jump wasNotImmediate = jump();
 782
 783     isImmediate.link(this);
 784
 785     and64(TrustedImm32(~TagBitUndefined), regT0);
 786     compare64(Equal, regT0, TrustedImm32(ValueNull), regT0);
 787
 788     wasNotImmediate.link(this);
 789     wasNotMasqueradesAsUndefined.link(this);
 790
 791     emitTagAsBoolImmediate(regT0);
 792     emitPutVirtualRegister(dst);
 793
 794 }
 795
 796 void JIT::emit_op_neq_null(Instruction* currentInstruction)
 797 {
 798     int dst = currentInstruction[1].u.operand;
 799     int src1 = currentInstruction[2].u.operand;
 800
 801     emitGetVirtualRegister(src1, regT0);
 802     Jump isImmediate = emitJumpIfNotJSCell(regT0);
 803
 804     loadPtr(Address(regT0, JSCell::structureOffset()), regT2);
 805     Jump isMasqueradesAsUndefined = branchTest8(NonZero, Address(regT2, Structure::typeInfoFlagsOffset()), TrustedImm32(MasqueradesAsUndefined));
 806     move(TrustedImm32(1), regT0);
 807     Jump wasNotMasqueradesAsUndefined = jump();
 808
 809     isMasqueradesAsUndefined.link(this);
 810     move(TrustedImmPtr(m_codeBlock->globalObject()), regT0);
 811     loadPtr(Address(regT2, Structure::globalObjectOffset()), regT2);
 812     comparePtr(NotEqual, regT0, regT2, regT0);
 813     Jump wasNotImmediate = jump();
 814
 815     isImmediate.link(this);
 816
 817     and64(TrustedImm32(~TagBitUndefined), regT0);
 818     compare64(NotEqual, regT0, TrustedImm32(ValueNull), regT0);
 819
 820     wasNotImmediate.link(this);
 821     wasNotMasqueradesAsUndefined.link(this);
 822
 823     emitTagAsBoolImmediate(regT0);
 824     emitPutVirtualRegister(dst);
 825 }
 826
 827 void JIT::emit_op_enter(Instruction*)
 828 {
 829     emitEnterOptimizationCheck();
 830
 831     // Even though CTI doesn't use them, we initialize our constant
 832     // registers to zap stale pointers, to avoid unnecessarily prolonging
 833     // object lifetime and increasing GC pressure.
 834     size_t count = m_codeBlock->m_numVars;
 835     for (size_t j = 0; j < count; ++j)
 836         emitInitRegister(localToOperand(j));
 837 }
 838
 839 void JIT::emit_op_create_activation(Instruction* currentInstruction)
 840 {
 841     int dst = currentInstruction[1].u.operand;
 842
 843     Jump activationCreated = branchTest64(NonZero, Address(callFrameRegister, sizeof(Register) * dst));
 844     JITStubCall(this, cti_op_push_activation).call(dst);
 845     activationCreated.link(this);
 846 }
 847
 848 void JIT::emit_op_create_arguments(Instruction* currentInstruction)
 849 {
 850     int dst = currentInstruction[1].u.operand;
 851
 852     Jump argsCreated = branchTest64(NonZero, Address(callFrameRegister, sizeof(Register) * dst));
 853     JITStubCall(this, cti_op_create_arguments).call();
 854     emitPutVirtualRegister(dst);
 855     emitPutVirtualRegister(unmodifiedArgumentsRegister(dst));
 856     argsCreated.link(this);
 857 }
 858
 859 void JIT::emit_op_init_lazy_reg(Instruction* currentInstruction)
 860 {
 861     int dst = currentInstruction[1].u.operand;
 862
 863     store64(TrustedImm64((int64_t)0), Address(callFrameRegister, sizeof(Register) * dst));
 864 }
 865
 866 void JIT::emit_op_to_this(Instruction* currentInstruction)
 867 {
 868     WriteBarrierBase<Structure>* cachedStructure = &currentInstruction[2].u.structure;
 869     emitGetVirtualRegister(currentInstruction[1].u.operand, regT1);
 870
 871     emitJumpSlowCaseIfNotJSCell(regT1);
 872     loadPtr(Address(regT1, JSCell::structureOffset()), regT0);
 873
 874     addSlowCase(branch8(NotEqual, Address(regT0, Structure::typeInfoTypeOffset()), TrustedImm32(FinalObjectType)));
 875     loadPtr(cachedStructure, regT2);
 876     addSlowCase(branchPtr(NotEqual, regT0, regT2));
 877 }
 878
 879 void JIT::emit_op_get_callee(Instruction* currentInstruction)
 880 {
 881     int result = currentInstruction[1].u.operand;
 882     WriteBarrierBase<JSCell>* cachedFunction = &currentInstruction[2].u.jsCell;
 883     emitGetFromCallFrameHeaderPtr(JSStack::Callee, regT0);
 884
 885     loadPtr(cachedFunction, regT2);
 886     addSlowCase(branchPtr(NotEqual, regT0, regT2));
 887
 888     emitPutVirtualRegister(result);
 889 }
 890
 891 void JIT::emitSlow_op_get_callee(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
 892 {
 893     linkSlowCase(iter);
 894
 895     JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_get_callee);
 896     slowPathCall.call();
 897     emitGetVirtualRegister(currentInstruction[1].u.operand, regT0);
 898 }
 899
 900 void JIT::emit_op_create_this(Instruction* currentInstruction)
 901 {
 902     int callee = currentInstruction[2].u.operand;
 903     RegisterID calleeReg = regT0;
 904     RegisterID resultReg = regT0;
 905     RegisterID allocatorReg = regT1;
 906     RegisterID structureReg = regT2;
 907     RegisterID scratchReg = regT3;
 908
 909     emitGetVirtualRegister(callee, calleeReg);
 910     loadPtr(Address(calleeReg, JSFunction::offsetOfAllocationProfile() + ObjectAllocationProfile::offsetOfAllocator()), allocatorReg);
 911     loadPtr(Address(calleeReg, JSFunction::offsetOfAllocationProfile() + ObjectAllocationProfile::offsetOfStructure()), structureReg);
 912     addSlowCase(branchTestPtr(Zero, allocatorReg));
 913
 914     emitAllocateJSObject(allocatorReg, structureReg, resultReg, scratchReg);
 915     emitPutVirtualRegister(currentInstruction[1].u.operand);
 916 }
 917
 918 void JIT::emitSlow_op_create_this(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
 919 {
 920     linkSlowCase(iter); // doesn't have an allocation profile
 921     linkSlowCase(iter); // allocation failed
 922
 923     JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_create_this);
 924     slowPathCall.call();
 925     emitGetVirtualRegister(currentInstruction[1].u.operand, regT0);
 926 }
 927
 928 void JIT::emit_op_profile_will_call(Instruction* currentInstruction)
 929 {
 930     JITStubCall stubCall(this, cti_op_profile_will_call);
 931     stubCall.addArgument(currentInstruction[1].u.operand, regT1);
 932     stubCall.call();
 933 }
 934
 935 void JIT::emit_op_profile_did_call(Instruction* currentInstruction)
 936 {
 937     JITStubCall stubCall(this, cti_op_profile_did_call);
 938     stubCall.addArgument(currentInstruction[1].u.operand, regT1);
 939     stubCall.call();
 940 }
 941
 942
 943 // Slow cases
 944
 945 void JIT::emitSlow_op_to_this(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
 946 {
 947     linkSlowCase(iter);
 948     linkSlowCase(iter);
 949     linkSlowCase(iter);
 950
 951     JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_to_this);
 952     slowPathCall.call();
 953     emitGetVirtualRegister(currentInstruction[1].u.operand, regT0);
 954 }
 955
 956 void JIT::emitSlow_op_to_primitive(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
 957 {
 958     linkSlowCase(iter);
 959
 960     JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_to_primitive);
 961     slowPathCall.call();
 962     emitGetVirtualRegister(currentInstruction[1].u.operand, regT0);
 963 }
 964
 965 void JIT::emitSlow_op_not(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
 966 {
 967     linkSlowCase(iter);
 968
 969     JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_not);
 970     slowPathCall.call();
 971     emitGetVirtualRegister(currentInstruction[1].u.operand, regT0);
 972 }
 973
 974 void JIT::emitSlow_op_jfalse(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
 975 {
 976     linkSlowCase(iter);
 977     JITStubCall stubCall(this, cti_op_jtrue);
 978     stubCall.addArgument(regT0);
 979     stubCall.call();
 980     emitJumpSlowToHot(branchTest32(Zero, regT0), currentInstruction[2].u.operand); // inverted!
 981 }
 982
 983 void JIT::emitSlow_op_jtrue(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
 984 {
 985     linkSlowCase(iter);
 986     JITStubCall stubCall(this, cti_op_jtrue);
 987     stubCall.addArgument(regT0);
 988     stubCall.call();
 989     emitJumpSlowToHot(branchTest32(NonZero, regT0), currentInstruction[2].u.operand);
 990 }
 991
 992 void JIT::emitSlow_op_bitxor(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
 993 {
 994     linkSlowCase(iter);
 995     JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_bitxor);
 996     slowPathCall.call();
 997     emitGetVirtualRegister(currentInstruction[1].u.operand, regT0);
 998 }
 999
1000 void JIT::emitSlow_op_bitor(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1001 {
1002     linkSlowCase(iter);
1003     JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_bitor);
1004     slowPathCall.call();
1005     emitGetVirtualRegister(currentInstruction[1].u.operand, regT0);
1006 }
1007
1008 void JIT::emitSlow_op_eq(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1009 {
1010     linkSlowCase(iter);
1011     JITStubCall stubCall(this, cti_op_eq);
1012     stubCall.addArgument(regT0);
1013     stubCall.addArgument(regT1);
1014     stubCall.call();
1015     emitTagAsBoolImmediate(regT0);
1016     emitPutVirtualRegister(currentInstruction[1].u.operand);
1017 }
1018
1019 void JIT::emitSlow_op_neq(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1020 {
1021     linkSlowCase(iter);
1022     JITStubCall stubCall(this, cti_op_eq);
1023     stubCall.addArgument(regT0);
1024     stubCall.addArgument(regT1);
1025     stubCall.call();
1026     xor32(TrustedImm32(0x1), regT0);
1027     emitTagAsBoolImmediate(regT0);
1028     emitPutVirtualRegister(currentInstruction[1].u.operand);
1029 }
1030
1031 void JIT::emitSlow_op_stricteq(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1032 {
1033     linkSlowCase(iter);
1034     linkSlowCase(iter);
1035     linkSlowCase(iter);
1036     JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_stricteq);
1037     slowPathCall.call();
1038     emitGetVirtualRegister(currentInstruction[1].u.operand, regT0);
1039 }
1040
1041 void JIT::emitSlow_op_nstricteq(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1042 {
1043     linkSlowCase(iter);
1044     linkSlowCase(iter);
1045     linkSlowCase(iter);
1046     JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_nstricteq);
1047     slowPathCall.call();
1048     emitGetVirtualRegister(currentInstruction[1].u.operand, regT0);
1049 }
1050
1051 void JIT::emitSlow_op_check_has_instance(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1052 {
1053     int dst = currentInstruction[1].u.operand;
1054     int value = currentInstruction[2].u.operand;
1055     int baseVal = currentInstruction[3].u.operand;
1056
1057     linkSlowCaseIfNotJSCell(iter, baseVal);
1058     linkSlowCase(iter);
1059     JITStubCall stubCall(this, cti_op_check_has_instance);
1060     stubCall.addArgument(value, regT2);
1061     stubCall.addArgument(baseVal, regT2);
1062     stubCall.call(dst);
1063
1064     emitJumpSlowToHot(jump(), currentInstruction[4].u.operand);
1065 }
1066
1067 void JIT::emitSlow_op_instanceof(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1068 {
1069     int dst = currentInstruction[1].u.operand;
1070     int value = currentInstruction[2].u.operand;
1071     int proto = currentInstruction[3].u.operand;
1072
1073     linkSlowCaseIfNotJSCell(iter, value);
1074     linkSlowCaseIfNotJSCell(iter, proto);
1075     linkSlowCase(iter);
1076     JITStubCall stubCall(this, cti_op_instanceof);
1077     stubCall.addArgument(value, regT2);
1078     stubCall.addArgument(proto, regT2);
1079     stubCall.call(dst);
1080 }
1081
1082 void JIT::emitSlow_op_to_number(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1083 {
1084     linkSlowCase(iter);
1085
1086     JITSlowPathCall slowPathCall(this, currentInstruction, slow_path_to_number);
1087     slowPathCall.call();
1088     emitGetVirtualRegister(currentInstruction[1].u.operand, regT0);
1089 }
1090
1091 void JIT::emit_op_get_arguments_length(Instruction* currentInstruction)
1092 {
1093     int dst = currentInstruction[1].u.operand;
1094     int argumentsRegister = currentInstruction[2].u.operand;
1095     addSlowCase(branchTest64(NonZero, addressFor(argumentsRegister)));
1096     emitGetFromCallFrameHeader32(JSStack::ArgumentCount, regT0);
1097     sub32(TrustedImm32(1), regT0);
1098     emitFastArithReTagImmediate(regT0, regT0);
1099     emitPutVirtualRegister(dst, regT0);
1100 }
1101
1102 void JIT::emitSlow_op_get_arguments_length(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1103 {
1104     linkSlowCase(iter);
1105     int dst = currentInstruction[1].u.operand;
1106     int base = currentInstruction[2].u.operand;
1107     const Identifier* ident = &(m_codeBlock->identifier(currentInstruction[3].u.operand));
1108
1109     emitGetVirtualRegister(base, regT0);
1110     JITStubCall stubCall(this, cti_op_get_by_id_generic);
1111     stubCall.addArgument(regT0);
1112     stubCall.addArgument(TrustedImmPtr(ident));
1113     stubCall.call(dst);
1114 }
1115
1116 void JIT::emit_op_get_argument_by_val(Instruction* currentInstruction)
1117 {
1118     int dst = currentInstruction[1].u.operand;
1119     int argumentsRegister = currentInstruction[2].u.operand;
1120     int property = currentInstruction[3].u.operand;
1121     addSlowCase(branchTest64(NonZero, addressFor(argumentsRegister)));
1122     emitGetVirtualRegister(property, regT1);
1123     addSlowCase(emitJumpIfNotImmediateInteger(regT1));
1124     add32(TrustedImm32(1), regT1);
1125     // regT1 now contains the integer index of the argument we want, including this
1126     emitGetFromCallFrameHeader32(JSStack::ArgumentCount, regT2);
1127     addSlowCase(branch32(AboveOrEqual, regT1, regT2));
1128
1129     signExtend32ToPtr(regT1, regT1);
1130     load64(BaseIndex(callFrameRegister, regT1, TimesEight, CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register))), regT0);
1131     emitValueProfilingSite(regT4);
1132     emitPutVirtualRegister(dst, regT0);
1133 }
1134
1135 void JIT::emitSlow_op_get_argument_by_val(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
1136 {
1137     int dst = currentInstruction[1].u.operand;
1138     int arguments = currentInstruction[2].u.operand;
1139     int property = currentInstruction[3].u.operand;
1140
1141     linkSlowCase(iter);
1142     Jump skipArgumentsCreation = jump();
1143
1144     linkSlowCase(iter);
1145     linkSlowCase(iter);
1146     JITStubCall(this, cti_op_create_arguments).call();
1147     emitPutVirtualRegister(arguments);
1148     emitPutVirtualRegister(unmodifiedArgumentsRegister(arguments));
1149
1150     skipArgumentsCreation.link(this);
1151     JITStubCall stubCall(this, cti_op_get_by_val_generic);
1152     stubCall.addArgument(arguments, regT2);
1153     stubCall.addArgument(property, regT2);
1154     stubCall.callWithValueProfiling(dst);
1155 }
1156
1157 #endif // USE(JSVALUE64)
1158
1159 void JIT::emit_op_loop_hint(Instruction*)
1160 {
1161     // Emit the JIT optimization check:
1162     if (canBeOptimized()) {
1163         if (Options::enableOSREntryInLoops()) {
1164             addSlowCase(branchAdd32(PositiveOrZero, TrustedImm32(Options::executionCounterIncrementForLoop()),
1165                 AbsoluteAddress(m_codeBlock->addressOfJITExecuteCounter())));
1166         } else {
1167             // Add with saturation.
1168             move(TrustedImmPtr(m_codeBlock->addressOfJITExecuteCounter()), regT3);
1169             load32(regT3, regT2);
1170             Jump dontAdd = branch32(
1171                 GreaterThan, regT2,
1172                 TrustedImm32(std::numeric_limits<int32_t>::max() - Options::executionCounterIncrementForLoop()));
1173             add32(TrustedImm32(Options::executionCounterIncrementForLoop()), regT2);
1174             store32(regT2, regT3);
1175             dontAdd.link(this);
1176         }
1177     }
1178
1179     // Emit the watchdog timer check:
1180     if (m_vm->watchdog.isEnabled())
1181         addSlowCase(branchTest8(NonZero, AbsoluteAddress(m_vm->watchdog.timerDidFireAddress())));
1182 }
1183
1184 void JIT::emitSlow_op_loop_hint(Instruction*, Vector<SlowCaseEntry>::iterator& iter)
1185 {
1186 #if ENABLE(DFG_JIT)
1187     // Emit the slow path for the JIT optimization check:
1188     if (canBeOptimized() && Options::enableOSREntryInLoops()) {
1189         linkSlowCase(iter);
1190
1191         JITStubCall stubCall(this, cti_optimize);
1192         stubCall.addArgument(TrustedImm32(m_bytecodeOffset));
1193         stubCall.call();
1194
1195         emitJumpSlowToHot(jump(), OPCODE_LENGTH(op_loop_hint));
1196     }
1197 #endif
1198
1199     // Emit the slow path of the watchdog timer check:
1200     if (m_vm->watchdog.isEnabled()) {
1201         linkSlowCase(iter);
1202
1203         JITStubCall stubCall(this, cti_handle_watchdog_timer);
1204         stubCall.call();
1205
1206         emitJumpSlowToHot(jump(), OPCODE_LENGTH(op_loop_hint));
1207     }
1208
1209 }
1210
1211 void JIT::emit_op_new_regexp(Instruction* currentInstruction)
1212 {
1213     JITStubCall stubCall(this, cti_op_new_regexp);
1214     stubCall.addArgument(TrustedImmPtr(m_codeBlock->regexp(currentInstruction[2].u.operand)));
1215     stubCall.call(currentInstruction[1].u.operand);
1216 }
1217
1218 void JIT::emit_op_new_func(Instruction* currentInstruction)
1219 {
1220     Jump lazyJump;
1221     int dst = currentInstruction[1].u.operand;
1222     if (currentInstruction[3].u.operand) {
1223 #if USE(JSVALUE32_64)
1224         lazyJump = branch32(NotEqual, tagFor(dst), TrustedImm32(JSValue::EmptyValueTag));
1225 #else
1226         lazyJump = branchTest64(NonZero, addressFor(dst));
1227 #endif
1228     }
1229
1230     JITStubCall stubCall(this, cti_op_new_func);
1231     stubCall.addArgument(TrustedImmPtr(m_codeBlock->functionDecl(currentInstruction[2].u.operand)));
1232     stubCall.call(dst);
1233
1234     if (currentInstruction[3].u.operand) {
1235 #if USE(JSVALUE32_64)
1236         unmap();
1237 #else
1238         killLastResultRegister();
1239 #endif
1240         lazyJump.link(this);
1241     }
1242 }
1243
1244 void JIT::emit_op_new_func_exp(Instruction* currentInstruction)
1245 {
1246     JITStubCall stubCall(this, cti_op_new_func_exp);
1247     stubCall.addArgument(TrustedImmPtr(m_codeBlock->functionExpr(currentInstruction[2].u.operand)));
1248     stubCall.call(currentInstruction[1].u.operand);
1249 }
1250
1251 void JIT::emit_op_new_array(Instruction* currentInstruction)
1252 {
1253     JITStubCall stubCall(this, cti_op_new_array);
1254     stubCall.addArgument(TrustedImm32(currentInstruction[2].u.operand));
1255     stubCall.addArgument(TrustedImm32(currentInstruction[3].u.operand));
1256     stubCall.addArgument(TrustedImmPtr(currentInstruction[4].u.arrayAllocationProfile));
1257     stubCall.call(currentInstruction[1].u.operand);
1258 }
1259
1260 void JIT::emit_op_new_array_with_size(Instruction* currentInstruction)
1261 {
1262     JITStubCall stubCall(this, cti_op_new_array_with_size);
1263 #if USE(JSVALUE64)
1264     stubCall.addArgument(currentInstruction[2].u.operand, regT2);
1265 #else
1266     stubCall.addArgument(currentInstruction[2].u.operand);
1267 #endif
1268     stubCall.addArgument(TrustedImmPtr(currentInstruction[3].u.arrayAllocationProfile));
1269     stubCall.call(currentInstruction[1].u.operand);
1270 }
1271
1272 void JIT::emit_op_new_array_buffer(Instruction* currentInstruction)
1273 {
1274     JITStubCall stubCall(this, cti_op_new_array_buffer);
1275     stubCall.addArgument(TrustedImm32(currentInstruction[2].u.operand));
1276     stubCall.addArgument(TrustedImm32(currentInstruction[3].u.operand));
1277     stubCall.addArgument(TrustedImmPtr(currentInstruction[4].u.arrayAllocationProfile));
1278     stubCall.call(currentInstruction[1].u.operand);
1279 }
1280
1281 } // namespace JSC
1282
1283 #endif // ENABLE(JIT)