jit/JIT.cpp

   1 /*
   2  * Copyright (C) 2008, 2009 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "config.h"
  27 #include "JIT.h"
  28
  29 // This probably does not belong here; adding here for now as a quick Windows build fix.
  30 #if ENABLE(ASSEMBLER) && CPU(X86) && !OS(MAC_OS_X)
  31 #include "MacroAssembler.h"
  32 JSC::MacroAssemblerX86Common::SSE2CheckState JSC::MacroAssemblerX86Common::s_sse2CheckState = NotCheckedSSE2;
  33 #endif
  34
  35 #if ENABLE(JIT)
  36
  37 #include "CodeBlock.h"
  38 #include "Interpreter.h"
  39 #include "JITInlineMethods.h"
  40 #include "JITStubCall.h"
  41 #include "JSArray.h"
  42 #include "JSFunction.h"
  43 #include "LinkBuffer.h"
  44 #include "RepatchBuffer.h"
  45 #include "ResultType.h"
  46 #include "SamplingTool.h"
  47
  48 #ifndef NDEBUG
  49 #include <stdio.h>
  50 #endif
  51
  52 using namespace std;
  53
  54 namespace JSC {
  55
  56 void ctiPatchNearCallByReturnAddress(CodeBlock* codeblock, ReturnAddressPtr returnAddress, MacroAssemblerCodePtr newCalleeFunction)
  57 {
  58     RepatchBuffer repatchBuffer(codeblock);
  59     repatchBuffer.relinkNearCallerToTrampoline(returnAddress, newCalleeFunction);
  60 }
  61
  62 void ctiPatchCallByReturnAddress(CodeBlock* codeblock, ReturnAddressPtr returnAddress, MacroAssemblerCodePtr newCalleeFunction)
  63 {
  64     RepatchBuffer repatchBuffer(codeblock);
  65     repatchBuffer.relinkCallerToTrampoline(returnAddress, newCalleeFunction);
  66 }
  67
  68 void ctiPatchCallByReturnAddress(CodeBlock* codeblock, ReturnAddressPtr returnAddress, FunctionPtr newCalleeFunction)
  69 {
  70     RepatchBuffer repatchBuffer(codeblock);
  71     repatchBuffer.relinkCallerToFunction(returnAddress, newCalleeFunction);
  72 }
  73
  74 JIT::JIT(JSGlobalData* globalData, CodeBlock* codeBlock)
  75     : m_interpreter(globalData->interpreter)
  76     , m_globalData(globalData)
  77     , m_codeBlock(codeBlock)
  78     , m_labels(codeBlock ? codeBlock->instructions().size() : 0)
  79     , m_propertyAccessCompilationInfo(codeBlock ? codeBlock->numberOfStructureStubInfos() : 0)
  80     , m_callStructureStubCompilationInfo(codeBlock ? codeBlock->numberOfCallLinkInfos() : 0)
  81     , m_bytecodeIndex((unsigned)-1)
  82 #if USE(JSVALUE32_64)
  83     , m_jumpTargetIndex(0)
  84     , m_mappedBytecodeIndex((unsigned)-1)
  85     , m_mappedVirtualRegisterIndex((unsigned)-1)
  86     , m_mappedTag((RegisterID)-1)
  87     , m_mappedPayload((RegisterID)-1)
  88 #else
  89     , m_lastResultBytecodeRegister(std::numeric_limits<int>::max())
  90     , m_jumpTargetsPosition(0)
  91 #endif
  92 {
  93 }
  94
  95 #if USE(JSVALUE32_64)
  96 void JIT::emitTimeoutCheck()
  97 {
  98     Jump skipTimeout = branchSub32(NonZero, Imm32(1), timeoutCheckRegister);
  99     JITStubCall stubCall(this, cti_timeout_check);
 100     stubCall.addArgument(regT1, regT0); // save last result registers.
 101     stubCall.call(timeoutCheckRegister);
 102     stubCall.getArgument(0, regT1, regT0); // reload last result registers.
 103     skipTimeout.link(this);
 104 }
 105 #else
 106 void JIT::emitTimeoutCheck()
 107 {
 108     Jump skipTimeout = branchSub32(NonZero, Imm32(1), timeoutCheckRegister);
 109     JITStubCall(this, cti_timeout_check).call(timeoutCheckRegister);
 110     skipTimeout.link(this);
 111
 112     killLastResultRegister();
 113 }
 114 #endif
 115
 116 #define NEXT_OPCODE(name) \
 117     m_bytecodeIndex += OPCODE_LENGTH(name); \
 118     break;
 119
 120 #if USE(JSVALUE32_64)
 121 #define DEFINE_BINARY_OP(name) \
 122     case name: { \
 123         JITStubCall stubCall(this, cti_##name); \
 124         stubCall.addArgument(currentInstruction[2].u.operand); \
 125         stubCall.addArgument(currentInstruction[3].u.operand); \
 126         stubCall.call(currentInstruction[1].u.operand); \
 127         NEXT_OPCODE(name); \
 128     }
 129
 130 #define DEFINE_UNARY_OP(name) \
 131     case name: { \
 132         JITStubCall stubCall(this, cti_##name); \
 133         stubCall.addArgument(currentInstruction[2].u.operand); \
 134         stubCall.call(currentInstruction[1].u.operand); \
 135         NEXT_OPCODE(name); \
 136     }
 137
 138 #else // USE(JSVALUE32_64)
 139
 140 #define DEFINE_BINARY_OP(name) \
 141     case name: { \
 142         JITStubCall stubCall(this, cti_##name); \
 143         stubCall.addArgument(currentInstruction[2].u.operand, regT2); \
 144         stubCall.addArgument(currentInstruction[3].u.operand, regT2); \
 145         stubCall.call(currentInstruction[1].u.operand); \
 146         NEXT_OPCODE(name); \
 147     }
 148
 149 #define DEFINE_UNARY_OP(name) \
 150     case name: { \
 151         JITStubCall stubCall(this, cti_##name); \
 152         stubCall.addArgument(currentInstruction[2].u.operand, regT2); \
 153         stubCall.call(currentInstruction[1].u.operand); \
 154         NEXT_OPCODE(name); \
 155     }
 156 #endif // USE(JSVALUE32_64)
 157
 158 #define DEFINE_OP(name) \
 159     case name: { \
 160         emit_##name(currentInstruction); \
 161         NEXT_OPCODE(name); \
 162     }
 163
 164 #define DEFINE_SLOWCASE_OP(name) \
 165     case name: { \
 166         emitSlow_##name(currentInstruction, iter); \
 167         NEXT_OPCODE(name); \
 168     }
 169
 170 void JIT::privateCompileMainPass()
 171 {
 172     Instruction* instructionsBegin = m_codeBlock->instructions().begin();
 173     unsigned instructionCount = m_codeBlock->instructions().size();
 174
 175     m_propertyAccessInstructionIndex = 0;
 176     m_globalResolveInfoIndex = 0;
 177     m_callLinkInfoIndex = 0;
 178
 179     for (m_bytecodeIndex = 0; m_bytecodeIndex < instructionCount; ) {
 180         Instruction* currentInstruction = instructionsBegin + m_bytecodeIndex;
 181         ASSERT_WITH_MESSAGE(m_interpreter->isOpcode(currentInstruction->u.opcode), "privateCompileMainPass gone bad @ %d", m_bytecodeIndex);
 182
 183 #if ENABLE(OPCODE_SAMPLING)
 184         if (m_bytecodeIndex > 0) // Avoid the overhead of sampling op_enter twice.
 185             sampleInstruction(currentInstruction);
 186 #endif
 187
 188 #if !USE(JSVALUE32_64)
 189         if (m_labels[m_bytecodeIndex].isUsed())
 190             killLastResultRegister();
 191 #endif
 192
 193         m_labels[m_bytecodeIndex] = label();
 194
 195         switch (m_interpreter->getOpcodeID(currentInstruction->u.opcode)) {
 196         DEFINE_BINARY_OP(op_del_by_val)
 197 #if USE(JSVALUE32)
 198         DEFINE_BINARY_OP(op_div)
 199 #endif
 200         DEFINE_BINARY_OP(op_in)
 201         DEFINE_BINARY_OP(op_less)
 202         DEFINE_BINARY_OP(op_lesseq)
 203         DEFINE_UNARY_OP(op_is_boolean)
 204         DEFINE_UNARY_OP(op_is_function)
 205         DEFINE_UNARY_OP(op_is_number)
 206         DEFINE_UNARY_OP(op_is_object)
 207         DEFINE_UNARY_OP(op_is_string)
 208         DEFINE_UNARY_OP(op_is_undefined)
 209 #if !USE(JSVALUE32_64)
 210         DEFINE_UNARY_OP(op_negate)
 211 #endif
 212         DEFINE_UNARY_OP(op_typeof)
 213
 214         DEFINE_OP(op_add)
 215         DEFINE_OP(op_bitand)
 216         DEFINE_OP(op_bitnot)
 217         DEFINE_OP(op_bitor)
 218         DEFINE_OP(op_bitxor)
 219         DEFINE_OP(op_call)
 220         DEFINE_OP(op_call_eval)
 221         DEFINE_OP(op_call_varargs)
 222         DEFINE_OP(op_catch)
 223         DEFINE_OP(op_construct)
 224         DEFINE_OP(op_construct_verify)
 225         DEFINE_OP(op_convert_this)
 226         DEFINE_OP(op_init_arguments)
 227         DEFINE_OP(op_create_arguments)
 228         DEFINE_OP(op_debug)
 229         DEFINE_OP(op_del_by_id)
 230 #if !USE(JSVALUE32)
 231         DEFINE_OP(op_div)
 232 #endif
 233         DEFINE_OP(op_end)
 234         DEFINE_OP(op_enter)
 235         DEFINE_OP(op_enter_with_activation)
 236         DEFINE_OP(op_eq)
 237         DEFINE_OP(op_eq_null)
 238         DEFINE_OP(op_get_by_id)
 239         DEFINE_OP(op_get_by_val)
 240         DEFINE_OP(op_get_by_pname)
 241         DEFINE_OP(op_get_global_var)
 242         DEFINE_OP(op_get_pnames)
 243         DEFINE_OP(op_get_scoped_var)
 244         DEFINE_OP(op_instanceof)
 245         DEFINE_OP(op_jeq_null)
 246         DEFINE_OP(op_jfalse)
 247         DEFINE_OP(op_jmp)
 248         DEFINE_OP(op_jmp_scopes)
 249         DEFINE_OP(op_jneq_null)
 250         DEFINE_OP(op_jneq_ptr)
 251         DEFINE_OP(op_jnless)
 252         DEFINE_OP(op_jless)
 253         DEFINE_OP(op_jlesseq)
 254         DEFINE_OP(op_jnlesseq)
 255         DEFINE_OP(op_jsr)
 256         DEFINE_OP(op_jtrue)
 257         DEFINE_OP(op_load_varargs)
 258         DEFINE_OP(op_loop)
 259         DEFINE_OP(op_loop_if_less)
 260         DEFINE_OP(op_loop_if_lesseq)
 261         DEFINE_OP(op_loop_if_true)
 262         DEFINE_OP(op_loop_if_false)
 263         DEFINE_OP(op_lshift)
 264         DEFINE_OP(op_method_check)
 265         DEFINE_OP(op_mod)
 266         DEFINE_OP(op_mov)
 267         DEFINE_OP(op_mul)
 268 #if USE(JSVALUE32_64)
 269         DEFINE_OP(op_negate)
 270 #endif
 271         DEFINE_OP(op_neq)
 272         DEFINE_OP(op_neq_null)
 273         DEFINE_OP(op_new_array)
 274         DEFINE_OP(op_new_error)
 275         DEFINE_OP(op_new_func)
 276         DEFINE_OP(op_new_func_exp)
 277         DEFINE_OP(op_new_object)
 278         DEFINE_OP(op_new_regexp)
 279         DEFINE_OP(op_next_pname)
 280         DEFINE_OP(op_not)
 281         DEFINE_OP(op_nstricteq)
 282         DEFINE_OP(op_pop_scope)
 283         DEFINE_OP(op_post_dec)
 284         DEFINE_OP(op_post_inc)
 285         DEFINE_OP(op_pre_dec)
 286         DEFINE_OP(op_pre_inc)
 287         DEFINE_OP(op_profile_did_call)
 288         DEFINE_OP(op_profile_will_call)
 289         DEFINE_OP(op_push_new_scope)
 290         DEFINE_OP(op_push_scope)
 291         DEFINE_OP(op_put_by_id)
 292         DEFINE_OP(op_put_by_index)
 293         DEFINE_OP(op_put_by_val)
 294         DEFINE_OP(op_put_getter)
 295         DEFINE_OP(op_put_global_var)
 296         DEFINE_OP(op_put_scoped_var)
 297         DEFINE_OP(op_put_setter)
 298         DEFINE_OP(op_resolve)
 299         DEFINE_OP(op_resolve_base)
 300         DEFINE_OP(op_resolve_global)
 301         DEFINE_OP(op_resolve_global_dynamic)
 302         DEFINE_OP(op_resolve_skip)
 303         DEFINE_OP(op_resolve_with_base)
 304         DEFINE_OP(op_ret)
 305         DEFINE_OP(op_rshift)
 306         DEFINE_OP(op_urshift)
 307         DEFINE_OP(op_sret)
 308         DEFINE_OP(op_strcat)
 309         DEFINE_OP(op_stricteq)
 310         DEFINE_OP(op_sub)
 311         DEFINE_OP(op_switch_char)
 312         DEFINE_OP(op_switch_imm)
 313         DEFINE_OP(op_switch_string)
 314         DEFINE_OP(op_tear_off_activation)
 315         DEFINE_OP(op_tear_off_arguments)
 316         DEFINE_OP(op_throw)
 317         DEFINE_OP(op_to_jsnumber)
 318         DEFINE_OP(op_to_primitive)
 319
 320         case op_get_array_length:
 321         case op_get_by_id_chain:
 322         case op_get_by_id_generic:
 323         case op_get_by_id_proto:
 324         case op_get_by_id_proto_list:
 325         case op_get_by_id_self:
 326         case op_get_by_id_self_list:
 327         case op_get_by_id_getter_chain:
 328         case op_get_by_id_getter_proto:
 329         case op_get_by_id_getter_proto_list:
 330         case op_get_by_id_getter_self:
 331         case op_get_by_id_getter_self_list:
 332         case op_get_by_id_custom_chain:
 333         case op_get_by_id_custom_proto:
 334         case op_get_by_id_custom_proto_list:
 335         case op_get_by_id_custom_self:
 336         case op_get_by_id_custom_self_list:
 337         case op_get_string_length:
 338         case op_put_by_id_generic:
 339         case op_put_by_id_replace:
 340         case op_put_by_id_transition:
 341             ASSERT_NOT_REACHED();
 342         }
 343     }
 344
 345     ASSERT(m_propertyAccessInstructionIndex == m_codeBlock->numberOfStructureStubInfos());
 346     ASSERT(m_callLinkInfoIndex == m_codeBlock->numberOfCallLinkInfos());
 347
 348 #ifndef NDEBUG
 349     // Reset this, in order to guard its use with ASSERTs.
 350     m_bytecodeIndex = (unsigned)-1;
 351 #endif
 352 }
 353
 354
 355 void JIT::privateCompileLinkPass()
 356 {
 357     unsigned jmpTableCount = m_jmpTable.size();
 358     for (unsigned i = 0; i < jmpTableCount; ++i)
 359         m_jmpTable[i].from.linkTo(m_labels[m_jmpTable[i].toBytecodeIndex], this);
 360     m_jmpTable.clear();
 361 }
 362
 363 void JIT::privateCompileSlowCases()
 364 {
 365     Instruction* instructionsBegin = m_codeBlock->instructions().begin();
 366
 367     m_propertyAccessInstructionIndex = 0;
 368     m_globalResolveInfoIndex = 0;
 369     m_callLinkInfoIndex = 0;
 370
 371     for (Vector<SlowCaseEntry>::iterator iter = m_slowCases.begin(); iter != m_slowCases.end();) {
 372 #if !USE(JSVALUE32_64)
 373         killLastResultRegister();
 374 #endif
 375
 376         m_bytecodeIndex = iter->to;
 377 #ifndef NDEBUG
 378         unsigned firstTo = m_bytecodeIndex;
 379 #endif
 380         Instruction* currentInstruction = instructionsBegin + m_bytecodeIndex;
 381
 382         switch (m_interpreter->getOpcodeID(currentInstruction->u.opcode)) {
 383         DEFINE_SLOWCASE_OP(op_add)
 384         DEFINE_SLOWCASE_OP(op_bitand)
 385         DEFINE_SLOWCASE_OP(op_bitnot)
 386         DEFINE_SLOWCASE_OP(op_bitor)
 387         DEFINE_SLOWCASE_OP(op_bitxor)
 388         DEFINE_SLOWCASE_OP(op_call)
 389         DEFINE_SLOWCASE_OP(op_call_eval)
 390         DEFINE_SLOWCASE_OP(op_call_varargs)
 391         DEFINE_SLOWCASE_OP(op_construct)
 392         DEFINE_SLOWCASE_OP(op_construct_verify)
 393         DEFINE_SLOWCASE_OP(op_convert_this)
 394 #if !USE(JSVALUE32)
 395         DEFINE_SLOWCASE_OP(op_div)
 396 #endif
 397         DEFINE_SLOWCASE_OP(op_eq)
 398         DEFINE_SLOWCASE_OP(op_get_by_id)
 399         DEFINE_SLOWCASE_OP(op_get_by_val)
 400         DEFINE_SLOWCASE_OP(op_get_by_pname)
 401         DEFINE_SLOWCASE_OP(op_instanceof)
 402         DEFINE_SLOWCASE_OP(op_jfalse)
 403         DEFINE_SLOWCASE_OP(op_jnless)
 404         DEFINE_SLOWCASE_OP(op_jless)
 405         DEFINE_SLOWCASE_OP(op_jlesseq)
 406         DEFINE_SLOWCASE_OP(op_jnlesseq)
 407         DEFINE_SLOWCASE_OP(op_jtrue)
 408         DEFINE_SLOWCASE_OP(op_loop_if_less)
 409         DEFINE_SLOWCASE_OP(op_loop_if_lesseq)
 410         DEFINE_SLOWCASE_OP(op_loop_if_true)
 411         DEFINE_SLOWCASE_OP(op_loop_if_false)
 412         DEFINE_SLOWCASE_OP(op_lshift)
 413         DEFINE_SLOWCASE_OP(op_method_check)
 414         DEFINE_SLOWCASE_OP(op_mod)
 415         DEFINE_SLOWCASE_OP(op_mul)
 416 #if USE(JSVALUE32_64)
 417         DEFINE_SLOWCASE_OP(op_negate)
 418 #endif
 419         DEFINE_SLOWCASE_OP(op_neq)
 420         DEFINE_SLOWCASE_OP(op_not)
 421         DEFINE_SLOWCASE_OP(op_nstricteq)
 422         DEFINE_SLOWCASE_OP(op_post_dec)
 423         DEFINE_SLOWCASE_OP(op_post_inc)
 424         DEFINE_SLOWCASE_OP(op_pre_dec)
 425         DEFINE_SLOWCASE_OP(op_pre_inc)
 426         DEFINE_SLOWCASE_OP(op_put_by_id)
 427         DEFINE_SLOWCASE_OP(op_put_by_val)
 428         DEFINE_SLOWCASE_OP(op_resolve_global)
 429         DEFINE_SLOWCASE_OP(op_resolve_global_dynamic)
 430         DEFINE_SLOWCASE_OP(op_rshift)
 431         DEFINE_SLOWCASE_OP(op_urshift)
 432         DEFINE_SLOWCASE_OP(op_stricteq)
 433         DEFINE_SLOWCASE_OP(op_sub)
 434         DEFINE_SLOWCASE_OP(op_to_jsnumber)
 435         DEFINE_SLOWCASE_OP(op_to_primitive)
 436         default:
 437             ASSERT_NOT_REACHED();
 438         }
 439
 440         ASSERT_WITH_MESSAGE(iter == m_slowCases.end() || firstTo != iter->to,"Not enough jumps linked in slow case codegen.");
 441         ASSERT_WITH_MESSAGE(firstTo == (iter - 1)->to, "Too many jumps linked in slow case codegen.");
 442
 443         emitJumpSlowToHot(jump(), 0);
 444     }
 445
 446 #if ENABLE(JIT_OPTIMIZE_PROPERTY_ACCESS)
 447     ASSERT(m_propertyAccessInstructionIndex == m_codeBlock->numberOfStructureStubInfos());
 448 #endif
 449     ASSERT(m_callLinkInfoIndex == m_codeBlock->numberOfCallLinkInfos());
 450
 451 #ifndef NDEBUG
 452     // Reset this, in order to guard its use with ASSERTs.
 453     m_bytecodeIndex = (unsigned)-1;
 454 #endif
 455 }
 456
 457 JITCode JIT::privateCompile()
 458 {
 459     sampleCodeBlock(m_codeBlock);
 460 #if ENABLE(OPCODE_SAMPLING)
 461     sampleInstruction(m_codeBlock->instructions().begin());
 462 #endif
 463
 464     // Could use a pop_m, but would need to offset the following instruction if so.
 465     preserveReturnAddressAfterCall(regT2);
 466     emitPutToCallFrameHeader(regT2, RegisterFile::ReturnPC);
 467
 468     Jump slowRegisterFileCheck;
 469     Label afterRegisterFileCheck;
 470     if (m_codeBlock->codeType() == FunctionCode) {
 471         // In the case of a fast linked call, we do not set this up in the caller.
 472         emitPutImmediateToCallFrameHeader(m_codeBlock, RegisterFile::CodeBlock);
 473
 474         peek(regT0, OBJECT_OFFSETOF(JITStackFrame, registerFile) / sizeof (void*));
 475         addPtr(Imm32(m_codeBlock->m_numCalleeRegisters * sizeof(Register)), callFrameRegister, regT1);
 476
 477         slowRegisterFileCheck = branchPtr(Above, regT1, Address(regT0, OBJECT_OFFSETOF(RegisterFile, m_end)));
 478         afterRegisterFileCheck = label();
 479     }
 480
 481     privateCompileMainPass();
 482     privateCompileLinkPass();
 483     privateCompileSlowCases();
 484
 485     if (m_codeBlock->codeType() == FunctionCode) {
 486         slowRegisterFileCheck.link(this);
 487         m_bytecodeIndex = 0;
 488         JITStubCall(this, cti_register_file_check).call();
 489 #ifndef NDEBUG
 490         m_bytecodeIndex = (unsigned)-1; // Reset this, in order to guard its use with ASSERTs.
 491 #endif
 492         jump(afterRegisterFileCheck);
 493     }
 494
 495     ASSERT(m_jmpTable.isEmpty());
 496
 497     LinkBuffer patchBuffer(this, m_globalData->executableAllocator.poolForSize(m_assembler.size()));
 498
 499     // Translate vPC offsets into addresses in JIT generated code, for switch tables.
 500     for (unsigned i = 0; i < m_switches.size(); ++i) {
 501         SwitchRecord record = m_switches[i];
 502         unsigned bytecodeIndex = record.bytecodeIndex;
 503
 504         if (record.type != SwitchRecord::String) {
 505             ASSERT(record.type == SwitchRecord::Immediate || record.type == SwitchRecord::Character);
 506             ASSERT(record.jumpTable.simpleJumpTable->branchOffsets.size() == record.jumpTable.simpleJumpTable->ctiOffsets.size());
 507
 508             record.jumpTable.simpleJumpTable->ctiDefault = patchBuffer.locationOf(m_labels[bytecodeIndex + record.defaultOffset]);
 509
 510             for (unsigned j = 0; j < record.jumpTable.simpleJumpTable->branchOffsets.size(); ++j) {
 511                 unsigned offset = record.jumpTable.simpleJumpTable->branchOffsets[j];
 512                 record.jumpTable.simpleJumpTable->ctiOffsets[j] = offset ? patchBuffer.locationOf(m_labels[bytecodeIndex + offset]) : record.jumpTable.simpleJumpTable->ctiDefault;
 513             }
 514         } else {
 515             ASSERT(record.type == SwitchRecord::String);
 516
 517             record.jumpTable.stringJumpTable->ctiDefault = patchBuffer.locationOf(m_labels[bytecodeIndex + record.defaultOffset]);
 518
 519             StringJumpTable::StringOffsetTable::iterator end = record.jumpTable.stringJumpTable->offsetTable.end();
 520             for (StringJumpTable::StringOffsetTable::iterator it = record.jumpTable.stringJumpTable->offsetTable.begin(); it != end; ++it) {
 521                 unsigned offset = it->second.branchOffset;
 522                 it->second.ctiOffset = offset ? patchBuffer.locationOf(m_labels[bytecodeIndex + offset]) : record.jumpTable.stringJumpTable->ctiDefault;
 523             }
 524         }
 525     }
 526
 527     for (size_t i = 0; i < m_codeBlock->numberOfExceptionHandlers(); ++i) {
 528         HandlerInfo& handler = m_codeBlock->exceptionHandler(i);
 529         handler.nativeCode = patchBuffer.locationOf(m_labels[handler.target]);
 530     }
 531
 532     for (Vector<CallRecord>::iterator iter = m_calls.begin(); iter != m_calls.end(); ++iter) {
 533         if (iter->to)
 534             patchBuffer.link(iter->from, FunctionPtr(iter->to));
 535     }
 536
 537     if (m_codeBlock->hasExceptionInfo()) {
 538         m_codeBlock->callReturnIndexVector().reserveCapacity(m_calls.size());
 539         for (Vector<CallRecord>::iterator iter = m_calls.begin(); iter != m_calls.end(); ++iter)
 540             m_codeBlock->callReturnIndexVector().append(CallReturnOffsetToBytecodeIndex(patchBuffer.returnAddressOffset(iter->from), iter->bytecodeIndex));
 541     }
 542
 543     // Link absolute addresses for jsr
 544     for (Vector<JSRInfo>::iterator iter = m_jsrSites.begin(); iter != m_jsrSites.end(); ++iter)
 545         patchBuffer.patch(iter->storeLocation, patchBuffer.locationOf(iter->target).executableAddress());
 546
 547 #if ENABLE(JIT_OPTIMIZE_PROPERTY_ACCESS)
 548     for (unsigned i = 0; i < m_codeBlock->numberOfStructureStubInfos(); ++i) {
 549         StructureStubInfo& info = m_codeBlock->structureStubInfo(i);
 550         info.callReturnLocation = patchBuffer.locationOf(m_propertyAccessCompilationInfo[i].callReturnLocation);
 551         info.hotPathBegin = patchBuffer.locationOf(m_propertyAccessCompilationInfo[i].hotPathBegin);
 552     }
 553 #endif
 554 #if ENABLE(JIT_OPTIMIZE_CALL)
 555     for (unsigned i = 0; i < m_codeBlock->numberOfCallLinkInfos(); ++i) {
 556         CallLinkInfo& info = m_codeBlock->callLinkInfo(i);
 557         info.ownerCodeBlock = m_codeBlock;
 558         info.callReturnLocation = patchBuffer.locationOfNearCall(m_callStructureStubCompilationInfo[i].callReturnLocation);
 559         info.hotPathBegin = patchBuffer.locationOf(m_callStructureStubCompilationInfo[i].hotPathBegin);
 560         info.hotPathOther = patchBuffer.locationOfNearCall(m_callStructureStubCompilationInfo[i].hotPathOther);
 561     }
 562 #endif
 563     unsigned methodCallCount = m_methodCallCompilationInfo.size();
 564     m_codeBlock->addMethodCallLinkInfos(methodCallCount);
 565     for (unsigned i = 0; i < methodCallCount; ++i) {
 566         MethodCallLinkInfo& info = m_codeBlock->methodCallLinkInfo(i);
 567         info.structureLabel = patchBuffer.locationOf(m_methodCallCompilationInfo[i].structureToCompare);
 568         info.callReturnLocation = m_codeBlock->structureStubInfo(m_methodCallCompilationInfo[i].propertyAccessIndex).callReturnLocation;
 569     }
 570
 571     return patchBuffer.finalizeCode();
 572 }
 573
 574 #if !USE(JSVALUE32_64)
 575 void JIT::emitGetVariableObjectRegister(RegisterID variableObject, int index, RegisterID dst)
 576 {
 577     loadPtr(Address(variableObject, OBJECT_OFFSETOF(JSVariableObject, d)), dst);
 578     loadPtr(Address(dst, OBJECT_OFFSETOF(JSVariableObject::JSVariableObjectData, registers)), dst);
 579     loadPtr(Address(dst, index * sizeof(Register)), dst);
 580 }
 581
 582 void JIT::emitPutVariableObjectRegister(RegisterID src, RegisterID variableObject, int index)
 583 {
 584     loadPtr(Address(variableObject, OBJECT_OFFSETOF(JSVariableObject, d)), variableObject);
 585     loadPtr(Address(variableObject, OBJECT_OFFSETOF(JSVariableObject::JSVariableObjectData, registers)), variableObject);
 586     storePtr(src, Address(variableObject, index * sizeof(Register)));
 587 }
 588 #endif
 589
 590 #if ENABLE(JIT_OPTIMIZE_CALL)
 591 void JIT::unlinkCall(CallLinkInfo* callLinkInfo)
 592 {
 593     // When the JSFunction is deleted the pointer embedded in the instruction stream will no longer be valid
 594     // (and, if a new JSFunction happened to be constructed at the same location, we could get a false positive
 595     // match).  Reset the check so it no longer matches.
 596     RepatchBuffer repatchBuffer(callLinkInfo->ownerCodeBlock);
 597 #if USE(JSVALUE32_64)
 598     repatchBuffer.repatch(callLinkInfo->hotPathBegin, 0);
 599 #else
 600     repatchBuffer.repatch(callLinkInfo->hotPathBegin, JSValue::encode(JSValue()));
 601 #endif
 602 }
 603
 604 void JIT::linkCall(JSFunction* callee, CodeBlock* callerCodeBlock, CodeBlock* calleeCodeBlock, JITCode& code, CallLinkInfo* callLinkInfo, int callerArgCount, JSGlobalData* globalData)
 605 {
 606     RepatchBuffer repatchBuffer(callerCodeBlock);
 607
 608     // Currently we only link calls with the exact number of arguments.
 609     // If this is a native call calleeCodeBlock is null so the number of parameters is unimportant
 610     if (!calleeCodeBlock || (callerArgCount == calleeCodeBlock->m_numParameters)) {
 611         ASSERT(!callLinkInfo->isLinked());
 612
 613         if (calleeCodeBlock)
 614             calleeCodeBlock->addCaller(callLinkInfo);
 615
 616         repatchBuffer.repatch(callLinkInfo->hotPathBegin, callee);
 617         repatchBuffer.relink(callLinkInfo->hotPathOther, code.addressForCall());
 618     }
 619
 620     // patch the call so we do not continue to try to link.
 621     repatchBuffer.relink(callLinkInfo->callReturnLocation, globalData->jitStubs->ctiVirtualCall());
 622 }
 623 #endif // ENABLE(JIT_OPTIMIZE_CALL)
 624
 625 } // namespace JSC
 626
 627 #endif // ENABLE(JIT)