jit/JITCall32_64.cpp

   1 /*
   2  * Copyright (C) 2008, 2013 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
  28 #if ENABLE(JIT)
  29 #if USE(JSVALUE32_64)
  30 #include "JIT.h"
  31
  32 #include "Arguments.h"
  33 #include "CodeBlock.h"
  34 #include "Interpreter.h"
  35 #include "JITInlines.h"
  36 #include "JITStubCall.h"
  37 #include "JSArray.h"
  38 #include "JSFunction.h"
  39 #include "Operations.h"
  40 #include "RepatchBuffer.h"
  41 #include "ResultType.h"
  42 #include "SamplingTool.h"
  43 #include <wtf/StringPrintStream.h>
  44
  45 #ifndef NDEBUG
  46 #include <stdio.h>
  47 #endif
  48
  49 using namespace std;
  50
  51 namespace JSC {
  52
  53 void JIT::emit_op_call_put_result(Instruction* instruction)
  54 {
  55     int dst = instruction[1].u.operand;
  56     emitValueProfilingSite();
  57     emitStore(dst, regT1, regT0);
  58 }
  59
  60 void JIT::emit_op_ret(Instruction* currentInstruction)
  61 {
  62     unsigned dst = currentInstruction[1].u.operand;
  63
  64     emitLoad(dst, regT1, regT0);
  65     emitGetFromCallFrameHeaderPtr(JSStack::ReturnPC, regT2);
  66     emitGetFromCallFrameHeaderPtr(JSStack::CallerFrame, callFrameRegister);
  67
  68     restoreReturnAddressBeforeReturn(regT2);
  69     ret();
  70 }
  71
  72 void JIT::emit_op_ret_object_or_this(Instruction* currentInstruction)
  73 {
  74     unsigned result = currentInstruction[1].u.operand;
  75     unsigned thisReg = currentInstruction[2].u.operand;
  76
  77     emitLoad(result, regT1, regT0);
  78     Jump notJSCell = branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag));
  79     loadPtr(Address(regT0, JSCell::structureOffset()), regT2);
  80     Jump notObject = emitJumpIfNotObject(regT2);
  81
  82     emitGetFromCallFrameHeaderPtr(JSStack::ReturnPC, regT2);
  83     emitGetFromCallFrameHeaderPtr(JSStack::CallerFrame, callFrameRegister);
  84
  85     restoreReturnAddressBeforeReturn(regT2);
  86     ret();
  87
  88     notJSCell.link(this);
  89     notObject.link(this);
  90     emitLoad(thisReg, regT1, regT0);
  91
  92     emitGetFromCallFrameHeaderPtr(JSStack::ReturnPC, regT2);
  93     emitGetFromCallFrameHeaderPtr(JSStack::CallerFrame, callFrameRegister);
  94
  95     restoreReturnAddressBeforeReturn(regT2);
  96     ret();
  97 }
  98
  99 void JIT::emitSlow_op_call(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
 100 {
 101     compileOpCallSlowCase(op_call, currentInstruction, iter, m_callLinkInfoIndex++);
 102 }
 103
 104 void JIT::emitSlow_op_call_eval(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
 105 {
 106     compileOpCallSlowCase(op_call_eval, currentInstruction, iter, m_callLinkInfoIndex);
 107 }
 108
 109 void JIT::emitSlow_op_call_varargs(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
 110 {
 111     compileOpCallSlowCase(op_call_varargs, currentInstruction, iter, m_callLinkInfoIndex++);
 112 }
 113
 114 void JIT::emitSlow_op_construct(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
 115 {
 116     compileOpCallSlowCase(op_construct, currentInstruction, iter, m_callLinkInfoIndex++);
 117 }
 118
 119 void JIT::emit_op_call(Instruction* currentInstruction)
 120 {
 121     compileOpCall(op_call, currentInstruction, m_callLinkInfoIndex++);
 122 }
 123
 124 void JIT::emit_op_call_eval(Instruction* currentInstruction)
 125 {
 126     compileOpCall(op_call_eval, currentInstruction, m_callLinkInfoIndex);
 127 }
 128
 129 void JIT::emit_op_call_varargs(Instruction* currentInstruction)
 130 {
 131     compileOpCall(op_call_varargs, currentInstruction, m_callLinkInfoIndex++);
 132 }
 133
 134 void JIT::emit_op_construct(Instruction* currentInstruction)
 135 {
 136     compileOpCall(op_construct, currentInstruction, m_callLinkInfoIndex++);
 137 }
 138
 139 void JIT::compileLoadVarargs(Instruction* instruction)
 140 {
 141     int thisValue = instruction[2].u.operand;
 142     int arguments = instruction[3].u.operand;
 143     int firstFreeRegister = instruction[4].u.operand;
 144
 145     JumpList slowCase;
 146     JumpList end;
 147     bool canOptimize = m_codeBlock->usesArguments()
 148         && arguments == m_codeBlock->argumentsRegister()
 149         && !m_codeBlock->symbolTable()->slowArguments();
 150
 151     if (canOptimize) {
 152         emitLoadTag(arguments, regT1);
 153         slowCase.append(branch32(NotEqual, regT1, TrustedImm32(JSValue::EmptyValueTag)));
 154
 155         load32(payloadFor(JSStack::ArgumentCount), regT2);
 156         slowCase.append(branch32(Above, regT2, TrustedImm32(Arguments::MaxArguments + 1)));
 157         // regT2: argumentCountIncludingThis
 158
 159         move(regT2, regT3);
 160         add32(TrustedImm32(firstFreeRegister + JSStack::CallFrameHeaderSize), regT3);
 161         lshift32(TrustedImm32(3), regT3);
 162         addPtr(callFrameRegister, regT3);
 163         // regT3: newCallFrame
 164
 165         slowCase.append(branchPtr(Below, AbsoluteAddress(m_vm->interpreter->stack().addressOfEnd()), regT3));
 166
 167         // Initialize ArgumentCount.
 168         store32(regT2, payloadFor(JSStack::ArgumentCount, regT3));
 169
 170         // Initialize 'this'.
 171         emitLoad(thisValue, regT1, regT0);
 172         store32(regT0, Address(regT3, OBJECT_OFFSETOF(JSValue, u.asBits.payload) + (CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))));
 173         store32(regT1, Address(regT3, OBJECT_OFFSETOF(JSValue, u.asBits.tag) + (CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))));
 174
 175         // Copy arguments.
 176         neg32(regT2);
 177         end.append(branchAdd32(Zero, TrustedImm32(1), regT2));
 178         // regT2: -argumentCount;
 179
 180         Label copyLoop = label();
 181         load32(BaseIndex(callFrameRegister, regT2, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.payload) +(CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))), regT0);
 182         load32(BaseIndex(callFrameRegister, regT2, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.tag) +(CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))), regT1);
 183         store32(regT0, BaseIndex(regT3, regT2, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.payload) +(CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))));
 184         store32(regT1, BaseIndex(regT3, regT2, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.tag) +(CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register)))));
 185         branchAdd32(NonZero, TrustedImm32(1), regT2).linkTo(copyLoop, this);
 186
 187         end.append(jump());
 188     }
 189
 190     if (canOptimize)
 191         slowCase.link(this);
 192
 193     JITStubCall stubCall(this, cti_op_load_varargs);
 194     stubCall.addArgument(thisValue);
 195     stubCall.addArgument(arguments);
 196     stubCall.addArgument(Imm32(firstFreeRegister));
 197     stubCall.call(regT3);
 198
 199     if (canOptimize)
 200         end.link(this);
 201 }
 202
 203 void JIT::compileCallEval()
 204 {
 205     JITStubCall stubCall(this, cti_op_call_eval); // Initializes ScopeChain; ReturnPC; CodeBlock.
 206     stubCall.call();
 207     addSlowCase(branch32(Equal, regT1, TrustedImm32(JSValue::EmptyValueTag)));
 208     emitGetFromCallFrameHeaderPtr(JSStack::CallerFrame, callFrameRegister);
 209
 210     sampleCodeBlock(m_codeBlock);
 211 }
 212
 213 void JIT::compileCallEvalSlowCase(Vector<SlowCaseEntry>::iterator& iter)
 214 {
 215     linkSlowCase(iter);
 216
 217     emitLoad(JSStack::Callee, regT1, regT0);
 218     emitNakedCall(m_vm->getCTIStub(virtualCallGenerator).code());
 219
 220     sampleCodeBlock(m_codeBlock);
 221 }
 222
 223 void JIT::compileOpCall(OpcodeID opcodeID, Instruction* instruction, unsigned callLinkInfoIndex)
 224 {
 225     int callee = instruction[1].u.operand;
 226
 227     /* Caller always:
 228         - Updates callFrameRegister to callee callFrame.
 229         - Initializes ArgumentCount; CallerFrame; Callee.
 230
 231        For a JS call:
 232         - Caller initializes ScopeChain.
 233         - Callee initializes ReturnPC; CodeBlock.
 234         - Callee restores callFrameRegister before return.
 235
 236        For a non-JS call:
 237         - Caller initializes ScopeChain; ReturnPC; CodeBlock.
 238         - Caller restores callFrameRegister after return.
 239     */
 240
 241     if (opcodeID == op_call_varargs)
 242         compileLoadVarargs(instruction);
 243     else {
 244         int argCount = instruction[2].u.operand;
 245         int registerOffset = instruction[3].u.operand;
 246
 247         if (opcodeID == op_call && shouldEmitProfiling()) {
 248             emitLoad(registerOffset + CallFrame::argumentOffsetIncludingThis(0), regT0, regT1);
 249             Jump done = branch32(NotEqual, regT0, TrustedImm32(JSValue::CellTag));
 250             loadPtr(Address(regT1, JSCell::structureOffset()), regT1);
 251             storePtr(regT1, instruction[5].u.arrayProfile->addressOfLastSeenStructure());
 252             done.link(this);
 253         }
 254
 255         addPtr(TrustedImm32(registerOffset * sizeof(Register)), callFrameRegister, regT3);
 256
 257         store32(TrustedImm32(argCount), payloadFor(JSStack::ArgumentCount, regT3));
 258     } // regT3 holds newCallFrame with ArgumentCount initialized.
 259
 260     storePtr(TrustedImmPtr(instruction), tagFor(JSStack::ArgumentCount, callFrameRegister));
 261     emitLoad(callee, regT1, regT0); // regT1, regT0 holds callee.
 262
 263     storePtr(callFrameRegister, Address(regT3, JSStack::CallerFrame * static_cast<int>(sizeof(Register))));
 264     emitStore(JSStack::Callee, regT1, regT0, regT3);
 265     move(regT3, callFrameRegister);
 266
 267     if (opcodeID == op_call_eval) {
 268         compileCallEval();
 269         return;
 270     }
 271
 272     DataLabelPtr addressOfLinkedFunctionCheck;
 273     BEGIN_UNINTERRUPTED_SEQUENCE(sequenceOpCall);
 274     Jump slowCase = branchPtrWithPatch(NotEqual, regT0, addressOfLinkedFunctionCheck, TrustedImmPtr(0));
 275     END_UNINTERRUPTED_SEQUENCE(sequenceOpCall);
 276
 277     addSlowCase(slowCase);
 278     addSlowCase(branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag)));
 279
 280     ASSERT(m_callStructureStubCompilationInfo.size() == callLinkInfoIndex);
 281     m_callStructureStubCompilationInfo.append(StructureStubCompilationInfo());
 282     m_callStructureStubCompilationInfo[callLinkInfoIndex].hotPathBegin = addressOfLinkedFunctionCheck;
 283     m_callStructureStubCompilationInfo[callLinkInfoIndex].callType = CallLinkInfo::callTypeFor(opcodeID);
 284     m_callStructureStubCompilationInfo[callLinkInfoIndex].bytecodeIndex = m_bytecodeOffset;
 285
 286     loadPtr(Address(regT0, OBJECT_OFFSETOF(JSFunction, m_scope)), regT1);
 287     emitPutCellToCallFrameHeader(regT1, JSStack::ScopeChain);
 288     m_callStructureStubCompilationInfo[callLinkInfoIndex].hotPathOther = emitNakedCall();
 289
 290     sampleCodeBlock(m_codeBlock);
 291 }
 292
 293 void JIT::compileOpCallSlowCase(OpcodeID opcodeID, Instruction*, Vector<SlowCaseEntry>::iterator& iter, unsigned callLinkInfoIndex)
 294 {
 295     if (opcodeID == op_call_eval) {
 296         compileCallEvalSlowCase(iter);
 297         return;
 298     }
 299
 300     linkSlowCase(iter);
 301     linkSlowCase(iter);
 302
 303     m_callStructureStubCompilationInfo[callLinkInfoIndex].callReturnLocation = emitNakedCall(opcodeID == op_construct ? m_vm->getCTIStub(linkConstructGenerator).code() : m_vm->getCTIStub(linkCallGenerator).code());
 304
 305     sampleCodeBlock(m_codeBlock);
 306 }
 307
 308 void JIT::privateCompileClosureCall(CallLinkInfo* callLinkInfo, CodeBlock* calleeCodeBlock, Structure* expectedStructure, ExecutableBase* expectedExecutable, MacroAssemblerCodePtr codePtr)
 309 {
 310     JumpList slowCases;
 311
 312     slowCases.append(branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag)));
 313     slowCases.append(branchPtr(NotEqual, Address(regT0, JSCell::structureOffset()), TrustedImmPtr(expectedStructure)));
 314     slowCases.append(branchPtr(NotEqual, Address(regT0, JSFunction::offsetOfExecutable()), TrustedImmPtr(expectedExecutable)));
 315
 316     loadPtr(Address(regT0, JSFunction::offsetOfScopeChain()), regT1);
 317     emitPutCellToCallFrameHeader(regT1, JSStack::ScopeChain);
 318
 319     Call call = nearCall();
 320     Jump done = jump();
 321
 322     slowCases.link(this);
 323     move(TrustedImmPtr(callLinkInfo->callReturnLocation.executableAddress()), regT2);
 324     restoreReturnAddressBeforeReturn(regT2);
 325     Jump slow = jump();
 326
 327     LinkBuffer patchBuffer(*m_vm, this, m_codeBlock);
 328
 329     patchBuffer.link(call, FunctionPtr(codePtr.executableAddress()));
 330     patchBuffer.link(done, callLinkInfo->hotPathOther.labelAtOffset(0));
 331     patchBuffer.link(slow, CodeLocationLabel(m_vm->getCTIStub(virtualCallGenerator).code()));
 332
 333     RefPtr<ClosureCallStubRoutine> stubRoutine = adoptRef(new ClosureCallStubRoutine(
 334         FINALIZE_CODE(
 335             patchBuffer,
 336             ("Baseline closure call stub for %s, return point %p, target %p (%s)",
 337                 toCString(*m_codeBlock).data(),
 338                 callLinkInfo->hotPathOther.labelAtOffset(0).executableAddress(),
 339                 codePtr.executableAddress(),
 340                 toCString(pointerDump(calleeCodeBlock)).data())),
 341         *m_vm, m_codeBlock->ownerExecutable(), expectedStructure, expectedExecutable,
 342         callLinkInfo->codeOrigin));
 343
 344     RepatchBuffer repatchBuffer(m_codeBlock);
 345
 346     repatchBuffer.replaceWithJump(
 347         RepatchBuffer::startOfBranchPtrWithPatchOnRegister(callLinkInfo->hotPathBegin),
 348         CodeLocationLabel(stubRoutine->code().code()));
 349     repatchBuffer.relink(callLinkInfo->callReturnLocation, m_vm->getCTIStub(virtualCallGenerator).code());
 350
 351     callLinkInfo->stub = stubRoutine.release();
 352 }
 353
 354 } // namespace JSC
 355
 356 #endif // USE(JSVALUE32_64)
 357 #endif // ENABLE(JIT)