jit/JITCall.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(JSVALUE64)
  30 #include "JIT.h"
  31
  32 #include "Arguments.h"
  33 #include "CodeBlock.h"
  34 #include "JITInlines.h"
  35 #include "JITStubCall.h"
  36 #include "JSArray.h"
  37 #include "JSFunction.h"
  38 #include "Interpreter.h"
  39 #include "Operations.h"
  40 #include "RepatchBuffer.h"
  41 #include "ResultType.h"
  42 #include "SamplingTool.h"
  43 #include "ThunkGenerators.h"
  44 #include <wtf/StringPrintStream.h>
  45
  46 #ifndef NDEBUG
  47 #include <stdio.h>
  48 #endif
  49
  50 using namespace std;
  51
  52 namespace JSC {
  53
  54 void JIT::emit_op_call_put_result(Instruction* instruction)
  55 {
  56     int dst = instruction[1].u.operand;
  57     emitValueProfilingSite();
  58     emitPutVirtualRegister(dst);
  59     if (canBeOptimizedOrInlined())
  60         killLastResultRegister(); // Make lastResultRegister tracking simpler in the DFG.
  61 }
  62
  63 void JIT::compileLoadVarargs(Instruction* instruction)
  64 {
  65     int thisValue = instruction[2].u.operand;
  66     int arguments = instruction[3].u.operand;
  67     int firstFreeRegister = instruction[4].u.operand;
  68
  69     killLastResultRegister();
  70
  71     JumpList slowCase;
  72     JumpList end;
  73     bool canOptimize = m_codeBlock->usesArguments()
  74         && arguments == m_codeBlock->argumentsRegister()
  75         && !m_codeBlock->symbolTable()->slowArguments();
  76
  77     if (canOptimize) {
  78         emitGetVirtualRegister(arguments, regT0);
  79         slowCase.append(branch64(NotEqual, regT0, TrustedImm64(JSValue::encode(JSValue()))));
  80
  81         emitGetFromCallFrameHeader32(JSStack::ArgumentCount, regT0);
  82         slowCase.append(branch32(Above, regT0, TrustedImm32(Arguments::MaxArguments + 1)));
  83         // regT0: argumentCountIncludingThis
  84
  85         move(regT0, regT1);
  86         add32(TrustedImm32(firstFreeRegister + JSStack::CallFrameHeaderSize), regT1);
  87         lshift32(TrustedImm32(3), regT1);
  88         addPtr(callFrameRegister, regT1);
  89         // regT1: newCallFrame
  90
  91         slowCase.append(branchPtr(Below, AbsoluteAddress(m_vm->interpreter->stack().addressOfEnd()), regT1));
  92
  93         // Initialize ArgumentCount.
  94         store32(regT0, Address(regT1, JSStack::ArgumentCount * static_cast<int>(sizeof(Register)) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.payload)));
  95
  96         // Initialize 'this'.
  97         emitGetVirtualRegister(thisValue, regT2);
  98         store64(regT2, Address(regT1, CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register))));
  99
 100         // Copy arguments.
 101         neg32(regT0);
 102         signExtend32ToPtr(regT0, regT0);
 103         end.append(branchAdd64(Zero, TrustedImm32(1), regT0));
 104         // regT0: -argumentCount
 105
 106         Label copyLoop = label();
 107         load64(BaseIndex(callFrameRegister, regT0, TimesEight, CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register))), regT2);
 108         store64(regT2, BaseIndex(regT1, regT0, TimesEight, CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register))));
 109         branchAdd64(NonZero, TrustedImm32(1), regT0).linkTo(copyLoop, this);
 110
 111         end.append(jump());
 112     }
 113
 114     if (canOptimize)
 115         slowCase.link(this);
 116
 117     JITStubCall stubCall(this, cti_op_load_varargs);
 118     stubCall.addArgument(thisValue, regT0);
 119     stubCall.addArgument(arguments, regT0);
 120     stubCall.addArgument(Imm32(firstFreeRegister));
 121     stubCall.call(regT1);
 122
 123     if (canOptimize)
 124         end.link(this);
 125 }
 126
 127 void JIT::compileCallEval()
 128 {
 129     JITStubCall stubCall(this, cti_op_call_eval); // Initializes ScopeChain; ReturnPC; CodeBlock.
 130     stubCall.call();
 131     addSlowCase(branch64(Equal, regT0, TrustedImm64(JSValue::encode(JSValue()))));
 132     emitGetFromCallFrameHeaderPtr(JSStack::CallerFrame, callFrameRegister);
 133
 134     sampleCodeBlock(m_codeBlock);
 135 }
 136
 137 void JIT::compileCallEvalSlowCase(Vector<SlowCaseEntry>::iterator& iter)
 138 {
 139     linkSlowCase(iter);
 140
 141     emitGetFromCallFrameHeader64(JSStack::Callee, regT0);
 142     emitNakedCall(m_vm->getCTIStub(virtualCallGenerator).code());
 143
 144     sampleCodeBlock(m_codeBlock);
 145 }
 146
 147 void JIT::compileOpCall(OpcodeID opcodeID, Instruction* instruction, unsigned callLinkInfoIndex)
 148 {
 149     int callee = instruction[1].u.operand;
 150
 151     /* Caller always:
 152         - Updates callFrameRegister to callee callFrame.
 153         - Initializes ArgumentCount; CallerFrame; Callee.
 154
 155        For a JS call:
 156         - Caller initializes ScopeChain.
 157         - Callee initializes ReturnPC; CodeBlock.
 158         - Callee restores callFrameRegister before return.
 159
 160        For a non-JS call:
 161         - Caller initializes ScopeChain; ReturnPC; CodeBlock.
 162         - Caller restores callFrameRegister after return.
 163     */
 164
 165     if (opcodeID == op_call_varargs)
 166         compileLoadVarargs(instruction);
 167     else {
 168         int argCount = instruction[2].u.operand;
 169         int registerOffset = instruction[3].u.operand;
 170
 171         if (opcodeID == op_call && shouldEmitProfiling()) {
 172             emitGetVirtualRegister(registerOffset + CallFrame::argumentOffsetIncludingThis(0), regT0);
 173             Jump done = emitJumpIfNotJSCell(regT0);
 174             loadPtr(Address(regT0, JSCell::structureOffset()), regT0);
 175             storePtr(regT0, instruction[5].u.arrayProfile->addressOfLastSeenStructure());
 176             done.link(this);
 177         }
 178
 179         addPtr(TrustedImm32(registerOffset * sizeof(Register)), callFrameRegister, regT1);
 180         store32(TrustedImm32(argCount), Address(regT1, JSStack::ArgumentCount * static_cast<int>(sizeof(Register)) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.payload)));
 181     } // regT1 holds newCallFrame with ArgumentCount initialized.
 182
 183     store32(TrustedImm32(instruction - m_codeBlock->instructions().begin()), Address(callFrameRegister, JSStack::ArgumentCount * static_cast<int>(sizeof(Register)) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.tag)));
 184     emitGetVirtualRegister(callee, regT0); // regT0 holds callee.
 185
 186     store64(callFrameRegister, Address(regT1, JSStack::CallerFrame * static_cast<int>(sizeof(Register))));
 187     store64(regT0, Address(regT1, JSStack::Callee * static_cast<int>(sizeof(Register))));
 188     move(regT1, callFrameRegister);
 189
 190     if (opcodeID == op_call_eval) {
 191         compileCallEval();
 192         return;
 193     }
 194
 195     DataLabelPtr addressOfLinkedFunctionCheck;
 196     BEGIN_UNINTERRUPTED_SEQUENCE(sequenceOpCall);
 197     Jump slowCase = branchPtrWithPatch(NotEqual, regT0, addressOfLinkedFunctionCheck, TrustedImmPtr(0));
 198     END_UNINTERRUPTED_SEQUENCE(sequenceOpCall);
 199     addSlowCase(slowCase);
 200
 201     ASSERT(m_callStructureStubCompilationInfo.size() == callLinkInfoIndex);
 202     m_callStructureStubCompilationInfo.append(StructureStubCompilationInfo());
 203     m_callStructureStubCompilationInfo[callLinkInfoIndex].hotPathBegin = addressOfLinkedFunctionCheck;
 204     m_callStructureStubCompilationInfo[callLinkInfoIndex].callType = CallLinkInfo::callTypeFor(opcodeID);
 205     m_callStructureStubCompilationInfo[callLinkInfoIndex].bytecodeIndex = m_bytecodeOffset;
 206
 207     loadPtr(Address(regT0, OBJECT_OFFSETOF(JSFunction, m_scope)), regT1);
 208     emitPutToCallFrameHeader(regT1, JSStack::ScopeChain);
 209     m_callStructureStubCompilationInfo[callLinkInfoIndex].hotPathOther = emitNakedCall();
 210
 211     sampleCodeBlock(m_codeBlock);
 212 }
 213
 214 void JIT::compileOpCallSlowCase(OpcodeID opcodeID, Instruction*, Vector<SlowCaseEntry>::iterator& iter, unsigned callLinkInfoIndex)
 215 {
 216     if (opcodeID == op_call_eval) {
 217         compileCallEvalSlowCase(iter);
 218         return;
 219     }
 220
 221     linkSlowCase(iter);
 222
 223     m_callStructureStubCompilationInfo[callLinkInfoIndex].callReturnLocation = emitNakedCall(opcodeID == op_construct ? m_vm->getCTIStub(linkConstructGenerator).code() : m_vm->getCTIStub(linkCallGenerator).code());
 224
 225     sampleCodeBlock(m_codeBlock);
 226 }
 227
 228 void JIT::privateCompileClosureCall(CallLinkInfo* callLinkInfo, CodeBlock* calleeCodeBlock, Structure* expectedStructure, ExecutableBase* expectedExecutable, MacroAssemblerCodePtr codePtr)
 229 {
 230     JumpList slowCases;
 231
 232     slowCases.append(branchTestPtr(NonZero, regT0, tagMaskRegister));
 233     slowCases.append(branchPtr(NotEqual, Address(regT0, JSCell::structureOffset()), TrustedImmPtr(expectedStructure)));
 234     slowCases.append(branchPtr(NotEqual, Address(regT0, JSFunction::offsetOfExecutable()), TrustedImmPtr(expectedExecutable)));
 235
 236     loadPtr(Address(regT0, JSFunction::offsetOfScopeChain()), regT1);
 237     emitPutToCallFrameHeader(regT1, JSStack::ScopeChain);
 238
 239     Call call = nearCall();
 240     Jump done = jump();
 241
 242     slowCases.link(this);
 243     move(TrustedImmPtr(callLinkInfo->callReturnLocation.executableAddress()), regT2);
 244     restoreReturnAddressBeforeReturn(regT2);
 245     Jump slow = jump();
 246
 247     LinkBuffer patchBuffer(*m_vm, this, m_codeBlock);
 248
 249     patchBuffer.link(call, FunctionPtr(codePtr.executableAddress()));
 250     patchBuffer.link(done, callLinkInfo->hotPathOther.labelAtOffset(0));
 251     patchBuffer.link(slow, CodeLocationLabel(m_vm->getCTIStub(virtualCallGenerator).code()));
 252
 253     RefPtr<ClosureCallStubRoutine> stubRoutine = adoptRef(new ClosureCallStubRoutine(
 254         FINALIZE_CODE(
 255             patchBuffer,
 256             ("Baseline closure call stub for %s, return point %p, target %p (%s)",
 257                 toCString(*m_codeBlock).data(),
 258                 callLinkInfo->hotPathOther.labelAtOffset(0).executableAddress(),
 259                 codePtr.executableAddress(),
 260                 toCString(pointerDump(calleeCodeBlock)).data())),
 261         *m_vm, m_codeBlock->ownerExecutable(), expectedStructure, expectedExecutable,
 262         callLinkInfo->codeOrigin));
 263
 264     RepatchBuffer repatchBuffer(m_codeBlock);
 265
 266     repatchBuffer.replaceWithJump(
 267         RepatchBuffer::startOfBranchPtrWithPatchOnRegister(callLinkInfo->hotPathBegin),
 268         CodeLocationLabel(stubRoutine->code().code()));
 269     repatchBuffer.relink(callLinkInfo->callReturnLocation, m_vm->getCTIStub(virtualCallGenerator).code());
 270
 271     callLinkInfo->stub = stubRoutine.release();
 272 }
 273
 274 } // namespace JSC
 275
 276 #endif // USE(JSVALUE64)
 277 #endif // ENABLE(JIT)