Source/JavaScriptCore/jit/JITCall.cpp

   1 /*
   2  * Copyright (C) 2008 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 "JITInlineMethods.h"
  35 #include "JITStubCall.h"
  36 #include "JSArray.h"
  37 #include "JSFunction.h"
  38 #include "Interpreter.h"
  39 #include "ResultType.h"
  40 #include "SamplingTool.h"
  41
  42 #ifndef NDEBUG
  43 #include <stdio.h>
  44 #endif
  45
  46 using namespace std;
  47
  48 namespace JSC {
  49
  50 void JIT::emit_op_call_put_result(Instruction* instruction)
  51 {
  52     int dst = instruction[1].u.operand;
  53     emitValueProfilingSite(FirstProfilingSite);
  54     emitPutVirtualRegister(dst);
  55 }
  56
  57 void JIT::compileLoadVarargs(Instruction* instruction)
  58 {
  59     int thisValue = instruction[2].u.operand;
  60     int arguments = instruction[3].u.operand;
  61     int firstFreeRegister = instruction[4].u.operand;
  62
  63     killLastResultRegister();
  64
  65     JumpList slowCase;
  66     JumpList end;
  67     if (m_codeBlock->usesArguments() && arguments == m_codeBlock->argumentsRegister()) {
  68         emitGetVirtualRegister(arguments, regT0);
  69         slowCase.append(branchPtr(NotEqual, regT0, TrustedImmPtr(JSValue::encode(JSValue()))));
  70
  71         emitGetFromCallFrameHeader32(RegisterFile::ArgumentCount, regT0);
  72         slowCase.append(branch32(Above, regT0, TrustedImm32(Arguments::MaxArguments + 1)));
  73         // regT0: argumentCountIncludingThis
  74
  75         move(regT0, regT1);
  76         add32(TrustedImm32(firstFreeRegister + RegisterFile::CallFrameHeaderSize), regT1);
  77         lshift32(TrustedImm32(3), regT1);
  78         addPtr(callFrameRegister, regT1);
  79         // regT1: newCallFrame
  80
  81         slowCase.append(branchPtr(Below, AbsoluteAddress(m_globalData->interpreter->registerFile().addressOfEnd()), regT1));
  82
  83         // Initialize ArgumentCount.
  84         emitFastArithReTagImmediate(regT0, regT2);
  85         storePtr(regT2, Address(regT1, RegisterFile::ArgumentCount * static_cast<int>(sizeof(Register))));
  86
  87         // Initialize 'this'.
  88         emitGetVirtualRegister(thisValue, regT2);
  89         storePtr(regT2, Address(regT1, CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register))));
  90
  91         // Copy arguments.
  92         neg32(regT0);
  93         signExtend32ToPtr(regT0, regT0);
  94         end.append(branchAddPtr(Zero, Imm32(1), regT0));
  95         // regT0: -argumentCount
  96
  97         Label copyLoop = label();
  98         loadPtr(BaseIndex(callFrameRegister, regT0, TimesEight, CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register))), regT2);
  99         storePtr(regT2, BaseIndex(regT1, regT0, TimesEight, CallFrame::thisArgumentOffset() * static_cast<int>(sizeof(Register))));
 100         branchAddPtr(NonZero, Imm32(1), regT0).linkTo(copyLoop, this);
 101
 102         end.append(jump());
 103     }
 104
 105     if (m_codeBlock->usesArguments() && arguments == m_codeBlock->argumentsRegister())
 106         slowCase.link(this);
 107
 108     JITStubCall stubCall(this, cti_op_load_varargs);
 109     stubCall.addArgument(thisValue, regT0);
 110     stubCall.addArgument(arguments, regT0);
 111     stubCall.addArgument(Imm32(firstFreeRegister));
 112     stubCall.call(regT1);
 113
 114     if (m_codeBlock->usesArguments() && arguments == m_codeBlock->argumentsRegister())
 115         end.link(this);
 116 }
 117
 118 void JIT::compileCallEval()
 119 {
 120     JITStubCall stubCall(this, cti_op_call_eval); // Initializes ScopeChain; ReturnPC; CodeBlock.
 121     stubCall.call();
 122     addSlowCase(branchPtr(Equal, regT0, TrustedImmPtr(JSValue::encode(JSValue()))));
 123     emitGetFromCallFrameHeaderPtr(RegisterFile::CallerFrame, callFrameRegister);
 124
 125     sampleCodeBlock(m_codeBlock);
 126 }
 127
 128 void JIT::compileCallEvalSlowCase(Vector<SlowCaseEntry>::iterator& iter)
 129 {
 130     linkSlowCase(iter);
 131
 132     emitGetFromCallFrameHeaderPtr(RegisterFile::Callee, regT0);
 133     emitNakedCall(m_globalData->jitStubs->ctiVirtualCall());
 134
 135     sampleCodeBlock(m_codeBlock);
 136 }
 137
 138 void JIT::compileOpCall(OpcodeID opcodeID, Instruction* instruction, unsigned callLinkInfoIndex)
 139 {
 140     int callee = instruction[1].u.operand;
 141
 142     /* Caller always:
 143         - Updates callFrameRegister to callee callFrame.
 144         - Initializes ArgumentCount; CallerFrame; Callee.
 145
 146        For a JS call:
 147         - Caller initializes ScopeChain.
 148         - Callee initializes ReturnPC; CodeBlock.
 149         - Callee restores callFrameRegister before return.
 150
 151        For a non-JS call:
 152         - Caller initializes ScopeChain; ReturnPC; CodeBlock.
 153         - Caller restores callFrameRegister after return.
 154     */
 155
 156     if (opcodeID == op_call_varargs)
 157         compileLoadVarargs(instruction);
 158     else {
 159         int argCount = instruction[2].u.operand;
 160         int registerOffset = instruction[3].u.operand;
 161
 162         addPtr(TrustedImm32(registerOffset * sizeof(Register)), callFrameRegister, regT1);
 163         store32(TrustedImm32(argCount), Address(regT1, RegisterFile::ArgumentCount * static_cast<int>(sizeof(Register))));
 164     } // regT1 holds newCallFrame with ArgumentCount initialized.
 165     emitGetVirtualRegister(callee, regT0); // regT0 holds callee.
 166
 167     storePtr(callFrameRegister, Address(regT1, RegisterFile::CallerFrame * static_cast<int>(sizeof(Register))));
 168     storePtr(regT0, Address(regT1, RegisterFile::Callee * static_cast<int>(sizeof(Register))));
 169     move(regT1, callFrameRegister);
 170
 171     if (opcodeID == op_call_eval) {
 172         compileCallEval();
 173         return;
 174     }
 175
 176     DataLabelPtr addressOfLinkedFunctionCheck;
 177     BEGIN_UNINTERRUPTED_SEQUENCE(sequenceOpCall);
 178     Jump slowCase = branchPtrWithPatch(NotEqual, regT0, addressOfLinkedFunctionCheck, TrustedImmPtr(JSValue::encode(JSValue())));
 179     END_UNINTERRUPTED_SEQUENCE(sequenceOpCall);
 180     addSlowCase(slowCase);
 181
 182     ASSERT_JIT_OFFSET(differenceBetween(addressOfLinkedFunctionCheck, slowCase), patchOffsetOpCallCompareToJump);
 183     ASSERT(m_callStructureStubCompilationInfo.size() == callLinkInfoIndex);
 184     m_callStructureStubCompilationInfo.append(StructureStubCompilationInfo());
 185     m_callStructureStubCompilationInfo[callLinkInfoIndex].hotPathBegin = addressOfLinkedFunctionCheck;
 186     m_callStructureStubCompilationInfo[callLinkInfoIndex].callType = CallLinkInfo::callTypeFor(opcodeID);
 187     m_callStructureStubCompilationInfo[callLinkInfoIndex].bytecodeIndex = m_bytecodeOffset;
 188
 189     loadPtr(Address(regT0, OBJECT_OFFSETOF(JSFunction, m_scopeChain)), regT1);
 190     emitPutToCallFrameHeader(regT1, RegisterFile::ScopeChain);
 191     m_callStructureStubCompilationInfo[callLinkInfoIndex].hotPathOther = emitNakedCall();
 192
 193     sampleCodeBlock(m_codeBlock);
 194 }
 195
 196 void JIT::compileOpCallSlowCase(OpcodeID opcodeID, Instruction*, Vector<SlowCaseEntry>::iterator& iter, unsigned callLinkInfoIndex)
 197 {
 198     if (opcodeID == op_call_eval) {
 199         compileCallEvalSlowCase(iter);
 200         return;
 201     }
 202
 203     linkSlowCase(iter);
 204
 205     m_callStructureStubCompilationInfo[callLinkInfoIndex].callReturnLocation = emitNakedCall(opcodeID == op_construct ? m_globalData->jitStubs->ctiVirtualConstructLink() : m_globalData->jitStubs->ctiVirtualCallLink());
 206
 207     sampleCodeBlock(m_codeBlock);
 208 }
 209
 210 } // namespace JSC
 211
 212 #endif // USE(JSVALUE64)
 213 #endif // ENABLE(JIT)