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