Long live Qt!

1 files changed, 353 insertions, 0 deletions

diff --git a/src/3rdparty/webkit/JavaScriptCore/jit/JITCall.cpp b/src/3rdparty/webkit/JavaScriptCore/jit/JITCall.cpp
new file mode 100644
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+++ b/src/3rdparty/webkit/JavaScriptCore/jit/JITCall.cpp
@@ -0,0 +1,353 @@
+/*
+ * Copyright (C) 2008 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
+ */
+
+#include "config.h"
+#include "JIT.h"
+
+#if ENABLE(JIT)
+
+#include "CodeBlock.h"
+#include "JITInlineMethods.h"
+#include "JSArray.h"
+#include "JSFunction.h"
+#include "Interpreter.h"
+#include "ResultType.h"
+#include "SamplingTool.h"
+
+#ifndef NDEBUG
+#include <stdio.h>
+#endif
+
+using namespace std;
+
+namespace JSC {
+
+void JIT::unlinkCall(CallLinkInfo* callLinkInfo)
+{
+    // When the JSFunction is deleted the pointer embedded in the instruction stream will no longer be valid
+    // (and, if a new JSFunction happened to be constructed at the same location, we could get a false positive
+    // match).  Reset the check so it no longer matches.
+    DataLabelPtr::patch(callLinkInfo->hotPathBegin, JSValuePtr::encode(JSImmediate::impossibleValue()));
+}
+
+void JIT::linkCall(JSFunction* callee, CodeBlock* calleeCodeBlock, void* ctiCode, CallLinkInfo* callLinkInfo, int callerArgCount)
+{
+    // Currently we only link calls with the exact number of arguments.
+    if (callerArgCount == calleeCodeBlock->m_numParameters) {
+        ASSERT(!callLinkInfo->isLinked());
+    
+        calleeCodeBlock->addCaller(callLinkInfo);
+    
+        DataLabelPtr::patch(callLinkInfo->hotPathBegin, callee);
+        Jump::patch(callLinkInfo->hotPathOther, ctiCode);
+    }
+
+    // patch the instruction that jumps out to the cold path, so that we only try to link once.
+    void* patchCheck = reinterpret_cast<void*>(reinterpret_cast<ptrdiff_t>(callLinkInfo->hotPathBegin) + patchOffsetOpCallCompareToJump);
+    Jump::patch(patchCheck, callLinkInfo->coldPathOther);
+}
+
+void JIT::compileOpCallInitializeCallFrame()
+{
+    store32(X86::edx, Address(callFrameRegister, RegisterFile::ArgumentCount * static_cast<int>(sizeof(Register))));
+
+    loadPtr(Address(X86::ecx, FIELD_OFFSET(JSFunction, m_scopeChain) + FIELD_OFFSET(ScopeChain, m_node)), X86::edx); // newScopeChain
+
+    storePtr(ImmPtr(JSValuePtr::encode(noValue())), Address(callFrameRegister, RegisterFile::OptionalCalleeArguments * static_cast<int>(sizeof(Register))));
+    storePtr(X86::ecx, Address(callFrameRegister, RegisterFile::Callee * static_cast<int>(sizeof(Register))));
+    storePtr(X86::edx, Address(callFrameRegister, RegisterFile::ScopeChain * static_cast<int>(sizeof(Register))));
+}
+
+void JIT::compileOpCallSetupArgs(Instruction* instruction)
+{
+    int argCount = instruction[3].u.operand;
+    int registerOffset = instruction[4].u.operand;
+
+    // ecx holds func
+    emitPutJITStubArg(X86::ecx, 1);
+    emitPutJITStubArgConstant(registerOffset, 2);
+    emitPutJITStubArgConstant(argCount, 3);
+}
+
+void JIT::compileOpCallEvalSetupArgs(Instruction* instruction)
+{
+    int argCount = instruction[3].u.operand;
+    int registerOffset = instruction[4].u.operand;
+
+    // ecx holds func
+    emitPutJITStubArg(X86::ecx, 1);
+    emitPutJITStubArgConstant(registerOffset, 2);
+    emitPutJITStubArgConstant(argCount, 3);
+}
+
+void JIT::compileOpConstructSetupArgs(Instruction* instruction)
+{
+    int argCount = instruction[3].u.operand;
+    int registerOffset = instruction[4].u.operand;
+    int proto = instruction[5].u.operand;
+    int thisRegister = instruction[6].u.operand;
+
+    // ecx holds func
+    emitPutJITStubArg(X86::ecx, 1);
+    emitPutJITStubArgConstant(registerOffset, 2);
+    emitPutJITStubArgConstant(argCount, 3);
+    emitPutJITStubArgFromVirtualRegister(proto, 4, X86::eax);
+    emitPutJITStubArgConstant(thisRegister, 5);
+}
+
+#if !ENABLE(JIT_OPTIMIZE_CALL)
+
+void JIT::compileOpCall(OpcodeID opcodeID, Instruction* instruction, unsigned)
+{
+    int dst = instruction[1].u.operand;
+    int callee = instruction[2].u.operand;
+    int argCount = instruction[3].u.operand;
+    int registerOffset = instruction[4].u.operand;
+
+    // Handle eval
+    Jump wasEval;
+    if (opcodeID == op_call_eval) {
+        emitGetVirtualRegister(callee, X86::ecx);
+        compileOpCallEvalSetupArgs(instruction);
+
+        emitCTICall(Interpreter::cti_op_call_eval);
+        wasEval = jnePtr(X86::eax, ImmPtr(JSImmediate::impossibleValue()));
+    }
+
+    emitGetVirtualRegister(callee, X86::ecx);
+    // The arguments have been set up on the hot path for op_call_eval
+    if (opcodeID == op_call)
+        compileOpCallSetupArgs(instruction);
+    else if (opcodeID == op_construct)
+        compileOpConstructSetupArgs(instruction);
+
+    // Check for JSFunctions.
+    emitJumpSlowCaseIfNotJSCell(X86::ecx);
+    addSlowCase(jnePtr(Address(X86::ecx), ImmPtr(m_interpreter->m_jsFunctionVptr)));
+
+    // First, in the case of a construct, allocate the new object.
+    if (opcodeID == op_construct) {
+        emitCTICall(Interpreter::cti_op_construct_JSConstruct);
+        emitPutVirtualRegister(registerOffset - RegisterFile::CallFrameHeaderSize - argCount);
+        emitGetVirtualRegister(callee, X86::ecx);
+    }
+
+    // Speculatively roll the callframe, assuming argCount will match the arity.
+    storePtr(callFrameRegister, Address(callFrameRegister, (RegisterFile::CallerFrame + registerOffset) * static_cast<int>(sizeof(Register))));
+    addPtr(Imm32(registerOffset * static_cast<int>(sizeof(Register))), callFrameRegister);
+    move(Imm32(argCount), X86::edx);
+
+    emitNakedCall(m_interpreter->m_ctiVirtualCall);
+
+    if (opcodeID == op_call_eval)
+        wasEval.link(this);
+
+    // Put the return value in dst. In the interpreter, op_ret does this.
+    emitPutVirtualRegister(dst);
+
+#if ENABLE(CODEBLOCK_SAMPLING)
+    storePtr(ImmPtr(m_codeBlock), m_interpreter->sampler()->codeBlockSlot());
+#endif
+}
+
+void JIT::compileOpCallSlowCase(Instruction* instruction, Vector<SlowCaseEntry>::iterator& iter, unsigned, OpcodeID opcodeID)
+{
+    int dst = instruction[1].u.operand;
+
+    linkSlowCase(iter);
+    linkSlowCase(iter);
+
+    // This handles host functions
+    emitCTICall(((opcodeID == op_construct) ? Interpreter::cti_op_construct_NotJSConstruct : Interpreter::cti_op_call_NotJSFunction));
+    // Put the return value in dst. In the interpreter, op_ret does this.
+    emitPutVirtualRegister(dst);
+
+#if ENABLE(CODEBLOCK_SAMPLING)
+    storePtr(ImmPtr(m_codeBlock), m_interpreter->sampler()->codeBlockSlot());
+#endif
+}
+
+#else
+
+static void unreachable()
+{
+    ASSERT_NOT_REACHED();
+    exit(1);
+}
+
+void JIT::compileOpCall(OpcodeID opcodeID, Instruction* instruction, unsigned callLinkInfoIndex)
+{
+    int dst = instruction[1].u.operand;
+    int callee = instruction[2].u.operand;
+    int argCount = instruction[3].u.operand;
+    int registerOffset = instruction[4].u.operand;
+
+    // Handle eval
+    Jump wasEval;
+    if (opcodeID == op_call_eval) {
+        emitGetVirtualRegister(callee, X86::ecx);
+        compileOpCallEvalSetupArgs(instruction);
+
+        emitCTICall(Interpreter::cti_op_call_eval);
+        wasEval = jnePtr(X86::eax, ImmPtr(JSValuePtr::encode(JSImmediate::impossibleValue())));
+    }
+
+    // This plants a check for a cached JSFunction value, so we can plant a fast link to the callee.
+    // This deliberately leaves the callee in ecx, used when setting up the stack frame below
+    emitGetVirtualRegister(callee, X86::ecx);
+    DataLabelPtr addressOfLinkedFunctionCheck;
+    Jump jumpToSlow = jnePtrWithPatch(X86::ecx, addressOfLinkedFunctionCheck, ImmPtr(JSValuePtr::encode(JSImmediate::impossibleValue())));
+    addSlowCase(jumpToSlow);
+    ASSERT(differenceBetween(addressOfLinkedFunctionCheck, jumpToSlow) == patchOffsetOpCallCompareToJump);
+    m_callStructureStubCompilationInfo[callLinkInfoIndex].hotPathBegin = addressOfLinkedFunctionCheck;
+
+    // The following is the fast case, only used whan a callee can be linked.
+
+    // In the case of OpConstruct, call out to a cti_ function to create the new object.
+    if (opcodeID == op_construct) {
+        int proto = instruction[5].u.operand;
+        int thisRegister = instruction[6].u.operand;
+
+        emitPutJITStubArg(X86::ecx, 1);
+        emitPutJITStubArgFromVirtualRegister(proto, 4, X86::eax);
+        emitCTICall(Interpreter::cti_op_construct_JSConstruct);
+        emitPutVirtualRegister(thisRegister);
+        emitGetVirtualRegister(callee, X86::ecx);
+    }
+
+    // Fast version of stack frame initialization, directly relative to edi.
+    // Note that this omits to set up RegisterFile::CodeBlock, which is set in the callee
+    storePtr(ImmPtr(JSValuePtr::encode(noValue())), Address(callFrameRegister, (registerOffset + RegisterFile::OptionalCalleeArguments) * static_cast<int>(sizeof(Register))));
+    storePtr(X86::ecx, Address(callFrameRegister, (registerOffset + RegisterFile::Callee) * static_cast<int>(sizeof(Register))));
+    loadPtr(Address(X86::ecx, FIELD_OFFSET(JSFunction, m_scopeChain) + FIELD_OFFSET(ScopeChain, m_node)), X86::edx); // newScopeChain
+    store32(Imm32(argCount), Address(callFrameRegister, (registerOffset + RegisterFile::ArgumentCount) * static_cast<int>(sizeof(Register))));
+    storePtr(callFrameRegister, Address(callFrameRegister, (registerOffset + RegisterFile::CallerFrame) * static_cast<int>(sizeof(Register))));
+    storePtr(X86::edx, Address(callFrameRegister, (registerOffset + RegisterFile::ScopeChain) * static_cast<int>(sizeof(Register))));
+    addPtr(Imm32(registerOffset * sizeof(Register)), callFrameRegister);
+
+    // Call to the callee
+    m_callStructureStubCompilationInfo[callLinkInfoIndex].hotPathOther = emitNakedCall(reinterpret_cast<void*>(unreachable));
+    
+    if (opcodeID == op_call_eval)
+        wasEval.link(this);
+
+    // Put the return value in dst. In the interpreter, op_ret does this.
+    emitPutVirtualRegister(dst);
+
+#if ENABLE(CODEBLOCK_SAMPLING)
+        storePtr(ImmPtr(m_codeBlock), m_interpreter->sampler()->codeBlockSlot());
+#endif
+}
+
+void JIT::compileOpCallSlowCase(Instruction* instruction, Vector<SlowCaseEntry>::iterator& iter, unsigned callLinkInfoIndex, OpcodeID opcodeID)
+{
+    int dst = instruction[1].u.operand;
+    int callee = instruction[2].u.operand;
+    int argCount = instruction[3].u.operand;
+    int registerOffset = instruction[4].u.operand;
+
+    linkSlowCase(iter);
+
+    // The arguments have been set up on the hot path for op_call_eval
+    if (opcodeID == op_call)
+        compileOpCallSetupArgs(instruction);
+    else if (opcodeID == op_construct)
+        compileOpConstructSetupArgs(instruction);
+
+    // Fast check for JS function.
+    Jump callLinkFailNotObject = emitJumpIfNotJSCell(X86::ecx);
+    Jump callLinkFailNotJSFunction = jnePtr(Address(X86::ecx), ImmPtr(m_interpreter->m_jsFunctionVptr));
+
+    // First, in the case of a construct, allocate the new object.
+    if (opcodeID == op_construct) {
+        emitCTICall(Interpreter::cti_op_construct_JSConstruct);
+        emitPutVirtualRegister(registerOffset - RegisterFile::CallFrameHeaderSize - argCount);
+        emitGetVirtualRegister(callee, X86::ecx);
+    }
+
+    move(Imm32(argCount), X86::edx);
+
+    // Speculatively roll the callframe, assuming argCount will match the arity.
+    storePtr(callFrameRegister, Address(callFrameRegister, (RegisterFile::CallerFrame + registerOffset) * static_cast<int>(sizeof(Register))));
+    addPtr(Imm32(registerOffset * static_cast<int>(sizeof(Register))), callFrameRegister);
+
+    m_callStructureStubCompilationInfo[callLinkInfoIndex].callReturnLocation =
+        emitNakedCall(m_interpreter->m_ctiVirtualCallPreLink);
+
+    Jump storeResultForFirstRun = jump();
+
+// FIXME: this label can be removed, since it is a fixed offset from 'callReturnLocation'.
+    // This is the address for the cold path *after* the first run (which tries to link the call).
+    m_callStructureStubCompilationInfo[callLinkInfoIndex].coldPathOther = MacroAssembler::Label(this);
+
+    // The arguments have been set up on the hot path for op_call_eval
+    if (opcodeID == op_call)
+        compileOpCallSetupArgs(instruction);
+    else if (opcodeID == op_construct)
+        compileOpConstructSetupArgs(instruction);
+
+    // Check for JSFunctions.
+    Jump isNotObject = emitJumpIfNotJSCell(X86::ecx);
+    Jump isJSFunction = jePtr(Address(X86::ecx), ImmPtr(m_interpreter->m_jsFunctionVptr));
+
+    // This handles host functions
+    isNotObject.link(this);
+    callLinkFailNotObject.link(this);
+    callLinkFailNotJSFunction.link(this);
+    emitCTICall(((opcodeID == op_construct) ? Interpreter::cti_op_construct_NotJSConstruct : Interpreter::cti_op_call_NotJSFunction));
+    Jump wasNotJSFunction = jump();
+
+    // Next, handle JSFunctions...
+    isJSFunction.link(this);
+
+    // First, in the case of a construct, allocate the new object.
+    if (opcodeID == op_construct) {
+        emitCTICall(Interpreter::cti_op_construct_JSConstruct);
+        emitPutVirtualRegister(registerOffset - RegisterFile::CallFrameHeaderSize - argCount);
+        emitGetVirtualRegister(callee, X86::ecx);
+    }
+
+    // Speculatively roll the callframe, assuming argCount will match the arity.
+    storePtr(callFrameRegister, Address(callFrameRegister, (RegisterFile::CallerFrame + registerOffset) * static_cast<int>(sizeof(Register))));
+    addPtr(Imm32(registerOffset * static_cast<int>(sizeof(Register))), callFrameRegister);
+    move(Imm32(argCount), X86::edx);
+
+    emitNakedCall(m_interpreter->m_ctiVirtualCall);
+
+    // Put the return value in dst. In the interpreter, op_ret does this.
+    wasNotJSFunction.link(this);
+    storeResultForFirstRun.link(this);
+    emitPutVirtualRegister(dst);
+
+#if ENABLE(CODEBLOCK_SAMPLING)
+    storePtr(ImmPtr(m_codeBlock), m_interpreter->sampler()->codeBlockSlot());
+#endif
+}
+
+#endif
+
+} // namespace JSC
+
+#endif // ENABLE(JIT)