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JITOpcodes32_64.cpp
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1687 lines (1325 loc) · 64.1 KB
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/*
* Copyright (C) 2009 Apple Inc. All rights reserved.
* Copyright (C) 2010 Patrick Gansterer <[email protected]>
*
* 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"
#if ENABLE(JIT)
#if USE(JSVALUE32_64)
#include "JIT.h"
#include "JITInlineMethods.h"
#include "JITStubCall.h"
#include "JSArray.h"
#include "JSCell.h"
#include "JSFunction.h"
#include "JSPropertyNameIterator.h"
#include "LinkBuffer.h"
namespace JSC {
PassRefPtr<ExecutableMemoryHandle> JIT::privateCompileCTIMachineTrampolines(JSGlobalData* globalData, TrampolineStructure *trampolines)
{
// (1) This function provides fast property access for string length
Label stringLengthBegin = align();
// regT0 holds payload, regT1 holds tag
Jump string_failureCases1 = branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag));
Jump string_failureCases2 = branchPtr(NotEqual, Address(regT0, JSCell::classInfoOffset()), TrustedImmPtr(&JSString::s_info));
// Checks out okay! - get the length from the Ustring.
load32(Address(regT0, OBJECT_OFFSETOF(JSString, m_length)), regT2);
Jump string_failureCases3 = branch32(Above, regT2, TrustedImm32(INT_MAX));
move(regT2, regT0);
move(TrustedImm32(JSValue::Int32Tag), regT1);
ret();
JumpList callSlowCase;
JumpList constructSlowCase;
// VirtualCallLink Trampoline
// regT1, regT0 holds callee; callFrame is moved and partially initialized.
Label virtualCallLinkBegin = align();
callSlowCase.append(branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag)));
callSlowCase.append(emitJumpIfNotType(regT0, regT1, JSFunctionType));
// Finish canonical initialization before JS function call.
loadPtr(Address(regT0, OBJECT_OFFSETOF(JSFunction, m_scopeChain)), regT1);
emitPutCellToCallFrameHeader(regT1, RegisterFile::ScopeChain);
// Also initialize ReturnPC for use by lazy linking and exceptions.
preserveReturnAddressAfterCall(regT3);
emitPutToCallFrameHeader(regT3, RegisterFile::ReturnPC);
storePtr(callFrameRegister, &m_globalData->topCallFrame);
restoreArgumentReference();
Call callLazyLinkCall = call();
restoreReturnAddressBeforeReturn(regT3);
jump(regT0);
// VirtualConstructLink Trampoline
// regT1, regT0 holds callee; callFrame is moved and partially initialized.
Label virtualConstructLinkBegin = align();
constructSlowCase.append(branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag)));
constructSlowCase.append(emitJumpIfNotType(regT0, regT1, JSFunctionType));
// Finish canonical initialization before JS function call.
loadPtr(Address(regT0, OBJECT_OFFSETOF(JSFunction, m_scopeChain)), regT1);
emitPutCellToCallFrameHeader(regT1, RegisterFile::ScopeChain);
// Also initialize ReturnPC for use by lazy linking and exeptions.
preserveReturnAddressAfterCall(regT3);
emitPutToCallFrameHeader(regT3, RegisterFile::ReturnPC);
storePtr(callFrameRegister, &m_globalData->topCallFrame);
restoreArgumentReference();
Call callLazyLinkConstruct = call();
restoreReturnAddressBeforeReturn(regT3);
jump(regT0);
// VirtualCall Trampoline
// regT1, regT0 holds callee; regT2 will hold the FunctionExecutable.
Label virtualCallBegin = align();
callSlowCase.append(branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag)));
callSlowCase.append(emitJumpIfNotType(regT0, regT1, JSFunctionType));
// Finish canonical initialization before JS function call.
loadPtr(Address(regT0, OBJECT_OFFSETOF(JSFunction, m_scopeChain)), regT1);
emitPutCellToCallFrameHeader(regT1, RegisterFile::ScopeChain);
loadPtr(Address(regT0, OBJECT_OFFSETOF(JSFunction, m_executable)), regT2);
Jump hasCodeBlock1 = branch32(GreaterThanOrEqual, Address(regT2, OBJECT_OFFSETOF(FunctionExecutable, m_numParametersForCall)), TrustedImm32(0));
preserveReturnAddressAfterCall(regT3);
storePtr(callFrameRegister, &m_globalData->topCallFrame);
restoreArgumentReference();
Call callCompileCall = call();
restoreReturnAddressBeforeReturn(regT3);
loadPtr(Address(regT0, OBJECT_OFFSETOF(JSFunction, m_executable)), regT2);
hasCodeBlock1.link(this);
loadPtr(Address(regT2, OBJECT_OFFSETOF(FunctionExecutable, m_jitCodeForCallWithArityCheck)), regT0);
jump(regT0);
// VirtualConstruct Trampoline
// regT1, regT0 holds callee; regT2 will hold the FunctionExecutable.
Label virtualConstructBegin = align();
constructSlowCase.append(branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag)));
constructSlowCase.append(emitJumpIfNotType(regT0, regT1, JSFunctionType));
// Finish canonical initialization before JS function call.
loadPtr(Address(regT0, OBJECT_OFFSETOF(JSFunction, m_scopeChain)), regT1);
emitPutCellToCallFrameHeader(regT1, RegisterFile::ScopeChain);
loadPtr(Address(regT0, OBJECT_OFFSETOF(JSFunction, m_executable)), regT2);
Jump hasCodeBlock2 = branch32(GreaterThanOrEqual, Address(regT2, OBJECT_OFFSETOF(FunctionExecutable, m_numParametersForConstruct)), TrustedImm32(0));
preserveReturnAddressAfterCall(regT3);
storePtr(callFrameRegister, &m_globalData->topCallFrame);
restoreArgumentReference();
Call callCompileConstruct = call();
restoreReturnAddressBeforeReturn(regT3);
loadPtr(Address(regT0, OBJECT_OFFSETOF(JSFunction, m_executable)), regT2);
hasCodeBlock2.link(this);
loadPtr(Address(regT2, OBJECT_OFFSETOF(FunctionExecutable, m_jitCodeForConstructWithArityCheck)), regT0);
jump(regT0);
callSlowCase.link(this);
// Finish canonical initialization before JS function call.
emitGetFromCallFrameHeaderPtr(RegisterFile::CallerFrame, regT2);
emitGetFromCallFrameHeaderPtr(RegisterFile::ScopeChain, regT2, regT2);
emitPutCellToCallFrameHeader(regT2, RegisterFile::ScopeChain);
// Also initialize ReturnPC and CodeBlock, like a JS function would.
preserveReturnAddressAfterCall(regT3);
emitPutToCallFrameHeader(regT3, RegisterFile::ReturnPC);
emitPutImmediateToCallFrameHeader(0, RegisterFile::CodeBlock);
storePtr(callFrameRegister, &m_globalData->topCallFrame);
restoreArgumentReference();
Call callCallNotJSFunction = call();
emitGetFromCallFrameHeaderPtr(RegisterFile::CallerFrame, callFrameRegister);
restoreReturnAddressBeforeReturn(regT3);
ret();
constructSlowCase.link(this);
// Finish canonical initialization before JS function call.
emitGetFromCallFrameHeaderPtr(RegisterFile::CallerFrame, regT2);
emitGetFromCallFrameHeaderPtr(RegisterFile::ScopeChain, regT2, regT2);
emitPutCellToCallFrameHeader(regT2, RegisterFile::ScopeChain);
// Also initialize ReturnPC and CodeBlock, like a JS function would.
preserveReturnAddressAfterCall(regT3);
emitPutToCallFrameHeader(regT3, RegisterFile::ReturnPC);
emitPutImmediateToCallFrameHeader(0, RegisterFile::CodeBlock);
storePtr(callFrameRegister, &m_globalData->topCallFrame);
restoreArgumentReference();
Call callConstructNotJSFunction = call();
emitGetFromCallFrameHeaderPtr(RegisterFile::CallerFrame, callFrameRegister);
restoreReturnAddressBeforeReturn(regT3);
ret();
// NativeCall Trampoline
Label nativeCallThunk = privateCompileCTINativeCall(globalData);
Label nativeConstructThunk = privateCompileCTINativeCall(globalData, true);
Call string_failureCases1Call = makeTailRecursiveCall(string_failureCases1);
Call string_failureCases2Call = makeTailRecursiveCall(string_failureCases2);
Call string_failureCases3Call = makeTailRecursiveCall(string_failureCases3);
// All trampolines constructed! copy the code, link up calls, and set the pointers on the Machine object.
LinkBuffer patchBuffer(*m_globalData, this, GLOBAL_THUNK_ID);
patchBuffer.link(string_failureCases1Call, FunctionPtr(cti_op_get_by_id_string_fail));
patchBuffer.link(string_failureCases2Call, FunctionPtr(cti_op_get_by_id_string_fail));
patchBuffer.link(string_failureCases3Call, FunctionPtr(cti_op_get_by_id_string_fail));
patchBuffer.link(callLazyLinkCall, FunctionPtr(cti_vm_lazyLinkCall));
patchBuffer.link(callLazyLinkConstruct, FunctionPtr(cti_vm_lazyLinkConstruct));
patchBuffer.link(callCompileCall, FunctionPtr(cti_op_call_jitCompile));
patchBuffer.link(callCompileConstruct, FunctionPtr(cti_op_construct_jitCompile));
patchBuffer.link(callCallNotJSFunction, FunctionPtr(cti_op_call_NotJSFunction));
patchBuffer.link(callConstructNotJSFunction, FunctionPtr(cti_op_construct_NotJSConstruct));
CodeRef finalCode = patchBuffer.finalizeCode();
RefPtr<ExecutableMemoryHandle> executableMemory = finalCode.executableMemory();
trampolines->ctiVirtualCallLink = patchBuffer.trampolineAt(virtualCallLinkBegin);
trampolines->ctiVirtualConstructLink = patchBuffer.trampolineAt(virtualConstructLinkBegin);
trampolines->ctiVirtualCall = patchBuffer.trampolineAt(virtualCallBegin);
trampolines->ctiVirtualConstruct = patchBuffer.trampolineAt(virtualConstructBegin);
trampolines->ctiNativeCall = patchBuffer.trampolineAt(nativeCallThunk);
trampolines->ctiNativeConstruct = patchBuffer.trampolineAt(nativeConstructThunk);
trampolines->ctiStringLengthTrampoline = patchBuffer.trampolineAt(stringLengthBegin);
return executableMemory.release();
}
JIT::Label JIT::privateCompileCTINativeCall(JSGlobalData* globalData, bool isConstruct)
{
int executableOffsetToFunction = isConstruct ? OBJECT_OFFSETOF(NativeExecutable, m_constructor) : OBJECT_OFFSETOF(NativeExecutable, m_function);
Label nativeCallThunk = align();
emitPutImmediateToCallFrameHeader(0, RegisterFile::CodeBlock);
storePtr(callFrameRegister, &m_globalData->topCallFrame);
#if CPU(X86)
// Load caller frame's scope chain into this callframe so that whatever we call can
// get to its global data.
emitGetFromCallFrameHeaderPtr(RegisterFile::CallerFrame, regT0);
emitGetFromCallFrameHeaderPtr(RegisterFile::ScopeChain, regT1, regT0);
emitPutCellToCallFrameHeader(regT1, RegisterFile::ScopeChain);
peek(regT1);
emitPutToCallFrameHeader(regT1, RegisterFile::ReturnPC);
// Calling convention: f(ecx, edx, ...);
// Host function signature: f(ExecState*);
move(callFrameRegister, X86Registers::ecx);
subPtr(TrustedImm32(16 - sizeof(void*)), stackPointerRegister); // Align stack after call.
// call the function
emitGetFromCallFrameHeaderPtr(RegisterFile::Callee, regT1);
loadPtr(Address(regT1, OBJECT_OFFSETOF(JSFunction, m_executable)), regT1);
move(regT0, callFrameRegister); // Eagerly restore caller frame register to avoid loading from stack.
call(Address(regT1, executableOffsetToFunction));
addPtr(TrustedImm32(16 - sizeof(void*)), stackPointerRegister);
#elif CPU(ARM)
// Load caller frame's scope chain into this callframe so that whatever we call can
// get to its global data.
emitGetFromCallFrameHeaderPtr(RegisterFile::CallerFrame, regT2);
emitGetFromCallFrameHeaderPtr(RegisterFile::ScopeChain, regT1, regT2);
emitPutCellToCallFrameHeader(regT1, RegisterFile::ScopeChain);
preserveReturnAddressAfterCall(regT3); // Callee preserved
emitPutToCallFrameHeader(regT3, RegisterFile::ReturnPC);
// Calling convention: f(r0 == regT0, r1 == regT1, ...);
// Host function signature: f(ExecState*);
move(callFrameRegister, ARMRegisters::r0);
// call the function
emitGetFromCallFrameHeaderPtr(RegisterFile::Callee, ARMRegisters::r1);
move(regT2, callFrameRegister); // Eagerly restore caller frame register to avoid loading from stack.
loadPtr(Address(ARMRegisters::r1, OBJECT_OFFSETOF(JSFunction, m_executable)), regT2);
call(Address(regT2, executableOffsetToFunction));
restoreReturnAddressBeforeReturn(regT3);
#elif CPU(SH4)
// Load caller frame's scope chain into this callframe so that whatever we call can
// get to its global data.
emitGetFromCallFrameHeaderPtr(RegisterFile::CallerFrame, regT2);
emitGetFromCallFrameHeaderPtr(RegisterFile::ScopeChain, regT1, regT2);
emitPutCellToCallFrameHeader(regT1, RegisterFile::ScopeChain);
preserveReturnAddressAfterCall(regT3); // Callee preserved
emitPutToCallFrameHeader(regT3, RegisterFile::ReturnPC);
// Calling convention: f(r0 == regT4, r1 == regT5, ...);
// Host function signature: f(ExecState*);
move(callFrameRegister, regT4);
emitGetFromCallFrameHeaderPtr(RegisterFile::Callee, regT5);
move(regT2, callFrameRegister); // Eagerly restore caller frame register to avoid loading from stack.
loadPtr(Address(regT5, OBJECT_OFFSETOF(JSFunction, m_executable)), regT2);
call(Address(regT2, executableOffsetToFunction), regT0);
restoreReturnAddressBeforeReturn(regT3);
#elif CPU(MIPS)
// Load caller frame's scope chain into this callframe so that whatever we call can
// get to its global data.
emitGetFromCallFrameHeaderPtr(RegisterFile::CallerFrame, regT0);
emitGetFromCallFrameHeaderPtr(RegisterFile::ScopeChain, regT1, regT0);
emitPutCellToCallFrameHeader(regT1, RegisterFile::ScopeChain);
preserveReturnAddressAfterCall(regT3); // Callee preserved
emitPutToCallFrameHeader(regT3, RegisterFile::ReturnPC);
// Calling convention: f(a0, a1, a2, a3);
// Host function signature: f(ExecState*);
// Allocate stack space for 16 bytes (8-byte aligned)
// 16 bytes (unused) for 4 arguments
subPtr(TrustedImm32(16), stackPointerRegister);
// Setup arg0
move(callFrameRegister, MIPSRegisters::a0);
// Call
emitGetFromCallFrameHeaderPtr(RegisterFile::Callee, MIPSRegisters::a2);
loadPtr(Address(MIPSRegisters::a2, OBJECT_OFFSETOF(JSFunction, m_executable)), regT2);
move(regT0, callFrameRegister); // Eagerly restore caller frame register to avoid loading from stack.
call(Address(regT2, executableOffsetToFunction));
// Restore stack space
addPtr(TrustedImm32(16), stackPointerRegister);
restoreReturnAddressBeforeReturn(regT3);
#else
#error "JIT not supported on this platform."
UNUSED_PARAM(executableOffsetToFunction);
breakpoint();
#endif // CPU(X86)
// Check for an exception
Jump sawException = branch32(NotEqual, AbsoluteAddress(reinterpret_cast<char*>(&globalData->exception) + OBJECT_OFFSETOF(JSValue, u.asBits.tag)), TrustedImm32(JSValue::EmptyValueTag));
// Return.
ret();
// Handle an exception
sawException.link(this);
// Grab the return address.
preserveReturnAddressAfterCall(regT1);
move(TrustedImmPtr(&globalData->exceptionLocation), regT2);
storePtr(regT1, regT2);
poke(callFrameRegister, OBJECT_OFFSETOF(struct JITStackFrame, callFrame) / sizeof(void*));
storePtr(callFrameRegister, &m_globalData->topCallFrame);
// Set the return address.
move(TrustedImmPtr(FunctionPtr(ctiVMThrowTrampoline).value()), regT1);
restoreReturnAddressBeforeReturn(regT1);
ret();
return nativeCallThunk;
}
JIT::CodeRef JIT::privateCompileCTINativeCall(JSGlobalData* globalData, NativeFunction func)
{
Call nativeCall;
emitPutImmediateToCallFrameHeader(0, RegisterFile::CodeBlock);
storePtr(callFrameRegister, &m_globalData->topCallFrame);
#if CPU(X86)
// Load caller frame's scope chain into this callframe so that whatever we call can
// get to its global data.
emitGetFromCallFrameHeaderPtr(RegisterFile::CallerFrame, regT0);
emitGetFromCallFrameHeaderPtr(RegisterFile::ScopeChain, regT1, regT0);
emitPutCellToCallFrameHeader(regT1, RegisterFile::ScopeChain);
peek(regT1);
emitPutToCallFrameHeader(regT1, RegisterFile::ReturnPC);
// Calling convention: f(ecx, edx, ...);
// Host function signature: f(ExecState*);
move(callFrameRegister, X86Registers::ecx);
subPtr(TrustedImm32(16 - sizeof(void*)), stackPointerRegister); // Align stack after call.
move(regT0, callFrameRegister); // Eagerly restore caller frame register to avoid loading from stack.
// call the function
nativeCall = call();
addPtr(TrustedImm32(16 - sizeof(void*)), stackPointerRegister);
#elif CPU(ARM)
// Load caller frame's scope chain into this callframe so that whatever we call can
// get to its global data.
emitGetFromCallFrameHeaderPtr(RegisterFile::CallerFrame, regT2);
emitGetFromCallFrameHeaderPtr(RegisterFile::ScopeChain, regT1, regT2);
emitPutCellToCallFrameHeader(regT1, RegisterFile::ScopeChain);
preserveReturnAddressAfterCall(regT3); // Callee preserved
emitPutToCallFrameHeader(regT3, RegisterFile::ReturnPC);
// Calling convention: f(r0 == regT0, r1 == regT1, ...);
// Host function signature: f(ExecState*);
move(callFrameRegister, ARMRegisters::r0);
emitGetFromCallFrameHeaderPtr(RegisterFile::Callee, ARMRegisters::r1);
move(regT2, callFrameRegister); // Eagerly restore caller frame register to avoid loading from stack.
loadPtr(Address(ARMRegisters::r1, OBJECT_OFFSETOF(JSFunction, m_executable)), regT2);
// call the function
nativeCall = call();
restoreReturnAddressBeforeReturn(regT3);
#elif CPU(MIPS)
// Load caller frame's scope chain into this callframe so that whatever we call can
// get to its global data.
emitGetFromCallFrameHeaderPtr(RegisterFile::CallerFrame, regT0);
emitGetFromCallFrameHeaderPtr(RegisterFile::ScopeChain, regT1, regT0);
emitPutCellToCallFrameHeader(regT1, RegisterFile::ScopeChain);
preserveReturnAddressAfterCall(regT3); // Callee preserved
emitPutToCallFrameHeader(regT3, RegisterFile::ReturnPC);
// Calling convention: f(a0, a1, a2, a3);
// Host function signature: f(ExecState*);
// Allocate stack space for 16 bytes (8-byte aligned)
// 16 bytes (unused) for 4 arguments
subPtr(TrustedImm32(16), stackPointerRegister);
// Setup arg0
move(callFrameRegister, MIPSRegisters::a0);
// Call
emitGetFromCallFrameHeaderPtr(RegisterFile::Callee, MIPSRegisters::a2);
loadPtr(Address(MIPSRegisters::a2, OBJECT_OFFSETOF(JSFunction, m_executable)), regT2);
move(regT0, callFrameRegister); // Eagerly restore caller frame register to avoid loading from stack.
// call the function
nativeCall = call();
// Restore stack space
addPtr(TrustedImm32(16), stackPointerRegister);
restoreReturnAddressBeforeReturn(regT3);
#elif CPU(SH4)
// Load caller frame's scope chain into this callframe so that whatever we call can
// get to its global data.
emitGetFromCallFrameHeaderPtr(RegisterFile::CallerFrame, regT2);
emitGetFromCallFrameHeaderPtr(RegisterFile::ScopeChain, regT1, regT2);
emitPutCellToCallFrameHeader(regT1, RegisterFile::ScopeChain);
preserveReturnAddressAfterCall(regT3); // Callee preserved
emitPutToCallFrameHeader(regT3, RegisterFile::ReturnPC);
// Calling convention: f(r0 == regT4, r1 == regT5, ...);
// Host function signature: f(ExecState*);
move(callFrameRegister, regT4);
emitGetFromCallFrameHeaderPtr(RegisterFile::Callee, regT5);
move(regT2, callFrameRegister); // Eagerly restore caller frame register to avoid loading from stack.
loadPtr(Address(regT5, OBJECT_OFFSETOF(JSFunction, m_executable)), regT2);
// call the function
nativeCall = call();
restoreReturnAddressBeforeReturn(regT3);
#else
#error "JIT not supported on this platform."
breakpoint();
#endif // CPU(X86)
// Check for an exception
Jump sawException = branch32(NotEqual, AbsoluteAddress(reinterpret_cast<char*>(&globalData->exception) + OBJECT_OFFSETOF(JSValue, u.asBits.tag)), TrustedImm32(JSValue::EmptyValueTag));
// Return.
ret();
// Handle an exception
sawException.link(this);
// Grab the return address.
preserveReturnAddressAfterCall(regT1);
move(TrustedImmPtr(&globalData->exceptionLocation), regT2);
storePtr(regT1, regT2);
poke(callFrameRegister, OBJECT_OFFSETOF(struct JITStackFrame, callFrame) / sizeof(void*));
storePtr(callFrameRegister, &m_globalData->topCallFrame);
// Set the return address.
move(TrustedImmPtr(FunctionPtr(ctiVMThrowTrampoline).value()), regT1);
restoreReturnAddressBeforeReturn(regT1);
ret();
// All trampolines constructed! copy the code, link up calls, and set the pointers on the Machine object.
LinkBuffer patchBuffer(*m_globalData, this, GLOBAL_THUNK_ID);
patchBuffer.link(nativeCall, FunctionPtr(func));
return patchBuffer.finalizeCode();
}
void JIT::emit_op_mov(Instruction* currentInstruction)
{
unsigned dst = currentInstruction[1].u.operand;
unsigned src = currentInstruction[2].u.operand;
if (m_codeBlock->isConstantRegisterIndex(src))
emitStore(dst, getConstantOperand(src));
else {
emitLoad(src, regT1, regT0);
emitStore(dst, regT1, regT0);
map(m_bytecodeOffset + OPCODE_LENGTH(op_mov), dst, regT1, regT0);
}
}
void JIT::emit_op_end(Instruction* currentInstruction)
{
ASSERT(returnValueRegister != callFrameRegister);
emitLoad(currentInstruction[1].u.operand, regT1, regT0);
restoreReturnAddressBeforeReturn(Address(callFrameRegister, RegisterFile::ReturnPC * static_cast<int>(sizeof(Register))));
ret();
}
void JIT::emit_op_jmp(Instruction* currentInstruction)
{
unsigned target = currentInstruction[1].u.operand;
addJump(jump(), target);
}
void JIT::emit_op_new_object(Instruction* currentInstruction)
{
emitAllocateJSFinalObject(TrustedImmPtr(m_codeBlock->globalObject()->emptyObjectStructure()), regT0, regT1);
emitStoreCell(currentInstruction[1].u.operand, regT0);
}
void JIT::emitSlow_op_new_object(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
linkSlowCase(iter);
JITStubCall(this, cti_op_new_object).call(currentInstruction[1].u.operand);
}
void JIT::emit_op_check_has_instance(Instruction* currentInstruction)
{
unsigned baseVal = currentInstruction[1].u.operand;
emitLoadPayload(baseVal, regT0);
// Check that baseVal is a cell.
emitJumpSlowCaseIfNotJSCell(baseVal);
// Check that baseVal 'ImplementsHasInstance'.
loadPtr(Address(regT0, JSCell::structureOffset()), regT0);
addSlowCase(branchTest8(Zero, Address(regT0, Structure::typeInfoFlagsOffset()), TrustedImm32(ImplementsHasInstance)));
}
void JIT::emit_op_instanceof(Instruction* currentInstruction)
{
unsigned dst = currentInstruction[1].u.operand;
unsigned value = currentInstruction[2].u.operand;
unsigned baseVal = currentInstruction[3].u.operand;
unsigned proto = currentInstruction[4].u.operand;
// Load the operands into registers.
// We use regT0 for baseVal since we will be done with this first, and we can then use it for the result.
emitLoadPayload(value, regT2);
emitLoadPayload(baseVal, regT0);
emitLoadPayload(proto, regT1);
// Check that proto are cells. baseVal must be a cell - this is checked by op_check_has_instance.
emitJumpSlowCaseIfNotJSCell(value);
emitJumpSlowCaseIfNotJSCell(proto);
// Check that prototype is an object
loadPtr(Address(regT1, JSCell::structureOffset()), regT3);
addSlowCase(emitJumpIfNotObject(regT3));
// Fixme: this check is only needed because the JSC API allows HasInstance to be overridden; we should deprecate this.
// Check that baseVal 'ImplementsDefaultHasInstance'.
loadPtr(Address(regT0, JSCell::structureOffset()), regT0);
addSlowCase(branchTest8(Zero, Address(regT0, Structure::typeInfoFlagsOffset()), TrustedImm32(ImplementsDefaultHasInstance)));
// Optimistically load the result true, and start looping.
// Initially, regT1 still contains proto and regT2 still contains value.
// As we loop regT2 will be updated with its prototype, recursively walking the prototype chain.
move(TrustedImm32(1), regT0);
Label loop(this);
// Load the prototype of the cell in regT2. If this is equal to regT1 - WIN!
// Otherwise, check if we've hit null - if we have then drop out of the loop, if not go again.
loadPtr(Address(regT2, JSCell::structureOffset()), regT2);
load32(Address(regT2, Structure::prototypeOffset() + OBJECT_OFFSETOF(JSValue, u.asBits.payload)), regT2);
Jump isInstance = branchPtr(Equal, regT2, regT1);
branchTest32(NonZero, regT2).linkTo(loop, this);
// We get here either by dropping out of the loop, or if value was not an Object. Result is false.
move(TrustedImm32(0), regT0);
// isInstance jumps right down to here, to skip setting the result to false (it has already set true).
isInstance.link(this);
emitStoreBool(dst, regT0);
}
void JIT::emitSlow_op_check_has_instance(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
unsigned baseVal = currentInstruction[1].u.operand;
linkSlowCaseIfNotJSCell(iter, baseVal);
linkSlowCase(iter);
JITStubCall stubCall(this, cti_op_check_has_instance);
stubCall.addArgument(baseVal);
stubCall.call();
}
void JIT::emitSlow_op_instanceof(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
unsigned dst = currentInstruction[1].u.operand;
unsigned value = currentInstruction[2].u.operand;
unsigned baseVal = currentInstruction[3].u.operand;
unsigned proto = currentInstruction[4].u.operand;
linkSlowCaseIfNotJSCell(iter, value);
linkSlowCaseIfNotJSCell(iter, proto);
linkSlowCase(iter);
linkSlowCase(iter);
JITStubCall stubCall(this, cti_op_instanceof);
stubCall.addArgument(value);
stubCall.addArgument(baseVal);
stubCall.addArgument(proto);
stubCall.call(dst);
}
void JIT::emit_op_is_undefined(Instruction* currentInstruction)
{
unsigned dst = currentInstruction[1].u.operand;
unsigned value = currentInstruction[2].u.operand;
emitLoad(value, regT1, regT0);
Jump isCell = branch32(Equal, regT1, TrustedImm32(JSValue::CellTag));
compare32(Equal, regT1, TrustedImm32(JSValue::UndefinedTag), regT0);
Jump done = jump();
isCell.link(this);
loadPtr(Address(regT0, JSCell::structureOffset()), regT1);
test8(NonZero, Address(regT1, Structure::typeInfoFlagsOffset()), TrustedImm32(MasqueradesAsUndefined), regT0);
done.link(this);
emitStoreBool(dst, regT0);
}
void JIT::emit_op_is_boolean(Instruction* currentInstruction)
{
unsigned dst = currentInstruction[1].u.operand;
unsigned value = currentInstruction[2].u.operand;
emitLoadTag(value, regT0);
compare32(Equal, regT0, TrustedImm32(JSValue::BooleanTag), regT0);
emitStoreBool(dst, regT0);
}
void JIT::emit_op_is_number(Instruction* currentInstruction)
{
unsigned dst = currentInstruction[1].u.operand;
unsigned value = currentInstruction[2].u.operand;
emitLoadTag(value, regT0);
add32(TrustedImm32(1), regT0);
compare32(Below, regT0, TrustedImm32(JSValue::LowestTag + 1), regT0);
emitStoreBool(dst, regT0);
}
void JIT::emit_op_is_string(Instruction* currentInstruction)
{
unsigned dst = currentInstruction[1].u.operand;
unsigned value = currentInstruction[2].u.operand;
emitLoad(value, regT1, regT0);
Jump isNotCell = branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag));
loadPtr(Address(regT0, JSCell::structureOffset()), regT1);
compare8(Equal, Address(regT1, Structure::typeInfoTypeOffset()), TrustedImm32(StringType), regT0);
Jump done = jump();
isNotCell.link(this);
move(TrustedImm32(0), regT0);
done.link(this);
emitStoreBool(dst, regT0);
}
void JIT::emit_op_tear_off_activation(Instruction* currentInstruction)
{
unsigned activation = currentInstruction[1].u.operand;
unsigned arguments = currentInstruction[2].u.operand;
Jump activationCreated = branch32(NotEqual, tagFor(activation), TrustedImm32(JSValue::EmptyValueTag));
Jump argumentsNotCreated = branch32(Equal, tagFor(arguments), TrustedImm32(JSValue::EmptyValueTag));
activationCreated.link(this);
JITStubCall stubCall(this, cti_op_tear_off_activation);
stubCall.addArgument(currentInstruction[1].u.operand);
stubCall.addArgument(unmodifiedArgumentsRegister(currentInstruction[2].u.operand));
stubCall.call();
argumentsNotCreated.link(this);
}
void JIT::emit_op_tear_off_arguments(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
Jump argsNotCreated = branch32(Equal, tagFor(unmodifiedArgumentsRegister(dst)), TrustedImm32(JSValue::EmptyValueTag));
JITStubCall stubCall(this, cti_op_tear_off_arguments);
stubCall.addArgument(unmodifiedArgumentsRegister(dst));
stubCall.call();
argsNotCreated.link(this);
}
void JIT::emit_op_resolve(Instruction* currentInstruction)
{
JITStubCall stubCall(this, cti_op_resolve);
stubCall.addArgument(TrustedImmPtr(&m_codeBlock->identifier(currentInstruction[2].u.operand)));
stubCall.callWithValueProfiling(currentInstruction[1].u.operand);
}
void JIT::emit_op_to_primitive(Instruction* currentInstruction)
{
int dst = currentInstruction[1].u.operand;
int src = currentInstruction[2].u.operand;
emitLoad(src, regT1, regT0);
Jump isImm = branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag));
addSlowCase(branchPtr(NotEqual, Address(regT0, JSCell::classInfoOffset()), TrustedImmPtr(&JSString::s_info)));
isImm.link(this);
if (dst != src)
emitStore(dst, regT1, regT0);
map(m_bytecodeOffset + OPCODE_LENGTH(op_to_primitive), dst, regT1, regT0);
}
void JIT::emitSlow_op_to_primitive(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
int dst = currentInstruction[1].u.operand;
linkSlowCase(iter);
JITStubCall stubCall(this, cti_op_to_primitive);
stubCall.addArgument(regT1, regT0);
stubCall.call(dst);
}
void JIT::emit_op_strcat(Instruction* currentInstruction)
{
JITStubCall stubCall(this, cti_op_strcat);
stubCall.addArgument(TrustedImm32(currentInstruction[2].u.operand));
stubCall.addArgument(TrustedImm32(currentInstruction[3].u.operand));
stubCall.call(currentInstruction[1].u.operand);
}
void JIT::emit_op_resolve_base(Instruction* currentInstruction)
{
JITStubCall stubCall(this, currentInstruction[3].u.operand ? cti_op_resolve_base_strict_put : cti_op_resolve_base);
stubCall.addArgument(TrustedImmPtr(&m_codeBlock->identifier(currentInstruction[2].u.operand)));
stubCall.callWithValueProfiling(currentInstruction[1].u.operand);
}
void JIT::emit_op_ensure_property_exists(Instruction* currentInstruction)
{
JITStubCall stubCall(this, cti_op_ensure_property_exists);
stubCall.addArgument(TrustedImm32(currentInstruction[1].u.operand));
stubCall.addArgument(TrustedImmPtr(&m_codeBlock->identifier(currentInstruction[2].u.operand)));
stubCall.call(currentInstruction[1].u.operand);
}
void JIT::emit_op_resolve_skip(Instruction* currentInstruction)
{
JITStubCall stubCall(this, cti_op_resolve_skip);
stubCall.addArgument(TrustedImmPtr(&m_codeBlock->identifier(currentInstruction[2].u.operand)));
stubCall.addArgument(TrustedImm32(currentInstruction[3].u.operand));
stubCall.callWithValueProfiling(currentInstruction[1].u.operand);
}
void JIT::emit_op_resolve_global(Instruction* currentInstruction, bool dynamic)
{
// FIXME: Optimize to use patching instead of so many memory accesses.
unsigned dst = currentInstruction[1].u.operand;
void* globalObject = m_codeBlock->globalObject();
unsigned currentIndex = m_globalResolveInfoIndex++;
GlobalResolveInfo* resolveInfoAddress = &m_codeBlock->globalResolveInfo(currentIndex);
// Verify structure.
move(TrustedImmPtr(globalObject), regT0);
move(TrustedImmPtr(resolveInfoAddress), regT3);
loadPtr(Address(regT3, OBJECT_OFFSETOF(GlobalResolveInfo, structure)), regT1);
addSlowCase(branchPtr(NotEqual, regT1, Address(regT0, JSCell::structureOffset())));
// Load property.
loadPtr(Address(regT0, OBJECT_OFFSETOF(JSGlobalObject, m_propertyStorage)), regT2);
load32(Address(regT3, OBJECT_OFFSETOF(GlobalResolveInfo, offset)), regT3);
load32(BaseIndex(regT2, regT3, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.payload)), regT0); // payload
load32(BaseIndex(regT2, regT3, TimesEight, OBJECT_OFFSETOF(JSValue, u.asBits.tag)), regT1); // tag
emitValueProfilingSite();
emitStore(dst, regT1, regT0);
map(m_bytecodeOffset + (dynamic ? OPCODE_LENGTH(op_resolve_global_dynamic) : OPCODE_LENGTH(op_resolve_global)), dst, regT1, regT0);
}
void JIT::emitSlow_op_resolve_global(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
unsigned dst = currentInstruction[1].u.operand;
Identifier* ident = &m_codeBlock->identifier(currentInstruction[2].u.operand);
unsigned currentIndex = m_globalResolveInfoIndex++;
linkSlowCase(iter);
JITStubCall stubCall(this, cti_op_resolve_global);
stubCall.addArgument(TrustedImmPtr(ident));
stubCall.addArgument(TrustedImm32(currentIndex));
stubCall.callWithValueProfiling(dst);
}
void JIT::emit_op_not(Instruction* currentInstruction)
{
unsigned dst = currentInstruction[1].u.operand;
unsigned src = currentInstruction[2].u.operand;
emitLoadTag(src, regT0);
emitLoad(src, regT1, regT0);
addSlowCase(branch32(NotEqual, regT1, TrustedImm32(JSValue::BooleanTag)));
xor32(TrustedImm32(1), regT0);
emitStoreBool(dst, regT0, (dst == src));
}
void JIT::emitSlow_op_not(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
unsigned dst = currentInstruction[1].u.operand;
unsigned src = currentInstruction[2].u.operand;
linkSlowCase(iter);
JITStubCall stubCall(this, cti_op_not);
stubCall.addArgument(src);
stubCall.call(dst);
}
void JIT::emit_op_jfalse(Instruction* currentInstruction)
{
unsigned cond = currentInstruction[1].u.operand;
unsigned target = currentInstruction[2].u.operand;
emitLoad(cond, regT1, regT0);
ASSERT((JSValue::BooleanTag + 1 == JSValue::Int32Tag) && !(JSValue::Int32Tag + 1));
addSlowCase(branch32(Below, regT1, TrustedImm32(JSValue::BooleanTag)));
addJump(branchTest32(Zero, regT0), target);
}
void JIT::emitSlow_op_jfalse(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
unsigned cond = currentInstruction[1].u.operand;
unsigned target = currentInstruction[2].u.operand;
linkSlowCase(iter);
if (supportsFloatingPoint()) {
// regT1 contains the tag from the hot path.
Jump notNumber = branch32(Above, regT1, TrustedImm32(JSValue::LowestTag));
emitLoadDouble(cond, fpRegT0);
emitJumpSlowToHot(branchDoubleZeroOrNaN(fpRegT0, fpRegT1), target);
emitJumpSlowToHot(jump(), OPCODE_LENGTH(op_jfalse));
notNumber.link(this);
}
JITStubCall stubCall(this, cti_op_jtrue);
stubCall.addArgument(cond);
stubCall.call();
emitJumpSlowToHot(branchTest32(Zero, regT0), target); // Inverted.
}
void JIT::emit_op_jtrue(Instruction* currentInstruction)
{
unsigned cond = currentInstruction[1].u.operand;
unsigned target = currentInstruction[2].u.operand;
emitLoad(cond, regT1, regT0);
ASSERT((JSValue::BooleanTag + 1 == JSValue::Int32Tag) && !(JSValue::Int32Tag + 1));
addSlowCase(branch32(Below, regT1, TrustedImm32(JSValue::BooleanTag)));
addJump(branchTest32(NonZero, regT0), target);
}
void JIT::emitSlow_op_jtrue(Instruction* currentInstruction, Vector<SlowCaseEntry>::iterator& iter)
{
unsigned cond = currentInstruction[1].u.operand;
unsigned target = currentInstruction[2].u.operand;
linkSlowCase(iter);
if (supportsFloatingPoint()) {
// regT1 contains the tag from the hot path.
Jump notNumber = branch32(Above, regT1, TrustedImm32(JSValue::LowestTag));
emitLoadDouble(cond, fpRegT0);
emitJumpSlowToHot(branchDoubleNonZero(fpRegT0, fpRegT1), target);
emitJumpSlowToHot(jump(), OPCODE_LENGTH(op_jtrue));
notNumber.link(this);
}
JITStubCall stubCall(this, cti_op_jtrue);
stubCall.addArgument(cond);
stubCall.call();
emitJumpSlowToHot(branchTest32(NonZero, regT0), target);
}
void JIT::emit_op_jeq_null(Instruction* currentInstruction)
{
unsigned src = currentInstruction[1].u.operand;
unsigned target = currentInstruction[2].u.operand;
emitLoad(src, regT1, regT0);
Jump isImmediate = branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag));
// First, handle JSCell cases - check MasqueradesAsUndefined bit on the structure.
loadPtr(Address(regT0, JSCell::structureOffset()), regT2);
addJump(branchTest8(NonZero, Address(regT2, Structure::typeInfoFlagsOffset()), TrustedImm32(MasqueradesAsUndefined)), target);
Jump wasNotImmediate = jump();
// Now handle the immediate cases - undefined & null
isImmediate.link(this);
ASSERT((JSValue::UndefinedTag + 1 == JSValue::NullTag) && (JSValue::NullTag & 0x1));
or32(TrustedImm32(1), regT1);
addJump(branch32(Equal, regT1, TrustedImm32(JSValue::NullTag)), target);
wasNotImmediate.link(this);
}
void JIT::emit_op_jneq_null(Instruction* currentInstruction)
{
unsigned src = currentInstruction[1].u.operand;
unsigned target = currentInstruction[2].u.operand;
emitLoad(src, regT1, regT0);
Jump isImmediate = branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag));
// First, handle JSCell cases - check MasqueradesAsUndefined bit on the structure.
loadPtr(Address(regT0, JSCell::structureOffset()), regT2);
addJump(branchTest8(Zero, Address(regT2, Structure::typeInfoFlagsOffset()), TrustedImm32(MasqueradesAsUndefined)), target);
Jump wasNotImmediate = jump();
// Now handle the immediate cases - undefined & null
isImmediate.link(this);
ASSERT((JSValue::UndefinedTag + 1 == JSValue::NullTag) && (JSValue::NullTag & 0x1));
or32(TrustedImm32(1), regT1);
addJump(branch32(NotEqual, regT1, TrustedImm32(JSValue::NullTag)), target);
wasNotImmediate.link(this);
}
void JIT::emit_op_jneq_ptr(Instruction* currentInstruction)
{
unsigned src = currentInstruction[1].u.operand;
JSCell* ptr = currentInstruction[2].u.jsCell.get();
unsigned target = currentInstruction[3].u.operand;
emitLoad(src, regT1, regT0);
addJump(branch32(NotEqual, regT1, TrustedImm32(JSValue::CellTag)), target);
addJump(branchPtr(NotEqual, regT0, TrustedImmPtr(ptr)), target);
}
void JIT::emit_op_eq(Instruction* currentInstruction)
{
unsigned dst = currentInstruction[1].u.operand;
unsigned src1 = currentInstruction[2].u.operand;
unsigned src2 = currentInstruction[3].u.operand;
emitLoad2(src1, regT1, regT0, src2, regT3, regT2);
addSlowCase(branch32(NotEqual, regT1, regT3));
addSlowCase(branch32(Equal, regT1, TrustedImm32(JSValue::CellTag)));
addSlowCase(branch32(Below, regT1, TrustedImm32(JSValue::LowestTag)));
compare32(Equal, regT0, regT2, regT0);
emitStoreBool(dst, regT0);
}