Source/JavaScriptCore/llint/LLIntEntrypoint.cpp

/*
 * Copyright (C) 2012-2018 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
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 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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#include "config.h"
#include "LLIntEntrypoint.h"
#include "CodeBlock.h"
#include "HeapInlines.h"
#include "JITCode.h"
#include "JSCellInlines.h"
#include "JSObject.h"
#include "LLIntThunks.h"
#include "LowLevelInterpreter.h"
#include "MaxFrameExtentForSlowPathCall.h"
#include "StackAlignment.h"
#include "VM.h"

namespace JSC { namespace LLInt {

static void setFunctionEntrypoint(VM& vm, CodeBlock* codeBlock)
{
    CodeSpecializationKind kind = codeBlock->specializationKind();
    
#if ENABLE(JIT)
    if (VM::canUseJIT()) {
        if (kind == CodeForCall) {
            codeBlock->setJITCode(
                adoptRef(*new DirectJITCode(vm.getCTIStub(functionForCallEntryThunkGenerator).retagged<JSEntryPtrTag>(), vm.getCTIStub(functionForCallArityCheckThunkGenerator).retaggedCode<JSEntryPtrTag>(), JITCode::InterpreterThunk)));
            return;
        }
        ASSERT(kind == CodeForConstruct);
        codeBlock->setJITCode(
            adoptRef(*new DirectJITCode(vm.getCTIStub(functionForConstructEntryThunkGenerator).retagged<JSEntryPtrTag>(), vm.getCTIStub(functionForConstructArityCheckThunkGenerator).retaggedCode<JSEntryPtrTag>(), JITCode::InterpreterThunk)));
        return;
    }
#endif // ENABLE(JIT)

    UNUSED_PARAM(vm);
    if (kind == CodeForCall) {
        codeBlock->setJITCode(
            adoptRef(*new DirectJITCode(getCodeRef<JSEntryPtrTag>(llint_function_for_call_prologue), getCodePtr<JSEntryPtrTag>(llint_function_for_call_arity_check), JITCode::InterpreterThunk)));
        return;
    }
    ASSERT(kind == CodeForConstruct);
    codeBlock->setJITCode(
        adoptRef(*new DirectJITCode(getCodeRef<JSEntryPtrTag>(llint_function_for_construct_prologue), getCodePtr<JSEntryPtrTag>(llint_function_for_construct_arity_check), JITCode::InterpreterThunk)));
}

static void setEvalEntrypoint(VM& vm, CodeBlock* codeBlock)
{
#if ENABLE(JIT)
    if (VM::canUseJIT()) {
        MacroAssemblerCodeRef<JSEntryPtrTag> codeRef = vm.getCTIStub(evalEntryThunkGenerator).retagged<JSEntryPtrTag>();
        codeBlock->setJITCode(
            adoptRef(*new DirectJITCode(codeRef, codeRef.code(), JITCode::InterpreterThunk)));
        return;
    }
#endif // ENABLE(JIT)

    UNUSED_PARAM(vm);
    MacroAssemblerCodeRef<JSEntryPtrTag> codeRef = getCodeRef<JSEntryPtrTag>(llint_eval_prologue);
    codeBlock->setJITCode(
        adoptRef(*new DirectJITCode(codeRef, codeRef.code(), JITCode::InterpreterThunk)));
}

static void setProgramEntrypoint(VM& vm, CodeBlock* codeBlock)
{
#if ENABLE(JIT)
    if (VM::canUseJIT()) {
        MacroAssemblerCodeRef<JSEntryPtrTag> codeRef = vm.getCTIStub(programEntryThunkGenerator).retagged<JSEntryPtrTag>();
        codeBlock->setJITCode(
            adoptRef(*new DirectJITCode(codeRef, codeRef.code(), JITCode::InterpreterThunk)));
        return;
    }
#endif // ENABLE(JIT)

    UNUSED_PARAM(vm);
    MacroAssemblerCodeRef<JSEntryPtrTag> codeRef = getCodeRef<JSEntryPtrTag>(llint_program_prologue);
    codeBlock->setJITCode(
        adoptRef(*new DirectJITCode(codeRef, codeRef.code(), JITCode::InterpreterThunk)));
}

static void setModuleProgramEntrypoint(VM& vm, CodeBlock* codeBlock)
{
#if ENABLE(JIT)
    if (VM::canUseJIT()) {
        MacroAssemblerCodeRef<JSEntryPtrTag> codeRef = vm.getCTIStub(moduleProgramEntryThunkGenerator).retagged<JSEntryPtrTag>();
        codeBlock->setJITCode(
            adoptRef(*new DirectJITCode(codeRef, codeRef.code(), JITCode::InterpreterThunk)));
        return;
    }
#endif // ENABLE(JIT)

    UNUSED_PARAM(vm);
    MacroAssemblerCodeRef<JSEntryPtrTag> codeRef = getCodeRef<JSEntryPtrTag>(llint_module_program_prologue).retagged<JSEntryPtrTag>();
    codeBlock->setJITCode(
        adoptRef(*new DirectJITCode(codeRef, codeRef.code(), JITCode::InterpreterThunk)));
}

void setEntrypoint(VM& vm, CodeBlock* codeBlock)
{
    switch (codeBlock->codeType()) {
    case GlobalCode:
        setProgramEntrypoint(vm, codeBlock);
        return;
    case ModuleCode:
        setModuleProgramEntrypoint(vm, codeBlock);
        return;
    case EvalCode:
        setEvalEntrypoint(vm, codeBlock);
        return;
    case FunctionCode:
        setFunctionEntrypoint(vm, codeBlock);
        return;
    }
    
    RELEASE_ASSERT_NOT_REACHED();
}

unsigned frameRegisterCountFor(CodeBlock* codeBlock)
{
    ASSERT(static_cast<unsigned>(codeBlock->m_numCalleeLocals) == WTF::roundUpToMultipleOf(stackAlignmentRegisters(), static_cast<unsigned>(codeBlock->m_numCalleeLocals)));

    return roundLocalRegisterCountForFramePointerOffset(codeBlock->m_numCalleeLocals + maxFrameExtentForSlowPathCallInRegisters);
}

} } // namespace JSC::LLInt