HostCallReturnValue.cpp   [plain text]

/*
 * Copyright (C) 2012 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 "HostCallReturnValue.h"

#if !ENABLE(C_LOOP)

#include "CallFrame.h"
#include "JSCJSValueInlines.h"
#include "JSObject.h"
#include "JSCInlines.h"
#include <wtf/InlineASM.h>


namespace JSC {

// Note: getHostCallReturnValueWithExecState() needs to be placed before the
// definition of getHostCallReturnValue() below because the Windows build
// requires it.
extern "C" EncodedJSValue HOST_CALL_RETURN_VALUE_OPTION getHostCallReturnValueWithExecState(ExecState* exec)
{
    if (!exec)
        return JSValue::encode(JSValue());
    return JSValue::encode(exec->vm().hostCallReturnValue);
}

#if COMPILER(GCC_COMPATIBLE) && CPU(X86_64)
asm (
".globl " SYMBOL_STRING(getHostCallReturnValue) "\n"
HIDE_SYMBOL(getHostCallReturnValue) "\n"
SYMBOL_STRING(getHostCallReturnValue) ":" "\n"
    "lea -8(%rsp), %rdi\n"
    "jmp " LOCAL_REFERENCE(getHostCallReturnValueWithExecState) "\n"
);

#elif COMPILER(GCC_COMPATIBLE) && CPU(X86)
asm (
".text" "\n" \
".globl " SYMBOL_STRING(getHostCallReturnValue) "\n"
HIDE_SYMBOL(getHostCallReturnValue) "\n"
SYMBOL_STRING(getHostCallReturnValue) ":" "\n"
    "push %ebp\n"
    "mov %esp, %eax\n"
    "leal -4(%esp), %esp\n"
    "push %eax\n"
    "call " LOCAL_REFERENCE(getHostCallReturnValueWithExecState) "\n"
    "leal 8(%esp), %esp\n"
    "pop %ebp\n"
    "ret\n"
);

#elif COMPILER(GCC_COMPATIBLE) && CPU(ARM_THUMB2)
asm (
".text" "\n"
".align 2" "\n"
".globl " SYMBOL_STRING(getHostCallReturnValue) "\n"
HIDE_SYMBOL(getHostCallReturnValue) "\n"
".thumb" "\n"
".thumb_func " THUMB_FUNC_PARAM(getHostCallReturnValue) "\n"
SYMBOL_STRING(getHostCallReturnValue) ":" "\n"
    "sub r0, sp, #8" "\n"
    "b " LOCAL_REFERENCE(getHostCallReturnValueWithExecState) "\n"
);

#elif CPU(ARM64)
asm (
".text" "\n"
".align 2" "\n"
".globl " SYMBOL_STRING(getHostCallReturnValue) "\n"
HIDE_SYMBOL(getHostCallReturnValue) "\n"
SYMBOL_STRING(getHostCallReturnValue) ":" "\n"
     "sub x0, sp, #16" "\n"
     "b " LOCAL_REFERENCE(getHostCallReturnValueWithExecState) "\n"
);

#elif COMPILER(GCC_COMPATIBLE) && CPU(MIPS)

#if WTF_MIPS_PIC
#define LOAD_FUNCTION_TO_T9(function) \
        ".set noreorder" "\n" \
        ".cpload $25" "\n" \
        ".set reorder" "\n" \
        "la $t9, " LOCAL_REFERENCE(function) "\n"
#else
#define LOAD_FUNCTION_TO_T9(function) "" "\n"
#endif

asm (
".text" "\n"
".globl " SYMBOL_STRING(getHostCallReturnValue) "\n"
HIDE_SYMBOL(getHostCallReturnValue) "\n"
SYMBOL_STRING(getHostCallReturnValue) ":" "\n"
    LOAD_FUNCTION_TO_T9(getHostCallReturnValueWithExecState)
    "addi $a0, $sp, -8" "\n"
    "b " LOCAL_REFERENCE(getHostCallReturnValueWithExecState) "\n"
);

#elif COMPILER(MSVC) && CPU(X86)
extern "C" {
    __declspec(naked) EncodedJSValue HOST_CALL_RETURN_VALUE_OPTION getHostCallReturnValue()
    {
        __asm lea eax, [esp - 4]
        __asm mov [esp + 4], eax;
        __asm jmp getHostCallReturnValueWithExecState
    }
}
#endif

} // namespace JSC

#endif // !ENABLE(C_LOOP)