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gecko/js/src/jsval.h

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=4 sw=4 et tw=99 ft=cpp:
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla SpiderMonkey JavaScript 1.9 code, released
* June 30, 2010
*
* The Initial Developer of the Original Code is
* the Mozilla Corporation.
*
* Contributor(s):
* Luke Wagner <lw@mozilla.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef jsvalimpl_h__
#define jsvalimpl_h__
/*
* JS value implementation details for operations on jsval and jsid.
* Embeddings should not rely on any of the definitions in this file. For a
* description of the value representation and the engine-internal C++ value
* interface, js::Value, see jsvalue.h.
*/
#include "jsutil.h"
JS_BEGIN_EXTERN_C
/*
* Try to get jsvals 64-bit aligned. We could almost assert that all values are
* aligned, but MSVC and GCC occasionally break alignment.
*/
#if defined(__GNUC__) || defined(__xlc__) || defined(__xlC__)
# define JSVAL_ALIGNMENT __attribute__((aligned (8)))
#elif defined(_MSC_VER)
/*
* Structs can be aligned with MSVC, but not if they are used as parameters,
* so we just don't try to align.
*/
# define JSVAL_ALIGNMENT
#elif defined(__SUNPRO_C) || defined(__SUNPRO_CC)
# define JSVAL_ALIGNMENT
#elif defined(__HP_cc) || defined(__HP_aCC)
# define JSVAL_ALIGNMENT
#endif
#if JS_BITS_PER_WORD == 64
# define JSVAL_TAG_SHIFT 47
#endif
/*
* We try to use enums so that printing a jsval_layout in the debugger shows
* nice symbolic type tags, however we can only do this when we can force the
* underlying type of the enum to be the desired size.
*/
#if defined(__cplusplus) && !defined(__SUNPRO_CC) && !defined(__xlC__)
#if defined(_MSC_VER)
# define JS_ENUM_HEADER(id, type) enum id : type
# define JS_ENUM_MEMBER(id, type, value) id = (type)value,
# define JS_LAST_ENUM_MEMBER(id, type, value) id = (type)value
# define JS_ENUM_FOOTER(id)
#else
# define JS_ENUM_HEADER(id, type) enum id
# define JS_ENUM_MEMBER(id, type, value) id = (type)value,
# define JS_LAST_ENUM_MEMBER(id, type, value) id = (type)value
# define JS_ENUM_FOOTER(id) __attribute__((packed))
#endif
/* Remember to propagate changes to the C defines below. */
JS_ENUM_HEADER(JSValueType, uint8)
{
JSVAL_TYPE_DOUBLE = 0x00,
JSVAL_TYPE_INT32 = 0x01,
JSVAL_TYPE_UNDEFINED = 0x02,
JSVAL_TYPE_BOOLEAN = 0x03,
JSVAL_TYPE_MAGIC = 0x04,
JSVAL_TYPE_STRING = 0x05,
JSVAL_TYPE_NULL = 0x06,
JSVAL_TYPE_OBJECT = 0x07,
/* The below types never appear in a jsval; they are only used in tracing. */
JSVAL_TYPE_NONFUNOBJ = 0x57,
JSVAL_TYPE_FUNOBJ = 0x67,
JSVAL_TYPE_STRORNULL = 0x77,
JSVAL_TYPE_OBJORNULL = 0x78,
JSVAL_TYPE_BOXED = 0x79
} JS_ENUM_FOOTER(JSValueType);
JS_STATIC_ASSERT(sizeof(JSValueType) == 1);
#if JS_BITS_PER_WORD == 32
/* Remember to propagate changes to the C defines below. */
JS_ENUM_HEADER(JSValueTag, uint32)
{
JSVAL_TAG_CLEAR = 0xFFFFFF80,
JSVAL_TAG_INT32 = JSVAL_TAG_CLEAR | JSVAL_TYPE_INT32,
JSVAL_TAG_UNDEFINED = JSVAL_TAG_CLEAR | JSVAL_TYPE_UNDEFINED,
JSVAL_TAG_STRING = JSVAL_TAG_CLEAR | JSVAL_TYPE_STRING,
JSVAL_TAG_BOOLEAN = JSVAL_TAG_CLEAR | JSVAL_TYPE_BOOLEAN,
JSVAL_TAG_MAGIC = JSVAL_TAG_CLEAR | JSVAL_TYPE_MAGIC,
JSVAL_TAG_NULL = JSVAL_TAG_CLEAR | JSVAL_TYPE_NULL,
JSVAL_TAG_OBJECT = JSVAL_TAG_CLEAR | JSVAL_TYPE_OBJECT
} JS_ENUM_FOOTER(JSValueTag);
JS_STATIC_ASSERT(sizeof(JSValueTag) == 4);
#elif JS_BITS_PER_WORD == 64
/* Remember to propagate changes to the C defines below. */
JS_ENUM_HEADER(JSValueTag, uint32)
{
JSVAL_TAG_MAX_DOUBLE = 0x1FFF0,
JSVAL_TAG_INT32 = JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_INT32,
JSVAL_TAG_UNDEFINED = JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_UNDEFINED,
JSVAL_TAG_STRING = JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_STRING,
JSVAL_TAG_BOOLEAN = JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_BOOLEAN,
JSVAL_TAG_MAGIC = JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_MAGIC,
JSVAL_TAG_NULL = JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_NULL,
JSVAL_TAG_OBJECT = JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_OBJECT
} JS_ENUM_FOOTER(JSValueTag);
JS_STATIC_ASSERT(sizeof(JSValueTag) == sizeof(uint32));
JS_ENUM_HEADER(JSValueShiftedTag, uint64)
{
JSVAL_SHIFTED_TAG_MAX_DOUBLE = ((((uint64)JSVAL_TAG_MAX_DOUBLE) << JSVAL_TAG_SHIFT) | 0xFFFFFFFF),
JSVAL_SHIFTED_TAG_INT32 = (((uint64)JSVAL_TAG_INT32) << JSVAL_TAG_SHIFT),
JSVAL_SHIFTED_TAG_UNDEFINED = (((uint64)JSVAL_TAG_UNDEFINED) << JSVAL_TAG_SHIFT),
JSVAL_SHIFTED_TAG_STRING = (((uint64)JSVAL_TAG_STRING) << JSVAL_TAG_SHIFT),
JSVAL_SHIFTED_TAG_BOOLEAN = (((uint64)JSVAL_TAG_BOOLEAN) << JSVAL_TAG_SHIFT),
JSVAL_SHIFTED_TAG_MAGIC = (((uint64)JSVAL_TAG_MAGIC) << JSVAL_TAG_SHIFT),
JSVAL_SHIFTED_TAG_NULL = (((uint64)JSVAL_TAG_NULL) << JSVAL_TAG_SHIFT),
JSVAL_SHIFTED_TAG_OBJECT = (((uint64)JSVAL_TAG_OBJECT) << JSVAL_TAG_SHIFT)
} JS_ENUM_FOOTER(JSValueShiftedTag);
JS_STATIC_ASSERT(sizeof(JSValueShiftedTag) == sizeof(uint64));
#endif
#else /* defined(__cplusplus) */
typedef uint8 JSValueType;
#define JSVAL_TYPE_DOUBLE ((uint8)0x00)
#define JSVAL_TYPE_INT32 ((uint8)0x01)
#define JSVAL_TYPE_UNDEFINED ((uint8)0x02)
#define JSVAL_TYPE_BOOLEAN ((uint8)0x03)
#define JSVAL_TYPE_MAGIC ((uint8)0x04)
#define JSVAL_TYPE_STRING ((uint8)0x05)
#define JSVAL_TYPE_NULL ((uint8)0x06)
#define JSVAL_TYPE_OBJECT ((uint8)0x07)
#define JSVAL_TYPE_NONFUNOBJ ((uint8)0x57)
#define JSVAL_TYPE_FUNOBJ ((uint8)0x67)
#define JSVAL_TYPE_STRORNULL ((uint8)0x77)
#define JSVAL_TYPE_OBJORNULL ((uint8)0x78)
#define JSVAL_TYPE_BOXED ((uint8)0x79)
#define JSVAL_TYPE_UNINITIALIZED ((uint8)0x7d)
#if JS_BITS_PER_WORD == 32
typedef uint32 JSValueTag;
#define JSVAL_TAG_CLEAR ((uint32)(0xFFFFFF80))
#define JSVAL_TAG_INT32 ((uint32)(JSVAL_TAG_CLEAR | JSVAL_TYPE_INT32))
#define JSVAL_TAG_UNDEFINED ((uint32)(JSVAL_TAG_CLEAR | JSVAL_TYPE_UNDEFINED))
#define JSVAL_TAG_STRING ((uint32)(JSVAL_TAG_CLEAR | JSVAL_TYPE_STRING))
#define JSVAL_TAG_BOOLEAN ((uint32)(JSVAL_TAG_CLEAR | JSVAL_TYPE_BOOLEAN))
#define JSVAL_TAG_MAGIC ((uint32)(JSVAL_TAG_CLEAR | JSVAL_TYPE_MAGIC))
#define JSVAL_TAG_NULL ((uint32)(JSVAL_TAG_CLEAR | JSVAL_TYPE_NULL))
#define JSVAL_TAG_OBJECT ((uint32)(JSVAL_TAG_CLEAR | JSVAL_TYPE_OBJECT))
#elif JS_BITS_PER_WORD == 64
typedef uint32 JSValueTag;
#define JSVAL_TAG_MAX_DOUBLE ((uint32)(0x1FFF0))
#define JSVAL_TAG_INT32 (uint32)(JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_INT32)
#define JSVAL_TAG_UNDEFINED (uint32)(JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_UNDEFINED)
#define JSVAL_TAG_STRING (uint32)(JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_STRING)
#define JSVAL_TAG_BOOLEAN (uint32)(JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_BOOLEAN)
#define JSVAL_TAG_MAGIC (uint32)(JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_MAGIC)
#define JSVAL_TAG_NULL (uint32)(JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_NULL)
#define JSVAL_TAG_OBJECT (uint32)(JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_OBJECT)
typedef uint64 JSValueShiftedTag;
#define JSVAL_SHIFTED_TAG_MAX_DOUBLE ((((uint64)JSVAL_TAG_MAX_DOUBLE) << JSVAL_TAG_SHIFT) | 0xFFFFFFFF)
#define JSVAL_SHIFTED_TAG_INT32 (((uint64)JSVAL_TAG_INT32) << JSVAL_TAG_SHIFT)
#define JSVAL_SHIFTED_TAG_UNDEFINED (((uint64)JSVAL_TAG_UNDEFINED) << JSVAL_TAG_SHIFT)
#define JSVAL_SHIFTED_TAG_STRING (((uint64)JSVAL_TAG_STRING) << JSVAL_TAG_SHIFT)
#define JSVAL_SHIFTED_TAG_BOOLEAN (((uint64)JSVAL_TAG_BOOLEAN) << JSVAL_TAG_SHIFT)
#define JSVAL_SHIFTED_TAG_MAGIC (((uint64)JSVAL_TAG_MAGIC) << JSVAL_TAG_SHIFT)
#define JSVAL_SHIFTED_TAG_NULL (((uint64)JSVAL_TAG_NULL) << JSVAL_TAG_SHIFT)
#define JSVAL_SHIFTED_TAG_OBJECT (((uint64)JSVAL_TAG_OBJECT) << JSVAL_TAG_SHIFT)
#endif /* JS_BITS_PER_WORD */
#endif /* defined(__cplusplus) && !defined(__SUNPRO_CC) */
#define JSVAL_LOWER_INCL_TYPE_OF_OBJ_OR_NULL_SET JSVAL_TYPE_NULL
#define JSVAL_UPPER_EXCL_TYPE_OF_PRIMITIVE_SET JSVAL_TYPE_OBJECT
#define JSVAL_UPPER_INCL_TYPE_OF_NUMBER_SET JSVAL_TYPE_INT32
#define JSVAL_LOWER_INCL_TYPE_OF_PTR_PAYLOAD_SET JSVAL_TYPE_MAGIC
#define JSVAL_UPPER_INCL_TYPE_OF_VALUE_SET JSVAL_TYPE_OBJECT
#define JSVAL_UPPER_INCL_TYPE_OF_BOXABLE_SET JSVAL_TYPE_FUNOBJ
#if JS_BITS_PER_WORD == 32
#define JSVAL_TYPE_TO_TAG(type) ((JSValueTag)(JSVAL_TAG_CLEAR | (type)))
#define JSVAL_LOWER_INCL_TAG_OF_OBJ_OR_NULL_SET JSVAL_TAG_NULL
#define JSVAL_UPPER_EXCL_TAG_OF_PRIMITIVE_SET JSVAL_TAG_OBJECT
#define JSVAL_UPPER_INCL_TAG_OF_NUMBER_SET JSVAL_TAG_INT32
#define JSVAL_LOWER_INCL_TAG_OF_GCTHING_SET JSVAL_TAG_STRING
#elif JS_BITS_PER_WORD == 64
#define JSVAL_PAYLOAD_MASK 0x00007FFFFFFFFFFFLL
#define JSVAL_TAG_MASK 0xFFFF800000000000LL
#define JSVAL_TYPE_TO_TAG(type) ((JSValueTag)(JSVAL_TAG_MAX_DOUBLE | (type)))
#define JSVAL_TYPE_TO_SHIFTED_TAG(type) (((uint64)JSVAL_TYPE_TO_TAG(type)) << JSVAL_TAG_SHIFT)
#define JSVAL_LOWER_INCL_SHIFTED_TAG_OF_OBJ_OR_NULL_SET JSVAL_SHIFTED_TAG_NULL
#define JSVAL_UPPER_EXCL_SHIFTED_TAG_OF_PRIMITIVE_SET JSVAL_SHIFTED_TAG_OBJECT
#define JSVAL_UPPER_EXCL_SHIFTED_TAG_OF_NUMBER_SET JSVAL_SHIFTED_TAG_UNDEFINED
#define JSVAL_LOWER_INCL_SHIFTED_TAG_OF_PTR_PAYLOAD_SET JSVAL_SHIFTED_TAG_MAGIC
#define JSVAL_LOWER_INCL_SHIFTED_TAG_OF_GCTHING_SET JSVAL_SHIFTED_TAG_STRING
#endif /* JS_BITS_PER_WORD */
typedef enum JSWhyMagic
{
JS_ARRAY_HOLE, /* a hole in a dense array */
JS_ARGS_HOLE, /* a hole in the args object's array */
JS_NATIVE_ENUMERATE, /* indicates that a custom enumerate hook forwarded
* to js_Enumerate, which really means the object can be
* enumerated like a native object. */
JS_NO_ITER_VALUE, /* there is not a pending iterator value */
JS_GENERATOR_CLOSING, /* exception value thrown when closing a generator */
JS_NO_CONSTANT, /* compiler sentinel value */
JS_THIS_POISON, /* used in debug builds to catch tracing errors */
JS_ARG_POISON, /* used in debug builds to catch tracing errors */
JS_SERIALIZE_NO_NODE, /* an empty subnode in the AST serializer */
JS_GENERIC_MAGIC /* for local use */
} JSWhyMagic;
#ifdef __cplusplus
class JSString;
class JSFlatString;
#else
typedef struct JSString JSString;
typedef struct JSFlatString JSFlatString;
#endif
typedef struct JSObject JSObject;
#if defined(IS_LITTLE_ENDIAN)
# if JS_BITS_PER_WORD == 32
typedef union jsval_layout
{
uint64 asBits;
struct {
union {
int32 i32;
uint32 u32;
JSBool boo;
JSString *str;
JSObject *obj;
void *ptr;
JSWhyMagic why;
jsuword word;
} payload;
JSValueTag tag;
} s;
double asDouble;
void *asPtr;
} jsval_layout;
# elif JS_BITS_PER_WORD == 64
typedef union jsval_layout
{
uint64 asBits;
#if (!defined(_WIN64) && defined(__cplusplus))
/* MSVC does not pack these correctly :-( */
struct {
uint64 payload47 : 47;
JSValueTag tag : 17;
} debugView;
#endif
struct {
union {
int32 i32;
uint32 u32;
JSWhyMagic why;
} payload;
} s;
double asDouble;
void *asPtr;
} jsval_layout;
# endif /* JS_BITS_PER_WORD */
#else /* defined(IS_LITTLE_ENDIAN) */
# if JS_BITS_PER_WORD == 32
typedef union jsval_layout
{
uint64 asBits;
struct {
JSValueTag tag;
union {
int32 i32;
uint32 u32;
JSBool boo;
JSString *str;
JSObject *obj;
void *ptr;
JSWhyMagic why;
jsuword word;
} payload;
} s;
double asDouble;
void *asPtr;
} jsval_layout;
# elif JS_BITS_PER_WORD == 64
typedef union jsval_layout
{
uint64 asBits;
struct {
JSValueTag tag : 17;
uint64 payload47 : 47;
} debugView;
struct {
uint32 padding;
union {
int32 i32;
uint32 u32;
JSWhyMagic why;
} payload;
} s;
double asDouble;
void *asPtr;
} jsval_layout;
# endif /* JS_BITS_PER_WORD */
#endif /* defined(IS_LITTLE_ENDIAN) */
JS_STATIC_ASSERT(sizeof(jsval_layout) == 8);
#if JS_BITS_PER_WORD == 32
/*
* N.B. GCC, in some but not all cases, chooses to emit signed comparison of
* JSValueTag even though its underlying type has been forced to be uint32.
* Thus, all comparisons should explicitly cast operands to uint32.
*/
#define BUILD_JSVAL(tag, payload) \
((((uint64)(uint32)(tag)) << 32) | (uint32)(payload))
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_DOUBLE_IMPL(jsval_layout l)
{
return (uint32)l.s.tag <= (uint32)JSVAL_TAG_CLEAR;
}
static JS_ALWAYS_INLINE jsval_layout
DOUBLE_TO_JSVAL_IMPL(double d)
{
jsval_layout l;
l.asDouble = d;
JS_ASSERT(JSVAL_IS_DOUBLE_IMPL(l));
return l;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_INT32_IMPL(jsval_layout l)
{
return l.s.tag == JSVAL_TAG_INT32;
}
static JS_ALWAYS_INLINE int32
JSVAL_TO_INT32_IMPL(jsval_layout l)
{
return l.s.payload.i32;
}
static JS_ALWAYS_INLINE jsval_layout
INT32_TO_JSVAL_IMPL(int32 i)
{
jsval_layout l;
l.s.tag = JSVAL_TAG_INT32;
l.s.payload.i32 = i;
return l;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_NUMBER_IMPL(jsval_layout l)
{
JSValueTag tag = l.s.tag;
JS_ASSERT(tag != JSVAL_TAG_CLEAR);
return (uint32)tag <= (uint32)JSVAL_UPPER_INCL_TAG_OF_NUMBER_SET;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_UNDEFINED_IMPL(jsval_layout l)
{
return l.s.tag == JSVAL_TAG_UNDEFINED;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_STRING_IMPL(jsval_layout l)
{
return l.s.tag == JSVAL_TAG_STRING;
}
static JS_ALWAYS_INLINE jsval_layout
STRING_TO_JSVAL_IMPL(JSString *str)
{
jsval_layout l;
JS_ASSERT(str);
l.s.tag = JSVAL_TAG_STRING;
l.s.payload.str = str;
return l;
}
static JS_ALWAYS_INLINE JSString *
JSVAL_TO_STRING_IMPL(jsval_layout l)
{
return l.s.payload.str;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_BOOLEAN_IMPL(jsval_layout l)
{
return l.s.tag == JSVAL_TAG_BOOLEAN;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_TO_BOOLEAN_IMPL(jsval_layout l)
{
return l.s.payload.boo;
}
static JS_ALWAYS_INLINE jsval_layout
BOOLEAN_TO_JSVAL_IMPL(JSBool b)
{
jsval_layout l;
JS_ASSERT(b == JS_TRUE || b == JS_FALSE);
l.s.tag = JSVAL_TAG_BOOLEAN;
l.s.payload.boo = b;
return l;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_MAGIC_IMPL(jsval_layout l)
{
return l.s.tag == JSVAL_TAG_MAGIC;
}
static JS_ALWAYS_INLINE JSObject *
MAGIC_JSVAL_TO_OBJECT_OR_NULL_IMPL(jsval_layout l)
{
JS_ASSERT(JSVAL_IS_MAGIC_IMPL(l));
return l.s.payload.obj;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_OBJECT_IMPL(jsval_layout l)
{
return l.s.tag == JSVAL_TAG_OBJECT;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_PRIMITIVE_IMPL(jsval_layout l)
{
return (uint32)l.s.tag < (uint32)JSVAL_UPPER_EXCL_TAG_OF_PRIMITIVE_SET;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_OBJECT_OR_NULL_IMPL(jsval_layout l)
{
JS_ASSERT((uint32)l.s.tag <= (uint32)JSVAL_TAG_OBJECT);
return (uint32)l.s.tag >= (uint32)JSVAL_LOWER_INCL_TAG_OF_OBJ_OR_NULL_SET;
}
static JS_ALWAYS_INLINE JSObject *
JSVAL_TO_OBJECT_IMPL(jsval_layout l)
{
return l.s.payload.obj;
}
static JS_ALWAYS_INLINE jsval_layout
OBJECT_TO_JSVAL_IMPL(JSObject *obj)
{
jsval_layout l;
JS_ASSERT(obj);
l.s.tag = JSVAL_TAG_OBJECT;
l.s.payload.obj = obj;
return l;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_NULL_IMPL(jsval_layout l)
{
return l.s.tag == JSVAL_TAG_NULL;
}
static JS_ALWAYS_INLINE jsval_layout
PRIVATE_PTR_TO_JSVAL_IMPL(void *ptr)
{
jsval_layout l;
JS_ASSERT(((uint32)ptr & 1) == 0);
l.s.tag = (JSValueTag)0;
l.s.payload.ptr = ptr;
JS_ASSERT(JSVAL_IS_DOUBLE_IMPL(l));
return l;
}
static JS_ALWAYS_INLINE void *
JSVAL_TO_PRIVATE_PTR_IMPL(jsval_layout l)
{
return l.s.payload.ptr;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_GCTHING_IMPL(jsval_layout l)
{
/* gcc sometimes generates signed < without explicit casts. */
return (uint32)l.s.tag >= (uint32)JSVAL_LOWER_INCL_TAG_OF_GCTHING_SET;
}
static JS_ALWAYS_INLINE void *
JSVAL_TO_GCTHING_IMPL(jsval_layout l)
{
return l.s.payload.ptr;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_TRACEABLE_IMPL(jsval_layout l)
{
return l.s.tag == JSVAL_TAG_STRING || l.s.tag == JSVAL_TAG_OBJECT;
}
static JS_ALWAYS_INLINE uint32
JSVAL_TRACE_KIND_IMPL(jsval_layout l)
{
return (uint32)(JSBool)JSVAL_IS_STRING_IMPL(l);
}
#elif JS_BITS_PER_WORD == 64
#define BUILD_JSVAL(tag, payload) \
((((uint64)(uint32)(tag)) << JSVAL_TAG_SHIFT) | (payload))
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_DOUBLE_IMPL(jsval_layout l)
{
return l.asBits <= JSVAL_SHIFTED_TAG_MAX_DOUBLE;
}
static JS_ALWAYS_INLINE jsval_layout
DOUBLE_TO_JSVAL_IMPL(double d)
{
jsval_layout l;
l.asDouble = d;
JS_ASSERT(l.asBits <= JSVAL_SHIFTED_TAG_MAX_DOUBLE);
return l;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_INT32_IMPL(jsval_layout l)
{
return (uint32)(l.asBits >> JSVAL_TAG_SHIFT) == JSVAL_TAG_INT32;
}
static JS_ALWAYS_INLINE int32
JSVAL_TO_INT32_IMPL(jsval_layout l)
{
return (int32)l.asBits;
}
static JS_ALWAYS_INLINE jsval_layout
INT32_TO_JSVAL_IMPL(int32 i32)
{
jsval_layout l;
l.asBits = ((uint64)(uint32)i32) | JSVAL_SHIFTED_TAG_INT32;
return l;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_NUMBER_IMPL(jsval_layout l)
{
return l.asBits < JSVAL_UPPER_EXCL_SHIFTED_TAG_OF_NUMBER_SET;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_UNDEFINED_IMPL(jsval_layout l)
{
return l.asBits == JSVAL_SHIFTED_TAG_UNDEFINED;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_STRING_IMPL(jsval_layout l)
{
return (uint32)(l.asBits >> JSVAL_TAG_SHIFT) == JSVAL_TAG_STRING;
}
static JS_ALWAYS_INLINE jsval_layout
STRING_TO_JSVAL_IMPL(JSString *str)
{
jsval_layout l;
uint64 strBits = (uint64)str;
JS_ASSERT(str);
JS_ASSERT((strBits >> JSVAL_TAG_SHIFT) == 0);
l.asBits = strBits | JSVAL_SHIFTED_TAG_STRING;
return l;
}
static JS_ALWAYS_INLINE JSString *
JSVAL_TO_STRING_IMPL(jsval_layout l)
{
return (JSString *)(l.asBits & JSVAL_PAYLOAD_MASK);
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_BOOLEAN_IMPL(jsval_layout l)
{
return (uint32)(l.asBits >> JSVAL_TAG_SHIFT) == JSVAL_TAG_BOOLEAN;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_TO_BOOLEAN_IMPL(jsval_layout l)
{
return (JSBool)l.asBits;
}
static JS_ALWAYS_INLINE jsval_layout
BOOLEAN_TO_JSVAL_IMPL(JSBool b)
{
jsval_layout l;
JS_ASSERT(b == JS_TRUE || b == JS_FALSE);
l.asBits = ((uint64)(uint32)b) | JSVAL_SHIFTED_TAG_BOOLEAN;
return l;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_MAGIC_IMPL(jsval_layout l)
{
return (l.asBits >> JSVAL_TAG_SHIFT) == JSVAL_TAG_MAGIC;
}
static JS_ALWAYS_INLINE JSObject *
MAGIC_JSVAL_TO_OBJECT_OR_NULL_IMPL(jsval_layout l)
{
uint64 ptrBits = l.asBits & JSVAL_PAYLOAD_MASK;
JS_ASSERT(JSVAL_IS_MAGIC_IMPL(l));
JS_ASSERT((ptrBits >> JSVAL_TAG_SHIFT) == 0);
return (JSObject *)ptrBits;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_PRIMITIVE_IMPL(jsval_layout l)
{
return l.asBits < JSVAL_UPPER_EXCL_SHIFTED_TAG_OF_PRIMITIVE_SET;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_OBJECT_IMPL(jsval_layout l)
{
JS_ASSERT((l.asBits >> JSVAL_TAG_SHIFT) <= JSVAL_SHIFTED_TAG_OBJECT);
return l.asBits >= JSVAL_SHIFTED_TAG_OBJECT;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_OBJECT_OR_NULL_IMPL(jsval_layout l)
{
JS_ASSERT((l.asBits >> JSVAL_TAG_SHIFT) <= JSVAL_TAG_OBJECT);
return l.asBits >= JSVAL_LOWER_INCL_SHIFTED_TAG_OF_OBJ_OR_NULL_SET;
}
static JS_ALWAYS_INLINE JSObject *
JSVAL_TO_OBJECT_IMPL(jsval_layout l)
{
uint64 ptrBits = l.asBits & JSVAL_PAYLOAD_MASK;
JS_ASSERT((ptrBits & 0x7) == 0);
return (JSObject *)ptrBits;
}
static JS_ALWAYS_INLINE jsval_layout
OBJECT_TO_JSVAL_IMPL(JSObject *obj)
{
jsval_layout l;
uint64 objBits = (uint64)obj;
JS_ASSERT(obj);
JS_ASSERT((objBits >> JSVAL_TAG_SHIFT) == 0);
l.asBits = objBits | JSVAL_SHIFTED_TAG_OBJECT;
return l;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_NULL_IMPL(jsval_layout l)
{
return l.asBits == JSVAL_SHIFTED_TAG_NULL;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_GCTHING_IMPL(jsval_layout l)
{
return l.asBits >= JSVAL_LOWER_INCL_SHIFTED_TAG_OF_GCTHING_SET;
}
static JS_ALWAYS_INLINE void *
JSVAL_TO_GCTHING_IMPL(jsval_layout l)
{
uint64 ptrBits = l.asBits & JSVAL_PAYLOAD_MASK;
JS_ASSERT((ptrBits & 0x7) == 0);
return (void *)ptrBits;
}
static JS_ALWAYS_INLINE JSBool
JSVAL_IS_TRACEABLE_IMPL(jsval_layout l)
{
return JSVAL_IS_GCTHING_IMPL(l) && !JSVAL_IS_NULL_IMPL(l);
}
static JS_ALWAYS_INLINE uint32
JSVAL_TRACE_KIND_IMPL(jsval_layout l)
{
return (uint32)(JSBool)!(JSVAL_IS_OBJECT_IMPL(l));
}
static JS_ALWAYS_INLINE jsval_layout
PRIVATE_PTR_TO_JSVAL_IMPL(void *ptr)
{
jsval_layout l;
uint64 ptrBits = (uint64)ptr;
JS_ASSERT((ptrBits & 1) == 0);
l.asBits = ptrBits >> 1;
JS_ASSERT(JSVAL_IS_DOUBLE_IMPL(l));
return l;
}
static JS_ALWAYS_INLINE void *
JSVAL_TO_PRIVATE_PTR_IMPL(jsval_layout l)
{
JS_ASSERT((l.asBits & 0x8000000000000000LL) == 0);
return (void *)(l.asBits << 1);
}
#endif
static JS_ALWAYS_INLINE double
JS_CANONICALIZE_NAN(double d)
{
if (JS_UNLIKELY(d != d)) {
jsval_layout l;
l.asBits = 0x7FF8000000000000LL;
return l.asDouble;
}
return d;
}
/* See JS_USE_JSVAL_JSID_STRUCT_TYPES comment in jsapi.h. */
#if defined(DEBUG) && !defined(JS_NO_JSVAL_JSID_STRUCT_TYPES)
# define JS_USE_JSVAL_JSID_STRUCT_TYPES
#endif
#ifdef JS_USE_JSVAL_JSID_STRUCT_TYPES
typedef JSVAL_ALIGNMENT jsval_layout jsval;
typedef struct jsid { size_t asBits; } jsid;
#if defined(__cplusplus)
extern "C++"
{
static JS_ALWAYS_INLINE bool
operator==(jsid lhs, jsid rhs)
{
return lhs.asBits == rhs.asBits;
}
static JS_ALWAYS_INLINE bool
operator!=(jsid lhs, jsid rhs)
{
return lhs.asBits != rhs.asBits;
}
static JS_ALWAYS_INLINE bool
operator==(jsval lhs, jsval rhs)
{
return lhs.asBits == rhs.asBits;
}
static JS_ALWAYS_INLINE bool
operator!=(jsval lhs, jsval rhs)
{
return lhs.asBits != rhs.asBits;
}
}
# endif /* defined(__cplusplus) */
/* Internal helper macros */
#define JSVAL_BITS(v) ((v).asBits)
#define JSVAL_FROM_LAYOUT(l) (l)
#define IMPL_TO_JSVAL(v) (v)
#define JSID_BITS(id) ((id).asBits)
#else /* defined(JS_USE_JSVAL_JSID_STRUCT_TYPES) */
/* Use different primitive types so overloading works. */
typedef JSVAL_ALIGNMENT JSUint64 jsval;
typedef ptrdiff_t jsid;
/* Internal helper macros */
#define JSVAL_BITS(v) (v)
#define JSVAL_FROM_LAYOUT(l) ((l).asBits)
#define IMPL_TO_JSVAL(v) ((v).asBits)
#define JSID_BITS(id) (id)
#endif /* defined(JS_USE_JSVAL_JSID_STRUCT_TYPES) */
JS_END_EXTERN_C
#endif /* jsvalimpl_h__ */
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