зеркало из https://github.com/mozilla/gecko-dev.git
1956 строки
52 KiB
C++
1956 строки
52 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=8 sts=4 et sw=4 tw=99:
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* JS::Value implementation. */
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#ifndef js_Value_h
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#define js_Value_h
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#include "mozilla/Attributes.h"
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#include "mozilla/FloatingPoint.h"
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#include "mozilla/Likely.h"
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#include <limits> /* for std::numeric_limits */
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#include "js-config.h"
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#include "jstypes.h"
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#include "js/GCAPI.h"
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#include "js/RootingAPI.h"
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#include "js/Utility.h"
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namespace JS { class Value; }
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/* JS::Value can store a full int32_t. */
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#define JSVAL_INT_BITS 32
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#define JSVAL_INT_MIN ((int32_t)0x80000000)
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#define JSVAL_INT_MAX ((int32_t)0x7fffffff)
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/*
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* Try to get jsvals 64-bit aligned. We could almost assert that all values are
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* aligned, but MSVC and GCC occasionally break alignment.
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*/
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#if defined(__GNUC__) || defined(__xlc__) || defined(__xlC__)
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# define JSVAL_ALIGNMENT __attribute__((aligned (8)))
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#elif defined(_MSC_VER)
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/*
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* Structs can be aligned with MSVC, but not if they are used as parameters,
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* so we just don't try to align.
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*/
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# define JSVAL_ALIGNMENT
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#elif defined(__SUNPRO_C) || defined(__SUNPRO_CC)
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# define JSVAL_ALIGNMENT
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#elif defined(__HP_cc) || defined(__HP_aCC)
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# define JSVAL_ALIGNMENT
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#endif
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#if defined(JS_PUNBOX64)
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# define JSVAL_TAG_SHIFT 47
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#endif
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/*
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* We try to use enums so that printing a jsval_layout in the debugger shows
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* nice symbolic type tags, however we can only do this when we can force the
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* underlying type of the enum to be the desired size.
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*/
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#if !defined(__SUNPRO_CC) && !defined(__xlC__)
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#if defined(_MSC_VER)
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# define JS_ENUM_HEADER(id, type) enum id : type
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# define JS_ENUM_FOOTER(id)
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#else
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# define JS_ENUM_HEADER(id, type) enum id
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# define JS_ENUM_FOOTER(id) __attribute__((packed))
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#endif
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/* Remember to propagate changes to the C defines below. */
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JS_ENUM_HEADER(JSValueType, uint8_t)
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{
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JSVAL_TYPE_DOUBLE = 0x00,
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JSVAL_TYPE_INT32 = 0x01,
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JSVAL_TYPE_UNDEFINED = 0x02,
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JSVAL_TYPE_BOOLEAN = 0x03,
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JSVAL_TYPE_MAGIC = 0x04,
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JSVAL_TYPE_STRING = 0x05,
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JSVAL_TYPE_SYMBOL = 0x06,
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JSVAL_TYPE_NULL = 0x07,
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JSVAL_TYPE_OBJECT = 0x08,
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/* These never appear in a jsval; they are only provided as an out-of-band value. */
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JSVAL_TYPE_UNKNOWN = 0x20,
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JSVAL_TYPE_MISSING = 0x21
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} JS_ENUM_FOOTER(JSValueType);
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static_assert(sizeof(JSValueType) == 1,
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"compiler typed enum support is apparently buggy");
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#if defined(JS_NUNBOX32)
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/* Remember to propagate changes to the C defines below. */
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JS_ENUM_HEADER(JSValueTag, uint32_t)
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{
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JSVAL_TAG_CLEAR = 0xFFFFFF80,
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JSVAL_TAG_INT32 = JSVAL_TAG_CLEAR | JSVAL_TYPE_INT32,
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JSVAL_TAG_UNDEFINED = JSVAL_TAG_CLEAR | JSVAL_TYPE_UNDEFINED,
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JSVAL_TAG_STRING = JSVAL_TAG_CLEAR | JSVAL_TYPE_STRING,
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JSVAL_TAG_SYMBOL = JSVAL_TAG_CLEAR | JSVAL_TYPE_SYMBOL,
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JSVAL_TAG_BOOLEAN = JSVAL_TAG_CLEAR | JSVAL_TYPE_BOOLEAN,
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JSVAL_TAG_MAGIC = JSVAL_TAG_CLEAR | JSVAL_TYPE_MAGIC,
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JSVAL_TAG_NULL = JSVAL_TAG_CLEAR | JSVAL_TYPE_NULL,
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JSVAL_TAG_OBJECT = JSVAL_TAG_CLEAR | JSVAL_TYPE_OBJECT
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} JS_ENUM_FOOTER(JSValueTag);
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static_assert(sizeof(JSValueTag) == sizeof(uint32_t),
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"compiler typed enum support is apparently buggy");
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#elif defined(JS_PUNBOX64)
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/* Remember to propagate changes to the C defines below. */
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JS_ENUM_HEADER(JSValueTag, uint32_t)
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{
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JSVAL_TAG_MAX_DOUBLE = 0x1FFF0,
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JSVAL_TAG_INT32 = JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_INT32,
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JSVAL_TAG_UNDEFINED = JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_UNDEFINED,
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JSVAL_TAG_STRING = JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_STRING,
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JSVAL_TAG_SYMBOL = JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_SYMBOL,
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JSVAL_TAG_BOOLEAN = JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_BOOLEAN,
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JSVAL_TAG_MAGIC = JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_MAGIC,
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JSVAL_TAG_NULL = JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_NULL,
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JSVAL_TAG_OBJECT = JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_OBJECT
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} JS_ENUM_FOOTER(JSValueTag);
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static_assert(sizeof(JSValueTag) == sizeof(uint32_t),
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"compiler typed enum support is apparently buggy");
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JS_ENUM_HEADER(JSValueShiftedTag, uint64_t)
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{
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JSVAL_SHIFTED_TAG_MAX_DOUBLE = ((((uint64_t)JSVAL_TAG_MAX_DOUBLE) << JSVAL_TAG_SHIFT) | 0xFFFFFFFF),
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JSVAL_SHIFTED_TAG_INT32 = (((uint64_t)JSVAL_TAG_INT32) << JSVAL_TAG_SHIFT),
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JSVAL_SHIFTED_TAG_UNDEFINED = (((uint64_t)JSVAL_TAG_UNDEFINED) << JSVAL_TAG_SHIFT),
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JSVAL_SHIFTED_TAG_STRING = (((uint64_t)JSVAL_TAG_STRING) << JSVAL_TAG_SHIFT),
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JSVAL_SHIFTED_TAG_SYMBOL = (((uint64_t)JSVAL_TAG_SYMBOL) << JSVAL_TAG_SHIFT),
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JSVAL_SHIFTED_TAG_BOOLEAN = (((uint64_t)JSVAL_TAG_BOOLEAN) << JSVAL_TAG_SHIFT),
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JSVAL_SHIFTED_TAG_MAGIC = (((uint64_t)JSVAL_TAG_MAGIC) << JSVAL_TAG_SHIFT),
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JSVAL_SHIFTED_TAG_NULL = (((uint64_t)JSVAL_TAG_NULL) << JSVAL_TAG_SHIFT),
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JSVAL_SHIFTED_TAG_OBJECT = (((uint64_t)JSVAL_TAG_OBJECT) << JSVAL_TAG_SHIFT)
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} JS_ENUM_FOOTER(JSValueShiftedTag);
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static_assert(sizeof(JSValueShiftedTag) == sizeof(uint64_t),
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"compiler typed enum support is apparently buggy");
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#endif
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/*
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* All our supported compilers implement C++11 |enum Foo : T| syntax, so don't
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* expose these macros. (This macro exists *only* because gcc bug 51242
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* <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=51242> makes bit-fields of
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* typed enums trigger a warning that can't be turned off. Don't expose it
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* beyond this file!)
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*/
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#undef JS_ENUM_HEADER
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#undef JS_ENUM_FOOTER
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#else /* !defined(__SUNPRO_CC) && !defined(__xlC__) */
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typedef uint8_t JSValueType;
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#define JSVAL_TYPE_DOUBLE ((uint8_t)0x00)
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#define JSVAL_TYPE_INT32 ((uint8_t)0x01)
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#define JSVAL_TYPE_UNDEFINED ((uint8_t)0x02)
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#define JSVAL_TYPE_BOOLEAN ((uint8_t)0x03)
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#define JSVAL_TYPE_MAGIC ((uint8_t)0x04)
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#define JSVAL_TYPE_STRING ((uint8_t)0x05)
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#define JSVAL_TYPE_SYMBOL ((uint8_t)0x06)
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#define JSVAL_TYPE_NULL ((uint8_t)0x07)
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#define JSVAL_TYPE_OBJECT ((uint8_t)0x08)
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#define JSVAL_TYPE_UNKNOWN ((uint8_t)0x20)
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#if defined(JS_NUNBOX32)
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typedef uint32_t JSValueTag;
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#define JSVAL_TAG_CLEAR ((uint32_t)(0xFFFFFF80))
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#define JSVAL_TAG_INT32 ((uint32_t)(JSVAL_TAG_CLEAR | JSVAL_TYPE_INT32))
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#define JSVAL_TAG_UNDEFINED ((uint32_t)(JSVAL_TAG_CLEAR | JSVAL_TYPE_UNDEFINED))
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#define JSVAL_TAG_STRING ((uint32_t)(JSVAL_TAG_CLEAR | JSVAL_TYPE_STRING))
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#define JSVAL_TAG_SYMBOL ((uint32_t)(JSVAL_TAG_CLEAR | JSVAL_TYPE_SYMBOL))
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#define JSVAL_TAG_BOOLEAN ((uint32_t)(JSVAL_TAG_CLEAR | JSVAL_TYPE_BOOLEAN))
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#define JSVAL_TAG_MAGIC ((uint32_t)(JSVAL_TAG_CLEAR | JSVAL_TYPE_MAGIC))
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#define JSVAL_TAG_NULL ((uint32_t)(JSVAL_TAG_CLEAR | JSVAL_TYPE_NULL))
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#define JSVAL_TAG_OBJECT ((uint32_t)(JSVAL_TAG_CLEAR | JSVAL_TYPE_OBJECT))
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#elif defined(JS_PUNBOX64)
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typedef uint32_t JSValueTag;
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#define JSVAL_TAG_MAX_DOUBLE ((uint32_t)(0x1FFF0))
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#define JSVAL_TAG_INT32 (uint32_t)(JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_INT32)
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#define JSVAL_TAG_UNDEFINED (uint32_t)(JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_UNDEFINED)
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#define JSVAL_TAG_STRING (uint32_t)(JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_STRING)
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#define JSVAL_TAG_SYMBOL (uint32_t)(JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_SYMBOL)
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#define JSVAL_TAG_BOOLEAN (uint32_t)(JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_BOOLEAN)
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#define JSVAL_TAG_MAGIC (uint32_t)(JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_MAGIC)
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#define JSVAL_TAG_NULL (uint32_t)(JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_NULL)
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#define JSVAL_TAG_OBJECT (uint32_t)(JSVAL_TAG_MAX_DOUBLE | JSVAL_TYPE_OBJECT)
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typedef uint64_t JSValueShiftedTag;
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#define JSVAL_SHIFTED_TAG_MAX_DOUBLE ((((uint64_t)JSVAL_TAG_MAX_DOUBLE) << JSVAL_TAG_SHIFT) | 0xFFFFFFFF)
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#define JSVAL_SHIFTED_TAG_INT32 (((uint64_t)JSVAL_TAG_INT32) << JSVAL_TAG_SHIFT)
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#define JSVAL_SHIFTED_TAG_UNDEFINED (((uint64_t)JSVAL_TAG_UNDEFINED) << JSVAL_TAG_SHIFT)
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#define JSVAL_SHIFTED_TAG_STRING (((uint64_t)JSVAL_TAG_STRING) << JSVAL_TAG_SHIFT)
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#define JSVAL_SHIFTED_TAG_SYMBOL (((uint64_t)JSVAL_TAG_SYMBOL) << JSVAL_TAG_SHIFT)
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#define JSVAL_SHIFTED_TAG_BOOLEAN (((uint64_t)JSVAL_TAG_BOOLEAN) << JSVAL_TAG_SHIFT)
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#define JSVAL_SHIFTED_TAG_MAGIC (((uint64_t)JSVAL_TAG_MAGIC) << JSVAL_TAG_SHIFT)
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#define JSVAL_SHIFTED_TAG_NULL (((uint64_t)JSVAL_TAG_NULL) << JSVAL_TAG_SHIFT)
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#define JSVAL_SHIFTED_TAG_OBJECT (((uint64_t)JSVAL_TAG_OBJECT) << JSVAL_TAG_SHIFT)
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#endif /* JS_PUNBOX64 */
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#endif /* !defined(__SUNPRO_CC) && !defined(__xlC__) */
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#if defined(JS_NUNBOX32)
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#define JSVAL_TYPE_TO_TAG(type) ((JSValueTag)(JSVAL_TAG_CLEAR | (type)))
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#define JSVAL_LOWER_INCL_TAG_OF_OBJ_OR_NULL_SET JSVAL_TAG_NULL
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#define JSVAL_UPPER_EXCL_TAG_OF_PRIMITIVE_SET JSVAL_TAG_OBJECT
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#define JSVAL_UPPER_INCL_TAG_OF_NUMBER_SET JSVAL_TAG_INT32
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#define JSVAL_LOWER_INCL_TAG_OF_GCTHING_SET JSVAL_TAG_STRING
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#elif defined(JS_PUNBOX64)
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#define JSVAL_PAYLOAD_MASK 0x00007FFFFFFFFFFFLL
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#define JSVAL_TAG_MASK 0xFFFF800000000000LL
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#define JSVAL_TYPE_TO_TAG(type) ((JSValueTag)(JSVAL_TAG_MAX_DOUBLE | (type)))
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#define JSVAL_TYPE_TO_SHIFTED_TAG(type) (((uint64_t)JSVAL_TYPE_TO_TAG(type)) << JSVAL_TAG_SHIFT)
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#define JSVAL_LOWER_INCL_TAG_OF_OBJ_OR_NULL_SET JSVAL_TAG_NULL
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#define JSVAL_UPPER_EXCL_TAG_OF_PRIMITIVE_SET JSVAL_TAG_OBJECT
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#define JSVAL_UPPER_INCL_TAG_OF_NUMBER_SET JSVAL_TAG_INT32
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#define JSVAL_LOWER_INCL_TAG_OF_GCTHING_SET JSVAL_TAG_STRING
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#define JSVAL_LOWER_INCL_SHIFTED_TAG_OF_OBJ_OR_NULL_SET JSVAL_SHIFTED_TAG_NULL
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#define JSVAL_UPPER_EXCL_SHIFTED_TAG_OF_PRIMITIVE_SET JSVAL_SHIFTED_TAG_OBJECT
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#define JSVAL_UPPER_EXCL_SHIFTED_TAG_OF_NUMBER_SET JSVAL_SHIFTED_TAG_UNDEFINED
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#define JSVAL_LOWER_INCL_SHIFTED_TAG_OF_GCTHING_SET JSVAL_SHIFTED_TAG_STRING
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#endif /* JS_PUNBOX64 */
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typedef enum JSWhyMagic
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{
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/** a hole in a native object's elements */
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JS_ELEMENTS_HOLE,
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/** there is not a pending iterator value */
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JS_NO_ITER_VALUE,
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/** exception value thrown when closing a generator */
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JS_GENERATOR_CLOSING,
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/** compiler sentinel value */
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JS_NO_CONSTANT,
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/** used in debug builds to catch tracing errors */
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JS_THIS_POISON,
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/** used in debug builds to catch tracing errors */
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JS_ARG_POISON,
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/** an empty subnode in the AST serializer */
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JS_SERIALIZE_NO_NODE,
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/** lazy arguments value on the stack */
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JS_LAZY_ARGUMENTS,
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/** optimized-away 'arguments' value */
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JS_OPTIMIZED_ARGUMENTS,
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/** magic value passed to natives to indicate construction */
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JS_IS_CONSTRUCTING,
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/** arguments.callee has been overwritten */
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JS_OVERWRITTEN_CALLEE,
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/** value of static block object slot */
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JS_BLOCK_NEEDS_CLONE,
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/** see class js::HashableValue */
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JS_HASH_KEY_EMPTY,
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/** error while running Ion code */
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JS_ION_ERROR,
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/** missing recover instruction result */
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JS_ION_BAILOUT,
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/** optimized out slot */
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JS_OPTIMIZED_OUT,
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/** uninitialized lexical bindings that produce ReferenceError on touch. */
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JS_UNINITIALIZED_LEXICAL,
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/** for local use */
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JS_GENERIC_MAGIC,
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JS_WHY_MAGIC_COUNT
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} JSWhyMagic;
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#if defined(IS_LITTLE_ENDIAN)
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# if defined(JS_NUNBOX32)
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typedef union jsval_layout
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{
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uint64_t asBits;
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struct {
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union {
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int32_t i32;
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uint32_t u32;
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uint32_t boo; // Don't use |bool| -- it must be four bytes.
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JSString* str;
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JS::Symbol* sym;
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JSObject* obj;
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js::gc::Cell* cell;
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void* ptr;
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JSWhyMagic why;
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size_t word;
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uintptr_t uintptr;
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} payload;
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JSValueTag tag;
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} s;
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double asDouble;
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void* asPtr;
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} JSVAL_ALIGNMENT jsval_layout;
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# elif defined(JS_PUNBOX64)
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typedef union jsval_layout
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{
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uint64_t asBits;
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#if !defined(_WIN64)
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/* MSVC does not pack these correctly :-( */
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struct {
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uint64_t payload47 : 47;
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JSValueTag tag : 17;
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} debugView;
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#endif
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struct {
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union {
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int32_t i32;
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uint32_t u32;
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JSWhyMagic why;
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} payload;
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} s;
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double asDouble;
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void* asPtr;
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size_t asWord;
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uintptr_t asUIntPtr;
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} JSVAL_ALIGNMENT jsval_layout;
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# endif /* JS_PUNBOX64 */
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#else /* defined(IS_LITTLE_ENDIAN) */
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# if defined(JS_NUNBOX32)
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typedef union jsval_layout
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{
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uint64_t asBits;
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struct {
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JSValueTag tag;
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union {
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int32_t i32;
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uint32_t u32;
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uint32_t boo; // Don't use |bool| -- it must be four bytes.
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JSString* str;
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JS::Symbol* sym;
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JSObject* obj;
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js::gc::Cell* cell;
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void* ptr;
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JSWhyMagic why;
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size_t word;
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uintptr_t uintptr;
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} payload;
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} s;
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double asDouble;
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void* asPtr;
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} JSVAL_ALIGNMENT jsval_layout;
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# elif defined(JS_PUNBOX64)
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typedef union jsval_layout
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{
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uint64_t asBits;
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struct {
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JSValueTag tag : 17;
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uint64_t payload47 : 47;
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} debugView;
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struct {
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uint32_t padding;
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union {
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int32_t i32;
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uint32_t u32;
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JSWhyMagic why;
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} payload;
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} s;
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double asDouble;
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void* asPtr;
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size_t asWord;
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uintptr_t asUIntPtr;
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} JSVAL_ALIGNMENT jsval_layout;
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# endif /* JS_PUNBOX64 */
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#endif /* defined(IS_LITTLE_ENDIAN) */
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JS_STATIC_ASSERT(sizeof(jsval_layout) == 8);
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/*
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* For codesize purposes on some platforms, it's important that the
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* compiler know that JS::Values constructed from constant values can be
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* folded to constant bit patterns at compile time, rather than
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* constructed at runtime. Doing this requires a fair amount of C++11
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* features, which are not supported on all of our compilers. Set up
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* some defines and helper macros in an attempt to confine the ugliness
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* here, rather than scattering it all about the file. The important
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* features are:
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*
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* - constexpr;
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* - defaulted functions;
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* - C99-style designated initializers.
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*/
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#if defined(__clang__)
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# if __has_feature(cxx_constexpr) && __has_feature(cxx_defaulted_functions)
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# define JS_VALUE_IS_CONSTEXPR
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# endif
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#elif defined(__GNUC__)
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/*
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* We need 4.5 for defaulted functions, 4.6 for constexpr, 4.7 because 4.6
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* doesn't understand |(X) { .field = ... }| syntax, and 4.7.3 because
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* versions prior to that have bugs in the C++ front-end that cause crashes.
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*/
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# if MOZ_GCC_VERSION_AT_LEAST(4, 7, 3)
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# define JS_VALUE_IS_CONSTEXPR
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# endif
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#endif
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#if defined(JS_VALUE_IS_CONSTEXPR)
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# define JS_RETURN_LAYOUT_FROM_BITS(BITS) \
|
|
return (jsval_layout) { .asBits = (BITS) }
|
|
# define JS_VALUE_CONSTEXPR MOZ_CONSTEXPR
|
|
# define JS_VALUE_CONSTEXPR_VAR MOZ_CONSTEXPR_VAR
|
|
#else
|
|
# define JS_RETURN_LAYOUT_FROM_BITS(BITS) \
|
|
jsval_layout l; \
|
|
l.asBits = (BITS); \
|
|
return l;
|
|
# define JS_VALUE_CONSTEXPR
|
|
# define JS_VALUE_CONSTEXPR_VAR const
|
|
#endif
|
|
|
|
#if defined(JS_NUNBOX32)
|
|
|
|
/*
|
|
* 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_t.
|
|
* Thus, all comparisons should explicitly cast operands to uint32_t.
|
|
*/
|
|
|
|
static inline JS_VALUE_CONSTEXPR jsval_layout
|
|
BUILD_JSVAL(JSValueTag tag, uint32_t payload)
|
|
{
|
|
JS_RETURN_LAYOUT_FROM_BITS((((uint64_t)(uint32_t)tag) << 32) | payload);
|
|
}
|
|
|
|
static inline bool
|
|
JSVAL_IS_DOUBLE_IMPL(jsval_layout l)
|
|
{
|
|
return (uint32_t)l.s.tag <= (uint32_t)JSVAL_TAG_CLEAR;
|
|
}
|
|
|
|
static inline jsval_layout
|
|
DOUBLE_TO_JSVAL_IMPL(double d)
|
|
{
|
|
jsval_layout l;
|
|
l.asDouble = d;
|
|
MOZ_ASSERT(JSVAL_IS_DOUBLE_IMPL(l));
|
|
return l;
|
|
}
|
|
|
|
static inline bool
|
|
JSVAL_IS_INT32_IMPL(jsval_layout l)
|
|
{
|
|
return l.s.tag == JSVAL_TAG_INT32;
|
|
}
|
|
|
|
static inline int32_t
|
|
JSVAL_TO_INT32_IMPL(jsval_layout l)
|
|
{
|
|
return l.s.payload.i32;
|
|
}
|
|
|
|
static inline JS_VALUE_CONSTEXPR jsval_layout
|
|
INT32_TO_JSVAL_IMPL(int32_t i)
|
|
{
|
|
#if defined(JS_VALUE_IS_CONSTEXPR)
|
|
return BUILD_JSVAL(JSVAL_TAG_INT32, i);
|
|
#else
|
|
jsval_layout l;
|
|
l.s.tag = JSVAL_TAG_INT32;
|
|
l.s.payload.i32 = i;
|
|
return l;
|
|
#endif
|
|
}
|
|
|
|
static inline bool
|
|
JSVAL_IS_NUMBER_IMPL(jsval_layout l)
|
|
{
|
|
JSValueTag tag = l.s.tag;
|
|
MOZ_ASSERT(tag != JSVAL_TAG_CLEAR);
|
|
return (uint32_t)tag <= (uint32_t)JSVAL_UPPER_INCL_TAG_OF_NUMBER_SET;
|
|
}
|
|
|
|
static inline bool
|
|
JSVAL_IS_UNDEFINED_IMPL(jsval_layout l)
|
|
{
|
|
return l.s.tag == JSVAL_TAG_UNDEFINED;
|
|
}
|
|
|
|
static inline bool
|
|
JSVAL_IS_STRING_IMPL(jsval_layout l)
|
|
{
|
|
return l.s.tag == JSVAL_TAG_STRING;
|
|
}
|
|
|
|
static inline jsval_layout
|
|
STRING_TO_JSVAL_IMPL(JSString* str)
|
|
{
|
|
jsval_layout l;
|
|
MOZ_ASSERT(uintptr_t(str) > 0x1000);
|
|
l.s.tag = JSVAL_TAG_STRING;
|
|
l.s.payload.str = str;
|
|
return l;
|
|
}
|
|
|
|
static inline JSString*
|
|
JSVAL_TO_STRING_IMPL(jsval_layout l)
|
|
{
|
|
return l.s.payload.str;
|
|
}
|
|
|
|
static inline bool
|
|
JSVAL_IS_SYMBOL_IMPL(jsval_layout l)
|
|
{
|
|
return l.s.tag == JSVAL_TAG_SYMBOL;
|
|
}
|
|
|
|
static inline jsval_layout
|
|
SYMBOL_TO_JSVAL_IMPL(JS::Symbol* sym)
|
|
{
|
|
jsval_layout l;
|
|
MOZ_ASSERT(uintptr_t(sym) > 0x1000);
|
|
l.s.tag = JSVAL_TAG_SYMBOL;
|
|
l.s.payload.sym = sym;
|
|
return l;
|
|
}
|
|
|
|
static inline JS::Symbol*
|
|
JSVAL_TO_SYMBOL_IMPL(jsval_layout l)
|
|
{
|
|
return l.s.payload.sym;
|
|
}
|
|
|
|
static inline bool
|
|
JSVAL_IS_BOOLEAN_IMPL(jsval_layout l)
|
|
{
|
|
return l.s.tag == JSVAL_TAG_BOOLEAN;
|
|
}
|
|
|
|
static inline bool
|
|
JSVAL_TO_BOOLEAN_IMPL(jsval_layout l)
|
|
{
|
|
return l.s.payload.boo;
|
|
}
|
|
|
|
static inline jsval_layout
|
|
BOOLEAN_TO_JSVAL_IMPL(bool b)
|
|
{
|
|
jsval_layout l;
|
|
l.s.tag = JSVAL_TAG_BOOLEAN;
|
|
l.s.payload.boo = b;
|
|
return l;
|
|
}
|
|
|
|
static inline bool
|
|
JSVAL_IS_MAGIC_IMPL(jsval_layout l)
|
|
{
|
|
return l.s.tag == JSVAL_TAG_MAGIC;
|
|
}
|
|
|
|
static inline bool
|
|
JSVAL_IS_OBJECT_IMPL(jsval_layout l)
|
|
{
|
|
return l.s.tag == JSVAL_TAG_OBJECT;
|
|
}
|
|
|
|
static inline bool
|
|
JSVAL_IS_PRIMITIVE_IMPL(jsval_layout l)
|
|
{
|
|
return (uint32_t)l.s.tag < (uint32_t)JSVAL_UPPER_EXCL_TAG_OF_PRIMITIVE_SET;
|
|
}
|
|
|
|
static inline bool
|
|
JSVAL_IS_OBJECT_OR_NULL_IMPL(jsval_layout l)
|
|
{
|
|
MOZ_ASSERT((uint32_t)l.s.tag <= (uint32_t)JSVAL_TAG_OBJECT);
|
|
return (uint32_t)l.s.tag >= (uint32_t)JSVAL_LOWER_INCL_TAG_OF_OBJ_OR_NULL_SET;
|
|
}
|
|
|
|
static inline JSObject*
|
|
JSVAL_TO_OBJECT_IMPL(jsval_layout l)
|
|
{
|
|
return l.s.payload.obj;
|
|
}
|
|
|
|
static inline jsval_layout
|
|
OBJECT_TO_JSVAL_IMPL(JSObject* obj)
|
|
{
|
|
jsval_layout l;
|
|
MOZ_ASSERT(uintptr_t(obj) > 0x1000 || uintptr_t(obj) == 0x42);
|
|
l.s.tag = JSVAL_TAG_OBJECT;
|
|
l.s.payload.obj = obj;
|
|
return l;
|
|
}
|
|
|
|
static inline bool
|
|
JSVAL_IS_NULL_IMPL(jsval_layout l)
|
|
{
|
|
return l.s.tag == JSVAL_TAG_NULL;
|
|
}
|
|
|
|
static inline jsval_layout
|
|
PRIVATE_PTR_TO_JSVAL_IMPL(void* ptr)
|
|
{
|
|
jsval_layout l;
|
|
MOZ_ASSERT(((uint32_t)ptr & 1) == 0);
|
|
l.s.tag = (JSValueTag)0;
|
|
l.s.payload.ptr = ptr;
|
|
MOZ_ASSERT(JSVAL_IS_DOUBLE_IMPL(l));
|
|
return l;
|
|
}
|
|
|
|
static inline void*
|
|
JSVAL_TO_PRIVATE_PTR_IMPL(jsval_layout l)
|
|
{
|
|
return l.s.payload.ptr;
|
|
}
|
|
|
|
static inline bool
|
|
JSVAL_IS_GCTHING_IMPL(jsval_layout l)
|
|
{
|
|
/* gcc sometimes generates signed < without explicit casts. */
|
|
return (uint32_t)l.s.tag >= (uint32_t)JSVAL_LOWER_INCL_TAG_OF_GCTHING_SET;
|
|
}
|
|
|
|
static inline js::gc::Cell*
|
|
JSVAL_TO_GCTHING_IMPL(jsval_layout l)
|
|
{
|
|
return l.s.payload.cell;
|
|
}
|
|
|
|
static inline uint32_t
|
|
JSVAL_TRACE_KIND_IMPL(jsval_layout l)
|
|
{
|
|
static_assert((JSVAL_TAG_STRING & 0x03) == size_t(JS::TraceKind::String),
|
|
"Value type tags must correspond with JS::TraceKinds.");
|
|
static_assert((JSVAL_TAG_SYMBOL & 0x03) == size_t(JS::TraceKind::Symbol),
|
|
"Value type tags must correspond with JS::TraceKinds.");
|
|
static_assert((JSVAL_TAG_OBJECT & 0x03) == size_t(JS::TraceKind::Object),
|
|
"Value type tags must correspond with JS::TraceKinds.");
|
|
return l.s.tag & 0x03;
|
|
}
|
|
|
|
static inline bool
|
|
JSVAL_IS_SPECIFIC_INT32_IMPL(jsval_layout l, int32_t i32)
|
|
{
|
|
return l.s.tag == JSVAL_TAG_INT32 && l.s.payload.i32 == i32;
|
|
}
|
|
|
|
static inline bool
|
|
JSVAL_IS_SPECIFIC_BOOLEAN_IMPL(jsval_layout l, bool b)
|
|
{
|
|
return (l.s.tag == JSVAL_TAG_BOOLEAN) && (l.s.payload.boo == uint32_t(b));
|
|
}
|
|
|
|
static inline jsval_layout
|
|
MAGIC_TO_JSVAL_IMPL(JSWhyMagic why)
|
|
{
|
|
jsval_layout l;
|
|
l.s.tag = JSVAL_TAG_MAGIC;
|
|
l.s.payload.why = why;
|
|
return l;
|
|
}
|
|
|
|
static inline jsval_layout
|
|
MAGIC_UINT32_TO_JSVAL_IMPL(uint32_t payload)
|
|
{
|
|
jsval_layout l;
|
|
l.s.tag = JSVAL_TAG_MAGIC;
|
|
l.s.payload.u32 = payload;
|
|
return l;
|
|
}
|
|
|
|
static inline bool
|
|
JSVAL_SAME_TYPE_IMPL(jsval_layout lhs, jsval_layout rhs)
|
|
{
|
|
JSValueTag ltag = lhs.s.tag, rtag = rhs.s.tag;
|
|
return ltag == rtag || (ltag < JSVAL_TAG_CLEAR && rtag < JSVAL_TAG_CLEAR);
|
|
}
|
|
|
|
static inline JSValueType
|
|
JSVAL_EXTRACT_NON_DOUBLE_TYPE_IMPL(jsval_layout l)
|
|
{
|
|
uint32_t type = l.s.tag & 0xF;
|
|
MOZ_ASSERT(type > JSVAL_TYPE_DOUBLE);
|
|
return (JSValueType)type;
|
|
}
|
|
|
|
#elif defined(JS_PUNBOX64)
|
|
|
|
static inline JS_VALUE_CONSTEXPR jsval_layout
|
|
BUILD_JSVAL(JSValueTag tag, uint64_t payload)
|
|
{
|
|
JS_RETURN_LAYOUT_FROM_BITS((((uint64_t)(uint32_t)tag) << JSVAL_TAG_SHIFT) | payload);
|
|
}
|
|
|
|
static inline bool
|
|
JSVAL_IS_DOUBLE_IMPL(jsval_layout l)
|
|
{
|
|
return l.asBits <= JSVAL_SHIFTED_TAG_MAX_DOUBLE;
|
|
}
|
|
|
|
static inline jsval_layout
|
|
DOUBLE_TO_JSVAL_IMPL(double d)
|
|
{
|
|
jsval_layout l;
|
|
l.asDouble = d;
|
|
MOZ_ASSERT(l.asBits <= JSVAL_SHIFTED_TAG_MAX_DOUBLE);
|
|
return l;
|
|
}
|
|
|
|
static inline bool
|
|
JSVAL_IS_INT32_IMPL(jsval_layout l)
|
|
{
|
|
return (uint32_t)(l.asBits >> JSVAL_TAG_SHIFT) == JSVAL_TAG_INT32;
|
|
}
|
|
|
|
static inline int32_t
|
|
JSVAL_TO_INT32_IMPL(jsval_layout l)
|
|
{
|
|
return (int32_t)l.asBits;
|
|
}
|
|
|
|
static inline JS_VALUE_CONSTEXPR jsval_layout
|
|
INT32_TO_JSVAL_IMPL(int32_t i32)
|
|
{
|
|
JS_RETURN_LAYOUT_FROM_BITS(((uint64_t)(uint32_t)i32) | JSVAL_SHIFTED_TAG_INT32);
|
|
}
|
|
|
|
static inline bool
|
|
JSVAL_IS_NUMBER_IMPL(jsval_layout l)
|
|
{
|
|
return l.asBits < JSVAL_UPPER_EXCL_SHIFTED_TAG_OF_NUMBER_SET;
|
|
}
|
|
|
|
static inline bool
|
|
JSVAL_IS_UNDEFINED_IMPL(jsval_layout l)
|
|
{
|
|
return l.asBits == JSVAL_SHIFTED_TAG_UNDEFINED;
|
|
}
|
|
|
|
static inline bool
|
|
JSVAL_IS_STRING_IMPL(jsval_layout l)
|
|
{
|
|
return (uint32_t)(l.asBits >> JSVAL_TAG_SHIFT) == JSVAL_TAG_STRING;
|
|
}
|
|
|
|
static inline jsval_layout
|
|
STRING_TO_JSVAL_IMPL(JSString* str)
|
|
{
|
|
jsval_layout l;
|
|
uint64_t strBits = (uint64_t)str;
|
|
MOZ_ASSERT(uintptr_t(str) > 0x1000);
|
|
MOZ_ASSERT((strBits >> JSVAL_TAG_SHIFT) == 0);
|
|
l.asBits = strBits | JSVAL_SHIFTED_TAG_STRING;
|
|
return l;
|
|
}
|
|
|
|
static inline JSString*
|
|
JSVAL_TO_STRING_IMPL(jsval_layout l)
|
|
{
|
|
return (JSString*)(l.asBits & JSVAL_PAYLOAD_MASK);
|
|
}
|
|
|
|
static inline bool
|
|
JSVAL_IS_SYMBOL_IMPL(jsval_layout l)
|
|
{
|
|
return (uint32_t)(l.asBits >> JSVAL_TAG_SHIFT) == JSVAL_TAG_SYMBOL;
|
|
}
|
|
|
|
static inline jsval_layout
|
|
SYMBOL_TO_JSVAL_IMPL(JS::Symbol* sym)
|
|
{
|
|
jsval_layout l;
|
|
uint64_t symBits = (uint64_t)sym;
|
|
MOZ_ASSERT(uintptr_t(sym) > 0x1000);
|
|
MOZ_ASSERT((symBits >> JSVAL_TAG_SHIFT) == 0);
|
|
l.asBits = symBits | JSVAL_SHIFTED_TAG_SYMBOL;
|
|
return l;
|
|
}
|
|
|
|
static inline JS::Symbol*
|
|
JSVAL_TO_SYMBOL_IMPL(jsval_layout l)
|
|
{
|
|
return (JS::Symbol*)(l.asBits & JSVAL_PAYLOAD_MASK);
|
|
}
|
|
|
|
static inline bool
|
|
JSVAL_IS_BOOLEAN_IMPL(jsval_layout l)
|
|
{
|
|
return (uint32_t)(l.asBits >> JSVAL_TAG_SHIFT) == JSVAL_TAG_BOOLEAN;
|
|
}
|
|
|
|
static inline bool
|
|
JSVAL_TO_BOOLEAN_IMPL(jsval_layout l)
|
|
{
|
|
return (bool)(l.asBits & JSVAL_PAYLOAD_MASK);
|
|
}
|
|
|
|
static inline jsval_layout
|
|
BOOLEAN_TO_JSVAL_IMPL(bool b)
|
|
{
|
|
jsval_layout l;
|
|
l.asBits = ((uint64_t)(uint32_t)b) | JSVAL_SHIFTED_TAG_BOOLEAN;
|
|
return l;
|
|
}
|
|
|
|
static inline bool
|
|
JSVAL_IS_MAGIC_IMPL(jsval_layout l)
|
|
{
|
|
return (l.asBits >> JSVAL_TAG_SHIFT) == JSVAL_TAG_MAGIC;
|
|
}
|
|
|
|
static inline bool
|
|
JSVAL_IS_PRIMITIVE_IMPL(jsval_layout l)
|
|
{
|
|
return l.asBits < JSVAL_UPPER_EXCL_SHIFTED_TAG_OF_PRIMITIVE_SET;
|
|
}
|
|
|
|
static inline bool
|
|
JSVAL_IS_OBJECT_IMPL(jsval_layout l)
|
|
{
|
|
MOZ_ASSERT((l.asBits >> JSVAL_TAG_SHIFT) <= JSVAL_TAG_OBJECT);
|
|
return l.asBits >= JSVAL_SHIFTED_TAG_OBJECT;
|
|
}
|
|
|
|
static inline bool
|
|
JSVAL_IS_OBJECT_OR_NULL_IMPL(jsval_layout l)
|
|
{
|
|
MOZ_ASSERT((l.asBits >> JSVAL_TAG_SHIFT) <= JSVAL_TAG_OBJECT);
|
|
return l.asBits >= JSVAL_LOWER_INCL_SHIFTED_TAG_OF_OBJ_OR_NULL_SET;
|
|
}
|
|
|
|
static inline JSObject*
|
|
JSVAL_TO_OBJECT_IMPL(jsval_layout l)
|
|
{
|
|
uint64_t ptrBits = l.asBits & JSVAL_PAYLOAD_MASK;
|
|
MOZ_ASSERT((ptrBits & 0x7) == 0);
|
|
return (JSObject*)ptrBits;
|
|
}
|
|
|
|
static inline jsval_layout
|
|
OBJECT_TO_JSVAL_IMPL(JSObject* obj)
|
|
{
|
|
jsval_layout l;
|
|
uint64_t objBits = (uint64_t)obj;
|
|
MOZ_ASSERT(uintptr_t(obj) > 0x1000 || uintptr_t(obj) == 0x42);
|
|
MOZ_ASSERT((objBits >> JSVAL_TAG_SHIFT) == 0);
|
|
l.asBits = objBits | JSVAL_SHIFTED_TAG_OBJECT;
|
|
return l;
|
|
}
|
|
|
|
static inline bool
|
|
JSVAL_IS_NULL_IMPL(jsval_layout l)
|
|
{
|
|
return l.asBits == JSVAL_SHIFTED_TAG_NULL;
|
|
}
|
|
|
|
static inline bool
|
|
JSVAL_IS_GCTHING_IMPL(jsval_layout l)
|
|
{
|
|
return l.asBits >= JSVAL_LOWER_INCL_SHIFTED_TAG_OF_GCTHING_SET;
|
|
}
|
|
|
|
static inline js::gc::Cell*
|
|
JSVAL_TO_GCTHING_IMPL(jsval_layout l)
|
|
{
|
|
uint64_t ptrBits = l.asBits & JSVAL_PAYLOAD_MASK;
|
|
MOZ_ASSERT((ptrBits & 0x7) == 0);
|
|
return reinterpret_cast<js::gc::Cell*>(ptrBits);
|
|
}
|
|
|
|
static inline uint32_t
|
|
JSVAL_TRACE_KIND_IMPL(jsval_layout l)
|
|
{
|
|
static_assert((JSVAL_TAG_STRING & 0x03) == size_t(JS::TraceKind::String),
|
|
"Value type tags must correspond with JS::TraceKinds.");
|
|
static_assert((JSVAL_TAG_SYMBOL & 0x03) == size_t(JS::TraceKind::Symbol),
|
|
"Value type tags must correspond with JS::TraceKinds.");
|
|
static_assert((JSVAL_TAG_OBJECT & 0x03) == size_t(JS::TraceKind::Object),
|
|
"Value type tags must correspond with JS::TraceKinds.");
|
|
return (uint32_t)(l.asBits >> JSVAL_TAG_SHIFT) & 0x03;
|
|
}
|
|
|
|
static inline jsval_layout
|
|
PRIVATE_PTR_TO_JSVAL_IMPL(void* ptr)
|
|
{
|
|
jsval_layout l;
|
|
uint64_t ptrBits = (uint64_t)ptr;
|
|
MOZ_ASSERT((ptrBits & 1) == 0);
|
|
l.asBits = ptrBits >> 1;
|
|
MOZ_ASSERT(JSVAL_IS_DOUBLE_IMPL(l));
|
|
return l;
|
|
}
|
|
|
|
static inline void*
|
|
JSVAL_TO_PRIVATE_PTR_IMPL(jsval_layout l)
|
|
{
|
|
MOZ_ASSERT((l.asBits & 0x8000000000000000LL) == 0);
|
|
return (void*)(l.asBits << 1);
|
|
}
|
|
|
|
static inline bool
|
|
JSVAL_IS_SPECIFIC_INT32_IMPL(jsval_layout l, int32_t i32)
|
|
{
|
|
return l.asBits == (((uint64_t)(uint32_t)i32) | JSVAL_SHIFTED_TAG_INT32);
|
|
}
|
|
|
|
static inline bool
|
|
JSVAL_IS_SPECIFIC_BOOLEAN_IMPL(jsval_layout l, bool b)
|
|
{
|
|
return l.asBits == (((uint64_t)(uint32_t)b) | JSVAL_SHIFTED_TAG_BOOLEAN);
|
|
}
|
|
|
|
static inline jsval_layout
|
|
MAGIC_TO_JSVAL_IMPL(JSWhyMagic why)
|
|
{
|
|
jsval_layout l;
|
|
l.asBits = ((uint64_t)(uint32_t)why) | JSVAL_SHIFTED_TAG_MAGIC;
|
|
return l;
|
|
}
|
|
|
|
static inline jsval_layout
|
|
MAGIC_UINT32_TO_JSVAL_IMPL(uint32_t payload)
|
|
{
|
|
jsval_layout l;
|
|
l.asBits = ((uint64_t)payload) | JSVAL_SHIFTED_TAG_MAGIC;
|
|
return l;
|
|
}
|
|
|
|
static inline bool
|
|
JSVAL_SAME_TYPE_IMPL(jsval_layout lhs, jsval_layout rhs)
|
|
{
|
|
uint64_t lbits = lhs.asBits, rbits = rhs.asBits;
|
|
return (lbits <= JSVAL_SHIFTED_TAG_MAX_DOUBLE && rbits <= JSVAL_SHIFTED_TAG_MAX_DOUBLE) ||
|
|
(((lbits ^ rbits) & 0xFFFF800000000000LL) == 0);
|
|
}
|
|
|
|
static inline JSValueType
|
|
JSVAL_EXTRACT_NON_DOUBLE_TYPE_IMPL(jsval_layout l)
|
|
{
|
|
uint64_t type = (l.asBits >> JSVAL_TAG_SHIFT) & 0xF;
|
|
MOZ_ASSERT(type > JSVAL_TYPE_DOUBLE);
|
|
return (JSValueType)type;
|
|
}
|
|
|
|
#endif /* JS_PUNBOX64 */
|
|
|
|
static inline bool
|
|
JSVAL_IS_TRACEABLE_IMPL(jsval_layout l)
|
|
{
|
|
return JSVAL_IS_GCTHING_IMPL(l) && !JSVAL_IS_NULL_IMPL(l);
|
|
}
|
|
|
|
static inline jsval_layout JSVAL_TO_IMPL(JS::Value v);
|
|
static inline JS_VALUE_CONSTEXPR JS::Value IMPL_TO_JSVAL(jsval_layout l);
|
|
|
|
namespace JS {
|
|
|
|
static inline JS_VALUE_CONSTEXPR JS::Value UndefinedValue();
|
|
|
|
/**
|
|
* Returns a generic quiet NaN value, with all payload bits set to zero.
|
|
*
|
|
* Among other properties, this NaN's bit pattern conforms to JS::Value's
|
|
* bit pattern restrictions.
|
|
*/
|
|
static MOZ_ALWAYS_INLINE double
|
|
GenericNaN()
|
|
{
|
|
return mozilla::SpecificNaN<double>(0, 0x8000000000000ULL);
|
|
}
|
|
|
|
/* MSVC with PGO miscompiles this function. */
|
|
#if defined(_MSC_VER)
|
|
# pragma optimize("g", off)
|
|
#endif
|
|
static inline double
|
|
CanonicalizeNaN(double d)
|
|
{
|
|
if (MOZ_UNLIKELY(mozilla::IsNaN(d)))
|
|
return GenericNaN();
|
|
return d;
|
|
}
|
|
#if defined(_MSC_VER)
|
|
# pragma optimize("", on)
|
|
#endif
|
|
|
|
/**
|
|
* JS::Value is the interface for a single JavaScript Engine value. A few
|
|
* general notes on JS::Value:
|
|
*
|
|
* - JS::Value has setX() and isX() members for X in
|
|
*
|
|
* { Int32, Double, String, Symbol, Boolean, Undefined, Null, Object, Magic }
|
|
*
|
|
* JS::Value also contains toX() for each of the non-singleton types.
|
|
*
|
|
* - Magic is a singleton type whose payload contains either a JSWhyMagic "reason" for
|
|
* the magic value or a uint32_t value. By providing JSWhyMagic values when
|
|
* creating and checking for magic values, it is possible to assert, at
|
|
* runtime, that only magic values with the expected reason flow through a
|
|
* particular value. For example, if cx->exception has a magic value, the
|
|
* reason must be JS_GENERATOR_CLOSING.
|
|
*
|
|
* - The JS::Value operations are preferred. The JSVAL_* operations remain for
|
|
* compatibility; they may be removed at some point. These operations mostly
|
|
* provide similar functionality. But there are a few key differences. One
|
|
* is that JS::Value gives null a separate type.
|
|
* Also, to help prevent mistakenly boxing a nullable JSObject* as an object,
|
|
* Value::setObject takes a JSObject&. (Conversely, Value::toObject returns a
|
|
* JSObject&.) A convenience member Value::setObjectOrNull is provided.
|
|
*
|
|
* - JSVAL_VOID is the same as the singleton value of the Undefined type.
|
|
*
|
|
* - Note that JS::Value is 8 bytes on 32 and 64-bit architectures. Thus, on
|
|
* 32-bit user code should avoid copying jsval/JS::Value as much as possible,
|
|
* preferring to pass by const Value&.
|
|
*/
|
|
class Value
|
|
{
|
|
public:
|
|
/*
|
|
* N.B. the default constructor leaves Value unitialized. Adding a default
|
|
* constructor prevents Value from being stored in a union.
|
|
*/
|
|
#if defined(JS_VALUE_IS_CONSTEXPR)
|
|
Value() = default;
|
|
Value(const Value& v) = default;
|
|
#endif
|
|
|
|
/**
|
|
* Returns false if creating a NumberValue containing the given type would
|
|
* be lossy, true otherwise.
|
|
*/
|
|
template <typename T>
|
|
static bool isNumberRepresentable(const T t) {
|
|
return T(double(t)) == t;
|
|
}
|
|
|
|
/*** Mutators ***/
|
|
|
|
void setNull() {
|
|
data.asBits = BUILD_JSVAL(JSVAL_TAG_NULL, 0).asBits;
|
|
}
|
|
|
|
void setUndefined() {
|
|
data.asBits = BUILD_JSVAL(JSVAL_TAG_UNDEFINED, 0).asBits;
|
|
}
|
|
|
|
void setInt32(int32_t i) {
|
|
data = INT32_TO_JSVAL_IMPL(i);
|
|
}
|
|
|
|
int32_t& getInt32Ref() {
|
|
MOZ_ASSERT(isInt32());
|
|
return data.s.payload.i32;
|
|
}
|
|
|
|
void setDouble(double d) {
|
|
data = DOUBLE_TO_JSVAL_IMPL(d);
|
|
}
|
|
|
|
void setNaN() {
|
|
setDouble(GenericNaN());
|
|
}
|
|
|
|
double& getDoubleRef() {
|
|
MOZ_ASSERT(isDouble());
|
|
return data.asDouble;
|
|
}
|
|
|
|
void setString(JSString* str) {
|
|
data = STRING_TO_JSVAL_IMPL(str);
|
|
}
|
|
|
|
void setSymbol(JS::Symbol* sym) {
|
|
data = SYMBOL_TO_JSVAL_IMPL(sym);
|
|
}
|
|
|
|
void setObject(JSObject& obj) {
|
|
data = OBJECT_TO_JSVAL_IMPL(&obj);
|
|
}
|
|
|
|
void setBoolean(bool b) {
|
|
data = BOOLEAN_TO_JSVAL_IMPL(b);
|
|
}
|
|
|
|
void setMagic(JSWhyMagic why) {
|
|
data = MAGIC_TO_JSVAL_IMPL(why);
|
|
}
|
|
|
|
void setMagicUint32(uint32_t payload) {
|
|
data = MAGIC_UINT32_TO_JSVAL_IMPL(payload);
|
|
}
|
|
|
|
bool setNumber(uint32_t ui) {
|
|
if (ui > JSVAL_INT_MAX) {
|
|
setDouble((double)ui);
|
|
return false;
|
|
} else {
|
|
setInt32((int32_t)ui);
|
|
return true;
|
|
}
|
|
}
|
|
|
|
bool setNumber(double d) {
|
|
int32_t i;
|
|
if (mozilla::NumberIsInt32(d, &i)) {
|
|
setInt32(i);
|
|
return true;
|
|
}
|
|
|
|
setDouble(d);
|
|
return false;
|
|
}
|
|
|
|
void setObjectOrNull(JSObject* arg) {
|
|
if (arg)
|
|
setObject(*arg);
|
|
else
|
|
setNull();
|
|
}
|
|
|
|
void swap(Value& rhs) {
|
|
uint64_t tmp = rhs.data.asBits;
|
|
rhs.data.asBits = data.asBits;
|
|
data.asBits = tmp;
|
|
}
|
|
|
|
/*** Value type queries ***/
|
|
|
|
bool isUndefined() const {
|
|
return JSVAL_IS_UNDEFINED_IMPL(data);
|
|
}
|
|
|
|
bool isNull() const {
|
|
return JSVAL_IS_NULL_IMPL(data);
|
|
}
|
|
|
|
bool isNullOrUndefined() const {
|
|
return isNull() || isUndefined();
|
|
}
|
|
|
|
bool isInt32() const {
|
|
return JSVAL_IS_INT32_IMPL(data);
|
|
}
|
|
|
|
bool isInt32(int32_t i32) const {
|
|
return JSVAL_IS_SPECIFIC_INT32_IMPL(data, i32);
|
|
}
|
|
|
|
bool isDouble() const {
|
|
return JSVAL_IS_DOUBLE_IMPL(data);
|
|
}
|
|
|
|
bool isNumber() const {
|
|
return JSVAL_IS_NUMBER_IMPL(data);
|
|
}
|
|
|
|
bool isString() const {
|
|
return JSVAL_IS_STRING_IMPL(data);
|
|
}
|
|
|
|
bool isSymbol() const {
|
|
return JSVAL_IS_SYMBOL_IMPL(data);
|
|
}
|
|
|
|
bool isObject() const {
|
|
return JSVAL_IS_OBJECT_IMPL(data);
|
|
}
|
|
|
|
bool isPrimitive() const {
|
|
return JSVAL_IS_PRIMITIVE_IMPL(data);
|
|
}
|
|
|
|
bool isObjectOrNull() const {
|
|
return JSVAL_IS_OBJECT_OR_NULL_IMPL(data);
|
|
}
|
|
|
|
bool isGCThing() const {
|
|
return JSVAL_IS_GCTHING_IMPL(data);
|
|
}
|
|
|
|
bool isBoolean() const {
|
|
return JSVAL_IS_BOOLEAN_IMPL(data);
|
|
}
|
|
|
|
bool isTrue() const {
|
|
return JSVAL_IS_SPECIFIC_BOOLEAN_IMPL(data, true);
|
|
}
|
|
|
|
bool isFalse() const {
|
|
return JSVAL_IS_SPECIFIC_BOOLEAN_IMPL(data, false);
|
|
}
|
|
|
|
bool isMagic() const {
|
|
return JSVAL_IS_MAGIC_IMPL(data);
|
|
}
|
|
|
|
bool isMagic(JSWhyMagic why) const {
|
|
MOZ_ASSERT_IF(isMagic(), data.s.payload.why == why);
|
|
return JSVAL_IS_MAGIC_IMPL(data);
|
|
}
|
|
|
|
bool isMarkable() const {
|
|
return JSVAL_IS_TRACEABLE_IMPL(data);
|
|
}
|
|
|
|
JS::TraceKind traceKind() const {
|
|
MOZ_ASSERT(isMarkable());
|
|
return JS::TraceKind(JSVAL_TRACE_KIND_IMPL(data));
|
|
}
|
|
|
|
JSWhyMagic whyMagic() const {
|
|
MOZ_ASSERT(isMagic());
|
|
return data.s.payload.why;
|
|
}
|
|
|
|
uint32_t magicUint32() const {
|
|
MOZ_ASSERT(isMagic());
|
|
return data.s.payload.u32;
|
|
}
|
|
|
|
/*** Comparison ***/
|
|
|
|
bool operator==(const Value& rhs) const {
|
|
return data.asBits == rhs.data.asBits;
|
|
}
|
|
|
|
bool operator!=(const Value& rhs) const {
|
|
return data.asBits != rhs.data.asBits;
|
|
}
|
|
|
|
friend inline bool SameType(const Value& lhs, const Value& rhs);
|
|
|
|
/*** Extract the value's typed payload ***/
|
|
|
|
int32_t toInt32() const {
|
|
MOZ_ASSERT(isInt32());
|
|
return JSVAL_TO_INT32_IMPL(data);
|
|
}
|
|
|
|
double toDouble() const {
|
|
MOZ_ASSERT(isDouble());
|
|
return data.asDouble;
|
|
}
|
|
|
|
double toNumber() const {
|
|
MOZ_ASSERT(isNumber());
|
|
return isDouble() ? toDouble() : double(toInt32());
|
|
}
|
|
|
|
JSString* toString() const {
|
|
MOZ_ASSERT(isString());
|
|
return JSVAL_TO_STRING_IMPL(data);
|
|
}
|
|
|
|
JS::Symbol* toSymbol() const {
|
|
MOZ_ASSERT(isSymbol());
|
|
return JSVAL_TO_SYMBOL_IMPL(data);
|
|
}
|
|
|
|
JSObject& toObject() const {
|
|
MOZ_ASSERT(isObject());
|
|
return *JSVAL_TO_OBJECT_IMPL(data);
|
|
}
|
|
|
|
JSObject* toObjectOrNull() const {
|
|
MOZ_ASSERT(isObjectOrNull());
|
|
return JSVAL_TO_OBJECT_IMPL(data);
|
|
}
|
|
|
|
js::gc::Cell* toGCThing() const {
|
|
MOZ_ASSERT(isGCThing());
|
|
return JSVAL_TO_GCTHING_IMPL(data);
|
|
}
|
|
|
|
GCCellPtr toGCCellPtr() const {
|
|
return GCCellPtr(toGCThing(), traceKind());
|
|
}
|
|
|
|
bool toBoolean() const {
|
|
MOZ_ASSERT(isBoolean());
|
|
return JSVAL_TO_BOOLEAN_IMPL(data);
|
|
}
|
|
|
|
uint32_t payloadAsRawUint32() const {
|
|
MOZ_ASSERT(!isDouble());
|
|
return data.s.payload.u32;
|
|
}
|
|
|
|
uint64_t asRawBits() const {
|
|
return data.asBits;
|
|
}
|
|
|
|
JSValueType extractNonDoubleType() const {
|
|
return JSVAL_EXTRACT_NON_DOUBLE_TYPE_IMPL(data);
|
|
}
|
|
|
|
/*
|
|
* Private API
|
|
*
|
|
* Private setters/getters allow the caller to read/write arbitrary types
|
|
* that fit in the 64-bit payload. It is the caller's responsibility, after
|
|
* storing to a value with setPrivateX to read only using getPrivateX.
|
|
* Privates values are given a type which ensures they are not marked.
|
|
*/
|
|
|
|
void setPrivate(void* ptr) {
|
|
data = PRIVATE_PTR_TO_JSVAL_IMPL(ptr);
|
|
}
|
|
|
|
void* toPrivate() const {
|
|
MOZ_ASSERT(JSVAL_IS_DOUBLE_IMPL(data));
|
|
return JSVAL_TO_PRIVATE_PTR_IMPL(data);
|
|
}
|
|
|
|
void setPrivateUint32(uint32_t ui) {
|
|
MOZ_ASSERT(uint32_t(int32_t(ui)) == ui);
|
|
setInt32(int32_t(ui));
|
|
}
|
|
|
|
uint32_t toPrivateUint32() const {
|
|
return uint32_t(toInt32());
|
|
}
|
|
|
|
/*
|
|
* An unmarked value is just a void* cast as a Value. Thus, the Value is
|
|
* not safe for GC and must not be marked. This API avoids raw casts
|
|
* and the ensuing strict-aliasing warnings.
|
|
*/
|
|
|
|
void setUnmarkedPtr(void* ptr) {
|
|
data.asPtr = ptr;
|
|
}
|
|
|
|
void* toUnmarkedPtr() const {
|
|
return data.asPtr;
|
|
}
|
|
|
|
const size_t* payloadWord() const {
|
|
#if defined(JS_NUNBOX32)
|
|
return &data.s.payload.word;
|
|
#elif defined(JS_PUNBOX64)
|
|
return &data.asWord;
|
|
#endif
|
|
}
|
|
|
|
const uintptr_t* payloadUIntPtr() const {
|
|
#if defined(JS_NUNBOX32)
|
|
return &data.s.payload.uintptr;
|
|
#elif defined(JS_PUNBOX64)
|
|
return &data.asUIntPtr;
|
|
#endif
|
|
}
|
|
|
|
#if !defined(_MSC_VER) && !defined(__sparc)
|
|
// Value must be POD so that MSVC will pass it by value and not in memory
|
|
// (bug 689101); the same is true for SPARC as well (bug 737344). More
|
|
// precisely, we don't want Value return values compiled as out params.
|
|
private:
|
|
#endif
|
|
|
|
jsval_layout data;
|
|
|
|
private:
|
|
#if defined(JS_VALUE_IS_CONSTEXPR)
|
|
MOZ_IMPLICIT JS_VALUE_CONSTEXPR Value(jsval_layout layout) : data(layout) {}
|
|
#endif
|
|
|
|
void staticAssertions() {
|
|
JS_STATIC_ASSERT(sizeof(JSValueType) == 1);
|
|
JS_STATIC_ASSERT(sizeof(JSValueTag) == 4);
|
|
JS_STATIC_ASSERT(sizeof(JSWhyMagic) <= 4);
|
|
JS_STATIC_ASSERT(sizeof(Value) == 8);
|
|
}
|
|
|
|
friend jsval_layout (::JSVAL_TO_IMPL)(Value);
|
|
friend Value JS_VALUE_CONSTEXPR (::IMPL_TO_JSVAL)(jsval_layout l);
|
|
friend Value JS_VALUE_CONSTEXPR (JS::UndefinedValue)();
|
|
};
|
|
|
|
inline bool
|
|
IsOptimizedPlaceholderMagicValue(const Value& v)
|
|
{
|
|
if (v.isMagic()) {
|
|
MOZ_ASSERT(v.whyMagic() == JS_OPTIMIZED_ARGUMENTS || v.whyMagic() == JS_OPTIMIZED_OUT);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static MOZ_ALWAYS_INLINE void
|
|
ExposeValueToActiveJS(const Value& v)
|
|
{
|
|
if (v.isMarkable())
|
|
js::gc::ExposeGCThingToActiveJS(GCCellPtr(v));
|
|
}
|
|
|
|
/************************************************************************/
|
|
|
|
static inline Value
|
|
NullValue()
|
|
{
|
|
Value v;
|
|
v.setNull();
|
|
return v;
|
|
}
|
|
|
|
static inline JS_VALUE_CONSTEXPR Value
|
|
UndefinedValue()
|
|
{
|
|
#if defined(JS_VALUE_IS_CONSTEXPR)
|
|
return Value(BUILD_JSVAL(JSVAL_TAG_UNDEFINED, 0));
|
|
#else
|
|
JS::Value v;
|
|
v.setUndefined();
|
|
return v;
|
|
#endif
|
|
}
|
|
|
|
static inline JS_VALUE_CONSTEXPR Value
|
|
Int32Value(int32_t i32)
|
|
{
|
|
return IMPL_TO_JSVAL(INT32_TO_JSVAL_IMPL(i32));
|
|
}
|
|
|
|
static inline Value
|
|
DoubleValue(double dbl)
|
|
{
|
|
Value v;
|
|
v.setDouble(dbl);
|
|
return v;
|
|
}
|
|
|
|
static inline JS_VALUE_CONSTEXPR Value
|
|
CanonicalizedDoubleValue(double d)
|
|
{
|
|
/*
|
|
* This is a manually inlined version of:
|
|
* d = JS_CANONICALIZE_NAN(d);
|
|
* return IMPL_TO_JSVAL(DOUBLE_TO_JSVAL_IMPL(d));
|
|
* because GCC from XCode 3.1.4 miscompiles the above code.
|
|
*/
|
|
#if defined(JS_VALUE_IS_CONSTEXPR)
|
|
return IMPL_TO_JSVAL(MOZ_UNLIKELY(mozilla::IsNaN(d))
|
|
? (jsval_layout) { .asBits = 0x7FF8000000000000LL }
|
|
: (jsval_layout) { .asDouble = d });
|
|
#else
|
|
jsval_layout l;
|
|
if (MOZ_UNLIKELY(d != d))
|
|
l.asBits = 0x7FF8000000000000LL;
|
|
else
|
|
l.asDouble = d;
|
|
return IMPL_TO_JSVAL(l);
|
|
#endif
|
|
}
|
|
|
|
static inline Value
|
|
DoubleNaNValue()
|
|
{
|
|
Value v;
|
|
v.setNaN();
|
|
return v;
|
|
}
|
|
|
|
static inline Value
|
|
Float32Value(float f)
|
|
{
|
|
Value v;
|
|
v.setDouble(f);
|
|
return v;
|
|
}
|
|
|
|
static inline Value
|
|
StringValue(JSString* str)
|
|
{
|
|
Value v;
|
|
v.setString(str);
|
|
return v;
|
|
}
|
|
|
|
static inline Value
|
|
SymbolValue(JS::Symbol* sym)
|
|
{
|
|
Value v;
|
|
v.setSymbol(sym);
|
|
return v;
|
|
}
|
|
|
|
static inline Value
|
|
BooleanValue(bool boo)
|
|
{
|
|
Value v;
|
|
v.setBoolean(boo);
|
|
return v;
|
|
}
|
|
|
|
static inline Value
|
|
TrueValue()
|
|
{
|
|
Value v;
|
|
v.setBoolean(true);
|
|
return v;
|
|
}
|
|
|
|
static inline Value
|
|
FalseValue()
|
|
{
|
|
Value v;
|
|
v.setBoolean(false);
|
|
return v;
|
|
}
|
|
|
|
static inline Value
|
|
ObjectValue(JSObject& obj)
|
|
{
|
|
Value v;
|
|
v.setObject(obj);
|
|
return v;
|
|
}
|
|
|
|
static inline Value
|
|
ObjectValueCrashOnTouch()
|
|
{
|
|
Value v;
|
|
v.setObject(*reinterpret_cast<JSObject*>(0x42));
|
|
return v;
|
|
}
|
|
|
|
static inline Value
|
|
MagicValue(JSWhyMagic why)
|
|
{
|
|
Value v;
|
|
v.setMagic(why);
|
|
return v;
|
|
}
|
|
|
|
static inline Value
|
|
MagicValueUint32(uint32_t payload)
|
|
{
|
|
Value v;
|
|
v.setMagicUint32(payload);
|
|
return v;
|
|
}
|
|
|
|
static inline Value
|
|
NumberValue(float f)
|
|
{
|
|
Value v;
|
|
v.setNumber(f);
|
|
return v;
|
|
}
|
|
|
|
static inline Value
|
|
NumberValue(double dbl)
|
|
{
|
|
Value v;
|
|
v.setNumber(dbl);
|
|
return v;
|
|
}
|
|
|
|
static inline Value
|
|
NumberValue(int8_t i)
|
|
{
|
|
return Int32Value(i);
|
|
}
|
|
|
|
static inline Value
|
|
NumberValue(uint8_t i)
|
|
{
|
|
return Int32Value(i);
|
|
}
|
|
|
|
static inline Value
|
|
NumberValue(int16_t i)
|
|
{
|
|
return Int32Value(i);
|
|
}
|
|
|
|
static inline Value
|
|
NumberValue(uint16_t i)
|
|
{
|
|
return Int32Value(i);
|
|
}
|
|
|
|
static inline Value
|
|
NumberValue(int32_t i)
|
|
{
|
|
return Int32Value(i);
|
|
}
|
|
|
|
static inline JS_VALUE_CONSTEXPR Value
|
|
NumberValue(uint32_t i)
|
|
{
|
|
return i <= JSVAL_INT_MAX
|
|
? Int32Value(int32_t(i))
|
|
: CanonicalizedDoubleValue(double(i));
|
|
}
|
|
|
|
namespace detail {
|
|
|
|
template <bool Signed>
|
|
class MakeNumberValue
|
|
{
|
|
public:
|
|
template<typename T>
|
|
static inline Value create(const T t)
|
|
{
|
|
Value v;
|
|
if (JSVAL_INT_MIN <= t && t <= JSVAL_INT_MAX)
|
|
v.setInt32(int32_t(t));
|
|
else
|
|
v.setDouble(double(t));
|
|
return v;
|
|
}
|
|
};
|
|
|
|
template <>
|
|
class MakeNumberValue<false>
|
|
{
|
|
public:
|
|
template<typename T>
|
|
static inline Value create(const T t)
|
|
{
|
|
Value v;
|
|
if (t <= JSVAL_INT_MAX)
|
|
v.setInt32(int32_t(t));
|
|
else
|
|
v.setDouble(double(t));
|
|
return v;
|
|
}
|
|
};
|
|
|
|
} // namespace detail
|
|
|
|
template <typename T>
|
|
static inline Value
|
|
NumberValue(const T t)
|
|
{
|
|
MOZ_ASSERT(Value::isNumberRepresentable(t), "value creation would be lossy");
|
|
return detail::MakeNumberValue<std::numeric_limits<T>::is_signed>::create(t);
|
|
}
|
|
|
|
static inline Value
|
|
ObjectOrNullValue(JSObject* obj)
|
|
{
|
|
Value v;
|
|
v.setObjectOrNull(obj);
|
|
return v;
|
|
}
|
|
|
|
static inline Value
|
|
PrivateValue(void* ptr)
|
|
{
|
|
Value v;
|
|
v.setPrivate(ptr);
|
|
return v;
|
|
}
|
|
|
|
static inline Value
|
|
PrivateUint32Value(uint32_t ui)
|
|
{
|
|
Value v;
|
|
v.setPrivateUint32(ui);
|
|
return v;
|
|
}
|
|
|
|
inline bool
|
|
SameType(const Value& lhs, const Value& rhs)
|
|
{
|
|
return JSVAL_SAME_TYPE_IMPL(lhs.data, rhs.data);
|
|
}
|
|
|
|
} // namespace JS
|
|
|
|
/************************************************************************/
|
|
|
|
namespace JS {
|
|
JS_PUBLIC_API(void) HeapValuePostBarrier(Value* valuep, const Value& prev, const Value& next);
|
|
} // namespace JS
|
|
|
|
namespace js {
|
|
|
|
template <>
|
|
struct GCPolicy<JS::Value>
|
|
{
|
|
static JS::Value initial() { return JS::UndefinedValue(); }
|
|
static void trace(JSTracer* trc, JS::Value* v, const char* name) {
|
|
js::UnsafeTraceManuallyBarrieredEdge(trc, v, name);
|
|
}
|
|
};
|
|
|
|
template <>
|
|
struct BarrierMethods<JS::Value>
|
|
{
|
|
static gc::Cell* asGCThingOrNull(const JS::Value& v) {
|
|
return v.isMarkable() ? v.toGCThing() : nullptr;
|
|
}
|
|
static void postBarrier(JS::Value* v, const JS::Value& prev, const JS::Value& next) {
|
|
JS::HeapValuePostBarrier(v, prev, next);
|
|
}
|
|
};
|
|
|
|
template <class Outer> class MutableValueOperations;
|
|
|
|
/**
|
|
* A class designed for CRTP use in implementing the non-mutating parts of the
|
|
* Value interface in Value-like classes. Outer must be a class inheriting
|
|
* ValueOperations<Outer> with a visible get() method returning a const
|
|
* reference to the Value abstracted by Outer.
|
|
*/
|
|
template <class Outer>
|
|
class ValueOperations
|
|
{
|
|
friend class MutableValueOperations<Outer>;
|
|
|
|
const JS::Value& value() const { return static_cast<const Outer*>(this)->get(); }
|
|
|
|
public:
|
|
bool isUndefined() const { return value().isUndefined(); }
|
|
bool isNull() const { return value().isNull(); }
|
|
bool isBoolean() const { return value().isBoolean(); }
|
|
bool isTrue() const { return value().isTrue(); }
|
|
bool isFalse() const { return value().isFalse(); }
|
|
bool isNumber() const { return value().isNumber(); }
|
|
bool isInt32() const { return value().isInt32(); }
|
|
bool isInt32(int32_t i32) const { return value().isInt32(i32); }
|
|
bool isDouble() const { return value().isDouble(); }
|
|
bool isString() const { return value().isString(); }
|
|
bool isSymbol() const { return value().isSymbol(); }
|
|
bool isObject() const { return value().isObject(); }
|
|
bool isMagic() const { return value().isMagic(); }
|
|
bool isMagic(JSWhyMagic why) const { return value().isMagic(why); }
|
|
bool isMarkable() const { return value().isMarkable(); }
|
|
bool isPrimitive() const { return value().isPrimitive(); }
|
|
bool isGCThing() const { return value().isGCThing(); }
|
|
|
|
bool isNullOrUndefined() const { return value().isNullOrUndefined(); }
|
|
bool isObjectOrNull() const { return value().isObjectOrNull(); }
|
|
|
|
bool toBoolean() const { return value().toBoolean(); }
|
|
double toNumber() const { return value().toNumber(); }
|
|
int32_t toInt32() const { return value().toInt32(); }
|
|
double toDouble() const { return value().toDouble(); }
|
|
JSString* toString() const { return value().toString(); }
|
|
JS::Symbol* toSymbol() const { return value().toSymbol(); }
|
|
JSObject& toObject() const { return value().toObject(); }
|
|
JSObject* toObjectOrNull() const { return value().toObjectOrNull(); }
|
|
gc::Cell* toGCThing() const { return value().toGCThing(); }
|
|
JS::TraceKind traceKind() const { return value().traceKind(); }
|
|
uint64_t asRawBits() const { return value().asRawBits(); }
|
|
|
|
JSValueType extractNonDoubleType() const { return value().extractNonDoubleType(); }
|
|
uint32_t toPrivateUint32() const { return value().toPrivateUint32(); }
|
|
|
|
JSWhyMagic whyMagic() const { return value().whyMagic(); }
|
|
uint32_t magicUint32() const { return value().magicUint32(); }
|
|
};
|
|
|
|
/**
|
|
* A class designed for CRTP use in implementing all the mutating parts of the
|
|
* Value interface in Value-like classes. Outer must be a class inheriting
|
|
* MutableValueOperations<Outer> with visible get() methods returning const and
|
|
* non-const references to the Value abstracted by Outer.
|
|
*/
|
|
template <class Outer>
|
|
class MutableValueOperations : public ValueOperations<Outer>
|
|
{
|
|
JS::Value& value() { return static_cast<Outer*>(this)->get(); }
|
|
|
|
public:
|
|
void setNull() { value().setNull(); }
|
|
void setUndefined() { value().setUndefined(); }
|
|
void setInt32(int32_t i) { value().setInt32(i); }
|
|
void setDouble(double d) { value().setDouble(d); }
|
|
void setNaN() { setDouble(JS::GenericNaN()); }
|
|
void setBoolean(bool b) { value().setBoolean(b); }
|
|
void setMagic(JSWhyMagic why) { value().setMagic(why); }
|
|
bool setNumber(uint32_t ui) { return value().setNumber(ui); }
|
|
bool setNumber(double d) { return value().setNumber(d); }
|
|
void setString(JSString* str) { this->value().setString(str); }
|
|
void setSymbol(JS::Symbol* sym) { this->value().setSymbol(sym); }
|
|
void setObject(JSObject& obj) { this->value().setObject(obj); }
|
|
void setObjectOrNull(JSObject* arg) { this->value().setObjectOrNull(arg); }
|
|
};
|
|
|
|
/*
|
|
* Augment the generic Heap<T> interface when T = Value with
|
|
* type-querying, value-extracting, and mutating operations.
|
|
*/
|
|
template <>
|
|
class HeapBase<JS::Value> : public ValueOperations<JS::Heap<JS::Value> >
|
|
{
|
|
typedef JS::Heap<JS::Value> Outer;
|
|
|
|
friend class ValueOperations<Outer>;
|
|
|
|
void setBarriered(const JS::Value& v) {
|
|
*static_cast<JS::Heap<JS::Value>*>(this) = v;
|
|
}
|
|
|
|
public:
|
|
void setNull() { setBarriered(JS::NullValue()); }
|
|
void setUndefined() { setBarriered(JS::UndefinedValue()); }
|
|
void setInt32(int32_t i) { setBarriered(JS::Int32Value(i)); }
|
|
void setDouble(double d) { setBarriered(JS::DoubleValue(d)); }
|
|
void setNaN() { setDouble(JS::GenericNaN()); }
|
|
void setBoolean(bool b) { setBarriered(JS::BooleanValue(b)); }
|
|
void setMagic(JSWhyMagic why) { setBarriered(JS::MagicValue(why)); }
|
|
void setString(JSString* str) { setBarriered(JS::StringValue(str)); }
|
|
void setSymbol(JS::Symbol* sym) { setBarriered(JS::SymbolValue(sym)); }
|
|
void setObject(JSObject& obj) { setBarriered(JS::ObjectValue(obj)); }
|
|
|
|
bool setNumber(uint32_t ui) {
|
|
if (ui > JSVAL_INT_MAX) {
|
|
setDouble((double)ui);
|
|
return false;
|
|
} else {
|
|
setInt32((int32_t)ui);
|
|
return true;
|
|
}
|
|
}
|
|
|
|
bool setNumber(double d) {
|
|
int32_t i;
|
|
if (mozilla::NumberIsInt32(d, &i)) {
|
|
setInt32(i);
|
|
return true;
|
|
}
|
|
|
|
setDouble(d);
|
|
return false;
|
|
}
|
|
|
|
void setObjectOrNull(JSObject* arg) {
|
|
if (arg)
|
|
setObject(*arg);
|
|
else
|
|
setNull();
|
|
}
|
|
};
|
|
|
|
template <>
|
|
class HandleBase<JS::Value> : public ValueOperations<JS::Handle<JS::Value> >
|
|
{};
|
|
|
|
template <>
|
|
class MutableHandleBase<JS::Value> : public MutableValueOperations<JS::MutableHandle<JS::Value> >
|
|
{};
|
|
|
|
template <>
|
|
class RootedBase<JS::Value> : public MutableValueOperations<JS::Rooted<JS::Value> >
|
|
{};
|
|
|
|
template <>
|
|
class PersistentRootedBase<JS::Value> : public MutableValueOperations<JS::PersistentRooted<JS::Value>>
|
|
{};
|
|
|
|
/*
|
|
* If the Value is a GC pointer type, convert to that type and call |f| with
|
|
* the pointer. If the Value is not a GC type, calls F::defaultValue.
|
|
*/
|
|
template <typename F, typename... Args>
|
|
auto
|
|
DispatchTyped(F f, const JS::Value& val, Args&&... args)
|
|
-> decltype(f(static_cast<JSObject*>(nullptr), mozilla::Forward<Args>(args)...))
|
|
{
|
|
if (val.isString())
|
|
return f(val.toString(), mozilla::Forward<Args>(args)...);
|
|
if (val.isObject())
|
|
return f(&val.toObject(), mozilla::Forward<Args>(args)...);
|
|
if (val.isSymbol())
|
|
return f(val.toSymbol(), mozilla::Forward<Args>(args)...);
|
|
MOZ_ASSERT(!val.isMarkable());
|
|
return F::defaultValue(val);
|
|
}
|
|
|
|
template <class S> struct VoidDefaultAdaptor { static void defaultValue(S) {} };
|
|
template <class S> struct IdentityDefaultAdaptor { static S defaultValue(const S& v) {return v;} };
|
|
template <class S, bool v> struct BoolDefaultAdaptor { static bool defaultValue(S) { return v; } };
|
|
|
|
} // namespace js
|
|
|
|
inline jsval_layout
|
|
JSVAL_TO_IMPL(JS::Value v)
|
|
{
|
|
return v.data;
|
|
}
|
|
|
|
inline JS_VALUE_CONSTEXPR JS::Value
|
|
IMPL_TO_JSVAL(jsval_layout l)
|
|
{
|
|
#if defined(JS_VALUE_IS_CONSTEXPR)
|
|
return JS::Value(l);
|
|
#else
|
|
JS::Value v;
|
|
v.data = l;
|
|
return v;
|
|
#endif
|
|
}
|
|
|
|
namespace JS {
|
|
|
|
#ifdef JS_DEBUG
|
|
namespace detail {
|
|
|
|
struct ValueAlignmentTester { char c; JS::Value v; };
|
|
static_assert(sizeof(ValueAlignmentTester) == 16,
|
|
"JS::Value must be 16-byte-aligned");
|
|
|
|
struct LayoutAlignmentTester { char c; jsval_layout l; };
|
|
static_assert(sizeof(LayoutAlignmentTester) == 16,
|
|
"jsval_layout must be 16-byte-aligned");
|
|
|
|
} // namespace detail
|
|
#endif /* JS_DEBUG */
|
|
|
|
} // namespace JS
|
|
|
|
static_assert(sizeof(jsval_layout) == sizeof(JS::Value),
|
|
"jsval_layout and JS::Value must have identical layouts");
|
|
|
|
/************************************************************************/
|
|
|
|
namespace JS {
|
|
|
|
extern JS_PUBLIC_DATA(const HandleValue) NullHandleValue;
|
|
extern JS_PUBLIC_DATA(const HandleValue) UndefinedHandleValue;
|
|
extern JS_PUBLIC_DATA(const HandleValue) TrueHandleValue;
|
|
extern JS_PUBLIC_DATA(const HandleValue) FalseHandleValue;
|
|
|
|
} // namespace JS
|
|
|
|
#undef JS_VALUE_IS_CONSTEXPR
|
|
#undef JS_RETURN_LAYOUT_FROM_BITS
|
|
|
|
#endif /* js_Value_h */
|