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Bug 1411415.

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wolfbeast 2018-04-29 13:39:11 +02:00 • committed by Roy Tam
commit 66bf4fa8f9
10 changed files with 91 additions and 33 deletions
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55
js/public/Value.h
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@ -140,12 +140,16 @@ static_assert(sizeof(JSValueShiftedTag) == sizeof(uint64_t),
#define JSVAL_TYPE_TO_TAG(type) ((JSValueTag)(JSVAL_TAG_CLEAR | (type)))
#define JSVAL_RAW64_UNDEFINED (uint64_t(JSVAL_TAG_UNDEFINED) << 32)
#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 defined(JS_PUNBOX64)
#define JSVAL_RAW64_UNDEFINED (uint64_t(JSVAL_TAG_UNDEFINED) << JSVAL_TAG_SHIFT)
#define JSVAL_PAYLOAD_MASK 0x00007FFFFFFFFFFFLL
#define JSVAL_TAG_MASK 0xFFFF800000000000LL
#define JSVAL_TYPE_TO_TAG(type) ((JSValueTag)(JSVAL_TAG_MAX_DOUBLE | (type)))
@ -817,7 +821,7 @@ class MOZ_NON_PARAM alignas(8) Value
double asDouble;
void* asPtr;
layout() = default;
layout() : asBits(JSVAL_RAW64_UNDEFINED) {}
explicit constexpr layout(uint64_t bits) : asBits(bits) {}
explicit constexpr layout(double d) : asDouble(d) {}
} data;
@ -843,7 +847,7 @@ class MOZ_NON_PARAM alignas(8) Value
size_t asWord;
uintptr_t asUIntPtr;
layout() = default;
layout() : asBits(JSVAL_RAW64_UNDEFINED) {}
explicit constexpr layout(uint64_t bits) : asBits(bits) {}
explicit constexpr layout(double d) : asDouble(d) {}
} data;
@ -871,7 +875,7 @@ class MOZ_NON_PARAM alignas(8) Value
double asDouble;
void* asPtr;
layout() = default;
layout() : asBits(JSVAL_RAW64_UNDEFINED) {}
explicit constexpr layout(uint64_t bits) : asBits(bits) {}
explicit constexpr layout(double d) : asDouble(d) {}
} data;
@ -895,7 +899,7 @@ class MOZ_NON_PARAM alignas(8) Value
size_t asWord;
uintptr_t asUIntPtr;
layout() = default;
layout() : asBits(JSVAL_RAW64_UNDEFINED) {}
explicit constexpr layout(uint64_t bits) : asBits(bits) {}
explicit constexpr layout(double d) : asDouble(d) {}
} data;
@ -948,8 +952,51 @@ class MOZ_NON_PARAM alignas(8) Value
}
} JS_HAZ_GC_POINTER;
/**
* This is a null-constructible structure that can convert to and from
* a Value, allowing UninitializedValue to be stored in unions.
*/
struct MOZ_NON_PARAM alignas(8) UninitializedValue
{
private:
uint64_t bits;
public:
UninitializedValue() = default;
UninitializedValue(const UninitializedValue&) = default;
MOZ_IMPLICIT UninitializedValue(const Value& val) : bits(val.asRawBits()) {}
inline uint64_t asRawBits() const {
return bits;
}
inline Value& asValueRef() {
return *reinterpret_cast<Value*>(this);
}
inline const Value& asValueRef() const {
return *reinterpret_cast<const Value*>(this);
}
inline operator Value&() {
return asValueRef();
}
inline operator Value const&() const {
return asValueRef();
}
inline operator Value() const {
return asValueRef();
}
inline void operator=(Value const& other) {
asValueRef() = other;
}
};
static_assert(sizeof(Value) == 8, "Value size must leave three tag bits, be a binary power, and is ubiquitously depended upon everywhere");
static_assert(sizeof(UninitializedValue) == sizeof(Value), "Value and UninitializedValue must be the same size");
static_assert(alignof(UninitializedValue) == alignof(Value), "Value and UninitializedValue must have same alignment");
inline bool
IsOptimizedPlaceholderMagicValue(const Value& v)
{