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Bug 911334 - More precisely specify bit layout of JSScript flags. r=Waldo

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This commit is contained in:
Andy Wingo 2013-10-08 12:19:40 +02:00
parent a23cd291d5
commit adf7c6adcc
1 changed files with 8 additions and 7 deletions
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15
js/src/jsscript.h
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@ -542,7 +542,7 @@ class JSScript : public js::gc::BarrieredCell<JSScript>
uint16_t nslots; /* vars plus maximum stack depth */
uint16_t staticLevel;/* static level for display maintenance */
// 4-bit fields.
// Bit fields.
public:
// The kinds of the optional arrays.
@ -557,10 +557,13 @@ class JSScript : public js::gc::BarrieredCell<JSScript>
private:
// The bits in this field indicate the presence/non-presence of several
// optional arrays in |data|. See the comments above Create() for details.
uint8_t hasArrayBits:4;
uint8_t hasArrayBits:ARRAY_KIND_BITS;
// The GeneratorKind of the script.
uint8_t generatorKindBits_:4;
uint8_t generatorKindBits_:2;
// Unused padding; feel free to steal these if you need them.
uint8_t padToByte_:2;
// 1-bit fields.
@ -1076,11 +1079,9 @@ class JSScript : public js::gc::BarrieredCell<JSScript>
void markChildren(JSTracer *trc);
};
/* The array kind flags are stored in a 4-bit field; make sure they fit. */
JS_STATIC_ASSERT(JSScript::ARRAY_KIND_BITS <= 4);
/* If this fails, add/remove padding within JSScript. */
JS_STATIC_ASSERT(sizeof(JSScript) % js::gc::CellSize == 0);
static_assert(sizeof(JSScript) % js::gc::CellSize == 0,
"Size of JSScript must be an integral multiple of js::gc::CellSize");
namespace js {