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Bug 774760 - Fix unaligned PCCounts double access (r=luke)

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--HG--
extra : rebase_source : ac9c1d9cb21611a5c23ca92a187b7f3e0e422cf4
This commit is contained in:
Chao-ying Fu 2012-07-24 11:11:44 -07:00
parent f982e42c93
commit cd57edc68c
2 changed files with 6 additions and 0 deletions
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5
js/src/jsopcode.h
View File

@ -497,6 +497,8 @@ class PCCounts
double *counts;
#ifdef DEBUG
size_t capacity;
#elif JS_BITS_PER_WORD == 32
void *padding;
#endif
public:
@ -615,6 +617,9 @@ class PCCounts
}
};
/* Necessary for alignment with the script. */
JS_STATIC_ASSERT(sizeof(PCCounts) % sizeof(Value) == 0);
} /* namespace js */
#if defined(DEBUG)

1
js/src/jsscript.cpp
View File

@ -853,6 +853,7 @@ JSScript::initScriptCounts(JSContext *cx)
cursor += length * sizeof(PCCounts);
for (pc = code; pc < code + length; pc = next) {
JS_ASSERT(uintptr_t(cursor) % sizeof(double) == 0);
scriptCounts.pcCountsVector[pc - code].counts = (double *) cursor;
size_t capacity = PCCounts::numCounts(JSOp(*pc));
#ifdef DEBUG