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Fix js_FinishTakingSrcNotes edge-case (bug 216320, r=shaver, a=asa).

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brendan%mozilla.org 2003-09-03 02:10:38 +00:00
parent f7b851cd87
commit 214fac7ac4
1 changed files with 20 additions and 6 deletions
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26
js/src/jsemit.c
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@ -4311,6 +4311,7 @@ js_FinishTakingSrcNotes(JSContext *cx, JSCodeGenerator *cg, jssrcnote *notes)
{
uintN prologCount, mainCount, totalCount;
ptrdiff_t offset, delta;
jssrcnote *sn;
JS_ASSERT(cg->current == &cg->main);
@ -4326,15 +4327,28 @@ js_FinishTakingSrcNotes(JSContext *cx, JSCodeGenerator *cg, jssrcnote *notes)
* Either no prolog srcnotes, or no line number change over prolog.
* We don't need a SRC_SETLINE, but we may need to adjust the offset
* of the first main note, by adding to its delta and possibly even
* prepending SRC_XDELTA notes to it to account for prolog bytes.
* prepending SRC_XDELTA notes to it to account for prolog bytecodes
* that came at and after the last annotated bytecode.
*/
offset = CG_PROLOG_OFFSET(cg) - cg->prolog.lastNoteOffset;
JS_ASSERT(offset >= 0);
while (offset > 0) {
delta = JS_MIN(offset, SN_XDELTA_MASK);
if (!js_AddToSrcNoteDelta(cx, cg, cg->main.notes, delta))
return JS_FALSE;
offset -= delta;
if (offset > 0) {
/* NB: Use as much of the first main note's delta as we can. */
sn = cg->main.notes;
delta = SN_IS_XDELTA(sn)
? SN_XDELTA_MASK - (*sn & SN_XDELTA_MASK)
: SN_DELTA_MASK - (*sn & SN_DELTA_MASK);
if (offset < delta)
delta = offset;
for (;;) {
if (!js_AddToSrcNoteDelta(cx, cg, sn, delta))
return JS_FALSE;
offset -= delta;
if (offset == 0)
break;
delta = JS_MIN(offset, SN_XDELTA_MASK);
sn = cg->main.notes;
}
}
}