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Bug 916564 - Move countFinalSourceNotes to a better place (r=jorendorff)

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--HG--
extra : rebase_source : c0b10f87f1e10499586fed2e4fa570edfcaaf510
This commit is contained in:
Luke Wagner 2014-01-17 17:39:02 -06:00
parent 44832b6251
commit 4ee663ce3c
2 changed files with 29 additions and 60 deletions
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55
js/src/frontend/BytecodeEmitter.cpp
View File

@ -6740,36 +6740,37 @@ SetSrcNoteOffset(ExclusiveContext *cx, BytecodeEmitter *bce, unsigned index, uns
return true;
}
#ifdef DEBUG_notme
#define DEBUG_srcnotesize
#endif
#ifdef DEBUG_srcnotesize
#define NBINS 10
static uint32_t hist[NBINS];
static void
DumpSrcNoteSizeHist()
/*
* Finish taking source notes in cx's notePool, copying final notes to the new
* stable store allocated by the caller and passed in via notes. Return false
* on malloc failure, which means this function reported an error.
*
* Use this to compute the number of jssrcnotes to allocate and pass in via
* notes. This method knows a lot about details of FinishTakingSrcNotes, so
* DON'T CHANGE js::frontend::FinishTakingSrcNotes WITHOUT CHECKING WHETHER
* THIS METHOD NEEDS CORRESPONDING CHANGES!
*/
ptrdiff_t
BytecodeEmitter::countFinalSourceNotes()
{
static FILE *fp;
int i, n;
if (!fp) {
fp = fopen("/tmp/srcnotes.hist", "w");
if (!fp)
return;
setvbuf(fp, nullptr, _IONBF, 0);
ptrdiff_t diff = prologOffset() - prolog.lastNoteOffset;
ptrdiff_t cnt = prolog.notes.length() + main.notes.length() + 1;
if (prolog.notes.length() && prolog.currentLine != firstLine) {
if (diff > SN_DELTA_MASK)
cnt += JS_HOWMANY(diff - SN_DELTA_MASK, SN_XDELTA_MASK);
cnt += 2 + ((firstLine > SN_3BYTE_OFFSET_MASK) << 1);
} else if (diff > 0) {
if (main.notes.length()) {
jssrcnote *sn = main.notes.begin();
diff -= SN_IS_XDELTA(sn)
? SN_XDELTA_MASK - (*sn & SN_XDELTA_MASK)
: SN_DELTA_MASK - (*sn & SN_DELTA_MASK);
}
if (diff > 0)
cnt += JS_HOWMANY(diff, SN_XDELTA_MASK);
}
fprintf(fp, "SrcNote size histogram:\n");
for (i = 0; i < NBINS; i++) {
fprintf(fp, "%4u %4u ", JS_BIT(i), hist[i]);
for (n = (int) JS_HOWMANY(hist[i], 10); n > 0; --n)
fputc('*', fp);
fputc('\n', fp);
}
fputc('\n', fp);
return cnt;
}
#endif
/*
* Fill in the storage at notes with prolog and main srcnotes; the space at

34
js/src/frontend/BytecodeEmitter.h
View File

@ -216,7 +216,7 @@ struct BytecodeEmitter
unsigned currentLine() const { return current->currentLine; }
unsigned lastColumn() const { return current->lastColumn; }
inline ptrdiff_t countFinalSourceNotes();
ptrdiff_t countFinalSourceNotes();
bool reportError(ParseNode *pn, unsigned errorNumber, ...);
bool reportStrictWarning(ParseNode *pn, unsigned errorNumber, ...);
@ -282,38 +282,6 @@ AddToSrcNoteDelta(ExclusiveContext *cx, BytecodeEmitter *bce, jssrcnote *sn, ptr
bool
FinishTakingSrcNotes(ExclusiveContext *cx, BytecodeEmitter *bce, jssrcnote *notes);
/*
* Finish taking source notes in cx's notePool, copying final notes to the new
* stable store allocated by the caller and passed in via notes. Return false
* on malloc failure, which means this function reported an error.
*
* Use this to compute the number of jssrcnotes to allocate and pass in via
* notes. This method knows a lot about details of FinishTakingSrcNotes, so
* DON'T CHANGE js::frontend::FinishTakingSrcNotes WITHOUT CHECKING WHETHER
* THIS METHOD NEEDS CORRESPONDING CHANGES!
*/
inline ptrdiff_t
BytecodeEmitter::countFinalSourceNotes()
{
ptrdiff_t diff = prologOffset() - prolog.lastNoteOffset;
ptrdiff_t cnt = prolog.notes.length() + main.notes.length() + 1;
if (prolog.notes.length() && prolog.currentLine != firstLine) {
if (diff > SN_DELTA_MASK)
cnt += JS_HOWMANY(diff - SN_DELTA_MASK, SN_XDELTA_MASK);
cnt += 2 + ((firstLine > SN_3BYTE_OFFSET_MASK) << 1);
} else if (diff > 0) {
if (main.notes.length()) {
jssrcnote *sn = main.notes.begin();
diff -= SN_IS_XDELTA(sn)
? SN_XDELTA_MASK - (*sn & SN_XDELTA_MASK)
: SN_DELTA_MASK - (*sn & SN_DELTA_MASK);
}
if (diff > 0)
cnt += JS_HOWMANY(diff, SN_XDELTA_MASK);
}
return cnt;
}
} /* namespace frontend */
} /* namespace js */