bool
GeneratedSourceMap::searchLineByOffset(JSContext* cx, uint32_t offset, size_t* exprlocIndex)
{
MOZ_ASSERT(!exprlocs_.empty());
size_t exprlocsLength = exprlocs_.length();
// Lazily build sorted array for fast log(n) lookup.
if (!sortedByOffsetExprLocIndices_) {
ExprLocIndexVector scratch;
auto indices = MakeUnique<ExprLocIndexVector>();
if (!indices || !indices->resize(exprlocsLength) || !scratch.resize(exprlocsLength)) {
ReportOutOfMemory(cx);
return false;
}
sortedByOffsetExprLocIndices_ = Move(indices);
for (size_t i = 0; i < exprlocsLength; i++)
(*sortedByOffsetExprLocIndices_)[i] = i;
auto compareExprLocViaIndex = [&](uint32_t i, uint32_t j, bool* lessOrEqualp) -> bool {
*lessOrEqualp = exprlocs_[i].offset <= exprlocs_[j].offset;
return true;
};
MOZ_ALWAYS_TRUE(MergeSort(sortedByOffsetExprLocIndices_->begin(), exprlocsLength,
scratch.begin(), compareExprLocViaIndex));
}
// Allowing non-exact search and if BinarySearchIf returns out-of-bound
// index, moving the index to the last index.
auto lookupFn = [&](uint32_t i) -> int {
const ExprLoc& loc = exprlocs_[i];
return offset == loc.offset ? 0 : offset < loc.offset ? -1 : 1;
};
size_t match;
Unused << BinarySearchIf(sortedByOffsetExprLocIndices_->begin(), 0, exprlocsLength, lookupFn, &match);
if (match >= exprlocsLength)
match = exprlocsLength - 1;
*exprlocIndex = (*sortedByOffsetExprLocIndices_)[match];
return true;
}
int32_t
gfxMathTable::GetCoverageIndex(const Coverage* aCoverage, uint32_t aGlyph)
{
using mozilla::BinarySearch;
using mozilla::BinarySearchIf;
if (uint16_t(aCoverage->mFormat) == 1) {
// Coverage Format 1: list of individual glyph indices in the glyph set.
const CoverageFormat1* table =
reinterpret_cast<const CoverageFormat1*>(aCoverage);
const uint16_t count = table->mGlyphCount;
const char* start = reinterpret_cast<const char*>(table + 1);
if (ValidStructure(start, count * sizeof(GlyphID))) {
const GlyphID* glyphArray = reinterpret_cast<const GlyphID*>(start);
size_t index;
if (BinarySearch(GlyphArrayWrapper(glyphArray), 0, count, aGlyph, &index)) {
return index;
}
}
} else if (uint16_t(aCoverage->mFormat) == 2) {
// Coverage Format 2: ranges of consecutive indices.
const CoverageFormat2* table =
reinterpret_cast<const CoverageFormat2*>(aCoverage);
const uint16_t count = table->mRangeCount;
const char* start = reinterpret_cast<const char*>(table + 1);
if (ValidStructure(start, count * sizeof(RangeRecord))) {
const RangeRecord* rangeArray = reinterpret_cast<const RangeRecord*>(start);
size_t index;
if (BinarySearchIf(rangeArray, 0, count, RangeRecordComparator(aGlyph),
&index)) {
uint16_t rStart = rangeArray[index].mStart;
uint16_t startCoverageIndex = rangeArray[index].mStartCoverageIndex;
return (startCoverageIndex + aGlyph - rStart);
}
}
}
return -1;
}
bool
DebugState::getLineOffsets(JSContext* cx, size_t lineno, Vector<uint32_t>* offsets)
{
if (!debugEnabled())
return true;
if (binarySource_) {
const CallSite* callsite = SlowCallSiteSearchByOffset(metadata(Tier::Debug), lineno);
if (callsite && !offsets->append(lineno))
return false;
return true;
}
if (!ensureSourceMap(cx))
return false;
if (!maybeSourceMap_)
return true; // no source text available, keep offsets empty.
ExprLocVector& exprlocs = maybeSourceMap_->exprlocs();
// Binary search for the expression with the specified line number and
// rewind to the first expression, if more than one expression on the same line.
size_t match;
if (!BinarySearchIf(exprlocs, 0, exprlocs.length(), LineComparator(lineno), &match))
return true;
while (match > 0 && exprlocs[match - 1].lineno == lineno)
match--;
// Return all expression offsets that were printed on the specified line.
for (size_t i = match; i < exprlocs.length() && exprlocs[i].lineno == lineno; i++) {
if (!offsets->append(exprlocs[i].offset))
return false;
}
return true;
}
