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dwarfdump: Improve performance on large DWP files 

llvm-svn: 342099
This commit is contained in:
David Blaikie 2018-09-12 23:39:51 +00:00
parent 56dd0d2cfd
commit da36f3f482
3 changed files with 29 additions and 8 deletions
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7
llvm/include/llvm/ADT/STLExtras.h
View File

@ -1130,6 +1130,13 @@ auto lower_bound(R &&Range, ForwardIt I) -> decltype(adl_begin(Range)) {
return std::lower_bound(adl_begin(Range), adl_end(Range), I);
}
/// Provide wrappers to std::upper_bound which take ranges instead of having to
/// pass begin/end explicitly.
template <typename R, typename ForwardIt>
auto upper_bound(R &&Range, ForwardIt I) -> decltype(adl_begin(Range)) {
return std::upper_bound(adl_begin(Range), adl_end(Range), I);
}
/// Wrapper function around std::equal to detect if all elements
/// in a container are same.
template <typename R>

1
llvm/include/llvm/DebugInfo/DWARF/DWARFUnitIndex.h
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@ -74,6 +74,7 @@ private:
int InfoColumn = -1;
std::unique_ptr<DWARFSectionKind[]> ColumnKinds;
std::unique_ptr<Entry[]> Rows;
mutable std::vector<Entry *> OffsetLookup;
static StringRef getColumnHeader(DWARFSectionKind DS);

23
llvm/lib/DebugInfo/DWARF/DWARFUnitIndex.cpp
View File

@ -164,14 +164,27 @@ DWARFUnitIndex::Entry::getOffset() const {
const DWARFUnitIndex::Entry *
DWARFUnitIndex::getFromOffset(uint32_t Offset) const {
if (OffsetLookup.empty()) {
for (uint32_t i = 0; i != Header.NumBuckets; ++i)
if (const auto &Contribs = Rows[i].Contributions) {
const auto &InfoContrib = Contribs[InfoColumn];
if (InfoContrib.Offset <= Offset &&
Offset < (InfoContrib.Offset + InfoContrib.Length))
return &Rows[i];
if (const auto &Contribs = Rows[i].Contributions)
OffsetLookup.push_back(&Rows[i]);
llvm::sort(OffsetLookup, [&](Entry *E1, Entry *E2) {
return E1->Contributions[InfoColumn].Offset <
E2->Contributions[InfoColumn].Offset;
});
}
auto I =
llvm::upper_bound(OffsetLookup, Offset, [&](uint32_t Offset, Entry *E2) {
return Offset < E2->Contributions[InfoColumn].Offset;
});
if (I == OffsetLookup.begin())
return nullptr;
--I;
const auto *E = *I;
const auto &InfoContrib = E->Contributions[InfoColumn];
if ((InfoContrib.Offset + InfoContrib.Length) <= Offset)
return nullptr;
return E;
}
const DWARFUnitIndex::Entry *DWARFUnitIndex::getFromHash(uint64_t S) const {