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[DWARF parser] Respect address ranges specified in compile unit DIE.

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When address ranges for compile unit are specified in compile unit DIE
itself, there is no need to collect ranges from children subprogram DIEs.

This change speeds up llvm-symbolizer on Clang-produced binaries with
full debug info. For instance, symbolizing a first address in a 1Gb binary
is now 2x faster (1s vs. 2s).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206641 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alexey Samsonov 2014-04-18 20:30:27 +00:00
parent 561edae834
commit 4387550026
1 changed files with 7 additions and 0 deletions
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7
lib/DebugInfo/DWARFUnit.cpp
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@ -299,6 +299,13 @@ void DWARFUnit::clearDIEs(bool KeepCUDie) {
}
void DWARFUnit::collectAddressRanges(DWARFAddressRangesVector &CURanges) {
// First, check if CU DIE describes address ranges for the unit.
const auto &CUDIERanges = getCompileUnitDIE()->getAddressRanges(this);
if (!CUDIERanges.empty()) {
CURanges.insert(CURanges.end(), CUDIERanges.begin(), CUDIERanges.end());
return;
}
// This function is usually called if there in no .debug_aranges section
// in order to produce a compile unit level set of address ranges that
// is accurate. If the DIEs weren't parsed, then we don't want all dies for