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Reduce heap trashing due to std::string construction / concatenation via caching of section flags string representations

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54842 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anton Korobeynikov
2008-08-16 12:57:07 +00:00
parent 7c856c09cd
commit d0c1e29aec
8 changed files with 35 additions and 9 deletions
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15
lib/Target/TargetAsmInfo.cpp
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@@ -291,7 +291,7 @@ TargetAsmInfo::SectionForGlobal(const GlobalValue *GV) const {
// If section is named we need to switch into it via special '.section'
// directive and also append funky flags. Otherwise - section name is just
// some magic assembler directive.
return getSwitchToSectionDirective() + S->Name + PrintSectionFlags(S->Flags);
return getSwitchToSectionDirective() + S->Name + getSectionFlags(S->Flags);
}
// Lame default implementation. Calculate the section name for global.
@@ -376,3 +376,16 @@ TargetAsmInfo::getUnnamedSection(const char *Directive, unsigned Flags) const {
return &S;
}
const std::string&
TargetAsmInfo::getSectionFlags(unsigned Flags) const {
SectionFlags::FlagsStringsMapType::iterator I = FlagsStrings.find(Flags);
// We didn't print these flags yet, print and save them to map. This reduces
// amount of heap trashing due to std::string construction / concatenation.
if (I == FlagsStrings.end())
I = FlagsStrings.insert(std::make_pair(Flags,
printSectionFlags(Flags))).first;
return I->second;
}