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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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include/llvm/Target/ELFTargetAsmInfo.h
+1 -1
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@@ -27,7 +27,7 @@ namespace llvm {
explicit ELFTargetAsmInfo(const TargetMachine &TM);
virtual const Section* SelectSectionForGlobal(const GlobalValue *GV) const;
virtual std::string PrintSectionFlags(unsigned flags) const;
virtual std::string printSectionFlags(unsigned flags) const;
const Section* MergeableConstSection(const GlobalVariable *GV) const;
inline const Section* MergeableConstSection(const Type *Ty) const;
const Section* MergeableStringSection(const GlobalVariable *GV) const;
include/llvm/Target/TargetAsmInfo.h
+14 -1
View File
@@ -16,6 +16,7 @@
#ifndef LLVM_TARGET_ASM_INFO_H
#define LLVM_TARGET_ASM_INFO_H
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/Support/DataTypes.h"
#include <string>
@@ -83,6 +84,16 @@ namespace llvm {
static inline unsigned setEntitySize(unsigned Flags, unsigned Size) {
return ((Flags & ~EntitySize) | ((Size & 0xFF) << 24));
}
struct KeyInfo {
static inline unsigned getEmptyKey() { return Invalid; }
static inline unsigned getTombstoneKey() { return Invalid - 1; }
static unsigned getHashValue(const unsigned &Key) { return Key; }
static bool isEqual(unsigned LHS, unsigned RHS) { return LHS == RHS; }
static bool isPod() { return true; }
};
typedef DenseMap<unsigned, std::string, KeyInfo> FlagsStringsMapType;
}
class TargetMachine;
@@ -109,6 +120,7 @@ namespace llvm {
class TargetAsmInfo {
private:
mutable StringMap<Section> Sections;
mutable SectionFlags::FlagsStringsMapType FlagsStrings;
protected:
//===------------------------------------------------------------------===//
// Properties to be set by the target writer, used to configure asm printer.
@@ -551,7 +563,8 @@ namespace llvm {
virtual std::string UniqueSectionForGlobal(const GlobalValue* GV,
SectionKind::Kind kind) const;
virtual std::string PrintSectionFlags(unsigned flags) const { return ""; }
const std::string& getSectionFlags(unsigned Flags) const;
virtual std::string printSectionFlags(unsigned flags) const { return ""; }
virtual const Section* SelectSectionForGlobal(const GlobalValue *GV) const;