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Don't allocate temporary string for section data.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183040 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola
2013-05-31 20:26:44 +00:00
parent 47afc19625
commit 05bc4a6f20
4 changed files with 61 additions and 27 deletions
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34
include/llvm/Object/COFFYaml.h
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@ -36,10 +36,34 @@ inline SectionCharacteristics operator|(SectionCharacteristics a,
// The structure of the yaml files is not an exact 1:1 match to COFF. In order
// to use yaml::IO, we use these structures which are closer to the source.
namespace COFFYAML {
/// In an object file this is just a binary blob. In an yaml file it is an hex
/// string. Using this avoid having to allocate temporary strings.
/// FIXME: not COFF specific.
class BinaryRef {
union {
ArrayRef<uint8_t> BinaryData;
StringRef HexData;
};
bool isBinary;
public:
BinaryRef(ArrayRef<uint8_t> BinaryData)
: BinaryData(BinaryData), isBinary(true) {}
BinaryRef(StringRef HexData) : HexData(HexData), isBinary(false) {}
BinaryRef() : isBinary(false) {}
StringRef getHex() const {
assert(!isBinary);
return HexData;
}
ArrayRef<uint8_t> getBinary() const {
assert(isBinary);
return BinaryData;
}
};
struct Section {
COFF::section Header;
unsigned Alignment;
StringRef SectionData;
BinaryRef SectionData;
std::vector<COFF::relocation> Relocations;
StringRef Name;
Section();
@ -49,7 +73,7 @@ namespace COFFYAML {
COFF::symbol Header;
COFF::SymbolBaseType SimpleType;
COFF::SymbolComplexType ComplexType;
StringRef AuxiliaryData;
BinaryRef AuxiliaryData;
StringRef Name;
Symbol();
};
@ -70,6 +94,12 @@ LLVM_YAML_IS_SEQUENCE_VECTOR(COFF::relocation)
namespace llvm {
namespace yaml {
template<>
struct ScalarTraits<COFFYAML::BinaryRef> {
static void output(const COFFYAML::BinaryRef &, void*, llvm::raw_ostream &);
static StringRef input(StringRef, void*, COFFYAML::BinaryRef &);
};
template <>
struct ScalarEnumerationTraits<COFF::MachineTypes> {
static void enumeration(IO &IO, COFF::MachineTypes &Value);