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Simplify BinaryFile::parse and add comments.

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llvm-svn: 301514
This commit is contained in:
Rui Ueyama 2017-04-27 04:01:36 +00:00
parent 63d48e5956
commit c9d82b9e16
2 changed files with 22 additions and 19 deletions
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37
lld/ELF/InputFiles.cpp
View File

@ -883,30 +883,29 @@ static ELFKind getELFKind(MemoryBufferRef MB) {
}
template <class ELFT> void BinaryFile::parse() {
StringRef Buf = MB.getBuffer();
ArrayRef<uint8_t> Data =
makeArrayRef<uint8_t>((const uint8_t *)Buf.data(), Buf.size());
std::string Filename = MB.getBufferIdentifier();
std::transform(Filename.begin(), Filename.end(), Filename.begin(),
[](char C) { return isalnum(C) ? C : '_'; });
Filename = "_binary_" + Filename;
StringRef StartName = Saver.save(Filename + "_start");
StringRef EndName = Saver.save(Filename + "_end");
StringRef SizeName = Saver.save(Filename + "_size");
ArrayRef<uint8_t> Data = toArrayRef(MB.getBuffer());
auto *Section =
make<InputSection>(SHF_ALLOC | SHF_WRITE, SHT_PROGBITS, 8, Data, ".data");
Sections.push_back(Section);
elf::Symtab<ELFT>::X->addRegular(StartName, STV_DEFAULT, STT_OBJECT, 0, 0,
STB_GLOBAL, Section, nullptr);
elf::Symtab<ELFT>::X->addRegular(EndName, STV_DEFAULT, STT_OBJECT,
Data.size(), 0, STB_GLOBAL, Section,
nullptr);
elf::Symtab<ELFT>::X->addRegular(SizeName, STV_DEFAULT, STT_OBJECT,
Data.size(), 0, STB_GLOBAL, nullptr,
// For each input file foo that is embedded to a result as a binary
// blob, we define _binary_foo_{start,end,size} symbols, so that
// user programs can access blobs by name. Non-alphanumeric
// characters in a filename are replaced with underscore.
std::string S = "_binary_" + MB.getBufferIdentifier().str();
for (size_t I = 0; I < S.size(); ++I)
if (!isalnum(S[I]))
S[I] = '_';
elf::Symtab<ELFT>::X->addRegular(Saver.save(S + "_start"), STV_DEFAULT,
STT_OBJECT, 0, 0, STB_GLOBAL, Section,
nullptr);
elf::Symtab<ELFT>::X->addRegular(Saver.save(S + "_end"), STV_DEFAULT,
STT_OBJECT, Data.size(), 0, STB_GLOBAL,
Section, nullptr);
elf::Symtab<ELFT>::X->addRegular(Saver.save(S + "_size"), STV_DEFAULT,
STT_OBJECT, Data.size(), 0, STB_GLOBAL,
nullptr, nullptr);
}
static bool isBitcode(MemoryBufferRef MB) {

4
lld/ELF/Strings.h
View File

@ -76,6 +76,10 @@ llvm::Optional<std::string> demangle(StringRef Name);
inline StringRef toStringRef(ArrayRef<uint8_t> Arr) {
return {(const char *)Arr.data(), Arr.size()};
}
inline ArrayRef<uint8_t> toArrayRef(StringRef S) {
return {(const uint8_t *)S.data(), S.size()};
}
}
}