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[llvm-objdump] - Simplify the getRelocationValueString. NFCI. 

This refactors the getRelocationValueString method.
It is a bit overcomplicated and it is possible to reduce it without
losing the functionality it seems.

Differential revision: https://reviews.llvm.org/D56778

llvm-svn: 351417
This commit is contained in:
George Rimar 2019-01-17 09:13:17 +00:00
parent ee61308595
commit 6ce6bfa435
1 changed files with 22 additions and 38 deletions
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60
llvm/tools/llvm-objdump/llvm-objdump.cpp
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@ -491,44 +491,32 @@ static std::error_code getRelocationValueString(const ELFObjectFile<ELFT> *Obj,
auto SecOrErr = EF.getSection(Rel.d.a);
if (!SecOrErr)
return errorToErrorCode(SecOrErr.takeError());
const Elf_Shdr *Sec = *SecOrErr;
auto SymTabOrErr = EF.getSection(Sec->sh_link);
if (!SymTabOrErr)
return errorToErrorCode(SymTabOrErr.takeError());
const Elf_Shdr *SymTab = *SymTabOrErr;
assert(SymTab->sh_type == ELF::SHT_SYMTAB ||
SymTab->sh_type == ELF::SHT_DYNSYM);
auto StrTabSec = EF.getSection(SymTab->sh_link);
if (!StrTabSec)
return errorToErrorCode(StrTabSec.takeError());
auto StrTabOrErr = EF.getStringTable(*StrTabSec);
if (!StrTabOrErr)
return errorToErrorCode(StrTabOrErr.takeError());
StringRef StrTab = *StrTabOrErr;
int64_t Addend = 0;
// If there is no Symbol associated with the relocation, we set the undef
// boolean value to 'true'. This will prevent us from calling functions that
// requires the relocation to be associated with a symbol.
//
// In SHT_REL case we would need to read the addend from section data.
// GNU objdump does not do that and we just follow for simplicity atm.
bool Undef = false;
switch (Sec->sh_type) {
default:
return object_error::parse_failed;
case ELF::SHT_REL: {
// TODO: Read implicit addend from section data.
break;
}
case ELF::SHT_RELA: {
if ((*SecOrErr)->sh_type == ELF::SHT_RELA) {
const Elf_Rela *ERela = Obj->getRela(Rel);
Addend = ERela->r_addend;
Undef = ERela->getSymbol(false) == 0;
break;
} else if ((*SecOrErr)->sh_type != ELF::SHT_REL) {
return object_error::parse_failed;
}
}
std::string Target;
// Default scheme is to print Target, as well as "+ <addend>" for nonzero
// addend. Should be acceptable for all normal purposes.
std::string FmtBuf;
raw_string_ostream Fmt(FmtBuf);
if (!Undef) {
symbol_iterator SI = RelRef.getSymbol();
const Elf_Sym *symb = Obj->getSymbol(SI->getRawDataRefImpl());
if (symb->getType() == ELF::STT_SECTION) {
const Elf_Sym *Sym = Obj->getSymbol(SI->getRawDataRefImpl());
if (Sym->getType() == ELF::STT_SECTION) {
Expected<section_iterator> SymSI = SI->getSection();
if (!SymSI)
return errorToErrorCode(SymSI.takeError());
@ -536,24 +524,20 @@ static std::error_code getRelocationValueString(const ELFObjectFile<ELFT> *Obj,
auto SecName = EF.getSectionName(SymSec);
if (!SecName)
return errorToErrorCode(SecName.takeError());
Target = *SecName;
Fmt << *SecName;
} else {
Expected<StringRef> SymName = symb->getName(StrTab);
Expected<StringRef> SymName = SI->getName();
if (!SymName)
return errorToErrorCode(SymName.takeError());
if (Demangle)
Target = demangle(*SymName);
Fmt << demangle(*SymName);
else
Target = *SymName;
Fmt << *SymName;
}
} else {
Fmt << "*ABS*";
}
} else
Target = "*ABS*";
// Default scheme is to print Target, as well as "+ <addend>" for nonzero
// addend. Should be acceptable for all normal purposes.
std::string FmtBuf;
raw_string_ostream Fmt(FmtBuf);
Fmt << Target;
if (Addend != 0)
Fmt << (Addend < 0 ? "" : "+") << Addend;
Fmt.flush();