[obj2yaml] Support ELF input format in the obj2yaml tool.
The ELF header e_flags field in the MIPS related test cases handled
incorrectly. The obj2yaml prints too many flags. I will fix that in the
next patches.
The patch reviewed by Michael Spencer and Sean Silva.
llvm-svn: 208752
diff --git a/llvm/tools/obj2yaml/elf2yaml.cpp b/llvm/tools/obj2yaml/elf2yaml.cpp
new file mode 100644
index 0000000..38afa138
--- /dev/null
+++ b/llvm/tools/obj2yaml/elf2yaml.cpp
@@ -0,0 +1,289 @@
+//===------ utils/elf2yaml.cpp - obj2yaml conversion tool -------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "Error.h"
+#include "obj2yaml.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/Object/ELFObjectFile.h"
+#include "llvm/Object/ELFYAML.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/YAMLTraits.h"
+
+using namespace llvm;
+
+namespace {
+
+template <class ELFT>
+class ELFDumper {
+ typedef typename object::ELFFile<ELFT>::Elf_Shdr Elf_Shdr;
+ typedef typename object::ELFFile<ELFT>::Elf_Sym_Iter Elf_Sym_Iter;
+
+ const object::ELFFile<ELFT> &Obj;
+
+ error_code dumpSymbol(Elf_Sym_Iter Sym, ELFYAML::Symbol &S);
+ error_code dumpCommonSection(const Elf_Shdr *Shdr, ELFYAML::Section &S);
+ template <class RelT>
+ error_code dumpRelocation(const Elf_Shdr *Shdr, const RelT *Rel,
+ ELFYAML::Relocation &R);
+
+ ErrorOr<ELFYAML::RelocationSection *> dumpRelSection(const Elf_Shdr *Shdr);
+ ErrorOr<ELFYAML::RelocationSection *> dumpRelaSection(const Elf_Shdr *Shdr);
+ ErrorOr<ELFYAML::RawContentSection *>
+ dumpContentSection(const Elf_Shdr *Shdr);
+
+public:
+ ELFDumper(const object::ELFFile<ELFT> &O);
+ ErrorOr<ELFYAML::Object *> dump();
+};
+
+}
+
+template <class ELFT>
+ELFDumper<ELFT>::ELFDumper(const object::ELFFile<ELFT> &O)
+ : Obj(O) {}
+
+template <class ELFT>
+ErrorOr<ELFYAML::Object *> ELFDumper<ELFT>::dump() {
+ auto Y = make_unique<ELFYAML::Object>();
+
+ // Dump header
+ Y->Header.Class = ELFYAML::ELF_ELFCLASS(Obj.getHeader()->getFileClass());
+ Y->Header.Data = ELFYAML::ELF_ELFDATA(Obj.getHeader()->getDataEncoding());
+ Y->Header.OSABI = Obj.getHeader()->e_ident[ELF::EI_OSABI];
+ Y->Header.Type = Obj.getHeader()->e_type;
+ Y->Header.Machine = Obj.getHeader()->e_machine;
+ Y->Header.Flags = Obj.getHeader()->e_flags;
+ Y->Header.Entry = Obj.getHeader()->e_entry;
+
+ // Dump sections
+ for (const Elf_Shdr &Sec : Obj.sections()) {
+ switch (Sec.sh_type) {
+ case ELF::SHT_NULL:
+ case ELF::SHT_SYMTAB:
+ case ELF::SHT_DYNSYM:
+ case ELF::SHT_STRTAB:
+ // Do not dump these sections.
+ break;
+ case ELF::SHT_RELA: {
+ ErrorOr<ELFYAML::RelocationSection *> S = dumpRelaSection(&Sec);
+ if (error_code EC = S.getError())
+ return EC;
+ Y->Sections.push_back(std::unique_ptr<ELFYAML::Section>(S.get()));
+ break;
+ }
+ case ELF::SHT_REL: {
+ ErrorOr<ELFYAML::RelocationSection *> S = dumpRelSection(&Sec);
+ if (error_code EC = S.getError())
+ return EC;
+ Y->Sections.push_back(std::unique_ptr<ELFYAML::Section>(S.get()));
+ break;
+ }
+ default: {
+ ErrorOr<ELFYAML::RawContentSection *> S = dumpContentSection(&Sec);
+ if (error_code EC = S.getError())
+ return EC;
+ Y->Sections.push_back(std::unique_ptr<ELFYAML::Section>(S.get()));
+ }
+ }
+ }
+
+ // Dump symbols
+ bool IsFirstSym = true;
+ for (auto SI = Obj.begin_symbols(), SE = Obj.end_symbols(); SI != SE; ++SI) {
+ if (IsFirstSym) {
+ IsFirstSym = false;
+ continue;
+ }
+
+ ELFYAML::Symbol S;
+ if (error_code EC = ELFDumper<ELFT>::dumpSymbol(SI, S))
+ return EC;
+
+ switch (SI->getBinding())
+ {
+ case ELF::STB_LOCAL:
+ Y->Symbols.Local.push_back(S);
+ break;
+ case ELF::STB_GLOBAL:
+ Y->Symbols.Global.push_back(S);
+ break;
+ case ELF::STB_WEAK:
+ Y->Symbols.Weak.push_back(S);
+ break;
+ default:
+ llvm_unreachable("Unknown ELF symbol binding");
+ }
+ }
+
+ return Y.release();
+}
+
+template <class ELFT>
+error_code ELFDumper<ELFT>::dumpSymbol(Elf_Sym_Iter Sym, ELFYAML::Symbol &S) {
+ S.Type = Sym->getType();
+ S.Value = Sym->st_value;
+ S.Size = Sym->st_size;
+
+ ErrorOr<StringRef> NameOrErr = Obj.getSymbolName(Sym);
+ if (error_code EC = NameOrErr.getError())
+ return EC;
+ S.Name = NameOrErr.get();
+
+ const Elf_Shdr *Shdr = Obj.getSection(&*Sym);
+ if (!Shdr)
+ return obj2yaml_error::success;
+
+ NameOrErr = Obj.getSectionName(Shdr);
+ if (error_code EC = NameOrErr.getError())
+ return EC;
+ S.Section = NameOrErr.get();
+
+ return obj2yaml_error::success;
+}
+
+template <class ELFT>
+template <class RelT>
+error_code ELFDumper<ELFT>::dumpRelocation(const Elf_Shdr *Shdr,
+ const RelT *Rel,
+ ELFYAML::Relocation &R) {
+ R.Type = Rel->getType(Obj.isMips64EL());
+ R.Offset = Rel->r_offset;
+ R.Addend = 0;
+
+ auto NamePair = Obj.getRelocationSymbol(Shdr, Rel);
+ if (!NamePair.first)
+ return obj2yaml_error::success;
+
+ ErrorOr<StringRef> NameOrErr =
+ Obj.getSymbolName(NamePair.first, NamePair.second);
+ if (error_code EC = NameOrErr.getError())
+ return EC;
+ R.Symbol = NameOrErr.get();
+
+ return obj2yaml_error::success;
+}
+
+template <class ELFT>
+error_code ELFDumper<ELFT>::dumpCommonSection(const Elf_Shdr *Shdr,
+ ELFYAML::Section &S) {
+ S.Type = Shdr->sh_type;
+ S.Flags = Shdr->sh_flags;
+ S.Address = Shdr->sh_addr;
+ S.AddressAlign = Shdr->sh_addralign;
+
+ ErrorOr<StringRef> NameOrErr = Obj.getSectionName(Shdr);
+ if (error_code EC = NameOrErr.getError())
+ return EC;
+ S.Name = NameOrErr.get();
+
+ if (Shdr->sh_link != ELF::SHN_UNDEF) {
+ if (const Elf_Shdr *LinkSection = Obj.getSection(Shdr->sh_link)) {
+ NameOrErr = Obj.getSectionName(LinkSection);
+ if (error_code EC = NameOrErr.getError())
+ return EC;
+ S.Link = NameOrErr.get();
+ }
+ }
+ if (Shdr->sh_info != ELF::SHN_UNDEF) {
+ if (const Elf_Shdr *InfoSection = Obj.getSection(Shdr->sh_info)) {
+ NameOrErr = Obj.getSectionName(InfoSection);
+ if (error_code EC = NameOrErr.getError())
+ return EC;
+ S.Info = NameOrErr.get();
+ }
+ }
+ return obj2yaml_error::success;
+}
+
+template <class ELFT>
+ErrorOr<ELFYAML::RelocationSection *>
+ELFDumper<ELFT>::dumpRelSection(const Elf_Shdr *Shdr) {
+ assert(Shdr->sh_type == ELF::SHT_REL && "Section type is not SHT_REL");
+ auto S = make_unique<ELFYAML::RelocationSection>();
+
+ if (error_code EC = dumpCommonSection(Shdr, *S))
+ return EC;
+
+ for (auto RI = Obj.begin_rel(Shdr), RE = Obj.end_rel(Shdr); RI != RE;
+ ++RI) {
+ ELFYAML::Relocation R;
+ if (error_code EC = dumpRelocation(Shdr, &*RI, R))
+ return EC;
+ S->Relocations.push_back(R);
+ }
+
+ return S.release();
+}
+
+template <class ELFT>
+ErrorOr<ELFYAML::RelocationSection *>
+ELFDumper<ELFT>::dumpRelaSection(const Elf_Shdr *Shdr) {
+ assert(Shdr->sh_type == ELF::SHT_RELA && "Section type is not SHT_RELA");
+ auto S = make_unique<ELFYAML::RelocationSection>();
+
+ if (error_code EC = dumpCommonSection(Shdr, *S))
+ return EC;
+
+ for (auto RI = Obj.begin_rela(Shdr), RE = Obj.end_rela(Shdr); RI != RE;
+ ++RI) {
+ ELFYAML::Relocation R;
+ if (error_code EC = dumpRelocation(Shdr, &*RI, R))
+ return EC;
+ R.Addend = RI->r_addend;
+ S->Relocations.push_back(R);
+ }
+
+ return S.release();
+}
+
+template <class ELFT>
+ErrorOr<ELFYAML::RawContentSection *>
+ELFDumper<ELFT>::dumpContentSection(const Elf_Shdr *Shdr) {
+ auto S = make_unique<ELFYAML::RawContentSection>();
+
+ if (error_code EC = dumpCommonSection(Shdr, *S))
+ return EC;
+
+ ErrorOr<ArrayRef<uint8_t>> ContentOrErr = Obj.getSectionContents(Shdr);
+ if (error_code EC = ContentOrErr.getError())
+ return EC;
+ S->Content = object::yaml::BinaryRef(ContentOrErr.get());
+
+ return S.release();
+}
+
+template <class ELFT>
+static error_code elf2yaml(raw_ostream &Out, const object::ELFFile<ELFT> &Obj) {
+ ELFDumper<ELFT> Dumper(Obj);
+ ErrorOr<ELFYAML::Object *> YAMLOrErr = Dumper.dump();
+ if (error_code EC = YAMLOrErr.getError())
+ return EC;
+
+ std::unique_ptr<ELFYAML::Object> YAML(YAMLOrErr.get());
+ yaml::Output Yout(Out);
+ Yout << *YAML;
+
+ return object::object_error::success;
+}
+
+error_code elf2yaml(raw_ostream &Out, const object::ObjectFile &Obj) {
+ if (const auto *ELFObj = dyn_cast<object::ELF32LEObjectFile>(&Obj))
+ return elf2yaml(Out, *ELFObj->getELFFile());
+
+ if (const auto *ELFObj = dyn_cast<object::ELF32BEObjectFile>(&Obj))
+ return elf2yaml(Out, *ELFObj->getELFFile());
+
+ if (const auto *ELFObj = dyn_cast<object::ELF64LEObjectFile>(&Obj))
+ return elf2yaml(Out, *ELFObj->getELFFile());
+
+ if (const auto *ELFObj = dyn_cast<object::ELF64BEObjectFile>(&Obj))
+ return elf2yaml(Out, *ELFObj->getELFFile());
+
+ return obj2yaml_error::unsupported_obj_file_format;
+}