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[llvm-readelf/obj] - Improve error reporting when dumping group sections.
Our code that dumps groups has 3 noticeable issues: 1) It uses `unwrapOrError` in many places. 2) It doesn't allow reporting unique warnings, because the `getGroups` helper is not a member of `DumpStyle<ELFT>`. 3) It might just crash. See the comment for `StrTableOrErr->data() + Sym.st_name` line. In this patch I am starting addressing these points. For start I've converted one of `unwrapOrError` calls to a unique warning. Differential revision: https://reviews.llvm.org/D91798
This commit is contained in:
Georgii Rymar
parent
55fbb7e6c9
commit
78b3f55aa0
@ -74,6 +74,9 @@ Sections:
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Type: SHT_RELA
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Link: .symtab
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Info: .text.bar
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- Name: .symtab
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Type: SHT_SYMTAB
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Link: [[SYMTABLINK=.strtab]]
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Symbols:
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- Name: foo
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Section: .text.foo
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@ -123,3 +126,49 @@ Symbols:
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# DUP-GNU-NEXT: warning: '[[FILE]]': section with index 3, included in the group section with index 1, was also found in the group section with index 2
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# DUP-GNU-NEXT: [ 3] .text.foo
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# DUP-GNU-NEXT: [ 6] .rela.text.bar
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# RUN: yaml2obj %s -DSYMTABLINK=0xFF -o %t.symtab.o
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# RUN: llvm-readobj --elf-section-groups %t.symtab.o 2>&1 | \
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# RUN: FileCheck -DFILE=%t.symtab.o %s --check-prefix=SYMTAB-LLVM --implicit-check-not=warning:
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# RUN: llvm-readelf --elf-section-groups %t.symtab.o 2>&1 | \
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# RUN: FileCheck -DFILE=%t.symtab.o %s --check-prefix=SYMTAB-GNU --implicit-check-not=warning:
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# SYMTAB-LLVM: Groups {
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# SYMTAB-LLVM-NEXT: warning: '[[FILE]]': unable to get the string table for SHT_SYMTAB section with index 7: invalid section index: 255
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# SYMTAB-LLVM-NEXT: Group {
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# SYMTAB-LLVM-NEXT: Name: .group (16)
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# SYMTAB-LLVM-NEXT: Index: 1
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# SYMTAB-LLVM-NEXT: Link: 7
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# SYMTAB-LLVM-NEXT: Info: 1
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# SYMTAB-LLVM-NEXT: Type: COMDAT (0x1)
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# SYMTAB-LLVM-NEXT: Signature: <?>
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# SYMTAB-LLVM-NEXT: Section(s) in group [
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# SYMTAB-LLVM-NEXT: .text.foo (3)
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# SYMTAB-LLVM-NEXT: .rela.text.foo (4)
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# SYMTAB-LLVM-NEXT: ]
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# SYMTAB-LLVM-NEXT: }
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# SYMTAB-LLVM-NEXT: Group {
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# SYMTAB-LLVM-NEXT: Name: .group1 (64)
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# SYMTAB-LLVM-NEXT: Index: 2
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# SYMTAB-LLVM-NEXT: Link: 7
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# SYMTAB-LLVM-NEXT: Info: 2
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# SYMTAB-LLVM-NEXT: Type: COMDAT (0x1)
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# SYMTAB-LLVM-NEXT: Signature: <?>
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# SYMTAB-LLVM-NEXT: Section(s) in group [
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# SYMTAB-LLVM-NEXT: .text.bar (5)
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# SYMTAB-LLVM-NEXT: .rela.text.bar (6)
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# SYMTAB-LLVM-NEXT: ]
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# SYMTAB-LLVM-NEXT: }
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# SYMTAB-LLVM-NEXT: }
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# SYMTAB-GNU: warning: '[[FILE]]': unable to get the string table for SHT_SYMTAB section with index 7: invalid section index: 255
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# SYMTAB-GNU-EMPTY:
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# SYMTAB-GNU-NEXT: COMDAT group section [ 1] `.group' [<?>] contains 2 sections:
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# SYMTAB-GNU-NEXT: [Index] Name
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# SYMTAB-GNU-NEXT: [ 3] .text.foo
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# SYMTAB-GNU-NEXT: [ 4] .rela.text.foo
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# SYMTAB-GNU-EMPTY:
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# SYMTAB-GNU-NEXT: COMDAT group section [ 2] `.group1' [<?>] contains 2 sections:
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# SYMTAB-GNU-NEXT: [Index] Name
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# SYMTAB-GNU-NEXT: [ 5] .text.bar
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# SYMTAB-GNU-NEXT: [ 6] .rela.text.bar
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@ -170,6 +170,22 @@ struct DynRegionInfo {
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}
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};
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struct GroupMember {
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StringRef Name;
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uint64_t Index;
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};
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struct GroupSection {
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StringRef Name;
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std::string Signature;
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uint64_t ShName;
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uint64_t Index;
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uint32_t Link;
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uint32_t Info;
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uint32_t Type;
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std::vector<GroupMember> Members;
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};
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namespace {
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struct VerdAux {
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unsigned Offset;
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@ -773,6 +789,8 @@ public:
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const ELFDumper<ELFT> &dumper() const { return Dumper; }
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protected:
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std::vector<GroupSection> getGroups();
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void printDependentLibsHelper(
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function_ref<void(const Elf_Shdr &)> OnSectionStart,
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function_ref<void(StringRef, uint64_t)> OnSectionEntry);
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@ -3551,29 +3569,21 @@ template <class ELFT> void GNUStyle<ELFT>::printFileHeaders() {
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printFields(OS, "Section header string table index:", Str);
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}
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namespace {
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struct GroupMember {
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StringRef Name;
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uint64_t Index;
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};
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template <class ELFT> std::vector<GroupSection> DumpStyle<ELFT>::getGroups() {
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auto GetSignature = [&](const Elf_Sym &Sym,
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const Elf_Shdr &Symtab) -> StringRef {
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Expected<StringRef> StrTableOrErr = Obj.getStringTableForSymtab(Symtab);
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if (!StrTableOrErr) {
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reportUniqueWarning(createError("unable to get the string table for " +
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describe(Obj, Symtab) + ": " +
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toString(StrTableOrErr.takeError())));
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return "<?>";
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}
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struct GroupSection {
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StringRef Name;
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std::string Signature;
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uint64_t ShName;
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uint64_t Index;
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uint32_t Link;
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uint32_t Info;
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uint32_t Type;
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std::vector<GroupMember> Members;
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};
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template <class ELFT>
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std::vector<GroupSection> getGroups(const ELFFile<ELFT> &Obj,
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StringRef FileName) {
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using Elf_Shdr = typename ELFT::Shdr;
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using Elf_Sym = typename ELFT::Sym;
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using Elf_Word = typename ELFT::Word;
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// TODO: this might lead to a crash or produce a wrong result, when the
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// st_name goes past the end of the string table.
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return StrTableOrErr->data() + Sym.st_name;
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};
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std::vector<GroupSection> Ret;
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uint64_t I = 0;
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@ -3584,15 +3594,14 @@ std::vector<GroupSection> getGroups(const ELFFile<ELFT> &Obj,
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const Elf_Shdr *Symtab =
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unwrapOrError(FileName, Obj.getSection(Sec.sh_link));
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StringRef StrTable =
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unwrapOrError(FileName, Obj.getStringTableForSymtab(*Symtab));
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const Elf_Sym *Sym = unwrapOrError(
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FileName, Obj.template getEntry<Elf_Sym>(*Symtab, Sec.sh_info));
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auto Data = unwrapOrError(
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FileName, Obj.template getSectionContentsAsArray<Elf_Word>(Sec));
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StringRef Name = unwrapOrError(FileName, Obj.getSectionName(Sec));
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StringRef Signature = StrTable.data() + Sym->st_name;
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StringRef Signature = GetSignature(*Sym, *Symtab);
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Ret.push_back({Name,
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maybeDemangle(Signature),
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Sec.sh_name,
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@ -3612,7 +3621,7 @@ std::vector<GroupSection> getGroups(const ELFFile<ELFT> &Obj,
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return Ret;
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}
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DenseMap<uint64_t, const GroupSection *>
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static DenseMap<uint64_t, const GroupSection *>
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mapSectionsToGroups(ArrayRef<GroupSection> Groups) {
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DenseMap<uint64_t, const GroupSection *> Ret;
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for (const GroupSection &G : Groups)
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@ -3621,10 +3630,8 @@ mapSectionsToGroups(ArrayRef<GroupSection> Groups) {
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return Ret;
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}
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} // namespace
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template <class ELFT> void GNUStyle<ELFT>::printGroupSections() {
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std::vector<GroupSection> V = getGroups<ELFT>(this->Obj, this->FileName);
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std::vector<GroupSection> V = this->getGroups();
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DenseMap<uint64_t, const GroupSection *> Map = mapSectionsToGroups(V);
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for (const GroupSection &G : V) {
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OS << "\n"
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@ -6256,7 +6263,7 @@ template <class ELFT> void LLVMStyle<ELFT>::printFileHeaders() {
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template <class ELFT> void LLVMStyle<ELFT>::printGroupSections() {
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DictScope Lists(W, "Groups");
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std::vector<GroupSection> V = getGroups<ELFT>(this->Obj, this->FileName);
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std::vector<GroupSection> V = this->getGroups();
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DenseMap<uint64_t, const GroupSection *> Map = mapSectionsToGroups(V);
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for (const GroupSection &G : V) {
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DictScope D(W, "Group");
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