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Revert "[llvm-objcopy] Add --strip-unneeded option"
There is a use after free I didn't see. Need to investigate. This reverts commit f7624abeb1f0d012309baf2e78cf2499fbfe5e5f. llvm-svn: 332925
This commit is contained in:
Paul Semel
parent
ff6d56ed90
commit
c9adb6fa8c
@ -1,136 +0,0 @@
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# RUN: yaml2obj %s > %t
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# RUN: llvm-objcopy --strip-unneeded %t %t2
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# RUN: llvm-readobj -symbols %t2 | FileCheck %s
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!ELF
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FileHeader:
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Class: ELFCLASS64
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Data: ELFDATA2LSB
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Type: ET_REL
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Machine: EM_X86_64
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Sections:
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- Name: .text
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Type: SHT_PROGBITS
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Flags: [ SHF_ALLOC, SHF_EXECINSTR ]
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Address: 0x1000
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AddressAlign: 0x0000000000000010
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Size: 64
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- Name: .group
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Type: SHT_GROUP
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Link: .symtab
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AddressAlign: 0x0000000000000004
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Info: barfoo
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Members:
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- SectionOrType: GRP_COMDAT
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- SectionOrType: .text
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- Name: .rel.text
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Type: SHT_REL
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Link: .symtab
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Info: .text
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Relocations:
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- Offset: 0x1000
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Symbol: foo
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Type: R_X86_64_PC32
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Symbols:
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Local:
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- Name: foo
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Type: STT_FUNC
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Section: .text
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Value: 0x1000
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Size: 8
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- Name: bar
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Type: STT_FUNC
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Size: 8
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Section: .text
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Value: 0x1008
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- Name: barfoo
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Type: STT_FUNC
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Size: 8
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Section: .text
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Value: 0x1010
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- Name: fileSymbol
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Type: STT_FILE
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- Name: sectionSymbol
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Type: STT_SECTION
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Weak:
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- Name: baz
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Type: STT_FUNC
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Size: 8
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Section: .text
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Value: 0x1018
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- Name: foobaz
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Type: STT_FUNC
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Global:
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- Name: foobar
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Type: STT_FUNC
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- Name: barbaz
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Type: STT_FUNC
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Size: 8
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Section: .text
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Value: 0x1020
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#CHECK: Symbols [
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#CHECK-NEXT: Symbol {
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#CHECK-NEXT: Name:
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#CHECK-NEXT: Value: 0x0
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#CHECK-NEXT: Size: 0
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#CHECK-NEXT: Binding: Local
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#CHECK-NEXT: Type: None
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#CHECK-NEXT: Other: 0
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#CHECK-NEXT: Section: Undefined
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#CHECK-NEXT: }
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#CHECK-NEXT: Symbol {
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#CHECK-NEXT: Name: foo
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#CHECK-NEXT: Value: 0x1000
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#CHECK-NEXT: Size: 8
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#CHECK-NEXT: Binding: Local
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#CHECK-NEXT: Type: Function
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#CHECK-NEXT: Other: 0
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#CHECK-NEXT: Section: .text
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#CHECK-NEXT: }
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#CHECK-NEXT: Symbol {
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#CHECK-NEXT: Name: barfoo
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#CHECK-NEXT: Value: 0x1010
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#CHECK-NEXT: Size: 8
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#CHECK-NEXT: Binding: Local
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#CHECK-NEXT: Type: Function
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#CHECK-NEXT: Other: 0
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#CHECK-NEXT: Section: .text
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#CHECK-NEXT: }
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#CHECK-NEXT: Symbol {
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#CHECK-NEXT: Name: fileSymbol
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#CHECK-NEXT: Value: 0x0
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#CHECK-NEXT: Size: 0
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#CHECK-NEXT: Binding: Local
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#CHECK-NEXT: Type: File
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#CHECK-NEXT: Other: 0
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#CHECK-NEXT: Section: Undefined
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#CHECK-NEXT: }
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#CHECK-NEXT: Symbol {
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#CHECK-NEXT: Name: sectionSymbol
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#CHECK-NEXT: Value: 0x0
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#CHECK-NEXT: Size: 0
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#CHECK-NEXT: Binding: Local
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#CHECK-NEXT: Type: Section
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#CHECK-NEXT: Other: 0
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#CHECK-NEXT: Section: Undefined
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#CHECK-NEXT: }
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#CHECK-NEXT: Symbol {
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#CHECK-NEXT: Name: barbaz
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#CHECK-NEXT: Value: 0x1020
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#CHECK-NEXT: Size: 8
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#CHECK-NEXT: Binding: Global
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#CHECK-NEXT: Type: Function
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#CHECK-NEXT: Other: 0
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#CHECK-NEXT: Section: .text
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#CHECK-NEXT: }
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#CHECK-NEXT: Symbol {
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#CHECK-NEXT: Name: baz
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#CHECK-NEXT: Value: 0x1018
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#CHECK-NEXT: Size: 8
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#CHECK-NEXT: Binding: Weak
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#CHECK-NEXT: Type: Function
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#CHECK-NEXT: Other: 0
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#CHECK-NEXT: Section: .text
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#CHECK-NEXT: }
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#CHECK-NEXT:]
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@ -90,5 +90,3 @@ def K : JoinedOrSeparate<["-"], "K">,
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Alias<keep_symbol>;
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def only_keep_debug : Flag<["-", "--"], "only-keep-debug">,
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HelpText<"Currently ignored. Only for compaitability with GNU objcopy.">;
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def strip_unneeded : Flag<["-", "--"], "strip-unneeded">,
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HelpText<"Remove all symbols not needed by relocations">;
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@ -185,7 +185,6 @@ void SymbolTableSection::addSymbol(StringRef Name, uint8_t Bind, uint8_t Type,
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Sym.Visibility = Visibility;
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Sym.Size = Sz;
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Sym.Index = Symbols.size();
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Sym.ReferenceCount = 0;
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Symbols.emplace_back(llvm::make_unique<Symbol>(Sym));
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Size += this->EntrySize;
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}
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@ -256,11 +255,6 @@ const Symbol *SymbolTableSection::getSymbolByIndex(uint32_t Index) const {
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return Symbols[Index].get();
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}
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Symbol *SymbolTableSection::getSymbolByIndex(uint32_t Index) {
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return const_cast<Symbol *>(
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static_cast<const SymbolTableSection *>(this)->getSymbolByIndex(Index));
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}
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template <class ELFT>
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void ELFSectionWriter<ELFT>::visit(const SymbolTableSection &Sec) {
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uint8_t *Buf = Out.getBufferStart();
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@ -350,12 +344,6 @@ void RelocationSection::accept(SectionVisitor &Visitor) const {
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Visitor.visit(*this);
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}
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RelocationSection::~RelocationSection() {
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for (auto &Rel : Relocations) {
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--Rel.RelocSymbol->ReferenceCount;
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}
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}
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void RelocationSection::removeSymbols(
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function_ref<bool(const Symbol &)> ToRemove) {
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for (const Relocation &Reloc : Relocations)
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@ -659,9 +647,7 @@ void initRelocations(RelocationSection *Relocs, SymbolTableSection *SymbolTable,
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ToAdd.Offset = Rel.r_offset;
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getAddend(ToAdd.Addend, Rel);
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ToAdd.Type = Rel.getType(false);
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Symbol *Sym = SymbolTable->getSymbolByIndex(Rel.getSymbol(false));
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++Sym->ReferenceCount;
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ToAdd.RelocSymbol = Sym;
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ToAdd.RelocSymbol = SymbolTable->getSymbolByIndex(Rel.getSymbol(false));
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Relocs->addRelocation(ToAdd);
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}
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}
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@ -344,7 +344,6 @@ struct Symbol {
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uint8_t Type;
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uint64_t Value;
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uint8_t Visibility;
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uint32_t ReferenceCount;
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uint16_t getShndx() const;
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};
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@ -368,7 +367,6 @@ public:
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void addSymbolNames();
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const SectionBase *getStrTab() const { return SymbolNames; }
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const Symbol *getSymbolByIndex(uint32_t Index) const;
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Symbol *getSymbolByIndex(uint32_t Index);
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void updateSymbols(function_ref<void(Symbol &)> Callable);
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void removeSectionReferences(const SectionBase *Sec) override;
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@ -383,7 +381,7 @@ public:
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};
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struct Relocation {
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Symbol *RelocSymbol = nullptr;
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const Symbol *RelocSymbol = nullptr;
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uint64_t Offset;
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uint64_t Addend;
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uint32_t Type;
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@ -434,7 +432,6 @@ class RelocationSection
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std::vector<Relocation> Relocations;
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public:
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~RelocationSection();
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void addRelocation(Relocation Rel) { Relocations.push_back(Rel); }
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void accept(SectionVisitor &Visitor) const override;
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void removeSymbols(function_ref<bool(const Symbol &)> ToRemove) override;
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@ -452,7 +449,7 @@ public:
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class GroupSection : public SectionBase {
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MAKE_SEC_WRITER_FRIEND
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const SymbolTableSection *SymTab = nullptr;
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Symbol *Sym = nullptr;
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const Symbol *Sym = nullptr;
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ELF::Elf32_Word FlagWord;
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SmallVector<SectionBase *, 3> GroupMembers;
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@ -462,16 +459,9 @@ public:
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ArrayRef<uint8_t> Contents;
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explicit GroupSection(ArrayRef<uint8_t> Data) : Contents(Data) {}
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~GroupSection() {
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if (Sym)
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--Sym->ReferenceCount;
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}
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void setSymTab(const SymbolTableSection *SymTabSec) { SymTab = SymTabSec; }
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void setSymbol(Symbol *S) {
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Sym = S;
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++Sym->ReferenceCount;
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}
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void setSymbol(const Symbol *S) { Sym = S; }
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void setFlagWord(ELF::Elf32_Word W) { FlagWord = W; }
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void addMember(SectionBase *Sec) { GroupMembers.push_back(Sec); }
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@ -156,7 +156,6 @@ struct CopyConfig {
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bool StripSections = false;
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bool StripNonAlloc = false;
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bool StripDWO = false;
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bool StripUnneeded = false;
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bool ExtractDWO = false;
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bool LocalizeHidden = false;
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bool Weaken = false;
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@ -390,13 +389,6 @@ void HandleArgs(const CopyConfig &Config, Object &Obj, const Reader &Reader,
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return true;
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}
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// TODO: We might handle the 'null symbol' in a different way
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// by probably handling it the same way as we handle 'null section' ?
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if (Config.StripUnneeded && !Sym.ReferenceCount && Sym.Index != 0 &&
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(Sym.Binding == STB_LOCAL || Sym.getShndx() == SHN_UNDEF) &&
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Sym.Type != STT_FILE && Sym.Type != STT_SECTION)
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return true;
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return false;
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});
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}
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@ -487,7 +479,6 @@ CopyConfig ParseObjcopyOptions(ArrayRef<const char *> ArgsArr) {
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Config.StripDWO = InputArgs.hasArg(OBJCOPY_strip_dwo);
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Config.StripSections = InputArgs.hasArg(OBJCOPY_strip_sections);
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Config.StripNonAlloc = InputArgs.hasArg(OBJCOPY_strip_non_alloc);
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Config.StripUnneeded = InputArgs.hasArg(OBJCOPY_strip_unneeded);
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Config.ExtractDWO = InputArgs.hasArg(OBJCOPY_extract_dwo);
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Config.LocalizeHidden = InputArgs.hasArg(OBJCOPY_localize_hidden);
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Config.Weaken = InputArgs.hasArg(OBJCOPY_weaken);
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