forked from OSchip/llvm-project
ELF: Create a string table.
For now only the sections are in it, but it already makes the output easier to read and test. llvm-svn: 244702
This commit is contained in:
Rafael Espindola
parent
4f89fdad9f
commit
6b83b90b6a
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@ -15,6 +15,7 @@ add_llvm_library(lldELF2
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LINK_COMPONENTS
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Object
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Option
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MC
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Support
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)
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@ -12,7 +12,9 @@
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#include "Error.h"
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#include "SymbolTable.h"
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#include "Writer.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/MC/StringTableBuilder.h"
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#include "llvm/Support/FileOutputBuffer.h"
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using namespace llvm;
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@ -41,6 +43,8 @@ public:
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void addSectionChunk(SectionChunk<ELFT> *C);
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std::vector<Chunk *> &getChunks() { return Chunks; }
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void writeHeaderTo(Elf_Shdr *SHdr);
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StringRef getName() { return Name; }
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void setNameOffset(uintX_t Offset) { Header.sh_name = Offset; }
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// Returns the size of the section in the output file.
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uintX_t getSize() { return Header.sh_size; }
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@ -73,6 +77,10 @@ private:
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uintX_t FileSize;
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uintX_t SizeOfHeaders;
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uintX_t SectionHeaderOff;
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uintX_t StringTableOff;
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unsigned StringTableIndex;
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StringTableBuilder StrTabBuilder;
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unsigned NumSections;
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std::vector<std::unique_ptr<Chunk>> Chunks;
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};
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@ -160,10 +168,26 @@ template <class ELFT> void Writer<ELFT>::assignAddresses() {
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Sec->setFileOffset(FileOff);
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VA += RoundUpToAlignment(Sec->getSize(), PageSize);
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FileOff += RoundUpToAlignment(Sec->getSize(), 8);
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StrTabBuilder.add(Sec->getName());
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}
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// Regular sections.
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NumSections = OutputSections.size();
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// First dummy section.
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NumSections++;
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// String table.
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StrTabBuilder.add(".strtab");
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StringTableIndex = NumSections;
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StringTableOff = FileOff;
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StrTabBuilder.finalize(StringTableBuilder::ELF);
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FileOff += StrTabBuilder.data().size();
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NumSections++;
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// Add space for section headers.
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SectionHeaderOff = FileOff;
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FileOff += (OutputSections.size() + 1) * sizeof(Elf_Shdr_Impl<ELFT>);
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FileOff += NumSections * sizeof(Elf_Shdr_Impl<ELFT>);
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FileSize = SizeOfHeaders + RoundUpToAlignment(FileOff - SizeOfHeaders, 8);
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}
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@ -192,8 +216,8 @@ template <class ELFT> void Writer<ELFT>::writeHeader() {
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EHdr->e_phentsize = sizeof(Elf_Phdr_Impl<ELFT>);
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EHdr->e_phnum = 1;
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EHdr->e_shentsize = sizeof(Elf_Shdr_Impl<ELFT>);
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EHdr->e_shnum = OutputSections.size() + 1;
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EHdr->e_shstrndx = 0;
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EHdr->e_shnum = NumSections;
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EHdr->e_shstrndx = StringTableIndex;
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auto PHdrs = reinterpret_cast<Elf_Phdr_Impl<ELFT> *>(Buf + EHdr->e_phoff);
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PHdrs->p_type = PT_LOAD;
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@ -208,10 +232,24 @@ template <class ELFT> void Writer<ELFT>::writeHeader() {
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auto SHdrs = reinterpret_cast<Elf_Shdr_Impl<ELFT> *>(Buf + EHdr->e_shoff);
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// First entry is null.
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++SHdrs;
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for (OutputSection<ELFT> *Sec : OutputSections)
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for (OutputSection<ELFT> *Sec : OutputSections) {
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Sec->setNameOffset(StrTabBuilder.getOffset(Sec->getName()));
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Sec->writeHeaderTo(SHdrs++);
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}
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// String table.
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SHdrs->sh_name = StrTabBuilder.getOffset(".strtab");
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SHdrs->sh_type = SHT_STRTAB;
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SHdrs->sh_flags = 0;
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SHdrs->sh_addr = 0;
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SHdrs->sh_offset = StringTableOff;
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SHdrs->sh_size = StrTabBuilder.data().size();
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SHdrs->sh_link = 0;
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SHdrs->sh_info = 0;
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SHdrs->sh_addralign = 1;
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SHdrs->sh_entsize = 0;
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}
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template <class ELFT> void Writer<ELFT>::openFile(StringRef Path) {
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std::error_code EC = FileOutputBuffer::create(Path, FileSize, Buffer,
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FileOutputBuffer::F_executable);
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@ -225,4 +263,8 @@ template <class ELFT> void Writer<ELFT>::writeSections() {
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for (Chunk *C : Sec->getChunks())
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C->writeTo(Buf);
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}
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// String table.
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StringRef Data = StrTabBuilder.data();
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memcpy(Buf + StringTableOff, Data.data(), Data.size());
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}
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@ -25,15 +25,15 @@ _start:
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# CHECK-NEXT: Version: 1
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# CHECK-NEXT: Entry: 0x401000
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# CHECK-NEXT: ProgramHeaderOffset: 0x40
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# CHECK-NEXT: SectionHeaderOffset: 0x1010
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# CHECK-NEXT: SectionHeaderOffset: 0x102A
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# CHECK-NEXT: Flags [ (0x0)
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# CHECK-NEXT: ]
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# CHECK-NEXT: HeaderSize: 64
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# CHECK-NEXT: ProgramHeaderEntrySize: 56
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# CHECK-NEXT: ProgramHeaderCount: 1
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# CHECK-NEXT: SectionHeaderEntrySize: 64
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# CHECK-NEXT: SectionHeaderCount: 4
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# CHECK-NEXT: StringTableSectionIndex: 0
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# CHECK-NEXT: SectionHeaderCount: 5
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# CHECK-NEXT: StringTableSectionIndex: 4
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# CHECK-NEXT: }
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# CHECK-NEXT: Sections [
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# CHECK-NEXT: Section {
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@ -52,7 +52,7 @@ _start:
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# CHECK-NEXT: }
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# CHECK-NEXT: Section {
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# CHECK-NEXT: Index: 1
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# CHECK-NEXT: Name: (0)
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# CHECK-NEXT: Name: .text
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# CHECK-NEXT: Type: SHT_PROGBITS (0x1)
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# CHECK-NEXT: Flags [ (0x6)
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# CHECK-NEXT: SHF_ALLOC (0x2)
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@ -68,7 +68,7 @@ _start:
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# CHECK-NEXT: }
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# CHECK-NEXT: Section {
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# CHECK-NEXT: Index: 2
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# CHECK-NEXT: Name: (0)
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# CHECK-NEXT: Name: .data
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# CHECK-NEXT: Type: SHT_PROGBITS (0x1)
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# CHECK-NEXT: Flags [ (0x3)
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# CHECK-NEXT: SHF_ALLOC (0x2)
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@ -84,7 +84,7 @@ _start:
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# CHECK-NEXT: }
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# CHECK-NEXT: Section {
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# CHECK-NEXT: Index: 3
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# CHECK-NEXT: Name: (0)
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# CHECK-NEXT: Name: .bss
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# CHECK-NEXT: Type: SHT_NOBITS (0x8)
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# CHECK-NEXT: Flags [ (0x3)
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# CHECK-NEXT: SHF_ALLOC (0x2)
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@ -98,6 +98,20 @@ _start:
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# CHECK-NEXT: AddressAlignment: 0
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# CHECK-NEXT: EntrySize: 0
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# CHECK-NEXT: }
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# CHECK-NEXT: Section {
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# CHECK-NEXT: Index: 4
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# CHECK-NEXT: Name: .strtab (12)
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# CHECK-NEXT: Type: SHT_STRTAB (0x3)
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# CHECK-NEXT: Flags [ (0x0)
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# CHECK-NEXT: ]
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# CHECK-NEXT: Address: 0x0
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# CHECK-NEXT: Offset: 0x1010
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# CHECK-NEXT: Size: 26
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# CHECK-NEXT: Link: 0
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# CHECK-NEXT: Info: 0
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# CHECK-NEXT: AddressAlignment: 1
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# CHECK-NEXT: EntrySize: 0
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# CHECK-NEXT: }
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# CHECK-NEXT: ]
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# CHECK-NEXT: ProgramHeaders [
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# CHECK-NEXT: ProgramHeader {
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@ -105,8 +119,8 @@ _start:
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# CHECK-NEXT: Offset: 0x0
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# CHECK-NEXT: VirtualAddress: 0x400000
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# CHECK-NEXT: PhysicalAddress: 0x400000
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# CHECK-NEXT: FileSize: 4368
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# CHECK-NEXT: MemSize: 4368
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# CHECK-NEXT: FileSize: 4464
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# CHECK-NEXT: MemSize: 4464
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# CHECK-NEXT: Flags [ (0x5)
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# CHECK-NEXT: PF_R (0x4)
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# CHECK-NEXT: PF_X (0x1)
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@ -25,15 +25,15 @@ _start:
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# CHECK-NEXT: Version: 1
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# CHECK-NEXT: Entry: 0x401000
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# CHECK-NEXT: ProgramHeaderOffset: 0x34
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# CHECK-NEXT: SectionHeaderOffset: 0x1010
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# CHECK-NEXT: SectionHeaderOffset: 0x102A
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# CHECK-NEXT: Flags [ (0x0)
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# CHECK-NEXT: ]
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# CHECK-NEXT: HeaderSize: 52
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# CHECK-NEXT: ProgramHeaderEntrySize: 32
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# CHECK-NEXT: ProgramHeaderCount: 1
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# CHECK-NEXT: SectionHeaderEntrySize: 40
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# CHECK-NEXT: SectionHeaderCount: 4
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# CHECK-NEXT: StringTableSectionIndex: 0
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# CHECK-NEXT: SectionHeaderCount: 5
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# CHECK-NEXT: StringTableSectionIndex: 4
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# CHECK-NEXT: }
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# CHECK-NEXT: Sections [
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# CHECK-NEXT: Section {
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@ -52,7 +52,7 @@ _start:
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# CHECK-NEXT: }
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# CHECK-NEXT: Section {
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# CHECK-NEXT: Index: 1
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# CHECK-NEXT: Name: (0)
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# CHECK-NEXT: Name: .text
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# CHECK-NEXT: Type: SHT_PROGBITS (0x1)
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# CHECK-NEXT: Flags [ (0x6)
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# CHECK-NEXT: SHF_ALLOC (0x2)
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@ -68,7 +68,7 @@ _start:
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# CHECK-NEXT: }
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# CHECK-NEXT: Section {
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# CHECK-NEXT: Index: 2
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# CHECK-NEXT: Name: (0)
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# CHECK-NEXT: Name: .data
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# CHECK-NEXT: Type: SHT_PROGBITS (0x1)
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# CHECK-NEXT: Flags [ (0x3)
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# CHECK-NEXT: SHF_ALLOC (0x2)
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@ -84,7 +84,7 @@ _start:
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# CHECK-NEXT: }
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# CHECK-NEXT: Section {
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# CHECK-NEXT: Index: 3
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# CHECK-NEXT: Name: (0)
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# CHECK-NEXT: Name: .bss
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# CHECK-NEXT: Type: SHT_NOBITS (0x8)
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# CHECK-NEXT: Flags [ (0x3)
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# CHECK-NEXT: SHF_ALLOC (0x2)
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@ -98,6 +98,20 @@ _start:
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# CHECK-NEXT: AddressAlignment: 0
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# CHECK-NEXT: EntrySize: 0
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# CHECK-NEXT: }
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# CHECK-NEXT: Section {
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# CHECK-NEXT: Index: 4
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# CHECK-NEXT: Name: .strtab
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# CHECK-NEXT: Type: SHT_STRTAB (0x3)
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# CHECK-NEXT: Flags [ (0x0)
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# CHECK-NEXT: ]
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# CHECK-NEXT: Address: 0x0
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# CHECK-NEXT: Offset: 0x1010
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# CHECK-NEXT: Size: 26
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# CHECK-NEXT: Link: 0
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# CHECK-NEXT: Info: 0
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# CHECK-NEXT: AddressAlignment: 1
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# CHECK-NEXT: EntrySize: 0
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# CHECK-NEXT: }
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# CHECK-NEXT: ]
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# CHECK-NEXT: ProgramHeaders [
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# CHECK-NEXT: ProgramHeader {
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@ -105,8 +119,8 @@ _start:
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# CHECK-NEXT: Offset: 0x0
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# CHECK-NEXT: VirtualAddress: 0x400000
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# CHECK-NEXT: PhysicalAddress: 0x400000
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# CHECK-NEXT: FileSize: 4272
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# CHECK-NEXT: MemSize: 4272
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# CHECK-NEXT: FileSize: 4344
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# CHECK-NEXT: MemSize: 4344
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# CHECK-NEXT: Flags [ (0x5)
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# CHECK-NEXT: PF_R (0x4)
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# CHECK-NEXT: PF_X (0x1)
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@ -25,15 +25,15 @@ _start:
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# CHECK-NEXT: Version: 1
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# CHECK-NEXT: Entry: 0x401000
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# CHECK-NEXT: ProgramHeaderOffset: 0x34
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# CHECK-NEXT: SectionHeaderOffset: 0x1010
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# CHECK-NEXT: SectionHeaderOffset: 0x102A
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# CHECK-NEXT: Flags [ (0x0)
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# CHECK-NEXT: ]
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# CHECK-NEXT: HeaderSize: 52
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# CHECK-NEXT: ProgramHeaderEntrySize: 32
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# CHECK-NEXT: ProgramHeaderCount: 1
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# CHECK-NEXT: SectionHeaderEntrySize: 40
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# CHECK-NEXT: SectionHeaderCount: 4
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# CHECK-NEXT: StringTableSectionIndex: 0
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# CHECK-NEXT: SectionHeaderCount: 5
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# CHECK-NEXT: StringTableSectionIndex: 4
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# CHECK-NEXT: }
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# CHECK-NEXT: Sections [
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# CHECK-NEXT: Section {
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@ -52,7 +52,7 @@ _start:
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# CHECK-NEXT: }
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# CHECK-NEXT: Section {
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# CHECK-NEXT: Index: 1
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# CHECK-NEXT: Name: (0)
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# CHECK-NEXT: Name: .text
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# CHECK-NEXT: Type: SHT_PROGBITS (0x1)
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# CHECK-NEXT: Flags [ (0x6)
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# CHECK-NEXT: SHF_ALLOC (0x2)
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@ -68,7 +68,7 @@ _start:
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# CHECK-NEXT: }
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# CHECK-NEXT: Section {
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# CHECK-NEXT: Index: 2
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# CHECK-NEXT: Name: (0)
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# CHECK-NEXT: Name: .data
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# CHECK-NEXT: Type: SHT_PROGBITS (0x1)
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# CHECK-NEXT: Flags [ (0x3)
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# CHECK-NEXT: SHF_ALLOC (0x2)
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@ -84,7 +84,7 @@ _start:
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# CHECK-NEXT: }
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# CHECK-NEXT: Section {
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# CHECK-NEXT: Index: 3
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# CHECK-NEXT: Name: (0)
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# CHECK-NEXT: Name: .bss
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# CHECK-NEXT: Type: SHT_NOBITS (0x8)
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# CHECK-NEXT: Flags [ (0x3)
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# CHECK-NEXT: SHF_ALLOC (0x2)
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@ -98,6 +98,20 @@ _start:
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# CHECK-NEXT: AddressAlignment: 0
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# CHECK-NEXT: EntrySize: 0
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# CHECK-NEXT: }
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# CHECK-NEXT: Section {
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# CHECK-NEXT: Index: 4
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# CHECK-NEXT: Name: .strtab
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# CHECK-NEXT: Type: SHT_STRTAB (0x3)
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# CHECK-NEXT: Flags [ (0x0)
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# CHECK-NEXT: ]
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# CHECK-NEXT: Address: 0x0
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# CHECK-NEXT: Offset: 0x1010
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# CHECK-NEXT: Size: 26
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# CHECK-NEXT: Link: 0
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# CHECK-NEXT: Info: 0
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# CHECK-NEXT: AddressAlignment: 1
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# CHECK-NEXT: EntrySize: 0
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# CHECK-NEXT: }
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# CHECK-NEXT: ]
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# CHECK-NEXT: ProgramHeaders [
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# CHECK-NEXT: ProgramHeader {
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@ -105,8 +119,8 @@ _start:
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# CHECK-NEXT: Offset: 0x0
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# CHECK-NEXT: VirtualAddress: 0x400000
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# CHECK-NEXT: PhysicalAddress: 0x400000
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# CHECK-NEXT: FileSize: 4272
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# CHECK-NEXT: MemSize: 4272
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# CHECK-NEXT: FileSize: 4344
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# CHECK-NEXT: MemSize: 4344
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# CHECK-NEXT: Flags [ (0x5)
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# CHECK-NEXT: PF_R (0x4)
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# CHECK-NEXT: PF_X (0x1)
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@ -30,15 +30,15 @@ _start:
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# CHECK-NEXT: Version: 1
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# CHECK-NEXT: Entry: 0x401000
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# CHECK-NEXT: ProgramHeaderOffset: 0x40
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# CHECK-NEXT: SectionHeaderOffset: 0x1028
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# CHECK-NEXT: SectionHeaderOffset: 0x1047
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# CHECK-NEXT: Flags [ (0x0)
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# CHECK-NEXT: ]
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# CHECK-NEXT: HeaderSize: 64
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# CHECK-NEXT: ProgramHeaderEntrySize: 56
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# CHECK-NEXT: ProgramHeaderCount: 1
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# CHECK-NEXT: SectionHeaderEntrySize: 64
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# CHECK-NEXT: SectionHeaderCount: 5
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# CHECK-NEXT: StringTableSectionIndex: 0
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# CHECK-NEXT: SectionHeaderCount: 6
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# CHECK-NEXT: StringTableSectionIndex: 5
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# CHECK-NEXT: }
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# CHECK-NEXT: Sections [
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# CHECK-NEXT: Section {
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@ -57,7 +57,7 @@ _start:
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# CHECK-NEXT: }
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# CHECK-NEXT: Section {
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# CHECK-NEXT: Index: 1
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# CHECK-NEXT: Name: (0)
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# CHECK-NEXT: Name: .text
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# CHECK-NEXT: Type: SHT_PROGBITS (0x1)
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# CHECK-NEXT: Flags [ (0x6)
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# CHECK-NEXT: SHF_ALLOC (0x2)
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@ -73,7 +73,7 @@ _start:
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# CHECK-NEXT: }
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# CHECK-NEXT: Section {
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# CHECK-NEXT: Index: 2
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# CHECK-NEXT: Name: (0)
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# CHECK-NEXT: Name: .data
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# CHECK-NEXT: Type: SHT_PROGBITS (0x1)
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# CHECK-NEXT: Flags [ (0x3)
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# CHECK-NEXT: SHF_ALLOC (0x2)
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@ -89,7 +89,7 @@ _start:
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# CHECK-NEXT: }
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# CHECK-NEXT: Section {
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# CHECK-NEXT: Index: 3
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# CHECK-NEXT: Name: (0)
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# CHECK-NEXT: Name: .bss
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# CHECK-NEXT: Type: SHT_NOBITS (0x8)
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# CHECK-NEXT: Flags [ (0x3)
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# CHECK-NEXT: SHF_ALLOC (0x2)
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@ -105,7 +105,7 @@ _start:
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# CHECK-NEXT: }
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# CHECK-NEXT: Section {
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# CHECK-NEXT: Index: 4
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# CHECK-NEXT: Name: (0)
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# CHECK-NEXT: Name: .opd
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# CHECK-NEXT: Type: SHT_PROGBITS (0x1)
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# CHECK-NEXT: Flags [ (0x3)
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# CHECK-NEXT: SHF_ALLOC (0x2)
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@ -119,6 +119,20 @@ _start:
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# CHECK-NEXT: AddressAlignment: 0
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# CHECK-NEXT: EntrySize: 0
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# CHECK-NEXT: }
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# CHECK-NEXT: Section {
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# CHECK-NEXT: Index: 5
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# CHECK-NEXT: Name: .strtab
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# CHECK-NEXT: Type: SHT_STRTAB (0x3)
|
||||
# CHECK-NEXT: Flags [ (0x0)
|
||||
# CHECK-NEXT: ]
|
||||
# CHECK-NEXT: Address: 0x0
|
||||
# CHECK-NEXT: Offset: 0x1028
|
||||
# CHECK-NEXT: Size: 31
|
||||
# CHECK-NEXT: Link: 0
|
||||
# CHECK-NEXT: Info: 0
|
||||
# CHECK-NEXT: AddressAlignment: 1
|
||||
# CHECK-NEXT: EntrySize: 0
|
||||
# CHECK-NEXT: }
|
||||
# CHECK-NEXT: ]
|
||||
# CHECK-NEXT: ProgramHeaders [
|
||||
# CHECK-NEXT: ProgramHeader {
|
||||
|
|
@ -126,8 +140,8 @@ _start:
|
|||
# CHECK-NEXT: Offset: 0x0
|
||||
# CHECK-NEXT: VirtualAddress: 0x400000
|
||||
# CHECK-NEXT: PhysicalAddress: 0x400000
|
||||
# CHECK-NEXT: FileSize: 4456
|
||||
# CHECK-NEXT: MemSize: 4456
|
||||
# CHECK-NEXT: FileSize: 4552
|
||||
# CHECK-NEXT: MemSize: 4552
|
||||
# CHECK-NEXT: Flags [ (0x5)
|
||||
# CHECK-NEXT: PF_R (0x4)
|
||||
# CHECK-NEXT: PF_X (0x1)
|
||||
|
|
|
|||
|
|
@ -0,0 +1,32 @@
|
|||
// RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %s -o %t
|
||||
// RUN: lld -flavor gnu2 %t -o %t2
|
||||
// RUN: llvm-readobj -sections -section-data %t2 | FileCheck %s
|
||||
// REQUIRES: x86
|
||||
|
||||
.global _start
|
||||
_start:
|
||||
|
||||
.section bar, "a"
|
||||
.section foobar, "a"
|
||||
|
||||
// Test that the sting "bar" is merged into "foobar"
|
||||
|
||||
// CHECK: Section {
|
||||
// CHECK: Index: 6
|
||||
// CHECK-NEXT: Name: .strtab
|
||||
// CHECK-NEXT: Type: SHT_STRTAB (0x3)
|
||||
// CHECK-NEXT: Flags [ (0x0)
|
||||
// CHECK-NEXT: ]
|
||||
// CHECK-NEXT: Address: 0x0
|
||||
// CHECK-NEXT: Offset:
|
||||
// CHECK-NEXT: Size: 33
|
||||
// CHECK-NEXT: Link: 0
|
||||
// CHECK-NEXT: Info: 0
|
||||
// CHECK-NEXT: AddressAlignment: 1
|
||||
// CHECK-NEXT: EntrySize: 0
|
||||
// CHECK-NEXT: SectionData (
|
||||
// CHECK-NEXT: 0000: 002E7465 7874002E 62737300 666F6F62 |..text..bss.foob|
|
||||
// CHECK-NEXT: 0010: 6172002E 73747274 6162002E 64617461 |ar..strtab..data|
|
||||
// CHECK-NEXT: 0020: 00 |.|
|
||||
// CHECK-NEXT: )
|
||||
// CHECK-NEXT: }
|
||||
Loading…
Reference in New Issue