diff options
| -rw-r--r-- | lld/ELF/Writer.cpp | 191 |
1 files changed, 95 insertions, 96 deletions
diff --git a/lld/ELF/Writer.cpp b/lld/ELF/Writer.cpp index c62d49a7c98..4ba25241e19 100644 --- a/lld/ELF/Writer.cpp +++ b/lld/ELF/Writer.cpp @@ -46,7 +46,6 @@ public: void run(); private: - void createSyntheticSections(); void copyLocalSymbols(); void addSectionSymbols(); void forEachRelSec(std::function<void(InputSectionBase &)> Fn); @@ -233,99 +232,6 @@ template <class ELFT> static void addReservedSymbols() { ElfSym::Edata2 = Add("_edata", -1); } -// The main function of the writer. -template <class ELFT> void Writer<ELFT>::run() { - // Create linker-synthesized sections such as .got or .plt. - // Such sections are of type input section. - createSyntheticSections(); - - if (!Config->Relocatable) - combineEhFrameSections<ELFT>(); - - // We need to create some reserved symbols such as _end. Create them. - if (!Config->Relocatable) - addReservedSymbols<ELFT>(); - - // We want to process linker script commands. When SECTIONS command - // is given we let it create sections. - Script->processSectionCommands(); - - // Linker scripts controls how input sections are assigned to output sections. - // Input sections that were not handled by scripts are called "orphans", and - // they are assigned to output sections by the default rule. Process that. - Script->addOrphanSections(); - - if (Config->Discard != DiscardPolicy::All) - copyLocalSymbols(); - - if (Config->CopyRelocs) - addSectionSymbols(); - - // Now that we have a complete set of output sections. This function - // completes section contents. For example, we need to add strings - // to the string table, and add entries to .got and .plt. - // finalizeSections does that. - finalizeSections(); - if (errorCount()) - return; - - // If -compressed-debug-sections is specified, we need to compress - // .debug_* sections. Do it right now because it changes the size of - // output sections. - parallelForEach(OutputSections, - [](OutputSection *Sec) { Sec->maybeCompress<ELFT>(); }); - - Script->assignAddresses(); - Script->allocateHeaders(Phdrs); - - // Remove empty PT_LOAD to avoid causing the dynamic linker to try to mmap a - // 0 sized region. This has to be done late since only after assignAddresses - // we know the size of the sections. - removeEmptyPTLoad(); - - if (!Config->OFormatBinary) - assignFileOffsets(); - else - assignFileOffsetsBinary(); - - setPhdrs(); - - if (Config->Relocatable) { - for (OutputSection *Sec : OutputSections) - Sec->Addr = 0; - } - - // It does not make sense try to open the file if we have error already. - if (errorCount()) - return; - // Write the result down to a file. - openFile(); - if (errorCount()) - return; - - if (!Config->OFormatBinary) { - writeTrapInstr(); - writeHeader(); - writeSections(); - } else { - writeSectionsBinary(); - } - - // Backfill .note.gnu.build-id section content. This is done at last - // because the content is usually a hash value of the entire output file. - writeBuildId(); - if (errorCount()) - return; - - // Handle -Map option. - writeMapFile(); - if (errorCount()) - return; - - if (auto E = Buffer->commit()) - error("failed to write to the output file: " + toString(std::move(E))); -} - static OutputSection *findSection(StringRef Name) { for (BaseCommand *Base : Script->SectionCommands) if (auto *Sec = dyn_cast<OutputSection>(Base)) @@ -335,7 +241,7 @@ static OutputSection *findSection(StringRef Name) { } // Initialize Out members. -template <class ELFT> void Writer<ELFT>::createSyntheticSections() { +template <class ELFT> static void createSyntheticSections() { // Initialize all pointers with NULL. This is needed because // you can call lld::elf::main more than once as a library. memset(&Out::First, 0, sizeof(Out)); @@ -354,7 +260,7 @@ template <class ELFT> void Writer<ELFT>::createSyntheticSections() { InX::ShStrTab = make<StringTableSection>(".shstrtab", false); Out::ElfHeader = make<OutputSection>("", 0, SHF_ALLOC); - Out::ElfHeader->Size = sizeof(Elf_Ehdr); + Out::ElfHeader->Size = sizeof(typename ELFT::Ehdr); Out::ProgramHeaders = make<OutputSection>("", 0, SHF_ALLOC); Out::ProgramHeaders->Alignment = Config->Wordsize; @@ -491,6 +397,99 @@ template <class ELFT> void Writer<ELFT>::createSyntheticSections() { Add(InX::StrTab); } +// The main function of the writer. +template <class ELFT> void Writer<ELFT>::run() { + // Create linker-synthesized sections such as .got or .plt. + // Such sections are of type input section. + createSyntheticSections<ELFT>(); + + if (!Config->Relocatable) + combineEhFrameSections<ELFT>(); + + // We need to create some reserved symbols such as _end. Create them. + if (!Config->Relocatable) + addReservedSymbols<ELFT>(); + + // We want to process linker script commands. When SECTIONS command + // is given we let it create sections. + Script->processSectionCommands(); + + // Linker scripts controls how input sections are assigned to output sections. + // Input sections that were not handled by scripts are called "orphans", and + // they are assigned to output sections by the default rule. Process that. + Script->addOrphanSections(); + + if (Config->Discard != DiscardPolicy::All) + copyLocalSymbols(); + + if (Config->CopyRelocs) + addSectionSymbols(); + + // Now that we have a complete set of output sections. This function + // completes section contents. For example, we need to add strings + // to the string table, and add entries to .got and .plt. + // finalizeSections does that. + finalizeSections(); + if (errorCount()) + return; + + // If -compressed-debug-sections is specified, we need to compress + // .debug_* sections. Do it right now because it changes the size of + // output sections. + parallelForEach(OutputSections, + [](OutputSection *Sec) { Sec->maybeCompress<ELFT>(); }); + + Script->assignAddresses(); + Script->allocateHeaders(Phdrs); + + // Remove empty PT_LOAD to avoid causing the dynamic linker to try to mmap a + // 0 sized region. This has to be done late since only after assignAddresses + // we know the size of the sections. + removeEmptyPTLoad(); + + if (!Config->OFormatBinary) + assignFileOffsets(); + else + assignFileOffsetsBinary(); + + setPhdrs(); + + if (Config->Relocatable) { + for (OutputSection *Sec : OutputSections) + Sec->Addr = 0; + } + + // It does not make sense try to open the file if we have error already. + if (errorCount()) + return; + // Write the result down to a file. + openFile(); + if (errorCount()) + return; + + if (!Config->OFormatBinary) { + writeTrapInstr(); + writeHeader(); + writeSections(); + } else { + writeSectionsBinary(); + } + + // Backfill .note.gnu.build-id section content. This is done at last + // because the content is usually a hash value of the entire output file. + writeBuildId(); + if (errorCount()) + return; + + // Handle -Map option. + writeMapFile(); + if (errorCount()) + return; + + if (auto E = Buffer->commit()) + error("failed to write to the output file: " + toString(std::move(E))); +} + static bool shouldKeepInSymtab(SectionBase *Sec, StringRef SymName, const Symbol &B) { if (B.isFile() || B.isSection()) |
