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//===--------- lib/ReaderWriter/ELF/ARM/ARMSymbolTable.h ------------------===//
//
// The LLVM Linker
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLD_READER_WRITER_ELF_ARM_ARM_SYMBOL_TABLE_H
#define LLD_READER_WRITER_ELF_ARM_ARM_SYMBOL_TABLE_H
#include "SectionChunks.h"
#include "TargetLayout.h"
#include "ARMELFFile.h"
namespace lld {
namespace elf {
/// \brief The SymbolTable class represents the symbol table in a ELF file
class ARMSymbolTable : public SymbolTable<ELF32LE> {
public:
typedef llvm::object::Elf_Sym_Impl<ELF32LE> Elf_Sym;
ARMSymbolTable(const ELFLinkingContext &ctx);
void addDefinedAtom(Elf_Sym &sym, const DefinedAtom *da,
int64_t addr) override;
};
ARMSymbolTable::ARMSymbolTable(const ELFLinkingContext &ctx)
: SymbolTable(ctx, ".symtab", TargetLayout<ELF32LE>::ORDER_SYMBOL_TABLE) {}
void ARMSymbolTable::addDefinedAtom(Elf_Sym &sym, const DefinedAtom *da,
int64_t addr) {
SymbolTable::addDefinedAtom(sym, da, addr);
if ((ARMELFDefinedAtom::ARMContentType)da->contentType() ==
ARMELFDefinedAtom::typeARMExidx)
sym.st_value = addr;
// Set zero bit to distinguish real symbols addressing Thumb instructions.
// Don't care about mapping symbols like $t and others.
if (DefinedAtom::codeARMThumb == da->codeModel())
sym.st_value = static_cast<int64_t>(sym.st_value) | 0x1;
// Mapping symbols should have special values of binding, type and size set.
if ((DefinedAtom::codeARM_a == da->codeModel()) ||
(DefinedAtom::codeARM_d == da->codeModel()) ||
(DefinedAtom::codeARM_t == da->codeModel())) {
sym.setBindingAndType(llvm::ELF::STB_LOCAL, llvm::ELF::STT_NOTYPE);
sym.st_size = 0;
}
}
} // elf
} // lld
#endif // LLD_READER_WRITER_ELF_ARM_ARM_SYMBOL_TABLE_H
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