llvm-project/lld/ELF/Symbols.cpp

45 lines
1.1 KiB
C++

//===- Symbols.cpp --------------------------------------------------------===//
//
// The LLVM Linker
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "Symbols.h"
#include "Chunks.h"
#include "Error.h"
#include "InputFiles.h"
using namespace llvm::object;
using namespace lld;
using namespace lld::elf2;
// Returns 1, 0 or -1 if this symbol should take precedence
// over the Other, tie or lose, respectively.
int SymbolBody::compare(SymbolBody *Other) {
Kind LK = kind();
Kind RK = Other->kind();
// Normalize so that the smaller kind is on the left.
if (LK > RK)
return -Other->compare(this);
// First handle comparisons between two different kinds.
if (LK != RK)
return 1;
// Now handle the case where the kinds are the same.
switch (LK) {
case DefinedRegularKind:
return 0;
case DefinedWeakKind:
case UndefinedKind:
case UndefinedWeakKind:
return 1;
}
llvm_unreachable("unknown symbol kind");
}