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[LTO] Infer ELFKind/EMachine from Bitcode files

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So that users are not forced to pass `-m` on the command line
when the inputs are all bitcode.

PR:   28268
Differential Revision:  http://reviews.llvm.org/D21779

llvm-svn: 274107
This commit is contained in:
Davide Italiano
2016-06-29 06:12:39 +00:00
parent 34e4e477c8
commit 60976ba86d
2 changed files with 41 additions and 2 deletions
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41
lld/ELF/InputFiles.cpp
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@@ -14,6 +14,7 @@
#include "SymbolTable.h"
#include "Symbols.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/Bitcode/ReaderWriter.h"
#include "llvm/CodeGen/Analysis.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
@@ -552,7 +553,45 @@ template <class ELFT> void SharedFile<ELFT>::parseRest() {
}
}
BitcodeFile::BitcodeFile(MemoryBufferRef M) : InputFile(BitcodeKind, M) {}
static ELFKind getELFKind(MemoryBufferRef MB) {
std::string TripleStr = getBitcodeTargetTriple(MB, Driver->Context);
Triple TheTriple(TripleStr);
bool Is64Bits = TheTriple.isArch64Bit();
if (TheTriple.isLittleEndian())
return Is64Bits ? ELF64LEKind : ELF32LEKind;
return Is64Bits ? ELF64BEKind : ELF32BEKind;
}
static uint8_t getMachineKind(MemoryBufferRef MB) {
std::string TripleStr = getBitcodeTargetTriple(MB, Driver->Context);
switch (Triple(TripleStr).getArch()) {
case Triple::aarch64:
return EM_AARCH64;
case Triple::arm:
return EM_ARM;
case Triple::mips:
case Triple::mipsel:
case Triple::mips64:
case Triple::mips64el:
return EM_MIPS;
case Triple::ppc:
return EM_PPC;
case Triple::ppc64:
return EM_PPC64;
case Triple::x86:
return EM_386;
case Triple::x86_64:
return EM_X86_64;
default:
fatal("unsupported architecture: " + TripleStr);
}
}
BitcodeFile::BitcodeFile(MemoryBufferRef MB) :
InputFile(BitcodeKind, MB) {
EKind = getELFKind(MB);
EMachine = getMachineKind(MB);
}
static uint8_t getGvVisibility(const GlobalValue *GV) {
switch (GV->getVisibility()) {