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//===-- PPCAsmBackend.cpp - PPC Assembler Backend -------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/Target/TargetAsmBackend.h"
#include "PPC.h"
#include "PPCFixupKinds.h"
#include "llvm/MC/MCSectionMachO.h"
#include "llvm/MC/MCObjectFormat.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/Target/TargetRegistry.h"
#include "llvm/Support/MachO.h"
using namespace llvm;
namespace {
class PPCAsmBackend : public TargetAsmBackend {
const Target &TheTarget;
public:
PPCAsmBackend(const Target &T) : TargetAsmBackend(), TheTarget(T) {}
bool MayNeedRelaxation(const MCInst &Inst) const {
// FIXME.
return false;
}
void RelaxInstruction(const MCInst &Inst, MCInst &Res) const {
// FIXME.
assert(0 && "RelaxInstruction() unimplemented");
}
bool WriteNopData(uint64_t Count, MCObjectWriter *OW) const {
// FIXME: Zero fill for now. That's not right, but at least will get the
// section size right.
for (uint64_t i = 0; i != Count; ++i)
OW->Write8(0);
return true;
}
unsigned getPointerSize() const {
StringRef Name = TheTarget.getName();
if (Name == "ppc64") return 8;
assert(Name == "ppc32" && "Unknown target name!");
return 4;
}
};
} // end anonymous namespace
// FIXME: This should be in a separate file.
namespace {
class DarwinPPCAsmBackend : public PPCAsmBackend {
MCMachOObjectFormat Format;
public:
DarwinPPCAsmBackend(const Target &T) : PPCAsmBackend(T) {
HasScatteredSymbols = true;
}
virtual const MCObjectFormat &getObjectFormat() const {
return Format;
}
void ApplyFixup(const MCFixup &Fixup, MCDataFragment &DF,
uint64_t Value) const {
assert(0 && "UNIMP");
}
MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
bool is64 = getPointerSize() == 8;
return createMachObjectWriter(OS, /*Is64Bit=*/is64,
is64 ? MachO::CPUTypePowerPC64 :
MachO::CPUTypePowerPC64,
MachO::CPUSubType_POWERPC_ALL,
/*IsLittleEndian=*/false);
}
virtual bool doesSectionRequireSymbols(const MCSection &Section) const {
return false;
}
};
} // end anonymous namespace
TargetAsmBackend *llvm::createPPCAsmBackend(const Target &T,
const std::string &TT) {
switch (Triple(TT).getOS()) {
case Triple::Darwin:
return new DarwinPPCAsmBackend(T);
default:
return 0;
}
}
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