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b46443a686
directly on the mac. This is very early, doesn't support relocations and
has a terrible hack to avoid .machine from being printed, but despite
that it generates an bitwise-identical-to-cctools .o file for stuff like
this:
define i32 @test() nounwind { ret i32 42 }
I don't plan to continue pushing this forward, but if anyone else was
interested in doing it, it should be really straight-forward.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119136 91177308-0d34-0410-b5e6-96231b3b80d8
105 lines
3.1 KiB
C++
105 lines
3.1 KiB
C++
//===-- PPCAsmBackend.cpp - PPC Assembler Backend -------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Target/TargetAsmBackend.h"
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#include "PPC.h"
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#include "PPCFixupKinds.h"
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#include "llvm/MC/MCSectionMachO.h"
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#include "llvm/MC/MCObjectFormat.h"
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#include "llvm/MC/MCObjectWriter.h"
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#include "llvm/Target/TargetRegistry.h"
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#include "llvm/Support/MachO.h"
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using namespace llvm;
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namespace {
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class PPCAsmBackend : public TargetAsmBackend {
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public:
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PPCAsmBackend(const Target &T) : TargetAsmBackend(T) {}
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bool MayNeedRelaxation(const MCInst &Inst) const {
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// FIXME.
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return false;
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}
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void RelaxInstruction(const MCInst &Inst, MCInst &Res) const {
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// FIXME.
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assert(0 && "RelaxInstruction() unimplemented");
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}
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bool WriteNopData(uint64_t Count, MCObjectWriter *OW) const {
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// FIXME: Zero fill for now. That's not right, but at least will get the
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// section size right.
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for (uint64_t i = 0; i != Count; ++i)
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OW->Write8(0);
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return true;
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}
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unsigned getPointerSize() const {
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StringRef Name = TheTarget.getName();
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if (Name == "ppc64") return 8;
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assert(Name == "ppc32" && "Unknown target name!");
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return 4;
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}
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};
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} // end anonymous namespace
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// FIXME: This should be in a separate file.
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namespace {
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class DarwinPPCAsmBackend : public PPCAsmBackend {
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MCMachOObjectFormat Format;
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public:
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DarwinPPCAsmBackend(const Target &T) : PPCAsmBackend(T) {
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HasScatteredSymbols = true;
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}
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virtual const MCObjectFormat &getObjectFormat() const {
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return Format;
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}
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void ApplyFixup(const MCFixup &Fixup, MCDataFragment &DF,
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uint64_t Value) const {
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assert(0 && "UNIMP");
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}
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bool isVirtualSection(const MCSection &Section) const {
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const MCSectionMachO &SMO = static_cast<const MCSectionMachO&>(Section);
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return (SMO.getType() == MCSectionMachO::S_ZEROFILL ||
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SMO.getType() == MCSectionMachO::S_GB_ZEROFILL ||
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SMO.getType() == MCSectionMachO::S_THREAD_LOCAL_ZEROFILL);
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}
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MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
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bool is64 = getPointerSize() == 8;
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return createMachObjectWriter(OS, /*Is64Bit=*/is64,
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is64 ? MachO::CPUTypePowerPC64 :
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MachO::CPUTypePowerPC64,
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MachO::CPUSubType_POWERPC_ALL,
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/*IsLittleEndian=*/false);
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}
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virtual bool doesSectionRequireSymbols(const MCSection &Section) const {
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return false;
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}
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};
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} // end anonymous namespace
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TargetAsmBackend *llvm::createPPCAsmBackend(const Target &T,
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const std::string &TT) {
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switch (Triple(TT).getOS()) {
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case Triple::Darwin:
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return new DarwinPPCAsmBackend(T);
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default:
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return 0;
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}
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}
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