Wire up primitive support in the assembler backend for writing .o files
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
diff --git a/lib/Target/PowerPC/PPCAsmBackend.cpp b/lib/Target/PowerPC/PPCAsmBackend.cpp
new file mode 100644
index 0000000..a6d1426
--- /dev/null
+++ b/lib/Target/PowerPC/PPCAsmBackend.cpp
@@ -0,0 +1,104 @@
+//===-- 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 {
+ public:
+ PPCAsmBackend(const Target &T) : TargetAsmBackend(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");
+ }
+
+ bool isVirtualSection(const MCSection &Section) const {
+ const MCSectionMachO &SMO = static_cast<const MCSectionMachO&>(Section);
+ return (SMO.getType() == MCSectionMachO::S_ZEROFILL ||
+ SMO.getType() == MCSectionMachO::S_GB_ZEROFILL ||
+ SMO.getType() == MCSectionMachO::S_THREAD_LOCAL_ZEROFILL);
+ }
+
+ 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;
+ }
+}