ARMAsmBackend uses a factory method to generate binary file format specific

[oota-llvm.git] / lib / Target / ARM / MCTargetDesc / ARMAsmBackend.h

diff --git a/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.h b/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.h
new file mode 100644 (file)
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+++ b/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.h
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+//===-- ARMAsmBackend.h - ARM Assembler Backend -----------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_TARGET_ARM_ARMASMBACKEND_H
+#define LLVM_LIB_TARGET_ARM_ARMASMBACKEND_H
+
+#include "MCTargetDesc/ARMFixupKinds.h"
+#include "llvm/MC/MCAsmBackend.h"
+#include "llvm/MC/MCSubtargetInfo.h"
+
+using namespace llvm;
+
+namespace {
+
+class ARMAsmBackend : public MCAsmBackend {
+  const MCSubtargetInfo *STI;
+  bool isThumbMode;    // Currently emitting Thumb code.
+  bool IsLittleEndian; // Big or little endian.
+public:
+  ARMAsmBackend(const Target &T, StringRef TT, bool IsLittle)
+      : MCAsmBackend(), STI(ARM_MC::createARMMCSubtargetInfo(TT, "", "")),
+        isThumbMode(TT.startswith("thumb")), IsLittleEndian(IsLittle) {}
+
+  ~ARMAsmBackend() override { delete STI; }
+
+  unsigned getNumFixupKinds() const override {
+    return ARM::NumTargetFixupKinds;
+  }
+
+  bool hasNOP() const { return (STI->getFeatureBits() & ARM::HasV6T2Ops) != 0; }
+
+  const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const override;
+
+  /// processFixupValue - Target hook to process the literal value of a fixup
+  /// if necessary.
+  void processFixupValue(const MCAssembler &Asm, const MCAsmLayout &Layout,
+                         const MCFixup &Fixup, const MCFragment *DF,
+                         const MCValue &Target, uint64_t &Value,
+                         bool &IsResolved) override;
+
+  void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
+                  uint64_t Value, bool IsPCRel) const override;
+
+  bool mayNeedRelaxation(const MCInst &Inst) const override;
+
+  bool fixupNeedsRelaxation(const MCFixup &Fixup, uint64_t Value,
+                            const MCRelaxableFragment *DF,
+                            const MCAsmLayout &Layout) const override;
+
+  void relaxInstruction(const MCInst &Inst, MCInst &Res) const override;
+
+  bool writeNopData(uint64_t Count, MCObjectWriter *OW) const override;
+
+  void handleAssemblerFlag(MCAssemblerFlag Flag) override;
+
+  unsigned getPointerSize() const { return 4; }
+  bool isThumb() const { return isThumbMode; }
+  void setIsThumb(bool it) { isThumbMode = it; }
+  bool isLittle() const { return IsLittleEndian; }
+};
+} // end anonymous namespace
+
+#endif