[Sparc] Add initial implementation of MC Code emitter for sparc.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198533 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/Sparc/MCTargetDesc/CMakeLists.txt

@@ -1,6 +1,8 @@
 add_llvm_library(LLVMSparcDesc
-  SparcMCTargetDesc.cpp
+  SparcAsmBackend.cpp
   SparcMCAsmInfo.cpp
+  SparcMCCodeEmitter.cpp
+  SparcMCTargetDesc.cpp
   SparcMCExpr.cpp
   SparcTargetStreamer.cpp
   )

lib/Target/Sparc/MCTargetDesc/SparcAsmBackend.cpp

@@ -0,0 +1,101 @@
+//===-- SparcAsmBackend.cpp - Sparc 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/MC/MCAsmBackend.h"
+#include "MCTargetDesc/SparcMCTargetDesc.h"
+#include "MCTargetDesc/SparcFixupKinds.h"
+#include "llvm/MC/MCFixupKindInfo.h"
+#include "llvm/MC/MCObjectWriter.h"
+#include "llvm/Support/TargetRegistry.h"
+
+using namespace llvm;
+
+namespace {
+  class SparcAsmBackend : public MCAsmBackend {
+
+  public:
+    SparcAsmBackend(const Target &T) : MCAsmBackend() {}
+
+    unsigned getNumFixupKinds() const {
+      return Sparc::NumTargetFixupKinds;
+    }
+
+    const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const {
+      const static MCFixupKindInfo Infos[Sparc::NumTargetFixupKinds] = {
+        // name                    offset bits  flags
+        { "fixup_sparc_call30",     0,     30,  MCFixupKindInfo::FKF_IsPCRel },
+        { "fixup_sparc_br22",       0,     22,  MCFixupKindInfo::FKF_IsPCRel },
+        { "fixup_sparc_br19",       0,     19,  MCFixupKindInfo::FKF_IsPCRel }
+      };
+
+      if (Kind < FirstTargetFixupKind)
+        return MCAsmBackend::getFixupKindInfo(Kind);
+
+      assert(unsigned(Kind - FirstTargetFixupKind) < getNumFixupKinds() &&
+             "Invalid kind!");
+      return Infos[Kind - FirstTargetFixupKind];
+    }
+
+    bool mayNeedRelaxation(const MCInst &Inst) const {
+      // FIXME.
+      return false;
+    }
+
+    /// fixupNeedsRelaxation - Target specific predicate for whether a given
+    /// fixup requires the associated instruction to be relaxed.
+    bool fixupNeedsRelaxation(const MCFixup &Fixup,
+                              uint64_t Value,
+                              const MCRelaxableFragment *DF,
+                              const MCAsmLayout &Layout) const {
+      // FIXME.
+      assert(0 && "fixupNeedsRelaxation() unimplemented");
+      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.
+      for (uint64_t i = 0; i != Count; ++i)
+        OW->Write8(0);
+      return true;
+    }
+  };
+
+  class ELFSparcAsmBackend : public SparcAsmBackend {
+  public:
+    ELFSparcAsmBackend(const Target &T, Triple::OSType OSType) :
+      SparcAsmBackend(T) { }
+
+    void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
+                    uint64_t Value) const {
+      assert(0 && "applyFixup not implemented yet");
+    }
+
+    MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
+      assert(0 && "Object Writer not implemented yet");
+      return 0;
+    }
+
+    virtual bool doesSectionRequireSymbols(const MCSection &Section) const {
+      return false;
+    }
+  };
+
+} // end anonymous namespace
+
+
+MCAsmBackend *llvm::createSparcAsmBackend(const Target &T,
+                                          const MCRegisterInfo &MRI,
+                                          StringRef TT,
+                                          StringRef CPU) {
+  return new ELFSparcAsmBackend(T, Triple(TT).getOS());
+}

lib/Target/Sparc/MCTargetDesc/SparcFixupKinds.h

@@ -0,0 +1,36 @@
+//===-- SparcFixupKinds.h - Sparc Specific Fixup Entries --------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SPARC_FIXUPKINDS_H
+#define LLVM_SPARC_FIXUPKINDS_H
+
+#include "llvm/MC/MCFixup.h"
+
+namespace llvm {
+  namespace Sparc {
+    enum Fixups {
+      // fixup_sparc_call30 - 30-bit PC relative relocation for call
+      fixup_sparc_call30 = FirstTargetFixupKind,
+
+      /// fixup_sparc_br22 - 22-bit PC relative relocation for
+      /// branches
+      fixup_sparc_br22,
+
+      /// fixup_sparc_br22 - 22-bit PC relative relocation for
+      /// branches on icc/xcc
+      fixup_sparc_br19,
+
+      // Marker
+      LastTargetFixupKind,
+      NumTargetFixupKinds = LastTargetFixupKind - FirstTargetFixupKind
+    };
+  }
+}
+
+#endif

lib/Target/Sparc/MCTargetDesc/SparcMCCodeEmitter.cpp

@@ -0,0 +1,131 @@
+//===-- SparcMCCodeEmitter.cpp - Convert Sparc code to machine code -------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the SparcMCCodeEmitter class.
+//
+//===----------------------------------------------------------------------===//
+
+#define DEBUG_TYPE "mccodeemitter"
+#include "SparcMCTargetDesc.h"
+#include "MCTargetDesc/SparcFixupKinds.h"
+#include "llvm/MC/MCCodeEmitter.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCInst.h"
+#include "llvm/MC/MCRegisterInfo.h"
+#include "llvm/ADT/Statistic.h"
+#include "llvm/Support/raw_ostream.h"
+
+using namespace llvm;
+
+STATISTIC(MCNumEmitted, "Number of MC instructions emitted");
+
+namespace {
+class SparcMCCodeEmitter : public MCCodeEmitter {
+  SparcMCCodeEmitter(const SparcMCCodeEmitter &) LLVM_DELETED_FUNCTION;
+  void operator=(const SparcMCCodeEmitter &) LLVM_DELETED_FUNCTION;
+  MCContext &Ctx;
+
+public:
+  SparcMCCodeEmitter(MCContext &ctx): Ctx(ctx) {}
+
+  ~SparcMCCodeEmitter() {}
+
+  void EncodeInstruction(const MCInst &MI, raw_ostream &OS,
+                         SmallVectorImpl<MCFixup> &Fixups) const;
+
+  // getBinaryCodeForInstr - TableGen'erated function for getting the
+  // binary encoding for an instruction.
+  uint64_t getBinaryCodeForInstr(const MCInst &MI,
+                                 SmallVectorImpl<MCFixup> &Fixups) const;
+
+  /// getMachineOpValue - Return binary encoding of operand. If the machine
+  /// operand requires relocation, record the relocation and return zero.
+  unsigned getMachineOpValue(const MCInst &MI, const MCOperand &MO,
+                             SmallVectorImpl<MCFixup> &Fixups) const;
+
+  unsigned getCallTargetOpValue(const MCInst &MI, unsigned OpNo,
+                             SmallVectorImpl<MCFixup> &Fixups) const;
+  unsigned getBranchTargetOpValue(const MCInst &MI, unsigned OpNo,
+                             SmallVectorImpl<MCFixup> &Fixups) const;
+
+};
+} // end anonymous namespace
+
+MCCodeEmitter *llvm::createSparcMCCodeEmitter(const MCInstrInfo &MCII,
+                                              const MCRegisterInfo &MRI,
+                                              const MCSubtargetInfo &STI,
+                                              MCContext &Ctx) {
+  return new SparcMCCodeEmitter(Ctx);
+}
+
+void SparcMCCodeEmitter::
+EncodeInstruction(const MCInst &MI, raw_ostream &OS,
+                  SmallVectorImpl<MCFixup> &Fixups) const {
+  unsigned Bits = getBinaryCodeForInstr(MI, Fixups);
+
+  // Output the constant in big endian byte order.
+  for (unsigned i = 0; i != 4; ++i) {
+    OS << (char)(Bits >> 24);
+    Bits <<= 8;
+  }
+
+  ++MCNumEmitted;  // Keep track of the # of mi's emitted.
+}
+
+
+unsigned SparcMCCodeEmitter::
+getMachineOpValue(const MCInst &MI, const MCOperand &MO,
+                  SmallVectorImpl<MCFixup> &Fixups) const {
+
+  if (MO.isReg())
+    return Ctx.getRegisterInfo()->getEncodingValue(MO.getReg());
+
+  if (MO.isImm())
+    return MO.getImm();
+
+  assert(MO.isExpr());
+  const MCExpr *Expr = MO.getExpr();
+  int64_t Res;
+  if (Expr->EvaluateAsAbsolute(Res))
+    return Res;
+
+  assert(0 && "Unhandled expression!");
+  return 0;
+}
+
+unsigned SparcMCCodeEmitter::
+getCallTargetOpValue(const MCInst &MI, unsigned OpNo,
+                     SmallVectorImpl<MCFixup> &Fixups) const {
+  const MCOperand &MO = MI.getOperand(OpNo);
+  if (MO.isReg() || MO.isImm())
+    return getMachineOpValue(MI, MO, Fixups);
+
+  Fixups.push_back(MCFixup::Create(0, MO.getExpr(),
+                                   (MCFixupKind)Sparc::fixup_sparc_call30));
+  return 0;
+}
+
+unsigned SparcMCCodeEmitter::
+getBranchTargetOpValue(const MCInst &MI, unsigned OpNo,
+                  SmallVectorImpl<MCFixup> &Fixups) const {
+  const MCOperand &MO = MI.getOperand(OpNo);
+  if (MO.isReg() || MO.isImm())
+    return getMachineOpValue(MI, MO, Fixups);
+
+  Sparc::Fixups fixup = Sparc::fixup_sparc_br22;
+  if (MI.getOpcode() == SP::BPXCC)
+    fixup = Sparc::fixup_sparc_br19;
+
+  Fixups.push_back(MCFixup::Create(0, MO.getExpr(),
+                                   (MCFixupKind)fixup));
+  return 0;
+}
+
+#include "SparcGenMCCodeEmitter.inc"

lib/Target/Sparc/MCTargetDesc/SparcMCTargetDesc.cpp

@@ -136,6 +136,18 @@ extern "C" void LLVMInitializeSparcTargetMC() {
   TargetRegistry::RegisterMCSubtargetInfo(TheSparcV9Target,
                                           createSparcMCSubtargetInfo);
 
+  // Register the MC Code Emitter.
+  TargetRegistry::RegisterMCCodeEmitter(TheSparcTarget,
+                                        createSparcMCCodeEmitter);
+  TargetRegistry::RegisterMCCodeEmitter(TheSparcV9Target,
+                                        createSparcMCCodeEmitter);
+
+  //Register the asm backend.
+  TargetRegistry::RegisterMCAsmBackend(TheSparcTarget,
+                                       createSparcAsmBackend);
+  TargetRegistry::RegisterMCAsmBackend(TheSparcV9Target,
+                                       createSparcAsmBackend);
+
   TargetRegistry::RegisterAsmStreamer(TheSparcTarget,
                                       createMCAsmStreamer);
   TargetRegistry::RegisterAsmStreamer(TheSparcV9Target,

lib/Target/Sparc/MCTargetDesc/SparcMCTargetDesc.h

@@ -15,11 +15,27 @@
 #define SPARCMCTARGETDESC_H
 
 namespace llvm {
+class MCAsmBackend;
+class MCCodeEmitter;
+class MCContext;
+class MCInstrInfo;
+class MCRegisterInfo;
+class MCSubtargetInfo;
 class Target;
+class StringRef;
 
 extern Target TheSparcTarget;
 extern Target TheSparcV9Target;
 
+MCCodeEmitter *createSparcMCCodeEmitter(const MCInstrInfo &MCII,
+                                        const MCRegisterInfo &MRI,
+                                        const MCSubtargetInfo &STI,
+                                        MCContext &Ctx);
+MCAsmBackend *createSparcAsmBackend(const Target &T,
+                                    const MCRegisterInfo &MRI,
+                                    StringRef TT,
+                                    StringRef CPU);
+
 } // End llvm namespace
 
 // Defines symbolic names for Sparc registers.  This defines a mapping from