Recommit 116986 with capitalization typo fixed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116993 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 314 insertions, 0 deletions

diff --git a/lib/Target/MBlaze/MBlazeAsmPrinter.cpp b/lib/Target/MBlaze/MBlazeAsmPrinter.cpp
new file mode 100644
index 0000000000..c1ae4502ad
--- /dev/null
+++ b/lib/Target/MBlaze/MBlazeAsmPrinter.cpp
@@ -0,0 +1,314 @@
+//===-- MBlazeAsmPrinter.cpp - MBlaze LLVM assembly writer ----------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains a printer that converts from our internal representation
+// of machine-dependent LLVM code to GAS-format MBlaze assembly language.
+//
+//===----------------------------------------------------------------------===//
+
+#define DEBUG_TYPE "mblaze-asm-printer"
+
+#include "MBlaze.h"
+#include "MBlazeSubtarget.h"
+#include "MBlazeInstrInfo.h"
+#include "MBlazeTargetMachine.h"
+#include "MBlazeMachineFunction.h"
+#include "MBlazeMCInstLower.h"
+#include "InstPrinter/MBlazeInstPrinter.h"
+#include "llvm/Constants.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/Module.h"
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/CodeGen/MachineFunctionPass.h"
+#include "llvm/CodeGen/MachineConstantPool.h"
+#include "llvm/CodeGen/MachineFrameInfo.h"
+#include "llvm/CodeGen/MachineInstr.h"
+#include "llvm/MC/MCInst.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/Target/Mangler.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/Target/TargetLoweringObjectFile.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetOptions.h"
+#include "llvm/Target/TargetRegistry.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/raw_ostream.h"
+#include <cctype>
+
+using namespace llvm;
+
+namespace {
+  class MBlazeAsmPrinter : public AsmPrinter {
+    const MBlazeSubtarget *Subtarget;
+  public:
+    explicit MBlazeAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
+      : AsmPrinter(TM, Streamer) {
+      Subtarget = &TM.getSubtarget<MBlazeSubtarget>();
+    }
+
+    virtual const char *getPassName() const {
+      return "MBlaze Assembly Printer";
+    }
+
+    bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
+                         unsigned AsmVariant, const char *ExtraCode,
+                         raw_ostream &O);
+    void printOperand(const MachineInstr *MI, int opNum, raw_ostream &O);
+    void printUnsignedImm(const MachineInstr *MI, int opNum, raw_ostream &O);
+    void printFSLImm(const MachineInstr *MI, int opNum, raw_ostream &O);
+    void printMemOperand(const MachineInstr *MI, int opNum, raw_ostream &O,
+                         const char *Modifier = 0);
+    void printSavedRegsBitmask(raw_ostream &OS);
+
+    void emitFrameDirective();
+
+    void EmitInstruction(const MachineInstr *MI); 
+    virtual void EmitFunctionBodyStart();
+    virtual void EmitFunctionBodyEnd();
+
+    virtual void EmitFunctionEntryLabel();
+  };
+} // end of anonymous namespace
+
+// #include "MBlazeGenAsmWriter.inc"
+
+//===----------------------------------------------------------------------===//
+//
+//  MBlaze Asm Directives
+//
+//  -- Frame directive "frame Stackpointer, Stacksize, RARegister"
+//  Describe the stack frame.
+//
+//  -- Mask directives "mask  bitmask, offset"
+//  Tells the assembler which registers are saved and where.
+//  bitmask - contain a little endian bitset indicating which registers are
+//            saved on function prologue (e.g. with a 0x80000000 mask, the
+//            assembler knows the register 31 (RA) is saved at prologue.
+//  offset  - the position before stack pointer subtraction indicating where
+//            the first saved register on prologue is located. (e.g. with a
+//
+//  Consider the following function prologue:
+//
+//    .frame  R19,48,R15
+//    .mask   0xc0000000,-8
+//       addiu R1, R1, -48
+//       sw R15, 40(R1)
+//       sw R19, 36(R1)
+//
+//    With a 0xc0000000 mask, the assembler knows the register 15 (R15) and
+//    19 (R19) are saved at prologue. As the save order on prologue is from
+//    left to right, R15 is saved first. A -8 offset means that after the
+//    stack pointer subtration, the first register in the mask (R15) will be
+//    saved at address 48-8=40.
+//
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+void MBlazeAsmPrinter::EmitInstruction(const MachineInstr *MI) {
+  MBlazeMCInstLower MCInstLowering(OutContext, *Mang, *this);
+
+  MCInst TmpInst;
+  MCInstLowering.Lower(MI, TmpInst);
+  OutStreamer.EmitInstruction(TmpInst);
+}
+
+//===----------------------------------------------------------------------===//
+// Mask directives
+//===----------------------------------------------------------------------===//
+
+// Print a 32 bit hex number with all numbers.
+static void printHex32(unsigned int Value, raw_ostream &O) {
+  O << "0x";
+  for (int i = 7; i >= 0; i--)
+    O << utohexstr((Value & (0xF << (i*4))) >> (i*4));
+}
+
+
+// Create a bitmask with all callee saved registers for CPU or Floating Point
+// registers. For CPU registers consider RA, GP and FP for saving if necessary.
+void MBlazeAsmPrinter::printSavedRegsBitmask(raw_ostream &O) {
+  const TargetRegisterInfo &RI = *TM.getRegisterInfo();
+  const MBlazeFunctionInfo *MBlazeFI = MF->getInfo<MBlazeFunctionInfo>();
+
+  // CPU Saved Registers Bitmasks
+  unsigned int CPUBitmask = 0;
+
+  // Set the CPU Bitmasks
+  const MachineFrameInfo *MFI = MF->getFrameInfo();
+  const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
+  for (unsigned i = 0, e = CSI.size(); i != e; ++i) {
+    unsigned Reg = CSI[i].getReg();
+    unsigned RegNum = MBlazeRegisterInfo::getRegisterNumbering(Reg);
+    if (MBlaze::CPURegsRegisterClass->contains(Reg))
+      CPUBitmask |= (1 << RegNum);
+  }
+
+  // Return Address and Frame registers must also be set in CPUBitmask.
+  if (RI.hasFP(*MF))
+    CPUBitmask |= (1 << MBlazeRegisterInfo::
+                getRegisterNumbering(RI.getFrameRegister(*MF)));
+
+  if (MFI->adjustsStack())
+    CPUBitmask |= (1 << MBlazeRegisterInfo::
+                getRegisterNumbering(RI.getRARegister()));
+
+  // Print CPUBitmask
+  O << "\t.mask \t"; printHex32(CPUBitmask, O);
+  O << ',' << MBlazeFI->getCPUTopSavedRegOff() << '\n';
+}
+
+//===----------------------------------------------------------------------===//
+// Frame and Set directives
+//===----------------------------------------------------------------------===//
+
+/// Frame Directive
+void MBlazeAsmPrinter::emitFrameDirective() {
+  // const TargetRegisterInfo &RI = *TM.getRegisterInfo();
+
+  // unsigned stackReg  = RI.getFrameRegister(*MF);
+  // unsigned returnReg = RI.getRARegister();
+  // unsigned stackSize = MF->getFrameInfo()->getStackSize();
+
+
+  /*
+  OutStreamer.EmitRawText("\t.frame\t" + 
+                          Twine(MBlazeInstPrinter::getRegisterName(stackReg)) +
+                          "," + Twine(stackSize) + "," +
+                          Twine(MBlazeInstPrinter::getRegisterName(returnReg)));
+  */
+}
+
+void MBlazeAsmPrinter::EmitFunctionEntryLabel() {
+  // OutStreamer.EmitRawText("\t.ent\t" + Twine(CurrentFnSym->getName()));
+  OutStreamer.EmitLabel(CurrentFnSym);
+}
+
+/// EmitFunctionBodyStart - Targets can override this to emit stuff before
+/// the first basic block in the function.
+void MBlazeAsmPrinter::EmitFunctionBodyStart() {
+  // emitFrameDirective();
+  
+  // SmallString<128> Str;
+  // raw_svector_ostream OS(Str);
+  // printSavedRegsBitmask(OS);
+  // OutStreamer.EmitRawText(OS.str());
+}
+
+/// EmitFunctionBodyEnd - Targets can override this to emit stuff after
+/// the last basic block in the function.
+void MBlazeAsmPrinter::EmitFunctionBodyEnd() {
+  // OutStreamer.EmitRawText("\t.end\t" + Twine(CurrentFnSym->getName()));
+}
+
+// Print out an operand for an inline asm expression.
+bool MBlazeAsmPrinter::
+PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
+                unsigned AsmVariant,const char *ExtraCode, raw_ostream &O) {
+  // Does this asm operand have a single letter operand modifier?
+  if (ExtraCode && ExtraCode[0])
+    return true; // Unknown modifier.
+
+  printOperand(MI, OpNo, O);
+  return false;
+}
+
+void MBlazeAsmPrinter::printOperand(const MachineInstr *MI, int opNum,
+                                    raw_ostream &O) {
+  const MachineOperand &MO = MI->getOperand(opNum);
+
+  switch (MO.getType()) {
+  case MachineOperand::MO_Register:
+    O << MBlazeInstPrinter::getRegisterName(MO.getReg());
+    break;
+
+  case MachineOperand::MO_Immediate:
+    O << (int)MO.getImm();
+    break;
+
+  case MachineOperand::MO_FPImmediate: {
+    const ConstantFP *fp = MO.getFPImm();
+    printHex32(fp->getValueAPF().bitcastToAPInt().getZExtValue(), O);
+    O << ";\t# immediate = " << *fp;
+    break;
+  }
+
+  case MachineOperand::MO_MachineBasicBlock:
+    O << *MO.getMBB()->getSymbol();
+    return;
+
+  case MachineOperand::MO_GlobalAddress:
+    O << *Mang->getSymbol(MO.getGlobal());
+    break;
+
+  case MachineOperand::MO_ExternalSymbol:
+    O << *GetExternalSymbolSymbol(MO.getSymbolName());
+    break;
+
+  case MachineOperand::MO_JumpTableIndex:
+    O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
+      << '_' << MO.getIndex();
+    break;
+
+  case MachineOperand::MO_ConstantPoolIndex:
+    O << MAI->getPrivateGlobalPrefix() << "CPI"
+      << getFunctionNumber() << "_" << MO.getIndex();
+    if (MO.getOffset())
+      O << "+" << MO.getOffset();
+    break;
+
+  default:
+    llvm_unreachable("<unknown operand type>");
+  }
+}
+
+void MBlazeAsmPrinter::printUnsignedImm(const MachineInstr *MI, int opNum,
+                                        raw_ostream &O) {
+  const MachineOperand &MO = MI->getOperand(opNum);
+  if (MO.isImm())
+    O << (unsigned int)MO.getImm();
+  else
+    printOperand(MI, opNum, O);
+}
+
+void MBlazeAsmPrinter::printFSLImm(const MachineInstr *MI, int opNum,
+                                   raw_ostream &O) {
+  const MachineOperand &MO = MI->getOperand(opNum);
+  if (MO.isImm())
+    O << "rfsl" << (unsigned int)MO.getImm();
+  else
+    printOperand(MI, opNum, O);
+}
+
+void MBlazeAsmPrinter::
+printMemOperand(const MachineInstr *MI, int opNum, raw_ostream &O,
+                const char *Modifier) {
+  printOperand(MI, opNum+1, O);
+  O << ", ";
+  printOperand(MI, opNum, O);
+}
+
+static MCInstPrinter *createMBlazeMCInstPrinter(const Target &T,
+                                                unsigned SyntaxVariant,
+                                                const MCAsmInfo &MAI) {
+  if (SyntaxVariant == 0)
+    return new MBlazeInstPrinter(MAI);
+  return 0;
+}
+
+// Force static initialization.
+extern "C" void LLVMInitializeMBlazeAsmPrinter() {
+  RegisterAsmPrinter<MBlazeAsmPrinter> X(TheMBlazeTarget);
+  TargetRegistry::RegisterMCInstPrinter(TheMBlazeTarget,
+                                        createMBlazeMCInstPrinter);
+
+}