+++ /dev/null
-//===-- 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 "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/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 printInstruction(const MachineInstr *MI, raw_ostream &O);
- void EmitInstruction(const MachineInstr *MI) {
- SmallString<128> Str;
- raw_svector_ostream OS(Str);
- printInstruction(MI, OS);
- OutStreamer.EmitRawText(OS.str());
- }
- virtual void EmitFunctionBodyStart();
- virtual void EmitFunctionBodyEnd();
- static const char *getRegisterName(unsigned RegNo);
-
- 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.
-//
-//===----------------------------------------------------------------------===//
-
-//===----------------------------------------------------------------------===//
-// 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(getRegisterName(stackReg)) +
- "," + Twine(stackSize) + "," +
- Twine(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 << 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);
-}
-
-// Force static initialization.
-extern "C" void LLVMInitializeMBlazeAsmPrinter() {
- RegisterAsmPrinter<MBlazeAsmPrinter> X(TheMBlazeTarget);
-}
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