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//===-- 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 EmitInstruction(const MachineInstr *MI);
};
} // 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);
}
// 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));
}
// 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);
}
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