MSP430AsmPrinter.cpp revision 6314ef9e8100c889956bd26ba71cc04e06564568
1//===-- MSP430AsmPrinter.cpp - MSP430 LLVM assembly writer ----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file contains a printer that converts from our internal representation 11// of machine-dependent LLVM code to the MSP430 assembly language. 12// 13//===----------------------------------------------------------------------===// 14 15#define DEBUG_TYPE "asm-printer" 16#include "MSP430.h" 17#include "MSP430InstrInfo.h" 18#include "AsmPrinter/MSP430InstPrinter.h" 19#include "MSP430MCAsmInfo.h" 20#include "MSP430MCInstLower.h" 21#include "MSP430TargetMachine.h" 22#include "llvm/Constants.h" 23#include "llvm/DerivedTypes.h" 24#include "llvm/Module.h" 25#include "llvm/Assembly/Writer.h" 26#include "llvm/CodeGen/AsmPrinter.h" 27#include "llvm/CodeGen/MachineModuleInfo.h" 28#include "llvm/CodeGen/MachineFunctionPass.h" 29#include "llvm/CodeGen/MachineConstantPool.h" 30#include "llvm/CodeGen/MachineInstr.h" 31#include "llvm/MC/MCInst.h" 32#include "llvm/MC/MCStreamer.h" 33#include "llvm/MC/MCSymbol.h" 34#include "llvm/Target/Mangler.h" 35#include "llvm/Target/TargetData.h" 36#include "llvm/Target/TargetLoweringObjectFile.h" 37#include "llvm/Target/TargetRegistry.h" 38#include "llvm/Support/raw_ostream.h" 39using namespace llvm; 40 41namespace { 42 class MSP430AsmPrinter : public AsmPrinter { 43 public: 44 MSP430AsmPrinter(TargetMachine &TM, MCStreamer &Streamer) 45 : AsmPrinter(TM, Streamer) {} 46 47 virtual const char *getPassName() const { 48 return "MSP430 Assembly Printer"; 49 } 50 51 void printOperand(const MachineInstr *MI, int OpNum, 52 raw_ostream &O, const char* Modifier = 0); 53 void printSrcMemOperand(const MachineInstr *MI, int OpNum, 54 raw_ostream &O); 55 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, 56 unsigned AsmVariant, const char *ExtraCode, 57 raw_ostream &O); 58 bool PrintAsmMemoryOperand(const MachineInstr *MI, 59 unsigned OpNo, unsigned AsmVariant, 60 const char *ExtraCode, raw_ostream &O); 61 void EmitInstruction(const MachineInstr *MI); 62 }; 63} // end of anonymous namespace 64 65 66void MSP430AsmPrinter::printOperand(const MachineInstr *MI, int OpNum, 67 raw_ostream &O, const char *Modifier) { 68 const MachineOperand &MO = MI->getOperand(OpNum); 69 switch (MO.getType()) { 70 default: assert(0 && "Not implemented yet!"); 71 case MachineOperand::MO_Register: 72 O << MSP430InstPrinter::getRegisterName(MO.getReg()); 73 return; 74 case MachineOperand::MO_Immediate: 75 if (!Modifier || strcmp(Modifier, "nohash")) 76 O << '#'; 77 O << MO.getImm(); 78 return; 79 case MachineOperand::MO_MachineBasicBlock: 80 O << *MO.getMBB()->getSymbol(); 81 return; 82 case MachineOperand::MO_GlobalAddress: { 83 bool isMemOp = Modifier && !strcmp(Modifier, "mem"); 84 uint64_t Offset = MO.getOffset(); 85 86 // If the global address expression is a part of displacement field with a 87 // register base, we should not emit any prefix symbol here, e.g. 88 // mov.w &foo, r1 89 // vs 90 // mov.w glb(r1), r2 91 // Otherwise (!) msp430-as will silently miscompile the output :( 92 if (!Modifier || strcmp(Modifier, "nohash")) 93 O << (isMemOp ? '&' : '#'); 94 if (Offset) 95 O << '(' << Offset << '+'; 96 97 O << *Mang->getSymbol(MO.getGlobal()); 98 99 if (Offset) 100 O << ')'; 101 102 return; 103 } 104 case MachineOperand::MO_ExternalSymbol: { 105 bool isMemOp = Modifier && !strcmp(Modifier, "mem"); 106 O << (isMemOp ? '&' : '#'); 107 O << MAI->getGlobalPrefix() << MO.getSymbolName(); 108 return; 109 } 110 } 111} 112 113void MSP430AsmPrinter::printSrcMemOperand(const MachineInstr *MI, int OpNum, 114 raw_ostream &O) { 115 const MachineOperand &Base = MI->getOperand(OpNum); 116 const MachineOperand &Disp = MI->getOperand(OpNum+1); 117 118 // Print displacement first 119 120 // Imm here is in fact global address - print extra modifier. 121 if (Disp.isImm() && !Base.getReg()) 122 O << '&'; 123 printOperand(MI, OpNum+1, O, "nohash"); 124 125 // Print register base field 126 if (Base.getReg()) { 127 O << '('; 128 printOperand(MI, OpNum, O); 129 O << ')'; 130 } 131} 132 133/// PrintAsmOperand - Print out an operand for an inline asm expression. 134/// 135bool MSP430AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, 136 unsigned AsmVariant, 137 const char *ExtraCode, raw_ostream &O) { 138 // Does this asm operand have a single letter operand modifier? 139 if (ExtraCode && ExtraCode[0]) 140 return true; // Unknown modifier. 141 142 printOperand(MI, OpNo, O); 143 return false; 144} 145 146bool MSP430AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, 147 unsigned OpNo, unsigned AsmVariant, 148 const char *ExtraCode, 149 raw_ostream &O) { 150 if (ExtraCode && ExtraCode[0]) { 151 return true; // Unknown modifier. 152 } 153 printSrcMemOperand(MI, OpNo, O); 154 return false; 155} 156 157//===----------------------------------------------------------------------===// 158void MSP430AsmPrinter::EmitInstruction(const MachineInstr *MI) { 159 MSP430MCInstLower MCInstLowering(OutContext, *Mang, *this); 160 161 MCInst TmpInst; 162 MCInstLowering.Lower(MI, TmpInst); 163 OutStreamer.EmitInstruction(TmpInst); 164} 165 166static MCInstPrinter *createMSP430MCInstPrinter(const Target &T, 167 unsigned SyntaxVariant, 168 const MCAsmInfo &MAI) { 169 if (SyntaxVariant == 0) 170 return new MSP430InstPrinter(MAI); 171 return 0; 172} 173 174// Force static initialization. 175extern "C" void LLVMInitializeMSP430AsmPrinter() { 176 RegisterAsmPrinter<MSP430AsmPrinter> X(TheMSP430Target); 177 TargetRegistry::RegisterMCInstPrinter(TheMSP430Target, 178 createMSP430MCInstPrinter); 179} 180