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 "MSP430MCInstLower.h" 19#include "MSP430TargetMachine.h" 20#include "InstPrinter/MSP430InstPrinter.h" 21#include "llvm/Constants.h" 22#include "llvm/DerivedTypes.h" 23#include "llvm/Module.h" 24#include "llvm/Assembly/Writer.h" 25#include "llvm/CodeGen/AsmPrinter.h" 26#include "llvm/CodeGen/MachineModuleInfo.h" 27#include "llvm/CodeGen/MachineFunctionPass.h" 28#include "llvm/CodeGen/MachineConstantPool.h" 29#include "llvm/CodeGen/MachineInstr.h" 30#include "llvm/MC/MCAsmInfo.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/Support/TargetRegistry.h" 36#include "llvm/Support/raw_ostream.h" 37using namespace llvm; 38 39namespace { 40 class MSP430AsmPrinter : public AsmPrinter { 41 public: 42 MSP430AsmPrinter(TargetMachine &TM, MCStreamer &Streamer) 43 : AsmPrinter(TM, Streamer) {} 44 45 virtual const char *getPassName() const { 46 return "MSP430 Assembly Printer"; 47 } 48 49 void printOperand(const MachineInstr *MI, int OpNum, 50 raw_ostream &O, const char* Modifier = 0); 51 void printSrcMemOperand(const MachineInstr *MI, int OpNum, 52 raw_ostream &O); 53 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, 54 unsigned AsmVariant, const char *ExtraCode, 55 raw_ostream &O); 56 bool PrintAsmMemoryOperand(const MachineInstr *MI, 57 unsigned OpNo, unsigned AsmVariant, 58 const char *ExtraCode, raw_ostream &O); 59 void EmitInstruction(const MachineInstr *MI); 60 }; 61} // end of anonymous namespace 62 63 64void MSP430AsmPrinter::printOperand(const MachineInstr *MI, int OpNum, 65 raw_ostream &O, const char *Modifier) { 66 const MachineOperand &MO = MI->getOperand(OpNum); 67 switch (MO.getType()) { 68 default: llvm_unreachable("Not implemented yet!"); 69 case MachineOperand::MO_Register: 70 O << MSP430InstPrinter::getRegisterName(MO.getReg()); 71 return; 72 case MachineOperand::MO_Immediate: 73 if (!Modifier || strcmp(Modifier, "nohash")) 74 O << '#'; 75 O << MO.getImm(); 76 return; 77 case MachineOperand::MO_MachineBasicBlock: 78 O << *MO.getMBB()->getSymbol(); 79 return; 80 case MachineOperand::MO_GlobalAddress: { 81 bool isMemOp = Modifier && !strcmp(Modifier, "mem"); 82 uint64_t Offset = MO.getOffset(); 83 84 // If the global address expression is a part of displacement field with a 85 // register base, we should not emit any prefix symbol here, e.g. 86 // mov.w &foo, r1 87 // vs 88 // mov.w glb(r1), r2 89 // Otherwise (!) msp430-as will silently miscompile the output :( 90 if (!Modifier || strcmp(Modifier, "nohash")) 91 O << (isMemOp ? '&' : '#'); 92 if (Offset) 93 O << '(' << Offset << '+'; 94 95 O << *Mang->getSymbol(MO.getGlobal()); 96 97 if (Offset) 98 O << ')'; 99 100 return; 101 } 102 case MachineOperand::MO_ExternalSymbol: { 103 bool isMemOp = Modifier && !strcmp(Modifier, "mem"); 104 O << (isMemOp ? '&' : '#'); 105 O << MAI->getGlobalPrefix() << MO.getSymbolName(); 106 return; 107 } 108 } 109} 110 111void MSP430AsmPrinter::printSrcMemOperand(const MachineInstr *MI, int OpNum, 112 raw_ostream &O) { 113 const MachineOperand &Base = MI->getOperand(OpNum); 114 const MachineOperand &Disp = MI->getOperand(OpNum+1); 115 116 // Print displacement first 117 118 // Imm here is in fact global address - print extra modifier. 119 if (Disp.isImm() && !Base.getReg()) 120 O << '&'; 121 printOperand(MI, OpNum+1, O, "nohash"); 122 123 // Print register base field 124 if (Base.getReg()) { 125 O << '('; 126 printOperand(MI, OpNum, O); 127 O << ')'; 128 } 129} 130 131/// PrintAsmOperand - Print out an operand for an inline asm expression. 132/// 133bool MSP430AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, 134 unsigned AsmVariant, 135 const char *ExtraCode, raw_ostream &O) { 136 // Does this asm operand have a single letter operand modifier? 137 if (ExtraCode && ExtraCode[0]) 138 return true; // Unknown modifier. 139 140 printOperand(MI, OpNo, O); 141 return false; 142} 143 144bool MSP430AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, 145 unsigned OpNo, unsigned AsmVariant, 146 const char *ExtraCode, 147 raw_ostream &O) { 148 if (ExtraCode && ExtraCode[0]) { 149 return true; // Unknown modifier. 150 } 151 printSrcMemOperand(MI, OpNo, O); 152 return false; 153} 154 155//===----------------------------------------------------------------------===// 156void MSP430AsmPrinter::EmitInstruction(const MachineInstr *MI) { 157 MSP430MCInstLower MCInstLowering(OutContext, *Mang, *this); 158 159 MCInst TmpInst; 160 MCInstLowering.Lower(MI, TmpInst); 161 OutStreamer.EmitInstruction(TmpInst); 162} 163 164// Force static initialization. 165extern "C" void LLVMInitializeMSP430AsmPrinter() { 166 RegisterAsmPrinter<MSP430AsmPrinter> X(TheMSP430Target); 167} 168