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 #include "MSP430.h"
16 #include "InstPrinter/MSP430InstPrinter.h"
17 #include "MSP430InstrInfo.h"
18 #include "MSP430MCInstLower.h"
19 #include "MSP430TargetMachine.h"
20 #include "llvm/CodeGen/AsmPrinter.h"
21 #include "llvm/CodeGen/MachineConstantPool.h"
22 #include "llvm/CodeGen/MachineFunctionPass.h"
23 #include "llvm/CodeGen/MachineInstr.h"
24 #include "llvm/CodeGen/MachineModuleInfo.h"
25 #include "llvm/IR/Constants.h"
26 #include "llvm/IR/DerivedTypes.h"
27 #include "llvm/IR/Mangler.h"
28 #include "llvm/IR/Module.h"
29 #include "llvm/MC/MCAsmInfo.h"
30 #include "llvm/MC/MCInst.h"
31 #include "llvm/MC/MCStreamer.h"
32 #include "llvm/MC/MCSymbol.h"
33 #include "llvm/Support/TargetRegistry.h"
34 #include "llvm/Support/raw_ostream.h"
35 using namespace llvm;
36
37 #define DEBUG_TYPE "asm-printer"
38
39 namespace {
40 class MSP430AsmPrinter : public AsmPrinter {
41 public:
MSP430AsmPrinter(TargetMachine & TM,std::unique_ptr<MCStreamer> Streamer)42 MSP430AsmPrinter(TargetMachine &TM, std::unique_ptr<MCStreamer> Streamer)
43 : AsmPrinter(TM, std::move(Streamer)) {}
44
getPassName() const45 const char *getPassName() const override {
46 return "MSP430 Assembly Printer";
47 }
48
49 void printOperand(const MachineInstr *MI, int OpNum,
50 raw_ostream &O, const char* Modifier = nullptr);
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) override;
56 bool PrintAsmMemoryOperand(const MachineInstr *MI,
57 unsigned OpNo, unsigned AsmVariant,
58 const char *ExtraCode, raw_ostream &O) override;
59 void EmitInstruction(const MachineInstr *MI) override;
60 };
61 } // end of anonymous namespace
62
63
printOperand(const MachineInstr * MI,int OpNum,raw_ostream & O,const char * Modifier)64 void 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 MO.getMBB()->getSymbol()->print(O, MAI);
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 getSymbol(MO.getGlobal())->print(O, MAI);
96
97 if (Offset)
98 O << ')';
99
100 return;
101 }
102 }
103 }
104
printSrcMemOperand(const MachineInstr * MI,int OpNum,raw_ostream & O)105 void MSP430AsmPrinter::printSrcMemOperand(const MachineInstr *MI, int OpNum,
106 raw_ostream &O) {
107 const MachineOperand &Base = MI->getOperand(OpNum);
108 const MachineOperand &Disp = MI->getOperand(OpNum+1);
109
110 // Print displacement first
111
112 // Imm here is in fact global address - print extra modifier.
113 if (Disp.isImm() && !Base.getReg())
114 O << '&';
115 printOperand(MI, OpNum+1, O, "nohash");
116
117 // Print register base field
118 if (Base.getReg()) {
119 O << '(';
120 printOperand(MI, OpNum, O);
121 O << ')';
122 }
123 }
124
125 /// PrintAsmOperand - Print out an operand for an inline asm expression.
126 ///
PrintAsmOperand(const MachineInstr * MI,unsigned OpNo,unsigned AsmVariant,const char * ExtraCode,raw_ostream & O)127 bool MSP430AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
128 unsigned AsmVariant,
129 const char *ExtraCode, raw_ostream &O) {
130 // Does this asm operand have a single letter operand modifier?
131 if (ExtraCode && ExtraCode[0])
132 return true; // Unknown modifier.
133
134 printOperand(MI, OpNo, O);
135 return false;
136 }
137
PrintAsmMemoryOperand(const MachineInstr * MI,unsigned OpNo,unsigned AsmVariant,const char * ExtraCode,raw_ostream & O)138 bool MSP430AsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
139 unsigned OpNo, unsigned AsmVariant,
140 const char *ExtraCode,
141 raw_ostream &O) {
142 if (ExtraCode && ExtraCode[0]) {
143 return true; // Unknown modifier.
144 }
145 printSrcMemOperand(MI, OpNo, O);
146 return false;
147 }
148
149 //===----------------------------------------------------------------------===//
EmitInstruction(const MachineInstr * MI)150 void MSP430AsmPrinter::EmitInstruction(const MachineInstr *MI) {
151 MSP430MCInstLower MCInstLowering(OutContext, *this);
152
153 MCInst TmpInst;
154 MCInstLowering.Lower(MI, TmpInst);
155 EmitToStreamer(*OutStreamer, TmpInst);
156 }
157
158 // Force static initialization.
LLVMInitializeMSP430AsmPrinter()159 extern "C" void LLVMInitializeMSP430AsmPrinter() {
160 RegisterAsmPrinter<MSP430AsmPrinter> X(TheMSP430Target);
161 }
162