1 //===-- AlphaAsmPrinter.cpp - Alpha 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 GAS-format Alpha assembly language.
12 //
13 //===----------------------------------------------------------------------===//
14
15 #define DEBUG_TYPE "asm-printer"
16 #include "Alpha.h"
17 #include "AlphaInstrInfo.h"
18 #include "AlphaTargetMachine.h"
19 #include "llvm/Module.h"
20 #include "llvm/Type.h"
21 #include "llvm/Assembly/Writer.h"
22 #include "llvm/CodeGen/AsmPrinter.h"
23 #include "llvm/MC/MCStreamer.h"
24 #include "llvm/MC/MCAsmInfo.h"
25 #include "llvm/MC/MCSymbol.h"
26 #include "llvm/Target/Mangler.h"
27 #include "llvm/Target/TargetLoweringObjectFile.h"
28 #include "llvm/Target/TargetMachine.h"
29 #include "llvm/ADT/SmallString.h"
30 #include "llvm/Support/TargetRegistry.h"
31 #include "llvm/Support/raw_ostream.h"
32 using namespace llvm;
33
34 namespace {
35 struct AlphaAsmPrinter : public AsmPrinter {
36 /// Unique incrementer for label values for referencing Global values.
37 ///
38
AlphaAsmPrinter__anon9593161d0111::AlphaAsmPrinter39 explicit AlphaAsmPrinter(TargetMachine &tm, MCStreamer &Streamer)
40 : AsmPrinter(tm, Streamer) {}
41
getPassName__anon9593161d0111::AlphaAsmPrinter42 virtual const char *getPassName() const {
43 return "Alpha Assembly Printer";
44 }
45 void printInstruction(const MachineInstr *MI, raw_ostream &O);
EmitInstruction__anon9593161d0111::AlphaAsmPrinter46 void EmitInstruction(const MachineInstr *MI) {
47 SmallString<128> Str;
48 raw_svector_ostream OS(Str);
49 printInstruction(MI, OS);
50 OutStreamer.EmitRawText(OS.str());
51 }
52 static const char *getRegisterName(unsigned RegNo);
53
54 void printOp(const MachineOperand &MO, raw_ostream &O);
55 void printOperand(const MachineInstr *MI, int opNum, raw_ostream &O);
56 virtual void EmitFunctionBodyStart();
57 virtual void EmitFunctionBodyEnd();
58 void EmitStartOfAsmFile(Module &M);
59
60 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
61 unsigned AsmVariant, const char *ExtraCode,
62 raw_ostream &O);
63 bool PrintAsmMemoryOperand(const MachineInstr *MI,
64 unsigned OpNo, unsigned AsmVariant,
65 const char *ExtraCode, raw_ostream &O);
66 };
67 } // end of anonymous namespace
68
69 #include "AlphaGenAsmWriter.inc"
70
printOperand(const MachineInstr * MI,int opNum,raw_ostream & O)71 void AlphaAsmPrinter::printOperand(const MachineInstr *MI, int opNum,
72 raw_ostream &O) {
73 const MachineOperand &MO = MI->getOperand(opNum);
74 if (MO.isReg()) {
75 assert(TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
76 "Not physreg??");
77 O << getRegisterName(MO.getReg());
78 } else if (MO.isImm()) {
79 O << MO.getImm();
80 assert(MO.getImm() < (1 << 30));
81 } else {
82 printOp(MO, O);
83 }
84 }
85
86
printOp(const MachineOperand & MO,raw_ostream & O)87 void AlphaAsmPrinter::printOp(const MachineOperand &MO, raw_ostream &O) {
88 switch (MO.getType()) {
89 case MachineOperand::MO_Register:
90 O << getRegisterName(MO.getReg());
91 return;
92
93 case MachineOperand::MO_Immediate:
94 assert(0 && "printOp() does not handle immediate values");
95 return;
96
97 case MachineOperand::MO_MachineBasicBlock:
98 O << *MO.getMBB()->getSymbol();
99 return;
100
101 case MachineOperand::MO_ConstantPoolIndex:
102 O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << "_"
103 << MO.getIndex();
104 return;
105
106 case MachineOperand::MO_ExternalSymbol:
107 O << MO.getSymbolName();
108 return;
109
110 case MachineOperand::MO_GlobalAddress:
111 O << *Mang->getSymbol(MO.getGlobal());
112 return;
113
114 case MachineOperand::MO_JumpTableIndex:
115 O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
116 << '_' << MO.getIndex();
117 return;
118
119 default:
120 O << "<unknown operand type: " << MO.getType() << ">";
121 return;
122 }
123 }
124
125 /// EmitFunctionBodyStart - Targets can override this to emit stuff before
126 /// the first basic block in the function.
EmitFunctionBodyStart()127 void AlphaAsmPrinter::EmitFunctionBodyStart() {
128 OutStreamer.EmitRawText("\t.ent " + Twine(CurrentFnSym->getName()));
129 }
130
131 /// EmitFunctionBodyEnd - Targets can override this to emit stuff after
132 /// the last basic block in the function.
EmitFunctionBodyEnd()133 void AlphaAsmPrinter::EmitFunctionBodyEnd() {
134 OutStreamer.EmitRawText("\t.end " + Twine(CurrentFnSym->getName()));
135 }
136
EmitStartOfAsmFile(Module & M)137 void AlphaAsmPrinter::EmitStartOfAsmFile(Module &M) {
138 OutStreamer.EmitRawText(StringRef("\t.arch ev6"));
139 OutStreamer.EmitRawText(StringRef("\t.set noat"));
140 }
141
142 /// PrintAsmOperand - Print out an operand for an inline asm expression.
143 ///
PrintAsmOperand(const MachineInstr * MI,unsigned OpNo,unsigned AsmVariant,const char * ExtraCode,raw_ostream & O)144 bool AlphaAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
145 unsigned AsmVariant,
146 const char *ExtraCode, raw_ostream &O) {
147 printOperand(MI, OpNo, O);
148 return false;
149 }
150
PrintAsmMemoryOperand(const MachineInstr * MI,unsigned OpNo,unsigned AsmVariant,const char * ExtraCode,raw_ostream & O)151 bool AlphaAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
152 unsigned OpNo, unsigned AsmVariant,
153 const char *ExtraCode,
154 raw_ostream &O) {
155 if (ExtraCode && ExtraCode[0])
156 return true; // Unknown modifier.
157 O << "0(";
158 printOperand(MI, OpNo, O);
159 O << ")";
160 return false;
161 }
162
163 // Force static initialization.
LLVMInitializeAlphaAsmPrinter()164 extern "C" void LLVMInitializeAlphaAsmPrinter() {
165 RegisterAsmPrinter<AlphaAsmPrinter> X(TheAlphaTarget);
166 }
167