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1 //===-- BlackfinAsmPrinter.cpp - Blackfin 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 BLACKFIN assembly language.
12 //
13 //===----------------------------------------------------------------------===//
14 
15 #define DEBUG_TYPE "asm-printer"
16 #include "Blackfin.h"
17 #include "BlackfinInstrInfo.h"
18 #include "llvm/Constants.h"
19 #include "llvm/DerivedTypes.h"
20 #include "llvm/Module.h"
21 #include "llvm/CodeGen/AsmPrinter.h"
22 #include "llvm/CodeGen/MachineFunctionPass.h"
23 #include "llvm/CodeGen/MachineConstantPool.h"
24 #include "llvm/CodeGen/MachineInstr.h"
25 #include "llvm/MC/MCStreamer.h"
26 #include "llvm/MC/MCAsmInfo.h"
27 #include "llvm/MC/MCContext.h"
28 #include "llvm/MC/MCSymbol.h"
29 #include "llvm/Target/Mangler.h"
30 #include "llvm/Target/TargetData.h"
31 #include "llvm/Target/TargetLoweringObjectFile.h"
32 #include "llvm/ADT/SmallString.h"
33 #include "llvm/Support/ErrorHandling.h"
34 #include "llvm/Support/TargetRegistry.h"
35 #include "llvm/Support/raw_ostream.h"
36 using namespace llvm;
37 
38 namespace {
39   class BlackfinAsmPrinter : public AsmPrinter {
40   public:
BlackfinAsmPrinter(TargetMachine & TM,MCStreamer & Streamer)41     BlackfinAsmPrinter(TargetMachine &TM, MCStreamer &Streamer)
42       : AsmPrinter(TM, Streamer) {}
43 
getPassName() const44     virtual const char *getPassName() const {
45       return "Blackfin Assembly Printer";
46     }
47 
48     void printOperand(const MachineInstr *MI, int opNum, raw_ostream &O);
49     void printMemoryOperand(const MachineInstr *MI, int opNum, raw_ostream &O);
50     void printInstruction(const MachineInstr *MI, raw_ostream &O);// autogen'd.
51     static const char *getRegisterName(unsigned RegNo);
52 
EmitInstruction(const MachineInstr * MI)53     void EmitInstruction(const MachineInstr *MI) {
54       SmallString<128> Str;
55       raw_svector_ostream OS(Str);
56       printInstruction(MI, OS);
57       OutStreamer.EmitRawText(OS.str());
58     }
59     bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
60                          unsigned AsmVariant, const char *ExtraCode,
61                          raw_ostream &O);
62     bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
63                                unsigned AsmVariant, const char *ExtraCode,
64                                raw_ostream &O);
65   };
66 } // end of anonymous namespace
67 
68 #include "BlackfinGenAsmWriter.inc"
69 
LLVMInitializeBlackfinAsmPrinter()70 extern "C" void LLVMInitializeBlackfinAsmPrinter() {
71   RegisterAsmPrinter<BlackfinAsmPrinter> X(TheBlackfinTarget);
72 }
73 
printOperand(const MachineInstr * MI,int opNum,raw_ostream & O)74 void BlackfinAsmPrinter::printOperand(const MachineInstr *MI, int opNum,
75                                       raw_ostream &O) {
76   const MachineOperand &MO = MI->getOperand(opNum);
77   switch (MO.getType()) {
78   case MachineOperand::MO_Register:
79     assert(TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
80            "Virtual registers should be already mapped!");
81     O << getRegisterName(MO.getReg());
82     break;
83 
84   case MachineOperand::MO_Immediate:
85     O << MO.getImm();
86     break;
87   case MachineOperand::MO_MachineBasicBlock:
88     O << *MO.getMBB()->getSymbol();
89     return;
90   case MachineOperand::MO_GlobalAddress:
91     O << *Mang->getSymbol(MO.getGlobal());
92     printOffset(MO.getOffset(), O);
93     break;
94   case MachineOperand::MO_ExternalSymbol:
95     O << *GetExternalSymbolSymbol(MO.getSymbolName());
96     break;
97   case MachineOperand::MO_ConstantPoolIndex:
98     O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << "_"
99       << MO.getIndex();
100     break;
101   case MachineOperand::MO_JumpTableIndex:
102     O << MAI->getPrivateGlobalPrefix() << "JTI" << getFunctionNumber()
103       << '_' << MO.getIndex();
104     break;
105   default:
106     llvm_unreachable("<unknown operand type>");
107     break;
108   }
109 }
110 
printMemoryOperand(const MachineInstr * MI,int opNum,raw_ostream & O)111 void BlackfinAsmPrinter::printMemoryOperand(const MachineInstr *MI, int opNum,
112                                             raw_ostream &O) {
113   printOperand(MI, opNum, O);
114 
115   if (MI->getOperand(opNum+1).isImm() && MI->getOperand(opNum+1).getImm() == 0)
116     return;
117 
118   O << " + ";
119   printOperand(MI, opNum+1, O);
120 }
121 
122 /// PrintAsmOperand - Print out an operand for an inline asm expression.
123 ///
PrintAsmOperand(const MachineInstr * MI,unsigned OpNo,unsigned AsmVariant,const char * ExtraCode,raw_ostream & O)124 bool BlackfinAsmPrinter::PrintAsmOperand(const MachineInstr *MI,
125                                          unsigned OpNo, unsigned AsmVariant,
126                                          const char *ExtraCode,
127                                          raw_ostream &O) {
128   if (ExtraCode && ExtraCode[0]) {
129     if (ExtraCode[1] != 0) return true; // Unknown modifier.
130 
131     switch (ExtraCode[0]) {
132     default: return true;  // Unknown modifier.
133     case 'r':
134       break;
135     }
136   }
137 
138   printOperand(MI, OpNo, O);
139 
140   return false;
141 }
142 
PrintAsmMemoryOperand(const MachineInstr * MI,unsigned OpNo,unsigned AsmVariant,const char * ExtraCode,raw_ostream & O)143 bool BlackfinAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
144                                                unsigned OpNo,
145                                                unsigned AsmVariant,
146                                                const char *ExtraCode,
147                                                raw_ostream &O) {
148   if (ExtraCode && ExtraCode[0])
149     return true;  // Unknown modifier
150 
151   O << '[';
152   printOperand(MI, OpNo, O);
153   O << ']';
154 
155   return false;
156 }
157