1 //===-- MSP430AsmPrinter.cpp - MSP430 LLVM assembly writer ----------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains a printer that converts from our internal representation
11 // of machine-dependent LLVM code to the MSP430 assembly language.
13 //===----------------------------------------------------------------------===//
15 #define DEBUG_TYPE "asm-printer"
17 #include "MSP430InstrInfo.h"
18 #include "MSP430MCAsmInfo.h"
19 #include "MSP430TargetMachine.h"
20 #include "llvm/Constants.h"
21 #include "llvm/DerivedTypes.h"
22 #include "llvm/Module.h"
23 #include "llvm/CodeGen/AsmPrinter.h"
24 #include "llvm/CodeGen/DwarfWriter.h"
25 #include "llvm/CodeGen/MachineModuleInfo.h"
26 #include "llvm/CodeGen/MachineFunctionPass.h"
27 #include "llvm/CodeGen/MachineConstantPool.h"
28 #include "llvm/CodeGen/MachineInstr.h"
29 #include "llvm/MC/MCStreamer.h"
30 #include "llvm/MC/MCSymbol.h"
31 #include "llvm/Target/TargetData.h"
32 #include "llvm/Target/TargetLoweringObjectFile.h"
33 #include "llvm/Target/TargetRegistry.h"
34 #include "llvm/ADT/Statistic.h"
35 #include "llvm/Support/Compiler.h"
36 #include "llvm/Support/FormattedStream.h"
37 #include "llvm/Support/Mangler.h"
38 #include "llvm/Support/ErrorHandling.h"
42 STATISTIC(EmittedInsts, "Number of machine instrs printed");
45 class VISIBILITY_HIDDEN MSP430AsmPrinter : public AsmPrinter {
47 MSP430AsmPrinter(formatted_raw_ostream &O, TargetMachine &TM,
48 const MCAsmInfo *MAI, bool V)
49 : AsmPrinter(O, TM, MAI, V) {}
51 virtual const char *getPassName() const {
52 return "MSP430 Assembly Printer";
55 void printOperand(const MachineInstr *MI, int OpNum,
56 const char* Modifier = 0);
57 void printSrcMemOperand(const MachineInstr *MI, int OpNum,
58 const char* Modifier = 0);
59 void printCCOperand(const MachineInstr *MI, int OpNum);
60 void printInstruction(const MachineInstr *MI); // autogenerated.
61 static const char *getRegisterName(unsigned RegNo);
63 void printMachineInstruction(const MachineInstr * MI);
64 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
66 const char *ExtraCode);
68 void emitFunctionHeader(const MachineFunction &MF);
69 bool runOnMachineFunction(MachineFunction &F);
71 virtual void PrintGlobalVariable(const GlobalVariable *GV) {
72 // FIXME: No support for global variables?
75 void getAnalysisUsage(AnalysisUsage &AU) const {
76 AsmPrinter::getAnalysisUsage(AU);
80 } // end of anonymous namespace
82 #include "MSP430GenAsmWriter.inc"
85 void MSP430AsmPrinter::emitFunctionHeader(const MachineFunction &MF) {
86 const Function *F = MF.getFunction();
88 OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
90 unsigned FnAlign = MF.getAlignment();
91 EmitAlignment(FnAlign, F);
93 switch (F->getLinkage()) {
94 default: llvm_unreachable("Unknown linkage type!");
95 case Function::InternalLinkage: // Symbols default to internal.
96 case Function::PrivateLinkage:
97 case Function::LinkerPrivateLinkage:
99 case Function::ExternalLinkage:
100 O << "\t.globl\t" << CurrentFnName << '\n';
102 case Function::LinkOnceAnyLinkage:
103 case Function::LinkOnceODRLinkage:
104 case Function::WeakAnyLinkage:
105 case Function::WeakODRLinkage:
106 O << "\t.weak\t" << CurrentFnName << '\n';
110 printVisibility(CurrentFnName, F->getVisibility());
112 O << "\t.type\t" << CurrentFnName << ",@function\n"
113 << CurrentFnName << ":\n";
116 bool MSP430AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
117 SetupMachineFunction(MF);
120 // Print the 'header' of function
121 emitFunctionHeader(MF);
123 // Print out code for the function.
124 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
126 // Print a label for the basic block.
127 if (!VerboseAsm && (I->pred_empty() || I->isOnlyReachableByFallthrough())) {
128 // This is an entry block or a block that's only reachable via a
129 // fallthrough edge. In non-VerboseAsm mode, don't print the label.
131 EmitBasicBlockStart(I);
135 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
137 // Print the assembly for the instruction.
138 printMachineInstruction(II);
141 if (MAI->hasDotTypeDotSizeDirective())
142 O << "\t.size\t" << CurrentFnName << ", .-" << CurrentFnName << '\n';
144 // We didn't modify anything
148 void MSP430AsmPrinter::printMachineInstruction(const MachineInstr *MI) {
151 processDebugLoc(MI->getDebugLoc());
153 // Call the autogenerated instruction printer routines.
154 printInstruction(MI);
156 if (VerboseAsm && !MI->getDebugLoc().isUnknown())
161 void MSP430AsmPrinter::printOperand(const MachineInstr *MI, int OpNum,
162 const char* Modifier) {
163 const MachineOperand &MO = MI->getOperand(OpNum);
164 switch (MO.getType()) {
165 case MachineOperand::MO_Register:
166 assert (TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
167 "Virtual registers should be already mapped!");
168 O << TM.getRegisterInfo()->get(MO.getReg()).AsmName;
170 case MachineOperand::MO_Immediate:
171 if (!Modifier || strcmp(Modifier, "nohash"))
175 case MachineOperand::MO_MachineBasicBlock:
176 GetMBBSymbol(MO.getMBB()->getNumber())->print(O, MAI);
178 case MachineOperand::MO_GlobalAddress: {
179 bool isMemOp = Modifier && !strcmp(Modifier, "mem");
180 bool isCallOp = Modifier && !strcmp(Modifier, "call");
181 std::string Name = Mang->getMangledName(MO.getGlobal());
182 assert(MO.getOffset() == 0 && "No offsets allowed!");
193 case MachineOperand::MO_ExternalSymbol: {
194 bool isCallOp = Modifier && !strcmp(Modifier, "call");
195 std::string Name(MAI->getGlobalPrefix());
196 Name += MO.getSymbolName();
203 llvm_unreachable("Not implemented yet!");
207 void MSP430AsmPrinter::printSrcMemOperand(const MachineInstr *MI, int OpNum,
208 const char* Modifier) {
209 const MachineOperand &Base = MI->getOperand(OpNum);
210 const MachineOperand &Disp = MI->getOperand(OpNum+1);
213 printOperand(MI, OpNum, "mem");
214 else if (Disp.isImm() && !Base.getReg())
215 printOperand(MI, OpNum);
216 else if (Base.getReg()) {
218 printOperand(MI, OpNum + 1, "nohash");
220 printOperand(MI, OpNum);
224 printOperand(MI, OpNum);
227 llvm_unreachable("Unsupported memory operand");
230 void MSP430AsmPrinter::printCCOperand(const MachineInstr *MI, int OpNum) {
231 unsigned CC = MI->getOperand(OpNum).getImm();
235 llvm_unreachable("Unsupported CC code");
240 case MSP430::COND_NE:
243 case MSP430::COND_HS:
246 case MSP430::COND_LO:
249 case MSP430::COND_GE:
258 /// PrintAsmOperand - Print out an operand for an inline asm expression.
260 bool MSP430AsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
262 const char *ExtraCode) {
263 // Does this asm operand have a single letter operand modifier?
264 if (ExtraCode && ExtraCode[0])
265 return true; // Unknown modifier.
267 printOperand(MI, OpNo);
271 // Force static initialization.
272 extern "C" void LLVMInitializeMSP430AsmPrinter() {
273 RegisterAsmPrinter<MSP430AsmPrinter> X(TheMSP430Target);