SparcAsmPrinter.cpp revision f5da13367f88f06e3b585dc2263ab6e9ca6c4bf8
1//===-- SparcAsmPrinter.cpp - Sparc LLVM assembly writer ------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file was developed by the LLVM research group and is distributed under 6// the University of Illinois Open Source 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 SPARC assembly language. 12// 13//===----------------------------------------------------------------------===// 14 15#include "Sparc.h" 16#include "SparcInstrInfo.h" 17#include "llvm/Constants.h" 18#include "llvm/DerivedTypes.h" 19#include "llvm/Module.h" 20#include "llvm/CodeGen/AsmPrinter.h" 21#include "llvm/CodeGen/MachineFunctionPass.h" 22#include "llvm/CodeGen/MachineConstantPool.h" 23#include "llvm/CodeGen/MachineInstr.h" 24#include "llvm/Target/TargetAsmInfo.h" 25#include "llvm/Target/TargetData.h" 26#include "llvm/Target/TargetMachine.h" 27#include "llvm/Support/Mangler.h" 28#include "llvm/ADT/Statistic.h" 29#include "llvm/ADT/StringExtras.h" 30#include "llvm/Support/CommandLine.h" 31#include "llvm/Support/MathExtras.h" 32#include <cctype> 33using namespace llvm; 34 35namespace { 36 Statistic EmittedInsts("asm-printer", "Number of machine instrs printed"); 37 38 struct VISIBILITY_HIDDEN SparcAsmPrinter : public AsmPrinter { 39 SparcAsmPrinter(std::ostream &O, TargetMachine &TM, const TargetAsmInfo *T) 40 : AsmPrinter(O, TM, T) { 41 } 42 43 /// We name each basic block in a Function with a unique number, so 44 /// that we can consistently refer to them later. This is cleared 45 /// at the beginning of each call to runOnMachineFunction(). 46 /// 47 typedef std::map<const Value *, unsigned> ValueMapTy; 48 ValueMapTy NumberForBB; 49 50 virtual const char *getPassName() const { 51 return "Sparc Assembly Printer"; 52 } 53 54 void printOperand(const MachineInstr *MI, int opNum); 55 void printMemOperand(const MachineInstr *MI, int opNum, 56 const char *Modifier = 0); 57 void printCCOperand(const MachineInstr *MI, int opNum); 58 59 bool printInstruction(const MachineInstr *MI); // autogenerated. 60 bool runOnMachineFunction(MachineFunction &F); 61 bool doInitialization(Module &M); 62 bool doFinalization(Module &M); 63 }; 64} // end of anonymous namespace 65 66#include "SparcGenAsmWriter.inc" 67 68/// createSparcCodePrinterPass - Returns a pass that prints the SPARC 69/// assembly code for a MachineFunction to the given output stream, 70/// using the given target machine description. This should work 71/// regardless of whether the function is in SSA form. 72/// 73FunctionPass *llvm::createSparcCodePrinterPass(std::ostream &o, 74 TargetMachine &tm) { 75 return new SparcAsmPrinter(o, tm, tm.getTargetAsmInfo()); 76} 77 78/// runOnMachineFunction - This uses the printMachineInstruction() 79/// method to print assembly for each instruction. 80/// 81bool SparcAsmPrinter::runOnMachineFunction(MachineFunction &MF) { 82 SetupMachineFunction(MF); 83 84 // Print out constants referenced by the function 85 EmitConstantPool(MF.getConstantPool()); 86 87 // BBNumber is used here so that a given Printer will never give two 88 // BBs the same name. (If you have a better way, please let me know!) 89 static unsigned BBNumber = 0; 90 91 O << "\n\n"; 92 // What's my mangled name? 93 CurrentFnName = Mang->getValueName(MF.getFunction()); 94 95 // Print out the label for the function. 96 const Function *F = MF.getFunction(); 97 SwitchToTextSection(getSectionForFunction(*F).c_str(), F); 98 EmitAlignment(4, F); 99 O << "\t.globl\t" << CurrentFnName << "\n"; 100 O << "\t.type\t" << CurrentFnName << ", #function\n"; 101 O << CurrentFnName << ":\n"; 102 103 // Number each basic block so that we can consistently refer to them 104 // in PC-relative references. 105 // FIXME: Why not use the MBB numbers? 106 NumberForBB.clear(); 107 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end(); 108 I != E; ++I) { 109 NumberForBB[I->getBasicBlock()] = BBNumber++; 110 } 111 112 // Print out code for the function. 113 for (MachineFunction::const_iterator I = MF.begin(), E = MF.end(); 114 I != E; ++I) { 115 // Print a label for the basic block. 116 if (I != MF.begin()) { 117 printBasicBlockLabel(I, true); 118 O << '\n'; 119 } 120 for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end(); 121 II != E; ++II) { 122 // Print the assembly for the instruction. 123 O << "\t"; 124 printInstruction(II); 125 ++EmittedInsts; 126 } 127 } 128 129 // We didn't modify anything. 130 return false; 131} 132 133void SparcAsmPrinter::printOperand(const MachineInstr *MI, int opNum) { 134 const MachineOperand &MO = MI->getOperand (opNum); 135 const MRegisterInfo &RI = *TM.getRegisterInfo(); 136 bool CloseParen = false; 137 if (MI->getOpcode() == SP::SETHIi && !MO.isRegister() && !MO.isImmediate()) { 138 O << "%hi("; 139 CloseParen = true; 140 } else if ((MI->getOpcode() == SP::ORri || MI->getOpcode() == SP::ADDri) 141 && !MO.isRegister() && !MO.isImmediate()) { 142 O << "%lo("; 143 CloseParen = true; 144 } 145 switch (MO.getType()) { 146 case MachineOperand::MO_Register: 147 if (MRegisterInfo::isPhysicalRegister(MO.getReg())) 148 O << "%" << LowercaseString (RI.get(MO.getReg()).Name); 149 else 150 O << "%reg" << MO.getReg(); 151 break; 152 153 case MachineOperand::MO_Immediate: 154 O << (int)MO.getImmedValue(); 155 break; 156 case MachineOperand::MO_MachineBasicBlock: 157 printBasicBlockLabel(MO.getMachineBasicBlock()); 158 return; 159 case MachineOperand::MO_GlobalAddress: 160 O << Mang->getValueName(MO.getGlobal()); 161 break; 162 case MachineOperand::MO_ExternalSymbol: 163 O << MO.getSymbolName(); 164 break; 165 case MachineOperand::MO_ConstantPoolIndex: 166 O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << "_" 167 << MO.getConstantPoolIndex(); 168 break; 169 default: 170 O << "<unknown operand type>"; abort (); break; 171 } 172 if (CloseParen) O << ")"; 173} 174 175void SparcAsmPrinter::printMemOperand(const MachineInstr *MI, int opNum, 176 const char *Modifier) { 177 printOperand(MI, opNum); 178 179 // If this is an ADD operand, emit it like normal operands. 180 if (Modifier && !strcmp(Modifier, "arith")) { 181 O << ", "; 182 printOperand(MI, opNum+1); 183 return; 184 } 185 186 if (MI->getOperand(opNum+1).isRegister() && 187 MI->getOperand(opNum+1).getReg() == SP::G0) 188 return; // don't print "+%g0" 189 if (MI->getOperand(opNum+1).isImmediate() && 190 MI->getOperand(opNum+1).getImmedValue() == 0) 191 return; // don't print "+0" 192 193 O << "+"; 194 if (MI->getOperand(opNum+1).isGlobalAddress() || 195 MI->getOperand(opNum+1).isConstantPoolIndex()) { 196 O << "%lo("; 197 printOperand(MI, opNum+1); 198 O << ")"; 199 } else { 200 printOperand(MI, opNum+1); 201 } 202} 203 204void SparcAsmPrinter::printCCOperand(const MachineInstr *MI, int opNum) { 205 int CC = (int)MI->getOperand(opNum).getImmedValue(); 206 O << SPARCCondCodeToString((SPCC::CondCodes)CC); 207} 208 209 210 211bool SparcAsmPrinter::doInitialization(Module &M) { 212 Mang = new Mangler(M); 213 return false; // success 214} 215 216bool SparcAsmPrinter::doFinalization(Module &M) { 217 const TargetData *TD = TM.getTargetData(); 218 219 // Print out module-level global variables here. 220 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end(); 221 I != E; ++I) 222 if (I->hasInitializer()) { // External global require no code 223 // Check to see if this is a special global used by LLVM, if so, emit it. 224 if (EmitSpecialLLVMGlobal(I)) 225 continue; 226 227 O << "\n\n"; 228 std::string name = Mang->getValueName(I); 229 Constant *C = I->getInitializer(); 230 unsigned Size = TD->getTypeSize(C->getType()); 231 unsigned Align = TD->getTypeAlignment(C->getType()); 232 233 if (C->isNullValue() && 234 (I->hasLinkOnceLinkage() || I->hasInternalLinkage() || 235 I->hasWeakLinkage() /* FIXME: Verify correct */)) { 236 SwitchToDataSection(".data", I); 237 if (I->hasInternalLinkage()) 238 O << "\t.local " << name << "\n"; 239 240 O << "\t.comm " << name << "," << TD->getTypeSize(C->getType()) 241 << "," << (unsigned)TD->getTypeAlignment(C->getType()); 242 O << "\n"; 243 } else { 244 switch (I->getLinkage()) { 245 case GlobalValue::LinkOnceLinkage: 246 case GlobalValue::WeakLinkage: // FIXME: Verify correct for weak. 247 // Nonnull linkonce -> weak 248 O << "\t.weak " << name << "\n"; 249 SwitchToDataSection("", I); 250 O << "\t.section\t\".llvm.linkonce.d." << name 251 << "\",\"aw\",@progbits\n"; 252 break; 253 254 case GlobalValue::AppendingLinkage: 255 // FIXME: appending linkage variables should go into a section of 256 // their name or something. For now, just emit them as external. 257 case GlobalValue::ExternalLinkage: 258 // If external or appending, declare as a global symbol 259 O << "\t.globl " << name << "\n"; 260 // FALL THROUGH 261 case GlobalValue::InternalLinkage: 262 if (C->isNullValue()) 263 SwitchToDataSection(".bss", I); 264 else 265 SwitchToDataSection(".data", I); 266 break; 267 case GlobalValue::GhostLinkage: 268 cerr << "Should not have any unmaterialized functions!\n"; 269 abort(); 270 case GlobalValue::DLLImportLinkage: 271 cerr << "DLLImport linkage is not supported by this target!\n"; 272 abort(); 273 case GlobalValue::DLLExportLinkage: 274 cerr << "DLLExport linkage is not supported by this target!\n"; 275 abort(); 276 default: 277 assert(0 && "Unknown linkage type!"); 278 } 279 280 O << "\t.align " << Align << "\n"; 281 O << "\t.type " << name << ",#object\n"; 282 O << "\t.size " << name << "," << Size << "\n"; 283 O << name << ":\n"; 284 EmitGlobalConstant(C); 285 } 286 } 287 288 AsmPrinter::doFinalization(M); 289 return false; // success 290} 291