1 //===-- XCoreAsmPrinter.cpp - XCore LLVM assembly writer ------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file contains a printer that converts from our internal representation 10 // of machine-dependent LLVM code to the XAS-format XCore assembly language. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "MCTargetDesc/XCoreInstPrinter.h" 15 #include "TargetInfo/XCoreTargetInfo.h" 16 #include "XCore.h" 17 #include "XCoreInstrInfo.h" 18 #include "XCoreMCInstLower.h" 19 #include "XCoreSubtarget.h" 20 #include "XCoreTargetMachine.h" 21 #include "XCoreTargetStreamer.h" 22 #include "llvm/ADT/SmallString.h" 23 #include "llvm/ADT/StringExtras.h" 24 #include "llvm/CodeGen/AsmPrinter.h" 25 #include "llvm/CodeGen/MachineConstantPool.h" 26 #include "llvm/CodeGen/MachineFunctionPass.h" 27 #include "llvm/CodeGen/MachineInstr.h" 28 #include "llvm/CodeGen/MachineJumpTableInfo.h" 29 #include "llvm/CodeGen/MachineModuleInfo.h" 30 #include "llvm/IR/Constants.h" 31 #include "llvm/IR/DataLayout.h" 32 #include "llvm/IR/DebugInfo.h" 33 #include "llvm/IR/DerivedTypes.h" 34 #include "llvm/IR/Mangler.h" 35 #include "llvm/IR/Module.h" 36 #include "llvm/MC/MCAsmInfo.h" 37 #include "llvm/MC/MCExpr.h" 38 #include "llvm/MC/MCInst.h" 39 #include "llvm/MC/MCStreamer.h" 40 #include "llvm/MC/MCSymbolELF.h" 41 #include "llvm/Support/ErrorHandling.h" 42 #include "llvm/Support/TargetRegistry.h" 43 #include "llvm/Support/raw_ostream.h" 44 #include "llvm/Target/TargetLoweringObjectFile.h" 45 #include <algorithm> 46 #include <cctype> 47 using namespace llvm; 48 49 #define DEBUG_TYPE "asm-printer" 50 51 namespace { 52 class XCoreAsmPrinter : public AsmPrinter { 53 XCoreMCInstLower MCInstLowering; 54 XCoreTargetStreamer &getTargetStreamer(); 55 56 public: 57 explicit XCoreAsmPrinter(TargetMachine &TM, 58 std::unique_ptr<MCStreamer> Streamer) 59 : AsmPrinter(TM, std::move(Streamer)), MCInstLowering(*this) {} 60 61 StringRef getPassName() const override { return "XCore Assembly Printer"; } 62 63 void printInlineJT(const MachineInstr *MI, int opNum, raw_ostream &O, 64 const std::string &directive = ".jmptable"); 65 void printInlineJT32(const MachineInstr *MI, int opNum, raw_ostream &O) { 66 printInlineJT(MI, opNum, O, ".jmptable32"); 67 } 68 void printOperand(const MachineInstr *MI, int opNum, raw_ostream &O); 69 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, 70 const char *ExtraCode, raw_ostream &O) override; 71 bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNum, 72 const char *ExtraCode, raw_ostream &O) override; 73 74 void emitArrayBound(MCSymbol *Sym, const GlobalVariable *GV); 75 void EmitGlobalVariable(const GlobalVariable *GV) override; 76 77 void EmitFunctionEntryLabel() override; 78 void EmitInstruction(const MachineInstr *MI) override; 79 void EmitFunctionBodyStart() override; 80 void EmitFunctionBodyEnd() override; 81 }; 82 } // end of anonymous namespace 83 84 XCoreTargetStreamer &XCoreAsmPrinter::getTargetStreamer() { 85 return static_cast<XCoreTargetStreamer&>(*OutStreamer->getTargetStreamer()); 86 } 87 88 void XCoreAsmPrinter::emitArrayBound(MCSymbol *Sym, const GlobalVariable *GV) { 89 assert( ( GV->hasExternalLinkage() || GV->hasWeakLinkage() || 90 GV->hasLinkOnceLinkage() || GV->hasCommonLinkage() ) && 91 "Unexpected linkage"); 92 if (ArrayType *ATy = dyn_cast<ArrayType>(GV->getValueType())) { 93 94 MCSymbol *SymGlob = OutContext.getOrCreateSymbol( 95 Twine(Sym->getName() + StringRef(".globound"))); 96 OutStreamer->EmitSymbolAttribute(SymGlob, MCSA_Global); 97 OutStreamer->EmitAssignment(SymGlob, 98 MCConstantExpr::create(ATy->getNumElements(), 99 OutContext)); 100 if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage() || 101 GV->hasCommonLinkage()) { 102 OutStreamer->EmitSymbolAttribute(SymGlob, MCSA_Weak); 103 } 104 } 105 } 106 107 void XCoreAsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) { 108 // Check to see if this is a special global used by LLVM, if so, emit it. 109 if (!GV->hasInitializer() || 110 EmitSpecialLLVMGlobal(GV)) 111 return; 112 113 const DataLayout &DL = getDataLayout(); 114 OutStreamer->SwitchSection(getObjFileLowering().SectionForGlobal(GV, TM)); 115 116 MCSymbol *GVSym = getSymbol(GV); 117 const Constant *C = GV->getInitializer(); 118 const Align Alignment(DL.getPrefTypeAlignment(C->getType())); 119 120 // Mark the start of the global 121 getTargetStreamer().emitCCTopData(GVSym->getName()); 122 123 switch (GV->getLinkage()) { 124 case GlobalValue::AppendingLinkage: 125 report_fatal_error("AppendingLinkage is not supported by this target!"); 126 case GlobalValue::LinkOnceAnyLinkage: 127 case GlobalValue::LinkOnceODRLinkage: 128 case GlobalValue::WeakAnyLinkage: 129 case GlobalValue::WeakODRLinkage: 130 case GlobalValue::ExternalLinkage: 131 case GlobalValue::CommonLinkage: 132 emitArrayBound(GVSym, GV); 133 OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Global); 134 135 if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage() || 136 GV->hasCommonLinkage()) 137 OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Weak); 138 LLVM_FALLTHROUGH; 139 case GlobalValue::InternalLinkage: 140 case GlobalValue::PrivateLinkage: 141 break; 142 default: 143 llvm_unreachable("Unknown linkage type!"); 144 } 145 146 EmitAlignment(std::max(Alignment, Align(4)), GV); 147 148 if (GV->isThreadLocal()) { 149 report_fatal_error("TLS is not supported by this target!"); 150 } 151 unsigned Size = DL.getTypeAllocSize(C->getType()); 152 if (MAI->hasDotTypeDotSizeDirective()) { 153 OutStreamer->EmitSymbolAttribute(GVSym, MCSA_ELF_TypeObject); 154 OutStreamer->emitELFSize(GVSym, MCConstantExpr::create(Size, OutContext)); 155 } 156 OutStreamer->EmitLabel(GVSym); 157 158 EmitGlobalConstant(DL, C); 159 // The ABI requires that unsigned scalar types smaller than 32 bits 160 // are padded to 32 bits. 161 if (Size < 4) 162 OutStreamer->EmitZeros(4 - Size); 163 164 // Mark the end of the global 165 getTargetStreamer().emitCCBottomData(GVSym->getName()); 166 } 167 168 void XCoreAsmPrinter::EmitFunctionBodyStart() { 169 MCInstLowering.Initialize(&MF->getContext()); 170 } 171 172 /// EmitFunctionBodyEnd - Targets can override this to emit stuff after 173 /// the last basic block in the function. 174 void XCoreAsmPrinter::EmitFunctionBodyEnd() { 175 // Emit function end directives 176 getTargetStreamer().emitCCBottomFunction(CurrentFnSym->getName()); 177 } 178 179 void XCoreAsmPrinter::EmitFunctionEntryLabel() { 180 // Mark the start of the function 181 getTargetStreamer().emitCCTopFunction(CurrentFnSym->getName()); 182 OutStreamer->EmitLabel(CurrentFnSym); 183 } 184 185 void XCoreAsmPrinter:: 186 printInlineJT(const MachineInstr *MI, int opNum, raw_ostream &O, 187 const std::string &directive) { 188 unsigned JTI = MI->getOperand(opNum).getIndex(); 189 const MachineFunction *MF = MI->getParent()->getParent(); 190 const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo(); 191 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables(); 192 const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs; 193 O << "\t" << directive << " "; 194 for (unsigned i = 0, e = JTBBs.size(); i != e; ++i) { 195 MachineBasicBlock *MBB = JTBBs[i]; 196 if (i > 0) 197 O << ","; 198 MBB->getSymbol()->print(O, MAI); 199 } 200 } 201 202 void XCoreAsmPrinter::printOperand(const MachineInstr *MI, int opNum, 203 raw_ostream &O) { 204 const DataLayout &DL = getDataLayout(); 205 const MachineOperand &MO = MI->getOperand(opNum); 206 switch (MO.getType()) { 207 case MachineOperand::MO_Register: 208 O << XCoreInstPrinter::getRegisterName(MO.getReg()); 209 break; 210 case MachineOperand::MO_Immediate: 211 O << MO.getImm(); 212 break; 213 case MachineOperand::MO_MachineBasicBlock: 214 MO.getMBB()->getSymbol()->print(O, MAI); 215 break; 216 case MachineOperand::MO_GlobalAddress: 217 PrintSymbolOperand(MO, O); 218 break; 219 case MachineOperand::MO_ConstantPoolIndex: 220 O << DL.getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_' 221 << MO.getIndex(); 222 break; 223 case MachineOperand::MO_BlockAddress: 224 GetBlockAddressSymbol(MO.getBlockAddress())->print(O, MAI); 225 break; 226 default: 227 llvm_unreachable("not implemented"); 228 } 229 } 230 231 /// PrintAsmOperand - Print out an operand for an inline asm expression. 232 /// 233 bool XCoreAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, 234 const char *ExtraCode, raw_ostream &O) { 235 // Print the operand if there is no operand modifier. 236 if (!ExtraCode || !ExtraCode[0]) { 237 printOperand(MI, OpNo, O); 238 return false; 239 } 240 241 // Otherwise fallback on the default implementation. 242 return AsmPrinter::PrintAsmOperand(MI, OpNo, ExtraCode, O); 243 } 244 245 bool XCoreAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI, 246 unsigned OpNum, 247 const char *ExtraCode, 248 raw_ostream &O) { 249 if (ExtraCode && ExtraCode[0]) { 250 return true; // Unknown modifier. 251 } 252 printOperand(MI, OpNum, O); 253 O << '['; 254 printOperand(MI, OpNum + 1, O); 255 O << ']'; 256 return false; 257 } 258 259 void XCoreAsmPrinter::EmitInstruction(const MachineInstr *MI) { 260 SmallString<128> Str; 261 raw_svector_ostream O(Str); 262 263 switch (MI->getOpcode()) { 264 case XCore::DBG_VALUE: 265 llvm_unreachable("Should be handled target independently"); 266 case XCore::ADD_2rus: 267 if (MI->getOperand(2).getImm() == 0) { 268 O << "\tmov " 269 << XCoreInstPrinter::getRegisterName(MI->getOperand(0).getReg()) << ", " 270 << XCoreInstPrinter::getRegisterName(MI->getOperand(1).getReg()); 271 OutStreamer->EmitRawText(O.str()); 272 return; 273 } 274 break; 275 case XCore::BR_JT: 276 case XCore::BR_JT32: 277 O << "\tbru " 278 << XCoreInstPrinter::getRegisterName(MI->getOperand(1).getReg()) << '\n'; 279 if (MI->getOpcode() == XCore::BR_JT) 280 printInlineJT(MI, 0, O); 281 else 282 printInlineJT32(MI, 0, O); 283 O << '\n'; 284 OutStreamer->EmitRawText(O.str()); 285 return; 286 } 287 288 MCInst TmpInst; 289 MCInstLowering.Lower(MI, TmpInst); 290 291 EmitToStreamer(*OutStreamer, TmpInst); 292 } 293 294 // Force static initialization. 295 extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeXCoreAsmPrinter() { 296 RegisterAsmPrinter<XCoreAsmPrinter> X(getTheXCoreTarget()); 297 } 298