1//===-- XCoreAsmPrinter.cpp - XCore 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 the XAS-format XCore assembly language. 12// 13//===----------------------------------------------------------------------===// 14 15#include "XCore.h" 16#include "InstPrinter/XCoreInstPrinter.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> 47using namespace llvm; 48 49#define DEBUG_TYPE "asm-printer" 50 51namespace { 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 const char *getPassName() const override { 62 return "XCore Assembly Printer"; 63 } 64 65 void printInlineJT(const MachineInstr *MI, int opNum, raw_ostream &O, 66 const std::string &directive = ".jmptable"); 67 void printInlineJT32(const MachineInstr *MI, int opNum, raw_ostream &O) { 68 printInlineJT(MI, opNum, O, ".jmptable32"); 69 } 70 void printOperand(const MachineInstr *MI, int opNum, raw_ostream &O); 71 bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, 72 unsigned AsmVariant, const char *ExtraCode, 73 raw_ostream &O) override; 74 bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNum, 75 unsigned AsmVariant, const char *ExtraCode, 76 raw_ostream &O) override; 77 78 void emitArrayBound(MCSymbol *Sym, const GlobalVariable *GV); 79 void EmitGlobalVariable(const GlobalVariable *GV) override; 80 81 void EmitFunctionEntryLabel() override; 82 void EmitInstruction(const MachineInstr *MI) override; 83 void EmitFunctionBodyStart() override; 84 void EmitFunctionBodyEnd() override; 85 }; 86} // end of anonymous namespace 87 88XCoreTargetStreamer &XCoreAsmPrinter::getTargetStreamer() { 89 return static_cast<XCoreTargetStreamer&>(*OutStreamer->getTargetStreamer()); 90} 91 92void XCoreAsmPrinter::emitArrayBound(MCSymbol *Sym, const GlobalVariable *GV) { 93 assert( ( GV->hasExternalLinkage() || GV->hasWeakLinkage() || 94 GV->hasLinkOnceLinkage() || GV->hasCommonLinkage() ) && 95 "Unexpected linkage"); 96 if (ArrayType *ATy = dyn_cast<ArrayType>( 97 cast<PointerType>(GV->getType())->getElementType())) { 98 99 MCSymbol *SymGlob = OutContext.getOrCreateSymbol( 100 Twine(Sym->getName() + StringRef(".globound"))); 101 OutStreamer->EmitSymbolAttribute(SymGlob, MCSA_Global); 102 OutStreamer->EmitAssignment(SymGlob, 103 MCConstantExpr::create(ATy->getNumElements(), 104 OutContext)); 105 if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage() || 106 GV->hasCommonLinkage()) { 107 OutStreamer->EmitSymbolAttribute(SymGlob, MCSA_Weak); 108 } 109 } 110} 111 112void XCoreAsmPrinter::EmitGlobalVariable(const GlobalVariable *GV) { 113 // Check to see if this is a special global used by LLVM, if so, emit it. 114 if (!GV->hasInitializer() || 115 EmitSpecialLLVMGlobal(GV)) 116 return; 117 118 const DataLayout &DL = getDataLayout(); 119 OutStreamer->SwitchSection( 120 getObjFileLowering().SectionForGlobal(GV, *Mang, TM)); 121 122 MCSymbol *GVSym = getSymbol(GV); 123 const Constant *C = GV->getInitializer(); 124 unsigned Align = (unsigned)DL.getPreferredTypeAlignmentShift(C->getType()); 125 126 // Mark the start of the global 127 getTargetStreamer().emitCCTopData(GVSym->getName()); 128 129 switch (GV->getLinkage()) { 130 case GlobalValue::AppendingLinkage: 131 report_fatal_error("AppendingLinkage is not supported by this target!"); 132 case GlobalValue::LinkOnceAnyLinkage: 133 case GlobalValue::LinkOnceODRLinkage: 134 case GlobalValue::WeakAnyLinkage: 135 case GlobalValue::WeakODRLinkage: 136 case GlobalValue::ExternalLinkage: 137 case GlobalValue::CommonLinkage: 138 emitArrayBound(GVSym, GV); 139 OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Global); 140 141 if (GV->hasWeakLinkage() || GV->hasLinkOnceLinkage() || 142 GV->hasCommonLinkage()) 143 OutStreamer->EmitSymbolAttribute(GVSym, MCSA_Weak); 144 // FALL THROUGH 145 case GlobalValue::InternalLinkage: 146 case GlobalValue::PrivateLinkage: 147 break; 148 default: 149 llvm_unreachable("Unknown linkage type!"); 150 } 151 152 EmitAlignment(Align > 2 ? Align : 2, GV); 153 154 if (GV->isThreadLocal()) { 155 report_fatal_error("TLS is not supported by this target!"); 156 } 157 unsigned Size = DL.getTypeAllocSize(C->getType()); 158 if (MAI->hasDotTypeDotSizeDirective()) { 159 OutStreamer->EmitSymbolAttribute(GVSym, MCSA_ELF_TypeObject); 160 OutStreamer->emitELFSize(cast<MCSymbolELF>(GVSym), 161 MCConstantExpr::create(Size, OutContext)); 162 } 163 OutStreamer->EmitLabel(GVSym); 164 165 EmitGlobalConstant(DL, C); 166 // The ABI requires that unsigned scalar types smaller than 32 bits 167 // are padded to 32 bits. 168 if (Size < 4) 169 OutStreamer->EmitZeros(4 - Size); 170 171 // Mark the end of the global 172 getTargetStreamer().emitCCBottomData(GVSym->getName()); 173} 174 175void XCoreAsmPrinter::EmitFunctionBodyStart() { 176 MCInstLowering.Initialize(Mang, &MF->getContext()); 177} 178 179/// EmitFunctionBodyEnd - Targets can override this to emit stuff after 180/// the last basic block in the function. 181void XCoreAsmPrinter::EmitFunctionBodyEnd() { 182 // Emit function end directives 183 getTargetStreamer().emitCCBottomFunction(CurrentFnSym->getName()); 184} 185 186void XCoreAsmPrinter::EmitFunctionEntryLabel() { 187 // Mark the start of the function 188 getTargetStreamer().emitCCTopFunction(CurrentFnSym->getName()); 189 OutStreamer->EmitLabel(CurrentFnSym); 190} 191 192void XCoreAsmPrinter:: 193printInlineJT(const MachineInstr *MI, int opNum, raw_ostream &O, 194 const std::string &directive) { 195 unsigned JTI = MI->getOperand(opNum).getIndex(); 196 const MachineFunction *MF = MI->getParent()->getParent(); 197 const MachineJumpTableInfo *MJTI = MF->getJumpTableInfo(); 198 const std::vector<MachineJumpTableEntry> &JT = MJTI->getJumpTables(); 199 const std::vector<MachineBasicBlock*> &JTBBs = JT[JTI].MBBs; 200 O << "\t" << directive << " "; 201 for (unsigned i = 0, e = JTBBs.size(); i != e; ++i) { 202 MachineBasicBlock *MBB = JTBBs[i]; 203 if (i > 0) 204 O << ","; 205 MBB->getSymbol()->print(O, MAI); 206 } 207} 208 209void XCoreAsmPrinter::printOperand(const MachineInstr *MI, int opNum, 210 raw_ostream &O) { 211 const DataLayout &DL = getDataLayout(); 212 const MachineOperand &MO = MI->getOperand(opNum); 213 switch (MO.getType()) { 214 case MachineOperand::MO_Register: 215 O << XCoreInstPrinter::getRegisterName(MO.getReg()); 216 break; 217 case MachineOperand::MO_Immediate: 218 O << MO.getImm(); 219 break; 220 case MachineOperand::MO_MachineBasicBlock: 221 MO.getMBB()->getSymbol()->print(O, MAI); 222 break; 223 case MachineOperand::MO_GlobalAddress: 224 getSymbol(MO.getGlobal())->print(O, MAI); 225 break; 226 case MachineOperand::MO_ConstantPoolIndex: 227 O << DL.getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << '_' 228 << MO.getIndex(); 229 break; 230 case MachineOperand::MO_BlockAddress: 231 GetBlockAddressSymbol(MO.getBlockAddress())->print(O, MAI); 232 break; 233 default: 234 llvm_unreachable("not implemented"); 235 } 236} 237 238/// PrintAsmOperand - Print out an operand for an inline asm expression. 239/// 240bool XCoreAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, 241 unsigned AsmVariant,const char *ExtraCode, 242 raw_ostream &O) { 243 // Print the operand if there is no operand modifier. 244 if (!ExtraCode || !ExtraCode[0]) { 245 printOperand(MI, OpNo, O); 246 return false; 247 } 248 249 // Otherwise fallback on the default implementation. 250 return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, O); 251} 252 253bool XCoreAsmPrinter:: 254PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNum, 255 unsigned AsmVariant, const char *ExtraCode, 256 raw_ostream &O) { 257 if (ExtraCode && ExtraCode[0]) { 258 return true; // Unknown modifier. 259 } 260 printOperand(MI, OpNum, O); 261 O << '['; 262 printOperand(MI, OpNum + 1, O); 263 O << ']'; 264 return false; 265} 266 267void XCoreAsmPrinter::EmitInstruction(const MachineInstr *MI) { 268 SmallString<128> Str; 269 raw_svector_ostream O(Str); 270 271 switch (MI->getOpcode()) { 272 case XCore::DBG_VALUE: 273 llvm_unreachable("Should be handled target independently"); 274 case XCore::ADD_2rus: 275 if (MI->getOperand(2).getImm() == 0) { 276 O << "\tmov " 277 << XCoreInstPrinter::getRegisterName(MI->getOperand(0).getReg()) << ", " 278 << XCoreInstPrinter::getRegisterName(MI->getOperand(1).getReg()); 279 OutStreamer->EmitRawText(O.str()); 280 return; 281 } 282 break; 283 case XCore::BR_JT: 284 case XCore::BR_JT32: 285 O << "\tbru " 286 << XCoreInstPrinter::getRegisterName(MI->getOperand(1).getReg()) << '\n'; 287 if (MI->getOpcode() == XCore::BR_JT) 288 printInlineJT(MI, 0, O); 289 else 290 printInlineJT32(MI, 0, O); 291 O << '\n'; 292 OutStreamer->EmitRawText(O.str()); 293 return; 294 } 295 296 MCInst TmpInst; 297 MCInstLowering.Lower(MI, TmpInst); 298 299 EmitToStreamer(*OutStreamer, TmpInst); 300} 301 302// Force static initialization. 303extern "C" void LLVMInitializeXCoreAsmPrinter() { 304 RegisterAsmPrinter<XCoreAsmPrinter> X(TheXCoreTarget); 305} 306