1//===-- LLVMTargetMachine.cpp - Implement the LLVMTargetMachine class -----===// 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 implements the LLVMTargetMachine class. 11// 12//===----------------------------------------------------------------------===// 13 14#include "llvm/Target/TargetMachine.h" 15#include "llvm/ADT/OwningPtr.h" 16#include "llvm/Assembly/PrintModulePass.h" 17#include "llvm/CodeGen/AsmPrinter.h" 18#include "llvm/CodeGen/MachineFunctionAnalysis.h" 19#include "llvm/CodeGen/MachineModuleInfo.h" 20#include "llvm/CodeGen/Passes.h" 21#include "llvm/MC/MCAsmInfo.h" 22#include "llvm/MC/MCContext.h" 23#include "llvm/MC/MCInstrInfo.h" 24#include "llvm/MC/MCStreamer.h" 25#include "llvm/MC/MCSubtargetInfo.h" 26#include "llvm/PassManager.h" 27#include "llvm/Support/CommandLine.h" 28#include "llvm/Support/ErrorHandling.h" 29#include "llvm/Support/FormattedStream.h" 30#include "llvm/Support/TargetRegistry.h" 31#include "llvm/Target/TargetInstrInfo.h" 32#include "llvm/Target/TargetLowering.h" 33#include "llvm/Target/TargetLoweringObjectFile.h" 34#include "llvm/Target/TargetOptions.h" 35#include "llvm/Target/TargetRegisterInfo.h" 36#include "llvm/Target/TargetSubtargetInfo.h" 37#include "llvm/Transforms/Scalar.h" 38using namespace llvm; 39 40// Enable or disable FastISel. Both options are needed, because 41// FastISel is enabled by default with -fast, and we wish to be 42// able to enable or disable fast-isel independently from -O0. 43static cl::opt<cl::boolOrDefault> 44EnableFastISelOption("fast-isel", cl::Hidden, 45 cl::desc("Enable the \"fast\" instruction selector")); 46 47static cl::opt<bool> ShowMCEncoding("show-mc-encoding", cl::Hidden, 48 cl::desc("Show encoding in .s output")); 49static cl::opt<bool> ShowMCInst("show-mc-inst", cl::Hidden, 50 cl::desc("Show instruction structure in .s output")); 51 52static cl::opt<cl::boolOrDefault> 53AsmVerbose("asm-verbose", cl::desc("Add comments to directives."), 54 cl::init(cl::BOU_UNSET)); 55 56static bool getVerboseAsm() { 57 switch (AsmVerbose) { 58 case cl::BOU_UNSET: return TargetMachine::getAsmVerbosityDefault(); 59 case cl::BOU_TRUE: return true; 60 case cl::BOU_FALSE: return false; 61 } 62 llvm_unreachable("Invalid verbose asm state"); 63} 64 65LLVMTargetMachine::LLVMTargetMachine(const Target &T, StringRef Triple, 66 StringRef CPU, StringRef FS, 67 TargetOptions Options, 68 Reloc::Model RM, CodeModel::Model CM, 69 CodeGenOpt::Level OL) 70 : TargetMachine(T, Triple, CPU, FS, Options) { 71 CodeGenInfo = T.createMCCodeGenInfo(Triple, RM, CM, OL); 72 AsmInfo = T.createMCAsmInfo(Triple); 73 // TargetSelect.h moved to a different directory between LLVM 2.9 and 3.0, 74 // and if the old one gets included then MCAsmInfo will be NULL and 75 // we'll crash later. 76 // Provide the user with a useful error message about what's wrong. 77 assert(AsmInfo && "MCAsmInfo not initialized." 78 "Make sure you include the correct TargetSelect.h" 79 "and that InitializeAllTargetMCs() is being invoked!"); 80} 81 82void LLVMTargetMachine::addAnalysisPasses(PassManagerBase &PM) { 83 PM.add(createBasicTargetTransformInfoPass(getTargetLowering())); 84} 85 86/// addPassesToX helper drives creation and initialization of TargetPassConfig. 87static MCContext *addPassesToGenerateCode(LLVMTargetMachine *TM, 88 PassManagerBase &PM, 89 bool DisableVerify, 90 AnalysisID StartAfter, 91 AnalysisID StopAfter) { 92 // Targets may override createPassConfig to provide a target-specific sublass. 93 TargetPassConfig *PassConfig = TM->createPassConfig(PM); 94 PassConfig->setStartStopPasses(StartAfter, StopAfter); 95 96 // Set PassConfig options provided by TargetMachine. 97 PassConfig->setDisableVerify(DisableVerify); 98 99 PM.add(PassConfig); 100 101 PassConfig->addIRPasses(); 102 103 PassConfig->addCodeGenPrepare(); 104 105 PassConfig->addPassesToHandleExceptions(); 106 107 PassConfig->addISelPrepare(); 108 109 // Install a MachineModuleInfo class, which is an immutable pass that holds 110 // all the per-module stuff we're generating, including MCContext. 111 MachineModuleInfo *MMI = 112 new MachineModuleInfo(*TM->getMCAsmInfo(), *TM->getRegisterInfo(), 113 &TM->getTargetLowering()->getObjFileLowering()); 114 PM.add(MMI); 115 MCContext *Context = &MMI->getContext(); // Return the MCContext by-ref. 116 117 // Set up a MachineFunction for the rest of CodeGen to work on. 118 PM.add(new MachineFunctionAnalysis(*TM)); 119 120 // Enable FastISel with -fast, but allow that to be overridden. 121 if (EnableFastISelOption == cl::BOU_TRUE || 122 (TM->getOptLevel() == CodeGenOpt::None && 123 EnableFastISelOption != cl::BOU_FALSE)) 124 TM->setFastISel(true); 125 126 // Ask the target for an isel. 127 if (PassConfig->addInstSelector()) 128 return NULL; 129 130 PassConfig->addMachinePasses(); 131 132 PassConfig->setInitialized(); 133 134 return Context; 135} 136 137bool LLVMTargetMachine::addPassesToEmitFile(PassManagerBase &PM, 138 formatted_raw_ostream &Out, 139 CodeGenFileType FileType, 140 bool DisableVerify, 141 AnalysisID StartAfter, 142 AnalysisID StopAfter) { 143 // Add common CodeGen passes. 144 MCContext *Context = addPassesToGenerateCode(this, PM, DisableVerify, 145 StartAfter, StopAfter); 146 if (!Context) 147 return true; 148 149 if (StopAfter) { 150 // FIXME: The intent is that this should eventually write out a YAML file, 151 // containing the LLVM IR, the machine-level IR (when stopping after a 152 // machine-level pass), and whatever other information is needed to 153 // deserialize the code and resume compilation. For now, just write the 154 // LLVM IR. 155 PM.add(createPrintModulePass(&Out)); 156 return false; 157 } 158 159 if (hasMCSaveTempLabels()) 160 Context->setAllowTemporaryLabels(false); 161 162 const MCAsmInfo &MAI = *getMCAsmInfo(); 163 const MCRegisterInfo &MRI = *getRegisterInfo(); 164 const MCSubtargetInfo &STI = getSubtarget<MCSubtargetInfo>(); 165 OwningPtr<MCStreamer> AsmStreamer; 166 167 switch (FileType) { 168 case CGFT_AssemblyFile: { 169 MCInstPrinter *InstPrinter = 170 getTarget().createMCInstPrinter(MAI.getAssemblerDialect(), MAI, 171 *getInstrInfo(), 172 Context->getRegisterInfo(), STI); 173 174 // Create a code emitter if asked to show the encoding. 175 MCCodeEmitter *MCE = 0; 176 MCAsmBackend *MAB = 0; 177 if (ShowMCEncoding) { 178 const MCSubtargetInfo &STI = getSubtarget<MCSubtargetInfo>(); 179 MCE = getTarget().createMCCodeEmitter(*getInstrInfo(), MRI, STI, 180 *Context); 181 MAB = getTarget().createMCAsmBackend(getTargetTriple(), TargetCPU); 182 } 183 184 MCStreamer *S = getTarget().createAsmStreamer(*Context, Out, 185 getVerboseAsm(), 186 hasMCUseLoc(), 187 hasMCUseCFI(), 188 hasMCUseDwarfDirectory(), 189 InstPrinter, 190 MCE, MAB, 191 ShowMCInst); 192 AsmStreamer.reset(S); 193 break; 194 } 195 case CGFT_ObjectFile: { 196 // Create the code emitter for the target if it exists. If not, .o file 197 // emission fails. 198 MCCodeEmitter *MCE = getTarget().createMCCodeEmitter(*getInstrInfo(), MRI, 199 STI, *Context); 200 MCAsmBackend *MAB = getTarget().createMCAsmBackend(getTargetTriple(), 201 TargetCPU); 202 if (MCE == 0 || MAB == 0) 203 return true; 204 205 AsmStreamer.reset(getTarget().createMCObjectStreamer(getTargetTriple(), 206 *Context, *MAB, Out, 207 MCE, hasMCRelaxAll(), 208 hasMCNoExecStack())); 209 AsmStreamer.get()->setAutoInitSections(true); 210 break; 211 } 212 case CGFT_Null: 213 // The Null output is intended for use for performance analysis and testing, 214 // not real users. 215 AsmStreamer.reset(createNullStreamer(*Context)); 216 break; 217 } 218 219 // Create the AsmPrinter, which takes ownership of AsmStreamer if successful. 220 FunctionPass *Printer = getTarget().createAsmPrinter(*this, *AsmStreamer); 221 if (Printer == 0) 222 return true; 223 224 // If successful, createAsmPrinter took ownership of AsmStreamer. 225 AsmStreamer.take(); 226 227 PM.add(Printer); 228 229 return false; 230} 231 232/// addPassesToEmitMachineCode - Add passes to the specified pass manager to 233/// get machine code emitted. This uses a JITCodeEmitter object to handle 234/// actually outputting the machine code and resolving things like the address 235/// of functions. This method should returns true if machine code emission is 236/// not supported. 237/// 238bool LLVMTargetMachine::addPassesToEmitMachineCode(PassManagerBase &PM, 239 JITCodeEmitter &JCE, 240 bool DisableVerify) { 241 // Add common CodeGen passes. 242 MCContext *Context = addPassesToGenerateCode(this, PM, DisableVerify, 0, 0); 243 if (!Context) 244 return true; 245 246 addCodeEmitter(PM, JCE); 247 248 return false; // success! 249} 250 251/// addPassesToEmitMC - Add passes to the specified pass manager to get 252/// machine code emitted with the MCJIT. This method returns true if machine 253/// code is not supported. It fills the MCContext Ctx pointer which can be 254/// used to build custom MCStreamer. 255/// 256bool LLVMTargetMachine::addPassesToEmitMC(PassManagerBase &PM, 257 MCContext *&Ctx, 258 raw_ostream &Out, 259 bool DisableVerify) { 260 // Add common CodeGen passes. 261 Ctx = addPassesToGenerateCode(this, PM, DisableVerify, 0, 0); 262 if (!Ctx) 263 return true; 264 265 if (hasMCSaveTempLabels()) 266 Ctx->setAllowTemporaryLabels(false); 267 268 // Create the code emitter for the target if it exists. If not, .o file 269 // emission fails. 270 const MCRegisterInfo &MRI = *getRegisterInfo(); 271 const MCSubtargetInfo &STI = getSubtarget<MCSubtargetInfo>(); 272 MCCodeEmitter *MCE = getTarget().createMCCodeEmitter(*getInstrInfo(), MRI, 273 STI, *Ctx); 274 MCAsmBackend *MAB = getTarget().createMCAsmBackend(getTargetTriple(), TargetCPU); 275 if (MCE == 0 || MAB == 0) 276 return true; 277 278 OwningPtr<MCStreamer> AsmStreamer; 279 AsmStreamer.reset(getTarget().createMCObjectStreamer(getTargetTriple(), *Ctx, 280 *MAB, Out, MCE, 281 hasMCRelaxAll(), 282 hasMCNoExecStack())); 283 AsmStreamer.get()->InitSections(); 284 285 // Create the AsmPrinter, which takes ownership of AsmStreamer if successful. 286 FunctionPass *Printer = getTarget().createAsmPrinter(*this, *AsmStreamer); 287 if (Printer == 0) 288 return true; 289 290 // If successful, createAsmPrinter took ownership of AsmStreamer. 291 AsmStreamer.take(); 292 293 PM.add(Printer); 294 295 return false; // success! 296} 297