slang_backend.cpp revision ac4e18584b8768b3f68535fa5f16232e03974323
1/* 2 * Copyright 2010, The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include "slang_backend.h" 18 19#include <string> 20#include <vector> 21 22#include "bcinfo/BitcodeWrapper.h" 23 24#include "clang/AST/ASTContext.h" 25#include "clang/AST/Decl.h" 26#include "clang/AST/DeclGroup.h" 27 28#include "clang/Basic/Diagnostic.h" 29#include "clang/Basic/TargetInfo.h" 30#include "clang/Basic/TargetOptions.h" 31 32#include "clang/CodeGen/ModuleBuilder.h" 33 34#include "clang/Frontend/CodeGenOptions.h" 35#include "clang/Frontend/FrontendDiagnostic.h" 36 37#include "llvm/Assembly/PrintModulePass.h" 38 39#include "llvm/Bitcode/ReaderWriter.h" 40 41#include "llvm/CodeGen/RegAllocRegistry.h" 42#include "llvm/CodeGen/SchedulerRegistry.h" 43 44#include "llvm/LLVMContext.h" 45#include "llvm/Module.h" 46#include "llvm/Metadata.h" 47 48#include "llvm/Transforms/IPO/PassManagerBuilder.h" 49 50#include "llvm/Target/TargetData.h" 51#include "llvm/Target/TargetMachine.h" 52#include "llvm/Target/TargetOptions.h" 53#include "llvm/Support/TargetRegistry.h" 54 55#include "llvm/MC/SubtargetFeature.h" 56 57#include "slang_assert.h" 58#include "BitWriter_2_9/ReaderWriter_2_9.h" 59#include "BitWriter_2_9_func/ReaderWriter_2_9_func.h" 60 61namespace slang { 62 63void Backend::CreateFunctionPasses() { 64 if (!mPerFunctionPasses) { 65 mPerFunctionPasses = new llvm::FunctionPassManager(mpModule); 66 mPerFunctionPasses->add(new llvm::TargetData(mpModule)); 67 68 llvm::PassManagerBuilder PMBuilder; 69 PMBuilder.OptLevel = mCodeGenOpts.OptimizationLevel; 70 PMBuilder.populateFunctionPassManager(*mPerFunctionPasses); 71 } 72 return; 73} 74 75void Backend::CreateModulePasses() { 76 if (!mPerModulePasses) { 77 mPerModulePasses = new llvm::PassManager(); 78 mPerModulePasses->add(new llvm::TargetData(mpModule)); 79 80 llvm::PassManagerBuilder PMBuilder; 81 PMBuilder.OptLevel = mCodeGenOpts.OptimizationLevel; 82 PMBuilder.SizeLevel = mCodeGenOpts.OptimizeSize; 83 PMBuilder.SizeLevel = mCodeGenOpts.OptimizeSize; 84 if (mCodeGenOpts.UnitAtATime) { 85 PMBuilder.DisableUnitAtATime = 0; 86 } else { 87 PMBuilder.DisableUnitAtATime = 1; 88 } 89 90 if (mCodeGenOpts.UnrollLoops) { 91 PMBuilder.DisableUnrollLoops = 0; 92 } else { 93 PMBuilder.DisableUnrollLoops = 1; 94 } 95 96 PMBuilder.DisableSimplifyLibCalls = false; 97 PMBuilder.populateModulePassManager(*mPerModulePasses); 98 } 99 return; 100} 101 102bool Backend::CreateCodeGenPasses() { 103 if ((mOT != Slang::OT_Assembly) && (mOT != Slang::OT_Object)) 104 return true; 105 106 // Now we add passes for code emitting 107 if (mCodeGenPasses) { 108 return true; 109 } else { 110 mCodeGenPasses = new llvm::FunctionPassManager(mpModule); 111 mCodeGenPasses->add(new llvm::TargetData(mpModule)); 112 } 113 114 // Create the TargetMachine for generating code. 115 std::string Triple = mpModule->getTargetTriple(); 116 117 std::string Error; 118 const llvm::Target* TargetInfo = 119 llvm::TargetRegistry::lookupTarget(Triple, Error); 120 if (TargetInfo == NULL) { 121 mDiagEngine.Report(clang::diag::err_fe_unable_to_create_target) << Error; 122 return false; 123 } 124 125 // Target Machine Options 126 llvm::TargetOptions Options; 127 128 Options.NoFramePointerElim = mCodeGenOpts.DisableFPElim; 129 130 // Use hardware FPU. 131 // 132 // FIXME: Need to detect the CPU capability and decide whether to use softfp. 133 // To use softfp, change following 2 lines to 134 // 135 // Options.FloatABIType = llvm::FloatABI::Soft; 136 // Options.UseSoftFloat = true; 137 Options.FloatABIType = llvm::FloatABI::Hard; 138 Options.UseSoftFloat = false; 139 140 // BCC needs all unknown symbols resolved at compilation time. So we don't 141 // need any relocation model. 142 llvm::Reloc::Model RM = llvm::Reloc::Static; 143 144 // This is set for the linker (specify how large of the virtual addresses we 145 // can access for all unknown symbols.) 146 llvm::CodeModel::Model CM; 147 if (mpModule->getPointerSize() == llvm::Module::Pointer32) { 148 CM = llvm::CodeModel::Small; 149 } else { 150 // The target may have pointer size greater than 32 (e.g. x86_64 151 // architecture) may need large data address model 152 CM = llvm::CodeModel::Medium; 153 } 154 155 // Setup feature string 156 std::string FeaturesStr; 157 if (mTargetOpts.CPU.size() || mTargetOpts.Features.size()) { 158 llvm::SubtargetFeatures Features; 159 160 for (std::vector<std::string>::const_iterator 161 I = mTargetOpts.Features.begin(), E = mTargetOpts.Features.end(); 162 I != E; 163 I++) 164 Features.AddFeature(*I); 165 166 FeaturesStr = Features.getString(); 167 } 168 169 llvm::TargetMachine *TM = 170 TargetInfo->createTargetMachine(Triple, mTargetOpts.CPU, FeaturesStr, 171 Options, RM, CM); 172 173 // Register scheduler 174 llvm::RegisterScheduler::setDefault(llvm::createDefaultScheduler); 175 176 // Register allocation policy: 177 // createFastRegisterAllocator: fast but bad quality 178 // createGreedyRegisterAllocator: not so fast but good quality 179 llvm::RegisterRegAlloc::setDefault((mCodeGenOpts.OptimizationLevel == 0) ? 180 llvm::createFastRegisterAllocator : 181 llvm::createGreedyRegisterAllocator); 182 183 llvm::CodeGenOpt::Level OptLevel = llvm::CodeGenOpt::Default; 184 if (mCodeGenOpts.OptimizationLevel == 0) { 185 OptLevel = llvm::CodeGenOpt::None; 186 } else if (mCodeGenOpts.OptimizationLevel == 3) { 187 OptLevel = llvm::CodeGenOpt::Aggressive; 188 } 189 190 llvm::TargetMachine::CodeGenFileType CGFT = 191 llvm::TargetMachine::CGFT_AssemblyFile; 192 if (mOT == Slang::OT_Object) { 193 CGFT = llvm::TargetMachine::CGFT_ObjectFile; 194 } 195 if (TM->addPassesToEmitFile(*mCodeGenPasses, FormattedOutStream, 196 CGFT, OptLevel)) { 197 mDiagEngine.Report(clang::diag::err_fe_unable_to_interface_with_target); 198 return false; 199 } 200 201 return true; 202} 203 204Backend::Backend(clang::DiagnosticsEngine *DiagEngine, 205 const clang::CodeGenOptions &CodeGenOpts, 206 const clang::TargetOptions &TargetOpts, 207 PragmaList *Pragmas, 208 llvm::raw_ostream *OS, 209 Slang::OutputType OT) 210 : ASTConsumer(), 211 mCodeGenOpts(CodeGenOpts), 212 mTargetOpts(TargetOpts), 213 mpModule(NULL), 214 mpOS(OS), 215 mOT(OT), 216 mGen(NULL), 217 mPerFunctionPasses(NULL), 218 mPerModulePasses(NULL), 219 mCodeGenPasses(NULL), 220 mLLVMContext(llvm::getGlobalContext()), 221 mDiagEngine(*DiagEngine), 222 mPragmas(Pragmas) { 223 FormattedOutStream.setStream(*mpOS, 224 llvm::formatted_raw_ostream::PRESERVE_STREAM); 225 mGen = CreateLLVMCodeGen(mDiagEngine, "", mCodeGenOpts, mLLVMContext); 226 return; 227} 228 229void Backend::Initialize(clang::ASTContext &Ctx) { 230 mGen->Initialize(Ctx); 231 232 mpModule = mGen->GetModule(); 233 234 return; 235} 236 237// Encase the Bitcode in a wrapper containing RS version information. 238void Backend::WrapBitcode(llvm::raw_string_ostream &Bitcode) { 239 struct bcinfo::BCWrapperHeader header; 240 header.Magic = 0x0B17C0DE; 241 header.Version = 0; 242 header.BitcodeOffset = sizeof(header); 243 header.BitcodeSize = Bitcode.str().length(); 244 header.HeaderVersion = 0; 245 header.TargetAPI = getTargetAPI(); 246 247 // Write out the bitcode wrapper. 248 FormattedOutStream.write((const char*) &header, sizeof(header)); 249 250 // Write out the actual encoded bitcode. 251 FormattedOutStream << Bitcode.str(); 252 return; 253} 254 255bool Backend::HandleTopLevelDecl(clang::DeclGroupRef D) { 256 return mGen->HandleTopLevelDecl(D); 257} 258 259void Backend::HandleTranslationUnit(clang::ASTContext &Ctx) { 260 HandleTranslationUnitPre(Ctx); 261 262 mGen->HandleTranslationUnit(Ctx); 263 264 // Here, we complete a translation unit (whole translation unit is now in LLVM 265 // IR). Now, interact with LLVM backend to generate actual machine code (asm 266 // or machine code, whatever.) 267 268 // Silently ignore if we weren't initialized for some reason. 269 if (!mpModule) 270 return; 271 272 llvm::Module *M = mGen->ReleaseModule(); 273 if (!M) { 274 // The module has been released by IR gen on failures, do not double free. 275 mpModule = NULL; 276 return; 277 } 278 279 slangAssert(mpModule == M && 280 "Unexpected module change during LLVM IR generation"); 281 282 // Insert #pragma information into metadata section of module 283 if (!mPragmas->empty()) { 284 llvm::NamedMDNode *PragmaMetadata = 285 mpModule->getOrInsertNamedMetadata(Slang::PragmaMetadataName); 286 for (PragmaList::const_iterator I = mPragmas->begin(), E = mPragmas->end(); 287 I != E; 288 I++) { 289 llvm::SmallVector<llvm::Value*, 2> Pragma; 290 // Name goes first 291 Pragma.push_back(llvm::MDString::get(mLLVMContext, I->first)); 292 // And then value 293 Pragma.push_back(llvm::MDString::get(mLLVMContext, I->second)); 294 295 // Create MDNode and insert into PragmaMetadata 296 PragmaMetadata->addOperand( 297 llvm::MDNode::get(mLLVMContext, Pragma)); 298 } 299 } 300 301 HandleTranslationUnitPost(mpModule); 302 303 // Create passes for optimization and code emission 304 305 // Create and run per-function passes 306 CreateFunctionPasses(); 307 if (mPerFunctionPasses) { 308 mPerFunctionPasses->doInitialization(); 309 310 for (llvm::Module::iterator I = mpModule->begin(), E = mpModule->end(); 311 I != E; 312 I++) 313 if (!I->isDeclaration()) 314 mPerFunctionPasses->run(*I); 315 316 mPerFunctionPasses->doFinalization(); 317 } 318 319 // Create and run module passes 320 CreateModulePasses(); 321 if (mPerModulePasses) 322 mPerModulePasses->run(*mpModule); 323 324 switch (mOT) { 325 case Slang::OT_Assembly: 326 case Slang::OT_Object: { 327 if (!CreateCodeGenPasses()) 328 return; 329 330 mCodeGenPasses->doInitialization(); 331 332 for (llvm::Module::iterator I = mpModule->begin(), E = mpModule->end(); 333 I != E; 334 I++) 335 if (!I->isDeclaration()) 336 mCodeGenPasses->run(*I); 337 338 mCodeGenPasses->doFinalization(); 339 break; 340 } 341 case Slang::OT_LLVMAssembly: { 342 llvm::PassManager *LLEmitPM = new llvm::PassManager(); 343 LLEmitPM->add(llvm::createPrintModulePass(&FormattedOutStream)); 344 LLEmitPM->run(*mpModule); 345 break; 346 } 347 case Slang::OT_Bitcode: { 348 llvm::PassManager *BCEmitPM = new llvm::PassManager(); 349 std::string BCStr; 350 llvm::raw_string_ostream Bitcode(BCStr); 351 unsigned int TargetAPI = getTargetAPI(); 352 switch (TargetAPI) { 353 case SLANG_HC_TARGET_API: 354 case SLANG_HC_MR1_TARGET_API: 355 case SLANG_HC_MR2_TARGET_API: { 356 // Pre-ICS targets must use the LLVM 2.9 BitcodeWriter 357 BCEmitPM->add(llvm_2_9::createBitcodeWriterPass(Bitcode)); 358 break; 359 } 360 case SLANG_ICS_TARGET_API: 361 case SLANG_ICS_MR1_TARGET_API: { 362 // ICS targets must use the LLVM 2.9_func BitcodeWriter 363 BCEmitPM->add(llvm_2_9_func::createBitcodeWriterPass(Bitcode)); 364 break; 365 } 366 default: { 367 if (TargetAPI < SLANG_MINIMUM_TARGET_API || 368 TargetAPI > SLANG_MAXIMUM_TARGET_API) { 369 slangAssert(false && "Invalid target API value"); 370 } 371 BCEmitPM->add(llvm::createBitcodeWriterPass(Bitcode)); 372 break; 373 } 374 } 375 376 BCEmitPM->run(*mpModule); 377 WrapBitcode(Bitcode); 378 break; 379 } 380 case Slang::OT_Nothing: { 381 return; 382 } 383 default: { 384 slangAssert(false && "Unknown output type"); 385 } 386 } 387 388 FormattedOutStream.flush(); 389 390 return; 391} 392 393void Backend::HandleTagDeclDefinition(clang::TagDecl *D) { 394 mGen->HandleTagDeclDefinition(D); 395 return; 396} 397 398void Backend::CompleteTentativeDefinition(clang::VarDecl *D) { 399 mGen->CompleteTentativeDefinition(D); 400 return; 401} 402 403Backend::~Backend() { 404 delete mpModule; 405 delete mGen; 406 delete mPerFunctionPasses; 407 delete mPerModulePasses; 408 delete mCodeGenPasses; 409 return; 410} 411 412} // namespace slang 413