1 //===-------------- AddDebugInfo.cpp -- add debug info -------------------===// 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 //===----------------------------------------------------------------------===// 10 /// \file 11 /// This pass populates some debug information for the module and functions. 12 //===----------------------------------------------------------------------===// 13 14 #include "DebugTypeGenerator.h" 15 #include "flang/Common/Version.h" 16 #include "flang/Optimizer/Builder/FIRBuilder.h" 17 #include "flang/Optimizer/Builder/Todo.h" 18 #include "flang/Optimizer/CodeGen/CGOps.h" 19 #include "flang/Optimizer/Dialect/FIRDialect.h" 20 #include "flang/Optimizer/Dialect/FIROps.h" 21 #include "flang/Optimizer/Dialect/FIRType.h" 22 #include "flang/Optimizer/Dialect/Support/FIRContext.h" 23 #include "flang/Optimizer/Support/InternalNames.h" 24 #include "flang/Optimizer/Transforms/Passes.h" 25 #include "mlir/Dialect/Func/IR/FuncOps.h" 26 #include "mlir/Dialect/LLVMIR/LLVMDialect.h" 27 #include "mlir/IR/Matchers.h" 28 #include "mlir/IR/TypeUtilities.h" 29 #include "mlir/Pass/Pass.h" 30 #include "mlir/Transforms/DialectConversion.h" 31 #include "mlir/Transforms/GreedyPatternRewriteDriver.h" 32 #include "mlir/Transforms/RegionUtils.h" 33 #include "llvm/BinaryFormat/Dwarf.h" 34 #include "llvm/Support/Debug.h" 35 #include "llvm/Support/FileSystem.h" 36 #include "llvm/Support/Path.h" 37 #include "llvm/Support/raw_ostream.h" 38 39 namespace fir { 40 #define GEN_PASS_DEF_ADDDEBUGINFO 41 #include "flang/Optimizer/Transforms/Passes.h.inc" 42 } // namespace fir 43 44 #define DEBUG_TYPE "flang-add-debug-info" 45 46 namespace { 47 48 class AddDebugInfoPass : public fir::impl::AddDebugInfoBase<AddDebugInfoPass> { 49 void handleDeclareOp(fir::cg::XDeclareOp declOp, 50 mlir::LLVM::DIFileAttr fileAttr, 51 mlir::LLVM::DIScopeAttr scopeAttr, 52 fir::DebugTypeGenerator &typeGen, 53 mlir::SymbolTable *symbolTable); 54 55 public: 56 AddDebugInfoPass(fir::AddDebugInfoOptions options) : Base(options) {} 57 void runOnOperation() override; 58 59 private: 60 llvm::StringMap<mlir::LLVM::DIModuleAttr> moduleMap; 61 62 mlir::LLVM::DIModuleAttr getOrCreateModuleAttr( 63 const std::string &name, mlir::LLVM::DIFileAttr fileAttr, 64 mlir::LLVM::DIScopeAttr scope, unsigned line, bool decl); 65 66 void handleGlobalOp(fir::GlobalOp glocalOp, mlir::LLVM::DIFileAttr fileAttr, 67 mlir::LLVM::DIScopeAttr scope, 68 mlir::SymbolTable *symbolTable); 69 void handleFuncOp(mlir::func::FuncOp funcOp, mlir::LLVM::DIFileAttr fileAttr, 70 mlir::LLVM::DICompileUnitAttr cuAttr, 71 mlir::SymbolTable *symbolTable); 72 }; 73 74 static uint32_t getLineFromLoc(mlir::Location loc) { 75 uint32_t line = 1; 76 if (auto fileLoc = mlir::dyn_cast<mlir::FileLineColLoc>(loc)) 77 line = fileLoc.getLine(); 78 return line; 79 } 80 81 bool debugInfoIsAlreadySet(mlir::Location loc) { 82 if (mlir::isa<mlir::FusedLoc>(loc)) { 83 if (loc->findInstanceOf<mlir::FusedLocWith<fir::LocationKindAttr>>()) 84 return false; 85 return true; 86 } 87 return false; 88 } 89 90 } // namespace 91 92 void AddDebugInfoPass::handleDeclareOp(fir::cg::XDeclareOp declOp, 93 mlir::LLVM::DIFileAttr fileAttr, 94 mlir::LLVM::DIScopeAttr scopeAttr, 95 fir::DebugTypeGenerator &typeGen, 96 mlir::SymbolTable *symbolTable) { 97 mlir::MLIRContext *context = &getContext(); 98 mlir::OpBuilder builder(context); 99 auto result = fir::NameUniquer::deconstruct(declOp.getUniqName()); 100 101 if (result.first != fir::NameUniquer::NameKind::VARIABLE) 102 return; 103 104 // If this DeclareOp actually represents a global then treat it as such. 105 if (auto global = symbolTable->lookup<fir::GlobalOp>(declOp.getUniqName())) { 106 handleGlobalOp(global, fileAttr, scopeAttr, symbolTable); 107 return; 108 } 109 110 // Only accept local variables. 111 if (result.second.procs.empty()) 112 return; 113 114 // FIXME: There may be cases where an argument is processed a bit before 115 // DeclareOp is generated. In that case, DeclareOp may point to an 116 // intermediate op and not to BlockArgument. 117 // Moreover, with MLIR inlining we cannot use the BlockArgument 118 // position to identify the original number of the dummy argument. 119 // If we want to keep running AddDebugInfoPass late, the dummy argument 120 // position in the argument list has to be expressed in FIR (e.g. as a 121 // constant attribute of [hl]fir.declare/fircg.ext_declare operation that has 122 // a dummy_scope operand). 123 unsigned argNo = 0; 124 if (fir::isDummyArgument(declOp.getMemref())) { 125 auto arg = llvm::cast<mlir::BlockArgument>(declOp.getMemref()); 126 argNo = arg.getArgNumber() + 1; 127 } 128 129 auto tyAttr = typeGen.convertType(fir::unwrapRefType(declOp.getType()), 130 fileAttr, scopeAttr, declOp.getLoc()); 131 132 auto localVarAttr = mlir::LLVM::DILocalVariableAttr::get( 133 context, scopeAttr, mlir::StringAttr::get(context, result.second.name), 134 fileAttr, getLineFromLoc(declOp.getLoc()), argNo, /* alignInBits*/ 0, 135 tyAttr, mlir::LLVM::DIFlags::Zero); 136 declOp->setLoc(builder.getFusedLoc({declOp->getLoc()}, localVarAttr)); 137 } 138 139 // The `module` does not have a first class representation in the `FIR`. We 140 // extract information about it from the name of the identifiers and keep a 141 // map to avoid duplication. 142 mlir::LLVM::DIModuleAttr AddDebugInfoPass::getOrCreateModuleAttr( 143 const std::string &name, mlir::LLVM::DIFileAttr fileAttr, 144 mlir::LLVM::DIScopeAttr scope, unsigned line, bool decl) { 145 mlir::MLIRContext *context = &getContext(); 146 mlir::LLVM::DIModuleAttr modAttr; 147 if (auto iter{moduleMap.find(name)}; iter != moduleMap.end()) { 148 modAttr = iter->getValue(); 149 } else { 150 modAttr = mlir::LLVM::DIModuleAttr::get( 151 context, fileAttr, scope, mlir::StringAttr::get(context, name), 152 /* configMacros */ mlir::StringAttr(), 153 /* includePath */ mlir::StringAttr(), 154 /* apinotes */ mlir::StringAttr(), line, decl); 155 moduleMap[name] = modAttr; 156 } 157 return modAttr; 158 } 159 160 void AddDebugInfoPass::handleGlobalOp(fir::GlobalOp globalOp, 161 mlir::LLVM::DIFileAttr fileAttr, 162 mlir::LLVM::DIScopeAttr scope, 163 mlir::SymbolTable *symbolTable) { 164 if (debugInfoIsAlreadySet(globalOp.getLoc())) 165 return; 166 mlir::ModuleOp module = getOperation(); 167 mlir::MLIRContext *context = &getContext(); 168 fir::DebugTypeGenerator typeGen(module); 169 mlir::OpBuilder builder(context); 170 171 std::pair result = fir::NameUniquer::deconstruct(globalOp.getSymName()); 172 if (result.first != fir::NameUniquer::NameKind::VARIABLE) 173 return; 174 175 unsigned line = getLineFromLoc(globalOp.getLoc()); 176 177 // DWARF5 says following about the fortran modules: 178 // A Fortran 90 module may also be represented by a module entry 179 // (but no declaration attribute is warranted because Fortran has no concept 180 // of a corresponding module body). 181 // But in practice, compilers use declaration attribute with a module in cases 182 // where module was defined in another source file (only being used in this 183 // one). The isInitialized() seems to provide the right information 184 // but inverted. It is true where module is actually defined but false where 185 // it is used. 186 // FIXME: Currently we don't have the line number on which a module was 187 // declared. We are using a best guess of line - 1 where line is the source 188 // line of the first member of the module that we encounter. 189 190 if (result.second.procs.empty()) { 191 // Only look for module if this variable is not part of a function. 192 if (result.second.modules.empty()) 193 return; 194 195 // Modules are generated at compile unit scope 196 if (mlir::LLVM::DISubprogramAttr sp = 197 mlir::dyn_cast_if_present<mlir::LLVM::DISubprogramAttr>(scope)) 198 scope = sp.getCompileUnit(); 199 200 scope = getOrCreateModuleAttr(result.second.modules[0], fileAttr, scope, 201 line - 1, !globalOp.isInitialized()); 202 } 203 mlir::LLVM::DITypeAttr diType = typeGen.convertType( 204 globalOp.getType(), fileAttr, scope, globalOp.getLoc()); 205 auto gvAttr = mlir::LLVM::DIGlobalVariableAttr::get( 206 context, scope, mlir::StringAttr::get(context, result.second.name), 207 mlir::StringAttr::get(context, globalOp.getName()), fileAttr, line, 208 diType, /*isLocalToUnit*/ false, 209 /*isDefinition*/ globalOp.isInitialized(), /* alignInBits*/ 0); 210 globalOp->setLoc(builder.getFusedLoc({globalOp->getLoc()}, gvAttr)); 211 } 212 213 void AddDebugInfoPass::handleFuncOp(mlir::func::FuncOp funcOp, 214 mlir::LLVM::DIFileAttr fileAttr, 215 mlir::LLVM::DICompileUnitAttr cuAttr, 216 mlir::SymbolTable *symbolTable) { 217 mlir::Location l = funcOp->getLoc(); 218 // If fused location has already been created then nothing to do 219 // Otherwise, create a fused location. 220 if (debugInfoIsAlreadySet(l)) 221 return; 222 223 mlir::ModuleOp module = getOperation(); 224 mlir::MLIRContext *context = &getContext(); 225 mlir::OpBuilder builder(context); 226 llvm::StringRef fileName(fileAttr.getName()); 227 llvm::StringRef filePath(fileAttr.getDirectory()); 228 unsigned int CC = (funcOp.getName() == fir::NameUniquer::doProgramEntry()) 229 ? llvm::dwarf::getCallingConvention("DW_CC_program") 230 : llvm::dwarf::getCallingConvention("DW_CC_normal"); 231 232 if (auto funcLoc = mlir::dyn_cast<mlir::FileLineColLoc>(l)) { 233 fileName = llvm::sys::path::filename(funcLoc.getFilename().getValue()); 234 filePath = llvm::sys::path::parent_path(funcLoc.getFilename().getValue()); 235 } 236 237 mlir::StringAttr fullName = mlir::StringAttr::get(context, funcOp.getName()); 238 mlir::Attribute attr = funcOp->getAttr(fir::getInternalFuncNameAttrName()); 239 mlir::StringAttr funcName = 240 (attr) ? mlir::cast<mlir::StringAttr>(attr) 241 : mlir::StringAttr::get(context, funcOp.getName()); 242 243 auto result = fir::NameUniquer::deconstruct(funcName); 244 funcName = mlir::StringAttr::get(context, result.second.name); 245 246 llvm::SmallVector<mlir::LLVM::DITypeAttr> types; 247 fir::DebugTypeGenerator typeGen(module); 248 for (auto resTy : funcOp.getResultTypes()) { 249 auto tyAttr = typeGen.convertType(resTy, fileAttr, cuAttr, funcOp.getLoc()); 250 types.push_back(tyAttr); 251 } 252 for (auto inTy : funcOp.getArgumentTypes()) { 253 auto tyAttr = typeGen.convertType(fir::unwrapRefType(inTy), fileAttr, 254 cuAttr, funcOp.getLoc()); 255 types.push_back(tyAttr); 256 } 257 258 mlir::LLVM::DISubroutineTypeAttr subTypeAttr = 259 mlir::LLVM::DISubroutineTypeAttr::get(context, CC, types); 260 mlir::LLVM::DIFileAttr funcFileAttr = 261 mlir::LLVM::DIFileAttr::get(context, fileName, filePath); 262 263 // Only definitions need a distinct identifier and a compilation unit. 264 mlir::DistinctAttr id; 265 mlir::LLVM::DIScopeAttr Scope = fileAttr; 266 mlir::LLVM::DICompileUnitAttr compilationUnit; 267 mlir::LLVM::DISubprogramFlags subprogramFlags = 268 mlir::LLVM::DISubprogramFlags{}; 269 if (isOptimized) 270 subprogramFlags = mlir::LLVM::DISubprogramFlags::Optimized; 271 if (!funcOp.isExternal()) { 272 id = mlir::DistinctAttr::create(mlir::UnitAttr::get(context)); 273 compilationUnit = cuAttr; 274 subprogramFlags = 275 subprogramFlags | mlir::LLVM::DISubprogramFlags::Definition; 276 } 277 unsigned line = getLineFromLoc(l); 278 if (fir::isInternalProcedure(funcOp)) { 279 // For contained functions, the scope is the parent subroutine. 280 mlir::SymbolRefAttr sym = mlir::cast<mlir::SymbolRefAttr>( 281 funcOp->getAttr(fir::getHostSymbolAttrName())); 282 if (sym) { 283 if (auto func = 284 symbolTable->lookup<mlir::func::FuncOp>(sym.getLeafReference())) { 285 // Make sure that parent is processed. 286 handleFuncOp(func, fileAttr, cuAttr, symbolTable); 287 if (auto fusedLoc = 288 mlir::dyn_cast_if_present<mlir::FusedLoc>(func.getLoc())) { 289 if (auto spAttr = 290 mlir::dyn_cast_if_present<mlir::LLVM::DISubprogramAttr>( 291 fusedLoc.getMetadata())) 292 Scope = spAttr; 293 } 294 } 295 } 296 } else if (!result.second.modules.empty()) { 297 Scope = getOrCreateModuleAttr(result.second.modules[0], fileAttr, cuAttr, 298 line - 1, false); 299 } 300 301 auto spAttr = mlir::LLVM::DISubprogramAttr::get( 302 context, id, compilationUnit, Scope, funcName, fullName, funcFileAttr, 303 line, line, subprogramFlags, subTypeAttr); 304 funcOp->setLoc(builder.getFusedLoc({funcOp->getLoc()}, spAttr)); 305 306 // Don't process variables if user asked for line tables only. 307 if (debugLevel == mlir::LLVM::DIEmissionKind::LineTablesOnly) 308 return; 309 310 funcOp.walk([&](fir::cg::XDeclareOp declOp) { 311 handleDeclareOp(declOp, fileAttr, spAttr, typeGen, symbolTable); 312 }); 313 } 314 315 void AddDebugInfoPass::runOnOperation() { 316 mlir::ModuleOp module = getOperation(); 317 mlir::MLIRContext *context = &getContext(); 318 mlir::SymbolTable symbolTable(module); 319 llvm::StringRef fileName; 320 std::string filePath; 321 // We need 2 type of file paths here. 322 // 1. Name of the file as was presented to compiler. This can be absolute 323 // or relative to 2. 324 // 2. Current working directory 325 // 326 // We are also dealing with 2 different situations below. One is normal 327 // compilation where we will have a value in 'inputFilename' and we can 328 // obtain the current directory using 'current_path'. 329 // The 2nd case is when this pass is invoked directly from 'fir-opt' tool. 330 // In that case, 'inputFilename' may be empty. Location embedded in the 331 // module will be used to get file name and its directory. 332 if (inputFilename.empty()) { 333 if (auto fileLoc = mlir::dyn_cast<mlir::FileLineColLoc>(module.getLoc())) { 334 fileName = llvm::sys::path::filename(fileLoc.getFilename().getValue()); 335 filePath = llvm::sys::path::parent_path(fileLoc.getFilename().getValue()); 336 } else 337 fileName = "-"; 338 } else { 339 fileName = inputFilename; 340 llvm::SmallString<256> cwd; 341 if (!llvm::sys::fs::current_path(cwd)) 342 filePath = cwd.str(); 343 } 344 345 mlir::LLVM::DIFileAttr fileAttr = 346 mlir::LLVM::DIFileAttr::get(context, fileName, filePath); 347 mlir::StringAttr producer = 348 mlir::StringAttr::get(context, Fortran::common::getFlangFullVersion()); 349 mlir::LLVM::DICompileUnitAttr cuAttr = mlir::LLVM::DICompileUnitAttr::get( 350 mlir::DistinctAttr::create(mlir::UnitAttr::get(context)), 351 llvm::dwarf::getLanguage("DW_LANG_Fortran95"), fileAttr, producer, 352 isOptimized, debugLevel); 353 354 module.walk([&](mlir::func::FuncOp funcOp) { 355 handleFuncOp(funcOp, fileAttr, cuAttr, &symbolTable); 356 }); 357 // Process any global which was not processed through DeclareOp. 358 if (debugLevel == mlir::LLVM::DIEmissionKind::Full) { 359 // Process 'GlobalOp' only if full debug info is requested. 360 for (auto globalOp : module.getOps<fir::GlobalOp>()) 361 handleGlobalOp(globalOp, fileAttr, cuAttr, &symbolTable); 362 } 363 } 364 365 std::unique_ptr<mlir::Pass> 366 fir::createAddDebugInfoPass(fir::AddDebugInfoOptions options) { 367 return std::make_unique<AddDebugInfoPass>(options); 368 } 369