1 //===-- ClangExpressionParser.cpp -------------------------------*- C++ -*-===// 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 // C Includes 11 // C++ Includes 12 // Other libraries and framework includes 13 #include "clang/AST/ASTContext.h" 14 #include "clang/AST/ExternalASTSource.h" 15 #include "clang/Basic/FileManager.h" 16 #include "clang/Basic/SourceLocation.h" 17 #include "clang/Basic/TargetInfo.h" 18 #include "clang/Basic/Version.h" 19 #include "clang/CodeGen/CodeGenAction.h" 20 #include "clang/CodeGen/ModuleBuilder.h" 21 #include "clang/Frontend/CompilerInstance.h" 22 #include "clang/Frontend/CompilerInvocation.h" 23 #include "clang/Frontend/FrontendActions.h" 24 #include "clang/Frontend/FrontendDiagnostic.h" 25 #include "clang/Frontend/FrontendPluginRegistry.h" 26 #include "clang/Frontend/TextDiagnosticBuffer.h" 27 #include "clang/Frontend/TextDiagnosticPrinter.h" 28 #include "clang/Lex/Preprocessor.h" 29 #include "clang/Parse/ParseAST.h" 30 #include "clang/Rewrite/Frontend/FrontendActions.h" 31 #include "clang/Sema/SemaConsumer.h" 32 #include "clang/StaticAnalyzer/Frontend/FrontendActions.h" 33 34 #include "llvm/ADT/StringRef.h" 35 #include "llvm/ExecutionEngine/ExecutionEngine.h" 36 #include "llvm/Support/Debug.h" 37 #include "llvm/Support/FileSystem.h" 38 #include "llvm/Support/TargetSelect.h" 39 40 #include "llvm/ExecutionEngine/MCJIT.h" 41 #include "llvm/IR/LLVMContext.h" 42 #include "llvm/IR/Module.h" 43 #include "llvm/Support/ErrorHandling.h" 44 #include "llvm/Support/MemoryBuffer.h" 45 #include "llvm/Support/DynamicLibrary.h" 46 #include "llvm/Support/Host.h" 47 #include "llvm/Support/Signals.h" 48 49 // Project includes 50 #include "ClangExpressionParser.h" 51 52 #include "ClangASTSource.h" 53 #include "ClangExpressionHelper.h" 54 #include "ClangExpressionDeclMap.h" 55 #include "ClangModulesDeclVendor.h" 56 #include "ClangPersistentVariables.h" 57 #include "IRForTarget.h" 58 59 #include "lldb/Core/ArchSpec.h" 60 #include "lldb/Core/DataBufferHeap.h" 61 #include "lldb/Core/Debugger.h" 62 #include "lldb/Core/Disassembler.h" 63 #include "lldb/Core/Log.h" 64 #include "lldb/Core/Module.h" 65 #include "lldb/Core/Stream.h" 66 #include "lldb/Core/StreamFile.h" 67 #include "lldb/Core/StringList.h" 68 #include "lldb/Core/StreamString.h" 69 #include "lldb/Expression/IRExecutionUnit.h" 70 #include "lldb/Expression/IRDynamicChecks.h" 71 #include "lldb/Expression/IRInterpreter.h" 72 #include "lldb/Host/File.h" 73 #include "lldb/Host/HostInfo.h" 74 #include "lldb/Symbol/ClangASTContext.h" 75 #include "lldb/Symbol/SymbolVendor.h" 76 #include "lldb/Target/ExecutionContext.h" 77 #include "lldb/Target/ObjCLanguageRuntime.h" 78 #include "lldb/Target/Process.h" 79 #include "lldb/Target/Target.h" 80 #include "lldb/Target/Language.h" 81 82 using namespace clang; 83 using namespace llvm; 84 using namespace lldb_private; 85 86 //===----------------------------------------------------------------------===// 87 // Utility Methods for Clang 88 //===----------------------------------------------------------------------===// 89 90 91 class ClangExpressionParser::LLDBPreprocessorCallbacks : public PPCallbacks 92 { 93 ClangModulesDeclVendor &m_decl_vendor; 94 ClangPersistentVariables &m_persistent_vars; 95 StreamString m_error_stream; 96 bool m_has_errors = false; 97 98 public: 99 LLDBPreprocessorCallbacks(ClangModulesDeclVendor &decl_vendor, 100 ClangPersistentVariables &persistent_vars) : 101 m_decl_vendor(decl_vendor), 102 m_persistent_vars(persistent_vars) 103 { 104 } 105 106 void 107 moduleImport(SourceLocation import_location, 108 clang::ModuleIdPath path, 109 const clang::Module * /*null*/) override 110 { 111 std::vector<ConstString> string_path; 112 113 for (const std::pair<IdentifierInfo *, SourceLocation> &component : path) 114 { 115 string_path.push_back(ConstString(component.first->getName())); 116 } 117 118 StreamString error_stream; 119 120 ClangModulesDeclVendor::ModuleVector exported_modules; 121 122 if (!m_decl_vendor.AddModule(string_path, &exported_modules, m_error_stream)) 123 { 124 m_has_errors = true; 125 } 126 127 for (ClangModulesDeclVendor::ModuleID module : exported_modules) 128 { 129 m_persistent_vars.AddHandLoadedClangModule(module); 130 } 131 } 132 133 bool hasErrors() 134 { 135 return m_has_errors; 136 } 137 138 const std::string &getErrorString() 139 { 140 return m_error_stream.GetString(); 141 } 142 }; 143 144 //===----------------------------------------------------------------------===// 145 // Implementation of ClangExpressionParser 146 //===----------------------------------------------------------------------===// 147 148 ClangExpressionParser::ClangExpressionParser (ExecutionContextScope *exe_scope, 149 Expression &expr, 150 bool generate_debug_info) : 151 ExpressionParser (exe_scope, expr, generate_debug_info), 152 m_compiler (), 153 m_code_generator (), 154 m_pp_callbacks(nullptr) 155 { 156 Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_EXPRESSIONS)); 157 158 // 1. Create a new compiler instance. 159 m_compiler.reset(new CompilerInstance()); 160 lldb::LanguageType frame_lang = expr.Language(); // defaults to lldb::eLanguageTypeUnknown 161 bool overridden_target_opts = false; 162 lldb_private::LanguageRuntime *lang_rt = nullptr; 163 lldb::TargetSP target_sp; 164 if (exe_scope) 165 target_sp = exe_scope->CalculateTarget(); 166 167 ArchSpec target_arch; 168 if (target_sp) 169 target_arch = target_sp->GetArchitecture(); 170 171 const auto target_machine = target_arch.GetMachine(); 172 173 // If the expression is being evaluated in the context of an existing 174 // stack frame, we introspect to see if the language runtime is available. 175 auto frame = exe_scope->CalculateStackFrame(); 176 177 // Make sure the user hasn't provided a preferred execution language 178 // with `expression --language X -- ...` 179 if (frame && frame_lang == lldb::eLanguageTypeUnknown) 180 frame_lang = frame->GetLanguage(); 181 182 if (frame_lang != lldb::eLanguageTypeUnknown) 183 { 184 lang_rt = exe_scope->CalculateProcess()->GetLanguageRuntime(frame_lang); 185 if (log) 186 log->Printf("Frame has language of type %s", Language::GetNameForLanguageType(frame_lang)); 187 } 188 189 // 2. Configure the compiler with a set of default options that are appropriate 190 // for most situations. 191 if (target_sp && target_arch.IsValid()) 192 { 193 std::string triple = target_arch.GetTriple().str(); 194 m_compiler->getTargetOpts().Triple = triple; 195 if (log) 196 log->Printf("Using %s as the target triple", m_compiler->getTargetOpts().Triple.c_str()); 197 } 198 else 199 { 200 // If we get here we don't have a valid target and just have to guess. 201 // Sometimes this will be ok to just use the host target triple (when we evaluate say "2+3", but other 202 // expressions like breakpoint conditions and other things that _are_ target specific really shouldn't just be 203 // using the host triple. In such a case the language runtime should expose an overridden options set (3), 204 // below. 205 m_compiler->getTargetOpts().Triple = llvm::sys::getDefaultTargetTriple(); 206 if (log) 207 log->Printf("Using default target triple of %s", m_compiler->getTargetOpts().Triple.c_str()); 208 } 209 // Now add some special fixes for known architectures: 210 // Any arm32 iOS environment, but not on arm64 211 if (m_compiler->getTargetOpts().Triple.find("arm64") == std::string::npos && 212 m_compiler->getTargetOpts().Triple.find("arm") != std::string::npos && 213 m_compiler->getTargetOpts().Triple.find("ios") != std::string::npos) 214 { 215 m_compiler->getTargetOpts().ABI = "apcs-gnu"; 216 } 217 // Supported subsets of x86 218 if (target_machine == llvm::Triple::x86 || 219 target_machine == llvm::Triple::x86_64) 220 { 221 m_compiler->getTargetOpts().Features.push_back("+sse"); 222 m_compiler->getTargetOpts().Features.push_back("+sse2"); 223 } 224 225 // Set the target CPU to generate code for. 226 // This will be empty for any CPU that doesn't really need to make a special CPU string. 227 m_compiler->getTargetOpts().CPU = target_arch.GetClangTargetCPU(); 228 229 // 3. Now allow the runtime to provide custom configuration options for the target. 230 // In this case, a specialized language runtime is available and we can query it for extra options. 231 // For 99% of use cases, this will not be needed and should be provided when basic platform detection is not enough. 232 if (lang_rt) 233 overridden_target_opts = lang_rt->GetOverrideExprOptions(m_compiler->getTargetOpts()); 234 235 if (overridden_target_opts) 236 if (log) 237 { 238 log->Debug("Using overridden target options for the expression evaluation"); 239 240 auto opts = m_compiler->getTargetOpts(); 241 log->Debug("Triple: '%s'", opts.Triple.c_str()); 242 log->Debug("CPU: '%s'", opts.CPU.c_str()); 243 log->Debug("FPMath: '%s'", opts.FPMath.c_str()); 244 log->Debug("ABI: '%s'", opts.ABI.c_str()); 245 log->Debug("LinkerVersion: '%s'", opts.LinkerVersion.c_str()); 246 StringList::LogDump(log, opts.FeaturesAsWritten, "FeaturesAsWritten"); 247 StringList::LogDump(log, opts.Features, "Features"); 248 StringList::LogDump(log, opts.Reciprocals, "Reciprocals"); 249 } 250 251 // 4. Create and install the target on the compiler. 252 m_compiler->createDiagnostics(); 253 auto target_info = TargetInfo::CreateTargetInfo(m_compiler->getDiagnostics(), m_compiler->getInvocation().TargetOpts); 254 if (log) 255 { 256 log->Printf("Using SIMD alignment: %d", target_info->getSimdDefaultAlign()); 257 log->Printf("Target datalayout string: '%s'", target_info->getDataLayoutString()); 258 log->Printf("Target ABI: '%s'", target_info->getABI().str().c_str()); 259 log->Printf("Target vector alignment: %d", target_info->getMaxVectorAlign()); 260 } 261 m_compiler->setTarget(target_info); 262 263 assert (m_compiler->hasTarget()); 264 265 // 5. Set language options. 266 lldb::LanguageType language = expr.Language(); 267 268 switch (language) 269 { 270 case lldb::eLanguageTypeC: 271 case lldb::eLanguageTypeC89: 272 case lldb::eLanguageTypeC99: 273 case lldb::eLanguageTypeC11: 274 // FIXME: the following language option is a temporary workaround, 275 // to "ask for C, get C++." 276 // For now, the expression parser must use C++ anytime the 277 // language is a C family language, because the expression parser 278 // uses features of C++ to capture values. 279 m_compiler->getLangOpts().CPlusPlus = true; 280 break; 281 case lldb::eLanguageTypeObjC: 282 m_compiler->getLangOpts().ObjC1 = true; 283 m_compiler->getLangOpts().ObjC2 = true; 284 // FIXME: the following language option is a temporary workaround, 285 // to "ask for ObjC, get ObjC++" (see comment above). 286 m_compiler->getLangOpts().CPlusPlus = true; 287 break; 288 case lldb::eLanguageTypeC_plus_plus: 289 case lldb::eLanguageTypeC_plus_plus_11: 290 case lldb::eLanguageTypeC_plus_plus_14: 291 m_compiler->getLangOpts().CPlusPlus11 = true; 292 m_compiler->getHeaderSearchOpts().UseLibcxx = true; 293 LLVM_FALLTHROUGH; 294 case lldb::eLanguageTypeC_plus_plus_03: 295 m_compiler->getLangOpts().CPlusPlus = true; 296 // FIXME: the following language option is a temporary workaround, 297 // to "ask for C++, get ObjC++". Apple hopes to remove this requirement 298 // on non-Apple platforms, but for now it is needed. 299 m_compiler->getLangOpts().ObjC1 = true; 300 break; 301 case lldb::eLanguageTypeObjC_plus_plus: 302 case lldb::eLanguageTypeUnknown: 303 default: 304 m_compiler->getLangOpts().ObjC1 = true; 305 m_compiler->getLangOpts().ObjC2 = true; 306 m_compiler->getLangOpts().CPlusPlus = true; 307 m_compiler->getLangOpts().CPlusPlus11 = true; 308 m_compiler->getHeaderSearchOpts().UseLibcxx = true; 309 break; 310 } 311 312 m_compiler->getLangOpts().Bool = true; 313 m_compiler->getLangOpts().WChar = true; 314 m_compiler->getLangOpts().Blocks = true; 315 m_compiler->getLangOpts().DebuggerSupport = true; // Features specifically for debugger clients 316 if (expr.DesiredResultType() == Expression::eResultTypeId) 317 m_compiler->getLangOpts().DebuggerCastResultToId = true; 318 319 m_compiler->getLangOpts().CharIsSigned = 320 ArchSpec(m_compiler->getTargetOpts().Triple.c_str()).CharIsSignedByDefault(); 321 322 // Spell checking is a nice feature, but it ends up completing a 323 // lot of types that we didn't strictly speaking need to complete. 324 // As a result, we spend a long time parsing and importing debug 325 // information. 326 m_compiler->getLangOpts().SpellChecking = false; 327 328 lldb::ProcessSP process_sp; 329 if (exe_scope) 330 process_sp = exe_scope->CalculateProcess(); 331 332 if (process_sp && m_compiler->getLangOpts().ObjC1) 333 { 334 if (process_sp->GetObjCLanguageRuntime()) 335 { 336 if (process_sp->GetObjCLanguageRuntime()->GetRuntimeVersion() == ObjCLanguageRuntime::ObjCRuntimeVersions::eAppleObjC_V2) 337 m_compiler->getLangOpts().ObjCRuntime.set(ObjCRuntime::MacOSX, VersionTuple(10, 7)); 338 else 339 m_compiler->getLangOpts().ObjCRuntime.set(ObjCRuntime::FragileMacOSX, VersionTuple(10, 7)); 340 341 if (process_sp->GetObjCLanguageRuntime()->HasNewLiteralsAndIndexing()) 342 m_compiler->getLangOpts().DebuggerObjCLiteral = true; 343 } 344 } 345 346 m_compiler->getLangOpts().ThreadsafeStatics = false; 347 m_compiler->getLangOpts().AccessControl = false; // Debuggers get universal access 348 m_compiler->getLangOpts().DollarIdents = true; // $ indicates a persistent variable name 349 350 // Set CodeGen options 351 m_compiler->getCodeGenOpts().EmitDeclMetadata = true; 352 m_compiler->getCodeGenOpts().InstrumentFunctions = false; 353 m_compiler->getCodeGenOpts().DisableFPElim = true; 354 m_compiler->getCodeGenOpts().OmitLeafFramePointer = false; 355 if (generate_debug_info) 356 m_compiler->getCodeGenOpts().setDebugInfo(codegenoptions::FullDebugInfo); 357 else 358 m_compiler->getCodeGenOpts().setDebugInfo(codegenoptions::NoDebugInfo); 359 360 // Disable some warnings. 361 m_compiler->getDiagnostics().setSeverityForGroup(clang::diag::Flavor::WarningOrError, 362 "unused-value", clang::diag::Severity::Ignored, SourceLocation()); 363 m_compiler->getDiagnostics().setSeverityForGroup(clang::diag::Flavor::WarningOrError, 364 "odr", clang::diag::Severity::Ignored, SourceLocation()); 365 366 // Inform the target of the language options 367 // 368 // FIXME: We shouldn't need to do this, the target should be immutable once 369 // created. This complexity should be lifted elsewhere. 370 m_compiler->getTarget().adjust(m_compiler->getLangOpts()); 371 372 // 6. Set up the diagnostic buffer for reporting errors 373 374 m_compiler->getDiagnostics().setClient(new clang::TextDiagnosticBuffer); 375 376 // 7. Set up the source management objects inside the compiler 377 378 clang::FileSystemOptions file_system_options; 379 m_file_manager.reset(new clang::FileManager(file_system_options)); 380 381 if (!m_compiler->hasSourceManager()) 382 m_compiler->createSourceManager(*m_file_manager.get()); 383 384 m_compiler->createFileManager(); 385 m_compiler->createPreprocessor(TU_Complete); 386 387 if (ClangModulesDeclVendor *decl_vendor = target_sp->GetClangModulesDeclVendor()) 388 { 389 ClangPersistentVariables *clang_persistent_vars = llvm::cast<ClangPersistentVariables>(target_sp->GetPersistentExpressionStateForLanguage(lldb::eLanguageTypeC)); 390 std::unique_ptr<PPCallbacks> pp_callbacks(new LLDBPreprocessorCallbacks(*decl_vendor, *clang_persistent_vars)); 391 m_pp_callbacks = static_cast<LLDBPreprocessorCallbacks*>(pp_callbacks.get()); 392 m_compiler->getPreprocessor().addPPCallbacks(std::move(pp_callbacks)); 393 } 394 395 // 8. Most of this we get from the CompilerInstance, but we 396 // also want to give the context an ExternalASTSource. 397 m_selector_table.reset(new SelectorTable()); 398 m_builtin_context.reset(new Builtin::Context()); 399 400 std::unique_ptr<clang::ASTContext> ast_context(new ASTContext(m_compiler->getLangOpts(), 401 m_compiler->getSourceManager(), 402 m_compiler->getPreprocessor().getIdentifierTable(), 403 *m_selector_table.get(), 404 *m_builtin_context.get())); 405 406 ast_context->InitBuiltinTypes(m_compiler->getTarget()); 407 408 ClangExpressionHelper *type_system_helper = dyn_cast<ClangExpressionHelper>(m_expr.GetTypeSystemHelper()); 409 ClangExpressionDeclMap *decl_map = type_system_helper->DeclMap(); 410 411 if (decl_map) 412 { 413 llvm::IntrusiveRefCntPtr<clang::ExternalASTSource> ast_source(decl_map->CreateProxy()); 414 decl_map->InstallASTContext(ast_context.get()); 415 ast_context->setExternalSource(ast_source); 416 } 417 418 m_ast_context.reset(new ClangASTContext(m_compiler->getTargetOpts().Triple.c_str())); 419 m_ast_context->setASTContext(ast_context.get()); 420 m_compiler->setASTContext(ast_context.release()); 421 422 std::string module_name("$__lldb_module"); 423 424 m_llvm_context.reset(new LLVMContext()); 425 m_code_generator.reset(CreateLLVMCodeGen(m_compiler->getDiagnostics(), 426 module_name, 427 m_compiler->getHeaderSearchOpts(), 428 m_compiler->getPreprocessorOpts(), 429 m_compiler->getCodeGenOpts(), 430 *m_llvm_context)); 431 } 432 433 ClangExpressionParser::~ClangExpressionParser() 434 { 435 } 436 437 unsigned 438 ClangExpressionParser::Parse(Stream &stream) 439 { 440 TextDiagnosticBuffer *diag_buf = static_cast<TextDiagnosticBuffer *>(m_compiler->getDiagnostics().getClient()); 441 diag_buf->FlushDiagnostics(m_compiler->getDiagnostics()); 442 443 const char *expr_text = m_expr.Text(); 444 445 clang::SourceManager &source_mgr = m_compiler->getSourceManager(); 446 bool created_main_file = false; 447 if (m_compiler->getCodeGenOpts().getDebugInfo() == codegenoptions::FullDebugInfo) 448 { 449 int temp_fd = -1; 450 llvm::SmallString<PATH_MAX> result_path; 451 FileSpec tmpdir_file_spec; 452 if (HostInfo::GetLLDBPath(lldb::ePathTypeLLDBTempSystemDir, tmpdir_file_spec)) 453 { 454 tmpdir_file_spec.AppendPathComponent("lldb-%%%%%%.expr"); 455 std::string temp_source_path = tmpdir_file_spec.GetPath(); 456 llvm::sys::fs::createUniqueFile(temp_source_path, temp_fd, result_path); 457 } 458 else 459 { 460 llvm::sys::fs::createTemporaryFile("lldb", "expr", temp_fd, result_path); 461 } 462 463 if (temp_fd != -1) 464 { 465 lldb_private::File file(temp_fd, true); 466 const size_t expr_text_len = strlen(expr_text); 467 size_t bytes_written = expr_text_len; 468 if (file.Write(expr_text, bytes_written).Success()) 469 { 470 if (bytes_written == expr_text_len) 471 { 472 file.Close(); 473 source_mgr.setMainFileID(source_mgr.createFileID(m_file_manager->getFile(result_path), 474 SourceLocation(), SrcMgr::C_User)); 475 created_main_file = true; 476 } 477 } 478 } 479 } 480 481 if (!created_main_file) 482 { 483 std::unique_ptr<MemoryBuffer> memory_buffer = MemoryBuffer::getMemBufferCopy(expr_text, __FUNCTION__); 484 source_mgr.setMainFileID(source_mgr.createFileID(std::move(memory_buffer))); 485 } 486 487 diag_buf->BeginSourceFile(m_compiler->getLangOpts(), &m_compiler->getPreprocessor()); 488 489 ClangExpressionHelper *type_system_helper = dyn_cast<ClangExpressionHelper>(m_expr.GetTypeSystemHelper()); 490 491 ASTConsumer *ast_transformer = type_system_helper->ASTTransformer(m_code_generator.get()); 492 493 if (ClangExpressionDeclMap *decl_map = type_system_helper->DeclMap()) 494 decl_map->InstallCodeGenerator(m_code_generator.get()); 495 496 if (ast_transformer) 497 { 498 ast_transformer->Initialize(m_compiler->getASTContext()); 499 ParseAST(m_compiler->getPreprocessor(), ast_transformer, m_compiler->getASTContext()); 500 } 501 else 502 { 503 m_code_generator->Initialize(m_compiler->getASTContext()); 504 ParseAST(m_compiler->getPreprocessor(), m_code_generator.get(), m_compiler->getASTContext()); 505 } 506 507 diag_buf->EndSourceFile(); 508 509 unsigned num_errors = diag_buf->getNumErrors(); 510 511 if (m_pp_callbacks && m_pp_callbacks->hasErrors()) 512 { 513 num_errors++; 514 stream.PutCString(m_pp_callbacks->getErrorString().c_str()); 515 } 516 517 for (TextDiagnosticBuffer::const_iterator warn = diag_buf->warn_begin(), warn_end = diag_buf->warn_end(); 518 warn != warn_end; ++warn) 519 stream.Printf("warning: %s\n", warn->second.c_str()); 520 521 for (TextDiagnosticBuffer::const_iterator err = diag_buf->err_begin(), err_end = diag_buf->err_end(); 522 err != err_end; ++err) 523 stream.Printf("error: %s\n", err->second.c_str()); 524 525 for (TextDiagnosticBuffer::const_iterator note = diag_buf->note_begin(), note_end = diag_buf->note_end(); 526 note != note_end; ++note) 527 stream.Printf("note: %s\n", note->second.c_str()); 528 529 if (!num_errors) 530 { 531 if (type_system_helper->DeclMap() && !type_system_helper->DeclMap()->ResolveUnknownTypes()) 532 { 533 stream.Printf("error: Couldn't infer the type of a variable\n"); 534 num_errors++; 535 } 536 } 537 538 return num_errors; 539 } 540 541 static bool FindFunctionInModule (ConstString &mangled_name, 542 llvm::Module *module, 543 const char *orig_name) 544 { 545 for (llvm::Module::iterator fi = module->getFunctionList().begin(), fe = module->getFunctionList().end(); 546 fi != fe; 547 ++fi) 548 { 549 if (fi->getName().str().find(orig_name) != std::string::npos) 550 { 551 mangled_name.SetCString(fi->getName().str().c_str()); 552 return true; 553 } 554 } 555 556 return false; 557 } 558 559 Error 560 ClangExpressionParser::PrepareForExecution (lldb::addr_t &func_addr, 561 lldb::addr_t &func_end, 562 lldb::IRExecutionUnitSP &execution_unit_sp, 563 ExecutionContext &exe_ctx, 564 bool &can_interpret, 565 ExecutionPolicy execution_policy) 566 { 567 func_addr = LLDB_INVALID_ADDRESS; 568 func_end = LLDB_INVALID_ADDRESS; 569 Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_EXPRESSIONS)); 570 571 Error err; 572 573 std::unique_ptr<llvm::Module> llvm_module_ap (m_code_generator->ReleaseModule()); 574 575 if (!llvm_module_ap.get()) 576 { 577 err.SetErrorToGenericError(); 578 err.SetErrorString("IR doesn't contain a module"); 579 return err; 580 } 581 582 // Find the actual name of the function (it's often mangled somehow) 583 584 ConstString function_name; 585 586 if (!FindFunctionInModule(function_name, llvm_module_ap.get(), m_expr.FunctionName())) 587 { 588 err.SetErrorToGenericError(); 589 err.SetErrorStringWithFormat("Couldn't find %s() in the module", m_expr.FunctionName()); 590 return err; 591 } 592 else 593 { 594 if (log) 595 log->Printf("Found function %s for %s", function_name.AsCString(), m_expr.FunctionName()); 596 } 597 598 SymbolContext sc; 599 600 if (lldb::StackFrameSP frame_sp = exe_ctx.GetFrameSP()) 601 { 602 sc = frame_sp->GetSymbolContext(lldb::eSymbolContextEverything); 603 } 604 else if (lldb::TargetSP target_sp = exe_ctx.GetTargetSP()) 605 { 606 sc.target_sp = target_sp; 607 } 608 609 execution_unit_sp.reset(new IRExecutionUnit (m_llvm_context, // handed off here 610 llvm_module_ap, // handed off here 611 function_name, 612 exe_ctx.GetTargetSP(), 613 sc, 614 m_compiler->getTargetOpts().Features)); 615 616 ClangExpressionHelper *type_system_helper = dyn_cast<ClangExpressionHelper>(m_expr.GetTypeSystemHelper()); 617 ClangExpressionDeclMap *decl_map = type_system_helper->DeclMap(); // result can be NULL 618 619 if (decl_map) 620 { 621 Stream *error_stream = NULL; 622 Target *target = exe_ctx.GetTargetPtr(); 623 if (target) 624 error_stream = target->GetDebugger().GetErrorFile().get(); 625 626 IRForTarget ir_for_target(decl_map, 627 m_expr.NeedsVariableResolution(), 628 *execution_unit_sp, 629 error_stream, 630 function_name.AsCString()); 631 632 bool ir_can_run = ir_for_target.runOnModule(*execution_unit_sp->GetModule()); 633 634 Error interpret_error; 635 Process *process = exe_ctx.GetProcessPtr(); 636 637 bool interpret_function_calls = !process ? false : process->CanInterpretFunctionCalls(); 638 can_interpret = IRInterpreter::CanInterpret(*execution_unit_sp->GetModule(), *execution_unit_sp->GetFunction(), interpret_error, interpret_function_calls); 639 640 641 if (!ir_can_run) 642 { 643 err.SetErrorString("The expression could not be prepared to run in the target"); 644 return err; 645 } 646 647 if (!can_interpret && execution_policy == eExecutionPolicyNever) 648 { 649 err.SetErrorStringWithFormat("Can't run the expression locally: %s", interpret_error.AsCString()); 650 return err; 651 } 652 653 if (!process && execution_policy == eExecutionPolicyAlways) 654 { 655 err.SetErrorString("Expression needed to run in the target, but the target can't be run"); 656 return err; 657 } 658 659 if (execution_policy == eExecutionPolicyAlways || !can_interpret) 660 { 661 if (m_expr.NeedsValidation() && process) 662 { 663 if (!process->GetDynamicCheckers()) 664 { 665 DynamicCheckerFunctions *dynamic_checkers = new DynamicCheckerFunctions(); 666 667 StreamString install_errors; 668 669 if (!dynamic_checkers->Install(install_errors, exe_ctx)) 670 { 671 if (install_errors.GetString().empty()) 672 err.SetErrorString ("couldn't install checkers, unknown error"); 673 else 674 err.SetErrorString (install_errors.GetString().c_str()); 675 676 return err; 677 } 678 679 process->SetDynamicCheckers(dynamic_checkers); 680 681 if (log) 682 log->Printf("== [ClangUserExpression::Evaluate] Finished installing dynamic checkers =="); 683 } 684 685 IRDynamicChecks ir_dynamic_checks(*process->GetDynamicCheckers(), function_name.AsCString()); 686 687 if (!ir_dynamic_checks.runOnModule(*execution_unit_sp->GetModule())) 688 { 689 err.SetErrorToGenericError(); 690 err.SetErrorString("Couldn't add dynamic checks to the expression"); 691 return err; 692 } 693 } 694 695 execution_unit_sp->GetRunnableInfo(err, func_addr, func_end); 696 } 697 } 698 else 699 { 700 execution_unit_sp->GetRunnableInfo(err, func_addr, func_end); 701 } 702 703 return err; 704 } 705