clang/lib/StaticAnalyzer/Frontend/ModelInjector.cpp

   1 //===-- ModelInjector.cpp ---------------------------------------*- C++ -*-===//
   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 #include "ModelInjector.h"
  10 #include "clang/AST/Decl.h"
  11 #include "clang/Basic/IdentifierTable.h"
  12 #include "clang/Basic/LangStandard.h"
  13 #include "clang/Basic/Stack.h"
  14 #include "clang/AST/DeclObjC.h"
  15 #include "clang/Frontend/ASTUnit.h"
  16 #include "clang/Frontend/CompilerInstance.h"
  17 #include "clang/Frontend/FrontendAction.h"
  18 #include "clang/Lex/Preprocessor.h"
  19 #include "clang/Serialization/ASTReader.h"
  20 #include "clang/StaticAnalyzer/Frontend/FrontendActions.h"
  21 #include "llvm/ADT/STLExtras.h"
  22 #include "llvm/Support/CrashRecoveryContext.h"
  23 #include "llvm/Support/FileSystem.h"
  24 #include <utility>
  25
  26 using namespace clang;
  27 using namespace ento;
  28
  29 ModelInjector::ModelInjector(CompilerInstance &CI) : CI(CI) {}
  30
  31 Stmt *ModelInjector::getBody(const FunctionDecl *D) {
  32   onBodySynthesis(D);
  33   return Bodies[D->getName()];
  34 }
  35
  36 Stmt *ModelInjector::getBody(const ObjCMethodDecl *D) {
  37   onBodySynthesis(D);
  38   return Bodies[D->getName()];
  39 }
  40
  41 void ModelInjector::onBodySynthesis(const NamedDecl *D) {
  42
  43   // FIXME: what about overloads? Declarations can be used as keys but what
  44   // about file name index? Mangled names may not be suitable for that either.
  45   if (Bodies.count(D->getName()) != 0)
  46     return;
  47
  48   SourceManager &SM = CI.getSourceManager();
  49   FileID mainFileID = SM.getMainFileID();
  50
  51   AnalyzerOptionsRef analyzerOpts = CI.getAnalyzerOpts();
  52   llvm::StringRef modelPath = analyzerOpts->ModelPath;
  53
  54   llvm::SmallString<128> fileName;
  55
  56   if (!modelPath.empty())
  57     fileName =
  58         llvm::StringRef(modelPath.str() + "/" + D->getName().str() + ".model");
  59   else
  60     fileName = llvm::StringRef(D->getName().str() + ".model");
  61
  62   if (!llvm::sys::fs::exists(fileName.str())) {
  63     Bodies[D->getName()] = nullptr;
  64     return;
  65   }
  66
  67   auto Invocation = std::make_shared<CompilerInvocation>(CI.getInvocation());
  68
  69   FrontendOptions &FrontendOpts = Invocation->getFrontendOpts();
  70   InputKind IK = Language::CXX; // FIXME
  71   FrontendOpts.Inputs.clear();
  72   FrontendOpts.Inputs.emplace_back(fileName, IK);
  73   FrontendOpts.DisableFree = true;
  74
  75   Invocation->getDiagnosticOpts().VerifyDiagnostics = 0;
  76
  77   // Modules are parsed by a separate CompilerInstance, so this code mimics that
  78   // behavior for models
  79   CompilerInstance Instance(CI.getPCHContainerOperations());
  80   Instance.setInvocation(std::move(Invocation));
  81   Instance.createDiagnostics(
  82       new ForwardingDiagnosticConsumer(CI.getDiagnosticClient()),
  83       /*ShouldOwnClient=*/true);
  84
  85   Instance.getDiagnostics().setSourceManager(&SM);
  86
  87   // The instance wants to take ownership, however DisableFree frontend option
  88   // is set to true to avoid double free issues
  89   Instance.setFileManager(&CI.getFileManager());
  90   Instance.setSourceManager(&SM);
  91   Instance.setPreprocessor(CI.getPreprocessorPtr());
  92   Instance.setASTContext(&CI.getASTContext());
  93
  94   Instance.getPreprocessor().InitializeForModelFile();
  95
  96   ParseModelFileAction parseModelFile(Bodies);
  97
  98   llvm::CrashRecoveryContext CRC;
  99
 100   CRC.RunSafelyOnThread([&]() { Instance.ExecuteAction(parseModelFile); },
 101                         DesiredStackSize);
 102
 103   Instance.getPreprocessor().FinalizeForModelFile();
 104
 105   Instance.resetAndLeakSourceManager();
 106   Instance.resetAndLeakFileManager();
 107   Instance.resetAndLeakPreprocessor();
 108
 109   // The preprocessor enters to the main file id when parsing is started, so
 110   // the main file id is changed to the model file during parsing and it needs
 111   // to be reset to the former main file id after parsing of the model file
 112   // is done.
 113   SM.setMainFileID(mainFileID);
 114 }