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
26using namespace clang;
27using namespace ento;
28
29ModelInjector::ModelInjector(CompilerInstance &CI) : CI(CI) {}
30
31Stmt *ModelInjector::getBody(const FunctionDecl *D) {
32  onBodySynthesis(D);
33  return Bodies[D->getName()];
34}
35
36Stmt *ModelInjector::getBody(const ObjCMethodDecl *D) {
37  onBodySynthesis(D);
38  return Bodies[D->getName()];
39}
40
41void 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}
115