1//===-- ModelInjector.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#include "ModelInjector.h"
11#include "clang/AST/Decl.h"
12#include "clang/Basic/IdentifierTable.h"
13#include "clang/Frontend/ASTUnit.h"
14#include "clang/Frontend/CompilerInstance.h"
15#include "clang/Frontend/FrontendAction.h"
16#include "clang/Lex/Preprocessor.h"
17#include "clang/Serialization/ASTReader.h"
18#include "clang/StaticAnalyzer/Frontend/FrontendActions.h"
19#include "llvm/ADT/STLExtras.h"
20#include "llvm/Support/CrashRecoveryContext.h"
21#include "llvm/Support/FileSystem.h"
22#include <string>
23#include <utility>
24
25using namespace clang;
26using namespace ento;
27
28ModelInjector::ModelInjector(CompilerInstance &CI) : CI(CI) {}
29
30Stmt *ModelInjector::getBody(const FunctionDecl *D) {
31  onBodySynthesis(D);
32  return Bodies[D->getName()];
33}
34
35Stmt *ModelInjector::getBody(const ObjCMethodDecl *D) {
36  onBodySynthesis(D);
37  return Bodies[D->getName()];
38}
39
40void ModelInjector::onBodySynthesis(const NamedDecl *D) {
41
42  // FIXME: what about overloads? Declarations can be used as keys but what
43  // about file name index? Mangled names may not be suitable for that either.
44  if (Bodies.count(D->getName()) != 0)
45    return;
46
47  SourceManager &SM = CI.getSourceManager();
48  FileID mainFileID = SM.getMainFileID();
49
50  AnalyzerOptionsRef analyzerOpts = CI.getAnalyzerOpts();
51  llvm::StringRef modelPath = analyzerOpts->Config["model-path"];
52
53  llvm::SmallString<128> fileName;
54
55  if (!modelPath.empty())
56    fileName =
57        llvm::StringRef(modelPath.str() + "/" + D->getName().str() + ".model");
58  else
59    fileName = llvm::StringRef(D->getName().str() + ".model");
60
61  if (!llvm::sys::fs::exists(fileName.str())) {
62    Bodies[D->getName()] = nullptr;
63    return;
64  }
65
66  IntrusiveRefCntPtr<CompilerInvocation> Invocation(
67      new CompilerInvocation(CI.getInvocation()));
68
69  FrontendOptions &FrontendOpts = Invocation->getFrontendOpts();
70  InputKind IK = IK_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(&*Invocation);
81  Instance.createDiagnostics(
82      new ForwardingDiagnosticConsumer(CI.getDiagnosticClient()),
83      /*ShouldOwnClient=*/true);
84
85  Instance.getDiagnostics().setSourceManager(&SM);
86
87  Instance.setVirtualFileSystem(&CI.getVirtualFileSystem());
88
89  // The instance wants to take ownership, however DisableFree frontend option
90  // is set to true to avoid double free issues
91  Instance.setFileManager(&CI.getFileManager());
92  Instance.setSourceManager(&SM);
93  Instance.setPreprocessor(&CI.getPreprocessor());
94  Instance.setASTContext(&CI.getASTContext());
95
96  Instance.getPreprocessor().InitializeForModelFile();
97
98  ParseModelFileAction parseModelFile(Bodies);
99
100  const unsigned ThreadStackSize = 8 << 20;
101  llvm::CrashRecoveryContext CRC;
102
103  CRC.RunSafelyOnThread([&]() { Instance.ExecuteAction(parseModelFile); },
104                        ThreadStackSize);
105
106  Instance.getPreprocessor().FinalizeForModelFile();
107
108  Instance.resetAndLeakSourceManager();
109  Instance.resetAndLeakFileManager();
110  Instance.resetAndLeakPreprocessor();
111
112  // The preprocessor enters to the main file id when parsing is started, so
113  // the main file id is changed to the model file during parsing and it needs
114  // to be reseted to the former main file id after parsing of the model file
115  // is done.
116  SM.setMainFileID(mainFileID);
117}
118