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 
12 #include <string>
13 #include <utility>
14 
15 #include "clang/Frontend/ASTUnit.h"
16 #include "clang/Frontend/CompilerInstance.h"
17 #include "clang/Frontend/FrontendAction.h"
18 #include "clang/StaticAnalyzer/Frontend/FrontendActions.h"
19 #include "clang/Serialization/ASTReader.h"
20 #include "clang/Basic/IdentifierTable.h"
21 #include "clang/AST/Decl.h"
22 #include "clang/Lex/Preprocessor.h"
23 #include "llvm/Support/CrashRecoveryContext.h"
24 #include "llvm/Support/FileSystem.h"
25 #include "llvm/ADT/STLExtras.h"
26 
27 using namespace clang;
28 using namespace ento;
29 
30 ModelInjector::ModelInjector(CompilerInstance &CI) : CI(CI) {}
31 
32 Stmt *ModelInjector::getBody(const FunctionDecl *D) {
33   onBodySynthesis(D);
34   return Bodies[D->getName()];
35 }
36 
37 Stmt *ModelInjector::getBody(const ObjCMethodDecl *D) {
38   onBodySynthesis(D);
39   return Bodies[D->getName()];
40 }
41 
42 void ModelInjector::onBodySynthesis(const NamedDecl *D) {
43 
44   // FIXME: what about overloads? Declarations can be used as keys but what
45   // about file name index? Mangled names may not be suitable for that either.
46   if (Bodies.count(D->getName()) != 0)
47     return;
48 
49   SourceManager &SM = CI.getSourceManager();
50   FileID mainFileID = SM.getMainFileID();
51 
52   AnalyzerOptionsRef analyzerOpts = CI.getAnalyzerOpts();
53   llvm::StringRef modelPath = analyzerOpts->Config["model-path"];
54 
55   llvm::SmallString<128> fileName;
56 
57   if (!modelPath.empty())
58     fileName =
59         llvm::StringRef(modelPath.str() + "/" + D->getName().str() + ".model");
60   else
61     fileName = llvm::StringRef(D->getName().str() + ".model");
62 
63   if (!llvm::sys::fs::exists(fileName.str())) {
64     Bodies[D->getName()] = nullptr;
65     return;
66   }
67 
68   IntrusiveRefCntPtr<CompilerInvocation> Invocation(
69       new CompilerInvocation(CI.getInvocation()));
70 
71   FrontendOptions &FrontendOpts = Invocation->getFrontendOpts();
72   InputKind IK = IK_CXX; // FIXME
73   FrontendOpts.Inputs.clear();
74   FrontendOpts.Inputs.push_back(FrontendInputFile(fileName, IK));
75   FrontendOpts.DisableFree = true;
76 
77   Invocation->getDiagnosticOpts().VerifyDiagnostics = 0;
78 
79   // Modules are parsed by a separate CompilerInstance, so this code mimics that
80   // behavior for models
81   CompilerInstance Instance;
82   Instance.setInvocation(&*Invocation);
83   Instance.createDiagnostics(
84       new ForwardingDiagnosticConsumer(CI.getDiagnosticClient()),
85       /*ShouldOwnClient=*/true);
86 
87   Instance.getDiagnostics().setSourceManager(&SM);
88 
89   Instance.setVirtualFileSystem(&CI.getVirtualFileSystem());
90 
91   // The instance wants to take ownership, however DisableFree frontend option
92   // is set to true to avoid double free issues
93   Instance.setFileManager(&CI.getFileManager());
94   Instance.setSourceManager(&SM);
95   Instance.setPreprocessor(&CI.getPreprocessor());
96   Instance.setASTContext(&CI.getASTContext());
97 
98   Instance.getPreprocessor().InitializeForModelFile();
99 
100   ParseModelFileAction parseModelFile(Bodies);
101 
102   const unsigned ThreadStackSize = 8 << 20;
103   llvm::CrashRecoveryContext CRC;
104 
105   CRC.RunSafelyOnThread([&]() { Instance.ExecuteAction(parseModelFile); },
106                         ThreadStackSize);
107 
108   Instance.getPreprocessor().FinalizeForModelFile();
109 
110   Instance.resetAndLeakSourceManager();
111   Instance.resetAndLeakFileManager();
112   Instance.resetAndLeakPreprocessor();
113 
114   // The preprocessor enters to the main file id when parsing is started, so
115   // the main file id is changed to the model file during parsing and it needs
116   // to be reseted to the former main file id after parsing of the model file
117   // is done.
118   SM.setMainFileID(mainFileID);
119 }
120