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