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