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/AST/DeclObjC.h"
12#include "clang/Basic/DiagnosticDriver.h"
13#include "clang/Basic/LangStandard.h"
14#include "clang/Basic/Stack.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/Support/CrashRecoveryContext.h"
22#include "llvm/Support/FileSystem.h"
23#include <utility>
24
25using namespace clang;
26using namespace ento;
27
28ModelInjector::ModelInjector(CompilerInstance &CI) : CI(CI) {
29 if (CI.getAnalyzerOpts().ShouldEmitErrorsOnInvalidConfigValue &&
30 !CI.getAnalyzerOpts().ModelPath.empty()) {
31 auto S = CI.getVirtualFileSystem().status(Path: CI.getAnalyzerOpts().ModelPath);
32 if (!S || S->getType() != llvm::sys::fs::file_type::directory_file)
33 CI.getDiagnostics().Report(DiagID: diag::err_analyzer_config_invalid_input)
34 << "model-path" << "a filename";
35 }
36}
37
38Stmt *ModelInjector::getBody(const FunctionDecl *D) {
39 onBodySynthesis(D);
40 return Bodies[D->getName()];
41}
42
43Stmt *ModelInjector::getBody(const ObjCMethodDecl *D) {
44 onBodySynthesis(D);
45 return Bodies[D->getName()];
46}
47
48void ModelInjector::onBodySynthesis(const NamedDecl *D) {
49
50 // FIXME: what about overloads? Declarations can be used as keys but what
51 // about file name index? Mangled names may not be suitable for that either.
52 if (Bodies.count(Key: D->getName()) != 0)
53 return;
54
55 llvm::IntrusiveRefCntPtr<SourceManager> SM = CI.getSourceManagerPtr();
56 FileID mainFileID = SM->getMainFileID();
57
58 llvm::StringRef modelPath = CI.getAnalyzerOpts().ModelPath;
59
60 llvm::SmallString<128> fileName;
61
62 if (!modelPath.empty())
63 fileName =
64 llvm::StringRef(modelPath.str() + "/" + D->getName().str() + ".model");
65 else
66 fileName = llvm::StringRef(D->getName().str() + ".model");
67
68 if (!CI.getVirtualFileSystem().exists(Path: fileName)) {
69 Bodies[D->getName()] = nullptr;
70 return;
71 }
72
73 auto Invocation = std::make_shared<CompilerInvocation>(args&: CI.getInvocation());
74
75 FrontendOptions &FrontendOpts = Invocation->getFrontendOpts();
76 InputKind IK = Language::CXX; // FIXME
77 FrontendOpts.Inputs.clear();
78 FrontendOpts.Inputs.emplace_back(Args&: fileName, Args&: IK);
79 FrontendOpts.DisableFree = true;
80
81 Invocation->getDiagnosticOpts().VerifyDiagnostics = 0;
82
83 // Modules are parsed by a separate CompilerInstance, so this code mimics that
84 // behavior for models
85 CompilerInstance Instance(std::move(Invocation),
86 CI.getPCHContainerOperations());
87 Instance.setVirtualFileSystem(CI.getVirtualFileSystemPtr());
88 Instance.createDiagnostics(
89 Client: new ForwardingDiagnosticConsumer(CI.getDiagnosticClient()),
90 /*ShouldOwnClient=*/true);
91
92 Instance.getDiagnostics().setSourceManager(SM.get());
93
94 // The instance wants to take ownership, however DisableFree frontend option
95 // is set to true to avoid double free issues
96 Instance.setVirtualFileSystem(CI.getVirtualFileSystemPtr());
97 Instance.setFileManager(CI.getFileManagerPtr());
98 Instance.setSourceManager(SM);
99 Instance.setPreprocessor(CI.getPreprocessorPtr());
100 Instance.setASTContext(CI.getASTContextPtr());
101
102 Instance.getPreprocessor().InitializeForModelFile();
103
104 ParseModelFileAction parseModelFile(Bodies);
105
106 llvm::CrashRecoveryContext CRC;
107
108 CRC.RunSafelyOnThread([&]() { Instance.ExecuteAction(Act&: parseModelFile); },
109 RequestedStackSize: DesiredStackSize);
110
111 Instance.getPreprocessor().FinalizeForModelFile();
112
113 Instance.resetAndLeakSourceManager();
114 Instance.resetAndLeakFileManager();
115 Instance.resetAndLeakPreprocessor();
116
117 // The preprocessor enters to the main file id when parsing is started, so
118 // the main file id is changed to the model file during parsing and it needs
119 // to be reset to the former main file id after parsing of the model file
120 // is done.
121 SM->setMainFileID(mainFileID);
122}
123