clang/unittests/Analysis/CFGBuildResult.h

   1 //===- unittests/Analysis/CFGBuildResult.h - CFG tests --------------------===//
   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 "clang/ASTMatchers/ASTMatchFinder.h"
  10 #include "clang/Analysis/CFG.h"
  11 #include "clang/Tooling/Tooling.h"
  12 #include <memory>
  13
  14 namespace clang {
  15 namespace analysis {
  16
  17 class BuildResult {
  18 public:
  19   enum Status {
  20     ToolFailed,
  21     ToolRan,
  22     SawFunctionBody,
  23     BuiltCFG,
  24   };
  25
  26   BuildResult(Status S, const FunctionDecl *Func = nullptr,
  27               std::unique_ptr<CFG> Cfg = nullptr,
  28               std::unique_ptr<ASTUnit> AST = nullptr)
  29       : S(S), Cfg(std::move(Cfg)), AST(std::move(AST)), Func(Func) {}
  30
  31   Status getStatus() const { return S; }
  32   CFG *getCFG() const { return Cfg.get(); }
  33   ASTUnit *getAST() const { return AST.get(); }
  34   const FunctionDecl *getFunc() const { return Func; }
  35
  36 private:
  37   Status S;
  38   std::unique_ptr<CFG> Cfg;
  39   std::unique_ptr<ASTUnit> AST;
  40   const FunctionDecl *Func;
  41 };
  42
  43 class CFGCallback : public ast_matchers::MatchFinder::MatchCallback {
  44 public:
  45   CFGCallback(std::unique_ptr<ASTUnit> AST) : AST(std::move(AST)) {}
  46
  47   std::unique_ptr<ASTUnit> AST;
  48   BuildResult TheBuildResult = BuildResult::ToolRan;
  49   CFG::BuildOptions Options;
  50
  51   void run(const ast_matchers::MatchFinder::MatchResult &Result) override {
  52     const auto *Func = Result.Nodes.getNodeAs<FunctionDecl>("func");
  53     Stmt *Body = Func->getBody();
  54     if (!Body)
  55       return;
  56     TheBuildResult = BuildResult::SawFunctionBody;
  57     Options.AddImplicitDtors = true;
  58     if (std::unique_ptr<CFG> Cfg =
  59             CFG::buildCFG(Func, Body, Result.Context, Options))
  60       TheBuildResult = {BuildResult::BuiltCFG, Func, std::move(Cfg),
  61                         std::move(AST)};
  62   }
  63 };
  64
  65 template <typename FuncMatcherT = ast_matchers::internal::TrueMatcher>
  66 BuildResult BuildCFG(const char *Code, CFG::BuildOptions Options = {},
  67                      FuncMatcherT FuncMatcher = ast_matchers::anything()) {
  68   std::vector<std::string> Args = {"-std=c++11",
  69                                    "-fno-delayed-template-parsing"};
  70   std::unique_ptr<ASTUnit> AST = tooling::buildASTFromCodeWithArgs(Code, Args);
  71   if (!AST)
  72     return BuildResult::ToolFailed;
  73
  74   CFGCallback Callback(std::move(AST));
  75   Callback.Options = Options;
  76   ast_matchers::MatchFinder Finder;
  77   Finder.addMatcher(ast_matchers::functionDecl(FuncMatcher).bind("func"),
  78                     &Callback);
  79
  80   Finder.matchAST(Callback.AST->getASTContext());
  81   return std::move(Callback.TheBuildResult);
  82 }
  83
  84 } // namespace analysis
  85 } // namespace clang