Adds the possibility to run ASTMatchFinder over arbitrary AST nodes.

llvm-svn: 166567

clang/include/clang/ASTMatchers/ASTMatchFinder.h

@@ -123,6 +123,13 @@ public:
   /// \brief Creates a clang ASTConsumer that finds all matches.
   clang::ASTConsumer *newASTConsumer();
 
+  /// \brief Finds all matches on the given \c Node.
+  ///
+  /// @{
+  void findAll(const Decl &Node, ASTContext &Context);
+  void findAll(const Stmt &Node, ASTContext &Context);
+  /// @}
+
   /// \brief Registers a callback to notify the end of parsing.
   ///
   /// The provided closure is called after parsing is done, before the AST is

clang/lib/ASTMatchers/ASTMatchFinder.cpp

@@ -667,6 +667,18 @@ ASTConsumer *MatchFinder::newASTConsumer() {
   return new internal::MatchASTConsumer(&MatcherCallbackPairs, ParsingDone);
 }
 
+void MatchFinder::findAll(const Decl &Node, ASTContext &Context) {
+  internal::MatchASTVisitor Visitor(&MatcherCallbackPairs);
+  Visitor.set_active_ast_context(&Context);
+  Visitor.TraverseDecl(const_cast<Decl*>(&Node));
+}
+
+void MatchFinder::findAll(const Stmt &Node, ASTContext &Context) {
+  internal::MatchASTVisitor Visitor(&MatcherCallbackPairs);
+  Visitor.set_active_ast_context(&Context);
+  Visitor.TraverseStmt(const_cast<Stmt*>(&Node));
+}
+
 void MatchFinder::registerTestCallbackAfterParsing(
     MatchFinder::ParsingDoneTestCallback *NewParsingDone) {
   ParsingDone = NewParsingDone;

clang/unittests/ASTMatchers/ASTMatchersTest.cpp

@@ -3171,5 +3171,42 @@ TEST(NNS, MatchesNestedNameSpecifierPrefixes) {
           specifiesTypeLoc(loc(qualType(asString("struct A"))))))));
 }
 
+template <typename T>
+class VerifyRecursiveMatch : public BoundNodesCallback {
+public:
+  explicit VerifyRecursiveMatch(StringRef Id,
+                                const internal::Matcher<T> &InnerMatcher)
+      : Id(Id), InnerMatcher(InnerMatcher) {}
+  virtual bool run(const BoundNodes *Nodes, ASTContext *Context) {
+    const T *Node = Nodes->getNodeAs<T>(Id);
+    bool Found = false;
+    MatchFinder Finder;
+    Finder.addMatcher(InnerMatcher, new VerifyMatch(0, &Found));
+    Finder.findAll(*Node, *Context);
+    return Found;
+  }
+private:
+  std::string Id;
+  internal::Matcher<T> InnerMatcher;
+};
+
+TEST(MatchFinder, CanMatchDeclarationsRecursively) {
+  EXPECT_TRUE(matchAndVerifyResultTrue("class X { class Y {}; };",
+    recordDecl(hasName("::X")).bind("X"),
+    new VerifyRecursiveMatch<clang::Decl>("X", recordDecl(hasName("X::Y")))));
+  EXPECT_TRUE(matchAndVerifyResultFalse("class X { class Y {}; };",
+    recordDecl(hasName("::X")).bind("X"),
+    new VerifyRecursiveMatch<clang::Decl>("X", recordDecl(hasName("X::Z")))));
+}
+
+TEST(MatchFinder, CanMatchStatementsRecursively) {
+  EXPECT_TRUE(matchAndVerifyResultTrue("void f() { if (1) { for (;;) { } } }",
+    ifStmt().bind("if"),
+    new VerifyRecursiveMatch<clang::Stmt>("if", forStmt())));
+  EXPECT_TRUE(matchAndVerifyResultFalse("void f() { if (1) { for (;;) { } } }",
+    ifStmt().bind("if"),
+    new VerifyRecursiveMatch<clang::Stmt>("if", declStmt())));
+}
+
 } // end namespace ast_matchers
 } // end namespace clang

clang/unittests/ASTMatchers/ASTMatchersTest.h

@@ -24,7 +24,10 @@ using clang::tooling::FrontendActionFactory;
 class BoundNodesCallback {
 public:
   virtual ~BoundNodesCallback() {}
-  virtual bool run(const BoundNodes *BoundNodes) = 0;
+  virtual bool run(const BoundNodes *BoundNodes) { return false; }
+  virtual bool run(const BoundNodes *BoundNodes, ASTContext *Context) {
+    return run(BoundNodes);
+  }
 };
 
 // If 'FindResultVerifier' is not NULL, sets *Verified to the result of
@@ -37,7 +40,7 @@ public:
 
   virtual void run(const MatchFinder::MatchResult &Result) {
     if (FindResultReviewer != NULL) {
-      *Verified = FindResultReviewer->run(&Result.Nodes);
+      *Verified = FindResultReviewer->run(&Result.Nodes, Result.Context);
     } else {
       *Verified = true;
     }