Add AST matcher support for FunctionDecls with the hasBody matcher.

Patch by Aleksei Sidorin.

llvm-svn: 258322

clang/docs/LibASTMatchersReference.html

@@ -3436,8 +3436,8 @@ with withInitializer matching (1)
 
 
 <tr><td>Matcher&lt<a href="http://clang.llvm.org/doxygen/classclang_1_1CXXForRangeStmt.html">CXXForRangeStmt</a>&gt;</td><td class="name" onclick="toggle('hasBody3')"><a name="hasBody3Anchor">hasBody</a></td><td>Matcher&lt<a href="http://clang.llvm.org/doxygen/classclang_1_1Stmt.html">Stmt</a>&gt; InnerMatcher</td></tr>
-<tr><td colspan="4" class="doc" id="hasBody3"><pre>Matches a 'for', 'while', or 'do while' statement that has
-a given body.
+<tr><td colspan="4" class="doc" id="hasBody3"><pre>Matches a 'for', 'while', 'do while' statement or a function
+definition that has a given body.
 
 Given
   for (;;) {}
@@ -3878,8 +3878,8 @@ declaration of class D.
 
 
 <tr><td>Matcher&lt<a href="http://clang.llvm.org/doxygen/classclang_1_1DoStmt.html">DoStmt</a>&gt;</td><td class="name" onclick="toggle('hasBody0')"><a name="hasBody0Anchor">hasBody</a></td><td>Matcher&lt<a href="http://clang.llvm.org/doxygen/classclang_1_1Stmt.html">Stmt</a>&gt; InnerMatcher</td></tr>
-<tr><td colspan="4" class="doc" id="hasBody0"><pre>Matches a 'for', 'while', or 'do while' statement that has
-a given body.
+<tr><td colspan="4" class="doc" id="hasBody0"><pre>Matches a 'for', 'while', 'do while' statement or a function
+definition that has a given body.
 
 Given
   for (;;) {}
@@ -4059,8 +4059,8 @@ would only match the declaration for a.
 
 
 <tr><td>Matcher&lt<a href="http://clang.llvm.org/doxygen/classclang_1_1ForStmt.html">ForStmt</a>&gt;</td><td class="name" onclick="toggle('hasBody1')"><a name="hasBody1Anchor">hasBody</a></td><td>Matcher&lt<a href="http://clang.llvm.org/doxygen/classclang_1_1Stmt.html">Stmt</a>&gt; InnerMatcher</td></tr>
-<tr><td colspan="4" class="doc" id="hasBody1"><pre>Matches a 'for', 'while', or 'do while' statement that has
-a given body.
+<tr><td colspan="4" class="doc" id="hasBody1"><pre>Matches a 'for', 'while', 'do while' statement or a function
+definition that has a given body.
 
 Given
   for (;;) {}
@@ -4114,6 +4114,19 @@ with hasAnyParameter(...)
 </pre></td></tr>
 
 
+<tr><td>Matcher&lt<a href="http://clang.llvm.org/doxygen/classclang_1_1FunctionDecl.html">FunctionDecl</a>&gt;</td><td class="name" onclick="toggle('hasBody4')"><a name="hasBody4Anchor">hasBody</a></td><td>Matcher&lt<a href="http://clang.llvm.org/doxygen/classclang_1_1Stmt.html">Stmt</a>&gt; InnerMatcher</td></tr>
+<tr><td colspan="4" class="doc" id="hasBody4"><pre>Matches a 'for', 'while', 'do while' statement or a function
+definition that has a given body.
+
+Given
+  for (;;) {}
+hasBody(compoundStmt())
+  matches 'for (;;) {}'
+with compoundStmt()
+  matching '{}'
+</pre></td></tr>
+
+
 <tr><td>Matcher&lt<a href="http://clang.llvm.org/doxygen/classclang_1_1FunctionDecl.html">FunctionDecl</a>&gt;</td><td class="name" onclick="toggle('hasParameter0')"><a name="hasParameter0Anchor">hasParameter</a></td><td>unsigned N, Matcher&lt<a href="http://clang.llvm.org/doxygen/classclang_1_1ParmVarDecl.html">ParmVarDecl</a>&gt; InnerMatcher</td></tr>
 <tr><td colspan="4" class="doc" id="hasParameter0"><pre>Matches the n'th parameter of a function declaration.
 
@@ -4891,8 +4904,8 @@ variableArrayType(hasSizeExpr(ignoringImpCasts(declRefExpr(to(
 
 
 <tr><td>Matcher&lt<a href="http://clang.llvm.org/doxygen/classclang_1_1WhileStmt.html">WhileStmt</a>&gt;</td><td class="name" onclick="toggle('hasBody2')"><a name="hasBody2Anchor">hasBody</a></td><td>Matcher&lt<a href="http://clang.llvm.org/doxygen/classclang_1_1Stmt.html">Stmt</a>&gt; InnerMatcher</td></tr>
-<tr><td colspan="4" class="doc" id="hasBody2"><pre>Matches a 'for', 'while', or 'do while' statement that has
-a given body.
+<tr><td colspan="4" class="doc" id="hasBody2"><pre>Matches a 'for', 'while', 'do while' statement or a function
+definition that has a given body.
 
 Given
   for (;;) {}

clang/include/clang/ASTMatchers/ASTMatchers.h

@@ -3189,8 +3189,8 @@ AST_MATCHER_P(ArraySubscriptExpr, hasBase,
   return false;
 }
 
-/// \brief Matches a 'for', 'while', or 'do while' statement that has
-/// a given body.
+/// \brief Matches a 'for', 'while', 'do while' statement or a function
+/// definition that has a given body.
 ///
 /// Given
 /// \code
@@ -3203,9 +3203,10 @@ AST_MATCHER_P(ArraySubscriptExpr, hasBase,
 AST_POLYMORPHIC_MATCHER_P(hasBody,
                           AST_POLYMORPHIC_SUPPORTED_TYPES(DoStmt, ForStmt,
                                                           WhileStmt,
-                                                          CXXForRangeStmt),
+                                                          CXXForRangeStmt,
+                                                          FunctionDecl),
                           internal::Matcher<Stmt>, InnerMatcher) {
-  const Stmt *const Statement = Node.getBody();
+  const Stmt *const Statement = internal::GetBodyMatcher<NodeType>::get(Node);
   return (Statement != nullptr &&
           InnerMatcher.matches(*Statement, Finder, Builder));
 }

clang/include/clang/ASTMatchers/ASTMatchersInternal.h

@@ -1584,6 +1584,18 @@ struct NotEqualsBoundNodePredicate {
   ast_type_traits::DynTypedNode Node;
 };
 
+template <typename Ty>
+struct GetBodyMatcher {
+  static const Stmt *get(const Ty &Node) {
+    return Node.getBody();
+  }
+};
+
+template <>
+inline const Stmt *GetBodyMatcher<FunctionDecl>::get(const FunctionDecl &Node) {
+  return Node.doesThisDeclarationHaveABody() ? Node.getBody() : nullptr;
+}
+
 } // end namespace internal
 } // end namespace ast_matchers
 } // end namespace clang

clang/unittests/ASTMatchers/ASTMatchersTest.cpp

@@ -2973,6 +2973,10 @@ TEST(HasBody, FindsBodyOfForWhileDoLoops) {
               doStmt(hasBody(compoundStmt()))));
   EXPECT_TRUE(matches("void f() { int p[2]; for (auto x : p) {} }",
               cxxForRangeStmt(hasBody(compoundStmt()))));
+  EXPECT_TRUE(matches("void f() {}", functionDecl(hasBody(compoundStmt()))));
+  EXPECT_TRUE(notMatches("void f();", functionDecl(hasBody(compoundStmt()))));
+  EXPECT_TRUE(matches("void f(); void f() {}",
+                         functionDecl(hasBody(compoundStmt()))));
 }
 
 TEST(HasAnySubstatement, MatchesForTopLevelCompoundStatement) {

clang/unittests/ASTMatchers/Dynamic/ParserTest.cpp

@@ -263,7 +263,7 @@ TEST(ParserTest, Errors) {
             "1:1: Matcher does not support binding.",
             ParseWithError("isArrow().bind(\"foo\")"));
   EXPECT_EQ("Input value has unresolved overloaded type: "
-            "Matcher<DoStmt|ForStmt|WhileStmt|CXXForRangeStmt>",
+            "Matcher<DoStmt|ForStmt|WhileStmt|CXXForRangeStmt|FunctionDecl>",
             ParseMatcherWithError("hasBody(stmt())"));
 }