[clang] 6a079df - [ASTMatchers] Add forCallable(), a generalization of forFunction().

Artem Dergachev via cfe-commits cfe-commits at lists.llvm.org
Thu May 13 11:25:11 PDT 2021


Author: Artem Dergachev
Date: 2021-05-13T11:25:00-07:00
New Revision: 6a079dfdc992706408f2bde84c48bf76e52c4311

URL: https://github.com/llvm/llvm-project/commit/6a079dfdc992706408f2bde84c48bf76e52c4311
DIFF: https://github.com/llvm/llvm-project/commit/6a079dfdc992706408f2bde84c48bf76e52c4311.diff

LOG: [ASTMatchers] Add forCallable(), a generalization of forFunction().

The new matcher additionally covers blocks and Objective-C methods.

This matcher actually makes sure that the statement truly belongs
to that declaration's body. forFunction() incorrectly reported that
a statement in a nested block belonged to the surrounding function.

forFunction() is now deprecated due to the above footgun, in favor of
forCallable(functionDecl()) when only functions need to be considered.

Differential Revision: https://reviews.llvm.org/D102213

Added: 
    

Modified: 
    clang/docs/LibASTMatchersReference.html
    clang/include/clang/ASTMatchers/ASTMatchers.h
    clang/lib/ASTMatchers/Dynamic/Registry.cpp
    clang/unittests/ASTMatchers/ASTMatchersTraversalTest.cpp

Removed: 
    


################################################################################
diff  --git a/clang/docs/LibASTMatchersReference.html b/clang/docs/LibASTMatchersReference.html
index 9c5a1229a77f0..73309fb081f96 100644
--- a/clang/docs/LibASTMatchersReference.html
+++ b/clang/docs/LibASTMatchersReference.html
@@ -8813,9 +8813,41 @@ <h2 id="traversal-matchers">AST Traversal Matchers</h2>
 </pre></td></tr>
 
 
+<tr><td>Matcher<<a href="https://clang.llvm.org/doxygen/classclang_1_1Stmt.html">Stmt</a>></td><td class="name" onclick="toggle('forCallable0')"><a name="forCallable0Anchor">forCallable</a></td><td>Matcher<<a href="https://clang.llvm.org/doxygen/classclang_1_1Decl.html">Decl</a>> InnerMatcher</td></tr>
+<tr><td colspan="4" class="doc" id="forCallable0"><pre>Matches declaration of the function, method, or block the statement
+belongs to.
+
+Given:
+F& operator=(const F& o) {
+  std::copy_if(o.begin(), o.end(), begin(), [](V v) { return v > 0; });
+  return *this;
+}
+returnStmt(forCallable(functionDecl(hasName("operator="))))
+  matches 'return *this'
+  but does not match 'return v > 0'
+
+Given:
+-(void) foo {
+  int x = 1;
+  dispatch_sync(queue, ^{ int y = 2; });
+}
+declStmt(forCallable(objcMethodDecl()))
+  matches 'int x = 1'
+  but does not match 'int y = 2'.
+whereas declStmt(forCallable(blockDecl()))
+  matches 'int y = 2'
+  but does not match 'int x = 1'.
+</pre></td></tr>
+
+
 <tr><td>Matcher<<a href="https://clang.llvm.org/doxygen/classclang_1_1Stmt.html">Stmt</a>></td><td class="name" onclick="toggle('forFunction0')"><a name="forFunction0Anchor">forFunction</a></td><td>Matcher<<a href="https://clang.llvm.org/doxygen/classclang_1_1FunctionDecl.html">FunctionDecl</a>> InnerMatcher</td></tr>
 <tr><td colspan="4" class="doc" id="forFunction0"><pre>Matches declaration of the function the statement belongs to.
 
+Deprecated. Use forCallable() to correctly handle the situation when
+the declaration is not a function (but a block or an Objective-C method).
+forFunction() not only fails to take non-functions into account but also
+may match the wrong declaration in their presence.
+
 Given:
 F& operator=(const F& o) {
   std::copy_if(o.begin(), o.end(), begin(), [](V v) { return v > 0; });

diff  --git a/clang/include/clang/ASTMatchers/ASTMatchers.h b/clang/include/clang/ASTMatchers/ASTMatchers.h
index 32d094d5e753d..b3c43458fce7c 100644
--- a/clang/include/clang/ASTMatchers/ASTMatchers.h
+++ b/clang/include/clang/ASTMatchers/ASTMatchers.h
@@ -7545,6 +7545,11 @@ AST_MATCHER_P(DecompositionDecl, hasAnyBinding, internal::Matcher<BindingDecl>,
 
 /// Matches declaration of the function the statement belongs to.
 ///
+/// Deprecated. Use forCallable() to correctly handle the situation when
+/// the declaration is not a function (but a block or an Objective-C method).
+/// forFunction() not only fails to take non-functions into account but also
+/// may match the wrong declaration in their presence.
+///
 /// Given:
 /// \code
 /// F& operator=(const F& o) {
@@ -7580,6 +7585,65 @@ AST_MATCHER_P(Stmt, forFunction, internal::Matcher<FunctionDecl>,
   return false;
 }
 
+/// Matches declaration of the function, method, or block the statement
+/// belongs to.
+///
+/// Given:
+/// \code
+/// F& operator=(const F& o) {
+///   std::copy_if(o.begin(), o.end(), begin(), [](V v) { return v > 0; });
+///   return *this;
+/// }
+/// \endcode
+/// returnStmt(forCallable(functionDecl(hasName("operator="))))
+///   matches 'return *this'
+///   but does not match 'return v > 0'
+///
+/// Given:
+/// \code
+/// -(void) foo {
+///   int x = 1;
+///   dispatch_sync(queue, ^{ int y = 2; });
+/// }
+/// \endcode
+/// declStmt(forCallable(objcMethodDecl()))
+///   matches 'int x = 1'
+///   but does not match 'int y = 2'.
+/// whereas declStmt(forCallable(blockDecl()))
+///   matches 'int y = 2'
+///   but does not match 'int x = 1'.
+AST_MATCHER_P(Stmt, forCallable, internal::Matcher<Decl>, InnerMatcher) {
+  const auto &Parents = Finder->getASTContext().getParents(Node);
+
+  llvm::SmallVector<DynTypedNode, 8> Stack(Parents.begin(), Parents.end());
+  while (!Stack.empty()) {
+    const auto &CurNode = Stack.back();
+    Stack.pop_back();
+    if (const auto *FuncDeclNode = CurNode.get<FunctionDecl>()) {
+      if (InnerMatcher.matches(*FuncDeclNode, Finder, Builder)) {
+        return true;
+      }
+    } else if (const auto *LambdaExprNode = CurNode.get<LambdaExpr>()) {
+      if (InnerMatcher.matches(*LambdaExprNode->getCallOperator(), Finder,
+                               Builder)) {
+        return true;
+      }
+    } else if (const auto *ObjCMethodDeclNode = CurNode.get<ObjCMethodDecl>()) {
+      if (InnerMatcher.matches(*ObjCMethodDeclNode, Finder, Builder)) {
+        return true;
+      }
+    } else if (const auto *BlockDeclNode = CurNode.get<BlockDecl>()) {
+      if (InnerMatcher.matches(*BlockDeclNode, Finder, Builder)) {
+        return true;
+      }
+    } else {
+      for (const auto &Parent : Finder->getASTContext().getParents(CurNode))
+        Stack.push_back(Parent);
+    }
+  }
+  return false;
+}
+
 /// Matches a declaration that has external formal linkage.
 ///
 /// Example matches only z (matcher = varDecl(hasExternalFormalLinkage()))

diff  --git a/clang/lib/ASTMatchers/Dynamic/Registry.cpp b/clang/lib/ASTMatchers/Dynamic/Registry.cpp
index 8c0f688b54417..31b4f601faf47 100644
--- a/clang/lib/ASTMatchers/Dynamic/Registry.cpp
+++ b/clang/lib/ASTMatchers/Dynamic/Registry.cpp
@@ -236,6 +236,7 @@ RegistryMaps::RegistryMaps() {
   REGISTER_MATCHER(fieldDecl);
   REGISTER_MATCHER(fixedPointLiteral);
   REGISTER_MATCHER(floatLiteral);
+  REGISTER_MATCHER(forCallable);
   REGISTER_MATCHER(forDecomposition);
   REGISTER_MATCHER(forEach);
   REGISTER_MATCHER(forEachArgumentWithParam);

diff  --git a/clang/unittests/ASTMatchers/ASTMatchersTraversalTest.cpp b/clang/unittests/ASTMatchers/ASTMatchersTraversalTest.cpp
index bcee21f9220a2..ae496d39e00cf 100644
--- a/clang/unittests/ASTMatchers/ASTMatchersTraversalTest.cpp
+++ b/clang/unittests/ASTMatchers/ASTMatchersTraversalTest.cpp
@@ -5524,6 +5524,83 @@ TEST(StatementMatcher, ForFunction) {
   EXPECT_TRUE(notMatches(CppString2, returnStmt(forFunction(hasName("F")))));
 }
 
+TEST(StatementMatcher, ForCallable) {
+  // These tests are copied over from the forFunction() test above.
+  StringRef CppString1 = "struct PosVec {"
+                         "  PosVec& operator=(const PosVec&) {"
+                         "    auto x = [] { return 1; };"
+                         "    return *this;"
+                         "  }"
+                         "};";
+  StringRef CppString2 = "void F() {"
+                         "  struct S {"
+                         "    void F2() {"
+                         "       return;"
+                         "    }"
+                         "  };"
+                         "}";
+
+  EXPECT_TRUE(
+    matches(
+      CppString1,
+      returnStmt(forCallable(functionDecl(hasName("operator="))),
+                 has(unaryOperator(hasOperatorName("*"))))));
+  EXPECT_TRUE(
+    notMatches(
+      CppString1,
+      returnStmt(forCallable(functionDecl(hasName("operator="))),
+                 has(integerLiteral()))));
+  EXPECT_TRUE(
+    matches(
+      CppString1,
+      returnStmt(forCallable(functionDecl(hasName("operator()"))),
+                 has(integerLiteral()))));
+  EXPECT_TRUE(matches(CppString2,
+                      returnStmt(forCallable(functionDecl(hasName("F2"))))));
+  EXPECT_TRUE(notMatches(CppString2,
+                         returnStmt(forCallable(functionDecl(hasName("F"))))));
+
+  // These tests are specific to forCallable().
+  StringRef ObjCString1 = "@interface I"
+                          "-(void) foo;"
+                          "@end"
+                          "@implementation I"
+                          "-(void) foo {"
+                          "  void (^block)() = ^{ 0x2b | ~0x2b; };"
+                          "}"
+                          "@end";
+
+  EXPECT_TRUE(
+    matchesObjC(
+      ObjCString1,
+      binaryOperator(forCallable(blockDecl()))));
+
+  EXPECT_TRUE(
+    notMatchesObjC(
+      ObjCString1,
+      binaryOperator(forCallable(objcMethodDecl()))));
+
+  StringRef ObjCString2 = "@interface I"
+                          "-(void) foo;"
+                          "@end"
+                          "@implementation I"
+                          "-(void) foo {"
+                          "  0x2b | ~0x2b;"
+                          "  void (^block)() = ^{};"
+                          "}"
+                          "@end";
+
+  EXPECT_TRUE(
+    matchesObjC(
+      ObjCString2,
+      binaryOperator(forCallable(objcMethodDecl()))));
+
+  EXPECT_TRUE(
+    notMatchesObjC(
+      ObjCString2,
+      binaryOperator(forCallable(blockDecl()))));
+}
+
 TEST(Matcher, ForEachOverriden) {
   const auto ForEachOverriddenInClass = [](const char *ClassName) {
     return cxxMethodDecl(ofClass(hasName(ClassName)), isVirtual(),


        


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