[PATCH] D19871: Add an AST matcher for CastExpr kind

[Etienne Bergeron via cfe-commits]

etienneb created this revision.
etienneb added reviewers: alexfh, sbenza, klimek.
etienneb added a subscriber: cfe-commits.
Herald added a subscriber: klimek.

This AST matcher will match a given CastExpr kind.
It's an narrowing matcher on CastExpr.

http://reviews.llvm.org/D19871

Files:
  include/clang/ASTMatchers/ASTMatchers.h
  lib/ASTMatchers/Dynamic/Registry.cpp
  unittests/ASTMatchers/ASTMatchersTest.cpp

Index: unittests/ASTMatchers/ASTMatchersTest.cpp
===================================================================
--- unittests/ASTMatchers/ASTMatchersTest.cpp
+++ unittests/ASTMatchers/ASTMatchersTest.cpp
@@ -3475,6 +3475,13 @@
   EXPECT_TRUE(notMatches("int i = 0;", castExpr()));
 }
 
+TEST(CastExpression, HasCastKind) {
+  EXPECT_TRUE(matches("char *p = 0;",
+              castExpr(hasCastKind(CK_NullToPointer))));
+  EXPECT_TRUE(notMatches("char *p = 0;",
+              castExpr(hasCastKind(CK_DerivedToBase))));
+}
+
 TEST(ReinterpretCast, MatchesSimpleCase) {
   EXPECT_TRUE(matches("char* p = reinterpret_cast<char*>(&p);",
                       cxxReinterpretCastExpr()));
Index: lib/ASTMatchers/Dynamic/Registry.cpp
===================================================================
--- lib/ASTMatchers/Dynamic/Registry.cpp
+++ lib/ASTMatchers/Dynamic/Registry.cpp
@@ -75,6 +75,7 @@
   // TODO: Here is the list of the missing matchers, grouped by reason.
   //
   // Need Variant/Parser fixes:
+  // hasCastKind
   // ofKind
   //
   // Polymorphic + argument overload:
Index: include/clang/ASTMatchers/ASTMatchers.h
===================================================================
--- include/clang/ASTMatchers/ASTMatchers.h
+++ include/clang/ASTMatchers/ASTMatchers.h
@@ -3548,6 +3548,17 @@
           InnerMatcher.matches(*SubExpression, Finder, Builder));
 }
 
+/// \brief Matches casts that has a given cast kind.
+///
+/// Example: matches the implicit cast around \c 0
+/// (matcher = castExpr(hasCastKind(CK_NullToPointer)))
+/// \code
+///   int *p = 0;
+/// \endcode
+AST_MATCHER_P(CastExpr, hasCastKind, CastKind, Kind) {
+  return Node.getCastKind() == Kind;
+}
+
 /// \brief Matches casts whose destination type matches a given matcher.
 ///
 /// (Note: Clang's AST refers to other conversions as "casts" too, and calls


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