[PATCH] D25992: [RecursiveASTVisitor] Visit the implicit expression of a CXXDefaultArgExpr

[Malcolm Parsons via cfe-commits]

malcolm.parsons created this revision.
malcolm.parsons added reviewers: klimek, jdennett, alexfh.
malcolm.parsons added a subscriber: cfe-commits.

The matcher
varDecl(hasDescendant(

  callExpr(hasDeclaration(functionDecl(unless(isNoThrow()))))))

didn't match calls from default arguments because the expression
for a CXXDefaultArgExpr was not visited.


https://reviews.llvm.org/D25992

Files:
  include/clang/AST/RecursiveASTVisitor.h
  unittests/Tooling/RecursiveASTVisitorTest.cpp


Index: unittests/Tooling/RecursiveASTVisitorTest.cpp
===================================================================
--- unittests/Tooling/RecursiveASTVisitorTest.cpp
+++ unittests/Tooling/RecursiveASTVisitorTest.cpp
@@ -152,4 +152,21 @@
                       "};\n"));
 }
 
+// Check to ensure that implicit default argument expressions are visited.
+class IntegerLiteralVisitor
+    : public ExpectedLocationVisitor<IntegerLiteralVisitor> {
+public:
+  bool VisitIntegerLiteral(const IntegerLiteral *IL) {
+    Match("literal", IL->getLocation());
+    return true;
+  }
+};
+
+TEST(RecursiveASTVisitor, DefaultArgumentsAreVisited) {
+  IntegerLiteralVisitor Visitor;
+  Visitor.ExpectMatch("literal", 1, 15, 2);
+  EXPECT_TRUE(Visitor.runOver("int f(int i = 1);\n"
+                              "static int k = f();\n"));
+}
+
 } // end anonymous namespace
Index: include/clang/AST/RecursiveASTVisitor.h
===================================================================
--- include/clang/AST/RecursiveASTVisitor.h
+++ include/clang/AST/RecursiveASTVisitor.h
@@ -2354,7 +2354,10 @@
 })
 DEF_TRAVERSE_STMT(CXXBindTemporaryExpr, {})
 DEF_TRAVERSE_STMT(CXXBoolLiteralExpr, {})
-DEF_TRAVERSE_STMT(CXXDefaultArgExpr, {})
+DEF_TRAVERSE_STMT(CXXDefaultArgExpr, {
+  if (getDerived().shouldVisitImplicitCode())
+    TRY_TO(TraverseStmt(S->getExpr()));
+})
 DEF_TRAVERSE_STMT(CXXDefaultInitExpr, {})
 DEF_TRAVERSE_STMT(CXXDeleteExpr, {})
 DEF_TRAVERSE_STMT(ExprWithCleanups, {})


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