[PATCH] D86700: [SyntaxTree] Ignore leaf implicit `CXXConstructExpr`

[Eduardo Caldas via Phabricator via cfe-commits]

eduucaldas updated this revision to Diff 290260.
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Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D86700/new/

https://reviews.llvm.org/D86700

Files:
  clang/lib/Tooling/Syntax/BuildTree.cpp
  clang/unittests/Tooling/Syntax/BuildTreeTest.cpp


Index: clang/unittests/Tooling/Syntax/BuildTreeTest.cpp
===================================================================
--- clang/unittests/Tooling/Syntax/BuildTreeTest.cpp
+++ clang/unittests/Tooling/Syntax/BuildTreeTest.cpp
@@ -548,9 +548,6 @@
   struct S { };
 }
 void test() {
-  // FIXME: Remove the `UnknownExpression` wrapping `s1` and `s2`. This
-  // `UnknownExpression` comes from a leaf `CXXConstructExpr` in the
-  // ClangAST. We need to ignore leaf implicit nodes.
   [[::n::S s1]];
   [[n::S s2]];
 }
@@ -564,8 +561,7 @@
 | `-'::' ListDelimiter
 |-'S'
 `-SimpleDeclarator Declarator
-  `-UnknownExpression
-    `-'s1'
+  `-'s1'
 )txt",
        R"txt(
 SimpleDeclaration
@@ -575,8 +571,7 @@
 | `-'::' ListDelimiter
 |-'S'
 `-SimpleDeclarator Declarator
-  `-UnknownExpression
-    `-'s2'
+  `-'s2'
 )txt"}));
 }
 
@@ -608,8 +603,7 @@
 | `-'::' ListDelimiter
 |-'S'
 `-SimpleDeclarator Declarator
-  `-UnknownExpression
-    `-'s1'
+  `-'s1'
 )txt",
        R"txt(
 SimpleDeclaration
@@ -623,8 +617,7 @@
 | `-'::' ListDelimiter
 |-'S'
 `-SimpleDeclarator Declarator
-  `-UnknownExpression
-    `-'s2'
+  `-'s2'
 )txt"}));
 }
 
Index: clang/lib/Tooling/Syntax/BuildTree.cpp
===================================================================
--- clang/lib/Tooling/Syntax/BuildTree.cpp
+++ clang/lib/Tooling/Syntax/BuildTree.cpp
@@ -1132,6 +1132,14 @@
     return true;
   }
 
+  bool WalkUpFromCXXConstructExpr(CXXConstructExpr *S) {
+    // Ignore the implicit default constructs.
+    if ((S->getNumArgs() == 0 || isa<CXXDefaultArgExpr>(S->getArg(0))) &&
+        S->getParenOrBraceRange().isInvalid())
+      return true;
+    return RecursiveASTVisitor::WalkUpFromCXXConstructExpr(S);
+  }
+
   bool TraverseCXXOperatorCallExpr(CXXOperatorCallExpr *S) {
     // To construct a syntax tree of the same shape for calls to built-in and
     // user-defined operators, ignore the `DeclRefExpr` that refers to the


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