[PATCH] D87030: Adapt CastExpr::getSubExprAsWritten to ConstantExpr

[Stephan Bergmann via Phabricator via cfe-commits]

This revision was not accepted when it landed; it landed in state "Needs Review".
This revision was automatically updated to reflect the committed changes.
Closed by commit rG215ed9b33ccb: Adapt CastExpr::getSubExprAsWritten to ConstantExpr (authored by sberg).

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D87030/new/

https://reviews.llvm.org/D87030

Files:
  clang/lib/AST/Expr.cpp
  clang/unittests/Tooling/CastExprTest.cpp


Index: clang/unittests/Tooling/CastExprTest.cpp
===================================================================
--- clang/unittests/Tooling/CastExprTest.cpp
+++ clang/unittests/Tooling/CastExprTest.cpp
@@ -34,4 +34,24 @@
                     "S1 f(S2 s) { return static_cast<S1>(s); }\n");
 }
 
+// Verify that getSubExprAsWritten looks through a ConstantExpr in a scenario
+// like
+//
+//   CXXFunctionalCastExpr functional cast to struct S <ConstructorConversion>
+//   `-ConstantExpr 'S'
+//     |-value: Struct
+//     `-CXXConstructExpr 'S' 'void (int)'
+//       `-IntegerLiteral 'int' 0
+TEST(CastExprTest, GetSubExprAsWrittenThroughConstantExpr) {
+    CastExprVisitor Visitor;
+    Visitor.OnExplicitCast = [](ExplicitCastExpr *Expr) {
+      auto *Sub = Expr->getSubExprAsWritten();
+      EXPECT_TRUE(isa<IntegerLiteral>(Sub))
+        << "Expected IntegerLiteral, but saw " << Sub->getStmtClassName();
+    };
+    Visitor.runOver("struct S { consteval S(int) {} };\n"
+                    "S f() { return S(0); }\n",
+                    CastExprVisitor::Lang_CXX2a);
+}
+
 }
Index: clang/lib/AST/Expr.cpp
===================================================================
--- clang/lib/AST/Expr.cpp
+++ clang/lib/AST/Expr.cpp
@@ -1765,7 +1765,7 @@
     // subexpression describing the call; strip it off.
     if (E->getCastKind() == CK_ConstructorConversion)
       SubExpr =
-        skipImplicitTemporary(cast<CXXConstructExpr>(SubExpr)->getArg(0));
+        skipImplicitTemporary(cast<CXXConstructExpr>(SubExpr->IgnoreImplicit())->getArg(0));
     else if (E->getCastKind() == CK_UserDefinedConversion) {
       assert((isa<CXXMemberCallExpr>(SubExpr) ||
               isa<BlockExpr>(SubExpr)) &&


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