[clang] [clang] Sequence C++20 Parenthesized List Init (PR #83476)

[Douglas Deslauriers via cfe-commits]

https://github.com/vapdrs updated https://github.com/llvm/llvm-project/pull/83476

>From 85958bdf181b0cb79716a35bc4f3248e8f31c527 Mon Sep 17 00:00:00 2001
From: Douglas Deslauriers <Douglas.Deslauriers at vector.com>
Date: Thu, 29 Feb 2024 20:18:34 +0000
Subject: [PATCH] [clang] Sequence C++20 Parenthesized List Init

Parenthesized list intializers are sequenced operations, see C++20
[decl.init]p16.5 and [decl.init]p16.6.2.2 for more details.

Fixes #83474
---
 clang/lib/Sema/SemaChecking.cpp               | 29 +++++++++----------
 .../warn-unsequenced-paren-list-init.cpp      | 15 ++++++++++
 2 files changed, 28 insertions(+), 16 deletions(-)
 create mode 100644 clang/test/SemaCXX/warn-unsequenced-paren-list-init.cpp

diff --git a/clang/lib/Sema/SemaChecking.cpp b/clang/lib/Sema/SemaChecking.cpp
index 016e9830662042..4a120a7e310819 100644
--- a/clang/lib/Sema/SemaChecking.cpp
+++ b/clang/lib/Sema/SemaChecking.cpp
@@ -17589,20 +17589,7 @@ class SequenceChecker : public ConstEvaluatedExprVisitor<SequenceChecker> {
       return VisitExpr(CCE);
 
     // In C++11, list initializations are sequenced.
-    SmallVector<SequenceTree::Seq, 32> Elts;
-    SequenceTree::Seq Parent = Region;
-    for (CXXConstructExpr::const_arg_iterator I = CCE->arg_begin(),
-                                              E = CCE->arg_end();
-         I != E; ++I) {
-      Region = Tree.allocate(Parent);
-      Elts.push_back(Region);
-      Visit(*I);
-    }
-
-    // Forget that the initializers are sequenced.
-    Region = Parent;
-    for (unsigned I = 0; I < Elts.size(); ++I)
-      Tree.merge(Elts[I]);
+    SequenceExpressionsInOrder({CCE->getArgs(), CCE->getNumArgs()});
   }
 
   void VisitInitListExpr(const InitListExpr *ILE) {
@@ -17610,10 +17597,20 @@ class SequenceChecker : public ConstEvaluatedExprVisitor<SequenceChecker> {
       return VisitExpr(ILE);
 
     // In C++11, list initializations are sequenced.
+    SequenceExpressionsInOrder(ILE->inits());
+  }
+
+  void VisitCXXParenListInitExpr(const CXXParenListInitExpr *PLIE) {
+    // C++20 parenthesized list initializations are sequenced. See C++20
+    // [decl.init.general]p16.5 and [decl.init.general]p16.6.2.2.
+    SequenceExpressionsInOrder(PLIE->getInitExprs());
+  }
+
+private:
+  void SequenceExpressionsInOrder(ArrayRef<const Expr *> ExpressionList) {
     SmallVector<SequenceTree::Seq, 32> Elts;
     SequenceTree::Seq Parent = Region;
-    for (unsigned I = 0; I < ILE->getNumInits(); ++I) {
-      const Expr *E = ILE->getInit(I);
+    for (const Expr *E : ExpressionList) {
       if (!E)
         continue;
       Region = Tree.allocate(Parent);
diff --git a/clang/test/SemaCXX/warn-unsequenced-paren-list-init.cpp b/clang/test/SemaCXX/warn-unsequenced-paren-list-init.cpp
new file mode 100644
index 00000000000000..5aeeb45f81e226
--- /dev/null
+++ b/clang/test/SemaCXX/warn-unsequenced-paren-list-init.cpp
@@ -0,0 +1,15 @@
+// RUN: %clang_cc1 -fsyntax-only -std=c++20 -Wno-unused -Wunsequenced -verify %s
+
+struct A {
+  int x, y;
+};
+
+void test() {
+  int a = 0;
+
+  A agg1( a++, a++ ); // no warning
+  A agg2( a++ + a, a++ ); // expected-warning {{unsequenced modification and access to 'a'}}
+
+  int arr1[]( a++, a++ ); // no warning
+  int arr2[]( a++ + a, a++ ); // expected-warning {{unsequenced modification and access to 'a'}}
+}