[clang][Sema] Fix the continue and break scope for while loops

Make sure we don't push the break and continue scope for a while
loop until after we have evaluated the condition.

Author: ojhunt

clang/docs/ReleaseNotes.rst

@@ -161,6 +161,8 @@ Bug Fixes in This Version
   targets that treat ``_Float16``/``__fp16`` as native scalar types. Previously
   the warning was silently lost because the operands differed only by an implicit
   cast chain. (#GH149967).
+- Correct the continue and break scope for while statements to be after the
+  condition is evaluated.
 
 Bug Fixes to Compiler Builtins
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

clang/lib/Parse/ParseStmt.cpp

@@ -1734,7 +1734,6 @@ StmtResult Parser::ParseWhileStatement(SourceLocation *TrailingElseLoc) {
                  Scope::DeclScope  | Scope::ControlScope;
   else
     ScopeFlags = Scope::BreakScope | Scope::ContinueScope;
-  ParseScope WhileScope(this, ScopeFlags);
 
   // Parse the condition.
   Sema::ConditionResult Cond;
@@ -1744,6 +1743,8 @@ StmtResult Parser::ParseWhileStatement(SourceLocation *TrailingElseLoc) {
                                 Sema::ConditionKind::Boolean, LParen, RParen))
     return StmtError();
 
+  ParseScope WhileScope(this, ScopeFlags);
+
   // OpenACC Restricts a while-loop inside of certain construct/clause
   // combinations, so diagnose that here in OpenACC mode.
   SemaOpenACC::LoopInConstructRAII LCR{getActions().OpenACC()};

clang/test/Sema/while-loop-condition-scope.c

@@ -0,0 +1,11 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s 
+
+void f() {
+  while (({ continue; 1; })) {
+    // expected-error@-1 {{'continue' statement not in loop statement}}
+
+  }
+  while (({ break; 1; })) {
+    // expected-error@-1 {{'break' statement not in loop or switch statement}}
+  }
+}