[PATCH] D152561: [AST] Always set dependent-type for the CallExpr for error-recovery in C.

[Haojian Wu via Phabricator via cfe-commits]

hokein created this revision.
hokein added reviewers: aaron.ballman, sammccall.
Herald added a project: All.
hokein requested review of this revision.
Herald added a project: clang.

When build CallExpr for error-recovery where we have any dependent
child nodes), we should set a dependent type for CallExpr to avoid
running into some unexpected following semantic analysis.

This also aligns with the C++ behavior.

This fixes the symptom crashes: https://github.com/llvm/llvm-project/issues/50244


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D152561

Files:
  clang/lib/Sema/SemaExpr.cpp
  clang/test/AST/ast-dump-recovery.c


Index: clang/test/AST/ast-dump-recovery.c
===================================================================
--- clang/test/AST/ast-dump-recovery.c
+++ clang/test/AST/ast-dump-recovery.c
@@ -93,7 +93,7 @@
   (*__builtin_classify_type)(1);
 
   extern void ext();
-  // CHECK:     CallExpr {{.*}} 'void' contains-errors
+  // CHECK:     CallExpr {{.*}} '<dependent type>' contains-errors
   // CHECK-NEXT: |-DeclRefExpr {{.*}} 'ext'
   // CHECK-NEXT: `-RecoveryExpr {{.*}} '<dependent type>'
   ext(undef_var);
@@ -117,3 +117,12 @@
   // CHECK-NEXT: |   `-RecoveryExpr {{.*}} '<dependent type>' contains-errors
   if (__builtin_va_arg(undef, int) << 1);
 }
+
+void test6_GH50244() {
+  double array[16];
+  // CHECK:      UnaryExprOrTypeTraitExpr {{.*}} 'unsigned long' contains-errors sizeof
+  // CHECK-NEXT: `-CallExpr {{.*}} '<dependent type>' contains-errors
+  // CHECK-NEXT:   |-DeclRefExpr {{.*}} 'int ()'
+  // CHECK-NEXT:   `-RecoveryExpr {{.*}} '<dependent type>'
+  sizeof array / sizeof foo(undef);
+}
Index: clang/lib/Sema/SemaExpr.cpp
===================================================================
--- clang/lib/Sema/SemaExpr.cpp
+++ clang/lib/Sema/SemaExpr.cpp
@@ -7201,13 +7201,8 @@
             llvm::any_of(ArgExprs,
                          [](clang::Expr *E) { return E->containsErrors(); })) &&
            "should only occur in error-recovery path.");
-    QualType ReturnType =
-        llvm::isa_and_nonnull<FunctionDecl>(NDecl)
-            ? cast<FunctionDecl>(NDecl)->getCallResultType()
-            : Context.DependentTy;
-    return CallExpr::Create(Context, Fn, ArgExprs, ReturnType,
-                            Expr::getValueKindForType(ReturnType), RParenLoc,
-                            CurFPFeatureOverrides());
+    return CallExpr::Create(Context, Fn, ArgExprs, Context.DependentTy,
+                            VK_PRValue, RParenLoc, CurFPFeatureOverrides());
   }
   return BuildResolvedCallExpr(Fn, NDecl, LParenLoc, ArgExprs, RParenLoc,
                                ExecConfig, IsExecConfig);


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