[clang] [Clang][Interp] Fix the location of uninitialized base warning (PR #100761)

[via cfe-commits]

https://github.com/yronglin created https://github.com/llvm/llvm-project/pull/100761

Fix the location of `diag::note_constexpr_uninitialized_base`, make it same as current interpreter.

>From eb237d1b6434c16366f8095f47af1456cb776a27 Mon Sep 17 00:00:00 2001
From: yronglin <yronglin777 at gmail.com>
Date: Fri, 26 Jul 2024 23:09:42 +0800
Subject: [PATCH] [Clang][Interp] Fix the location of uninitialized base
 warning

Signed-off-by: yronglin <yronglin777 at gmail.com>
---
 clang/lib/AST/Interp/EvaluationResult.cpp     | 20 +++++++++----------
 .../constexpr-subobj-initialization.cpp       | 18 +++++++----------
 .../constexpr-subobj-initialization.cpp       |  7 ++++---
 3 files changed, 20 insertions(+), 25 deletions(-)

diff --git a/clang/lib/AST/Interp/EvaluationResult.cpp b/clang/lib/AST/Interp/EvaluationResult.cpp
index 1b255711c7b36..57e12598d12e4 100644
--- a/clang/lib/AST/Interp/EvaluationResult.cpp
+++ b/clang/lib/AST/Interp/EvaluationResult.cpp
@@ -122,22 +122,20 @@ static bool CheckFieldsInitialized(InterpState &S, SourceLocation Loc,
   }
 
   // Check Fields in all bases
-  for (const Record::Base &B : R->bases()) {
+  unsigned BaseIndex = 0;
+  const CXXRecordDecl *CD = dyn_cast<CXXRecordDecl>(R->getDecl());
+  for (const CXXBaseSpecifier &BS : CD->bases()) {
+    const Record::Base &B = *R->getBase(BaseIndex);
     Pointer P = BasePtr.atField(B.Offset);
     if (!P.isInitialized()) {
-      const Descriptor *Desc = BasePtr.getDeclDesc();
-      if (Desc->asDecl())
-        S.FFDiag(BasePtr.getDeclDesc()->asDecl()->getLocation(),
-                 diag::note_constexpr_uninitialized_base)
-            << B.Desc->getType();
-      else
-        S.FFDiag(BasePtr.getDeclDesc()->asExpr()->getExprLoc(),
-                 diag::note_constexpr_uninitialized_base)
-            << B.Desc->getType();
-
+      SourceLocation TypeBeginLoc = BS.getBaseTypeLoc();
+      SourceRange Range(TypeBeginLoc, BS.getEndLoc());
+      S.FFDiag(TypeBeginLoc, diag::note_constexpr_uninitialized_base)
+          << B.Desc->getType() << Range;
       return false;
     }
     Result &= CheckFieldsInitialized(S, Loc, P, B.R);
+    BaseIndex++;
   }
 
   // TODO: Virtual bases
diff --git a/clang/test/AST/Interp/constexpr-subobj-initialization.cpp b/clang/test/AST/Interp/constexpr-subobj-initialization.cpp
index 4976b165468bd..4c067423aedfd 100644
--- a/clang/test/AST/Interp/constexpr-subobj-initialization.cpp
+++ b/clang/test/AST/Interp/constexpr-subobj-initialization.cpp
@@ -14,33 +14,29 @@ struct DelBase {
   constexpr DelBase() = delete; // expected-note {{'DelBase' has been explicitly marked deleted here}}
 };
 
-struct Foo : DelBase {
+struct Foo : DelBase { // expected-note 2{{constructor of base class 'baseclass_uninit::DelBase' is not called}}
   constexpr Foo() {}; // expected-error {{call to deleted constructor of 'DelBase'}}
 };
-constexpr Foo f; // expected-error {{must be initialized by a constant expression}} \
-                 // expected-note {{constructor of base class 'baseclass_uninit::DelBase' is not called}}
+constexpr Foo f; // expected-error {{must be initialized by a constant expression}}
 
 struct Bar : Foo {
   constexpr Bar() {};
 };
-constexpr Bar bar; // expected-error {{must be initialized by a constant expression}} \
-                   // expected-note {{constructor of base class 'baseclass_uninit::DelBase' is not called}}
+constexpr Bar bar; // expected-error {{must be initialized by a constant expression}}
 
 struct Base {};
-struct A : Base {
+struct A : Base { // expected-note {{constructor of base class 'baseclass_uninit::Base' is not called}}
   constexpr A() : value() {} // expected-error {{member initializer 'value' does not name a non-static data member or base class}}
 };
 
-constexpr A a; // expected-error {{must be initialized by a constant expression}} \
-               // expected-note {{constructor of base class 'baseclass_uninit::Base' is not called}}
+constexpr A a; // expected-error {{must be initialized by a constant expression}}
 
 
-struct B : Base {
+struct B : Base { // expected-note {{constructor of base class 'baseclass_uninit::Base' is not called}}
   constexpr B() : {} // expected-error {{expected class member or base class name}}
 };
 
-constexpr B b; // expected-error {{must be initialized by a constant expression}} \
-               // expected-note {{constructor of base class 'baseclass_uninit::Base' is not called}}
+constexpr B b; // expected-error {{must be initialized by a constant expression}}
 } // namespace baseclass_uninit
 
 
diff --git a/clang/test/SemaCXX/constexpr-subobj-initialization.cpp b/clang/test/SemaCXX/constexpr-subobj-initialization.cpp
index cd096a9270937..f0252df1e2ce1 100644
--- a/clang/test/SemaCXX/constexpr-subobj-initialization.cpp
+++ b/clang/test/SemaCXX/constexpr-subobj-initialization.cpp
@@ -1,11 +1,12 @@
 // RUN: %clang_cc1 -fsyntax-only -verify %s
+// RUN: %clang_cc1 -fsyntax-only -verify -fexperimental-new-constant-interpreter %s
 
 namespace baseclass_uninit {
 struct DelBase {
   constexpr DelBase() = delete; // expected-note {{'DelBase' has been explicitly marked deleted here}}
 };
 
-struct Foo : DelBase {  // expected-note 2{{constructor of base class 'DelBase' is not called}}
+struct Foo : DelBase {  // expected-note-re 2{{constructor of base class '{{.*}}DelBase' is not called}}
   constexpr Foo() {}; // expected-error {{call to deleted constructor of 'DelBase'}}
 };
 constexpr Foo f; // expected-error {{must be initialized by a constant expression}}
@@ -15,13 +16,13 @@ struct Bar : Foo {
 constexpr Bar bar; // expected-error {{must be initialized by a constant expression}}
 
 struct Base {};
-struct A : Base { // expected-note {{constructor of base class 'Base' is not called}}
+struct A : Base { // expected-note-re {{constructor of base class '{{.*}}Base' is not called}}
   constexpr A() : value() {} // expected-error {{member initializer 'value' does not name a non-static data member or base class}}
 };
 
 constexpr A a; // expected-error {{must be initialized by a constant expression}}
 
-struct B : Base { // expected-note {{constructor of base class 'Base' is not called}}
+struct B : Base { // expected-note-re {{constructor of base class '{{.*}}Base' is not called}}
   constexpr B() : {} // expected-error {{expected class member or base class name}}
 };