[PATCH] D72242: Fix crash on value dependent bitfields in if conditions in templates

[Elizabeth Andrews via Phabricator via cfe-commits]

eandrews updated this revision to Diff 243049.
eandrews edited the summary of this revision.
eandrews added a comment.

Thanks for taking a look Richard. This patch adds the required value-dependency check and sets type-dependency accordingly.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D72242/new/

https://reviews.llvm.org/D72242

Files:
  clang/lib/AST/Expr.cpp
  clang/test/SemaTemplate/enum-argument.cpp
  clang/test/SemaTemplate/value-dependent-bitfield-cond.cpp


Index: clang/test/SemaTemplate/value-dependent-bitfield-cond.cpp
===================================================================
--- /dev/null
+++ clang/test/SemaTemplate/value-dependent-bitfield-cond.cpp
@@ -0,0 +1,13 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+// expected-no-diagnostics
+
+template <int b>
+class A {
+  int c : b;
+
+public:
+  void f() {
+    if (c)
+      ;
+  }
+};
Index: clang/test/SemaTemplate/enum-argument.cpp
===================================================================
--- clang/test/SemaTemplate/enum-argument.cpp
+++ clang/test/SemaTemplate/enum-argument.cpp
@@ -1,4 +1,5 @@
 // RUN: %clang_cc1 -fsyntax-only -verify %s
+// expected-no-diagnostics
 
 enum Enum { val = 1 };
 template <Enum v> struct C {
@@ -30,7 +31,7 @@
     unsigned long long bitfield : e0;
 
     void f(int j) {
-      bitfield + j; // expected-warning {{expression result unused}}
+      bitfield + j;
     }
   };
 }
Index: clang/lib/AST/Expr.cpp
===================================================================
--- clang/lib/AST/Expr.cpp
+++ clang/lib/AST/Expr.cpp
@@ -1685,6 +1685,11 @@
     CXXRecordDecl *RD = dyn_cast_or_null<CXXRecordDecl>(DC);
     if (RD && RD->isDependentContext() && RD->isCurrentInstantiation(DC))
       E->setTypeDependent(T->isDependentType());
+
+    // Bitfield with value-dependent width is type-dependent.
+    FieldDecl *FD = dyn_cast<FieldDecl>(MemberDecl);
+    if (FD && FD->isBitField() && FD->getBitWidth()->isValueDependent())
+      E->setTypeDependent(true);
   }
 
   if (HasQualOrFound) {


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