Diagnose invalid uses of tagged types with a missing tag. For example, in:
struct xyz { int y; };
enum abc { ZZZ };
static xyz b;
abc c;
we used to produce:
t2.c:4:8: error: unknown type name 'xyz'
static xyz b;
^
t2.c:5:1: error: unknown type name 'abc'
abc c;
^
we now produce:
t2.c:4:8: error: use of tagged type 'xyz' without 'struct' tag
static xyz b;
^
struct
t2.c:5:1: error: use of tagged type 'abc' without 'enum' tag
abc c;
^
enum
GCC produces the normal:
t2.c:4: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘b’
t2.c:5: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘c’
rdar://6783347
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@68914 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaDecl.cpp b/lib/Sema/SemaDecl.cpp
index 603b8b3..8ce624b 100644
--- a/lib/Sema/SemaDecl.cpp
+++ b/lib/Sema/SemaDecl.cpp
@@ -139,6 +139,29 @@
return 0;
}
+/// isTagName() - This method is called *for error recovery purposes only*
+/// to determine if the specified name is a valid tag name ("struct foo"). If
+/// so, this returns the TST for the tag corresponding to it (TST_enum,
+/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C
+/// where the user forgot to specify the tag.
+DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) {
+ // Do a tag name lookup in this scope.
+ LookupResult R = LookupName(S, &II, LookupTagName, false, false);
+ if (R.getKind() == LookupResult::Found)
+ if (const TagDecl *TD = dyn_cast<TagDecl>(R.getAsDecl())) {
+ switch (TD->getTagKind()) {
+ case TagDecl::TK_struct: return DeclSpec::TST_struct;
+ case TagDecl::TK_union: return DeclSpec::TST_union;
+ case TagDecl::TK_class: return DeclSpec::TST_class;
+ case TagDecl::TK_enum: return DeclSpec::TST_enum;
+ }
+ }
+
+ return DeclSpec::TST_unspecified;
+}
+
+
+
DeclContext *Sema::getContainingDC(DeclContext *DC) {
if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(DC)) {
// A C++ out-of-line method will return to the file declaration context.