RecordDecl:
- Added method 'isForwardDeclaration', a predicate method that returns true
if a RecordDecl represents a forward declaration.
- Added method 'getDefinitionDecl', a query method that returns a pointer to
the RecordDecl that provides the actual definition of a struct/union.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@55642 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/clang/AST/Decl.h b/include/clang/AST/Decl.h
index eda74f3..28d7a57 100644
--- a/include/clang/AST/Decl.h
+++ b/include/clang/AST/Decl.h
@@ -802,6 +802,7 @@
/// (i.e., all forward declarations appear first in the chain). Note that
/// one should make no other assumption about the order of the RecordDecl's
/// within this chain with respect to the original source.
+ /// NOTE: This is *not* an owning reference.
RecordDecl* NextDecl;
/// Members/NumMembers - This is a new[]'d array of pointers to Decls.
@@ -821,6 +822,18 @@
virtual void Destroy(ASTContext& C);
+ /// isForwardDeclaration - Returns true if this RecordDecl represents a
+ /// forward declaration.
+ bool isForwardDeclaration() const {
+ assert ((!Members || NextDecl == 0) && "(Members != 0) => (NextDecl == 0)");
+ return !Members;
+ }
+
+ /// getDefinitionDecl - Returns the RecordDecl for the struct/union that
+ /// represents the actual definition (i.e., not a forward declaration).
+ /// This method returns NULL if no such RecordDecl exists.
+ const RecordDecl* getDefinitionDecl() const;
+
bool hasFlexibleArrayMember() const { return HasFlexibleArrayMember; }
void setHasFlexibleArrayMember(bool V) { HasFlexibleArrayMember = V; }
diff --git a/lib/AST/Decl.cpp b/lib/AST/Decl.cpp
index c2ae5d9..4b4aa65 100644
--- a/lib/AST/Decl.cpp
+++ b/lib/AST/Decl.cpp
@@ -160,6 +160,18 @@
return new (Mem) RecordDecl(DK, DC, L, Id, PrevDecl);
}
+/// getDefinitionDecl - Returns the RecordDecl for the struct/union that
+/// represents the actual definition (i.e., not a forward declaration).
+/// This method returns NULL if no such RecordDecl exists.
+const RecordDecl* RecordDecl::getDefinitionDecl() const {
+ const RecordDecl* R = this;
+
+ for (RecordDecl* N = R->NextDecl; N; N = R->NextDecl)
+ R = N;
+
+ return R->Members ? R : 0;
+}
+
FileScopeAsmDecl *FileScopeAsmDecl::Create(ASTContext &C,
SourceLocation L,