Debug Info: Comment changes in r181393 by request of echristo
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@181672 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGDebugInfo.cpp b/lib/CodeGen/CGDebugInfo.cpp
index 7d5d260..13b681e 100644
--- a/lib/CodeGen/CGDebugInfo.cpp
+++ b/lib/CodeGen/CGDebugInfo.cpp
@@ -2172,8 +2172,19 @@
}
llvm::DIDescriptor CGDebugInfo::getDeclarationOrDefinition(const Decl *D) {
+ // We only need a declaration (not a definition) of the type - so use whatever
+ // we would otherwise do to get a type for a pointee. (forward declarations in
+ // limited debug info, full definitions (if the type definition is available)
+ // in unlimited debug info)
if (const TypeDecl *RD = dyn_cast<TypeDecl>(D))
return CreatePointeeType(QualType(RD->getTypeForDecl(), 0), llvm::DIFile());
+ // Otherwise fall back to a fairly rudimentary cache of existing declarations.
+ // This doesn't handle providing declarations (for functions or variables) for
+ // entities without definitions in this TU, nor when the definition proceeds
+ // the call to this function.
+ // FIXME: This should be split out into more specific maps with support for
+ // emitting forward declarations and merging definitions with declarations,
+ // the same way as we do for types.
llvm::DenseMap<const Decl *, llvm::WeakVH>::iterator I =
DeclCache.find(D->getCanonicalDecl());
if (I == DeclCache.end())
diff --git a/lib/CodeGen/CGDebugInfo.h b/lib/CodeGen/CGDebugInfo.h
index e61a50e..f221a0c 100644
--- a/lib/CodeGen/CGDebugInfo.h
+++ b/lib/CodeGen/CGDebugInfo.h
@@ -95,6 +95,8 @@
llvm::DenseMap<const char *, llvm::WeakVH> DIFileCache;
llvm::DenseMap<const FunctionDecl *, llvm::WeakVH> SPCache;
+ /// \brief Cache declarations relevant to DW_TAG_imported_declarations (C++
+ /// using declarations) that aren't covered by other more specific caches.
llvm::DenseMap<const Decl *, llvm::WeakVH> DeclCache;
llvm::DenseMap<const NamespaceDecl *, llvm::WeakVH> NameSpaceCache;
llvm::DenseMap<const Decl *, llvm::WeakVH> StaticDataMemberCache;