1 files changed, 99 insertions, 0 deletions
diff --git a/lldb/source/Symbol/ClangExternalASTSourceCallbacks.cpp b/lldb/source/Symbol/ClangExternalASTSourceCallbacks.cpp
new file mode 100644
index 0000000000000..c35fc585bfa56
--- /dev/null
+++ b/lldb/source/Symbol/ClangExternalASTSourceCallbacks.cpp
@@ -0,0 +1,99 @@
+//===-- ClangExternalASTSourceCallbacks.cpp ---------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "lldb/Symbol/ClangExternalASTSourceCallbacks.h"
+
+
+// Clang headers like to use NDEBUG inside of them to enable/disable debug
+// related features using "#ifndef NDEBUG" preprocessor blocks to do one thing
+// or another. This is bad because it means that if clang was built in release
+// mode, it assumes that you are building in release mode which is not always
+// the case. You can end up with functions that are defined as empty in header
+// files when NDEBUG is not defined, and this can cause link errors with the
+// clang .a files that you have since you might be missing functions in the .a
+// file. So we have to define NDEBUG when including clang headers to avoid any
+// mismatches. This is covered by rdar://problem/8691220
+
+#if !defined(NDEBUG) && !defined(LLVM_NDEBUG_OFF)
+#define LLDB_DEFINED_NDEBUG_FOR_CLANG
+#define NDEBUG
+// Need to include assert.h so it is as clang would expect it to be (disabled)
+#include <assert.h>
+#endif
+
+#include "clang/AST/DeclBase.h"
+#include "clang/AST/DeclarationName.h"
+
+#ifdef LLDB_DEFINED_NDEBUG_FOR_CLANG
+#undef NDEBUG
+#undef LLDB_DEFINED_NDEBUG_FOR_CLANG
+// Need to re-include assert.h so it is as _we_ would expect it to be (enabled)
+#include <assert.h>
+#endif
+
+#include "lldb/Utility/Log.h"
+#include "clang/AST/Decl.h"
+
+using namespace clang;
+using namespace lldb_private;
+
+bool ClangExternalASTSourceCallbacks::FindExternalVisibleDeclsByName(
+    const clang::DeclContext *decl_ctx,
+    clang::DeclarationName clang_decl_name) {
+  if (m_callback_find_by_name) {
+    llvm::SmallVector<clang::NamedDecl *, 3> results;
+
+    m_callback_find_by_name(m_callback_baton, decl_ctx, clang_decl_name,
+                            &results);
+
+    SetExternalVisibleDeclsForName(decl_ctx, clang_decl_name, results);
+
+    return (results.size() != 0);
+  }
+
+  std::string decl_name(clang_decl_name.getAsString());
+  SetNoExternalVisibleDeclsForName(decl_ctx, clang_decl_name);
+  return false;
+}
+
+void ClangExternalASTSourceCallbacks::CompleteType(TagDecl *tag_decl) {
+  if (m_callback_tag_decl)
+    m_callback_tag_decl(m_callback_baton, tag_decl);
+}
+
+void ClangExternalASTSourceCallbacks::CompleteType(
+    ObjCInterfaceDecl *objc_decl) {
+  if (m_callback_objc_decl)
+    m_callback_objc_decl(m_callback_baton, objc_decl);
+}
+
+bool ClangExternalASTSourceCallbacks::layoutRecordType(
+    const clang::RecordDecl *Record, uint64_t &Size, uint64_t &Alignment,
+    llvm::DenseMap<const clang::FieldDecl *, uint64_t> &FieldOffsets,
+    llvm::DenseMap<const clang::CXXRecordDecl *, clang::CharUnits> &BaseOffsets,
+    llvm::DenseMap<const clang::CXXRecordDecl *, clang::CharUnits>
+        &VirtualBaseOffsets) {
+  if (m_callback_layout_record_type)
+    return m_callback_layout_record_type(m_callback_baton, Record, Size,
+                                         Alignment, FieldOffsets, BaseOffsets,
+                                         VirtualBaseOffsets);
+
+  return false;
+}
+
+void ClangExternalASTSourceCallbacks::FindExternalLexicalDecls(
+    const clang::DeclContext *decl_ctx,
+    llvm::function_ref<bool(clang::Decl::Kind)> IsKindWeWant,
+    llvm::SmallVectorImpl<clang::Decl *> &decls) {
+  if (m_callback_tag_decl && decl_ctx) {
+    clang::TagDecl *tag_decl = llvm::dyn_cast<clang::TagDecl>(
+        const_cast<clang::DeclContext *>(decl_ctx));
+    if (tag_decl)
+      CompleteType(tag_decl);
+  }
+}