1 //===-- ClangExternalASTSourceCallbacks.cpp -------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "Plugins/ExpressionParser/Clang/ClangExternalASTSourceCallbacks.h"
10 #include "Plugins/TypeSystem/Clang/TypeSystemClang.h"
11 
12 #include "clang/AST/Decl.h"
13 #include "clang/AST/DeclObjC.h"
14 #include "clang/Basic/Module.h"
15 #include <optional>
16 
17 using namespace lldb_private;
18 
19 char ClangExternalASTSourceCallbacks::ID;
20 
21 void ClangExternalASTSourceCallbacks::CompleteType(clang::TagDecl *tag_decl) {
22   m_ast.CompleteTagDecl(tag_decl);
23 }
24 
25 void ClangExternalASTSourceCallbacks::CompleteType(
26     clang::ObjCInterfaceDecl *objc_decl) {
27   m_ast.CompleteObjCInterfaceDecl(objc_decl);
28 }
29 
30 bool ClangExternalASTSourceCallbacks::layoutRecordType(
31     const clang::RecordDecl *Record, uint64_t &Size, uint64_t &Alignment,
32     llvm::DenseMap<const clang::FieldDecl *, uint64_t> &FieldOffsets,
33     llvm::DenseMap<const clang::CXXRecordDecl *, clang::CharUnits> &BaseOffsets,
34     llvm::DenseMap<const clang::CXXRecordDecl *, clang::CharUnits>
35         &VirtualBaseOffsets) {
36   return m_ast.LayoutRecordType(Record, Size, Alignment, FieldOffsets,
37                                 BaseOffsets, VirtualBaseOffsets);
38 }
39 
40 void ClangExternalASTSourceCallbacks::FindExternalLexicalDecls(
41     const clang::DeclContext *decl_ctx,
42     llvm::function_ref<bool(clang::Decl::Kind)> IsKindWeWant,
43     llvm::SmallVectorImpl<clang::Decl *> &decls) {
44   if (decl_ctx) {
45     clang::TagDecl *tag_decl = llvm::dyn_cast<clang::TagDecl>(
46         const_cast<clang::DeclContext *>(decl_ctx));
47     if (tag_decl)
48       CompleteType(tag_decl);
49   }
50 }
51 
52 bool ClangExternalASTSourceCallbacks::FindExternalVisibleDeclsByName(
53     const clang::DeclContext *DC, clang::DeclarationName Name) {
54   llvm::SmallVector<clang::NamedDecl *, 4> decls;
55   // Objective-C methods are not added into the LookupPtr when they originate
56   // from an external source. SetExternalVisibleDeclsForName() adds them.
57   if (auto *oid = llvm::dyn_cast<clang::ObjCInterfaceDecl>(DC)) {
58     clang::ObjCContainerDecl::method_range noload_methods(oid->noload_decls());
59     for (auto *omd : noload_methods)
60       if (omd->getDeclName() == Name)
61         decls.push_back(omd);
62   }
63   return !SetExternalVisibleDeclsForName(DC, Name, decls).empty();
64 }
65 
66 OptionalClangModuleID
67 ClangExternalASTSourceCallbacks::RegisterModule(clang::Module *module) {
68   m_modules.push_back(module);
69   unsigned id = m_modules.size();
70   m_ids.insert({module, id});
71   return OptionalClangModuleID(id);
72 }
73 
74 std::optional<clang::ASTSourceDescriptor>
75 ClangExternalASTSourceCallbacks::getSourceDescriptor(unsigned id) {
76   if (clang::Module *module = getModule(id))
77     return {*module};
78   return {};
79 }
80 
81 clang::Module *ClangExternalASTSourceCallbacks::getModule(unsigned id) {
82   if (id && id <= m_modules.size())
83     return m_modules[id - 1];
84   return nullptr;
85 }
86 
87 OptionalClangModuleID
88 ClangExternalASTSourceCallbacks::GetIDForModule(clang::Module *module) {
89   return OptionalClangModuleID(m_ids[module]);
90 }
91