1 //===-- ClangExternalASTSourceCallbacks.cpp ---------------------*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "lldb/Symbol/ClangExternalASTSourceCallbacks.h"
11 
12 // C Includes
13 // C++ Includes
14 // Other libraries and framework includes
15 
16 // Clang headers like to use NDEBUG inside of them to enable/disable debug
17 // related features using "#ifndef NDEBUG" preprocessor blocks to do one thing
18 // or another. This is bad because it means that if clang was built in release
19 // mode, it assumes that you are building in release mode which is not always
20 // the case. You can end up with functions that are defined as empty in header
21 // files when NDEBUG is not defined, and this can cause link errors with the
22 // clang .a files that you have since you might be missing functions in the .a
23 // file. So we have to define NDEBUG when including clang headers to avoid any
24 // mismatches. This is covered by rdar://problem/8691220
25 
26 #if !defined(NDEBUG) && !defined(LLVM_NDEBUG_OFF)
27 #define LLDB_DEFINED_NDEBUG_FOR_CLANG
28 #define NDEBUG
29 // Need to include assert.h so it is as clang would expect it to be (disabled)
30 #include <assert.h>
31 #endif
32 
33 #include "clang/AST/DeclBase.h"
34 #include "clang/AST/DeclarationName.h"
35 
36 #ifdef LLDB_DEFINED_NDEBUG_FOR_CLANG
37 #undef NDEBUG
38 #undef LLDB_DEFINED_NDEBUG_FOR_CLANG
39 // Need to re-include assert.h so it is as _we_ would expect it to be (enabled)
40 #include <assert.h>
41 #endif
42 
43 #include "lldb/Utility/Log.h"
44 #include "clang/AST/Decl.h"
45 
46 using namespace clang;
47 using namespace lldb_private;
48 
49 bool ClangExternalASTSourceCallbacks::FindExternalVisibleDeclsByName(
50     const clang::DeclContext *decl_ctx,
51     clang::DeclarationName clang_decl_name) {
52   if (m_callback_find_by_name) {
53     llvm::SmallVector<clang::NamedDecl *, 3> results;
54 
55     m_callback_find_by_name(m_callback_baton, decl_ctx, clang_decl_name,
56                             &results);
57 
58     SetExternalVisibleDeclsForName(decl_ctx, clang_decl_name, results);
59 
60     return (results.size() != 0);
61   }
62 
63   std::string decl_name(clang_decl_name.getAsString());
64   SetNoExternalVisibleDeclsForName(decl_ctx, clang_decl_name);
65   return false;
66 }
67 
68 void ClangExternalASTSourceCallbacks::CompleteType(TagDecl *tag_decl) {
69   if (m_callback_tag_decl)
70     m_callback_tag_decl(m_callback_baton, tag_decl);
71 }
72 
73 void ClangExternalASTSourceCallbacks::CompleteType(
74     ObjCInterfaceDecl *objc_decl) {
75   if (m_callback_objc_decl)
76     m_callback_objc_decl(m_callback_baton, objc_decl);
77 }
78 
79 bool ClangExternalASTSourceCallbacks::layoutRecordType(
80     const clang::RecordDecl *Record, uint64_t &Size, uint64_t &Alignment,
81     llvm::DenseMap<const clang::FieldDecl *, uint64_t> &FieldOffsets,
82     llvm::DenseMap<const clang::CXXRecordDecl *, clang::CharUnits> &BaseOffsets,
83     llvm::DenseMap<const clang::CXXRecordDecl *, clang::CharUnits>
84         &VirtualBaseOffsets) {
85   if (m_callback_layout_record_type)
86     return m_callback_layout_record_type(m_callback_baton, Record, Size,
87                                          Alignment, FieldOffsets, BaseOffsets,
88                                          VirtualBaseOffsets);
89 
90   return false;
91 }
92 
93 void ClangExternalASTSourceCallbacks::FindExternalLexicalDecls(
94     const clang::DeclContext *decl_ctx,
95     llvm::function_ref<bool(clang::Decl::Kind)> IsKindWeWant,
96     llvm::SmallVectorImpl<clang::Decl *> &decls) {
97   if (m_callback_tag_decl && decl_ctx) {
98     clang::TagDecl *tag_decl = llvm::dyn_cast<clang::TagDecl>(
99         const_cast<clang::DeclContext *>(decl_ctx));
100     if (tag_decl)
101       CompleteType(tag_decl);
102   }
103 }
104