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