ExternalASTSource.cpp source code [clang_source_code/lib/AST/ExternalASTSource.cpp]

1	//===- ExternalASTSource.cpp - Abstract External AST Interface ------------===//
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	// This file provides the default implementation of the ExternalASTSource
10	// interface, which enables construction of AST nodes from some external
11	// source.
12	//
13	//===----------------------------------------------------------------------===//
14
15	#include "clang/AST/ExternalASTSource.h"
16	#include "clang/AST/ASTContext.h"
17	#include "clang/AST/DeclarationName.h"
18	#include "clang/Basic/IdentifierTable.h"
19	#include "clang/Basic/LLVM.h"
20	#include "clang/Basic/Module.h"
21	#include "llvm/ADT/None.h"
22	#include "llvm/Support/ErrorHandling.h"
23	#include <cstdint>
24
25	using namespace clang;
26
27	ExternalASTSource::~ExternalASTSource() = default;
28
29	llvm::Optional<ExternalASTSource::ASTSourceDescriptor>
30	ExternalASTSource::getSourceDescriptor(unsigned ID) {
31	return None;
32	}
33
34	ExternalASTSource::ExtKind
35	ExternalASTSource::hasExternalDefinitions(const Decl *D) {
36	return EK_ReplyHazy;
37	}
38
39	ExternalASTSource::ASTSourceDescriptor::ASTSourceDescriptor(const Module &M)
40	: Signature(M.Signature), ClangModule(&M) {
41	if (M.Directory)
42	Path = M.Directory->getName();
43	if (auto *File = M.getASTFile())
44	ASTFile = File->getName();
45	}
46
47	std::string ExternalASTSource::ASTSourceDescriptor::getModuleName() const {
48	if (ClangModule)
49	return ClangModule->Name;
50	else
51	return PCHModuleName;
52	}
53
54	void ExternalASTSource::FindFileRegionDecls(FileID File, unsigned Offset,
55	unsigned Length,
56	SmallVectorImpl<Decl *> &Decls) {}
57
58	void ExternalASTSource::CompleteRedeclChain(const Decl *D) {}
59
60	void ExternalASTSource::CompleteType(TagDecl *Tag) {}
61
62	void ExternalASTSource::CompleteType(ObjCInterfaceDecl *Class) {}
63
64	void ExternalASTSource::ReadComments() {}
65
66	void ExternalASTSource::StartedDeserializing() {}
67
68	void ExternalASTSource::FinishedDeserializing() {}
69
70	void ExternalASTSource::StartTranslationUnit(ASTConsumer *Consumer) {}
71
72	void ExternalASTSource::PrintStats() {}
73
74	bool ExternalASTSource::layoutRecordType(
75	const RecordDecl *Record, uint64_t &Size, uint64_t &Alignment,
76	llvm::DenseMap<const FieldDecl *, uint64_t> &FieldOffsets,
77	llvm::DenseMap<const CXXRecordDecl *, CharUnits> &BaseOffsets,
78	llvm::DenseMap<const CXXRecordDecl *, CharUnits> &VirtualBaseOffsets) {
79	return false;
80	}
81
82	Decl *ExternalASTSource::GetExternalDecl(uint32_t ID) {
83	return nullptr;
84	}
85
86	Selector ExternalASTSource::GetExternalSelector(uint32_t ID) {
87	return Selector();
88	}
89
90	uint32_t ExternalASTSource::GetNumExternalSelectors() {
91	return 0;
92	}
93
94	Stmt *ExternalASTSource::GetExternalDeclStmt(uint64_t Offset) {
95	return nullptr;
96	}
97
98	CXXCtorInitializer **
99	ExternalASTSource::GetExternalCXXCtorInitializers(uint64_t Offset) {
100	return nullptr;
101	}
102
103	CXXBaseSpecifier *
104	ExternalASTSource::GetExternalCXXBaseSpecifiers(uint64_t Offset) {
105	return nullptr;
106	}
107
108	bool
109	ExternalASTSource::FindExternalVisibleDeclsByName(const DeclContext *DC,
110	DeclarationName Name) {
111	return false;
112	}
113
114	void ExternalASTSource::completeVisibleDeclsMap(const DeclContext *DC) {}
115
116	void ExternalASTSource::FindExternalLexicalDecls(
117	const DeclContext *DC, llvm::function_ref<bool(Decl::Kind)> IsKindWeWant,
118	SmallVectorImpl<Decl *> &Result) {}
119
120	void ExternalASTSource::getMemoryBufferSizes(MemoryBufferSizes &sizes) const {}
121
122	uint32_t ExternalASTSource::incrementGeneration(ASTContext &C) {
123	uint32_t OldGeneration = CurrentGeneration;
124
125	// Make sure the generation of the topmost external source for the context is
126	// incremented. That might not be us.
127	auto *P = C.getExternalSource();
128	if (P && P != this)
129	CurrentGeneration = P->incrementGeneration(C);
130	else {
131	// FIXME: Only bump the generation counter if the current generation number
132	// has been observed?
133	if (!++CurrentGeneration)
134	llvm::report_fatal_error("generation counter overflowed", false);
135	}
136
137	return OldGeneration;
138	}
139