ModuleManager.h revision 98339b96a8089a6da715487e432c5abfca0ca0df 
1//===--- ModuleManager.cpp - Module Manager ---------------------*- 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//  This file defines the ModuleManager class, which manages a set of loaded
11//  modules for the ASTReader.
12//
13//===----------------------------------------------------------------------===//
14
15#ifndef LLVM_CLANG_SERIALIZATION_MODULE_MANAGER_H
16#define LLVM_CLANG_SERIALIZATION_MODULE_MANAGER_H
17
18#include "clang/Serialization/Module.h"
19#include "clang/Basic/FileManager.h"
20#include "llvm/ADT/DenseMap.h"
21
22namespace clang {
23
24namespace serialization {
25
26/// \brief Manages the set of modules loaded by an AST reader.
27class ModuleManager {
28  /// \brief The chain of AST files. The first entry is the one named by the
29  /// user, the last one is the one that doesn't depend on anything further.
30  llvm::SmallVector<Module*, 2> Chain;
31
32  /// \brief All loaded modules, indexed by name.
33  llvm::DenseMap<const FileEntry *, Module *> Modules;
34
35  /// \brief FileManager that handles translating between filenames and
36  /// FileEntry *.
37  FileManager FileMgr;
38
39  /// \brief A lookup of in-memory (virtual file) buffers
40  llvm::DenseMap<const FileEntry *, llvm::MemoryBuffer *> InMemoryBuffers;
41
42public:
43  typedef SmallVector<Module*, 2>::iterator ModuleIterator;
44  typedef SmallVector<Module*, 2>::const_iterator ModuleConstIterator;
45  typedef SmallVector<Module*, 2>::reverse_iterator ModuleReverseIterator;
46  typedef std::pair<uint32_t, StringRef> ModuleOffset;
47
48  ModuleManager(const FileSystemOptions &FSO);
49  ~ModuleManager();
50
51  /// \brief Forward iterator to traverse all loaded modules.  This is reverse
52  /// source-order.
53  ModuleIterator begin() { return Chain.begin(); }
54  /// \brief Forward iterator end-point to traverse all loaded modules
55  ModuleIterator end() { return Chain.end(); }
56
57  /// \brief Const forward iterator to traverse all loaded modules.  This is
58  /// in reverse source-order.
59  ModuleConstIterator begin() const { return Chain.begin(); }
60  /// \brief Const forward iterator end-point to traverse all loaded modules
61  ModuleConstIterator end() const { return Chain.end(); }
62
63  /// \brief Reverse iterator to traverse all loaded modules.  This is in
64  /// source order.
65  ModuleReverseIterator rbegin() { return Chain.rbegin(); }
66  /// \brief Reverse iterator end-point to traverse all loaded modules.
67  ModuleReverseIterator rend() { return Chain.rend(); }
68
69  /// \brief Returns the primary module associated with the manager, that is,
70  /// the first module loaded
71  Module &getPrimaryModule() { return *Chain[0]; }
72
73  /// \brief Returns the primary module associated with the manager, that is,
74  /// the first module loaded.
75  Module &getPrimaryModule() const { return *Chain[0]; }
76
77  /// \brief Returns the module associated with the given index
78  Module &operator[](unsigned Index) const { return *Chain[Index]; }
79
80  /// \brief Returns the module associated with the given name
81  Module *lookup(StringRef Name);
82
83  /// \brief Returns the in-memory (virtual file) buffer with the given name
84  llvm::MemoryBuffer *lookupBuffer(StringRef Name);
85
86  /// \brief Number of modules loaded
87  unsigned size() const { return Chain.size(); }
88  /// \brief Attempts to create a new module and add it to the list of known
89  /// modules.
90  ///
91  /// \param FileName The file name of the module to be loaded.
92  ///
93  /// \param Type The kind of module being loaded.
94  ///
95  /// \param ImportedBy The module that is importing this module, or NULL if
96  /// this module is imported directly by the user.
97  ///
98  /// \param ErrorStr Will be set to a non-empty string if any errors occurred
99  /// while trying to load the module.
100  ///
101  /// \return A pointer to the module that corresponds to this file name,
102  /// and a boolean indicating whether the module was newly added.
103  std::pair<Module *, bool>
104  addModule(StringRef FileName, ModuleKind Type, Module *ImportedBy,
105            std::string &ErrorStr);
106
107  /// \brief Add an in-memory buffer the list of known buffers
108  void addInMemoryBuffer(StringRef FileName, llvm::MemoryBuffer *Buffer);
109
110  /// \brief Visit each of the modules.
111  ///
112  /// This routine visits each of the modules, starting with the
113  /// "root" modules that no other loaded modules depend on, and
114  /// proceeding to the leaf modules, visiting each module only once
115  /// during the traversal.
116  ///
117  /// This traversal is intended to support various "lookup"
118  /// operations that can find data in any of the loaded modules.
119  ///
120  /// \param Visitor A visitor function that will be invoked with each
121  /// module and the given user data pointer. The return value must be
122  /// convertible to bool; when false, the visitation continues to
123  /// modules that the current module depends on. When true, the
124  /// visitation skips any modules that the current module depends on.
125  ///
126  /// \param UserData User data associated with the visitor object, which
127  /// will be passed along to the visitor.
128  void visit(bool (*Visitor)(Module &M, void *UserData), void *UserData);
129
130  /// \brief Visit each of the modules with a depth-first traversal.
131  ///
132  /// This routine visits each of the modules known to the module
133  /// manager using a depth-first search, starting with the first
134  /// loaded module. The traversal invokes the callback both before
135  /// traversing the children (preorder traversal) and after
136  /// traversing the children (postorder traversal).
137  ///
138  /// \param Visitor A visitor function that will be invoked with each
139  /// module and given a \c Preorder flag that indicates whether we're
140  /// visiting the module before or after visiting its children.  The
141  /// visitor may return true at any time to abort the depth-first
142  /// visitation.
143  ///
144  /// \param UserData User data ssociated with the visitor object,
145  /// which will be passed along to the user.
146  void visitDepthFirst(bool (*Visitor)(Module &M, bool Preorder,
147                                       void *UserData),
148                       void *UserData);
149};
150
151} } // end namespace clang::serialization
152
153#endif
154