1 //===-- TypeSymbolTable.cpp - Implement the TypeSymbolTable class ---------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the TypeSymbolTable class for the VMCore library.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/TypeSymbolTable.h"
15 #include "llvm/DerivedTypes.h"
16 #include "llvm/ADT/StringExtras.h"
17 #include "llvm/Support/ManagedStatic.h"
18 #include "llvm/Support/Streams.h"
19 #include "llvm/Support/Threading.h"
20 #include "llvm/System/RWMutex.h"
24 #define DEBUG_SYMBOL_TABLE 0
25 #define DEBUG_ABSTYPE 0
27 static ManagedStatic<sys::RWMutex> TypeSymbolTableLock;
29 TypeSymbolTable::~TypeSymbolTable() {
30 // Drop all abstract type references in the type plane...
31 for (iterator TI = tmap.begin(), TE = tmap.end(); TI != TE; ++TI) {
32 if (TI->second->isAbstract()) // If abstract, drop the reference...
33 cast<DerivedType>(TI->second)->removeAbstractTypeUser(this);
37 std::string TypeSymbolTable::getUniqueName(const std::string &BaseName) const {
38 std::string TryName = BaseName;
40 if (llvm_is_multithreaded()) TypeSymbolTableLock->reader_acquire();
42 const_iterator End = tmap.end();
44 // See if the name exists
45 while (tmap.find(TryName) != End) // Loop until we find a free
46 TryName = BaseName + utostr(++LastUnique); // name in the symbol table
48 if (llvm_is_multithreaded()) TypeSymbolTableLock->reader_release();
53 // lookup a type by name - returns null on failure
54 Type* TypeSymbolTable::lookup(const std::string& Name) const {
55 if (llvm_is_multithreaded()) TypeSymbolTableLock->reader_acquire();
57 const_iterator TI = tmap.find(Name);
60 result = const_cast<Type*>(TI->second);
62 if (llvm_is_multithreaded()) TypeSymbolTableLock->reader_release();
67 // remove - Remove a type from the symbol table...
68 Type* TypeSymbolTable::remove(iterator Entry) {
69 if (llvm_is_multithreaded()) TypeSymbolTableLock->writer_acquire();
71 assert(Entry != tmap.end() && "Invalid entry to remove!");
72 const Type* Result = Entry->second;
74 #if DEBUG_SYMBOL_TABLE
76 cerr << " Removing Value: " << Result->getName() << "\n";
81 if (llvm_is_multithreaded()) TypeSymbolTableLock->writer_release();
83 // If we are removing an abstract type, remove the symbol table from it's use
85 if (Result->isAbstract()) {
87 cerr << "Removing abstract type from symtab"
88 << Result->getDescription()
91 cast<DerivedType>(Result)->removeAbstractTypeUser(this);
94 return const_cast<Type*>(Result);
98 // insert - Insert a type into the symbol table with the specified name...
99 void TypeSymbolTable::insert(const std::string& Name, const Type* T) {
100 assert(T && "Can't insert null type into symbol table!");
102 if (llvm_is_multithreaded()) TypeSymbolTableLock->writer_acquire();
104 if (tmap.insert(make_pair(Name, T)).second) {
105 // Type inserted fine with no conflict.
107 #if DEBUG_SYMBOL_TABLE
109 cerr << " Inserted type: " << Name << ": " << T->getDescription() << "\n";
112 // If there is a name conflict...
114 // Check to see if there is a naming conflict. If so, rename this type!
115 std::string UniqueName = Name;
117 UniqueName = getUniqueName(Name);
119 #if DEBUG_SYMBOL_TABLE
121 cerr << " Inserting type: " << UniqueName << ": "
122 << T->getDescription() << "\n";
125 // Insert the tmap entry
126 tmap.insert(make_pair(UniqueName, T));
129 if (llvm_is_multithreaded()) TypeSymbolTableLock->writer_release();
131 // If we are adding an abstract type, add the symbol table to it's use list.
132 if (T->isAbstract()) {
133 cast<DerivedType>(T)->addAbstractTypeUser(this);
135 cerr << "Added abstract type to ST: " << T->getDescription() << "\n";
140 // This function is called when one of the types in the type plane are refined
141 void TypeSymbolTable::refineAbstractType(const DerivedType *OldType,
142 const Type *NewType) {
143 if (llvm_is_multithreaded()) TypeSymbolTableLock->reader_acquire();
145 // Loop over all of the types in the symbol table, replacing any references
146 // to OldType with references to NewType. Note that there may be multiple
147 // occurrences, and although we only need to remove one at a time, it's
148 // faster to remove them all in one pass.
150 for (iterator I = begin(), E = end(); I != E; ++I) {
151 if (I->second == (Type*)OldType) { // FIXME when Types aren't const.
153 cerr << "Removing type " << OldType->getDescription() << "\n";
155 OldType->removeAbstractTypeUser(this);
157 I->second = (Type*)NewType; // TODO FIXME when types aren't const
158 if (NewType->isAbstract()) {
160 cerr << "Added type " << NewType->getDescription() << "\n";
162 cast<DerivedType>(NewType)->addAbstractTypeUser(this);
167 if (llvm_is_multithreaded()) TypeSymbolTableLock->reader_release();
171 // Handle situation where type becomes Concreate from Abstract
172 void TypeSymbolTable::typeBecameConcrete(const DerivedType *AbsTy) {
173 // Loop over all of the types in the symbol table, dropping any abstract
174 // type user entries for AbsTy which occur because there are names for the
176 if (llvm_is_multithreaded()) TypeSymbolTableLock->reader_acquire();
177 for (iterator TI = begin(), TE = end(); TI != TE; ++TI)
178 if (TI->second == const_cast<Type*>(static_cast<const Type*>(AbsTy)))
179 AbsTy->removeAbstractTypeUser(this);
180 if (llvm_is_multithreaded()) TypeSymbolTableLock->reader_release();
183 static void DumpTypes(const std::pair<const std::string, const Type*>& T ) {
184 cerr << " '" << T.first << "' = ";
189 void TypeSymbolTable::dump() const {
190 cerr << "TypeSymbolPlane: ";
191 if (llvm_is_multithreaded()) TypeSymbolTableLock->reader_acquire();
192 for_each(tmap.begin(), tmap.end(), DumpTypes);
193 if (llvm_is_multithreaded()) TypeSymbolTableLock->reader_release();