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/System/RWMutex.h"
20 #include "llvm/System/Threading.h"
24 #define DEBUG_SYMBOL_TABLE 0
25 #define DEBUG_ABSTYPE 0
27 static ManagedStatic<sys::SmartRWMutex<true> > 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 sys::SmartScopedReader<true> Reader(*TypeSymbolTableLock);
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
50 // lookup a type by name - returns null on failure
51 Type* TypeSymbolTable::lookup(const std::string& Name) const {
52 sys::SmartScopedReader<true> Reader(*TypeSymbolTableLock);
54 const_iterator TI = tmap.find(Name);
57 result = const_cast<Type*>(TI->second);
61 // remove - Remove a type from the symbol table...
62 Type* TypeSymbolTable::remove(iterator Entry) {
63 TypeSymbolTableLock->writer_acquire();
65 assert(Entry != tmap.end() && "Invalid entry to remove!");
66 const Type* Result = Entry->second;
68 #if DEBUG_SYMBOL_TABLE
70 cerr << " Removing Value: " << Result->getName() << "\n";
75 TypeSymbolTableLock->writer_release();
77 // If we are removing an abstract type, remove the symbol table from it's use
79 if (Result->isAbstract()) {
81 cerr << "Removing abstract type from symtab"
82 << Result->getDescription()
85 cast<DerivedType>(Result)->removeAbstractTypeUser(this);
88 return const_cast<Type*>(Result);
92 // insert - Insert a type into the symbol table with the specified name...
93 void TypeSymbolTable::insert(const std::string& Name, const Type* T) {
94 assert(T && "Can't insert null type into symbol table!");
96 TypeSymbolTableLock->writer_acquire();
98 if (tmap.insert(make_pair(Name, T)).second) {
99 // Type inserted fine with no conflict.
101 #if DEBUG_SYMBOL_TABLE
103 cerr << " Inserted type: " << Name << ": " << T->getDescription() << "\n";
106 // If there is a name conflict...
108 // Check to see if there is a naming conflict. If so, rename this type!
109 std::string UniqueName = Name;
111 UniqueName = getUniqueName(Name);
113 #if DEBUG_SYMBOL_TABLE
115 cerr << " Inserting type: " << UniqueName << ": "
116 << T->getDescription() << "\n";
119 // Insert the tmap entry
120 tmap.insert(make_pair(UniqueName, T));
123 TypeSymbolTableLock->writer_release();
125 // If we are adding an abstract type, add the symbol table to it's use list.
126 if (T->isAbstract()) {
127 cast<DerivedType>(T)->addAbstractTypeUser(this);
129 cerr << "Added abstract type to ST: " << T->getDescription() << "\n";
134 // This function is called when one of the types in the type plane are refined
135 void TypeSymbolTable::refineAbstractType(const DerivedType *OldType,
136 const Type *NewType) {
137 sys::SmartScopedReader<true> Reader(*TypeSymbolTableLock);
139 // Loop over all of the types in the symbol table, replacing any references
140 // to OldType with references to NewType. Note that there may be multiple
141 // occurrences, and although we only need to remove one at a time, it's
142 // faster to remove them all in one pass.
144 for (iterator I = begin(), E = end(); I != E; ++I) {
145 if (I->second == (Type*)OldType) { // FIXME when Types aren't const.
147 cerr << "Removing type " << OldType->getDescription() << "\n";
149 OldType->removeAbstractTypeUser(this);
151 I->second = (Type*)NewType; // TODO FIXME when types aren't const
152 if (NewType->isAbstract()) {
154 cerr << "Added type " << NewType->getDescription() << "\n";
156 cast<DerivedType>(NewType)->addAbstractTypeUser(this);
163 // Handle situation where type becomes Concreate from Abstract
164 void TypeSymbolTable::typeBecameConcrete(const DerivedType *AbsTy) {
165 // Loop over all of the types in the symbol table, dropping any abstract
166 // type user entries for AbsTy which occur because there are names for the
168 sys::SmartScopedReader<true> Reader(*TypeSymbolTableLock);
169 for (iterator TI = begin(), TE = end(); TI != TE; ++TI)
170 if (TI->second == const_cast<Type*>(static_cast<const Type*>(AbsTy)))
171 AbsTy->removeAbstractTypeUser(this);
174 static void DumpTypes(const std::pair<const std::string, const Type*>& T ) {
175 cerr << " '" << T.first << "' = ";
180 void TypeSymbolTable::dump() const {
181 cerr << "TypeSymbolPlane: ";
182 sys::SmartScopedReader<true> Reader(*TypeSymbolTableLock);
183 for_each(tmap.begin(), tmap.end(), DumpTypes);