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/ADT/StringRef.h"
18 #include "llvm/Support/Debug.h"
19 #include "llvm/Support/ManagedStatic.h"
20 #include "llvm/Support/raw_ostream.h"
24 #define DEBUG_SYMBOL_TABLE 0
25 #define DEBUG_ABSTYPE 0
27 TypeSymbolTable::~TypeSymbolTable() {
28 // Drop all abstract type references in the type plane...
29 for (iterator TI = tmap.begin(), TE = tmap.end(); TI != TE; ++TI) {
30 if (TI->second->isAbstract()) // If abstract, drop the reference...
31 cast<DerivedType>(TI->second)->removeAbstractTypeUser(this);
35 std::string TypeSymbolTable::getUniqueName(StringRef BaseName) const {
36 std::string TryName = BaseName;
38 const_iterator End = tmap.end();
40 // See if the name exists
41 while (tmap.find(TryName) != End) // Loop until we find a free
42 TryName = BaseName.str() + utostr(++LastUnique); // name in the symbol table
46 // lookup a type by name - returns null on failure
47 Type* TypeSymbolTable::lookup(StringRef Name) const {
48 const_iterator TI = tmap.find(Name);
51 result = const_cast<Type*>(TI->second);
55 // remove - Remove a type from the symbol table...
56 Type* TypeSymbolTable::remove(iterator Entry) {
57 assert(Entry != tmap.end() && "Invalid entry to remove!");
58 const Type* Result = Entry->second;
60 #if DEBUG_SYMBOL_TABLE
62 dbgs() << " Removing Value: " << Result->getDescription() << "\n";
67 // If we are removing an abstract type, remove the symbol table from it's use
69 if (Result->isAbstract()) {
71 dbgs() << "Removing abstract type from symtab"
72 << Result->getDescription()
75 cast<DerivedType>(Result)->removeAbstractTypeUser(this);
78 return const_cast<Type*>(Result);
82 // insert - Insert a type into the symbol table with the specified name...
83 void TypeSymbolTable::insert(StringRef Name, const Type* T) {
84 assert(T && "Can't insert null type into symbol table!");
86 if (tmap.insert(std::make_pair(Name, T)).second) {
87 // Type inserted fine with no conflict.
89 #if DEBUG_SYMBOL_TABLE
91 dbgs() << " Inserted type: " << Name << ": " << T->getDescription() << "\n";
94 // If there is a name conflict...
96 // Check to see if there is a naming conflict. If so, rename this type!
97 std::string UniqueName = Name;
99 UniqueName = getUniqueName(Name);
101 #if DEBUG_SYMBOL_TABLE
103 dbgs() << " Inserting type: " << UniqueName << ": "
104 << T->getDescription() << "\n";
107 // Insert the tmap entry
108 tmap.insert(make_pair(UniqueName, T));
111 // If we are adding an abstract type, add the symbol table to it's use list.
112 if (T->isAbstract()) {
113 cast<DerivedType>(T)->addAbstractTypeUser(this);
115 dbgs() << "Added abstract type to ST: " << T->getDescription() << "\n";
120 // This function is called when one of the types in the type plane are refined
121 void TypeSymbolTable::refineAbstractType(const DerivedType *OldType,
122 const Type *NewType) {
123 // Loop over all of the types in the symbol table, replacing any references
124 // to OldType with references to NewType. Note that there may be multiple
125 // occurrences, and although we only need to remove one at a time, it's
126 // faster to remove them all in one pass.
128 for (iterator I = begin(), E = end(); I != E; ++I) {
129 if (I->second == (Type*)OldType) { // FIXME when Types aren't const.
131 dbgs() << "Removing type " << OldType->getDescription() << "\n";
133 OldType->removeAbstractTypeUser(this);
135 I->second = (Type*)NewType; // TODO FIXME when types aren't const
136 if (NewType->isAbstract()) {
138 dbgs() << "Added type " << NewType->getDescription() << "\n";
140 cast<DerivedType>(NewType)->addAbstractTypeUser(this);
147 // Handle situation where type becomes Concreate from Abstract
148 void TypeSymbolTable::typeBecameConcrete(const DerivedType *AbsTy) {
149 // Loop over all of the types in the symbol table, dropping any abstract
150 // type user entries for AbsTy which occur because there are names for the
152 for (iterator TI = begin(), TE = end(); TI != TE; ++TI)
153 if (TI->second == const_cast<Type*>(static_cast<const Type*>(AbsTy)))
154 AbsTy->removeAbstractTypeUser(this);
157 static void DumpTypes(const std::pair<const std::string, const Type*>& T ) {
158 dbgs() << " '" << T.first << "' = ";
163 void TypeSymbolTable::dump() const {
164 dbgs() << "TypeSymbolPlane: ";
165 for_each(tmap.begin(), tmap.end(), DumpTypes);