1 //===-- ValueSymbolTable.cpp - Implement the ValueSymbolTable class -------===// 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 implements the ValueSymbolTable class for the VMCore library. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #define DEBUG_TYPE "valuesymtab" 15 #include "llvm/GlobalValue.h" 16 #include "llvm/Type.h" 17 #include "llvm/ValueSymbolTable.h" 18 #include "llvm/ADT/SmallString.h" 19 #include "llvm/Support/Debug.h" 20 #include "llvm/Support/raw_ostream.h" 21 using namespace llvm; 22 23 // Class destructor 24 ValueSymbolTable::~ValueSymbolTable() { 25 #ifndef NDEBUG // Only do this in -g mode... 26 for (iterator VI = vmap.begin(), VE = vmap.end(); VI != VE; ++VI) 27 dbgs() << "Value still in symbol table! Type = '" 28 << *VI->getValue()->getType() << "' Name = '" 29 << VI->getKeyData() << "'\n"; 30 assert(vmap.empty() && "Values remain in symbol table!"); 31 #endif 32 } 33 34 // Insert a value into the symbol table with the specified name... 35 // 36 void ValueSymbolTable::reinsertValue(Value* V) { 37 assert(V->hasName() && "Can't insert nameless Value into symbol table"); 38 39 // Try inserting the name, assuming it won't conflict. 40 if (vmap.insert(V->Name)) { 41 //DEBUG(dbgs() << " Inserted value: " << V->Name << ": " << *V << "\n"); 42 return; 43 } 44 45 // Otherwise, there is a naming conflict. Rename this value. 46 SmallString<256> UniqueName(V->getName().begin(), V->getName().end()); 47 48 // The name is too already used, just free it so we can allocate a new name. 49 V->Name->Destroy(); 50 51 unsigned BaseSize = UniqueName.size(); 52 while (1) { 53 // Trim any suffix off and append the next number. 54 UniqueName.resize(BaseSize); 55 raw_svector_ostream(UniqueName) << ++LastUnique; 56 57 // Try insert the vmap entry with this suffix. 58 ValueName &NewName = vmap.GetOrCreateValue(UniqueName); 59 if (NewName.getValue() == 0) { 60 // Newly inserted name. Success! 61 NewName.setValue(V); 62 V->Name = &NewName; 63 //DEBUG(dbgs() << " Inserted value: " << UniqueName << ": " << *V << "\n"); 64 return; 65 } 66 } 67 } 68 69 void ValueSymbolTable::removeValueName(ValueName *V) { 70 //DEBUG(dbgs() << " Removing Value: " << V->getKeyData() << "\n"); 71 // Remove the value from the symbol table. 72 vmap.remove(V); 73 } 74 75 /// createValueName - This method attempts to create a value name and insert 76 /// it into the symbol table with the specified name. If it conflicts, it 77 /// auto-renames the name and returns that instead. 78 ValueName *ValueSymbolTable::createValueName(StringRef Name, Value *V) { 79 // In the common case, the name is not already in the symbol table. 80 ValueName &Entry = vmap.GetOrCreateValue(Name); 81 if (Entry.getValue() == 0) { 82 Entry.setValue(V); 83 //DEBUG(dbgs() << " Inserted value: " << Entry.getKeyData() << ": " 84 // << *V << "\n"); 85 return &Entry; 86 } 87 88 // Otherwise, there is a naming conflict. Rename this value. 89 SmallString<256> UniqueName(Name.begin(), Name.end()); 90 91 while (1) { 92 // Trim any suffix off and append the next number. 93 UniqueName.resize(Name.size()); 94 raw_svector_ostream(UniqueName) << ++LastUnique; 95 96 // Try insert the vmap entry with this suffix. 97 ValueName &NewName = vmap.GetOrCreateValue(UniqueName); 98 if (NewName.getValue() == 0) { 99 // Newly inserted name. Success! 100 NewName.setValue(V); 101 //DEBUG(dbgs() << " Inserted value: " << UniqueName << ": " << *V << "\n"); 102 return &NewName; 103 } 104 } 105 } 106 107 108 // dump - print out the symbol table 109 // 110 void ValueSymbolTable::dump() const { 111 //DEBUG(dbgs() << "ValueSymbolTable:\n"); 112 for (const_iterator I = begin(), E = end(); I != E; ++I) { 113 //DEBUG(dbgs() << " '" << I->getKeyData() << "' = "); 114 I->getValue()->dump(); 115 //DEBUG(dbgs() << "\n"); 116 } 117 } 118
