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 IR library. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "llvm/IR/ValueSymbolTable.h" 15 #include "llvm/ADT/SmallString.h" 16 #include "llvm/IR/GlobalValue.h" 17 #include "llvm/IR/Type.h" 18 #include "llvm/Support/Debug.h" 19 #include "llvm/Support/raw_ostream.h" 20 using namespace llvm; 21 22 #define DEBUG_TYPE "valuesymtab" 23 24 // Class destructor 25 ValueSymbolTable::~ValueSymbolTable() { 26 #ifndef NDEBUG // Only do this in -g mode... 27 for (iterator VI = vmap.begin(), VE = vmap.end(); VI != VE; ++VI) 28 dbgs() << "Value still in symbol table! Type = '" 29 << *VI->getValue()->getType() << "' Name = '" 30 << VI->getKeyData() << "'\n"; 31 assert(vmap.empty() && "Values remain in symbol table!"); 32 #endif 33 } 34 35 // Insert a value into the symbol table with the specified name... 36 // 37 void ValueSymbolTable::reinsertValue(Value* V) { 38 assert(V->hasName() && "Can't insert nameless Value into symbol table"); 39 40 // Try inserting the name, assuming it won't conflict. 41 if (vmap.insert(V->Name)) { 42 //DEBUG(dbgs() << " Inserted value: " << V->Name << ": " << *V << "\n"); 43 return; 44 } 45 46 // Otherwise, there is a naming conflict. Rename this value. 47 SmallString<256> UniqueName(V->getName().begin(), V->getName().end()); 48 49 // The name is too already used, just free it so we can allocate a new name. 50 V->Name->Destroy(); 51 52 unsigned BaseSize = UniqueName.size(); 53 while (1) { 54 // Trim any suffix off and append the next number. 55 UniqueName.resize(BaseSize); 56 raw_svector_ostream(UniqueName) << ++LastUnique; 57 58 // Try insert the vmap entry with this suffix. 59 ValueName &NewName = vmap.GetOrCreateValue(UniqueName); 60 if (!NewName.getValue()) { 61 // Newly inserted name. Success! 62 NewName.setValue(V); 63 V->Name = &NewName; 64 //DEBUG(dbgs() << " Inserted value: " << UniqueName << ": " << *V << "\n"); 65 return; 66 } 67 } 68 } 69 70 void ValueSymbolTable::removeValueName(ValueName *V) { 71 //DEBUG(dbgs() << " Removing Value: " << V->getKeyData() << "\n"); 72 // Remove the value from the symbol table. 73 vmap.remove(V); 74 } 75 76 /// createValueName - This method attempts to create a value name and insert 77 /// it into the symbol table with the specified name. If it conflicts, it 78 /// auto-renames the name and returns that instead. 79 ValueName *ValueSymbolTable::createValueName(StringRef Name, Value *V) { 80 // In the common case, the name is not already in the symbol table. 81 ValueName &Entry = vmap.GetOrCreateValue(Name); 82 if (!Entry.getValue()) { 83 Entry.setValue(V); 84 //DEBUG(dbgs() << " Inserted value: " << Entry.getKeyData() << ": " 85 // << *V << "\n"); 86 return &Entry; 87 } 88 89 // Otherwise, there is a naming conflict. Rename this value. 90 SmallString<256> UniqueName(Name.begin(), Name.end()); 91 92 while (1) { 93 // Trim any suffix off and append the next number. 94 UniqueName.resize(Name.size()); 95 raw_svector_ostream(UniqueName) << ++LastUnique; 96 97 // Try insert the vmap entry with this suffix. 98 ValueName &NewName = vmap.GetOrCreateValue(UniqueName); 99 if (!NewName.getValue()) { 100 // Newly inserted name. Success! 101 NewName.setValue(V); 102 //DEBUG(dbgs() << " Inserted value: " << UniqueName << ": " << *V << "\n"); 103 return &NewName; 104 } 105 } 106 } 107 108 109 // dump - print out the symbol table 110 // 111 void ValueSymbolTable::dump() const { 112 //DEBUG(dbgs() << "ValueSymbolTable:\n"); 113 for (const_iterator I = begin(), E = end(); I != E; ++I) { 114 //DEBUG(dbgs() << " '" << I->getKeyData() << "' = "); 115 I->getValue()->dump(); 116 //DEBUG(dbgs() << "\n"); 117 } 118 } 119
