//===-- ValueSymbolTable.cpp - Implement the ValueSymbolTable class -------===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // This file implements the ValueSymbolTable class for the IR library. // //===----------------------------------------------------------------------===// #define DEBUG_TYPE "valuesymtab" #include "llvm/IR/ValueSymbolTable.h" #include "llvm/ADT/SmallString.h" #include "llvm/IR/GlobalValue.h" #include "llvm/IR/Type.h" #include "llvm/Support/Debug.h" #include "llvm/Support/raw_ostream.h" using namespace llvm; // Class destructor ValueSymbolTable::~ValueSymbolTable() { #ifndef NDEBUG // Only do this in -g mode... for (iterator VI = vmap.begin(), VE = vmap.end(); VI != VE; ++VI) dbgs() << "Value still in symbol table! Type = '" << *VI->getValue()->getType() << "' Name = '" << VI->getKeyData() << "'\n"; assert(vmap.empty() && "Values remain in symbol table!"); #endif } // Insert a value into the symbol table with the specified name... // void ValueSymbolTable::reinsertValue(Value* V) { assert(V->hasName() && "Can't insert nameless Value into symbol table"); // Try inserting the name, assuming it won't conflict. if (vmap.insert(V->Name)) { //DEBUG(dbgs() << " Inserted value: " << V->Name << ": " << *V << "\n"); return; } // Otherwise, there is a naming conflict. Rename this value. SmallString<256> UniqueName(V->getName().begin(), V->getName().end()); // The name is too already used, just free it so we can allocate a new name. V->Name->Destroy(); unsigned BaseSize = UniqueName.size(); while (1) { // Trim any suffix off and append the next number. UniqueName.resize(BaseSize); raw_svector_ostream(UniqueName) << ++LastUnique; // Try insert the vmap entry with this suffix. ValueName &NewName = vmap.GetOrCreateValue(UniqueName); if (!NewName.getValue()) { // Newly inserted name. Success! NewName.setValue(V); V->Name = &NewName; //DEBUG(dbgs() << " Inserted value: " << UniqueName << ": " << *V << "\n"); return; } } } void ValueSymbolTable::removeValueName(ValueName *V) { //DEBUG(dbgs() << " Removing Value: " << V->getKeyData() << "\n"); // Remove the value from the symbol table. vmap.remove(V); } /// createValueName - This method attempts to create a value name and insert /// it into the symbol table with the specified name. If it conflicts, it /// auto-renames the name and returns that instead. ValueName *ValueSymbolTable::createValueName(StringRef Name, Value *V) { // In the common case, the name is not already in the symbol table. ValueName &Entry = vmap.GetOrCreateValue(Name); if (!Entry.getValue()) { Entry.setValue(V); //DEBUG(dbgs() << " Inserted value: " << Entry.getKeyData() << ": " // << *V << "\n"); return &Entry; } // Otherwise, there is a naming conflict. Rename this value. SmallString<256> UniqueName(Name.begin(), Name.end()); while (1) { // Trim any suffix off and append the next number. UniqueName.resize(Name.size()); raw_svector_ostream(UniqueName) << ++LastUnique; // Try insert the vmap entry with this suffix. ValueName &NewName = vmap.GetOrCreateValue(UniqueName); if (!NewName.getValue()) { // Newly inserted name. Success! NewName.setValue(V); //DEBUG(dbgs() << " Inserted value: " << UniqueName << ": " << *V << "\n"); return &NewName; } } } // dump - print out the symbol table // void ValueSymbolTable::dump() const { //DEBUG(dbgs() << "ValueSymbolTable:\n"); for (const_iterator I = begin(), E = end(); I != E; ++I) { //DEBUG(dbgs() << " '" << I->getKeyData() << "' = "); I->getValue()->dump(); //DEBUG(dbgs() << "\n"); } }