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->getValueName())) { 42 //DEBUG(dbgs() << " Inserted value: " << V->getValueName() << ": " << *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->getValueName()->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 auto IterBool = vmap.insert(std::make_pair(UniqueName, V)); 60 if (IterBool.second) { 61 // Newly inserted name. Success! 62 V->setValueName(&*IterBool.first); 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 auto IterBool = vmap.insert(std::make_pair(Name, V)); 81 if (IterBool.second) { 82 //DEBUG(dbgs() << " Inserted value: " << Entry.getKeyData() << ": " 83 // << *V << "\n"); 84 return &*IterBool.first; 85 } 86 87 // Otherwise, there is a naming conflict. Rename this value. 88 SmallString<256> UniqueName(Name.begin(), Name.end()); 89 90 while (1) { 91 // Trim any suffix off and append the next number. 92 UniqueName.resize(Name.size()); 93 raw_svector_ostream(UniqueName) << ++LastUnique; 94 95 // Try insert the vmap entry with this suffix. 96 auto IterBool = vmap.insert(std::make_pair(UniqueName, V)); 97 if (IterBool.second) { 98 // DEBUG(dbgs() << " Inserted value: " << UniqueName << ": " << *V << 99 // "\n"); 100 return &*IterBool.first; 101 } 102 } 103 } 104 105 106 // dump - print out the symbol table 107 // 108 void ValueSymbolTable::dump() const { 109 //DEBUG(dbgs() << "ValueSymbolTable:\n"); 110 for (const_iterator I = begin(), E = end(); I != E; ++I) { 111 //DEBUG(dbgs() << " '" << I->getKeyData() << "' = "); 112 I->getValue()->dump(); 113 //DEBUG(dbgs() << "\n"); 114 } 115 } 116
