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 (const auto &VI : vmap) 28 dbgs() << "Value still in symbol table! Type = '" 29 << *VI.getValue()->getType() << "' Name = '" << VI.getKeyData() 30 << "'\n"; 31 assert(vmap.empty() && "Values remain in symbol table!"); 32 #endif 33 } 34 35 ValueName *ValueSymbolTable::makeUniqueName(Value *V, 36 SmallString<256> &UniqueName) { 37 unsigned BaseSize = UniqueName.size(); 38 while (1) { 39 // Trim any suffix off and append the next number. 40 UniqueName.resize(BaseSize); 41 raw_svector_ostream S(UniqueName); 42 if (isa<GlobalValue>(V)) 43 S << "."; 44 S << ++LastUnique; 45 46 // Try insert the vmap entry with this suffix. 47 auto IterBool = vmap.insert(std::make_pair(UniqueName, V)); 48 if (IterBool.second) 49 return &*IterBool.first; 50 } 51 } 52 53 // Insert a value into the symbol table with the specified name... 54 // 55 void ValueSymbolTable::reinsertValue(Value* V) { 56 assert(V->hasName() && "Can't insert nameless Value into symbol table"); 57 58 // Try inserting the name, assuming it won't conflict. 59 if (vmap.insert(V->getValueName())) { 60 //DEBUG(dbgs() << " Inserted value: " << V->getValueName() << ": " << *V << "\n"); 61 return; 62 } 63 64 // Otherwise, there is a naming conflict. Rename this value. 65 SmallString<256> UniqueName(V->getName().begin(), V->getName().end()); 66 67 // The name is too already used, just free it so we can allocate a new name. 68 V->getValueName()->Destroy(); 69 70 ValueName *VN = makeUniqueName(V, UniqueName); 71 V->setValueName(VN); 72 } 73 74 void ValueSymbolTable::removeValueName(ValueName *V) { 75 //DEBUG(dbgs() << " Removing Value: " << V->getKeyData() << "\n"); 76 // Remove the value from the symbol table. 77 vmap.remove(V); 78 } 79 80 /// createValueName - This method attempts to create a value name and insert 81 /// it into the symbol table with the specified name. If it conflicts, it 82 /// auto-renames the name and returns that instead. 83 ValueName *ValueSymbolTable::createValueName(StringRef Name, Value *V) { 84 // In the common case, the name is not already in the symbol table. 85 auto IterBool = vmap.insert(std::make_pair(Name, V)); 86 if (IterBool.second) { 87 //DEBUG(dbgs() << " Inserted value: " << Entry.getKeyData() << ": " 88 // << *V << "\n"); 89 return &*IterBool.first; 90 } 91 92 // Otherwise, there is a naming conflict. Rename this value. 93 SmallString<256> UniqueName(Name.begin(), Name.end()); 94 return makeUniqueName(V, UniqueName); 95 } 96 97 98 // dump - print out the symbol table 99 // 100 LLVM_DUMP_METHOD void ValueSymbolTable::dump() const { 101 //DEBUG(dbgs() << "ValueSymbolTable:\n"); 102 for (const auto &I : *this) { 103 //DEBUG(dbgs() << " '" << I->getKeyData() << "' = "); 104 I.getValue()->dump(); 105 //DEBUG(dbgs() << "\n"); 106 } 107 } 108
