lib/VMCore/ValueSymbolTable.cpp

   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     errs() << "Value still in symbol table! Type = '"
  28            << VI->getValue()->getType()->getDescription() << "' 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     //DOUT << " Inserted value: " << V->Name << ": " << *V << "\n";
  42     return;
  43   }
  44
  45   // Otherwise, there is a naming conflict.  Rename this value.
  46   SmallString<128> 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.
  54     UniqueName.resize(BaseSize);
  55     UniqueName.append_uint_32(++LastUnique);
  56     // Try insert the vmap entry with this suffix.
  57     ValueName &NewName =
  58       vmap.GetOrCreateValue(StringRef(UniqueName.data(),
  59                                       UniqueName.size()));
  60     if (NewName.getValue() == 0) {
  61       // Newly inserted name.  Success!
  62       NewName.setValue(V);
  63       V->Name = &NewName;
  64       //DEBUG(DOUT << " Inserted value: " << UniqueName << ": " << *V << "\n");
  65       return;
  66     }
  67   }
  68 }
  69
  70 void ValueSymbolTable::removeValueName(ValueName *V) {
  71   //DEBUG(DOUT << " 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(const 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() == 0) {
  83     Entry.setValue(V);
  84     //DEBUG(DOUT << " Inserted value: " << Entry.getKeyData() << ": "
  85     //           << *V << "\n");
  86     return &Entry;
  87   }
  88
  89   // Otherwise, there is a naming conflict.  Rename this value.
  90   SmallString<128> UniqueName(Name.begin(), Name.end());
  91
  92   while (1) {
  93     // Trim any suffix off.
  94     UniqueName.resize(Name.size());
  95     UniqueName.append_uint_32(++LastUnique);
  96
  97     // Try insert the vmap entry with this suffix.
  98     ValueName &NewName =
  99       vmap.GetOrCreateValue(StringRef(UniqueName.data(),
 100                                       UniqueName.size()));
 101     if (NewName.getValue() == 0) {
 102       // Newly inserted name.  Success!
 103       NewName.setValue(V);
 104       //DEBUG(DOUT << " Inserted value: " << UniqueName << ": " << *V << "\n");
 105       return &NewName;
 106     }
 107   }
 108 }
 109
 110
 111 // dump - print out the symbol table
 112 //
 113 void ValueSymbolTable::dump() const {
 114   //DOUT << "ValueSymbolTable:\n";
 115   for (const_iterator I = begin(), E = end(); I != E; ++I) {
 116     //DOUT << "  '" << I->getKeyData() << "' = ";
 117     I->getValue()->dump();
 118     //DOUT << "\n";
 119   }
 120 }