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     dbgs() << "Value still in symbol table! Type = '"
  28            << *VI->getValue()->getType() << "' 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     //DEBUG(dbgs() << " Inserted value: " << V->Name << ": " << *V << "\n");
  42     return;
  43   }
  44
  45   // Otherwise, there is a naming conflict.  Rename this value.
  46   SmallString<256> 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 and append the next number.
  54     UniqueName.resize(BaseSize);
  55     raw_svector_ostream(UniqueName) << ++LastUnique;
  56
  57     // Try insert the vmap entry with this suffix.
  58     ValueName &NewName = vmap.GetOrCreateValue(UniqueName);
  59     if (NewName.getValue() == 0) {
  60       // Newly inserted name.  Success!
  61       NewName.setValue(V);
  62       V->Name = &NewName;
  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   ValueName &Entry = vmap.GetOrCreateValue(Name);
  81   if (Entry.getValue() == 0) {
  82     Entry.setValue(V);
  83     //DEBUG(dbgs() << " Inserted value: " << Entry.getKeyData() << ": "
  84     //           << *V << "\n");
  85     return &Entry;
  86   }
  87
  88   // Otherwise, there is a naming conflict.  Rename this value.
  89   SmallString<256> UniqueName(Name.begin(), Name.end());
  90
  91   while (1) {
  92     // Trim any suffix off and append the next number.
  93     UniqueName.resize(Name.size());
  94     raw_svector_ostream(UniqueName) << ++LastUnique;
  95
  96     // Try insert the vmap entry with this suffix.
  97     ValueName &NewName = vmap.GetOrCreateValue(UniqueName);
  98     if (NewName.getValue() == 0) {
  99       // Newly inserted name.  Success!
 100       NewName.setValue(V);
 101      //DEBUG(dbgs() << " Inserted value: " << UniqueName << ": " << *V << "\n");
 102       return &NewName;
 103     }
 104   }
 105 }
 106
 107
 108 // dump - print out the symbol table
 109 //
 110 void ValueSymbolTable::dump() const {
 111   //DEBUG(dbgs() << "ValueSymbolTable:\n");
 112   for (const_iterator I = begin(), E = end(); I != E; ++I) {
 113     //DEBUG(dbgs() << "  '" << I->getKeyData() << "' = ");
 114     I->getValue()->dump();
 115     //DEBUG(dbgs() << "\n");
 116   }
 117 }