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 }
118