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
~ValueSymbolTable()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 //
reinsertValue(Value * V)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
removeValueName(ValueName * V)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.
createValueName(StringRef Name,Value * V)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 //
dump() const110 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