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"
20using namespace llvm;
21
22#define DEBUG_TYPE "valuesymtab"
23
24// Class destructor
25ValueSymbolTable::~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
35ValueName *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//
55void 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
74void 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.
83ValueName *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//
100LLVM_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