1 files changed, 137 insertions, 0 deletions
diff --git a/lib/VMCore/ValueSymbolTable.cpp b/lib/VMCore/ValueSymbolTable.cpp
new file mode 100644
index 0000000000000..eee18a164c126
--- /dev/null
+++ b/lib/VMCore/ValueSymbolTable.cpp
@@ -0,0 +1,137 @@
+//===-- ValueSymbolTable.cpp - Implement the ValueSymbolTable class -------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the ValueSymbolTable class for the VMCore library.
+//
+//===----------------------------------------------------------------------===//
+
+#define DEBUG_TYPE "valuesymtab"
+#include "llvm/GlobalValue.h"
+#include "llvm/Type.h"
+#include "llvm/ValueSymbolTable.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/Support/Debug.h"
+using namespace llvm;
+
+// Class destructor
+ValueSymbolTable::~ValueSymbolTable() {
+#ifndef NDEBUG   // Only do this in -g mode...
+  for (iterator VI = vmap.begin(), VE = vmap.end(); VI != VE; ++VI)
+    cerr << "Value still in symbol table! Type = '"
+         << VI->getValue()->getType()->getDescription() << "' Name = '"
+         << VI->getKeyData() << "'\n";
+  assert(vmap.empty() && "Values remain in symbol table!");
+#endif
+}
+
+// lookup a value - Returns null on failure...
+//
+Value *ValueSymbolTable::lookup(const std::string &Name) const {
+  const_iterator VI = vmap.find(Name.data(), Name.data() + Name.size());
+  if (VI != vmap.end())                   // We found the symbol
+    return VI->getValue();
+  return 0;
+}
+
+Value *ValueSymbolTable::lookup(const char *NameBegin,
+                                const char *NameEnd) const {
+  const_iterator VI = vmap.find(NameBegin, NameEnd);
+  if (VI != vmap.end())                   // We found the symbol
+    return VI->getValue();
+  return 0;
+}
+
+// Insert a value into the symbol table with the specified name...
+//
+void ValueSymbolTable::reinsertValue(Value* V) {
+  assert(V->hasName() && "Can't insert nameless Value into symbol table");
+
+  // Try inserting the name, assuming it won't conflict.
+  if (vmap.insert(V->Name)) {
+    //DOUT << " Inserted value: " << V->Name << ": " << *V << "\n";
+    return;
+  }
+  
+  // Otherwise, there is a naming conflict.  Rename this value.
+  SmallString<128> UniqueName(V->getNameStart(), V->getNameEnd());
+
+  // The name is too already used, just free it so we can allocate a new name.
+  V->Name->Destroy();
+  
+  unsigned BaseSize = UniqueName.size();
+  while (1) {
+    // Trim any suffix off.
+    UniqueName.resize(BaseSize);
+    UniqueName.append_uint_32(++LastUnique);
+    // Try insert the vmap entry with this suffix.
+    ValueName &NewName =
+      vmap.GetOrCreateValue(UniqueName.data(),
+                            UniqueName.data() + UniqueName.size());
+    if (NewName.getValue() == 0) {
+      // Newly inserted name.  Success!
+      NewName.setValue(V);
+      V->Name = &NewName;
+      //DEBUG(DOUT << " Inserted value: " << UniqueName << ": " << *V << "\n");
+      return;
+    }
+  }
+}
+
+void ValueSymbolTable::removeValueName(ValueName *V) {
+  //DEBUG(DOUT << " Removing Value: " << V->getKeyData() << "\n");
+  // Remove the value from the symbol table.
+  vmap.remove(V);
+}
+
+/// createValueName - This method attempts to create a value name and insert
+/// it into the symbol table with the specified name.  If it conflicts, it
+/// auto-renames the name and returns that instead.
+ValueName *ValueSymbolTable::createValueName(const char *NameStart,
+                                             unsigned NameLen, Value *V) {
+  // In the common case, the name is not already in the symbol table.
+  ValueName &Entry = vmap.GetOrCreateValue(NameStart, NameStart+NameLen);
+  if (Entry.getValue() == 0) {
+    Entry.setValue(V);
+    //DEBUG(DOUT << " Inserted value: " << Entry.getKeyData() << ": "
+    //           << *V << "\n");
+    return &Entry;
+  }
+  
+  // Otherwise, there is a naming conflict.  Rename this value.
+  SmallString<128> UniqueName(NameStart, NameStart+NameLen);
+  
+  while (1) {
+    // Trim any suffix off.
+    UniqueName.resize(NameLen);
+    UniqueName.append_uint_32(++LastUnique);
+    
+    // Try insert the vmap entry with this suffix.
+    ValueName &NewName =
+      vmap.GetOrCreateValue(UniqueName.data(),
+                            UniqueName.data() + UniqueName.size());
+    if (NewName.getValue() == 0) {
+      // Newly inserted name.  Success!
+      NewName.setValue(V);
+      //DEBUG(DOUT << " Inserted value: " << UniqueName << ": " << *V << "\n");
+      return &NewName;
+    }
+  }
+}
+
+
+// dump - print out the symbol table
+//
+void ValueSymbolTable::dump() const {
+  //DOUT << "ValueSymbolTable:\n";
+  for (const_iterator I = begin(), E = end(); I != E; ++I) {
+    //DOUT << "  '" << I->getKeyData() << "' = ";
+    I->getValue()->dump();
+    //DOUT << "\n";
+  }
+}