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