return Ty;
}
-Value::Value(const Type *ty, unsigned scid, const std::string &name)
+Value::Value(const Type *ty, unsigned scid)
: SubclassID(scid), SubclassData(0), Ty(checkType(ty)),
- UseList(0), Name(name) {
+ UseList(0), Name(0) {
if (!isa<Constant>(this) && !isa<BasicBlock>(this))
assert((Ty->isFirstClassType() || Ty == Type::VoidTy ||
isa<OpaqueType>(ty)) &&
"Cannot create non-first-class values except for constants!");
- if (ty == Type::VoidTy)
- assert(name.empty() && "Cannot have named void values!");
}
Value::~Value() {
#endif
assert(use_begin() == use_end() && "Uses remain when a value is destroyed!");
+ // If this value is named, destroy the name. This should not be in a symtab
+ // at this point.
+ if (Name)
+ Name->Destroy();
+
// There should be no uses of this object anymore, remove it.
LeakDetector::removeGarbageObject(this);
}
return false;
}
+/// getNameStart - Return a pointer to a null terminated string for this name.
+/// Note that names can have null characters within the string as well as at
+/// their end. This always returns a non-null pointer.
+const char *Value::getNameStart() const {
+ if (Name == 0) return "";
+ return Name->getKeyData();
+}
+
+/// getNameLen - Return the length of the string, correctly handling nul
+/// characters embedded into them.
+unsigned Value::getNameLen() const {
+ return Name->getKeyLength();
+}
+
+
+std::string Value::getNameStr() const {
+ if (Name == 0) return "";
+ return std::string(Name->getKeyData(),
+ Name->getKeyData()+Name->getKeyLength());
+}
+
void Value::setName(const std::string &name) {
- if (Name == name) return; // Name is already set.
+ setName(&name[0], name.size());
+}
+
+void Value::setName(const char *Name) {
+ setName(Name, Name ? strlen(Name) : 0);
+}
+void Value::setName(const char *NameStr, unsigned NameLen) {
+ if (NameLen == 0 && !hasName()) return;
+ assert(getType() != Type::VoidTy && "Cannot assign a name to void values!");
+
// Get the symbol table to update for this object.
ValueSymbolTable *ST;
if (getSymTab(this, ST))
return; // Cannot set a name on this value (e.g. constant).
- if (!ST) // No symbol table to update? Just do the change.
- Name = name;
- else if (hasName()) {
- if (!name.empty()) { // Replacing name.
- ST->remove(this);
- Name = name;
- ST->insert(this);
- } else { // Transitioning from hasName -> noname.
- ST->remove(this);
- Name.clear();
+ if (!ST) { // No symbol table to update? Just do the change.
+ if (NameLen == 0) {
+ // Free the name for this value.
+ Name->Destroy();
+ Name = 0;
+ return;
}
- } else { // Transitioning from noname -> hasName.
- Name = name;
- ST->insert(this);
+
+ if (Name) {
+ // Name isn't changing?
+ if (NameLen == Name->getKeyLength() &&
+ !memcmp(Name->getKeyData(), NameStr, NameLen))
+ return;
+ Name->Destroy();
+ }
+
+ // NOTE: Could optimize for the case the name is shrinking to not deallocate
+ // then reallocated.
+
+ // Create the new name.
+ Name = ValueName::Create(NameStr, NameStr+NameLen);
+ Name->setValue(this);
+ return;
}
+
+ // NOTE: Could optimize for the case the name is shrinking to not deallocate
+ // then reallocated.
+ if (hasName()) {
+ // Name isn't changing?
+ if (NameLen == Name->getKeyLength() &&
+ !memcmp(Name->getKeyData(), NameStr, NameLen))
+ return;
+
+ // Remove old name.
+ ST->removeValueName(Name);
+ Name->Destroy();
+ Name = 0;
+
+ if (NameLen == 0)
+ return;
+ }
+
+ // Name is changing to something new.
+ Name = ST->createValueName(NameStr, NameLen, this);
}
+
/// takeName - transfer the name from V to this value, setting V's name to
/// empty. It is an error to call V->takeName(V).
void Value::takeName(Value *V) {
- if (!V->hasName()) {
- if (hasName())
- setName("");
+ ValueSymbolTable *ST = 0;
+ // If this value has a name, drop it.
+ if (hasName()) {
+ // Get the symtab this is in.
+ if (getSymTab(this, ST)) {
+ // We can't set a name on this value, but we need to clear V's name if
+ // it has one.
+ if (V->hasName()) V->setName(0, 0);
+ return; // Cannot set a name on this value (e.g. constant).
+ }
+
+ // Remove old name.
+ if (ST)
+ ST->removeValueName(Name);
+ Name->Destroy();
+ Name = 0;
+ }
+
+ // Now we know that this has no name.
+
+ // If V has no name either, we're done.
+ if (!V->hasName()) return;
+
+ // Get this's symtab if we didn't before.
+ if (!ST) {
+ if (getSymTab(this, ST)) {
+ // Clear V's name.
+ V->setName(0, 0);
+ return; // Cannot set a name on this value (e.g. constant).
+ }
+ }
+
+ // Get V's ST, this should always succed, because V has a name.
+ ValueSymbolTable *VST;
+ bool Failure = getSymTab(V, VST);
+ assert(!Failure && "V has a name, so it should have a ST!");
+
+ // If these values are both in the same symtab, we can do this very fast.
+ // This works even if both values have no symtab yet.
+ if (ST == VST) {
+ // Take the name!
+ Name = V->Name;
+ V->Name = 0;
+ Name->setValue(this);
return;
}
- std::string Name = V->getName();
- V->setName("");
- setName(Name);
+ // Otherwise, things are slightly more complex. Remove V's name from VST and
+ // then reinsert it into ST.
+
+ if (VST)
+ VST->removeValueName(V->Name);
+ Name = V->Name;
+ V->Name = 0;
+ Name->setValue(this);
+
+ if (ST)
+ ST->reinsertValue(this);
}
projects / oota-llvm.git / blobdiff