//===-- Value.cpp - Implement the Value class -----------------------------===//
//
-// This file implements the Value class.
+// This file implements the Value, User, and SymTabValue classes.
//
//===----------------------------------------------------------------------===//
#include "llvm/InstrTypes.h"
#include "llvm/SymbolTable.h"
#include "llvm/SymTabValue.h"
-#include "llvm/ConstantPool.h"
-#include "llvm/ConstPoolVals.h"
-#include "llvm/Type.h"
+#include "llvm/DerivedTypes.h"
#ifndef NDEBUG // Only in -g mode...
#include "llvm/Assembly/Writer.h"
+#include <iostream>
+using std::cerr;
#endif
#include <algorithm>
// Value Class
//===----------------------------------------------------------------------===//
-Value::Value(const Type *ty, ValueTy vty, const string &name = "") : Name(name){
- Ty = ty;
+static inline const Type *checkType(const Type *Ty) {
+ assert(Ty && "Value defined with a null type: Error!");
+ return Ty;
+}
+
+Value::Value(const Type *ty, ValueTy vty, const std::string &name = "")
+ : Name(name), Ty(checkType(ty), this) {
VTy = vty;
}
Value::~Value() {
#ifndef NDEBUG // Only in -g mode...
+ // Check to make sure that there are no uses of this value that are still
+ // around when the value is destroyed. If there are, then we have a dangling
+ // reference and something is wrong. This code is here to print out what is
+ // still being referenced. The value in question should be printed as
+ // a <badref>
+ //
if (Uses.begin() != Uses.end()) {
- for (use_const_iterator I = Uses.begin(); I != Uses.end(); I++)
- cerr << "Use still stuck around after Def is destroyed:" << *I << endl;
+ cerr << "While deleting: " << this;
+ for (use_const_iterator I = Uses.begin(); I != Uses.end(); ++I)
+ cerr << "Use still stuck around after Def is destroyed:" << *I << "\n";
}
#endif
assert(Uses.begin() == Uses.end());
void Value::replaceAllUsesWith(Value *D) {
assert(D && "Value::replaceAllUsesWith(<null>) is invalid!");
+ assert(D != this && "V->replaceAllUsesWith(V) is NOT valid!");
+ assert(D->getType() == getType() &&
+ "replaceAllUses of value with new value of different type!");
while (!Uses.empty()) {
- User *Use = Uses.front();
+ User *Use = Uses.back();
#ifndef NDEBUG
unsigned NumUses = Uses.size();
#endif
}
}
+// refineAbstractType - This function is implemented because we use
+// potentially abstract types, and these types may be resolved to more
+// concrete types after we are constructed. For the value class, we simply
+// change Ty to point to the right type. :)
+//
+void Value::refineAbstractType(const DerivedType *OldTy, const Type *NewTy) {
+ assert(Ty.get() == OldTy &&"Can't refine anything but my type!");
+ if (OldTy == NewTy && !OldTy->isAbstract())
+ Ty.removeUserFromConcrete();
+ Ty = NewTy;
+}
+
void Value::killUse(User *i) {
if (i == 0) return;
use_iterator I = find(Uses.begin(), Uses.end(), i);
return i;
}
+void Value::dump() const {
+ cerr << this;
+}
//===----------------------------------------------------------------------===//
// User Class
//===----------------------------------------------------------------------===//
-User::User(const Type *Ty, ValueTy vty, const string &name)
+User::User(const Type *Ty, ValueTy vty, const std::string &name)
: Value(Ty, vty, name) {
}
void User::replaceUsesOfWith(Value *From, Value *To) {
if (From == To) return; // Duh what?
- for (unsigned OpNum = 0; Value *D = getOperand(OpNum); OpNum++) {
- if (D == From) { // Okay, this operand is pointing to our fake def.
+ for (unsigned i = 0, E = getNumOperands(); i != E; ++i)
+ if (getOperand(i) == From) { // Is This operand is pointing to oldval?
// The side effects of this setOperand call include linking to
// "To", adding "this" to the uses list of To, and
// most importantly, removing "this" from the use list of "From".
- setOperand(OpNum, To); // Fix it now...
+ setOperand(i, To); // Fix it now...
}
- }
}
// SymTabValue Class
//===----------------------------------------------------------------------===//
-// Instantiate Templates - This ugliness is the price we have to pay
-// for having a ValueHolderImpl.h file seperate from ValueHolder.h! :(
-//
-template class ValueHolder<ConstPoolVal, SymTabValue>;
-
-SymTabValue::SymTabValue(const Type *Ty, ValueTy dty, const string &name = "")
- : Value(Ty, dty, name), ConstPool(this) {
+SymTabValue::SymTabValue(Value *p) : ValueParent(p) {
+ assert(ValueParent && "SymTavValue without parent!?!");
ParentSymTab = SymTab = 0;
}
SymTabValue::~SymTabValue() {
- ConstPool.dropAllReferences();
- ConstPool.delete_all();
- ConstPool.setParent(0);
-
delete SymTab;
}
if (!SymTab) return false;
for (SymbolTable::const_iterator I = SymTab->begin();
- I != SymTab->end(); I++) {
+ I != SymTab->end(); ++I) {
if (I->second.begin() != I->second.end())
return true; // Found nonempty type plane!
}