-//===-- llvm/Value.h - Definition of the Value class -------------*- C++ -*--=//
+//===-- llvm/Value.h - Definition of the Value class ------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
//
// This file defines the very important Value class. This is subclassed by a
// bunch of other important classes, like Instruction, Function, Type, etc...
#ifndef LLVM_VALUE_H
#define LLVM_VALUE_H
-#include <vector>
-#include "llvm/Annotation.h"
#include "llvm/AbstractTypeUser.h"
+#include "llvm/Use.h"
#include "Support/Casting.h"
#include <iostream>
-class User;
+namespace llvm {
+
class Type;
class Constant;
class Argument;
// Value Class
//===----------------------------------------------------------------------===//
-class Value : public Annotable, // Values are annotable
- public AbstractTypeUser { // Values use potentially abstract types
-public:
+/// Value - The base class of all values computed by a program that may be used
+/// as operands to other values.
+///
+struct Value {
enum ValueTy {
TypeVal, // This is an instance of Type
ConstantVal, // This is an instance of Constant
};
private:
- std::vector<User *> Uses;
+ iplist<Use> Uses;
std::string Name;
- PATypeHandle<Type> Ty;
+ PATypeHolder Ty;
ValueTy VTy;
+ void operator=(const Value &); // Do not implement
Value(const Value &); // Do not implement
-protected:
- inline void setType(const Type *ty) { Ty = ty; }
public:
Value(const Type *Ty, ValueTy vty, const std::string &name = "");
virtual ~Value();
- // Support for debugging
- void dump() const;
+ /// dump - Support for debugging, callable in GDB: V->dump()
+ //
+ virtual void dump() const;
- // Implement operator<< on Value...
+ /// print - Implement operator<< on Value...
+ ///
virtual void print(std::ostream &O) const = 0;
- // All values can potentially be typed
+ /// All values are typed, get the type of this value.
+ ///
inline const Type *getType() const { return Ty; }
// All values can potentially be named...
- inline bool hasName() const { return Name != ""; }
+ inline bool hasName() const { return !Name.empty(); }
inline const std::string &getName() const { return Name; }
virtual void setName(const std::string &name, SymbolTable * = 0) {
Name = name;
}
- // Methods for determining the subtype of this Value. The getValueType()
- // method returns the type of the value directly. The cast*() methods are
- // equivalent to using dynamic_cast<>... if the cast is successful, this is
- // returned, otherwise you get a null pointer.
- //
- // The family of functions Val->cast<type>Asserting() is used in the same
- // way as the Val->cast<type>() instructions, but they assert the expected
- // type instead of checking it at runtime.
- //
+ /// getValueType - Return the immediate subclass of this Value.
+ ///
inline ValueTy getValueType() const { return VTy; }
- // replaceAllUsesWith - Go through the uses list for this definition and make
- // each use point to "D" instead of "this". After this completes, 'this's
- // use list should be empty.
- //
- void replaceAllUsesWith(Value *D);
+ /// replaceAllUsesWith - Go through the uses list for this definition and make
+ /// each use point to "V" instead of "this". After this completes, 'this's
+ /// use list is guaranteed to be empty.
+ ///
+ void replaceAllUsesWith(Value *V);
+
+ // uncheckedReplaceAllUsesWith - Just like replaceAllUsesWith but dangerous.
+ // Only use when in type resolution situations!
+ void uncheckedReplaceAllUsesWith(Value *V);
- // 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.
- //
- virtual void refineAbstractType(const DerivedType *OldTy, const Type *NewTy);
-
//----------------------------------------------------------------------
// Methods for handling the vector of uses of this Value.
//
- typedef std::vector<User*>::iterator use_iterator;
- typedef std::vector<User*>::const_iterator use_const_iterator;
-
- inline unsigned use_size() const { return Uses.size(); }
- inline bool use_empty() const { return Uses.empty(); }
- inline use_iterator use_begin() { return Uses.begin(); }
- inline use_const_iterator use_begin() const { return Uses.begin(); }
- inline use_iterator use_end() { return Uses.end(); }
- inline use_const_iterator use_end() const { return Uses.end(); }
- inline User *use_back() { return Uses.back(); }
- inline const User *use_back() const { return Uses.back(); }
-
- inline void use_push_back(User *I) { Uses.push_back(I); }
- User *use_remove(use_iterator &I);
-
- inline void addUse(User *I) { Uses.push_back(I); }
- void killUse(User *I);
+ typedef UseListIteratorWrapper use_iterator;
+ typedef UseListConstIteratorWrapper use_const_iterator;
+
+ unsigned use_size() const { return Uses.size(); }
+ bool use_empty() const { return Uses.empty(); }
+ use_iterator use_begin() { return Uses.begin(); }
+ use_const_iterator use_begin() const { return Uses.begin(); }
+ use_iterator use_end() { return Uses.end(); }
+ use_const_iterator use_end() const { return Uses.end(); }
+ User *use_back() { return Uses.back().getUser(); }
+ const User *use_back() const { return Uses.back().getUser(); }
+
+ /// hasOneUse - Return true if there is exactly one user of this value. This
+ /// is specialized because it is a common request and does not require
+ /// traversing the whole use list.
+ ///
+ bool hasOneUse() const {
+ iplist<Use>::const_iterator I = Uses.begin(), E = Uses.end();
+ if (I == E) return false;
+ return ++I == E;
+ }
+
+ /// addUse/killUse - These two methods should only be used by the Use class.
+ ///
+ void addUse(Use &U) { Uses.push_back(&U); }
+ void killUse(Use &U) { Uses.remove(&U); }
};
inline std::ostream &operator<<(std::ostream &OS, const Value *V) {
}
-//===----------------------------------------------------------------------===//
-// UseTy Class
-//===----------------------------------------------------------------------===//
-
-// UseTy and it's friendly typedefs (Use) are here to make keeping the "use"
-// list of a definition node up-to-date really easy.
-//
-template<class ValueSubclass>
-class UseTy {
- ValueSubclass *Val;
- User *U;
-public:
- inline UseTy<ValueSubclass>(ValueSubclass *v, User *user) {
- Val = v; U = user;
- if (Val) Val->addUse(U);
- }
-
- inline ~UseTy<ValueSubclass>() { if (Val) Val->killUse(U); }
+inline User *UseListIteratorWrapper::operator*() const {
+ return Super::operator*().getUser();
+}
- inline operator ValueSubclass *() const { return Val; }
+inline const User *UseListConstIteratorWrapper::operator*() const {
+ return Super::operator*().getUser();
+}
- inline UseTy<ValueSubclass>(const UseTy<ValueSubclass> &user) {
- Val = 0;
- U = user.U;
- operator=(user.Val);
- }
- inline ValueSubclass *operator=(ValueSubclass *V) {
- if (Val) Val->killUse(U);
- Val = V;
- if (V) V->addUse(U);
- return V;
- }
- inline ValueSubclass *operator->() { return Val; }
- inline const ValueSubclass *operator->() const { return Val; }
+Use::Use(Value *v, User *user) : Val(v), U(user) {
+ if (Val) Val->addUse(*this);
+}
- inline ValueSubclass *get() { return Val; }
- inline const ValueSubclass *get() const { return Val; }
+Use::Use(const Use &u) : Val(u.Val), U(u.U) {
+ if (Val) Val->addUse(*this);
+}
- inline UseTy<ValueSubclass> &operator=(const UseTy<ValueSubclass> &user) {
- if (Val) Val->killUse(U);
- Val = user.Val;
- Val->addUse(U);
- return *this;
- }
-};
+Use::~Use() {
+ if (Val) Val->killUse(*this);
+}
-typedef UseTy<Value> Use; // Provide Use as a common UseTy type
+void Use::set(Value *V) {
+ if (Val) Val->killUse(*this);
+ Val = V;
+ if (V) V->addUse(*this);
+}
-template<typename From> struct simplify_type<UseTy<From> > {
- typedef typename simplify_type<From*>::SimpleType SimpleType;
-
- static SimpleType getSimplifiedValue(const UseTy<From> &Val) {
- return (SimpleType)Val.get();
- }
-};
-template<typename From> struct simplify_type<const UseTy<From> > {
- typedef typename simplify_type<From*>::SimpleType SimpleType;
-
- static SimpleType getSimplifiedValue(const UseTy<From> &Val) {
- return (SimpleType)Val.get();
- }
-};
// isa - Provide some specializations of isa so that we don't have to include
// the subtype header files to test to see if the value is a subclass...
return isa<GlobalVariable>(Val) || isa<Function>(Val);
}
+} // End llvm namespace
+
#endif
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