-//===-- llvm/Value.h - Definition of the Value class -------------*- C++ -*--=//
+//===-- llvm/Value.h - Definition of the Value class ------------*- C++ -*-===//
//
-// This file defines the very important Value class. This is subclassed by a
-// bunch of other important classes, like Instruction, Function, Type, etc...
+// 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 declares the Value class.
// This file also defines the Use<> template for users of value.
//
//===----------------------------------------------------------------------===//
#define LLVM_VALUE_H
#include "llvm/AbstractTypeUser.h"
-#include "Support/Annotation.h"
-#include "Support/Casting.h"
-#include <iostream>
-#include <vector>
+#include "llvm/Use.h"
+#include "llvm/Support/Casting.h"
+#include "llvm/Support/Streams.h"
+#include <string>
+
+namespace llvm {
-class User;
-class Type;
class Constant;
class Argument;
class Instruction;
class GlobalValue;
class Function;
class GlobalVariable;
-class SymbolTable;
+class GlobalAlias;
+class InlineAsm;
+class ValueSymbolTable;
+class TypeSymbolTable;
+template<typename ValueTy> class StringMapEntry;
+typedef StringMapEntry<Value*> ValueName;
//===----------------------------------------------------------------------===//
// Value Class
//===----------------------------------------------------------------------===//
-/// Value - The base class of all values computed by a program that may be used
-/// as operands to other values.
+/// This is a very important LLVM class. It is the base class of all values
+/// computed by a program that may be used as operands to other values. Value is
+/// the super class of other important classes such as Instruction and Function.
+/// All Values have a Type. Type is not a subclass of Value. All types can have
+/// a name and they should belong to some Module. Setting the name on the Value
+/// automatically update's the module's symbol table.
///
-class Value : public Annotable, // Values are annotable
- public AbstractTypeUser { // Values use potentially abstract types
-public:
- enum ValueTy {
- TypeVal, // This is an instance of Type
- ConstantVal, // This is an instance of Constant
- ArgumentVal, // This is an instance of Argument
- InstructionVal, // This is an instance of Instruction
- BasicBlockVal, // This is an instance of BasicBlock
- FunctionVal, // This is an instance of Function
- GlobalVariableVal, // This is an instance of GlobalVariable
- };
-
+/// Every value has a "use list" that keeps track of which other Values are
+/// using this Value.
+/// @brief LLVM Value Representation
+class Value {
+ const unsigned short SubclassID; // Subclass identifier (for isa/dyn_cast)
+protected:
+ /// SubclassData - This member is defined by this class, but is not used for
+ /// anything. Subclasses can use it to hold whatever state they find useful.
+ /// This field is initialized to zero by the ctor.
+ unsigned short SubclassData;
private:
- std::vector<User *> Uses;
- std::string Name;
- PATypeHandle Ty;
- ValueTy VTy;
+ PATypeHolder Ty;
+ Use *UseList;
+
+ friend class ValueSymbolTable; // Allow ValueSymbolTable to directly mod Name.
+ friend class SymbolTable; // Allow SymbolTable to directly poke Name.
+ ValueName *Name;
void operator=(const Value &); // Do not implement
Value(const Value &); // Do not implement
+
public:
- Value(const Type *Ty, ValueTy vty, const std::string &name = "");
+ Value(const Type *Ty, unsigned scid);
virtual ~Value();
-
+
/// dump - Support for debugging, callable in GDB: V->dump()
//
- void dump() const;
+ virtual void dump() const;
/// print - Implement operator<< on Value...
///
virtual void print(std::ostream &O) const = 0;
-
+ void print(std::ostream *O) const { if (O) print(*O); }
+
/// 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 const std::string &getName() const { return Name; }
+ inline bool hasName() const { return Name != 0; }
+ ValueName *getValueName() const { return Name; }
- virtual void setName(const std::string &name, SymbolTable * = 0) {
- Name = name;
- }
+ /// 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 *getNameStart() const;
- /// getValueType - Return the immediate subclass of this Value.
- ///
- inline ValueTy getValueType() const { return VTy; }
+ /// getNameLen - Return the length of the string, correctly handling nul
+ /// characters embedded into them.
+ unsigned getNameLen() const;
+
+ /// getName()/getNameStr() - Return the name of the specified value,
+ /// *constructing a string* to hold it. Because these are guaranteed to
+ /// construct a string, they are very expensive and should be avoided.
+ std::string getName() const { return getNameStr(); }
+ std::string getNameStr() const;
+
+
+ void setName(const std::string &name);
+ void setName(const char *Name, unsigned NameLen);
+ void setName(const char *Name); // Takes a null-terminated string.
+
+ /// 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 takeName(Value *V);
+
/// replaceAllUsesWith - Go through the uses list for this definition and make
- /// each use point to "V" instead of "this". After this completes, 'this's
+ /// each use point to "V" instead of "this". After this completes, 'this's
/// use list is guaranteed to be empty.
///
void replaceAllUsesWith(Value *V);
// 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(); }
-
- /// addUse/killUse - These two methods should only be used by the Use class
- /// below.
- inline void addUse(User *I) { Uses.push_back(I); }
- void killUse(User *I);
-};
+ typedef value_use_iterator<User> use_iterator;
+ typedef value_use_iterator<const User> use_const_iterator;
-inline std::ostream &operator<<(std::ostream &OS, const Value *V) {
- if (V == 0)
- OS << "<null> value!\n";
- else
- V->print(OS);
- return OS;
-}
-
-inline std::ostream &operator<<(std::ostream &OS, const Value &V) {
- V.print(OS);
- return OS;
-}
+ bool use_empty() const { return UseList == 0; }
+ use_iterator use_begin() { return use_iterator(UseList); }
+ use_const_iterator use_begin() const { return use_const_iterator(UseList); }
+ use_iterator use_end() { return use_iterator(0); }
+ use_const_iterator use_end() const { return use_const_iterator(0); }
+ User *use_back() { return *use_begin(); }
+ const User *use_back() const { return *use_begin(); }
+ /// 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 {
+ use_const_iterator I = use_begin(), E = use_end();
+ if (I == E) return false;
+ return ++I == E;
+ }
-//===----------------------------------------------------------------------===//
-// Use Class
-//===----------------------------------------------------------------------===//
+ /// hasNUses - Return true if this Value has exactly N users.
+ ///
+ bool hasNUses(unsigned N) const;
-// Use is here to make keeping the "use" list of a Value up-to-date really easy.
-//
-class Use {
- Value *Val;
- User *U;
-public:
- inline Use(Value *v, User *user) {
- Val = v; U = user;
- if (Val) Val->addUse(U);
- }
+ /// hasNUsesOrMore - Return true if this value has N users or more. This is
+ /// logically equivalent to getNumUses() >= N.
+ ///
+ bool hasNUsesOrMore(unsigned N) const;
- inline Use(const Use &user) {
- Val = 0;
- U = user.U;
- operator=(user.Val);
- }
- inline ~Use() { if (Val) Val->killUse(U); }
- inline operator Value*() const { return Val; }
-
- inline Value *operator=(Value *V) {
- if (Val) Val->killUse(U);
- Val = V;
- if (V) V->addUse(U);
- return V;
- }
+ /// getNumUses - This method computes the number of uses of this Value. This
+ /// is a linear time operation. Use hasOneUse, hasNUses, or hasMoreThanNUses
+ /// to check for specific values.
+ unsigned getNumUses() const;
- inline Value *operator->() { return Val; }
- inline const Value *operator->() const { return Val; }
+ /// addUse/killUse - These two methods should only be used by the Use class.
+ ///
+ void addUse(Use &U) { U.addToList(&UseList); }
- inline Value *get() { return Val; }
- inline const Value *get() const { return Val; }
+ /// An enumeration for keeping track of the concrete subclass of Value that
+ /// is actually instantiated. Values of this enumeration are kept in the
+ /// Value classes SubclassID field. They are used for concrete type
+ /// identification.
+ enum ValueTy {
+ ArgumentVal, // This is an instance of Argument
+ BasicBlockVal, // This is an instance of BasicBlock
+ FunctionVal, // This is an instance of Function
+ GlobalAliasVal, // This is an instance of GlobalAlias
+ GlobalVariableVal, // This is an instance of GlobalVariable
+ UndefValueVal, // This is an instance of UndefValue
+ ConstantExprVal, // This is an instance of ConstantExpr
+ ConstantAggregateZeroVal, // This is an instance of ConstantAggregateNull
+ ConstantIntVal, // This is an instance of ConstantInt
+ ConstantFPVal, // This is an instance of ConstantFP
+ ConstantArrayVal, // This is an instance of ConstantArray
+ ConstantStructVal, // This is an instance of ConstantStruct
+ ConstantVectorVal, // This is an instance of ConstantVector
+ ConstantPointerNullVal, // This is an instance of ConstantPointerNull
+ InlineAsmVal, // This is an instance of InlineAsm
+ InstructionVal, // This is an instance of Instruction
+
+ // Markers:
+ ConstantFirstVal = FunctionVal,
+ ConstantLastVal = ConstantPointerNullVal
+ };
- inline const Use &operator=(const Use &user) {
- if (Val) Val->killUse(U);
- Val = user.Val;
- Val->addUse(U);
- return *this;
+ /// getValueID - Return an ID for the concrete type of this object. This is
+ /// used to implement the classof checks. This should not be used for any
+ /// other purpose, as the values may change as LLVM evolves. Also, note that
+ /// for instructions, the Instruction's opcode is added to InstructionVal. So
+ /// this means three things:
+ /// # there is no value with code InstructionVal (no opcode==0).
+ /// # there are more possible values for the value type than in ValueTy enum.
+ /// # the InstructionVal enumerator must be the highest valued enumerator in
+ /// the ValueTy enum.
+ unsigned getValueID() const {
+ return SubclassID;
}
-};
-template<> struct simplify_type<Use> {
- typedef Value* SimpleType;
-
- static SimpleType getSimplifiedValue(const Use &Val) {
- return (SimpleType)Val.get();
- }
-};
-template<> struct simplify_type<const Use> {
- typedef Value* SimpleType;
-
- static SimpleType getSimplifiedValue(const Use &Val) {
- return (SimpleType)Val.get();
+ // Methods for support type inquiry through isa, cast, and dyn_cast:
+ static inline bool classof(const Value *) {
+ return true; // Values are always values.
}
+
+ /// getRawType - This should only be used to implement the vmcore library.
+ ///
+ const Type *getRawType() const { return Ty.getRawType(); }
};
+inline std::ostream &operator<<(std::ostream &OS, const Value &V) {
+ V.print(OS);
+ return OS;
+}
+
+void Use::init(Value *v, User *user) {
+ Val = v;
+ U = user;
+ if (Val) Val->addUse(*this);
+}
+
+Use::~Use() {
+ if (Val) removeFromList();
+}
+
+void Use::set(Value *V) {
+ if (Val) removeFromList();
+ Val = V;
+ if (V) V->addUse(*this);
+}
+
+
// 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...
//
-template <> inline bool isa_impl<Type, Value>(const Value &Val) {
- return Val.getValueType() == Value::TypeVal;
+template <> inline bool isa_impl<Constant, Value>(const Value &Val) {
+ return Val.getValueID() >= Value::ConstantFirstVal &&
+ Val.getValueID() <= Value::ConstantLastVal;
}
-template <> inline bool isa_impl<Constant, Value>(const Value &Val) {
- return Val.getValueType() == Value::ConstantVal;
+template <> inline bool isa_impl<Argument, Value>(const Value &Val) {
+ return Val.getValueID() == Value::ArgumentVal;
}
-template <> inline bool isa_impl<Argument, Value>(const Value &Val) {
- return Val.getValueType() == Value::ArgumentVal;
+template <> inline bool isa_impl<InlineAsm, Value>(const Value &Val) {
+ return Val.getValueID() == Value::InlineAsmVal;
}
-template <> inline bool isa_impl<Instruction, Value>(const Value &Val) {
- return Val.getValueType() == Value::InstructionVal;
+template <> inline bool isa_impl<Instruction, Value>(const Value &Val) {
+ return Val.getValueID() >= Value::InstructionVal;
}
-template <> inline bool isa_impl<BasicBlock, Value>(const Value &Val) {
- return Val.getValueType() == Value::BasicBlockVal;
+template <> inline bool isa_impl<BasicBlock, Value>(const Value &Val) {
+ return Val.getValueID() == Value::BasicBlockVal;
}
-template <> inline bool isa_impl<Function, Value>(const Value &Val) {
- return Val.getValueType() == Value::FunctionVal;
+template <> inline bool isa_impl<Function, Value>(const Value &Val) {
+ return Val.getValueID() == Value::FunctionVal;
}
-template <> inline bool isa_impl<GlobalVariable, Value>(const Value &Val) {
- return Val.getValueType() == Value::GlobalVariableVal;
+template <> inline bool isa_impl<GlobalVariable, Value>(const Value &Val) {
+ return Val.getValueID() == Value::GlobalVariableVal;
}
-template <> inline bool isa_impl<GlobalValue, Value>(const Value &Val) {
- return isa<GlobalVariable>(Val) || isa<Function>(Val);
+template <> inline bool isa_impl<GlobalAlias, Value>(const Value &Val) {
+ return Val.getValueID() == Value::GlobalAliasVal;
}
+template <> inline bool isa_impl<GlobalValue, Value>(const Value &Val) {
+ return isa<GlobalVariable>(Val) || isa<Function>(Val) || isa<GlobalAlias>(Val);
+}
+
+} // End llvm namespace
#endif
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