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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10752 91177308-0d34-0410-b5e6-96231b3b80d8
206 lines
6.5 KiB
C++
206 lines
6.5 KiB
C++
//===-- llvm/Value.h - Definition of the Value class ------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the very important Value class. This is subclassed by a
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// bunch of other important classes, like Instruction, Function, Type, etc...
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//
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// This file also defines the Use<> template for users of value.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_VALUE_H
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#define LLVM_VALUE_H
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#include "llvm/AbstractTypeUser.h"
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#include "llvm/Use.h"
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#include "Support/Annotation.h"
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#include "Support/Casting.h"
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#include <iostream>
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namespace llvm {
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class Type;
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class Constant;
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class Argument;
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class Instruction;
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class BasicBlock;
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class GlobalValue;
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class Function;
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class GlobalVariable;
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class SymbolTable;
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//===----------------------------------------------------------------------===//
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// Value Class
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//===----------------------------------------------------------------------===//
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/// Value - The base class of all values computed by a program that may be used
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/// as operands to other values.
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///
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struct Value : public Annotable { // Values are annotable
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enum ValueTy {
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TypeVal, // This is an instance of Type
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ConstantVal, // This is an instance of Constant
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ArgumentVal, // This is an instance of Argument
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InstructionVal, // This is an instance of Instruction
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BasicBlockVal, // This is an instance of BasicBlock
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FunctionVal, // This is an instance of Function
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GlobalVariableVal, // This is an instance of GlobalVariable
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};
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private:
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iplist<Use> Uses;
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std::string Name;
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PATypeHolder Ty;
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ValueTy VTy;
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void operator=(const Value &); // Do not implement
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Value(const Value &); // Do not implement
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public:
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Value(const Type *Ty, ValueTy vty, const std::string &name = "");
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virtual ~Value();
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/// dump - Support for debugging, callable in GDB: V->dump()
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//
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virtual void dump() const;
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/// print - Implement operator<< on Value...
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///
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virtual void print(std::ostream &O) const = 0;
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/// All values are typed, get the type of this value.
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///
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inline const Type *getType() const { return Ty; }
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// All values can potentially be named...
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inline bool hasName() const { return !Name.empty(); }
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inline const std::string &getName() const { return Name; }
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virtual void setName(const std::string &name, SymbolTable * = 0) {
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Name = name;
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}
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/// getValueType - Return the immediate subclass of this Value.
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///
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inline ValueTy getValueType() const { return VTy; }
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/// replaceAllUsesWith - Go through the uses list for this definition and make
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/// each use point to "V" instead of "this". After this completes, 'this's
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/// use list is guaranteed to be empty.
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///
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void replaceAllUsesWith(Value *V);
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// uncheckedReplaceAllUsesWith - Just like replaceAllUsesWith but dangerous.
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// Only use when in type resolution situations!
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void uncheckedReplaceAllUsesWith(Value *V);
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//----------------------------------------------------------------------
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// Methods for handling the vector of uses of this Value.
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//
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typedef UseListIteratorWrapper use_iterator;
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typedef UseListConstIteratorWrapper use_const_iterator;
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unsigned use_size() const { return Uses.size(); }
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bool use_empty() const { return Uses.empty(); }
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use_iterator use_begin() { return Uses.begin(); }
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use_const_iterator use_begin() const { return Uses.begin(); }
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use_iterator use_end() { return Uses.end(); }
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use_const_iterator use_end() const { return Uses.end(); }
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User *use_back() { return Uses.back().getUser(); }
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const User *use_back() const { return Uses.back().getUser(); }
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/// hasOneUse - Return true if there is exactly one user of this value. This
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/// is specialized because it is a common request and does not require
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/// traversing the whole use list.
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///
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bool hasOneUse() const {
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iplist<Use>::const_iterator I = Uses.begin(), E = Uses.end();
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if (I == E) return false;
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return ++I == E;
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}
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/// addUse/killUse - These two methods should only be used by the Use class.
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///
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void addUse(Use &U) { Uses.push_back(&U); }
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void killUse(Use &U) { Uses.remove(&U); }
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};
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inline std::ostream &operator<<(std::ostream &OS, const Value *V) {
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if (V == 0)
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OS << "<null> value!\n";
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else
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V->print(OS);
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return OS;
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}
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inline std::ostream &operator<<(std::ostream &OS, const Value &V) {
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V.print(OS);
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return OS;
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}
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inline User *UseListIteratorWrapper::operator*() const {
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return Super::operator*().getUser();
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}
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inline const User *UseListConstIteratorWrapper::operator*() const {
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return Super::operator*().getUser();
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}
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Use::Use(Value *v, User *user) : Val(v), U(user) {
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if (Val) Val->addUse(*this);
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}
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Use::Use(const Use &u) : Val(u.Val), U(u.U) {
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if (Val) Val->addUse(*this);
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}
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Use::~Use() {
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if (Val) Val->killUse(*this);
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}
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void Use::set(Value *V) {
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if (Val) Val->killUse(*this);
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Val = V;
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if (V) V->addUse(*this);
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}
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// isa - Provide some specializations of isa so that we don't have to include
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// the subtype header files to test to see if the value is a subclass...
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//
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template <> inline bool isa_impl<Type, Value>(const Value &Val) {
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return Val.getValueType() == Value::TypeVal;
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}
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template <> inline bool isa_impl<Constant, Value>(const Value &Val) {
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return Val.getValueType() == Value::ConstantVal;
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}
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template <> inline bool isa_impl<Argument, Value>(const Value &Val) {
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return Val.getValueType() == Value::ArgumentVal;
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}
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template <> inline bool isa_impl<Instruction, Value>(const Value &Val) {
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return Val.getValueType() == Value::InstructionVal;
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}
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template <> inline bool isa_impl<BasicBlock, Value>(const Value &Val) {
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return Val.getValueType() == Value::BasicBlockVal;
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}
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template <> inline bool isa_impl<Function, Value>(const Value &Val) {
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return Val.getValueType() == Value::FunctionVal;
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}
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template <> inline bool isa_impl<GlobalVariable, Value>(const Value &Val) {
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return Val.getValueType() == Value::GlobalVariableVal;
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}
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template <> inline bool isa_impl<GlobalValue, Value>(const Value &Val) {
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return isa<GlobalVariable>(Val) || isa<Function>(Val);
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}
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} // End llvm namespace
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#endif
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