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As far as simplify_type is concerned, there are 3 kinds of smart pointers: * const correct: A 'const MyPtr<int> &' produces a 'const int*'. A 'MyPtr<int> &' produces a 'int *'. * always const: Even a 'MyPtr<int> &' produces a 'const int*'. * no const: Even a 'const MyPtr<int> &' produces a 'int*'. This patch then does the following: * Removes the unused specializations. Since they are unused, it is hard to know which kind should be implemented. * Make sure we don't drop const. * Fix the default forwarding so that const correct pointer only need one specialization. * Simplifies the existing specializations. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178147 91177308-0d34-0410-b5e6-96231b3b80d8
206 lines
6.8 KiB
C++
206 lines
6.8 KiB
C++
//===-- llvm/User.h - User class definition ---------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This class defines the interface that one who uses a Value must implement.
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// Each instance of the Value class keeps track of what User's have handles
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// to it.
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//
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// * Instructions are the largest class of Users.
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// * Constants may be users of other constants (think arrays and stuff)
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_IR_USER_H
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#define LLVM_IR_USER_H
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#include "llvm/IR/Value.h"
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#include "llvm/Support/ErrorHandling.h"
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namespace llvm {
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/// OperandTraits - Compile-time customization of
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/// operand-related allocators and accessors
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/// for use of the User class
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template <class>
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struct OperandTraits;
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class User : public Value {
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User(const User &) LLVM_DELETED_FUNCTION;
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void *operator new(size_t) LLVM_DELETED_FUNCTION;
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template <unsigned>
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friend struct HungoffOperandTraits;
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virtual void anchor();
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protected:
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/// OperandList - This is a pointer to the array of Uses for this User.
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/// For nodes of fixed arity (e.g. a binary operator) this array will live
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/// prefixed to some derived class instance. For nodes of resizable variable
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/// arity (e.g. PHINodes, SwitchInst etc.), this memory will be dynamically
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/// allocated and should be destroyed by the classes' virtual dtor.
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Use *OperandList;
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/// NumOperands - The number of values used by this User.
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///
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unsigned NumOperands;
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void *operator new(size_t s, unsigned Us);
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User(Type *ty, unsigned vty, Use *OpList, unsigned NumOps)
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: Value(ty, vty), OperandList(OpList), NumOperands(NumOps) {}
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Use *allocHungoffUses(unsigned) const;
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void dropHungoffUses() {
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Use::zap(OperandList, OperandList + NumOperands, true);
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OperandList = 0;
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// Reset NumOperands so User::operator delete() does the right thing.
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NumOperands = 0;
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}
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public:
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~User() {
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Use::zap(OperandList, OperandList + NumOperands);
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}
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/// operator delete - free memory allocated for User and Use objects
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void operator delete(void *Usr);
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/// placement delete - required by std, but never called.
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void operator delete(void*, unsigned) {
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llvm_unreachable("Constructor throws?");
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}
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/// placement delete - required by std, but never called.
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void operator delete(void*, unsigned, bool) {
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llvm_unreachable("Constructor throws?");
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}
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protected:
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template <int Idx, typename U> static Use &OpFrom(const U *that) {
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return Idx < 0
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? OperandTraits<U>::op_end(const_cast<U*>(that))[Idx]
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: OperandTraits<U>::op_begin(const_cast<U*>(that))[Idx];
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}
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template <int Idx> Use &Op() {
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return OpFrom<Idx>(this);
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}
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template <int Idx> const Use &Op() const {
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return OpFrom<Idx>(this);
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}
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public:
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Value *getOperand(unsigned i) const {
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assert(i < NumOperands && "getOperand() out of range!");
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return OperandList[i];
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}
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void setOperand(unsigned i, Value *Val) {
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assert(i < NumOperands && "setOperand() out of range!");
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assert((!isa<Constant>((const Value*)this) ||
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isa<GlobalValue>((const Value*)this)) &&
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"Cannot mutate a constant with setOperand!");
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OperandList[i] = Val;
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}
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const Use &getOperandUse(unsigned i) const {
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assert(i < NumOperands && "getOperandUse() out of range!");
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return OperandList[i];
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}
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Use &getOperandUse(unsigned i) {
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assert(i < NumOperands && "getOperandUse() out of range!");
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return OperandList[i];
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}
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unsigned getNumOperands() const { return NumOperands; }
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// ---------------------------------------------------------------------------
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// Operand Iterator interface...
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//
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typedef Use* op_iterator;
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typedef const Use* const_op_iterator;
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inline op_iterator op_begin() { return OperandList; }
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inline const_op_iterator op_begin() const { return OperandList; }
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inline op_iterator op_end() { return OperandList+NumOperands; }
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inline const_op_iterator op_end() const { return OperandList+NumOperands; }
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/// Convenience iterator for directly iterating over the Values in the
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/// OperandList
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class value_op_iterator : public std::iterator<std::forward_iterator_tag,
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Value*> {
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op_iterator OI;
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public:
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explicit value_op_iterator(Use *U) : OI(U) {}
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bool operator==(const value_op_iterator &x) const {
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return OI == x.OI;
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}
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bool operator!=(const value_op_iterator &x) const {
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return !operator==(x);
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}
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/// Iterator traversal: forward iteration only
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value_op_iterator &operator++() { // Preincrement
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++OI;
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return *this;
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}
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value_op_iterator operator++(int) { // Postincrement
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value_op_iterator tmp = *this; ++*this; return tmp;
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}
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/// Retrieve a pointer to the current Value.
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Value *operator*() const {
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return *OI;
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}
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Value *operator->() const { return operator*(); }
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};
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inline value_op_iterator value_op_begin() {
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return value_op_iterator(op_begin());
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}
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inline value_op_iterator value_op_end() {
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return value_op_iterator(op_end());
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}
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// dropAllReferences() - This function is in charge of "letting go" of all
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// objects that this User refers to. This allows one to
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// 'delete' a whole class at a time, even though there may be circular
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// references... First all references are dropped, and all use counts go to
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// zero. Then everything is deleted for real. Note that no operations are
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// valid on an object that has "dropped all references", except operator
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// delete.
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//
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void dropAllReferences() {
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for (op_iterator i = op_begin(), e = op_end(); i != e; ++i)
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i->set(0);
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}
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/// replaceUsesOfWith - Replaces all references to the "From" definition with
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/// references to the "To" definition.
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///
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void replaceUsesOfWith(Value *From, Value *To);
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// Methods for support type inquiry through isa, cast, and dyn_cast:
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static inline bool classof(const Value *V) {
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return isa<Instruction>(V) || isa<Constant>(V);
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}
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};
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template<> struct simplify_type<User::op_iterator> {
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typedef Value* SimpleType;
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static SimpleType getSimplifiedValue(User::op_iterator &Val) {
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return Val->get();
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}
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};
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template<> struct simplify_type<User::const_op_iterator> {
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typedef /*const*/ Value* SimpleType;
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static SimpleType getSimplifiedValue(User::const_op_iterator &Val) {
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return Val->get();
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}
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};
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// value_use_iterator::getOperandNo - Requires the definition of the User class.
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template<typename UserTy>
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unsigned value_use_iterator<UserTy>::getOperandNo() const {
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return U - U->getUser()->op_begin();
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}
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} // End llvm namespace
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#endif
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