mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-10-31 07:52:55 +01:00
8a0ed6dcd6
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. llvm-svn: 178147
206 lines
6.8 KiB
C++
206 lines
6.8 KiB
C++
//===-- llvm/User.h - User class definition ---------------------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This class defines the interface that one who uses a Value must implement.
|
|
// Each instance of the Value class keeps track of what User's have handles
|
|
// to it.
|
|
//
|
|
// * Instructions are the largest class of Users.
|
|
// * Constants may be users of other constants (think arrays and stuff)
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_IR_USER_H
|
|
#define LLVM_IR_USER_H
|
|
|
|
#include "llvm/IR/Value.h"
|
|
#include "llvm/Support/ErrorHandling.h"
|
|
|
|
namespace llvm {
|
|
|
|
/// OperandTraits - Compile-time customization of
|
|
/// operand-related allocators and accessors
|
|
/// for use of the User class
|
|
template <class>
|
|
struct OperandTraits;
|
|
|
|
class User : public Value {
|
|
User(const User &) LLVM_DELETED_FUNCTION;
|
|
void *operator new(size_t) LLVM_DELETED_FUNCTION;
|
|
template <unsigned>
|
|
friend struct HungoffOperandTraits;
|
|
virtual void anchor();
|
|
protected:
|
|
/// OperandList - This is a pointer to the array of Uses for this User.
|
|
/// For nodes of fixed arity (e.g. a binary operator) this array will live
|
|
/// prefixed to some derived class instance. For nodes of resizable variable
|
|
/// arity (e.g. PHINodes, SwitchInst etc.), this memory will be dynamically
|
|
/// allocated and should be destroyed by the classes' virtual dtor.
|
|
Use *OperandList;
|
|
|
|
/// NumOperands - The number of values used by this User.
|
|
///
|
|
unsigned NumOperands;
|
|
|
|
void *operator new(size_t s, unsigned Us);
|
|
User(Type *ty, unsigned vty, Use *OpList, unsigned NumOps)
|
|
: Value(ty, vty), OperandList(OpList), NumOperands(NumOps) {}
|
|
Use *allocHungoffUses(unsigned) const;
|
|
void dropHungoffUses() {
|
|
Use::zap(OperandList, OperandList + NumOperands, true);
|
|
OperandList = 0;
|
|
// Reset NumOperands so User::operator delete() does the right thing.
|
|
NumOperands = 0;
|
|
}
|
|
public:
|
|
~User() {
|
|
Use::zap(OperandList, OperandList + NumOperands);
|
|
}
|
|
/// operator delete - free memory allocated for User and Use objects
|
|
void operator delete(void *Usr);
|
|
/// placement delete - required by std, but never called.
|
|
void operator delete(void*, unsigned) {
|
|
llvm_unreachable("Constructor throws?");
|
|
}
|
|
/// placement delete - required by std, but never called.
|
|
void operator delete(void*, unsigned, bool) {
|
|
llvm_unreachable("Constructor throws?");
|
|
}
|
|
protected:
|
|
template <int Idx, typename U> static Use &OpFrom(const U *that) {
|
|
return Idx < 0
|
|
? OperandTraits<U>::op_end(const_cast<U*>(that))[Idx]
|
|
: OperandTraits<U>::op_begin(const_cast<U*>(that))[Idx];
|
|
}
|
|
template <int Idx> Use &Op() {
|
|
return OpFrom<Idx>(this);
|
|
}
|
|
template <int Idx> const Use &Op() const {
|
|
return OpFrom<Idx>(this);
|
|
}
|
|
public:
|
|
Value *getOperand(unsigned i) const {
|
|
assert(i < NumOperands && "getOperand() out of range!");
|
|
return OperandList[i];
|
|
}
|
|
void setOperand(unsigned i, Value *Val) {
|
|
assert(i < NumOperands && "setOperand() out of range!");
|
|
assert((!isa<Constant>((const Value*)this) ||
|
|
isa<GlobalValue>((const Value*)this)) &&
|
|
"Cannot mutate a constant with setOperand!");
|
|
OperandList[i] = Val;
|
|
}
|
|
const Use &getOperandUse(unsigned i) const {
|
|
assert(i < NumOperands && "getOperandUse() out of range!");
|
|
return OperandList[i];
|
|
}
|
|
Use &getOperandUse(unsigned i) {
|
|
assert(i < NumOperands && "getOperandUse() out of range!");
|
|
return OperandList[i];
|
|
}
|
|
|
|
unsigned getNumOperands() const { return NumOperands; }
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// Operand Iterator interface...
|
|
//
|
|
typedef Use* op_iterator;
|
|
typedef const Use* const_op_iterator;
|
|
|
|
inline op_iterator op_begin() { return OperandList; }
|
|
inline const_op_iterator op_begin() const { return OperandList; }
|
|
inline op_iterator op_end() { return OperandList+NumOperands; }
|
|
inline const_op_iterator op_end() const { return OperandList+NumOperands; }
|
|
|
|
/// Convenience iterator for directly iterating over the Values in the
|
|
/// OperandList
|
|
class value_op_iterator : public std::iterator<std::forward_iterator_tag,
|
|
Value*> {
|
|
op_iterator OI;
|
|
public:
|
|
explicit value_op_iterator(Use *U) : OI(U) {}
|
|
|
|
bool operator==(const value_op_iterator &x) const {
|
|
return OI == x.OI;
|
|
}
|
|
bool operator!=(const value_op_iterator &x) const {
|
|
return !operator==(x);
|
|
}
|
|
|
|
/// Iterator traversal: forward iteration only
|
|
value_op_iterator &operator++() { // Preincrement
|
|
++OI;
|
|
return *this;
|
|
}
|
|
value_op_iterator operator++(int) { // Postincrement
|
|
value_op_iterator tmp = *this; ++*this; return tmp;
|
|
}
|
|
|
|
/// Retrieve a pointer to the current Value.
|
|
Value *operator*() const {
|
|
return *OI;
|
|
}
|
|
|
|
Value *operator->() const { return operator*(); }
|
|
};
|
|
|
|
inline value_op_iterator value_op_begin() {
|
|
return value_op_iterator(op_begin());
|
|
}
|
|
inline value_op_iterator value_op_end() {
|
|
return value_op_iterator(op_end());
|
|
}
|
|
|
|
// dropAllReferences() - This function is in charge of "letting go" of all
|
|
// objects that this User refers to. This allows one to
|
|
// 'delete' a whole class at a time, even though there may be circular
|
|
// references... First all references are dropped, and all use counts go to
|
|
// zero. Then everything is deleted for real. Note that no operations are
|
|
// valid on an object that has "dropped all references", except operator
|
|
// delete.
|
|
//
|
|
void dropAllReferences() {
|
|
for (op_iterator i = op_begin(), e = op_end(); i != e; ++i)
|
|
i->set(0);
|
|
}
|
|
|
|
/// replaceUsesOfWith - Replaces all references to the "From" definition with
|
|
/// references to the "To" definition.
|
|
///
|
|
void replaceUsesOfWith(Value *From, Value *To);
|
|
|
|
// Methods for support type inquiry through isa, cast, and dyn_cast:
|
|
static inline bool classof(const Value *V) {
|
|
return isa<Instruction>(V) || isa<Constant>(V);
|
|
}
|
|
};
|
|
|
|
template<> struct simplify_type<User::op_iterator> {
|
|
typedef Value* SimpleType;
|
|
static SimpleType getSimplifiedValue(User::op_iterator &Val) {
|
|
return Val->get();
|
|
}
|
|
};
|
|
template<> struct simplify_type<User::const_op_iterator> {
|
|
typedef /*const*/ Value* SimpleType;
|
|
static SimpleType getSimplifiedValue(User::const_op_iterator &Val) {
|
|
return Val->get();
|
|
}
|
|
};
|
|
|
|
// value_use_iterator::getOperandNo - Requires the definition of the User class.
|
|
template<typename UserTy>
|
|
unsigned value_use_iterator<UserTy>::getOperandNo() const {
|
|
return U - U->getUser()->op_begin();
|
|
}
|
|
|
|
} // End llvm namespace
|
|
|
|
#endif
|