forked from OSchip/llvm-project
88 lines
3.2 KiB
C++
88 lines
3.2 KiB
C++
//===-- User.cpp - Implement the User class -------------------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/IR/User.h"
|
|
#include "llvm/IR/Constant.h"
|
|
#include "llvm/IR/GlobalValue.h"
|
|
#include "llvm/IR/Operator.h"
|
|
|
|
namespace llvm {
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// User Class
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
void User::anchor() {}
|
|
|
|
void User::replaceUsesOfWith(Value *From, Value *To) {
|
|
if (From == To) return; // Duh what?
|
|
|
|
assert((!isa<Constant>(this) || isa<GlobalValue>(this)) &&
|
|
"Cannot call User::replaceUsesOfWith on a constant!");
|
|
|
|
for (unsigned i = 0, E = getNumOperands(); i != E; ++i)
|
|
if (getOperand(i) == From) { // Is This operand is pointing to oldval?
|
|
// The side effects of this setOperand call include linking to
|
|
// "To", adding "this" to the uses list of To, and
|
|
// most importantly, removing "this" from the use list of "From".
|
|
setOperand(i, To); // Fix it now...
|
|
}
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// User allocHungoffUses Implementation
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
Use *User::allocHungoffUses(unsigned N) const {
|
|
// Allocate the array of Uses, followed by a pointer (with bottom bit set) to
|
|
// the User.
|
|
size_t size = N * sizeof(Use) + sizeof(Use::UserRef);
|
|
Use *Begin = static_cast<Use*>(::operator new(size));
|
|
Use *End = Begin + N;
|
|
(void) new(End) Use::UserRef(const_cast<User*>(this), 1);
|
|
return Use::initTags(Begin, End);
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// User operator new Implementations
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
void *User::operator new(size_t s, unsigned Us) {
|
|
void *Storage = ::operator new(s + sizeof(Use) * Us);
|
|
Use *Start = static_cast<Use*>(Storage);
|
|
Use *End = Start + Us;
|
|
User *Obj = reinterpret_cast<User*>(End);
|
|
Obj->OperandList = Start;
|
|
Obj->NumOperands = Us;
|
|
Use::initTags(Start, End);
|
|
return Obj;
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// User operator delete Implementation
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
void User::operator delete(void *Usr) {
|
|
User *Start = static_cast<User*>(Usr);
|
|
Use *Storage = static_cast<Use*>(Usr) - Start->NumOperands;
|
|
// If there were hung-off uses, they will have been freed already and
|
|
// NumOperands reset to 0, so here we just free the User itself.
|
|
::operator delete(Storage);
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Operator Class
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
Operator::~Operator() {
|
|
llvm_unreachable("should never destroy an Operator");
|
|
}
|
|
|
|
} // End llvm namespace
|