1249259Sdim//===-- User.cpp - Implement the User class -------------------------------===// 2249259Sdim// 3249259Sdim// The LLVM Compiler Infrastructure 4249259Sdim// 5249259Sdim// This file is distributed under the University of Illinois Open Source 6249259Sdim// License. See LICENSE.TXT for details. 7249259Sdim// 8249259Sdim//===----------------------------------------------------------------------===// 9249259Sdim 10249259Sdim#include "llvm/IR/User.h" 11249259Sdim#include "llvm/IR/Constant.h" 12249259Sdim#include "llvm/IR/GlobalValue.h" 13249259Sdim#include "llvm/IR/Operator.h" 14249259Sdim 15249259Sdimnamespace llvm { 16249259Sdim 17249259Sdim//===----------------------------------------------------------------------===// 18249259Sdim// User Class 19249259Sdim//===----------------------------------------------------------------------===// 20249259Sdim 21249259Sdimvoid User::anchor() {} 22249259Sdim 23249259Sdim// replaceUsesOfWith - Replaces all references to the "From" definition with 24249259Sdim// references to the "To" definition. 25249259Sdim// 26249259Sdimvoid User::replaceUsesOfWith(Value *From, Value *To) { 27249259Sdim if (From == To) return; // Duh what? 28249259Sdim 29249259Sdim assert((!isa<Constant>(this) || isa<GlobalValue>(this)) && 30249259Sdim "Cannot call User::replaceUsesOfWith on a constant!"); 31249259Sdim 32249259Sdim for (unsigned i = 0, E = getNumOperands(); i != E; ++i) 33249259Sdim if (getOperand(i) == From) { // Is This operand is pointing to oldval? 34249259Sdim // The side effects of this setOperand call include linking to 35249259Sdim // "To", adding "this" to the uses list of To, and 36249259Sdim // most importantly, removing "this" from the use list of "From". 37249259Sdim setOperand(i, To); // Fix it now... 38249259Sdim } 39249259Sdim} 40249259Sdim 41249259Sdim//===----------------------------------------------------------------------===// 42249259Sdim// User allocHungoffUses Implementation 43249259Sdim//===----------------------------------------------------------------------===// 44249259Sdim 45249259SdimUse *User::allocHungoffUses(unsigned N) const { 46249259Sdim // Allocate the array of Uses, followed by a pointer (with bottom bit set) to 47249259Sdim // the User. 48249259Sdim size_t size = N * sizeof(Use) + sizeof(Use::UserRef); 49249259Sdim Use *Begin = static_cast<Use*>(::operator new(size)); 50249259Sdim Use *End = Begin + N; 51249259Sdim (void) new(End) Use::UserRef(const_cast<User*>(this), 1); 52249259Sdim return Use::initTags(Begin, End); 53249259Sdim} 54249259Sdim 55249259Sdim//===----------------------------------------------------------------------===// 56249259Sdim// User operator new Implementations 57249259Sdim//===----------------------------------------------------------------------===// 58249259Sdim 59249259Sdimvoid *User::operator new(size_t s, unsigned Us) { 60249259Sdim void *Storage = ::operator new(s + sizeof(Use) * Us); 61249259Sdim Use *Start = static_cast<Use*>(Storage); 62249259Sdim Use *End = Start + Us; 63249259Sdim User *Obj = reinterpret_cast<User*>(End); 64249259Sdim Obj->OperandList = Start; 65249259Sdim Obj->NumOperands = Us; 66249259Sdim Use::initTags(Start, End); 67249259Sdim return Obj; 68249259Sdim} 69249259Sdim 70249259Sdim//===----------------------------------------------------------------------===// 71249259Sdim// User operator delete Implementation 72249259Sdim//===----------------------------------------------------------------------===// 73249259Sdim 74249259Sdimvoid User::operator delete(void *Usr) { 75249259Sdim User *Start = static_cast<User*>(Usr); 76249259Sdim Use *Storage = static_cast<Use*>(Usr) - Start->NumOperands; 77249259Sdim // If there were hung-off uses, they will have been freed already and 78249259Sdim // NumOperands reset to 0, so here we just free the User itself. 79249259Sdim ::operator delete(Storage); 80249259Sdim} 81249259Sdim 82249259Sdim//===----------------------------------------------------------------------===// 83249259Sdim// Operator Class 84249259Sdim//===----------------------------------------------------------------------===// 85249259Sdim 86249259SdimOperator::~Operator() { 87249259Sdim llvm_unreachable("should never destroy an Operator"); 88249259Sdim} 89249259Sdim 90249259Sdim} // End llvm namespace 91