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80 lines
3.0 KiB
C++
80 lines
3.0 KiB
C++
//===-- User.cpp - Implement the User class -------------------------------===//
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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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#include "llvm/Constant.h"
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#include "llvm/GlobalValue.h"
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#include "llvm/User.h"
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namespace llvm {
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//===----------------------------------------------------------------------===//
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// User Class
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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 User::replaceUsesOfWith(Value *From, Value *To) {
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if (From == To) return; // Duh what?
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assert((!isa<Constant>(this) || isa<GlobalValue>(this)) &&
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"Cannot call User::replaceUsesOfWith on a constant!");
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for (unsigned i = 0, E = getNumOperands(); i != E; ++i)
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if (getOperand(i) == From) { // Is This operand is pointing to oldval?
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// The side effects of this setOperand call include linking to
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// "To", adding "this" to the uses list of To, and
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// most importantly, removing "this" from the use list of "From".
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setOperand(i, To); // Fix it now...
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}
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}
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//===----------------------------------------------------------------------===//
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// User allocHungoffUses Implementation
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//===----------------------------------------------------------------------===//
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Use *User::allocHungoffUses(unsigned N) const {
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// Allocate the array of Uses, followed by a pointer (with bottom bit set) to
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// the User.
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size_t size = N * sizeof(Use) + sizeof(Use::UserRef);
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Use *Begin = static_cast<Use*>(::operator new(size));
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Use *End = Begin + N;
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(void) new(End) Use::UserRef(const_cast<User*>(this), 1);
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return Use::initTags(Begin, End);
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}
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//===----------------------------------------------------------------------===//
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// User operator new Implementations
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//===----------------------------------------------------------------------===//
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void *User::operator new(size_t s, unsigned Us) {
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void *Storage = ::operator new(s + sizeof(Use) * Us);
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Use *Start = static_cast<Use*>(Storage);
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Use *End = Start + Us;
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User *Obj = reinterpret_cast<User*>(End);
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Obj->OperandList = Start;
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Obj->NumOperands = Us;
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Use::initTags(Start, End);
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return Obj;
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}
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//===----------------------------------------------------------------------===//
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// User operator delete Implementation
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//===----------------------------------------------------------------------===//
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void User::operator delete(void *Usr) {
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User *Start = static_cast<User*>(Usr);
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Use *Storage = static_cast<Use*>(Usr) - Start->NumOperands;
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// If there were hung-off uses, they will have been freed already and
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// NumOperands reset to 0, so here we just free the User itself.
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::operator delete(Storage);
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}
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} // End llvm namespace
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