| //===-- 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/User.h" |
| #include "llvm/Constant.h" |
| #include "llvm/GlobalValue.h" |
| #include "llvm/Operator.h" |
| |
| namespace llvm { |
| |
| //===----------------------------------------------------------------------===// |
| // User Class |
| //===----------------------------------------------------------------------===// |
| |
| void User::anchor() {} |
| |
| // replaceUsesOfWith - Replaces all references to the "From" definition with |
| // references to the "To" definition. |
| // |
| 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 |