| //===-- iSwitch.cpp - Implement the Switch instruction --------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file was developed by the LLVM research group and is distributed under |
| // the University of Illinois Open Source License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements the Switch instruction... |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "llvm/iTerminators.h" |
| #include "llvm/BasicBlock.h" |
| using namespace llvm; |
| |
| SwitchInst::SwitchInst(Value *V, BasicBlock *DefaultDest, |
| Instruction *InsertBefore) |
| : TerminatorInst(Instruction::Switch, InsertBefore) { |
| assert(V && DefaultDest); |
| Operands.push_back(Use(V, this)); |
| Operands.push_back(Use(DefaultDest, this)); |
| } |
| |
| SwitchInst::SwitchInst(Value *V, BasicBlock *DefaultDest, |
| BasicBlock *InsertAtEnd) |
| : TerminatorInst(Instruction::Switch, InsertAtEnd) { |
| assert(V && DefaultDest); |
| Operands.push_back(Use(V, this)); |
| Operands.push_back(Use(DefaultDest, this)); |
| } |
| |
| SwitchInst::SwitchInst(const SwitchInst &SI) |
| : TerminatorInst(Instruction::Switch) { |
| Operands.reserve(SI.Operands.size()); |
| |
| for (unsigned i = 0, E = SI.Operands.size(); i != E; i+=2) { |
| Operands.push_back(Use(SI.Operands[i], this)); |
| Operands.push_back(Use(SI.Operands[i+1], this)); |
| } |
| } |
| |
| /// addCase - Add an entry to the switch instruction... |
| /// |
| void SwitchInst::addCase(Constant *OnVal, BasicBlock *Dest) { |
| Operands.push_back(Use((Value*)OnVal, this)); |
| Operands.push_back(Use((Value*)Dest, this)); |
| } |
| |
| /// removeCase - This method removes the specified successor from the switch |
| /// instruction. Note that this cannot be used to remove the default |
| /// destination (successor #0). |
| /// |
| void SwitchInst::removeCase(unsigned idx) { |
| assert(idx != 0 && "Cannot remove the default case!"); |
| assert(idx*2 < Operands.size() && "Successor index out of range!!!"); |
| Operands.erase(Operands.begin()+idx*2, Operands.begin()+(idx+1)*2); |
| } |