1 //===-- iSwitch.cpp - Implement the Switch instruction --------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the Switch instruction...
12 //===----------------------------------------------------------------------===//
14 #include "llvm/iTerminators.h"
15 #include "llvm/BasicBlock.h"
18 void SwitchInst::init(Value *Value, BasicBlock *Default)
20 assert(Value && Default);
21 Operands.push_back(Use(Value, this));
22 Operands.push_back(Use(Default, this));
25 SwitchInst::SwitchInst(Value *V, BasicBlock *D,
26 Instruction *InsertBefore)
27 : TerminatorInst(Instruction::Switch, InsertBefore) {
31 SwitchInst::SwitchInst(Value *V, BasicBlock *D, BasicBlock *InsertAtEnd)
32 : TerminatorInst(Instruction::Switch, InsertAtEnd) {
36 SwitchInst::SwitchInst(const SwitchInst &SI)
37 : TerminatorInst(Instruction::Switch) {
38 Operands.reserve(SI.Operands.size());
40 for (unsigned i = 0, E = SI.Operands.size(); i != E; i+=2) {
41 Operands.push_back(Use(SI.Operands[i], this));
42 Operands.push_back(Use(SI.Operands[i+1], this));
46 /// addCase - Add an entry to the switch instruction...
48 void SwitchInst::addCase(Constant *OnVal, BasicBlock *Dest) {
49 Operands.push_back(Use((Value*)OnVal, this));
50 Operands.push_back(Use((Value*)Dest, this));
53 /// removeCase - This method removes the specified successor from the switch
54 /// instruction. Note that this cannot be used to remove the default
55 /// destination (successor #0).
57 void SwitchInst::removeCase(unsigned idx) {
58 assert(idx != 0 && "Cannot remove the default case!");
59 assert(idx*2 < Operands.size() && "Successor index out of range!!!");
60 Operands.erase(Operands.begin()+idx*2, Operands.begin()+(idx+1)*2);