| //===-- iBranch.cpp - Implement the Branch instruction --------------------===// |
| // |
| // This file implements the 'br' instruction, which can represent either a |
| // conditional or unconditional branch. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "llvm/iTerminators.h" |
| #include "llvm/BasicBlock.h" |
| #include "llvm/Type.h" |
| |
| BranchInst::BranchInst(BasicBlock *True, BasicBlock *False, Value *Cond, |
| Instruction *InsertBefore) |
| : TerminatorInst(Instruction::Br, InsertBefore) { |
| assert(True != 0 && "True branch destination may not be null!!!"); |
| Operands.reserve(False ? 3 : 1); |
| Operands.push_back(Use(True, this)); |
| if (False) { |
| Operands.push_back(Use(False, this)); |
| Operands.push_back(Use(Cond, this)); |
| } |
| |
| assert(!!False == !!Cond && |
| "Either both cond and false or neither can be specified!"); |
| assert((Cond == 0 || Cond->getType() == Type::BoolTy) && |
| "May only branch on boolean predicates!!!!"); |
| } |
| |
| BranchInst::BranchInst(BasicBlock *True, Instruction *InsertBefore) |
| : TerminatorInst(Instruction::Br, InsertBefore) { |
| assert(True != 0 && "True branch destination may not be null!!!"); |
| Operands.reserve(1); |
| Operands.push_back(Use(True, this)); |
| } |
| |
| BranchInst::BranchInst(const BranchInst &BI) : TerminatorInst(Instruction::Br) { |
| Operands.reserve(BI.Operands.size()); |
| Operands.push_back(Use(BI.Operands[0], this)); |
| if (BI.Operands.size() != 1) { |
| assert(BI.Operands.size() == 3 && "BR can have 1 or 3 operands!"); |
| Operands.push_back(Use(BI.Operands[1], this)); |
| Operands.push_back(Use(BI.Operands[2], this)); |
| } |
| } |