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88 lines
3.2 KiB
C++
88 lines
3.2 KiB
C++
//===-- iBranch.cpp - Implement the Branch instruction --------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the 'br' instruction, which can represent either a
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// conditional or unconditional branch.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/iTerminators.h"
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#include "llvm/BasicBlock.h"
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#include "llvm/Type.h"
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using namespace llvm;
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// Out-of-line ReturnInst method, put here so the C++ compiler can choose to
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// emit the vtable for the class in this translation unit.
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void ReturnInst::setSuccessor(unsigned idx, BasicBlock *NewSucc) {
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assert(0 && "ReturnInst has no successors!");
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}
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// Likewise for UnwindInst
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void UnwindInst::setSuccessor(unsigned idx, BasicBlock *NewSucc) {
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assert(0 && "UnwindInst has no successors!");
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}
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BranchInst::BranchInst(BasicBlock *True, BasicBlock *False, Value *Cond,
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Instruction *InsertBefore)
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: TerminatorInst(Instruction::Br, InsertBefore) {
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assert(True != 0 && "True branch destination may not be null!!!");
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Operands.reserve(False ? 3 : 1);
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Operands.push_back(Use(True, this));
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if (False) {
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Operands.push_back(Use(False, this));
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Operands.push_back(Use(Cond, this));
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}
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assert(!!False == !!Cond &&
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"Either both cond and false or neither can be specified!");
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assert((Cond == 0 || Cond->getType() == Type::BoolTy) &&
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"May only branch on boolean predicates!!!!");
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}
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BranchInst::BranchInst(BasicBlock *True, BasicBlock *False, Value *Cond,
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BasicBlock *InsertAtEnd)
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: TerminatorInst(Instruction::Br, InsertAtEnd) {
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assert(True != 0 && "True branch destination may not be null!!!");
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Operands.reserve(False ? 3 : 1);
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Operands.push_back(Use(True, this));
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if (False) {
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Operands.push_back(Use(False, this));
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Operands.push_back(Use(Cond, this));
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}
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assert(!!False == !!Cond &&
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"Either both cond and false or neither can be specified!");
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assert((Cond == 0 || Cond->getType() == Type::BoolTy) &&
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"May only branch on boolean predicates!!!!");
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}
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BranchInst::BranchInst(BasicBlock *True, Instruction *InsertBefore)
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: TerminatorInst(Instruction::Br, InsertBefore) {
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assert(True != 0 && "True branch destination may not be null!!!");
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Operands.reserve(1);
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Operands.push_back(Use(True, this));
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}
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BranchInst::BranchInst(BasicBlock *True, BasicBlock *InsertAtEnd)
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: TerminatorInst(Instruction::Br, InsertAtEnd) {
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assert(True != 0 && "True branch destination may not be null!!!");
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Operands.reserve(1);
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Operands.push_back(Use(True, this));
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}
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BranchInst::BranchInst(const BranchInst &BI) : TerminatorInst(Instruction::Br) {
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Operands.reserve(BI.Operands.size());
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Operands.push_back(Use(BI.Operands[0], this));
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if (BI.Operands.size() != 1) {
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assert(BI.Operands.size() == 3 && "BR can have 1 or 3 operands!");
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Operands.push_back(Use(BI.Operands[1], this));
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Operands.push_back(Use(BI.Operands[2], this));
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}
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}
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