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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2 91177308-0d34-0410-b5e6-96231b3b80d8
70 lines
2.1 KiB
C++
70 lines
2.1 KiB
C++
//===-- iBranch.cpp - Implement the Branch instruction -----------*- C++ -*--=//
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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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#ifndef NDEBUG
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#include "llvm/Type.h" // Only used for assertions...
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#include "llvm/Assembly/Writer.h"
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#endif
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BranchInst::BranchInst(BasicBlock *True, BasicBlock *False, Value *Cond)
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: TerminatorInst(Instruction::Br), TrueDest(True, this),
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FalseDest(False, this), Condition(Cond, this) {
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assert(True != 0 && "True branch destination may not be null!!!");
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#ifndef NDEBUG
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if (Cond != 0 && Cond->getType() != Type::BoolTy)
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cerr << "Bad Condition: " << Cond << endl;
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#endif
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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(const BranchInst &BI)
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: TerminatorInst(Instruction::Br), TrueDest(BI.TrueDest, this),
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FalseDest(BI.FalseDest, this), Condition(BI.Condition, this) {
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}
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void BranchInst::dropAllReferences() {
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Condition = 0;
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TrueDest = FalseDest = 0;
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}
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const Value *BranchInst::getOperand(unsigned i) const {
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return (i == 0) ? (Value*)TrueDest :
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((i == 1) ? (Value*)FalseDest :
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((i == 2) ? (Value*)Condition : 0));
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}
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const BasicBlock *BranchInst::getSuccessor(unsigned i) const {
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return (i == 0) ? (const BasicBlock*)TrueDest :
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((i == 1) ? (const BasicBlock*)FalseDest : 0);
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}
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bool BranchInst::setOperand(unsigned i, Value *Val) {
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switch (i) {
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case 0:
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assert(Val && "Can't change primary direction to 0!");
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assert(Val->getType() == Type::LabelTy);
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TrueDest = (BasicBlock*)Val;
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return true;
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case 1:
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assert(Val == 0 || Val->getType() == Type::LabelTy);
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FalseDest = (BasicBlock*)Val;
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return true;
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case 2:
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Condition = Val;
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assert(!Condition || Condition->getType() == Type::BoolTy &&
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"Condition expr must be a boolean expression!");
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return true;
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}
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return false;
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}
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