llvm-6502/lib/VMCore/iBranch.cpp
Chris Lattner c8b25d40cb Changed the fundemental architecture of Operands for Instructions. Now
Operands are maintained as a vector<Use> in the User class, and operator
iterators are provided as before.  Getting an operand no longer requires
a virtual function call.

WARNING: getOperand(x) where x >= getNumOperands() will now assert instead
of returning null!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@149 91177308-0d34-0410-b5e6-96231b3b80d8
2001-07-07 08:36:50 +00:00

45 lines
1.5 KiB
C++

//===-- iBranch.cpp - Implement the Branch instruction -----------*- C++ -*--=//
//
// This file implements the 'br' instruction, which can represent either a
// conditional or unconditional branch.
//
//===----------------------------------------------------------------------===//
#include "llvm/iTerminators.h"
#include "llvm/BasicBlock.h"
#ifndef NDEBUG
#include "llvm/Type.h" // Only used for assertions...
#include "llvm/Assembly/Writer.h"
#endif
BranchInst::BranchInst(BasicBlock *True, BasicBlock *False, Value *Cond)
: TerminatorInst(Instruction::Br) {
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!");
#ifndef NDEBUG
if (Cond != 0 && Cond->getType() != Type::BoolTy)
cerr << "Bad Condition: " << Cond << endl;
#endif
assert((Cond == 0 || Cond->getType() == Type::BoolTy) &&
"May only branch on boolean predicates!!!!");
}
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));
}
}