CondItem(int opcode,
    Chain truejumps,
    Chain falsejumps) 
{
            super(BYTEcode);
            this.opcode = opcode;
            this.trueJumps = truejumps;
            this.falseJumps = falsejumps;
}

  void drop() 
{
            load().drop();
}

  void duplicate() 
{
            load().duplicate();
}

 boolean isFalse() 
{
            return trueJumps == null && opcode == dontgoto;
}

 boolean isTrue() 
{
            return falseJumps == null && opcode == goto_;
}

 Chain jumpFalse() 
{
            if (tree == null) return Code.mergeChains(falseJumps, code.branch(Code.negate(opcode)));
            // we should proceed further in -Xjcov mode only
            int startpc = code.curPc();
            Chain c = Code.mergeChains(falseJumps, code.branch(Code.negate(opcode)));
            code.crt.put(tree, CRTable.CRT_BRANCH_FALSE, startpc, code.curPc());
            return c;
}

 Chain jumpTrue() 
{
            if (tree == null) return Code.mergeChains(trueJumps, code.branch(opcode));
            // we should proceed further in -Xjcov mode only
            int startpc = code.curPc();
            Chain c = Code.mergeChains(trueJumps, code.branch(opcode));
            code.crt.put(tree, CRTable.CRT_BRANCH_TRUE, startpc, code.curPc());
            return c;
}

 Item load() 
{
            Chain trueChain = null;
            Chain falseChain = jumpFalse();
            if (!isFalse()) {
                code.resolve(trueJumps);
                code.emitop0(iconst_1);
                trueChain = code.branch(goto_);
            }
            if (falseChain != null) {
                code.resolve(falseChain);
                code.emitop0(iconst_0);
            }
            code.resolve(trueChain);
            return stackItem[typecode];
}

 CondItem mkCond() 
{
            return this;
}

 CondItem negate() 
{
            CondItem c = new CondItem(Code.negate(opcode), falseJumps, trueJumps);
            c.tree = tree;
            return c;
}

  void stash(int toscode) 
{
            Assert.error();
}

 public String toString() 
{
            return "cond(" + Code.mnem(opcode) + ")";
}

 int width() 
{
            // a CondItem doesn't have a size on the stack per se.
            throw new AssertionError();
}