Ejemplo n.º 1
0
            private LNode GenerateIfElseChain(PredictionTree tree, LNode[] branchCode, ref LNode laVar, MSet <int> switchCases)
            {
                // From the prediction table, generate a chain of if-else
                // statements in reverse, starting with the final "else" clause.
                // Skip any branches that have been claimed for use in a switch()
                LNode ifChain  = null;
                bool  usedTest = false;

                for (int i = tree.Children.Count - 1; i >= 0; i--)
                {
                    if (switchCases.Contains(i))
                    {
                        continue;
                    }

                    if (ifChain == null)
                    {
                        ifChain = branchCode[i];
                    }
                    else
                    {
                        usedTest = true;
                        var   branch = tree.Children[i];
                        LNode test;
                        if (tree.IsAssertionLevel)
                        {
                            test = GenerateTest(branch.AndPreds, tree.Lookahead, laVar);
                        }
                        else
                        {
                            var set = CGH.Optimize(branch.Set, branch.Covered);
                            test = CGH.GenerateTest(set, laVar);
                        }

                        LNode @if = F.Call(S.If, test, branchCode[i]);
                        if (!ifChain.IsIdWithoutPAttrs(S.Missing))
                        {
                            @if = @if.PlusArg(ifChain);
                        }
                        ifChain = @if;
                    }
                }
                if (!usedTest)
                {
                    laVar = null;                     // unnecessary
                }
                return(ifChain);
            }