public override void CompileBody(FunctionContext context) { var stack = 0; EndLabel = context.MakeLabel("state_end"); stack += context.Bind(context.Label); stack += context.Enter(); // jump to state label stack += context.Load(State); stack += context.JumpTable(0, _stateLabels); stack += context.Jump(EndLabel); // first state stack += context.Bind(MakeStateLabel(context)); // compile body stack += Block.Compile(context); // set enumerator.current to undefined // do this before EndLabel so we dont overwrite return values stack += context.LoadUndefined(); stack += context.Load(Enumerable); stack += context.StoreField(context.String("current")); stack += context.Bind(EndLabel); // set state to end stack += context.Load(context.Number(-1)); stack += context.Store(State); stack += context.LoadFalse(); stack += context.Return(); CheckStack(stack, 0); }
public override int Compile(FunctionContext context) { context.Position(Token); var stack = 0; var caseLabels = new List <LabelOperand>(Branches.Count); var caseEnd = context.MakeLabel("caseEnd"); LabelOperand caseDefault = null; BlockExpression defaultBlock = null; for (var i = 0; i < Branches.Count; i++) { var label = context.MakeLabel("caseBranch_" + i); caseLabels.Add(label); var conditions = Branches[i].Conditions; if (conditions.Any(c => c == null)) { caseDefault = label; if (conditions.Count == 1) { defaultBlock = Branches[i].Block; } } } var emptyDefault = caseDefault == null; if (emptyDefault) { caseDefault = context.MakeLabel("caseDefault"); } context.PushScope(); context.Statement(Expression); stack += Expression.Compile(context); var flattenedBranches = FlattenBranches(Branches, caseLabels, caseDefault); BuildTables(flattenedBranches, caseDefault, out var tables, out var rest); foreach (var table in tables) { var start = table.Entries[0].Value; var labels = table.Entries.Select(e => e.Label).ToList(); stack += context.Dup(); stack += context.JumpTable(start, labels); } foreach (var entry in rest) { stack += context.Dup(); stack += entry.Condition.Compile(context); stack += context.BinaryOperation(TokenType.EqualTo); stack += context.JumpTrue(entry.Label); } stack += context.Jump(caseDefault); context.PushLoop(null, caseEnd); for (var i = 0; i < Branches.Count; i++) { var branchStack = stack; var branch = Branches[i]; branchStack += context.Bind(caseLabels[i]); branchStack += context.Drop(); branchStack += branch.Block.Compile(context); branchStack += context.Jump(caseEnd); CheckStack(branchStack, 0); } // only bind if we need a default block if (emptyDefault || defaultBlock != null) { stack += context.Bind(caseDefault); } // always drop the switch value stack += context.Drop(); if (defaultBlock != null) { stack += defaultBlock.Compile(context); } context.PopLoop(); stack += context.Bind(caseEnd); context.PopScope(); CheckStack(stack, 0); return(stack); }
public override int Compile(FunctionContext context) { context.Line(FileName, Line); var stack = 0; var caseLabels = new List <LabelOperand>(Branches.Count); for (var i = 0; i < Branches.Count; i++) { caseLabels.Add(context.MakeLabel("caseBranch_" + i)); } var caseDefault = context.MakeLabel("caseDefault"); var caseEnd = context.MakeLabel("caseEnd"); stack += Expression.Compile(context); List <JumpTable> tables; List <JumpEntry> rest; var flattenedBranches = FlattenBranches(Branches, caseLabels); BuildTables(flattenedBranches, caseDefault, out tables, out rest); foreach (var table in tables) { var start = table.Entries[0].Value; var labels = table.Entries.Select(e => e.Label).ToList(); stack += context.Dup(); stack += context.JumpTable(start, labels); } foreach (var entry in rest) { stack += context.Dup(); stack += entry.Condition.Compile(context); stack += context.BinaryOperation(TokenType.EqualTo); stack += context.JumpTrue(entry.Label); } stack += context.Jump(caseDefault); context.PushLoop(null, caseEnd); for (var i = 0; i < Branches.Count; i++) { var branchStack = stack; var branch = Branches[i]; branchStack += context.Bind(caseLabels[i]); branchStack += context.Drop(); branchStack += branch.Block.Compile(context); branchStack += context.Jump(caseEnd); CheckStack(branchStack, 0); } stack += context.Bind(caseDefault); stack += context.Drop(); if (DefaultBlock != null) { stack += DefaultBlock.Compile(context); } context.PopLoop(); stack += context.Bind(caseEnd); CheckStack(stack, 0); return(stack); }