public override void VisitBoxInstruction(BoxInstruction instruction)
{
var cilType = instruction.TypeSpec.GetCilType(_program);
ControlState.EvaluationStack.PopValue(_program, cilType, out var val);
CilObject obj = null;
if (cilType.IsValueType(_program) && !cilType.IsNullable)
{
obj = val.Box();
}
var objRef = ManagedMemory.Store(obj);
ControlState.EvaluationStack.PushValue(objRef);
ControlState.MoveToNextInstruction();
}
public override CILInstructionType BuildNode(ParseTreeNode node)
{
var instrTypeParseTreeNode = node.GetFirstChildWithGrammarName(GrammarNames.INSTR_TYPE);
CILInstructionType result = null;
var boxParseTreeNode = instrTypeParseTreeNode?.GetFirstChildWithGrammarName(GrammarNames.keyword_box);
if (boxParseTreeNode != null)
{
result = new BoxInstruction();
}
var newarrParseTreeNode = instrTypeParseTreeNode?.GetFirstChildWithGrammarName(GrammarNames.keyword_newarr);
if (newarrParseTreeNode != null)
{
result = new NewArrayInstruction();
}
var unboxanyParseTreeNode = instrTypeParseTreeNode?.GetFirstChildWithGrammarName(GrammarNames.keyword_unboxany);
if (unboxanyParseTreeNode != null)
{
result = new UnboxAnyInstruction();
}
if (result != null)
{
var typeSpecParseTreeNode = node.GetFirstChildWithGrammarName(GrammarNames.typeSpec);
result.TypeSpecification = TypeSpecParseTreeNodeHelper.GetValue(typeSpecParseTreeNode);
return(result);
}
throw new ArgumentException("Cannot recognize CIL instruction type.");
}
public abstract void VisitBoxInstruction(BoxInstruction instruction);
