You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
389 lines
17 KiB
389 lines
17 KiB
using System;
|
|
using System.Collections.Generic;
|
|
using System.Linq;
|
|
using System.Text;
|
|
using System.Linq.Expressions;
|
|
using System.Reflection;
|
|
|
|
namespace Net3_Proxy
|
|
{
|
|
public static class ExpressionEx
|
|
{
|
|
internal static ExpressionType ExprT(this ExpressionTypeEx ex)
|
|
=> (ExpressionType)ex;
|
|
internal static ExpressionTypeEx ExprTEx(this ExpressionType ex)
|
|
=> (ExpressionTypeEx)ex;
|
|
|
|
private static void Validate(Type type, bool allowByRef)
|
|
{
|
|
if (type == null)
|
|
throw new ArgumentNullException(nameof(type));
|
|
TypeUtils.ValidateType(type, nameof(type), allowByRef, false);
|
|
if (type == typeof(void))
|
|
throw new ArgumentException("Argument cannot be of type void", nameof(type));
|
|
}
|
|
|
|
private static void RequiresCanWrite(Expression expression, string paramName)
|
|
{
|
|
if (expression == null)
|
|
{
|
|
throw new ArgumentNullException(paramName);
|
|
}
|
|
ExpressionType nodeType = expression.NodeType;
|
|
if (nodeType != ExpressionType.MemberAccess)
|
|
{
|
|
if (nodeType == ExpressionType.Parameter)
|
|
return;
|
|
}
|
|
else
|
|
{
|
|
MemberInfo member = ((MemberExpression)expression).Member;
|
|
if (member is PropertyInfo propertyInfo)
|
|
{
|
|
if (propertyInfo.CanWrite)
|
|
{
|
|
return;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
FieldInfo fieldInfo = (FieldInfo)member;
|
|
if (!fieldInfo.IsInitOnly && !fieldInfo.IsLiteral)
|
|
{
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
throw new ArgumentException("Expression must be writeable", paramName);
|
|
}
|
|
|
|
public static void RequiresCanRead(Expression expression, string paramName, int idx = -1)
|
|
{
|
|
if (expression == null)
|
|
throw new ArgumentNullException(TypeUtils.GetParamName(paramName, idx));
|
|
ExpressionType nodeType = expression.NodeType;
|
|
if (nodeType == ExpressionType.MemberAccess)
|
|
{
|
|
if (((MemberExpression)expression).Member is PropertyInfo propertyInfo && !propertyInfo.CanRead)
|
|
{
|
|
throw new ArgumentException("Expression must be readable", TypeUtils.GetParamName(paramName, idx));
|
|
}
|
|
}
|
|
}
|
|
|
|
public static VariableExpression Variable(Type type, string name = null)
|
|
{
|
|
Validate(type, false);
|
|
return new VariableExpression(type, name);
|
|
}
|
|
|
|
public static AssignExpression Assign(Expression left, Expression right)
|
|
{
|
|
RequiresCanWrite(left, nameof(left));
|
|
RequiresCanRead(right, nameof(right));
|
|
TypeUtils.ValidateType(left.Type, nameof(left), true, true);
|
|
TypeUtils.ValidateType(right.Type, nameof(right), true, true);
|
|
if (!TypeUtils.AreReferenceAssignable(left.Type, right.Type))
|
|
throw new ArgumentException($"Expression of type '{left.Type}' cannot be used for assignment to type '{right.Type}'");
|
|
if (left.NodeType.ExprTEx() != ExpressionTypeEx.Variable)
|
|
throw new NotSupportedException("Non-variable left hand operands to assignment is currently not supported");
|
|
return new AssignExpression(left, right);
|
|
}
|
|
|
|
public static Expression Block(IEnumerable<VariableExpression> vars, params Expression[] body) => Block(vars, body);
|
|
public static Expression Block(IEnumerable<VariableExpression> vars, IEnumerable<Expression> body)
|
|
{ // this is probably terrible performance-wise when executing, but i'm not giving up BlockExpression damnit!
|
|
var varSet = new HashSet<VariableExpression>(vars);
|
|
var bodyArr = body.ToArray();
|
|
var finalExprList = new Stack<(List<Expression> list, BlockParseStackInfo info)>();
|
|
var remaining = bodyArr.Length;
|
|
|
|
var varParams = new Dictionary<VariableExpression, ParameterExpression>(varSet.Count);
|
|
|
|
finalExprList.Push((new List<Expression>(remaining), default(BlockParseStackInfo)));
|
|
|
|
while (remaining > 0)
|
|
{
|
|
var (list, info) = finalExprList.Pop();
|
|
var targetExpr = bodyArr[bodyArr.Length - remaining--];
|
|
|
|
if (targetExpr.NodeType.ExprTEx() == ExpressionTypeEx.Assign)
|
|
{
|
|
var assign = (AssignExpression)targetExpr;
|
|
var left = (VariableExpression)assign.Left;
|
|
var right = assign.Right;
|
|
|
|
var param = Expression.Parameter(left.Type, left.Name);
|
|
|
|
finalExprList.Push((list, info));
|
|
finalExprList.Push((new List<Expression>(remaining), new BlockParseStackInfo
|
|
{
|
|
ValueExpr = BlockVisitReplaceVariables(right, varParams), Param = param
|
|
}));
|
|
|
|
varParams.Add(left, param);
|
|
continue;
|
|
}
|
|
|
|
list.Add(BlockVisitReplaceVariables(targetExpr, varParams));
|
|
finalExprList.Push((list, info));
|
|
}
|
|
|
|
var funcType = typeof(Func<>);
|
|
Expression topExpr = null;
|
|
|
|
while (finalExprList.Count > 0)
|
|
{
|
|
var (list, info) = finalExprList.Pop();
|
|
// there is an optimization opportunity for consecutive assignments, but it needs to make sure they don't depend on each other
|
|
if (topExpr != null) list.Add(topExpr);
|
|
|
|
|
|
Expression last = null;
|
|
Type lastType = null;
|
|
var rest = new List<Expression<Action>>(list.Count);
|
|
|
|
if (list.Count == 0)
|
|
list.Add(info.Param);
|
|
|
|
for (int i = 0; i < list.Count; i++)
|
|
{
|
|
var expr = list[i];
|
|
if (i + 1 == list.Count)
|
|
{
|
|
var ty = expr.Type;
|
|
if (ty == typeof(void))
|
|
rest.Add(Expression.Lambda<Action>(expr));
|
|
else
|
|
{
|
|
lastType = ty;
|
|
var func = funcType.MakeGenericType(ty);
|
|
last = Expression.Lambda(func, expr);
|
|
}
|
|
}
|
|
else
|
|
rest.Add(Expression.Lambda<Action>(expr));
|
|
}
|
|
|
|
Expression topBody;
|
|
if (lastType != null)
|
|
{
|
|
var execSeq = ExecuteSequenceTyped.MakeGenericMethod(lastType);
|
|
topBody = Expression.Call(null, execSeq, last, Expression.NewArrayInit(typeof(Action), rest.Cast<Expression>()));
|
|
}
|
|
else
|
|
topBody = Expression.Call(null, ExecuteSequenceVoid, Expression.NewArrayInit(typeof(Action), rest.Cast<Expression>()));
|
|
|
|
if (info.Param != null && info.ValueExpr != null)
|
|
topExpr = Expression.Invoke(Expression.Lambda(topBody, info.Param), info.ValueExpr);
|
|
else
|
|
topExpr = topBody;
|
|
}
|
|
|
|
return topExpr;
|
|
}
|
|
|
|
/*
|
|
* {
|
|
* Console.WriteLine("ho");
|
|
* int i = 3;
|
|
* Console.WriteLine(i);
|
|
* i // return last
|
|
* }
|
|
*
|
|
* ExecuteSequence<int>(
|
|
* () => (i =>
|
|
* ExecuteSequence<int>(
|
|
* () => i,
|
|
* () => Console.WriteLine(i)
|
|
* )
|
|
* )(3),
|
|
* () => Console.WriteLine("ho")
|
|
* )
|
|
*/
|
|
|
|
private struct BlockParseStackInfo
|
|
{
|
|
public Expression ValueExpr;
|
|
public ParameterExpression Param;
|
|
}
|
|
|
|
private static Expression BlockVisitReplaceVariables(Expression expr, Dictionary<VariableExpression, ParameterExpression> mapping)
|
|
{
|
|
var binary = expr as BinaryExpression;
|
|
var unary = expr as UnaryExpression;
|
|
switch (expr.NodeType)
|
|
{
|
|
case ExpressionType.Add:
|
|
return Expression.Add(BlockVisitReplaceVariables(binary.Left, mapping), BlockVisitReplaceVariables(binary.Right, mapping));
|
|
case ExpressionType.AddChecked:
|
|
return Expression.AddChecked(BlockVisitReplaceVariables(binary.Left, mapping), BlockVisitReplaceVariables(binary.Right, mapping));
|
|
case ExpressionType.And:
|
|
return Expression.And(BlockVisitReplaceVariables(binary.Left, mapping), BlockVisitReplaceVariables(binary.Right, mapping));
|
|
case ExpressionType.AndAlso:
|
|
return Expression.AndAlso(BlockVisitReplaceVariables(binary.Left, mapping), BlockVisitReplaceVariables(binary.Right, mapping));
|
|
case ExpressionType.ArrayIndex:
|
|
return Expression.ArrayIndex(BlockVisitReplaceVariables(binary.Left, mapping), BlockVisitReplaceVariables(binary.Right, mapping));
|
|
case ExpressionType.Coalesce:
|
|
return Expression.Coalesce(BlockVisitReplaceVariables(binary.Left, mapping), BlockVisitReplaceVariables(binary.Right, mapping));
|
|
case ExpressionType.Divide:
|
|
return Expression.Divide(BlockVisitReplaceVariables(binary.Left, mapping), BlockVisitReplaceVariables(binary.Right, mapping));
|
|
case ExpressionType.Equal:
|
|
return Expression.Equal(BlockVisitReplaceVariables(binary.Left, mapping), BlockVisitReplaceVariables(binary.Right, mapping));
|
|
case ExpressionType.ExclusiveOr:
|
|
return Expression.ExclusiveOr(BlockVisitReplaceVariables(binary.Left, mapping), BlockVisitReplaceVariables(binary.Right, mapping));
|
|
case ExpressionType.GreaterThan:
|
|
return Expression.GreaterThan(BlockVisitReplaceVariables(binary.Left, mapping), BlockVisitReplaceVariables(binary.Right, mapping));
|
|
case ExpressionType.GreaterThanOrEqual:
|
|
return Expression.GreaterThanOrEqual(BlockVisitReplaceVariables(binary.Left, mapping), BlockVisitReplaceVariables(binary.Right, mapping));
|
|
case ExpressionType.LeftShift:
|
|
return Expression.LeftShift(BlockVisitReplaceVariables(binary.Left, mapping), BlockVisitReplaceVariables(binary.Right, mapping));
|
|
case ExpressionType.LessThan:
|
|
return Expression.LessThan(BlockVisitReplaceVariables(binary.Left, mapping), BlockVisitReplaceVariables(binary.Right, mapping));
|
|
case ExpressionType.LessThanOrEqual:
|
|
return Expression.LessThanOrEqual(BlockVisitReplaceVariables(binary.Left, mapping), BlockVisitReplaceVariables(binary.Right, mapping));
|
|
case ExpressionType.Modulo:
|
|
return Expression.Modulo(BlockVisitReplaceVariables(binary.Left, mapping), BlockVisitReplaceVariables(binary.Right, mapping));
|
|
case ExpressionType.Multiply:
|
|
return Expression.Multiply(BlockVisitReplaceVariables(binary.Left, mapping), BlockVisitReplaceVariables(binary.Right, mapping));
|
|
case ExpressionType.MultiplyChecked:
|
|
return Expression.MultiplyChecked(BlockVisitReplaceVariables(binary.Left, mapping), BlockVisitReplaceVariables(binary.Right, mapping));
|
|
case ExpressionType.NotEqual:
|
|
return Expression.NotEqual(BlockVisitReplaceVariables(binary.Left, mapping), BlockVisitReplaceVariables(binary.Right, mapping));
|
|
case ExpressionType.Or:
|
|
return Expression.Or(BlockVisitReplaceVariables(binary.Left, mapping), BlockVisitReplaceVariables(binary.Right, mapping));
|
|
case ExpressionType.OrElse:
|
|
return Expression.OrElse(BlockVisitReplaceVariables(binary.Left, mapping), BlockVisitReplaceVariables(binary.Right, mapping));
|
|
case ExpressionType.Power:
|
|
return Expression.Power(BlockVisitReplaceVariables(binary.Left, mapping), BlockVisitReplaceVariables(binary.Right, mapping));
|
|
case ExpressionType.RightShift:
|
|
return Expression.RightShift(BlockVisitReplaceVariables(binary.Left, mapping), BlockVisitReplaceVariables(binary.Right, mapping));
|
|
case ExpressionType.Subtract:
|
|
return Expression.Subtract(BlockVisitReplaceVariables(binary.Left, mapping), BlockVisitReplaceVariables(binary.Right, mapping));
|
|
case ExpressionType.SubtractChecked:
|
|
return Expression.SubtractChecked(BlockVisitReplaceVariables(binary.Left, mapping), BlockVisitReplaceVariables(binary.Right, mapping));
|
|
case ExpressionType.ArrayLength:
|
|
return Expression.ArrayLength(BlockVisitReplaceVariables(unary.Operand, mapping));
|
|
case ExpressionType.Negate:
|
|
return Expression.Negate(BlockVisitReplaceVariables(unary.Operand, mapping));
|
|
case ExpressionType.UnaryPlus:
|
|
return Expression.UnaryPlus(BlockVisitReplaceVariables(unary.Operand, mapping));
|
|
case ExpressionType.NegateChecked:
|
|
return Expression.NegateChecked(BlockVisitReplaceVariables(unary.Operand, mapping));
|
|
case ExpressionType.Not:
|
|
return Expression.Not(BlockVisitReplaceVariables(unary.Operand, mapping));
|
|
case ExpressionType.TypeAs:
|
|
return Expression.TypeAs(BlockVisitReplaceVariables(unary.Operand, mapping), unary.Type);
|
|
case ExpressionType.Call:
|
|
var callExpr = expr as MethodCallExpression;
|
|
return Expression.Call(BlockVisitReplaceVariables(callExpr.Object, mapping),
|
|
callExpr.Method, callExpr.Arguments.Select(a => BlockVisitReplaceVariables(a, mapping)));
|
|
case ExpressionType.Conditional:
|
|
var condExpr = expr as ConditionalExpression;
|
|
return Expression.Condition(BlockVisitReplaceVariables(condExpr.Test, mapping),
|
|
BlockVisitReplaceVariables(condExpr.IfTrue, mapping), BlockVisitReplaceVariables(condExpr.IfFalse, mapping));
|
|
case ExpressionType.Constant: return expr; // constants should be unchanged
|
|
case ExpressionType.Convert:
|
|
return Expression.Convert(BlockVisitReplaceVariables(unary.Operand, mapping), unary.Type, unary.Method);
|
|
case ExpressionType.ConvertChecked:
|
|
return Expression.ConvertChecked(BlockVisitReplaceVariables(unary.Operand, mapping), unary.Type, unary.Method);
|
|
case ExpressionType.Invoke:
|
|
var invokeExpr = expr as InvocationExpression;
|
|
return Expression.Invoke(BlockVisitReplaceVariables(invokeExpr.Expression, mapping),
|
|
invokeExpr.Arguments.Select(e => BlockVisitReplaceVariables(e, mapping)));
|
|
case ExpressionType.Lambda:
|
|
var lambdaExpr = expr as LambdaExpression;
|
|
return Expression.Lambda(lambdaExpr.Type, BlockVisitReplaceVariables(lambdaExpr.Body, mapping), lambdaExpr.Parameters);
|
|
case ExpressionType.ListInit:
|
|
var listInitExpr = expr as ListInitExpression;
|
|
return Expression.ListInit((NewExpression)BlockVisitReplaceVariables(listInitExpr.NewExpression, mapping),
|
|
listInitExpr.Initializers.Select(i => i.AddMethod).First(),
|
|
listInitExpr.Initializers.SelectMany(i => i.Arguments)
|
|
.Select(e => BlockVisitReplaceVariables(e, mapping)));
|
|
case ExpressionType.MemberAccess:
|
|
var memberExpr = expr as MemberExpression;
|
|
return Expression.MakeMemberAccess(BlockVisitReplaceVariables(memberExpr.Expression, mapping), memberExpr.Member);
|
|
case ExpressionType.MemberInit:
|
|
var memberInitExpr = expr as MemberInitExpression;
|
|
return Expression.MemberInit((NewExpression)BlockVisitReplaceVariables(memberInitExpr.NewExpression, mapping),
|
|
memberInitExpr.Bindings);
|
|
case ExpressionType.New:
|
|
var newExpr = expr as NewExpression;
|
|
return Expression.New(newExpr.Constructor,
|
|
newExpr.Arguments.Select(e => BlockVisitReplaceVariables(e, mapping)),
|
|
newExpr.Members);
|
|
case ExpressionType.NewArrayInit:
|
|
var newArrayInitExpr = expr as NewArrayExpression;
|
|
return Expression.NewArrayInit(newArrayInitExpr.Type,
|
|
newArrayInitExpr.Expressions.Select(e => BlockVisitReplaceVariables(e, mapping)));
|
|
case ExpressionType.NewArrayBounds:
|
|
var newArrayBoundsExpr = expr as NewArrayExpression;
|
|
return Expression.NewArrayBounds(newArrayBoundsExpr.Type,
|
|
newArrayBoundsExpr.Expressions.Select(e => BlockVisitReplaceVariables(e, mapping)));
|
|
case ExpressionType.Parameter: return expr; // like constant
|
|
case ExpressionType.Quote:
|
|
return Expression.Quote(BlockVisitReplaceVariables(unary.Operand, mapping));
|
|
case ExpressionType.TypeIs:
|
|
var typeIsExpr = expr as TypeBinaryExpression;
|
|
return Expression.TypeIs(BlockVisitReplaceVariables(typeIsExpr.Expression, mapping), typeIsExpr.TypeOperand);
|
|
default:
|
|
switch (expr.NodeType.ExprTEx())
|
|
{
|
|
case ExpressionTypeEx.Variable:
|
|
var varExpr = expr as VariableExpression;
|
|
if (mapping.TryGetValue(varExpr, out var paramExpr))
|
|
return paramExpr;
|
|
else
|
|
return varExpr; // not in scope in the current context, might be later
|
|
case ExpressionTypeEx.Assign:
|
|
throw new InvalidOperationException("Assign expression must appear directly inside a block expression");
|
|
default:
|
|
throw new ArgumentException($"Unhandled expression type '{expr.NodeType}'");
|
|
}
|
|
}
|
|
}
|
|
|
|
private static readonly MethodInfo ExecuteSequenceVoid = typeof(ExpressionEx).GetMethod(nameof(ExecuteSequence),
|
|
BindingFlags.Static | BindingFlags.NonPublic, null, new[] { typeof(Action[]) }, null);
|
|
private static void ExecuteSequence(params Action[] exec)
|
|
{
|
|
foreach (var act in exec) act();
|
|
}
|
|
private static readonly MethodInfo ExecuteSequenceTyped = typeof(ExpressionEx).GetMethod(nameof(ExecuteSequence),
|
|
BindingFlags.Static | BindingFlags.NonPublic, null, new[] { typeof(Func<>), typeof(Action[]) }, null);
|
|
private static T ExecuteSequence<T>(Func<T> last, params Action[] first)
|
|
{
|
|
ExecuteSequence(first);
|
|
return last();
|
|
}
|
|
}
|
|
|
|
internal enum ExpressionTypeEx
|
|
{
|
|
Variable = 46,
|
|
Assign = 47
|
|
}
|
|
|
|
public class VariableExpression : Expression, IEquatable<VariableExpression>
|
|
{
|
|
public string Name { get; }
|
|
|
|
internal VariableExpression(Type varType, string name) : base(ExpressionTypeEx.Variable.ExprT(), varType)
|
|
=> Name = name;
|
|
|
|
public bool Equals(VariableExpression other)
|
|
=> Name == other.Name && Type == other.Type;
|
|
}
|
|
|
|
public class AssignExpression : Expression
|
|
{
|
|
public Expression Left { get; }
|
|
public Expression Right { get; }
|
|
|
|
internal AssignExpression(Expression left, Expression right) : base(ExpressionTypeEx.Assign.ExprT(), left.Type)
|
|
{
|
|
Left = left;
|
|
Right = right;
|
|
}
|
|
}
|
|
}
|