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/* ****************************************************************************
*
* Copyright (c) Microsoft Corporation.
*
* This source code is subject to terms and conditions of the Apache License, Version 2.0. A
* copy of the license can be found in the License.html file at the root of this distribution. If
* you cannot locate the Apache License, Version 2.0, please send an email to
* dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound
* by the terms of the Apache License, Version 2.0.
*
* You must not remove this notice, or any other, from this software.
*
*
* ***************************************************************************/
using System.Collections.ObjectModel;
using System.Dynamic.Utils;
using System.Runtime.CompilerServices;
#if !FEATURE_CORE_DLR
namespace Microsoft.Scripting.Ast.Compiler {
#else
namespace System.Linq.Expressions.Compiler {
#endif
internal partial class StackSpiller {
private abstract class BindingRewriter {
protected MemberBinding _binding;
protected RewriteAction _action;
protected StackSpiller _spiller;
internal BindingRewriter(MemberBinding binding, StackSpiller spiller) {
_binding = binding;
_spiller = spiller;
}
internal RewriteAction Action {
get { return _action; }
}
internal abstract MemberBinding AsBinding();
internal abstract Expression AsExpression(Expression target);
internal static BindingRewriter Create(MemberBinding binding, StackSpiller spiller, Stack stack) {
switch (binding.BindingType) {
case MemberBindingType.Assignment:
MemberAssignment assign = (MemberAssignment)binding;
return new MemberAssignmentRewriter(assign, spiller, stack);
case MemberBindingType.ListBinding:
MemberListBinding list = (MemberListBinding)binding;
return new ListBindingRewriter(list, spiller, stack);
case MemberBindingType.MemberBinding:
MemberMemberBinding member = (MemberMemberBinding)binding;
return new MemberMemberBindingRewriter(member, spiller, stack);
}
throw Error.UnhandledBinding();
}
}
private class MemberMemberBindingRewriter : BindingRewriter {
ReadOnlyCollection<MemberBinding> _bindings;
BindingRewriter[] _bindingRewriters;
internal MemberMemberBindingRewriter(MemberMemberBinding binding, StackSpiller spiller, Stack stack) :
base(binding, spiller) {
_bindings = binding.Bindings;
_bindingRewriters = new BindingRewriter[_bindings.Count];
for (int i = 0; i < _bindings.Count; i++) {
BindingRewriter br = BindingRewriter.Create(_bindings[i], spiller, stack);
_action |= br.Action;
_bindingRewriters[i] = br;
}
}
internal override MemberBinding AsBinding() {
switch (_action) {
case RewriteAction.None:
return _binding;
case RewriteAction.Copy:
MemberBinding[] newBindings = new MemberBinding[_bindings.Count];
for (int i = 0; i < _bindings.Count; i++) {
newBindings[i] = _bindingRewriters[i].AsBinding();
}
return Expression.MemberBind(_binding.Member, new TrueReadOnlyCollection<MemberBinding>(newBindings));
}
throw ContractUtils.Unreachable;
}
internal override Expression AsExpression(Expression target) {
if (target.Type.IsValueType && _binding.Member is System.Reflection.PropertyInfo) {
throw Error.CannotAutoInitializeValueTypeMemberThroughProperty(_binding.Member);
}
RequireNotRefInstance(target);
MemberExpression member = Expression.MakeMemberAccess(target, _binding.Member);
ParameterExpression memberTemp = _spiller.MakeTemp(member.Type);
Expression[] block = new Expression[_bindings.Count + 2];
block[0] = Expression.Assign(memberTemp, member);
for (int i = 0; i < _bindings.Count; i++) {
BindingRewriter br = _bindingRewriters[i];
block[i + 1] = br.AsExpression(memberTemp);
}
// We need to copy back value types
if (memberTemp.Type.IsValueType) {
block[_bindings.Count + 1] = Expression.Block(
typeof(void),
Expression.Assign(Expression.MakeMemberAccess(target, _binding.Member), memberTemp)
);
} else {
block[_bindings.Count + 1] = Expression.Empty();
}
return MakeBlock(block);
}
}
private class ListBindingRewriter : BindingRewriter {
ReadOnlyCollection<ElementInit> _inits;
ChildRewriter[] _childRewriters;
internal ListBindingRewriter(MemberListBinding binding, StackSpiller spiller, Stack stack) :
base(binding, spiller) {
_inits = binding.Initializers;
_childRewriters = new ChildRewriter[_inits.Count];
for (int i = 0; i < _inits.Count; i++) {
ElementInit init = _inits[i];
ChildRewriter cr = new ChildRewriter(spiller, stack, init.Arguments.Count);
cr.Add(init.Arguments);
_action |= cr.Action;
_childRewriters[i] = cr;
}
}
internal override MemberBinding AsBinding() {
switch (_action) {
case RewriteAction.None:
return _binding;
case RewriteAction.Copy:
ElementInit[] newInits = new ElementInit[_inits.Count];
for (int i = 0; i < _inits.Count; i++) {
ChildRewriter cr = _childRewriters[i];
if (cr.Action == RewriteAction.None) {
newInits[i] = _inits[i];
} else {
newInits[i] = Expression.ElementInit(_inits[i].AddMethod, cr[0, -1]);
}
}
return Expression.ListBind(_binding.Member, new TrueReadOnlyCollection<ElementInit>(newInits));
}
throw ContractUtils.Unreachable;
}
internal override Expression AsExpression(Expression target) {
if (target.Type.IsValueType && _binding.Member is System.Reflection.PropertyInfo) {
throw Error.CannotAutoInitializeValueTypeElementThroughProperty(_binding.Member);
}
RequireNotRefInstance(target);
MemberExpression member = Expression.MakeMemberAccess(target, _binding.Member);
ParameterExpression memberTemp = _spiller.MakeTemp(member.Type);
Expression[] block = new Expression[_inits.Count + 2];
block[0] = Expression.Assign(memberTemp, member);
for (int i = 0; i < _inits.Count; i++) {
ChildRewriter cr = _childRewriters[i];
Result add = cr.Finish(Expression.Call(memberTemp, _inits[i].AddMethod, cr[0, -1]));
block[i + 1] = add.Node;
}
// We need to copy back value types
if (memberTemp.Type.IsValueType) {
block[_inits.Count + 1] = Expression.Block(
typeof(void),
Expression.Assign(Expression.MakeMemberAccess(target, _binding.Member), memberTemp)
);
} else {
block[_inits.Count + 1] = Expression.Empty();
}
return MakeBlock(block);
}
}
private class MemberAssignmentRewriter : BindingRewriter {
Expression _rhs;
internal MemberAssignmentRewriter(MemberAssignment binding, StackSpiller spiller, Stack stack) :
base(binding, spiller) {
Result result = spiller.RewriteExpression(binding.Expression, stack);
_action = result.Action;
_rhs = result.Node;
}
internal override MemberBinding AsBinding() {
switch (_action) {
case RewriteAction.None:
return _binding;
case RewriteAction.Copy:
return Expression.Bind(_binding.Member, _rhs);
}
throw ContractUtils.Unreachable;
}
internal override Expression AsExpression(Expression target) {
RequireNotRefInstance(target);
MemberExpression member = Expression.MakeMemberAccess(target, _binding.Member);
ParameterExpression memberTemp = _spiller.MakeTemp(member.Type);
return MakeBlock(
Expression.Assign(memberTemp, _rhs),
Expression.Assign(member, memberTemp),
Expression.Empty()
);
}
}
}
}
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