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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;
using System.Reflection;
using System.Reflection.Emit;
using System.Runtime.CompilerServices;
#if !FEATURE_CORE_DLR
namespace Microsoft.Scripting.Ast.Compiler {
#else
namespace System.Linq.Expressions.Compiler {
#endif
internal sealed partial class CompilerScope {
private abstract class Storage {
internal readonly LambdaCompiler Compiler;
internal readonly ParameterExpression Variable;
internal Storage(LambdaCompiler compiler, ParameterExpression variable) {
Compiler = compiler;
Variable = variable;
}
internal abstract void EmitLoad();
internal abstract void EmitAddress();
internal abstract void EmitStore();
internal virtual void EmitStore(Storage value) {
value.EmitLoad();
EmitStore();
}
internal virtual void FreeLocal() {
}
}
private sealed class LocalStorage : Storage {
private readonly LocalBuilder _local;
internal LocalStorage(LambdaCompiler compiler, ParameterExpression variable)
: base(compiler, variable) {
// ByRef variables are supported. This is used internally by
// the compiler when emitting an inlined lambda invoke, to
// handle ByRef parameters. BlockExpression prevents this
// from being exposed to user created trees.
_local = compiler.GetNamedLocal(variable.IsByRef ? variable.Type.MakeByRefType() : variable.Type, variable);
}
internal override void EmitLoad() {
Compiler.IL.Emit(OpCodes.Ldloc, _local);
}
internal override void EmitStore() {
Compiler.IL.Emit(OpCodes.Stloc, _local);
}
internal override void EmitAddress() {
Compiler.IL.Emit(OpCodes.Ldloca, _local);
}
}
private sealed class ArgumentStorage : Storage {
private readonly int _argument;
internal ArgumentStorage(LambdaCompiler compiler, ParameterExpression p)
: base(compiler, p) {
_argument = compiler.GetLambdaArgument(compiler.Parameters.IndexOf(p));
}
internal override void EmitLoad() {
Compiler.IL.EmitLoadArg(_argument);
}
internal override void EmitStore() {
Compiler.IL.EmitStoreArg(_argument);
}
internal override void EmitAddress() {
Compiler.IL.EmitLoadArgAddress(_argument);
}
}
private sealed class ElementBoxStorage : Storage {
private readonly int _index;
private readonly Storage _array;
private readonly Type _boxType;
private readonly FieldInfo _boxValueField;
internal ElementBoxStorage(Storage array, int index, ParameterExpression variable)
: base(array.Compiler, variable) {
_array = array;
_index = index;
_boxType = typeof(StrongBox<>).MakeGenericType(variable.Type);
_boxValueField = _boxType.GetField("Value");
}
internal override void EmitLoad() {
EmitLoadBox();
Compiler.IL.Emit(OpCodes.Ldfld, _boxValueField);
}
internal override void EmitStore() {
LocalBuilder value = Compiler.GetLocal(Variable.Type);
Compiler.IL.Emit(OpCodes.Stloc, value);
EmitLoadBox();
Compiler.IL.Emit(OpCodes.Ldloc, value);
Compiler.FreeLocal(value);
Compiler.IL.Emit(OpCodes.Stfld, _boxValueField);
}
internal override void EmitStore(Storage value) {
EmitLoadBox();
value.EmitLoad();
Compiler.IL.Emit(OpCodes.Stfld, _boxValueField);
}
internal override void EmitAddress() {
EmitLoadBox();
Compiler.IL.Emit(OpCodes.Ldflda, _boxValueField);
}
internal void EmitLoadBox() {
_array.EmitLoad();
Compiler.IL.EmitInt(_index);
Compiler.IL.Emit(OpCodes.Ldelem_Ref);
Compiler.IL.Emit(OpCodes.Castclass, _boxType);
}
}
private sealed class LocalBoxStorage : Storage {
private readonly LocalBuilder _boxLocal;
private readonly Type _boxType;
private readonly FieldInfo _boxValueField;
internal LocalBoxStorage(LambdaCompiler compiler, ParameterExpression variable)
: base(compiler, variable) {
_boxType = typeof(StrongBox<>).MakeGenericType(variable.Type);
_boxValueField = _boxType.GetField("Value");
_boxLocal = compiler.GetNamedLocal(_boxType, variable);
}
internal override void EmitLoad() {
Compiler.IL.Emit(OpCodes.Ldloc, _boxLocal);
Compiler.IL.Emit(OpCodes.Ldfld, _boxValueField);
}
internal override void EmitAddress() {
Compiler.IL.Emit(OpCodes.Ldloc, _boxLocal);
Compiler.IL.Emit(OpCodes.Ldflda, _boxValueField);
}
internal override void EmitStore() {
LocalBuilder value = Compiler.GetLocal(Variable.Type);
Compiler.IL.Emit(OpCodes.Stloc, value);
Compiler.IL.Emit(OpCodes.Ldloc, _boxLocal);
Compiler.IL.Emit(OpCodes.Ldloc, value);
Compiler.FreeLocal(value);
Compiler.IL.Emit(OpCodes.Stfld, _boxValueField);
}
internal override void EmitStore(Storage value) {
Compiler.IL.Emit(OpCodes.Ldloc, _boxLocal);
value.EmitLoad();
Compiler.IL.Emit(OpCodes.Stfld, _boxValueField);
}
internal void EmitStoreBox() {
Compiler.IL.Emit(OpCodes.Stloc, _boxLocal);
}
}
}
}
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