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ILSpy/ICSharpCode.Decompiler/IL/Transforms/TransformExpressionTrees.cs

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// Copyright (c) 2017 Siegfried Pammer
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// to whom the Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using ICSharpCode.Decompiler.CSharp.Resolver;
using ICSharpCode.Decompiler.Semantics;
using ICSharpCode.Decompiler.TypeSystem;
using ICSharpCode.Decompiler.TypeSystem.Implementation;
using ICSharpCode.Decompiler.Util;
namespace ICSharpCode.Decompiler.IL.Transforms
{
/// <summary>
/// Converts LINQ Expression Trees to ILFunctions/ILAst instructions.
///
/// We build a tree of Func{ILInstruction}s, which are only executed, if the whole transform succeeds.
/// </summary>
public class TransformExpressionTrees : IStatementTransform
{
/// <summary>
/// Returns true if the instruction matches the pattern for Expression.Lambda calls.
/// </summary>
static bool MightBeExpressionTree(ILInstruction inst, ILInstruction stmt)
{
if (!(inst is CallInstruction call
&& call.Method.FullNameIs("System.Linq.Expressions.Expression", "Lambda")
&& call.Arguments.Count == 2))
return false;
if (!(IsEmptyParameterList(call.Arguments[1]) || (call.Arguments[1] is Block block && block.Kind == BlockKind.ArrayInitializer)))
return false;
//if (!ILInlining.CanUninline(call, stmt))
// return false;
return true;
}
static bool IsEmptyParameterList(ILInstruction inst)
{
if (inst is CallInstruction emptyCall && emptyCall.Method.FullNameIs("System.Array", "Empty") && emptyCall.Arguments.Count == 0)
return true;
if (inst.MatchNewArr(out var type) && type.FullName == "System.Linq.Expressions.ParameterExpression")
return true;
if (inst.MatchNewArr(out type) && type.FullName == "System.Linq.Expressions.Expression")
return true;
return false;
}
bool MatchParameterVariableAssignment(ILInstruction expr, out ILVariable parameterReferenceVar, out IType type, out string name)
{
// stloc(v, call(Expression::Parameter, call(Type::GetTypeFromHandle, ldtoken(...)), ldstr(...)))
type = null;
name = null;
if (!expr.MatchStLoc(out parameterReferenceVar, out var init))
return false;
if (!parameterReferenceVar.IsSingleDefinition)
return false;
if (!(parameterReferenceVar.Kind == VariableKind.Local || parameterReferenceVar.Kind == VariableKind.StackSlot))
return false;
if (parameterReferenceVar.Type == null || parameterReferenceVar.Type.FullName != "System.Linq.Expressions.ParameterExpression")
return false;
if (!(init is CallInstruction initCall && initCall.Arguments.Count == 2))
return false;
if (!(initCall.Method.FullNameIs("System.Linq.Expressions.Expression", "Parameter")))
return false;
CallInstruction typeArg = initCall.Arguments[0] as CallInstruction;
if (typeArg == null || typeArg.Arguments.Count != 1)
return false;
if (!typeArg.Method.FullNameIs("System.Type", "GetTypeFromHandle"))
return false;
return typeArg.Arguments[0].MatchLdTypeToken(out type) && initCall.Arguments[1].MatchLdStr(out name);
}
StatementTransformContext context;
Dictionary<ILVariable, (IType, string)> parameters;
Dictionary<ILVariable, ILVariable> parameterMapping;
List<ILInstruction> instructionsToRemove;
Stack<ILFunction> lambdaStack;
CSharpConversions conversions;
CSharpResolver resolver;
public void Run(Block block, int pos, StatementTransformContext context)
{
if (!context.Settings.ExpressionTrees)
return;
this.context = context;
this.conversions = CSharpConversions.Get(context.TypeSystem);
this.resolver = new CSharpResolver(context.TypeSystem);
this.parameters = new Dictionary<ILVariable, (IType, string)>();
this.parameterMapping = new Dictionary<ILVariable, ILVariable>();
this.instructionsToRemove = new List<ILInstruction>();
this.lambdaStack = new Stack<ILFunction>();
for (int i = pos; i < block.Instructions.Count; i++)
{
if (MatchParameterVariableAssignment(block.Instructions[i], out var v, out var type, out var name))
{
parameters.Add(v, (type, name));
continue;
}
if (TryConvertExpressionTree(block.Instructions[i], block.Instructions[i]))
{
foreach (var inst in instructionsToRemove)
block.Instructions.Remove(inst);
instructionsToRemove.Clear();
}
break;
}
}
bool TryConvertExpressionTree(ILInstruction instruction, ILInstruction statement)
{
if (MightBeExpressionTree(instruction, statement))
{
var (lambda, type) = ConvertLambda((CallInstruction)instruction);
if (lambda != null)
{
context.Step("Convert Expression Tree", instruction);
var newLambda = (ILFunction)lambda();
SetExpressionTreeFlag(newLambda, (CallInstruction)instruction);
instruction.ReplaceWith(newLambda);
return true;
}
return false;
}
if (instruction is Block block && block.Kind == BlockKind.ControlFlow)
return false; // don't look into nested blocks
foreach (var child in instruction.Children)
{
if (TryConvertExpressionTree(child, statement))
return true;
}
return false;
}
/// <summary>
/// Converts a Expression.Lambda call into an ILFunction.
/// If the conversion fails, null is returned.
/// </summary>
(Func<ILInstruction>, IType) ConvertLambda(CallInstruction instruction)
{
if (instruction.Method.Name != "Lambda" || instruction.Arguments.Count != 2 || instruction.Method.ReturnType.FullName != "System.Linq.Expressions.Expression" || instruction.Method.ReturnType.TypeArguments.Count != 1)
return (null, SpecialType.UnknownType);
var parameterList = new List<IParameter>();
var parameterVariablesList = new List<ILVariable>();
if (!ReadParameters(instruction.Arguments[1], parameterList, parameterVariablesList, new SimpleTypeResolveContext(context.Function.Method)))
return (null, SpecialType.UnknownType);
var container = new BlockContainer();
container.AddILRange(instruction);
var functionType = instruction.Method.ReturnType.TypeArguments[0];
var returnType = functionType.GetDelegateInvokeMethod()?.ReturnType ?? SpecialType.UnknownType;
var function = new ILFunction(returnType, parameterList, context.Function.GenericContext, container, ILFunctionKind.ExpressionTree);
function.DelegateType = functionType;
function.Kind = IsExpressionTree(functionType) ? ILFunctionKind.ExpressionTree : ILFunctionKind.Delegate;
function.Variables.AddRange(parameterVariablesList);
function.AddILRange(instruction);
lambdaStack.Push(function);
var (bodyInstruction, type) = ConvertInstruction(instruction.Arguments[0]);
lambdaStack.Pop();
if (bodyInstruction == null)
return (null, SpecialType.UnknownType);
return (BuildFunction, function.DelegateType);
ILFunction BuildFunction()
{
lambdaStack.Push(function);
var convertedBody = bodyInstruction();
lambdaStack.Pop();
container.ExpectedResultType = convertedBody.ResultType;
container.Blocks.Add(new Block() { Instructions = { new Leave(container, convertedBody) } });
// Replace all other usages of the parameter variable
foreach (var mapping in parameterMapping)
{
foreach (var load in mapping.Key.LoadInstructions.ToArray())
{
if (load.IsDescendantOf(instruction))
continue;
load.ReplaceWith(new LdLoc(mapping.Value));
}
}
return function;
}
}
(Func<ILInstruction>, IType) ConvertQuote(CallInstruction invocation)
{
if (invocation.Arguments.Count != 1)
return (null, SpecialType.UnknownType);
var argument = invocation.Arguments.Single();
if (argument is ILFunction function)
{
return (() => function, function.DelegateType);
}
else
{
var (converted, type) = ConvertInstruction(argument);
if (converted == null)
return (converted, type);
return (BuildQuote, type);
ILInstruction BuildQuote()
{
var f = converted();
if (f is ILFunction lambda && argument is CallInstruction call)
{
SetExpressionTreeFlag(lambda, call);
}
return f;
}
}
}
void SetExpressionTreeFlag(ILFunction lambda, CallInstruction call)
{
lambda.Kind = IsExpressionTree(call.Method.ReturnType) ? ILFunctionKind.ExpressionTree : ILFunctionKind.Delegate;
lambda.DelegateType = call.Method.ReturnType;
}
bool ReadParameters(ILInstruction initializer, IList<IParameter> parameters, IList<ILVariable> parameterVariables, ITypeResolveContext resolveContext)
{
switch (initializer)
{
case Block initializerBlock:
if (initializerBlock.Kind != BlockKind.ArrayInitializer)
return false;
int i = 0;
foreach (var inst in initializerBlock.Instructions.OfType<StObj>())
{
if (i >= this.parameters.Count)
return false;
if (!inst.Value.MatchLdLoc(out var v))
return false;
if (!this.parameters.TryGetValue(v, out var value))
return false;
// Add parameter variable only once to mapping.
if (!this.parameterMapping.ContainsKey(v))
{
var param = new ILVariable(VariableKind.Parameter, value.Item1, i) { Name = value.Item2 };
parameterMapping.Add(v, param);
parameterVariables.Add(param);
parameters.Add(new DefaultParameter(value.Item1, value.Item2));
instructionsToRemove.Add((ILInstruction)v.StoreInstructions[0]);
}
i++;
}
return true;
default:
return IsEmptyParameterList(initializer);
}
}
(Func<ILInstruction>, IType) ConvertInstruction(ILInstruction instruction, IType typeHint = null)
{
var (inst, type) = Convert();
if (inst == null)
return (null, type);
ILInstruction DoConvert()
{
var result = inst();
Debug.Assert(type != null, "IType must be non-null!");
Debug.Assert(result.ResultType == type.GetStackType(), "StackTypes must match!");
if (typeHint != null)
{
if (result.ResultType != typeHint.GetStackType())
{
return new Conv(result, typeHint.GetStackType().ToPrimitiveType(), false, typeHint.GetSign());
}
}
return result;
}
return (DoConvert, typeHint ?? type);
(Func<ILInstruction>, IType) Convert()
{
switch (instruction)
{
case CallInstruction invocation:
if (invocation.Method.DeclaringType.FullName != "System.Linq.Expressions.Expression")
return (null, SpecialType.UnknownType);
switch (invocation.Method.Name)
{
case "Add":
return ConvertBinaryNumericOperator(invocation, BinaryNumericOperator.Add, false);
case "AddChecked":
return ConvertBinaryNumericOperator(invocation, BinaryNumericOperator.Add, true);
case "And":
return ConvertBinaryNumericOperator(invocation, BinaryNumericOperator.BitAnd);
case "AndAlso":
return ConvertLogicOperator(invocation, true);
case "ArrayAccess":
case "ArrayIndex":
return ConvertArrayIndex(invocation);
case "ArrayLength":
return ConvertArrayLength(invocation);
case "Call":
return ConvertCall(invocation);
case "Coalesce":
return ConvertCoalesce(invocation);
case "Condition":
return ConvertCondition(invocation);
case "Constant":
return ConvertConstant(invocation);
case "Convert":
return ConvertCast(invocation, false);
case "ConvertChecked":
return ConvertCast(invocation, true);
case "Divide":
return ConvertBinaryNumericOperator(invocation, BinaryNumericOperator.Div);
case "Equal":
return ConvertComparison(invocation, ComparisonKind.Equality);
case "ExclusiveOr":
return ConvertBinaryNumericOperator(invocation, BinaryNumericOperator.BitXor);
case "Field":
return ConvertField(invocation, typeHint);
case "GreaterThan":
return ConvertComparison(invocation, ComparisonKind.GreaterThan);
case "GreaterThanOrEqual":
return ConvertComparison(invocation, ComparisonKind.GreaterThanOrEqual);
case "Invoke":
return ConvertInvoke(invocation);
case "Lambda":
return ConvertLambda(invocation);
case "LeftShift":
return ConvertBinaryNumericOperator(invocation, BinaryNumericOperator.ShiftLeft);
case "LessThan":
return ConvertComparison(invocation, ComparisonKind.LessThan);
case "LessThanOrEqual":
return ConvertComparison(invocation, ComparisonKind.LessThanOrEqual);
case "ListInit":
return ConvertListInit(invocation);
case "MemberInit":
return ConvertMemberInit(invocation);
case "Modulo":
return ConvertBinaryNumericOperator(invocation, BinaryNumericOperator.Rem);
case "Multiply":
return ConvertBinaryNumericOperator(invocation, BinaryNumericOperator.Mul, false);
case "MultiplyChecked":
return ConvertBinaryNumericOperator(invocation, BinaryNumericOperator.Mul, true);
case "Negate":
return ConvertUnaryNumericOperator(invocation, BinaryNumericOperator.Sub, false);
case "NegateChecked":
return ConvertUnaryNumericOperator(invocation, BinaryNumericOperator.Sub, true);
case "New":
return ConvertNewObject(invocation);
case "NewArrayBounds":
return ConvertNewArrayBounds(invocation);
case "NewArrayInit":
return ConvertNewArrayInit(invocation);
case "Not":
return ConvertNotOperator(invocation);
case "NotEqual":
return ConvertComparison(invocation, ComparisonKind.Inequality);
case "OnesComplement":
return ConvertNotOperator(invocation);
case "Or":
return ConvertBinaryNumericOperator(invocation, BinaryNumericOperator.BitOr);
case "OrElse":
return ConvertLogicOperator(invocation, false);
case "Property":
return ConvertProperty(invocation);
case "Quote":
return ConvertQuote(invocation);
case "RightShift":
return ConvertBinaryNumericOperator(invocation, BinaryNumericOperator.ShiftRight);
case "Subtract":
return ConvertBinaryNumericOperator(invocation, BinaryNumericOperator.Sub, false);
case "SubtractChecked":
return ConvertBinaryNumericOperator(invocation, BinaryNumericOperator.Sub, true);
case "TypeAs":
return ConvertTypeAs(invocation);
case "TypeIs":
return ConvertTypeIs(invocation);
}
return (null, SpecialType.UnknownType);
case ILFunction function:
ILFunction ApplyChangesToILFunction()
{
if (function.Kind == ILFunctionKind.ExpressionTree)
{
function.DelegateType = UnwrapExpressionTree(function.DelegateType);
function.Kind = ILFunctionKind.Delegate;
}
return function;
}
return (ApplyChangesToILFunction, function.DelegateType);
case LdLoc ldloc:
if (IsExpressionTreeParameter(ldloc.Variable))
{
// Replace an already mapped parameter with the actual ILVariable,
// we generated earlier.
if (parameterMapping.TryGetValue(ldloc.Variable, out var v))
{
if (typeHint.SkipModifiers() is ByReferenceType && !v.Type.IsByRefLike)
return (() => new LdLoca(v), typeHint);
return (() => new LdLoc(v), v.Type);
}
// This is a parameter variable from an outer scope.
// We can't replace these variables just yet, because the transform works backwards.
// We simply return the same instruction again, but return the actual expected type,
// so our transform can continue normally.
// Later, we will replace all references to unmapped variables,
// with references to mapped parameters.
if (ldloc.Variable.IsSingleDefinition && ldloc.Variable.StoreInstructions[0] is ILInstruction instr)
{
if (MatchParameterVariableAssignment(instr, out _, out var t, out _))
return (() => new ExpressionTreeCast(t, ldloc, false), t);
}
}
return (null, SpecialType.UnknownType);
default:
return (null, SpecialType.UnknownType);
}
}
}
bool IsExpressionTree(IType delegateType) => delegateType is ParameterizedType pt
&& pt.FullName == "System.Linq.Expressions.Expression"
&& pt.TypeArguments.Count == 1;
IType UnwrapExpressionTree(IType delegateType)
{
if (delegateType is ParameterizedType pt && pt.FullName == "System.Linq.Expressions.Expression" && pt.TypeArguments.Count == 1)
{
return pt.TypeArguments[0];
}
return delegateType;
}
(Func<ILInstruction>, IType) ConvertArrayIndex(CallInstruction invocation)
{
if (invocation.Arguments.Count != 2)
return (null, SpecialType.UnknownType);
var (array, arrayType) = ConvertInstruction(invocation.Arguments[0]);
if (array == null)
return (null, SpecialType.UnknownType);
if (!(arrayType is ArrayType type))
return (null, SpecialType.UnknownType);
if (!MatchArgumentList(invocation.Arguments[1], out var arguments))
arguments = new[] { invocation.Arguments[1] };
ILInstruction Convert()
{
Func<ILInstruction>[] toBeConverted = new Func<ILInstruction>[arguments.Count];
for (int i = 0; i < arguments.Count; i++)
{
var (converted, indexType) = ConvertInstruction(arguments[i]);
if (converted == null)
return null;
toBeConverted[i] = converted;
}
return new LdObj(new LdElema(type.ElementType, array(), toBeConverted.SelectArray(f => f())) { DelayExceptions = true }, type.ElementType);
}
return (Convert, type.ElementType);
}
(Func<ILInstruction>, IType) ConvertArrayLength(CallInstruction invocation)
{
if (invocation.Arguments.Count != 1)
return (null, SpecialType.UnknownType);
var (converted, _) = ConvertInstruction(invocation.Arguments[0]);
if (converted == null)
return (null, SpecialType.UnknownType);
return (() => new LdLen(StackType.I4, converted()), context.TypeSystem.FindType(KnownTypeCode.Int32));
}
(Func<ILInstruction>, IType) ConvertBinaryNumericOperator(CallInstruction invocation, BinaryNumericOperator op, bool? isChecked = null)
{
if (invocation.Arguments.Count < 2)
return (null, SpecialType.UnknownType);
var (left, leftType) = ConvertInstruction(invocation.Arguments[0]);
if (left == null)
return (null, SpecialType.UnknownType);
var (right, rightType) = ConvertInstruction(invocation.Arguments[1]);
if (right == null)
return (null, SpecialType.UnknownType);
IMember method;
switch (invocation.Arguments.Count)
{
case 2:
if (op == BinaryNumericOperator.ShiftLeft || op == BinaryNumericOperator.ShiftRight)
{
if (!NullableType.GetUnderlyingType(rightType).IsKnownType(KnownTypeCode.Int32))
return (null, SpecialType.UnknownType);
}
else
{
if (!rightType.Equals(leftType))
return (null, SpecialType.UnknownType);
}
return (() => new BinaryNumericInstruction(op, left(), right(),
NullableType.GetUnderlyingType(leftType).GetStackType(),
NullableType.GetUnderlyingType(rightType).GetStackType(),
isChecked == true,
leftType.GetSign(),
isLifted: NullableType.IsNullable(leftType) || NullableType.IsNullable(rightType)), leftType);
case 3:
if (!MatchGetMethodFromHandle(invocation.Arguments[2], out method))
return (null, SpecialType.UnknownType);
return (() => new Call((IMethod)method) {
Arguments = { left(), right() }
}, method.ReturnType);
case 4:
if (!invocation.Arguments[2].MatchLdcI4(out var isLiftedToNull))
return (null, SpecialType.UnknownType);
if (!MatchGetMethodFromHandle(invocation.Arguments[3], out method))
return (null, SpecialType.UnknownType);
bool isLifted = NullableType.IsNullable(leftType);
if (isLifted)
method = CSharpOperators.LiftUserDefinedOperator((IMethod)method);
return (() => new Call((IMethod)method) {
Arguments = { left(), right() }
}, isLiftedToNull != 0 ? NullableType.Create(method.Compilation, method.ReturnType) : method.ReturnType);
default:
return (null, SpecialType.UnknownType);
}
}
(Func<ILVariable, ILInstruction>, IType) ConvertBind(CallInstruction invocation)
{
if (invocation.Arguments.Count != 2)
return (null, SpecialType.UnknownType);
var (value, typeValue) = ConvertInstruction(invocation.Arguments[1]);
if (value == null)
return (null, SpecialType.UnknownType);
if (MatchGetMethodFromHandle(invocation.Arguments[0], out var member))
{
}
else if (MatchGetFieldFromHandle(invocation.Arguments[0], out member))
{
}
else
{
return (null, SpecialType.UnknownType);
}
switch (member)
{
case IMethod method:
if (method.IsStatic)
return (targetVariable => new Call(method) { Arguments = { new LdLoc(targetVariable), value() } }, method.ReturnType);
else
return (targetVariable => new CallVirt(method) { Arguments = { new LdLoc(targetVariable), value() } }, method.ReturnType);
case IField field:
return (targetVariable => new StObj(new LdFlda(new LdLoc(targetVariable), (IField)member) { DelayExceptions = true }, value(), member.ReturnType), field.ReturnType);
}
return (null, SpecialType.UnknownType);
}
(Func<ILInstruction>, IType) ConvertCall(CallInstruction invocation)
{
if (invocation.Arguments.Count < 2)
return (null, SpecialType.UnknownType);
IList<ILInstruction> arguments = null;
Func<ILInstruction> targetConverter = null;
IType targetType = null;
if (MatchGetMethodFromHandle(invocation.Arguments[0], out var member))
{
// static method
if (invocation.Arguments.Count != 2 || !MatchArgumentList(invocation.Arguments[1], out arguments))
{
arguments = new List<ILInstruction>(invocation.Arguments.Skip(1));
}
}
else if (MatchGetMethodFromHandle(invocation.Arguments[1], out member))
{
if (invocation.Arguments.Count != 3 || !MatchArgumentList(invocation.Arguments[2], out arguments))
{
arguments = new List<ILInstruction>(invocation.Arguments.Skip(2));
}
if (!invocation.Arguments[0].MatchLdNull())
{
(targetConverter, targetType) = ConvertInstruction(invocation.Arguments[0]);
if (targetConverter == null)
return (null, SpecialType.UnknownType);
}
}
if (arguments == null)
return (null, SpecialType.UnknownType);
IMethod method = (IMethod)member;
var convertedArguments = ConvertCallArguments(arguments, method);
if (convertedArguments == null)
return (null, SpecialType.UnknownType);
if (method.FullName == "System.Reflection.MethodInfo.CreateDelegate" && method.Parameters.Count == 2)
{
if (!MatchGetMethodFromHandle(UnpackConstant(invocation.Arguments[0]), out var targetMethod))
return (null, SpecialType.UnknownType);
if (!MatchGetTypeFromHandle(UnpackConstant(arguments[0]), out var delegateType))
return (null, SpecialType.UnknownType);
return (() => new NewObj(delegateType.GetConstructors().Single()) {
Arguments = { convertedArguments[1](), new LdFtn((IMethod)targetMethod) }
}, delegateType);
}
CallInstruction BuildCall()
{
CallInstruction call;
if (method.IsStatic)
{
call = new Call(method);
}
else
{
call = new CallVirt(method);
}
if (targetConverter != null)
{
call.Arguments.Add(PrepareCallTarget(method.DeclaringType, targetConverter(), targetType));
}
call.Arguments.AddRange(convertedArguments.Select(f => f()));
return call;
}
return (BuildCall, method.ReturnType);
}
ILInstruction PrepareCallTarget(IType expectedType, ILInstruction target, IType targetType)
{
switch (CallInstruction.ExpectedTypeForThisPointer(expectedType))
{
case StackType.Ref:
if (target.ResultType == StackType.Ref)
{
return target;
}
else if (target is LdLoc ldloc)
{
return new LdLoca(ldloc.Variable).WithILRange(ldloc);
}
else
{
return new AddressOf(target, expectedType);
}
case StackType.O:
if (targetType.IsReferenceType == false)
{
return new Box(target, targetType);
}
else
{
return target;
}
default:
if (expectedType.Kind == TypeKind.Unknown && target.ResultType != StackType.Unknown)
{
return new Conv(target, PrimitiveType.Unknown, false, Sign.None);
}
return target;
}
}
ILInstruction UnpackConstant(ILInstruction inst)
{
if (!(inst is CallInstruction call && call.Method.FullName == "System.Linq.Expressions.Expression.Constant" && call.Arguments.Count == 2))
return inst;
return call.Arguments[0];
}
Func<ILInstruction>[] ConvertCallArguments(IList<ILInstruction> arguments, IMethod method)
{
var converted = new Func<ILInstruction>[arguments.Count];
Debug.Assert(arguments.Count == method.Parameters.Count);
for (int i = 0; i < arguments.Count; i++)
{
var expectedType = method.Parameters[i].Type;
var argument = ConvertInstruction(arguments[i], expectedType).Item1;
if (argument == null)
return null;
converted[i] = argument;
}
return converted;
}
(Func<ILInstruction>, IType) ConvertCast(CallInstruction invocation, bool isChecked)
{
if (invocation.Arguments.Count < 2)
return (null, SpecialType.UnknownType);
if (!MatchGetTypeFromHandle(invocation.Arguments[1], out var targetType))
return (null, SpecialType.UnknownType);
var (expr, exprType) = ConvertInstruction(invocation.Arguments[0]);
if (expr == null)
return (null, SpecialType.UnknownType);
if (exprType.IsSmallIntegerType() && targetType.IsKnownType(KnownTypeCode.Int32))
return (expr, targetType);
return (() => new ExpressionTreeCast(targetType, expr(), isChecked), targetType);
}
(Func<ILInstruction>, IType) ConvertCoalesce(CallInstruction invocation)
{
if (invocation.Arguments.Count != 2)
return (null, SpecialType.UnknownType);
var (trueInst, trueInstType) = ConvertInstruction(invocation.Arguments[0]);
if (trueInst == null)
return (null, SpecialType.UnknownType);
var (fallbackInst, fallbackInstType) = ConvertInstruction(invocation.Arguments[1]);
if (fallbackInst == null)
return (null, SpecialType.UnknownType);
var kind = NullCoalescingKind.Ref;
var trueInstTypeNonNullable = NullableType.GetUnderlyingType(trueInstType);
IType targetType;
if (NullableType.IsNullable(trueInstType) && conversions.ImplicitConversion(fallbackInstType, trueInstTypeNonNullable).IsValid)
{
targetType = trueInstTypeNonNullable;
kind = NullableType.IsNullable(fallbackInstType) ? NullCoalescingKind.Nullable : NullCoalescingKind.NullableWithValueFallback;
}
else if (conversions.ImplicitConversion(fallbackInstType, trueInstType).IsValid)
{
targetType = trueInstType;
}
else
{
targetType = fallbackInstType;
}
return (() => new NullCoalescingInstruction(kind, trueInst(), fallbackInst()) {
UnderlyingResultType = trueInstTypeNonNullable.GetStackType()
}, targetType);
}
(Func<ILInstruction>, IType) ConvertComparison(CallInstruction invocation, ComparisonKind kind)
{
if (invocation.Arguments.Count < 2)
return (null, SpecialType.UnknownType);
var (left, leftType) = ConvertInstruction(invocation.Arguments[0]);
if (left == null)
return (null, SpecialType.UnknownType);
var (right, rightType) = ConvertInstruction(invocation.Arguments[1]);
if (right == null)
return (null, SpecialType.UnknownType);
if (invocation.Arguments.Count == 4 && invocation.Arguments[2].MatchLdcI4(out var isLiftedToNull) && MatchGetMethodFromHandle(invocation.Arguments[3], out var method))
{
bool isLifted = NullableType.IsNullable(leftType);
if (isLifted)
method = CSharpOperators.LiftUserDefinedOperator((IMethod)method);
return (() => new Call((IMethod)method) { Arguments = { left(), right() } }, isLiftedToNull != 0 ? NullableType.Create(method.Compilation, method.ReturnType) : method.ReturnType);
}
var rr = resolver.ResolveBinaryOperator(kind.ToBinaryOperatorType(), new ResolveResult(leftType), new ResolveResult(rightType)) as OperatorResolveResult;
if (rr != null && !rr.IsError && rr.UserDefinedOperatorMethod != null)
{
return (() => new Call(rr.UserDefinedOperatorMethod) { Arguments = { left(), right() } }, rr.UserDefinedOperatorMethod.ReturnType);
}
if (leftType.IsKnownType(KnownTypeCode.String) && rightType.IsKnownType(KnownTypeCode.String))
{
IMethod operatorMethod;
switch (kind)
{
case ComparisonKind.Equality:
operatorMethod = leftType.GetMethods(m => m.IsOperator && m.Name == "op_Equality" && m.Parameters.Count == 2).FirstOrDefault(m => m.Parameters[0].Type.IsKnownType(KnownTypeCode.String) && m.Parameters[1].Type.IsKnownType(KnownTypeCode.String));
if (operatorMethod == null)
return (null, SpecialType.UnknownType);
break;
case ComparisonKind.Inequality:
operatorMethod = leftType.GetMethods(m => m.IsOperator && m.Name == "op_Inequality" && m.Parameters.Count == 2).FirstOrDefault(m => m.Parameters[0].Type.IsKnownType(KnownTypeCode.String) && m.Parameters[1].Type.IsKnownType(KnownTypeCode.String));
if (operatorMethod == null)
return (null, SpecialType.UnknownType);
break;
default:
return (null, SpecialType.UnknownType);
}
return (() => new Call(operatorMethod) { Arguments = { left(), right() } }, operatorMethod.ReturnType);
}
var resultType = context.TypeSystem.FindType(KnownTypeCode.Boolean);
var lifting = NullableType.IsNullable(leftType) ? ComparisonLiftingKind.CSharp : ComparisonLiftingKind.None;
var utype = NullableType.GetUnderlyingType(leftType);
return (() => new Comp(kind, lifting, utype.GetStackType(), utype.GetSign(), left(), right()), resultType);
}
(Func<ILInstruction>, IType) ConvertCondition(CallInstruction invocation)
{
if (invocation.Arguments.Count != 3)
return (null, SpecialType.UnknownType);
var (condition, conditionType) = ConvertInstruction(invocation.Arguments[0]);
if (condition == null || !conditionType.IsKnownType(KnownTypeCode.Boolean))
return (null, SpecialType.UnknownType);
var (trueInst, trueInstType) = ConvertInstruction(invocation.Arguments[1]);
if (trueInst == null)
return (null, SpecialType.UnknownType);
var (falseInst, falseInstType) = ConvertInstruction(invocation.Arguments[2]);
if (falseInst == null)
return (null, SpecialType.UnknownType);
if (!NormalizeTypeVisitor.TypeErasure.EquivalentTypes(trueInstType, falseInstType))
return (null, SpecialType.UnknownType);
return (() => new IfInstruction(condition(), trueInst(), falseInst()), trueInstType);
}
(Func<ILInstruction>, IType) ConvertConstant(CallInstruction invocation)
{
if (!MatchConstantCall(invocation, out var value, out var type))
return (null, SpecialType.UnknownType);
if (value.MatchBox(out var arg, out var boxType))
{
if (boxType.Kind == TypeKind.Enum || boxType.IsKnownType(KnownTypeCode.Boolean))
return (() => new ExpressionTreeCast(boxType, ConvertValue(arg, invocation), false), boxType);
return (() => ConvertValue(arg, invocation), type);
}
return (() => ConvertValue(value, invocation), type);
}
(Func<ILInstruction>, IType) ConvertElementInit(CallInstruction invocation)
{
if (invocation.Arguments.Count != 2)
return (null, SpecialType.UnknownType);
if (!MatchGetMethodFromHandle(invocation.Arguments[0], out var member))
return (null, SpecialType.UnknownType);
if (!MatchArgumentList(invocation.Arguments[1], out var arguments))
return (null, SpecialType.UnknownType);
var args = new Func<ILInstruction>[arguments.Count];
for (int i = 0; i < arguments.Count; i++)
{
var arg = ConvertInstruction(arguments[i]).Item1;
if (arg == null)
return (null, SpecialType.UnknownType);
args[i] = arg;
}
ILInstruction BuildCall()
{
CallInstruction call = member.IsStatic
? (CallInstruction)new Call((IMethod)member)
: new CallVirt((IMethod)member);
call.Arguments.AddRange(args.Select(f => f()));
return call;
}
return (BuildCall, member.ReturnType);
}
(Func<ILInstruction>, IType) ConvertField(CallInstruction invocation, IType typeHint)
{
if (invocation.Arguments.Count != 2)
return (null, SpecialType.UnknownType);
Func<ILInstruction> targetConverter = null;
if (!invocation.Arguments[0].MatchLdNull())
{
targetConverter = ConvertInstruction(invocation.Arguments[0]).Item1;
if (targetConverter == null)
return (null, SpecialType.UnknownType);
}
if (!MatchGetFieldFromHandle(invocation.Arguments[1], out var member))
return (null, SpecialType.UnknownType);
IType type = member.ReturnType;
if (typeHint.SkipModifiers() is ByReferenceType && !member.ReturnType.IsByRefLike)
{
type = typeHint;
}
return (BuildField, type);
ILInstruction BuildField()
{
ILInstruction inst;
if (targetConverter == null)
{
inst = new LdsFlda((IField)member);
}
else
{
var target = targetConverter();
if (member.DeclaringType.IsReferenceType == true)
{
inst = new LdFlda(target, (IField)member) { DelayExceptions = true };
}
else
{
inst = new LdFlda(new AddressOf(target, member.DeclaringType), (IField)member) { DelayExceptions = true };
}
}
if (!(typeHint.SkipModifiers() is ByReferenceType && !member.ReturnType.IsByRefLike))
{
inst = new LdObj(inst, member.ReturnType);
}
return inst;
}
}
(Func<ILInstruction>, IType) ConvertInvoke(CallInstruction invocation)
{
if (invocation.Arguments.Count != 2)
return (null, SpecialType.UnknownType);
var (targetConverter, targetType) = ConvertInstruction(invocation.Arguments[0]);
if (targetConverter == null)
return (null, SpecialType.UnknownType);
var invokeMethod = targetType.GetDelegateInvokeMethod();
if (invokeMethod == null)
return (null, SpecialType.UnknownType);
if (!MatchArgumentList(invocation.Arguments[1], out var arguments))
return (null, SpecialType.UnknownType);
var convertedArguments = ConvertCallArguments(arguments, invokeMethod);
if (convertedArguments == null)
return (null, SpecialType.UnknownType);
ILInstruction BuildCall()
{
var call = new CallVirt(invokeMethod);
call.Arguments.Add(targetConverter());
call.Arguments.AddRange(convertedArguments.Select(f => f()));
return call;
}
return (BuildCall, invokeMethod.ReturnType);
}
(Func<ILInstruction>, IType) ConvertListInit(CallInstruction invocation)
{
if (invocation.Arguments.Count < 2)
return (null, SpecialType.UnknownType);
var newObj = ConvertInstruction(invocation.Arguments[0]).Item1;
if (newObj == null)
return (null, SpecialType.UnknownType);
if (!MatchNew((CallInstruction)invocation.Arguments[0], out var ctor))
return (null, SpecialType.UnknownType);
IList<ILInstruction> arguments;
if (!MatchGetMethodFromHandle(invocation.Arguments[1], out var member))
{
if (!MatchArgumentList(invocation.Arguments[1], out arguments))
return (null, SpecialType.UnknownType);
}
else
{
if (invocation.Arguments.Count != 3 || !MatchArgumentList(invocation.Arguments[2], out arguments))
return (null, SpecialType.UnknownType);
}
if (arguments == null || arguments.Count == 0)
return (null, SpecialType.UnknownType);
Func<ILVariable, ILInstruction>[] convertedArguments = new Func<ILVariable, ILInstruction>[arguments.Count];
for (int i = 0; i < arguments.Count; i++)
{
if (arguments[i] is CallInstruction elementInit && elementInit.Method.FullName == "System.Linq.Expressions.Expression.ElementInit")
{
var arg = ConvertElementInit(elementInit).Item1;
if (arg == null)
return (null, SpecialType.UnknownType);
convertedArguments[i] = v => { var a = arg(); ((CallInstruction)a).Arguments.Insert(0, new LdLoc(v)); return a; };
}
else
{
var arg = ConvertInstruction(arguments[i]).Item1;
if (arg == null)
return (null, SpecialType.UnknownType);
convertedArguments[i] = v => arg();
}
}
Block BuildBlock()
{
var initializerBlock = new Block(BlockKind.CollectionInitializer);
ILFunction function = lambdaStack.Peek();
var initializer = function.RegisterVariable(VariableKind.InitializerTarget, ctor.DeclaringType);
initializerBlock.FinalInstruction = new LdLoc(initializer);
initializerBlock.Instructions.Add(new StLoc(initializer, newObj()));
initializerBlock.Instructions.AddRange(convertedArguments.Select(f => f(initializer)));
return initializerBlock;
}
return (BuildBlock, ctor.DeclaringType);
}
(Func<ILInstruction>, IType) ConvertLogicOperator(CallInstruction invocation, bool and)
{
if (invocation.Arguments.Count < 2)
return (null, SpecialType.UnknownType);
var (left, leftType) = ConvertInstruction(invocation.Arguments[0]);
if (left == null)
return (null, SpecialType.UnknownType);
var (right, rightType) = ConvertInstruction(invocation.Arguments[1]);
if (right == null)
return (null, SpecialType.UnknownType);
IMember method;
switch (invocation.Arguments.Count)
{
case 2:
var resultType = context.TypeSystem.FindType(KnownTypeCode.Boolean);
return (() => and ? IfInstruction.LogicAnd(left(), right()) : IfInstruction.LogicOr(left(), right()), resultType);
case 3:
if (!MatchGetMethodFromHandle(invocation.Arguments[2], out method))
return (null, SpecialType.UnknownType);
return (() => new Call((IMethod)method) {
Arguments = { left(), right() }
}, method.ReturnType);
case 4:
if (!invocation.Arguments[2].MatchLdcI4(out var isLiftedToNull))
return (null, SpecialType.UnknownType);
if (!MatchGetMethodFromHandle(invocation.Arguments[3], out method))
return (null, SpecialType.UnknownType);
bool isLifted = NullableType.IsNullable(leftType);
if (isLifted)
method = CSharpOperators.LiftUserDefinedOperator((IMethod)method);
return (() => new Call((IMethod)method) {
Arguments = { left(), right() }
}, isLiftedToNull != 0 ? NullableType.Create(method.Compilation, method.ReturnType) : method.ReturnType);
default:
return (null, SpecialType.UnknownType);
}
}
(Func<ILInstruction>, IType) ConvertMemberInit(CallInstruction invocation)
{
if (invocation.Arguments.Count != 2)
return (null, SpecialType.UnknownType);
var newObj = ConvertInstruction(invocation.Arguments[0]).Item1;
if (newObj == null)
return (null, SpecialType.UnknownType);
if (!MatchNew((CallInstruction)invocation.Arguments[0], out var ctor))
return (null, SpecialType.UnknownType);
if (!MatchArgumentList(invocation.Arguments[1], out var arguments))
return (null, SpecialType.UnknownType);
if (arguments == null || arguments.Count == 0)
return (null, SpecialType.UnknownType);
Func<ILVariable, ILInstruction>[] convertedArguments = new Func<ILVariable, ILInstruction>[arguments.Count];
for (int i = 0; i < arguments.Count; i++)
{
Func<ILVariable, ILInstruction> arg;
if (arguments[i] is CallInstruction bind && bind.Method.FullName == "System.Linq.Expressions.Expression.Bind")
{
arg = ConvertBind(bind).Item1;
if (arg == null)
return (null, SpecialType.UnknownType);
}
else
{
return (null, SpecialType.UnknownType);
}
convertedArguments[i] = arg;
}
ILInstruction BuildBlock()
{
var function = lambdaStack.Peek();
var initializer = function.RegisterVariable(VariableKind.InitializerTarget, ctor.DeclaringType);
var initializerBlock = new Block(BlockKind.CollectionInitializer);
initializerBlock.FinalInstruction = new LdLoc(initializer);
initializerBlock.Instructions.Add(new StLoc(initializer, newObj()));
initializerBlock.Instructions.AddRange(convertedArguments.Select(f => f(initializer)));
return initializerBlock;
}
return (BuildBlock, ctor.DeclaringType);
}
(Func<ILInstruction>, IType) ConvertNewArrayBounds(CallInstruction invocation)
{
if (invocation.Arguments.Count != 2)
return (null, SpecialType.UnknownType);
if (!MatchGetTypeFromHandle(invocation.Arguments[0], out var type))
return (null, SpecialType.UnknownType);
if (!MatchArgumentList(invocation.Arguments[1], out var arguments))
return (null, SpecialType.UnknownType);
if (arguments.Count == 0)
return (null, SpecialType.UnknownType);
var indices = new Func<ILInstruction>[arguments.Count];
for (int i = 0; i < arguments.Count; i++)
{
var index = ConvertInstruction(arguments[i]).Item1;
if (index == null)
return (null, SpecialType.UnknownType);
indices[i] = index;
}
return (() => new NewArr(type, indices.SelectArray(f => f())), new ArrayType(context.TypeSystem, type, arguments.Count));
}
(Func<ILInstruction>, IType) ConvertNewArrayInit(CallInstruction invocation)
{
if (invocation.Arguments.Count != 2)
return (null, SpecialType.UnknownType);
if (!MatchGetTypeFromHandle(invocation.Arguments[0], out var type))
return (null, SpecialType.UnknownType);
if (!MatchArgumentList(invocation.Arguments[1], out var arguments))
return (null, SpecialType.UnknownType);
ArrayType arrayType = new ArrayType(context.BlockContext.TypeSystem, type);
if (arguments.Count == 0)
return (() => new NewArr(type, new LdcI4(0)), arrayType);
var convertedArguments = new Func<ILInstruction>[arguments.Count];
for (int i = 0; i < arguments.Count; i++)
{
ILInstruction item = arguments[i];
var value = ConvertInstruction(item).Item1;
if (value == null)
return (null, SpecialType.UnknownType);
convertedArguments[i] = value;
}
ILInstruction BuildInitializer()
{
var block = (Block)invocation.Arguments[1];
var function = lambdaStack.Peek();
var variable = function.RegisterVariable(VariableKind.InitializerTarget, arrayType);
Block initializer = new Block(BlockKind.ArrayInitializer);
initializer.Instructions.Add(new StLoc(variable, new NewArr(type, new LdcI4(convertedArguments.Length))));
for (int i = 0; i < convertedArguments.Length; i++)
{
initializer.Instructions.Add(new StObj(new LdElema(type, new LdLoc(variable), new LdcI4(i)) { DelayExceptions = true }, convertedArguments[i](), type));
}
initializer.FinalInstruction = new LdLoc(variable);
return initializer;
}
return (BuildInitializer, arrayType);
}
bool MatchNew(CallInstruction invocation, out IMethod ctor)
{
ctor = null;
if (invocation.Method.Name != "New")
return false;
switch (invocation.Arguments.Count)
{
case 1:
if (MatchGetTypeFromHandle(invocation.Arguments[0], out var type))
{
ctor = type.GetConstructors(c => c.Parameters.Count == 0).FirstOrDefault();
return ctor != null;
}
if (MatchGetConstructorFromHandle(invocation.Arguments[0], out var member))
{
ctor = (IMethod)member;
return true;
}
return false;
case 2:
case 3:
if (!MatchGetConstructorFromHandle(invocation.Arguments[0], out member))
return false;
ctor = (IMethod)member;
return true;
default:
return false;
}
}
(Func<ILInstruction>, IType) ConvertNewObject(CallInstruction invocation)
{
switch (invocation.Arguments.Count)
{
case 1:
if (MatchGetTypeFromHandle(invocation.Arguments[0], out var type))
{
var ctor = type.GetConstructors(c => c.Parameters.Count == 0).FirstOrDefault();
if (ctor == null)
return (null, SpecialType.UnknownType);
return (() => new NewObj(ctor), type);
}
if (MatchGetConstructorFromHandle(invocation.Arguments[0], out var member))
{
return (() => new NewObj((IMethod)member), member.DeclaringType);
}
return (null, SpecialType.UnknownType);
case 2:
if (!MatchGetConstructorFromHandle(invocation.Arguments[0], out member))
return (null, SpecialType.UnknownType);
if (!MatchArgumentList(invocation.Arguments[1], out var arguments))
return (null, SpecialType.UnknownType);
IMethod method = (IMethod)member;
Func<ILInstruction>[] convertedArguments = ConvertCallArguments(arguments, method);
if (convertedArguments == null)
return (null, SpecialType.UnknownType);
return (() => BuildNewObj(method, convertedArguments), member.DeclaringType);
case 3:
if (!MatchGetConstructorFromHandle(invocation.Arguments[0], out member))
return (null, SpecialType.UnknownType);
if (!MatchArgumentList(invocation.Arguments[1], out arguments))
return (null, SpecialType.UnknownType);
method = (IMethod)member;
convertedArguments = ConvertCallArguments(arguments, method);
if (convertedArguments == null)
return (null, SpecialType.UnknownType);
return (() => BuildNewObj(method, convertedArguments), member.DeclaringType);
}
ILInstruction BuildNewObj(IMethod method, Func<ILInstruction>[] args)
{
var newObj = new NewObj(method);
newObj.Arguments.AddRange(args.Select(f => f()));
return newObj;
}
return (null, SpecialType.UnknownType);
}
(Func<ILInstruction>, IType) ConvertNotOperator(CallInstruction invocation)
{
if (invocation.Arguments.Count < 1)
return (null, SpecialType.UnknownType);
var (argument, argumentType) = ConvertInstruction(invocation.Arguments[0]);
if (argument == null)
return (null, SpecialType.UnknownType);
var underlyingType = NullableType.GetUnderlyingType(argumentType);
switch (invocation.Arguments.Count)
{
case 1:
bool isLifted = NullableType.IsNullable(argumentType);
return (() => underlyingType.IsKnownType(KnownTypeCode.Boolean)
? Comp.LogicNot(argument(), isLifted)
: (ILInstruction)new BitNot(argument(), isLifted, underlyingType.GetStackType()), argumentType);
case 2:
if (!MatchGetMethodFromHandle(invocation.Arguments[1], out var method))
return (null, SpecialType.UnknownType);
return (() => new Call((IMethod)method) {
Arguments = { argument() }
}, method.ReturnType);
default:
return (null, SpecialType.UnknownType);
}
}
(Func<ILInstruction>, IType) ConvertProperty(CallInstruction invocation)
{
if (invocation.Arguments.Count < 2)
return (null, SpecialType.UnknownType);
Func<ILInstruction> targetConverter = null;
IType targetType = null;
if (!invocation.Arguments[0].MatchLdNull())
{
(targetConverter, targetType) = ConvertInstruction(invocation.Arguments[0]);
if (targetConverter == null)
return (null, SpecialType.UnknownType);
}
if (!MatchGetMethodFromHandle(invocation.Arguments[1], out var member))
return (null, SpecialType.UnknownType);
IList<ILInstruction> arguments;
if (invocation.Arguments.Count != 3 || !MatchArgumentList(invocation.Arguments[2], out arguments))
{
arguments = new List<ILInstruction>();
}
var convertedArguments = ConvertCallArguments(arguments, (IMethod)member);
if (convertedArguments == null)
return (null, SpecialType.UnknownType);
ILInstruction BuildProperty()
{
CallInstruction call;
if (member.IsStatic)
{
call = new Call((IMethod)member);
}
else
{
call = new CallVirt((IMethod)member);
}
if (targetConverter != null)
{
call.Arguments.Add(PrepareCallTarget(member.DeclaringType, targetConverter(), targetType));
}
call.Arguments.AddRange(convertedArguments.Select(f => f()));
return call;
}
return (BuildProperty, member.ReturnType);
}
(Func<ILInstruction>, IType) ConvertTypeAs(CallInstruction invocation)
{
if (invocation.Arguments.Count != 2)
return (null, SpecialType.UnknownType);
var converted = ConvertInstruction(invocation.Arguments[0]).Item1;
if (!MatchGetTypeFromHandle(invocation.Arguments[1], out var type))
return (null, SpecialType.UnknownType);
if (converted == null)
return (null, SpecialType.UnknownType);
ILInstruction BuildTypeAs()
{
ILInstruction inst = new IsInst(converted(), type);
// We must follow ECMA-335, III.4.6:
// If typeTok is a nullable type, Nullable<T>, it is interpreted as "boxed" T.
if (type.IsKnownType(KnownTypeCode.NullableOfT))
inst = new UnboxAny(inst, type);
return inst;
}
return (BuildTypeAs, type);
}
(Func<ILInstruction>, IType) ConvertTypeIs(CallInstruction invocation)
{
if (invocation.Arguments.Count != 2)
return (null, SpecialType.UnknownType);
var converted = ConvertInstruction(invocation.Arguments[0]).Item1;
if (!MatchGetTypeFromHandle(invocation.Arguments[1], out var type))
return (null, SpecialType.UnknownType);
var resultType = context.TypeSystem.FindType(KnownTypeCode.Boolean);
if (converted != null)
return (() => new Comp(ComparisonKind.Inequality, Sign.None, new IsInst(converted(), type), new LdNull()), resultType);
return (null, SpecialType.UnknownType);
}
(Func<ILInstruction>, IType) ConvertUnaryNumericOperator(CallInstruction invocation, BinaryNumericOperator op, bool? isChecked = null)
{
if (invocation.Arguments.Count < 1)
return (null, SpecialType.UnknownType);
var (argument, argumentType) = ConvertInstruction(invocation.Arguments[0]);
if (argument == null)
return (null, SpecialType.UnknownType);
switch (invocation.Arguments.Count)
{
case 1:
ILInstruction left;
var underlyingType = NullableType.GetUnderlyingType(argumentType);
switch (underlyingType.GetStackType())
{
case StackType.I4:
left = new LdcI4(0);
break;
case StackType.I8:
left = new LdcI8(0);
break;
case StackType.I:
left = new Conv(new LdcI4(0), PrimitiveType.I, false, Sign.None);
break;
case StackType.F4:
left = new LdcF4(0);
break;
case StackType.F8:
left = new LdcF8(0);
break;
case StackType.O when underlyingType.IsKnownType(KnownTypeCode.Decimal):
left = new LdcDecimal(0);
break;
default:
return (null, SpecialType.UnknownType);
}
return (() => new BinaryNumericInstruction(op, left, argument(),
underlyingType.GetStackType(),
underlyingType.GetStackType(),
isChecked == true,
argumentType.GetSign(),
isLifted: NullableType.IsNullable(argumentType)), argumentType);
case 2:
if (!MatchGetMethodFromHandle(invocation.Arguments[1], out var method))
return (null, SpecialType.UnknownType);
return (() => new Call((IMethod)method) {
Arguments = { argument() }
}, method.ReturnType);
}
return (null, SpecialType.UnknownType);
}
ILInstruction ConvertValue(ILInstruction value, ILInstruction context)
{
switch (value)
{
case LdLoc ldloc:
if (IsExpressionTreeParameter(ldloc.Variable))
{
if (!parameterMapping.TryGetValue(ldloc.Variable, out var v))
return ldloc.Clone();
if (context is CallInstruction parentCall
&& parentCall.Method.FullName == "System.Linq.Expressions.Expression.Call"
&& v.StackType.IsIntegerType())
return new LdLoca(v).WithILRange(ldloc);
return null;
}
else if (IsClosureReference(ldloc.Variable))
{
if (ldloc.Variable.Kind == VariableKind.Local)
{
ldloc.Variable.Kind = VariableKind.DisplayClassLocal;
}
if (ldloc.Variable.CaptureScope == null)
{
ldloc.Variable.CaptureScope = BlockContainer.FindClosestContainer(context);
var f = ldloc.Variable.CaptureScope.Ancestors.OfType<ILFunction>().FirstOrDefault();
if (f != null)
{
f.CapturedVariables.Add(ldloc.Variable);
}
}
return ldloc;
}
else
{
return ldloc;
}
default:
return value.Clone();
}
}
bool IsClosureReference(ILVariable variable)
{
if (!variable.IsSingleDefinition || !(variable.StoreInstructions.SingleOrDefault() is StLoc store))
return false;
if (!(store.Value is NewObj newObj))
return false;
return TransformDisplayClassUsage.IsPotentialClosure(this.context, newObj);
}
bool IsExpressionTreeParameter(ILVariable variable)
{
return variable.Type.FullName == "System.Linq.Expressions.ParameterExpression";
}
bool MatchConstantCall(ILInstruction inst, out ILInstruction value, out IType type)
{
value = null;
type = null;
if (inst is CallInstruction call && call.Method.FullName == "System.Linq.Expressions.Expression.Constant")
{
value = call.Arguments[0];
if (call.Arguments.Count == 2)
return MatchGetTypeFromHandle(call.Arguments[1], out type);
type = value.InferType(context.TypeSystem);
return true;
}
return false;
}
internal static bool MatchGetTypeFromHandle(ILInstruction inst, out IType type)
{
type = null;
return inst is CallInstruction getTypeCall
&& getTypeCall.Method.FullName == "System.Type.GetTypeFromHandle"
&& getTypeCall.Arguments.Count == 1
&& getTypeCall.Arguments[0].MatchLdTypeToken(out type);
}
bool MatchGetMethodFromHandle(ILInstruction inst, out IMember member)
{
member = null;
//castclass System.Reflection.MethodInfo(call GetMethodFromHandle(ldmembertoken op_Addition))
if (!inst.MatchCastClass(out var arg, out var type))
return false;
if (type.FullName != "System.Reflection.MethodInfo")
return false;
if (!(arg is CallInstruction call && call.Method.FullName == "System.Reflection.MethodBase.GetMethodFromHandle"))
return false;
return MatchFromHandleParameterList(call, out member);
}
bool MatchGetConstructorFromHandle(ILInstruction inst, out IMember member)
{
member = null;
//castclass System.Reflection.ConstructorInfo(call GetMethodFromHandle(ldmembertoken op_Addition))
if (!inst.MatchCastClass(out var arg, out var type))
return false;
if (type.FullName != "System.Reflection.ConstructorInfo")
return false;
if (!(arg is CallInstruction call && call.Method.FullName == "System.Reflection.MethodBase.GetMethodFromHandle"))
return false;
return MatchFromHandleParameterList(call, out member);
}
bool MatchGetFieldFromHandle(ILInstruction inst, out IMember member)
{
member = null;
if (!(inst is CallInstruction call && call.Method.FullName == "System.Reflection.FieldInfo.GetFieldFromHandle"))
return false;
return MatchFromHandleParameterList(call, out member);
}
static bool MatchFromHandleParameterList(CallInstruction call, out IMember member)
{
member = null;
switch (call.Arguments.Count)
{
case 1:
if (!call.Arguments[0].MatchLdMemberToken(out member))
return false;
break;
case 2:
if (!call.Arguments[0].MatchLdMemberToken(out member))
return false;
if (!call.Arguments[1].MatchLdTypeToken(out _))
return false;
break;
default:
return false;
}
return true;
}
bool MatchArgumentList(ILInstruction inst, out IList<ILInstruction> arguments)
{
arguments = null;
if (!(inst is Block block && block.Kind == BlockKind.ArrayInitializer))
{
if (IsEmptyParameterList(inst))
{
arguments = new List<ILInstruction>();
return true;
}
return false;
}
int i = 0;
arguments = new List<ILInstruction>();
foreach (var item in block.Instructions.OfType<StObj>())
{
if (!(item.Target is LdElema ldelem && ldelem.Indices.Single().MatchLdcI4(i)))
return false;
arguments.Add(item.Value);
i++;
}
return true;
}
}
}