/
TransformExpressionTrees.cs
1137 lines (1091 loc) · 45.8 KB
/
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.CSharp.Syntax;
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.
/// </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.FullName == "System.Linq.Expressions.Expression.Lambda"
&& call.Arguments.Count == 2))
return false;
if (call.Parent is CallInstruction parentCall && parentCall.Method.FullName == "System.Linq.Expressions.Expression.Quote")
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.FullName == "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;
IMethod parameterMethod = initCall.Method;
if (!(parameterMethod.Name == "Parameter" && parameterMethod.DeclaringType.FullName == "System.Linq.Expressions.Expression"))
return false;
CallInstruction typeArg = initCall.Arguments[0] as CallInstruction;
if (typeArg == null || typeArg.Arguments.Count != 1)
return false;
if (typeArg.Method.FullName != "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.Compilation);
this.resolver = new CSharpResolver(context.TypeSystem.Compilation);
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);
instruction.ReplaceWith(lambda);
return true;
}
return false;
}
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>
(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);
bool isQuotedLambda = instruction.Parent is CallInstruction call && call.Method.FullName == "System.Linq.Expressions.Expression.Quote";
var container = new BlockContainer();
var functionType = instruction.Method.ReturnType.TypeArguments[0];
var function = new ILFunction(functionType.GetDelegateInvokeMethod()?.ReturnType, parameterList, container);
if (isQuotedLambda || lambdaStack.Count == 0)
function.DelegateType = instruction.Method.ReturnType;
else
function.DelegateType = functionType;
function.Variables.AddRange(parameterVariablesList);
lambdaStack.Push(function);
var (bodyInstruction, type) = ConvertInstruction(instruction.Arguments[0]);
lambdaStack.Pop();
if (bodyInstruction == null)
return (null, SpecialType.UnknownType);
container.ExpectedResultType = bodyInstruction.ResultType;
container.Blocks.Add(new Block() { Instructions = { new Leave(container, bodyInstruction) } });
return (function, function.DelegateType);
}
bool ReadParameters(ILInstruction initializer, IList<IParameter> parameters, IList<ILVariable> parameterVariables, ITypeResolveContext resolveContext)
{
if (!context.Function.Method.IsStatic) {
var thisParam = context.Function.Variables[0];
parameterVariables.Add(new ILVariable(VariableKind.Parameter, thisParam.Type, -1) { Name = "this" });
}
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;
var param = new ILVariable(VariableKind.Parameter, value.Item1, i) { Name = value.Item2 };
parameterMapping.Add(v, param);
parameterVariables.Add(param);
parameters.Add(new DefaultUnresolvedParameter(value.Item1.ToTypeReference(), value.Item2).CreateResolvedParameter(resolveContext));
instructionsToRemove.Add((ILInstruction)v.StoreInstructions[0]);
i++;
}
return true;
default:
return IsEmptyParameterList(initializer);
}
}
(ILInstruction, IType) ConvertInstruction(ILInstruction instruction)
{
var result = Convert();
if (result.Item1 != null) {
Debug.Assert(result.Item2 != null, "IType must be non-null!");
Debug.Assert(result.Item1.ResultType == result.Item2.GetStackType(), "StackTypes must match!");
}
return result;
(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);
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":
if (invocation.Arguments.Count == 1)
return ConvertInstruction(invocation.Arguments.Single());
else
return (null, SpecialType.UnknownType);
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:
if (function.IsExpressionTree) {
function.DelegateType = UnwrapExpressionTree(function.DelegateType);
}
return (function, function.DelegateType);
case LdLoc ldloc:
if (IsExpressionTreeParameter(ldloc.Variable)) {
if (!parameterMapping.TryGetValue(ldloc.Variable, out var v))
return (null, SpecialType.UnknownType);
return (new LdLoc(v), v.Type);
}
return (null, SpecialType.UnknownType);
default:
return (null, SpecialType.UnknownType);
}
}
}
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;
}
(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] };
for (int i = 0; i < arguments.Count; i++) {
var (converted, indexType) = ConvertInstruction(arguments[i]);
if (converted == null)
return (null, SpecialType.UnknownType);
arguments[i] = converted;
}
return (new LdObj(new LdElema(type.ElementType, array, arguments.ToArray()), type.ElementType), type.ElementType);
}
(ILInstruction, IType) ConvertArrayLength(CallInstruction invocation)
{
if (invocation.Arguments.Count != 1)
return (null, SpecialType.UnknownType);
var (converted, arrayType) = ConvertInstruction(invocation.Arguments[0]);
if (converted == null)
return (null, SpecialType.UnknownType);
return (new LdLen(StackType.I4, converted), context.TypeSystem.Compilation.FindType(KnownTypeCode.Int32));
}
(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 (!rightType.IsKnownType(KnownTypeCode.Int32))
return (null, SpecialType.UnknownType);
} else {
if (!rightType.Equals(leftType))
return (null, SpecialType.UnknownType);
}
return (new BinaryNumericInstruction(op, left, right, isChecked == true, leftType.GetSign()), 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 isLifted))
return (null, SpecialType.UnknownType);
if (!MatchGetMethodFromHandle(invocation.Arguments[3], out method))
return (null, SpecialType.UnknownType);
if (isLifted != 0)
method = CSharpOperators.LiftUserDefinedOperator((IMethod)method);
return (new Call((IMethod)method) {
Arguments = { left, right }
}, method.ReturnType);
default:
return (null, SpecialType.UnknownType);
}
}
(ILInstruction, IType) ConvertBind(CallInstruction invocation, ILVariable targetVariable)
{
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:
return (new Call(method) { Arguments = { new LdLoc(targetVariable), value } }, method.ReturnType);
case IField field:
return (new StObj(new LdFlda(new LdLoc(targetVariable), (IField)member), value, member.ReturnType), field.ReturnType);
}
return (null, SpecialType.UnknownType);
}
(ILInstruction, IType) ConvertCall(CallInstruction invocation)
{
if (invocation.Arguments.Count < 2)
return (null, SpecialType.UnknownType);
IList<ILInstruction> arguments = null;
ILInstruction target = 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()) {
(target, targetType) = ConvertInstruction(invocation.Arguments[0]);
if (target == null)
return (null, SpecialType.UnknownType);
}
}
if (arguments == null)
return (null, SpecialType.UnknownType);
// TODO : do we need the types here?
arguments = arguments.Select(i => ConvertInstruction(i).Item1).ToArray();
if (arguments.Any(p => p == null))
return (null, SpecialType.UnknownType);
IMethod method = (IMethod)member;
if (method.FullName == "System.Reflection.MethodInfo.CreateDelegate" && method.Parameters.Count == 2) {
if (!MatchGetMethodFromHandle(target, out var targetMethod))
return (null, SpecialType.UnknownType);
if (!MatchGetTypeFromHandle(arguments[0], out var delegateType))
return (null, SpecialType.UnknownType);
return (new NewObj(delegateType.GetConstructors().Single()) {
Arguments = { arguments[1], new LdFtn((IMethod)targetMethod) }
}, delegateType);
}
CallInstruction call;
if (method.IsAbstract || method.IsVirtual || method.IsOverride) {
call = new CallVirt(method);
} else {
call = new Call(method);
}
if (target != null) {
call.Arguments.Add(PrepareCallTarget(method.DeclaringType, target, targetType));
}
call.Arguments.AddRange(arguments);
return (call, 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
return new AddressOf(target);
case StackType.O:
if (targetType.IsReferenceType == false) {
return new Box(target, targetType);
} else {
return target;
}
default:
return target;
}
}
(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);
}
(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), targetType);
}
(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 isLifted) && MatchGetMethodFromHandle(invocation.Arguments[3], out var method)) {
if (isLifted != 0) {
method = CSharpOperators.LiftUserDefinedOperator((IMethod)method);
}
return (new Call((IMethod)method) { Arguments = { left, right } }, 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.Compilation.FindType(KnownTypeCode.Boolean);
return (new Comp(kind, NullableType.IsNullable(leftType) ? ComparisonLiftingKind.CSharp : ComparisonLiftingKind.None, leftType.GetStackType(), leftType.GetSign(), left, right), resultType);
}
(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 (!trueInstType.Equals(falseInstType))
return (null, SpecialType.UnknownType);
return (new IfInstruction(condition, trueInst, falseInst), trueInstType);
}
(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);
value = ConvertValue(arg, invocation);
return (value, type);
}
return (ConvertValue(value, invocation), type);
}
(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);
CallInstruction call = new Call((IMethod)member);
for (int i = 0; i < arguments.Count; i++) {
ILInstruction arg = ConvertInstruction(arguments[i]).Item1;
if (arg == null)
return (null, SpecialType.UnknownType);
arguments[i] = arg;
}
call.Arguments.AddRange(arguments);
return (call, member.ReturnType);
}
(ILInstruction, IType) ConvertField(CallInstruction invocation)
{
if (invocation.Arguments.Count != 2)
return (null, SpecialType.UnknownType);
ILInstruction target = null;
if (!invocation.Arguments[0].MatchLdNull()) {
target = ConvertInstruction(invocation.Arguments[0]).Item1;
if (target == null)
return (null, SpecialType.UnknownType);
}
if (!MatchGetFieldFromHandle(invocation.Arguments[1], out var member))
return (null, SpecialType.UnknownType);
if (target == null) {
return (new LdObj(new LdsFlda((IField)member), member.ReturnType), member.ReturnType);
} else {
return (new LdObj(new LdFlda(target, (IField)member), member.ReturnType), member.ReturnType);
}
}
(ILInstruction, IType) ConvertInvoke(CallInstruction invocation)
{
if (invocation.Arguments.Count != 2)
return (null, SpecialType.UnknownType);
var (target, targetType) = ConvertInstruction(invocation.Arguments[0]);
if (target == 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);
for (int i = 0; i < arguments.Count; i++) {
var arg = ConvertInstruction(arguments[i]).Item1;
if (arg == null)
return (null, SpecialType.UnknownType);
arguments[i] = arg;
}
var call = new CallVirt(invokeMethod);
call.Arguments.Add(target);
call.Arguments.AddRange(arguments);
return (call, invokeMethod.ReturnType);
}
(ILInstruction, IType) ConvertListInit(CallInstruction invocation)
{
if (invocation.Arguments.Count < 2)
return (null, SpecialType.UnknownType);
var newObj = ConvertInstruction(invocation.Arguments[0]).Item1 as NewObj;
if (newObj == null)
return (null, SpecialType.UnknownType);
IList<ILInstruction> arguments = null;
ILFunction function = lambdaStack.Peek();
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);
var initializer = function.RegisterVariable(VariableKind.InitializerTarget, newObj.Method.DeclaringType);
for (int i = 0; i < arguments.Count; i++) {
ILInstruction arg;
if (arguments[i] is CallInstruction elementInit && elementInit.Method.FullName == "System.Linq.Expressions.Expression.ElementInit") {
arg = ConvertElementInit(elementInit).Item1;
if (arg == null)
return (null, SpecialType.UnknownType);
((CallInstruction)arg).Arguments.Insert(0, new LdLoc(initializer));
} else {
arg = ConvertInstruction(arguments[i]).Item1;
if (arg == null)
return (null, SpecialType.UnknownType);
}
arguments[i] = arg;
}
var initializerBlock = new Block(BlockKind.CollectionInitializer);
initializerBlock.FinalInstruction = new LdLoc(initializer);
initializerBlock.Instructions.Add(new StLoc(initializer, newObj));
initializerBlock.Instructions.AddRange(arguments);
return (initializerBlock, initializer.Type);
}
(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.Compilation.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 isLifted))
return (null, SpecialType.UnknownType);
if (!MatchGetMethodFromHandle(invocation.Arguments[3], out method))
return (null, SpecialType.UnknownType);
if (isLifted != 0)
method = CSharpOperators.LiftUserDefinedOperator((IMethod)method);
return (new Call((IMethod)method) {
Arguments = { left, right }
}, method.ReturnType);
default:
return (null, SpecialType.UnknownType);
}
}
(ILInstruction, IType) ConvertMemberInit(CallInstruction invocation)
{
if (invocation.Arguments.Count != 2)
return (null, SpecialType.UnknownType);
var newObj = ConvertInstruction(invocation.Arguments[0]).Item1 as NewObj;
if (newObj == null)
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);
var function = lambdaStack.Peek();
var initializer = function.RegisterVariable(VariableKind.InitializerTarget, newObj.Method.DeclaringType);
for (int i = 0; i < arguments.Count; i++) {
ILInstruction arg;
if (arguments[i] is CallInstruction bind && bind.Method.FullName == "System.Linq.Expressions.Expression.Bind") {
arg = ConvertBind(bind, initializer).Item1;
if (arg == null)
return (null, SpecialType.UnknownType);
} else {
return (null, SpecialType.UnknownType);
}
arguments[i] = arg;
}
var initializerBlock = new Block(BlockKind.CollectionInitializer);
initializerBlock.FinalInstruction = new LdLoc(initializer);
initializerBlock.Instructions.Add(new StLoc(initializer, newObj));
initializerBlock.Instructions.AddRange(arguments);
return (initializerBlock, initializer.Type);
}
(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 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), new ArrayType(context.TypeSystem.Compilation, type, arguments.Count));
}
(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);
if (arguments.Count == 0)
return (null, SpecialType.UnknownType);
var block = (Block)invocation.Arguments[1];
var function = lambdaStack.Peek();
var variable = function.RegisterVariable(VariableKind.InitializerTarget, new ArrayType(context.BlockContext.TypeSystem.Compilation, type));
Block initializer = new Block(BlockKind.ArrayInitializer);
int i = 0;
initializer.Instructions.Add(new StLoc(variable, new NewArr(type, new LdcI4(arguments.Count))));
foreach (var item in arguments) {
var value = ConvertInstruction(item).Item1;
if (value == null)
return (null, SpecialType.UnknownType);
initializer.Instructions.Add(new StObj(new LdElema(type, new LdLoc(variable), new LdcI4(i)), value, type));
}
initializer.FinalInstruction = new LdLoc(variable);
return (initializer, variable.Type);
}
(ILInstruction, IType) ConvertNewObject(CallInstruction invocation)
{
IMember member;
IList<ILInstruction> arguments;
NewObj newObj;
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 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 arguments))
return (null, SpecialType.UnknownType);
var args = arguments.SelectArray(arg => ConvertInstruction(arg).Item1);
if (args.Any(a => a == null))
return (null, SpecialType.UnknownType);
newObj = new NewObj((IMethod)member);
newObj.Arguments.AddRange(args);
return (newObj, 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);
var args2 = arguments.SelectArray(arg => ConvertInstruction(arg).Item1);
if (args2.Any(a => a == null))
return (null, SpecialType.UnknownType);
newObj = new NewObj((IMethod)member);
newObj.Arguments.AddRange(args2);
return (newObj, member.DeclaringType);
}
return (null, SpecialType.UnknownType);
}
(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);
switch (invocation.Arguments.Count) {
case 1:
return (argumentType.IsKnownType(KnownTypeCode.Boolean) ? Comp.LogicNot(argument) : (ILInstruction)new BitNot(argument), 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);
}
}
(ILInstruction, IType) ConvertProperty(CallInstruction invocation)
{
if (invocation.Arguments.Count < 2)
return (null, SpecialType.UnknownType);
ILInstruction target = null;
IType targetType = null;
if (!invocation.Arguments[0].MatchLdNull()) {
(target, targetType) = ConvertInstruction(invocation.Arguments[0]);
if (target == 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>();
} else {
for (int i = 0; i < arguments.Count; i++) {
arguments[i] = ConvertInstruction(arguments[i]).Item1;
if (arguments[i] == null)
return (null, SpecialType.UnknownType);
}
}
CallInstruction call;
if (member.IsAbstract || member.IsVirtual || member.IsOverride) {
call = new CallVirt((IMethod)member);
} else {
call = new Call((IMethod)member);
}
if (target != null) {
call.Arguments.Add(PrepareCallTarget(member.DeclaringType, target, targetType));
}
call.Arguments.AddRange(arguments);
return (call, member.ReturnType);
}
(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 (new IsInst(converted, type), type);
return (null, SpecialType.UnknownType);
}
(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.Compilation.FindType(KnownTypeCode.Boolean);
if (converted != null)
return (new Comp(ComparisonKind.Inequality, Sign.None, new IsInst(converted, type), new LdNull()), resultType);
return (null, SpecialType.UnknownType);
}
(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;
switch (argument.ResultType) {
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;
default:
return (null, SpecialType.UnknownType);
}
return (new BinaryNumericInstruction(op, left, argument, isChecked == true, argumentType.GetSign()), 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)) {