void EmitEpilogue(IILEmitter emitter, InjectedFeature feature, NetfuserEvent.CilBodyBuilding me,
IReadOnlyList <Tuple <Instruction, Var> > returns)
{
var target = me.Target;
var rt = returns.RandomElementOrDefault(Rng);
if (rt == null)
{
if (target.HasReturnType && (feature.Output.Flags & VarFlags.Ret) == 0)
{
Utils.RandomConst(emitter, target.ReturnType, Rng);
}
emitter.Emit(OpCodes.Ret);
}
else
{
if (target.HasReturnType)
{
if ((feature.Output.Flags & VarFlags.Ret) == 0)
{
Utils.RandomConst(emitter, target.ReturnType, Rng);
}
rt.Item2.Store(emitter);
}
emitter.Emit(OpCodes.Br, rt.Item1);
}
}
public void EmitChecker(IRng rng, IILEmitter emitter, Instruction falseTarget)
{
Local local = null;
try
{
var zti = IsZeroTolerant() ? rng.NextInt32(0, 2) : -1;
if (zti >= 0 || (_upper.HasValue && _lower.HasValue))
{
local = emitter.RequestTempLocal(ElementType.ToType());
emitter.Stloc(local);
}
var upperFirst = rng.NextBoolean();
if (zti == 0)
{
EmitNz();
}
Emit(emitter, ref local, upperFirst, rng.NextBoolean(), falseTarget);
if (zti == 1)
{
EmitNz();
}
Emit(emitter, ref local, !upperFirst, rng.NextBoolean(), falseTarget);
if (zti == 2)
{
EmitNz();
}
}
finally
{
if (local != null)
{
emitter.TempLocals.Release(local);
}
}
void EmitNz()
{
emitter.Ldloc(local);
if (rng.NextBoolean())
{
emitter.Emit(OpCodes.Brfalse, falseTarget);
}
else
{
emitter.Emit(OpCodes.Ldc_I4_0);
emitter.NumericConversion(ElementType.I4, ElementType, false);
emitter.Emit(OpCodes.Beq, falseTarget);
}
}
}
public static IILEmitter Emit(this IILEmitter emitter, params OpCode[] codes)
{
foreach (var code in codes)
{
emitter.Emit(Instruction.Create(code));
}
return(emitter);
}
public static IILEmitter Emit(this IILEmitter emitter, IEnumerable <Instruction> instructions)
{
foreach (var i in instructions)
{
emitter.Emit(i.Clone());
}
return(emitter);
}
public void EmitChecker(IILEmitter emitter, IRng rng, Instruction normalFlowTarget)
{
var fv = Flag.Field;
emitter.Emit(OpCodes.Ldarg_0);
emitter.Emit(OpCodes.Ldfld, emitter.Importer.Import(fv));
if (Constraints != null)
{
emitter.NumericConversion(fv.FieldType.ElementType, Constraints.ElementType, false);
Constraints.EmitChecker(rng, emitter, normalFlowTarget);
}
else
{
var(signed, bytes) = IntConstraints.GetProps(Flag.Field.FieldType.ElementType);
emitter.Const(Value.Value, bytes, signed);
emitter.Emit(OpCodes.Bne_Un, normalFlowTarget);
}
}
public override void Store(IILEmitter emitter, Action pushValue = null)
{
if (pushValue == null)
{
using (emitter.UseTempLocal(Type, out var local))
{
emitter.Stloc(local);
emitter.Emit(OpCodes.Ldarg_0);
emitter.Ldloc(local);
}
}
else
{
emitter.Emit(OpCodes.Ldarg_0);
pushValue.Invoke();
}
Stfld(emitter);
}
public override void Store(IILEmitter emitter, Action pushValue = null)
{
pushValue?.Invoke();
if (Parameter.IsReturnTypeParameter)
{
emitter.Emit(OpCodes.Ret);
}
else
{
emitter.Starg(Parameter);
}
}
public static void EmitLoadArg(IILEmitter il, int index)
{
switch (index)
{
case 0:
il.Emit(OpCodes.Ldarg_0);
return;
case 1:
il.Emit(OpCodes.Ldarg_1);
return;
case 2:
il.Emit(OpCodes.Ldarg_2);
return;
case 3:
il.Emit(OpCodes.Ldarg_3);
return;
case { } n when n < 256:
il.Emit(OpCodes.Ldarg_S, (byte)index);
return;
default:
il.Emit(OpCodes.Ldarg, (short)index);
return;
}
}
public override void Emit(IMemberEmitter member, ILGenerator gen)
{
ArgumentsUtil.EmitLoadOwnerAndReference(reference, gen);
var notNull = gen.DefineLabel();
gen.Emit(OpCodes.Brtrue_S, notNull);
ifNull.Emit(member, gen);
gen.MarkLabel(notNull);
if (ifNotNull != null) // yeah, I know that reads funny :)
{
ifNotNull.Emit(member, gen);
}
}
bool Emit(IILEmitter emitter, ref Local local, bool upper, bool invert, Instruction falseTarget)
{
var ic = upper ? _upper : _lower;
if (!ic.HasValue)
{
return(false);
}
var c = Base.Lang.Ints.Const(ic.Value.Value, Bytes, Signed);
var compiler = new ExprCompiler(emitter);
if (invert)
{
if (local == null)
{
local = emitter.RequestTempLocal(c.Type);
emitter.Stloc(local);
}
compiler.Compile(c);
emitter.Ldloc(local);
var op = DnextFactory.CondBranch(upper, !ic.Value.Inclusive, Signed);
emitter.Emit(op, falseTarget);
}
else
{
if (local != null)
{
emitter.Ldloc(local);
}
compiler.Compile(c);
var op = DnextFactory.CondBranch(!upper, !ic.Value.Inclusive, Signed);
emitter.Emit(op, falseTarget);
}
return(true);
}
/// <summary>
/// Emits call to the method that contains de-mangler (injected as an <see cref="InjectedFeature"/>).
/// This is to replace instruction(s) that load original constant in the IL
/// </summary>
/// <param name="emitter">IL emitter</param>
/// <param name="rng">Pseudo-random number generator</param>
/// <param name="instance">instance of the class where the method with injected de-mangler is located</param>
/// <param name="mangled">mangled value</param>
public void EmitCall(IILEmitter emitter, IRng rng, Local instance, object mangled)
{
var pi = Input is Var.Arg a ? a.Parameter : null;
if (pi == null)
{
emitter.Ldloc(instance);
Codec.LoadValue(emitter, mangled, true);
Codec.EmitConversion(emitter, mangled.GetType(), Input.Type.ElementType.ToType());
((Var.Fld)Input).Stfld(emitter);
}
var method = Method.Method;
emitter.Ldloc(instance);
foreach (var pd in method.Parameters)
{
if (pd.IsNormalMethodParameter)
{
if (pi == pd)
{
Codec.LoadValue(emitter, mangled, true);
Codec.EmitConversion(emitter, mangled.GetType(), pd.Type.ElementType.ToType());
}
else
{
Utils.RandomConst(emitter, pd.Type, rng);
}
}
}
emitter.Callvirt(emitter.Importer.Import(method));
if (method.HasReturnType)
{
if ((Output.Flags & VarFlags.Ret) == 0)
{
emitter.Emit(OpCodes.Pop);
}
}
if (Output is Var.Fld f)
{
emitter.Ldloc(instance);
f.Ldfld(emitter);
}
}
public void EmitNew(IILEmitter emitter, IRng rng, Local instance)
{
var ctor = Flag.Type.Ctors.RandomElementOrDefault(rng);
if (ctor == null || (Flag.Ctor != null && rng.NextBoolean()))
{
foreach (var pd in Flag.Ctor.Parameters)
{
if (pd.IsNormalMethodParameter)
{
if (pd == Flag.FlagParameter)
{
EmitFlagValue(emitter, rng);
}
else
{
Utils.RandomConst(emitter, pd.Type, rng);
}
}
}
emitter.Newobj(emitter.Importer.Import(Flag.Ctor));
emitter.Stloc(instance);
}
else
{
foreach (var pd in ctor.Parameters)
{
if (pd.IsNormalMethodParameter)
{
Utils.RandomConst(emitter, pd.Type, rng);
}
}
emitter.Newobj(emitter.Importer.Import(ctor));
emitter.Stloc(instance);
emitter.Ldloc(instance);
EmitFlagValue(emitter, rng);
emitter.Emit(OpCodes.Stfld, emitter.Importer.Import(Flag.Field));
}
}
public void ConvertTo(IILEmitter emitter, ElementType to)
{
switch (to)
{
case ElementType.I1:
emitter.Emit(OpCodes.Conv_I1);
break;
case ElementType.I2:
emitter.Emit(OpCodes.Conv_I2);
break;
case ElementType.I4:
emitter.Emit(OpCodes.Conv_I4);
break;
case ElementType.I8:
emitter.Emit(OpCodes.Conv_I8);
break;
case ElementType.U1:
emitter.Emit(OpCodes.Conv_U1);
break;
case ElementType.U2:
emitter.Emit(OpCodes.Conv_U2);
break;
case ElementType.U4:
emitter.Emit(OpCodes.Conv_U4);
break;
case ElementType.U8:
emitter.Emit(OpCodes.Conv_U8);
break;
}
}
public static IILEmitter Emit(this IILEmitter emitter, OpCode code, ITypeDefOrRef type) => emitter.Emit(Instruction.Create(code, type));
public static IILEmitter Switch(this IILEmitter emitter, IList <Instruction> targets) => emitter.Emit(Instruction.Create(OpCodes.Switch, targets));
public static IILEmitter Emit(this IILEmitter emitter, OpCode code, Instruction target) => emitter.Emit(Instruction.Create(code, target));
public static IILEmitter Emit(this IILEmitter emitter, OpCode code, string v) => emitter.Emit(Instruction.Create(code, v));
public static IILEmitter Emit(this IILEmitter emitter, OpCode code, Local l) => emitter.Emit(Instruction.Create(code, l));
public static IILEmitter Emit(this IILEmitter emitter, OpCode code, Parameter p) => emitter.Emit(Instruction.Create(code, p));
public static IILEmitter Emit(this IILEmitter emitter, OpCode code, MethodSig ms) => emitter.Emit(Instruction.Create(code, ms));
public static IILEmitter Emit(this IILEmitter emitter, OpCode code, ITokenOperand to) => emitter.Emit(Instruction.Create(code, to));
public static IILEmitter Emit(this IILEmitter emitter, OpCode code, IField f) => emitter.Emit(Instruction.Create(code, f));
public static void RandomConst(IILEmitter il, TypeSig t, IRng rng)
{
switch (t.ElementType)
{
case ElementType.I1:
il.Const(rng.NextInt8());
break;
case ElementType.I2:
il.Const(rng.NextInt16());
break;
case ElementType.I4:
il.Const(rng.NextInt32());
break;
case ElementType.I8:
il.Const(rng.NextInt64());
break;
case ElementType.U1:
il.Const(rng.NextUInt8());
break;
case ElementType.U2:
il.Const(rng.NextUInt16());
break;
case ElementType.U4:
il.Const(rng.NextUInt32());
break;
case ElementType.U8:
il.Const(rng.NextUInt64());
break;
case ElementType.R4:
il.Const(rng.NextFloat());
break;
case ElementType.R8:
il.Const(rng.NextDouble());
break;
case ElementType.Char:
il.Const((char)rng.NextUInt16());
break;
case ElementType.Boolean:
il.Const(rng.NextBoolean());
break;
default:
if (t.IsValueType)
{
var it = il.Importer.Import(t);
using (il.UseTempLocal(it, out var l))
{
il.Ldloca(l);
il.Initobj(new TypeSpecUser(it));
il.Ldloc(l);
}
}
else
{
il.Emit(OpCodes.Ldnull);
}
break;
}
}
private void EmitCastToType(Type typeFrom, Type typeTo)
{
if (!typeFrom.IsValueType && typeTo.IsValueType)
{
_ilg.Emit(OpCodes.Unbox_Any, _ilg.Importer.Import(typeTo));
return;
}
if (typeFrom.IsValueType && !typeTo.IsValueType)
{
_ilg.Emit(OpCodes.Box, _ilg.Importer.Import(typeFrom));
if (typeTo != typeof(object))
{
_ilg.Emit(OpCodes.Castclass, _ilg.Importer.Import(typeTo));
return;
}
return;
}
if (!typeFrom.IsValueType && !typeTo.IsValueType)
{
_ilg.Emit(OpCodes.Castclass, _ilg.Importer.Import(typeTo));
return;
}
throw new NotSupportedException($"{typeFrom} => {typeTo}");
}
public override void Load(IILEmitter emitter)
{
emitter.Emit(OpCodes.Ldarg_0);
Ldfld(emitter);
}
public static IILEmitter Emit(this IILEmitter emitter, OpCode code, MemberRef mr) => emitter.Emit(Instruction.Create(code, mr));
public void Ldfld(IILEmitter emitter)
{
emitter.Emit(Instruction.Create(OpCodes.Ldfld, _resolver?.Invoke(Field) ?? Field));
}