/// <summary>
/// Creates a new <see cref="FunctionImport"/> instance with the provided <see cref="Delegate"/>.
/// </summary>
/// <param name="del">The delegate to use for the import.</param>
/// <exception cref="ArgumentNullException">No parameters can be null.</exception>
/// <exception cref="ArgumentException">A parameter or return type is not compatible with WebAssembly.</exception>
public FunctionImport(Delegate del)
{
if (del == null)
{
throw new ArgumentNullException(nameof(del));
}
var method = (this.Method = del).GetMethodInfo();
if (method == null)
{
throw new ArgumentException("Provided delegate isn't associated with a method.", nameof(del));
}
this.Type = new WebAssemblyType();
if (method.ReturnType != typeof(void))
{
if (!method.ReturnType.TryConvertToValueType(out var type))
{
throw new ArgumentException($"Return type {method.ReturnType} is not compatible with WebAssembly.", nameof(del));
}
this.Type.Returns = new[] { type };
}
foreach (var parameter in method.GetParameters())
{
if (!parameter.ParameterType.TryConvertToValueType(out var type))
{
throw new ArgumentException($"Parameter type {parameter} is not compatible with WebAssembly.", nameof(del));
}
this.Type.Parameters.Add(type);
}
}
public TableType(WebAssemblyType element_type, ResizeLimit limits)
{
if (element_type != WebAssemblyType.anyfunc)
{
throw new ArgumentException(nameof(element_type));
}
this.element_type = element_type;
this.limits = limits ?? throw new ArgumentException(nameof(limits));
}
public GlobalType(WebAssemblyType content_type, bool mutability)
{
if (!WebAssemblyHelper.IsValueType(content_type))
{
throw new ArgumentException(nameof(content_type));
}
this.content_type = content_type;
this.mutability = mutability;
}
public LocalEntry(uint count, WebAssemblyType type)
{
if (!Enum.IsDefined(typeof(WebAssemblyType), type))
{
throw new ArgumentException(nameof(type));
}
this.count = count;
this.type = type;
}
public TableType(BinaryReader reader)
{
sbyte type = LEB128.ReadInt7(reader);
if (type != (int)WebAssemblyType.anyfunc)
{
throw new Exception($"File is invalid. Expected byte '{WebAssemblyType.anyfunc}', received '{type}'.");
}
element_type = WebAssemblyType.anyfunc;
limits = new ResizeLimit(reader);
}
private ValueObject GetValueOfTypeOrFail(WebAssemblyType expected_type)
{
ValueObject obj = GetValueOrFail();
if (obj.type != expected_type)
{
logger.Debug($"Expected type of {expected_type} but got {obj.type}.");
Trap("Function stack corrupt.");
}
return(obj);
}
public LocalEntry(BinaryReader reader)
{
count = LEB128.ReadUInt32(reader);
var tmp_type = reader.ReadByte();
if (!Enum.IsDefined(typeof(WebAssemblyType), tmp_type))
{
throw new Exception($"File is invalid. Expected WebAssemblyType, received '{tmp_type}'.");
}
type = (WebAssemblyType)tmp_type;
}
internal static bool IsValueType(WebAssemblyType type)
{
switch (type)
{
case WebAssemblyType.i32:
case WebAssemblyType.i64:
case WebAssemblyType.f32:
case WebAssemblyType.f64:
return(true);
default:
return(false);
}
}
public GlobalType(BinaryReader reader)
{
content_type = (WebAssemblyType)LEB128.ReadUInt7(reader);
if (!WebAssemblyHelper.IsValueType(content_type))
{
throw new Exception($"File is invalid. Expected value type, received '{content_type}'.");
}
byte mut = LEB128.ReadUInt7(reader);
if (mut != 0 && mut != 1)
{
throw new Exception($"File is invalid. Expected 0 or 1, received '{mut}'.");
}
mutability = mut != 0;
}
public TableInstance(WebAssemblyType type, uint initial, uint?maximum)
{
this.type = type;
mem = new WebAssemblyMemoryManager(initial, maximum ?? uint.MaxValue);
}
public GlobalInstance(bool is_mutable, WebAssemblyType type, ValueObject value)
{
this.is_mutable = is_mutable;
this.type = type;
this.value = value;
}
public ValueObject(double value)
{
type = WebAssemblyType.f64;
this.value = value;
}
public ValueObject(float value)
{
type = WebAssemblyType.f32;
this.value = value;
}
public ValueObject(ulong value)
{
type = WebAssemblyType.i64;
this.value = value;
}
public ValueObject(uint value)
{
type = WebAssemblyType.i32;
this.value = value;
}
private (ValueObject value, byte[] memory, int location) StoreOrFail(byte[] code, uint size, WebAssemblyType type, ref uint pc)
{
// align is in bytes
// it tells us how this value is aligned
// in our implementation, we can disregard alignment
int align = 1 << (int)LEB128.ReadUInt32(code, ref pc);
uint offset = LEB128.ReadUInt32(code, ref pc);
ValueObject c = GetValueOfTypeOrFail(type);
ValueObject i = GetValueOfTypeOrFail(WebAssemblyType.i32);
long ea = i.AsI32() + offset;
uint N = size / 8;
if ((ea + N) > ctx.linear_memory[0].size)
{
Trap("Illegal memory access");
}
logger.ConditionalTrace($"Memory location calculated = {ea}.");
return(c, ctx.linear_memory[0].memory, (int)ea);
}