public static void DecodeMethodImplAttribute <T, TAttributeSyntaxNode, TAttributeData, TAttributeLocation>(
ref DecodeWellKnownAttributeArguments <TAttributeSyntaxNode, TAttributeData, TAttributeLocation> arguments,
CommonMessageProvider messageProvider)
where T : CommonMethodWellKnownAttributeData, new()
where TAttributeSyntaxNode : GreenNode
where TAttributeData : AttributeData
{
Debug.Assert((object)arguments.AttributeSyntaxOpt != null);
MethodImplOptions options;
var attribute = arguments.Attribute;
if (attribute.CommonConstructorArguments.Length == 1)
{
if (attribute.AttributeConstructor.Parameters[0].Type.SpecialType == SpecialType.System_Int16)
{
options = (MethodImplOptions)attribute.CommonConstructorArguments[0].DecodeValue <short>(SpecialType.System_Int16);
}
else
{
options = attribute.CommonConstructorArguments[0].DecodeValue <MethodImplOptions>(SpecialType.System_Enum);
}
// low two bits should only be set via MethodCodeType property
if (((int)options & 3) != 0)
{
messageProvider.ReportInvalidAttributeArgument(arguments.Diagnostics, arguments.AttributeSyntaxOpt, 0, attribute);
options = options & ~(MethodImplOptions)3;
}
}
else
{
options = default(MethodImplOptions);
}
MethodImplAttributes codeType = MethodImplAttributes.IL;
int position = 1;
foreach (var namedArg in attribute.CommonNamedArguments)
{
if (namedArg.Key == "MethodCodeType")
{
var value = (MethodImplAttributes)namedArg.Value.DecodeValue <int>(SpecialType.System_Enum);
if (value < 0 || value > MethodImplAttributes.Runtime)
{
messageProvider.ReportInvalidNamedArgument(arguments.Diagnostics, arguments.AttributeSyntaxOpt, position, attribute.AttributeClass, "MethodCodeType");
}
else
{
codeType = value;
}
}
position++;
}
arguments.GetOrCreateData <T>().SetMethodImplementation(arguments.Index, (MethodImplAttributes)options | codeType);
}
public static void DecodeStructLayoutAttribute <TTypeWellKnownAttributeData, TAttributeSyntaxNode, TAttributeData, TAttributeLocation>(
ref DecodeWellKnownAttributeArguments <TAttributeSyntaxNode, TAttributeData, TAttributeLocation> arguments,
CharSet defaultCharSet,
int defaultAutoLayoutSize,
CommonMessageProvider messageProvider)
where TTypeWellKnownAttributeData : CommonTypeWellKnownAttributeData, new()
where TAttributeSyntaxNode : GreenNode
where TAttributeData : AttributeData
{
Debug.Assert((object)arguments.AttributeSyntaxOpt != null);
var attribute = arguments.Attribute;
CharSet charSet = (defaultCharSet != Constants.CharSet_None) ? defaultCharSet : CharSet.Ansi;
int? size = null;
int? alignment = null;
bool hasErrors = false;
LayoutKind kind = attribute.CommonConstructorArguments[0].DecodeValue <LayoutKind>(SpecialType.System_Enum);
switch (kind)
{
case LayoutKind.Auto:
case LayoutKind.Explicit:
case LayoutKind.Sequential:
break;
default:
messageProvider.ReportInvalidAttributeArgument(arguments.Diagnostics, arguments.AttributeSyntaxOpt, 0, attribute);
hasErrors = true;
break;
}
int position = 1;
foreach (var namedArg in attribute.CommonNamedArguments)
{
switch (namedArg.Key)
{
case "CharSet":
charSet = namedArg.Value.DecodeValue <CharSet>(SpecialType.System_Enum);
switch (charSet)
{
case Constants.CharSet_None:
charSet = CharSet.Ansi;
break;
case CharSet.Ansi:
case Constants.CharSet_Auto:
case CharSet.Unicode:
break;
default:
messageProvider.ReportInvalidNamedArgument(arguments.Diagnostics, arguments.AttributeSyntaxOpt, position, attribute.AttributeClass, namedArg.Key);
hasErrors = true;
break;
}
break;
case "Pack":
alignment = namedArg.Value.DecodeValue <int>(SpecialType.System_Int32);
// only powers of 2 less or equal to 128 are allowed:
if (alignment > 128 || (alignment & (alignment - 1)) != 0)
{
messageProvider.ReportInvalidNamedArgument(arguments.Diagnostics, arguments.AttributeSyntaxOpt, position, attribute.AttributeClass, namedArg.Key);
hasErrors = true;
}
break;
case "Size":
size = namedArg.Value.DecodeValue <int>(SpecialType.System_Int32);
if (size < 0)
{
messageProvider.ReportInvalidNamedArgument(arguments.Diagnostics, arguments.AttributeSyntaxOpt, position, attribute.AttributeClass, namedArg.Key);
hasErrors = true;
}
break;
}
position++;
}
if (!hasErrors)
{
if (kind == LayoutKind.Auto && size == null && alignment != null)
{
// If size is unspecified
// C# emits size=0
// VB emits size=1 if the type is a struct, auto-layout and has alignment specified; 0 otherwise
size = defaultAutoLayoutSize;
}
arguments.GetOrCreateData <TTypeWellKnownAttributeData>().SetStructLayout(new TypeLayout(kind, size ?? 0, (byte)(alignment ?? 0)), charSet);
}
}