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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System;
using System.Reflection.Metadata;
using System.Reflection.Metadata.Ecma335;
namespace Internal.TypeSystem.Ecma
{
public struct EcmaSignatureTranslator
{
private BlobReader _input;
private BlobBuilder _output;
private Func<int, int> _getAlternateStreamToken;
public EcmaSignatureTranslator(BlobReader input, BlobBuilder output, Func<int, int> getAlternateStreamToken)
{
_input = input;
_output = output;
_getAlternateStreamToken = getAlternateStreamToken;
}
// Various parsing functions for processing through the locals of a function and translating them to the
// alternate form with new tokens.
private int ParseCompressedInt()
{
int value = _input.ReadCompressedInteger();
_output.WriteCompressedInteger(value);
return value;
}
private int ParseCompressedSignedInt()
{
int value = _input.ReadCompressedSignedInteger();
_output.WriteCompressedSignedInteger(value);
return value;
}
private byte ParseByte()
{
byte value = _input.ReadByte();
_output.WriteByte(value);
return value;
}
private byte PeekByte()
{
byte value = _input.ReadByte();
_input.Offset--;
return value;
}
public void ParseMemberRefSignature()
{
byte sigHeader = PeekByte();
if (sigHeader == (byte)SignatureKind.Field)
ParseFieldSignature();
else
ParseMethodSignature();
}
public void ParseFieldSignature()
{
byte sigHeader = ParseByte();
if (sigHeader != (byte)SignatureKind.Field)
throw new BadImageFormatException();
ParseType();
}
public void ParseMethodSignature()
{
byte sigHeader = ParseByte();
if (((int)sigHeader & (int)SignatureAttributes.Generic) == (int)SignatureAttributes.Generic)
{
// Parse arity
ParseCompressedInt();
}
int argCount = ParseCompressedInt();
for (int i = 0; i <= argCount; i++)
ParseType();
}
public void ParseLocalsSignature()
{
byte sigHeader = ParseByte();
if ((SignatureKind)sigHeader != SignatureKind.LocalVariables)
throw new BadImageFormatException();
int localsCount = ParseCompressedInt();
for (int i = 0; i < localsCount; i++)
{
ParseType();
}
}
public void ParseMethodSpecSignature()
{
byte sigHeader = ParseByte();
if ((SignatureKind)sigHeader != SignatureKind.MethodSpecification)
{
throw new BadImageFormatException();
}
int argCount = ParseCompressedInt();
for (int i = 0; i < argCount; i++)
{
ParseType();
}
}
private void ParseTypeHandle()
{
int token = MetadataTokens.GetToken(_input.ReadTypeHandle());
int newToken = _getAlternateStreamToken(token);
int newEncodedHandle = CodedIndex.TypeDefOrRefOrSpec(MetadataTokens.EntityHandle(newToken));
_output.WriteCompressedInteger(newEncodedHandle);
}
public void ParseType()
{
SignatureTypeCode typeCode;
for (; ; )
{
int sigcodeRaw = ParseCompressedInt();
const int ELEMENT_TYPE_CLASS = 0x12;
const int ELEMENT_TYPE_VALUETYPE = 0x11;
if (sigcodeRaw == ELEMENT_TYPE_CLASS || sigcodeRaw == ELEMENT_TYPE_VALUETYPE)
typeCode = SignatureTypeCode.TypeHandle;
else
typeCode = (SignatureTypeCode)sigcodeRaw;
switch (typeCode)
{
case SignatureTypeCode.RequiredModifier:
case SignatureTypeCode.OptionalModifier:
ParseTypeHandle();
continue;
case SignatureTypeCode.Pinned:
case SignatureTypeCode.Sentinel:
continue;
}
break;
}
switch (typeCode)
{
case SignatureTypeCode.Void:
case SignatureTypeCode.Boolean:
case SignatureTypeCode.SByte:
case SignatureTypeCode.Byte:
case SignatureTypeCode.Int16:
case SignatureTypeCode.UInt16:
case SignatureTypeCode.Int32:
case SignatureTypeCode.UInt32:
case SignatureTypeCode.Int64:
case SignatureTypeCode.UInt64:
case SignatureTypeCode.Single:
case SignatureTypeCode.Double:
case SignatureTypeCode.Char:
case SignatureTypeCode.String:
case SignatureTypeCode.IntPtr:
case SignatureTypeCode.UIntPtr:
case SignatureTypeCode.Object:
case SignatureTypeCode.TypedReference:
break;
case SignatureTypeCode.TypeHandle:
ParseTypeHandle();
break;
case SignatureTypeCode.SZArray:
case SignatureTypeCode.ByReference:
case SignatureTypeCode.Pointer:
{
ParseType();
break;
}
case SignatureTypeCode.Array:
{
ParseType();
/*var rank = */ParseCompressedInt();
var boundsCount = ParseCompressedInt();
for (int i = 0; i < boundsCount; i++)
ParseCompressedInt();
var lowerBoundsCount = ParseCompressedInt();
for (int j = 0; j < lowerBoundsCount; j++)
ParseCompressedSignedInt();
break;
}
case SignatureTypeCode.GenericTypeParameter:
case SignatureTypeCode.GenericMethodParameter:
ParseCompressedInt();
break;
case SignatureTypeCode.GenericTypeInstance:
{
ParseType();
int instanceLength = ParseCompressedInt();
for (int i = 0; i < instanceLength; i++)
{
ParseType();
}
break;
}
case SignatureTypeCode.FunctionPointer:
ParseMethodSignature();
break;
default:
ThrowHelper.ThrowBadImageFormatException();
return;
}
}
}
}
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