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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.
// See the LICENSE file in the project root for more information.
//
// sigparser.cpp
//
//
// Signature parsing code
//
#include "stdafx.h"
#include "sigparser.h"
#include "contract.h"
HRESULT SigParser::SkipExactlyOne()
{
CONTRACTL
{
INSTANCE_CHECK;
NOTHROW;
GC_NOTRIGGER;
FORBID_FAULT;
SUPPORTS_DAC;
}
CONTRACTL_END
CorElementType typ;
HRESULT hr = GetElemType(&typ);
IfFailRet(hr);
if (!CorIsPrimitiveType(typ))
{
switch ((DWORD)typ)
{
default:
// _ASSERT(!"Illegal or unimplement type in COM+ sig.");
return META_E_BAD_SIGNATURE;
break;
case ELEMENT_TYPE_VAR:
case ELEMENT_TYPE_MVAR:
IfFailRet(GetData(NULL)); // Skip variable number
break;
case ELEMENT_TYPE_VAR_ZAPSIG:
IfFailRet(GetData(NULL)); // Skip RID
break;
case ELEMENT_TYPE_OBJECT:
case ELEMENT_TYPE_STRING:
case ELEMENT_TYPE_TYPEDBYREF:
case ELEMENT_TYPE_CANON_ZAPSIG:
break;
case ELEMENT_TYPE_BYREF: //fallthru
case ELEMENT_TYPE_PTR:
case ELEMENT_TYPE_PINNED:
case ELEMENT_TYPE_SZARRAY:
case ELEMENT_TYPE_NATIVE_ARRAY_TEMPLATE_ZAPSIG:
case ELEMENT_TYPE_NATIVE_VALUETYPE_ZAPSIG:
IfFailRet(SkipExactlyOne()); // Skip referenced type
break;
case ELEMENT_TYPE_VALUETYPE: //fallthru
case ELEMENT_TYPE_CLASS:
IfFailRet(GetToken(NULL)); // Skip RID
break;
case ELEMENT_TYPE_MODULE_ZAPSIG:
IfFailRet(GetData(NULL)); // Skip index
IfFailRet(SkipExactlyOne()); // Skip type
break;
case ELEMENT_TYPE_FNPTR:
IfFailRet(SkipSignature());
break;
case ELEMENT_TYPE_ARRAY:
{
IfFailRet(SkipExactlyOne()); // Skip element type
ULONG rank;
IfFailRet(GetData(&rank)); // Get rank
if (rank)
{
ULONG nsizes;
IfFailRet(GetData(&nsizes)); // Get # of sizes
while (nsizes--)
{
IfFailRet(GetData(NULL)); // Skip size
}
ULONG nlbounds;
IfFailRet(GetData(&nlbounds)); // Get # of lower bounds
while (nlbounds--)
{
IfFailRet(GetData(NULL)); // Skip lower bounds
}
}
}
break;
case ELEMENT_TYPE_SENTINEL:
// Should be unreachable since GetElem strips it
break;
case ELEMENT_TYPE_INTERNAL:
IfFailRet(GetPointer(NULL));
break;
case ELEMENT_TYPE_GENERICINST:
IfFailRet(SkipExactlyOne()); // Skip generic type
ULONG argCnt;
IfFailRet(GetData(&argCnt)); // Get number of parameters
while (argCnt--)
{
IfFailRet(SkipExactlyOne()); // Skip the parameters
}
break;
}
}
return hr;
}
//---------------------------------------------------------------------------------------
//
// Skip only a method header signature - not the sigs of the args to the method.
//
HRESULT
SigParser::SkipMethodHeaderSignature(
ULONG * pcArgs)
{
CONTRACTL
{
INSTANCE_CHECK;
NOTHROW;
GC_NOTRIGGER;
FORBID_FAULT;
SUPPORTS_DAC;
}
CONTRACTL_END
HRESULT hr = S_OK;
// Skip calling convention
ULONG uCallConv;
IfFailRet(GetCallingConvInfo(&uCallConv));
if ((uCallConv == IMAGE_CEE_CS_CALLCONV_FIELD) ||
(uCallConv == IMAGE_CEE_CS_CALLCONV_LOCAL_SIG))
{
return META_E_BAD_SIGNATURE;
}
// Skip type parameter count
if (uCallConv & IMAGE_CEE_CS_CALLCONV_GENERIC)
IfFailRet(GetData(NULL));
// Get arg count;
IfFailRet(GetData(pcArgs));
// Skip return type;
IfFailRet(SkipExactlyOne());
return hr;
} // SigParser::SkipMethodHeaderSignature
//---------------------------------------------------------------------------------------
//
// Skip a sub signature (as immediately follows an ELEMENT_TYPE_FNPTR).
HRESULT SigParser::SkipSignature()
{
CONTRACTL
{
INSTANCE_CHECK;
NOTHROW;
GC_NOTRIGGER;
FORBID_FAULT;
SUPPORTS_DAC;
}
CONTRACTL_END
HRESULT hr = S_OK;
ULONG cArgs;
IfFailRet(SkipMethodHeaderSignature(&cArgs));
// Skip args.
while (cArgs) {
IfFailRet(SkipExactlyOne());
cArgs--;
}
return hr;
}
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