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zapsig.cpp
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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.
// ===========================================================================
// File: zapsig.cpp
//
//
// This module contains helper functions used to encode and manipulate
// signatures for scenarios where runtime-specific signatures
// including specific generic instantiations are persisted,
// like Ready-To-Run decoding, and Multi-core JIT recording/playback
//
// ===========================================================================
#include "common.h"
#include "zapsig.h"
#include "typedesc.h"
#include "sigbuilder.h"
#include "nativeimage.h"
#ifndef DACCESS_COMPILE
BOOL ZapSig::GetSignatureForTypeDesc(TypeDesc * desc, SigBuilder * pSigBuilder)
{
CONTRACTL
{
THROWS;
GC_TRIGGERS;
}
CONTRACTL_END
CorElementType elemType = desc->GetInternalCorElementType();
if (elemType == ELEMENT_TYPE_VALUETYPE)
{
// convert to ELEMENT_TYPE_NATIVE_VALUETYPE_ZAPSIG so that the right
// thing will happen in code:SigPointer.GetTypeHandleThrowing
elemType = (CorElementType) ELEMENT_TYPE_NATIVE_VALUETYPE_ZAPSIG;
}
else if (elemType == ELEMENT_TYPE_VAR || elemType == ELEMENT_TYPE_MVAR)
{
// Enable encoding of type variables for R2R signature only.
if (context.externalTokens == ZapSig::NormalTokens)
elemType = (CorElementType) ELEMENT_TYPE_VAR_ZAPSIG;
}
pSigBuilder->AppendElementType(elemType);
if (desc->HasTypeParam())
{
if (!this->GetSignatureForTypeHandle(desc->GetTypeParam(), pSigBuilder))
return FALSE;
}
else
{
switch ((DWORD)elemType)
{
case ELEMENT_TYPE_FNPTR:
{
FnPtrTypeDesc *pTD = dac_cast<PTR_FnPtrTypeDesc>(desc);
// Emit calling convention
pSigBuilder->AppendByte(pTD->GetCallConv());
// number of args
unsigned numArgs = pTD->GetNumArgs();
pSigBuilder->AppendData(numArgs);
// return type and args
TypeHandle *retAndArgTypes = pTD->GetRetAndArgTypesPointer();
for (DWORD i = 0; i <= numArgs; i++)
{
TypeHandle th = retAndArgTypes[i];
// This should be a consequence of the type key being restored
CONSISTENCY_CHECK(!th.IsNull());
if (!this->GetSignatureForTypeHandle(th, pSigBuilder))
return FALSE;
}
}
break;
case ELEMENT_TYPE_MVAR:
// _ASSERTE(!"Cannot encode ET_MVAR in a ZapSig");
return FALSE;
case ELEMENT_TYPE_VAR:
// _ASSERTE(!"Cannot encode ET_VAR in a ZapSig");
return FALSE;
case ELEMENT_TYPE_VAR_ZAPSIG:
{
TypeVarTypeDesc * pTypeVarDesc = dac_cast<PTR_TypeVarTypeDesc>(desc);
Module * pVarTypeModule = pTypeVarDesc->GetModule();
if (pVarTypeModule != this->context.pInfoModule)
{
DWORD index = (*this->pfnEncodeModule)(this->context.pModuleContext, pVarTypeModule);
if (index == ENCODE_MODULE_FAILED)
return FALSE;
// emit the ET_MODULE_ZAPSIG escape
pSigBuilder->AppendElementType((CorElementType) ELEMENT_TYPE_MODULE_ZAPSIG);
// emit the module index
pSigBuilder->AppendData(index);
}
pSigBuilder->AppendData(RidFromToken(pTypeVarDesc->GetToken()));
break;
}
default:
_ASSERTE(!"Bad type");
return FALSE;
}
}
return TRUE;
}
// Create a signature for a typeHandle
// It can be decoded using MetaSig::GetTypeHandleThrowing
// The tokens are espressed relative to this->pInfoModule
// When handle.GetModule() != this->pInfoModule), we escape the signature
// with an ELEMENT_TYPE_MODULE_ZAPSIG <id-num> <token> to encode
// a temporary change of module
//
// Returns the number of characters written into the buffer.
// If buffer and bufferMax are NULL, it returns the number of
// characters that would have been written.
// If the buffer isn't big enough it doesn't write past bufferMax
// A return value of 0 indidates a failure to encode the signature
//
BOOL ZapSig::GetSignatureForTypeHandle(TypeHandle handle,
SigBuilder * pSigBuilder)
{
CONTRACTL
{
THROWS;
GC_TRIGGERS;
PRECONDITION(CheckPointer(handle));
PRECONDITION(CheckPointer(this->context.pInfoModule));
MODE_ANY;
}
CONTRACTL_END
if (handle.IsTypeDesc())
return GetSignatureForTypeDesc(handle.AsTypeDesc(), pSigBuilder);
MethodTable *pMT = handle.AsMethodTable();
// Can we encode the type using a short ET encoding?
//
CorElementType elemType = TryEncodeUsingShortcut(pMT);
if (elemType != ELEMENT_TYPE_END)
{
_ASSERTE(pMT->IsTypicalTypeDefinition());
// Check for an array type and encode that we are dealing with a MethodTable representation
if (elemType == ELEMENT_TYPE_SZARRAY || elemType == ELEMENT_TYPE_ARRAY)
{
pSigBuilder->AppendElementType(elemType);
TypeHandle elementType = pMT->GetArrayElementTypeHandle();
if (!this->GetSignatureForTypeHandle(elementType, pSigBuilder))
return FALSE;
if (elemType == ELEMENT_TYPE_ARRAY)
{
pSigBuilder->AppendData(pMT->GetRank());
pSigBuilder->AppendData(0);
pSigBuilder->AppendData(0);
}
}
else
{
pSigBuilder->AppendElementType(elemType);
}
return TRUE;
}
// We could not encode the type using a short encoding
// and we have a handle that represents a Class or ValueType
// We may need to emit an out-of-module escape sequence
//
Module *pTypeHandleModule = pMT->GetModule();
// If the type handle's module is different that the this->pInfoModule
// we will need to add an out-of-module escape for the type
//
DWORD index = 0;
mdToken token = pMT->GetCl();
if (pTypeHandleModule != this->context.pInfoModule)
{
// During multicorejit this calls
// code:MulticoreJitManager.EncodeModuleHelper
//
index = (*this->pfnEncodeModule)(this->context.pModuleContext, pTypeHandleModule);
if (index == ENCODE_MODULE_FAILED)
return FALSE;
// emit the ET_MODULE_ZAPSIG escape
pSigBuilder->AppendElementType((CorElementType) ELEMENT_TYPE_MODULE_ZAPSIG);
// emit the module index
pSigBuilder->AppendData(index);
}
// Remember if we have an instantiated generic type
bool fNeedsInstantiation = pMT->HasInstantiation() && !pMT->IsGenericTypeDefinition();
// We possibly have an instantiated generic type
if (fNeedsInstantiation)
{
pSigBuilder->AppendElementType(ELEMENT_TYPE_GENERICINST);
}
// Beware of enums! Can't use GetInternalCorElementType() here.
pSigBuilder->AppendElementType(pMT->IsValueType() ? ELEMENT_TYPE_VALUETYPE : ELEMENT_TYPE_CLASS);
_ASSERTE(!IsNilToken(token));
if (IsNilToken(token))
return FALSE;
if ((index != 0) && (this->pfnTokenDefinition != NULL))
{
(*this->pfnTokenDefinition)(this->context.pModuleContext, pTypeHandleModule, index, &token);
token = TokenFromRid(RidFromToken(token), mdtTypeDef);
}
pSigBuilder->AppendToken(token);
if (fNeedsInstantiation)
{
pSigBuilder->AppendData(pMT->GetNumGenericArgs());
Instantiation inst = pMT->GetInstantiation();
for (DWORD i = 0; i < inst.GetNumArgs(); i++)
{
TypeHandle t = inst[i];
CONSISTENCY_CHECK(!t.IsNull());
if (!this->GetSignatureForTypeHandle(t, pSigBuilder))
return FALSE;
}
}
return TRUE;
}
#endif // #ifndef DACCESS_COMPILE
//
// Returns element type when the typeHandle can be encoded using
// using a single CorElementType value
// This includes using ELEMENT_TYPE_CANON_ZAPSIG for the System.__Canon type
//
/*static */ CorElementType ZapSig::TryEncodeUsingShortcut(/* in */ MethodTable * pMT)
{
LIMITED_METHOD_CONTRACT;
CorElementType elemType = ELEMENT_TYPE_END; // An illegal value that we check for later
// Set elemType to a shortcut encoding whenever possible
//
if (pMT->IsTruePrimitive())
elemType = pMT->GetInternalCorElementType();
else if (pMT == g_pObjectClass)
elemType = ELEMENT_TYPE_OBJECT;
else if (pMT == g_pStringClass)
elemType = ELEMENT_TYPE_STRING;
else if (pMT == g_pCanonMethodTableClass)
elemType = (CorElementType) ELEMENT_TYPE_CANON_ZAPSIG;
else if (pMT->IsArray())
elemType = pMT->GetInternalCorElementType(); // either ELEMENT_TYPE_SZARRAY or ELEMENT_TYPE_ARRAY
return elemType;
}
//
// Compare a metadata signature element with a type handle
// The type handle must have a fully restored type key, which in turn means that modules for all of its
// components are loaded (e.g. type arguments to an instantiated type).
//
// Hence we can do the signature comparison without incurring any loads or restores.
//
/*static*/ BOOL ZapSig::CompareSignatureToTypeHandle(PCCOR_SIGNATURE pSig,
ModuleBase* pModule,
TypeHandle handle,
const ZapSig::Context * pZapSigContext)
{
CONTRACT(BOOL)
{
NOTHROW;
GC_NOTRIGGER;
MODE_ANY;
FORBID_FAULT;
PRECONDITION(CheckPointer(pModule));
PRECONDITION(CheckPointer(pZapSigContext));
PRECONDITION(CheckPointer(pZapSigContext->pModuleContext));
PRECONDITION(CheckPointer(pZapSigContext->pInfoModule));
PRECONDITION(CheckPointer(handle));
PRECONDITION(CheckPointer(pSig));
}
CONTRACT_END
mdToken tk;
//
// pOrigModule is the original module that contained this ZapSig
//
ModuleBase * pOrigModule = pZapSigContext->pInfoModule;
CorElementType sigType = CorSigUncompressElementType(pSig);
CorElementType handleType = handle.GetSignatureCorElementType();
switch ((DWORD)sigType)
{
default:
{
// Unknown type!
_ASSERTE(!"Unknown type in ZapSig::CompareSignatureToTypeHandle");
RETURN(FALSE);
}
case ELEMENT_TYPE_MODULE_ZAPSIG:
{
DWORD ix = CorSigUncompressData(pSig);
CONTRACT_VIOLATION(ThrowsViolation|GCViolation);
pModule = pZapSigContext->GetZapSigModule()->GetModuleFromIndexIfLoaded(ix);
if (pModule == NULL)
RETURN FALSE;
else
RETURN(CompareSignatureToTypeHandle(pSig, pModule, handle, pZapSigContext));
}
case ELEMENT_TYPE_U:
case ELEMENT_TYPE_I:
case ELEMENT_TYPE_VOID:
case ELEMENT_TYPE_I1:
case ELEMENT_TYPE_U1:
case ELEMENT_TYPE_I2:
case ELEMENT_TYPE_U2:
case ELEMENT_TYPE_I4:
case ELEMENT_TYPE_U4:
case ELEMENT_TYPE_I8:
case ELEMENT_TYPE_U8:
case ELEMENT_TYPE_R4:
case ELEMENT_TYPE_R8:
case ELEMENT_TYPE_BOOLEAN:
case ELEMENT_TYPE_CHAR:
case ELEMENT_TYPE_TYPEDBYREF:
RETURN(sigType == handleType);
case ELEMENT_TYPE_STRING:
RETURN(handle == TypeHandle(g_pStringClass));
case ELEMENT_TYPE_OBJECT:
RETURN(handle == TypeHandle(g_pObjectClass));
case ELEMENT_TYPE_CANON_ZAPSIG:
RETURN(handle == TypeHandle(g_pCanonMethodTableClass));
case ELEMENT_TYPE_VAR:
case ELEMENT_TYPE_MVAR:
{
if (sigType != handleType)
RETURN(FALSE);
unsigned varNum = CorSigUncompressData(pSig);
RETURN(varNum == (dac_cast<PTR_TypeVarTypeDesc>(handle.AsTypeDesc())->GetIndex()));
}
case ELEMENT_TYPE_VAR_ZAPSIG:
{
if (!handle.IsGenericVariable())
RETURN(FALSE);
TypeVarTypeDesc *pTypeVarTypeDesc = handle.AsGenericVariable();
unsigned rid = CorSigUncompressData(pSig);
RETURN(TokenFromRid(rid, mdtGenericParam) == pTypeVarTypeDesc->GetToken() && pModule == pTypeVarTypeDesc->GetModule());
}
// These take an additional argument, which is the element type
case ELEMENT_TYPE_SZARRAY:
case ELEMENT_TYPE_PTR:
case ELEMENT_TYPE_BYREF:
{
if (sigType != handleType)
RETURN(FALSE);
RETURN (CompareSignatureToTypeHandle(pSig, pModule, handle.GetTypeParam(), pZapSigContext));
}
case ELEMENT_TYPE_NATIVE_VALUETYPE_ZAPSIG:
{
sigType = CorSigUncompressElementType(pSig);
_ASSERTE(sigType == ELEMENT_TYPE_VALUETYPE);
if (!handle.IsNativeValueType()) RETURN(FALSE);
FALLTHROUGH;
} // fall-through
case ELEMENT_TYPE_VALUETYPE:
case ELEMENT_TYPE_CLASS:
{
CorSigUncompressToken(pSig, &tk);
if (TypeFromToken(tk) == mdtTypeRef)
{
BOOL resolved = FALSE;
EX_TRY
{
ENABLE_FORBID_GC_LOADER_USE_IN_THIS_SCOPE();
Module *pTypeDefModule = nullptr;
resolved = ClassLoader::ResolveTokenToTypeDefThrowing(pModule, tk, &pTypeDefModule, &tk, Loader::DontLoad);
pModule = pTypeDefModule;
}
EX_CATCH
{
}
EX_END_CATCH(SwallowAllExceptions);
if (!resolved)
RETURN(FALSE);
}
_ASSERTE(TypeFromToken(tk) == mdtTypeDef);
RETURN (sigType == handleType && !handle.HasInstantiation() && pModule == handle.GetModule() && handle.GetCl() == tk);
}
case ELEMENT_TYPE_FNPTR:
{
if (sigType != handleType)
RETURN(FALSE);
FnPtrTypeDesc *pTD = handle.AsFnPtrType();
DWORD callConv = CorSigUncompressData(pSig);
if (callConv != pTD->GetCallConv())
RETURN(FALSE);
DWORD numArgs = CorSigUncompressData(pSig);
if (numArgs != pTD->GetNumArgs())
RETURN(FALSE);
{
CONTRACT_VIOLATION(ThrowsViolation|GCViolation);
for (DWORD i = 0; i <= numArgs; i++)
{
SigPointer sp(pSig);
if (!CompareSignatureToTypeHandle(pSig, pOrigModule, pTD->GetRetAndArgTypes()[i], pZapSigContext))
RETURN(FALSE);
if (FAILED(sp.SkipExactlyOne()))
{
RETURN(FALSE);
}
pSig = sp.GetPtr();
}
}
break;
}
case ELEMENT_TYPE_GENERICINST:
{
if (!handle.HasInstantiation())
RETURN(FALSE);
sigType = CorSigUncompressElementType(pSig);
if (sigType != handleType)
RETURN(FALSE);
pSig += CorSigUncompressToken(pSig, &tk);
if (TypeFromToken(tk) == mdtTypeRef)
{
BOOL resolved = FALSE;
EX_TRY
{
ENABLE_FORBID_GC_LOADER_USE_IN_THIS_SCOPE();
Module *pTypeDefModule = NULL;
resolved = ClassLoader::ResolveTokenToTypeDefThrowing(pModule, tk, &pTypeDefModule, &tk, Loader::DontLoad);
pModule = pTypeDefModule;
}
EX_CATCH
{
}
EX_END_CATCH(SwallowAllExceptions);
if (!resolved)
RETURN(FALSE);
}
_ASSERTE(TypeFromToken(tk) == mdtTypeDef);
if (pModule != handle.GetModule() || tk != handle.GetCl())
RETURN(FALSE);
DWORD numGenericArgs = CorSigUncompressData(pSig);
if (numGenericArgs != handle.GetNumGenericArgs())
RETURN(FALSE);
Instantiation inst = handle.GetInstantiation();
for (DWORD i = 0; i < inst.GetNumArgs(); i++)
{
SigPointer sp(pSig);
if (!CompareSignatureToTypeHandle(pSig, pOrigModule, inst[i], pZapSigContext))
RETURN(FALSE);
if (FAILED(sp.SkipExactlyOne()))
{
RETURN(FALSE);
}
pSig = sp.GetPtr();
}
break;
}
case ELEMENT_TYPE_ARRAY:
{
if (sigType != handleType)
RETURN(FALSE);
if (!CompareSignatureToTypeHandle(pSig, pModule, handle.GetArrayElementTypeHandle(), pZapSigContext))
RETURN(FALSE);
SigPointer sp(pSig);
if (FAILED(sp.SkipExactlyOne()))
RETURN(FALSE);
uint32_t rank;
if (FAILED(sp.GetData(&rank)))
RETURN(FALSE);
if (rank != handle.GetRank())
RETURN(FALSE);
break;
}
}
RETURN(TRUE);
}
/*static*/
BOOL ZapSig::CompareTypeHandleFieldToTypeHandle(TypeHandle *pTypeHnd, TypeHandle typeHnd2)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
MODE_ANY;
FORBID_FAULT;
PRECONDITION(CheckPointer(pTypeHnd));
PRECONDITION(CheckPointer(typeHnd2));
}
CONTRACTL_END
// Ensure that the compiler won't fetch the value twice
SIZE_T fixup = VolatileLoadWithoutBarrier((SIZE_T *)pTypeHnd);
return TypeHandle::FromTAddr(fixup) == typeHnd2;
}
#ifndef DACCESS_COMPILE
ModuleBase *ZapSig::DecodeModuleFromIndex(Module *fromModule,
DWORD index)
{
CONTRACTL
{
THROWS;
GC_TRIGGERS;
MODE_ANY;
}
CONTRACTL_END;
Assembly *pAssembly = NULL;
NativeImage *nativeImage = fromModule->GetCompositeNativeImage();
uint32_t assemblyRefMax = (nativeImage != NULL ? 0 : fromModule->GetAssemblyRefMax());
if (index <= assemblyRefMax)
{
if (index == 0)
{
pAssembly = fromModule->GetAssembly();
}
else
{
pAssembly = fromModule->LoadAssembly(RidToToken(index, mdtAssemblyRef));
}
}
else
{
index -= assemblyRefMax;
if (fromModule->GetReadyToRunInfo()->IsImageVersionAtLeast(6,3))
{
if (index == 1)
{
return fromModule->GetReadyToRunInfo()->GetNativeManifestModule();
}
index--;
}
pAssembly = fromModule->GetNativeMetadataAssemblyRefFromCache(index);
if(pAssembly == NULL)
{
Assembly *pParentAssembly = fromModule->GetAssembly();
if (nativeImage != NULL)
{
pAssembly = nativeImage->LoadManifestAssembly(index, pParentAssembly);
}
else
{
AssemblySpec spec;
spec.InitializeSpec(TokenFromRid(index, mdtAssemblyRef),
fromModule->GetNativeAssemblyImport(),
pParentAssembly);
pAssembly = spec.LoadAssembly(FILE_LOADED);
}
fromModule->SetNativeMetadataAssemblyRefInCache(index, pAssembly);
}
}
return pAssembly->GetModule();
}
ModuleBase *ZapSig::DecodeModuleFromIndexIfLoaded(Module *fromModule,
DWORD index)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
FORBID_FAULT;
}
CONTRACTL_END;
Assembly *pAssembly = NULL;
mdAssemblyRef tkAssemblyRef;
NativeImage *nativeImage = fromModule->GetCompositeNativeImage();
uint32_t assemblyRefMax = (nativeImage != NULL ? 0 : fromModule->GetAssemblyRefMax());
if (index <= assemblyRefMax)
{
if (index == 0)
{
pAssembly = fromModule->GetAssembly();
}
else
{
pAssembly = fromModule->GetAssemblyIfLoaded(RidToToken(index, mdtAssemblyRef));
}
}
else
{
index -= assemblyRefMax;
if (fromModule->GetReadyToRunInfo()->IsImageVersionAtLeast(6,3))
{
if (index == 1)
{
return fromModule->GetReadyToRunInfo()->GetNativeManifestModule();
}
index--;
}
pAssembly = fromModule->GetNativeMetadataAssemblyRefFromCache(index);
if (pAssembly == NULL)
{
tkAssemblyRef = RidToToken(index, mdtAssemblyRef);
IMDInternalImport * pMDImportOverride = (nativeImage != NULL
? nativeImage->GetManifestMetadata() : fromModule->GetNativeAssemblyImport(FALSE));
if (pMDImportOverride != NULL)
{
BOOL fValidAssemblyRef = TRUE;
LPCSTR pAssemblyName;
DWORD dwFlags;
if (FAILED(pMDImportOverride->GetAssemblyRefProps(tkAssemblyRef,
NULL,
NULL,
&pAssemblyName,
NULL,
NULL,
NULL,
&dwFlags)))
{ // Unexpected failure reading MetaData
fValidAssemblyRef = FALSE;
}
if (fValidAssemblyRef)
{
pAssembly = fromModule->GetAssemblyIfLoaded(
tkAssemblyRef,
pMDImportOverride);
}
}
}
}
if (pAssembly == NULL)
return NULL;
return pAssembly->GetModule();
}
TypeHandle ZapSig::DecodeType(Module *pEncodeModuleContext,
ModuleBase *pInfoModule,
PCCOR_SIGNATURE pBuffer,
ClassLoadLevel level,
PCCOR_SIGNATURE *ppAfterSig /*=NULL*/)
{
CONTRACTL
{
THROWS;
GC_TRIGGERS;
MODE_ANY;
}
CONTRACTL_END;
SigPointer p(pBuffer);
ZapSig::Context zapSigContext(pInfoModule, pEncodeModuleContext);
ZapSig::Context * pZapSigContext = &zapSigContext;
SigTypeContext typeContext; // empty context is OK: encoding should not contain type variables.
TypeHandle th = p.GetTypeHandleThrowing(pInfoModule,
&typeContext,
ClassLoader::LoadTypes,
level,
level < CLASS_LOADED, // For non-full loads, drop a level when loading generic arguments
NULL,
pZapSigContext);
if (ppAfterSig != NULL)
{
IfFailThrow(p.SkipExactlyOne());
*ppAfterSig = p.GetPtr();
}
return th;
}
MethodDesc *ZapSig::DecodeMethod(Module *pReferencingModule,
ModuleBase *pInfoModule,
PCCOR_SIGNATURE pBuffer,
TypeHandle * ppTH /*=NULL*/)
{
STANDARD_VM_CONTRACT;
SigTypeContext typeContext; // empty context is OK: encoding should not contain type variables.
ZapSig::Context zapSigContext(pInfoModule, (void *)pReferencingModule, ZapSig::NormalTokens);
return DecodeMethod(pInfoModule, pBuffer, &typeContext, &zapSigContext, ppTH, NULL, NULL);
}
MethodDesc *ZapSig::DecodeMethod(ModuleBase *pInfoModule,
PCCOR_SIGNATURE pBuffer,
SigTypeContext *pContext,
ZapSig::Context *pZapSigContext,
TypeHandle *ppTH, /*=NULL*/
PCCOR_SIGNATURE *ppOwnerTypeSpecWithVars, /*=NULL*/
PCCOR_SIGNATURE *ppMethodSpecWithVars, /*=NULL*/
PCCOR_SIGNATURE *ppAfterSig /*=NULL*/,
BOOL actualOwnerRequired /*=FALSE*/)
{
STANDARD_VM_CONTRACT;
MethodDesc *pMethod = NULL;
ModuleBase *pOrigModule = pInfoModule;
SigPointer sig(pBuffer);
// decode flags
uint32_t methodFlags;
IfFailThrow(sig.GetData(&methodFlags));
TypeHandle thOwner = NULL;
if ( methodFlags & ENCODE_METHOD_SIG_UpdateContext)
{
uint32_t updatedModuleIndex;
IfFailThrow(sig.GetData(&updatedModuleIndex));
#ifdef FEATURE_MULTICOREJIT
if (pZapSigContext->externalTokens == ZapSig::MulticoreJitTokens)
{
pInfoModule = MulticoreJitManager::DecodeModuleFromIndex(pZapSigContext->pModuleContext, updatedModuleIndex);
}
else
#endif
{
pInfoModule = pZapSigContext->GetZapSigModule()->GetModuleFromIndex(updatedModuleIndex);
}
}
if ( methodFlags & ENCODE_METHOD_SIG_OwnerType )
{
if (ppOwnerTypeSpecWithVars != NULL)
*ppOwnerTypeSpecWithVars = sig.GetPtr();
thOwner = sig.GetTypeHandleThrowing(pInfoModule,
pContext,
ClassLoader::LoadTypes,
CLASS_LOADED,
FALSE,
NULL,
pZapSigContext);
IfFailThrow(sig.SkipExactlyOne());
}
if ( methodFlags & ENCODE_METHOD_SIG_SlotInsteadOfToken )
{
// get the method desc using slot number
uint32_t slot;
IfFailThrow(sig.GetData(&slot));
_ASSERTE(!thOwner.IsNull());
pMethod = thOwner.GetMethodTable()->GetMethodDescForSlot(slot);
}
else
{
//
// decode method token
//
RID rid;
IfFailThrow(sig.GetData(&rid));
if (methodFlags & ENCODE_METHOD_SIG_MemberRefToken)
{
if (thOwner.IsNull())
{
TypeHandle th;
MethodDesc * pMD = NULL;
FieldDesc * pFD = NULL;
MemberLoader::GetDescFromMemberRef(pInfoModule, TokenFromRid(rid, mdtMemberRef), &pMD, &pFD, NULL, actualOwnerRequired, &th);
_ASSERTE(pMD != NULL);
thOwner = th;
pMethod = pMD;
}
else
{
pMethod = MemberLoader::GetMethodDescFromMemberRefAndType(pInfoModule, TokenFromRid(rid, mdtMemberRef), thOwner.GetMethodTable());
}
}
else
{
if (pInfoModule->IsFullModule())
{
pMethod = MemberLoader::GetMethodDescFromMethodDef(static_cast<Module*>(pInfoModule), TokenFromRid(rid, mdtMethodDef), FALSE);
}
else
{
// Non-full modules cannot have MethodDefs
ThrowHR(COR_E_BADIMAGEFORMAT);
}
}
}
if (thOwner.IsNull())
{
if (pZapSigContext->externalTokens == ZapSig::MulticoreJitTokens)
{
if (ppAfterSig != NULL)
*ppAfterSig = sig.GetPtr();
return NULL;
}
thOwner = pMethod->GetMethodTable();
}
if (ppTH != NULL)
*ppTH = thOwner;
// Ensure that the methoddescs dependencies have been walked sufficiently for type forwarders to be resolved.
// This method is actually basically a nop for dependencies which are ngen'd, but is real work for jitted
// dependencies. (However, this shouldn't be meaningful work that wouldn't happen in any case very soon.)
pMethod->PrepareForUseAsADependencyOfANativeImage();
Instantiation inst;
// Instantiate the method if needed, or create a stub to a static method in a generic class.
if (methodFlags & ENCODE_METHOD_SIG_MethodInstantiation)
{
if (ppMethodSpecWithVars != NULL)
*ppMethodSpecWithVars = sig.GetPtr();
uint32_t nargs;
IfFailThrow(sig.GetData(&nargs));
_ASSERTE(nargs > 0);
SIZE_T cbMem;
if (!ClrSafeInt<SIZE_T>::multiply(nargs, sizeof(TypeHandle), cbMem/* passed by ref */))
ThrowHR(COR_E_OVERFLOW);
TypeHandle * pInst = (TypeHandle*) _alloca(cbMem);
for (uint32_t i = 0; i < nargs; i++)
{
pInst[i] = sig.GetTypeHandleThrowing(pOrigModule,
pContext,
ClassLoader::LoadTypes,
CLASS_LOADED,
FALSE,
NULL,
pZapSigContext);
IfFailThrow(sig.SkipExactlyOne());
}
inst = Instantiation(pInst, nargs);
}
else
{
inst = pMethod->GetMethodInstantiation();
}
// This must be called even if nargs == 0, in order to create an instantiating
// stub for static methods in generic classees if needed, also for BoxedEntryPointStubs
// in non-generic structs.
BOOL isInstantiatingStub = (methodFlags & ENCODE_METHOD_SIG_InstantiatingStub);
BOOL isUnboxingStub = (methodFlags & ENCODE_METHOD_SIG_UnboxingStub);
pMethod = MethodDesc::FindOrCreateAssociatedMethodDesc(pMethod, thOwner.GetMethodTable(),
isUnboxingStub,
inst,
!(isInstantiatingStub || isUnboxingStub) && !actualOwnerRequired,
actualOwnerRequired);
if (methodFlags & ENCODE_METHOD_SIG_Constrained)
{
TypeHandle constrainedType = sig.GetTypeHandleThrowing(pInfoModule,
pContext,
ClassLoader::LoadTypes,
CLASS_LOADED,
FALSE,
NULL,
pZapSigContext);
if (ppAfterSig != NULL)
IfFailThrow(sig.SkipExactlyOne());
MethodDesc * directMethod = constrainedType.GetMethodTable()->TryResolveConstraintMethodApprox(thOwner.GetMethodTable(), pMethod);
if (directMethod == NULL)
{
// Method on value type was removed. Boxing stub would need to be generated to handle this case.
_ASSERTE(!"Constrained method resolution failed");
MemberLoader::ThrowMissingMethodException(constrainedType.GetMethodTable(), NULL, NULL, NULL, 0, NULL);
}
// Strip the instantiating stub if the signature did not ask for one
if (directMethod->IsInstantiatingStub() && !isInstantiatingStub)
{
pMethod = directMethod->GetWrappedMethodDesc();
}
else
{
pMethod = directMethod;
}
}
if (ppAfterSig != NULL)
*ppAfterSig = sig.GetPtr();
return pMethod;
}
FieldDesc * ZapSig::DecodeField(Module *pReferencingModule,
ModuleBase *pInfoModule,
PCCOR_SIGNATURE pBuffer,
TypeHandle *ppTH /*=NULL*/)
{
CONTRACTL
{
THROWS;
GC_TRIGGERS;
MODE_ANY;
}
CONTRACTL_END;
SigTypeContext typeContext; // empty context is OK: encoding should not contain type variables.
return DecodeField(pReferencingModule, pInfoModule, pBuffer, &typeContext, ppTH);
}
FieldDesc * ZapSig::DecodeField(Module *pReferencingModule,
ModuleBase *pInfoModule,
PCCOR_SIGNATURE pBuffer,
SigTypeContext *pContext,
TypeHandle *ppTH /*=NULL*/)
{
CONTRACTL
{
THROWS;
GC_TRIGGERS;
MODE_ANY;
}
CONTRACTL_END;