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arraynative.cpp
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arraynative.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.
// See the LICENSE file in the project root for more information.
//
// File: ArrayNative.cpp
//
//
// This file contains the native methods that support the Array class
//
#include "common.h"
#include "arraynative.h"
#include "excep.h"
#include "field.h"
#include "invokeutil.h"
#include "arraynative.inl"
// Returns a bool to indicate if the array is of primitive types or not.
FCIMPL1(INT32, ArrayNative::GetCorElementTypeOfElementType, ArrayBase* arrayUNSAFE)
{
FCALL_CONTRACT;
_ASSERTE(arrayUNSAFE != NULL);
return arrayUNSAFE->GetArrayElementTypeHandle().GetVerifierCorElementType();
}
FCIMPLEND
FCIMPL2(FC_BOOL_RET, ArrayNative::IsValueOfElementType, ArrayBase* arrayUNSAFE, Object* valueUNSAFE)
{
_ASSERTE(arrayUNSAFE != NULL);
_ASSERTE(valueUNSAFE != NULL);
FC_RETURN_BOOL(arrayUNSAFE->GetArrayElementTypeHandle() == valueUNSAFE->GetTypeHandle());
}
FCIMPLEND
// array is GC protected by caller
void ArrayInitializeWorker(ARRAYBASEREF * arrayRef,
MethodTable* pArrayMT,
MethodTable* pElemMT)
{
STATIC_CONTRACT_MODE_COOPERATIVE;
// Ensure that the array element type is fully loaded before executing its code
pElemMT->EnsureInstanceActive();
//can not use contract here because of SEH
_ASSERTE(IsProtectedByGCFrame (arrayRef));
SIZE_T offset = ArrayBase::GetDataPtrOffset(pArrayMT);
SIZE_T size = pArrayMT->GetComponentSize();
SIZE_T cElements = (*arrayRef)->GetNumComponents();
MethodTable * pCanonMT = pElemMT->GetCanonicalMethodTable();
WORD slot = pCanonMT->GetDefaultConstructorSlot();
PCODE ctorFtn = pCanonMT->GetSlot(slot);
#if defined(_TARGET_X86_) && !defined(FEATURE_PAL)
BEGIN_CALL_TO_MANAGED();
for (SIZE_T i = 0; i < cElements; i++)
{
// Since GetSlot() is not idempotent and may have returned
// a non-optimal entry-point the first time round.
if (i == 1)
{
ctorFtn = pCanonMT->GetSlot(slot);
}
BYTE* thisPtr = (((BYTE*) OBJECTREFToObject (*arrayRef)) + offset);
#ifdef _DEBUG
__asm {
mov ECX, thisPtr
mov EDX, pElemMT // Instantiation argument if the type is generic
call [ctorFtn]
nop // Mark the fact that we can call managed code
}
#else // _DEBUG
typedef void (__fastcall * CtorFtnType)(BYTE*, BYTE*);
(*(CtorFtnType)ctorFtn)(thisPtr, (BYTE*)pElemMT);
#endif // _DEBUG
offset += size;
}
END_CALL_TO_MANAGED();
#else // _TARGET_X86_ && !FEATURE_PAL
//
// This is quite a bit slower, but it is portable.
//
for (SIZE_T i =0; i < cElements; i++)
{
// Since GetSlot() is not idempotent and may have returned
// a non-optimal entry-point the first time round.
if (i == 1)
{
ctorFtn = pCanonMT->GetSlot(slot);
}
BYTE* thisPtr = (((BYTE*) OBJECTREFToObject (*arrayRef)) + offset);
PREPARE_NONVIRTUAL_CALLSITE_USING_CODE(ctorFtn);
DECLARE_ARGHOLDER_ARRAY(args, 2);
args[ARGNUM_0] = PTR_TO_ARGHOLDER(thisPtr);
args[ARGNUM_1] = PTR_TO_ARGHOLDER(pElemMT); // Instantiation argument if the type is generic
CALL_MANAGED_METHOD_NORET(args);
offset += size;
}
#endif // !_TARGET_X86_ || FEATURE_PAL
}
FCIMPL1(void, ArrayNative::Initialize, ArrayBase* array)
{
FCALL_CONTRACT;
if (array == NULL)
{
FCThrowVoid(kNullReferenceException);
}
MethodTable* pArrayMT = array->GetMethodTable();
TypeHandle thElem = pArrayMT->GetArrayElementTypeHandle();
if (thElem.IsTypeDesc())
return;
MethodTable * pElemMT = thElem.AsMethodTable();
if (!pElemMT->HasDefaultConstructor() || !pElemMT->IsValueType())
return;
ARRAYBASEREF arrayRef (array);
HELPER_METHOD_FRAME_BEGIN_1(arrayRef);
ArrayInitializeWorker(&arrayRef, pArrayMT, pElemMT);
HELPER_METHOD_FRAME_END();
}
FCIMPLEND
// Returns whether you can directly copy an array of srcType into destType.
FCIMPL2(FC_BOOL_RET, ArrayNative::IsSimpleCopy, ArrayBase* pSrc, ArrayBase* pDst)
{
FCALL_CONTRACT;
_ASSERTE(pSrc != NULL);
_ASSERTE(pDst != NULL);
// This case is expected to be handled by the fast path
_ASSERTE(pSrc->GetMethodTable() != pDst->GetMethodTable());
TypeHandle srcTH = pSrc->GetMethodTable()->GetArrayElementTypeHandle();
TypeHandle destTH = pDst->GetMethodTable()->GetArrayElementTypeHandle();
if (srcTH == destTH) // This check kicks for different array kind or dimensions
FC_RETURN_BOOL(true);
if (srcTH.IsValueType())
{
// Value class boxing
if (!destTH.IsValueType())
FC_RETURN_BOOL(false);
const CorElementType srcElType = srcTH.GetVerifierCorElementType();
const CorElementType destElType = destTH.GetVerifierCorElementType();
_ASSERTE(srcElType < ELEMENT_TYPE_MAX);
_ASSERTE(destElType < ELEMENT_TYPE_MAX);
// Copying primitives from one type to another
if (CorTypeInfo::IsPrimitiveType_NoThrow(srcElType) && CorTypeInfo::IsPrimitiveType_NoThrow(destElType))
{
if (GetNormalizedIntegralArrayElementType(srcElType) == GetNormalizedIntegralArrayElementType(destElType))
FC_RETURN_BOOL(true);
}
}
else
{
// Value class unboxing
if (destTH.IsValueType())
FC_RETURN_BOOL(false);
}
TypeHandle::CastResult r = srcTH.CanCastToCached(destTH);
if (r != TypeHandle::MaybeCast)
{
FC_RETURN_BOOL(r);
}
struct
{
OBJECTREF src;
OBJECTREF dst;
} gc;
gc.src = ObjectToOBJECTREF(pSrc);
gc.dst = ObjectToOBJECTREF(pDst);
BOOL iRetVal = FALSE;
HELPER_METHOD_FRAME_BEGIN_RET_PROTECT(gc);
iRetVal = srcTH.CanCastTo(destTH);
HELPER_METHOD_FRAME_END();
FC_RETURN_BOOL(iRetVal);
}
FCIMPLEND
// Returns an enum saying whether you can copy an array of srcType into destType.
ArrayNative::AssignArrayEnum ArrayNative::CanAssignArrayType(const BASEARRAYREF pSrc, const BASEARRAYREF pDest)
{
CONTRACTL
{
THROWS;
GC_TRIGGERS;
MODE_COOPERATIVE;
PRECONDITION(pSrc != NULL);
PRECONDITION(pDest != NULL);
}
CONTRACTL_END;
// This first bit is a minor optimization: e.g. when copying byte[] to byte[]
// we do not need to call GetArrayElementTypeHandle().
MethodTable *pSrcMT = pSrc->GetMethodTable();
MethodTable *pDestMT = pDest->GetMethodTable();
_ASSERTE(pSrcMT != pDestMT); // Handled by fast path
TypeHandle srcTH = pSrcMT->GetArrayElementTypeHandle();
TypeHandle destTH = pDestMT->GetArrayElementTypeHandle();
_ASSERTE(srcTH != destTH); // Handled by fast path
// Value class boxing
if (srcTH.IsValueType() && !destTH.IsValueType())
{
if (srcTH.CanCastTo(destTH))
return AssignBoxValueClassOrPrimitive;
else
return AssignWrongType;
}
// Value class unboxing.
if (!srcTH.IsValueType() && destTH.IsValueType())
{
if (srcTH.CanCastTo(destTH))
return AssignUnboxValueClass;
else if (destTH.CanCastTo(srcTH)) // V extends IV. Copying from IV to V, or Object to V.
return AssignUnboxValueClass;
else
return AssignWrongType;
}
const CorElementType srcElType = srcTH.GetVerifierCorElementType();
const CorElementType destElType = destTH.GetVerifierCorElementType();
_ASSERTE(srcElType < ELEMENT_TYPE_MAX);
_ASSERTE(destElType < ELEMENT_TYPE_MAX);
// Copying primitives from one type to another
if (CorTypeInfo::IsPrimitiveType_NoThrow(srcElType) && CorTypeInfo::IsPrimitiveType_NoThrow(destElType))
{
_ASSERTE(srcElType != destElType); // Handled by fast path
if (InvokeUtil::CanPrimitiveWiden(destElType, srcElType))
return AssignPrimitiveWiden;
else
return AssignWrongType;
}
// dest Object extends src
_ASSERTE(!srcTH.CanCastTo(destTH)); // Handled by fast path
// src Object extends dest
if (destTH.CanCastTo(srcTH))
return AssignMustCast;
// class X extends/implements src and implements dest.
if (destTH.IsInterface() && srcElType != ELEMENT_TYPE_VALUETYPE)
return AssignMustCast;
// class X implements src and extends/implements dest
if (srcTH.IsInterface() && destElType != ELEMENT_TYPE_VALUETYPE)
return AssignMustCast;
return AssignWrongType;
}
// Casts and assigns each element of src array to the dest array type.
void ArrayNative::CastCheckEachElement(const BASEARRAYREF pSrcUnsafe, const unsigned int srcIndex, BASEARRAYREF pDestUnsafe, unsigned int destIndex, const unsigned int len)
{
CONTRACTL
{
THROWS;
GC_TRIGGERS;
MODE_COOPERATIVE;
PRECONDITION(pSrcUnsafe != NULL);
PRECONDITION(srcIndex >= 0);
PRECONDITION(pDestUnsafe != NULL);
PRECONDITION(len > 0);
}
CONTRACTL_END;
// pSrc is either a PTRARRAYREF or a multidimensional array.
TypeHandle destTH = pDestUnsafe->GetArrayElementTypeHandle();
struct _gc
{
OBJECTREF obj;
BASEARRAYREF pDest;
BASEARRAYREF pSrc;
} gc;
gc.obj = NULL;
gc.pDest = pDestUnsafe;
gc.pSrc = pSrcUnsafe;
GCPROTECT_BEGIN(gc);
for(unsigned int i=srcIndex; i<srcIndex + len; ++i)
{
gc.obj = ObjectToOBJECTREF(*((Object**) gc.pSrc->GetDataPtr() + i));
// Now that we have grabbed obj, we are no longer subject to races from another
// mutator thread.
if (gc.obj != NULL && !ObjIsInstanceOf(OBJECTREFToObject(gc.obj), destTH))
COMPlusThrow(kInvalidCastException, W("InvalidCast_DownCastArrayElement"));
OBJECTREF * destData = (OBJECTREF*)(gc.pDest->GetDataPtr()) + i - srcIndex + destIndex;
SetObjectReference(destData, gc.obj);
}
GCPROTECT_END();
return;
}
// Will box each element in an array of value classes or primitives into an array of Objects.
void ArrayNative::BoxEachElement(BASEARRAYREF pSrc, unsigned int srcIndex, BASEARRAYREF pDest, unsigned int destIndex, unsigned int length)
{
CONTRACTL
{
THROWS;
GC_TRIGGERS;
MODE_COOPERATIVE;
PRECONDITION(pSrc != NULL);
PRECONDITION(srcIndex >= 0);
PRECONDITION(pDest != NULL);
PRECONDITION(length > 0);
}
CONTRACTL_END;
// pDest is either a PTRARRAYREF or a multidimensional array.
_ASSERTE(pSrc!=NULL && srcIndex>=0 && pDest!=NULL && destIndex>=0 && length>=0);
TypeHandle srcTH = pSrc->GetArrayElementTypeHandle();
#ifdef _DEBUG
TypeHandle destTH = pDest->GetArrayElementTypeHandle();
#endif
_ASSERTE(srcTH.GetSignatureCorElementType() == ELEMENT_TYPE_CLASS || srcTH.GetSignatureCorElementType() == ELEMENT_TYPE_VALUETYPE || CorTypeInfo::IsPrimitiveType(pSrc->GetArrayElementType()));
_ASSERTE(!destTH.GetMethodTable()->IsValueType());
// Get method table of type we're copying from - we need to allocate objects of that type.
MethodTable * pSrcMT = srcTH.GetMethodTable();
PREFIX_ASSUME(pSrcMT != NULL);
if (!pSrcMT->IsClassInited())
{
BASEARRAYREF pSrcTmp = pSrc;
BASEARRAYREF pDestTmp = pDest;
GCPROTECT_BEGIN (pSrcTmp);
GCPROTECT_BEGIN (pDestTmp);
pSrcMT->CheckRunClassInitThrowing();
pSrc = pSrcTmp;
pDest = pDestTmp;
GCPROTECT_END ();
GCPROTECT_END ();
}
const unsigned int srcSize = pSrcMT->GetNumInstanceFieldBytes();
unsigned int srcArrayOffset = srcIndex * srcSize;
struct _gc
{
BASEARRAYREF src;
BASEARRAYREF dest;
OBJECTREF obj;
} gc;
gc.src = pSrc;
gc.dest = pDest;
gc.obj = NULL;
void* srcPtr = 0;
GCPROTECT_BEGIN(gc);
GCPROTECT_BEGININTERIOR(srcPtr);
for (unsigned int i=destIndex; i < destIndex+length; i++, srcArrayOffset += srcSize)
{
srcPtr = (BYTE*)gc.src->GetDataPtr() + srcArrayOffset;
gc.obj = pSrcMT->FastBox(&srcPtr);
OBJECTREF * destData = (OBJECTREF*)((gc.dest)->GetDataPtr()) + i;
SetObjectReference(destData, gc.obj);
}
GCPROTECT_END();
GCPROTECT_END();
}
// Unboxes from an Object[] into a value class or primitive array.
void ArrayNative::UnBoxEachElement(BASEARRAYREF pSrc, unsigned int srcIndex, BASEARRAYREF pDest, unsigned int destIndex, unsigned int length)
{
CONTRACTL
{
THROWS;
GC_TRIGGERS;
MODE_COOPERATIVE;
PRECONDITION(pSrc != NULL);
PRECONDITION(srcIndex >= 0);
PRECONDITION(pDest != NULL);
PRECONDITION(destIndex >= 0);
PRECONDITION(length > 0);
}
CONTRACTL_END;
#ifdef _DEBUG
TypeHandle srcTH = pSrc->GetArrayElementTypeHandle();
#endif
TypeHandle destTH = pDest->GetArrayElementTypeHandle();
_ASSERTE(destTH.GetSignatureCorElementType() == ELEMENT_TYPE_CLASS || destTH.GetSignatureCorElementType() == ELEMENT_TYPE_VALUETYPE || CorTypeInfo::IsPrimitiveType(pDest->GetArrayElementType()));
_ASSERTE(!srcTH.GetMethodTable()->IsValueType());
MethodTable * pDestMT = destTH.GetMethodTable();
PREFIX_ASSUME(pDestMT != NULL);
SIZE_T destSize = pDest->GetComponentSize();
BYTE* srcData = (BYTE*) pSrc->GetDataPtr() + srcIndex * sizeof(OBJECTREF);
BYTE* data = (BYTE*) pDest->GetDataPtr() + destIndex * destSize;
for(; length>0; length--, srcData += sizeof(OBJECTREF), data += destSize)
{
OBJECTREF obj = ObjectToOBJECTREF(*(Object**)srcData);
// Now that we have retrieved the element, we are no longer subject to race
// conditions from another array mutator.
if (!pDestMT->UnBoxInto(data, obj))
goto fail;
}
return;
fail:
COMPlusThrow(kInvalidCastException, W("InvalidCast_DownCastArrayElement"));
}
// Widen primitive types to another primitive type.
void ArrayNative::PrimitiveWiden(BASEARRAYREF pSrc, unsigned int srcIndex, BASEARRAYREF pDest, unsigned int destIndex, unsigned int length)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
MODE_COOPERATIVE;
PRECONDITION(pSrc != NULL);
PRECONDITION(srcIndex >= 0);
PRECONDITION(pDest != NULL);
PRECONDITION(destIndex >= 0);
PRECONDITION(length > 0);
}
CONTRACTL_END;
// Get appropriate sizes, which requires method tables.
TypeHandle srcTH = pSrc->GetArrayElementTypeHandle();
TypeHandle destTH = pDest->GetArrayElementTypeHandle();
const CorElementType srcElType = srcTH.GetVerifierCorElementType();
const CorElementType destElType = destTH.GetVerifierCorElementType();
const unsigned int srcSize = GetSizeForCorElementType(srcElType);
const unsigned int destSize = GetSizeForCorElementType(destElType);
BYTE* srcData = (BYTE*) pSrc->GetDataPtr() + srcIndex * srcSize;
BYTE* data = (BYTE*) pDest->GetDataPtr() + destIndex * destSize;
_ASSERTE(srcElType != destElType); // We shouldn't be here if these are the same type.
_ASSERTE(CorTypeInfo::IsPrimitiveType_NoThrow(srcElType) && CorTypeInfo::IsPrimitiveType_NoThrow(destElType));
for(; length>0; length--, srcData += srcSize, data += destSize)
{
// We pretty much have to do some fancy datatype mangling every time here, for
// converting w/ sign extension and floating point conversions.
switch (srcElType)
{
case ELEMENT_TYPE_U1:
switch (destElType)
{
case ELEMENT_TYPE_R4:
*(float*)data = *(UINT8*)srcData;
break;
case ELEMENT_TYPE_R8:
*(double*)data = *(UINT8*)srcData;
break;
#ifndef BIGENDIAN
default:
*(UINT8*)data = *(UINT8*)srcData;
memset(data+1, 0, destSize - 1);
break;
#else // BIGENDIAN
case ELEMENT_TYPE_CHAR:
case ELEMENT_TYPE_I2:
case ELEMENT_TYPE_U2:
*(INT16*)data = *(UINT8*)srcData;
break;
case ELEMENT_TYPE_I4:
case ELEMENT_TYPE_U4:
*(INT32*)data = *(UINT8*)srcData;
break;
case ELEMENT_TYPE_I8:
case ELEMENT_TYPE_U8:
*(INT64*)data = *(UINT8*)srcData;
break;
default:
_ASSERTE(!"Array.Copy from U1 to another type hit unsupported widening conversion");
#endif // BIGENDIAN
}
break;
case ELEMENT_TYPE_I1:
switch (destElType)
{
case ELEMENT_TYPE_I2:
*(INT16*)data = *(INT8*)srcData;
break;
case ELEMENT_TYPE_I4:
*(INT32*)data = *(INT8*)srcData;
break;
case ELEMENT_TYPE_I8:
*(INT64*)data = *(INT8*)srcData;
break;
case ELEMENT_TYPE_R4:
*(float*)data = *(INT8*)srcData;
break;
case ELEMENT_TYPE_R8:
*(double*)data = *(INT8*)srcData;
break;
default:
_ASSERTE(!"Array.Copy from I1 to another type hit unsupported widening conversion");
}
break;
case ELEMENT_TYPE_U2:
case ELEMENT_TYPE_CHAR:
switch (destElType)
{
case ELEMENT_TYPE_R4:
*(float*)data = *(UINT16*)srcData;
break;
case ELEMENT_TYPE_R8:
*(double*)data = *(UINT16*)srcData;
break;
#ifndef BIGENDIAN
default:
*(UINT16*)data = *(UINT16*)srcData;
memset(data+2, 0, destSize - 2);
break;
#else // BIGENDIAN
case ELEMENT_TYPE_U2:
case ELEMENT_TYPE_CHAR:
*(UINT16*)data = *(UINT16*)srcData;
break;
case ELEMENT_TYPE_I4:
case ELEMENT_TYPE_U4:
*(UINT32*)data = *(UINT16*)srcData;
break;
case ELEMENT_TYPE_I8:
case ELEMENT_TYPE_U8:
*(UINT64*)data = *(UINT16*)srcData;
break;
default:
_ASSERTE(!"Array.Copy from U1 to another type hit unsupported widening conversion");
#endif // BIGENDIAN
}
break;
case ELEMENT_TYPE_I2:
switch (destElType)
{
case ELEMENT_TYPE_I4:
*(INT32*)data = *(INT16*)srcData;
break;
case ELEMENT_TYPE_I8:
*(INT64*)data = *(INT16*)srcData;
break;
case ELEMENT_TYPE_R4:
*(float*)data = *(INT16*)srcData;
break;
case ELEMENT_TYPE_R8:
*(double*)data = *(INT16*)srcData;
break;
default:
_ASSERTE(!"Array.Copy from I2 to another type hit unsupported widening conversion");
}
break;
case ELEMENT_TYPE_I4:
switch (destElType)
{
case ELEMENT_TYPE_I8:
*(INT64*)data = *(INT32*)srcData;
break;
case ELEMENT_TYPE_R4:
*(float*)data = (float)*(INT32*)srcData;
break;
case ELEMENT_TYPE_R8:
*(double*)data = *(INT32*)srcData;
break;
default:
_ASSERTE(!"Array.Copy from I4 to another type hit unsupported widening conversion");
}
break;
case ELEMENT_TYPE_U4:
switch (destElType)
{
case ELEMENT_TYPE_I8:
case ELEMENT_TYPE_U8:
*(INT64*)data = *(UINT32*)srcData;
break;
case ELEMENT_TYPE_R4:
*(float*)data = (float)*(UINT32*)srcData;
break;
case ELEMENT_TYPE_R8:
*(double*)data = *(UINT32*)srcData;
break;
default:
_ASSERTE(!"Array.Copy from U4 to another type hit unsupported widening conversion");
}
break;
case ELEMENT_TYPE_I8:
if (destElType == ELEMENT_TYPE_R4)
{
*(float*) data = (float) *(INT64*)srcData;
}
else
{
_ASSERTE(destElType==ELEMENT_TYPE_R8);
*(double*) data = (double) *(INT64*)srcData;
}
break;
case ELEMENT_TYPE_U8:
if (destElType == ELEMENT_TYPE_R4)
{
//*(float*) data = (float) *(UINT64*)srcData;
INT64 srcVal = *(INT64*)srcData;
float f = (float) srcVal;
if (srcVal < 0)
f += 4294967296.0f * 4294967296.0f; // This is 2^64
*(float*) data = f;
}
else
{
_ASSERTE(destElType==ELEMENT_TYPE_R8);
//*(double*) data = (double) *(UINT64*)srcData;
INT64 srcVal = *(INT64*)srcData;
double d = (double) srcVal;
if (srcVal < 0)
d += 4294967296.0 * 4294967296.0; // This is 2^64
*(double*) data = d;
}
break;
case ELEMENT_TYPE_R4:
*(double*) data = *(float*)srcData;
break;
default:
_ASSERTE(!"Fell through outer switch in PrimitiveWiden! Unknown primitive type for source array!");
}
}
}
//
// This is a GC safe variant of the memmove intrinsic. It sets the cards, and guarantees that the object references in the GC heap are
// updated atomically.
//
// The CRT version of memmove does not always guarantee that updates of aligned fields stay atomic (e.g. it is using "rep movsb" in some cases).
// Type safety guarantees and background GC scanning requires object references in GC heap to be updated atomically.
//
void memmoveGCRefs(void *dest, const void *src, size_t len)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
MODE_COOPERATIVE;
}
CONTRACTL_END;
_ASSERTE(dest != nullptr);
_ASSERTE(src != nullptr);
// Make sure everything is pointer aligned
_ASSERTE(IS_ALIGNED(dest, sizeof(SIZE_T)));
_ASSERTE(IS_ALIGNED(src, sizeof(SIZE_T)));
_ASSERTE(IS_ALIGNED(len, sizeof(SIZE_T)));
_ASSERTE(CheckPointer(dest));
_ASSERTE(CheckPointer(src));
if (len != 0 && dest != src)
{
InlinedMemmoveGCRefsHelper(dest, src, len);
}
}
FCIMPL5(void, ArrayNative::CopySlow, ArrayBase* pSrc, INT32 iSrcIndex, ArrayBase* pDst, INT32 iDstIndex, INT32 iLength)
{
FCALL_CONTRACT;
struct _gc
{
BASEARRAYREF pSrc;
BASEARRAYREF pDst;
} gc;
gc.pSrc = (BASEARRAYREF)pSrc;
gc.pDst = (BASEARRAYREF)pDst;
// cannot pass null for source or destination
_ASSERTE(gc.pSrc != NULL && gc.pDst != NULL);
// source and destination must be arrays
_ASSERTE(gc.pSrc->GetMethodTable()->IsArray());
_ASSERTE(gc.pDst->GetMethodTable()->IsArray());
_ASSERTE(gc.pSrc->GetRank() == gc.pDst->GetRank());
// array bounds checking
_ASSERTE(iLength >= 0);
_ASSERTE(iSrcIndex >= 0);
_ASSERTE(iDstIndex >= 0);
_ASSERTE((DWORD)(iSrcIndex + iLength) <= gc.pSrc->GetNumComponents());
_ASSERTE((DWORD)(iDstIndex + iLength) <= gc.pDst->GetNumComponents());
HELPER_METHOD_FRAME_BEGIN_PROTECT(gc);
int r = CanAssignArrayType(gc.pSrc, gc.pDst);
if (r == AssignWrongType)
COMPlusThrow(kArrayTypeMismatchException, W("ArrayTypeMismatch_CantAssignType"));
if (iLength > 0)
{
switch (r)
{
case AssignUnboxValueClass:
UnBoxEachElement(gc.pSrc, iSrcIndex, gc.pDst, iDstIndex, iLength);
break;
case AssignBoxValueClassOrPrimitive:
BoxEachElement(gc.pSrc, iSrcIndex, gc.pDst, iDstIndex, iLength);
break;
case AssignMustCast:
CastCheckEachElement(gc.pSrc, iSrcIndex, gc.pDst, iDstIndex, iLength);
break;
case AssignPrimitiveWiden:
PrimitiveWiden(gc.pSrc, iSrcIndex, gc.pDst, iDstIndex, iLength);
break;
default:
_ASSERTE(!"Fell through switch in Array.Copy!");
}
}
HELPER_METHOD_FRAME_END();
}
FCIMPLEND
// Check we're allowed to create an array with the given element type.
void ArrayNative::CheckElementType(TypeHandle elementType)
{
// Check for simple types first.
if (!elementType.IsTypeDesc())
{
MethodTable *pMT = elementType.AsMethodTable();
// Check for byref-like types.
if (pMT->IsByRefLike())
COMPlusThrow(kNotSupportedException, W("NotSupported_ByRefLikeArray"));
// Check for open generic types.
if (pMT->IsGenericTypeDefinition() || pMT->ContainsGenericVariables())
COMPlusThrow(kNotSupportedException, W("NotSupported_OpenType"));
// Check for Void.
if (elementType.GetSignatureCorElementType() == ELEMENT_TYPE_VOID)
COMPlusThrow(kNotSupportedException, W("NotSupported_VoidArray"));
// That's all the dangerous simple types we know, it must be OK.
return;
}
// Checks apply recursively for arrays of arrays etc.
if (elementType.IsArray())
{
CheckElementType(elementType.GetElementType());
return;
}
// ByRefs and generic type variables are never allowed.
if (elementType.IsByRef() || elementType.IsGenericVariable())
COMPlusThrow(kNotSupportedException, W("NotSupported_Type"));
// We can create pointers and function pointers, but it requires skip verification permission.
CorElementType etType = elementType.GetSignatureCorElementType();
if (etType == ELEMENT_TYPE_PTR || etType == ELEMENT_TYPE_FNPTR)
{
return;
}
// We shouldn't get here (it means we've encountered a new type of typehandle if we do).
_ASSERTE(!"Shouldn't get here, unknown type handle type");
COMPlusThrow(kNotSupportedException);
}
FCIMPL4(Object*, ArrayNative::CreateInstance, void* elementTypeHandle, INT32 rank, INT32* pLengths, INT32* pLowerBounds)
{
CONTRACTL {
FCALL_CHECK;
PRECONDITION(rank > 0);
PRECONDITION(CheckPointer(pLengths));
PRECONDITION(CheckPointer(pLowerBounds, NULL_OK));
} CONTRACTL_END;
OBJECTREF pRet = NULL;
TypeHandle elementType = TypeHandle::FromPtr(elementTypeHandle);
_ASSERTE(!elementType.IsNull());
// pLengths and pLowerBounds are pinned buffers. No need to protect them.
HELPER_METHOD_FRAME_BEGIN_RET_0();
CheckElementType(elementType);
CorElementType CorType = elementType.GetSignatureCorElementType();
CorElementType kind = ELEMENT_TYPE_ARRAY;
// Is it ELEMENT_TYPE_SZARRAY array?
if (rank == 1 && (pLowerBounds == NULL || pLowerBounds[0] == 0)
#ifdef FEATURE_64BIT_ALIGNMENT
// On platforms where 64-bit types require 64-bit alignment and don't obtain it naturally force us
// through the slow path where this will be handled.
&& (CorType != ELEMENT_TYPE_I8)
&& (CorType != ELEMENT_TYPE_U8)
&& (CorType != ELEMENT_TYPE_R8)
#endif
)
{
// Shortcut for common cases
if (CorTypeInfo::IsPrimitiveType(CorType))
{
pRet = AllocatePrimitiveArray(CorType,pLengths[0]);
goto Done;
}
else
if (CorTypeInfo::IsObjRef(CorType))
{
pRet = AllocateObjectArray(pLengths[0],elementType);
goto Done;
}
kind = ELEMENT_TYPE_SZARRAY;
pLowerBounds = NULL;
}
{
// Find the Array class...
TypeHandle typeHnd = ClassLoader::LoadArrayTypeThrowing(elementType, kind, rank);
DWORD boundsSize = 0;
INT32* bounds;
if (pLowerBounds != NULL) {
if (!ClrSafeInt<DWORD>::multiply(rank, 2, boundsSize))
COMPlusThrowOM();
DWORD dwAllocaSize = 0;
if (!ClrSafeInt<DWORD>::multiply(boundsSize, sizeof(INT32), dwAllocaSize))
COMPlusThrowOM();
bounds = (INT32*) _alloca(dwAllocaSize);
for (int i=0;i<rank;i++) {
bounds[2*i] = pLowerBounds[i];
bounds[2*i+1] = pLengths[i];
}
}
else {
boundsSize = rank;
DWORD dwAllocaSize = 0;
if (!ClrSafeInt<DWORD>::multiply(boundsSize, sizeof(INT32), dwAllocaSize))
COMPlusThrowOM();
bounds = (INT32*) _alloca(dwAllocaSize);
// We need to create a private copy of pLengths to avoid holes caused
// by caller mutating the array
for (int i=0;i<rank;i++)
bounds[i] = pLengths[i];
}
pRet = AllocateArrayEx(typeHnd, bounds, boundsSize);
}
Done: ;
HELPER_METHOD_FRAME_END();
return OBJECTREFToObject(pRet);
}
FCIMPLEND
FCIMPL4(void, ArrayNative::GetReference, ArrayBase* refThisUNSAFE, TypedByRef* elemRef, INT32 rank, INT32* pIndices)
{
CONTRACTL {
FCALL_CHECK;
PRECONDITION(rank >= 0);
} CONTRACTL_END;
// FC_GC_POLL not necessary. We poll for GC in Array.Rank that's always called
// right before this function
FC_GC_POLL_NOT_NEEDED();
BASEARRAYREF refThis = (BASEARRAYREF) refThisUNSAFE;
_ASSERTE(rank == (INT32)refThis->GetRank());
SIZE_T Offset = 0;
const INT32 *pBoundsPtr = refThis->GetBoundsPtr();
if (rank == 1)
{
Offset = pIndices[0] - refThis->GetLowerBoundsPtr()[0];
// Bounds check each index
// Casting to unsigned allows us to use one compare for [0..limit-1]
if (((UINT32) Offset) >= ((UINT32) pBoundsPtr[0]))
FCThrowVoid(kIndexOutOfRangeException);
}
else
{
// Avoid redundant computation in GetLowerBoundsPtr
const INT32 *pLowerBoundsPtr = pBoundsPtr + rank;
_ASSERTE(refThis->GetLowerBoundsPtr() == pLowerBoundsPtr);