//===-- runtime/assign.cpp ------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "flang/Runtime/assign.h"
#include "assign-impl.h"
#include "derived.h"
#include "stat.h"
#include "terminator.h"
#include "tools.h"
#include "type-info.h"
#include "flang/Runtime/descriptor.h"
namespace Fortran::runtime {
enum AssignFlags {
NoAssignFlags = 0,
MaybeReallocate = 1 << 0,
NeedFinalization = 1 << 1,
CanBeDefinedAssignment = 1 << 2,
ComponentCanBeDefinedAssignment = 1 << 3,
ExplicitLengthCharacterLHS = 1 << 4,
PolymorphicLHS = 1 << 5,
DeallocateLHS = 1 << 6
};
// Predicate: is the left-hand side of an assignment an allocated allocatable
// that must be deallocated?
static inline RT_API_ATTRS bool MustDeallocateLHS(
Descriptor &to, const Descriptor &from, Terminator &terminator, int flags) {
// Top-level assignments to allocatable variables (*not* components)
// may first deallocate existing content if there's about to be a
// change in type or shape; see F'2018 10.2.1.3(3).
if (!(flags & MaybeReallocate)) {
return false;
}
if (!to.IsAllocatable() || !to.IsAllocated()) {
return false;
}
if (to.type() != from.type()) {
return true;
}
if (!(flags & ExplicitLengthCharacterLHS) && to.type().IsCharacter() &&
to.ElementBytes() != from.ElementBytes()) {
return true;
}
if (flags & PolymorphicLHS) {
DescriptorAddendum *toAddendum{to.Addendum()};
const typeInfo::DerivedType *toDerived{
toAddendum ? toAddendum->derivedType() : nullptr};
const DescriptorAddendum *fromAddendum{from.Addendum()};
const typeInfo::DerivedType *fromDerived{
fromAddendum ? fromAddendum->derivedType() : nullptr};
if (toDerived != fromDerived) {
return true;
}
if (fromDerived) {
// Distinct LEN parameters? Deallocate
std::size_t lenParms{fromDerived->LenParameters()};
for (std::size_t j{0}; j < lenParms; ++j) {
if (toAddendum->LenParameterValue(j) !=
fromAddendum->LenParameterValue(j)) {
return true;
}
}
}
}
if (from.rank() > 0) {
// Distinct shape? Deallocate
int rank{to.rank()};
for (int j{0}; j < rank; ++j) {
if (to.GetDimension(j).Extent() != from.GetDimension(j).Extent()) {
return true;
}
}
}
return false;
}
// Utility: allocate the allocatable left-hand side, either because it was
// originally deallocated or because it required reallocation
static RT_API_ATTRS int AllocateAssignmentLHS(
Descriptor &to, const Descriptor &from, Terminator &terminator, int flags) {
to.raw().type = from.raw().type;
if (!(flags & ExplicitLengthCharacterLHS)) {
to.raw().elem_len = from.ElementBytes();
}
const typeInfo::DerivedType *derived{nullptr};
if (const DescriptorAddendum * fromAddendum{from.Addendum()}) {
derived = fromAddendum->derivedType();
if (DescriptorAddendum * toAddendum{to.Addendum()}) {
toAddendum->set_derivedType(derived);
std::size_t lenParms{derived ? derived->LenParameters() : 0};
for (std::size_t j{0}; j < lenParms; ++j) {
toAddendum->SetLenParameterValue(j, fromAddendum->LenParameterValue(j));
}
}
}
// subtle: leave bounds in place when "from" is scalar (10.2.1.3(3))
int rank{from.rank()};
auto stride{static_cast<SubscriptValue>(to.ElementBytes())};
for (int j{0}; j < rank; ++j) {
auto &toDim{to.GetDimension(j)};
const auto &fromDim{from.GetDimension(j)};
toDim.SetBounds(fromDim.LowerBound(), fromDim.UpperBound());
toDim.SetByteStride(stride);
stride *= toDim.Extent();
}
int result{ReturnError(terminator, to.Allocate())};
if (result == StatOk && derived && !derived->noInitializationNeeded()) {
result = ReturnError(terminator, Initialize(to, *derived, terminator));
}
return result;
}
// least <= 0, most >= 0
static RT_API_ATTRS void MaximalByteOffsetRange(
const Descriptor &desc, std::int64_t &least, std::int64_t &most) {
least = most = 0;
if (desc.ElementBytes() == 0) {
return;
}
int n{desc.raw().rank};
for (int j{0}; j < n; ++j) {
const auto &dim{desc.GetDimension(j)};
auto extent{dim.Extent()};
if (extent > 0) {
auto sm{dim.ByteStride()};
if (sm < 0) {
least += (extent - 1) * sm;
} else {
most += (extent - 1) * sm;
}
}
}
most += desc.ElementBytes() - 1;
}
static inline RT_API_ATTRS bool RangesOverlap(const char *aStart,
const char *aEnd, const char *bStart, const char *bEnd) {
return aEnd >= bStart && bEnd >= aStart;
}
// Predicate: could the left-hand and right-hand sides of the assignment
// possibly overlap in memory? Note that the descriptors themeselves
// are included in the test.
static RT_API_ATTRS bool MayAlias(const Descriptor &x, const Descriptor &y) {
const char *xBase{x.OffsetElement()};
const char *yBase{y.OffsetElement()};
if (!xBase || !yBase) {
return false; // not both allocated
}
const char *xDesc{reinterpret_cast<const char *>(&x)};
const char *xDescLast{xDesc + x.SizeInBytes()};
const char *yDesc{reinterpret_cast<const char *>(&y)};
const char *yDescLast{yDesc + y.SizeInBytes()};
std::int64_t xLeast, xMost, yLeast, yMost;
MaximalByteOffsetRange(x, xLeast, xMost);
MaximalByteOffsetRange(y, yLeast, yMost);
if (RangesOverlap(xDesc, xDescLast, yBase + yLeast, yBase + yMost) ||
RangesOverlap(yDesc, yDescLast, xBase + xLeast, xBase + xMost)) {
// A descriptor overlaps with the storage described by the other;
// this can arise when an allocatable or pointer component is
// being assigned to/from.
return true;
}
if (!RangesOverlap(
xBase + xLeast, xBase + xMost, yBase + yLeast, yBase + yMost)) {
return false; // no storage overlap
}
// TODO: check dimensions: if any is independent, return false
return true;
}
static RT_API_ATTRS void DoScalarDefinedAssignment(const Descriptor &to,
const Descriptor &from, const typeInfo::SpecialBinding &special) {
bool toIsDesc{special.IsArgDescriptor(0)};
bool fromIsDesc{special.IsArgDescriptor(1)};
if (toIsDesc) {
if (fromIsDesc) {
auto *p{
special.GetProc<void (*)(const Descriptor &, const Descriptor &)>()};
p(to, from);
} else {
auto *p{special.GetProc<void (*)(const Descriptor &, void *)>()};
p(to, from.raw().base_addr);
}
} else {
if (fromIsDesc) {
auto *p{special.GetProc<void (*)(void *, const Descriptor &)>()};
p(to.raw().base_addr, from);
} else {
auto *p{special.GetProc<void (*)(void *, void *)>()};
p(to.raw().base_addr, from.raw().base_addr);
}
}
}
static RT_API_ATTRS void DoElementalDefinedAssignment(const Descriptor &to,
const Descriptor &from, const typeInfo::DerivedType &derived,
const typeInfo::SpecialBinding &special) {
SubscriptValue toAt[maxRank], fromAt[maxRank];
to.GetLowerBounds(toAt);
from.GetLowerBounds(fromAt);
StaticDescriptor<maxRank, true, 8 /*?*/> statDesc[2];
Descriptor &toElementDesc{statDesc[0].descriptor()};
Descriptor &fromElementDesc{statDesc[1].descriptor()};
toElementDesc.Establish(derived, nullptr, 0, nullptr, CFI_attribute_pointer);
fromElementDesc.Establish(
derived, nullptr, 0, nullptr, CFI_attribute_pointer);
for (std::size_t toElements{to.Elements()}; toElements-- > 0;
to.IncrementSubscripts(toAt), from.IncrementSubscripts(fromAt)) {
toElementDesc.set_base_addr(to.Element<char>(toAt));
fromElementDesc.set_base_addr(from.Element<char>(fromAt));
DoScalarDefinedAssignment(toElementDesc, fromElementDesc, special);
}
}
template <typename CHAR>
static RT_API_ATTRS void BlankPadCharacterAssignment(Descriptor &to,
const Descriptor &from, SubscriptValue toAt[], SubscriptValue fromAt[],
std::size_t elements, std::size_t toElementBytes,
std::size_t fromElementBytes) {
std::size_t padding{(toElementBytes - fromElementBytes) / sizeof(CHAR)};
std::size_t copiedCharacters{fromElementBytes / sizeof(CHAR)};
for (; elements-- > 0;
to.IncrementSubscripts(toAt), from.IncrementSubscripts(fromAt)) {
CHAR *p{to.Element<CHAR>(toAt)};
Fortran::runtime::memmove(
p, from.Element<std::add_const_t<CHAR>>(fromAt), fromElementBytes);
p += copiedCharacters;
for (auto n{padding}; n-- > 0;) {
*p++ = CHAR{' '};
}
}
}
// Common implementation of assignments, both intrinsic assignments and
// those cases of polymorphic user-defined ASSIGNMENT(=) TBPs that could not
// be resolved in semantics. Most assignment statements do not need any
// of the capabilities of this function -- but when the LHS is allocatable,
// the type might have a user-defined ASSIGNMENT(=), or the type might be
// finalizable, this function should be used.
// When "to" is not a whole allocatable, "from" is an array, and defined
// assignments are not used, "to" and "from" only need to have the same number
// of elements, but their shape need not to conform (the assignment is done in
// element sequence order). This facilitates some internal usages, like when
// dealing with array constructors.
RT_API_ATTRS static void Assign(
Descriptor &to, const Descriptor &from, Terminator &terminator, int flags) {
bool mustDeallocateLHS{(flags & DeallocateLHS) ||
MustDeallocateLHS(to, from, terminator, flags)};
DescriptorAddendum *toAddendum{to.Addendum()};
const typeInfo::DerivedType *toDerived{
toAddendum ? toAddendum->derivedType() : nullptr};
if (toDerived && (flags & NeedFinalization) &&
toDerived->noFinalizationNeeded()) {
flags &= ~NeedFinalization;
}
std::size_t toElementBytes{to.ElementBytes()};
std::size_t fromElementBytes{from.ElementBytes()};
// The following lambda definition violates the conding style,
// but cuda-11.8 nvcc hits an internal error with the brace initialization.
auto isSimpleMemmove = [&]() {
return !toDerived && to.rank() == from.rank() && to.IsContiguous() &&
from.IsContiguous() && toElementBytes == fromElementBytes;
};
StaticDescriptor<maxRank, true, 10 /*?*/> deferredDeallocStatDesc;
Descriptor *deferDeallocation{nullptr};
if (MayAlias(to, from)) {
if (mustDeallocateLHS) {
deferDeallocation = &deferredDeallocStatDesc.descriptor();
std::memcpy(deferDeallocation, &to, to.SizeInBytes());
to.set_base_addr(nullptr);
} else if (!isSimpleMemmove()) {
// Handle LHS/RHS aliasing by copying RHS into a temp, then
// recursively assigning from that temp.
auto descBytes{from.SizeInBytes()};
StaticDescriptor<maxRank, true, 16> staticDesc;
Descriptor &newFrom{staticDesc.descriptor()};
std::memcpy(&newFrom, &from, descBytes);
// Pretend the temporary descriptor is for an ALLOCATABLE
// entity, otherwise, the Deallocate() below will not
// free the descriptor memory.
newFrom.raw().attribute = CFI_attribute_allocatable;
auto stat{ReturnError(terminator, newFrom.Allocate())};
if (stat == StatOk) {
if (HasDynamicComponent(from)) {
// If 'from' has allocatable/automatic component, we cannot
// just make a shallow copy of the descriptor member.
// This will still leave data overlap in 'to' and 'newFrom'.
// For example:
// type t
// character, allocatable :: c(:)
// end type t
// type(t) :: x(3)
// x(2:3) = x(1:2)
// We have to make a deep copy into 'newFrom' in this case.
RTNAME(AssignTemporary)
(newFrom, from, terminator.sourceFileName(), terminator.sourceLine());
} else {
ShallowCopy(newFrom, from, true, from.IsContiguous());
}
Assign(to, newFrom, terminator,
flags &
(NeedFinalization | ComponentCanBeDefinedAssignment |
ExplicitLengthCharacterLHS | CanBeDefinedAssignment));
newFrom.Deallocate();
}
return;
}
}
if (to.IsAllocatable()) {
if (mustDeallocateLHS) {
if (deferDeallocation) {
if ((flags & NeedFinalization) && toDerived) {
Finalize(to, *toDerived, &terminator);
flags &= ~NeedFinalization;
} else if (toDerived && !toDerived->noDestructionNeeded()) {
Destroy(to, /*finalize=*/false, *toDerived, &terminator);
}
} else {
to.Destroy((flags & NeedFinalization) != 0, /*destroyPointers=*/false,
&terminator);
flags &= ~NeedFinalization;
}
} else if (to.rank() != from.rank() && !to.IsAllocated()) {
terminator.Crash("Assign: mismatched ranks (%d != %d) in assignment to "
"unallocated allocatable",
to.rank(), from.rank());
}
if (!to.IsAllocated()) {
if (AllocateAssignmentLHS(to, from, terminator, flags) != StatOk) {
return;
}
flags &= ~NeedFinalization;
toElementBytes = to.ElementBytes(); // may have changed
}
}
if (toDerived && (flags & CanBeDefinedAssignment)) {
// Check for a user-defined assignment type-bound procedure;
// see 10.2.1.4-5. A user-defined assignment TBP defines all of
// the semantics, including allocatable (re)allocation and any
// finalization.
//
// Note that the aliasing and LHS (re)allocation handling above
// needs to run even with CanBeDefinedAssignment flag, when
// the Assign() is invoked recursively for component-per-component
// assignments.
if (to.rank() == 0) {
if (const auto *special{toDerived->FindSpecialBinding(
typeInfo::SpecialBinding::Which::ScalarAssignment)}) {
return DoScalarDefinedAssignment(to, from, *special);
}
}
if (const auto *special{toDerived->FindSpecialBinding(
typeInfo::SpecialBinding::Which::ElementalAssignment)}) {
return DoElementalDefinedAssignment(to, from, *toDerived, *special);
}
}
SubscriptValue toAt[maxRank];
to.GetLowerBounds(toAt);
// Scalar expansion of the RHS is implied by using the same empty
// subscript values on each (seemingly) elemental reference into
// "from".
SubscriptValue fromAt[maxRank];
from.GetLowerBounds(fromAt);
std::size_t toElements{to.Elements()};
if (from.rank() > 0 && toElements != from.Elements()) {
terminator.Crash("Assign: mismatching element counts in array assignment "
"(to %zd, from %zd)",
toElements, from.Elements());
}
if (to.type() != from.type()) {
terminator.Crash("Assign: mismatching types (to code %d != from code %d)",
to.type().raw(), from.type().raw());
}
if (toElementBytes > fromElementBytes && !to.type().IsCharacter()) {
terminator.Crash("Assign: mismatching non-character element sizes (to %zd "
"bytes != from %zd bytes)",
toElementBytes, fromElementBytes);
}
if (const typeInfo::DerivedType *
updatedToDerived{toAddendum ? toAddendum->derivedType() : nullptr}) {
// Derived type intrinsic assignment, which is componentwise and elementwise
// for all components, including parent components (10.2.1.2-3).
// The target is first finalized if still necessary (7.5.6.3(1))
if (flags & NeedFinalization) {
Finalize(to, *updatedToDerived, &terminator);
} else if (updatedToDerived && !updatedToDerived->noDestructionNeeded()) {
Destroy(to, /*finalize=*/false, *updatedToDerived, &terminator);
}
// Copy the data components (incl. the parent) first.
const Descriptor &componentDesc{updatedToDerived->component()};
std::size_t numComponents{componentDesc.Elements()};
for (std::size_t j{0}; j < toElements;
++j, to.IncrementSubscripts(toAt), from.IncrementSubscripts(fromAt)) {
for (std::size_t k{0}; k < numComponents; ++k) {
const auto &comp{
*componentDesc.ZeroBasedIndexedElement<typeInfo::Component>(
k)}; // TODO: exploit contiguity here
// Use PolymorphicLHS for components so that the right things happen
// when the components are polymorphic; when they're not, they're both
// not, and their declared types will match.
int nestedFlags{MaybeReallocate | PolymorphicLHS};
if (flags & ComponentCanBeDefinedAssignment) {
nestedFlags |=
CanBeDefinedAssignment | ComponentCanBeDefinedAssignment;
}
switch (comp.genre()) {
case typeInfo::Component::Genre::Data:
if (comp.category() == TypeCategory::Derived) {
StaticDescriptor<maxRank, true, 10 /*?*/> statDesc[2];
Descriptor &toCompDesc{statDesc[0].descriptor()};
Descriptor &fromCompDesc{statDesc[1].descriptor()};
comp.CreatePointerDescriptor(toCompDesc, to, terminator, toAt);
comp.CreatePointerDescriptor(
fromCompDesc, from, terminator, fromAt);
Assign(toCompDesc, fromCompDesc, terminator, nestedFlags);
} else { // Component has intrinsic type; simply copy raw bytes
std::size_t componentByteSize{comp.SizeInBytes(to)};
Fortran::runtime::memmove(to.Element<char>(toAt) + comp.offset(),
from.Element<const char>(fromAt) + comp.offset(),
componentByteSize);
}
break;
case typeInfo::Component::Genre::Pointer: {
std::size_t componentByteSize{comp.SizeInBytes(to)};
Fortran::runtime::memmove(to.Element<char>(toAt) + comp.offset(),
from.Element<const char>(fromAt) + comp.offset(),
componentByteSize);
} break;
case typeInfo::Component::Genre::Allocatable:
case typeInfo::Component::Genre::Automatic: {
auto *toDesc{reinterpret_cast<Descriptor *>(
to.Element<char>(toAt) + comp.offset())};
const auto *fromDesc{reinterpret_cast<const Descriptor *>(
from.Element<char>(fromAt) + comp.offset())};
// Allocatable components of the LHS are unconditionally
// deallocated before assignment (F'2018 10.2.1.3(13)(1)),
// unlike a "top-level" assignment to a variable, where
// deallocation is optional.
//
// Be careful not to destroy/reallocate the LHS, if there is
// overlap between LHS and RHS (it seems that partial overlap
// is not possible, though).
// Invoke Assign() recursively to deal with potential aliasing.
if (toDesc->IsAllocatable()) {
if (!fromDesc->IsAllocated()) {
// No aliasing.
//
// If to is not allocated, the Destroy() call is a no-op.
// This is just a shortcut, because the recursive Assign()
// below would initiate the destruction for to.
// No finalization is required.
toDesc->Destroy(
/*finalize=*/false, /*destroyPointers=*/false, &terminator);
continue; // F'2018 10.2.1.3(13)(2)
}
}
// Force LHS deallocation with DeallocateLHS flag.
// The actual deallocation may be avoided, if the existing
// location can be reoccupied.
Assign(*toDesc, *fromDesc, terminator, nestedFlags | DeallocateLHS);
} break;
}
}
// Copy procedure pointer components
const Descriptor &procPtrDesc{updatedToDerived->procPtr()};
std::size_t numProcPtrs{procPtrDesc.Elements()};
for (std::size_t k{0}; k < numProcPtrs; ++k) {
const auto &procPtr{
*procPtrDesc.ZeroBasedIndexedElement<typeInfo::ProcPtrComponent>(
k)};
Fortran::runtime::memmove(to.Element<char>(toAt) + procPtr.offset,
from.Element<const char>(fromAt) + procPtr.offset,
sizeof(typeInfo::ProcedurePointer));
}
}
} else { // intrinsic type, intrinsic assignment
if (isSimpleMemmove()) {
Fortran::runtime::memmove(to.raw().base_addr, from.raw().base_addr,
toElements * toElementBytes);
} else if (toElementBytes > fromElementBytes) { // blank padding
switch (to.type().raw()) {
case CFI_type_signed_char:
case CFI_type_char:
BlankPadCharacterAssignment<char>(to, from, toAt, fromAt, toElements,
toElementBytes, fromElementBytes);
break;
case CFI_type_char16_t:
BlankPadCharacterAssignment<char16_t>(to, from, toAt, fromAt,
toElements, toElementBytes, fromElementBytes);
break;
case CFI_type_char32_t:
BlankPadCharacterAssignment<char32_t>(to, from, toAt, fromAt,
toElements, toElementBytes, fromElementBytes);
break;
default:
terminator.Crash("unexpected type code %d in blank padded Assign()",
to.type().raw());
}
} else { // elemental copies, possibly with character truncation
for (std::size_t n{toElements}; n-- > 0;
to.IncrementSubscripts(toAt), from.IncrementSubscripts(fromAt)) {
Fortran::runtime::memmove(to.Element<char>(toAt),
from.Element<const char>(fromAt), toElementBytes);
}
}
}
if (deferDeallocation) {
// deferDeallocation is used only when LHS is an allocatable.
// The finalization has already been run for it.
deferDeallocation->Destroy(
/*finalize=*/false, /*destroyPointers=*/false, &terminator);
}
}
RT_OFFLOAD_API_GROUP_BEGIN
RT_API_ATTRS void DoFromSourceAssign(
Descriptor &alloc, const Descriptor &source, Terminator &terminator) {
if (alloc.rank() > 0 && source.rank() == 0) {
// The value of each element of allocate object becomes the value of source.
DescriptorAddendum *allocAddendum{alloc.Addendum()};
const typeInfo::DerivedType *allocDerived{
allocAddendum ? allocAddendum->derivedType() : nullptr};
SubscriptValue allocAt[maxRank];
alloc.GetLowerBounds(allocAt);
if (allocDerived) {
for (std::size_t n{alloc.Elements()}; n-- > 0;
alloc.IncrementSubscripts(allocAt)) {
Descriptor allocElement{*Descriptor::Create(*allocDerived,
reinterpret_cast<void *>(alloc.Element<char>(allocAt)), 0)};
Assign(allocElement, source, terminator, NoAssignFlags);
}
} else { // intrinsic type
for (std::size_t n{alloc.Elements()}; n-- > 0;
alloc.IncrementSubscripts(allocAt)) {
Fortran::runtime::memmove(alloc.Element<char>(allocAt),
source.raw().base_addr, alloc.ElementBytes());
}
}
} else {
Assign(alloc, source, terminator, NoAssignFlags);
}
}
RT_OFFLOAD_API_GROUP_END
extern "C" {
RT_EXT_API_GROUP_BEGIN
void RTDEF(Assign)(Descriptor &to, const Descriptor &from,
const char *sourceFile, int sourceLine) {
Terminator terminator{sourceFile, sourceLine};
// All top-level defined assignments can be recognized in semantics and
// will have been already been converted to calls, so don't check for
// defined assignment apart from components.
Assign(to, from, terminator,
MaybeReallocate | NeedFinalization | ComponentCanBeDefinedAssignment);
}
void RTDEF(AssignTemporary)(Descriptor &to, const Descriptor &from,
const char *sourceFile, int sourceLine) {
Terminator terminator{sourceFile, sourceLine};
// Initialize the "to" if it is of derived type that needs initialization.
if (const DescriptorAddendum * addendum{to.Addendum()}) {
if (const auto *derived{addendum->derivedType()}) {
// Do not invoke the initialization, if the descriptor is unallocated.
// AssignTemporary() is used for component-by-component assignments,
// for example, for structure constructors. This means that the LHS
// may be an allocatable component with unallocated status.
// The initialization will just fail in this case. By skipping
// the initialization we let Assign() automatically allocate
// and initialize the component according to the RHS.
// So we only need to initialize the LHS here if it is allocated.
// Note that initializing already initialized entity has no visible
// effect, though, it is assumed that the compiler does not initialize
// the temporary and leaves the initialization to this runtime code.
if (!derived->noInitializationNeeded() && to.IsAllocated()) {
if (ReturnError(terminator, Initialize(to, *derived, terminator)) !=
StatOk) {
return;
}
}
}
}
Assign(to, from, terminator, PolymorphicLHS);
}
void RTDEF(CopyInAssign)(Descriptor &temp, const Descriptor &var,
const char *sourceFile, int sourceLine) {
Terminator terminator{sourceFile, sourceLine};
temp = var;
temp.set_base_addr(nullptr);
temp.raw().attribute = CFI_attribute_allocatable;
RTNAME(AssignTemporary)(temp, var, sourceFile, sourceLine);
}
void RTDEF(CopyOutAssign)(
Descriptor *var, Descriptor &temp, const char *sourceFile, int sourceLine) {
Terminator terminator{sourceFile, sourceLine};
// Copyout from the temporary must not cause any finalizations
// for LHS. The variable must be properly initialized already.
if (var)
Assign(*var, temp, terminator, NoAssignFlags);
temp.Destroy(/*finalize=*/false, /*destroyPointers=*/false, &terminator);
}
void RTDEF(AssignExplicitLengthCharacter)(Descriptor &to,
const Descriptor &from, const char *sourceFile, int sourceLine) {
Terminator terminator{sourceFile, sourceLine};
Assign(to, from, terminator,
MaybeReallocate | NeedFinalization | ComponentCanBeDefinedAssignment |
ExplicitLengthCharacterLHS);
}
void RTDEF(AssignPolymorphic)(Descriptor &to, const Descriptor &from,
const char *sourceFile, int sourceLine) {
Terminator terminator{sourceFile, sourceLine};
Assign(to, from, terminator,
MaybeReallocate | NeedFinalization | ComponentCanBeDefinedAssignment |
PolymorphicLHS);
}
RT_EXT_API_GROUP_END
} // extern "C"
} // namespace Fortran::runtime
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