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//===-- runtime/pointer.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/pointer.h"
#include "derived.h"
#include "stat.h"
#include "terminator.h"
#include "tools.h"
#include "type-info.h"
namespace Fortran::runtime {
extern "C" {
void RTNAME(PointerNullifyIntrinsic)(Descriptor &pointer, TypeCategory category,
int kind, int rank, int corank) {
INTERNAL_CHECK(corank == 0);
pointer.Establish(TypeCode{category, kind},
Descriptor::BytesFor(category, kind), nullptr, rank, nullptr,
CFI_attribute_pointer);
}
void RTNAME(PointerNullifyCharacter)(Descriptor &pointer, SubscriptValue length,
int kind, int rank, int corank) {
INTERNAL_CHECK(corank == 0);
pointer.Establish(
kind, length, nullptr, rank, nullptr, CFI_attribute_pointer);
}
void RTNAME(PointerNullifyDerived)(Descriptor &pointer,
const typeInfo::DerivedType &derivedType, int rank, int corank) {
INTERNAL_CHECK(corank == 0);
pointer.Establish(derivedType, nullptr, rank, nullptr, CFI_attribute_pointer);
}
void RTNAME(PointerSetBounds)(Descriptor &pointer, int zeroBasedDim,
SubscriptValue lower, SubscriptValue upper) {
INTERNAL_CHECK(zeroBasedDim >= 0 && zeroBasedDim < pointer.rank());
pointer.GetDimension(zeroBasedDim).SetBounds(lower, upper);
// The byte strides are computed when the pointer is allocated.
}
// TODO: PointerSetCoBounds
void RTNAME(PointerSetDerivedLength)(
Descriptor &pointer, int which, SubscriptValue x) {
DescriptorAddendum *addendum{pointer.Addendum()};
INTERNAL_CHECK(addendum != nullptr);
addendum->SetLenParameterValue(which, x);
}
void RTNAME(PointerApplyMold)(Descriptor &pointer, const Descriptor &mold) {
pointer = mold;
pointer.set_base_addr(nullptr);
pointer.raw().attribute = CFI_attribute_pointer;
}
void RTNAME(PointerAssociateScalar)(Descriptor &pointer, void *target) {
pointer.set_base_addr(target);
}
void RTNAME(PointerAssociate)(Descriptor &pointer, const Descriptor &target) {
pointer = target;
pointer.raw().attribute = CFI_attribute_pointer;
}
void RTNAME(PointerAssociateLowerBounds)(Descriptor &pointer,
const Descriptor &target, const Descriptor &lowerBounds) {
pointer = target;
pointer.raw().attribute = CFI_attribute_pointer;
int rank{pointer.rank()};
Terminator terminator{__FILE__, __LINE__};
std::size_t boundElementBytes{lowerBounds.ElementBytes()};
for (int j{0}; j < rank; ++j) {
pointer.GetDimension(j).SetLowerBound(
GetInt64(lowerBounds.ZeroBasedIndexedElement<const char>(j),
boundElementBytes, terminator));
}
}
void RTNAME(PointerAssociateRemapping)(Descriptor &pointer,
const Descriptor &target, const Descriptor &bounds, const char *sourceFile,
int sourceLine) {
pointer = target;
pointer.raw().attribute = CFI_attribute_pointer;
int rank{pointer.rank()};
Terminator terminator{sourceFile, sourceLine};
SubscriptValue byteStride{/*captured from first dimension*/};
std::size_t boundElementBytes{bounds.ElementBytes()};
for (int j{0}; j < rank; ++j) {
auto &dim{pointer.GetDimension(j)};
dim.SetBounds(GetInt64(bounds.ZeroBasedIndexedElement<const char>(2 * j),
boundElementBytes, terminator),
GetInt64(bounds.ZeroBasedIndexedElement<const char>(2 * j + 1),
boundElementBytes, terminator));
if (j == 0) {
byteStride = dim.ByteStride();
} else {
dim.SetByteStride(byteStride);
byteStride *= dim.Extent();
}
}
if (pointer.Elements() > target.Elements()) {
terminator.Crash("PointerAssociateRemapping: too many elements in remapped "
"pointer (%zd > %zd)",
pointer.Elements(), target.Elements());
}
}
int RTNAME(PointerAllocate)(Descriptor &pointer, bool hasStat,
const Descriptor *errMsg, const char *sourceFile, int sourceLine) {
Terminator terminator{sourceFile, sourceLine};
if (!pointer.IsPointer()) {
return ReturnError(terminator, StatInvalidDescriptor, errMsg, hasStat);
}
int stat{ReturnError(terminator, pointer.Allocate(), errMsg, hasStat)};
if (stat == StatOk) {
if (const DescriptorAddendum * addendum{pointer.Addendum()}) {
if (const auto *derived{addendum->derivedType()}) {
if (!derived->noInitializationNeeded()) {
stat = Initialize(pointer, *derived, terminator, hasStat, errMsg);
}
}
}
}
return stat;
}
int RTNAME(PointerDeallocate)(Descriptor &pointer, bool hasStat,
const Descriptor *errMsg, const char *sourceFile, int sourceLine) {
Terminator terminator{sourceFile, sourceLine};
if (!pointer.IsPointer()) {
return ReturnError(terminator, StatInvalidDescriptor, errMsg, hasStat);
}
if (!pointer.IsAllocated()) {
return ReturnError(terminator, StatBaseNull, errMsg, hasStat);
}
return ReturnError(terminator, pointer.Destroy(true), errMsg, hasStat);
}
bool RTNAME(PointerIsAssociated)(const Descriptor &pointer) {
return pointer.raw().base_addr != nullptr;
}
bool RTNAME(PointerIsAssociatedWith)(
const Descriptor &pointer, const Descriptor &target) {
int rank{pointer.rank()};
if (pointer.raw().base_addr != target.raw().base_addr ||
pointer.ElementBytes() != target.ElementBytes() ||
rank != target.rank()) {
return false;
}
for (int j{0}; j < rank; ++j) {
const Dimension &pDim{pointer.GetDimension(j)};
const Dimension &tDim{target.GetDimension(j)};
if (pDim.Extent() != tDim.Extent() ||
pDim.ByteStride() != tDim.ByteStride()) {
return false;
}
}
return true;
}
// TODO: PointerCheckLengthParameter, PointerAllocateSource
} // extern "C"
} // namespace Fortran::runtime
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