//===-- include/flang/Runtime/pointer.h -------------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
// Defines APIs for Fortran runtime library support of code generated
// to manipulate and query data pointers.
#ifndef FORTRAN_RUNTIME_POINTER_H_
#define FORTRAN_RUNTIME_POINTER_H_
#include "flang/Runtime/descriptor.h"
#include "flang/Runtime/entry-names.h"
namespace Fortran::runtime {
extern "C" {
// Data pointer initialization for NULLIFY(), "p=>NULL()`, & for ALLOCATE().
// Initializes a pointer to a disassociated state for NULLIFY() or "p=>NULL()".
void RTDECL(PointerNullifyIntrinsic)(
Descriptor &, TypeCategory, int kind, int rank = 0, int corank = 0);
void RTDECL(PointerNullifyCharacter)(Descriptor &, SubscriptValue length = 0,
int kind = 1, int rank = 0, int corank = 0);
void RTDECL(PointerNullifyDerived)(
Descriptor &, const typeInfo::DerivedType &, int rank = 0, int corank = 0);
// Explicitly sets the bounds of an initialized disassociated pointer.
// The upper cobound is ignored for the last codimension.
void RTDECL(PointerSetBounds)(
Descriptor &, int zeroBasedDim, SubscriptValue lower, SubscriptValue upper);
void RTDECL(PointerSetCoBounds)(Descriptor &, int zeroBasedCoDim,
SubscriptValue lower, SubscriptValue upper = 0);
// Length type parameters are indexed in declaration order; i.e., 0 is the
// first length type parameter in the deepest base type. (Not for use
// with CHARACTER; see above.)
void RTDECL(PointerSetDerivedLength)(Descriptor &, int which, SubscriptValue);
// For MOLD= allocation: acquires information from another descriptor
// to initialize a null data pointer.
void RTDECL(PointerApplyMold)(
Descriptor &, const Descriptor &mold, int rank = 0);
// Data pointer association for "p=>TARGET"
// Associates a scalar pointer with a simple scalar target.
void RTDECL(PointerAssociateScalar)(Descriptor &, void *);
// Associates a pointer with a target of the same rank, possibly with new lower
// bounds, which are passed in a vector whose length must equal the rank.
void RTDECL(PointerAssociate)(Descriptor &, const Descriptor &target);
void RTDECL(PointerAssociateLowerBounds)(
Descriptor &, const Descriptor &target, const Descriptor &lowerBounds);
// Associates a pointer with a target with bounds remapping. The target must be
// simply contiguous &/or of rank 1. The bounds constitute a [2,newRank]
// integer array whose columns are [lower bound, upper bound] on each dimension.
void RTDECL(PointerAssociateRemapping)(Descriptor &, const Descriptor &target,
const Descriptor &bounds, const char *sourceFile = nullptr,
int sourceLine = 0);
// Data pointer allocation and deallocation
// When an explicit type-spec appears in an ALLOCATE statement for an
// pointer with an explicit (non-deferred) length type paramater for
// a derived type or CHARACTER value, the explicit value has to match
// the length type parameter's value. This API checks that requirement.
// Returns 0 for success, or the STAT= value on failure with hasStat==true.
int RTDECL(PointerCheckLengthParameter)(Descriptor &,
int which /* 0 for CHARACTER length */, SubscriptValue other,
bool hasStat = false, const Descriptor *errMsg = nullptr,
const char *sourceFile = nullptr, int sourceLine = 0);
// Allocates a data pointer. Its descriptor must have been initialized
// and its bounds and length type parameters set. It need not be disassociated.
// On failure, if hasStat is true, returns a nonzero error code for
// STAT= and (if present) fills in errMsg; if hasStat is false, the
// image is terminated. On success, leaves errMsg alone and returns zero.
// Successfully allocated memory is initialized if the pointer has a
// derived type, and is always initialized by PointerAllocateSource().
// Performs all necessary coarray synchronization and validation actions.
int RTDECL(PointerAllocate)(Descriptor &, bool hasStat = false,
const Descriptor *errMsg = nullptr, const char *sourceFile = nullptr,
int sourceLine = 0);
int RTDECL(PointerAllocateSource)(Descriptor &, const Descriptor &source,
bool hasStat = false, const Descriptor *errMsg = nullptr,
const char *sourceFile = nullptr, int sourceLine = 0);
// Deallocates a data pointer, which must have been allocated by
// PointerAllocate(), possibly copied with PointerAssociate().
// Finalizes elements &/or components as needed. The pointer is left
// in an initialized disassociated state suitable for reallocation
// with the same bounds, cobounds, and length type parameters.
int RTDECL(PointerDeallocate)(Descriptor &, bool hasStat = false,
const Descriptor *errMsg = nullptr, const char *sourceFile = nullptr,
int sourceLine = 0);
// Same as PointerDeallocate but also set the dynamic type as the declared type
// as mentioned in 7.3.2.3 note 7.
int RTDECL(PointerDeallocatePolymorphic)(Descriptor &,
const typeInfo::DerivedType *, bool hasStat = false,
const Descriptor *errMsg = nullptr, const char *sourceFile = nullptr,
int sourceLine = 0);
// Association inquiries for ASSOCIATED()
// True when the pointer is not disassociated.
bool RTDECL(PointerIsAssociated)(const Descriptor &);
// True when the pointer is associated with a specific target.
bool RTDECL(PointerIsAssociatedWith)(
const Descriptor &, const Descriptor *target);
// Fortran POINTERs are allocated with an extra validation word after their
// payloads in order to detect erroneous deallocations later.
RT_API_ATTRS void *AllocateValidatedPointerPayload(std::size_t);
RT_API_ATTRS bool ValidatePointerPayload(const ISO::CFI_cdesc_t &);
} // extern "C"
} // namespace Fortran::runtime
#endif // FORTRAN_RUNTIME_POINTER_H_
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