65f5290432
Define an API for, and implement, runtime support for arbitrary assignment of one descriptor's data to another, with full support for (re)allocation of allocatables with finalization when necessary, user-defined derived type assignment TBP calls, and intrinsic (default) componentwise assignment of derived type instances with allocation of automatic components. Also clean up API and implementation of finalization/destruction using knowledge gained while studying edge cases for assignment in the 2018 standard. The look-up procedure for special procedure bindings in derived types has been optimized from O(N) to O(1) since it will probably matter more. This required some analysis in runtime derived type description table construction in semantics and some changes to the table schemata. Executable Fortran tests have been developed; they'll be added to the test base once they can be lowered and run by f18. Differential Revision: https://reviews.llvm.org/D107678
118 lines
4.1 KiB
C++
118 lines
4.1 KiB
C++
//===-- runtime/allocatable.cpp -------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "allocatable.h"
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#include "assign.h"
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#include "derived.h"
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#include "stat.h"
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#include "terminator.h"
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#include "type-info.h"
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namespace Fortran::runtime {
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extern "C" {
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void RTNAME(AllocatableInitIntrinsic)(Descriptor &descriptor,
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TypeCategory category, int kind, int rank, int corank) {
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INTERNAL_CHECK(corank == 0);
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descriptor.Establish(TypeCode{category, kind},
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Descriptor::BytesFor(category, kind), nullptr, rank, nullptr,
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CFI_attribute_allocatable);
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}
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void RTNAME(AllocatableInitCharacter)(Descriptor &descriptor,
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SubscriptValue length, int kind, int rank, int corank) {
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INTERNAL_CHECK(corank == 0);
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descriptor.Establish(
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kind, length, nullptr, rank, nullptr, CFI_attribute_allocatable);
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}
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void RTNAME(AllocatableInitDerived)(Descriptor &descriptor,
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const typeInfo::DerivedType &derivedType, int rank, int corank) {
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INTERNAL_CHECK(corank == 0);
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descriptor.Establish(
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derivedType, nullptr, rank, nullptr, CFI_attribute_allocatable);
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}
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int RTNAME(MoveAlloc)(Descriptor &to, const Descriptor & /*from*/,
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bool /*hasStat*/, const Descriptor * /*errMsg*/,
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const char * /*sourceFile*/, int /*sourceLine*/) {
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INTERNAL_CHECK(false); // TODO: MoveAlloc is not yet implemented
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return StatOk;
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}
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void RTNAME(AllocatableSetBounds)(Descriptor &descriptor, int zeroBasedDim,
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SubscriptValue lower, SubscriptValue upper) {
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INTERNAL_CHECK(zeroBasedDim >= 0 && zeroBasedDim < descriptor.rank());
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descriptor.GetDimension(zeroBasedDim).SetBounds(lower, upper);
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// The byte strides are computed when the object is allocated.
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}
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void RTNAME(AllocatableSetDerivedLength)(
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Descriptor &descriptor, int which, SubscriptValue x) {
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DescriptorAddendum *addendum{descriptor.Addendum()};
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INTERNAL_CHECK(addendum != nullptr);
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addendum->SetLenParameterValue(which, x);
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}
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void RTNAME(AllocatableApplyMold)(
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Descriptor &descriptor, const Descriptor &mold) {
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descriptor = mold;
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descriptor.set_base_addr(nullptr);
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descriptor.raw().attribute = CFI_attribute_allocatable;
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}
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int RTNAME(AllocatableAllocate)(Descriptor &descriptor, bool hasStat,
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const Descriptor *errMsg, const char *sourceFile, int sourceLine) {
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Terminator terminator{sourceFile, sourceLine};
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if (!descriptor.IsAllocatable()) {
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return ReturnError(terminator, StatInvalidDescriptor, errMsg, hasStat);
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}
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if (descriptor.IsAllocated()) {
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return ReturnError(terminator, StatBaseNotNull, errMsg, hasStat);
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}
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int stat{ReturnError(terminator, descriptor.Allocate(), errMsg, hasStat)};
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if (stat == StatOk) {
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if (const DescriptorAddendum * addendum{descriptor.Addendum()}) {
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if (const auto *derived{addendum->derivedType()}) {
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if (!derived->noInitializationNeeded()) {
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stat = Initialize(descriptor, *derived, terminator, hasStat, errMsg);
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}
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}
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}
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}
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return stat;
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}
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int RTNAME(AllocatableDeallocate)(Descriptor &descriptor, bool hasStat,
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const Descriptor *errMsg, const char *sourceFile, int sourceLine) {
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Terminator terminator{sourceFile, sourceLine};
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if (!descriptor.IsAllocatable()) {
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return ReturnError(terminator, StatInvalidDescriptor, errMsg, hasStat);
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}
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if (!descriptor.IsAllocated()) {
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return ReturnError(terminator, StatBaseNull, errMsg, hasStat);
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}
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return ReturnError(terminator, descriptor.Destroy(true), errMsg, hasStat);
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}
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void RTNAME(AllocatableDeallocateNoFinal)(
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Descriptor &descriptor, const char *sourceFile, int sourceLine) {
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Terminator terminator{sourceFile, sourceLine};
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if (!descriptor.IsAllocatable()) {
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ReturnError(terminator, StatInvalidDescriptor);
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} else if (!descriptor.IsAllocated()) {
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ReturnError(terminator, StatBaseNull);
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} else {
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ReturnError(terminator, descriptor.Destroy(false));
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}
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}
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// TODO: AllocatableCheckLengthParameter, AllocatableAllocateSource
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}
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} // namespace Fortran::runtime
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