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//===-- runtime/ragged.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/ragged.h"
#include <cstdlib>
namespace Fortran::runtime {
inline bool isIndirection(const RaggedArrayHeader *const header) {
return header->flags & 1;
}
inline std::size_t rank(const RaggedArrayHeader *const header) {
return header->flags >> 1;
}
RaggedArrayHeader *RaggedArrayAllocate(RaggedArrayHeader *header, bool isHeader,
std::int64_t rank, std::int64_t elementSize, std::int64_t *extentVector) {
if (header && rank) {
std::int64_t size{1};
for (std::int64_t counter{0}; counter < rank; ++counter) {
size *= extentVector[counter];
if (size <= 0) {
return nullptr;
}
}
header->flags = (rank << 1) | isHeader;
header->extentPointer = extentVector;
if (isHeader) {
header->bufferPointer = std::calloc(sizeof(RaggedArrayHeader), size);
} else {
header->bufferPointer =
static_cast<void *>(std::calloc(elementSize, size));
}
return header;
} else {
return nullptr;
}
}
// Deallocate a ragged array from the heap.
void RaggedArrayDeallocate(RaggedArrayHeader *raggedArrayHeader) {
if (raggedArrayHeader) {
if (std::size_t end{rank(raggedArrayHeader)}) {
if (isIndirection(raggedArrayHeader)) {
std::size_t linearExtent{1u};
for (std::size_t counter{0u}; counter < end && linearExtent > 0;
++counter) {
linearExtent *= raggedArrayHeader->extentPointer[counter];
}
for (std::size_t counter{0u}; counter < linearExtent; ++counter) {
RaggedArrayDeallocate(&static_cast<RaggedArrayHeader *>(
raggedArrayHeader->bufferPointer)[counter]);
}
}
std::free(raggedArrayHeader->bufferPointer);
std::free(raggedArrayHeader->extentPointer);
raggedArrayHeader->flags = 0u;
}
}
}
extern "C" {
void *RTNAME(RaggedArrayAllocate)(void *header, bool isHeader,
std::int64_t rank, std::int64_t elementSize, std::int64_t *extentVector) {
auto *result = RaggedArrayAllocate(static_cast<RaggedArrayHeader *>(header),
isHeader, rank, elementSize, extentVector);
return static_cast<void *>(result);
}
void RTNAME(RaggedArrayDeallocate)(void *raggedArrayHeader) {
RaggedArrayDeallocate(static_cast<RaggedArrayHeader *>(raggedArrayHeader));
}
} // extern "C"
} // namespace Fortran::runtime
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