1//===-- lib/runtime/ragged.cpp ----------------------------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include "flang/Runtime/ragged.h"
10#include "flang-rt/runtime/tools.h"
11#include <cstdlib>
12
13namespace Fortran::runtime {
14
15inline RT_API_ATTRS bool isIndirection(const RaggedArrayHeader *const header) {
16 return header->flags & 1;
17}
18
19inline RT_API_ATTRS std::size_t rank(const RaggedArrayHeader *const header) {
20 return header->flags >> 1;
21}
22
23RT_API_ATTRS RaggedArrayHeader *RaggedArrayAllocate(RaggedArrayHeader *header,
24 bool isHeader, std::int64_t rank, std::int64_t elementSize,
25 std::int64_t *extentVector) {
26 if (header && rank) {
27 std::int64_t size{1};
28 for (std::int64_t counter{0}; counter < rank; ++counter) {
29 size *= extentVector[counter];
30 if (size <= 0) {
31 return nullptr;
32 }
33 }
34 header->flags = (rank << 1) | isHeader;
35 header->extentPointer = extentVector;
36 if (isHeader) {
37 elementSize = sizeof(RaggedArrayHeader);
38 }
39 Terminator terminator{__FILE__, __LINE__};
40 std::size_t bytes{static_cast<std::size_t>(elementSize * size)};
41 header->bufferPointer = AllocateMemoryOrCrash(terminator, bytes);
42 if (header->bufferPointer) {
43 std::memset(header->bufferPointer, 0, bytes);
44 }
45 return header;
46 } else {
47 return nullptr;
48 }
49}
50
51// Deallocate a ragged array from the heap.
52RT_API_ATTRS void RaggedArrayDeallocate(RaggedArrayHeader *raggedArrayHeader) {
53 if (raggedArrayHeader) {
54 if (std::size_t end{rank(raggedArrayHeader)}) {
55 if (isIndirection(raggedArrayHeader)) {
56 std::size_t linearExtent{1u};
57 for (std::size_t counter{0u}; counter < end && linearExtent > 0;
58 ++counter) {
59 linearExtent *= raggedArrayHeader->extentPointer[counter];
60 }
61 for (std::size_t counter{0u}; counter < linearExtent; ++counter) {
62 RaggedArrayDeallocate(&static_cast<RaggedArrayHeader *>(
63 raggedArrayHeader->bufferPointer)[counter]);
64 }
65 }
66 std::free(raggedArrayHeader->bufferPointer);
67 std::free(raggedArrayHeader->extentPointer);
68 raggedArrayHeader->flags = 0u;
69 }
70 }
71}
72
73extern "C" {
74void *RTDEF(RaggedArrayAllocate)(void *header, bool isHeader, std::int64_t rank,
75 std::int64_t elementSize, std::int64_t *extentVector) {
76 auto *result = RaggedArrayAllocate(static_cast<RaggedArrayHeader *>(header),
77 isHeader, rank, elementSize, extentVector);
78 return static_cast<void *>(result);
79}
80
81void RTDEF(RaggedArrayDeallocate)(void *raggedArrayHeader) {
82 RaggedArrayDeallocate(static_cast<RaggedArrayHeader *>(raggedArrayHeader));
83}
84} // extern "C"
85} // namespace Fortran::runtime
86

source code of flang-rt/lib/runtime/ragged.cpp