wehub-resource-sync
148 lines
4.8 KiB
C++
148 lines
4.8 KiB
C++
/* Copyright 2018 The TensorFlow Authors. All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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==============================================================================*/
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#include <fcntl.h>
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#include <stddef.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <cerrno>
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#include "tensorflow/compiler/mlir/lite/allocation.h"
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#include "tensorflow/compiler/mlir/lite/core/api/error_reporter.h"
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#include "tensorflow/lite/util.h"
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namespace tflite {
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namespace {
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size_t GetFdSizeBytes(int fd) {
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if (fd < 0) {
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return 0;
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}
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struct stat fd_stat;
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if (fstat(fd, &fd_stat) != 0) {
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return 0;
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}
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return fd_stat.st_size;
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}
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} // namespace
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MMAPAllocation::MMAPAllocation(const char* filename,
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ErrorReporter* error_reporter, bool map_private)
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: MMAPAllocation(error_reporter, open(filename, O_RDONLY), map_private) {
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if (mmap_fd_ == -1) {
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TF_LITE_REPORT_ERROR(error_reporter, "Could not open '%s'.", filename);
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}
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}
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MMAPAllocation::MMAPAllocation(int fd, ErrorReporter* error_reporter,
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bool map_private)
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: MMAPAllocation(error_reporter, dup(fd), map_private) {
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if (mmap_fd_ == -1) {
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TF_LITE_REPORT_ERROR(error_reporter, "Failed to dup '%d' file descriptor.",
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fd);
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}
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}
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MMAPAllocation::MMAPAllocation(const char* filename, size_t offset,
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size_t length, ErrorReporter* error_reporter,
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bool map_private)
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: MMAPAllocation(error_reporter, open(filename, O_RDONLY), offset, length,
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map_private) {
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if (mmap_fd_ == -1) {
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TF_LITE_REPORT_ERROR(error_reporter, "Could not open '%s'.", filename);
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}
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}
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MMAPAllocation::MMAPAllocation(int fd, size_t offset, size_t length,
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ErrorReporter* error_reporter, bool map_private)
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: MMAPAllocation(error_reporter, dup(fd), offset, length, map_private) {
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if (mmap_fd_ == -1) {
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TF_LITE_REPORT_ERROR(error_reporter, "Failed to dup '%d' file descriptor.",
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fd);
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}
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}
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MMAPAllocation::MMAPAllocation(ErrorReporter* error_reporter, int owned_fd,
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bool map_private)
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: MMAPAllocation(error_reporter, owned_fd, /*offset=*/0,
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/*length=*/GetFdSizeBytes(owned_fd), map_private) {}
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MMAPAllocation::MMAPAllocation(ErrorReporter* error_reporter, int owned_fd,
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size_t offset, size_t length, bool map_private)
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: Allocation(error_reporter, Allocation::Type::kMMap),
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mmap_fd_(owned_fd),
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mmapped_buffer_(MAP_FAILED),
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buffer_size_bytes_(length) {
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if (owned_fd < 0) {
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return;
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}
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static int pagesize = sysconf(_SC_PAGE_SIZE);
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offset_in_buffer_ = offset % pagesize;
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offset_of_buffer_in_file_ = offset - offset_in_buffer_;
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size_t file_size = GetFdSizeBytes(mmap_fd_);
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CheckedInt<size_t> checked_length_offset =
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CheckedInt<size_t>(length) + offset;
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if (checked_length_offset.Overflow() ||
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checked_length_offset.Value() > file_size) {
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TF_LITE_REPORT_ERROR(error_reporter,
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"Asked to mmap '%d' bytes from fd '%d' at offset "
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"'%d'. This is over the length of file '%d'.",
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length, mmap_fd_, offset, file_size);
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return;
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}
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mmapped_buffer_ = mmap(nullptr, /*__len=*/length + offset_in_buffer_,
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map_private ? (PROT_READ | PROT_WRITE) : PROT_READ,
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map_private ? MAP_PRIVATE : MAP_SHARED, mmap_fd_,
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/*__offset=*/offset_of_buffer_in_file_);
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if (mmapped_buffer_ == MAP_FAILED) {
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TF_LITE_REPORT_ERROR(error_reporter,
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"Mmap of '%d' at offset '%d' failed with error '%d'.",
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mmap_fd_, offset, errno);
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return;
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}
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}
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MMAPAllocation::~MMAPAllocation() {
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if (valid()) {
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munmap(const_cast<void*>(mmapped_buffer_),
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buffer_size_bytes_ + offset_in_buffer_);
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}
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if (mmap_fd_ >= 0) {
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close(mmap_fd_);
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}
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}
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const void* MMAPAllocation::base() const {
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return reinterpret_cast<const void*>(
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reinterpret_cast<const char*>(mmapped_buffer_) + offset_in_buffer_);
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}
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size_t MMAPAllocation::bytes() const { return buffer_size_bytes_; }
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bool MMAPAllocation::valid() const { return mmapped_buffer_ != MAP_FAILED; }
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bool MMAPAllocation::IsSupported() { return true; }
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} // namespace tflite
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