7da3e2c1d4
This allows more flexibility in providing models from alternative sources. Also add a `MMAPAllocation(int fd)` API for enabling user-provided file descriptors as model sources. Resolves #46593. PiperOrigin-RevId: 358931162 Change-Id: I6a443f73f7bce2c0c18dc35f20650715170365cb
78 lines
2.4 KiB
C++
78 lines
2.4 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 "tensorflow/lite/allocation.h"
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#include "tensorflow/lite/core/api/error_reporter.h"
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namespace tflite {
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MMAPAllocation::MMAPAllocation(const char* filename,
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ErrorReporter* error_reporter)
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: MMAPAllocation(error_reporter, open(filename, O_RDONLY)) {
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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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: MMAPAllocation(error_reporter, dup(fd)) {
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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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: 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_(0) {
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if (mmap_fd_ == -1) {
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return;
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}
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struct stat sb;
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fstat(mmap_fd_, &sb);
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buffer_size_bytes_ = sb.st_size;
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mmapped_buffer_ =
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mmap(nullptr, buffer_size_bytes_, PROT_READ, MAP_SHARED, mmap_fd_, 0);
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if (mmapped_buffer_ == MAP_FAILED) {
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TF_LITE_REPORT_ERROR(error_reporter, "Mmap of '%d' failed.", mmap_fd_);
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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_), buffer_size_bytes_);
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}
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if (mmap_fd_ != -1) close(mmap_fd_);
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}
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const void* MMAPAllocation::base() const { return mmapped_buffer_; }
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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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