1/* Copyright 2017 The TensorFlow Authors. All Rights Reserved.
2
3Licensed under the Apache License, Version 2.0 (the "License");
4you may not use this file except in compliance with the License.
5You may obtain a copy of the License at
6
7 http://www.apache.org/licenses/LICENSE-2.0
8
9Unless required by applicable law or agreed to in writing, software
10distributed under the License is distributed on an "AS IS" BASIS,
11WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12See the License for the specific language governing permissions and
13limitations under the License.
14==============================================================================*/
15
16#include "tensorflow/lite/allocation.h"
17
18#include <stddef.h>
19#include <sys/stat.h>
20#include <sys/types.h>
21
22#include <cstdint>
23#include <cstdio>
24#include <memory>
25
26#include "tensorflow/lite/core/api/error_reporter.h"
27
28namespace tflite {
29
30#ifndef TFLITE_MCU
31FileCopyAllocation::FileCopyAllocation(const char* filename,
32 ErrorReporter* error_reporter)
33 : Allocation(error_reporter, Allocation::Type::kFileCopy) {
34 // Obtain the file size using fstat, or report an error if that fails.
35 std::unique_ptr<FILE, decltype(&fclose)> file(fopen(filename, "rb"), fclose);
36 if (!file) {
37 error_reporter_->Report("Could not open '%s'.", filename);
38 return;
39 }
40 struct stat sb;
41
42// support usage of msvc's posix-like fileno symbol
43#ifdef _WIN32
44#define FILENO(_x) _fileno(_x)
45#else
46#define FILENO(_x) fileno(_x)
47#endif
48 if (fstat(FILENO(file.get()), &sb) != 0) {
49 error_reporter_->Report("Failed to get file size of '%s'.", filename);
50 return;
51 }
52#undef FILENO
53 buffer_size_bytes_ = sb.st_size;
54 std::unique_ptr<char[]> buffer(new char[buffer_size_bytes_]);
55 if (!buffer) {
56 error_reporter_->Report("Malloc of buffer to hold copy of '%s' failed.",
57 filename);
58 return;
59 }
60 size_t bytes_read =
61 fread(buffer.get(), sizeof(char), buffer_size_bytes_, file.get());
62 if (bytes_read != buffer_size_bytes_) {
63 error_reporter_->Report("Read of '%s' failed (too few bytes read).",
64 filename);
65 return;
66 }
67 // Versions of GCC before 6.2.0 don't support std::move from non-const
68 // char[] to const char[] unique_ptrs.
69 copied_buffer_.reset(const_cast<char const*>(buffer.release()));
70}
71
72FileCopyAllocation::~FileCopyAllocation() {}
73
74const void* FileCopyAllocation::base() const { return copied_buffer_.get(); }
75
76size_t FileCopyAllocation::bytes() const { return buffer_size_bytes_; }
77
78bool FileCopyAllocation::valid() const { return copied_buffer_ != nullptr; }
79#endif
80
81MemoryAllocation::MemoryAllocation(const void* ptr, size_t num_bytes,
82 ErrorReporter* error_reporter)
83 : Allocation(error_reporter, Allocation::Type::kMemory) {
84#ifdef __arm__
85 if ((reinterpret_cast<uintptr_t>(ptr) & 0x3) != 0) {
86 // The flatbuffer schema has alignment requirements of up to 16 bytes to
87 // guarantee that data can be correctly accesses by various backends.
88 // Therefore, model pointer should also be 16-bytes aligned to preserve this
89 // requirement. But this condition only checks 4-bytes alignment which is
90 // the mininum requirement to prevent SIGBUS fault on 32bit ARM. Some models
91 // could require 8 or 16 bytes alignment which is not checked yet.
92 //
93 // Note that 64-bit ARM may also suffer a performance impact, but no crash -
94 // that case is not checked.
95 TF_LITE_REPORT_ERROR(error_reporter,
96 "The supplied buffer is not 4-bytes aligned");
97 buffer_ = nullptr;
98 buffer_size_bytes_ = 0;
99 return;
100 }
101#endif // __arm__
102
103 buffer_ = ptr;
104 buffer_size_bytes_ = num_bytes;
105}
106
107MemoryAllocation::~MemoryAllocation() {}
108
109const void* MemoryAllocation::base() const { return buffer_; }
110
111size_t MemoryAllocation::bytes() const { return buffer_size_bytes_; }
112
113bool MemoryAllocation::valid() const { return buffer_ != nullptr; }
114
115} // namespace tflite
116