base/profiler/chrome_unwind_info_android.cc

   1 // Copyright 2021 The Chromium Authors
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/profiler/chrome_unwind_info_android.h"
   6
   7 #include "base/containers/buffer_iterator.h"
   8
   9 namespace base {
  10
  11 ChromeUnwindInfoAndroid::ChromeUnwindInfoAndroid(
  12     span<const uint8_t> unwind_instruction_table,
  13     span<const uint8_t> function_offset_table,
  14     span<const FunctionTableEntry> function_table,
  15     span<const uint32_t> page_table)
  16     : unwind_instruction_table(unwind_instruction_table),
  17       function_offset_table(function_offset_table),
  18       function_table(function_table),
  19       page_table(page_table) {}
  20
  21 ChromeUnwindInfoAndroid::~ChromeUnwindInfoAndroid() = default;
  22 ChromeUnwindInfoAndroid::ChromeUnwindInfoAndroid(
  23     const ChromeUnwindInfoAndroid& other) = default;
  24 ChromeUnwindInfoAndroid& ChromeUnwindInfoAndroid::operator=(
  25     const ChromeUnwindInfoAndroid& other) = default;
  26
  27 ChromeUnwindInfoAndroid::ChromeUnwindInfoAndroid(
  28     ChromeUnwindInfoAndroid&& other) = default;
  29 ChromeUnwindInfoAndroid& ChromeUnwindInfoAndroid::operator=(
  30     ChromeUnwindInfoAndroid&& other) = default;
  31
  32 ChromeUnwindInfoAndroid CreateChromeUnwindInfoAndroid(
  33     span<const uint8_t> data) {
  34   BufferIterator<const uint8_t> data_iterator(data);
  35
  36   const auto* header = data_iterator.Object<ChromeUnwindInfoHeaderAndroid>();
  37   DCHECK(header);
  38
  39   data_iterator.Seek(header->page_table_byte_offset);
  40   const auto page_table =
  41       data_iterator.Span<uint32_t>(header->page_table_entries);
  42   DCHECK(!page_table.empty());
  43
  44   data_iterator.Seek(header->function_offset_table_byte_offset);
  45   const auto function_offset_table =
  46       data_iterator.Span<uint8_t>(header->function_offset_table_size_in_bytes);
  47   DCHECK(!function_offset_table.empty());
  48
  49   data_iterator.Seek(header->function_table_byte_offset);
  50   const auto function_table =
  51       data_iterator.Span<FunctionTableEntry>(header->function_table_entries);
  52   DCHECK(!function_table.empty());
  53
  54   data_iterator.Seek(header->unwind_instruction_table_byte_offset);
  55   const auto unwind_instruction_table = data_iterator.Span<uint8_t>(
  56       header->unwind_instruction_table_size_in_bytes);
  57   DCHECK(!unwind_instruction_table.empty());
  58
  59   return ChromeUnwindInfoAndroid{unwind_instruction_table,
  60                                  function_offset_table, function_table,
  61                                  page_table};
  62 }
  63
  64 }  // namespace base