| /* |
| * Copyright (C) 2020 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| // This is a header-only file because we want to use this in the ART plugin, |
| // which should not depend on any Perfetto compilation units other than the |
| // client API. |
| |
| #ifndef INCLUDE_PERFETTO_PROFILING_PARSE_SMAPS_H_ |
| #define INCLUDE_PERFETTO_PROFILING_PARSE_SMAPS_H_ |
| |
| #include <errno.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <unistd.h> |
| |
| #include <cinttypes> |
| #include <string> |
| |
| namespace perfetto { |
| namespace profiling { |
| |
| struct SmapsEntry { |
| int64_t size_kb = -1; |
| int64_t private_dirty_kb = -1; |
| int64_t swap_kb = -1; |
| std::string pathname; |
| }; |
| |
| struct SmapsParserState { |
| bool parsed_header = false; |
| SmapsEntry current_entry{}; |
| }; |
| |
| template <typename T> |
| static bool ParseSmaps(FILE* f, T callback) { |
| SmapsParserState state; |
| |
| size_t line_size = 1024; |
| char* line = static_cast<char*>(malloc(line_size)); |
| |
| for (;;) { |
| errno = 0; |
| ssize_t rd = getline(&line, &line_size, f); |
| if (rd == -1) { |
| free(line); |
| if (state.parsed_header) |
| callback(state.current_entry); |
| return errno == 0; |
| } else { |
| if (line[rd - 1] == '\n') { |
| line[rd - 1] = '\0'; |
| rd--; |
| } |
| if (!ParseSmapsLine(line, static_cast<size_t>(rd), &state, callback)) { |
| free(line); |
| return false; |
| } |
| } |
| } |
| } |
| |
| static inline const char* FindNthToken(const char* line, |
| size_t n, |
| size_t size) { |
| size_t tokens = 0; |
| bool parsing_token = false; |
| for (size_t i = 0; i < size; ++i) { |
| if (!parsing_token && line[i] != ' ') { |
| parsing_token = true; |
| if (tokens++ == n) |
| return line + static_cast<ssize_t>(i); |
| } |
| if (line[i] == ' ') |
| parsing_token = false; |
| } |
| return nullptr; |
| } |
| |
| template <typename T> |
| static bool ParseSmapsLine(char* line, |
| size_t size, |
| SmapsParserState* state, |
| T callback) { |
| char* first_token_end = static_cast<char*>(memchr(line, ' ', size)); |
| if (first_token_end == nullptr || first_token_end == line) |
| return false; // Malformed. |
| bool is_header = *(first_token_end - 1) != ':'; |
| |
| if (is_header) { |
| if (state->parsed_header) |
| callback(state->current_entry); |
| |
| state->current_entry = {}; |
| const char* last_token_begin = FindNthToken(line, 5u, size); |
| if (last_token_begin) |
| state->current_entry.pathname.assign(last_token_begin); |
| state->parsed_header = true; |
| return true; |
| } |
| if (!state->parsed_header) |
| return false; |
| |
| sscanf(line, "Size: %" PRId64 " kB", &state->current_entry.size_kb); |
| sscanf(line, "Swap: %" PRId64 " kB", &state->current_entry.swap_kb); |
| sscanf(line, "Private_Dirty: %" PRId64 " kB", |
| &state->current_entry.private_dirty_kb); |
| return true; |
| } |
| |
| } // namespace profiling |
| } // namespace perfetto |
| |
| #endif // INCLUDE_PERFETTO_PROFILING_PARSE_SMAPS_H_ |