1 /* 2 * Copyright (C) 2019 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include "src/trace_processor/fuchsia_trace_utils.h" 18 19 namespace perfetto { 20 namespace trace_processor { 21 namespace fuchsia_trace_utils { 22 23 namespace { 24 constexpr uint32_t kInlineStringMarker = 0x8000; 25 constexpr uint32_t kInlineStringLengthMask = 0x7FFF; 26 } // namespace 27 28 bool IsInlineString(uint32_t string_ref) { 29 // Treat a string ref of 0 (the empty string) as inline. The empty string is 30 // not a true entry in the string table. 31 return (string_ref & kInlineStringMarker) || (string_ref == 0); 32 } 33 34 base::StringView ReadInlineString(const uint64_t** current_ptr, 35 uint32_t string_ref) { 36 // Note that this works correctly for the empty string, where string_ref is 0. 37 size_t len = string_ref & kInlineStringLengthMask; 38 size_t len_words = (len + 7) / 8; 39 base::StringView s(reinterpret_cast<const char*>(*current_ptr), len); 40 *current_ptr += len_words; 41 return s; 42 } 43 44 bool IsInlineThread(uint32_t thread_ref) { 45 return thread_ref == 0; 46 } 47 48 ThreadInfo ReadInlineThread(const uint64_t** current_ptr) { 49 ThreadInfo ret; 50 ret.pid = **current_ptr; 51 (*current_ptr)++; 52 ret.tid = **current_ptr; 53 (*current_ptr)++; 54 return ret; 55 } 56 57 int64_t ReadTimestamp(const uint64_t** current_ptr, uint64_t ticks_per_second) { 58 uint64_t ticks = **current_ptr; 59 (*current_ptr)++; 60 return TicksToNs(ticks, ticks_per_second); 61 } 62 63 int64_t TicksToNs(uint64_t ticks, uint64_t ticks_per_second) { 64 return static_cast<int64_t>(ticks * uint64_t(1000000000) / ticks_per_second); 65 } 66 67 } // namespace fuchsia_trace_utils 68 } // namespace trace_processor 69 } // namespace perfetto 70
