blob: f6254a12e6559b54e5bd1f303c50484305a41c66 [file] [log] [blame]
/*
* Copyright (C) 2018 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.
*/
#include "tools/trace_to_text/utils.h"
#include <inttypes.h>
#include <stdio.h>
#include <memory>
#include <ostream>
#include <utility>
#include "perfetto/base/logging.h"
#include "perfetto/ext/base/string_splitter.h"
#include "perfetto/ext/traced/sys_stats_counters.h"
#include "protos/perfetto/trace/ftrace/ftrace_stats.pb.h"
#include "protos/perfetto/trace/trace.pb.h"
#include "protos/perfetto/trace/trace_packet.pb.h"
namespace perfetto {
namespace trace_to_text {
void ForEachPacketBlobInTrace(
std::istream* input,
const std::function<void(std::unique_ptr<char[]>, size_t)>& f) {
size_t bytes_processed = 0;
// The trace stream can be very large. We cannot just pass it in one go to
// libprotobuf as that will refuse to parse messages > 64MB. However we know
// that a trace is merely a sequence of TracePackets. Here we just manually
// tokenize the repeated TracePacket messages and parse them individually
// using libprotobuf.
for (uint32_t i = 0;; i++) {
if ((i & 0x3f) == 0) {
fprintf(stderr, "Processing trace: %8zu KB%c", bytes_processed / 1024,
kProgressChar);
fflush(stderr);
}
// A TracePacket consists in one byte stating its field id and type ...
char preamble;
input->get(preamble);
if (!input->good())
break;
bytes_processed++;
PERFETTO_DCHECK(preamble == 0x0a); // Field ID:1, type:length delimited.
// ... a varint stating its size ...
uint32_t field_size = 0;
uint32_t shift = 0;
for (;;) {
char c = 0;
input->get(c);
field_size |= static_cast<uint32_t>(c & 0x7f) << shift;
shift += 7;
bytes_processed++;
if (!(c & 0x80))
break;
}
// ... and the actual TracePacket itself.
std::unique_ptr<char[]> buf(new char[field_size]);
input->read(buf.get(), static_cast<std::streamsize>(field_size));
bytes_processed += field_size;
f(std::move(buf), field_size);
}
}
void ForEachPacketInTrace(
std::istream* input,
const std::function<void(const protos::TracePacket&)>& f) {
ForEachPacketBlobInTrace(
input, [f](std::unique_ptr<char[]> buf, size_t size) {
protos::TracePacket packet;
auto res = packet.ParseFromArray(buf.get(), static_cast<int>(size));
if (!res) {
PERFETTO_ELOG("Skipping invalid packet");
return;
}
f(packet);
});
fprintf(stderr, "\n");
}
std::vector<std::string> GetPerfettoBinaryPath() {
std::vector<std::string> roots;
const char* root = getenv("PERFETTO_BINARY_PATH");
if (root != nullptr) {
for (base::StringSplitter sp(std::string(root), ':'); sp.Next();)
roots.emplace_back(sp.cur_token(), sp.cur_token_size());
}
return roots;
}
} // namespace trace_to_text
} // namespace perfetto