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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/BaseAndGeckoProfilerDetail.h"
#include <limits>
#include <string_view>
namespace mozilla::profiler::detail {
constexpr std::string_view scPidPrefix = "pid:";
// Convert a C string to a BaseProfilerProcessId. Return unspecified
// BaseProfilerProcessId if the string is not exactly a valid pid.
static baseprofiler::BaseProfilerProcessId StringToPid(const char* aString) {
if (!aString || aString[0] == '\0') {
// Null or empty.
return baseprofiler::BaseProfilerProcessId{};
}
if (aString[0] == '0') {
if (aString[1] != '\0') {
// Don't accept leading zeroes.
return baseprofiler::BaseProfilerProcessId{};
}
return baseprofiler::BaseProfilerProcessId::FromNumber(0);
}
using PidNumber = baseprofiler::BaseProfilerProcessId::NumberType;
PidNumber pid = 0;
for (;;) {
const char c = *aString;
if (c == '\0') {
break;
}
if (c < '0' || c > '9') {
// Only accept decimal digits.
return baseprofiler::BaseProfilerProcessId{};
}
static_assert(!std::numeric_limits<PidNumber>::is_signed,
"The following relies on unsigned arithmetic");
PidNumber newPid = pid * 10u + PidNumber(c - '0');
if (newPid < pid) {
// Unsigned overflow.
return baseprofiler::BaseProfilerProcessId{};
}
pid = newPid;
++aString;
}
return baseprofiler::BaseProfilerProcessId::FromNumber(pid);
}
[[nodiscard]] MFBT_API bool FilterHasPid(
const char* aFilter, baseprofiler::BaseProfilerProcessId aPid) {
if (strncmp(aFilter, scPidPrefix.data(), scPidPrefix.length()) != 0) {
// The filter is not starting with "pid:".
return false;
}
return StringToPid(aFilter + scPidPrefix.length()) == aPid;
}
[[nodiscard]] MFBT_API bool FiltersExcludePid(
Span<const char* const> aFilters,
baseprofiler::BaseProfilerProcessId aPid) {
if (aFilters.empty()) {
return false;
}
// First, check if the list only contains "pid:..." strings.
for (const char* const filter : aFilters) {
if (strncmp(filter, scPidPrefix.data(), scPidPrefix.length()) != 0) {
// At least one filter is *not* a "pid:...", our pid is not excluded.
return false;
}
}
// Here, all filters start with "pid:". Check if the given pid is included.
for (const char* const filter : aFilters) {
if (StringToPid(filter + scPidPrefix.length()) == aPid) {
// Our pid is present, so it's not excluded.
return false;
}
}
// Our pid was not in a list of only pids, so it's excluded.
return true;
}
} // namespace mozilla::profiler::detail
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