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110f428780
Section scans (for metadata, protocols, etc.) can be costly. This change adds tracing calls to those scans so we can more easily see how much time is spent in these scans and where they're initiated. This adds an os_signpost implementation controlled by SWIFT_STDLIB_TRACING, and a default empty implementation for when that's disabled. rdar://110266743
40 lines
1.1 KiB
C++
40 lines
1.1 KiB
C++
//===--- Tracing.cpp - Support code for runtime tracing ------------*- C++ -*-//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2021 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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// Support code for tracing events in the Swift runtime
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//
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//===----------------------------------------------------------------------===//
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#include "Tracing.h"
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#if SWIFT_STDLIB_TRACING
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#define SWIFT_LOG_SUBSYSTEM "com.apple.swift"
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#define SWIFT_LOG_SECTION_SCAN_CATEGORY "SectionScan"
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namespace swift {
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namespace runtime {
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namespace trace {
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os_log_t ScanLog;
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swift::once_t LogsToken;
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void setupLogs(void *unused) {
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ScanLog = os_log_create(SWIFT_LOG_SUBSYSTEM, SWIFT_LOG_SECTION_SCAN_CATEGORY);
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}
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} // namespace trace
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} // namespace runtime
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} // namespace swift
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#endif
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