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9d462a7b69
When we crash, emit a message straight away that says we're working on a backtrace. If starting the backtracer fails, report that also. Finally, add a duration to the messages output by the backtracer, so that we can see how long it took. rdar://118055527
75 lines
1.8 KiB
C++
75 lines
1.8 KiB
C++
//===--- BacktraceUtils.cpp - Private backtracing utilities -----*- 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 - 2017 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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// Defines some async-signal-safe formatting functions.
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//
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//===----------------------------------------------------------------------===//
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#include "BacktracePrivate.h"
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namespace swift {
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namespace runtime {
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namespace backtracing {
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// We can't call sprintf() here because we're in a signal handler,
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// so we need to be async-signal-safe.
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SWIFT_RUNTIME_STDLIB_INTERNAL void
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_swift_formatAddress(uintptr_t addr, char buffer[18])
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{
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char *ptr = buffer + 18;
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*--ptr = '\0';
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while (ptr > buffer) {
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char digit = '0' + (addr & 0xf);
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if (digit > '9')
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digit += 'a' - '0' - 10;
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*--ptr = digit;
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addr >>= 4;
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if (!addr)
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break;
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}
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// Left-justify in the buffer
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if (ptr > buffer) {
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char *pt2 = buffer;
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while (*ptr)
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*pt2++ = *ptr++;
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*pt2++ = '\0';
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}
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}
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// See above; we can't use sprintf() here.
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SWIFT_RUNTIME_STDLIB_INTERNAL void
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_swift_formatUnsigned(unsigned u, char buffer[22])
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{
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char *ptr = buffer + 22;
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*--ptr = '\0';
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while (ptr > buffer) {
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char digit = '0' + (u % 10);
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*--ptr = digit;
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u /= 10;
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if (!u)
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break;
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}
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// Left-justify in the buffer
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if (ptr > buffer) {
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char *pt2 = buffer;
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while (*ptr)
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*pt2++ = *ptr++;
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*pt2++ = '\0';
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}
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}
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} // namespace backtracing
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} // namespace runtime
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} // namespace swift
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