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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
86 lines
2.9 KiB
C++
86 lines
2.9 KiB
C++
//===--- Backtrace.cpp - Swift crash catching and backtracing support ---- ===//
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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) 2022 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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// Definitions relating to backtracing.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_RUNTIME_BACKTRACE_H
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#define SWIFT_RUNTIME_BACKTRACE_H
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#ifdef __linux__
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <signal.h>
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#endif // defined(__linux__)
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#include "swift/Runtime/Config.h"
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#include "swift/Runtime/CrashInfo.h"
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#include "swift/shims/Visibility.h"
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#include <inttypes.h>
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#ifdef __cplusplus
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namespace swift {
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namespace runtime {
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namespace backtrace {
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#endif
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// Test if a given function is a Swift thunk of some sort.
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//
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// @param mangledName is the name of the symbol to test.
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//
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// @returns true if the function is a thunk.
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SWIFT_RUNTIME_STDLIB_SPI
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bool _swift_backtrace_isThunkFunction(const char *mangledName);
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/// Try to demangle a symbol.
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///
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/// Unlike other entry points that do this, we try both Swift and C++ here.
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///
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/// @param mangledName is the symbol name to be demangled.
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/// @param mangledNameLength is the length of this name.
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/// @param outputBuffer is a pointer to a buffer in which to place the result.
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/// @param outputBufferSize points to a variable that contains the size of the
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/// output buffer.
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///
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/// If outputBuffer is nullptr, the function will allocate memory for the
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/// result using malloc(). In this case, outputBufferSize may be nullptr;
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/// if it is *not* nullptr, it will be set to the size of buffer that was
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/// allocated. This is not necessarily the length of the string (it may be
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/// somewhat higher).
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///
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/// Otherwise, the result will be written into the output buffer, and the
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/// size of the result will be written into outputBufferSize. If the buffer
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/// is too small, the result will be truncated, but outputBufferSize will
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/// still be set to the number of bytes that would have been required to
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/// copy out the full result (including a trailing NUL).
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///
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/// The unusual behaviour here is a consequence of the way the C++ ABI's
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/// demangling function works.
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///
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/// @returns a pointer to the output if demangling was successful.
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SWIFT_RUNTIME_STDLIB_SPI
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char *_swift_backtrace_demangle(const char *mangledName,
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size_t mangledNameLength,
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char *outputBuffer,
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size_t *outputBufferSize);
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#ifdef __cplusplus
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} // namespace backtrace
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} // namespace runtime
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} // namespace swift
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#endif
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#endif // SWIFT_RUNTIME_BACKTRACE_H
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