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118 lines
4.8 KiB
C++
118 lines
4.8 KiB
C++
// -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*-
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// Copyright (c) 2005, Google Inc.
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// ---
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// Author: Sanjay Ghemawat
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//
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// Routines to extract the current stack trace. These functions are
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// thread-safe.
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#ifndef GOOGLE_STACKTRACE_H_
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#define GOOGLE_STACKTRACE_H_
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// Annoying stuff for windows -- makes sure clients can import these functions
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#ifndef PERFTOOLS_DLL_DECL
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# ifdef _WIN32
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# define PERFTOOLS_DLL_DECL __declspec(dllimport)
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# else
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# define PERFTOOLS_DLL_DECL
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# endif
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#endif
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// Skips the most recent "skip_count" stack frames (also skips the
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// frame generated for the "GetStackFrames" routine itself), and then
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// records the pc values for up to the next "max_depth" frames in
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// "result", and the corresponding stack frame sizes in "sizes".
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// Returns the number of values recorded in "result"/"sizes".
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//
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// Example:
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// main() { foo(); }
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// foo() { bar(); }
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// bar() {
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// void* result[10];
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// int sizes[10];
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// int depth = GetStackFrames(result, sizes, 10, 1);
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// }
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//
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// The GetStackFrames call will skip the frame for "bar". It will
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// return 2 and will produce pc values that map to the following
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// procedures:
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// result[0] foo
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// result[1] main
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// (Actually, there may be a few more entries after "main" to account for
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// startup procedures.)
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// And corresponding stack frame sizes will also be recorded:
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// sizes[0] 16
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// sizes[1] 16
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// (Stack frame sizes of 16 above are just for illustration purposes.)
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// Stack frame sizes of 0 or less indicate that those frame sizes couldn't
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// be identified.
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//
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// This routine may return fewer stack frame entries than are
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// available. Also note that "result" and "sizes" must both be non-NULL.
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extern PERFTOOLS_DLL_DECL int GetStackFrames(void** result, int* sizes, int max_depth,
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int skip_count);
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// Same as above, but to be used from a signal handler. The "uc" parameter
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// should be the pointer to ucontext_t which was passed as the 3rd parameter
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// to sa_sigaction signal handler. It may help the unwinder to get a
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// better stack trace under certain conditions. The "uc" may safely be NULL.
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extern PERFTOOLS_DLL_DECL int GetStackFramesWithContext(void** result, int* sizes, int max_depth,
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int skip_count, const void *uc);
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// This is similar to the GetStackFrames routine, except that it returns
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// the stack trace only, and not the stack frame sizes as well.
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// Example:
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// main() { foo(); }
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// foo() { bar(); }
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// bar() {
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// void* result[10];
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// int depth = GetStackTrace(result, 10, 1);
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// }
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//
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// This produces:
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// result[0] foo
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// result[1] main
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// .... ...
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//
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// "result" must not be NULL.
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extern PERFTOOLS_DLL_DECL int GetStackTrace(void** result, int max_depth,
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int skip_count);
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// Same as above, but to be used from a signal handler. The "uc" parameter
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// should be the pointer to ucontext_t which was passed as the 3rd parameter
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// to sa_sigaction signal handler. It may help the unwinder to get a
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// better stack trace under certain conditions. The "uc" may safely be NULL.
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extern PERFTOOLS_DLL_DECL int GetStackTraceWithContext(void** result, int max_depth,
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int skip_count, const void *uc);
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#endif /* GOOGLE_STACKTRACE_H_ */
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