dceb1c097c
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@31933 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
101 lines
3.6 KiB
TeX
101 lines
3.6 KiB
TeX
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%% Name: stackwalker.tex
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%% Purpose: wxStackWalker documentation
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%% Author: Vadim Zeitlin
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%% Created: 2005-01-19
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%% RCS-ID: $Id$
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%% Copyright: (c) 2005 Vadim Zeitlin
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%% License: wxWidgets license
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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\section{\class{wxStackWalker}}\label{wxstackwalker}
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wxStackWalker allows an application to enumerate, or walk, the stack frames (the function callstack).
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It is mostly useful in only two situations:
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inside \helpref{wxApp::OnFatalException}{wxapponfatalexception} function to
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programmatically get the location of the crash and, in debug builds, in
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\helpref{wxApp::OnAssert}{wxapponassert} to report the caller of the failed
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assert.
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wxStackWalker works by repeatedly calling
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the \helpref{OnStackFrame}{wxstackwalkeronstackframe} method for each frame in the
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stack, so to use it you must derive your own class from it and override this
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method.
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This class will not return anything except raw stack frame addresses if the
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debug information is not available. Under Win32 this means that the PDB file
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matching the program being executed should be present. Note that if you use
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Microsoft Visual C++ compiler, you can create PDB files even for the programs
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built in release mode and it doesn't affect the program size (at least if you
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don't forget to add \texttt{/opt:ref} option which is suppressed by using
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\texttt{/debug} linker option by default but should be always enabled for
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release builds). Under Unix, you need to compile your program with debugging
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information (usually using \texttt{-g} compiler and linker options) to get the
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file and line numbers information, however function names should be available
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even without it. Of course, all this is only true if you build using a recent
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enough version of GNU libc which provides the \texttt{backtrace()} function
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needed to walk the stack.
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\helpref{debugging overview}{debuggingoverview} for how to make it available.
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\wxheading{Derived from}
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No base class
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\wxheading{Include files}
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<wx/stackwalk.h>
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Only available if \texttt{wxUSE\_STACKWALKER} is $1$, currently only
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implemented for Win32 and Unix versions using recent version of GNU libc.
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\wxheading{See also}
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\helpref{wxStackFrame}{wxstackframe}
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\latexignore{\rtfignore{\wxheading{Members}}}
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\membersection{wxStackWalker::wxStackWalker}\label{wxstackwalkerwxstackwalker}
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\func{}{wxStackWalker}{\void}
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Constructor does nothing, use \helpref{Walk()}{wxstackwalkerwalk} to walk the
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stack.
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\membersection{wxStackWalker::\destruct{wxStackWalker}}\label{wxstackwalkerdtor}
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\func{}{\destruct{wxStackWalker}}{\void}
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Destructor does nothing neither but should be virtual as this class is used as
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a base one.
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\membersection{wxStackWalker::OnStackFrame}\label{wxstackwalkeronstackframe}
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\func{void}{OnStackFrame}{\param{const wxStackFrame\& }{frame}}
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This function must be overrided to process the given frame.
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\membersection{wxStackWalker::Walk}\label{wxstackwalkerwalk}
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\func{void}{Walk}{\param{size\_t }{skip = 1}}
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Enumerate stack frames from the current location, skipping the initial
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number of them (this can be useful when Walk() is called from some known
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location and you don't want to see the first few frames anyhow; also
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notice that Walk() frame itself is not included if skip $\ge 1$).
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\membersection{wxStackWalker::WalkFromException}\label{wxstackwalkerwalkfromexception}
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\func{void}{WalkFromException}{\void}
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Enumerate stack frames from the location of uncaught exception.
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This method can only be called from
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\helpref{wxApp::OnFatalException()}{wxapponfatalexception}.
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