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Copyright 2008 (c) Frederic Weisbecker <fweisbec@gmail.com>
Licensed under the terms of the GNU GPL License version 2

This script parses a trace provided by the function tracer in
kernel/trace/trace_functions.c
The resulted trace is processed into a tree to produce a more human
view of the call stack by drawing textual but hierarchical tree of
calls. Only the functions's names and the the call time are provided.

Usage:
	Be sure that you have CONFIG_FUNCTION_TRACER
	# mount -t debugfs nodev /sys/kernel/debug
	# echo function > /sys/kernel/debug/tracing/current_tracer
	$ cat /sys/kernel/debug/tracing/trace_pipe > ~/raw_trace_func
	Wait some times but not too much, the script is a bit slow.
	Break the pipe (Ctrl + Z)
	$ scripts/draw_functrace.py < raw_trace_func > draw_functrace
	Then you have your drawn trace in draw_functrace
iÿÿÿÿNtCallTreecBsGeZdZdZddd„Zd„Zd„Zd„Zd„Z	RS(sÕ This class provides a tree representation of the functions
		call stack. If a function has no parent in the kernel (interrupt,
		syscall, kernel thread...) then it is attached to a virtual parent
		called ROOT.
	cCsC||_||_|dkr-tj|_n	||_g|_dS(N(t_funct_timetNoneRtROOTt_parentt	_children(tselftfuncttimetparent((sM/usr/src/kernels/3.10.0-957.21.3.el7.x86_64/scripts/tracing/draw_functrace.pyt__init__#s			cCs&t|||ƒ}|jj|ƒ|S(s¦ If a function calls another one, call this method to insert it
			into the tree at the appropriate place.
			@return: A reference to the newly created child node.
		(RRtappend(RRtcalltimetchild((sM/usr/src/kernels/3.10.0-957.21.3.el7.x86_64/scripts/tracing/draw_functrace.pytcalls,scCs`|}x+|tjkr3|j|kr3|j}q	W|tjkr\tjj|dƒ}|S|S(sÇ Retrieve the last parent of the current node that
			has the name given by func. If this function is not
			on a parent, then create it as new child of root
			@return: A reference to the parent.
		N(RRRRRR(RRttreeR((sM/usr/src/kernels/3.10.0-957.21.3.el7.x86_64/scripts/tracing/draw_functrace.pyt	getParent5s!
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s	%s----%s
iiÿÿÿÿt is%ss    |(RRRtlenRRtFalseR(Rtbrancht	lastChildtsti((sM/usr/src/kernels/3.10.0-957.21.3.el7.x86_64/scripts/tracing/draw_functrace.pyt
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t__name__t
__module__t__doc__RRRRRRR(((sM/usr/src/kernels/3.10.0-957.21.3.el7.x86_64/scripts/tracing/draw_functrace.pyRs					tBrokenLineExceptioncBseZdZRS(syIf the last line is not complete because of the pipe breakage,
	   we want to stop the processing and ignore this line.
	(RRR (((sM/usr/src/kernels/3.10.0-957.21.3.el7.x86_64/scripts/tracing/draw_functrace.pyR!YstCommentLineExceptioncBseZdZRS(sY If the line is a comment (as in the beginning of the trace file),
	    just ignore it.
	(RRR (((sM/usr/src/kernels/3.10.0-957.21.3.el7.x86_64/scripts/tracing/draw_functrace.pyR"_scCss|jƒ}|jdƒr$t‚ntjd|ƒ}|dkrKt‚n|jdƒ|jdƒ|jdƒfS(Nt#s"[^]]+?\] +([0-9.]+): (\w+) <-(\w+)iii(tstript
startswithR"tretmatchRR!tgroup(tlinetm((sM/usr/src/kernels/3.10.0-957.21.3.el7.x86_64/scripts/tracing/draw_functrace.pyt	parseLinefs		cCs tdddƒt_tj}xstjD]h}yt|ƒ\}}}Wn%tk
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rnq(nX|j|ƒ}|j	||ƒ}q(WtjGHdS(NsRoot (Nowhere)(
RRRtsyststdinR+R!R"RR(RR)R
tcalleetcaller((sM/usr/src/kernels/3.10.0-957.21.3.el7.x86_64/scripts/tracing/draw_functrace.pytmainps	

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