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Show Callgraph from cscope database

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.. sectnum::
.. contents:: Table Of Contents

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calltree
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Show Callgraph of a given function

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Purpose
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The understanding of the codeflow in a larger source of codebase, requires to list the caller and callee relationships for a given function. For linux and unix developers, cscope has been the primary utitlity to search and browse through the code.

This utility uses the generated cscope database to list and display the
callgraph, which is stored in a image format.

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Usage
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Command Line
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Usage: python -m calltree [options] functionname

Options:
--version show program's version number and exit
-h, --help show this help message and exit
--everything Recursively show all callers and callees
-a, --showall Show all callers and callees
-c, --callers Recursively show all callers
-e, --callees Recursively show all callees
-l LEVEL, --level=LEVEL
Show Level of callers/callees
-f OUTPUTFORMAT, --format=OUTPUTFORMAT
output format jpg/png
-o OUTPUTDIR, --outputdir=OUTPUTDIR
Storage directory for output files
-d SOURCEDB, --db=SOURCEDB
cscope database (cscope.out)

.. code-block::
import calltree
f = calltree.calltree.calltree()
f.showtree()
f.showgraph()

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