NAME¶

crangler - C source transformation

SYNOPSIS¶

crangler [-?] [-h] [--help]

crangler file.json

DESCRIPTION¶

crangler is a command-line utility that makes changes to a preprocessed C file that are prescribed in a JSON configuration file.

The supported transformations are:

Add a contract (pre/post/assigns) to a named C function.

Add a loop contract to a loop identified by the name of the function containing the loop and a loop number.

Remove the static storage classifier from a function or a variable.

Replace a function call by a call to a stub.

The resulting source file is written to standard output or to a file specified in the JSON configuration.

EXAMPLE¶

The following JSON configuration file makes crangler preprocess remove_static1.c. While processing this file to produce a preprocessed result, no non-standard include paths or defines reqired. Transformations configured here are removing the static storage classifier from all functions matching the regular expression foobar[12], and replacing calls to bar by calls to a function called bar_stub. No objects are listed that require transformation. The result is written to standard output.

{


  "sources": [


    "remove_static1.c"


  ],


  "includes": [],


  "defines": [],


  "functions": [


    {


      "foobar[12]": [


        "remove static"


      ],


      "bar": [


        "stub bar_stub"


      ]


    }


  ],


  "objects": [],


  "output": "stdout"
}

ENVIRONMENT¶

All tools honor the TMPDIR environment variable when generating temporary files and directories.

BUGS¶

If you encounter a problem please create an issue at https://github.com/diffblue/cbmc/issues

COPYRIGHT¶

2021, Daniel Kroening