Support for outputting JSON version of the GOTO program#448

Merged

kroening merged 11 commits intodiffblue:masterfrom

thk123:feature/goto2json

Feb 8, 2017

Commits on Feb 8, 2017

Refactored out output_instruction so could use an instruction
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First pass implementing json output of GOTO program
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Moved the JSON printing logic into its own class.
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Only show source location if there is one
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Made show_goto_functions provide options to directly return the object
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Basic implementation for the XML class
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Added a to_string method to instructions
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Wrote an irep to JSON converter
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Added guard to the output
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Only print the operands if there are some
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Made the json and xml show functions class use operator()
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