front_end.front_end_anno_cand module

class front_end.front_end_anno_cand.AnnotatedCandidates(settings)

Bases: circa.stages.front_end.front_end.FrontEnd

FrontEnd subclass that reads candidate information from annotations in the original design file.

Candidates in the Verilog design are annotated with a key word and optional approximation settings that are placed between the module keyword and the module name. The annotation keyword can be set in the configuration file. Default is ANNOTATION_KEYWORD = r'<<<APPROX_CAND>>>'.

Raises:ValueError – If there is no Key keyword in the settings dict, i.e. in the configuration file.

class ANNOTATION_REGEX_GROUP

Bases: object

Regex group names used to find and parse annotations.

ENTIRE_MATCH = 'gEntireMatch'

APPROX_KEY = 'gApproxKey'

APPROX_PARAMETERS = 'gApproxParameters'

MODULE_NAME = 'gModuleName'

MODULE_PORTS = 'gModulePorts'

setup(cfg_file, input_file)

Sets up the FrontEnd instance using config and input files. Provides default implementation.

Parameters:

• cfg_file (str) – The absolute path to the configuration file in *.cfg format.
• input_file (str) – The absolute path to the input circuit file in Verilog format.

Raises:

ValueError – If cfg_file or input_file is invalid, i.e. None or empty.

process()

Returns a GeneralInformation instance: Must generate a CandidateSet, VariantSet and ApproximatedCircuits, set paths and create directories. Must also create Verilog and Blif format files of the original circuit.

Parameters to set in GeneralInformation object:

top_module pis pos cand_set variant_set approx_circuits base_directory (optional, default is input file path) output_dir (optional, default is input file path)

_extractAnnotationsAndCleanDesign()

Parses the input file and searches for annotations in the code. Puts every annotation found into comments and stores the cleaned design. A key word is used to recognize annotations. The key is set in the config.

Returns:A list containing a dictionary for each annotation found in the input design file. Every dictionary has all keys specified in ANNOTATION_REGEX_GROUP. Return type:list of dict Raises:RuntimeError – If no annotations were found in the input circuit file.

_generateCandidates(cand_set)

Uses annotations to extract candidate information, instantiates Candidate objects and stores them in the CandidateSet.

Parameters:cand_set (CandidateSet) – CandidateSet instance in which the Candidates are stored.