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80 lines
2.3 KiB
ReStructuredText
80 lines
2.3 KiB
ReStructuredText
Auxiliary libraries
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===================
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The Yosys source distribution contains some auxiliary libraries that are
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compiled into Yosys and can be used in plugins.
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BigInt
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------
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The files in ``libs/bigint/`` provide a library for performing arithmetic with
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arbitrary length integers. It is written by Matt McCutchen.
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The BigInt library is used for evaluating constant expressions, e.g. using the
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ConstEval class provided in kernel/consteval.h.
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See also: http://mattmccutchen.net/bigint/
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dlfcn-win32
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-----------
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The ``dlfcn`` library enables runtime loading of plugins without requiring
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recompilation of Yosys. The files in ``libs/dlfcn-win32`` provide an
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implementation of ``dlfcn`` for Windows.
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See also: https://github.com/dlfcn-win32/dlfcn-win32
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ezSAT
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-----
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The files in ``libs/ezsat`` provide a library for simplifying generating CNF
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formulas for SAT solvers. It also contains bindings of MiniSAT. The ezSAT
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library is written by C. Wolf. It is used by the `sat` pass.
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fst
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---
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``libfst`` files from `gtkwave`_ are included in ``libs/fst`` to support
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reading/writing signal traces from/to the GTKWave developed FST format. This is
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primarily used in the `sim` command.
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.. _gtkwave: https://github.com/gtkwave/gtkwave
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json11
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------
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For reading/writing designs from/to JSON, `read_json` and
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`write_json` should be used. For everything else there is the `json11
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library`_:
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json11 is a tiny JSON library for C++11, providing JSON parsing and
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serialization.
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This library is used for outputting machine-readable statistics (`stat`
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with ``-json`` flag), using the RPC frontend (`connect_rpc`), and the
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yosys-witness ``yw`` format.
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.. _json11 library: https://github.com/dropbox/json11
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MiniSAT
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-------
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The files in ``libs/minisat`` provide a high-performance SAT solver, used by the
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`sat` command.
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SHA1
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----
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The files in ``libs/sha1/`` provide a public domain SHA1 implementation written
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by Steve Reid, Bruce Guenter, and Volker Grabsch. It is used for generating
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unique names when specializing parameterized modules.
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.. _sec:SubCircuit:
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SubCircuit
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----------
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The files in ``libs/subcircuit`` provide a library for solving the subcircuit
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isomorphism problem. It is written by C. Wolf and based on the Ullmann Subgraph
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Isomorphism Algorithm :cite:p:`UllmannSubgraphIsomorphism`. It is used by the
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`extract` pass.
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