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124 lines
4.9 KiB
Plaintext
124 lines
4.9 KiB
Plaintext
{0 The Catala compiler}
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{1 Architecture}
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The architecture of the Catala compiler is inspired by
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{{: https://compcert.org/} CompCert} or the {{: https://nanopass.org/} Nanopass}
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framework, and is structured around many intermediate representations connected
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by successive translations passes.
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Here is the recap picture of the different intermediate representations of the
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Catala compiler (made with an {{: https://textik.com/#c1c1fecda5209492} ASCII diagram tool}):
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{v
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+---------------+
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| Surface AST |
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+---------------+
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* Separate code from legislation |
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* Remove syntactic sugars |
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v
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+------------------+
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| Desugared AST |
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+------------------+
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* Build rule trees for each definition |
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* Order variable computations inside scope |
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v
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+--------------------+
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| Scope language AST |
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+--------------------+
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* Convert scopes into functions |
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* Thunking of subscope arguments |
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v
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+----------------------+
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| Default calculus AST |
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+----------------------+
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* Compile the default term |
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v
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+----------------------+
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| Lambda calculus AST |
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+----------------------+
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* Turn expressions into statements |
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v
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+--------------------------+
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| Statement calculus AST |
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+--------------------------+
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v}
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{1 List of top-level modules }
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Each of those intermediate representation is bundled into its own [dune] bundle
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module. Click on the items below if you want to dive straight into the signatures.
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{!modules: Surface Desugared Scopelang Dcalc Lcalc Scalc }
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More documentation can be found on each intermediate representations here.
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{ul
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{li {{: surface.html} The surface representation}}
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{li {{: desugared.html} The desugared representation}}
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{li {{: scopelang.html} The scope language }}
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{li {{: dcalc.html} The default calculus}}
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{li {{: lcalc.html} The lambda calculus}}
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{li {{: scalc.html} The statement calculus}}
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}
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Most of these intermediate representations use a {{: shared_ast.html} shared AST libary}.
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The main compilation chain is defined in {!module: Driver}.
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{!modules: Shared_ast Driver}
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Additionally, the compiler features a verification plugin that generates
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verification condition for proof backends. More information can be found here:
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{ul
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{li {{: verification.html} Verification}}
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}
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Two more modules contain additional features for the compiler:
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{ul
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{li {{: literate.html} Literate programming}}
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{li {{: catala_utils.html} Compiler utilities}}
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}
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The Catala runtimes documentation is available here:
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{!modules: Runtime_ocaml.Runtime Runtime_jsoo.Runtime}
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Last, it is possible to customize the backend to the compiler using a plugin
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mechanism. The API is defined inside the following module:
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{!module: Driver.Plugin}
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See the examples in the [plugins/] subdirectory:
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{ul
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{li {{: plugins.html} Backend plugin examples}}
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}
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