catala/compiler/index.mld
2022-01-21 20:16:07 +01:00

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