From d87d4ad3a6d2ec2804cb7b20128fecb6d9df4e6e Mon Sep 17 00:00:00 2001
From: Alasdair Armstrong
Date: Thu, 25 Jan 2018 00:30:24 +0000
Subject: Add simple conditional processing and file include

Can now use C-style include declarations to include files within other sail files. This is done in such a way that all the location information is preserved in error messages. As an example:

$include "aarch64/prelude.sail"
$define SYM
$ifndef SYM
$include <../util.sail>
$endif

would include the file aarch64/prelude.sail relative to the file where the include is contained. It then defines a symbol SYM and includes another file if it is not defined. The <../util.sail> include will be accessed relative to $SAIL_DIR/lib, so $SAIL_DIR/lib/../util.sail in this case.

This can be used with the standard C trick of

$ifndef ONCE
$define ONCE
val f : unit -> unit
$endif

so no matter how many sail files include the above file, the valspec for f will only appear once.

Currently we just have $include, $define, $ifdef and $ifndef (with $else and $endif). We're using $ rather than # because # is already used in internal identifiers, although this could be switched.
---
 src/parse_ast.ml | 1 +
 1 file changed, 1 insertion(+)

(limited to 'src/parse_ast.ml')

diff --git a/src/parse_ast.ml b/src/parse_ast.ml
index 362333f3..5eb8038a 100644
--- a/src/parse_ast.ml
+++ b/src/parse_ast.ml
@@ -507,6 +507,7 @@ def =  (* Top-level definition *)
  | DEF_default of default_typing_spec (* default kind and type assumptions *)
  | DEF_scattered of scattered_def (* scattered definition *)
  | DEF_reg_dec of dec_spec (* register declaration *)
+ | DEF_pragma of string * string * l
  | DEF_internal_mutrec of fundef list
 
 
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