diff options
Diffstat (limited to 'src/value.ml')
| -rw-r--r-- | src/value.ml | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/value.ml b/src/value.ml index 157c16fc..589e956a 100644 --- a/src/value.ml +++ b/src/value.ml @@ -86,6 +86,12 @@ type value = | V_ref of string | V_ctor of string * value list | V_record of value StringMap.t + (* When constant folding we disable reading registers, so a register + read will return a V_attempted_read value. If we try to do + anything with this value, we'll get an exception - but if all we + do is return it then we can replace the expression we are folding + with a direct register read. *) + | V_attempted_read of string let rec eq_value v1 v2 = match v1, v2 with @@ -386,6 +392,7 @@ let rec string_of_value = function | V_ctor (str, vals) -> str ^ "(" ^ Util.string_of_list ", " string_of_value vals ^ ")" | V_record record -> "{" ^ Util.string_of_list ", " (fun (field, v) -> field ^ "=" ^ string_of_value v) (StringMap.bindings record) ^ "}" + | V_attempted_read _ -> assert false let value_sign_extend = function | [v1; v2] -> mk_vector (Sail_lib.sign_extend (coerce_bv v1, coerce_int v2)) |