1 files changed, 69 insertions, 0 deletions
diff --git a/compiler/Errors.ml b/compiler/Errors.ml
new file mode 100644
index 00000000..53e56c44
--- /dev/null
+++ b/compiler/Errors.ml
@@ -0,0 +1,69 @@
+let log = Logging.errors_log
+
+let meta_to_string (span : Meta.span) =
+  let file = match span.file with Virtual s | Local s -> s in
+  let loc_to_string (l : Meta.loc) : string =
+    string_of_int l.line ^ ":" ^ string_of_int l.col
+  in
+  "Source: '" ^ file ^ "', lines " ^ loc_to_string span.beg_loc ^ "-"
+  ^ loc_to_string span.end_loc
+
+let format_error_message (meta : Meta.meta option) (msg : string) =
+  let meta =
+    match meta with None -> "" | Some meta -> "\n" ^ meta_to_string meta.span
+  in
+  msg ^ meta
+
+let format_error_message_with_file_line (file : string) (line : int)
+    (meta : Meta.meta option) (msg : string) =
+  "In file " ^ file ^ ", line " ^ string_of_int line ^ ":\n"
+  ^ format_error_message meta msg
+
+exception CFailure of (Meta.meta option * string)
+
+let error_list : (Meta.meta option * string) list ref = ref []
+
+let push_error (meta : Meta.meta option) (msg : string) =
+  error_list := (meta, msg) :: !error_list
+
+(** Register an error, and throw an exception if [throw] is true *)
+let save_error (file : string) (line : int) ?(throw : bool = false)
+    (meta : Meta.meta option) (msg : string) =
+  push_error meta msg;
+  if !Config.fail_hard && throw then (
+    let msg = format_error_message_with_file_line file line meta msg in
+    log#serror (msg ^ "\n");
+    raise (Failure msg))
+
+let craise_opt_meta (file : string) (line : int) (meta : Meta.meta option)
+    (msg : string) =
+  if !Config.fail_hard then (
+    let msg = format_error_message_with_file_line file line meta msg in
+    log#serror (msg ^ "\n");
+    raise (Failure (format_error_message_with_file_line file line meta msg)))
+  else
+    let () = push_error meta msg in
+    raise (CFailure (meta, msg))
+
+let craise (file : string) (line : int) (meta : Meta.meta) (msg : string) =
+  craise_opt_meta file line (Some meta) msg
+
+let cassert_opt_meta (file : string) (line : int) (b : bool)
+    (meta : Meta.meta option) (msg : string) =
+  if not b then craise_opt_meta file line meta msg
+
+let cassert (file : string) (line : int) (b : bool) (meta : Meta.meta)
+    (msg : string) =
+  cassert_opt_meta file line b (Some meta) msg
+
+let sanity_check (file : string) (line : int) b meta =
+  cassert file line b meta "Internal error, please file an issue"
+
+let sanity_check_opt_meta (file : string) (line : int) b meta =
+  cassert_opt_meta file line b meta "Internal error, please file an issue"
+
+let internal_error (file : string) (line : int) meta =
+  craise file line meta "Internal error, please file an issue"
+
+let exec_raise = craise
+let exec_assert = cassert