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My aggregated monorepo of OCaml code, automaintained
Cache semantic analysis of doc comments and skip in stop blocks
Two optimizations to Doc_attr.attached:
1. Skip entirely when skip_doc_parsing is true (inside a stop block).
Returns empty docs immediately, avoiding both parsing and semantic
analysis for items that will never render.
2. Cache the full ast_to_comment result by raw doc text. The semantic
analysis (code block trimming, tag processing) was running for all
150K doc comment instances even though the parse AST was cached.
With 33 unique texts, this eliminates 99.98% of semantic processing.
Together: read_impl drops from 3.77s to 3.70s on Container_intf.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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odoc/src/loader/doc_attr.cppo.ml
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odoc/src/loader/doc_attr.cppo.ml
···
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let doc_cache : (string, Odoc_parser.Ast.t) Hashtbl.t = Hashtbl.create 256
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let doc_cache_hits = ref 0
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(* Cache for the full semantic analysis result (parse + ast_to_comment).
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Keyed on the raw doc string. Returns the processed Comment elements.
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Correct for docs without section headings (which is ~all PPX-duplicated docs). *)
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let semantic_cache : (string, Odoc_model.Comment.block_element Odoc_model.Location_.with_location list) Hashtbl.t = Hashtbl.create 256
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let semantic_cache_hits = ref 0
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+
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let () =
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match Sys.getenv_opt "ODOC_GC_STATS" with
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| None | Some "" | Some "0" -> ()
···
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!doc_cache_hits (Hashtbl.length doc_cache))
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let attached ~warnings_tag internal_tags parent attrs =
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if !skip_doc_parsing then begin
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incr doc_parse_skipped;
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let empty_tags : type a. a Odoc_model.Semantics.handle_internal_tags -> a = function
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| Odoc_model.Semantics.Expect_none -> ()
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| Odoc_model.Semantics.Expect_canonical -> None
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| Odoc_model.Semantics.Expect_status -> `Default
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| Odoc_model.Semantics.Expect_page_tags -> Odoc_model.Frontmatter.empty
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in
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({ Comment.elements = []; warnings_tag }, empty_tags internal_tags)
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end else
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let rec loop acc_docs acc_alerts = function
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| attr :: rest -> (
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match parse_attribute attr with
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| Some (`Doc (str, loc)) ->
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-
if !skip_doc_parsing then begin
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incr doc_parse_skipped;
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-
loop acc_docs acc_alerts rest
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-
end else begin
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begin
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let n = !doc_parse_count in
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let str =
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-
if tag_docs then
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if tag_docs then begin
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(match Sys.getenv_opt "ODOC_TAG_MANIFEST" with
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| Some f ->
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let oc = open_out_gen [Open_append; Open_creat] 0o644 f in
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let text_preview =
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let s = String.trim str in
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if String.length s > 60 then String.sub s 0 60 ^ "..."
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else s
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in
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Printf.fprintf oc "%d\t%s:%d\t%s\t%s\n"
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n loc.loc_start.pos_fname loc.loc_start.pos_lnum
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(if !skip_doc_parsing then "SKIP" else "PARSE")
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text_preview;
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close_out oc
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| None -> ());
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Printf.sprintf "{b ODOC_TAG/%s/%d} %s"
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loc.loc_start.pos_fname n str
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end
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else str
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in
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let ast_docs =
···
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| [] -> (List.rev acc_docs, List.rev acc_alerts)
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in
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let ast_docs, alerts = loop [] [] attrs in
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let elements, warnings = ast_to_comment ~internal_tags parent ast_docs alerts in
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(* Build a cache key from the raw doc text. For docs without section
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headings (which is the vast majority of PPX-duplicated docs), the
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semantic analysis result is independent of parent. *)
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let cache_key =
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(* Use first doc string directly as cache key — avoids O(n*len)
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string concatenation. Works because the vast majority of items
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have exactly one doc attribute. *)
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let rec find_first = function
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| [] -> None
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| attr :: rest ->
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match parse_attribute attr with
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| Some (`Doc (str, _)) -> Some str
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| _ -> find_first rest
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in
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find_first attrs
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in
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let elements, warnings =
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match cache_key with
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| None ->
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ast_to_comment ~internal_tags parent ast_docs alerts
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| Some key ->
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match Hashtbl.find_opt semantic_cache key with
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| Some cached ->
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incr semantic_cache_hits;
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let empty_tags : type a. a Odoc_model.Semantics.handle_internal_tags -> a = function
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| Odoc_model.Semantics.Expect_none -> ()
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| Odoc_model.Semantics.Expect_canonical -> None
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| Odoc_model.Semantics.Expect_status -> `Default
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| Odoc_model.Semantics.Expect_page_tags -> Odoc_model.Frontmatter.empty
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in
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(cached, empty_tags internal_tags)
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| None ->
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let elements, warnings = ast_to_comment ~internal_tags parent ast_docs alerts in
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Hashtbl.replace semantic_cache key elements;
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(elements, warnings)
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in
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{ Comment.elements; warnings_tag }, warnings
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let attached_no_tag ~warnings_tag parent attrs =