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bug#25679: 26.0.50; Emacs hangs for nested generics

From: Philipp Stephani
Subject: bug#25679: 26.0.50; Emacs hangs for nested generics
Date: Fri, 10 Feb 2017 20:27:27 +0100

Create a file /tmp/Foo.java with the following content:

class Foo {
    void func(A<B<C>>> a, A<B<C>>> b, A<B<C>>> c, A<B<C>>> d, A<B<C>>> e, 
A<B<C>>> f, A<B<C>>> g, A<B<C>>> h, A<B<C>>> i, A<B<C>>> j, A<B<C>>> k) {}

Then open that file:

emacs -Q /tmp/Foo.java

Emacs hangs.  C-g also doesn't work.  GDB shows the culprit is a
recursive invocation of

"c-forward-<>-arglist-recur" (0x29dd1f00)
"c-forward-<>-arglist" (0x29dd2530)
"c-forward-name" (0x29dd2d40)
"c-forward-type" (0x29dd3750)

The actual top of the stack is often GC or a regex match.
Seems the parsing of generic arguments has some exponential behavior.
This is a regression since 24.3, where editing such files has no
noticeable delay.

In GNU Emacs (x86_64-unknown-linux-gnu, GTK+ Version 3.10.8)
 of 2017-02-10 built on localhost
Repository revision: abcba32c262e575b562ec0e481e55538536f969f
Windowing system distributor 'The X.Org Foundation', version 11.0.11501000
System Description:     Ubuntu 14.04 LTS

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.

Configured using:
 'configure --with-modules 'CFLAGS=-O0 -ggdb3' --enable-checking

Configured features:

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

(shadow sort mail-extr emacsbug message subr-x puny seq byte-opt gv
bytecomp byte-compile cl-extra help-mode cconv cl-loaddefs pcase cl-lib
dired dired-loaddefs format-spec rfc822 mml easymenu mml-sec
password-cache epa derived epg epg-config gnus-util rmail rmail-loaddefs
mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils
mailheader sendmail rfc2047 rfc2045 ietf-drums mm-util mail-prsvr
mail-utils time-date mule-util tooltip eldoc electric uniquify
ediff-hook vc-hooks lisp-float-type mwheel term/x-win x-win
term/common-win x-dnd tool-bar dnd fontset image regexp-opt fringe
tabulated-list replace newcomment text-mode elisp-mode lisp-mode
prog-mode register page menu-bar rfn-eshadow isearch timer select
scroll-bar mouse jit-lock font-lock syntax facemenu font-core
term/tty-colors frame cl-generic cham georgian utf-8-lang misc-lang
vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms cp51932
hebrew greek romanian slovak czech european ethiopic indian cyrillic
chinese composite charscript case-table epa-hook jka-cmpr-hook help
simple abbrev obarray minibuffer cl-preloaded nadvice loaddefs button
faces cus-face macroexp files text-properties overlay sha1 md5 base64
format env code-pages mule custom widget hashtable-print-readable
backquote inotify dynamic-setting system-font-setting
font-render-setting move-toolbar gtk x-toolkit x multi-tty
make-network-process emacs)

Memory information:
((conses 16 97870 8481)
 (symbols 48 20263 1)
 (miscs 40 331 131)
 (strings 32 18056 4481)
 (string-bytes 1 593648)
 (vectors 16 14075)
 (vector-slots 8 472899 6583)
 (floats 8 182 52)
 (intervals 56 218 0)
 (buffers 976 12)
 (heap 1024 32557 1028))

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