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Remove print state objects, and ports-with-print-state

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The goal was that, as part of a print operation, all nested prints of
contained data would be able to use the same parameters (e.g. write or
not), and also detect cycles, highlight objects, etc.  The mechanism was
a heap-allocated data structure.  However, given that:

  1. Nobody accessed print states from Scheme

  2. `write` and `display` should move to Scheme anyway, in order to be
     suspendable

  3. The "fancyp" and "highlight" options were unused

  4. A simple stack-allocated data structure with a per-thread key could
     do the trick just as well, without needing the weird freelist
     structure

  5. Ports-with-print-states were a source of bugs

In the end we switch print states to be something completely internal to
print.c.  There are no more SCM print-state objects, and no more
ports-with-print-state.

* libguile/print.h: Remove print state from API.
* libguile/print.c (struct scm_print_state): Move definition here.
(scm_print_opts): Remove "highlight-prefix" and "highlight-suffix"
options, as they were not used.
(ENTER_NESTED_DATA): Remove "fancyp" case.
(init_print_state_key, get_print_state, push_print_state)
(maybe_push_print_state, pop_print_state): New facility to manage stack
of active print states.
(scm_iprin1, print_vector): No more fancyp.
(iprin1): Access "writingp" member directly.  Don't make ports with
print states.
(scm_prin1): Manage print state stack.
(scm_iprlist): No more fancyp.
(scm_valid_oport_value_p): Remove; valid outports are SCM_OPOUTPORTP.
* libguile/backtrace.c:
* libguile/filesys.c:
* libguile/fports.c:
* libguile/goops.c:
* libguile/ioext.c:
* libguile/ports.c:
* libguile/posix.c:
* libguile/promises.c:
* libguile/socket.c:
* libguile/struct.c: Remove cases that dealt with
ports-with-print-states.
* libguile/private-options.h: Remove highlight options.
* module/ice-9/ports.scm (inherit-print-state): Deprecate.
* libguile/deprecated.c:
* libguile/deprecated.h: Add deprecation shims for print states, as far
as that is possible.
This commit is contained in:
Andy Wingo 2025-06-17 08:33:47 +02:00
parent d1b548033c
commit 3cf4ca187c
16 changed files with 181 additions and 425 deletions
Download patch file Download diff file Expand all files Collapse all files

5
libguile/posix.c
View file

@ -1056,7 +1056,6 @@ SCM_DEFINE (scm_ttyname, "ttyname", 1, 0, 0,
"underlying @var{port}.")
#define FUNC_NAME s_scm_ttyname
{
port = SCM_COERCE_OUTPORT (port);
SCM_VALIDATE_OPPORT (1, port);
if (!SCM_FPORTP (port))
return SCM_BOOL_F;
@ -1113,8 +1112,6 @@ SCM_DEFINE (scm_tcgetpgrp, "tcgetpgrp", 1, 0, 0,
int fd;
pid_t pgid;
port = SCM_COERCE_OUTPORT (port);
SCM_VALIDATE_OPFPORT (1, port);
fd = SCM_FPORT_FDES (port);
if ((pgid = tcgetpgrp (fd)) == -1)
@ -1136,8 +1133,6 @@ SCM_DEFINE (scm_tcsetpgrp, "tcsetpgrp", 2, 0, 0,
{
int fd;
port = SCM_COERCE_OUTPORT (port);
SCM_VALIDATE_OPFPORT (1, port);
fd = SCM_FPORT_FDES (port);
if (tcsetpgrp (fd, scm_to_int (pgid)) == -1)