mirror of
https://sourceware.org/git/binutils-gdb.git
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1d506c26d9
This commit is the result of the following actions:
- Running gdb/copyright.py to update all of the copyright headers to
include 2024,
- Manually updating a few files the copyright.py script told me to
update, these files had copyright headers embedded within the
file,
- Regenerating gdbsupport/Makefile.in to refresh it's copyright
date,
- Using grep to find other files that still mentioned 2023. If
these files were updated last year from 2022 to 2023 then I've
updated them this year to 2024.
I'm sure I've probably missed some dates. Feel free to fix them up as
you spot them.
701 lines
20 KiB
C
701 lines
20 KiB
C
/* GDB/Scheme exception support.
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Copyright (C) 2014-2024 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* See README file in this directory for implementation notes, coding
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conventions, et.al. */
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/* Notes:
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IWBN to support SRFI 34/35. At the moment we follow Guile's own
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exception mechanism.
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The non-static functions in this file have prefix gdbscm_ and
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not exscm_ on purpose. */
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#include "defs.h"
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#include <signal.h>
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#include "guile-internal.h"
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/* The <gdb:exception> smob.
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This is used to record and handle Scheme exceptions.
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One important invariant is that <gdb:exception> smobs are never a valid
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result of a function, other than to signify an exception occurred. */
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struct exception_smob
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{
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/* This always appears first. */
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gdb_smob base;
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/* The key and args parameters to "throw". */
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SCM key;
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SCM args;
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};
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static const char exception_smob_name[] = "gdb:exception";
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/* The tag Guile knows the exception smob by. */
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static scm_t_bits exception_smob_tag;
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/* A generic error in struct gdb_exception.
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I.e., not RETURN_QUIT and not MEMORY_ERROR. */
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static SCM error_symbol;
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/* An error occurred accessing inferior memory.
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This is not a Scheme programming error. */
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static SCM memory_error_symbol;
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/* User interrupt, e.g., RETURN_QUIT in struct gdb_exception. */
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static SCM signal_symbol;
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/* A user error, e.g., bad arg to gdb command. */
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static SCM user_error_symbol;
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/* Printing the stack is done by first capturing the stack and recording it in
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a <gdb:exception> object with this key and with the ARGS field set to
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(cons real-key (cons stack real-args)).
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See gdbscm_make_exception_with_stack. */
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static SCM with_stack_error_symbol;
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/* The key to use for an invalid object exception. An invalid object is one
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where the underlying object has been removed from GDB. */
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SCM gdbscm_invalid_object_error_symbol;
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/* Values for "guile print-stack" as symbols. */
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static SCM none_symbol;
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static SCM message_symbol;
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static SCM full_symbol;
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static const char percent_print_exception_message_name[] =
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"%print-exception-message";
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/* Variable containing %print-exception-message.
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It is not defined until late in initialization, after our init routine
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has run. Cope by looking it up lazily. */
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static SCM percent_print_exception_message_var = SCM_BOOL_F;
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static const char percent_print_exception_with_stack_name[] =
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"%print-exception-with-stack";
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/* Variable containing %print-exception-with-stack.
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It is not defined until late in initialization, after our init routine
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has run. Cope by looking it up lazily. */
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static SCM percent_print_exception_with_stack_var = SCM_BOOL_F;
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/* Counter to keep track of the number of times we create a <gdb:exception>
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object, for performance monitoring purposes. */
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static unsigned long gdbscm_exception_count = 0;
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/* Administrivia for exception smobs. */
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/* The smob "print" function for <gdb:exception>. */
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static int
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exscm_print_exception_smob (SCM self, SCM port, scm_print_state *pstate)
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{
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exception_smob *e_smob = (exception_smob *) SCM_SMOB_DATA (self);
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gdbscm_printf (port, "#<%s ", exception_smob_name);
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scm_write (e_smob->key, port);
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scm_puts (" ", port);
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scm_write (e_smob->args, port);
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scm_puts (">", port);
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scm_remember_upto_here_1 (self);
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/* Non-zero means success. */
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return 1;
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}
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/* (make-exception key args) -> <gdb:exception> */
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SCM
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gdbscm_make_exception (SCM key, SCM args)
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{
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exception_smob *e_smob = (exception_smob *)
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scm_gc_malloc (sizeof (exception_smob), exception_smob_name);
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SCM smob;
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e_smob->key = key;
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e_smob->args = args;
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smob = scm_new_smob (exception_smob_tag, (scm_t_bits) e_smob);
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gdbscm_init_gsmob (&e_smob->base);
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++gdbscm_exception_count;
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return smob;
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}
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/* Return non-zero if SCM is a <gdb:exception> object. */
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int
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gdbscm_is_exception (SCM scm)
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{
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return SCM_SMOB_PREDICATE (exception_smob_tag, scm);
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}
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/* (exception? scm) -> boolean */
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static SCM
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gdbscm_exception_p (SCM scm)
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{
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return scm_from_bool (gdbscm_is_exception (scm));
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}
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/* (exception-key <gdb:exception>) -> key */
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SCM
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gdbscm_exception_key (SCM self)
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{
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exception_smob *e_smob;
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SCM_ASSERT_TYPE (gdbscm_is_exception (self), self, SCM_ARG1, FUNC_NAME,
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"gdb:exception");
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e_smob = (exception_smob *) SCM_SMOB_DATA (self);
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return e_smob->key;
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}
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/* (exception-args <gdb:exception>) -> arg-list */
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SCM
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gdbscm_exception_args (SCM self)
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{
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exception_smob *e_smob;
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SCM_ASSERT_TYPE (gdbscm_is_exception (self), self, SCM_ARG1, FUNC_NAME,
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"gdb:exception");
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e_smob = (exception_smob *) SCM_SMOB_DATA (self);
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return e_smob->args;
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}
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/* Wrap an exception in a <gdb:exception> object that includes STACK.
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gdbscm_print_exception_with_stack knows how to unwrap it. */
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SCM
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gdbscm_make_exception_with_stack (SCM key, SCM args, SCM stack)
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{
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return gdbscm_make_exception (with_stack_error_symbol,
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scm_cons (key, scm_cons (stack, args)));
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}
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/* Version of scm_error_scm that creates a gdb:exception object that can later
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be passed to gdbscm_throw.
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KEY is a symbol denoting the kind of error.
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SUBR is either #f or a string marking the function in which the error
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occurred.
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MESSAGE is either #f or the error message string. It may contain ~a and ~s
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modifiers, provided by ARGS.
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ARGS is a list of args to MESSAGE.
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DATA is an arbitrary object, its value depends on KEY. The value to pass
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here is a bit underspecified by Guile. */
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SCM
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gdbscm_make_error_scm (SCM key, SCM subr, SCM message, SCM args, SCM data)
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{
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return gdbscm_make_exception (key, scm_list_4 (subr, message, args, data));
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}
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/* Version of scm_error that creates a gdb:exception object that can later
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be passed to gdbscm_throw.
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See gdbscm_make_error_scm for a description of the arguments. */
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SCM
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gdbscm_make_error (SCM key, const char *subr, const char *message,
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SCM args, SCM data)
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{
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return gdbscm_make_error_scm
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(key,
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subr == NULL ? SCM_BOOL_F : scm_from_latin1_string (subr),
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message == NULL ? SCM_BOOL_F : scm_from_latin1_string (message),
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args, data);
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}
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/* Version of SCM_ASSERT_TYPE/scm_wrong_type_arg_msg that creates a
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gdb:exception object that can later be passed to gdbscm_throw. */
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SCM
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gdbscm_make_type_error (const char *subr, int arg_pos, SCM bad_value,
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const char *expected_type)
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{
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gdb::unique_xmalloc_ptr<char> msg;
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SCM result;
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if (arg_pos > 0)
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{
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if (expected_type != NULL)
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{
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msg = xstrprintf (_("Wrong type argument in position %d"
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" (expecting %s): ~S"),
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arg_pos, expected_type);
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}
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else
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{
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msg = xstrprintf (_("Wrong type argument in position %d: ~S"),
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arg_pos);
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}
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}
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else
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{
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if (expected_type != NULL)
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{
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msg = xstrprintf (_("Wrong type argument (expecting %s): ~S"),
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expected_type);
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}
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else
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msg = xstrprintf (_("Wrong type argument: ~S"));
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}
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result = gdbscm_make_error (scm_arg_type_key, subr, msg.get (),
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scm_list_1 (bad_value), scm_list_1 (bad_value));
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return result;
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}
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/* A variant of gdbscm_make_type_error for non-type argument errors.
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ERROR_PREFIX and ERROR are combined to build the error message.
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Care needs to be taken so that the i18n composed form is still
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reasonable, but no one is going to translate these anyway so we don't
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worry too much.
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ERROR_PREFIX may be NULL, ERROR may not be NULL. */
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static SCM
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gdbscm_make_arg_error (SCM key, const char *subr, int arg_pos, SCM bad_value,
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const char *error_prefix, const char *error)
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{
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gdb::unique_xmalloc_ptr<char> msg;
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SCM result;
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if (error_prefix != NULL)
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{
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if (arg_pos > 0)
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{
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msg = xstrprintf (_("%s %s in position %d: ~S"),
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error_prefix, error, arg_pos);
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}
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else
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msg = xstrprintf (_("%s %s: ~S"), error_prefix, error);
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}
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else
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{
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if (arg_pos > 0)
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msg = xstrprintf (_("%s in position %d: ~S"), error, arg_pos);
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else
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msg = xstrprintf (_("%s: ~S"), error);
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}
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result = gdbscm_make_error (key, subr, msg.get (), scm_list_1 (bad_value),
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scm_list_1 (bad_value));
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return result;
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}
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/* Make an invalid-object error <gdb:exception> object.
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OBJECT is the name of the kind of object that is invalid. */
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SCM
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gdbscm_make_invalid_object_error (const char *subr, int arg_pos, SCM bad_value,
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const char *object)
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{
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return gdbscm_make_arg_error (gdbscm_invalid_object_error_symbol,
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subr, arg_pos, bad_value,
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_("Invalid object:"), object);
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}
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/* Throw an invalid-object error.
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OBJECT is the name of the kind of object that is invalid. */
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void
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gdbscm_invalid_object_error (const char *subr, int arg_pos, SCM bad_value,
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const char *object)
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{
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SCM exception
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= gdbscm_make_invalid_object_error (subr, arg_pos, bad_value, object);
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gdbscm_throw (exception);
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}
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/* Make an out-of-range error <gdb:exception> object. */
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SCM
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gdbscm_make_out_of_range_error (const char *subr, int arg_pos, SCM bad_value,
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const char *error)
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{
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return gdbscm_make_arg_error (scm_out_of_range_key,
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subr, arg_pos, bad_value,
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_("Out of range:"), error);
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}
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/* Throw an out-of-range error.
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This is the standard Guile out-of-range exception. */
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void
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gdbscm_out_of_range_error (const char *subr, int arg_pos, SCM bad_value,
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const char *error)
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{
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SCM exception
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= gdbscm_make_out_of_range_error (subr, arg_pos, bad_value, error);
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gdbscm_throw (exception);
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}
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/* Make a misc-error <gdb:exception> object. */
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SCM
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gdbscm_make_misc_error (const char *subr, int arg_pos, SCM bad_value,
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const char *error)
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{
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return gdbscm_make_arg_error (scm_misc_error_key,
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subr, arg_pos, bad_value, NULL, error);
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}
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/* Throw a misc-error error. */
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void
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gdbscm_misc_error (const char *subr, int arg_pos, SCM bad_value,
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const char *error)
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{
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SCM exception = gdbscm_make_misc_error (subr, arg_pos, bad_value, error);
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gdbscm_throw (exception);
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}
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/* Return a <gdb:exception> object for gdb:memory-error. */
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SCM
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gdbscm_make_memory_error (const char *subr, const char *msg, SCM args)
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{
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return gdbscm_make_error (memory_error_symbol, subr, msg, args,
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SCM_EOL);
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}
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/* Throw a gdb:memory-error exception. */
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void
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gdbscm_memory_error (const char *subr, const char *msg, SCM args)
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{
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SCM exception = gdbscm_make_memory_error (subr, msg, args);
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gdbscm_throw (exception);
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}
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/* Return non-zero if KEY is gdb:memory-error.
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Note: This is an excp_matcher_func function. */
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int
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gdbscm_memory_error_p (SCM key)
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{
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return scm_is_eq (key, memory_error_symbol);
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}
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/* Return non-zero if KEY is gdb:user-error.
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Note: This is an excp_matcher_func function. */
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int
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gdbscm_user_error_p (SCM key)
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{
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return scm_is_eq (key, user_error_symbol);
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}
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/* Wrapper around scm_throw to throw a gdb:exception.
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This function does not return.
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This function cannot be called from inside TRY_CATCH. */
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void
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gdbscm_throw (SCM exception)
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{
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scm_throw (gdbscm_exception_key (exception),
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gdbscm_exception_args (exception));
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gdb_assert_not_reached ("scm_throw returned");
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}
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/* Convert a GDB exception to a <gdb:exception> object. */
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SCM
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gdbscm_scm_from_gdb_exception (const gdbscm_gdb_exception &exception)
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{
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SCM key;
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if (exception.reason == RETURN_QUIT)
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{
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/* Handle this specially to be consistent with top-repl.scm. */
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return gdbscm_make_error (signal_symbol, NULL, _("User interrupt"),
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SCM_EOL, scm_list_1 (scm_from_int (SIGINT)));
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}
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if (exception.error == MEMORY_ERROR)
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key = memory_error_symbol;
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else
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key = error_symbol;
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return gdbscm_make_error (key, NULL, "~A",
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scm_list_1 (gdbscm_scm_from_c_string
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(exception.message)),
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SCM_BOOL_F);
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}
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/* Convert a GDB exception to the appropriate Scheme exception and throw it.
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This function does not return. */
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void
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gdbscm_throw_gdb_exception (gdbscm_gdb_exception exception)
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{
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SCM scm_exception = gdbscm_scm_from_gdb_exception (exception);
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xfree (exception.message);
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gdbscm_throw (scm_exception);
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}
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/* Print the error message portion of an exception.
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If PORT is #f, use the standard error port.
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KEY cannot be gdb:with-stack.
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Basically this function is just a wrapper around calling
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%print-exception-message. */
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static void
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gdbscm_print_exception_message (SCM port, SCM frame, SCM key, SCM args)
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{
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SCM printer, status;
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if (gdbscm_is_false (port))
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port = scm_current_error_port ();
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gdb_assert (!scm_is_eq (key, with_stack_error_symbol));
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/* This does not use scm_print_exception because we tweak the output a bit.
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Compare Guile's print-exception with our %print-exception-message for
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details. */
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if (gdbscm_is_false (percent_print_exception_message_var))
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{
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percent_print_exception_message_var
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= scm_c_private_variable (gdbscm_init_module_name,
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percent_print_exception_message_name);
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/* If we can't find %print-exception-message, there's a problem on the
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Scheme side. Don't kill GDB, just flag an error and leave it at
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that. */
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if (gdbscm_is_false (percent_print_exception_message_var))
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{
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gdbscm_printf (port, _("Error in Scheme exception printing,"
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" can't find %s.\n"),
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percent_print_exception_message_name);
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return;
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}
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}
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printer = scm_variable_ref (percent_print_exception_message_var);
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status = gdbscm_safe_call_4 (printer, port, frame, key, args, NULL);
|
||
|
||
/* If that failed still tell the user something.
|
||
But don't use the exception printing machinery! */
|
||
if (gdbscm_is_exception (status))
|
||
{
|
||
gdbscm_printf (port, _("Error in Scheme exception printing:\n"));
|
||
scm_display (status, port);
|
||
scm_newline (port);
|
||
}
|
||
}
|
||
|
||
/* Print the description of exception KEY, ARGS to PORT, according to the
|
||
setting of "set guile print-stack".
|
||
If PORT is #f, use the standard error port.
|
||
If STACK is #f, never print the stack, regardless of whether printing it
|
||
is enabled. If STACK is #t, then print it if it is contained in ARGS
|
||
(i.e., KEY is gdb:with-stack). Otherwise STACK is the result of calling
|
||
scm_make_stack (which will be ignored in favor of the stack in ARGS if
|
||
KEY is gdb:with-stack).
|
||
KEY, ARGS are the standard arguments to scm_throw, et.al.
|
||
|
||
Basically this function is just a wrapper around calling
|
||
%print-exception-with-stack. */
|
||
|
||
void
|
||
gdbscm_print_exception_with_stack (SCM port, SCM stack, SCM key, SCM args)
|
||
{
|
||
SCM printer, status;
|
||
|
||
if (gdbscm_is_false (port))
|
||
port = scm_current_error_port ();
|
||
|
||
if (gdbscm_is_false (percent_print_exception_with_stack_var))
|
||
{
|
||
percent_print_exception_with_stack_var
|
||
= scm_c_private_variable (gdbscm_init_module_name,
|
||
percent_print_exception_with_stack_name);
|
||
/* If we can't find %print-exception-with-stack, there's a problem on the
|
||
Scheme side. Don't kill GDB, just flag an error and leave it at
|
||
that. */
|
||
if (gdbscm_is_false (percent_print_exception_with_stack_var))
|
||
{
|
||
gdbscm_printf (port, _("Error in Scheme exception printing,"
|
||
" can't find %s.\n"),
|
||
percent_print_exception_with_stack_name);
|
||
return;
|
||
}
|
||
}
|
||
printer = scm_variable_ref (percent_print_exception_with_stack_var);
|
||
|
||
status = gdbscm_safe_call_4 (printer, port, stack, key, args, NULL);
|
||
|
||
/* If that failed still tell the user something.
|
||
But don't use the exception printing machinery! */
|
||
if (gdbscm_is_exception (status))
|
||
{
|
||
gdbscm_printf (port, _("Error in Scheme exception printing:\n"));
|
||
scm_display (status, port);
|
||
scm_newline (port);
|
||
}
|
||
}
|
||
|
||
/* Print EXCEPTION, a <gdb:exception> object, to PORT.
|
||
If PORT is #f, use the standard error port. */
|
||
|
||
void
|
||
gdbscm_print_gdb_exception (SCM port, SCM exception)
|
||
{
|
||
gdb_assert (gdbscm_is_exception (exception));
|
||
|
||
gdbscm_print_exception_with_stack (port, SCM_BOOL_T,
|
||
gdbscm_exception_key (exception),
|
||
gdbscm_exception_args (exception));
|
||
}
|
||
|
||
/* Return a string description of <gdb:exception> EXCEPTION.
|
||
If EXCEPTION is a gdb:with-stack exception, unwrap it, a backtrace
|
||
is never returned as part of the result. */
|
||
|
||
gdb::unique_xmalloc_ptr<char>
|
||
gdbscm_exception_message_to_string (SCM exception)
|
||
{
|
||
SCM port = scm_open_output_string ();
|
||
SCM key, args;
|
||
|
||
gdb_assert (gdbscm_is_exception (exception));
|
||
|
||
key = gdbscm_exception_key (exception);
|
||
args = gdbscm_exception_args (exception);
|
||
|
||
if (scm_is_eq (key, with_stack_error_symbol)
|
||
/* Don't crash on a badly generated gdb:with-stack exception. */
|
||
&& scm_is_pair (args)
|
||
&& scm_is_pair (scm_cdr (args)))
|
||
{
|
||
key = scm_car (args);
|
||
args = scm_cddr (args);
|
||
}
|
||
|
||
gdbscm_print_exception_message (port, SCM_BOOL_F, key, args);
|
||
gdb::unique_xmalloc_ptr<char> result
|
||
= gdbscm_scm_to_c_string (scm_get_output_string (port));
|
||
scm_close_port (port);
|
||
return result;
|
||
}
|
||
|
||
/* Return the value of the "guile print-stack" option as one of:
|
||
'none, 'message, 'full. */
|
||
|
||
static SCM
|
||
gdbscm_percent_exception_print_style (void)
|
||
{
|
||
if (gdbscm_print_excp == gdbscm_print_excp_none)
|
||
return none_symbol;
|
||
if (gdbscm_print_excp == gdbscm_print_excp_message)
|
||
return message_symbol;
|
||
if (gdbscm_print_excp == gdbscm_print_excp_full)
|
||
return full_symbol;
|
||
gdb_assert_not_reached ("bad value for \"guile print-stack\"");
|
||
}
|
||
|
||
/* Return the current <gdb:exception> counter.
|
||
This is for debugging purposes. */
|
||
|
||
static SCM
|
||
gdbscm_percent_exception_count (void)
|
||
{
|
||
return scm_from_ulong (gdbscm_exception_count);
|
||
}
|
||
|
||
/* Initialize the Scheme exception support. */
|
||
|
||
static const scheme_function exception_functions[] =
|
||
{
|
||
{ "make-exception", 2, 0, 0, as_a_scm_t_subr (gdbscm_make_exception),
|
||
"\
|
||
Create a <gdb:exception> object.\n\
|
||
\n\
|
||
Arguments: key args\n\
|
||
These are the standard key,args arguments of \"throw\"." },
|
||
|
||
{ "exception?", 1, 0, 0, as_a_scm_t_subr (gdbscm_exception_p),
|
||
"\
|
||
Return #t if the object is a <gdb:exception> object." },
|
||
|
||
{ "exception-key", 1, 0, 0, as_a_scm_t_subr (gdbscm_exception_key),
|
||
"\
|
||
Return the exception's key." },
|
||
|
||
{ "exception-args", 1, 0, 0, as_a_scm_t_subr (gdbscm_exception_args),
|
||
"\
|
||
Return the exception's arg list." },
|
||
|
||
END_FUNCTIONS
|
||
};
|
||
|
||
static const scheme_function private_exception_functions[] =
|
||
{
|
||
{ "%exception-print-style", 0, 0, 0,
|
||
as_a_scm_t_subr (gdbscm_percent_exception_print_style),
|
||
"\
|
||
Return the value of the \"guile print-stack\" option." },
|
||
|
||
{ "%exception-count", 0, 0, 0,
|
||
as_a_scm_t_subr (gdbscm_percent_exception_count),
|
||
"\
|
||
Return a count of the number of <gdb:exception> objects created.\n\
|
||
This is for debugging purposes." },
|
||
|
||
END_FUNCTIONS
|
||
};
|
||
|
||
void
|
||
gdbscm_initialize_exceptions (void)
|
||
{
|
||
exception_smob_tag = gdbscm_make_smob_type (exception_smob_name,
|
||
sizeof (exception_smob));
|
||
scm_set_smob_print (exception_smob_tag, exscm_print_exception_smob);
|
||
|
||
gdbscm_define_functions (exception_functions, 1);
|
||
gdbscm_define_functions (private_exception_functions, 0);
|
||
|
||
error_symbol = scm_from_latin1_symbol ("gdb:error");
|
||
|
||
memory_error_symbol = scm_from_latin1_symbol ("gdb:memory-error");
|
||
|
||
user_error_symbol = scm_from_latin1_symbol ("gdb:user-error");
|
||
|
||
gdbscm_invalid_object_error_symbol
|
||
= scm_from_latin1_symbol ("gdb:invalid-object-error");
|
||
|
||
with_stack_error_symbol = scm_from_latin1_symbol ("gdb:with-stack");
|
||
|
||
/* The text of this symbol is taken from Guile's top-repl.scm. */
|
||
signal_symbol = scm_from_latin1_symbol ("signal");
|
||
|
||
none_symbol = scm_from_latin1_symbol ("none");
|
||
message_symbol = scm_from_latin1_symbol ("message");
|
||
full_symbol = scm_from_latin1_symbol ("full");
|
||
}
|