| 1 | /* Exception (throw catch) mechanism, for GDB, the GNU debugger. |
| 2 | |
| 3 | Copyright (C) 1986-2019 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GDB. |
| 6 | |
| 7 | This program is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | This program is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | #include "defs.h" |
| 21 | #include "exceptions.h" |
| 22 | #include "breakpoint.h" |
| 23 | #include "target.h" |
| 24 | #include "inferior.h" |
| 25 | #include "annotate.h" |
| 26 | #include "ui-out.h" |
| 27 | #include "serial.h" |
| 28 | #include "gdbthread.h" |
| 29 | #include "top.h" |
| 30 | #include "common/gdb_optional.h" |
| 31 | |
| 32 | static void |
| 33 | print_flush (void) |
| 34 | { |
| 35 | struct ui *ui = current_ui; |
| 36 | struct serial *gdb_stdout_serial; |
| 37 | |
| 38 | if (deprecated_error_begin_hook) |
| 39 | deprecated_error_begin_hook (); |
| 40 | |
| 41 | gdb::optional<target_terminal::scoped_restore_terminal_state> term_state; |
| 42 | /* While normally there's always something pushed on the target |
| 43 | stack, the NULL check is needed here because we can get here very |
| 44 | early during startup, before the target stack is first |
| 45 | initialized. */ |
| 46 | if (current_top_target () != NULL && target_supports_terminal_ours ()) |
| 47 | { |
| 48 | term_state.emplace (); |
| 49 | target_terminal::ours_for_output (); |
| 50 | } |
| 51 | |
| 52 | /* We want all output to appear now, before we print the error. We |
| 53 | have 3 levels of buffering we have to flush (it's possible that |
| 54 | some of these should be changed to flush the lower-level ones |
| 55 | too): */ |
| 56 | |
| 57 | /* 1. The _filtered buffer. */ |
| 58 | if (filtered_printing_initialized ()) |
| 59 | wrap_here (""); |
| 60 | |
| 61 | /* 2. The stdio buffer. */ |
| 62 | gdb_flush (gdb_stdout); |
| 63 | gdb_flush (gdb_stderr); |
| 64 | |
| 65 | /* 3. The system-level buffer. */ |
| 66 | gdb_stdout_serial = serial_fdopen (fileno (ui->outstream)); |
| 67 | if (gdb_stdout_serial) |
| 68 | { |
| 69 | serial_drain_output (gdb_stdout_serial); |
| 70 | serial_un_fdopen (gdb_stdout_serial); |
| 71 | } |
| 72 | |
| 73 | annotate_error_begin (); |
| 74 | } |
| 75 | |
| 76 | static void |
| 77 | print_exception (struct ui_file *file, const struct gdb_exception &e) |
| 78 | { |
| 79 | /* KLUGE: cagney/2005-01-13: Write the string out one line at a time |
| 80 | as that way the MI's behavior is preserved. */ |
| 81 | const char *start; |
| 82 | const char *end; |
| 83 | |
| 84 | for (start = e.what (); start != NULL; start = end) |
| 85 | { |
| 86 | end = strchr (start, '\n'); |
| 87 | if (end == NULL) |
| 88 | fputs_filtered (start, file); |
| 89 | else |
| 90 | { |
| 91 | end++; |
| 92 | ui_file_write (file, start, end - start); |
| 93 | } |
| 94 | } |
| 95 | fprintf_filtered (file, "\n"); |
| 96 | |
| 97 | /* Now append the annotation. */ |
| 98 | switch (e.reason) |
| 99 | { |
| 100 | case RETURN_QUIT: |
| 101 | annotate_quit (); |
| 102 | break; |
| 103 | case RETURN_ERROR: |
| 104 | /* Assume that these are all errors. */ |
| 105 | annotate_error (); |
| 106 | break; |
| 107 | default: |
| 108 | internal_error (__FILE__, __LINE__, _("Bad switch.")); |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | void |
| 113 | exception_print (struct ui_file *file, const struct gdb_exception &e) |
| 114 | { |
| 115 | if (e.reason < 0 && e.message != NULL) |
| 116 | { |
| 117 | print_flush (); |
| 118 | print_exception (file, e); |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | void |
| 123 | exception_fprintf (struct ui_file *file, const struct gdb_exception &e, |
| 124 | const char *prefix, ...) |
| 125 | { |
| 126 | if (e.reason < 0 && e.message != NULL) |
| 127 | { |
| 128 | va_list args; |
| 129 | |
| 130 | print_flush (); |
| 131 | |
| 132 | /* Print the prefix. */ |
| 133 | va_start (args, prefix); |
| 134 | vfprintf_filtered (file, prefix, args); |
| 135 | va_end (args); |
| 136 | |
| 137 | print_exception (file, e); |
| 138 | } |
| 139 | } |
| 140 | |
| 141 | /* See exceptions.h. */ |
| 142 | |
| 143 | int |
| 144 | exception_print_same (const struct gdb_exception &e1, |
| 145 | const struct gdb_exception &e2) |
| 146 | { |
| 147 | const char *msg1 = e1.message == nullptr ? "" : e1.what (); |
| 148 | const char *msg2 = e2.message == nullptr ? "" : e2.what (); |
| 149 | |
| 150 | return (e1.reason == e2.reason |
| 151 | && e1.error == e2.error |
| 152 | && strcmp (msg1, msg2) == 0); |
| 153 | } |