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This undoes most of the changes from these commits: commitec8e2b6d30Date: Fri Jun 14 23:43:00 2019 +0100 gdb: Don't allow annotations to influence what else GDB prints commit0d3abd8cc9Date: Wed Jun 12 22:34:26 2019 +0100 gdb: Remove an update of current_source_line and current_source_symtab as a result of the discussion here: https://sourceware.org/pipermail/gdb/2020-April/048468.html Having taken time to reflect on the discussion, and reading the documentation again I believe we should revert GDB's behaviour back to how it used to be. The original concern that triggered the initial patch was that when annotations were on the current source and line were updated (inside the annotation code), while when annotations are off this update would not occur. This was incorrect, as printing the source with the call to print_source_lines does also update the current source and line. Further, the documentation here: https://sourceware.org/gdb/current/onlinedocs/gdb/Source-Annotations.html#Source-Annotations Clearly states: "The following annotation is used instead of displaying source code: ^Z^Zsource filename:line:character:middle:addr ..." So it is documented that the 'source' annotation is a replacement for, and not in addition to, actually printing the source lie. There are still a few issues that I can see, these are: 1. In source.c:info_line_command, when annotations are on we call annotate_source_line, however, if annotations are off then there is no corresponding call to print the source line. This means that a if a user uses 'info line ...' with annotations on, and then does a 'list', they will get different results than if they had done this with annotations off. 2. It bothers me that the call to annotate_source_line returns a boolean, and that this controls a call to print_source_line (in stack.c:print_frame_info). The reason for this is that the source line annotation will only print something if the file is found, and the line number is in range for the file. It seems to me like an annotation should always be printed, either one that identifies the file and line, or one that identifies the file and line GDB would like to access, but couldn't. I considered changing this, but in the end decided not too, if I extend the existing 'source' annotation to print something in all cases then I risk breaking existing UIs that rely on the file and line always being valid. If I add a new annotation then this might also break existing UIs that rely on GDB itself printing the error from within print_source_line. Given that annotations is deprecated (as I understand it) mechanism for UIs to interact with GDB (in favour of MI) I figure we should just restore the old behaviour, and leave the mini-bugs in until someone actually complains. This isn't a straight revert of the two commits mentioned above. I've left annotate_source_line instead of going back to the original identify_source_line, which lived in source.c, but was really annotation related. The API for setting the current source and line has changed since the original patches, so I updated for that change too. Finally I wrote the code in stack.c so that we avoided an extra level of indentation, which I felt made things easier to read. gdb/ChangeLog: * annotate.c (annotate_source_line): Update return type, add call to update current symtab and line. * annotate.h (annotate_source_line): Update return type, and extend header comment. * source.c (info_line_command): Check annotation_level before calling annotate_source_line. * stack.c (print_frame_info): If calling annotate_source_line returns true, then don't print any other source line information. gdb/testsuite/ChangeLog: * gdb.base/annota1.exp: Update expected results. * gdb.cp/annota2.exp: Update expected results, remove duplicate test name. * gdb.cp/annota3.exp: Update expected results.
136 lines
4.9 KiB
C
136 lines
4.9 KiB
C
/* Annotation routines for GDB.
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Copyright (C) 1986-2020 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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#ifndef ANNOTATE_H
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#define ANNOTATE_H
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#include "symtab.h"
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#include "gdbtypes.h"
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extern void annotate_breakpoint (int);
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extern void annotate_catchpoint (int);
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extern void annotate_watchpoint (int);
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extern void annotate_starting (void);
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extern void annotate_stopped (void);
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extern void annotate_exited (int);
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extern void annotate_signalled (void);
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extern void annotate_signal_name (void);
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extern void annotate_signal_name_end (void);
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extern void annotate_signal_string (void);
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extern void annotate_signal_string_end (void);
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extern void annotate_signal (void);
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extern void annotate_breakpoints_headers (void);
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extern void annotate_field (int);
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extern void annotate_breakpoints_table (void);
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extern void annotate_record (void);
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extern void annotate_breakpoints_table_end (void);
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extern void annotate_frames_invalid (void);
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extern void annotate_new_thread (void);
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extern void annotate_thread_changed (void);
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extern void annotate_display_prompt (void);
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struct type;
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extern void annotate_field_begin (struct type *);
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extern void annotate_field_name_end (void);
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extern void annotate_field_value (void);
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extern void annotate_field_end (void);
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extern void annotate_quit (void);
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extern void annotate_error (void);
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extern void annotate_error_begin (void);
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extern void annotate_value_history_begin (int, struct type *);
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extern void annotate_value_begin (struct type *);
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extern void annotate_value_history_value (void);
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extern void annotate_value_history_end (void);
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extern void annotate_value_end (void);
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extern void annotate_display_begin (void);
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extern void annotate_display_number_end (void);
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extern void annotate_display_format (void);
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extern void annotate_display_expression (void);
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extern void annotate_display_expression_end (void);
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extern void annotate_display_value (void);
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extern void annotate_display_end (void);
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extern void annotate_arg_begin (void);
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extern void annotate_arg_name_end (void);
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extern void annotate_arg_value (struct type *);
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extern void annotate_arg_end (void);
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/* Wrap calls to annotate_arg_begin and annotate_arg_end in an RAII
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class. */
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struct annotate_arg_emitter
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{
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annotate_arg_emitter () { annotate_arg_begin (); }
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~annotate_arg_emitter () { annotate_arg_end (); }
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DISABLE_COPY_AND_ASSIGN (annotate_arg_emitter);
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};
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/* If annotations are turned on then print annotation describing the full
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name of the source file S and the line number LINE and its corresponding
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character position.
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MID_STATEMENT is nonzero if the PC is not at the beginning of that
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line.
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The current symtab and line is updated to reflect S and LINE.
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Return true if the annotation was printed and the current symtab and
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line were updated, otherwise return false, which can happen if the
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source file for S can't be found, or LINE is out of range.
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This does leave GDB in the weird situation where, even when annotations
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are on, we only sometimes print the annotation, and only sometimes
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update the current symtab and line. However, this particular annotation
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has behaved this way for some time, and front ends that still use
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annotations now depend on this behaviour. */
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extern bool annotate_source_line (struct symtab *s, int line,
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int mid_statement, CORE_ADDR pc);
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extern void annotate_frame_begin (int, struct gdbarch *, CORE_ADDR);
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extern void annotate_function_call (void);
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extern void annotate_signal_handler_caller (void);
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extern void annotate_frame_address (void);
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extern void annotate_frame_address_end (void);
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extern void annotate_frame_function_name (void);
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extern void annotate_frame_args (void);
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extern void annotate_frame_source_begin (void);
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extern void annotate_frame_source_file (void);
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extern void annotate_frame_source_file_end (void);
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extern void annotate_frame_source_line (void);
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extern void annotate_frame_source_end (void);
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extern void annotate_frame_where (void);
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extern void annotate_frame_end (void);
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extern void annotate_array_section_begin (int, struct type *);
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extern void annotate_elt_rep (unsigned int);
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extern void annotate_elt_rep_end (void);
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extern void annotate_elt (void);
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extern void annotate_array_section_end (void);
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extern void (*deprecated_annotate_signalled_hook) (void);
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extern void (*deprecated_annotate_signal_hook) (void);
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#endif /* ANNOTATE_H */
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