From 98d9f24ed15c5ca33bff06647d87b85e22e586d2 Mon Sep 17 00:00:00 2001 From: Pedro Alves Date: Tue, 21 Jun 2016 01:11:53 +0100 Subject: [PATCH] Make main_ui be heap allocated This is preparation for being able to create more than one UI object. The change to gdb_main to stop using catch_errors is necessary because catch_errors references current_uiout, which expands to current_ui->m_current_ui, which would crash because current_ui is not initialized yet at that point. It didn't trigger earlier in the series because before this patch, main_ui/current_ui always start out non-NULL. gdb/ChangeLog: 2016-06-21 Pedro Alves * event-top.c (main_ui_): Delete. (main_ui, current_ui, ui_list): No longer initialize here. * main.c (captured_main): UI initialization code factored out to new new_ui function. (gdb_main): Wrap captured_main with TRY/CATCH instead of catch_errors. * top.c (highest_ui_num): New global. (new_ui): New function. * top.h (struct ui) : New field. (new_ui): New declaration. --- gdb/ChangeLog | 13 +++++++++++++ gdb/event-top.c | 9 ++++----- gdb/main.c | 27 ++++++++++++--------------- gdb/top.c | 40 ++++++++++++++++++++++++++++++++++++++++ gdb/top.h | 6 ++++++ 5 files changed, 75 insertions(+), 20 deletions(-) diff --git a/gdb/ChangeLog b/gdb/ChangeLog index cd147a6d7e7..b21f7c16567 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,16 @@ +2016-06-21 Pedro Alves + + * event-top.c (main_ui_): Delete. + (main_ui, current_ui, ui_list): No longer initialize here. + * main.c (captured_main): UI initialization code factored out to + new new_ui function. + (gdb_main): Wrap captured_main with TRY/CATCH instead of + catch_errors. + * top.c (highest_ui_num): New global. + (new_ui): New function. + * top.h (struct ui) : New field. + (new_ui): New declaration. + 2016-06-21 Pedro Alves * cli/cli-interp.c (cli_on_normal_stop): Bail out early if there's diff --git a/gdb/event-top.c b/gdb/event-top.c index c9e754875df..318da1d32e1 100644 --- a/gdb/event-top.c +++ b/gdb/event-top.c @@ -441,12 +441,11 @@ top_level_prompt (void) return xstrdup (prompt); } -/* The main UI. */ -static struct ui main_ui_; +/* See top.h. */ -struct ui *main_ui = &main_ui_; -struct ui *current_ui = &main_ui_; -struct ui *ui_list = &main_ui_; +struct ui *main_ui; +struct ui *current_ui; +struct ui *ui_list; /* See top.h. */ diff --git a/gdb/main.c b/gdb/main.c index c45bffd81e6..f4e5b2f4c3b 100644 --- a/gdb/main.c +++ b/gdb/main.c @@ -443,7 +443,6 @@ DEF_VEC_O (cmdarg_s); static int captured_main (void *data) { - struct ui *ui = current_ui; struct captured_main_args *context = (struct captured_main_args *) data; int argc = context->argc; char **argv = context->argv; @@ -514,26 +513,15 @@ captured_main (void *data) saved_command_line = (char *) xstrdup (""); - ui->instream = stdin; - ui->outstream = stdout; - ui->errstream = stderr; - - ui->input_fd = fileno (stdin); - - ui->prompt_state = PROMPT_NEEDED; - #ifdef __MINGW32__ /* Ensure stderr is unbuffered. A Cygwin pty or pipe is implemented as a Windows pipe, and Windows buffers on pipes. */ setvbuf (stderr, NULL, _IONBF, BUFSIZ); #endif - gdb_stdout = stdio_fileopen (stdout); - gdb_stderr = stderr_fileopen (stderr); + main_ui = new_ui (stdin, stdout, stderr); + current_ui = main_ui; - gdb_stdlog = gdb_stderr; /* for moment */ - gdb_stdtarg = gdb_stderr; /* for moment */ - gdb_stdin = stdio_fileopen (stdin); gdb_stdtargerr = gdb_stderr; /* for moment */ gdb_stdtargin = gdb_stdin; /* for moment */ @@ -1174,7 +1162,16 @@ captured_main (void *data) int gdb_main (struct captured_main_args *args) { - catch_errors (captured_main, args, "", RETURN_MASK_ALL); + TRY + { + captured_main (args); + } + CATCH (ex, RETURN_MASK_ALL) + { + exception_print (gdb_stderr, ex); + } + END_CATCH + /* The only way to end up here is by an error (normal exit is handled by quit_force()), hence always return an error status. */ return 1; diff --git a/gdb/top.c b/gdb/top.c index e40835b7e73..c5e237d1031 100644 --- a/gdb/top.c +++ b/gdb/top.c @@ -246,6 +246,46 @@ void (*deprecated_call_command_hook) (struct cmd_list_element * c, void (*deprecated_context_hook) (int id); +/* The highest UI number ever assigned. */ +static int highest_ui_num; + +/* See top.h. */ + +struct ui * +new_ui (FILE *instream, FILE *outstream, FILE *errstream) +{ + struct ui *ui; + + ui = XCNEW (struct ui); + + ui->num = ++highest_ui_num; + ui->instream = instream; + ui->outstream = outstream; + ui->errstream = errstream; + + ui->input_fd = fileno (ui->instream); + + ui->m_gdb_stdin = stdio_fileopen (ui->instream); + ui->m_gdb_stdout = stdio_fileopen (ui->outstream); + ui->m_gdb_stderr = stderr_fileopen (ui->errstream); + ui->m_gdb_stdlog = ui->m_gdb_stderr; + + ui->prompt_state = PROMPT_NEEDED; + + if (ui_list == NULL) + ui_list = ui; + else + { + struct ui *last; + + for (last = ui_list; last->next != NULL; last = last->next) + ; + last->next = ui; + } + + return ui; +} + /* Handler for SIGHUP. */ #ifdef SIGHUP diff --git a/gdb/top.h b/gdb/top.h index df96baa1672..9766cd58601 100644 --- a/gdb/top.h +++ b/gdb/top.h @@ -57,6 +57,9 @@ struct ui /* Pointer to next in singly-linked list. */ struct ui *next; + /* Convenient handle (UI number). Unique across all UIs. */ + int num; + /* The UI's command line buffer. This is to used to accumulate input until we have a whole command line. */ struct buffer line_buffer; @@ -170,6 +173,9 @@ extern void switch_thru_all_uis_next (struct switch_thru_all_uis *state); #define ALL_UIS(UI) \ for (UI = ui_list; UI; UI = UI->next) \ +/* Create a new UI. */ +extern struct ui *new_ui (FILE *instream, FILE *outstream, FILE *errstream); + /* Cleanup that restores the current UI. */ extern void restore_ui_cleanup (void *data); -- 2.30.2