Simplify ui-out level code
Now that we use a vector to store the levels, we don't have to keep a separate level field in ui_out to keep track of the current level. We can efficiently derive it from the vector size. That causes a little change in the meaning of the level, as in they are now 1-based instead of 0-based (the initial level has the "id" 1 now), but it shouldn't change anything in the behavior. Additionally, push_level and pop_level don't really need to return the new level, making them return void simplifies the code a bit. Finally, the ui_out_begin/ui_out_end callbacks in the ui_out_impl interface don't need to be passed the level, it's never actually used. New in v2: - Remove or update stale comments. gdb/ChangeLog: * ui-out.h (ui_out_begin_ftype): Remove level parameter. (ui_out_end_ftype): Likewise. * ui-out.c (struct ui_out) <level>: Replace field with a method that dynamically computes the result. (current_level): Get vector's back item instead of using uiout->level. (push_level): Make return type void. (pop_level): Make return type void and update access to ui_out::level. (uo_begin): Remove level parameter. (uo_end): Likewise. (ui_out_table_begin): Update access to uiout::level. (ui_out_begin): Don't read return value from push_level, call uiout->level() instead, update call to uo_begin. (ui_out_end): Don't read return value from pop_level, update call to uo_end. (verify_field): Update access to uiout->level. (ui_out_new): Don't initialize ui_out::level, call push_level to push the initial level instead of doing it by hand. * cli-out.c (cli_begin): Remove level parameter. (cli_end): Likewise. * mi/mi-out.c (mi_begin): Likewise. (mi_end): Likewise.
This commit is contained in:
Simon Marchi
Simon Marchi
parent
909c0aa582
commit
33b2fac610
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@ -1,3 +1,29 @@
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2016-12-01 Simon Marchi <simon.marchi@polymtl.ca>
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* ui-out.h (ui_out_begin_ftype): Remove level parameter.
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(ui_out_end_ftype): Likewise.
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* ui-out.c (struct ui_out) <level>: Replace field with a method
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that dynamically computes the result.
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(current_level): Get vector's back item instead of using
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uiout->level.
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(push_level): Make return type void.
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(pop_level): Make return type void and update access to
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ui_out::level.
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(uo_begin): Remove level parameter.
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(uo_end): Likewise.
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(ui_out_table_begin): Update access to uiout::level.
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(ui_out_begin): Don't read return value from push_level, call
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uiout->level() instead, update call to uo_begin.
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(ui_out_end): Don't read return value from pop_level, update
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call to uo_end.
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(verify_field): Update access to uiout->level.
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(ui_out_new): Don't initialize ui_out::level, call push_level
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to push the initial level instead of doing it by hand.
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* cli-out.c (cli_begin): Remove level parameter.
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(cli_end): Likewise.
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* mi/mi-out.c (mi_begin): Likewise.
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(mi_end): Likewise.
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2016-12-01 Simon Marchi <simon.marchi@polymtl.ca>
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* ui-out.c (struct ui_out_level): Replace with ...
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@ -111,7 +111,6 @@ cli_table_header (struct ui_out *uiout, int width, enum ui_align alignment,
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static void
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cli_begin (struct ui_out *uiout,
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enum ui_out_type type,
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int level,
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const char *id)
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{
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cli_out_data *data = (cli_out_data *) ui_out_data (uiout);
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@ -124,8 +123,7 @@ cli_begin (struct ui_out *uiout,
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static void
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cli_end (struct ui_out *uiout,
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enum ui_out_type type,
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int level)
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enum ui_out_type type)
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{
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cli_out_data *data = (cli_out_data *) ui_out_data (uiout);
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@ -45,8 +45,8 @@ static void mi_table_header (struct ui_out *uiout, int width,
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const std::string &col_name,
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const std::string &col_hdr);
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static void mi_begin (struct ui_out *uiout, enum ui_out_type type,
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int level, const char *id);
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static void mi_end (struct ui_out *uiout, enum ui_out_type type, int level);
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const char *id);
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static void mi_end (struct ui_out *uiout, enum ui_out_type type);
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static void mi_field_int (struct ui_out *uiout, int fldno, int width,
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enum ui_align alig, const char *fldname, int value);
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static void mi_field_skip (struct ui_out *uiout, int fldno, int width,
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@ -159,8 +159,7 @@ mi_table_header (struct ui_out *uiout, int width, enum ui_align alignment,
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/* Mark beginning of a list. */
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void
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mi_begin (struct ui_out *uiout, enum ui_out_type type, int level,
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const char *id)
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mi_begin (struct ui_out *uiout, enum ui_out_type type, const char *id)
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{
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mi_out_data *data = (mi_out_data *) ui_out_data (uiout);
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@ -173,7 +172,7 @@ mi_begin (struct ui_out *uiout, enum ui_out_type type, int level,
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/* Mark end of a list. */
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void
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mi_end (struct ui_out *uiout, enum ui_out_type type, int level)
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mi_end (struct ui_out *uiout, enum ui_out_type type)
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{
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mi_out_data *data = (mi_out_data *) ui_out_data (uiout);
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68
gdb/ui-out.c
68
gdb/ui-out.c
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@ -170,12 +170,14 @@ struct ui_out
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const struct ui_out_impl *impl;
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void *data;
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/* Current level. */
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int level;
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/* Vector to store and track the ui-out levels. */
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std::vector<std::unique_ptr<ui_out_level>> levels;
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int level () const
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{
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return this->levels.size ();
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}
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/* A table, if any. At present only a single table is supported. */
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struct ui_out_table table;
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};
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@ -184,36 +186,30 @@ struct ui_out
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static ui_out_level *
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current_level (struct ui_out *uiout)
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{
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return uiout->levels[uiout->level].get ();
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return uiout->levels.back ().get ();
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}
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/* Create a new level, of TYPE. Return the new level's index. */
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static int
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/* Create a new level, of TYPE. */
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static void
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push_level (struct ui_out *uiout,
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enum ui_out_type type)
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{
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std::unique_ptr<ui_out_level> level (new ui_out_level (type));
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uiout->levels.push_back (std::move (level));
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uiout->level++;
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return uiout->level;
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}
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/* Discard the current level, return the discarded level's index.
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TYPE is the type of the level being discarded. */
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static int
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/* Discard the current level. TYPE is the type of the level being
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discarded. */
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static void
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pop_level (struct ui_out *uiout,
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enum ui_out_type type)
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{
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/* We had better not underflow the buffer. */
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gdb_assert (uiout->level > 0);
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gdb_assert (uiout->level () > 0);
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gdb_assert (current_level (uiout)->type () == type);
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uiout->levels.pop_back ();
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uiout->level--;
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return uiout->level + 1;
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}
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/* These are the interfaces to implementation functions. */
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@ -228,10 +224,9 @@ static void uo_table_header (struct ui_out *uiout, int width,
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const std::string &col_hdr);
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static void uo_begin (struct ui_out *uiout,
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enum ui_out_type type,
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int level, const char *id);
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const char *id);
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static void uo_end (struct ui_out *uiout,
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enum ui_out_type type,
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int level);
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enum ui_out_type type);
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static void uo_field_int (struct ui_out *uiout, int fldno, int width,
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enum ui_align align, const char *fldname, int value);
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static void uo_field_skip (struct ui_out *uiout, int fldno, int width,
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@ -277,7 +272,7 @@ previous table_end."));
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uiout->table.flag = 1;
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uiout->table.body_flag = 0;
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uiout->table.entry_level = uiout->level + 1;
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uiout->table.entry_level = uiout->level () + 1;
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uiout->table.columns = nbrofcols;
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uiout->table.id = tblid;
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@ -357,8 +352,6 @@ ui_out_begin (struct ui_out *uiout,
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enum ui_out_type type,
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const char *id)
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{
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int new_level;
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if (uiout->table.flag && !uiout->table.body_flag)
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internal_error (__FILE__, __LINE__,
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_("table header or table_body expected; lists must be \
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@ -379,24 +372,24 @@ specified after table_body."));
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verify_field (uiout, &fldno, &width, &align);
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}
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new_level = push_level (uiout, type);
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push_level (uiout, type);
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/* If the push puts us at the same level as a table row entry, we've
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got a new table row. Put the header pointer back to the start. */
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if (uiout->table.body_flag
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&& uiout->table.entry_level == new_level)
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&& uiout->table.entry_level == uiout->level ())
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uiout->table.headers_iterator = uiout->table.headers.begin ();
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uo_begin (uiout, type, new_level, id);
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uo_begin (uiout, type, id);
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}
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void
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ui_out_end (struct ui_out *uiout,
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enum ui_out_type type)
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{
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int old_level = pop_level (uiout, type);
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pop_level (uiout, type);
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uo_end (uiout, type, old_level);
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uo_end (uiout, type);
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}
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struct ui_out_end_cleanup_data
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@ -652,22 +645,20 @@ clear_table (struct ui_out *uiout)
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void
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uo_begin (struct ui_out *uiout,
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enum ui_out_type type,
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int level,
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const char *id)
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{
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if (uiout->impl->begin == NULL)
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return;
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uiout->impl->begin (uiout, type, level, id);
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uiout->impl->begin (uiout, type, id);
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}
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void
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uo_end (struct ui_out *uiout,
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enum ui_out_type type,
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int level)
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enum ui_out_type type)
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{
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if (uiout->impl->end == NULL)
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return;
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uiout->impl->end (uiout, type, level);
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uiout->impl->end (uiout, type);
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}
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void
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@ -832,17 +823,12 @@ verify_field (struct ui_out *uiout, int *fldno, int *width,
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internal_error (__FILE__, __LINE__,
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_("table_body missing; table fields must be \
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specified after table_body and inside a list."));
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/* NOTE: cagney/2001-12-08: There was a check here to ensure
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that this code was only executed when uiout->level was
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greater than zero. That no longer applies - this code is run
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before each table row tuple is started and at that point the
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level is zero. */
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}
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current->inc_field_count ();
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if (uiout->table.body_flag
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&& uiout->table.entry_level == uiout->level
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&& uiout->table.entry_level == uiout->level ()
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&& get_next_header (uiout, fldno, width, align, &text))
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{
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if (*fldno != current->field_count ())
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@ -906,11 +892,9 @@ ui_out_new (const struct ui_out_impl *impl, void *data,
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uiout->flags = flags;
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uiout->table.flag = 0;
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uiout->table.body_flag = 0;
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uiout->level = 0;
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/* Create uiout->level 0, the default level. */
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std::unique_ptr<ui_out_level> level (new ui_out_level (ui_out_type_tuple));
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uiout->levels.push_back (std::move (level));
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/* Create the ui-out level #1, the default level. */
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push_level (uiout, ui_out_type_tuple);
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uiout->table.headers_iterator = uiout->table.headers.end ();
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@ -157,14 +157,12 @@ typedef void (table_header_ftype) (struct ui_out * uiout, int width,
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enum ui_align align,
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const std::string &col_name,
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const std::string &col_hdr);
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/* Note: level 0 is the top-level so LEVEL is always greater than
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zero. */
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typedef void (ui_out_begin_ftype) (struct ui_out *uiout,
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enum ui_out_type type,
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int level, const char *id);
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const char *id);
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typedef void (ui_out_end_ftype) (struct ui_out *uiout,
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enum ui_out_type type,
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int level);
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enum ui_out_type type);
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typedef void (field_int_ftype) (struct ui_out * uiout, int fldno, int width,
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enum ui_align align,
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const char *fldname, int value);
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