gdb/ui-out.h

   1 /* Output generating routines for GDB.
   2
   3    Copyright (C) 1999-2018 Free Software Foundation, Inc.
   4
   5    Contributed by Cygnus Solutions.
   6    Written by Fernando Nasser for Cygnus.
   7
   8    This file is part of GDB.
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  22
  23 #ifndef UI_OUT_H
  24 #define UI_OUT_H 1
  25
  26 #include <vector>
  27
  28 #include "common/enum-flags.h"
  29
  30 class ui_out_level;
  31 class ui_out_table;
  32 struct ui_file;
  33
  34 /* the current ui_out */
  35
  36 /* FIXME: This should not be a global but something passed down from main.c
  37    or top.c.  */
  38 extern struct ui_out **current_ui_current_uiout_ptr (void);
  39 #define current_uiout (*current_ui_current_uiout_ptr ())
  40
  41 /* alignment enum */
  42 enum ui_align
  43   {
  44     ui_left = -1,
  45     ui_center,
  46     ui_right,
  47     ui_noalign
  48   };
  49
  50 /* flags enum */
  51 enum ui_out_flag
  52   {
  53     ui_source_list = (1 << 0),
  54   };
  55
  56 DEF_ENUM_FLAGS_TYPE (ui_out_flag, ui_out_flags);
  57
  58 /* Prototypes for ui-out API.  */
  59
  60 /* A result is a recursive data structure consisting of lists and
  61    tuples.  */
  62
  63 enum ui_out_type
  64   {
  65     ui_out_type_tuple,
  66     ui_out_type_list
  67   };
  68
  69 class ui_out
  70 {
  71  public:
  72
  73   explicit ui_out (ui_out_flags flags = 0);
  74   virtual ~ui_out ();
  75
  76   void push_level (ui_out_type type);
  77   void pop_level (ui_out_type type);
  78
  79   /* A table can be considered a special tuple/list combination with the
  80      implied structure: ``table = { hdr = { header, ... } , body = [ {
  81      field, ... }, ... ] }''.  If NR_ROWS is negative then there is at
  82      least one row.  */
  83
  84   void table_begin (int nr_cols, int nr_rows, const std::string &tblid);
  85   void table_header (int width, ui_align align, const std::string &col_name,
  86                      const std::string &col_hdr);
  87   void table_body ();
  88   void table_end ();
  89
  90   void begin (ui_out_type type, const char *id);
  91   void end (ui_out_type type);
  92
  93   void field_int (const char *fldname, int value);
  94   void field_fmt_int (int width, ui_align align, const char *fldname,
  95                       int value);
  96   void field_core_addr (const char *fldname, struct gdbarch *gdbarch,
  97                         CORE_ADDR address);
  98   void field_string (const char *fldname, const char *string);
  99   void field_string (const char *fldname, const std::string &string);
 100   void field_stream (const char *fldname, string_file &stream);
 101   void field_skip (const char *fldname);
 102   void field_fmt (const char *fldname, const char *format, ...)
 103     ATTRIBUTE_PRINTF (3, 4);
 104
 105   void spaces (int numspaces);
 106   void text (const char *string);
 107   void message (const char *format, ...) ATTRIBUTE_PRINTF (2, 3);
 108   void wrap_hint (const char *identstring);
 109
 110   void flush ();
 111
 112   /* Redirect the output of a ui_out object temporarily.  */
 113   void redirect (ui_file *outstream);
 114
 115   ui_out_flags test_flags (ui_out_flags mask);
 116
 117   /* HACK: Code in GDB is currently checking to see the type of ui_out
 118      builder when determining which output to produce.  This function is
 119      a hack to encapsulate that test.  Once GDB manages to separate the
 120      CLI/MI from the core of GDB the problem should just go away ....  */
 121
 122   bool is_mi_like_p () const;
 123
 124   bool query_table_field (int colno, int *width, int *alignment,
 125                           const char **col_name);
 126
 127  protected:
 128
 129   virtual void do_table_begin (int nbrofcols, int nr_rows, const char *tblid)
 130     = 0;
 131   virtual void do_table_body () = 0;
 132   virtual void do_table_end () = 0;
 133   virtual void do_table_header (int width, ui_align align,
 134                                 const std::string &col_name,
 135                                 const std::string &col_hdr) = 0;
 136
 137   virtual void do_begin (ui_out_type type, const char *id) = 0;
 138   virtual void do_end (ui_out_type type) = 0;
 139   virtual void do_field_int (int fldno, int width, ui_align align,
 140                              const char *fldname, int value) = 0;
 141   virtual void do_field_skip (int fldno, int width, ui_align align,
 142                               const char *fldname) = 0;
 143   virtual void do_field_string (int fldno, int width, ui_align align,
 144                                 const char *fldname, const char *string) = 0;
 145   virtual void do_field_fmt (int fldno, int width, ui_align align,
 146                              const char *fldname, const char *format,
 147                              va_list args)
 148     ATTRIBUTE_PRINTF (6,0) = 0;
 149   virtual void do_spaces (int numspaces) = 0;
 150   virtual void do_text (const char *string) = 0;
 151   virtual void do_message (const char *format, va_list args)
 152     ATTRIBUTE_PRINTF (2,0) = 0;
 153   virtual void do_wrap_hint (const char *identstring) = 0;
 154   virtual void do_flush () = 0;
 155   virtual void do_redirect (struct ui_file *outstream) = 0;
 156
 157   /* Set as not MI-like by default.  It is overridden in subclasses if
 158      necessary.  */
 159
 160   virtual bool do_is_mi_like_p () const
 161   { return false; }
 162
 163  private:
 164
 165   ui_out_flags m_flags;
 166
 167   /* Vector to store and track the ui-out levels.  */
 168   std::vector<std::unique_ptr<ui_out_level>> m_levels;
 169
 170   /* A table, if any.  At present only a single table is supported.  */
 171   std::unique_ptr<ui_out_table> m_table_up;
 172
 173   void verify_field (int *fldno, int *width, ui_align *align);
 174
 175   int level () const;
 176   ui_out_level *current_level () const;
 177 };
 178
 179 /* This is similar to make_cleanup_ui_out_tuple_begin_end and
 180    make_cleanup_ui_out_list_begin_end, but written as an RAII template
 181    class.  It takes the ui_out_type as a template parameter.  Normally
 182    this is used via the typedefs ui_out_emit_tuple and
 183    ui_out_emit_list.  */
 184 template<ui_out_type Type>
 185 class ui_out_emit_type
 186 {
 187 public:
 188
 189   ui_out_emit_type (struct ui_out *uiout, const char *id)
 190     : m_uiout (uiout)
 191   {
 192     uiout->begin (Type, id);
 193   }
 194
 195   ~ui_out_emit_type ()
 196   {
 197     m_uiout->end (Type);
 198   }
 199
 200   DISABLE_COPY_AND_ASSIGN (ui_out_emit_type<Type>);
 201
 202 private:
 203
 204   struct ui_out *m_uiout;
 205 };
 206
 207 typedef ui_out_emit_type<ui_out_type_tuple> ui_out_emit_tuple;
 208 typedef ui_out_emit_type<ui_out_type_list> ui_out_emit_list;
 209
 210 /* Start a new table on construction, and end the table on
 211    destruction.  */
 212 class ui_out_emit_table
 213 {
 214 public:
 215
 216   ui_out_emit_table (struct ui_out *uiout, int nr_cols, int nr_rows,
 217                      const char *tblid)
 218     : m_uiout (uiout)
 219   {
 220     m_uiout->table_begin (nr_cols, nr_rows, tblid);
 221   }
 222
 223   ~ui_out_emit_table ()
 224   {
 225     m_uiout->table_end ();
 226   }
 227
 228   ui_out_emit_table (const ui_out_emit_table &) = delete;
 229   ui_out_emit_table &operator= (const ui_out_emit_table &) = delete;
 230
 231 private:
 232
 233   struct ui_out *m_uiout;
 234 };
 235
 236 /* On destruction, pop the last redirection by calling the uiout's
 237    redirect method with a NULL parameter.  */
 238 class ui_out_redirect_pop
 239 {
 240 public:
 241
 242   ui_out_redirect_pop (ui_out *uiout)
 243     : m_uiout (uiout)
 244   {
 245   }
 246
 247   ~ui_out_redirect_pop ()
 248   {
 249     m_uiout->redirect (NULL);
 250   }
 251
 252   ui_out_redirect_pop (const ui_out_redirect_pop &) = delete;
 253   ui_out_redirect_pop &operator= (const ui_out_redirect_pop &) = delete;
 254
 255 private:
 256   struct ui_out *m_uiout;
 257 };
 258
 259 #endif /* UI_OUT_H */