gdb/ui-out.h

   1 /* Output generating routines for GDB.
   2
   3    Copyright (C) 1999-2019 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 "gdbsupport/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   fix_multi_location_breakpoint_output = (1 << 1),
  55 };
  56
  57 DEF_ENUM_FLAGS_TYPE (ui_out_flag, ui_out_flags);
  58
  59 /* Prototypes for ui-out API.  */
  60
  61 /* A result is a recursive data structure consisting of lists and
  62    tuples.  */
  63
  64 enum ui_out_type
  65   {
  66     ui_out_type_tuple,
  67     ui_out_type_list
  68   };
  69
  70 /* Possible kinds of styling.  */
  71
  72 enum class ui_out_style_kind
  73 {
  74   /* The default (plain) style.  */
  75   DEFAULT,
  76   /* File name.  */
  77   FILE,
  78   /* Function name.  */
  79   FUNCTION,
  80   /* Variable name.  */
  81   VARIABLE,
  82   /* Address.  */
  83   ADDRESS
  84 };
  85
  86 class ui_out
  87 {
  88  public:
  89
  90   explicit ui_out (ui_out_flags flags = 0);
  91   virtual ~ui_out ();
  92
  93   void push_level (ui_out_type type);
  94   void pop_level (ui_out_type type);
  95
  96   /* A table can be considered a special tuple/list combination with the
  97      implied structure: ``table = { hdr = { header, ... } , body = [ {
  98      field, ... }, ... ] }''.  If NR_ROWS is negative then there is at
  99      least one row.  */
 100
 101   void table_begin (int nr_cols, int nr_rows, const std::string &tblid);
 102   void table_header (int width, ui_align align, const std::string &col_name,
 103                      const std::string &col_hdr);
 104   void table_body ();
 105   void table_end ();
 106
 107   void begin (ui_out_type type, const char *id);
 108   void end (ui_out_type type);
 109
 110   void field_signed (const char *fldname, LONGEST value);
 111   void field_fmt_signed (int width, ui_align align, const char *fldname,
 112                          LONGEST value);
 113   /* Like field_signed, but print an unsigned value.  */
 114   void field_unsigned (const char *fldname, ULONGEST value);
 115   void field_core_addr (const char *fldname, struct gdbarch *gdbarch,
 116                         CORE_ADDR address);
 117   void field_string (const char *fldname, const char *string,
 118                      ui_out_style_kind style = ui_out_style_kind::DEFAULT);
 119   void field_string (const char *fldname, const std::string &string);
 120   void field_stream (const char *fldname, string_file &stream,
 121                      ui_out_style_kind style = ui_out_style_kind::DEFAULT);
 122   void field_skip (const char *fldname);
 123   void field_fmt (const char *fldname, const char *format, ...)
 124     ATTRIBUTE_PRINTF (3, 4);
 125
 126   void spaces (int numspaces);
 127   void text (const char *string);
 128   void message (const char *format, ...) ATTRIBUTE_PRINTF (2, 3);
 129   void wrap_hint (const char *identstring);
 130
 131   void flush ();
 132
 133   /* Redirect the output of a ui_out object temporarily.  */
 134   void redirect (ui_file *outstream);
 135
 136   ui_out_flags test_flags (ui_out_flags mask);
 137
 138   /* HACK: Code in GDB is currently checking to see the type of ui_out
 139      builder when determining which output to produce.  This function is
 140      a hack to encapsulate that test.  Once GDB manages to separate the
 141      CLI/MI from the core of GDB the problem should just go away ....  */
 142
 143   bool is_mi_like_p () const;
 144
 145   bool query_table_field (int colno, int *width, int *alignment,
 146                           const char **col_name);
 147
 148   /* Return true if this stream is prepared to handle style
 149      escapes.  */
 150   virtual bool can_emit_style_escape () const = 0;
 151
 152  protected:
 153
 154   virtual void do_table_begin (int nbrofcols, int nr_rows, const char *tblid)
 155     = 0;
 156   virtual void do_table_body () = 0;
 157   virtual void do_table_end () = 0;
 158   virtual void do_table_header (int width, ui_align align,
 159                                 const std::string &col_name,
 160                                 const std::string &col_hdr) = 0;
 161
 162   virtual void do_begin (ui_out_type type, const char *id) = 0;
 163   virtual void do_end (ui_out_type type) = 0;
 164   virtual void do_field_signed (int fldno, int width, ui_align align,
 165                                 const char *fldname, LONGEST value) = 0;
 166   virtual void do_field_unsigned (int fldno, int width, ui_align align,
 167                                   const char *fldname, ULONGEST value) = 0;
 168   virtual void do_field_skip (int fldno, int width, ui_align align,
 169                               const char *fldname) = 0;
 170   virtual void do_field_string (int fldno, int width, ui_align align,
 171                                 const char *fldname, const char *string,
 172                                 ui_out_style_kind style) = 0;
 173   virtual void do_field_fmt (int fldno, int width, ui_align align,
 174                              const char *fldname, const char *format,
 175                              va_list args)
 176     ATTRIBUTE_PRINTF (6,0) = 0;
 177   virtual void do_spaces (int numspaces) = 0;
 178   virtual void do_text (const char *string) = 0;
 179   virtual void do_message (const char *format, va_list args)
 180     ATTRIBUTE_PRINTF (2,0) = 0;
 181   virtual void do_wrap_hint (const char *identstring) = 0;
 182   virtual void do_flush () = 0;
 183   virtual void do_redirect (struct ui_file *outstream) = 0;
 184
 185   /* Set as not MI-like by default.  It is overridden in subclasses if
 186      necessary.  */
 187
 188   virtual bool do_is_mi_like_p () const
 189   { return false; }
 190
 191  private:
 192
 193   ui_out_flags m_flags;
 194
 195   /* Vector to store and track the ui-out levels.  */
 196   std::vector<std::unique_ptr<ui_out_level>> m_levels;
 197
 198   /* A table, if any.  At present only a single table is supported.  */
 199   std::unique_ptr<ui_out_table> m_table_up;
 200
 201   void verify_field (int *fldno, int *width, ui_align *align);
 202
 203   int level () const;
 204   ui_out_level *current_level () const;
 205 };
 206
 207 /* Start a new tuple or list on construction, and end it on
 208    destruction.  Normally this is used via the typedefs
 209    ui_out_emit_tuple and ui_out_emit_list.  */
 210 template<ui_out_type Type>
 211 class ui_out_emit_type
 212 {
 213 public:
 214
 215   ui_out_emit_type (struct ui_out *uiout, const char *id)
 216     : m_uiout (uiout)
 217   {
 218     uiout->begin (Type, id);
 219   }
 220
 221   ~ui_out_emit_type ()
 222   {
 223     m_uiout->end (Type);
 224   }
 225
 226   DISABLE_COPY_AND_ASSIGN (ui_out_emit_type<Type>);
 227
 228 private:
 229
 230   struct ui_out *m_uiout;
 231 };
 232
 233 typedef ui_out_emit_type<ui_out_type_tuple> ui_out_emit_tuple;
 234 typedef ui_out_emit_type<ui_out_type_list> ui_out_emit_list;
 235
 236 /* Start a new table on construction, and end the table on
 237    destruction.  */
 238 class ui_out_emit_table
 239 {
 240 public:
 241
 242   ui_out_emit_table (struct ui_out *uiout, int nr_cols, int nr_rows,
 243                      const char *tblid)
 244     : m_uiout (uiout)
 245   {
 246     m_uiout->table_begin (nr_cols, nr_rows, tblid);
 247   }
 248
 249   ~ui_out_emit_table ()
 250   {
 251     m_uiout->table_end ();
 252   }
 253
 254   ui_out_emit_table (const ui_out_emit_table &) = delete;
 255   ui_out_emit_table &operator= (const ui_out_emit_table &) = delete;
 256
 257 private:
 258
 259   struct ui_out *m_uiout;
 260 };
 261
 262 /* On destruction, pop the last redirection by calling the uiout's
 263    redirect method with a NULL parameter.  */
 264 class ui_out_redirect_pop
 265 {
 266 public:
 267
 268   ui_out_redirect_pop (ui_out *uiout)
 269     : m_uiout (uiout)
 270   {
 271   }
 272
 273   ~ui_out_redirect_pop ()
 274   {
 275     m_uiout->redirect (NULL);
 276   }
 277
 278   ui_out_redirect_pop (const ui_out_redirect_pop &) = delete;
 279   ui_out_redirect_pop &operator= (const ui_out_redirect_pop &) = delete;
 280
 281 private:
 282   struct ui_out *m_uiout;
 283 };
 284
 285 #endif /* UI_OUT_H */