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