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