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