gcc/dump-context.h

   1 /* Support code for handling the various dump_* calls in dumpfile.h
   2    Copyright (C) 2018-2021 Free Software Foundation, Inc.
   3    Contributed by David Malcolm <dmalcolm@redhat.com>.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 3, or (at your option)
  10 any later version.
  11
  12 GCC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21
  22 #ifndef GCC_DUMP_CONTEXT_H
  23 #define GCC_DUMP_CONTEXT_H 1
  24
  25 #include "dumpfile.h"
  26 #include "pretty-print.h"
  27 #include "selftest.h"
  28 #include "optinfo.h"
  29
  30 class optrecord_json_writer;
  31 namespace selftest { class temp_dump_context; }
  32 class debug_dump_context;
  33
  34 /* A class for handling the various dump_* calls.
  35
  36    In particular, this class has responsibility for consolidating
  37    the "dump_*" calls into optinfo instances (delimited by "dump_*_loc"
  38    calls), and emitting them.
  39
  40    Putting this in a class (rather than as global state) allows
  41    for selftesting of this code.  */
  42
  43 class dump_context
  44 {
  45   friend class selftest::temp_dump_context;
  46   friend class debug_dump_context;
  47
  48  public:
  49   static dump_context &get () { return *s_current; }
  50
  51   ~dump_context ();
  52
  53   void refresh_dumps_are_enabled ();
  54
  55   void dump_loc (const dump_metadata_t &metadata,
  56                  const dump_user_location_t &loc);
  57   void dump_loc_immediate (dump_flags_t dump_kind,
  58                            const dump_user_location_t &loc);
  59
  60   void dump_gimple_stmt (const dump_metadata_t &metadata,
  61                          dump_flags_t extra_dump_flags,
  62                          gimple *gs, int spc);
  63
  64   void dump_gimple_stmt_loc (const dump_metadata_t &metadata,
  65                              const dump_user_location_t &loc,
  66                              dump_flags_t extra_dump_flags,
  67                              gimple *gs, int spc);
  68
  69   void dump_gimple_expr (const dump_metadata_t &metadata,
  70                          dump_flags_t extra_dump_flags,
  71                          gimple *gs, int spc);
  72
  73   void dump_gimple_expr_loc (const dump_metadata_t &metadata,
  74                              const dump_user_location_t &loc,
  75                              dump_flags_t extra_dump_flags,
  76                              gimple *gs,
  77                              int spc);
  78
  79   void dump_generic_expr (const dump_metadata_t &metadata,
  80                           dump_flags_t extra_dump_flags,
  81                           tree t);
  82
  83   void dump_generic_expr_loc (const dump_metadata_t &metadata,
  84                               const dump_user_location_t &loc,
  85                               dump_flags_t extra_dump_flags,
  86                               tree t);
  87
  88   void dump_printf_va (const dump_metadata_t &metadata, const char *format,
  89                        va_list *ap) ATTRIBUTE_GCC_DUMP_PRINTF (3, 0);
  90
  91   void dump_printf_loc_va (const dump_metadata_t &metadata,
  92                            const dump_user_location_t &loc,
  93                            const char *format, va_list *ap)
  94     ATTRIBUTE_GCC_DUMP_PRINTF (4, 0);
  95
  96   template<unsigned int N, typename C>
  97   void dump_dec (const dump_metadata_t &metadata, const poly_int<N, C> &value);
  98
  99   void dump_symtab_node (const dump_metadata_t &metadata, symtab_node *node);
 100
 101   /* Managing nested scopes.  */
 102   unsigned int get_scope_depth () const;
 103   void begin_scope (const char *name,
 104                     const dump_user_location_t &user_location,
 105                     const dump_impl_location_t &impl_location);
 106   void end_scope ();
 107
 108   /* Should optinfo instances be created?
 109      All creation of optinfos should be guarded by this predicate.
 110      Return true if any optinfo destinations are active.  */
 111   bool optinfo_enabled_p () const;
 112
 113   bool optimization_records_enabled_p () const
 114   {
 115     return m_json_writer != NULL;
 116   }
 117   void set_json_writer (optrecord_json_writer *writer);
 118   void finish_any_json_writer ();
 119
 120   void end_any_optinfo ();
 121
 122   void emit_optinfo (const optinfo *info);
 123   void emit_item (optinfo_item *item, dump_flags_t dump_kind);
 124
 125   bool apply_dump_filter_p (dump_flags_t dump_kind, dump_flags_t filter) const;
 126
 127  private:
 128   optinfo &ensure_pending_optinfo (const dump_metadata_t &metadata);
 129   optinfo &begin_next_optinfo (const dump_metadata_t &metadata,
 130                                const dump_user_location_t &loc);
 131
 132   /* The current nesting depth of dump scopes, for showing nesting
 133      via indentation).  */
 134   unsigned int m_scope_depth;
 135
 136   /* The optinfo currently being accumulated since the last dump_*_loc call,
 137      if any.  */
 138   optinfo *m_pending;
 139
 140   /* If -fsave-optimization-record is enabled, the heap-allocated JSON writer
 141      instance, otherwise NULL.  */
 142   optrecord_json_writer *m_json_writer;
 143
 144   /* For use in selftests: if non-NULL, then items are to be printed
 145      to this, using the given flags.  */
 146   pretty_printer *m_test_pp;
 147   dump_flags_t m_test_pp_flags;
 148
 149   /* The currently active dump_context, for use by the dump_* API calls.  */
 150   static dump_context *s_current;
 151
 152   /* The default active context.  */
 153   static dump_context s_default;
 154 };
 155
 156 /* A subclass of pretty_printer for implementing dump_context::dump_printf_va.
 157    In particular, the formatted chunks are captured as optinfo_item instances,
 158    thus retaining metadata about the entities being dumped (e.g. source
 159    locations), rather than just as plain text.  */
 160
 161 class dump_pretty_printer : public pretty_printer
 162 {
 163 public:
 164   dump_pretty_printer (dump_context *context, dump_flags_t dump_kind);
 165
 166   void emit_items (optinfo *dest);
 167
 168 private:
 169   /* Information on an optinfo_item that was generated during phase 2 of
 170      formatting.  */
 171   class stashed_item
 172   {
 173   public:
 174     stashed_item (const char **buffer_ptr_, optinfo_item *item_)
 175       : buffer_ptr (buffer_ptr_), item (item_) {}
 176     const char **buffer_ptr;
 177     optinfo_item *item;
 178   };
 179
 180   static bool format_decoder_cb (pretty_printer *pp, text_info *text,
 181                                  const char *spec, int /*precision*/,
 182                                  bool /*wide*/, bool /*set_locus*/,
 183                                  bool /*verbose*/, bool */*quoted*/,
 184                                  const char **buffer_ptr);
 185
 186   bool decode_format (text_info *text, const char *spec,
 187                       const char **buffer_ptr);
 188
 189   void stash_item (const char **buffer_ptr, optinfo_item *item);
 190
 191   void emit_any_pending_textual_chunks (optinfo *dest);
 192
 193   void emit_item (optinfo_item *item, optinfo *dest);
 194
 195   dump_context *m_context;
 196   dump_flags_t m_dump_kind;
 197   auto_vec<stashed_item> m_stashed_items;
 198 };
 199
 200 /* An RAII-style class for use in debug dumpers for temporarily using a
 201    different dump_context.  It enables full details and outputs to
 202    stderr instead of the currently active dump_file.  */
 203
 204 class debug_dump_context
 205 {
 206  public:
 207   debug_dump_context ();
 208   ~debug_dump_context ();
 209
 210  private:
 211   dump_context m_context;
 212   dump_context *m_saved;
 213   dump_flags_t m_saved_flags;
 214   dump_flags_t m_saved_pflags;
 215   FILE *m_saved_file;
 216 };
 217
 218
 219 #if CHECKING_P
 220
 221 namespace selftest {
 222
 223 /* An RAII-style class for use in selftests for temporarily using a different
 224    dump_context.  */
 225
 226 class temp_dump_context
 227 {
 228  public:
 229   temp_dump_context (bool forcibly_enable_optinfo,
 230                      bool forcibly_enable_dumping,
 231                      dump_flags_t test_pp_flags);
 232   ~temp_dump_context ();
 233
 234   /* Support for selftests.  */
 235   optinfo *get_pending_optinfo () const { return m_context.m_pending; }
 236   const char *get_dumped_text ();
 237
 238  private:
 239   pretty_printer m_pp;
 240   dump_context m_context;
 241   dump_context *m_saved;
 242 };
 243
 244 /* Implementation detail of ASSERT_DUMPED_TEXT_EQ.  */
 245
 246 extern void verify_dumped_text (const location &loc,
 247                                 temp_dump_context *context,
 248                                 const char *expected_text);
 249
 250 /* Verify that the text dumped so far in CONTEXT equals
 251    EXPECTED_TEXT.
 252    As a side-effect, the internal buffer is 0-terminated.  */
 253
 254 #define ASSERT_DUMPED_TEXT_EQ(CONTEXT, EXPECTED_TEXT)                   \
 255   SELFTEST_BEGIN_STMT                                                   \
 256     verify_dumped_text (SELFTEST_LOCATION, &(CONTEXT), (EXPECTED_TEXT)); \
 257   SELFTEST_END_STMT
 258
 259
 260 /* Verify that ITEM has the expected values.  */
 261
 262 void
 263 verify_item (const location &loc,
 264              const optinfo_item *item,
 265              enum optinfo_item_kind expected_kind,
 266              location_t expected_location,
 267              const char *expected_text);
 268
 269 /* Verify that ITEM is a text item, with EXPECTED_TEXT.  */
 270
 271 #define ASSERT_IS_TEXT(ITEM, EXPECTED_TEXT) \
 272   SELFTEST_BEGIN_STMT                                               \
 273     verify_item (SELFTEST_LOCATION, (ITEM), OPTINFO_ITEM_KIND_TEXT, \
 274                  UNKNOWN_LOCATION, (EXPECTED_TEXT));                \
 275   SELFTEST_END_STMT
 276
 277 /* Verify that ITEM is a tree item, with the expected values.  */
 278
 279 #define ASSERT_IS_TREE(ITEM, EXPECTED_LOCATION, EXPECTED_TEXT) \
 280   SELFTEST_BEGIN_STMT                                               \
 281     verify_item (SELFTEST_LOCATION, (ITEM), OPTINFO_ITEM_KIND_TREE, \
 282                  (EXPECTED_LOCATION), (EXPECTED_TEXT));     \
 283   SELFTEST_END_STMT
 284
 285 /* Verify that ITEM is a gimple item, with the expected values.  */
 286
 287 #define ASSERT_IS_GIMPLE(ITEM, EXPECTED_LOCATION, EXPECTED_TEXT) \
 288   SELFTEST_BEGIN_STMT                                               \
 289     verify_item (SELFTEST_LOCATION, (ITEM), OPTINFO_ITEM_KIND_GIMPLE, \
 290                  (EXPECTED_LOCATION), (EXPECTED_TEXT));     \
 291   SELFTEST_END_STMT
 292
 293 /* Verify that ITEM is a symtab node, with the expected values.  */
 294
 295 #define ASSERT_IS_SYMTAB_NODE(ITEM, EXPECTED_LOCATION, EXPECTED_TEXT) \
 296   SELFTEST_BEGIN_STMT                                               \
 297     verify_item (SELFTEST_LOCATION, (ITEM), OPTINFO_ITEM_KIND_SYMTAB_NODE, \
 298                  (EXPECTED_LOCATION), (EXPECTED_TEXT));     \
 299   SELFTEST_END_STMT
 300
 301 } // namespace selftest
 302
 303 #endif /* CHECKING_P */
 304
 305 #endif /* GCC_DUMP_CONTEXT_H */