gdb/buildsym.h

   1 /* Build symbol tables in GDB's internal format.
   2    Copyright (C) 1986-2020 Free Software Foundation, Inc.
   3
   4    This file is part of GDB.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #if !defined (BUILDSYM_H)
  20 #define BUILDSYM_H 1
  21
  22 #include "gdb_obstack.h"
  23
  24 struct objfile;
  25 struct symbol;
  26 struct addrmap;
  27 struct compunit_symtab;
  28 enum language;
  29
  30 /* This module provides definitions used for creating and adding to
  31    the symbol table.  These routines are called from various symbol-
  32    file-reading routines.
  33
  34    They originated in dbxread.c of gdb-4.2, and were split out to
  35    make xcoffread.c more maintainable by sharing code.  */
  36
  37 struct block;
  38 struct pending_block;
  39
  40 struct dynamic_prop;
  41
  42 /* The list of sub-source-files within the current individual
  43    compilation.  Each file gets its own symtab with its own linetable
  44    and associated info, but they all share one blockvector.  */
  45
  46 struct subfile
  47 {
  48   struct subfile *next;
  49   /* Space for this is malloc'd.  */
  50   char *name;
  51   /* Space for this is malloc'd.  */
  52   struct linetable *line_vector;
  53   int line_vector_length;
  54   /* The "containing" compunit.  */
  55   struct buildsym_compunit *buildsym_compunit;
  56   enum language language;
  57   struct symtab *symtab;
  58 };
  59
  60 /* Record the symbols defined for each context in a list.  We don't
  61    create a struct block for the context until we know how long to
  62    make it.  */
  63
  64 #define PENDINGSIZE 100
  65
  66 struct pending
  67   {
  68     struct pending *next;
  69     int nsyms;
  70     struct symbol *symbol[PENDINGSIZE];
  71   };
  72
  73 /* Stack representing unclosed lexical contexts (that will become
  74    blocks, eventually).  */
  75
  76 struct context_stack
  77   {
  78     /* Outer locals at the time we entered */
  79
  80     struct pending *locals;
  81
  82     /* Pending using directives at the time we entered.  */
  83
  84     struct using_direct *local_using_directives;
  85
  86     /* Pointer into blocklist as of entry */
  87
  88     struct pending_block *old_blocks;
  89
  90     /* Name of function, if any, defining context */
  91
  92     struct symbol *name;
  93
  94     /* Expression that computes the frame base of the lexically enclosing
  95        function, if any.  NULL otherwise.  */
  96
  97     struct dynamic_prop *static_link;
  98
  99     /* PC where this context starts */
 100
 101     CORE_ADDR start_addr;
 102
 103     /* Temp slot for exception handling.  */
 104
 105     CORE_ADDR end_addr;
 106
 107     /* For error-checking matching push/pop */
 108
 109     int depth;
 110
 111   };
 112
 113 /* Buildsym's counterpart to struct compunit_symtab.  */
 114
 115 struct buildsym_compunit
 116 {
 117   /* Start recording information about a primary source file (IOW, not an
 118      included source file).
 119      COMP_DIR is the directory in which the compilation unit was compiled
 120      (or NULL if not known).  */
 121
 122   buildsym_compunit (struct objfile *objfile_, const char *name,
 123                      const char *comp_dir_, enum language language_,
 124                      CORE_ADDR last_addr);
 125
 126   /* Reopen an existing compunit_symtab so that additional symbols can
 127      be added to it.  Arguments are as for the main constructor.  CUST
 128      is the expandable compunit_symtab to be reopened.  */
 129
 130   buildsym_compunit (struct objfile *objfile_, const char *name,
 131                      const char *comp_dir_, enum language language_,
 132                      CORE_ADDR last_addr, struct compunit_symtab *cust)
 133     : m_objfile (objfile_),
 134       m_last_source_file (name == nullptr ? nullptr : xstrdup (name)),
 135       m_comp_dir (comp_dir_ == nullptr ? nullptr : xstrdup (comp_dir_)),
 136       m_compunit_symtab (cust),
 137       m_language (language_),
 138       m_last_source_start_addr (last_addr)
 139   {
 140   }
 141
 142   ~buildsym_compunit ();
 143
 144   DISABLE_COPY_AND_ASSIGN (buildsym_compunit);
 145
 146   void set_last_source_file (const char *name)
 147   {
 148     char *new_name = name == NULL ? NULL : xstrdup (name);
 149     m_last_source_file.reset (new_name);
 150   }
 151
 152   const char *get_last_source_file ()
 153   {
 154     return m_last_source_file.get ();
 155   }
 156
 157   struct macro_table *get_macro_table ();
 158
 159   struct macro_table *release_macros ()
 160   {
 161     struct macro_table *result = m_pending_macros;
 162     m_pending_macros = nullptr;
 163     return result;
 164   }
 165
 166   /* This function is called to discard any pending blocks.  */
 167
 168   void free_pending_blocks ()
 169   {
 170     m_pending_block_obstack.clear ();
 171     m_pending_blocks = nullptr;
 172   }
 173
 174   struct block *finish_block (struct symbol *symbol,
 175                               struct pending_block *old_blocks,
 176                               const struct dynamic_prop *static_link,
 177                               CORE_ADDR start, CORE_ADDR end);
 178
 179   void record_block_range (struct block *block,
 180                            CORE_ADDR start, CORE_ADDR end_inclusive);
 181
 182   void start_subfile (const char *name);
 183
 184   void patch_subfile_names (struct subfile *subfile, const char *name);
 185
 186   void push_subfile ();
 187
 188   const char *pop_subfile ();
 189
 190   void record_line (struct subfile *subfile, int line, CORE_ADDR pc,
 191                     bool is_stmt);
 192
 193   struct compunit_symtab *get_compunit_symtab ()
 194   {
 195     return m_compunit_symtab;
 196   }
 197
 198   void set_last_source_start_addr (CORE_ADDR addr)
 199   {
 200     m_last_source_start_addr = addr;
 201   }
 202
 203   CORE_ADDR get_last_source_start_addr ()
 204   {
 205     return m_last_source_start_addr;
 206   }
 207
 208   struct using_direct **get_local_using_directives ()
 209   {
 210     return &m_local_using_directives;
 211   }
 212
 213   void set_local_using_directives (struct using_direct *new_local)
 214   {
 215     m_local_using_directives = new_local;
 216   }
 217
 218   struct using_direct **get_global_using_directives ()
 219   {
 220     return &m_global_using_directives;
 221   }
 222
 223   bool outermost_context_p () const
 224   {
 225     return m_context_stack.empty ();
 226   }
 227
 228   struct context_stack *get_current_context_stack ()
 229   {
 230     if (m_context_stack.empty ())
 231       return nullptr;
 232     return &m_context_stack.back ();
 233   }
 234
 235   int get_context_stack_depth () const
 236   {
 237     return m_context_stack.size ();
 238   }
 239
 240   struct subfile *get_current_subfile ()
 241   {
 242     return m_current_subfile;
 243   }
 244
 245   struct pending **get_local_symbols ()
 246   {
 247     return &m_local_symbols;
 248   }
 249
 250   struct pending **get_file_symbols ()
 251   {
 252     return &m_file_symbols;
 253   }
 254
 255   struct pending **get_global_symbols ()
 256   {
 257     return &m_global_symbols;
 258   }
 259
 260   void record_debugformat (const char *format)
 261   {
 262     m_debugformat = format;
 263   }
 264
 265   void record_producer (const char *producer)
 266   {
 267     m_producer = producer;
 268   }
 269
 270   struct context_stack *push_context (int desc, CORE_ADDR valu);
 271
 272   struct context_stack pop_context ();
 273
 274   struct block *end_symtab_get_static_block (CORE_ADDR end_addr,
 275                                              int expandable, int required);
 276
 277   struct compunit_symtab *end_symtab_from_static_block
 278       (struct block *static_block, int section, int expandable);
 279
 280   struct compunit_symtab *end_symtab (CORE_ADDR end_addr, int section);
 281
 282   struct compunit_symtab *end_expandable_symtab (CORE_ADDR end_addr,
 283                                                  int section);
 284
 285   void augment_type_symtab ();
 286
 287 private:
 288
 289   void record_pending_block (struct block *block, struct pending_block *opblock);
 290
 291   struct block *finish_block_internal (struct symbol *symbol,
 292                                        struct pending **listhead,
 293                                        struct pending_block *old_blocks,
 294                                        const struct dynamic_prop *static_link,
 295                                        CORE_ADDR start, CORE_ADDR end,
 296                                        int is_global, int expandable);
 297
 298   struct blockvector *make_blockvector ();
 299
 300   void watch_main_source_file_lossage ();
 301
 302   struct compunit_symtab *end_symtab_with_blockvector
 303       (struct block *static_block, int section, int expandable);
 304
 305   /* The objfile we're reading debug info from.  */
 306   struct objfile *m_objfile;
 307
 308   /* List of subfiles (source files).
 309      Files are added to the front of the list.
 310      This is important mostly for the language determination hacks we use,
 311      which iterate over previously added files.  */
 312   struct subfile *m_subfiles = nullptr;
 313
 314   /* The subfile of the main source file.  */
 315   struct subfile *m_main_subfile = nullptr;
 316
 317   /* Name of source file whose symbol data we are now processing.  This
 318      comes from a symbol of type N_SO for stabs.  For DWARF it comes
 319      from the DW_AT_name attribute of a DW_TAG_compile_unit DIE.  */
 320   gdb::unique_xmalloc_ptr<char> m_last_source_file;
 321
 322   /* E.g., DW_AT_comp_dir if DWARF.  Space for this is malloc'd.  */
 323   gdb::unique_xmalloc_ptr<char> m_comp_dir;
 324
 325   /* Space for this is not malloc'd, and is assumed to have at least
 326      the same lifetime as objfile.  */
 327   const char *m_producer = nullptr;
 328
 329   /* Space for this is not malloc'd, and is assumed to have at least
 330      the same lifetime as objfile.  */
 331   const char *m_debugformat = nullptr;
 332
 333   /* The compunit we are building.  */
 334   struct compunit_symtab *m_compunit_symtab = nullptr;
 335
 336   /* Language of this compunit_symtab.  */
 337   enum language m_language;
 338
 339   /* The macro table for the compilation unit whose symbols we're
 340      currently reading.  */
 341   struct macro_table *m_pending_macros = nullptr;
 342
 343   /* True if symtab has line number info.  This prevents an otherwise
 344      empty symtab from being tossed.  */
 345   bool m_have_line_numbers = false;
 346
 347   /* Core address of start of text of current source file.  This too
 348      comes from the N_SO symbol.  For Dwarf it typically comes from the
 349      DW_AT_low_pc attribute of a DW_TAG_compile_unit DIE.  */
 350   CORE_ADDR m_last_source_start_addr;
 351
 352   /* Stack of subfile names.  */
 353   std::vector<const char *> m_subfile_stack;
 354
 355   /* The "using" directives local to lexical context.  */
 356   struct using_direct *m_local_using_directives = nullptr;
 357
 358   /* Global "using" directives.  */
 359   struct using_direct *m_global_using_directives = nullptr;
 360
 361   /* The stack of contexts that are pushed by push_context and popped
 362      by pop_context.  */
 363   std::vector<struct context_stack> m_context_stack;
 364
 365   struct subfile *m_current_subfile = nullptr;
 366
 367   /* The mutable address map for the compilation unit whose symbols
 368      we're currently reading.  The symtabs' shared blockvector will
 369      point to a fixed copy of this.  */
 370   struct addrmap *m_pending_addrmap = nullptr;
 371
 372   /* The obstack on which we allocate pending_addrmap.
 373      If pending_addrmap is NULL, this is uninitialized; otherwise, it is
 374      initialized (and holds pending_addrmap).  */
 375   auto_obstack m_pending_addrmap_obstack;
 376
 377   /* True if we recorded any ranges in the addrmap that are different
 378      from those in the blockvector already.  We set this to false when
 379      we start processing a symfile, and if it's still false at the
 380      end, then we just toss the addrmap.  */
 381   bool m_pending_addrmap_interesting = false;
 382
 383   /* An obstack used for allocating pending blocks.  */
 384   auto_obstack m_pending_block_obstack;
 385
 386   /* Pointer to the head of a linked list of symbol blocks which have
 387      already been finalized (lexical contexts already closed) and which
 388      are just waiting to be built into a blockvector when finalizing the
 389      associated symtab.  */
 390   struct pending_block *m_pending_blocks = nullptr;
 391
 392   /* Pending static symbols and types at the top level.  */
 393   struct pending *m_file_symbols = nullptr;
 394
 395   /* Pending global functions and variables.  */
 396   struct pending *m_global_symbols = nullptr;
 397
 398   /* Pending symbols that are local to the lexical context.  */
 399   struct pending *m_local_symbols = nullptr;
 400 };
 401
 402 \f
 403
 404 extern void add_symbol_to_list (struct symbol *symbol,
 405                                 struct pending **listhead);
 406
 407 extern struct symbol *find_symbol_in_list (struct pending *list,
 408                                            char *name, int length);
 409
 410 #endif /* defined (BUILDSYM_H) */