gcc/debug.h

   1 /* Debug hooks for GCC.
   2    Copyright (C) 2001-2019 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify it
   5    under the terms of the GNU General Public License as published by the
   6    Free Software Foundation; either version 3, or (at your option) any
   7    later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; see the file COPYING3.  If not see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #ifndef GCC_DEBUG_H
  19 #define GCC_DEBUG_H
  20
  21 /* This structure contains hooks for the debug information output
  22    functions, accessed through the global instance debug_hooks set in
  23    toplev.c according to command line options.  */
  24 struct gcc_debug_hooks
  25 {
  26   /* Initialize debug output.  MAIN_FILENAME is the name of the main
  27      input file.  */
  28   void (* init) (const char *main_filename);
  29
  30   /* Output debug symbols.  */
  31   void (* finish) (const char *main_filename);
  32
  33   /* Run cleanups necessary after early debug generation.  */
  34   void (* early_finish) (const char *main_filename);
  35
  36   /* Called from cgraph_optimize before starting to assemble
  37      functions/variables/toplevel asms.  */
  38   void (* assembly_start) (void);
  39
  40   /* Macro defined on line LINE with name and expansion TEXT.  */
  41   void (* define) (unsigned int line, const char *text);
  42
  43   /* MACRO undefined on line LINE.  */
  44   void (* undef) (unsigned int line, const char *macro);
  45
  46   /* Record the beginning of a new source file FILE from LINE number
  47      in the previous one.  */
  48   void (* start_source_file) (unsigned int line, const char *file);
  49
  50   /* Record the resumption of a source file.  LINE is the line number
  51      in the source file we are returning to.  */
  52   void (* end_source_file) (unsigned int line);
  53
  54   /* Record the beginning of block N, counting from 1 and not
  55      including the function-scope block, at LINE.  */
  56   void (* begin_block) (unsigned int line, unsigned int n);
  57
  58   /* Record the end of a block.  Arguments as for begin_block.  */
  59   void (* end_block) (unsigned int line, unsigned int n);
  60
  61   /* Returns nonzero if it is appropriate not to emit any debugging
  62      information for BLOCK, because it doesn't contain any
  63      instructions.  This may not be the case for blocks containing
  64      nested functions, since we may actually call such a function even
  65      though the BLOCK information is messed up.  Defaults to true.  */
  66   bool (* ignore_block) (const_tree);
  67
  68   /* Record a source file location at (FILE, LINE, COLUMN, DISCRIMINATOR).  */
  69   void (* source_line) (unsigned int line, unsigned int column,
  70                         const char *file, int discriminator, bool is_stmt);
  71
  72   /* Called at start of prologue code.  LINE is the first line in the
  73      function.  */
  74   void (* begin_prologue) (unsigned int line, unsigned int column,
  75                            const char *file);
  76
  77   /* Called at end of prologue code.  LINE is the first line in the
  78      function.  */
  79   void (* end_prologue) (unsigned int line, const char *file);
  80
  81   /* Called at beginning of epilogue code.  */
  82   void (* begin_epilogue) (unsigned int line, const char *file);
  83
  84   /* Record end of epilogue code.  */
  85   void (* end_epilogue) (unsigned int line, const char *file);
  86
  87   /* Called at start of function DECL, before it is declared.  */
  88   void (* begin_function) (tree decl);
  89
  90   /* Record end of function.  LINE is highest line number in function.  */
  91   void (* end_function) (unsigned int line);
  92
  93   /* Register UNIT as the main translation unit.  Called from front-ends when
  94      they create their main translation unit.  */
  95   void (* register_main_translation_unit) (tree);
  96
  97   /* Debug information for a function DECL.  This might include the
  98      function name (a symbol), its parameters, and the block that
  99      makes up the function's body, and the local variables of the
 100      function.
 101
 102      This is only called for FUNCTION_DECLs.  It is part of the late
 103      debug pass and is called from rest_of_handle_final.
 104
 105      Location information is available at this point.
 106
 107      See the documentation for early_global_decl and late_global_decl
 108      for other entry points into the debugging back-ends for DECLs.  */
 109   void (* function_decl) (tree decl);
 110
 111   /* Debug information for a global DECL.  Called from the parser
 112      after the parsing process has finished.
 113
 114      This gets called for both variables and functions.
 115
 116      Location information is not available at this point, but it is a
 117      good probe point to get access to symbols before they get
 118      optimized away.
 119
 120      This hook may be called on VAR_DECLs or FUNCTION_DECLs.  It is up
 121      to the hook to use what it needs.  */
 122   void (* early_global_decl) (tree decl);
 123
 124   /* Augment debug information generated by early_global_decl with
 125      more complete debug info (if applicable).  Called from toplev.c
 126      after the compilation proper has finished and cgraph information
 127      is available.
 128
 129      This gets called for both variables and functions.
 130
 131      Location information is usually available at this point, unless
 132      the hook is being called for a decl that has been optimized away.
 133
 134      This hook may be called on VAR_DECLs or FUNCTION_DECLs.  It is up
 135      to the hook to use what it needs.  */
 136   void (* late_global_decl) (tree decl);
 137
 138   /* Debug information for a type DECL.  Called from toplev.c after
 139      compilation proper, also from various language front ends to
 140      record built-in types.  The second argument is properly a
 141      boolean, which indicates whether or not the type is a "local"
 142      type as determined by the language.  (It's not a boolean for
 143      legacy reasons.)  */
 144   void (* type_decl) (tree decl, int local);
 145
 146   /* Debug information for imported modules and declarations.  */
 147   void (* imported_module_or_decl) (tree decl, tree name,
 148                                     tree context, bool child,
 149                                     bool implicit);
 150
 151   /* Return true if a DIE for the tree is available and return a symbol
 152      and offset that can be used to refer to it externally.  */
 153   bool (* die_ref_for_decl) (tree, const char **, unsigned HOST_WIDE_INT *);
 154
 155   /* Early debug information for the tree is available at symbol plus
 156      offset externally.  */
 157   void (* register_external_die) (tree, const char *, unsigned HOST_WIDE_INT);
 158
 159   /* DECL is an inline function, whose body is present, but which is
 160      not being output at this point.  */
 161   void (* deferred_inline_function) (tree decl);
 162
 163   /* DECL is an inline function which is about to be emitted out of
 164      line.  The hook is useful to, e.g., emit abstract debug info for
 165      the inline before it gets mangled by optimization.  */
 166   void (* outlining_inline_function) (tree decl);
 167
 168   /* Called from final_scan_insn for any CODE_LABEL insn whose
 169      LABEL_NAME is non-null.  */
 170   void (* label) (rtx_code_label *);
 171
 172   /* Called after the start and before the end of writing a PCH file.
 173      The parameter is 0 if after the start, 1 if before the end.  */
 174   void (* handle_pch) (unsigned int);
 175
 176   /* Called from final_scan_insn for any NOTE_INSN_VAR_LOCATION note.  */
 177   void (* var_location) (rtx_insn *);
 178
 179   /* Called from final_scan_insn for any NOTE_INSN_INLINE_ENTRY note.  */
 180   void (* inline_entry) (tree block);
 181
 182   /* Called from finalize_size_functions for size functions so that their body
 183      can be encoded in the debug info to describe the layout of variable-length
 184      structures.  */
 185   void (* size_function) (tree decl);
 186
 187   /* Called from final_scan_insn if there is a switch between hot and cold
 188      text sections.  */
 189   void (* switch_text_section) (void);
 190
 191   /* Called from grokdeclarator.  Replaces the anonymous name with the
 192      type name.  */
 193   void (* set_name) (tree, tree);
 194
 195   /* This is 1 if the debug writer wants to see start and end commands for the
 196      main source files, and 0 otherwise.  */
 197   int start_end_main_source_file;
 198
 199   /* The type of symtab field used by these debug hooks.  This is one
 200      of the TYPE_SYMTAB_IS_xxx values defined in tree.h.  */
 201   int tree_type_symtab_field;
 202 };
 203
 204 extern const struct gcc_debug_hooks *debug_hooks;
 205
 206 /* The do-nothing hooks.  */
 207 extern void debug_nothing_void (void);
 208 extern void debug_nothing_charstar (const char *);
 209 extern void debug_nothing_int_int_charstar (unsigned int, unsigned int,
 210                                             const char *);
 211 extern void debug_nothing_int_charstar (unsigned int, const char *);
 212 extern void debug_nothing_int_int_charstar_int_bool (unsigned int,
 213                                                      unsigned int,
 214                                                      const char *,
 215                                                      int, bool);
 216 extern void debug_nothing_int (unsigned int);
 217 extern void debug_nothing_int_int (unsigned int, unsigned int);
 218 extern void debug_nothing_tree (tree);
 219 extern void debug_nothing_tree_tree (tree, tree);
 220 extern void debug_nothing_tree_int (tree, int);
 221 extern void debug_nothing_tree_tree_tree_bool_bool (tree, tree, tree,
 222                                                     bool, bool);
 223 extern bool debug_true_const_tree (const_tree);
 224 extern void debug_nothing_rtx_insn (rtx_insn *);
 225 extern void debug_nothing_rtx_code_label (rtx_code_label *);
 226 extern bool debug_false_tree_charstarstar_uhwistar (tree, const char **,
 227                                                     unsigned HOST_WIDE_INT *);
 228 extern void debug_nothing_tree_charstar_uhwi (tree, const char *,
 229                                               unsigned HOST_WIDE_INT);
 230
 231 /* Hooks for various debug formats.  */
 232 extern const struct gcc_debug_hooks do_nothing_debug_hooks;
 233 extern const struct gcc_debug_hooks dbx_debug_hooks;
 234 extern const struct gcc_debug_hooks xcoff_debug_hooks;
 235 extern const struct gcc_debug_hooks dwarf2_debug_hooks;
 236 extern const struct gcc_debug_hooks dwarf2_lineno_debug_hooks;
 237 extern const struct gcc_debug_hooks vmsdbg_debug_hooks;
 238
 239 /* Dwarf2 frame information.  */
 240
 241 extern void dwarf2out_begin_prologue (unsigned int, unsigned int,
 242                                       const char *);
 243 extern void dwarf2out_vms_end_prologue (unsigned int, const char *);
 244 extern void dwarf2out_vms_begin_epilogue (unsigned int, const char *);
 245 extern void dwarf2out_end_epilogue (unsigned int, const char *);
 246 extern void dwarf2out_frame_finish (void);
 247 extern bool dwarf2out_do_eh_frame (void);
 248 extern bool dwarf2out_do_frame (void);
 249 extern bool dwarf2out_do_cfi_asm (void);
 250 extern void dwarf2out_switch_text_section (void);
 251 extern bool dwarf2out_default_as_loc_support (void);
 252 extern bool dwarf2out_default_as_locview_support (void);
 253
 254 /* For -fdump-go-spec.  */
 255
 256 extern const struct gcc_debug_hooks *
 257 dump_go_spec_init (const char *, const struct gcc_debug_hooks *);
 258
 259 /* Instance discriminator mapping table.  See final.c.  */
 260 typedef hash_map<const_tree, int> decl_to_instance_map_t;
 261 extern decl_to_instance_map_t *decl_to_instance_map;
 262
 263 /* Allocate decl_to_instance_map with COUNT slots to begin wtih, if it
 264  * hasn't been allocated yet.  */
 265
 266 static inline decl_to_instance_map_t *
 267 maybe_create_decl_to_instance_map (int count = 13)
 268 {
 269   if (!decl_to_instance_map)
 270     decl_to_instance_map = new decl_to_instance_map_t (count);
 271   return decl_to_instance_map;
 272 }
 273
 274 #endif /* !GCC_DEBUG_H  */