gcc/plugin.h

   1 /* Header file for internal GCC plugin mechanism.
   2    Copyright (C) 2009-2021 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC 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, or (at your option)
   9 any later version.
  10
  11 GCC 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 GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef PLUGIN_H
  21 #define PLUGIN_H
  22
  23 #include "highlev-plugin-common.h"
  24
  25 /* Event names.  */
  26 enum plugin_event
  27 {
  28 # define DEFEVENT(NAME) NAME,
  29 # include "plugin.def"
  30 # undef DEFEVENT
  31   PLUGIN_EVENT_FIRST_DYNAMIC
  32 };
  33
  34 /* All globals declared here have C linkage to reduce link compatibility
  35    issues with implementation language choice and mangling.  */
  36 #ifdef __cplusplus
  37 extern "C" {
  38 #endif
  39
  40 extern const char **plugin_event_name;
  41
  42 struct plugin_argument
  43 {
  44   char *key;    /* key of the argument.  */
  45   char *value;  /* value is optional and can be NULL.  */
  46 };
  47
  48 /* Additional information about the plugin. Used by --help and --version. */
  49
  50 struct plugin_info
  51 {
  52   const char *version;
  53   const char *help;
  54 };
  55
  56 /* Represents the gcc version. Used to avoid using an incompatible plugin. */
  57
  58 struct plugin_gcc_version
  59 {
  60   const char *basever;
  61   const char *datestamp;
  62   const char *devphase;
  63   const char *revision;
  64   const char *configuration_arguments;
  65 };
  66
  67 /* Object that keeps track of the plugin name and its arguments. */
  68 struct plugin_name_args
  69 {
  70   char *base_name;              /* Short name of the plugin (filename without
  71                                    .so suffix). */
  72   const char *full_name;        /* Path to the plugin as specified with
  73                                    -fplugin=. */
  74   int argc;                     /* Number of arguments specified with
  75                                    -fplugin-arg-... */
  76   struct plugin_argument *argv; /* Array of ARGC key-value pairs. */
  77   const char *version;          /* Version string provided by plugin. */
  78   const char *help;             /* Help string provided by plugin. */
  79 };
  80
  81 /* The default version check. Compares every field in VERSION. */
  82
  83 extern bool plugin_default_version_check (struct plugin_gcc_version *,
  84                                           struct plugin_gcc_version *);
  85
  86 /* Function type for the plugin initialization routine. Each plugin module
  87    should define this as an externally-visible function with name
  88    "plugin_init."
  89
  90    PLUGIN_INFO - plugin invocation information.
  91    VERSION     - the plugin_gcc_version symbol of GCC.
  92
  93    Returns 0 if initialization finishes successfully.  */
  94
  95 typedef int (*plugin_init_func) (struct plugin_name_args *plugin_info,
  96                                  struct plugin_gcc_version *version);
  97
  98 /* Declaration for "plugin_init" function so that it doesn't need to be
  99    duplicated in every plugin.  */
 100 extern int plugin_init (struct plugin_name_args *plugin_info,
 101                         struct plugin_gcc_version *version);
 102
 103 /* Function type for a plugin callback routine.
 104
 105    GCC_DATA  - event-specific data provided by GCC
 106    USER_DATA - plugin-specific data provided by the plugin  */
 107
 108 typedef void (*plugin_callback_func) (void *gcc_data, void *user_data);
 109
 110 /* Called from the plugin's initialization code. Register a single callback.
 111    This function can be called multiple times.
 112
 113    PLUGIN_NAME - display name for this plugin
 114    EVENT       - which event the callback is for
 115    CALLBACK    - the callback to be called at the event
 116    USER_DATA   - plugin-provided data.
 117 */
 118
 119 /* Number of event ids / names registered so far.  */
 120
 121 extern int get_event_last (void);
 122
 123 int get_named_event_id (const char *name, enum insert_option insert);
 124
 125 /* This is also called without a callback routine for the
 126    PLUGIN_PASS_MANAGER_SETUP, PLUGIN_INFO and PLUGIN_REGISTER_GGC_ROOTS
 127    pseudo-events, with a specific user_data.
 128   */
 129
 130 extern void register_callback (const char *plugin_name,
 131                                int event,
 132                                plugin_callback_func callback,
 133                                void *user_data);
 134
 135 extern int unregister_callback (const char *plugin_name, int event);
 136
 137
 138 /* Retrieve the plugin directory name, as returned by the
 139    -fprint-file-name=plugin argument to the gcc program, which is the
 140    -iplugindir program argument to cc1.  */
 141 extern const char* default_plugin_dir_name (void);
 142
 143 #ifdef __cplusplus
 144 }
 145 #endif
 146
 147 /* In case the C++ compiler does name mangling for globals, declare
 148    plugin_is_GPL_compatible extern "C" so that a later definition
 149    in a plugin file will have this linkage.  */
 150 #ifdef __cplusplus
 151 extern "C" {
 152 #endif
 153 extern int plugin_is_GPL_compatible;
 154 #ifdef __cplusplus
 155 }
 156 #endif
 157
 158
 159 struct attribute_spec;
 160 struct scoped_attributes;
 161
 162 extern void add_new_plugin (const char *);
 163 extern void parse_plugin_arg_opt (const char *);
 164 extern int invoke_plugin_callbacks_full (int, void *);
 165 extern void initialize_plugins (void);
 166 extern bool plugins_active_p (void);
 167 extern void dump_active_plugins (FILE *);
 168 extern void debug_active_plugins (void);
 169 extern void warn_if_plugins (void);
 170 extern void print_plugins_versions (FILE *file, const char *indent);
 171 extern void print_plugins_help (FILE *file, const char *indent);
 172 extern void finalize_plugins (void);
 173
 174 extern bool flag_plugin_added;
 175
 176 /* Called from inside GCC.  Invoke all plugin callbacks registered with
 177    the specified event.
 178    Return PLUGEVT_SUCCESS if at least one callback was called,
 179    PLUGEVT_NO_CALLBACK if there was no callback.
 180
 181    EVENT    - the event identifier
 182    GCC_DATA - event-specific data provided by the compiler  */
 183
 184 static inline int
 185 invoke_plugin_callbacks (int event ATTRIBUTE_UNUSED,
 186                          void *gcc_data ATTRIBUTE_UNUSED)
 187 {
 188 #ifdef ENABLE_PLUGIN
 189   /* True iff at least one plugin has been added.  */
 190   if (flag_plugin_added)
 191     return invoke_plugin_callbacks_full (event, gcc_data);
 192 #endif
 193
 194   return PLUGEVT_NO_CALLBACK;
 195 }
 196
 197 /* In attribs.c.  */
 198
 199 extern void register_attribute (const struct attribute_spec *attr);
 200 extern struct scoped_attributes* register_scoped_attributes (const struct attribute_spec *,
 201                                                              const char *);
 202
 203 #endif /* PLUGIN_H */