gcc/objc/objc-runtime-hooks.h

   1 /* Hooks to abstract the runtime meta-data generation for Objective C.
   2    Copyright (C) 2011 Free Software Foundation, Inc.
   3    Contributed by Iain Sandoe
   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 #ifndef _OBJC_RUNTIME_HOOKS_H_
  22 #define _OBJC_RUNTIME_HOOKS_H_
  23
  24 /* A set of hooks for the front end to obtain runtime-specific actions.  */
  25
  26 /* Objective-C supports several runtime library variants:
  27
  28    "GNU" runtime selected by -fgnu-runtime (currently at API version 1).
  29    "NeXT" runtime (selected by -fnext-runtime) and installed on OSX/Darwin
  30    systems at API version 1 (for m32 code) and version 2 (for m64 code).
  31
  32    The runtimes require different data types/layouts, method call mechanisms
  33    and so on, and the purpose of this interface is to abstract such
  34    differences from the parser's perspective.  */
  35
  36 typedef struct _objc_runtime_hooks_r
  37 {
  38   /* Initialize for this runtime.  */
  39   void (*initialize) (void);
  40   const char *default_constant_string_class_name;
  41
  42   /* FIXME: Having to check this name should not be necessary.  */
  43   const char *tag_getclass;
  44   /* id for superclass class field - named differently in the existing
  45      runtimes.  */
  46   tree (*super_superclassfield_ident) (void);
  47
  48   /* Obtain a class decl for the identifier.  */
  49   tree (*class_decl) (tree);
  50   /* Obtain a metaclass decl for the identifier.  */
  51   tree (*metaclass_decl) (tree);
  52   /* Obtain a category decl for the identifier.  */
  53   tree (*category_decl) (tree);
  54   /* Obtain a protocol decl for the identifier.  */
  55   tree (*protocol_decl) (tree);
  56   /* Obtain a string decl, to be placed in the nominated string-section.  */
  57   tree (*string_decl) (tree, const char *, string_section);
  58
  59   /* Obtain a class reference, generating the fwd def. if necessary.  */
  60   tree (*get_class_reference) (tree);
  61   /* build/get selector reference.  */
  62   tree (*build_selector_reference) (location_t, tree, tree);
  63   /* Get a protocol reference, generating the forward def. if necessary.  */
  64   tree (*get_protocol_reference) (location_t, tree);
  65   /* Get an ivar ref. re the base.  */
  66   tree (*build_ivar_reference) (location_t, tree, tree);
  67   /* Get a reference to {meta}class' super.  */
  68   tree (*get_class_super_ref) (location_t, struct imp_entry *, bool);
  69   /* Get a reference to Category {meta}class' super.  */
  70   tree (*get_category_super_ref) (location_t, struct imp_entry *, bool);
  71
  72   /* Receiver is class Object, check runtime-specific.  */
  73   tree (*receiver_is_class_object) (tree);
  74   /* Get the start of a method argument type list (receiver, _cmd).  */
  75   tree (*get_arg_type_list_base) (tree, int, int);
  76   /* Build method call.  */
  77   tree (*build_objc_method_call) (location_t, tree, tree, tree, tree, tree, int);
  78
  79   /* Check for or otherwise handle a request to check that the constant
  80      string class reference is set-up & OK.  */
  81   bool (*setup_const_string_class_decl) (void);
  82   /* Return the tree reprenting a const string constructor for the arg.
  83      Most of the data are in global trees.  */
  84   tree (*build_const_string_constructor) (location_t, tree, int);
  85
  86   /* Exceptions.  */
  87   tree (*build_throw_stmt) (location_t, tree, bool);
  88   tree (*build_exc_ptr) (struct objc_try_context **);
  89   tree (*begin_catch) (struct objc_try_context **, tree, tree, tree, bool);
  90   void (*finish_catch) (struct objc_try_context **, tree);
  91   tree (*finish_try_stmt) (struct objc_try_context **);
  92
  93   /* Emit all the metadata required by the runtime - based on the tables built
  94      during parsing.  */
  95   void (*generate_metadata) (void);
  96
  97 } objc_runtime_hooks;
  98
  99 /* For shared support that needs to access these.  */
 100 extern objc_runtime_hooks runtime;
 101
 102 /* One per runtime at present.
 103    TODO: Make into some kind of configury-generated table.  */
 104 extern bool objc_gnu_runtime_abi_01_init (objc_runtime_hooks *);
 105 extern bool objc_next_runtime_abi_01_init (objc_runtime_hooks *);
 106 extern bool objc_next_runtime_abi_02_init (objc_runtime_hooks *);
 107
 108 #endif /* _OBJC_RUNTIME_HOOKS_H_ */