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gnu / gcc / cd99b30c7cf1e68ef76ed2af7a41ac74c78116fe / . / gcc / objc / objc-act.c
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/* Implement classes and message passing for Objective C.
Copyright (C) 1992, 1993, 1994, 1995, 1997, 1998, 1999, 2000,
2001, 2002, 2003, 2004, 2005, 2007, 2008 Free Software Foundation, Inc.
Contributed by Steve Naroff.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GCC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
/* Purpose: This module implements the Objective-C 4.0 language.
compatibility issues (with the Stepstone translator):
- does not recognize the following 3.3 constructs.
@requires, @classes, @messages, = (...)
- methods with variable arguments must conform to ANSI standard.
- tagged structure definitions that appear in BOTH the interface
and implementation are not allowed.
- public/private: all instance variables are public within the
context of the implementation...I consider this to be a bug in
the translator.
- statically allocated objects are not supported. the user will
receive an error if this service is requested.
code generation `options':
*/
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "tree.h"
#include "rtl.h"
#include "tm_p.h"
#include "expr.h"
#ifdef OBJCPLUS
#include "cp-tree.h"
#else
#include "c-tree.h"
#endif
#include "c-common.h"
#include "c-pragma.h"
#include "flags.h"
#include "langhooks.h"
#include "objc-act.h"
#include "input.h"
#include "except.h"
#include "function.h"
#include "output.h"
#include "toplev.h"
#include "ggc.h"
#include "varray.h"
#include "debug.h"
#include "target.h"
#include "diagnostic.h"
#include "cgraph.h"
#include "tree-iterator.h"
#include "libfuncs.h"
#include "hashtab.h"
#include "langhooks-def.h"
#define OBJC_VOID_AT_END void_list_node
static unsigned int should_call_super_dealloc = 0;
/* When building Objective-C++, we are not linking against the C front-end
and so need to replicate the C tree-construction functions in some way. */
#ifdef OBJCPLUS
#define OBJCP_REMAP_FUNCTIONS
#include "objcp-decl.h"
#endif /* OBJCPLUS */
/* This is the default way of generating a method name. */
/* I am not sure it is really correct.
Perhaps there's a danger that it will make name conflicts
if method names contain underscores. -- rms. */
#ifndef OBJC_GEN_METHOD_LABEL
#define OBJC_GEN_METHOD_LABEL(BUF, IS_INST, CLASS_NAME, CAT_NAME, SEL_NAME, NUM) \
do { \
char *temp; \
sprintf ((BUF), "_%s_%s_%s_%s", \
((IS_INST) ? "i" : "c"), \
(CLASS_NAME), \
((CAT_NAME)? (CAT_NAME) : ""), \
(SEL_NAME)); \
for (temp = (BUF); *temp; temp++) \
if (*temp == ':') *temp = '_'; \
} while (0)
#endif
/* These need specifying. */
#ifndef OBJC_FORWARDING_STACK_OFFSET
#define OBJC_FORWARDING_STACK_OFFSET 0
#endif
#ifndef OBJC_FORWARDING_MIN_OFFSET
#define OBJC_FORWARDING_MIN_OFFSET 0
#endif
/* Set up for use of obstacks. */
#include "obstack.h"
/* This obstack is used to accumulate the encoding of a data type. */
static struct obstack util_obstack;
/* This points to the beginning of obstack contents, so we can free
the whole contents. */
char *util_firstobj;
/* The version identifies which language generation and runtime
the module (file) was compiled for, and is recorded in the
module descriptor. */
#define OBJC_VERSION (flag_next_runtime ? 6 : 8)
#define PROTOCOL_VERSION 2
/* (Decide if these can ever be validly changed.) */
#define OBJC_ENCODE_INLINE_DEFS 0
#define OBJC_ENCODE_DONT_INLINE_DEFS 1
/*** Private Interface (procedures) ***/
/* Used by compile_file. */
static void init_objc (void);
static void finish_objc (void);
/* Code generation. */
static tree objc_build_constructor (tree, tree);
static tree build_objc_method_call (int, tree, tree, tree, tree);
static tree get_proto_encoding (tree);
static tree lookup_interface (tree);
static tree objc_add_static_instance (tree, tree);
static tree start_class (enum tree_code, tree, tree, tree);
static tree continue_class (tree);
static void finish_class (tree);
static void start_method_def (tree);
#ifdef OBJCPLUS
static void objc_start_function (tree, tree, tree, tree);
#else
static void objc_start_function (tree, tree, tree, struct c_arg_info *);
#endif
static tree start_protocol (enum tree_code, tree, tree);
static tree build_method_decl (enum tree_code, tree, tree, tree, bool);
static tree objc_add_method (tree, tree, int);
static tree add_instance_variable (tree, int, tree);
static tree build_ivar_reference (tree);
static tree is_ivar (tree, tree);
static void build_objc_exception_stuff (void);
static void build_next_objc_exception_stuff (void);
/* We only need the following for ObjC; ObjC++ will use C++'s definition
of DERIVED_FROM_P. */
#ifndef OBJCPLUS
static bool objc_derived_from_p (tree, tree);
#define DERIVED_FROM_P(PARENT, CHILD) objc_derived_from_p (PARENT, CHILD)
#endif
static void objc_xref_basetypes (tree, tree);
static void build_class_template (void);
static void build_selector_template (void);
static void build_category_template (void);
static void build_super_template (void);
static tree build_protocol_initializer (tree, tree, tree, tree, tree);
static tree get_class_ivars (tree, bool);
static tree generate_protocol_list (tree);
static void build_protocol_reference (tree);
#ifdef OBJCPLUS
static void objc_generate_cxx_cdtors (void);
#endif
static const char *synth_id_with_class_suffix (const char *, tree);
/* Hash tables to manage the global pool of method prototypes. */
hash *nst_method_hash_list = 0;
hash *cls_method_hash_list = 0;
static hash hash_lookup (hash *, tree);
static tree lookup_method (tree, tree);
static tree lookup_method_static (tree, tree, int);
enum string_section
{
class_names, /* class, category, protocol, module names */
meth_var_names, /* method and variable names */
meth_var_types /* method and variable type descriptors */
};
static tree add_objc_string (tree, enum string_section);
static tree build_objc_string_decl (enum string_section);
static void build_selector_table_decl (void);
/* Protocol additions. */
static tree lookup_protocol (tree);
static tree lookup_and_install_protocols (tree);
/* Type encoding. */
static void encode_type_qualifiers (tree);
static void encode_type (tree, int, int);
static void encode_field_decl (tree, int, int);
#ifdef OBJCPLUS
static void really_start_method (tree, tree);
#else
static void really_start_method (tree, struct c_arg_info *);
#endif
static int comp_proto_with_proto (tree, tree, int);
static void objc_push_parm (tree);
#ifdef OBJCPLUS
static tree objc_get_parm_info (int);
#else
static struct c_arg_info *objc_get_parm_info (int);
#endif
/* Utilities for debugging and error diagnostics. */
static void warn_with_method (const char *, int, tree);
static char *gen_type_name (tree);
static char *gen_type_name_0 (tree);
static char *gen_method_decl (tree);
static char *gen_declaration (tree);
/* Everything else. */
static tree create_field_decl (tree, const char *);
static void add_class_reference (tree);
static void build_protocol_template (void);
static tree encode_method_prototype (tree);
static void generate_classref_translation_entry (tree);
static void handle_class_ref (tree);
static void generate_struct_by_value_array (void)
ATTRIBUTE_NORETURN;
static void mark_referenced_methods (void);
static void generate_objc_image_info (void);
/*** Private Interface (data) ***/
/* Reserved tag definitions. */
#define OBJECT_TYPEDEF_NAME "id"
#define CLASS_TYPEDEF_NAME "Class"
#define TAG_OBJECT "objc_object"
#define TAG_CLASS "objc_class"
#define TAG_SUPER "objc_super"
#define TAG_SELECTOR "objc_selector"
#define UTAG_CLASS "_objc_class"
#define UTAG_IVAR "_objc_ivar"
#define UTAG_IVAR_LIST "_objc_ivar_list"
#define UTAG_METHOD "_objc_method"
#define UTAG_METHOD_LIST "_objc_method_list"
#define UTAG_CATEGORY "_objc_category"
#define UTAG_MODULE "_objc_module"
#define UTAG_SYMTAB "_objc_symtab"
#define UTAG_SUPER "_objc_super"
#define UTAG_SELECTOR "_objc_selector"
#define UTAG_PROTOCOL "_objc_protocol"
#define UTAG_METHOD_PROTOTYPE "_objc_method_prototype"
#define UTAG_METHOD_PROTOTYPE_LIST "_objc__method_prototype_list"
/* Note that the string object global name is only needed for the
NeXT runtime. */
#define STRING_OBJECT_GLOBAL_FORMAT "_%sClassReference"
#define PROTOCOL_OBJECT_CLASS_NAME "Protocol"
static const char *TAG_GETCLASS;
static const char *TAG_GETMETACLASS;
static const char *TAG_MSGSEND;
static const char *TAG_MSGSENDSUPER;
/* The NeXT Objective-C messenger may have two extra entry points, for use
when returning a structure. */
static const char *TAG_MSGSEND_STRET;
static const char *TAG_MSGSENDSUPER_STRET;
static const char *default_constant_string_class_name;
/* Runtime metadata flags. */
#define CLS_FACTORY 0x0001L
#define CLS_META 0x0002L
#define CLS_HAS_CXX_STRUCTORS 0x2000L
#define OBJC_MODIFIER_STATIC 0x00000001
#define OBJC_MODIFIER_FINAL 0x00000002
#define OBJC_MODIFIER_PUBLIC 0x00000004
#define OBJC_MODIFIER_PRIVATE 0x00000008
#define OBJC_MODIFIER_PROTECTED 0x00000010
#define OBJC_MODIFIER_NATIVE 0x00000020
#define OBJC_MODIFIER_SYNCHRONIZED 0x00000040
#define OBJC_MODIFIER_ABSTRACT 0x00000080
#define OBJC_MODIFIER_VOLATILE 0x00000100
#define OBJC_MODIFIER_TRANSIENT 0x00000200
#define OBJC_MODIFIER_NONE_SPECIFIED 0x80000000
/* NeXT-specific tags. */
#define TAG_MSGSEND_NONNIL "objc_msgSendNonNil"
#define TAG_MSGSEND_NONNIL_STRET "objc_msgSendNonNil_stret"
#define TAG_EXCEPTIONEXTRACT "objc_exception_extract"
#define TAG_EXCEPTIONTRYENTER "objc_exception_try_enter"
#define TAG_EXCEPTIONTRYEXIT "objc_exception_try_exit"
#define TAG_EXCEPTIONMATCH "objc_exception_match"
#define TAG_EXCEPTIONTHROW "objc_exception_throw"
#define TAG_SYNCENTER "objc_sync_enter"
#define TAG_SYNCEXIT "objc_sync_exit"
#define TAG_SETJMP "_setjmp"
#define UTAG_EXCDATA "_objc_exception_data"
#define TAG_ASSIGNIVAR "objc_assign_ivar"
#define TAG_ASSIGNGLOBAL "objc_assign_global"
#define TAG_ASSIGNSTRONGCAST "objc_assign_strongCast"
/* Branch entry points. All that matters here are the addresses;
functions with these names do not really exist in libobjc. */
#define TAG_MSGSEND_FAST "objc_msgSend_Fast"
#define TAG_ASSIGNIVAR_FAST "objc_assign_ivar_Fast"
#define TAG_CXX_CONSTRUCT ".cxx_construct"
#define TAG_CXX_DESTRUCT ".cxx_destruct"
/* GNU-specific tags. */
#define TAG_EXECCLASS "__objc_exec_class"
#define TAG_GNUINIT "__objc_gnu_init"
/* Flags for lookup_method_static(). */
#define OBJC_LOOKUP_CLASS 1 /* Look for class methods. */
#define OBJC_LOOKUP_NO_SUPER 2 /* Do not examine superclasses. */
/* The OCTI_... enumeration itself is in objc/objc-act.h. */
tree objc_global_trees[OCTI_MAX];
static void handle_impent (struct imp_entry *);
struct imp_entry *imp_list = 0;
int imp_count = 0; /* `@implementation' */
int cat_count = 0; /* `@category' */
enum tree_code objc_inherit_code;
int objc_public_flag;
/* Use to generate method labels. */
static int method_slot = 0;
#define BUFSIZE 1024
static char *errbuf; /* Buffer for error diagnostics */
/* Data imported from tree.c. */
extern enum debug_info_type write_symbols;
/* Data imported from toplev.c. */
extern const char *dump_base_name;
static int flag_typed_selectors;
/* Store all constructed constant strings in a hash table so that
they get uniqued properly. */
struct string_descriptor GTY(())
{
/* The literal argument . */
tree literal;
/* The resulting constant string. */
tree constructor;
};
static GTY((param_is (struct string_descriptor))) htab_t string_htab;
/* Store the EH-volatilized types in a hash table, for easy retrieval. */
struct volatilized_type GTY(())
{
tree type;
};
static GTY((param_is (struct volatilized_type))) htab_t volatilized_htab;
FILE *gen_declaration_file;
/* Tells "encode_pointer/encode_aggregate" whether we are generating
type descriptors for instance variables (as opposed to methods).
Type descriptors for instance variables contain more information
than methods (for static typing and embedded structures). */
static int generating_instance_variables = 0;
/* Some platforms pass small structures through registers versus
through an invisible pointer. Determine at what size structure is
the transition point between the two possibilities. */
static void
generate_struct_by_value_array (void)
{
tree type;
tree field_decl, field_decl_chain;
int i, j;
int aggregate_in_mem[32];
int found = 0;
/* Presumably no platform passes 32 byte structures in a register. */
for (i = 1; i < 32; i++)
{
char buffer[5];
/* Create an unnamed struct that has `i' character components */
type = start_struct (RECORD_TYPE, NULL_TREE);
strcpy (buffer, "c1");
field_decl = create_field_decl (char_type_node,
buffer);
field_decl_chain = field_decl;
for (j = 1; j < i; j++)
{
sprintf (buffer, "c%d", j + 1);
field_decl = create_field_decl (char_type_node,
buffer);
chainon (field_decl_chain, field_decl);
}
finish_struct (type, field_decl_chain, NULL_TREE);
aggregate_in_mem[i] = aggregate_value_p (type, 0);
if (!aggregate_in_mem[i])
found = 1;
}
/* We found some structures that are returned in registers instead of memory
so output the necessary data. */
if (found)
{
for (i = 31; i >= 0; i--)
if (!aggregate_in_mem[i])
break;
printf ("#define OBJC_MAX_STRUCT_BY_VALUE %d\n\n", i);
/* The first member of the structure is always 0 because we don't handle
structures with 0 members */
printf ("static int struct_forward_array[] = {\n 0");
for (j = 1; j <= i; j++)
printf (", %d", aggregate_in_mem[j]);
printf ("\n};\n");
}
exit (0);
}
bool
objc_init (void)
{
#ifdef OBJCPLUS
if (cxx_init () == false)
#else
if (c_objc_common_init () == false)
#endif
return false;
/* If gen_declaration desired, open the output file. */
if (flag_gen_declaration)
{
register char * const dumpname = concat (dump_base_name, ".decl", NULL);
gen_declaration_file = fopen (dumpname, "w");
if (gen_declaration_file == 0)
fatal_error ("can't open %s: %m", dumpname);
free (dumpname);
}
if (flag_next_runtime)
{
TAG_GETCLASS = "objc_getClass";
TAG_GETMETACLASS = "objc_getMetaClass";
TAG_MSGSEND = "objc_msgSend";
TAG_MSGSENDSUPER = "objc_msgSendSuper";
TAG_MSGSEND_STRET = "objc_msgSend_stret";
TAG_MSGSENDSUPER_STRET = "objc_msgSendSuper_stret";
default_constant_string_class_name = "NSConstantString";
}
else
{
TAG_GETCLASS = "objc_get_class";
TAG_GETMETACLASS = "objc_get_meta_class";
TAG_MSGSEND = "objc_msg_lookup";
TAG_MSGSENDSUPER = "objc_msg_lookup_super";
/* GNU runtime does not provide special functions to support
structure-returning methods. */
default_constant_string_class_name = "NXConstantString";
flag_typed_selectors = 1;
}
init_objc ();
if (print_struct_values)
generate_struct_by_value_array ();
return true;
}
void
objc_finish_file (void)
{
mark_referenced_methods ();
#ifdef OBJCPLUS
/* We need to instantiate templates _before_ we emit ObjC metadata;
if we do not, some metadata (such as selectors) may go missing. */
at_eof = 1;
instantiate_pending_templates (0);
#endif
/* Finalize Objective-C runtime data. No need to generate tables
and code if only checking syntax, or if generating a PCH file. */
if (!flag_syntax_only && !pch_file)
finish_objc ();
if (gen_declaration_file)
fclose (gen_declaration_file);
}
/* Return the first occurrence of a method declaration corresponding
to sel_name in rproto_list. Search rproto_list recursively.
If is_class is 0, search for instance methods, otherwise for class
methods. */
static tree
lookup_method_in_protocol_list (tree rproto_list, tree sel_name,
int is_class)
{
tree rproto, p;
tree fnd = 0;
for (rproto = rproto_list; rproto; rproto = TREE_CHAIN (rproto))
{
p = TREE_VALUE (rproto);
if (TREE_CODE (p) == PROTOCOL_INTERFACE_TYPE)
{
if ((fnd = lookup_method (is_class
? PROTOCOL_CLS_METHODS (p)
: PROTOCOL_NST_METHODS (p), sel_name)))
;
else if (PROTOCOL_LIST (p))
fnd = lookup_method_in_protocol_list (PROTOCOL_LIST (p),
sel_name, is_class);
}
else
{
; /* An identifier...if we could not find a protocol. */
}
if (fnd)
return fnd;
}
return 0;
}
static tree
lookup_protocol_in_reflist (tree rproto_list, tree lproto)
{
tree rproto, p;
/* Make sure the protocol is supported by the object on the rhs. */
if (TREE_CODE (lproto) == PROTOCOL_INTERFACE_TYPE)
{
tree fnd = 0;
for (rproto = rproto_list; rproto; rproto = TREE_CHAIN (rproto))
{
p = TREE_VALUE (rproto);
if (TREE_CODE (p) == PROTOCOL_INTERFACE_TYPE)
{
if (lproto == p)
fnd = lproto;
else if (PROTOCOL_LIST (p))
fnd = lookup_protocol_in_reflist (PROTOCOL_LIST (p), lproto);
}
if (fnd)
return fnd;
}
}
else
{
; /* An identifier...if we could not find a protocol. */
}
return 0;
}
void
objc_start_class_interface (tree klass, tree super_class, tree protos)
{
objc_interface_context
= objc_ivar_context
= start_class (CLASS_INTERFACE_TYPE, klass, super_class, protos);
objc_public_flag = 0;
}
void
objc_start_category_interface (tree klass, tree categ, tree protos)
{
objc_interface_context
= start_class (CATEGORY_INTERFACE_TYPE, klass, categ, protos);
objc_ivar_chain
= continue_class (objc_interface_context);
}
void
objc_start_protocol (tree name, tree protos)
{
objc_interface_context
= start_protocol (PROTOCOL_INTERFACE_TYPE, name, protos);
}
void
objc_continue_interface (void)
{
objc_ivar_chain
= continue_class (objc_interface_context);
}
void
objc_finish_interface (void)
{
finish_class (objc_interface_context);
objc_interface_context = NULL_TREE;
}
void
objc_start_class_implementation (tree klass, tree super_class)
{
objc_implementation_context
= objc_ivar_context
= start_class (CLASS_IMPLEMENTATION_TYPE, klass, super_class, NULL_TREE);
objc_public_flag = 0;
}
void
objc_start_category_implementation (tree klass, tree categ)
{
objc_implementation_context
= start_class (CATEGORY_IMPLEMENTATION_TYPE, klass, categ, NULL_TREE);
objc_ivar_chain
= continue_class (objc_implementation_context);
}
void
objc_continue_implementation (void)
{
objc_ivar_chain
= continue_class (objc_implementation_context);
}
void
objc_finish_implementation (void)
{
#ifdef OBJCPLUS
if (flag_objc_call_cxx_cdtors)
objc_generate_cxx_cdtors ();
#endif
if (objc_implementation_context)
{
finish_class (objc_implementation_context);
objc_ivar_chain = NULL_TREE;
objc_implementation_context = NULL_TREE;
}
else
warning (0, "%<@end%> must appear in an @implementation context");
}
void
objc_set_visibility (int visibility)
{
objc_public_flag = visibility;
}
void
objc_set_method_type (enum tree_code type)
{
objc_inherit_code = (type == PLUS_EXPR
? CLASS_METHOD_DECL
: INSTANCE_METHOD_DECL);
}
tree
objc_build_method_signature (tree rettype, tree selector,
tree optparms, bool ellipsis)
{
return build_method_decl (objc_inherit_code, rettype, selector,
optparms, ellipsis);
}
void
objc_add_method_declaration (tree decl)
{
if (!objc_interface_context)
fatal_error ("method declaration not in @interface context");
objc_add_method (objc_interface_context,
decl,
objc_inherit_code == CLASS_METHOD_DECL);
}
void
objc_start_method_definition (tree decl)
{
if (!objc_implementation_context)
fatal_error ("method definition not in @implementation context");
objc_add_method (objc_implementation_context,
decl,
objc_inherit_code == CLASS_METHOD_DECL);
start_method_def (decl);
}
void
objc_add_instance_variable (tree decl)
{
(void) add_instance_variable (objc_ivar_context,
objc_public_flag,
decl);
}
/* Return 1 if IDENT is an ObjC/ObjC++ reserved keyword in the context of
an '@'. */
int
objc_is_reserved_word (tree ident)
{
unsigned char code = C_RID_CODE (ident);
return (OBJC_IS_AT_KEYWORD (code)
|| code == RID_CLASS || code == RID_PUBLIC
|| code == RID_PROTECTED || code == RID_PRIVATE
|| code == RID_TRY || code == RID_THROW || code == RID_CATCH);
}
/* Return true if TYPE is 'id'. */
static bool
objc_is_object_id (tree type)
{
return OBJC_TYPE_NAME (type) == objc_object_id;
}
static bool
objc_is_class_id (tree type)
{
return OBJC_TYPE_NAME (type) == objc_class_id;
}
/* Construct a C struct with same name as KLASS, a base struct with tag
SUPER_NAME (if any), and FIELDS indicated. */
static tree
objc_build_struct (tree klass, tree fields, tree super_name)
{
tree name = CLASS_NAME (klass);
tree s = start_struct (RECORD_TYPE, name);
tree super = (super_name ? xref_tag (RECORD_TYPE, super_name) : NULL_TREE);
tree t, objc_info = NULL_TREE;
if (super)
{
/* Prepend a packed variant of the base class into the layout. This
is necessary to preserve ObjC ABI compatibility. */
tree base = build_decl (FIELD_DECL, NULL_TREE, super);
tree field = TYPE_FIELDS (super);
while (field && TREE_CHAIN (field)
&& TREE_CODE (TREE_CHAIN (field)) == FIELD_DECL)
field = TREE_CHAIN (field);
/* For ObjC ABI purposes, the "packed" size of a base class is
the sum of the offset and the size (in bits) of the last field
in the class. */
DECL_SIZE (base)
= (field && TREE_CODE (field) == FIELD_DECL
? size_binop (PLUS_EXPR,
size_binop (PLUS_EXPR,
size_binop
(MULT_EXPR,
convert (bitsizetype,
DECL_FIELD_OFFSET (field)),
bitsize_int (BITS_PER_UNIT)),
DECL_FIELD_BIT_OFFSET (field)),
DECL_SIZE (field))
: bitsize_zero_node);
DECL_SIZE_UNIT (base)
= size_binop (FLOOR_DIV_EXPR, convert (sizetype, DECL_SIZE (base)),
size_int (BITS_PER_UNIT));
DECL_ARTIFICIAL (base) = 1;
DECL_ALIGN (base) = 1;
DECL_FIELD_CONTEXT (base) = s;
#ifdef OBJCPLUS
DECL_FIELD_IS_BASE (base) = 1;
if (fields)
TREE_NO_WARNING (fields) = 1; /* Suppress C++ ABI warnings -- we */
#endif /* are following the ObjC ABI here. */
TREE_CHAIN (base) = fields;
fields = base;
}
/* NB: Calling finish_struct() may cause type TYPE_LANG_SPECIFIC fields
in all variants of this RECORD_TYPE to be clobbered, but it is therein
that we store protocol conformance info (e.g., 'NSObject <MyProtocol>').
Hence, we must squirrel away the ObjC-specific information before calling
finish_struct(), and then reinstate it afterwards. */
for (t = TYPE_NEXT_VARIANT (s); t; t = TYPE_NEXT_VARIANT (t))
objc_info
= chainon (objc_info,
build_tree_list (NULL_TREE, TYPE_OBJC_INFO (t)));
/* Point the struct at its related Objective-C class. */
INIT_TYPE_OBJC_INFO (s);
TYPE_OBJC_INTERFACE (s) = klass;
s = finish_struct (s, fields, NULL_TREE);
for (t = TYPE_NEXT_VARIANT (s); t;
t = TYPE_NEXT_VARIANT (t), objc_info = TREE_CHAIN (objc_info))
{
TYPE_OBJC_INFO (t) = TREE_VALUE (objc_info);
/* Replace the IDENTIFIER_NODE with an actual @interface. */
TYPE_OBJC_INTERFACE (t) = klass;
}
/* Use TYPE_BINFO structures to point at the super class, if any. */
objc_xref_basetypes (s, super);
/* Mark this struct as a class template. */
CLASS_STATIC_TEMPLATE (klass) = s;
return s;
}
/* Build a type differing from TYPE only in that TYPE_VOLATILE is set.
Unlike tree.c:build_qualified_type(), preserve TYPE_LANG_SPECIFIC in the
process. */
static tree
objc_build_volatilized_type (tree type)
{
tree t;
/* Check if we have not constructed the desired variant already. */
for (t = TYPE_MAIN_VARIANT (type); t; t = TYPE_NEXT_VARIANT (t))
{
/* The type qualifiers must (obviously) match up. */
if (!TYPE_VOLATILE (t)
|| (TYPE_READONLY (t) != TYPE_READONLY (type))
|| (TYPE_RESTRICT (t) != TYPE_RESTRICT (type)))
continue;
/* For pointer types, the pointees (and hence their TYPE_LANG_SPECIFIC
info, if any) must match up. */
if (POINTER_TYPE_P (t)
&& (TREE_TYPE (t) != TREE_TYPE (type)))
continue;
/* Everything matches up! */
return t;
}
/* Ok, we could not re-use any of the pre-existing variants. Create
a new one. */
t = build_variant_type_copy (type);
TYPE_VOLATILE (t) = 1;
/* Set up the canonical type information. */
if (TYPE_STRUCTURAL_EQUALITY_P (type))
SET_TYPE_STRUCTURAL_EQUALITY (t);
else if (TYPE_CANONICAL (type) != type)
TYPE_CANONICAL (t) = objc_build_volatilized_type (TYPE_CANONICAL (type));
else
TYPE_CANONICAL (t) = t;
return t;
}
/* Mark DECL as being 'volatile' for purposes of Darwin
_setjmp()/_longjmp() exception handling. Called from
objc_mark_locals_volatile(). */
void
objc_volatilize_decl (tree decl)
{
/* Do not mess with variables that are 'static' or (already)
'volatile'. */
if (!TREE_THIS_VOLATILE (decl) && !TREE_STATIC (decl)
&& (TREE_CODE (decl) == VAR_DECL
|| TREE_CODE (decl) == PARM_DECL))
{
tree t = TREE_TYPE (decl);
struct volatilized_type key;
void **loc;
t = objc_build_volatilized_type (t);
key.type = t;
loc = htab_find_slot (volatilized_htab, &key, INSERT);
if (!*loc)
{
*loc = ggc_alloc (sizeof (key));
((struct volatilized_type *) *loc)->type = t;
}
TREE_TYPE (decl) = t;
TREE_THIS_VOLATILE (decl) = 1;
TREE_SIDE_EFFECTS (decl) = 1;
DECL_REGISTER (decl) = 0;
#ifndef OBJCPLUS
C_DECL_REGISTER (decl) = 0;
#endif
}
}
/* Check if protocol PROTO is adopted (directly or indirectly) by class CLS
(including its categories and superclasses) or by object type TYP.
Issue a warning if PROTO is not adopted anywhere and WARN is set. */
static bool
objc_lookup_protocol (tree proto, tree cls, tree typ, bool warn)
{
bool class_type = (cls != NULL_TREE);
while (cls)
{
tree c;
/* Check protocols adopted by the class and its categories. */
for (c = cls; c; c = CLASS_CATEGORY_LIST (c))
{
if (lookup_protocol_in_reflist (CLASS_PROTOCOL_LIST (c), proto))
return true;
}
/* Repeat for superclasses. */
cls = lookup_interface (CLASS_SUPER_NAME (cls));
}
/* Check for any protocols attached directly to the object type. */
if (TYPE_HAS_OBJC_INFO (typ))
{
if (lookup_protocol_in_reflist (TYPE_OBJC_PROTOCOL_LIST (typ), proto))
return true;
}
if (warn)
{
strcpy (errbuf, class_type ? "class \'" : "type \'");
gen_type_name_0 (class_type ? typ : TYPE_POINTER_TO (typ));
strcat (errbuf, "\' does not ");
/* NB: Types 'id' and 'Class' cannot reasonably be described as
"implementing" a given protocol, since they do not have an
implementation. */
strcat (errbuf, class_type ? "implement" : "conform to");
strcat (errbuf, " the \'");
strcat (errbuf, IDENTIFIER_POINTER (PROTOCOL_NAME (proto)));
strcat (errbuf, "\' protocol");
warning (0, errbuf);
}
return false;
}
/* Check if class RCLS and instance struct type RTYP conform to at least the
same protocols that LCLS and LTYP conform to. */
static bool
objc_compare_protocols (tree lcls, tree ltyp, tree rcls, tree rtyp, bool warn)
{
tree p;
bool have_lproto = false;
while (lcls)
{
/* NB: We do _not_ look at categories defined for LCLS; these may or
may not get loaded in, and therefore it is unreasonable to require
that RCLS/RTYP must implement any of their protocols. */
for (p = CLASS_PROTOCOL_LIST (lcls); p; p = TREE_CHAIN (p))
{
have_lproto = true;
if (!objc_lookup_protocol (TREE_VALUE (p), rcls, rtyp, warn))
return warn;
}
/* Repeat for superclasses. */
lcls = lookup_interface (CLASS_SUPER_NAME (lcls));
}
/* Check for any protocols attached directly to the object type. */
if (TYPE_HAS_OBJC_INFO (ltyp))
{
for (p = TYPE_OBJC_PROTOCOL_LIST (ltyp); p; p = TREE_CHAIN (p))
{
have_lproto = true;
if (!objc_lookup_protocol (TREE_VALUE (p), rcls, rtyp, warn))
return warn;
}
}
/* NB: If LTYP and LCLS have no protocols to search for, return 'true'
vacuously, _unless_ RTYP is a protocol-qualified 'id'. We can get
away with simply checking for 'id' or 'Class' (!RCLS), since this
routine will not get called in other cases. */
return have_lproto || (rcls != NULL_TREE);
}
/* Determine if it is permissible to assign (if ARGNO is greater than -3)
an instance of RTYP to an instance of LTYP or to compare the two
(if ARGNO is equal to -3), per ObjC type system rules. Before
returning 'true', this routine may issue warnings related to, e.g.,
protocol conformance. When returning 'false', the routine must
produce absolutely no warnings; the C or C++ front-end will do so
instead, if needed. If either LTYP or RTYP is not an Objective-C type,
the routine must return 'false'.
The ARGNO parameter is encoded as follows:
>= 1 Parameter number (CALLEE contains function being called);
0 Return value;
-1 Assignment;
-2 Initialization;
-3 Comparison (LTYP and RTYP may match in either direction). */
bool
objc_compare_types (tree ltyp, tree rtyp, int argno, tree callee)
{
tree lcls, rcls, lproto, rproto;
bool pointers_compatible;
/* We must be dealing with pointer types */
if (!POINTER_TYPE_P (ltyp) || !POINTER_TYPE_P (rtyp))
return false;
do
{
ltyp = TREE_TYPE (ltyp); /* Remove indirections. */
rtyp = TREE_TYPE (rtyp);
}
while (POINTER_TYPE_P (ltyp) && POINTER_TYPE_P (rtyp));
/* Past this point, we are only interested in ObjC class instances,
or 'id' or 'Class'. */
if (TREE_CODE (ltyp) != RECORD_TYPE || TREE_CODE (rtyp) != RECORD_TYPE)
return false;
if (!objc_is_object_id (ltyp) && !objc_is_class_id (ltyp)
&& !TYPE_HAS_OBJC_INFO (ltyp))
return false;
if (!objc_is_object_id (rtyp) && !objc_is_class_id (rtyp)
&& !TYPE_HAS_OBJC_INFO (rtyp))
return false;
/* Past this point, we are committed to returning 'true' to the caller.
However, we can still warn about type and/or protocol mismatches. */
if (TYPE_HAS_OBJC_INFO (ltyp))
{
lcls = TYPE_OBJC_INTERFACE (ltyp);
lproto = TYPE_OBJC_PROTOCOL_LIST (ltyp);
}
else
lcls = lproto = NULL_TREE;
if (TYPE_HAS_OBJC_INFO (rtyp))
{
rcls = TYPE_OBJC_INTERFACE (rtyp);
rproto = TYPE_OBJC_PROTOCOL_LIST (rtyp);
}
else
rcls = rproto = NULL_TREE;
/* If we could not find an @interface declaration, we must have
only seen a @class declaration; for purposes of type comparison,
treat it as a stand-alone (root) class. */
if (lcls && TREE_CODE (lcls) == IDENTIFIER_NODE)
lcls = NULL_TREE;
if (rcls && TREE_CODE (rcls) == IDENTIFIER_NODE)
rcls = NULL_TREE;
/* If either type is an unqualified 'id', we're done. */
if ((!lproto && objc_is_object_id (ltyp))
|| (!rproto && objc_is_object_id (rtyp)))
return true;
pointers_compatible = (TYPE_MAIN_VARIANT (ltyp) == TYPE_MAIN_VARIANT (rtyp));
/* If the underlying types are the same, and at most one of them has
a protocol list, we do not need to issue any diagnostics. */
if (pointers_compatible && (!lproto || !rproto))
return true;
/* If exactly one of the types is 'Class', issue a diagnostic; any
exceptions of this rule have already been handled. */
if (objc_is_class_id (ltyp) ^ objc_is_class_id (rtyp))
pointers_compatible = false;
/* Otherwise, check for inheritance relations. */
else
{
if (!pointers_compatible)
pointers_compatible
= (objc_is_object_id (ltyp) || objc_is_object_id (rtyp));
if (!pointers_compatible)
pointers_compatible = DERIVED_FROM_P (ltyp, rtyp);
if (!pointers_compatible && argno == -3)
pointers_compatible = DERIVED_FROM_P (rtyp, ltyp);
}
/* If the pointers match modulo protocols, check for protocol conformance
mismatches. */
if (pointers_compatible)
{
pointers_compatible = objc_compare_protocols (lcls, ltyp, rcls, rtyp,
argno != -3);
if (!pointers_compatible && argno == -3)
pointers_compatible = objc_compare_protocols (rcls, rtyp, lcls, ltyp,
argno != -3);
}
if (!pointers_compatible)
{
/* NB: For the time being, we shall make our warnings look like their
C counterparts. In the future, we may wish to make them more
ObjC-specific. */
switch (argno)
{
case -3:
warning (0, "comparison of distinct Objective-C types lacks a cast");
break;
case -2:
warning (0, "initialization from distinct Objective-C type");
break;
case -1:
warning (0, "assignment from distinct Objective-C type");
break;
case 0:
warning (0, "distinct Objective-C type in return");
break;
default:
warning (0, "passing argument %d of %qE from distinct "
"Objective-C type", argno, callee);
break;
}
}
return true;
}
/* Check if LTYP and RTYP have the same type qualifiers. If either type
lives in the volatilized hash table, ignore the 'volatile' bit when
making the comparison. */
bool
objc_type_quals_match (tree ltyp, tree rtyp)
{
int lquals = TYPE_QUALS (ltyp), rquals = TYPE_QUALS (rtyp);
struct volatilized_type key;
key.type = ltyp;
if (htab_find_slot (volatilized_htab, &key, NO_INSERT))
lquals &= ~TYPE_QUAL_VOLATILE;
key.type = rtyp;
if (htab_find_slot (volatilized_htab, &key, NO_INSERT))
rquals &= ~TYPE_QUAL_VOLATILE;
return (lquals == rquals);
}
#ifndef OBJCPLUS
/* Determine if CHILD is derived from PARENT. The routine assumes that
both parameters are RECORD_TYPEs, and is non-reflexive. */
static bool
objc_derived_from_p (tree parent, tree child)
{
parent = TYPE_MAIN_VARIANT (parent);
for (child = TYPE_MAIN_VARIANT (child);
TYPE_BINFO (child) && BINFO_N_BASE_BINFOS (TYPE_BINFO (child));)
{
child = TYPE_MAIN_VARIANT (BINFO_TYPE (BINFO_BASE_BINFO
(TYPE_BINFO (child),
0)));
if (child == parent)
return true;
}
return false;
}
#endif
static tree
objc_build_component_ref (tree datum, tree component)
{
/* If COMPONENT is NULL, the caller is referring to the anonymous
base class field. */
if (!component)
{
tree base = TYPE_FIELDS (TREE_TYPE (datum));
return build3 (COMPONENT_REF, TREE_TYPE (base), datum, base, NULL_TREE);
}
/* The 'build_component_ref' routine has been removed from the C++
front-end, but 'finish_class_member_access_expr' seems to be
a worthy substitute. */
#ifdef OBJCPLUS
return finish_class_member_access_expr (datum, component, false,
tf_warning_or_error);
#else
return build_component_ref (datum, component);
#endif
}
/* Recursively copy inheritance information rooted at BINFO. To do this,
we emulate the song and dance performed by cp/tree.c:copy_binfo(). */
static tree
objc_copy_binfo (tree binfo)
{
tree btype = BINFO_TYPE (binfo);
tree binfo2 = make_tree_binfo (BINFO_N_BASE_BINFOS (binfo));
tree base_binfo;
int ix;
BINFO_TYPE (binfo2) = btype;
BINFO_OFFSET (binfo2) = BINFO_OFFSET (binfo);
BINFO_BASE_ACCESSES (binfo2) = BINFO_BASE_ACCESSES (binfo);
/* Recursively copy base binfos of BINFO. */
for (ix = 0; BINFO_BASE_ITERATE (binfo, ix, base_binfo); ix++)
{
tree base_binfo2 = objc_copy_binfo (base_binfo);
BINFO_INHERITANCE_CHAIN (base_binfo2) = binfo2;
BINFO_BASE_APPEND (binfo2, base_binfo2);
}
return binfo2;
}
/* Record superclass information provided in BASETYPE for ObjC class REF.
This is loosely based on cp/decl.c:xref_basetypes(). */
static void
objc_xref_basetypes (tree ref, tree basetype)
{
tree binfo = make_tree_binfo (basetype ? 1 : 0);
TYPE_BINFO (ref) = binfo;
BINFO_OFFSET (binfo) = size_zero_node;
BINFO_TYPE (binfo) = ref;
if (basetype)
{
tree base_binfo = objc_copy_binfo (TYPE_BINFO (basetype));
BINFO_INHERITANCE_CHAIN (base_binfo) = binfo;
BINFO_BASE_ACCESSES (binfo) = VEC_alloc (tree, gc, 1);
BINFO_BASE_APPEND (binfo, base_binfo);
BINFO_BASE_ACCESS_APPEND (binfo, access_public_node);
}
}
static hashval_t
volatilized_hash (const void *ptr)
{
const_tree const typ = ((const struct volatilized_type *)ptr)->type;
return htab_hash_pointer(typ);
}
static int
volatilized_eq (const void *ptr1, const void *ptr2)
{
const_tree const typ1 = ((const struct volatilized_type *)ptr1)->type;
const_tree const typ2 = ((const struct volatilized_type *)ptr2)->type;
return typ1 == typ2;
}
/* Called from finish_decl. */
void
objc_check_decl (tree decl)
{
tree type = TREE_TYPE (decl);
if (TREE_CODE (type) != RECORD_TYPE)
return;
if (OBJC_TYPE_NAME (type) && (type = objc_is_class_name (OBJC_TYPE_NAME (type))))
error ("statically allocated instance of Objective-C class %qs",
IDENTIFIER_POINTER (type));
}
/* Construct a PROTOCOLS-qualified variant of INTERFACE, where INTERFACE may
either name an Objective-C class, or refer to the special 'id' or 'Class'
types. If INTERFACE is not a valid ObjC type, just return it unchanged. */
tree
objc_get_protocol_qualified_type (tree interface, tree protocols)
{
/* If INTERFACE is not provided, default to 'id'. */
tree type = (interface ? objc_is_id (interface) : objc_object_type);
bool is_ptr = (type != NULL_TREE);
if (!is_ptr)
{
type = objc_is_class_name (interface);
if (type)
type = xref_tag (RECORD_TYPE, type);
else
return interface;
}
if (protocols)
{
type = build_variant_type_copy (type);
/* For pointers (i.e., 'id' or 'Class'), attach the protocol(s)
to the pointee. */
if (is_ptr)
{
tree orig_pointee_type = TREE_TYPE (type);
TREE_TYPE (type) = build_variant_type_copy (orig_pointee_type);
/* Set up the canonical type information. */
TYPE_CANONICAL (type)
= TYPE_CANONICAL (TYPE_POINTER_TO (orig_pointee_type));
TYPE_POINTER_TO (TREE_TYPE (type)) = type;
type = TREE_TYPE (type);
}
/* Look up protocols and install in lang specific list. */
DUP_TYPE_OBJC_INFO (type, TYPE_MAIN_VARIANT (type));
TYPE_OBJC_PROTOCOL_LIST (type) = lookup_and_install_protocols (protocols);
/* For RECORD_TYPEs, point to the @interface; for 'id' and 'Class',
return the pointer to the new pointee variant. */
if (is_ptr)
type = TYPE_POINTER_TO (type);
else
TYPE_OBJC_INTERFACE (type)
= TYPE_OBJC_INTERFACE (TYPE_MAIN_VARIANT (type));
}
return type;
}
/* Check for circular dependencies in protocols. The arguments are
PROTO, the protocol to check, and LIST, a list of protocol it
conforms to. */
static void
check_protocol_recursively (tree proto, tree list)
{
tree p;
for (p = list; p; p = TREE_CHAIN (p))
{
tree pp = TREE_VALUE (p);
if (TREE_CODE (pp) == IDENTIFIER_NODE)
pp = lookup_protocol (pp);
if (pp == proto)
fatal_error ("protocol %qs has circular dependency",
IDENTIFIER_POINTER (PROTOCOL_NAME (pp)));
if (pp)
check_protocol_recursively (proto, PROTOCOL_LIST (pp));
}
}
/* Look up PROTOCOLS, and return a list of those that are found.
If none are found, return NULL. */
static tree
lookup_and_install_protocols (tree protocols)
{
tree proto;
tree return_value = NULL_TREE;
for (proto = protocols; proto; proto = TREE_CHAIN (proto))
{
tree ident = TREE_VALUE (proto);
tree p = lookup_protocol (ident);
if (p)
return_value = chainon (return_value,
build_tree_list (NULL_TREE, p));
else if (ident != error_mark_node)
error ("cannot find protocol declaration for %qs",
IDENTIFIER_POINTER (ident));
}
return return_value;
}
/* Create a declaration for field NAME of a given TYPE. */
static tree
create_field_decl (tree type, const char *name)
{
return build_decl (FIELD_DECL, get_identifier (name), type);
}
/* Create a global, static declaration for variable NAME of a given TYPE. The
finish_var_decl() routine will need to be called on it afterwards. */
static tree
start_var_decl (tree type, const char *name)
{
tree var = build_decl (VAR_DECL, get_identifier (name), type);
TREE_STATIC (var) = 1;
DECL_INITIAL (var) = error_mark_node; /* A real initializer is coming... */
DECL_IGNORED_P (var) = 1;
DECL_ARTIFICIAL (var) = 1;
DECL_CONTEXT (var) = NULL_TREE;
#ifdef OBJCPLUS
DECL_THIS_STATIC (var) = 1; /* squash redeclaration errors */
#endif
return var;
}
/* Finish off the variable declaration created by start_var_decl(). */
static void
finish_var_decl (tree var, tree initializer)
{
finish_decl (var, initializer, NULL_TREE);
/* Ensure that the variable actually gets output. */
mark_decl_referenced (var);
/* Mark the decl to avoid "defined but not used" warning. */
TREE_USED (var) = 1;
}
/* Find the decl for the constant string class reference. This is only
used for the NeXT runtime. */
static tree
setup_string_decl (void)
{
char *name;
size_t length;
/* %s in format will provide room for terminating null */
length = strlen (STRING_OBJECT_GLOBAL_FORMAT)
+ strlen (constant_string_class_name);
name = XNEWVEC (char, length);
sprintf (name, STRING_OBJECT_GLOBAL_FORMAT,
constant_string_class_name);
constant_string_global_id = get_identifier (name);
string_class_decl = lookup_name (constant_string_global_id);
return string_class_decl;
}
/* Purpose: "play" parser, creating/installing representations
of the declarations that are required by Objective-C.
Model:
type_spec--------->sc_spec
(tree_list) (tree_list)
| |
| |
identifier_node identifier_node */
static void
synth_module_prologue (void)
{
tree type;
enum debug_info_type save_write_symbols = write_symbols;
const struct gcc_debug_hooks *const save_hooks = debug_hooks;
/* Suppress outputting debug symbols, because
dbxout_init hasn't been called yet. */
write_symbols = NO_DEBUG;
debug_hooks = &do_nothing_debug_hooks;
#ifdef OBJCPLUS
push_lang_context (lang_name_c); /* extern "C" */
#endif
/* The following are also defined in <objc/objc.h> and friends. */
objc_object_id = get_identifier (TAG_OBJECT);
objc_class_id = get_identifier (TAG_CLASS);
objc_object_reference = xref_tag (RECORD_TYPE, objc_object_id);
objc_class_reference = xref_tag (RECORD_TYPE, objc_class_id);
objc_object_type = build_pointer_type (objc_object_reference);
objc_class_type = build_pointer_type (objc_class_reference);
objc_object_name = get_identifier (OBJECT_TYPEDEF_NAME);
objc_class_name = get_identifier (CLASS_TYPEDEF_NAME);
/* Declare the 'id' and 'Class' typedefs. */
type = lang_hooks.decls.pushdecl (build_decl (TYPE_DECL,
objc_object_name,
objc_object_type));
TREE_NO_WARNING (type) = 1;
type = lang_hooks.decls.pushdecl (build_decl (TYPE_DECL,
objc_class_name,
objc_class_type));
TREE_NO_WARNING (type) = 1;
/* Forward-declare '@interface Protocol'. */
type = get_identifier (PROTOCOL_OBJECT_CLASS_NAME);
objc_declare_class (tree_cons (NULL_TREE, type, NULL_TREE));
objc_protocol_type = build_pointer_type (xref_tag (RECORD_TYPE,
type));
/* Declare type of selector-objects that represent an operation name. */
if (flag_next_runtime)
/* `struct objc_selector *' */
objc_selector_type
= build_pointer_type (xref_tag (RECORD_TYPE,
get_identifier (TAG_SELECTOR)));
else
/* `const struct objc_selector *' */
objc_selector_type
= build_pointer_type
(build_qualified_type (xref_tag (RECORD_TYPE,
get_identifier (TAG_SELECTOR)),
TYPE_QUAL_CONST));
/* Declare receiver type used for dispatching messages to 'super'. */
/* `struct objc_super *' */
objc_super_type = build_pointer_type (xref_tag (RECORD_TYPE,
get_identifier (TAG_SUPER)));
/* Declare pointers to method and ivar lists. */
objc_method_list_ptr = build_pointer_type
(xref_tag (RECORD_TYPE,
get_identifier (UTAG_METHOD_LIST)));
objc_method_proto_list_ptr
= build_pointer_type (xref_tag (RECORD_TYPE,
get_identifier (UTAG_METHOD_PROTOTYPE_LIST)));
objc_ivar_list_ptr = build_pointer_type
(xref_tag (RECORD_TYPE,
get_identifier (UTAG_IVAR_LIST)));
/* TREE_NOTHROW is cleared for the message-sending functions,
because the function that gets called can throw in Obj-C++, or
could itself call something that can throw even in Obj-C. */
if (flag_next_runtime)
{
/* NB: In order to call one of the ..._stret (struct-returning)
functions, the function *MUST* first be cast to a signature that
corresponds to the actual ObjC method being invoked. This is
what is done by the build_objc_method_call() routine below. */
/* id objc_msgSend (id, SEL, ...); */
/* id objc_msgSendNonNil (id, SEL, ...); */
/* id objc_msgSend_stret (id, SEL, ...); */
/* id objc_msgSendNonNil_stret (id, SEL, ...); */
type
= build_function_type (objc_object_type,
tree_cons (NULL_TREE, objc_object_type,
tree_cons (NULL_TREE, objc_selector_type,
NULL_TREE)));
umsg_decl = add_builtin_function (TAG_MSGSEND,
type, 0, NOT_BUILT_IN,
NULL, NULL_TREE);
umsg_nonnil_decl = add_builtin_function (TAG_MSGSEND_NONNIL,
type, 0, NOT_BUILT_IN,
NULL, NULL_TREE);
umsg_stret_decl = add_builtin_function (TAG_MSGSEND_STRET,
type, 0, NOT_BUILT_IN,
NULL, NULL_TREE);
umsg_nonnil_stret_decl = add_builtin_function (TAG_MSGSEND_NONNIL_STRET,
type, 0, NOT_BUILT_IN,
NULL, NULL_TREE);
/* These can throw, because the function that gets called can throw
in Obj-C++, or could itself call something that can throw even
in Obj-C. */
TREE_NOTHROW (umsg_decl) = 0;
TREE_NOTHROW (umsg_nonnil_decl) = 0;
TREE_NOTHROW (umsg_stret_decl) = 0;
TREE_NOTHROW (umsg_nonnil_stret_decl) = 0;
/* id objc_msgSend_Fast (id, SEL, ...)
__attribute__ ((hard_coded_address (OFFS_MSGSEND_FAST))); */
#ifdef OFFS_MSGSEND_FAST
umsg_fast_decl = add_builtin_function (TAG_MSGSEND_FAST,
type, 0, NOT_BUILT_IN,
NULL, NULL_TREE);
TREE_NOTHROW (umsg_fast_decl) = 0;
DECL_ATTRIBUTES (umsg_fast_decl)
= tree_cons (get_identifier ("hard_coded_address"),
build_int_cst (NULL_TREE, OFFS_MSGSEND_FAST),
NULL_TREE);
#else
/* No direct dispatch available. */
umsg_fast_decl = umsg_decl;
#endif
/* id objc_msgSendSuper (struct objc_super *, SEL, ...); */
/* id objc_msgSendSuper_stret (struct objc_super *, SEL, ...); */
type
= build_function_type (objc_object_type,
tree_cons (NULL_TREE, objc_super_type,
tree_cons (NULL_TREE, objc_selector_type,
NULL_TREE)));
umsg_super_decl = add_builtin_function (TAG_MSGSENDSUPER,
type, 0, NOT_BUILT_IN,
NULL, NULL_TREE);
umsg_super_stret_decl = add_builtin_function (TAG_MSGSENDSUPER_STRET,
type, 0, NOT_BUILT_IN, 0,
NULL_TREE);
TREE_NOTHROW (umsg_super_decl) = 0;
TREE_NOTHROW (umsg_super_stret_decl) = 0;
}
else
{
/* GNU runtime messenger entry points. */
/* typedef id (*IMP)(id, SEL, ...); */
tree IMP_type
= build_pointer_type
(build_function_type (objc_object_type,
tree_cons (NULL_TREE, objc_object_type,
tree_cons (NULL_TREE, objc_selector_type,
NULL_TREE))));
/* IMP objc_msg_lookup (id, SEL); */
type
= build_function_type (IMP_type,
tree_cons (NULL_TREE, objc_object_type,
tree_cons (NULL_TREE, objc_selector_type,
OBJC_VOID_AT_END)));
umsg_decl = add_builtin_function (TAG_MSGSEND,
type, 0, NOT_BUILT_IN,
NULL, NULL_TREE);
TREE_NOTHROW (umsg_decl) = 0;
/* IMP objc_msg_lookup_super (struct objc_super *, SEL); */
type
= build_function_type (IMP_type,
tree_cons (NULL_TREE, objc_super_type,
tree_cons (NULL_TREE, objc_selector_type,
OBJC_VOID_AT_END)));
umsg_super_decl = add_builtin_function (TAG_MSGSENDSUPER,
type, 0, NOT_BUILT_IN,
NULL, NULL_TREE);
TREE_NOTHROW (umsg_super_decl) = 0;
/* The following GNU runtime entry point is called to initialize
each module:
__objc_exec_class (void *); */
type
= build_function_type (void_type_node,
tree_cons (NULL_TREE, ptr_type_node,
OBJC_VOID_AT_END));
execclass_decl = add_builtin_function (TAG_EXECCLASS,
type, 0, NOT_BUILT_IN,
NULL, NULL_TREE);
}
/* id objc_getClass (const char *); */
type = build_function_type (objc_object_type,
tree_cons (NULL_TREE,
const_string_type_node,
OBJC_VOID_AT_END));
objc_get_class_decl
= add_builtin_function (TAG_GETCLASS, type, 0, NOT_BUILT_IN,
NULL, NULL_TREE);
/* id objc_getMetaClass (const char *); */
objc_get_meta_class_decl
= add_builtin_function (TAG_GETMETACLASS, type, 0, NOT_BUILT_IN, NULL, NULL_TREE);
build_class_template ();
build_super_template ();
build_protocol_template ();
build_category_template ();
build_objc_exception_stuff ();
if (flag_next_runtime)
build_next_objc_exception_stuff ();
/* static SEL _OBJC_SELECTOR_TABLE[]; */
if (! flag_next_runtime)
build_selector_table_decl ();
/* Forward declare constant_string_id and constant_string_type. */
if (!constant_string_class_name)
constant_string_class_name = default_constant_string_class_name;
constant_string_id = get_identifier (constant_string_class_name);
objc_declare_class (tree_cons (NULL_TREE, constant_string_id, NULL_TREE));
/* Pre-build the following entities - for speed/convenience. */
self_id = get_identifier ("self");
ucmd_id = get_identifier ("_cmd");
#ifdef OBJCPLUS
pop_lang_context ();
#endif
write_symbols = save_write_symbols;
debug_hooks = save_hooks;
}
/* Ensure that the ivar list for NSConstantString/NXConstantString
(or whatever was specified via `-fconstant-string-class')
contains fields at least as large as the following three, so that
the runtime can stomp on them with confidence:
struct STRING_OBJECT_CLASS_NAME
{
Object isa;
char *cString;
unsigned int length;
}; */
static int
check_string_class_template (void)
{
tree field_decl = objc_get_class_ivars (constant_string_id);
#define AT_LEAST_AS_LARGE_AS(F, T) \
(F && TREE_CODE (F) == FIELD_DECL \
&& (TREE_INT_CST_LOW (TYPE_SIZE (TREE_TYPE (F))) \
>= TREE_INT_CST_LOW (TYPE_SIZE (T))))
if (!AT_LEAST_AS_LARGE_AS (field_decl, ptr_type_node))
return 0;
field_decl = TREE_CHAIN (field_decl);
if (!AT_LEAST_AS_LARGE_AS (field_decl, ptr_type_node))
return 0;
field_decl = TREE_CHAIN (field_decl);
return AT_LEAST_AS_LARGE_AS (field_decl, unsigned_type_node);
#undef AT_LEAST_AS_LARGE_AS
}
/* Avoid calling `check_string_class_template ()' more than once. */
static GTY(()) int string_layout_checked;
/* Construct an internal string layout to be used as a template for
creating NSConstantString/NXConstantString instances. */
static tree
objc_build_internal_const_str_type (void)
{
tree type = (*lang_hooks.types.make_type) (RECORD_TYPE);
tree fields = build_decl (FIELD_DECL, NULL_TREE, ptr_type_node);
tree field = build_decl (FIELD_DECL, NULL_TREE, ptr_type_node);
TREE_CHAIN (field) = fields; fields = field;
field = build_decl (FIELD_DECL, NULL_TREE, unsigned_type_node);
TREE_CHAIN (field) = fields; fields = field;
/* NB: The finish_builtin_struct() routine expects FIELD_DECLs in
reverse order! */
finish_builtin_struct (type, "__builtin_ObjCString",
fields, NULL_TREE);
return type;
}
/* Custom build_string which sets TREE_TYPE! */
static tree
my_build_string (int len, const char *str)
{
return fix_string_type (build_string (len, str));
}
/* Build a string with contents STR and length LEN and convert it to a
pointer. */
static tree
my_build_string_pointer (int len, const char *str)
{
tree string = my_build_string (len, str);
tree ptrtype = build_pointer_type (TREE_TYPE (TREE_TYPE (string)));
return build1 (ADDR_EXPR, ptrtype, string);
}
static hashval_t
string_hash (const void *ptr)
{
const_tree const str = ((const struct string_descriptor *)ptr)->literal;
const unsigned char *p = (const unsigned char *) TREE_STRING_POINTER (str);
int i, len = TREE_STRING_LENGTH (str);
hashval_t h = len;
for (i = 0; i < len; i++)
h = ((h * 613) + p[i]);
return h;
}
static int
string_eq (const void *ptr1, const void *ptr2)
{
const_tree const str1 = ((const struct string_descriptor *)ptr1)->literal;
const_tree const str2 = ((const struct string_descriptor *)ptr2)->literal;
int len1 = TREE_STRING_LENGTH (str1);
return (len1 == TREE_STRING_LENGTH (str2)
&& !memcmp (TREE_STRING_POINTER (str1), TREE_STRING_POINTER (str2),
len1));
}
/* Given a chain of STRING_CST's, build a static instance of
NXConstantString which points at the concatenation of those
strings. We place the string object in the __string_objects
section of the __OBJC segment. The Objective-C runtime will
initialize the isa pointers of the string objects to point at the
NXConstantString class object. */
tree
objc_build_string_object (tree string)
{
tree initlist, constructor, constant_string_class;
int length;
tree fields, addr;
struct string_descriptor *desc, key;
void **loc;
/* Prep the string argument. */
string = fix_string_type (string);
TREE_SET_CODE (string, STRING_CST);
length = TREE_STRING_LENGTH (string) - 1;
/* Check whether the string class being used actually exists and has the
correct ivar layout. */
if (!string_layout_checked)
{
string_layout_checked = -1;
constant_string_class = lookup_interface (constant_string_id);
internal_const_str_type = objc_build_internal_const_str_type ();
if (!constant_string_class
|| !(constant_string_type
= CLASS_STATIC_TEMPLATE (constant_string_class)))
error ("cannot find interface declaration for %qs",
IDENTIFIER_POINTER (constant_string_id));
/* The NSConstantString/NXConstantString ivar layout is now known. */
else if (!check_string_class_template ())
error ("interface %qs does not have valid constant string layout",
IDENTIFIER_POINTER (constant_string_id));
/* For the NeXT runtime, we can generate a literal reference
to the string class, don't need to run a constructor. */
else if (flag_next_runtime && !setup_string_decl ())
error ("cannot find reference tag for class %qs",
IDENTIFIER_POINTER (constant_string_id));
else
{
string_layout_checked = 1; /* Success! */
add_class_reference (constant_string_id);
}
}
if (string_layout_checked == -1)
return error_mark_node;
/* Perhaps we already constructed a constant string just like this one? */
key.literal = string;
loc = htab_find_slot (string_htab, &key, INSERT);
desc = (struct string_descriptor *) *loc;
if (!desc)
{
tree var;
*loc = desc = GGC_NEW (struct string_descriptor);
desc->literal = string;
/* GNU: (NXConstantString *) & ((__builtin_ObjCString) { NULL, string, length }) */
/* NeXT: (NSConstantString *) & ((__builtin_ObjCString) { isa, string, length }) */
fields = TYPE_FIELDS (internal_const_str_type);
initlist
= build_tree_list (fields,
flag_next_runtime
? build_unary_op (input_location,
ADDR_EXPR, string_class_decl, 0)
: build_int_cst (NULL_TREE, 0));
fields = TREE_CHAIN (fields);
initlist = tree_cons (fields, build_unary_op (input_location,
ADDR_EXPR, string, 1),
initlist);
fields = TREE_CHAIN (fields);
initlist = tree_cons (fields, build_int_cst (NULL_TREE, length),
initlist);
constructor = objc_build_constructor (internal_const_str_type,
nreverse (initlist));
if (!flag_next_runtime)
constructor
= objc_add_static_instance (constructor, constant_string_type);
else
{
var = build_decl (CONST_DECL, NULL, TREE_TYPE (constructor));
DECL_INITIAL (var) = constructor;
TREE_STATIC (var) = 1;
pushdecl_top_level (var);
constructor = var;
}
desc->constructor = constructor;
}
addr = convert (build_pointer_type (constant_string_type),
build_unary_op (input_location,
ADDR_EXPR, desc->constructor, 1));
return addr;
}
/* Declare a static instance of CLASS_DECL initialized by CONSTRUCTOR. */
static GTY(()) int num_static_inst;
static tree
objc_add_static_instance (tree constructor, tree class_decl)
{
tree *chain, decl;
char buf[256];
/* Find the list of static instances for the CLASS_DECL. Create one if
not found. */
for (chain = &objc_static_instances;
*chain && TREE_VALUE (*chain) != class_decl;
chain = &TREE_CHAIN (*chain));
if (!*chain)
{
*chain = tree_cons (NULL_TREE, class_decl, NULL_TREE);
add_objc_string (OBJC_TYPE_NAME (class_decl), class_names);
}
sprintf (buf, "_OBJC_INSTANCE_%d", num_static_inst++);
decl = build_decl (VAR_DECL, get_identifier (buf), class_decl);
DECL_COMMON (decl) = 1;
TREE_STATIC (decl) = 1;
DECL_ARTIFICIAL (decl) = 1;
TREE_USED (decl) = 1;
DECL_INITIAL (decl) = constructor;
/* We may be writing something else just now.
Postpone till end of input. */
DECL_DEFER_OUTPUT (decl) = 1;
pushdecl_top_level (decl);
rest_of_decl_compilation (decl, 1, 0);
/* Add the DECL to the head of this CLASS' list. */
TREE_PURPOSE (*chain) = tree_cons (NULL_TREE, decl, TREE_PURPOSE (*chain));
return decl;
}
/* Build a static constant CONSTRUCTOR
with type TYPE and elements ELTS. */
static tree
objc_build_constructor (tree type, tree elts)
{
tree constructor = build_constructor_from_list (type, elts);
TREE_CONSTANT (constructor) = 1;
TREE_STATIC (constructor) = 1;
TREE_READONLY (constructor) = 1;
#ifdef OBJCPLUS
/* Adjust for impedance mismatch. We should figure out how to build
CONSTRUCTORs that consistently please both the C and C++ gods. */
if (!TREE_PURPOSE (elts))
TREE_TYPE (constructor) = init_list_type_node;
#endif
return constructor;
}
/* Take care of defining and initializing _OBJC_SYMBOLS. */
/* Predefine the following data type:
struct _objc_symtab
{
long sel_ref_cnt;
SEL *refs;
short cls_def_cnt;
short cat_def_cnt;
void *defs[cls_def_cnt + cat_def_cnt];
}; */
static void
build_objc_symtab_template (void)
{
tree field_decl, field_decl_chain;
objc_symtab_template
= start_struct (RECORD_TYPE, get_identifier (UTAG_SYMTAB));
/* long sel_ref_cnt; */
field_decl = create_field_decl (long_integer_type_node, "sel_ref_cnt");
field_decl_chain = field_decl;
/* SEL *refs; */
field_decl = create_field_decl (build_pointer_type (objc_selector_type),
"refs");
chainon (field_decl_chain, field_decl);
/* short cls_def_cnt; */
field_decl = create_field_decl (short_integer_type_node, "cls_def_cnt");
chainon (field_decl_chain, field_decl);
/* short cat_def_cnt; */
field_decl = create_field_decl (short_integer_type_node,
"cat_def_cnt");
chainon (field_decl_chain, field_decl);
if (imp_count || cat_count || !flag_next_runtime)
{
/* void *defs[imp_count + cat_count (+ 1)]; */
/* NB: The index is one less than the size of the array. */
int index = imp_count + cat_count
+ (flag_next_runtime? -1: 0);
field_decl = create_field_decl
(build_array_type
(ptr_type_node,
build_index_type (build_int_cst (NULL_TREE, index))),
"defs");
chainon (field_decl_chain, field_decl);
}
finish_struct (objc_symtab_template, field_decl_chain, NULL_TREE);
}
/* Create the initial value for the `defs' field of _objc_symtab.
This is a CONSTRUCTOR. */
static tree
init_def_list (tree type)
{
tree expr, initlist = NULL_TREE;
struct imp_entry *impent;
if (imp_count)
for (impent = imp_list; impent; impent = impent->next)
{
if (TREE_CODE (impent->imp_context) == CLASS_IMPLEMENTATION_TYPE)
{
expr = build_unary_op (input_location,
ADDR_EXPR, impent->class_decl, 0);
initlist = tree_cons (NULL_TREE, expr, initlist);
}
}
if (cat_count)
for (impent = imp_list; impent; impent = impent->next)
{
if (TREE_CODE (impent->imp_context) == CATEGORY_IMPLEMENTATION_TYPE)
{
expr = build_unary_op (input_location,
ADDR_EXPR, impent->class_decl, 0);
initlist = tree_cons (NULL_TREE, expr, initlist);
}
}
if (!flag_next_runtime)
{
/* statics = { ..., _OBJC_STATIC_INSTANCES, ... } */
tree expr;
if (static_instances_decl)
expr = build_unary_op (input_location,
ADDR_EXPR, static_instances_decl, 0);
else
expr = build_int_cst (NULL_TREE, 0);
initlist = tree_cons (NULL_TREE, expr, initlist);
}
return objc_build_constructor (type, nreverse (initlist));
}
/* Construct the initial value for all of _objc_symtab. */
static tree
init_objc_symtab (tree type)
{
tree initlist;
/* sel_ref_cnt = { ..., 5, ... } */
initlist = build_tree_list (NULL_TREE,
build_int_cst (long_integer_type_node, 0));
/* refs = { ..., _OBJC_SELECTOR_TABLE, ... } */
if (flag_next_runtime || ! sel_ref_chain)
initlist = tree_cons (NULL_TREE, build_int_cst (NULL_TREE, 0), initlist);
else
initlist
= tree_cons (NULL_TREE,
convert (build_pointer_type (objc_selector_type),
build_unary_op (input_location, ADDR_EXPR,
UOBJC_SELECTOR_TABLE_decl, 1)),
initlist);
/* cls_def_cnt = { ..., 5, ... } */
initlist = tree_cons (NULL_TREE, build_int_cst (NULL_TREE, imp_count), initlist);
/* cat_def_cnt = { ..., 5, ... } */
initlist = tree_cons (NULL_TREE, build_int_cst (NULL_TREE, cat_count), initlist);
/* cls_def = { ..., { &Foo, &Bar, ...}, ... } */
if (imp_count || cat_count || !flag_next_runtime)
{
tree field = TYPE_FIELDS (type);
field = TREE_CHAIN (TREE_CHAIN (TREE_CHAIN (TREE_CHAIN (field))));
initlist = tree_cons (NULL_TREE, init_def_list (TREE_TYPE (field)),
initlist);
}
return objc_build_constructor (type, nreverse (initlist));
}
/* Generate forward declarations for metadata such as
'OBJC_CLASS_...'. */
static tree
build_metadata_decl (const char *name, tree type)
{
tree decl;
/* struct TYPE NAME_<name>; */
decl = start_var_decl (type, synth_id_with_class_suffix
(name,
objc_implementation_context));
return decl;
}
/* Push forward-declarations of all the categories so that
init_def_list can use them in a CONSTRUCTOR. */
static void
forward_declare_categories (void)
{
struct imp_entry *impent;
tree sav = objc_implementation_context;
for (impent = imp_list; impent; impent = impent->next)
{
if (TREE_CODE (impent->imp_context) == CATEGORY_IMPLEMENTATION_TYPE)
{
/* Set an invisible arg to synth_id_with_class_suffix. */
objc_implementation_context = impent->imp_context;
/* extern struct objc_category _OBJC_CATEGORY_<name>; */
impent->class_decl = build_metadata_decl ("_OBJC_CATEGORY",
objc_category_template);
}
}
objc_implementation_context = sav;
}
/* Create the declaration of _OBJC_SYMBOLS, with type `struct _objc_symtab'
and initialized appropriately. */
static void
generate_objc_symtab_decl (void)
{
/* forward declare categories */
if (cat_count)
forward_declare_categories ();
build_objc_symtab_template ();
UOBJC_SYMBOLS_decl = start_var_decl (objc_symtab_template, "_OBJC_SYMBOLS");
finish_var_decl (UOBJC_SYMBOLS_decl,
init_objc_symtab (TREE_TYPE (UOBJC_SYMBOLS_decl)));
}
static tree
init_module_descriptor (tree type)
{
tree initlist, expr;
/* version = { 1, ... } */
expr = build_int_cst (long_integer_type_node, OBJC_VERSION);
initlist = build_tree_list (NULL_TREE, expr);
/* size = { ..., sizeof (struct _objc_module), ... } */
expr = convert (long_integer_type_node,
size_in_bytes (objc_module_template));
initlist = tree_cons (NULL_TREE, expr, initlist);
/* Don't provide any file name for security reasons. */
/* name = { ..., "", ... } */
expr = add_objc_string (get_identifier (""), class_names);
initlist = tree_cons (NULL_TREE, expr, initlist);
/* symtab = { ..., _OBJC_SYMBOLS, ... } */
if (UOBJC_SYMBOLS_decl)
expr = build_unary_op (input_location,
ADDR_EXPR, UOBJC_SYMBOLS_decl, 0);
else
expr = build_int_cst (NULL_TREE, 0);
initlist = tree_cons (NULL_TREE, expr, initlist);
return objc_build_constructor (type, nreverse (initlist));
}
/* Write out the data structures to describe Objective C classes defined.
struct _objc_module { ... } _OBJC_MODULE = { ... }; */
static void
build_module_descriptor (void)
{
tree field_decl, field_decl_chain;
#ifdef OBJCPLUS
push_lang_context (lang_name_c); /* extern "C" */
#endif
objc_module_template
= start_struct (RECORD_TYPE, get_identifier (UTAG_MODULE));
/* long version; */
field_decl = create_field_decl (long_integer_type_node, "version");
field_decl_chain = field_decl;
/* long size; */
field_decl = create_field_decl (long_integer_type_node, "size");
chainon (field_decl_chain, field_decl);
/* char *name; */
field_decl = create_field_decl (string_type_node, "name");
chainon (field_decl_chain, field_decl);
/* struct _objc_symtab *symtab; */
field_decl
= create_field_decl (build_pointer_type
(xref_tag (RECORD_TYPE,
get_identifier (UTAG_SYMTAB))),
"symtab");
chainon (field_decl_chain, field_decl);
finish_struct (objc_module_template, field_decl_chain, NULL_TREE);
/* Create an instance of "_objc_module". */
UOBJC_MODULES_decl = start_var_decl (objc_module_template, "_OBJC_MODULES");
finish_var_decl (UOBJC_MODULES_decl,
init_module_descriptor (TREE_TYPE (UOBJC_MODULES_decl)));
#ifdef OBJCPLUS
pop_lang_context ();
#endif
}
/* The GNU runtime requires us to provide a static initializer function
for each module:
static void __objc_gnu_init (void) {
__objc_exec_class (&L_OBJC_MODULES);
} */
static void
build_module_initializer_routine (void)
{
tree body;
#ifdef OBJCPLUS
push_lang_context (lang_name_c); /* extern "C" */
#endif
objc_push_parm (build_decl (PARM_DECL, NULL_TREE, void_type_node));
objc_start_function (get_identifier (TAG_GNUINIT),
build_function_type (void_type_node,
OBJC_VOID_AT_END),
NULL_TREE, objc_get_parm_info (0));
body = c_begin_compound_stmt (true);
add_stmt (build_function_call
(execclass_decl,
build_tree_list
(NULL_TREE,
build_unary_op (input_location, ADDR_EXPR,
UOBJC_MODULES_decl, 0))));
add_stmt (c_end_compound_stmt (body, true));
TREE_PUBLIC (current_function_decl) = 0;
#ifndef OBJCPLUS
/* For Objective-C++, we will need to call __objc_gnu_init
from objc_generate_static_init_call() below. */
DECL_STATIC_CONSTRUCTOR (current_function_decl) = 1;
#endif
GNU_INIT_decl = current_function_decl;
finish_function ();
#ifdef OBJCPLUS
pop_lang_context ();
#endif
}
#ifdef OBJCPLUS
/* Return 1 if the __objc_gnu_init function has been synthesized and needs
to be called by the module initializer routine. */
int
objc_static_init_needed_p (void)
{
return (GNU_INIT_decl != NULL_TREE);
}
/* Generate a call to the __objc_gnu_init initializer function. */
tree
objc_generate_static_init_call (tree ctors ATTRIBUTE_UNUSED)
{
add_stmt (build_stmt (EXPR_STMT,
build_function_call (GNU_INIT_decl, NULL_TREE)));
return ctors;
}
#endif /* OBJCPLUS */
/* Return the DECL of the string IDENT in the SECTION. */
static tree
get_objc_string_decl (tree ident, enum string_section section)
{
tree chain;
if (section == class_names)
chain = class_names_chain;
else if (section == meth_var_names)
chain = meth_var_names_chain;
else if (section == meth_var_types)
chain = meth_var_types_chain;
else
abort ();
for (; chain != 0; chain = TREE_CHAIN (chain))
if (TREE_VALUE (chain) == ident)
return (TREE_PURPOSE (chain));
abort ();
return NULL_TREE;
}
/* Output references to all statically allocated objects. Return the DECL
for the array built. */
static void
generate_static_references (void)
{
tree decls = NULL_TREE, expr = NULL_TREE;
tree class_name, klass, decl, initlist;
tree cl_chain, in_chain, type
= build_array_type (build_pointer_type (void_type_node), NULL_TREE);
int num_inst, num_class;
char buf[256];
if (flag_next_runtime)
abort ();
for (cl_chain = objc_static_instances, num_class = 0;
cl_chain; cl_chain = TREE_CHAIN (cl_chain), num_class++)
{
for (num_inst = 0, in_chain = TREE_PURPOSE (cl_chain);
in_chain; num_inst++, in_chain = TREE_CHAIN (in_chain));
sprintf (buf, "_OBJC_STATIC_INSTANCES_%d", num_class);
decl = start_var_decl (type, buf);
/* Output {class_name, ...}. */
klass = TREE_VALUE (cl_chain);
class_name = get_objc_string_decl (OBJC_TYPE_NAME (klass), class_names);
initlist = build_tree_list (NULL_TREE,
build_unary_op (input_location,
ADDR_EXPR, class_name, 1));
/* Output {..., instance, ...}. */
for (in_chain = TREE_PURPOSE (cl_chain);
in_chain; in_chain = TREE_CHAIN (in_chain))
{
expr = build_unary_op (input_location,
ADDR_EXPR, TREE_VALUE (in_chain), 1);
initlist = tree_cons (NULL_TREE, expr, initlist);
}
/* Output {..., NULL}. */
initlist = tree_cons (NULL_TREE, build_int_cst (NULL_TREE, 0), initlist);
expr = objc_build_constructor (TREE_TYPE (decl), nreverse (initlist));
finish_var_decl (decl, expr);
decls
= tree_cons (NULL_TREE, build_unary_op (input_location,
ADDR_EXPR, decl, 1), decls);
}
decls = tree_cons (NULL_TREE, build_int_cst (NULL_TREE, 0), decls);
expr = objc_build_constructor (type, nreverse (decls));
static_instances_decl = start_var_decl (type, "_OBJC_STATIC_INSTANCES");
finish_var_decl (static_instances_decl, expr);
}
static GTY(()) int selector_reference_idx;
static tree
build_selector_reference_decl (void)
{
tree decl;
char buf[256];
sprintf (buf, "_OBJC_SELECTOR_REFERENCES_%d", selector_reference_idx++);
decl = start_var_decl (objc_selector_type, buf);
return decl;
}
static void
build_selector_table_decl (void)
{
tree temp;
if (flag_typed_selectors)
{
build_selector_template ();
temp = build_array_type (objc_selector_template, NULL_TREE);
}
else
temp = build_array_type (objc_selector_type, NULL_TREE);
UOBJC_SELECTOR_TABLE_decl = start_var_decl (temp, "_OBJC_SELECTOR_TABLE");
}
/* Just a handy wrapper for add_objc_string. */
static tree
build_selector (tree ident)
{
return convert (objc_selector_type,
add_objc_string (ident, meth_var_names));
}
static void
build_selector_translation_table (void)
{
tree chain, initlist = NULL_TREE;
int offset = 0;
tree decl = NULL_TREE;
for (chain = sel_ref_chain; chain; chain = TREE_CHAIN (chain))
{
tree expr;
if (warn_selector && objc_implementation_context)
{
tree method_chain;
bool found = false;
for (method_chain = meth_var_names_chain;
method_chain;
method_chain = TREE_CHAIN (method_chain))
{
if (TREE_VALUE (method_chain) == TREE_VALUE (chain))
{
found = true;
break;
}
}
if (!found)
{
location_t *loc;
if (flag_next_runtime && TREE_PURPOSE (chain))
loc = &DECL_SOURCE_LOCATION (TREE_PURPOSE (chain));
else
loc = &input_location;
warning (0, "%Hcreating selector for nonexistent method %qE",
loc, TREE_VALUE (chain));
}
}
expr = build_selector (TREE_VALUE (chain));
/* add one for the '\0' character */
offset += IDENTIFIER_LENGTH (TREE_VALUE (chain)) + 1;
if (flag_next_runtime)
{
decl = TREE_PURPOSE (chain);
finish_var_decl (decl, expr);
}
else
{
if (flag_typed_selectors)
{
tree eltlist = NULL_TREE;
tree encoding = get_proto_encoding (TREE_PURPOSE (chain));
eltlist = tree_cons (NULL_TREE, expr, NULL_TREE);
eltlist = tree_cons (NULL_TREE, encoding, eltlist);
expr = objc_build_constructor (objc_selector_template,
nreverse (eltlist));
}
initlist = tree_cons (NULL_TREE, expr, initlist);
}
}
if (! flag_next_runtime)
{
/* Cause the selector table (previously forward-declared)
to be actually output. */
initlist = tree_cons (NULL_TREE,
flag_typed_selectors
? objc_build_constructor
(objc_selector_template,
tree_cons (NULL_TREE,
build_int_cst (NULL_TREE, 0),
tree_cons (NULL_TREE,
build_int_cst (NULL_TREE, 0),
NULL_TREE)))
: build_int_cst (NULL_TREE, 0), initlist);
initlist = objc_build_constructor (TREE_TYPE (UOBJC_SELECTOR_TABLE_decl),
nreverse (initlist));
finish_var_decl (UOBJC_SELECTOR_TABLE_decl, initlist);
}
}
static tree
get_proto_encoding (tree proto)
{
tree encoding;
if (proto)
{
if (! METHOD_ENCODING (proto))
{
encoding = encode_method_prototype (proto);
METHOD_ENCODING (proto) = encoding;
}
else
encoding = METHOD_ENCODING (proto);
return add_objc_string (encoding, meth_var_types);
}
else
return build_int_cst (NULL_TREE, 0);
}
/* sel_ref_chain is a list whose "value" fields will be instances of
identifier_node that represent the selector. */
static tree
build_typed_selector_reference (tree ident, tree prototype)
{
tree *chain = &sel_ref_chain;
tree expr;
int index = 0;
while (*chain)
{
if (TREE_PURPOSE (*chain) == prototype && TREE_VALUE (*chain) == ident)
goto return_at_index;
index++;
chain = &TREE_CHAIN (*chain);
}
*chain = tree_cons (prototype, ident, NULL_TREE);
return_at_index:
expr = build_unary_op (input_location, ADDR_EXPR,
build_array_ref (UOBJC_SELECTOR_TABLE_decl,
build_int_cst (NULL_TREE, index),
input_location),
1);
return convert (objc_selector_type, expr);
}
static tree
build_selector_reference (tree ident)
{
tree *chain = &sel_ref_chain;
tree expr;
int index = 0;
while (*chain)
{
if (TREE_VALUE (*chain) == ident)
return (flag_next_runtime
? TREE_PURPOSE (*chain)
: build_array_ref (UOBJC_SELECTOR_TABLE_decl,
build_int_cst (NULL_TREE, index),
input_location));
index++;
chain = &TREE_CHAIN (*chain);
}
expr = (flag_next_runtime ? build_selector_reference_decl (): NULL_TREE);
*chain = tree_cons (expr, ident, NULL_TREE);
return (flag_next_runtime
? expr
: build_array_ref (UOBJC_SELECTOR_TABLE_decl,
build_int_cst (NULL_TREE, index),
input_location));
}
static GTY(()) int class_reference_idx;
static tree
build_class_reference_decl (void)
{
tree decl;
char buf[256];
sprintf (buf, "_OBJC_CLASS_REFERENCES_%d", class_reference_idx++);
decl = start_var_decl (objc_class_type, buf);
return decl;
}
/* Create a class reference, but don't create a variable to reference
it. */
static void
add_class_reference (tree ident)
{
tree chain;
if ((chain = cls_ref_chain))
{
tree tail;
do
{
if (ident == TREE_VALUE (chain))
return;
tail = chain;
chain = TREE_CHAIN (chain);
}
while (chain);
/* Append to the end of the list */
TREE_CHAIN (tail) = tree_cons (NULL_TREE, ident, NULL_TREE);
}
else
cls_ref_chain = tree_cons (NULL_TREE, ident, NULL_TREE);
}
/* Get a class reference, creating it if necessary. Also create the
reference variable. */
tree
objc_get_class_reference (tree ident)
{
tree orig_ident = (DECL_P (ident)
? DECL_NAME (ident)
: TYPE_P (ident)
? OBJC_TYPE_NAME (ident)
: ident);
bool local_scope = false;
#ifdef OBJCPLUS
if (processing_template_decl)
/* Must wait until template instantiation time. */
return build_min_nt (CLASS_REFERENCE_EXPR, ident);
#endif
if (TREE_CODE (ident) == TYPE_DECL)
ident = (DECL_ORIGINAL_TYPE (ident)
? DECL_ORIGINAL_TYPE (ident)
: TREE_TYPE (ident));
#ifdef OBJCPLUS
if (TYPE_P (ident) && TYPE_CONTEXT (ident)
&& TYPE_CONTEXT (ident) != global_namespace)
local_scope = true;
#endif
if (local_scope || !(ident = objc_is_class_name (ident)))
{
error ("%qs is not an Objective-C class name or alias",
IDENTIFIER_POINTER (orig_ident));
return error_mark_node;
}
if (flag_next_runtime && !flag_zero_link)
{
tree *chain;
tree decl;
for (chain = &cls_ref_chain; *chain; chain = &TREE_CHAIN (*chain))
if (TREE_VALUE (*chain) == ident)
{
if (! TREE_PURPOSE (*chain))
TREE_PURPOSE (*chain) = build_class_reference_decl ();
return TREE_PURPOSE (*chain);
}
decl = build_class_reference_decl ();
*chain = tree_cons (decl, ident, NULL_TREE);
return decl;
}
else
{
tree params;
add_class_reference (ident);
params = build_tree_list (NULL_TREE,
my_build_string_pointer
(IDENTIFIER_LENGTH (ident) + 1,
IDENTIFIER_POINTER (ident)));
assemble_external (objc_get_class_decl);
return build_function_call (objc_get_class_decl, params);
}
}
/* For each string section we have a chain which maps identifier nodes
to decls for the strings. */
static tree
add_objc_string (tree ident, enum string_section section)
{
tree *chain, decl, type, string_expr;
if (section == class_names)
chain = &class_names_chain;
else if (section == meth_var_names)
chain = &meth_var_names_chain;
else if (section == meth_var_types)
chain = &meth_var_types_chain;
else
abort ();
while (*chain)
{
if (TREE_VALUE (*chain) == ident)
return convert (string_type_node,
build_unary_op (input_location,
ADDR_EXPR, TREE_PURPOSE (*chain), 1));
chain = &TREE_CHAIN (*chain);
}
decl = build_objc_string_decl (section);
type = build_array_type
(char_type_node,
build_index_type
(build_int_cst (NULL_TREE,
IDENTIFIER_LENGTH (ident))));
decl = start_var_decl (type, IDENTIFIER_POINTER (DECL_NAME (decl)));
string_expr = my_build_string (IDENTIFIER_LENGTH (ident) + 1,
IDENTIFIER_POINTER (ident));
finish_var_decl (decl, string_expr);
*chain = tree_cons (decl, ident, NULL_TREE);
return convert (string_type_node, build_unary_op (input_location,
ADDR_EXPR, decl, 1));
}
static GTY(()) int class_names_idx;
static GTY(()) int meth_var_names_idx;
static GTY(()) int meth_var_types_idx;
static tree
build_objc_string_decl (enum string_section section)
{
tree decl, ident;
char buf[256];
if (section == class_names)
sprintf (buf, "_OBJC_CLASS_NAME_%d", class_names_idx++);
else if (section == meth_var_names)
sprintf (buf, "_OBJC_METH_VAR_NAME_%d", meth_var_names_idx++);
else if (section == meth_var_types)
sprintf (buf, "_OBJC_METH_VAR_TYPE_%d", meth_var_types_idx++);
ident = get_identifier (buf);
decl = build_decl (VAR_DECL, ident, build_array_type (char_type_node, 0));
DECL_EXTERNAL (decl) = 1;
TREE_PUBLIC (decl) = 0;
TREE_USED (decl) = 1;
TREE_CONSTANT (decl) = 1;
DECL_CONTEXT (decl) = 0;
DECL_ARTIFICIAL (decl) = 1;
#ifdef OBJCPLUS
DECL_THIS_STATIC (decl) = 1; /* squash redeclaration errors */
#endif
make_decl_rtl (decl);
pushdecl_top_level (decl);
return decl;
}
void
objc_declare_alias (tree alias_ident, tree class_ident)
{
tree underlying_class;
#ifdef OBJCPLUS
if (current_namespace != global_namespace) {
error ("Objective-C declarations may only appear in global scope");
}
#endif /* OBJCPLUS */
if (!(underlying_class = objc_is_class_name (class_ident)))
warning (0, "cannot find class %qs", IDENTIFIER_POINTER (class_ident));
else if (objc_is_class_name (alias_ident))
warning (0, "class %qs already exists", IDENTIFIER_POINTER (alias_ident));
else
{
/* Implement @compatibility_alias as a typedef. */
#ifdef OBJCPLUS
push_lang_context (lang_name_c); /* extern "C" */
#endif
lang_hooks.decls.pushdecl (build_decl
(TYPE_DECL,
alias_ident,
xref_tag (RECORD_TYPE, underlying_class)));
#ifdef OBJCPLUS
pop_lang_context ();
#endif
alias_chain = tree_cons (underlying_class, alias_ident, alias_chain);
}
}
void
objc_declare_class (tree ident_list)
{
tree list;
#ifdef OBJCPLUS
if (current_namespace != global_namespace) {
error ("Objective-C declarations may only appear in global scope");
}
#endif /* OBJCPLUS */
for (list = ident_list; list; list = TREE_CHAIN (list))
{
tree ident = TREE_VALUE (list);
if (! objc_is_class_name (ident))
{
tree record = lookup_name (ident), type = record;
if (record)
{
if (TREE_CODE (record) == TYPE_DECL)
type = DECL_ORIGINAL_TYPE (record);
if (!TYPE_HAS_OBJC_INFO (type)
|| !TYPE_OBJC_INTERFACE (type))
{
error ("%qs redeclared as different kind of symbol",
IDENTIFIER_POINTER (ident));
error ("previous declaration of %q+D",
record);
}
}
record = xref_tag (RECORD_TYPE, ident);
INIT_TYPE_OBJC_INFO (record);
TYPE_OBJC_INTERFACE (record) = ident;
class_chain = tree_cons (NULL_TREE, ident, class_chain);
}
}
}
tree
objc_is_class_name (tree ident)
{
tree chain;
if (ident && TREE_CODE (ident) == IDENTIFIER_NODE
&& identifier_global_value (ident))
ident = identifier_global_value (ident);
while (ident && TREE_CODE (ident) == TYPE_DECL && DECL_ORIGINAL_TYPE (ident))
ident = OBJC_TYPE_NAME (DECL_ORIGINAL_TYPE (ident));
if (ident && TREE_CODE (ident) == RECORD_TYPE)
ident = OBJC_TYPE_NAME (ident);
#ifdef OBJCPLUS
if (ident && TREE_CODE (ident) == TYPE_DECL)
ident = DECL_NAME (ident);
#endif
if (!ident || TREE_CODE (ident) != IDENTIFIER_NODE)
return NULL_TREE;
if (lookup_interface (ident))
return ident;
for (chain = class_chain; chain; chain = TREE_CHAIN (chain))
{
if (ident == TREE_VALUE (chain))
return ident;
}
for (chain = alias_chain; chain; chain = TREE_CHAIN (chain))
{
if (ident == TREE_VALUE (chain))
return TREE_PURPOSE (chain);
}
return 0;
}
/* Check whether TYPE is either 'id' or 'Class'. */
tree
objc_is_id (tree type)
{
if (type && TREE_CODE (type) == IDENTIFIER_NODE
&& identifier_global_value (type))
type = identifier_global_value (type);
if (type && TREE_CODE (type) == TYPE_DECL)
type = TREE_TYPE (type);
/* NB: This function may be called before the ObjC front-end has
been initialized, in which case OBJC_OBJECT_TYPE will (still) be NULL. */
return (objc_object_type && type
&& (IS_ID (type) || IS_CLASS (type) || IS_SUPER (type))
? type
: NULL_TREE);
}
/* Check whether TYPE is either 'id', 'Class', or a pointer to an ObjC
class instance. This is needed by other parts of the compiler to
handle ObjC types gracefully. */
tree
objc_is_object_ptr (tree type)
{
tree ret;
type = TYPE_MAIN_VARIANT (type);
if (!POINTER_TYPE_P (type))
return 0;
ret = objc_is_id (type);
if (!ret)
ret = objc_is_class_name (TREE_TYPE (type));
return ret;
}
static int
objc_is_gcable_type (tree type, int or_strong_p)
{
tree name;
if (!TYPE_P (type))
return 0;
if (objc_is_id (TYPE_MAIN_VARIANT (type)))
return 1;
if (or_strong_p && lookup_attribute ("objc_gc", TYPE_ATTRIBUTES (type)))
return 1;
if (TREE_CODE (type) != POINTER_TYPE && TREE_CODE (type) != INDIRECT_REF)
return 0;
type = TREE_TYPE (type);
if (TREE_CODE (type) != RECORD_TYPE)
return 0;
name = TYPE_NAME (type);
return (objc_is_class_name (name) != NULL_TREE);
}
static tree
objc_substitute_decl (tree expr, tree oldexpr, tree newexpr)
{
if (expr == oldexpr)
return newexpr;
switch (TREE_CODE (expr))
{
case COMPONENT_REF:
return objc_build_component_ref
(objc_substitute_decl (TREE_OPERAND (expr, 0),
oldexpr,
newexpr),
DECL_NAME (TREE_OPERAND (expr, 1)));
case ARRAY_REF:
return build_array_ref (objc_substitute_decl (TREE_OPERAND (expr, 0),
oldexpr,
newexpr),
TREE_OPERAND (expr, 1),
input_location);
case INDIRECT_REF:
return build_indirect_ref (input_location,
objc_substitute_decl (TREE_OPERAND (expr, 0),
oldexpr,
newexpr), "->");
default:
return expr;
}
}
static tree
objc_build_ivar_assignment (tree outervar, tree lhs, tree rhs)
{
tree func_params;
/* The LHS parameter contains the expression 'outervar->memberspec';
we need to transform it into '&((typeof(outervar) *) 0)->memberspec',
where memberspec may be arbitrarily complex (e.g., 'g->f.d[2].g[3]').
*/
tree offs
= objc_substitute_decl
(lhs, outervar, convert (TREE_TYPE (outervar), integer_zero_node));
tree func
= (flag_objc_direct_dispatch
? objc_assign_ivar_fast_decl
: objc_assign_ivar_decl);
offs = convert (integer_type_node, build_unary_op (input_location,
ADDR_EXPR, offs, 0));
offs = fold (offs);
func_params = tree_cons (NULL_TREE,
convert (objc_object_type, rhs),
tree_cons (NULL_TREE, convert (objc_object_type, outervar),
tree_cons (NULL_TREE, offs,
NULL_TREE)));
assemble_external (func);
return build_function_call (func, func_params);
}
static tree
objc_build_global_assignment (tree lhs, tree rhs)
{
tree func_params = tree_cons (NULL_TREE,
convert (objc_object_type, rhs),
tree_cons (NULL_TREE, convert (build_pointer_type (objc_object_type),
build_unary_op (input_location, ADDR_EXPR, lhs, 0)),
NULL_TREE));
assemble_external (objc_assign_global_decl);
return build_function_call (objc_assign_global_decl, func_params);
}
static tree
objc_build_strong_cast_assignment (tree lhs, tree rhs)
{
tree func_params = tree_cons (NULL_TREE,
convert (objc_object_type, rhs),
tree_cons (NULL_TREE, convert (build_pointer_type (objc_object_type),
build_unary_op (input_location, ADDR_EXPR, lhs, 0)),
NULL_TREE));
assemble_external (objc_assign_strong_cast_decl);
return build_function_call (objc_assign_strong_cast_decl, func_params);
}
static int
objc_is_gcable_p (tree expr)
{
return (TREE_CODE (expr) == COMPONENT_REF
? objc_is_gcable_p (TREE_OPERAND (expr, 1))
: TREE_CODE (expr) == ARRAY_REF
? (objc_is_gcable_p (TREE_TYPE (expr))
|| objc_is_gcable_p (TREE_OPERAND (expr, 0)))
: TREE_CODE (expr) == ARRAY_TYPE
? objc_is_gcable_p (TREE_TYPE (expr))
: TYPE_P (expr)
? objc_is_gcable_type (expr, 1)
: (objc_is_gcable_p (TREE_TYPE (expr))
|| (DECL_P (expr)
&& lookup_attribute ("objc_gc", DECL_ATTRIBUTES (expr)))));
}
static int
objc_is_ivar_reference_p (tree expr)
{
return (TREE_CODE (expr) == ARRAY_REF
? objc_is_ivar_reference_p (TREE_OPERAND (expr, 0))
: TREE_CODE (expr) == COMPONENT_REF
? TREE_CODE (TREE_OPERAND (expr, 1)) == FIELD_DECL
: 0);
}
static int
objc_is_global_reference_p (tree expr)
{
return (TREE_CODE (expr) == INDIRECT_REF || TREE_CODE (expr) == PLUS_EXPR
? objc_is_global_reference_p (TREE_OPERAND (expr, 0))
: DECL_P (expr)
? (!DECL_CONTEXT (expr) || TREE_STATIC (expr))
: 0);
}
tree
objc_generate_write_barrier (tree lhs, enum tree_code modifycode, tree rhs)
{
tree result = NULL_TREE, outer;
int strong_cast_p = 0, outer_gc_p = 0, indirect_p = 0;
/* See if we have any lhs casts, and strip them out. NB: The lvalue casts
will have been transformed to the form '*(type *)&expr'. */
if (TREE_CODE (lhs) == INDIRECT_REF)
{
outer = TREE_OPERAND (lhs, 0);
while (!strong_cast_p
&& (CONVERT_EXPR_P (outer)
|| TREE_CODE (outer) == NON_LVALUE_EXPR))
{
tree lhstype = TREE_TYPE (outer);
/* Descend down the cast chain, and record the first objc_gc
attribute found. */
if (POINTER_TYPE_P (lhstype))
{
tree attr
= lookup_attribute ("objc_gc",
TYPE_ATTRIBUTES (TREE_TYPE (lhstype)));
if (attr)
strong_cast_p = 1;
}
outer = TREE_OPERAND (outer, 0);
}
}
/* If we have a __strong cast, it trumps all else. */
if (strong_cast_p)
{
if (modifycode != NOP_EXPR)
goto invalid_pointer_arithmetic;
if (warn_assign_intercept)
warning (0, "strong-cast assignment has been intercepted");
result = objc_build_strong_cast_assignment (lhs, rhs);
goto exit_point;
}
/* the lhs must be of a suitable type, regardless of its underlying
structure. */
if (!objc_is_gcable_p (lhs))
goto exit_point;
outer = lhs;
while (outer
&& (TREE_CODE (outer) == COMPONENT_REF
|| TREE_CODE (outer) == ARRAY_REF))
outer = TREE_OPERAND (outer, 0);
if (TREE_CODE (outer) == INDIRECT_REF)
{
outer = TREE_OPERAND (outer, 0);
indirect_p = 1;
}
outer_gc_p = objc_is_gcable_p (outer);
/* Handle ivar assignments. */
if (objc_is_ivar_reference_p (lhs))
{
/* if the struct to the left of the ivar is not an Objective-C object (__strong
doesn't cut it here), the best we can do here is suggest a cast. */
if (!objc_is_gcable_type (TREE_TYPE (outer), 0))
{
/* We may still be able to use the global write barrier... */
if (!indirect_p && objc_is_global_reference_p (outer))
goto global_reference;
suggest_cast:
if (modifycode == NOP_EXPR)
{
if (warn_assign_intercept)
warning (0, "strong-cast may possibly be needed");
}
goto exit_point;
}
if (modifycode != NOP_EXPR)
goto invalid_pointer_arithmetic;
if (warn_assign_intercept)
warning (0, "instance variable assignment has been intercepted");
result = objc_build_ivar_assignment (outer, lhs, rhs);
goto exit_point;
}
/* Likewise, intercept assignment to global/static variables if their type is
GC-marked. */
if (objc_is_global_reference_p (outer))
{
if (indirect_p)
goto suggest_cast;
global_reference:
if (modifycode != NOP_EXPR)
{
invalid_pointer_arithmetic:
if (outer_gc_p)
warning (0, "pointer arithmetic for garbage-collected objects not allowed");
goto exit_point;
}
if (warn_assign_intercept)
warning (0, "global/static variable assignment has been intercepted");
result = objc_build_global_assignment (lhs, rhs);
}
/* In all other cases, fall back to the normal mechanism. */
exit_point:
return result;
}
struct interface_tuple GTY(())
{
tree id;
tree class_name;
};
static GTY ((param_is (struct interface_tuple))) htab_t interface_htab;
static hashval_t
hash_interface (const void *p)
{
const struct interface_tuple *d = (const struct interface_tuple *) p;
return IDENTIFIER_HASH_VALUE (d->id);
}
static int
eq_interface (const void *p1, const void *p2)
{
const struct interface_tuple *d = (const struct interface_tuple *) p1;
return d->id == p2;
}
static tree
lookup_interface (tree ident)
{
#ifdef OBJCPLUS
if (ident && TREE_CODE (ident) == TYPE_DECL)
ident = DECL_NAME (ident);
#endif
if (ident == NULL_TREE || TREE_CODE (ident) != IDENTIFIER_NODE)
return NULL_TREE;
{
struct interface_tuple **slot;
tree i = NULL_TREE;
if (interface_htab)
{
slot = (struct interface_tuple **)
htab_find_slot_with_hash (interface_htab, ident,
IDENTIFIER_HASH_VALUE (ident),
NO_INSERT);
if (slot && *slot)
i = (*slot)->class_name;