598 lines
20 KiB
C++
598 lines
20 KiB
C++
/* GNU Objective-C Runtime API.
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Copyright (C) 1993, 1995, 1996, 1997 Free Software Foundation, Inc.
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2, or (at your option) any
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later version.
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GNU CC is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* As a special exception, if you link this library with files compiled
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with GCC to produce an executable, this does not cause the resulting
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executable to be covered by the GNU General Public License. This
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exception does not however invalidate any other reasons why the
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executable file might be covered by the GNU General Public License. */
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#ifndef __objc_api_INCLUDE_GNU
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#define __objc_api_INCLUDE_GNU
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#include "objc/objc.h"
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#include "objc/hash.h"
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#include "objc/thr.h"
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#include <stdio.h>
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#include <stdarg.h>
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/* For functions which return Method_t */
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#define METHOD_NULL (Method_t)0
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/* Boolean typedefs */
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/*
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** Method descriptor returned by introspective Object methods.
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** This is really just the first part of the more complete objc_method
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** structure defined below and used internally by the runtime.
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*/
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struct objc_method_description
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{
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SEL name; /* this is a selector, not a string */
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char *types; /* type encoding */
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};
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/* Filer types used to describe Ivars and Methods. */
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#define _C_ID '@'
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#define _C_CLASS '#'
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#define _C_SEL ':'
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#define _C_CHR 'c'
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#define _C_UCHR 'C'
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#define _C_SHT 's'
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#define _C_USHT 'S'
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#define _C_INT 'i'
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#define _C_UINT 'I'
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#define _C_LNG 'l'
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#define _C_ULNG 'L'
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#define _C_LNG_LNG 'q'
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#define _C_ULNG_LNG 'Q'
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#define _C_FLT 'f'
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#define _C_DBL 'd'
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#define _C_BFLD 'b'
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#define _C_VOID 'v'
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#define _C_UNDEF '?'
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#define _C_PTR '^'
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#define _C_CHARPTR '*'
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#define _C_ATOM '%'
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#define _C_ARY_B '['
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#define _C_ARY_E ']'
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#define _C_UNION_B '('
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#define _C_UNION_E ')'
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#define _C_STRUCT_B '{'
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#define _C_STRUCT_E '}'
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/*
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** Error handling
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**
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** Call objc_error() or objc_verror() to record an error; this error
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** routine will generally exit the program but not necessarily if the
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** user has installed his own error handler.
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**
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** Call objc_set_error_handler to assign your own function for
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** handling errors. The function should return YES if it is ok
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** to continue execution, or return NO or just abort if the
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** program should be stopped. The default error handler is just to
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** print a message on stderr.
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**
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** The error handler function should be of type objc_error_handler
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** The first parameter is an object instance of relevance.
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** The second parameter is an error code.
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** The third parameter is a format string in the printf style.
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** The fourth parameter is a variable list of arguments.
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*/
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extern void objc_error(id object, int code, const char* fmt, ...);
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extern void objc_verror(id object, int code, const char* fmt, va_list ap);
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typedef BOOL (*objc_error_handler)(id, int code, const char *fmt, va_list ap);
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objc_error_handler objc_set_error_handler(objc_error_handler func);
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/*
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** Error codes
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** These are used by the runtime library, and your
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** error handling may use them to determine if the error is
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** hard or soft thus whether execution can continue or abort.
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*/
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#define OBJC_ERR_UNKNOWN 0 /* Generic error */
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#define OBJC_ERR_OBJC_VERSION 1 /* Incorrect runtime version */
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#define OBJC_ERR_GCC_VERSION 2 /* Incorrect compiler version */
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#define OBJC_ERR_MODULE_SIZE 3 /* Bad module size */
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#define OBJC_ERR_PROTOCOL_VERSION 4 /* Incorrect protocol version */
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#define OBJC_ERR_MEMORY 10 /* Out of memory */
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#define OBJC_ERR_RECURSE_ROOT 20 /* Attempt to archive the root
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object more than once. */
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#define OBJC_ERR_BAD_DATA 21 /* Didn't read expected data */
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#define OBJC_ERR_BAD_KEY 22 /* Bad key for object */
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#define OBJC_ERR_BAD_CLASS 23 /* Unknown class */
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#define OBJC_ERR_BAD_TYPE 24 /* Bad type specification */
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#define OBJC_ERR_NO_READ 25 /* Cannot read stream */
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#define OBJC_ERR_NO_WRITE 26 /* Cannot write stream */
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#define OBJC_ERR_STREAM_VERSION 27 /* Incorrect stream version */
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#define OBJC_ERR_BAD_OPCODE 28 /* Bad opcode */
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#define OBJC_ERR_UNIMPLEMENTED 30 /* Method is not implemented */
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#define OBJC_ERR_BAD_STATE 40 /* Bad thread state */
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/*
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** Set this variable nonzero to print a line describing each
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** message that is sent. (this is currently disabled)
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*/
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extern BOOL objc_trace;
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/* For every class which happens to have statically allocated instances in
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this module, one OBJC_STATIC_INSTANCES is allocated by the compiler.
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INSTANCES is NULL terminated and points to all statically allocated
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instances of this class. */
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struct objc_static_instances
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{
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char *class_name;
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id instances[0];
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};
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/*
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** Whereas a Module (defined further down) is the root (typically) of a file,
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** a Symtab is the root of the class and category definitions within the
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** module.
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**
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** A Symtab contains a variable length array of pointers to classes and
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** categories defined in the module.
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*/
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typedef struct objc_symtab {
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unsigned long sel_ref_cnt; /* Unknown. */
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SEL refs; /* Unknown. */
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unsigned short cls_def_cnt; /* Number of classes compiled
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(defined) in the module. */
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unsigned short cat_def_cnt; /* Number of categories
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compiled (defined) in the
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module. */
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void *defs[1]; /* Variable array of pointers.
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cls_def_cnt of type Class
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followed by cat_def_cnt of
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type Category_t, followed
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by a NULL terminated array
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of objc_static_instances. */
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} Symtab, *Symtab_t;
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/*
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** The compiler generates one of these structures for each module that
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** composes the executable (eg main.m).
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**
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** This data structure is the root of the definition tree for the module.
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**
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** A collect program runs between ld stages and creates a ObjC ctor array.
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** That array holds a pointer to each module structure of the executable.
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*/
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typedef struct objc_module {
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unsigned long version; /* Compiler revision. */
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unsigned long size; /* sizeof(Module). */
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const char* name; /* Name of the file where the
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module was generated. The
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name includes the path. */
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Symtab_t symtab; /* Pointer to the Symtab of
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the module. The Symtab
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holds an array of
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pointers to
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the classes and categories
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defined in the module. */
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} Module, *Module_t;
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/*
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** The compiler generates one of these structures for a class that has
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** instance variables defined in its specification.
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*/
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typedef struct objc_ivar* Ivar_t;
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typedef struct objc_ivar_list {
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int ivar_count; /* Number of structures (Ivar)
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contained in the list. One
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structure per instance
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variable defined in the
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class. */
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struct objc_ivar {
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const char* ivar_name; /* Name of the instance
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variable as entered in the
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class definition. */
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const char* ivar_type; /* Description of the Ivar's
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type. Useful for
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debuggers. */
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int ivar_offset; /* Byte offset from the base
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address of the instance
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structure to the variable. */
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} ivar_list[1]; /* Variable length
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structure. */
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} IvarList, *IvarList_t;
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/*
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** The compiler generates one (or more) of these structures for a class that
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** has methods defined in its specification.
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**
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** The implementation of a class can be broken into separate pieces in a file
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** and categories can break them across modules. To handle this problem is a
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** singly linked list of methods.
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*/
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typedef struct objc_method Method;
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typedef Method* Method_t;
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typedef struct objc_method_list {
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struct objc_method_list* method_next; /* This variable is used to link
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a method list to another. It
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is a singly linked list. */
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int method_count; /* Number of methods defined in
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this structure. */
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struct objc_method {
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SEL method_name; /* This variable is the method's
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name. It is a char*.
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The unique integer passed to
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objc_msg_send is a char* too.
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It is compared against
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method_name using strcmp. */
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const char* method_types; /* Description of the method's
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parameter list. Useful for
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debuggers. */
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IMP method_imp; /* Address of the method in the
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executable. */
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} method_list[1]; /* Variable length
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structure. */
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} MethodList, *MethodList_t;
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struct objc_protocol_list {
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struct objc_protocol_list *next;
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int count;
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Protocol *list[1];
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};
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/*
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** This is used to assure consistent access to the info field of
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** classes
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*/
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#ifndef HOST_BITS_PER_LONG
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#define HOST_BITS_PER_LONG (sizeof(long)*8)
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#endif
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#define __CLS_INFO(cls) ((cls)->info)
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#define __CLS_ISINFO(cls, mask) ((__CLS_INFO(cls)&mask)==mask)
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#define __CLS_SETINFO(cls, mask) (__CLS_INFO(cls) |= mask)
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/* The structure is of type MetaClass */
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#define _CLS_META 0x2L
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#define CLS_ISMETA(cls) ((cls)&&__CLS_ISINFO(cls, _CLS_META))
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/* The structure is of type Class */
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#define _CLS_CLASS 0x1L
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#define CLS_ISCLASS(cls) ((cls)&&__CLS_ISINFO(cls, _CLS_CLASS))
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/*
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** The class is initialized within the runtime. This means that
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** it has had correct super and sublinks assigned
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*/
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#define _CLS_RESOLV 0x8L
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#define CLS_ISRESOLV(cls) __CLS_ISINFO(cls, _CLS_RESOLV)
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#define CLS_SETRESOLV(cls) __CLS_SETINFO(cls, _CLS_RESOLV)
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/*
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** The class has been send a +initialize message or a such is not
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** defined for this class
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*/
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#define _CLS_INITIALIZED 0x04L
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#define CLS_ISINITIALIZED(cls) __CLS_ISINFO(cls, _CLS_INITIALIZED)
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#define CLS_SETINITIALIZED(cls) __CLS_SETINFO(cls, _CLS_INITIALIZED)
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/*
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** The class number of this class. This must be the same for both the
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** class and its meta class object
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*/
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#define CLS_GETNUMBER(cls) (__CLS_INFO(cls) >> (HOST_BITS_PER_LONG/2))
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#define CLS_SETNUMBER(cls, num) \
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({ (cls)->info <<= (HOST_BITS_PER_LONG/2); \
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(cls)->info >>= (HOST_BITS_PER_LONG/2); \
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__CLS_SETINFO(cls, (((unsigned long)num) << (HOST_BITS_PER_LONG/2))); })
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/*
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** The compiler generates one of these structures for each category. A class
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** may have many categories and contain both instance and factory methods.
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*/
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typedef struct objc_category {
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const char* category_name; /* Name of the category. Name
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contained in the () of the
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category definition. */
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const char* class_name; /* Name of the class to which
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the category belongs. */
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MethodList_t instance_methods; /* Linked list of instance
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methods defined in the
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category. NULL indicates no
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instance methods defined. */
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MethodList_t class_methods; /* Linked list of factory
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methods defined in the
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category. NULL indicates no
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class methods defined. */
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struct objc_protocol_list *protocols; /* List of Protocols
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conformed to */
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} Category, *Category_t;
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/*
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** Structure used when a message is send to a class's super class. The
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** compiler generates one of these structures and passes it to
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** objc_msg_super.
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*/
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typedef struct objc_super {
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id self; /* Id of the object sending
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the message. */
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Class class; /* Object's super class. */
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} Super, *Super_t;
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IMP objc_msg_lookup_super(Super_t super, SEL sel);
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retval_t objc_msg_sendv(id, SEL, arglist_t);
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/*
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** This is a hook which is called by objc_lookup_class and
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** objc_get_class if the runtime is not able to find the class.
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** This may e.g. try to load in the class using dynamic loading.
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** The function is guaranteed to be passed a non-NULL name string.
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*/
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extern Class (*_objc_lookup_class)(const char *name);
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/*
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** This is a hook which is called by __objc_exec_class every time a class
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** or a category is loaded into the runtime. This may e.g. help a
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** dynamic loader determine the classes that have been loaded when
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** an object file is dynamically linked in.
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*/
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extern void (*_objc_load_callback)(Class class, Category* category);
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/*
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** Hook functions for allocating, copying and disposing of instances
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*/
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extern id (*_objc_object_alloc)(Class class);
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extern id (*_objc_object_copy)(id object);
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extern id (*_objc_object_dispose)(id object);
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/*
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** Standard functions for memory allocation and disposal.
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** Users should use these functions in their ObjC programs so
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** that they work properly with garbage collectors as well as
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** can take advantage of the exception/error handling available.
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*/
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void *
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objc_malloc(size_t size);
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void *
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objc_atomic_malloc(size_t size);
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void *
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objc_valloc(size_t size);
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void *
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objc_realloc(void *mem, size_t size);
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void *
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objc_calloc(size_t nelem, size_t size);
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void
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objc_free(void *mem);
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/*
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** Hook functions for memory allocation and disposal.
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** This makes it easy to substitute garbage collection systems
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** such as Boehm's GC by assigning these function pointers
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** to the GC's allocation routines. By default these point
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** to the ANSI standard malloc, realloc, free, etc.
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**
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** Users should call the normal objc routines above for
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** memory allocation and disposal within their programs.
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*/
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extern void *(*_objc_malloc)(size_t);
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extern void *(*_objc_atomic_malloc)(size_t);
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extern void *(*_objc_valloc)(size_t);
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extern void *(*_objc_realloc)(void *, size_t);
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extern void *(*_objc_calloc)(size_t, size_t);
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extern void (*_objc_free)(void *);
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Method_t class_get_class_method(MetaClass class, SEL aSel);
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Method_t class_get_instance_method(Class class, SEL aSel);
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Class class_pose_as(Class impostor, Class superclass);
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Class objc_get_class(const char *name);
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Class objc_lookup_class(const char *name);
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Class objc_next_class(void **enum_state);
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const char *sel_get_name(SEL selector);
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const char *sel_get_type(SEL selector);
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SEL sel_get_uid(const char *name);
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SEL sel_get_any_uid(const char *name);
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SEL sel_get_any_typed_uid(const char *name);
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SEL sel_get_typed_uid(const char *name, const char*);
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SEL sel_register_name(const char *name);
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SEL sel_register_typed_name(const char *name, const char*type);
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BOOL sel_is_mapped (SEL aSel);
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extern id class_create_instance(Class class);
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static inline const char *
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class_get_class_name(Class class)
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{
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return CLS_ISCLASS(class)?class->name:((class==Nil)?"Nil":0);
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}
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static inline long
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class_get_instance_size(Class class)
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{
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return CLS_ISCLASS(class)?class->instance_size:0;
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}
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static inline MetaClass
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class_get_meta_class(Class class)
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{
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return CLS_ISCLASS(class)?class->class_pointer:Nil;
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}
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static inline Class
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class_get_super_class(Class class)
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{
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return CLS_ISCLASS(class)?class->super_class:Nil;
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}
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static inline int
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class_get_version(Class class)
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{
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return CLS_ISCLASS(class)?class->version:-1;
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}
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static inline BOOL
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class_is_class(Class class)
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{
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return CLS_ISCLASS(class);
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}
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static inline BOOL
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class_is_meta_class(Class class)
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{
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return CLS_ISMETA(class);
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}
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static inline void
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class_set_version(Class class, long version)
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{
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if (CLS_ISCLASS(class))
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class->version = version;
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}
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static inline void *
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class_get_gc_object_type (Class class)
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{
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return CLS_ISCLASS(class) ? class->gc_object_type : NULL;
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}
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/* Mark the instance variable as innaccessible to the garbage collector */
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extern void class_ivar_set_gcinvisible (Class class,
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const char* ivarname,
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BOOL gcInvisible);
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static inline IMP
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method_get_imp(Method_t method)
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{
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return (method!=METHOD_NULL)?method->method_imp:(IMP)0;
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}
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IMP get_imp (Class class, SEL sel);
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/* Redefine on NeXTSTEP so as not to conflict with system function */
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#ifdef __NeXT__
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#define object_copy gnu_object_copy
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#define object_dispose gnu_object_dispose
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#endif
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id object_copy(id object);
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id object_dispose(id object);
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static inline Class
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object_get_class(id object)
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{
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return ((object!=nil)
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? (CLS_ISCLASS(object->class_pointer)
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? object->class_pointer
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: (CLS_ISMETA(object->class_pointer)
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? (Class)object
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: Nil))
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: Nil);
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}
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static inline const char *
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object_get_class_name(id object)
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|
{
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return ((object!=nil)?(CLS_ISCLASS(object->class_pointer)
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?object->class_pointer->name
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|
:((Class)object)->name)
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:"Nil");
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}
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static inline MetaClass
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object_get_meta_class(id object)
|
|
{
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return ((object!=nil)?(CLS_ISCLASS(object->class_pointer)
|
|
?object->class_pointer->class_pointer
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|
:(CLS_ISMETA(object->class_pointer)
|
|
?object->class_pointer
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:Nil))
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|
:Nil);
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}
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static inline Class
|
|
object_get_super_class
|
|
(id object)
|
|
{
|
|
return ((object!=nil)?(CLS_ISCLASS(object->class_pointer)
|
|
?object->class_pointer->super_class
|
|
:(CLS_ISMETA(object->class_pointer)
|
|
?((Class)object)->super_class
|
|
:Nil))
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|
:Nil);
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}
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static inline BOOL
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|
object_is_class(id object)
|
|
{
|
|
return CLS_ISCLASS((Class)object);
|
|
}
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static inline BOOL
|
|
object_is_instance(id object)
|
|
{
|
|
return (object!=nil)&&CLS_ISCLASS(object->class_pointer);
|
|
}
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static inline BOOL
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|
object_is_meta_class(id object)
|
|
{
|
|
return CLS_ISMETA((Class)object);
|
|
}
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|
|
struct sarray*
|
|
objc_get_uninstalled_dtable(void);
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|
|
#endif /* not __objc_api_INCLUDE_GNU */
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