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/*
m68k.h
Copyright (C) 1995, 1996 Ovidiu Predescu and Mircea Oancea.
All rights reserved.
Author: Ovidiu Predescu <ovidiu@bx.logicnet.ro>
This file is part of libFoundation.
Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted, provided
that the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation.
We disclaim all warranties with regard to this software, including all
implied warranties of merchantability and fitness, in no event shall
we be liable for any special, indirect or consequential damages or any
damages whatsoever resulting from loss of use, data or profits, whether in
an action of contract, negligence or other tortious action, arising out of
or in connection with the use or performance of this software.
*/
#ifndef __m68k_h__
#define __m68k_h__
#ifndef OBJC_FORWARDING_STACK_OFFSET
#define OBJC_FORWARDING_STACK_OFFSET 0
#endif
#ifndef OBJC_FORWARDING_MIN_OFFSET
#define OBJC_FORWARDING_MIN_OFFSET 0
#endif
/* Define the size of the block returned by __builtin_apply_args. This value is
computed by the function in expr.c. The block contains in order: a pointer
to the stack arguments frame, the structure value address unless this is
passed as an "invisible" first argument and all registers that may be used
in calling a function. */
#define APPLY_ARGS_SIZE 8
/* Define the size of the result block returned by the __builtin_apply. This
block contains all registers that could be used to return the function
value. This value is computed by apply_result_size function in expr.c. There
are also machines where this value is predefined in the machine description
file, so that machine specific information can be stored. */
#define APPLY_RESULT_SIZE 8
/* Define how to find the value returned by a function. TYPE is a Objective-C
encoding string describing the type of the returned value. ARGS is the
arguments frame passed to __builtin_apply. RESULT is the address of the
block returned by __builtin_apply. RETURN_VALUE is an address where this
macro should put the returned value. */
#define FUNCTION_VALUE(TYPE, ARGS, RESULT, RETURN_VALUE) \
({ int type_size = objc_sizeof_type(TYPE); \
if(*(TYPE) == _C_STRUCT_B || *(TYPE) == _C_UNION_B || *(TYPE) == _C_ARY_B) {\
if(type_size > 4 && type_size != 7 && type_size != 8) { \
/*void** p = *(void**)(((char*)(ARGS)) + sizeof(void*));*/ \
memcpy((RETURN_VALUE), \
*(void**)(((char*)(ARGS)) + sizeof(void*)), type_size); \
/*printf("result1 = %p %p\n", *p, *(p + 1)); */\
} \
else if(type_size <= sizeof(void*)) {\
memcpy((RETURN_VALUE), \
((char*)(RESULT)) + sizeof(void*) - type_size - (type_size % 2), type_size); \
/*printf("result2 = %p\n", *(char**)(RESULT));*/ \
} \
else { \
memcpy((RETURN_VALUE), (RESULT), type_size); \
/*printf("result3 = %p %p\n", *(char**)(RESULT), *((char**)(RESULT) + 1));*/ \
} \
} \
else if(type_size <= sizeof(void*)) {\
memcpy((RETURN_VALUE), \
((char*)(RESULT)) + sizeof(void*) - type_size, type_size); \
/*printf("result2 = %p\n", *(char**)(RESULT));*/ \
} \
else { \
memcpy((RETURN_VALUE), (RESULT), type_size); \
/*printf("result3 = %p %p\n", *(char**)(RESULT), *((char**)(RESULT) + 1));*/ \
} \
})
/* Set the value in RETURN_VALUE to be the value returned by a function.
Assume that the fucntion was previously called and RESULT_FRAME is the
address of the block returned by __builtin_apply. TYPE is the actual
type of this value. ARGS is the address of block that was passed
to __builtin_apply. */
#define FUNCTION_SET_VALUE(TYPE, ARGS, RESULT_FRAME, RETURN_VALUE) \
({ int type_size = objc_sizeof_type(TYPE); \
if(*(TYPE) == _C_STRUCT_B || *(TYPE) == _C_UNION_B || *(TYPE) == _C_ARY_B) {\
if(type_size > 4 && type_size != 7 && type_size != 8) \
memcpy(*(void**)(((char*)(ARGS)) + sizeof(void*)), \
(RETURN_VALUE), type_size); \
else if(type_size <= sizeof(void*)) {\
memcpy(((char*)(RESULT_FRAME)) + sizeof(void*) - type_size - (type_size % 2), \
(RETURN_VALUE), type_size); \
} \
else { \
memcpy((RESULT_FRAME), (RETURN_VALUE), type_size); \
} \
} \
else if(type_size <= sizeof(void*)) \
memcpy(((char*)(RESULT_FRAME)) + sizeof(void*) - type_size, \
(RETURN_VALUE), type_size); \
else memcpy((RESULT_FRAME), (RETURN_VALUE), type_size); })
/* If the RETTYPE is a structure and the address of the structure value is
passed to the called function, then obtain from ARGS its address. In general
this address is the second pointer into the arguments frame. This macro
should produce 0 if the RETTYPE doesn't match the conditions above. */
#define GET_STRUCT_VALUE_ADDRESS(ARGS, RETTYPE) \
({ int type_size = objc_sizeof_type(RETTYPE); \
((*(RETTYPE) == _C_STRUCT_B || *(RETTYPE) == _C_UNION_B || *(RETTYPE) == _C_ARY_B) \
&& type_size > 4 && type_size != 7 && type_size != 8) ? \
*(void**)(((char*)(ARGS)) + sizeof(void*)) \
: 0; })
/* Prepare ARGS for calling the function. If the function returns a struct by
value, it's the caller responsability to pass to the called function the
address of where to store the structure value. */
#define SET_STRUCT_VALUE_ADDRESS(ARGS, ADDR, RETTYPE) \
*(void**)(((char*)(ARGS)) + sizeof(void*)) = (ADDR)
/* The following macros are used to determine the encoding of a selector given
the types of arguments. This macros follows the similar ones defined in the
target machine description from the compiler sources. */
/* Define a data type for recording info about the arguments list of a method.
A variable of this type is further used by FUNCTION_ARG_ENCODING to
determine the encoding of an argument. This type should record all info
about arguments processed so far. */
#define CUMULATIVE_ARGS int
/* Initialize a variable of type CUMULATIVE_ARGS. This macro is called before
processing the first argument of a method. */
#define INIT_CUMULATIVE_ARGS(CUM) ((CUM) = 0)
/* This macro determines the encoding of the next argument of a method. It is
called repetitively, starting with the first argument and continuing to the
last one. CUM is a variable of type CUMULATIVE_ARGS. TYPE is a NSString
which represents the type of the argument processed. This macro must
produce a NSString whose value represents the encoding and position of the
current argument. STACKSIZE is a variable that counts the number of bytes
occupied by the arguments on the stack. */
#ifndef ROUND
#define ROUND(V, A) \
({ typeof(V) __v=(V); typeof(A) __a=(A); \
__a*((__v+__a-1)/__a); })
#endif
#define FUNCTION_ARG_ENCODING(CUM, TYPE, STACK_ARGSIZE) \
({ id encoding; \
const char* type = [(TYPE) cString]; \
int align = objc_alignof_type(type); \
int type_size = objc_sizeof_type(type); \
\
(CUM) = ROUND((CUM), align); \
if(type_size < sizeof(int)) \
(CUM) += sizeof(int) - ROUND(type_size, align); \
encoding = [NSString stringWithFormat:@"%@%d", \
(TYPE), \
(CUM) + OBJC_FORWARDING_STACK_OFFSET]; \
if((*type == _C_STRUCT_B || *type == _C_UNION_B || *type == _C_ARY_B) \
&& type_size > 2) \
(STACK_ARGSIZE) = (CUM) + ROUND(type_size, align); \
else (STACK_ARGSIZE) = (CUM) + ROUND(type_size, align); \
(CUM) += type_size < sizeof(int) \
? ROUND(type_size, align) \
: ROUND(type_size, sizeof(void*)); \
encoding; })
#endif /* __m68k_h__ */
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.