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Annotation of mstools/h/stdarg.h, revision 1.1.1.4

1.1       root        1: /***
                      2: *stdarg.h - defines ANSI-style macros for variable argument functions
                      3: *
1.1.1.3   root        4: *      Copyright (c) 1985-1993, Microsoft Corporation. All rights reserved.
1.1       root        5: *
                      6: *Purpose:
                      7: *      This file defines ANSI-style macros for accessing arguments
                      8: *      of functions which take a variable number of arguments.
                      9: *      [ANSI]
                     10: *
                     11: ****/
                     12: 
                     13: #ifndef _INC_STDARG
                     14: 
                     15: #ifdef __cplusplus
                     16: extern "C" {
                     17: #endif
                     18: 
                     19: 
                     20: 
                     21: #ifndef _VA_LIST_DEFINED
1.1.1.3   root       22: #if    defined(_ALPHA_)
                     23: typedef struct {
                     24:        char *a0;       /* pointer to first homed integer argument */
                     25:        int offset;     /* byte offset of next parameter */
                     26: } va_list;
                     27: #else
1.1       root       28: typedef char * va_list;
1.1.1.3   root       29: #endif
1.1       root       30: #define _VA_LIST_DEFINED
                     31: #endif
                     32: 
1.1.1.3   root       33: 
                     34: #ifdef _M_IX86
1.1.1.2   root       35: 
1.1       root       36: #define _INTSIZEOF(n)  ( (sizeof(n) + sizeof(int) - 1) & ~(sizeof(int) - 1) ) 
                     37: 
                     38: #define va_start(ap,v) ( ap = (va_list)&v + _INTSIZEOF(v) )
                     39: #define va_arg(ap,t)   ( *(t *)((ap += _INTSIZEOF(t)) - _INTSIZEOF(t)) )
                     40: #define va_end(ap)     ( ap = (va_list)0 )
                     41: 
1.1.1.2   root       42: #endif
                     43: 
1.1.1.3   root       44: #if     defined(_M_MRX000) || defined(_MIPS_)
1.1.1.2   root       45: 
                     46: #define va_start(ap,v) ap  = (va_list)&v + sizeof(v)
                     47: #define va_end(list)
                     48: #define va_arg(list, mode) ((mode *)(list =\
                     49:  (char *) ((((int)list + (__builtin_alignof(mode)<=4?3:7)) &\
                     50:  (__builtin_alignof(mode)<=4?-4:-8))+sizeof(mode))))[-1]
                     51: 
                     52: /*  +++++++++++++++++++++++++++++++++++++++++++
                     53:     Because of parameter passing conventions in C:
                     54:     use mode=int for char, and short types
                     55:     use mode=double for float types
                     56:     use a pointer for array types
                     57:     +++++++++++++++++++++++++++++++++++++++++++ */
                     58: 
                     59: 
                     60: #endif
1.1.1.3   root       61: 
1.1.1.4 ! root       62: #if     defined(_ALPHA_)
1.1.1.3   root       63: 
                     64: /*
                     65:  * The Alpha compiler supports two builtin functions that are used to
                     66:  * implement stdarg/varargs.  The __builtin_va_start function is used
                     67:  * by va_start to initialize the data structure that locates the next
                     68:  * argument.  The __builtin_isfloat function is used by va_arg to pick
                     69:  * which part of the home area a given register argument is stored in.
                     70:  * The home area is where up to six integer and/or six floating point
                     71:  * register arguments are stored down (so they can also be referenced
                     72:  * by a pointer like any arguments passed on the stack).
                     73:  */
                     74: 
                     75: #ifdef _CFRONT
                     76: extern __builtin_va_start(va_list, ...);
                     77: #define __builtin_isfloat(a) __builtin_alignof(a)
1.1.1.4 ! root       78: #elif defined(__cplusplus)
        !            79: extern __builtin_va_start(va_list, ...);
1.1.1.2   root       80: #endif
                     81: 
1.1.1.3   root       82: #define va_start(list, v) __builtin_va_start(list, v, 1)
                     83: #define va_end(list)
                     84: #define va_arg(list, mode) \
                     85:     ( *(        ((list).offset += ((int)sizeof(mode) + 7) & -8) , \
                     86:         (mode *)((list).a0 + (list).offset - \
                     87:                     ((__builtin_isfloat(mode) && (list).offset <= (6 * 8)) ? \
                     88:                         (6 * 8) + 8 : ((int)sizeof(mode) + 7) & -8) \
                     89:                 ) \
                     90:        ) \
                     91:     )
                     92: 
1.1.1.4 ! root       93: #endif /* _ALPHA_ */
1.1.1.2   root       94: 
                     95: 
1.1       root       96: #ifdef __cplusplus
                     97: }
                     98: #endif
                     99: 
                    100: #define _INC_STDARG
                    101: #endif /* _INC_STDARG */

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