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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [boehm-gc/] [setjmp_t.c] - Blame information for rev 753

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Line No. Rev Author Line
1 721 jeremybenn
/*
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 * Copyright (c) 1991-1994 by Xerox Corporation.  All rights reserved.
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 *
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 * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
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 * OR IMPLIED.  ANY USE IS AT YOUR OWN RISK.
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 *
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 * Permission is hereby granted to use or copy this program
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 * for any purpose,  provided the above notices are retained on all copies.
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 * Permission to modify the code and to distribute modified code is granted,
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 * provided the above notices are retained, and a notice that the code was
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 * modified is included with the above copyright notice.
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 */
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/* Check whether setjmp actually saves registers in jmp_buf. */
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/* If it doesn't, the generic mark_regs code won't work.     */
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/* Compilers vary as to whether they will put x in a         */
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/* (callee-save) register without -O.  The code is           */
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/* contrived such that any decent compiler should put x in   */
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/* a callee-save register with -O.  Thus it is is            */
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/* recommended that this be run optimized.  (If the machine  */
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/* has no callee-save registers, then the generic code is    */
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/* safe, but this will not be noticed by this piece of       */
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/* code.)  This test appears to be far from perfect.         */
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#include <stdio.h>
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#include <setjmp.h>
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#include <string.h>
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#include "private/gcconfig.h"
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#ifdef OS2
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/* GETPAGESIZE() is set to getpagesize() by default, but that   */
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/* doesn't really exist, and the collector doesn't need it.     */
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#define INCL_DOSFILEMGR
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#define INCL_DOSMISC
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#define INCL_DOSERRORS
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#include <os2.h>
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int
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getpagesize()
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{
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    ULONG result[1];
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    if (DosQuerySysInfo(QSV_PAGE_SIZE, QSV_PAGE_SIZE,
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                        (void *)result, sizeof(ULONG)) != NO_ERROR) {
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        fprintf(stderr, "DosQuerySysInfo failed\n");
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        result[0] = 4096;
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    }
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    return((int)(result[0]));
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}
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#endif
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struct {char a_a; char * a_b;} a;
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int * nested_sp()
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{
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    int dummy;
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    return(&dummy);
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}
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main()
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{
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        int dummy;
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        long ps = GETPAGESIZE();
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        jmp_buf b;
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        register int x = (int)strlen("a");  /* 1, slightly disguised */
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        static int y = 0;
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        printf("This appears to be a %s running %s\n", MACH_TYPE, OS_TYPE);
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        if (nested_sp() < &dummy) {
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          printf("Stack appears to grow down, which is the default.\n");
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          printf("A good guess for STACKBOTTOM on this machine is 0x%lx.\n",
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                 ((unsigned long)(&dummy) + ps) & ~(ps-1));
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        } else {
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          printf("Stack appears to grow up.\n");
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          printf("Define STACK_GROWS_UP in gc_private.h\n");
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          printf("A good guess for STACKBOTTOM on this machine is 0x%lx.\n",
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                 ((unsigned long)(&dummy) + ps) & ~(ps-1));
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        }
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        printf("Note that this may vary between machines of ostensibly\n");
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        printf("the same architecture (e.g. Sun 3/50s and 3/80s).\n");
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        printf("On many machines the value is not fixed.\n");
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        printf("A good guess for ALIGNMENT on this machine is %ld.\n",
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               (unsigned long)(&(a.a_b))-(unsigned long)(&a));
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        /* Encourage the compiler to keep x in a callee-save register */
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        x = 2*x-1;
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        printf("");
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        x = 2*x-1;
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        setjmp(b);
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        if (y == 1) {
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            if (x == 2) {
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                printf("Generic mark_regs code probably wont work\n");
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#               if defined(SPARC) || defined(RS6000) || defined(VAX) || defined(MIPS) || defined(M68K) || defined(I386) || defined(NS32K) || defined(RT)
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                    printf("Assembly code supplied\n");
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#               else
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                    printf("Need assembly code\n");
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#               endif
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            } else if (x == 1) {
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                printf("Generic mark_regs code may work\n");
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            } else {
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                printf("Very strange setjmp implementation\n");
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            }
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        }
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        y++;
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        x = 2;
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        if (y == 1) longjmp(b,1);
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        return(0);
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}
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int g(x)
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int x;
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{
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        return(x);
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}

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