diff options
Diffstat (limited to 'gc/setjmp_t.c')
-rw-r--r-- | gc/setjmp_t.c | 114 |
1 files changed, 0 insertions, 114 deletions
diff --git a/gc/setjmp_t.c b/gc/setjmp_t.c deleted file mode 100644 index 07686ef..0000000 --- a/gc/setjmp_t.c +++ /dev/null @@ -1,114 +0,0 @@ -/* - * Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved. - * - * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED - * OR IMPLIED. ANY USE IS AT YOUR OWN RISK. - * - * Permission is hereby granted to use or copy this program - * for any purpose, provided the above notices are retained on all copies. - * Permission to modify the code and to distribute modified code is granted, - * provided the above notices are retained, and a notice that the code was - * modified is included with the above copyright notice. - */ - -/* Check whether setjmp actually saves registers in jmp_buf. */ -/* If it doesn't, the generic mark_regs code won't work. */ -/* Compilers vary as to whether they will put x in a */ -/* (callee-save) register without -O. The code is */ -/* contrived such that any decent compiler should put x in */ -/* a callee-save register with -O. Thus it is is */ -/* recommended that this be run optimized. (If the machine */ -/* has no callee-save registers, then the generic code is */ -/* safe, but this will not be noticed by this piece of */ -/* code.) This test appears to be far from perfect. */ -#include <stdio.h> -#include <setjmp.h> -#include <string.h> -#include "private/gcconfig.h" - -#ifdef OS2 -/* GETPAGESIZE() is set to getpagesize() by default, but that */ -/* doesn't really exist, and the collector doesn't need it. */ -#define INCL_DOSFILEMGR -#define INCL_DOSMISC -#define INCL_DOSERRORS -#include <os2.h> - -int -getpagesize() -{ - ULONG result[1]; - - if (DosQuerySysInfo(QSV_PAGE_SIZE, QSV_PAGE_SIZE, - (void *)result, sizeof(ULONG)) != NO_ERROR) { - fprintf(stderr, "DosQuerySysInfo failed\n"); - result[0] = 4096; - } - return((int)(result[0])); -} -#endif - -struct {char a_a; char * a_b;} a; - -int * nested_sp() -{ - int dummy; - - return(&dummy); -} - -main() -{ - int dummy; - long ps = GETPAGESIZE(); - jmp_buf b; - register int x = (int)strlen("a"); /* 1, slightly disguised */ - static int y = 0; - - printf("This appears to be a %s running %s\n", MACH_TYPE, OS_TYPE); - if (nested_sp() < &dummy) { - printf("Stack appears to grow down, which is the default.\n"); - printf("A good guess for STACKBOTTOM on this machine is 0x%lx.\n", - ((unsigned long)(&dummy) + ps) & ~(ps-1)); - } else { - printf("Stack appears to grow up.\n"); - printf("Define STACK_GROWS_UP in gc_private.h\n"); - printf("A good guess for STACKBOTTOM on this machine is 0x%lx.\n", - ((unsigned long)(&dummy) + ps) & ~(ps-1)); - } - printf("Note that this may vary between machines of ostensibly\n"); - printf("the same architecture (e.g. Sun 3/50s and 3/80s).\n"); - printf("On many machines the value is not fixed.\n"); - printf("A good guess for ALIGNMENT on this machine is %ld.\n", - (unsigned long)(&(a.a_b))-(unsigned long)(&a)); - - /* Encourage the compiler to keep x in a callee-save register */ - x = 2*x-1; - printf(""); - x = 2*x-1; - setjmp(b); - if (y == 1) { - if (x == 2) { - printf("Generic mark_regs code probably wont work\n"); -# if defined(SPARC) || defined(RS6000) || defined(VAX) || defined(MIPS) || defined(M68K) || defined(I386) || defined(NS32K) || defined(RT) - printf("Assembly code supplied\n"); -# else - printf("Need assembly code\n"); -# endif - } else if (x == 1) { - printf("Generic mark_regs code may work\n"); - } else { - printf("Very strange setjmp implementation\n"); - } - } - y++; - x = 2; - if (y == 1) longjmp(b,1); - return(0); -} - -int g(x) -int x; -{ - return(x); -} |