diff options
Diffstat (limited to 'continue.c')
-rw-r--r-- | continue.c | 35 |
1 files changed, 19 insertions, 16 deletions
@@ -1,4 +1,4 @@ -/* Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc. +/* Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1997 Free Software Foundation, Inc. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -54,7 +54,7 @@ #endif /* For platforms with short integers, we use thrown_value instead of - the value returned from setjmp so that any (long) value can be + the value returned from setjump so that any (long) value can be returned. */ #ifdef SHORT_INT @@ -81,7 +81,7 @@ long stack_size(start) CONTINUATION near the current extent of stack. This newly allocated CONTINUATION is returned if successful, 0 if not. After make_root_continuation() returns, the calling routine still needs - to `setjmp(new_continuation->jmpbuf)' in order to complete the + to `setjump(new_continuation->jmpbuf)' in order to complete the capture of this continuation. */ CONTINUATION *make_root_continuation(stack_base) @@ -101,7 +101,7 @@ CONTINUATION *make_root_continuation(stack_base) to the current top of stack. The newly allocated CONTINUATION is returned if successful, 0 if not. After make_continuation() returns, the calling routine still needs to - `setjmp(new_continuation->jmpbuf)' in order to complete the capture + `setjump(new_continuation->jmpbuf)' in order to complete the capture of this continuation. */ /* Note: allocating local (stack) storage for the CONTINUATION would @@ -150,7 +150,7 @@ void free_continuation(cont) /* Final routine involved in throw()ing to a continuation. After ensuring that there is sufficient room on the stack for the saved continuation, dynthrow() copies the continuation onto the stack and - longjmp()s into it. The routine does not return. */ + longjump()s into it. The routine does not return. */ /* If you use conservative GC and your Sparc(SUN-4) heap is growing out of control: @@ -174,6 +174,9 @@ void free_continuation(cont) Let me know if you try it. */ +/* SCM_GROWTH is how many `long's to grow the stack by when we need room. */ +#define SCM_GROWTH 100 + void dynthrow(a) long *a; { @@ -183,13 +186,13 @@ void dynthrow(a) register long j; register STACKITEM *src, *dst = cont->stkbse; # ifdef STACK_GROWS_UP - if (a[2] && (a - ((long *)a[3]) < 100)) - puts("grow_throw: check if long growth[100]; being optimized out"); + if (a[2] && (a - ((long *)a[3]) < SCM_GROWTH)) + puts("grow_throw: check if long growth[]; being optimized out"); /* if (a[2]) fprintf(stderr, " ct = %ld, dist = %ld\n", a[2], (((long *)a[3]) - a)); */ if PTR_GE(dst + (cont->length), (STACKITEM *)&a) grow_throw(a); # else - if (a[2] && (((long *)a[3]) - a < 100)) - puts("grow_throw: check if long growth[100]; being optimized out"); + if (a[2] && (((long *)a[3]) - a < SCM_GROWTH)) + puts("grow_throw: check if long growth[]; being optimized out"); /* if (a[2]) fprintf(stderr, " ct = %ld, dist = %ld\n", a[2], (((long *)a[3]) - a)); */ dst -= cont->length; if PTR_LE(dst, (STACKITEM *)&a) grow_throw(a); @@ -200,15 +203,15 @@ void dynthrow(a) #endif /* ndef CHEAP_CONTINUATIONS */ #ifdef SHORT_INT thrown_value = val; - longjmp(cont->jmpbuf, 1); + longjump(cont->jmpbuf, 1); #else - longjmp(cont->jmpbuf, val); + longjump(cont->jmpbuf, val); #endif } -/* grow_throw() grows the stack by 100 long words. If the "sizeof - growth" assignment is not sufficient to restrain your overly - optimistic compiler, the stack will grow by much less and +/* grow_throw() grows the stack by SCM_GROWTH long words. If the + "sizeof growth" assignment is not sufficient to restrain your + overly optimistic compiler, the stack will grow by much less and grow_throw() and dynthrow() will waste time calling each other. To fix this you will have to compile grow_throw() in a separate file so the compiler won't be able to guess that the growth array isn't @@ -218,12 +221,12 @@ void dynthrow(a) void grow_throw(a) /* Grow the stack so that there is room */ long *a; /* to copy in the continuation. Then */ { /* retry the throw. */ - long growth[100]; + long growth[SCM_GROWTH]; growth[0] = a[0]; growth[1] = a[1]; growth[2] = a[2] + 1; growth[3] = (long) a; - growth[99] = sizeof growth; + growth[SCM_GROWTH-1] = sizeof growth; dynthrow(growth); } #endif /* ndef CHEAP_CONTINUATIONS */ |