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Diffstat (limited to 'continue.h')
| -rw-r--r-- | continue.h | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/continue.h b/continue.h new file mode 100644 index 0000000..3309172 --- /dev/null +++ b/continue.h @@ -0,0 +1,178 @@ +/* Copyright (C) 1990, 1991, 1992, 1993, 1994, 1995, 1996 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 + * the Free Software Foundation; either version 2, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this software; see the file COPYING. If not, write to + * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. + * + * As a special exception, the Free Software Foundation gives permission + * for additional uses of the text contained in its release of GUILE. + * + * The exception is that, if you link the GUILE library with other files + * to produce an executable, this does not by itself cause the + * resulting executable to be covered by the GNU General Public License. + * Your use of that executable is in no way restricted on account of + * linking the GUILE library code into it. + * + * This exception does not however invalidate any other reasons why + * the executable file might be covered by the GNU General Public License. + * + * This exception applies only to the code released by the + * Free Software Foundation under the name GUILE. If you copy + * code from other Free Software Foundation releases into a copy of + * GUILE, as the General Public License permits, the exception does + * not apply to the code that you add in this way. To avoid misleading + * anyone as to the status of such modified files, you must delete + * this exception notice from them. + * + * If you write modifications of your own for GUILE, it is your choice + * whether to permit this exception to apply to your modifications. + * If you do not wish that, delete this exception notice. + */ + +/* "continue.h" Scheme Continuations for C. + Author: Aubrey Jaffer. */ + +#ifdef vms +# ifndef CHEAP_CONTINUATIONS + + typedef int jmp_buf[17]; + extern int setjump(jmp_buf env); + extern int longjump(jmp_buf env, int ret); + +# define setjmp setjump +# define longjmp longjump +# else +# include <setjmp.h> +# endif +#else /* ndef vms */ +# ifdef _CRAY1 + typedef int jmp_buf[112]; + extern int setjump(jmp_buf env); + extern int longjump(jmp_buf env, int ret); + +# define setjmp setjump +# define longjmp longjump +# else /* ndef _CRAY1 */ +# include <setjmp.h> +# endif /* ndef _CRAY1 */ +#endif /* ndef vms */ + +/* `other' is a CONTINUATION slot for miscellaneous data of type + CONTINUATION_OTHER. */ + +#ifndef CONTINUATION_OTHER +# define CONTINUATION_OTHER int +#endif + +/* If stack is not longword aligned then */ + +/* #define SHORT_ALIGN */ +#ifdef THINK_C +# define SHORT_ALIGN +#endif +#ifdef MSDOS +# define SHORT_ALIGN +#endif +#ifdef atarist +# define SHORT_ALIGN +#endif + +#ifdef SHORT_ALIGN +typedef short STACKITEM; +#else +typedef long STACKITEM; +#endif + +struct Continuation {jmp_buf jmpbuf; + long thrwval; + long length; + STACKITEM *stkbse; + CONTINUATION_OTHER other; + struct Continuation *parent; + }; +typedef struct Continuation CONTINUATION; + +#ifndef P +# ifdef USE_ANSI_PROTOTYPES +# define P(s) s +# else +# define P(s) () +# endif +#endif + +extern long thrown_value; +long stack_size P((STACKITEM *start)); +CONTINUATION *make_root_continuation P((STACKITEM *stack_base)); +CONTINUATION *make_continuation P((CONTINUATION *parent_cont)); +void free_continuation P((CONTINUATION *cont)); +void dynthrow P((long *a)); +void grow_throw P((long *a)); +void throw_to_continuation P((CONTINUATION *cont, long val, + CONTINUATION *root_cont)); + +/* how to get the local definition for malloc */ + +#ifndef STDC_HEADERS +# ifndef malloc + char *malloc P((sizet size)); +# endif + char *realloc P((char *ptr, sizet size)); +#endif + +/* PTR_LT defines how to compare two addresses (which may not be in + the same array). */ + +#if defined(__TURBOC__) && !defined(__TOS__) +# ifdef PROT386 +# define PTR_LT(x, y) (((long)(x)) < ((long)(y))) +# else +# define PTR_LT(x, y) ((x) < (y)) +# endif +#else /* not __TURBOC__ */ +# ifdef nosve +# define PTR_MASK 0xffffffffffff +# define PTR_LT(x, y) (((int)(x)&PTR_MASK) < ((int)(y)&PTR_MASK)) +# else +# define PTR_LT(x, y) ((x) < (y)) +# endif +#endif + +#define PTR_GT(x, y) PTR_LT(y, x) +#define PTR_LE(x, y) (!PTR_GT(x, y)) +#define PTR_GE(x, y) (!PTR_LT(x, y)) + +/* James Clark came up with this neat one instruction fix for + continuations on the SPARC. It flushes the register windows so + that all the state of the process is contained in the stack. */ + +#ifdef sparc +# define FLUSH_REGISTER_WINDOWS asm("ta 3") +#else +# define FLUSH_REGISTER_WINDOWS /* empty */ +#endif + +/* If stacks grow up then */ + +/* #define STACK_GROWS_UP */ +#ifdef hp9000s800 +# define STACK_GROWS_UP +#endif +#ifdef pyr +# define STACK_GROWS_UP +#endif +#ifdef nosve +# define STACK_GROWS_UP +#endif +#ifdef _UNICOS +# define STACK_GROWS_UP +#endif |