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/* classes: h_files */ #ifndef SCM___SCM_H #define SCM___SCM_H /* Copyright (C) 1995,1996,1998,1999,2000,2001 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, Inc., 59 Temple Place, Suite 330, * Boston, MA 02111-1307 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. */ /* "What's the difference between _scm.h and __scm.h?" _scm.h is not installed; it's only visible to the libguile sources themselves. __scm.h is installed, and is #included by <libguile.h>. If both the client and libguile need some piece of information, and it doesn't fit well into the header file for any particular module, it should go in __scm.h. */ /* {Compiler hints} * * The following macros are used to provide additional information for the * compiler, which may help to do better error checking and code * optimization. A second benefit of these macros is, that they also provide * additional information to the developers. */ /* The macro SCM_NORETURN indicates that a function will never return. * Examples: * 1) int foo (char arg) SCM_NORETURN; */ #ifdef __GNUC__ #define SCM_NORETURN __attribute__ ((noreturn)) #else #define SCM_NORETURN #endif /* The macro SCM_UNUSED indicates that a function, function argument or * variable may potentially be unused. * Examples: * 1) static int unused_function (char arg) SCM_UNUSED; * 2) int foo (char unused_argument SCM_UNUSED); * 3) int unused_variable SCM_UNUSED; */ #ifdef __GNUC__ #define SCM_UNUSED __attribute__ ((unused)) #else #define SCM_UNUSED #endif /* {Supported Options} * * These may be defined or undefined. */ /* Old async mechanism */ /* #define GUILE_OLD_ASYNC_CLICK */ /* #define GUILE_DEBUG_FREELIST */ /* If the compile FLAG `SCM_CAUTIOUS' is #defined then the number of * arguments is always checked for application of closures. If the * compile FLAG `SCM_RECKLESS' is #defined then they are not checked. * Otherwise, number of argument checks for closures are made only when * the function position (whose value is the closure) of a combination is * not an ILOC or GLOC. When the function position of a combination is a * symbol it will be checked only the first time it is evaluated because * it will then be replaced with an ILOC or GLOC. */ #undef SCM_RECKLESS #define SCM_CAUTIOUS /* After looking up a local for the first time, rewrite the * code graph, caching its position. */ #define MEMOIZE_LOCALS /* All the number support there is. */ #define BIGNUMS /* GC should relinquish empty cons-pair arenas. */ /* cmm:FIXME look at this after done mangling the GC */ /* #define GC_FREE_SEGMENTS */ /* Provide a scheme-accessible count-down timer that * generates a pseudo-interrupt. */ #define TICKS /* Use engineering notation when converting numbers strings? */ #undef ENGNOT /* {Unsupported Options} * * These must be defined as given here. */ #define CCLO /* Guile Scheme supports the #f/() distinction; Guile Lisp won't. We have horrible plans for their unification. */ #undef SICP /* Random options (not yet supported or in final form). */ #define STACK_CHECKING #undef NO_CEVAL_STACK_CHECKING /* What did the configure script discover about the outside world? */ #include "libguile/scmconfig.h" /* {Debugging Options} * * These compile time options determine whether to include code that is only * useful for debugging guile itself or C level extensions to guile. The * common prefix for all option macros of this kind is "SCM_DEBUG_". It is * guaranteed that a macro named SCM_DEBUG_XXX is defined to be either 0 or 1, * i. e. there is no need to test for the undefined case. This allows to use * these definitions comfortably in macro code, as in the following example: * #define FOO do { if (SCM_DEBUG_XXX) bar(); else baz(); } while (0) * Any sane compiler will remove the unused branch without any performance * penalty for the resulting code. * * Note: Some SCM_DEBUG_XXX options are not settable at configure time. * To change the value of such options you will have to edit this header * file or give suitable options to make, like: * make all CFLAGS="-DSCM_DEBUG_XXX=1 ..." */ /* The value of SCM_DEBUG determines the default for most of the not yet * defined debugging options. This allows, for example, to enable most of the * debugging options by simply defining SCM_DEBUG as 1. */ #ifndef SCM_DEBUG #define SCM_DEBUG 0 #endif /* If SCM_DEBUG_CELL_ACCESSES is set to 1, cell accesses will perform * exhaustive parameter checking: It will be verified that cell parameters * actually point to a valid heap cell. Note: If this option is enabled, * guile will run about ten times slower than normally. */ #ifndef SCM_DEBUG_CELL_ACCESSES #define SCM_DEBUG_CELL_ACCESSES SCM_DEBUG #endif /* If SCM_DEBUG_DEPRECATED is set to 1, deprecated code is not compiled. This * can be used by developers to get rid of references to deprecated code. */ #ifndef SCM_DEBUG_DEPRECATED #define SCM_DEBUG_DEPRECATED SCM_DEBUG #endif /* If SCM_DEBUG_INTERRUPTS is set to 1, with every deferring and allowing of * interrupts a consistency check will be performed. */ #ifndef SCM_DEBUG_INTERRUPTS #define SCM_DEBUG_INTERRUPTS SCM_DEBUG #endif /* If SCM_DEBUG_PAIR_ACCESSES is set to 1, accesses to cons cells will be * exhaustively checked. Note: If this option is enabled, guile will run * slower than normally. */ #ifndef SCM_DEBUG_PAIR_ACCESSES #define SCM_DEBUG_PAIR_ACCESSES SCM_DEBUG #endif /* If SCM_DEBUG_REST_ARGUMENT is set to 1, functions that take rest arguments * will check whether the rest arguments are actually passed as a proper list. * Otherwise, if SCM_DEBUG_REST_ARGUMENT is 0, functions that take rest * arguments will take it for granted that these are passed as a proper list. */ #ifndef SCM_DEBUG_REST_ARGUMENT #define SCM_DEBUG_REST_ARGUMENT SCM_DEBUG #endif /* Use this for _compile time_ type checking only, since the compiled result * will be quite inefficient. The right way to make use of this option is to * do a 'make clean; make CFLAGS=-DSCM_DEBUG_TYPING_STRICTNESS=1', fix your * errors, and then do 'make clean; make'. */ #ifndef SCM_DEBUG_TYPING_STRICTNESS #define SCM_DEBUG_TYPING_STRICTNESS 1 #endif /* If SCM_ENABLE_VCELLS is set to 1, a couple of functions that deal * with vcells are defined for compatability reasons. Supporting * vcells reduces performance however. * * We use a dedicated macro instead of just SCM_DEBUG_DEPRECATED so * that code the belongs to the `vcell' feature is easier to find. */ #define SCM_ENABLE_VCELLS !SCM_DEBUG_DEPRECATED #ifdef HAVE_LONG_LONGS /* Some auto-generated .h files contain unused prototypes * that need these typedefs. */ #if (SCM_DEBUG_DEPRECATED == 0) typedef long long long_long; typedef unsigned long long ulong_long; #endif #endif /* HAVE_LONG_LONGS */ /* {Architecture and compiler properties} * * Guile as of today can only work on systems which fulfill at least the * following requirements: * - long ints have at least 32 bits. * Guile's type system is based on this assumption. * - long ints consist of at least four characters. * It is assumed that cells, i. e. pairs of long ints, are eight character * aligned, because three bits of a cell pointer are used for type data. * - sizeof (void*) == sizeof (long int) * Pointers are stored in SCM objects, and sometimes SCM objects are passed * as void*. Thus, there has to be a one-to-one correspondence. * - numbers are encoded using two's complement. * The implementation of the bitwise scheme level operations is based on * this assumption. * - ... add more */ #ifndef HAVE_PTRDIFF_T typedef long ptrdiff_t; #endif #ifdef HAVE_LIMITS_H # include <limits.h> #endif #ifdef CHAR_BIT # define SCM_CHAR_BIT CHAR_BIT #else # define SCM_CHAR_BIT 8 #endif #ifdef LONG_BIT # define SCM_LONG_BIT LONG_BIT #else # define SCM_LONG_BIT (SCM_CHAR_BIT * sizeof (long) / sizeof (char)) #endif #ifdef UCHAR_MAX # define SCM_CHAR_CODE_LIMIT (UCHAR_MAX + 1L) #else # define SCM_CHAR_CODE_LIMIT 256L #endif #ifdef STDC_HEADERS # include <stdlib.h> # if HAVE_SYS_TYPES_H # include <sys/types.h> # endif # if HAVE_SYS_STDTYPES_H # include <sys/stdtypes.h> # endif # include <stddef.h> #endif /* def STDC_HEADERS */ #if (SCM_DEBUG_DEPRECATED == 0) # define scm_sizet size_t #endif #include "libguile/tags.h" #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 */ /* 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. */ #if defined (sparc) || defined (__sparc__) || defined (__sparc) # define SCM_FLUSH_REGISTER_WINDOWS asm("ta 3") #else # define SCM_FLUSH_REGISTER_WINDOWS /* empty */ #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 SCM_STACKITEM; #else typedef long SCM_STACKITEM; #endif #ifndef USE_THREADS #define SCM_CRITICAL_SECTION_START #define SCM_CRITICAL_SECTION_END #define SCM_THREAD_SWITCHING_CODE #endif #ifdef GUILE_OLD_ASYNC_CLICK extern unsigned int scm_async_clock; #define SCM_ASYNC_TICK \ do { \ if (0 == --scm_async_clock) \ scm_async_click (); \ } while(0) #else extern int scm_asyncs_pending_p; #define SCM_ASYNC_TICK /*fixme* should change names */ \ do { \ if (scm_asyncs_pending_p) \ scm_async_click (); \ } while (0) #endif #if (SCM_DEBUG_INTERRUPTS == 1) #include <stdio.h> #define SCM_CHECK_NOT_DISABLED \ do { \ if (scm_ints_disabled) \ fprintf(stderr, "ints already disabled (at %s:%d)\n", \ __FILE__, __LINE__); \ } while (0) #define SCM_CHECK_NOT_ENABLED \ do { \ if (!scm_ints_disabled) \ fprintf(stderr, "ints already enabled (at %s:%d)\n", \ __FILE__, __LINE__); \ } while (0) #else #define SCM_CHECK_NOT_DISABLED #define SCM_CHECK_NOT_ENABLED #endif /* Anthony Green writes: When the compiler sees... DEFER_INTS; [critical code here] ALLOW_INTS; ...it doesn't actually promise to keep the critical code within the boundries of the DEFER/ALLOW_INTS instructions. It may very well schedule it outside of the magic defined in those macros. However, GCC's volatile asm feature forms a barrier over which code is never moved. So if you add... asm (""); ...to each of the DEFER_INTS and ALLOW_INTS macros, the critical code will always remain in place. asm's without inputs or outputs are implicitly volatile. */ #ifdef __GNUC__ #define SCM_FENCE asm /* volatile */ ("") #else #define SCM_FENCE #endif #define SCM_DEFER_INTS \ do { \ SCM_FENCE; \ SCM_CHECK_NOT_DISABLED; \ SCM_CRITICAL_SECTION_START; \ SCM_FENCE; \ scm_ints_disabled = 1; \ SCM_FENCE; \ } while (0) #define SCM_ALLOW_INTS_ONLY \ do { \ SCM_CRITICAL_SECTION_END; \ scm_ints_disabled = 0; \ } while (0) #define SCM_ALLOW_INTS \ do { \ SCM_FENCE; \ SCM_CHECK_NOT_ENABLED; \ SCM_CRITICAL_SECTION_END; \ SCM_FENCE; \ scm_ints_disabled = 0; \ SCM_FENCE; \ SCM_THREAD_SWITCHING_CODE; \ SCM_FENCE; \ } while (0) #define SCM_REDEFER_INTS \ do { \ SCM_FENCE; \ SCM_CRITICAL_SECTION_START; \ ++scm_ints_disabled; \ SCM_FENCE; \ } while (0) #define SCM_REALLOW_INTS \ do { \ SCM_FENCE; \ SCM_CRITICAL_SECTION_END; \ SCM_FENCE; \ --scm_ints_disabled; \ SCM_FENCE; \ } while (0) #define SCM_TICK \ do { \ SCM_ASYNC_TICK; \ SCM_THREAD_SWITCHING_CODE; \ } while (0) /* Classification of critical sections * * When Guile moves to POSIX threads, it won't be possible to prevent * context switching. In fact, the whole idea of context switching is * bogus if threads are run by different processors. Therefore, we * must ultimately eliminate all critical sections or enforce them by * use of mutecis. * * All instances of SCM_DEFER_INTS and SCM_ALLOW_INTS should therefore * be classified and replaced by one of the delimiters below. If you * understand what this is all about, I'd like to encourage you to * help with this task. The set of classes below must of course be * incrementally augmented. * * MDJ 980419 <djurfeldt@nada.kth.se> */ /* A sections * * Allocation of a cell with type tag in the CAR. * * With POSIX threads, each thread will have a private pool of free * cells. Therefore, this type of section can be removed. But! It * is important that the CDR is initialized first (with the CAR still * indicating a free cell) so that we can guarantee a consistent heap * at all times. */ #define SCM_ENTER_A_SECTION SCM_CRITICAL_SECTION_START #define SCM_EXIT_A_SECTION SCM_CRITICAL_SECTION_END /** SCM_ASSERT ** **/ #ifdef SCM_RECKLESS #define SCM_ASSERT(_cond, _arg, _pos, _subr) #define SCM_ASSERT_TYPE(_cond, _arg, _pos, _subr, _msg) #define SCM_ASRTGO(_cond, _label) #else #define SCM_ASSERT(_cond, _arg, _pos, _subr) \ if (!(_cond)) \ scm_wrong_type_arg (_subr, _pos, _arg) #define SCM_ASSERT_TYPE(_cond, _arg, _pos, _subr, _msg) \ if (!(_cond)) \ scm_wrong_type_arg_msg(_subr, _pos, _arg, _msg) #define SCM_ASRTGO(_cond, _label) \ if (!(_cond)) \ goto _label #endif /* * SCM_WTA_DISPATCH */ /* Dirk:FIXME:: In all of the SCM_WTA_DISPATCH_* macros it is assumed that * 'gf' is zero if uninitialized. It would be cleaner if some valid SCM value * like SCM_BOOL_F or SCM_UNDEFINED was chosen. */ extern SCM scm_call_generic_0 (SCM gf); #define SCM_WTA_DISPATCH_0(gf, subr) \ return (SCM_UNPACK (gf) \ ? scm_call_generic_0 ((gf)) \ : (scm_error_num_args_subr ((subr)), SCM_UNSPECIFIED)) #define SCM_GASSERT0(cond, gf, subr) \ if (!(cond)) SCM_WTA_DISPATCH_0((gf), (subr)) extern SCM scm_call_generic_1 (SCM gf, SCM a1); #define SCM_WTA_DISPATCH_1(gf, a1, pos, subr) \ return (SCM_UNPACK (gf) \ ? scm_call_generic_1 ((gf), (a1)) \ : (scm_wrong_type_arg ((subr), (pos), (a1)), SCM_UNSPECIFIED)) #define SCM_GASSERT1(cond, gf, a1, pos, subr) \ if (!(cond)) SCM_WTA_DISPATCH_1((gf), (a1), (pos), (subr)) extern SCM scm_call_generic_2 (SCM gf, SCM a1, SCM a2); #define SCM_WTA_DISPATCH_2(gf, a1, a2, pos, subr) \ return (SCM_UNPACK (gf) \ ? scm_call_generic_2 ((gf), (a1), (a2)) \ : (scm_wrong_type_arg ((subr), (pos), \ (pos) == SCM_ARG1 ? (a1) : (a2)), \ SCM_UNSPECIFIED)) #define SCM_GASSERT2(cond, gf, a1, a2, pos, subr) \ if (!(cond)) SCM_WTA_DISPATCH_2((gf), (a1), (a2), (pos), (subr)) extern SCM scm_apply_generic (SCM gf, SCM args); #define SCM_WTA_DISPATCH_n(gf, args, pos, subr) \ return (SCM_UNPACK (gf) \ ? scm_apply_generic ((gf), (args)) \ : (scm_wrong_type_arg ((subr), (pos), \ scm_list_ref ((args), \ SCM_MAKINUM ((pos) - 1))), \ SCM_UNSPECIFIED)) #define SCM_GASSERTn(cond, gf, args, pos, subr) \ if (!(cond)) SCM_WTA_DISPATCH_n((gf), (args), (pos), (subr)) #ifndef SCM_MAGIC_SNARFER /* Let these macros pass through if we are snarfing; thus we can tell the difference between the use of an actual number vs. the use of one of these macros -- actual numbers in SCM_VALIDATE_* and SCM_ASSERT constructs must match the formal argument name, but using SCM_ARG* avoids the test */ #define SCM_ARGn 0 #define SCM_ARG1 1 #define SCM_ARG2 2 #define SCM_ARG3 3 #define SCM_ARG4 4 #define SCM_ARG5 5 #define SCM_ARG6 6 #define SCM_ARG7 7 #if (SCM_DEBUG_DEPRECATED == 0) /* Use SCM_WRONG_NUM_ARGS instead of: */ #define SCM_WNA 8 /* Use SCM_ASSERT_RANGE or SCM_VALIDATE_XXX_RANGE instead of: */ #define SCM_OUTOFRANGE 10 /* Use scm_memory_error instead of: */ #define SCM_NALLOC 11 #define SCM_HUP_SIGNAL 14 #define SCM_INT_SIGNAL 15 #define SCM_FPE_SIGNAL 16 #define SCM_BUS_SIGNAL 17 #define SCM_SEGV_SIGNAL 18 #define SCM_ALRM_SIGNAL 19 #define SCM_GC_SIGNAL 20 #define SCM_TICK_SIGNAL 21 #define SCM_SIG_ORD(X) ((X) - SCM_HUP_SIGNAL) #define SCM_ORD_SIG(X) ((X) + SCM_HUP_SIGNAL) #define SCM_NUM_SIGS (SCM_SIG_ORD (SCM_TICK_SIGNAL) + 1) #endif /* SCM_DEBUG_DEPRECATED == 0 */ #endif /* SCM_MAGIC_SNARFER */ /* SCM_EXIT_SUCCESS is the default code to return from SCM if no errors * were encountered. SCM_EXIT_FAILURE is the default code to return from * SCM if errors were encountered. The return code can be explicitly * specified in a SCM program with (scm_quit <n>). */ #ifndef SCM_EXIT_SUCCESS #ifdef vms #define SCM_EXIT_SUCCESS 1 #else #define SCM_EXIT_SUCCESS 0 #endif /* def vms */ #endif /* ndef SCM_EXIT_SUCCESS */ #ifndef SCM_EXIT_FAILURE #ifdef vms #define SCM_EXIT_FAILURE 2 #else #define SCM_EXIT_FAILURE 1 #endif /* def vms */ #endif /* ndef SCM_EXIT_FAILURE */ #endif /* SCM___SCM_H */ /* Local Variables: c-file-style: "gnu" End: */