mirror of
https://git.savannah.gnu.org/git/guile.git
synced 2025-04-30 11:50:28 +02:00
d51406fe87
* libguile/vm-engine.c (vm_run): Add new error case, vm_error_not_enough_values. * libguile/vm-i-system.c (goto/nargs, call/nargs): So, in these cases, if we get too many values, we don't truncate the values like we do in the single-value continuation case, or in the mvbind case. What to do? I guess we either truncate them here, or only allow the correct number of values. Dunno. Mark the code as a fixme. (truncate-values): New instruction, for mv-bind: checks that the number of values on the stack is compatible with the number of bindings we have arranged for them, truncating if necessary. * module/language/scheme/translate.scm (custom-transformer-table): Compile receive as a primary form -- not so much because it is a primary form, but more to test the mv-bind machinery. Also it's more efficient, I think. * module/system/il/compile.scm (lift-variables!): New helper, factored out of `optimize'. (optimize): Add a few more cases. Adapt `lambda' optimization, which isn't much. I'm not happy with ghil as a mungeable language. Add a case for call-with-values with the second argument is a lambda: lift the lambda. Untested. (codegen): Refactor the push-bindings! code. Compile mv-bind. * module/system/il/ghil.scm (<ghil-mv-bind>): Add mv-bind construct, along with its procedures. * module/system/il/glil.scm (<glil-mv-bind>): Add mv-bind construct, different from the high-level one. It makes sense in the source, I think. * module/system/vm/assemble.scm (codegen): Assemble glil-mv-bind by pushing onto the bindings list, and actually push some code to truncate the values.
995 lines
20 KiB
C
995 lines
20 KiB
C
/* Copyright (C) 2001 Free Software Foundation, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307 USA
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*
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* As a special exception, the Free Software Foundation gives permission
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* for additional uses of the text contained in its release of GUILE.
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*
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* The exception is that, if you link the GUILE library with other files
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* to produce an executable, this does not by itself cause the
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* resulting executable to be covered by the GNU General Public License.
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* Your use of that executable is in no way restricted on account of
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* linking the GUILE library code into it.
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*
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* This exception does not however invalidate any other reasons why
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* the executable file might be covered by the GNU General Public License.
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*
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* This exception applies only to the code released by the
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* Free Software Foundation under the name GUILE. If you copy
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* code from other Free Software Foundation releases into a copy of
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* GUILE, as the General Public License permits, the exception does
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* not apply to the code that you add in this way. To avoid misleading
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* anyone as to the status of such modified files, you must delete
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* this exception notice from them.
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*
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* If you write modifications of your own for GUILE, it is your choice
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* whether to permit this exception to apply to your modifications.
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* If you do not wish that, delete this exception notice. */
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/* This file is included in vm_engine.c */
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/*
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* Basic operations
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*/
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/* This must be the first instruction! */
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VM_DEFINE_INSTRUCTION (nop, "nop", 0, 0, 0)
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{
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NEXT;
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}
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VM_DEFINE_INSTRUCTION (halt, "halt", 0, 0, 0)
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{
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SCM ret;
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vp->time += scm_c_get_internal_run_time () - start_time;
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HALT_HOOK ();
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nvalues = SCM_I_INUM (*sp--);
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if (nvalues == 1)
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POP (ret);
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else
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{
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POP_LIST (nvalues);
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POP (ret);
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ret = scm_values (ret);
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}
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{
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#ifdef THE_GOVERNMENT_IS_AFTER_ME
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if (sp != stack_base)
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abort ();
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if (stack_base != SCM_FRAME_UPPER_ADDRESS (fp) - 1)
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abort ();
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#endif
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/* Restore registers */
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sp = SCM_FRAME_LOWER_ADDRESS (fp) - 1;
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ip = NULL;
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fp = SCM_FRAME_DYNAMIC_LINK (fp);
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}
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SYNC_ALL ();
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scm_dynwind_end ();
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return ret;
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}
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VM_DEFINE_INSTRUCTION (break, "break", 0, 0, 0)
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{
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BREAK_HOOK ();
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NEXT;
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}
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VM_DEFINE_INSTRUCTION (drop, "drop", 0, 0, 0)
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{
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DROP ();
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NEXT;
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}
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VM_DEFINE_INSTRUCTION (mark, "mark", 0, 0, 1)
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{
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PUSH (SCM_UNDEFINED);
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NEXT;
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}
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VM_DEFINE_INSTRUCTION (dup, "dup", 0, 0, 1)
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{
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SCM x = *sp;
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PUSH (x);
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NEXT;
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}
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/*
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* Object creation
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*/
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VM_DEFINE_INSTRUCTION (void, "void", 0, 0, 1)
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{
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PUSH (SCM_UNSPECIFIED);
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NEXT;
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}
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VM_DEFINE_INSTRUCTION (make_true, "make-true", 0, 0, 1)
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{
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PUSH (SCM_BOOL_T);
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NEXT;
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}
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VM_DEFINE_INSTRUCTION (make_false, "make-false", 0, 0, 1)
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{
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PUSH (SCM_BOOL_F);
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NEXT;
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}
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VM_DEFINE_INSTRUCTION (make_eol, "make-eol", 0, 0, 1)
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{
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PUSH (SCM_EOL);
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NEXT;
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}
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VM_DEFINE_INSTRUCTION (make_int8, "make-int8", 1, 0, 1)
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{
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PUSH (SCM_I_MAKINUM ((signed char) FETCH ()));
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NEXT;
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}
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VM_DEFINE_INSTRUCTION (make_int8_0, "make-int8:0", 0, 0, 1)
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{
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PUSH (SCM_INUM0);
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NEXT;
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}
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VM_DEFINE_INSTRUCTION (make_int8_1, "make-int8:1", 0, 0, 1)
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{
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PUSH (SCM_I_MAKINUM (1));
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NEXT;
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}
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VM_DEFINE_INSTRUCTION (make_int16, "make-int16", 2, 0, 1)
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{
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int h = FETCH ();
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int l = FETCH ();
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PUSH (SCM_I_MAKINUM ((signed short) (h << 8) + l));
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NEXT;
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}
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VM_DEFINE_INSTRUCTION (make_char8, "make-char8", 1, 0, 1)
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{
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PUSH (SCM_MAKE_CHAR (FETCH ()));
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NEXT;
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}
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VM_DEFINE_INSTRUCTION (list, "list", 2, -1, 1)
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{
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unsigned h = FETCH ();
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unsigned l = FETCH ();
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unsigned len = ((h << 8) + l);
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POP_LIST (len);
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NEXT;
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}
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VM_DEFINE_INSTRUCTION (vector, "vector", 2, -1, 1)
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{
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unsigned h = FETCH ();
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unsigned l = FETCH ();
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unsigned len = ((h << 8) + l);
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POP_LIST (len);
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*sp = scm_vector (*sp);
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NEXT;
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}
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VM_DEFINE_INSTRUCTION (list_mark, "list-mark", 0, 0, 0)
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{
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POP_LIST_MARK ();
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NEXT;
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}
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VM_DEFINE_INSTRUCTION (vector_mark, "vector-mark", 0, 0, 0)
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{
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POP_LIST_MARK ();
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*sp = scm_vector (*sp);
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NEXT;
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}
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VM_DEFINE_INSTRUCTION (list_break, "list-break", 0, 0, 0)
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{
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SCM l;
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POP (l);
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for (; !SCM_NULLP (l); l = SCM_CDR (l))
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PUSH (SCM_CAR (l));
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NEXT;
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}
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/*
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* Variable access
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*/
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#define OBJECT_REF(i) objects[i]
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#define OBJECT_SET(i,o) objects[i] = o
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#define LOCAL_REF(i) SCM_FRAME_VARIABLE (fp, i)
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#define LOCAL_SET(i,o) SCM_FRAME_VARIABLE (fp, i) = o
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/* For the variable operations, we _must_ obviously avoid function calls to
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`scm_variable_ref ()', `scm_variable_bound_p ()' and friends which do
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nothing more than the corresponding macros. */
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#define VARIABLE_REF(v) SCM_VARIABLE_REF (v)
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#define VARIABLE_SET(v,o) SCM_VARIABLE_SET (v, o)
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#define VARIABLE_BOUNDP(v) (VARIABLE_REF (v) != SCM_UNDEFINED)
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/* ref */
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VM_DEFINE_INSTRUCTION (object_ref, "object-ref", 1, 0, 1)
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{
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register unsigned objnum = FETCH ();
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CHECK_OBJECT (objnum);
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PUSH (OBJECT_REF (objnum));
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NEXT;
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}
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VM_DEFINE_INSTRUCTION (local_ref, "local-ref", 1, 0, 1)
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{
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PUSH (LOCAL_REF (FETCH ()));
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NEXT;
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}
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VM_DEFINE_INSTRUCTION (external_ref, "external-ref", 1, 0, 1)
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{
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unsigned int i;
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SCM e = external;
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for (i = FETCH (); i; i--)
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{
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CHECK_EXTERNAL(e);
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e = SCM_CDR (e);
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}
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CHECK_EXTERNAL(e);
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PUSH (SCM_CAR (e));
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NEXT;
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}
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VM_DEFINE_INSTRUCTION (variable_ref, "variable-ref", 0, 0, 1)
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{
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SCM x = *sp;
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if (!VARIABLE_BOUNDP (x))
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{
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err_args = SCM_LIST1 (x);
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/* Was: err_args = SCM_LIST1 (SCM_CAR (x)); */
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goto vm_error_unbound;
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}
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else
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{
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SCM o = VARIABLE_REF (x);
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*sp = o;
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}
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NEXT;
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}
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VM_DEFINE_INSTRUCTION (late_variable_ref, "late-variable-ref", 1, 0, 1)
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{
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unsigned objnum = FETCH ();
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SCM sym_or_var;
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CHECK_OBJECT (objnum);
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sym_or_var = OBJECT_REF (objnum);
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if (!SCM_VARIABLEP (sym_or_var))
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{
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SYNC_REGISTER ();
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if (SCM_LIKELY (scm_module_system_booted_p && SCM_NFALSEP (bp->module)))
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{
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/* might longjmp */
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sym_or_var = scm_module_lookup (bp->module, sym_or_var);
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}
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else
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{
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sym_or_var = scm_sym2var (sym_or_var, SCM_BOOL_F, SCM_BOOL_F);
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}
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if (!VARIABLE_BOUNDP (sym_or_var))
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{
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err_args = SCM_LIST1 (sym_or_var);
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goto vm_error_unbound;
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}
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OBJECT_SET (objnum, sym_or_var);
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}
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PUSH (VARIABLE_REF (sym_or_var));
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NEXT;
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}
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/* set */
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VM_DEFINE_INSTRUCTION (local_set, "local-set", 1, 1, 0)
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{
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LOCAL_SET (FETCH (), *sp);
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DROP ();
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NEXT;
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}
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VM_DEFINE_INSTRUCTION (external_set, "external-set", 1, 1, 0)
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{
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unsigned int i;
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SCM e = external;
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for (i = FETCH (); i; i--)
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{
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CHECK_EXTERNAL(e);
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e = SCM_CDR (e);
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}
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CHECK_EXTERNAL(e);
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SCM_SETCAR (e, *sp);
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DROP ();
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NEXT;
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}
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VM_DEFINE_INSTRUCTION (variable_set, "variable-set", 0, 1, 0)
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{
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VARIABLE_SET (sp[0], sp[-1]);
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sp -= 2;
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NEXT;
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}
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VM_DEFINE_INSTRUCTION (late_variable_set, "late-variable-set", 1, 1, 0)
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{
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unsigned objnum = FETCH ();
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SCM sym_or_var;
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CHECK_OBJECT (objnum);
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sym_or_var = OBJECT_REF (objnum);
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if (!SCM_VARIABLEP (sym_or_var))
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{
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SYNC_BEFORE_GC ();
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if (SCM_LIKELY (scm_module_system_booted_p && SCM_NFALSEP (bp->module)))
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{
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/* might longjmp */
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sym_or_var = scm_module_lookup (bp->module, sym_or_var);
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}
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else
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{
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sym_or_var = scm_sym2var (sym_or_var, SCM_BOOL_F, SCM_BOOL_F);
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}
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OBJECT_SET (objnum, sym_or_var);
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}
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VARIABLE_SET (sym_or_var, *sp);
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DROP ();
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NEXT;
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}
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/*
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* branch and jump
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*/
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/* offset must be a signed short!!! */
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#define FETCH_OFFSET(offset) \
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{ \
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int h = FETCH (); \
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int l = FETCH (); \
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offset = (h << 8) + l; \
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}
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#define BR(p) \
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{ \
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signed short offset; \
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FETCH_OFFSET (offset); \
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if (p) \
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ip += offset; \
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DROP (); \
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NEXT; \
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}
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VM_DEFINE_INSTRUCTION (br, "br", 2, 0, 0)
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{
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int h = FETCH ();
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int l = FETCH ();
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ip += (signed short) (h << 8) + l;
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NEXT;
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}
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VM_DEFINE_INSTRUCTION (br_if, "br-if", 2, 0, 0)
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{
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BR (!SCM_FALSEP (*sp));
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}
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VM_DEFINE_INSTRUCTION (br_if_not, "br-if-not", 2, 0, 0)
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{
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BR (SCM_FALSEP (*sp));
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}
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VM_DEFINE_INSTRUCTION (br_if_eq, "br-if-eq", 2, 0, 0)
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{
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BR (SCM_EQ_P (sp[0], sp--[1]));
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}
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VM_DEFINE_INSTRUCTION (br_if_not_eq, "br-if-not-eq", 2, 0, 0)
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{
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BR (!SCM_EQ_P (sp[0], sp--[1]));
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}
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VM_DEFINE_INSTRUCTION (br_if_null, "br-if-null", 2, 0, 0)
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{
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BR (SCM_NULLP (*sp));
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}
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VM_DEFINE_INSTRUCTION (br_if_not_null, "br-if-not-null", 2, 0, 0)
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{
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BR (!SCM_NULLP (*sp));
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}
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/*
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* Subprogram call
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*/
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VM_DEFINE_INSTRUCTION (make_closure, "make-closure", 0, 1, 1)
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{
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SYNC_BEFORE_GC ();
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*sp = scm_c_make_closure (*sp, external);
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NEXT;
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}
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VM_DEFINE_INSTRUCTION (call, "call", 1, -1, 1)
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{
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SCM x;
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nargs = FETCH ();
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vm_call:
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x = sp[-nargs];
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/*
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* Subprogram call
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*/
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if (SCM_PROGRAM_P (x))
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{
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program = x;
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CACHE_PROGRAM ();
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INIT_ARGS ();
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NEW_FRAME ();
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ENTER_HOOK ();
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APPLY_HOOK ();
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NEXT;
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}
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#ifdef ENABLE_TRAMPOLINE
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/* Seems to slow down the fibo test, dunno why */
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/*
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* Subr call
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*/
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switch (nargs)
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{
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case 0:
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{
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scm_t_trampoline_0 call = scm_trampoline_0 (x);
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if (call)
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{
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SYNC_ALL ();
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*sp = call (x);
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NEXT;
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}
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break;
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}
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case 1:
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{
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scm_t_trampoline_1 call = scm_trampoline_1 (x);
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if (call)
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{
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SCM arg1;
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POP (arg1);
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SYNC_ALL ();
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*sp = call (x, arg1);
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NEXT;
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}
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break;
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}
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case 2:
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{
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scm_t_trampoline_2 call = scm_trampoline_2 (x);
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if (call)
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{
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SCM arg1, arg2;
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POP (arg2);
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POP (arg1);
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SYNC_ALL ();
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*sp = call (x, arg1, arg2);
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NEXT;
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}
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break;
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}
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}
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#endif
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/*
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||
* Other interpreted or compiled call
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||
*/
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||
if (!SCM_FALSEP (scm_procedure_p (x)))
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||
{
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/* At this point, the stack contains the procedure and each one of its
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arguments. */
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||
SCM args;
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POP_LIST (nargs);
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POP (args);
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SYNC_REGISTER ();
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*sp = scm_apply (x, args, SCM_EOL);
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NEXT;
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}
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/*
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* Continuation call
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*/
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if (SCM_VM_CONT_P (x))
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{
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program = x;
|
||
vm_call_continuation:
|
||
/* Check the number of arguments */
|
||
/* FIXME multiple args */
|
||
if (nargs != 1)
|
||
scm_wrong_num_args (program);
|
||
|
||
/* Reinstate the continuation */
|
||
EXIT_HOOK ();
|
||
reinstate_vm_cont (vp, program);
|
||
CACHE_REGISTER ();
|
||
program = SCM_FRAME_PROGRAM (fp);
|
||
CACHE_PROGRAM ();
|
||
NEXT;
|
||
}
|
||
|
||
program = x;
|
||
goto vm_error_wrong_type_apply;
|
||
}
|
||
|
||
VM_DEFINE_INSTRUCTION (goto_args, "goto/args", 1, -1, 1)
|
||
{
|
||
register SCM x;
|
||
nargs = FETCH ();
|
||
vm_goto_args:
|
||
x = sp[-nargs];
|
||
|
||
SCM_TICK; /* allow interrupt here */
|
||
|
||
/*
|
||
* Tail recursive call
|
||
*/
|
||
if (SCM_EQ_P (x, program))
|
||
{
|
||
int i;
|
||
|
||
/* Move arguments */
|
||
INIT_ARGS ();
|
||
sp -= bp->nargs - 1;
|
||
for (i = 0; i < bp->nargs; i++)
|
||
LOCAL_SET (i, sp[i]);
|
||
|
||
/* Drop the first argument and the program itself. */
|
||
sp -= 2;
|
||
|
||
/* Call itself */
|
||
ip = bp->base;
|
||
APPLY_HOOK ();
|
||
NEXT;
|
||
}
|
||
|
||
/*
|
||
* Tail call, but not to self -- reuse the frame, keeping the ra and dl
|
||
*/
|
||
if (SCM_PROGRAM_P (x))
|
||
{
|
||
SCM *data, *tail_args, *dl;
|
||
int i;
|
||
scm_byte_t *ra, *mvra;
|
||
|
||
EXIT_HOOK ();
|
||
|
||
/* save registers */
|
||
tail_args = stack_base + 2;
|
||
ra = SCM_FRAME_RETURN_ADDRESS (fp);
|
||
mvra = SCM_FRAME_MV_RETURN_ADDRESS (fp);
|
||
dl = SCM_FRAME_DYNAMIC_LINK (fp);
|
||
|
||
/* switch programs */
|
||
fp[-1] = program = x;
|
||
CACHE_PROGRAM ();
|
||
INIT_ARGS ();
|
||
nargs = bp->nargs;
|
||
|
||
/* new registers -- logically this would be better later, but let's make
|
||
sure we have space for the locals now */
|
||
data = SCM_FRAME_DATA_ADDRESS (fp);
|
||
ip = bp->base;
|
||
stack_base = data + 4;
|
||
sp = stack_base;
|
||
CHECK_OVERFLOW ();
|
||
|
||
/* copy args, bottom-up */
|
||
for (i = 0; i < nargs; i++)
|
||
fp[i] = tail_args[i];
|
||
|
||
/* init locals */
|
||
for (i = bp->nlocs; i; i--)
|
||
data[-i] = SCM_UNDEFINED;
|
||
|
||
/* and the external variables */
|
||
external = bp->external;
|
||
for (i = 0; i < bp->nexts; i++)
|
||
CONS (external, SCM_UNDEFINED, external);
|
||
|
||
/* Set frame data */
|
||
data[4] = (SCM)ra;
|
||
data[3] = (SCM)mvra;
|
||
data[2] = (SCM)dl;
|
||
data[1] = SCM_BOOL_F;
|
||
data[0] = external;
|
||
ENTER_HOOK ();
|
||
APPLY_HOOK ();
|
||
NEXT;
|
||
}
|
||
#ifdef ENABLE_TRAMPOLINE
|
||
/* This seems to actually slow down the fibo test -- dunno why */
|
||
/*
|
||
* Subr call
|
||
*/
|
||
switch (nargs)
|
||
{
|
||
case 0:
|
||
{
|
||
scm_t_trampoline_0 call = scm_trampoline_0 (x);
|
||
if (call)
|
||
{
|
||
SYNC_ALL ();
|
||
*sp = call (x);
|
||
goto vm_return;
|
||
}
|
||
break;
|
||
}
|
||
case 1:
|
||
{
|
||
scm_t_trampoline_1 call = scm_trampoline_1 (x);
|
||
if (call)
|
||
{
|
||
SCM arg1;
|
||
POP (arg1);
|
||
SYNC_ALL ();
|
||
*sp = call (x, arg1);
|
||
goto vm_return;
|
||
}
|
||
break;
|
||
}
|
||
case 2:
|
||
{
|
||
scm_t_trampoline_2 call = scm_trampoline_2 (x);
|
||
if (call)
|
||
{
|
||
SCM arg1, arg2;
|
||
POP (arg2);
|
||
POP (arg1);
|
||
SYNC_ALL ();
|
||
*sp = call (x, arg1, arg2);
|
||
goto vm_return;
|
||
}
|
||
break;
|
||
}
|
||
}
|
||
#endif
|
||
|
||
/*
|
||
* Other interpreted or compiled call
|
||
*/
|
||
if (!SCM_FALSEP (scm_procedure_p (x)))
|
||
{
|
||
SCM args;
|
||
POP_LIST (nargs);
|
||
POP (args);
|
||
SYNC_REGISTER ();
|
||
*sp = scm_apply (x, args, SCM_EOL);
|
||
goto vm_return;
|
||
}
|
||
|
||
program = x;
|
||
|
||
/*
|
||
* Continuation call
|
||
*/
|
||
if (SCM_VM_CONT_P (program))
|
||
goto vm_call_continuation;
|
||
|
||
goto vm_error_wrong_type_apply;
|
||
}
|
||
|
||
VM_DEFINE_INSTRUCTION (goto_nargs, "goto/nargs", 0, 0, 1)
|
||
{
|
||
SCM x;
|
||
POP (x);
|
||
nargs = scm_to_int (x);
|
||
/* FIXME: should truncate values? */
|
||
goto vm_goto_args;
|
||
}
|
||
|
||
VM_DEFINE_INSTRUCTION (call_nargs, "call/nargs", 0, 0, 1)
|
||
{
|
||
SCM x;
|
||
POP (x);
|
||
nargs = scm_to_int (x);
|
||
/* FIXME: should truncate values? */
|
||
goto vm_call;
|
||
}
|
||
|
||
VM_DEFINE_INSTRUCTION (mv_call, "mv-call", 3, -1, 1)
|
||
{
|
||
SCM x;
|
||
signed short offset;
|
||
|
||
nargs = FETCH ();
|
||
FETCH_OFFSET (offset);
|
||
|
||
x = sp[-nargs];
|
||
|
||
/*
|
||
* Subprogram call
|
||
*/
|
||
if (SCM_PROGRAM_P (x))
|
||
{
|
||
program = x;
|
||
CACHE_PROGRAM ();
|
||
INIT_ARGS ();
|
||
NEW_FRAME ();
|
||
SCM_FRAME_DATA_ADDRESS (fp)[3] = (SCM)(SCM_FRAME_RETURN_ADDRESS (fp) + offset);
|
||
ENTER_HOOK ();
|
||
APPLY_HOOK ();
|
||
NEXT;
|
||
}
|
||
/*
|
||
* Other interpreted or compiled call
|
||
*/
|
||
if (!SCM_FALSEP (scm_procedure_p (x)))
|
||
{
|
||
/* At this point, the stack contains the procedure and each one of its
|
||
arguments. */
|
||
SCM args;
|
||
POP_LIST (nargs);
|
||
POP (args);
|
||
SYNC_REGISTER ();
|
||
*sp = scm_apply (x, args, SCM_EOL);
|
||
if (SCM_VALUESP (*sp))
|
||
{
|
||
SCM values, len;
|
||
POP (values);
|
||
values = scm_struct_ref (values, SCM_INUM0);
|
||
len = scm_length (values);
|
||
while (!SCM_NULLP (values))
|
||
PUSH (SCM_CAR (values));
|
||
PUSH (len);
|
||
ip += offset;
|
||
}
|
||
NEXT;
|
||
}
|
||
/*
|
||
* Continuation call
|
||
*/
|
||
if (SCM_VM_CONT_P (x))
|
||
{
|
||
program = x;
|
||
goto vm_call_continuation;
|
||
}
|
||
|
||
program = x;
|
||
goto vm_error_wrong_type_apply;
|
||
}
|
||
|
||
VM_DEFINE_INSTRUCTION (apply, "apply", 1, -1, 1)
|
||
{
|
||
int len;
|
||
SCM ls;
|
||
POP (ls);
|
||
|
||
nargs = FETCH ();
|
||
if (nargs < 2)
|
||
goto vm_error_wrong_num_args;
|
||
|
||
len = scm_ilength (ls);
|
||
if (len < 0)
|
||
goto vm_error_wrong_type_arg;
|
||
|
||
for (; !SCM_NULLP (ls); ls = SCM_CDR (ls))
|
||
PUSH (SCM_CAR (ls));
|
||
|
||
nargs += len - 2;
|
||
goto vm_call;
|
||
}
|
||
|
||
VM_DEFINE_INSTRUCTION (goto_apply, "goto/apply", 1, -1, 1)
|
||
{
|
||
int len;
|
||
SCM ls;
|
||
POP (ls);
|
||
|
||
nargs = FETCH ();
|
||
if (nargs < 2)
|
||
goto vm_error_wrong_num_args;
|
||
|
||
len = scm_ilength (ls);
|
||
if (len < 0)
|
||
goto vm_error_wrong_type_arg;
|
||
|
||
for (; !SCM_NULLP (ls); ls = SCM_CDR (ls))
|
||
PUSH (SCM_CAR (ls));
|
||
|
||
nargs += len - 2;
|
||
goto vm_goto_args;
|
||
}
|
||
|
||
VM_DEFINE_INSTRUCTION (call_cc, "call/cc", 1, 1, 1)
|
||
{
|
||
SYNC_BEFORE_GC ();
|
||
PUSH (capture_vm_cont (vp));
|
||
nargs = 1;
|
||
goto vm_call;
|
||
}
|
||
|
||
VM_DEFINE_INSTRUCTION (goto_cc, "goto/cc", 1, 1, 1)
|
||
{
|
||
SYNC_BEFORE_GC ();
|
||
PUSH (capture_vm_cont (vp));
|
||
nargs = 1;
|
||
goto vm_goto_args;
|
||
}
|
||
|
||
VM_DEFINE_INSTRUCTION (return, "return", 0, 0, 1)
|
||
{
|
||
vm_return:
|
||
EXIT_HOOK ();
|
||
RETURN_HOOK ();
|
||
{
|
||
SCM ret, *data;
|
||
data = SCM_FRAME_DATA_ADDRESS (fp);
|
||
|
||
POP (ret);
|
||
#ifdef THE_GOVERNMENT_IS_AFTER_ME
|
||
if (sp != stack_base)
|
||
abort ();
|
||
if (stack_base != data + 4)
|
||
abort ();
|
||
#endif
|
||
|
||
/* Restore registers */
|
||
sp = SCM_FRAME_LOWER_ADDRESS (fp);
|
||
ip = SCM_FRAME_BYTE_CAST (data[4]);
|
||
fp = SCM_FRAME_STACK_CAST (data[2]);
|
||
stack_base = SCM_FRAME_UPPER_ADDRESS (fp) - 1;
|
||
|
||
/* Set return value (sp is already pushed) */
|
||
*sp = ret;
|
||
}
|
||
|
||
/* Restore the last program */
|
||
program = SCM_FRAME_PROGRAM (fp);
|
||
CACHE_PROGRAM ();
|
||
CACHE_EXTERNAL ();
|
||
CHECK_IP ();
|
||
NEXT;
|
||
}
|
||
|
||
VM_DEFINE_INSTRUCTION (return_values, "return/values", 1, -1, -1)
|
||
{
|
||
/* nvalues declared at top level, because for some reason gcc seems to think
|
||
that perhaps it might be used without declaration. Fooey to that, I say. */
|
||
SCM *data;
|
||
|
||
nvalues = FETCH ();
|
||
vm_return_values:
|
||
EXIT_HOOK ();
|
||
RETURN_HOOK ();
|
||
|
||
data = SCM_FRAME_DATA_ADDRESS (fp);
|
||
#ifdef THE_GOVERNMENT_IS_AFTER_ME
|
||
if (stack_base != data + 4)
|
||
abort ();
|
||
#endif
|
||
|
||
/* data[3] is the mv return address */
|
||
if (nvalues != 1 && data[3])
|
||
{
|
||
int i;
|
||
/* Restore registers */
|
||
sp = SCM_FRAME_LOWER_ADDRESS (fp) - 1;
|
||
ip = SCM_FRAME_BYTE_CAST (data[3]); /* multiple value ra */
|
||
fp = SCM_FRAME_STACK_CAST (data[2]);
|
||
|
||
/* Push return values, and the number of values */
|
||
for (i = 0; i < nvalues; i++)
|
||
*++sp = stack_base[1+i];
|
||
*++sp = SCM_I_MAKINUM (nvalues);
|
||
|
||
/* Finally set new stack_base */
|
||
stack_base = SCM_FRAME_UPPER_ADDRESS (fp) - 1;
|
||
}
|
||
else if (nvalues >= 1)
|
||
{
|
||
/* Multiple values for a single-valued continuation -- here's where I
|
||
break with guile tradition and try and do something sensible. (Also,
|
||
this block handles the single-valued return to an mv
|
||
continuation.) */
|
||
/* Restore registers */
|
||
sp = SCM_FRAME_LOWER_ADDRESS (fp) - 1;
|
||
ip = SCM_FRAME_BYTE_CAST (data[4]); /* single value ra */
|
||
fp = SCM_FRAME_STACK_CAST (data[2]);
|
||
|
||
/* Push first value */
|
||
*++sp = stack_base[1];
|
||
|
||
/* Finally set new stack_base */
|
||
stack_base = SCM_FRAME_UPPER_ADDRESS (fp) - 1;
|
||
}
|
||
else
|
||
goto vm_error_no_values;
|
||
|
||
/* Restore the last program */
|
||
program = SCM_FRAME_PROGRAM (fp);
|
||
CACHE_PROGRAM ();
|
||
CACHE_EXTERNAL ();
|
||
CHECK_IP ();
|
||
NEXT;
|
||
}
|
||
|
||
VM_DEFINE_INSTRUCTION (return_values_star, "return/values*", 1, -1, -1)
|
||
{
|
||
SCM l;
|
||
|
||
nvalues = FETCH ();
|
||
#ifdef THE_GOVERNMENT_IS_AFTER_ME
|
||
if (nvalues < 1)
|
||
abort ();
|
||
#endif
|
||
|
||
nvalues--;
|
||
POP (l);
|
||
while (SCM_CONSP (l))
|
||
{
|
||
PUSH (SCM_CAR (l));
|
||
l = SCM_CDR (l);
|
||
nvalues++;
|
||
}
|
||
|
||
goto vm_return_values;
|
||
}
|
||
|
||
VM_DEFINE_INSTRUCTION (truncate_values, "truncate-values", 2, -1, -1)
|
||
{
|
||
SCM x;
|
||
int nbinds, rest;
|
||
POP (x);
|
||
nvalues = scm_to_int (x);
|
||
nbinds = FETCH ();
|
||
rest = FETCH ();
|
||
|
||
if (rest)
|
||
nbinds--;
|
||
|
||
if (nvalues < nbinds)
|
||
goto vm_error_not_enough_values;
|
||
|
||
if (rest)
|
||
POP_LIST (nvalues - nbinds);
|
||
else
|
||
DROPN (nvalues - nbinds);
|
||
|
||
NEXT;
|
||
}
|
||
|
||
/*
|
||
Local Variables:
|
||
c-file-style: "gnu"
|
||
End:
|
||
*/
|