diff options
Diffstat (limited to 'libguile/vm-i-system.c')
| -rw-r--r-- | libguile/vm-i-system.c | 1106 |
1 files changed, 1106 insertions, 0 deletions
diff --git a/libguile/vm-i-system.c b/libguile/vm-i-system.c new file mode 100644 index 000000000..0662f8188 --- /dev/null +++ b/libguile/vm-i-system.c @@ -0,0 +1,1106 @@ +/* Copyright (C) 2001,2008,2009 Free Software Foundation, Inc. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public License + * as published by the Free Software Foundation; either version 3 of + * the License, or (at your option) any later version. + * + * This library 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301 USA + */ + + +/* This file is included in vm_engine.c */ + + +/* + * Basic operations + */ + +VM_DEFINE_INSTRUCTION (0, nop, "nop", 0, 0, 0) +{ + NEXT; +} + +VM_DEFINE_INSTRUCTION (1, halt, "halt", 0, 0, 0) +{ + vp->time += scm_c_get_internal_run_time () - start_time; + HALT_HOOK (); + nvalues = SCM_I_INUM (*sp--); + NULLSTACK (1); + if (nvalues == 1) + POP (finish_args); + else + { + POP_LIST (nvalues); + POP (finish_args); + SYNC_REGISTER (); + finish_args = scm_values (finish_args); + } + + { + ASSERT (sp == stack_base); + ASSERT (stack_base == SCM_FRAME_UPPER_ADDRESS (fp) - 1); + + /* Restore registers */ + sp = SCM_FRAME_LOWER_ADDRESS (fp) - 1; + ip = NULL; + fp = SCM_FRAME_DYNAMIC_LINK (fp); + NULLSTACK (stack_base - sp); + } + + goto vm_done; +} + +VM_DEFINE_INSTRUCTION (2, break, "break", 0, 0, 0) +{ + BREAK_HOOK (); + NEXT; +} + +VM_DEFINE_INSTRUCTION (3, drop, "drop", 0, 1, 0) +{ + DROP (); + NEXT; +} + +VM_DEFINE_INSTRUCTION (4, dup, "dup", 0, 0, 1) +{ + SCM x = *sp; + PUSH (x); + NEXT; +} + + +/* + * Object creation + */ + +VM_DEFINE_INSTRUCTION (5, void, "void", 0, 0, 1) +{ + PUSH (SCM_UNSPECIFIED); + NEXT; +} + +VM_DEFINE_INSTRUCTION (6, make_true, "make-true", 0, 0, 1) +{ + PUSH (SCM_BOOL_T); + NEXT; +} + +VM_DEFINE_INSTRUCTION (7, make_false, "make-false", 0, 0, 1) +{ + PUSH (SCM_BOOL_F); + NEXT; +} + +VM_DEFINE_INSTRUCTION (8, make_eol, "make-eol", 0, 0, 1) +{ + PUSH (SCM_EOL); + NEXT; +} + +VM_DEFINE_INSTRUCTION (9, make_int8, "make-int8", 1, 0, 1) +{ + PUSH (SCM_I_MAKINUM ((signed char) FETCH ())); + NEXT; +} + +VM_DEFINE_INSTRUCTION (10, make_int8_0, "make-int8:0", 0, 0, 1) +{ + PUSH (SCM_INUM0); + NEXT; +} + +VM_DEFINE_INSTRUCTION (11, make_int8_1, "make-int8:1", 0, 0, 1) +{ + PUSH (SCM_I_MAKINUM (1)); + NEXT; +} + +VM_DEFINE_INSTRUCTION (12, make_int16, "make-int16", 2, 0, 1) +{ + int h = FETCH (); + int l = FETCH (); + PUSH (SCM_I_MAKINUM ((signed short) (h << 8) + l)); + NEXT; +} + +VM_DEFINE_INSTRUCTION (13, make_int64, "make-int64", 8, 0, 1) +{ + scm_t_uint64 v = 0; + v += FETCH (); + v <<= 8; v += FETCH (); + v <<= 8; v += FETCH (); + v <<= 8; v += FETCH (); + v <<= 8; v += FETCH (); + v <<= 8; v += FETCH (); + v <<= 8; v += FETCH (); + v <<= 8; v += FETCH (); + PUSH (scm_from_int64 ((scm_t_int64) v)); + NEXT; +} + +VM_DEFINE_INSTRUCTION (14, make_uint64, "make-uint64", 8, 0, 1) +{ + scm_t_uint64 v = 0; + v += FETCH (); + v <<= 8; v += FETCH (); + v <<= 8; v += FETCH (); + v <<= 8; v += FETCH (); + v <<= 8; v += FETCH (); + v <<= 8; v += FETCH (); + v <<= 8; v += FETCH (); + v <<= 8; v += FETCH (); + PUSH (scm_from_uint64 (v)); + NEXT; +} + +VM_DEFINE_INSTRUCTION (15, make_char8, "make-char8", 1, 0, 1) +{ + scm_t_uint8 v = 0; + v = FETCH (); + + PUSH (SCM_MAKE_CHAR (v)); + /* Don't simplify this to PUSH (SCM_MAKE_CHAR (FETCH ())). The + contents of SCM_MAKE_CHAR may be evaluated more than once, + resulting in a double fetch. */ + NEXT; +} + +VM_DEFINE_INSTRUCTION (16, make_char32, "make-char32", 4, 0, 1) +{ + scm_t_wchar v = 0; + v += FETCH (); + v <<= 8; v += FETCH (); + v <<= 8; v += FETCH (); + v <<= 8; v += FETCH (); + PUSH (SCM_MAKE_CHAR (v)); + NEXT; +} + + + +VM_DEFINE_INSTRUCTION (17, list, "list", 2, -1, 1) +{ + unsigned h = FETCH (); + unsigned l = FETCH (); + unsigned len = ((h << 8) + l); + POP_LIST (len); + NEXT; +} + +VM_DEFINE_INSTRUCTION (18, vector, "vector", 2, -1, 1) +{ + unsigned h = FETCH (); + unsigned l = FETCH (); + unsigned len = ((h << 8) + l); + SCM vect; + + SYNC_REGISTER (); + sp++; sp -= len; + CHECK_UNDERFLOW (); + vect = scm_make_vector (scm_from_uint (len), SCM_BOOL_F); + memcpy (SCM_I_VECTOR_WELTS(vect), sp, sizeof(SCM) * len); + NULLSTACK (len); + *sp = vect; + + NEXT; +} + + +/* + * Variable access + */ + +#define OBJECT_REF(i) objects[i] +#define OBJECT_SET(i,o) objects[i] = o + +#define LOCAL_REF(i) SCM_FRAME_VARIABLE (fp, i) +#define LOCAL_SET(i,o) SCM_FRAME_VARIABLE (fp, i) = o + +/* For the variable operations, we _must_ obviously avoid function calls to + `scm_variable_ref ()', `scm_variable_bound_p ()' and friends which do + nothing more than the corresponding macros. */ +#define VARIABLE_REF(v) SCM_VARIABLE_REF (v) +#define VARIABLE_SET(v,o) SCM_VARIABLE_SET (v, o) +#define VARIABLE_BOUNDP(v) (VARIABLE_REF (v) != SCM_UNDEFINED) + +#define FREE_VARIABLE_REF(i) free_vars[i] + +/* ref */ + +VM_DEFINE_INSTRUCTION (19, object_ref, "object-ref", 1, 0, 1) +{ + register unsigned objnum = FETCH (); + CHECK_OBJECT (objnum); + PUSH (OBJECT_REF (objnum)); + NEXT; +} + +/* FIXME: necessary? elt 255 of the vector could be a vector... */ +VM_DEFINE_INSTRUCTION (20, long_object_ref, "long-object-ref", 2, 0, 1) +{ + unsigned int objnum = FETCH (); + objnum <<= 8; + objnum += FETCH (); + CHECK_OBJECT (objnum); + PUSH (OBJECT_REF (objnum)); + NEXT; +} + +VM_DEFINE_INSTRUCTION (21, local_ref, "local-ref", 1, 0, 1) +{ + PUSH (LOCAL_REF (FETCH ())); + ASSERT_BOUND (*sp); + NEXT; +} + +VM_DEFINE_INSTRUCTION (22, long_local_ref, "long-local-ref", 2, 0, 1) +{ + unsigned int i = FETCH (); + i <<= 8; + i += FETCH (); + PUSH (LOCAL_REF (i)); + ASSERT_BOUND (*sp); + NEXT; +} + +VM_DEFINE_INSTRUCTION (23, variable_ref, "variable-ref", 0, 0, 1) +{ + SCM x = *sp; + + if (!VARIABLE_BOUNDP (x)) + { + finish_args = scm_list_1 (x); + /* Was: finish_args = SCM_LIST1 (SCM_CAR (x)); */ + goto vm_error_unbound; + } + else + { + SCM o = VARIABLE_REF (x); + *sp = o; + } + + NEXT; +} + +VM_DEFINE_INSTRUCTION (24, toplevel_ref, "toplevel-ref", 1, 0, 1) +{ + unsigned objnum = FETCH (); + SCM what; + CHECK_OBJECT (objnum); + what = OBJECT_REF (objnum); + + if (!SCM_VARIABLEP (what)) + { + SYNC_REGISTER (); + what = resolve_variable (what, scm_program_module (program)); + if (!VARIABLE_BOUNDP (what)) + { + finish_args = scm_list_1 (what); + goto vm_error_unbound; + } + OBJECT_SET (objnum, what); + } + + PUSH (VARIABLE_REF (what)); + NEXT; +} + +VM_DEFINE_INSTRUCTION (25, long_toplevel_ref, "long-toplevel-ref", 2, 0, 1) +{ + SCM what; + unsigned int objnum = FETCH (); + objnum <<= 8; + objnum += FETCH (); + CHECK_OBJECT (objnum); + what = OBJECT_REF (objnum); + + if (!SCM_VARIABLEP (what)) + { + SYNC_REGISTER (); + what = resolve_variable (what, scm_program_module (program)); + if (!VARIABLE_BOUNDP (what)) + { + finish_args = scm_list_1 (what); + goto vm_error_unbound; + } + OBJECT_SET (objnum, what); + } + + PUSH (VARIABLE_REF (what)); + NEXT; +} + +/* set */ + +VM_DEFINE_INSTRUCTION (26, local_set, "local-set", 1, 1, 0) +{ + LOCAL_SET (FETCH (), *sp); + DROP (); + NEXT; +} + +VM_DEFINE_INSTRUCTION (27, long_local_set, "long-local-set", 2, 1, 0) +{ + unsigned int i = FETCH (); + i <<= 8; + i += FETCH (); + LOCAL_SET (i, *sp); + DROP (); + NEXT; +} + +VM_DEFINE_INSTRUCTION (28, variable_set, "variable-set", 0, 1, 0) +{ + VARIABLE_SET (sp[0], sp[-1]); + DROPN (2); + NEXT; +} + +VM_DEFINE_INSTRUCTION (29, toplevel_set, "toplevel-set", 1, 1, 0) +{ + unsigned objnum = FETCH (); + SCM what; + CHECK_OBJECT (objnum); + what = OBJECT_REF (objnum); + + if (!SCM_VARIABLEP (what)) + { + SYNC_BEFORE_GC (); + what = resolve_variable (what, scm_program_module (program)); + OBJECT_SET (objnum, what); + } + + VARIABLE_SET (what, *sp); + DROP (); + NEXT; +} + +VM_DEFINE_INSTRUCTION (30, long_toplevel_set, "long-toplevel-set", 2, 1, 0) +{ + SCM what; + unsigned int objnum = FETCH (); + objnum <<= 8; + objnum += FETCH (); + CHECK_OBJECT (objnum); + what = OBJECT_REF (objnum); + + if (!SCM_VARIABLEP (what)) + { + SYNC_BEFORE_GC (); + what = resolve_variable (what, scm_program_module (program)); + OBJECT_SET (objnum, what); + } + + VARIABLE_SET (what, *sp); + DROP (); + NEXT; +} + + +/* + * branch and jump + */ + +/* offset must be a signed 16 bit int!!! */ +#define FETCH_OFFSET(offset) \ +{ \ + int h = FETCH (); \ + int l = FETCH (); \ + offset = (h << 8) + l; \ +} + +#define BR(p) \ +{ \ + scm_t_int16 offset; \ + FETCH_OFFSET (offset); \ + if (p) \ + ip += ((scm_t_ptrdiff)offset) * 8 - (((unsigned long)ip) % 8); \ + NULLSTACK (1); \ + DROP (); \ + NEXT; \ +} + +VM_DEFINE_INSTRUCTION (31, br, "br", 2, 0, 0) +{ + scm_t_int16 offset; + FETCH_OFFSET (offset); + ip += ((scm_t_ptrdiff)offset) * 8 - (((unsigned long)ip) % 8); + NEXT; +} + +VM_DEFINE_INSTRUCTION (32, br_if, "br-if", 2, 0, 0) +{ + BR (!SCM_FALSEP (*sp)); +} + +VM_DEFINE_INSTRUCTION (33, br_if_not, "br-if-not", 2, 0, 0) +{ + BR (SCM_FALSEP (*sp)); +} + +VM_DEFINE_INSTRUCTION (34, br_if_eq, "br-if-eq", 2, 0, 0) +{ + sp--; /* underflow? */ + BR (SCM_EQ_P (sp[0], sp[1])); +} + +VM_DEFINE_INSTRUCTION (35, br_if_not_eq, "br-if-not-eq", 2, 0, 0) +{ + sp--; /* underflow? */ + BR (!SCM_EQ_P (sp[0], sp[1])); +} + +VM_DEFINE_INSTRUCTION (36, br_if_null, "br-if-null", 2, 0, 0) +{ + BR (SCM_NULLP (*sp)); +} + +VM_DEFINE_INSTRUCTION (37, br_if_not_null, "br-if-not-null", 2, 0, 0) +{ + BR (!SCM_NULLP (*sp)); +} + + +/* + * Subprogram call + */ + +VM_DEFINE_INSTRUCTION (38, new_frame, "new-frame", 0, 0, 3) +{ + PUSH ((SCM)fp); /* dynamic link */ + PUSH (0); /* mvra */ + PUSH (0); /* ra */ + NEXT; +} + +VM_DEFINE_INSTRUCTION (39, call, "call", 1, -1, 1) +{ + SCM x; + nargs = FETCH (); + + vm_call: + x = sp[-nargs]; + + SYNC_REGISTER (); + SCM_TICK; /* allow interrupt here */ + + /* + * Subprogram call + */ + if (SCM_PROGRAM_P (x)) + { + program = x; + CACHE_PROGRAM (); + INIT_ARGS (); + fp = sp - bp->nargs + 1; + ASSERT (SCM_FRAME_RETURN_ADDRESS (fp) == 0); + ASSERT (SCM_FRAME_MV_RETURN_ADDRESS (fp) == 0); + SCM_FRAME_SET_RETURN_ADDRESS (fp, ip); + SCM_FRAME_SET_MV_RETURN_ADDRESS (fp, 0); + INIT_FRAME (); + ENTER_HOOK (); + APPLY_HOOK (); + NEXT; + } + /* + * Other interpreted or compiled call + */ + if (!SCM_FALSEP (scm_procedure_p (x))) + { + SCM args; + /* At this point, the stack contains the frame, the procedure and each one + of its arguments. */ + POP_LIST (nargs); + POP (args); + DROP (); /* drop the procedure */ + DROP_FRAME (); + + SYNC_REGISTER (); + PUSH (scm_apply (x, args, SCM_EOL)); + NULLSTACK_FOR_NONLOCAL_EXIT (); + if (SCM_UNLIKELY (SCM_VALUESP (*sp))) + { + /* truncate values */ + SCM values; + POP (values); + values = scm_struct_ref (values, SCM_INUM0); + if (scm_is_null (values)) + goto vm_error_not_enough_values; + PUSH (SCM_CAR (values)); + } + NEXT; + } + + program = x; + goto vm_error_wrong_type_apply; +} + +VM_DEFINE_INSTRUCTION (40, goto_args, "goto/args", 1, -1, 1) +{ + register SCM x; + nargs = FETCH (); + vm_goto_args: + x = sp[-nargs]; + + SYNC_REGISTER (); + SCM_TICK; /* allow interrupt here */ + + /* + * Tail call + */ + if (SCM_PROGRAM_P (x)) + { + int i; +#ifdef VM_ENABLE_STACK_NULLING + SCM *old_sp; +#endif + + EXIT_HOOK (); + + /* switch programs */ + program = x; + CACHE_PROGRAM (); + INIT_ARGS (); + +#ifdef VM_ENABLE_STACK_NULLING + old_sp = sp; + CHECK_STACK_LEAK (); +#endif + + /* delay shuffling the new program+args down so that if INIT_ARGS had to + cons up a rest arg, going into GC, the stack still made sense */ + for (i = -1, sp = sp - bp->nargs + 1; i < bp->nargs; i++) + fp[i] = sp[i]; + sp = fp + i - 1; + + NULLSTACK (old_sp - sp); + + INIT_FRAME (); + + ENTER_HOOK (); + APPLY_HOOK (); + NEXT; + } + + /* + * 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); + NULLSTACK_FOR_NONLOCAL_EXIT (); + + if (SCM_UNLIKELY (SCM_VALUESP (*sp))) + { + /* multiple values returned to continuation */ + SCM values; + POP (values); + values = scm_struct_ref (values, SCM_INUM0); + nvalues = scm_ilength (values); + PUSH_LIST (values, SCM_NULLP); + goto vm_return_values; + } + else + goto vm_return; + } + + program = x; + + goto vm_error_wrong_type_apply; +} + +VM_DEFINE_INSTRUCTION (41, 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 (42, 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 (43, mv_call, "mv-call", 3, -1, 1) +{ + SCM x; + scm_t_int16 offset; + scm_t_uint8 *mvra; + + nargs = FETCH (); + FETCH_OFFSET (offset); + mvra = ip + ((scm_t_ptrdiff)offset) * 8 - ((unsigned long)ip) % 8; + + x = sp[-nargs]; + + /* + * Subprogram call + */ + if (SCM_PROGRAM_P (x)) + { + program = x; + CACHE_PROGRAM (); + INIT_ARGS (); + fp = sp - bp->nargs + 1; + ASSERT (SCM_FRAME_RETURN_ADDRESS (fp) == 0); + ASSERT (SCM_FRAME_MV_RETURN_ADDRESS (fp) == 0); + SCM_FRAME_SET_RETURN_ADDRESS (fp, ip); + SCM_FRAME_SET_MV_RETURN_ADDRESS (fp, mvra); + INIT_FRAME (); + ENTER_HOOK (); + APPLY_HOOK (); + NEXT; + } + /* + * Other interpreted or compiled call + */ + if (!SCM_FALSEP (scm_procedure_p (x))) + { + SCM args; + /* At this point, the stack contains the procedure and each one of its + arguments. */ + POP_LIST (nargs); + POP (args); + DROP (); /* drop the procedure */ + DROP_FRAME (); + + SYNC_REGISTER (); + PUSH (scm_apply (x, args, SCM_EOL)); + NULLSTACK_FOR_NONLOCAL_EXIT (); + if (SCM_VALUESP (*sp)) + { + SCM values, len; + POP (values); + values = scm_struct_ref (values, SCM_INUM0); + len = scm_length (values); + PUSH_LIST (values, SCM_NULLP); + PUSH (len); + ip = mvra; + } + NEXT; + } + + program = x; + goto vm_error_wrong_type_apply; +} + +VM_DEFINE_INSTRUCTION (44, apply, "apply", 1, -1, 1) +{ + int len; + SCM ls; + POP (ls); + + nargs = FETCH (); + ASSERT (nargs >= 2); + + len = scm_ilength (ls); + if (len < 0) + goto vm_error_wrong_type_arg; + + PUSH_LIST (ls, SCM_NULL_OR_NIL_P); + + nargs += len - 2; + goto vm_call; +} + +VM_DEFINE_INSTRUCTION (45, goto_apply, "goto/apply", 1, -1, 1) +{ + int len; + SCM ls; + POP (ls); + + nargs = FETCH (); + ASSERT (nargs >= 2); + + len = scm_ilength (ls); + if (len < 0) + goto vm_error_wrong_type_arg; + + PUSH_LIST (ls, SCM_NULL_OR_NIL_P); + + nargs += len - 2; + goto vm_goto_args; +} + +VM_DEFINE_INSTRUCTION (46, call_cc, "call/cc", 0, 1, 1) +{ + int first; + SCM proc, cont; + POP (proc); + SYNC_ALL (); + cont = scm_make_continuation (&first); + if (first) + { + PUSH ((SCM)fp); /* dynamic link */ + PUSH (0); /* mvra */ + PUSH (0); /* ra */ + PUSH (proc); + PUSH (cont); + nargs = 1; + goto vm_call; + } + ASSERT (sp == vp->sp); + ASSERT (fp == vp->fp); + else if (SCM_VALUESP (cont)) + { + /* multiple values returned to continuation */ + SCM values; + values = scm_struct_ref (cont, SCM_INUM0); + if (SCM_NULLP (values)) + goto vm_error_no_values; + /* non-tail context does not accept multiple values? */ + PUSH (SCM_CAR (values)); + NEXT; + } + else + { + PUSH (cont); + NEXT; + } +} + +VM_DEFINE_INSTRUCTION (47, goto_cc, "goto/cc", 0, 1, 1) +{ + int first; + SCM proc, cont; + POP (proc); + SYNC_ALL (); + cont = scm_make_continuation (&first); + ASSERT (sp == vp->sp); + ASSERT (fp == vp->fp); + if (first) + { + PUSH (proc); + PUSH (cont); + nargs = 1; + goto vm_goto_args; + } + else if (SCM_VALUESP (cont)) + { + /* multiple values returned to continuation */ + SCM values; + values = scm_struct_ref (cont, SCM_INUM0); + nvalues = scm_ilength (values); + PUSH_LIST (values, SCM_NULLP); + goto vm_return_values; + } + else + { + PUSH (cont); + goto vm_return; + } +} + +VM_DEFINE_INSTRUCTION (48, return, "return", 0, 1, 1) +{ + vm_return: + EXIT_HOOK (); + RETURN_HOOK (); + SYNC_REGISTER (); + SCM_TICK; /* allow interrupt here */ + { + SCM ret; + + POP (ret); + ASSERT (sp == stack_base); + ASSERT (stack_base == SCM_FRAME_UPPER_ADDRESS (fp) - 1); + + /* Restore registers */ + sp = SCM_FRAME_LOWER_ADDRESS (fp); + ip = SCM_FRAME_RETURN_ADDRESS (fp); + fp = SCM_FRAME_DYNAMIC_LINK (fp); + { +#ifdef VM_ENABLE_STACK_NULLING + int nullcount = stack_base - sp; +#endif + stack_base = SCM_FRAME_UPPER_ADDRESS (fp) - 1; + NULLSTACK (nullcount); + } + + /* Set return value (sp is already pushed) */ + *sp = ret; + } + + /* Restore the last program */ + program = SCM_FRAME_PROGRAM (fp); + CACHE_PROGRAM (); + CHECK_IP (); + NEXT; +} + +VM_DEFINE_INSTRUCTION (49, 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. */ + nvalues = FETCH (); + vm_return_values: + EXIT_HOOK (); + RETURN_HOOK (); + + ASSERT (stack_base == SCM_FRAME_UPPER_ADDRESS (fp) - 1); + + /* data[1] is the mv return address */ + if (nvalues != 1 && SCM_FRAME_MV_RETURN_ADDRESS (fp)) + { + int i; + /* Restore registers */ + sp = SCM_FRAME_LOWER_ADDRESS (fp) - 1; + ip = SCM_FRAME_MV_RETURN_ADDRESS (fp); + fp = SCM_FRAME_DYNAMIC_LINK (fp); + + /* 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 */ + NULLSTACK (stack_base - sp + nvalues + 1); + 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_RETURN_ADDRESS (fp); + fp = SCM_FRAME_DYNAMIC_LINK (fp); + + /* Push first value */ + *++sp = stack_base[1]; + + /* Finally set new stack_base */ + NULLSTACK (stack_base - sp + nvalues + 1); + 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 (); + CHECK_IP (); + NEXT; +} + +VM_DEFINE_INSTRUCTION (50, return_values_star, "return/values*", 1, -1, -1) +{ + SCM l; + + nvalues = FETCH (); + ASSERT (nvalues >= 1); + + nvalues--; + POP (l); + while (SCM_CONSP (l)) + { + PUSH (SCM_CAR (l)); + l = SCM_CDR (l); + nvalues++; + } + if (SCM_UNLIKELY (!SCM_NULL_OR_NIL_P (l))) { + finish_args = scm_list_1 (l); + goto vm_error_improper_list; + } + + goto vm_return_values; +} + +VM_DEFINE_INSTRUCTION (51, 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; +} + +VM_DEFINE_INSTRUCTION (52, box, "box", 1, 1, 0) +{ + SCM val; + POP (val); + SYNC_BEFORE_GC (); + LOCAL_SET (FETCH (), scm_cell (scm_tc7_variable, SCM_UNPACK (val))); + NEXT; +} + +/* for letrec: + (let ((a *undef*) (b *undef*) ...) + (set! a (lambda () (b ...))) + ...) + */ +VM_DEFINE_INSTRUCTION (53, empty_box, "empty-box", 1, 0, 0) +{ + SYNC_BEFORE_GC (); + LOCAL_SET (FETCH (), + scm_cell (scm_tc7_variable, SCM_UNPACK (SCM_UNDEFINED))); + NEXT; +} + +VM_DEFINE_INSTRUCTION (54, local_boxed_ref, "local-boxed-ref", 1, 0, 1) +{ + SCM v = LOCAL_REF (FETCH ()); + ASSERT_BOUND_VARIABLE (v); + PUSH (VARIABLE_REF (v)); + NEXT; +} + +VM_DEFINE_INSTRUCTION (55, local_boxed_set, "local-boxed-set", 1, 1, 0) +{ + SCM v, val; + v = LOCAL_REF (FETCH ()); + POP (val); + ASSERT_VARIABLE (v); + VARIABLE_SET (v, val); + NEXT; +} + +VM_DEFINE_INSTRUCTION (56, free_ref, "free-ref", 1, 0, 1) +{ + scm_t_uint8 idx = FETCH (); + + CHECK_FREE_VARIABLE (idx); + PUSH (FREE_VARIABLE_REF (idx)); + NEXT; +} + +/* no free-set -- if a var is assigned, it should be in a box */ + +VM_DEFINE_INSTRUCTION (57, free_boxed_ref, "free-boxed-ref", 1, 0, 1) +{ + SCM v; + scm_t_uint8 idx = FETCH (); + CHECK_FREE_VARIABLE (idx); + v = FREE_VARIABLE_REF (idx); + ASSERT_BOUND_VARIABLE (v); + PUSH (VARIABLE_REF (v)); + NEXT; +} + +VM_DEFINE_INSTRUCTION (58, free_boxed_set, "free-boxed-set", 1, 1, 0) +{ + SCM v, val; + scm_t_uint8 idx = FETCH (); + POP (val); + CHECK_FREE_VARIABLE (idx); + v = FREE_VARIABLE_REF (idx); + ASSERT_BOUND_VARIABLE (v); + VARIABLE_SET (v, val); + NEXT; +} + +VM_DEFINE_INSTRUCTION (59, make_closure, "make-closure", 0, 2, 1) +{ + SCM vect; + POP (vect); + SYNC_BEFORE_GC (); + /* fixme underflow */ + *sp = scm_double_cell (scm_tc7_program, (scm_t_bits)SCM_PROGRAM_OBJCODE (*sp), + (scm_t_bits)SCM_PROGRAM_OBJTABLE (*sp), (scm_t_bits)vect); + NEXT; +} + +VM_DEFINE_INSTRUCTION (60, make_variable, "make-variable", 0, 0, 1) +{ + SYNC_BEFORE_GC (); + /* fixme underflow */ + PUSH (scm_cell (scm_tc7_variable, SCM_UNPACK (SCM_UNDEFINED))); + NEXT; +} + +VM_DEFINE_INSTRUCTION (61, fix_closure, "fix-closure", 2, 0, 1) +{ + SCM x, vect; + unsigned int i = FETCH (); + i <<= 8; + i += FETCH (); + POP (vect); + /* FIXME CHECK_LOCAL (i) */ + x = LOCAL_REF (i); + /* FIXME ASSERT_PROGRAM (x); */ + SCM_SET_CELL_WORD_3 (x, vect); + NEXT; +} + +VM_DEFINE_INSTRUCTION (62, define, "define", 0, 0, 2) +{ + SCM sym, val; + POP (sym); + POP (val); + SYNC_REGISTER (); + VARIABLE_SET (scm_sym2var (sym, scm_current_module_lookup_closure (), + SCM_BOOL_T), + val); + NEXT; +} + +VM_DEFINE_INSTRUCTION (63, make_keyword, "make-keyword", 0, 1, 1) +{ + CHECK_UNDERFLOW (); + SYNC_REGISTER (); + *sp = scm_symbol_to_keyword (*sp); + NEXT; +} + +VM_DEFINE_INSTRUCTION (64, make_symbol, "make-symbol", 0, 1, 1) +{ + CHECK_UNDERFLOW (); + SYNC_REGISTER (); + *sp = scm_string_to_symbol (*sp); + NEXT; +} + + +/* +(defun renumber-ops () + "start from top of buffer and renumber 'VM_DEFINE_FOO (\n' sequences" + (interactive "") + (save-excursion + (let ((counter -1)) (goto-char (point-min)) + (while (re-search-forward "^VM_DEFINE_[^ ]+ (\\([^,]+\\)," (point-max) t) + (replace-match + (number-to-string (setq counter (1+ counter))) + t t nil 1))))) +*/ +/* + Local Variables: + c-file-style: "gnu" + End: +*/ |