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bytecode.c
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1993-10-06
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/* Execution of byte code produced by bytecomp.el.
Copyright (C) 1985, 1986, 1987, 1988, 1993 Free Software Foundation, Inc.
This file is part of GNU Emacs.
GNU Emacs 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.
GNU Emacs 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 GNU Emacs; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
hacked on by jwz@lucid.com 17-jun-91
o added a compile-time switch to turn on simple sanity checking;
o put back the obsolete byte-codes for error-detection;
o added a new instruction, unbind_all, which I will use for
tail-recursion elimination;
o made temp_output_buffer_show be called with the right number
of args;
o made the new bytecodes be called with args in the right order;
o added metering support.
by Hallvard:
o added relative jump instructions;
o all conditionals now only do QUIT if they jump.
*/
#include "config.h"
#include "lisp.h"
#include "buffer.h"
#include "syntax.h"
#include "bytecode_p.h"
#include "alloca_p.h"
#include "cmds_p.h"
#include "syntax_p.h"
/*
* define BYTE_CODE_SAFE to enable some minor sanity checking (useful for
* debugging the byte compiler...)
*
* define BYTE_CODE_METER to enable generation of a byte-op usage histogram.
*/
#define BYTE_CODE_SAFE
/* #define BYTE_CODE_METER */
#ifdef BYTE_CODE_METER
Lisp_Object Vbyte_code_meter, Qbyte_code_meter;
int byte_metering_on;
#define METER_2(code1, code2) \
XFASTINT (XVECTOR (XVECTOR (Vbyte_code_meter)->contents[(code1)]) \
->contents[(code2)])
#define METER_1(code) METER_2 (0, (code))
#define METER_CODE(last_code, this_code) \
{ \
if (byte_metering_on) \
{ \
if (METER_1 (this_code) != ((1<<VALBITS)-1)) \
METER_1 (this_code)++; \
if (last_code \
&& METER_2 (last_code, this_code) != ((1<<VALBITS)-1))\
METER_2 (last_code, this_code)++; \
} \
}
#else /* no BYTE_CODE_METER */
#define METER_CODE(last_code, this_code)
#endif /* no BYTE_CODE_METER */
Lisp_Object Qbytecode;
/* Byte codes: */
#define Bvarref 010
#define Bvarset 020
#define Bvarbind 030
#define Bcall 040
#define Bunbind 050
#define Bnth 070
#define Bsymbolp 071
#define Bconsp 072
#define Bstringp 073
#define Blistp 074
#define Beq 075
#define Bmemq 076
#define Bnot 077
#define Bcar 0100
#define Bcdr 0101
#define Bcons 0102
#define Blist1 0103
#define Blist2 0104
#define Blist3 0105
#define Blist4 0106
#define Blength 0107
#define Baref 0110
#define Baset 0111
#define Bsymbol_value 0112
#define Bsymbol_function 0113
#define Bset 0114
#define Bfset 0115
#define Bget 0116
#define Bsubstring 0117
#define Bconcat2 0120
#define Bconcat3 0121
#define Bconcat4 0122
#define Bsub1 0123
#define Badd1 0124
#define Beqlsign 0125
#define Bgtr 0126
#define Blss 0127
#define Bleq 0130
#define Bgeq 0131
#define Bdiff 0132
#define Bnegate 0133
#define Bplus 0134
#define Bmax 0135
#define Bmin 0136
#define Bmult 0137
#define Bpoint 0140
#define Bmark 0141 /* no longer generated as of v18 */
#define Bgoto_char 0142
#define Binsert 0143
#define Bpoint_max 0144
#define Bpoint_min 0145
#define Bchar_after 0146
#define Bfollowing_char 0147
#define Bpreceding_char 0150
#define Bcurrent_column 0151
#define Bindent_to 0152
#define Bscan_buffer 0153 /* No longer generated as of v18 */
#define Beolp 0154
#define Beobp 0155
#define Bbolp 0156
#define Bbobp 0157
#define Bcurrent_buffer 0160
#define Bset_buffer 0161
#define Bread_char 0162 /* No longer generated as of v19 */
#define Bset_mark 0163 /* this loser is no longer generated as of v18 */
#define Binteractive_p 0164 /* Needed since interactive-p takes unevalled args */
#define Bforward_char 0165
#define Bforward_word 0166
#define Bskip_chars_forward 0167
#define Bskip_chars_backward 0170
#define Bforward_line 0171
#define Bchar_syntax 0172
#define Bbuffer_substring 0173
#define Bdelete_region 0174
#define Bnarrow_to_region 0175
#define Bwiden 0176
#define Bend_of_line 0177
#define Bconstant2 0201
#define Bgoto 0202
#define Bgotoifnil 0203
#define Bgotoifnonnil 0204
#define Bgotoifnilelsepop 0205
#define Bgotoifnonnilelsepop 0206
#define Breturn 0207
#define Bdiscard 0210
#define Bdup 0211
#define Bsave_excursion 0212
#define Bsave_window_excursion 0213
#define Bsave_restriction 0214
#define Bcatch 0215
#define Bunwind_protect 0216
#define Bcondition_case 0217
#define Btemp_output_buffer_setup 0220
#define Btemp_output_buffer_show 0221
#define Bunbind_all 0222
#define Bset_marker 0223
#define Bmatch_beginning 0224
#define Bmatch_end 0225
#define Bupcase 0226
#define Bdowncase 0227
#define Bstringeqlsign 0230
#define Bstringlss 0231
#define Bequal 0232
#define Bnthcdr 0233
#define Belt 0234
#define Bmember 0235
#define Bassq 0236
#define Bnreverse 0237
#define Bsetcar 0240
#define Bsetcdr 0241
#define Bcar_safe 0242
#define Bcdr_safe 0243
#define Bnconc 0244
#define Bquo 0245
#define Brem 0246
#define Bnumberp 0247
#define Bintegerp 0250
#define BRgoto 0252
#define BRgotoifnil 0253
#define BRgotoifnonnil 0254
#define BRgotoifnilelsepop 0255
#define BRgotoifnonnilelsepop 0256
#define BlistN 0257
#define BconcatN 0260
#define BinsertN 0261
#define Bconstant 0300
#define CONSTANTLIM 0100
/* Fetch the next byte from the bytecode stream */
#define FETCH *pc++
/* Fetch two bytes from the bytecode stream
and make a 16-bit number out of them */
#define FETCH2 (op = FETCH, op + (FETCH << 8))
/* Push x onto the execution stack. */
/* This used to be #define PUSH(x) (*++stackp = (x))
This oddity is necessary because Alliant can't be bothered to
compile the preincrement operator properly, as of 4/91. -JimB */
#define PUSH(x) (stackp++, *stackp = (x))
/* Pop a value off the execution stack. */
#define POP (*stackp--)
/* Discard n values from the execution stack. */
#define DISCARD(n) (stackp -= (n))
/* Get the value which is at the top of the execution stack, but don't pop it. */
#define TOP (*stackp)
DEFUN ("byte-code", Fbyte_code, Sbyte_code, 3, 3, 0,
"Function used internally in byte-compiled code.\n\
The first argument is a string of byte code; the second, a vector of constants;\n\
the third, the maximum stack depth used in this function.\n\
If the third argument is incorrect, Emacs may crash.")
(bytestr, vector, maxdepth)
Lisp_Object bytestr, vector, maxdepth;
{
struct gcpro gcpro1, gcpro2, gcpro3;
int count = specpdl_ptr - specpdl;
#ifdef BYTE_CODE_METER
int this_op = 0;
int prev_op;
#endif
register int op;
unsigned char *pc;
Lisp_Object *stack;
register Lisp_Object *stackp;
Lisp_Object *stacke;
register Lisp_Object v1, v2;
register Lisp_Object *vectorp = XVECTOR (vector)->contents;
#ifdef BYTE_CODE_SAFE
register int const_length = XVECTOR (vector)->size;
#endif
/* Copy of BYTESTR, saved so we can tell if BYTESTR was relocated. */
Lisp_Object string_saved;
CHECK_STRING (bytestr, 0);
if (XTYPE (vector) != Lisp_Vector)
vector = wrong_type_argument (Qvectorp, vector);
CHECK_NUMBER (maxdepth, 2);
stackp = (Lisp_Object *) alloca (XFASTINT (maxdepth) * sizeof (Lisp_Object));
bzero (stackp, XFASTINT (maxdepth) * sizeof (Lisp_Object));
GCPRO3 (bytestr, vector, *stackp);
gcpro3.nvars = XFASTINT (maxdepth);
--stackp;
stack = stackp;
stacke = stackp + XFASTINT (maxdepth);
/* Initialize the saved pc-pointer for fetching from the string. */
string_saved = bytestr;
pc = XSTRING (string_saved)->data;
while (1)
{
#ifdef BYTE_CODE_SAFE
if (stackp > stacke)
error ("Byte code stack overflow (byte compiler bug), pc %d, depth %d",
pc - XSTRING (string_saved)->data, stacke - stackp);
if (stackp < stack)
error ("Byte code stack underflow (byte compiler bug), pc %d",
pc - XSTRING (string_saved)->data);
#endif
if (! EQ (string_saved, bytestr))
{
pc = pc - XSTRING (string_saved)->data + XSTRING (bytestr)->data;
string_saved = bytestr;
}
#ifdef BYTE_CODE_METER
prev_op = this_op;
this_op = op = FETCH;
METER_CODE (prev_op, op);
switch (op)
#else
switch (op = FETCH)
#endif
{
case Bvarref+6:
op = FETCH;
goto varref;
case Bvarref+7:
op = FETCH2;
goto varref;
case Bvarref: case Bvarref+1: case Bvarref+2: case Bvarref+3:
case Bvarref+4: case Bvarref+5:
op = op - Bvarref;
varref:
v1 = vectorp[op];
if (XTYPE (v1) != Lisp_Symbol)
v2 = Fsymbol_value (v1);
else
{
v2 = XSYMBOL (v1)->value;
#ifdef SWITCH_ENUM_BUG
switch ((int) XTYPE (v2))
#else
switch (XTYPE (v2))
#endif
{
case Lisp_Symbol:
if (!EQ (v2, Qunbound))
break;
case Lisp_Intfwd:
case Lisp_Boolfwd:
case Lisp_Objfwd:
case Lisp_Buffer_Local_Value:
case Lisp_Some_Buffer_Local_Value:
case Lisp_Buffer_Objfwd:
case Lisp_Void:
v2 = Fsymbol_value (v1);
}
}
PUSH (v2);
break;
case Bvarset+6:
op = FETCH;
goto varset;
case Bvarset+7:
op = FETCH2;
goto varset;
case Bvarset: case Bvarset+1: case Bvarset+2: case Bvarset+3:
case Bvarset+4: case Bvarset+5:
op -= Bvarset;
varset:
Fset (vectorp[op], POP);
break;
case Bvarbind+6:
op = FETCH;
goto varbind;
case Bvarbind+7:
op = FETCH2;
goto varbind;
case Bvarbind: case Bvarbind+1: case Bvarbind+2: case Bvarbind+3:
case Bvarbind+4: case Bvarbind+5:
op -= Bvarbind;
varbind:
specbind (vectorp[op], POP);
break;
case Bcall+6:
op = FETCH;
goto docall;
case Bcall+7:
op = FETCH2;
goto docall;
case Bcall: case Bcall+1: case Bcall+2: case Bcall+3:
case Bcall+4: case Bcall+5:
op -= Bcall;
docall:
DISCARD (op);
#ifdef BYTE_CODE_METER
if (byte_metering_on && XTYPE (TOP) == Lisp_Symbol)
{
v1 = TOP;
v2 = Fget (v1, Qbyte_code_meter);
if (XTYPE (v2) == Lisp_Int
&& XINT (v2) != ((1<<VALBITS)-1))
{
XSETINT (v2, XINT (v2) + 1);
Fput (v1, Qbyte_code_meter, v2);
}
}
#endif
TOP = Ffuncall (op + 1, &TOP);
break;
case Bunbind+6:
op = FETCH;
goto dounbind;
case Bunbind+7:
op = FETCH2;
goto dounbind;
case Bunbind: case Bunbind+1: case Bunbind+2: case Bunbind+3:
case Bunbind+4: case Bunbind+5:
op -= Bunbind;
dounbind:
unbind_to (specpdl_ptr - specpdl - op, Qnil);
break;
case Bunbind_all:
/* To unbind back to the beginning of this frame. Not used yet,
but will be needed for tail-recursion elimination. */
unbind_to (count, Qnil);
break;
case Bgoto:
QUIT;
op = FETCH2; /* pc = FETCH2 loses since FETCH2 contains pc++ */
pc = XSTRING (string_saved)->data + op;
break;
case Bgotoifnil:
op = FETCH2;
if (NILP (POP))
{
QUIT;
pc = XSTRING (string_saved)->data + op;
}
break;
case Bgotoifnonnil:
op = FETCH2;
if (!NILP (POP))
{
QUIT;
pc = XSTRING (string_saved)->data + op;
}
break;
case Bgotoifnilelsepop:
op = FETCH2;
if (NILP (TOP))
{
QUIT;
pc = XSTRING (string_saved)->data + op;
}
else DISCARD (1);
break;
case Bgotoifnonnilelsepop:
op = FETCH2;
if (!NILP (TOP))
{
QUIT;
pc = XSTRING (string_saved)->data + op;
}
else DISCARD (1);
break;
case BRgoto:
QUIT;
pc += *pc - 127;
break;
case BRgotoifnil:
if (NILP (POP))
{
QUIT;
pc += *pc - 128;
}
pc++;
break;
case BRgotoifnonnil:
if (!NILP (POP))
{
QUIT;
pc += *pc - 128;
}
pc++;
break;
case BRgotoifnilelsepop:
op = *pc++;
if (NILP (TOP))
{
QUIT;
pc += op - 128;
}
else DISCARD (1);
break;
case BRgotoifnonnilelsepop:
op = *pc++;
if (!NILP (TOP))
{
QUIT;
pc += op - 128;
}
else DISCARD (1);
break;
case Breturn:
v1 = POP;
goto exit;
case Bdiscard:
DISCARD (1);
break;
case Bdup:
v1 = TOP;
PUSH (v1);
break;
case Bconstant2:
PUSH (vectorp[FETCH2]);
break;
case Bsave_excursion:
record_unwind_protect (save_excursion_restore, save_excursion_save ());
break;
case Bsave_window_excursion:
TOP = Fsave_window_excursion (TOP);
break;
case Bsave_restriction:
record_unwind_protect (save_restriction_restore, save_restriction_save ());
break;
case Bcatch:
v1 = POP;
TOP = internal_catch (TOP, Feval, v1);
break;
case Bunwind_protect:
record_unwind_protect (0, POP);
(specpdl_ptr - 1)->symbol = Qnil;
break;
case Bcondition_case:
v1 = POP;
v1 = Fcons (POP, v1);
TOP = Fcondition_case (Fcons (TOP, v1));
break;
case Btemp_output_buffer_setup:
temp_output_buffer_setup (XSTRING (TOP)->data);
TOP = Vstandard_output;
break;
case Btemp_output_buffer_show:
v1 = POP;
temp_output_buffer_show (TOP);
TOP = v1;
/* pop binding of standard-output */
unbind_to (specpdl_ptr - specpdl - 1, Qnil);
break;
case Bnth:
v1 = POP;
v2 = TOP;
nth_entry:
CHECK_NUMBER (v2, 0);
op = XINT (v2);
immediate_quit = 1;
while (--op >= 0)
{
if (CONSP (v1))
v1 = XCONS (v1)->cdr;
else if (!NILP (v1))
{
immediate_quit = 0;
v1 = wrong_type_argument (Qlistp, v1);
immediate_quit = 1;
op++;
}
}
immediate_quit = 0;
goto docar;
case Bsymbolp:
TOP = XTYPE (TOP) == Lisp_Symbol ? Qt : Qnil;
break;
case Bconsp:
TOP = CONSP (TOP) ? Qt : Qnil;
break;
case Bstringp:
TOP = XTYPE (TOP) == Lisp_String ? Qt : Qnil;
break;
case Blistp:
TOP = CONSP (TOP) || NILP (TOP) ? Qt : Qnil;
break;
case Beq:
v1 = POP;
TOP = EQ (v1, TOP) ? Qt : Qnil;
break;
case Bmemq:
v1 = POP;
TOP = Fmemq (TOP, v1);
break;
case Bnot:
TOP = NILP (TOP) ? Qt : Qnil;
break;
case Bcar:
v1 = TOP;
docar:
if (CONSP (v1)) TOP = XCONS (v1)->car;
else if (NILP (v1)) TOP = Qnil;
else Fcar (wrong_type_argument (Qlistp, v1));
break;
case Bcdr:
v1 = TOP;
if (CONSP (v1)) TOP = XCONS (v1)->cdr;
else if (NILP (v1)) TOP = Qnil;
else Fcdr (wrong_type_argument (Qlistp, v1));
break;
case Bcons:
v1 = POP;
TOP = Fcons (TOP, v1);
break;
case Blist1:
TOP = Fcons (TOP, Qnil);
break;
case Blist2:
v1 = POP;
TOP = Fcons (TOP, Fcons (v1, Qnil));
break;
case Blist3:
DISCARD (2);
TOP = Flist (3, &TOP);
break;
case Blist4:
DISCARD (3);
TOP = Flist (4, &TOP);
break;
case BlistN:
op = FETCH;
DISCARD (op - 1);
TOP = Flist (op, &TOP);
break;
case Blength:
TOP = Flength (TOP);
break;
case Baref:
v1 = POP;
TOP = Faref (TOP, v1);
break;
case Baset:
v2 = POP; v1 = POP;
TOP = Faset (TOP, v1, v2);
break;
case Bsymbol_value:
TOP = Fsymbol_value (TOP);
break;
case Bsymbol_function:
TOP = Fsymbol_function (TOP);
break;
case Bset:
v1 = POP;
TOP = Fset (TOP, v1);
break;
case Bfset:
v1 = POP;
TOP = Ffset (TOP, v1);
break;
case Bget:
v1 = POP;
TOP = Fget (TOP, v1);
break;
case Bsubstring:
v2 = POP; v1 = POP;
TOP = Fsubstring (TOP, v1, v2);
break;
case Bconcat2:
DISCARD (1);
TOP = Fconcat (2, &TOP);
break;
case Bconcat3:
DISCARD (2);
TOP = Fconcat (3, &TOP);
break;
case Bconcat4:
DISCARD (3);
TOP = Fconcat (4, &TOP);
break;
case BconcatN:
op = FETCH;
DISCARD (op - 1);
TOP = Fconcat (op, &TOP);
break;
case Bsub1:
v1 = TOP;
if (XTYPE (v1) == Lisp_Int)
{
XSETINT (v1, XINT (v1) - 1);
TOP = v1;
}
else
TOP = Fsub1 (v1);
break;
case Badd1:
v1 = TOP;
if (XTYPE (v1) == Lisp_Int)
{
XSETINT (v1, XINT (v1) + 1);
TOP = v1;
}
else
TOP = Fadd1 (v1);
break;
case Beqlsign:
v2 = POP; v1 = TOP;
CHECK_NUMBER_OR_FLOAT_COERCE_MARKER (v1, 0);
CHECK_NUMBER_OR_FLOAT_COERCE_MARKER (v2, 0);
TOP = (XFLOATINT (v1) == XFLOATINT (v2)) ? Qt : Qnil;
break;
case Bgtr:
v1 = POP;
TOP = Fgtr (TOP, v1);
break;
case Blss:
v1 = POP;
TOP = Flss (TOP, v1);
break;
case Bleq:
v1 = POP;
TOP = Fleq (TOP, v1);
break;
case Bgeq:
v1 = POP;
TOP = Fgeq (TOP, v1);
break;
case Bdiff:
DISCARD (1);
TOP = Fminus (2, &TOP);
break;
case Bnegate:
v1 = TOP;
if (XTYPE (v1) == Lisp_Int)
{
XSETINT (v1, - XINT (v1));
TOP = v1;
}
else
TOP = Fminus (1, &TOP);
break;
case Bplus:
DISCARD (1);
TOP = Fplus (2, &TOP);
break;
case Bmax:
DISCARD (1);
TOP = Fmax (2, &TOP);
break;
case Bmin:
DISCARD (1);
TOP = Fmin (2, &TOP);
break;
case Bmult:
DISCARD (1);
TOP = Ftimes (2, &TOP);
break;
case Bquo:
DISCARD (1);
TOP = Fquo (2, &TOP);
break;
case Brem:
v1 = POP;
TOP = Frem (TOP, v1);
break;
case Bpoint:
XFASTINT (v1) = point;
PUSH (v1);
break;
case Bgoto_char:
TOP = Fgoto_char (TOP);
break;
case Binsert:
TOP = Finsert (1, &TOP);
break;
case BinsertN:
op = FETCH;
DISCARD (op - 1);
TOP = Finsert (op, &TOP);
break;
case Bpoint_max:
XFASTINT (v1) = ZV;
PUSH (v1);
break;
case Bpoint_min:
XFASTINT (v1) = BEGV;
PUSH (v1);
break;
case Bchar_after:
TOP = Fchar_after (TOP);
break;
case Bfollowing_char:
XFASTINT (v1) = PT == ZV ? 0 : FETCH_CHAR (point);
PUSH (v1);
break;
case Bpreceding_char:
XFASTINT (v1) = point <= BEGV ? 0 : FETCH_CHAR (point - 1);
PUSH (v1);
break;
case Bcurrent_column:
XFASTINT (v1) = current_column ();
PUSH (v1);
break;
case Bindent_to:
TOP = Findent_to (TOP, Qnil);
break;
case Beolp:
PUSH (Feolp ());
break;
case Beobp:
PUSH (Feobp ());
break;
case Bbolp:
PUSH (Fbolp ());
break;
case Bbobp:
PUSH (Fbobp ());
break;
case Bcurrent_buffer:
PUSH (Fcurrent_buffer ());
break;
case Bset_buffer:
TOP = Fset_buffer (TOP);
break;
case Bread_char:
PUSH (Fread_char ());
QUIT;
break;
case Binteractive_p:
PUSH (Finteractive_p ());
break;
case Bforward_char:
TOP = Fforward_char (TOP);
break;
case Bforward_word:
TOP = Fforward_word (TOP);
break;
case Bskip_chars_forward:
v1 = POP;
TOP = Fskip_chars_forward (TOP, v1);
break;
case Bskip_chars_backward:
v1 = POP;
TOP = Fskip_chars_backward (TOP, v1);
break;
case Bforward_line:
TOP = Fforward_line (TOP);
break;
case Bchar_syntax:
CHECK_NUMBER (TOP, 0);
XFASTINT (TOP) = syntax_code_spec[(int) SYNTAX (0xFF & XINT (TOP))];
break;
case Bbuffer_substring:
v1 = POP;
TOP = Fbuffer_substring (TOP, v1);
break;
case Bdelete_region:
v1 = POP;
TOP = Fdelete_region (TOP, v1);
break;
case Bnarrow_to_region:
v1 = POP;
TOP = Fnarrow_to_region (TOP, v1);
break;
case Bwiden:
PUSH (Fwiden ());
break;
case Bend_of_line:
TOP = Fend_of_line (TOP);
break;
case Bset_marker:
v1 = POP;
v2 = POP;
TOP = Fset_marker (TOP, v2, v1);
break;
case Bmatch_beginning:
TOP = Fmatch_beginning (TOP);
break;
case Bmatch_end:
TOP = Fmatch_end (TOP);
break;
case Bupcase:
TOP = Fupcase (TOP);
break;
case Bdowncase:
TOP = Fdowncase (TOP);
break;
case Bstringeqlsign:
v1 = POP;
TOP = Fstring_equal (TOP, v1);
break;
case Bstringlss:
v1 = POP;
TOP = Fstring_lessp (TOP, v1);
break;
case Bequal:
v1 = POP;
TOP = Fequal (TOP, v1);
break;
case Bnthcdr:
v1 = POP;
TOP = Fnthcdr (TOP, v1);
break;
case Belt:
if (XTYPE (TOP) == Lisp_Cons)
{
/* Exchange args and then do nth. */
v2 = POP;
v1 = TOP;
goto nth_entry;
}
v1 = POP;
TOP = Felt (TOP, v1);
break;
case Bmember:
v1 = POP;
TOP = Fmember (TOP, v1);
break;
case Bassq:
v1 = POP;
TOP = Fassq (TOP, v1);
break;
case Bnreverse:
TOP = Fnreverse (TOP);
break;
case Bsetcar:
v1 = POP;
TOP = Fsetcar (TOP, v1);
break;
case Bsetcdr:
v1 = POP;
TOP = Fsetcdr (TOP, v1);
break;
case Bcar_safe:
v1 = TOP;
if (XTYPE (v1) == Lisp_Cons)
TOP = XCONS (v1)->car;
else
TOP = Qnil;
break;
case Bcdr_safe:
v1 = TOP;
if (XTYPE (v1) == Lisp_Cons)
TOP = XCONS (v1)->cdr;
else
TOP = Qnil;
break;
case Bnconc:
DISCARD (1);
TOP = Fnconc (2, &TOP);
break;
case Bnumberp:
TOP = (NUMBERP (TOP) ? Qt : Qnil);
break;
case Bintegerp:
TOP = XTYPE (TOP) == Lisp_Int ? Qt : Qnil;
break;
#ifdef BYTE_CODE_SAFE
case Bset_mark:
error ("set-mark is an obsolete bytecode");
break;
case Bscan_buffer:
error ("scan-buffer is an obsolete bytecode");
break;
case Bmark:
error ("mark is an obsolete bytecode");
break;
#endif
default:
#ifdef BYTE_CODE_SAFE
if (op < Bconstant)
error ("unknown bytecode %d (byte compiler bug)", op);
if ((op -= Bconstant) >= const_length)
error ("no constant number %d (byte compiler bug)", op);
PUSH (vectorp[op]);
#else
PUSH (vectorp[op - Bconstant]);
#endif
}
}
exit:
UNGCPRO;
/* Binds and unbinds are supposed to be compiled balanced. */
if (specpdl_ptr - specpdl != count)
#ifdef BYTE_CODE_SAFE
error ("binding stack not balanced (serious byte compiler bug)");
#else
abort ();
#endif
return v1;
}
_VOID_
syms_of_bytecode ()
{
Qbytecode = intern ("byte-code");
staticpro (&Qbytecode);
defsubr (&Sbyte_code);
#ifdef BYTE_CODE_METER
DEFVAR_LISP ("byte-code-meter", &Vbyte_code_meter,
"A vector of vectors which holds a histogram of byte-code usage.\n\
(aref (aref byte-code-meter 0) CODE) indicates how many times the byte\n\
opcode CODE has been executed.\n\
(aref (aref byte-code-meter CODE1) CODE2), where CODE1 is not 0,\n\
indicates how many times the byte opcodes CODE1 and CODE2 have been\n\
executed in succession.");
DEFVAR_BOOL ("byte-metering-on", &byte_metering_on,
"If non-nil, keep profiling information on byte code usage.\n\
The variable byte-code-meter indicates how often each byte opcode is used.\n\
If a symbol has a property named `byte-code-meter' whose value is an\n\
integer, it is incremented each time that symbol's function is called.");
byte_metering_on = 0;
Vbyte_code_meter = Fmake_vector (make_number (256), make_number (0));
Qbyte_code_meter = intern ("byte-code-meter");
staticpro (&Qbyte_code_meter);
{
int i = 256;
while (i--)
XVECTOR (Vbyte_code_meter)->contents[i] =
Fmake_vector (make_number (256), make_number (0));
}
#endif
}