From 36f7ba0a1e3ee4a5ae38e1bea50dbee5d953e992 Mon Sep 17 00:00:00 2001
From: Jim Blandy <jimb@redhat.com>
Date: Tue, 2 Jul 1991 22:37:47 +0000
Subject: [PATCH] Initial revision

---
 src/bytecode.c | 1051 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 1051 insertions(+)
 create mode 100644 src/bytecode.c

diff --git a/src/bytecode.c b/src/bytecode.c
new file mode 100644
index 00000000000..f888a68b7f6
--- /dev/null
+++ b/src/bytecode.c
@@ -0,0 +1,1051 @@
+/* Execution of byte code produced by bytecomp.el.
+   Copyright (C) 1985, 1986, 1987, 1988 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 1, 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 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  put back fset, symbol-function, and read-char because I don't
+     see any reason for them to have been removed;
+  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"
+
+/* Define this to enable some minor sanity checking
+   (useful for debugging the byte compiler...)
+ */
+#define BYTE_CODE_SAFE
+
+/* Define this to enable generation of a histogram of byte-op usage.
+ */
+#define BYTE_CODE_METER
+
+
+#ifdef BYTE_CODE_METER
+
+Lisp_Object Vbyte_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 /* ! BYTE_CODE_METER */
+
+# define meter_code(last_code, this_code)
+
+#endif
+
+
+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 /* no longer generated as of v19 */
+#define Bset 0114
+#define Bfset 0115 /* no longer generated as of v19 */
+#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
+#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 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 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 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;
+  /* Cached address of beginning of string,
+     valid if BYTESTR equals STRING_SAVED.  */
+  register unsigned char *strbeg;
+
+  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 (
+     "Stack overflow in byte code (byte compiler bug), pc = %d, depth = %d",
+	       pc - XSTRING (string_saved)->data, stacke - stackp);
+      if (stackp < stack)
+	error ("Stack underflow in byte code (byte compiler bug), pc = %d",
+	       pc - XSTRING (string_saved)->data);
+#endif
+
+      if (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);
+	  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 wil 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 (NULL (POP))
+	    {
+	      QUIT;
+	      pc = XSTRING (string_saved)->data + op;
+	    }
+	  break;
+
+	case Bgotoifnonnil:
+	  op = FETCH2;
+	  if (!NULL (POP))
+	    {
+	      QUIT;
+	      pc = XSTRING (string_saved)->data + op;
+	    }
+	  break;
+
+	case Bgotoifnilelsepop:
+	  op = FETCH2;
+	  if (NULL (TOP))
+	    {
+	      QUIT;
+	      pc = XSTRING (string_saved)->data + op;
+	    }
+	  else DISCARD(1);
+	  break;
+
+	case Bgotoifnonnilelsepop:
+	  op = FETCH2;
+	  if (!NULL (TOP))
+	    {
+	      QUIT;
+	      pc = XSTRING (string_saved)->data + op;
+	    }
+	  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, Qnil);
+	  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 (!NULL (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) || NULL (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 = NULL (TOP) ? Qt : Qnil;
+	  break;
+
+	case Bcar:
+	  v1 = TOP;
+	docar:
+	  if (CONSP (v1)) TOP = XCONS (v1)->car;
+	  else if (NULL (v1)) TOP = Qnil;
+	  else Fcar (wrong_type_argument (Qlistp, v1));
+	  break;
+
+	case Bcdr:
+	  v1 = TOP;
+	  if (CONSP (v1)) TOP = XCONS (v1)->cdr;
+	  else if (NULL (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 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 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;
+	  /* This had args in the wrong order.  -- jwz */
+	  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 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:
+	  /* This was wrong!  --jwz */
+	  TOP = Fforward_char (TOP);
+	  break;
+
+	case Bforward_word:
+	  /* This was wrong!  --jwz */
+	  TOP = Fforward_word (TOP);
+	  break;
+
+	case Bskip_chars_forward:
+	  /* This was wrong!  --jwz */
+	  v1 = POP;
+	  TOP = Fskip_chars_forward (TOP, v1);
+	  break;
+
+	case Bskip_chars_backward:
+	  /* This was wrong!  --jwz */
+	  v1 = POP;
+	  TOP = Fskip_chars_backward (TOP, v1);
+	  break;
+
+	case Bforward_line:
+	  /* This was wrong!  --jwz */
+	  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;
+	  /* This had args in the wrong order.  -- jwz */
+	  TOP = Fdelete_region (TOP, v1);
+	  break;
+
+	case Bnarrow_to_region:
+	  v1 = POP;
+	  /* This had args in the wrong order.  -- jwz */
+	  TOP = Fnarrow_to_region (TOP, v1);
+	  break;
+
+	case Bwiden:
+	  PUSH (Fwiden ());
+	  break;
+
+	case Bstringeqlsign:
+	  v1 = POP;
+	  /* This had args in the wrong order.  -- jwz */
+	  TOP = Fstring_equal (TOP, v1);
+	  break;
+
+	case Bstringlss:
+	  v1 = POP;
+	  /* This had args in the wrong order.  -- jwz */
+	  TOP = Fstring_lessp (TOP, v1);
+	  break;
+
+	case Bequal:
+	  v1 = POP;
+	  /* This had args in the wrong order.  -- jwz */
+	  TOP = Fequal (TOP, v1);
+	  break;
+
+	case Bnthcdr:
+	  v1 = POP;
+	  /* This had args in the wrong order.  -- jwz */
+	  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;
+	  /* This had args in the wrong order.  -- jwz */
+	  TOP = Fmember (TOP, v1);
+	  break;
+
+	case Bassq:
+	  v1 = POP;
+	  /* This had args in the wrong order.  -- jwz */
+	  TOP = Fassq (TOP, v1);
+	  break;
+
+	case Bnreverse:
+	  TOP = Fnreverse (TOP);
+	  break;
+
+	case Bsetcar:
+	  v1 = POP;
+	  /* This had args in the wrong order.  -- jwz */
+	  TOP = Fsetcar (TOP, v1);
+	  break;
+
+	case Bsetcdr:
+	  v1 = POP;
+	  /* This had args in the wrong order.  -- jwz */
+	  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 = (XTYPE (TOP) == Lisp_Int || XTYPE (TOP) == Lisp_Float
+		 ? 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;
+}
+
+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.");
+  DEFVAR_BOOL ("byte-metering-on", &byte_metering_on, "");
+
+  byte_metering_on = 0;
+  Vbyte_code_meter = Fmake_vector(make_number(256), make_number(0));
+
+  {
+    int i = 256;
+    while (i--)
+      XVECTOR(Vbyte_code_meter)->contents[i] =
+	Fmake_vector(make_number(256), make_number(0));
+  }
+#endif
+}