/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * vim: set ts=8 sw=4 et tw=0 ft=C:
 *
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla Communicator client code, released
 * March 31, 1998.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

/*
 * JavaScript operation bytecodes.  If you need to allocate a bytecode, look
 * for a name of the form JSOP_UNUSED* and claim it.  Otherwise, always add at
 * the end of the table.
 *
 * Includers must define an OPDEF macro of the following form:
 *
 * #define OPDEF(op,val,name,image,length,nuses,ndefs,prec,format) ...
 *
 * Selected arguments can be expanded in initializers.  The op argument is
 * expanded followed by comma in the JSOp enum (jsopcode.h), e.g.  The value
 * field must be dense for now, because jsopcode.c uses an OPDEF() expansion
 * inside the js_CodeSpec[] initializer.
 *
 * Field        Description
 * op           Bytecode name, which is the JSOp enumerator name
 * value        Bytecode value, which is the JSOp enumerator value
 * name         C string containing name for disassembler
 * image        C string containing "image" for pretty-printer, null if ugly
 * length       Number of bytes including any immediate operands
 * nuses        Number of stack slots consumed by bytecode, -1 if variadic
 * ndefs        Number of stack slots produced by bytecode
 * prec         Operator precedence, zero if not an operator
 * format       Bytecode plus immediate operand encoding format
 *
 * Precedence   Operators               Opcodes
 *  1           let (x = y) z, yield w  JSOP_LEAVEBLOCKEXPR, JSOP_YIELD
 *  2           ,                       JSOP_POP with SRC_PCDELTA, JSOP_RETURN
 *  3           =, +=, etc.             JSOP_SETNAME, etc. (all JOF_ASSIGNING)
 *  4           ?:                      JSOP_IFEQ, JSOP_IFEQX
 *  5           ||                      JSOP_OR, JSOP_ORX
 *  6           &&                      JSOP_AND, JSOP_ANDX
 *  7           |                       JSOP_BITOR
 *  8           ^                       JSOP_BITXOR
 *  9           &                       JSOP_BITAND
 * 10           ==, !=, etc.            JSOP_EQ, JSOP_NE, etc.
 * 11           <, in, etc.             JSOP_LT, JSOP_IN, etc.
 * 12           <<, >>, >>>             JSOP_LSH, JSOP_RSH, JSOP_URSH
 * 13           +, -, etc.              JSOP_ADD, JSOP_SUB, etc.
 * 14           *, /, %                 JSOP_MUL, JSOP_DIV, JSOP_MOD
 * 15           !, ~, etc.              JSOP_NOT, JSOP_BITNOT, etc.
 * 16           3.14, 0, etc.           JSOP_DOUBLE, JSOP_ZERO, etc.
 * 17           delete, new             JSOP_DEL*, JSOP_NEW
 * 18           x.y, f(), etc.          JSOP_GETPROP, JSOP_CALL, etc.
 * 19           x, null, etc.           JSOP_NAME, JSOP_NULL, etc.
 *
 * The push-numeric-constant operators, JSOP_ZERO, JSOP_DOUBLE, etc., have
 * lower precedence than the member operators emitted for the . operator, to
 * cause the decompiler to parenthesize the . left operand, e.g. (0).foo.
 * Otherwise the . could be taken as a decimal point.  We use the same level
 * 16 for function expressions too, to force parenthesization.
 *
 * This file is best viewed with 128 columns:
12345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678
 */

/* legend: op         val name          image       len use def prec  format */

/* Longstanding JavaScript bytecodes. */
OPDEF(JSOP_NOP,       0,  "nop",        NULL,         1,  0,  0,  0,  JOF_BYTE)
OPDEF(JSOP_PUSH,      1,  "push",       NULL,         1,  0,  1,  0,  JOF_BYTE)
OPDEF(JSOP_POPV,      2,  "popv",       NULL,         1,  1,  0,  2,  JOF_BYTE)
OPDEF(JSOP_ENTERWITH, 3,  "enterwith",  NULL,         1,  1,  1,  0,  JOF_BYTE|JOF_PARENHEAD)
OPDEF(JSOP_LEAVEWITH, 4,  "leavewith",  NULL,         1,  1,  0,  0,  JOF_BYTE)
OPDEF(JSOP_RETURN,    5,  "return",     NULL,         1,  1,  0,  2,  JOF_BYTE)
OPDEF(JSOP_GOTO,      6,  "goto",       NULL,         3,  0,  0,  0,  JOF_JUMP)
OPDEF(JSOP_IFEQ,      7,  "ifeq",       NULL,         3,  1,  0,  4,  JOF_JUMP|JOF_DETECTING)
OPDEF(JSOP_IFNE,      8,  "ifne",       NULL,         3,  1,  0,  0,  JOF_JUMP|JOF_PARENHEAD)

/* Get the arguments object for the current, lightweight function activation. */
OPDEF(JSOP_ARGUMENTS, 9, js_arguments_str, js_arguments_str, 1, 0, 1, 18, JOF_BYTE)

/* ECMA-compliant for-in loop with argument or local variable loop control. */
OPDEF(JSOP_FORARG,    10, "forarg",     NULL,         3,  0,  1, 19,  JOF_QARG|JOF_NAME|JOF_FOR)
OPDEF(JSOP_FORVAR,    11, "forvar",     NULL,         3,  0,  1, 19,  JOF_QVAR|JOF_NAME|JOF_FOR)

/* More longstanding bytecodes. */
OPDEF(JSOP_DUP,       12, "dup",        NULL,         1,  1,  2,  0,  JOF_BYTE)
OPDEF(JSOP_DUP2,      13, "dup2",       NULL,         1,  2,  4,  0,  JOF_BYTE)
OPDEF(JSOP_SETCONST,  14, "setconst",   NULL,         3,  1,  1,  3,  JOF_ATOM|JOF_NAME|JOF_SET)
OPDEF(JSOP_BITOR,     15, "bitor",      "|",          1,  2,  1,  7,  JOF_BYTE|JOF_LEFTASSOC)
OPDEF(JSOP_BITXOR,    16, "bitxor",     "^",          1,  2,  1,  8,  JOF_BYTE|JOF_LEFTASSOC)
OPDEF(JSOP_BITAND,    17, "bitand",     "&",          1,  2,  1,  9,  JOF_BYTE|JOF_LEFTASSOC)
OPDEF(JSOP_EQ,        18, "eq",         "==",         1,  2,  1,  10,  JOF_BYTE|JOF_LEFTASSOC|JOF_DETECTING)
OPDEF(JSOP_NE,        19, "ne",         "!=",         1,  2,  1,  10,  JOF_BYTE|JOF_LEFTASSOC|JOF_DETECTING)
OPDEF(JSOP_LT,        20, "lt",         "<",          1,  2,  1, 11,  JOF_BYTE|JOF_LEFTASSOC)
OPDEF(JSOP_LE,        21, "le",         "<=",         1,  2,  1, 11,  JOF_BYTE|JOF_LEFTASSOC)
OPDEF(JSOP_GT,        22, "gt",         ">",          1,  2,  1, 11,  JOF_BYTE|JOF_LEFTASSOC)
OPDEF(JSOP_GE,        23, "ge",         ">=",         1,  2,  1, 11,  JOF_BYTE|JOF_LEFTASSOC)
OPDEF(JSOP_LSH,       24, "lsh",        "<<",         1,  2,  1, 12,  JOF_BYTE|JOF_LEFTASSOC)
OPDEF(JSOP_RSH,       25, "rsh",        ">>",         1,  2,  1, 12,  JOF_BYTE|JOF_LEFTASSOC)
OPDEF(JSOP_URSH,      26, "ursh",       ">>>",        1,  2,  1, 12,  JOF_BYTE|JOF_LEFTASSOC)
OPDEF(JSOP_ADD,       27, "add",        "+",          1,  2,  1, 13,  JOF_BYTE|JOF_LEFTASSOC)
OPDEF(JSOP_SUB,       28, "sub",        "-",          1,  2,  1, 13,  JOF_BYTE|JOF_LEFTASSOC)
OPDEF(JSOP_MUL,       29, "mul",        "*",          1,  2,  1, 14,  JOF_BYTE|JOF_LEFTASSOC)
OPDEF(JSOP_DIV,       30, "div",        "/",          1,  2,  1, 14,  JOF_BYTE|JOF_LEFTASSOC)
OPDEF(JSOP_MOD,       31, "mod",        "%",          1,  2,  1, 14,  JOF_BYTE|JOF_LEFTASSOC)
OPDEF(JSOP_NOT,       32, "not",        "!",          1,  1,  1, 15,  JOF_BYTE|JOF_DETECTING)
OPDEF(JSOP_BITNOT,    33, "bitnot",     "~",          1,  1,  1, 15,  JOF_BYTE)
OPDEF(JSOP_NEG,       34, "neg",        "- ",         1,  1,  1, 15,  JOF_BYTE)
OPDEF(JSOP_NEW,       35, js_new_str,   NULL,         3, -1,  1, 17,  JOF_UINT16|JOF_INVOKE)
OPDEF(JSOP_DELNAME,   36, "delname",    NULL,         3,  0,  1, 17,  JOF_ATOM|JOF_NAME|JOF_DEL)
OPDEF(JSOP_DELPROP,   37, "delprop",    NULL,         3,  1,  1, 17,  JOF_ATOM|JOF_PROP|JOF_DEL)
OPDEF(JSOP_DELELEM,   38, "delelem",    NULL,         1,  2,  1, 17,  JOF_BYTE |JOF_ELEM|JOF_DEL)
OPDEF(JSOP_TYPEOF,    39, js_typeof_str,NULL,         1,  1,  1, 15,  JOF_BYTE|JOF_DETECTING)
OPDEF(JSOP_VOID,      40, js_void_str,  NULL,         1,  1,  1, 15,  JOF_BYTE)

OPDEF(JSOP_INCNAME,   41, "incname",    NULL,         3,  0,  1, 15,  JOF_ATOM|JOF_NAME|JOF_INC|JOF_TMPSLOT2)
OPDEF(JSOP_INCPROP,   42, "incprop",    NULL,         3,  1,  1, 15,  JOF_ATOM|JOF_PROP|JOF_INC|JOF_TMPSLOT2)
OPDEF(JSOP_INCELEM,   43, "incelem",    NULL,         1,  2,  1, 15,  JOF_BYTE |JOF_ELEM|JOF_INC|JOF_TMPSLOT2)
OPDEF(JSOP_DECNAME,   44, "decname",    NULL,         3,  0,  1, 15,  JOF_ATOM|JOF_NAME|JOF_DEC|JOF_TMPSLOT2)
OPDEF(JSOP_DECPROP,   45, "decprop",    NULL,         3,  1,  1, 15,  JOF_ATOM|JOF_PROP|JOF_DEC|JOF_TMPSLOT2)
OPDEF(JSOP_DECELEM,   46, "decelem",    NULL,         1,  2,  1, 15,  JOF_BYTE |JOF_ELEM|JOF_DEC|JOF_TMPSLOT2)
OPDEF(JSOP_NAMEINC,   47, "nameinc",    NULL,         3,  0,  1, 15,  JOF_ATOM|JOF_NAME|JOF_INC|JOF_POST|JOF_TMPSLOT2)
OPDEF(JSOP_PROPINC,   48, "propinc",    NULL,         3,  1,  1, 15,  JOF_ATOM|JOF_PROP|JOF_INC|JOF_POST|JOF_TMPSLOT2)
OPDEF(JSOP_ELEMINC,   49, "eleminc",    NULL,         1,  2,  1, 15,  JOF_BYTE |JOF_ELEM|JOF_INC|JOF_POST|JOF_TMPSLOT2)
OPDEF(JSOP_NAMEDEC,   50, "namedec",    NULL,         3,  0,  1, 15,  JOF_ATOM|JOF_NAME|JOF_DEC|JOF_POST|JOF_TMPSLOT2)
OPDEF(JSOP_PROPDEC,   51, "propdec",    NULL,         3,  1,  1, 15,  JOF_ATOM|JOF_PROP|JOF_DEC|JOF_POST|JOF_TMPSLOT2)
OPDEF(JSOP_ELEMDEC,   52, "elemdec",    NULL,         1,  2,  1, 15,  JOF_BYTE |JOF_ELEM|JOF_DEC|JOF_POST|JOF_TMPSLOT2)

OPDEF(JSOP_GETPROP,   53, "getprop",    NULL,         3,  1,  1, 18,  JOF_ATOM|JOF_PROP)
OPDEF(JSOP_SETPROP,   54, "setprop",    NULL,         3,  2,  1,  3,  JOF_ATOM|JOF_PROP|JOF_SET|JOF_DETECTING)
OPDEF(JSOP_GETELEM,   55, "getelem",    NULL,         1,  2,  1, 18,  JOF_BYTE |JOF_ELEM|JOF_LEFTASSOC)
OPDEF(JSOP_SETELEM,   56, "setelem",    NULL,         1,  3,  1,  3,  JOF_BYTE |JOF_ELEM|JOF_SET|JOF_DETECTING)
OPDEF(JSOP_CALLNAME,  57, "callname",   NULL,         3,  0,  2, 19,  JOF_ATOM|JOF_NAME|JOF_CALLOP)
OPDEF(JSOP_CALL,      58, "call",       NULL,         3, -1,  1, 18,  JOF_UINT16|JOF_INVOKE)
OPDEF(JSOP_NAME,      59, "name",       NULL,         3,  0,  1, 19,  JOF_ATOM|JOF_NAME)
OPDEF(JSOP_DOUBLE,    60, "double",     NULL,         3,  0,  1, 16,  JOF_ATOM)
OPDEF(JSOP_STRING,    61, "string",     NULL,         3,  0,  1, 19,  JOF_ATOM)
OPDEF(JSOP_ZERO,      62, "zero",       "0",          1,  0,  1, 16,  JOF_BYTE)
OPDEF(JSOP_ONE,       63, "one",        "1",          1,  0,  1, 16,  JOF_BYTE)
OPDEF(JSOP_NULL,      64, js_null_str,  js_null_str,  1,  0,  1, 19,  JOF_BYTE)
OPDEF(JSOP_THIS,      65, js_this_str,  js_this_str,  1,  0,  1, 19,  JOF_BYTE)
OPDEF(JSOP_FALSE,     66, js_false_str, js_false_str, 1,  0,  1, 19,  JOF_BYTE)
OPDEF(JSOP_TRUE,      67, js_true_str,  js_true_str,  1,  0,  1, 19,  JOF_BYTE)
OPDEF(JSOP_OR,        68, "or",         NULL,         3,  1,  0,  5,  JOF_JUMP|JOF_DETECTING|JOF_LEFTASSOC)
OPDEF(JSOP_AND,       69, "and",        NULL,         3,  1,  0,  6,  JOF_JUMP|JOF_DETECTING|JOF_LEFTASSOC)

/* The switch bytecodes have variable length. */
OPDEF(JSOP_TABLESWITCH,  70, "tableswitch",  NULL,   -1,  1,  0,  0,  JOF_TABLESWITCH|JOF_DETECTING|JOF_PARENHEAD)
OPDEF(JSOP_LOOKUPSWITCH, 71, "lookupswitch", NULL,   -1,  1,  0,  0,  JOF_LOOKUPSWITCH|JOF_DETECTING|JOF_PARENHEAD)

/* New, infallible/transitive identity ops. */
OPDEF(JSOP_STRICTEQ,  72, "stricteq",   NULL,         1,  2,  1,  10,  JOF_BYTE|JOF_DETECTING)
OPDEF(JSOP_STRICTNE,  73, "strictne",   NULL,         1,  2,  1,  10,  JOF_BYTE|JOF_DETECTING)

/* Lexical closure constructor. */
OPDEF(JSOP_CLOSURE,   74, "closure",    NULL,         3,  0,  0,  0,  JOF_OBJECT)

/* Export and import ops. */
OPDEF(JSOP_EXPORTALL, 75, "exportall",  NULL,         1,  0,  0,  0,  JOF_BYTE)
OPDEF(JSOP_EXPORTNAME,76, "exportname", NULL,         3,  0,  0,  0,  JOF_ATOM|JOF_NAME)
OPDEF(JSOP_IMPORTALL, 77, "importall",  NULL,         1,  1,  0,  0,  JOF_BYTE)
OPDEF(JSOP_IMPORTPROP,78, "importprop", NULL,         3,  1,  0,  0,  JOF_ATOM|JOF_PROP|JOF_IMPORT)
OPDEF(JSOP_IMPORTELEM,79, "importelem", NULL,         1,  2,  0,  0,  JOF_BYTE |JOF_ELEM|JOF_IMPORT)

/* Push object literal. */
OPDEF(JSOP_OBJECT,    80, "object",     NULL,         3,  0,  1, 19,  JOF_OBJECT)

/* Pop value and discard it. */
OPDEF(JSOP_POP,       81, "pop",        NULL,         1,  1,  0,  2,  JOF_BYTE)

/* Convert value to number, for unary +. */
OPDEF(JSOP_POS,       82, "pos",        "+ ",         1,  1,  1, 15,  JOF_BYTE)

/* Trap into debugger for breakpoint, etc. */
OPDEF(JSOP_TRAP,      83, "trap",       NULL,         1,  0,  0,  0,  JOF_BYTE)

/* Fast get/set ops for function arguments and local variables. */
OPDEF(JSOP_GETARG,    84, "getarg",     NULL,         3,  0,  1, 19,  JOF_QARG |JOF_NAME)
OPDEF(JSOP_SETARG,    85, "setarg",     NULL,         3,  1,  1,  3,  JOF_QARG |JOF_NAME|JOF_SET)
OPDEF(JSOP_GETVAR,    86, "getvar",     NULL,         3,  0,  1, 19,  JOF_QVAR |JOF_NAME)
OPDEF(JSOP_SETVAR,    87, "setvar",     NULL,         3,  1,  1,  3,  JOF_QVAR |JOF_NAME|JOF_SET|JOF_DETECTING)

/* Push unsigned 16-bit int constant. */
OPDEF(JSOP_UINT16,    88, "uint16",     NULL,         3,  0,  1, 16,  JOF_UINT16)

/* Object and array literal support. */
OPDEF(JSOP_NEWINIT,   89, "newinit",    NULL,         2,  0,  1, 19,  JOF_INT8)
OPDEF(JSOP_ENDINIT,   90, "endinit",    NULL,         1,  0,  0, 19,  JOF_BYTE)
OPDEF(JSOP_INITPROP,  91, "initprop",   NULL,         3,  1,  0,  3,  JOF_ATOM|JOF_PROP|JOF_SET|JOF_DETECTING)
OPDEF(JSOP_INITELEM,  92, "initelem",   NULL,         1,  2,  0,  3,  JOF_BYTE |JOF_ELEM|JOF_SET|JOF_DETECTING)
OPDEF(JSOP_DEFSHARP,  93, "defsharp",   NULL,         3,  0,  0,  0,  JOF_UINT16)
OPDEF(JSOP_USESHARP,  94, "usesharp",   NULL,         3,  0,  1,  0,  JOF_UINT16)

/* Fast inc/dec ops for args and local vars. */
OPDEF(JSOP_INCARG,    95, "incarg",     NULL,         3,  0,  1, 15,  JOF_QARG |JOF_NAME|JOF_INC)
OPDEF(JSOP_INCVAR,    96, "incvar",     NULL,         3,  0,  1, 15,  JOF_QVAR |JOF_NAME|JOF_INC)
OPDEF(JSOP_DECARG,    97, "decarg",     NULL,         3,  0,  1, 15,  JOF_QARG |JOF_NAME|JOF_DEC)
OPDEF(JSOP_DECVAR,    98, "decvar",     NULL,         3,  0,  1, 15,  JOF_QVAR |JOF_NAME|JOF_DEC)
OPDEF(JSOP_ARGINC,    99, "arginc",     NULL,         3,  0,  1, 15,  JOF_QARG |JOF_NAME|JOF_INC|JOF_POST)
OPDEF(JSOP_VARINC,    100,"varinc",     NULL,         3,  0,  1, 15,  JOF_QVAR |JOF_NAME|JOF_INC|JOF_POST)
OPDEF(JSOP_ARGDEC,    101,"argdec",     NULL,         3,  0,  1, 15,  JOF_QARG |JOF_NAME|JOF_DEC|JOF_POST)
OPDEF(JSOP_VARDEC,    102,"vardec",     NULL,         3,  0,  1, 15,  JOF_QVAR |JOF_NAME|JOF_DEC|JOF_POST)

/*
 * Initialize for-in iterator. See also JSOP_FOREACH and JSOP_FOREACHKEYVAL.
 */
OPDEF(JSOP_FORIN,     103,"forin",      NULL,         1,  1,  1,  0,  JOF_BYTE)

/* ECMA-compliant for/in ops. */
OPDEF(JSOP_FORNAME,   104,"forname",    NULL,         3,  0,  1, 19,  JOF_ATOM|JOF_NAME|JOF_FOR)
OPDEF(JSOP_FORPROP,   105,"forprop",    NULL,         3,  1,  1, 18,  JOF_ATOM|JOF_PROP|JOF_FOR)
OPDEF(JSOP_FORELEM,   106,"forelem",    NULL,         1,  1,  3, 18,  JOF_BYTE |JOF_ELEM|JOF_FOR)
OPDEF(JSOP_POPN,      107,"popn",       NULL,         3, -1,  0,  0,  JOF_UINT16)

/* ECMA-compliant assignment ops. */
OPDEF(JSOP_BINDNAME,  108,"bindname",   NULL,         3,  0,  1,  0,  JOF_ATOM|JOF_NAME|JOF_SET)
OPDEF(JSOP_SETNAME,   109,"setname",    NULL,         3,  2,  1,  3,  JOF_ATOM|JOF_NAME|JOF_SET|JOF_DETECTING)

/* Exception handling ops. */
OPDEF(JSOP_THROW,     110,js_throw_str, NULL,         1,  1,  0,  0,  JOF_BYTE)

/* 'in' and 'instanceof' ops. */
OPDEF(JSOP_IN,        111,js_in_str,    js_in_str,    1,  2,  1, 11,  JOF_BYTE|JOF_LEFTASSOC)
OPDEF(JSOP_INSTANCEOF,112,js_instanceof_str,js_instanceof_str,1,2,1,11,JOF_BYTE|JOF_LEFTASSOC)

/* debugger op */
OPDEF(JSOP_DEBUGGER,  113,"debugger",   NULL,         1,  0,  0,  0,  JOF_BYTE)

/* gosub/retsub for finally handling */
OPDEF(JSOP_GOSUB,     114,"gosub",      NULL,         3,  0,  0,  0,  JOF_JUMP)
OPDEF(JSOP_RETSUB,    115,"retsub",     NULL,         1,  0,  0,  0,  JOF_BYTE)

/* More exception handling ops. */
OPDEF(JSOP_EXCEPTION, 116,"exception",  NULL,         1,  0,  1,  0,  JOF_BYTE)

/* Embedded lineno to speedup pc->line mapping. */
OPDEF(JSOP_LINENO, 117,"lineno",        NULL,         3,  0,  0,  0,  JOF_UINT16)

/*
 * ECMA-compliant switch statement ops.
 * CONDSWITCH is a decompilable NOP; CASE is ===, POP, jump if true, re-push
 * lval if false; and DEFAULT is POP lval and GOTO.
 */
OPDEF(JSOP_CONDSWITCH,118,"condswitch", NULL,         1,  0,  0,  0,  JOF_BYTE|JOF_PARENHEAD)
OPDEF(JSOP_CASE,      119,"case",       NULL,         3,  2,  1,  0,  JOF_JUMP)
OPDEF(JSOP_DEFAULT,   120,"default",    NULL,         3,  1,  0,  0,  JOF_JUMP)

/*
 * ECMA-compliant call to eval op
 */
OPDEF(JSOP_EVAL,      121,"eval",       NULL,         3, -1,  1, 18,  JOF_UINT16|JOF_INVOKE)

/*
 * ECMA-compliant helper for 'for (x[i] in o)' loops.
 */
OPDEF(JSOP_ENUMELEM,  122,"enumelem",   NULL,         1,  3,  0,  3,  JOF_BYTE |JOF_SET)

/*
 * Getter and setter prefix bytecodes.  These modify the next bytecode, either
 * an assignment or a property initializer code, which then defines a property
 * getter or setter.
 */
OPDEF(JSOP_GETTER,    123,js_getter_str,NULL,         1,  0,  0,  0,  JOF_BYTE)
OPDEF(JSOP_SETTER,    124,js_setter_str,NULL,         1,  0,  0,  0,  JOF_BYTE)

/*
 * Prolog bytecodes for defining function, var, and const names.
 */
OPDEF(JSOP_DEFFUN,    125,"deffun",     NULL,         3,  0,  0,  0,  JOF_OBJECT|JOF_DECLARING)
OPDEF(JSOP_DEFCONST,  126,"defconst",   NULL,         3,  0,  0,  0,  JOF_ATOM|JOF_DECLARING)
OPDEF(JSOP_DEFVAR,    127,"defvar",     NULL,         3,  0,  0,  0,  JOF_ATOM|JOF_DECLARING)

/* Auto-clone (if needed due to re-parenting) and push an anonymous function. */
OPDEF(JSOP_ANONFUNOBJ,  128, "anonfunobj",  NULL,     3,  0,  1, 19,  JOF_OBJECT)

/* ECMA ed. 3 named function expression. */
OPDEF(JSOP_NAMEDFUNOBJ, 129, "namedfunobj", NULL,     3,  0,  1, 19,  JOF_OBJECT)

/*
 * Like JSOP_SETLOCAL, but specialized to avoid requiring JSOP_POP immediately
 * after to throw away the exception value.
 */
OPDEF(JSOP_SETLOCALPOP, 130, "setlocalpop", NULL,     3,  1,  0,  3,  JOF_LOCAL|JOF_NAME|JOF_SET)

/* Parenthesization opcode to help the decompiler. */
OPDEF(JSOP_GROUP,       131, "group",       NULL,     1,  0,  0, 19,  JOF_BYTE)

/*
 * Host object extension: given 'o.item(i) = j', the left-hand side compiles
 * JSOP_SETCALL, rather than JSOP_CALL.
 */
OPDEF(JSOP_SETCALL,     132, "setcall",     NULL,     3, -1,  2, 18,  JOF_UINT16|JOF_SET)

/*
 * Exception handling no-ops, for more economical byte-coding than SRC_TRYFIN
 * srcnote-annotated JSOP_NOPs.
 */
OPDEF(JSOP_TRY,         133,"try",        NULL,       1,  0,  0,  0,  JOF_BYTE)
OPDEF(JSOP_FINALLY,     134,"finally",    NULL,       1,  0,  0,  0,  JOF_BYTE)

/*
 * Swap the top two stack elements.
 */
OPDEF(JSOP_SWAP,        135,"swap",       NULL,       1,  2,  2,  0,  JOF_BYTE)

/*
 * Bytecodes that avoid making an arguments object in most cases:
 * JSOP_ARGSUB gets arguments[i] from fp->argv, iff i is in [0, fp->argc-1].
 * JSOP_ARGCNT returns fp->argc.
 */
OPDEF(JSOP_ARGSUB,      136,"argsub",     NULL,       3,  0,  1, 18,  JOF_QARG |JOF_NAME)
OPDEF(JSOP_ARGCNT,      137,"argcnt",     NULL,       1,  0,  1, 18,  JOF_BYTE)

/*
 * Define a local function object as a local variable.
 * The local variable's slot number is the first immediate two-byte operand.
 * The function object's atom index is the second immediate operand.
 */
OPDEF(JSOP_DEFLOCALFUN, 138,"deflocalfun",NULL,       5,  0,  0,  0,  JOF_SLOTOBJECT|JOF_DECLARING)

/* Extended jumps. */
OPDEF(JSOP_GOTOX,         139,"gotox",    NULL,       5,  0,  0,  0,  JOF_JUMPX)
OPDEF(JSOP_IFEQX,         140,"ifeqx",    NULL,       5,  1,  0,  4,  JOF_JUMPX|JOF_DETECTING)
OPDEF(JSOP_IFNEX,         141,"ifnex",    NULL,       5,  1,  0,  0,  JOF_JUMPX|JOF_PARENHEAD)
OPDEF(JSOP_ORX,           142,"orx",      NULL,       5,  1,  0,  5,  JOF_JUMPX|JOF_DETECTING)
OPDEF(JSOP_ANDX,          143,"andx",     NULL,       5,  1,  0,  6,  JOF_JUMPX|JOF_DETECTING)
OPDEF(JSOP_GOSUBX,        144,"gosubx",   NULL,       5,  0,  0,  0,  JOF_JUMPX)
OPDEF(JSOP_CASEX,         145,"casex",    NULL,       5,  2,  1,  0,  JOF_JUMPX)
OPDEF(JSOP_DEFAULTX,      146,"defaultx", NULL,       5,  1,  0,  0,  JOF_JUMPX)
OPDEF(JSOP_TABLESWITCHX,  147,"tableswitchx",NULL,   -1,  1,  0,  0,  JOF_TABLESWITCHX|JOF_DETECTING|JOF_PARENHEAD)
OPDEF(JSOP_LOOKUPSWITCHX, 148,"lookupswitchx",NULL,  -1,  1,  0,  0,  JOF_LOOKUPSWITCHX|JOF_DETECTING|JOF_PARENHEAD)

/* Placeholders for a real jump opcode set during backpatch chain fixup. */
OPDEF(JSOP_BACKPATCH,     149,"backpatch",NULL,       3,  0,  0,  0,  JOF_JUMP|JOF_BACKPATCH)
OPDEF(JSOP_BACKPATCH_POP, 150,"backpatch_pop",NULL,   3,  1,  0,  0,  JOF_JUMP|JOF_BACKPATCH)

/* Set pending exception from the stack, to trigger rethrow. */
OPDEF(JSOP_THROWING,      151,"throwing", NULL,       1,  1,  0,  0,  JOF_BYTE)

/* Set and get return value pseudo-register in stack frame. */
OPDEF(JSOP_SETRVAL,       152,"setrval",  NULL,       1,  1,  0,  2,  JOF_BYTE)
OPDEF(JSOP_RETRVAL,       153,"retrval",  NULL,       1,  0,  0,  0,  JOF_BYTE)

/* Optimized global variable ops (we don't bother doing a JSOP_FORGVAR op). */
OPDEF(JSOP_GETGVAR,       154,"getgvar",  NULL,       3,  0,  1, 19,  JOF_ATOM|JOF_NAME)
OPDEF(JSOP_SETGVAR,       155,"setgvar",  NULL,       3,  1,  1,  3,  JOF_ATOM|JOF_NAME|JOF_SET|JOF_DETECTING)
OPDEF(JSOP_INCGVAR,       156,"incgvar",  NULL,       3,  0,  1, 15,  JOF_ATOM|JOF_NAME|JOF_INC|JOF_TMPSLOT2)
OPDEF(JSOP_DECGVAR,       157,"decgvar",  NULL,       3,  0,  1, 15,  JOF_ATOM|JOF_NAME|JOF_DEC|JOF_TMPSLOT2)
OPDEF(JSOP_GVARINC,       158,"gvarinc",  NULL,       3,  0,  1, 15,  JOF_ATOM|JOF_NAME|JOF_INC|JOF_POST|JOF_TMPSLOT2)
OPDEF(JSOP_GVARDEC,       159,"gvardec",  NULL,       3,  0,  1, 15,  JOF_ATOM|JOF_NAME|JOF_DEC|JOF_POST|JOF_TMPSLOT2)

/* Regular expression literal requiring special "fork on exec" handling. */
OPDEF(JSOP_REGEXP,        160,"regexp",   NULL,       3,  0,  1, 19,  JOF_REGEXP)

/* XML (ECMA-357, a.k.a. "E4X") support. */
OPDEF(JSOP_DEFXMLNS,      161,"defxmlns",   NULL,     1,  1,  0,  0,  JOF_BYTE)
OPDEF(JSOP_ANYNAME,       162,"anyname",    NULL,     1,  0,  1, 19,  JOF_BYTE|JOF_XMLNAME)
OPDEF(JSOP_QNAMEPART,     163,"qnamepart",  NULL,     3,  0,  1, 19,  JOF_ATOM|JOF_XMLNAME)
OPDEF(JSOP_QNAMECONST,    164,"qnameconst", NULL,     3,  1,  1, 19,  JOF_ATOM|JOF_XMLNAME)
OPDEF(JSOP_QNAME,         165,"qname",      NULL,     1,  2,  1,  0,  JOF_BYTE|JOF_XMLNAME)
OPDEF(JSOP_TOATTRNAME,    166,"toattrname", NULL,     1,  1,  1, 19,  JOF_BYTE|JOF_XMLNAME)
OPDEF(JSOP_TOATTRVAL,     167,"toattrval",  NULL,     1,  1,  1, 19,  JOF_BYTE)
OPDEF(JSOP_ADDATTRNAME,   168,"addattrname",NULL,     1,  2,  1, 13,  JOF_BYTE)
OPDEF(JSOP_ADDATTRVAL,    169,"addattrval", NULL,     1,  2,  1, 13,  JOF_BYTE)
OPDEF(JSOP_BINDXMLNAME,   170,"bindxmlname",NULL,     1,  1,  2,  3,  JOF_BYTE|JOF_SET)
OPDEF(JSOP_SETXMLNAME,    171,"setxmlname", NULL,     1,  3,  1,  3,  JOF_BYTE|JOF_SET|JOF_DETECTING)
OPDEF(JSOP_XMLNAME,       172,"xmlname",    NULL,     1,  1,  1, 19,  JOF_BYTE)
OPDEF(JSOP_DESCENDANTS,   173,"descendants",NULL,     1,  2,  1, 18,  JOF_BYTE)
OPDEF(JSOP_FILTER,        174,"filter",     NULL,     3,  1,  1,  0,  JOF_JUMP)
OPDEF(JSOP_ENDFILTER,     175,"endfilter",  NULL,     3,  2,  1, 18,  JOF_JUMP)
OPDEF(JSOP_TOXML,         176,"toxml",      NULL,     1,  1,  1, 19,  JOF_BYTE)
OPDEF(JSOP_TOXMLLIST,     177,"toxmllist",  NULL,     1,  1,  1, 19,  JOF_BYTE)
OPDEF(JSOP_XMLTAGEXPR,    178,"xmltagexpr", NULL,     1,  1,  1,  0,  JOF_BYTE)
OPDEF(JSOP_XMLELTEXPR,    179,"xmleltexpr", NULL,     1,  1,  1,  0,  JOF_BYTE)
OPDEF(JSOP_XMLOBJECT,     180,"xmlobject",  NULL,     3,  0,  1, 19,  JOF_OBJECT)
OPDEF(JSOP_XMLCDATA,      181,"xmlcdata",   NULL,     3,  0,  1, 19,  JOF_ATOM)
OPDEF(JSOP_XMLCOMMENT,    182,"xmlcomment", NULL,     3,  0,  1, 19,  JOF_ATOM)
OPDEF(JSOP_XMLPI,         183,"xmlpi",      NULL,     3,  1,  1, 19,  JOF_ATOM)
OPDEF(JSOP_CALLPROP,      184,"callprop",   NULL,     3,  1,  2, 18,  JOF_ATOM|JOF_PROP|JOF_CALLOP)
OPDEF(JSOP_GETFUNNS,      185,"getfunns",   NULL,     1,  0,  1, 19,  JOF_BYTE)
OPDEF(JSOP_FOREACH,       186,"foreach",    NULL,     1,  1,  1,  0,  JOF_BYTE)
OPDEF(JSOP_DELDESC,       187,"deldesc",    NULL,     1,  2,  1, 17,  JOF_BYTE |JOF_ELEM|JOF_DEL)

/*
 * Opcode to hold 24-bit immediate integer operands.
 */
OPDEF(JSOP_UINT24,        188,"uint24",     NULL,     4,  0,  1, 16,  JOF_UINT24)

/*
 * Opcodes to allow 24-bit atom or object indexes. Whenever an index exceeds
 * the 16-bit limit, the index-accessing bytecode must be bracketed by
 * JSOP_INDEXBASE and JSOP_RESETBASE to provide the upper bits of the index.
 * See jsemit.c, EmitIndexOp.
 */
OPDEF(JSOP_INDEXBASE,     189,"atombase",   NULL,     2,  0,  0,  0,  JOF_2BYTE|JOF_INDEXBASE)
OPDEF(JSOP_RESETBASE,     190,"resetbase",  NULL,     1,  0,  0,  0,  JOF_BYTE)
OPDEF(JSOP_RESETBASE0,    191,"resetbase0", NULL,     1,  0,  0,  0,  JOF_BYTE)

/*
 * Opcodes to help the decompiler deal with XML.
 */
OPDEF(JSOP_STARTXML,      192,"startxml",    NULL,    1,  0,  0,  0,  JOF_BYTE)
OPDEF(JSOP_STARTXMLEXPR,  193,"startxmlexpr",NULL,    1,  0,  0,  0,  JOF_BYTE)

OPDEF(JSOP_CALLELEM,      194, "callelem",   NULL,    1,  2,  2, 18,  JOF_BYTE |JOF_ELEM|JOF_LEFTASSOC|JOF_CALLOP)

/*
 * Stop interpretation, emitted at end of script to save the threaded bytecode
 * interpreter an extra branch test on every DO_NEXT_OP (see jsinterp.c).
 */
OPDEF(JSOP_STOP,          195,"stop",        NULL,    1,  0,  0,  0,  JOF_BYTE)

/*
 * Get an extant property value, throwing ReferenceError if the identified
 * property does not exist.
 */
OPDEF(JSOP_GETXPROP,      196,"getxprop",    NULL,    3,  1,  1, 18,  JOF_ATOM|JOF_PROP)

OPDEF(JSOP_CALLXMLNAME,   197, "callxmlname",  NULL,  1,  1,  2, 19,  JOF_BYTE|JOF_CALLOP)

/*
 * Specialized JSOP_TYPEOF to avoid reporting undefined for typeof(0, undef).
 */
OPDEF(JSOP_TYPEOFEXPR,    198,"typeofexpr",  NULL,    1,  1,  1, 15,  JOF_BYTE|JOF_DETECTING)

/*
 * Block-local scope support.
 */
OPDEF(JSOP_ENTERBLOCK,    199,"enterblock",  NULL,    3,  0,  0,  0,  JOF_OBJECT)
OPDEF(JSOP_LEAVEBLOCK,    200,"leaveblock",  NULL,    3,  0,  0,  0,  JOF_UINT16)
OPDEF(JSOP_GETLOCAL,      201,"getlocal",    NULL,    3,  0,  1, 19,  JOF_LOCAL|JOF_NAME)
OPDEF(JSOP_SETLOCAL,      202,"setlocal",    NULL,    3,  1,  1,  3,  JOF_LOCAL|JOF_NAME|JOF_SET)
OPDEF(JSOP_INCLOCAL,      203,"inclocal",    NULL,    3,  0,  1, 15,  JOF_LOCAL|JOF_NAME|JOF_INC)
OPDEF(JSOP_DECLOCAL,      204,"declocal",    NULL,    3,  0,  1, 15,  JOF_LOCAL|JOF_NAME|JOF_DEC)
OPDEF(JSOP_LOCALINC,      205,"localinc",    NULL,    3,  0,  1, 15,  JOF_LOCAL|JOF_NAME|JOF_INC|JOF_POST)
OPDEF(JSOP_LOCALDEC,      206,"localdec",    NULL,    3,  0,  1, 15,  JOF_LOCAL|JOF_NAME|JOF_DEC|JOF_POST)
OPDEF(JSOP_FORLOCAL,      207,"forlocal",    NULL,    3,  0,  1, 19,  JOF_LOCAL|JOF_NAME|JOF_FOR)

/*
 * Iterator, generator, and array comprehension support.
 */
OPDEF(JSOP_FORCONST,      208,"forconst",    NULL,    3,  0,  1, 19,  JOF_QVAR|JOF_NAME|JOF_FOR)
OPDEF(JSOP_ENDITER,       209,"enditer",     NULL,    1,  1,  0,  0,  JOF_BYTE|JOF_TMPSLOT)
OPDEF(JSOP_GENERATOR,     210,"generator",   NULL,    1,  0,  0,  0,  JOF_BYTE)
OPDEF(JSOP_YIELD,         211,"yield",       NULL,    1,  1,  1,  1,  JOF_BYTE)
OPDEF(JSOP_ARRAYPUSH,     212,"arraypush",   NULL,    3,  1,  0,  3,  JOF_LOCAL)

OPDEF(JSOP_FOREACHKEYVAL, 213,"foreachkeyval",NULL,   1,  1,  1,  0,  JOF_BYTE)

/*
 * Variant of JSOP_ENUMELEM for destructuring const (const [a, b] = ...).
 */
OPDEF(JSOP_ENUMCONSTELEM, 214,"enumconstelem",NULL,   1,  3,  0,  3,  JOF_BYTE|JOF_SET)

/*
 * Variant of JSOP_LEAVEBLOCK has a result on the stack above the locals,
 * which must be moved down when the block pops.
 */
OPDEF(JSOP_LEAVEBLOCKEXPR,215,"leaveblockexpr",NULL,  3,  0,  0,  1,  JOF_UINT16)

/*
 * Optimize common JSOP_{THIS,GET{ARG,VAR,LOCAL}} -> JSOP_GETPROP cliches.
 */
OPDEF(JSOP_GETTHISPROP,   216,"getthisprop",   NULL,  3,  0,  1, 18,  JOF_ATOM|JOF_VARPROP)
OPDEF(JSOP_GETARGPROP,    217,"getargprop",    NULL,  5,  0,  1, 18,  JOF_SLOTATOM|JOF_VARPROP)
OPDEF(JSOP_GETVARPROP,    218,"getvarprop",    NULL,  5,  0,  1, 18,  JOF_SLOTATOM|JOF_VARPROP)
OPDEF(JSOP_GETLOCALPROP,  219,"getlocalprop",  NULL,  5,  0,  1, 18,  JOF_SLOTATOM|JOF_VARPROP)

/*
 * Optimize atom segments 1-3.  These must be followed by JSOP_RESETBASE0 after
 * the opcode that they prefix.
 */
OPDEF(JSOP_INDEXBASE1,    220,"atombase1",     NULL,  1,  0,  0,  0,  JOF_BYTE |JOF_INDEXBASE)
OPDEF(JSOP_INDEXBASE2,    221,"atombase2",     NULL,  1,  0,  0,  0,  JOF_BYTE |JOF_INDEXBASE)
OPDEF(JSOP_INDEXBASE3,    222,"atombase3",     NULL,  1,  0,  0,  0,  JOF_BYTE |JOF_INDEXBASE)

OPDEF(JSOP_CALLGVAR,      223, "callgvar",     NULL,  3,  0,  2, 19,  JOF_ATOM|JOF_NAME|JOF_CALLOP)
OPDEF(JSOP_CALLVAR,       224, "callvar",      NULL,  3,  0,  2, 19,  JOF_QVAR |JOF_NAME|JOF_CALLOP)
OPDEF(JSOP_CALLARG,       225, "callarg",      NULL,  3,  0,  2, 19,  JOF_QARG |JOF_NAME|JOF_CALLOP)
OPDEF(JSOP_CALLLOCAL,     226, "calllocal",    NULL,  3,  0,  2, 19,  JOF_LOCAL|JOF_NAME|JOF_CALLOP)

/*
 * Opcodes to hold 8-bit and 32-bit immediate integer operands.
 */
OPDEF(JSOP_INT8,          227, "int8",         NULL,  2,  0,  1, 16,  JOF_INT8)
OPDEF(JSOP_INT32,         228, "int32",        NULL,  5,  0,  1, 16,  JOF_INT32)

/*
 * Get the value of the 'length' property from a stacked object.
 */
OPDEF(JSOP_LENGTH,        229, "length",       NULL,  1,  1,  1, 18,  JOF_BYTE|JOF_PROP)
