diff --git a/config/check_spidermonkey_style.py b/config/check_spidermonkey_style.py
index f4ad12fece79..23b65f71f039 100644
--- a/config/check_spidermonkey_style.py
+++ b/config/check_spidermonkey_style.py
@@ -63,7 +63,6 @@ included_inclnames_to_ignore = set([
     'double-conversion.h',      # strange MFBT case
     'javascript-trace.h',       # generated in $OBJDIR if HAVE_DTRACE is defined
     'jsautokw.h',               # generated in $OBJDIR
-    'jsautooplen.h',            # generated in $OBJDIR
     'jscustomallocator.h',      # provided by embedders;  allowed to be missing
     'js-config.h',              # generated in $OBJDIR
     'pratom.h',                 # NSPR
diff --git a/js/src/Makefile.in b/js/src/Makefile.in
index 68f72d85981c..e04caccf7003 100644
--- a/js/src/Makefile.in
+++ b/js/src/Makefile.in
@@ -63,8 +63,6 @@ EXTRA_DSO_LDOPTS += $(NSPR_LIBS)
 
 GARBAGE += jsautokw.h host_jskwgen$(HOST_BIN_SUFFIX)
 
-GARBAGE += jsautooplen.h host_jsoplengen$(HOST_BIN_SUFFIX)
-
 GARBAGE += selfhosted.out.h
 
 USE_HOST_CXX = 1
@@ -408,13 +406,8 @@ endif
 $(CURDIR)/jsautokw.h: host_jskwgen$(HOST_BIN_SUFFIX)
 	./host_jskwgen$(HOST_BIN_SUFFIX) $@
 
-# Use CURDIR to avoid finding a jsautooplen.h in the source tree (from
-# a previous build?) via VPATH when we're building in a separate tree.
-$(CURDIR)/jsautooplen.h: host_jsoplengen$(HOST_BIN_SUFFIX)
-	./host_jsoplengen$(HOST_BIN_SUFFIX) $@
-
 # Force auto-header generation before compiling any source that may use them
-$(OBJS): $(CURDIR)/jsautokw.h $(CURDIR)/jsautooplen.h
+$(OBJS): $(CURDIR)/jsautokw.h
 
 ifdef MOZ_ETW
 ETWProvider.h ETWProvider.rc ETWProvider.mof: ETWProvider.man
diff --git a/js/src/frontend/BytecodeEmitter.cpp b/js/src/frontend/BytecodeEmitter.cpp
index 2a59d5e99818..232526a0bbfa 100644
--- a/js/src/frontend/BytecodeEmitter.cpp
+++ b/js/src/frontend/BytecodeEmitter.cpp
@@ -18,7 +18,6 @@
 
 #include "jsapi.h"
 #include "jsatom.h"
-#include "jsautooplen.h"
 #include "jscntxt.h"
 #include "jsfun.h"
 #include "jsnum.h"
diff --git a/js/src/jit/BaselineIC.cpp b/js/src/jit/BaselineIC.cpp
index ae34d64bb716..5aa54736fd5a 100644
--- a/js/src/jit/BaselineIC.cpp
+++ b/js/src/jit/BaselineIC.cpp
@@ -9,7 +9,6 @@
 #include "mozilla/DebugOnly.h"
 #include "mozilla/TemplateLib.h"
 
-#include "jsautooplen.h"
 #include "jslibmath.h"
 #include "jstypes.h"
 
@@ -23,6 +22,7 @@
 # include "jit/PerfSpewer.h"
 #endif
 #include "jit/VMFunctions.h"
+#include "vm/Opcodes.h"
 
 #include "jsboolinlines.h"
 #include "jsscriptinlines.h"
diff --git a/js/src/jit/IonBuilder.cpp b/js/src/jit/IonBuilder.cpp
index d1dc301e700d..2c8344f98548 100644
--- a/js/src/jit/IonBuilder.cpp
+++ b/js/src/jit/IonBuilder.cpp
@@ -8,8 +8,6 @@
 
 #include "mozilla/DebugOnly.h"
 
-#include "jsautooplen.h"
-
 #include "builtin/Eval.h"
 #include "builtin/TypedObject.h"
 #include "builtin/TypeRepresentation.h"
@@ -22,8 +20,8 @@
 #include "jit/IonSpewer.h"
 #include "jit/Lowering.h"
 #include "jit/MIRGraph.h"
-
 #include "vm/ArgumentsObject.h"
+#include "vm/Opcodes.h"
 #include "vm/RegExpStatics.h"
 
 #include "jsinferinlines.h"
diff --git a/js/src/jsanalyze.cpp b/js/src/jsanalyze.cpp
index 9ddcc1d50307..0a7c28f93173 100644
--- a/js/src/jsanalyze.cpp
+++ b/js/src/jsanalyze.cpp
@@ -8,10 +8,11 @@
 #include "mozilla/MathAlgorithms.h"
 #include "mozilla/PodOperations.h"
 
-#include "jsautooplen.h"
 #include "jscntxt.h"
 #include "jscompartment.h"
 
+#include "vm/Opcodes.h"
+
 #include "jsinferinlines.h"
 #include "jsobjinlines.h"
 #include "jsopcodeinlines.h"
diff --git a/js/src/jsarray.cpp b/js/src/jsarray.cpp
index 26add9393b3f..6f49f78c884f 100644
--- a/js/src/jsarray.cpp
+++ b/js/src/jsarray.cpp
@@ -13,7 +13,6 @@
 
 #include "jsapi.h"
 #include "jsatom.h"
-#include "jsautooplen.h"
 #include "jscntxt.h"
 #include "jsfriendapi.h"
 #include "jsfun.h"
diff --git a/js/src/jsinfer.cpp b/js/src/jsinfer.cpp
index 7844f359c211..4a2d8e229563 100644
--- a/js/src/jsinfer.cpp
+++ b/js/src/jsinfer.cpp
@@ -11,7 +11,6 @@
 #include "mozilla/PodOperations.h"
 
 #include "jsapi.h"
-#include "jsautooplen.h"
 #include "jscntxt.h"
 #include "jsgc.h"
 #include "jshashutil.h"
@@ -30,6 +29,7 @@
 #include "jit/JitCompartment.h"
 #endif
 #include "js/MemoryMetrics.h"
+#include "vm/Opcodes.h"
 #include "vm/Shape.h"
 
 #include "jsatominlines.h"
diff --git a/js/src/jsopcode.cpp b/js/src/jsopcode.cpp
index 5d14c50e749c..694334e81f91 100644
--- a/js/src/jsopcode.cpp
+++ b/js/src/jsopcode.cpp
@@ -18,7 +18,6 @@
 #include "jsanalyze.h"
 #include "jsapi.h"
 #include "jsatom.h"
-#include "jsautooplen.h"
 #include "jscntxt.h"
 #include "jscompartment.h"
 #include "jsfun.h"
@@ -33,6 +32,7 @@
 #include "frontend/BytecodeCompiler.h"
 #include "frontend/SourceNotes.h"
 #include "js/CharacterEncoding.h"
+#include "vm/Opcodes.h"
 #include "vm/ScopeObject.h"
 #include "vm/Shape.h"
 #include "vm/StringBuffer.h"
@@ -53,17 +53,10 @@ using js::frontend::IsIdentifier;
  */
 JS_STATIC_ASSERT(sizeof(uint32_t) * JS_BITS_PER_BYTE >= INDEX_LIMIT_LOG2 + 1);
 
-/* Verify JSOP_XXX_LENGTH constant definitions. */
-#define OPDEF(op,val,name,token,length,nuses,ndefs,format)               \
-    JS_STATIC_ASSERT(op##_LENGTH == length);
-#include "jsopcode.tbl"
-#undef OPDEF
-
 const JSCodeSpec js_CodeSpec[] = {
-#define OPDEF(op,val,name,token,length,nuses,ndefs,format) \
-    {length,nuses,ndefs,format},
-#include "jsopcode.tbl"
-#undef OPDEF
+#define MAKE_CODESPEC(op,val,name,token,length,nuses,ndefs,format)  {length,nuses,ndefs,format},
+    FOR_EACH_OPCODE(MAKE_CODESPEC)
+#undef MAKE_CODESPEC
 };
 
 const unsigned js_NumCodeSpecs = JS_ARRAY_LENGTH(js_CodeSpec);
@@ -73,10 +66,9 @@ const unsigned js_NumCodeSpecs = JS_ARRAY_LENGTH(js_CodeSpec);
  * bytecode or null.
  */
 static const char * const CodeToken[] = {
-#define OPDEF(op,val,name,token,length,nuses,ndefs,format) \
-    token,
-#include "jsopcode.tbl"
-#undef OPDEF
+#define TOKEN(op, val, name, token, ...)  token,
+    FOR_EACH_OPCODE(TOKEN)
+#undef TOKEN
 };
 
 /*
@@ -84,10 +76,9 @@ static const char * const CodeToken[] = {
  * and JIT debug spew.
  */
 const char * const js_CodeName[] = {
-#define OPDEF(op,val,name,token,length,nuses,ndefs,format) \
-    name,
-#include "jsopcode.tbl"
-#undef OPDEF
+#define OPNAME(op, val, name, ...)  name,
+    FOR_EACH_OPCODE(OPNAME)
+#undef OPNAME
 };
 
 /************************************************************************/
diff --git a/js/src/jsopcode.h b/js/src/jsopcode.h
index ec7990c393e9..f9f6244ba287 100644
--- a/js/src/jsopcode.h
+++ b/js/src/jsopcode.h
@@ -16,15 +16,16 @@
 #include "NamespaceImports.h"
 
 #include "frontend/SourceNotes.h"
+#include "vm/Opcodes.h"
 
 /*
  * JS operation bytecodes.
  */
 typedef enum JSOp {
-#define OPDEF(op,val,name,token,length,nuses,ndefs,format) \
-    op = val,
-#include "jsopcode.tbl"
-#undef OPDEF
+#define ENUMERATE_OPCODE(op, val, ...) op = val,
+FOR_EACH_OPCODE(ENUMERATE_OPCODE)
+#undef ENUMERATE_OPCODE
+
     JSOP_LIMIT,
 
     /*
diff --git a/js/src/jsopcode.tbl b/js/src/jsopcode.tbl
deleted file mode 100644
index 3fc668ae23eb..000000000000
--- a/js/src/jsopcode.tbl
+++ /dev/null
@@ -1,530 +0,0 @@
-/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
- * vim: set ts=8 sw=4 et tw=0 ft=c:
- *
- * This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-/*
- * 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.
- *
- * When changing the bytecode, don't forget to update XDR_BYTECODE_VERSION in
- * vm/Xdr.h!
- *
- * 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, -1 if variadic
- * format       Bytecode plus immediate operand encoding format
- *
- * This file is best viewed with 128 columns:
-12345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678
- */
-
-/* legend: op         val name          image       len use def  format */
-
-/*
- * Generic nop for the decompiler.
- */
-OPDEF(JSOP_NOP,       0,  "nop",        NULL,         1,  0,  0, JOF_BYTE)
-
-/* Long-standing JavaScript bytecodes. */
-OPDEF(JSOP_UNDEFINED, 1,  js_undefined_str, "",       1,  0,  1, JOF_BYTE)
-OPDEF(JSOP_UNUSED2,   2,  "unused2",    NULL,         1,  1,  0, JOF_BYTE)
-OPDEF(JSOP_ENTERWITH, 3,  "enterwith",  NULL,         1,  1,  1, JOF_BYTE)
-OPDEF(JSOP_LEAVEWITH, 4,  "leavewith",  NULL,         1,  1,  0, JOF_BYTE)
-OPDEF(JSOP_RETURN,    5,  "return",     NULL,         1,  1,  0, JOF_BYTE)
-OPDEF(JSOP_GOTO,      6,  "goto",       NULL,         5,  0,  0, JOF_JUMP)
-OPDEF(JSOP_IFEQ,      7,  "ifeq",       NULL,         5,  1,  0, JOF_JUMP|JOF_DETECTING)
-OPDEF(JSOP_IFNE,      8,  "ifne",       NULL,         5,  1,  0, JOF_JUMP)
-
-/* Get the arguments object for the current, lightweight function activation. */
-OPDEF(JSOP_ARGUMENTS, 9,  "arguments",  NULL,         1,  0,  1, JOF_BYTE)
-
-OPDEF(JSOP_SWAP,      10, "swap",       NULL,         1,  2,  2, JOF_BYTE)
-OPDEF(JSOP_POPN,      11, "popn",       NULL,         3, -1,  0, JOF_UINT16)
-
-/* More long-standing bytecodes. */
-OPDEF(JSOP_DUP,       12, "dup",        NULL,         1,  1,  2, JOF_BYTE)
-OPDEF(JSOP_DUP2,      13, "dup2",       NULL,         1,  2,  4, JOF_BYTE)
-OPDEF(JSOP_SETCONST,  14, "setconst",   NULL,         5,  1,  1, JOF_ATOM|JOF_NAME|JOF_SET)
-OPDEF(JSOP_BITOR,     15, "bitor",      "|",          1,  2,  1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH)
-OPDEF(JSOP_BITXOR,    16, "bitxor",     "^",          1,  2,  1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH)
-OPDEF(JSOP_BITAND,    17, "bitand",     "&",          1,  2,  1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH)
-OPDEF(JSOP_EQ,        18, "eq",         "==",         1,  2,  1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH|JOF_DETECTING)
-OPDEF(JSOP_NE,        19, "ne",         "!=",         1,  2,  1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH|JOF_DETECTING)
-OPDEF(JSOP_LT,        20, "lt",         "<",          1,  2,  1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH)
-OPDEF(JSOP_LE,        21, "le",         "<=",         1,  2,  1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH)
-OPDEF(JSOP_GT,        22, "gt",         ">",          1,  2,  1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH)
-OPDEF(JSOP_GE,        23, "ge",         ">=",         1,  2,  1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH)
-OPDEF(JSOP_LSH,       24, "lsh",        "<<",         1,  2,  1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH)
-OPDEF(JSOP_RSH,       25, "rsh",        ">>",         1,  2,  1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH)
-OPDEF(JSOP_URSH,      26, "ursh",       ">>>",        1,  2,  1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH)
-OPDEF(JSOP_ADD,       27, "add",        "+",          1,  2,  1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH)
-OPDEF(JSOP_SUB,       28, "sub",        "-",          1,  2,  1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH)
-OPDEF(JSOP_MUL,       29, "mul",        "*",          1,  2,  1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH)
-OPDEF(JSOP_DIV,       30, "div",        "/",          1,  2,  1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH)
-OPDEF(JSOP_MOD,       31, "mod",        "%",          1,  2,  1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH)
-OPDEF(JSOP_NOT,       32, "not",        "!",          1,  1,  1, JOF_BYTE|JOF_ARITH|JOF_DETECTING)
-OPDEF(JSOP_BITNOT,    33, "bitnot",     "~",          1,  1,  1, JOF_BYTE|JOF_ARITH)
-OPDEF(JSOP_NEG,       34, "neg",        "- ",         1,  1,  1, JOF_BYTE|JOF_ARITH)
-OPDEF(JSOP_POS,       35, "pos",        "+ ",         1,  1,  1, JOF_BYTE|JOF_ARITH)
-OPDEF(JSOP_DELNAME,   36, "delname",    NULL,         5,  0,  1, JOF_ATOM|JOF_NAME)
-OPDEF(JSOP_DELPROP,   37, "delprop",    NULL,         5,  1,  1, JOF_ATOM|JOF_PROP)
-OPDEF(JSOP_DELELEM,   38, "delelem",    NULL,         1,  2,  1, JOF_BYTE |JOF_ELEM)
-OPDEF(JSOP_TYPEOF,    39, js_typeof_str,NULL,         1,  1,  1, JOF_BYTE|JOF_DETECTING)
-OPDEF(JSOP_VOID,      40, js_void_str,  NULL,         1,  1,  1, JOF_BYTE)
-
-/* spreadcall variant of JSOP_CALL */
-OPDEF(JSOP_SPREADCALL,41, "spreadcall", NULL,         1,  3,  1, JOF_BYTE|JOF_INVOKE|JOF_TYPESET)
-/* spreadcall variant of JSOP_NEW */
-OPDEF(JSOP_SPREADNEW, 42, "spreadnew",  NULL,         1,  3,  1, JOF_BYTE|JOF_INVOKE|JOF_TYPESET)
-/* spreadcall variant of JSOP_EVAL */
-OPDEF(JSOP_SPREADEVAL,43, "spreadeval", NULL,         1,  3,  1, JOF_BYTE|JOF_INVOKE|JOF_TYPESET)
-
-/* Pop N values, preserving top value.  */
-OPDEF(JSOP_POPNV,     44, "popnv",      NULL,         3, -1,  1,  JOF_UINT16)
-
-OPDEF(JSOP_UNUSED45,  45, "unused45",   NULL,         1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED46,  46, "unused46",   NULL,         1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED47,  47, "unused47",   NULL,         1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED48,  48, "unused48",   NULL,         1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED49,  49, "unused49",   NULL,         1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED50,  50, "unused50",   NULL,         1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED51,  51, "unused51",   NULL,         1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED52,  52, "unused52",   NULL,         1,  0,  0,  JOF_BYTE)
-
-OPDEF(JSOP_GETPROP,   53, "getprop",    NULL,         5,  1,  1, JOF_ATOM|JOF_PROP|JOF_TYPESET|JOF_TMPSLOT3)
-OPDEF(JSOP_SETPROP,   54, "setprop",    NULL,         5,  2,  1, JOF_ATOM|JOF_PROP|JOF_SET|JOF_DETECTING|JOF_TMPSLOT)
-OPDEF(JSOP_GETELEM,   55, "getelem",    NULL,         1,  2,  1, JOF_BYTE |JOF_ELEM|JOF_TYPESET|JOF_LEFTASSOC)
-OPDEF(JSOP_SETELEM,   56, "setelem",    NULL,         1,  3,  1, JOF_BYTE |JOF_ELEM|JOF_SET|JOF_DETECTING)
-OPDEF(JSOP_CALLNAME,  57, "callname",   NULL,         5,  0,  1, JOF_ATOM|JOF_NAME|JOF_TYPESET)
-OPDEF(JSOP_CALL,      58, "call",       NULL,         3, -1,  1, JOF_UINT16|JOF_INVOKE|JOF_TYPESET)
-OPDEF(JSOP_NAME,      59, "name",       NULL,         5,  0,  1, JOF_ATOM|JOF_NAME|JOF_TYPESET)
-OPDEF(JSOP_DOUBLE,    60, "double",     NULL,         5,  0,  1, JOF_DOUBLE)
-OPDEF(JSOP_STRING,    61, "string",     NULL,         5,  0,  1, JOF_ATOM)
-OPDEF(JSOP_ZERO,      62, "zero",       "0",          1,  0,  1, JOF_BYTE)
-OPDEF(JSOP_ONE,       63, "one",        "1",          1,  0,  1, JOF_BYTE)
-OPDEF(JSOP_NULL,      64, js_null_str,  js_null_str,  1,  0,  1, JOF_BYTE)
-OPDEF(JSOP_THIS,      65, js_this_str,  js_this_str,  1,  0,  1, JOF_BYTE)
-OPDEF(JSOP_FALSE,     66, js_false_str, js_false_str, 1,  0,  1, JOF_BYTE)
-OPDEF(JSOP_TRUE,      67, js_true_str,  js_true_str,  1,  0,  1, JOF_BYTE)
-OPDEF(JSOP_OR,        68, "or",         NULL,         5,  1,  1, JOF_JUMP|JOF_DETECTING|JOF_LEFTASSOC)
-OPDEF(JSOP_AND,       69, "and",        NULL,         5,  1,  1, JOF_JUMP|JOF_DETECTING|JOF_LEFTASSOC)
-
-/* The switch bytecodes have variable length. */
-OPDEF(JSOP_TABLESWITCH, 70, "tableswitch", NULL,     -1,  1,  0,  JOF_TABLESWITCH|JOF_DETECTING)
-
-/*
- * Prologue emitted in scripts expected to run once, which deoptimizes code if
- * it executes multiple times.
- */
-OPDEF(JSOP_RUNONCE,   71, "runonce",    NULL,         1,  0,  0,  JOF_BYTE)
-
-/* New, infallible/transitive identity ops. */
-OPDEF(JSOP_STRICTEQ,  72, "stricteq",   "===",        1,  2,  1, JOF_BYTE|JOF_DETECTING|JOF_LEFTASSOC|JOF_ARITH)
-OPDEF(JSOP_STRICTNE,  73, "strictne",   "!==",        1,  2,  1, JOF_BYTE|JOF_DETECTING|JOF_LEFTASSOC|JOF_ARITH)
-
-/*
- * Sometimes web pages do 'o.Item(i) = j'. This is not an early SyntaxError,
- * for web compatibility. Instead we emit JSOP_SETCALL after the function call,
- * an opcode that always throws.
- */
-OPDEF(JSOP_SETCALL,   74, "setcall",    NULL,         1,  0,  0, JOF_BYTE)
-
-/*
- * JSOP_ITER sets up a for-in or for-each-in loop using the JSITER_* flag bits
- * in this op's uint8_t immediate operand. It replaces the top of stack value
- * with an iterator for that value.
- *
- * JSOP_MOREITER stores the next iterated value into cx->iterValue and pushes
- * true if another value is available, and false otherwise. It is followed
- * immediately by JSOP_IFNE.
- *
- * JSOP_ENDITER cleans up after the loop. It uses the slot above the iterator
- * for temporary GC rooting.
- */
-OPDEF(JSOP_ITER,      75, "iter",       NULL,         2,  1,  1,  JOF_UINT8)
-OPDEF(JSOP_MOREITER,  76, "moreiter",   NULL,         1,  1,  2,  JOF_BYTE)
-OPDEF(JSOP_ITERNEXT,  77, "iternext",   "<next>",     1,  0,  1,  JOF_BYTE)
-OPDEF(JSOP_ENDITER,   78, "enditer",    NULL,         1,  1,  0,  JOF_BYTE)
-
-OPDEF(JSOP_FUNAPPLY,  79, "funapply",   NULL,         3, -1,  1,  JOF_UINT16|JOF_INVOKE|JOF_TYPESET)
-
-/* Push object initializer literal. */
-OPDEF(JSOP_OBJECT,    80, "object",     NULL,         5,  0,  1,  JOF_OBJECT)
-
-/* Pop value and discard it. */
-OPDEF(JSOP_POP,       81, "pop",        NULL,         1,  1,  0,  JOF_BYTE)
-
-/* Call a function as a constructor; operand is argc. */
-OPDEF(JSOP_NEW,       82, js_new_str,   NULL,         3, -1,  1,  JOF_UINT16|JOF_INVOKE|JOF_TYPESET)
-
-OPDEF(JSOP_SPREAD,    83, "spread",     NULL,         1,  3,  2,  JOF_BYTE|JOF_ELEM|JOF_SET)
-
-/* Fast get/set ops for function arguments and local variables. */
-OPDEF(JSOP_GETARG,    84, "getarg",     NULL,         3,  0,  1,  JOF_QARG |JOF_NAME)
-OPDEF(JSOP_SETARG,    85, "setarg",     NULL,         3,  1,  1,  JOF_QARG |JOF_NAME|JOF_SET)
-OPDEF(JSOP_GETLOCAL,  86,"getlocal",    NULL,         4,  0,  1,  JOF_LOCAL|JOF_NAME)
-OPDEF(JSOP_SETLOCAL,  87,"setlocal",    NULL,         4,  1,  1,  JOF_LOCAL|JOF_NAME|JOF_SET|JOF_DETECTING)
-
-/* Push unsigned 16-bit int constant. */
-OPDEF(JSOP_UINT16,    88, "uint16",     NULL,         3,  0,  1,  JOF_UINT16)
-
-/*
- * Object and array literal support.  NEWINIT takes the kind of initializer
- * (JSProto_Array or JSProto_Object).  NEWARRAY is an array initializer
- * taking the final length, which can be filled in at the start and initialized
- * directly.  NEWOBJECT is an object initializer taking an object with the final
- * shape, which can be set at the start and slots then filled in directly.
- * NEWINIT has an extra byte so it can be exchanged with NEWOBJECT during emit.
- */
-OPDEF(JSOP_NEWINIT,   89, "newinit",    NULL,         5,  0,  1, JOF_UINT8)
-OPDEF(JSOP_NEWARRAY,  90, "newarray",   NULL,         4,  0,  1, JOF_UINT24)
-OPDEF(JSOP_NEWOBJECT, 91, "newobject",  NULL,         5,  0,  1, JOF_OBJECT)
-OPDEF(JSOP_ENDINIT,   92, "endinit",    NULL,         1,  0,  0, JOF_BYTE)
-OPDEF(JSOP_INITPROP,  93, "initprop",   NULL,         5,  2,  1, JOF_ATOM|JOF_PROP|JOF_SET|JOF_DETECTING)
-
-/* Initialize a numeric property in an object literal, like {1: x}. */
-OPDEF(JSOP_INITELEM,  94, "initelem",   NULL,         1,  3,  1, JOF_BYTE|JOF_ELEM|JOF_SET|JOF_DETECTING)
-
-/* Used in array literals with spread. */
-OPDEF(JSOP_INITELEM_INC,95, "initelem_inc", NULL,     1,  3,  2, JOF_BYTE|JOF_ELEM|JOF_SET)
-
-/* Initialize an array element. */
-OPDEF(JSOP_INITELEM_ARRAY,96, "initelem_array", NULL, 4,  2,  1,  JOF_UINT24|JOF_ELEM|JOF_SET|JOF_DETECTING)
-
-/*
- * Initialize a getter/setter in an object literal. The INITELEM* ops are used
- * for numeric properties like {get 2() {}}.
- */
-OPDEF(JSOP_INITPROP_GETTER,  97, "initprop_getter",   NULL, 5,  2,  1, JOF_ATOM|JOF_PROP|JOF_SET|JOF_DETECTING)
-OPDEF(JSOP_INITPROP_SETTER,  98, "initprop_setter",   NULL, 5,  2,  1, JOF_ATOM|JOF_PROP|JOF_SET|JOF_DETECTING)
-OPDEF(JSOP_INITELEM_GETTER,  99, "initelem_getter",   NULL, 1,  3,  1, JOF_BYTE|JOF_ELEM|JOF_SET|JOF_DETECTING)
-OPDEF(JSOP_INITELEM_SETTER, 100, "initelem_setter",   NULL, 1,  3,  1, JOF_BYTE|JOF_ELEM|JOF_SET|JOF_DETECTING)
-
-OPDEF(JSOP_UNUSED101,  101, "unused101",   NULL,         1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED102,  102, "unused102",   NULL,         1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED103,  103, "unused103",   NULL,         1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED104,  104, "unused104",   NULL,         1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED105,  105, "unused105",   NULL,         1,  0,  0,  JOF_BYTE)
-
-/* The argument is the offset to the next statement and is used by IonMonkey. */
-OPDEF(JSOP_LABEL,     106,"label",     NULL,          5,  0,  0,  JOF_JUMP)
-
-OPDEF(JSOP_UNUSED107, 107,"unused107",  NULL,         1,  0,  0,  JOF_BYTE)
-
-/* Like JSOP_FUNAPPLY but for f.call instead of f.apply. */
-OPDEF(JSOP_FUNCALL,   108,"funcall",    NULL,         3, -1,  1, JOF_UINT16|JOF_INVOKE|JOF_TYPESET)
-
-/* This opcode is the target of the backwards jump for some loop. */
-OPDEF(JSOP_LOOPHEAD,  109,"loophead",   NULL,         1,  0,  0,  JOF_BYTE)
-
-/* ECMA-compliant assignment ops. */
-OPDEF(JSOP_BINDNAME,  110,"bindname",   NULL,         5,  0,  1,  JOF_ATOM|JOF_NAME|JOF_SET)
-OPDEF(JSOP_SETNAME,   111,"setname",    NULL,         5,  2,  1,  JOF_ATOM|JOF_NAME|JOF_SET|JOF_DETECTING)
-
-/* Exception handling ops. */
-OPDEF(JSOP_THROW,     112,js_throw_str, NULL,         1,  1,  0,  JOF_BYTE)
-
-/* 'in' and 'instanceof' ops. */
-OPDEF(JSOP_IN,        113,js_in_str,    js_in_str,    1,  2,  1, JOF_BYTE|JOF_LEFTASSOC)
-OPDEF(JSOP_INSTANCEOF,114,js_instanceof_str,js_instanceof_str,1,2,1,JOF_BYTE|JOF_LEFTASSOC|JOF_TMPSLOT)
-
-/* debugger op */
-OPDEF(JSOP_DEBUGGER,  115,"debugger",   NULL,         1,  0,  0, JOF_BYTE)
-
-/* gosub/retsub for finally handling */
-OPDEF(JSOP_GOSUB,     116,"gosub",      NULL,         5,  0,  0,  JOF_JUMP)
-OPDEF(JSOP_RETSUB,    117,"retsub",     NULL,         1,  2,  0,  JOF_BYTE)
-
-/* More exception handling ops. */
-OPDEF(JSOP_EXCEPTION, 118,"exception",  NULL,         1,  0,  1,  JOF_BYTE)
-
-/* Embedded lineno to speedup pc->line mapping. */
-OPDEF(JSOP_LINENO,    119,"lineno",     NULL,         3,  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,120,"condswitch", NULL,         1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_CASE,      121,"case",       NULL,         5,  2,  1,  JOF_JUMP)
-OPDEF(JSOP_DEFAULT,   122,"default",    NULL,         5,  1,  0,  JOF_JUMP)
-
-/*
- * ECMA-compliant call to eval op
- */
-OPDEF(JSOP_EVAL,      123,"eval",       NULL,         3, -1,  1, JOF_UINT16|JOF_INVOKE|JOF_TYPESET)
-
-OPDEF(JSOP_UNUSED124,  124, "unused124", NULL,      1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED125,  125, "unused125", NULL,      1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED126,  126, "unused126", NULL,      1,  0,  0,  JOF_BYTE)
-
-/*
- * Prolog bytecodes for defining function, var, and const names.
- */
-OPDEF(JSOP_DEFFUN,    127,"deffun",     NULL,         5,  0,  0,  JOF_OBJECT)
-OPDEF(JSOP_DEFCONST,  128,"defconst",   NULL,         5,  0,  0,  JOF_ATOM)
-OPDEF(JSOP_DEFVAR,    129,"defvar",     NULL,         5,  0,  0,  JOF_ATOM)
-
-/* Push a closure for a named or anonymous function expression. */
-OPDEF(JSOP_LAMBDA,    130, "lambda",    NULL,         5,  0,  1, JOF_OBJECT)
-
-/* Used for named function expression self-naming, if lightweight. */
-OPDEF(JSOP_CALLEE,    131, "callee",    NULL,         1,  0,  1, JOF_BYTE)
-
-OPDEF(JSOP_UNUSED132, 132, "unused132", NULL,         1,  0,  0,  JOF_BYTE)
-
-/* Pick an element from the stack. */
-OPDEF(JSOP_PICK,        133, "pick",      NULL,       2,  0,  0,  JOF_UINT8|JOF_TMPSLOT2)
-
-/*
- * Exception handling no-op, for more economical byte-coding than SRC_TRYFIN
- * srcnote-annotated JSOP_NOPs and to simply stack balance handling.
- */
-OPDEF(JSOP_TRY,         134,"try",        NULL,       1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_FINALLY,     135,"finally",    NULL,       1,  0,  2,  JOF_BYTE)
-
-/*
- * An "aliased variable" is a var, let, or formal arg that is aliased. Sources
- * of aliasing include: nested functions accessing the vars of an enclosing
- * function, function statements that are conditionally executed, 'eval',
- * 'with', and 'arguments'. All of these cases require creating a CallObject to
- * own the aliased variable.
- *
- * An ALIASEDVAR opcode contains the following immediates:
- *  uint8 hops:  the number of scope objects to skip to find the ScopeObject
- *               containing the variable being accessed
- *  uint24 slot: the slot containing the variable in the ScopeObject (this
- *               'slot' does not include RESERVED_SLOTS).
- */
-OPDEF(JSOP_GETALIASEDVAR, 136,"getaliasedvar",NULL,   5,  0,  1, JOF_SCOPECOORD|JOF_NAME|JOF_TYPESET)
-OPDEF(JSOP_CALLALIASEDVAR,137,"callaliasedvar",NULL,  5,  0,  1, JOF_SCOPECOORD|JOF_NAME|JOF_TYPESET)
-OPDEF(JSOP_SETALIASEDVAR, 138,"setaliasedvar",NULL,   5,  1,  1, JOF_SCOPECOORD|JOF_NAME|JOF_SET|JOF_DETECTING)
-
-OPDEF(JSOP_UNUSED139,  139, "unused139",   NULL,         1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED140,  140, "unused140",   NULL,         1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED141,  141, "unused141",   NULL,         1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED142,  142, "unused142",   NULL,         1,  0,  0,  JOF_BYTE)
-
-/*
- * Intrinsic names are emitted instead of JSOP_*NAME ops when the
- * CompileOptions flag "selfHostingMode" is set.
- *
- * They are used in self-hosted code to access other self-hosted values and
- * intrinsic functions the runtime doesn't give client JS code access to.
- */
-OPDEF(JSOP_GETINTRINSIC,  143, "getintrinsic",  NULL, 5,  0,  1, JOF_ATOM|JOF_NAME|JOF_TYPESET)
-OPDEF(JSOP_CALLINTRINSIC, 144, "callintrinsic", NULL, 5,  0,  1, JOF_ATOM|JOF_NAME|JOF_TYPESET)
-OPDEF(JSOP_SETINTRINSIC,  145, "setintrinsic",  NULL, 5,  2,  1, JOF_ATOM|JOF_NAME|JOF_SET|JOF_DETECTING)
-OPDEF(JSOP_BINDINTRINSIC, 146, "bindintrinsic", NULL, 5,  0,  1, JOF_ATOM|JOF_NAME|JOF_SET)
-
-/* Unused. */
-OPDEF(JSOP_UNUSED147,     147,"unused147", NULL,      1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED148,     148,"unused148", NULL,      1,  0,  0,  JOF_BYTE)
-
-/* Placeholders for a real jump opcode set during backpatch chain fixup. */
-OPDEF(JSOP_BACKPATCH,     149,"backpatch", NULL,      5,  0,  0,  JOF_JUMP)
-OPDEF(JSOP_UNUSED150,     150,"unused150", NULL,      1,  0,  0,  JOF_BYTE)
-
-/* Set pending exception from the stack, to trigger rethrow. */
-OPDEF(JSOP_THROWING,      151,"throwing", NULL,       1,  1,  0,  JOF_BYTE)
-
-/* Set the return value pseudo-register in stack frame. */
-OPDEF(JSOP_SETRVAL,       152,"setrval",    NULL,       1,  1,  0,  JOF_BYTE)
-/*
- * Stop interpretation and return value set by JSOP_SETRVAL. When not set,
- * returns UndefinedValue. Also emitted at end of script so interpreter
- * don't need to check if opcode is still in script range.
- */
-OPDEF(JSOP_RETRVAL,       153,"retrval",    NULL,       1,  0,  0,  JOF_BYTE)
-
-/* Free variable references that must either be found on the global or a ReferenceError */
-OPDEF(JSOP_GETGNAME,      154,"getgname",  NULL,       5,  0,  1, JOF_ATOM|JOF_NAME|JOF_TYPESET|JOF_GNAME)
-OPDEF(JSOP_SETGNAME,      155,"setgname",  NULL,       5,  2,  1, JOF_ATOM|JOF_NAME|JOF_SET|JOF_DETECTING|JOF_GNAME)
-
-OPDEF(JSOP_UNUSED156,  156, "unused156",   NULL,         1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED157,  157, "unused157",   NULL,         1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED158,  158, "unused158",   NULL,         1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED159,  159, "unused159",   NULL,         1,  0,  0,  JOF_BYTE)
-
-/* Regular expression literal requiring special "fork on exec" handling. */
-OPDEF(JSOP_REGEXP,        160,"regexp",   NULL,       5,  0,  1, JOF_REGEXP)
-
-OPDEF(JSOP_UNUSED161,     161,"unused161",  NULL,     1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED162,     162,"unused162",  NULL,     1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED163,     163,"unused163",  NULL,     1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED164,     164,"unused164",  NULL,     1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED165,     165,"unused165",  NULL,     1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED166,     166,"unused166",  NULL,     1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED167,     167,"unused167",  NULL,     1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED168,     168,"unused168",  NULL,     1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED169,     169,"unused169",  NULL,     1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED170,     170,"unused170",  NULL,     1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED171,     171,"unused171",  NULL,     1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED172,     172,"unused172",  NULL,     1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED173,     173,"unused173",  NULL,     1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED174,     174,"unused174",  NULL,     1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED175,     175,"unused175",  NULL,     1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED176,     176,"unused176",  NULL,     1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED177,     177,"unused177",  NULL,     1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED178,     178,"unused178",  NULL,     1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED179,     179,"unused179",  NULL,     1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED180,     180,"unused180",  NULL,     1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED181,     181,"unused181",  NULL,     1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED182,     182,"unused182",  NULL,     1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED183,     183,"unused183",  NULL,     1,  0,  0,  JOF_BYTE)
-
-OPDEF(JSOP_CALLPROP,      184,"callprop",   NULL,     5,  1,  1, JOF_ATOM|JOF_PROP|JOF_TYPESET|JOF_TMPSLOT3)
-
-OPDEF(JSOP_UNUSED185,     185,"unused185",  NULL,     1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED186,     186,"unused186",  NULL,     1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED187,     187,"unused187",  NULL,     1,  0,  0,  JOF_BYTE)
-
-/*
- * Opcode to hold 24-bit immediate integer operands.
- */
-OPDEF(JSOP_UINT24,        188,"uint24",     NULL,     4,  0,  1, JOF_UINT24)
-
-OPDEF(JSOP_UNUSED189,     189,"unused189",   NULL,    1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED190,     190,"unused190",   NULL,    1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED191,     191,"unused191",   NULL,    1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED192,     192,"unused192",   NULL,    1,  0,  0,  JOF_BYTE)
-
-OPDEF(JSOP_CALLELEM,      193, "callelem",   NULL,    1,  2,  1, JOF_BYTE |JOF_ELEM|JOF_TYPESET|JOF_LEFTASSOC)
-
-/* __proto__: v inside an object initializer. */
-OPDEF(JSOP_MUTATEPROTO,   194, "mutateproto",NULL,    1,  2,  1, JOF_BYTE)
-
-/*
- * Get an extant property value, throwing ReferenceError if the identified
- * property does not exist.
- */
-OPDEF(JSOP_GETXPROP,      195,"getxprop",    NULL,    5,  1,  1, JOF_ATOM|JOF_PROP|JOF_TYPESET)
-
-OPDEF(JSOP_UNUSED196,     196,"unused196",   NULL,    1,  0,  0, JOF_BYTE)
-
-/*
- * Specialized JSOP_TYPEOF to avoid reporting undefined for typeof(0, undef).
- */
-OPDEF(JSOP_TYPEOFEXPR,    197,"typeofexpr",  NULL,    1,  1,  1, JOF_BYTE|JOF_DETECTING)
-
-/*
- * Block-local scope support.
- */
-OPDEF(JSOP_PUSHBLOCKSCOPE,198,"pushblockscope", NULL, 5,  0,  0,  JOF_OBJECT)
-OPDEF(JSOP_POPBLOCKSCOPE, 199,"popblockscope", NULL,  1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_DEBUGLEAVEBLOCK, 200,"debugleaveblock", NULL, 1,  0,  0,  JOF_BYTE)
-
-OPDEF(JSOP_UNUSED201,     201,"unused201",  NULL,     1,  0,  0,  JOF_BYTE)
-
-/*
- * Generator and array comprehension support.
- */
-OPDEF(JSOP_GENERATOR,     202,"generator",   NULL,    1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_YIELD,         203,"yield",       NULL,    1,  1,  1,  JOF_BYTE)
-OPDEF(JSOP_ARRAYPUSH,     204,"arraypush",   NULL,    1,  2,  0,  JOF_BYTE)
-
-OPDEF(JSOP_UNUSED205,     205, "unused205",    NULL,  1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED206,     206, "unused206",    NULL,  1,  0,  0,  JOF_BYTE)
-
-OPDEF(JSOP_UNUSED207,     207, "unused207",    NULL,  1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED208,     208, "unused208",    NULL,  1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED209,     209, "unused209",    NULL,  1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED210,     210, "unused210",    NULL,  1,  0,  0,  JOF_BYTE)
-
-OPDEF(JSOP_CALLGNAME,     211, "callgname",    NULL,  5,  0,  1,  JOF_ATOM|JOF_NAME|JOF_TYPESET|JOF_GNAME)
-OPDEF(JSOP_CALLLOCAL,     212, "calllocal",    NULL,  4,  0,  1,  JOF_LOCAL|JOF_NAME)
-OPDEF(JSOP_CALLARG,       213, "callarg",      NULL,  3,  0,  1,  JOF_QARG |JOF_NAME)
-OPDEF(JSOP_BINDGNAME,     214, "bindgname",    NULL,  5,  0,  1,  JOF_ATOM|JOF_NAME|JOF_SET|JOF_GNAME)
-
-/*
- * Opcodes to hold 8-bit and 32-bit immediate integer operands.
- */
-OPDEF(JSOP_INT8,          215, "int8",         NULL,  2,  0,  1, JOF_INT8)
-OPDEF(JSOP_INT32,         216, "int32",        NULL,  5,  0,  1, JOF_INT32)
-
-/*
- * Get the value of the 'length' property from a stacked object.
- */
-OPDEF(JSOP_LENGTH,        217, "length",       NULL,  5,  1,  1, JOF_ATOM|JOF_PROP|JOF_TYPESET|JOF_TMPSLOT3)
-
-/*
- * Push a JSVAL_HOLE value onto the stack, representing an omitted property in
- * an array literal (e.g. property 0 in the array [, 1]).  This opcode is used
- * with the JSOP_NEWARRAY opcode.
- */
-OPDEF(JSOP_HOLE,          218, "hole",         NULL,  1,  0,  1,  JOF_BYTE)
-
-OPDEF(JSOP_UNUSED219,     219,"unused219",     NULL,  1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED220,     220,"unused220",     NULL,  1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED221,     221,"unused221",     NULL,  1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED222,     222,"unused222",     NULL,  1,  0,  0,  JOF_BYTE)
-OPDEF(JSOP_UNUSED223,     223,"unused223",     NULL,  1,  0,  0,  JOF_BYTE)
-
-OPDEF(JSOP_REST,          224, "rest",         NULL,  1,  0,  1,  JOF_BYTE|JOF_TYPESET)
-
-/* Pop the stack, convert to a jsid (int or string), and push back. */
-OPDEF(JSOP_TOID,          225, "toid",         NULL,  1,  1,  1,  JOF_BYTE)
-
-/* Push the implicit 'this' value for calls to the associated name. */
-OPDEF(JSOP_IMPLICITTHIS,  226, "implicitthis", "",    5,  0,  1,  JOF_ATOM)
-
-/*
- * This opcode is the target of the entry jump for some loop. The uint8 argument
- * is the loop depth. This value starts at 1 and is just a hint: deeply
- * nested loops all have the same value.
- */
-OPDEF(JSOP_LOOPENTRY,     227, "loopentry",    NULL,  2,  0,  0,  JOF_UINT8)
-
-/*
- * Pad out the unused opcode space to the nearest power-of-two boundary. The
- * interpreter uses this to construct a table which is a power-of-two size.
- */
-#ifdef OPPAD
-OPPAD(228)
-OPPAD(229)
-OPPAD(230)
-OPPAD(231)
-OPPAD(232)
-OPPAD(233)
-OPPAD(234)
-OPPAD(235)
-OPPAD(236)
-OPPAD(237)
-OPPAD(238)
-OPPAD(239)
-OPPAD(240)
-OPPAD(241)
-OPPAD(242)
-OPPAD(243)
-OPPAD(244)
-OPPAD(245)
-OPPAD(246)
-OPPAD(247)
-OPPAD(248)
-OPPAD(249)
-OPPAD(250)
-OPPAD(251)
-OPPAD(252)
-OPPAD(253)
-OPPAD(254)
-OPPAD(255)
-#endif
diff --git a/js/src/jsoplengen.cpp b/js/src/jsoplengen.cpp
deleted file mode 100644
index db5249a4eb27..000000000000
--- a/js/src/jsoplengen.cpp
+++ /dev/null
@@ -1,91 +0,0 @@
-/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
- * vim: set ts=8 sts=4 et sw=4 tw=99:
- * This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-static const struct {
-    const char  *name;
-    int         length;
-} pairs[] = {
-#define OPDEF(op,val,name,token,length,nuses,ndefs,format)               \
-    { #op, length } ,
-#include "jsopcode.tbl"
-#undef OPDEF
-};
-
-int
-main(int argc, char **argv)
-{
-    FILE *fp;
-    size_t maxNameWidth, i, nameWidth, tabStop;
-    int lengthGap;
-
-    static const char prefix[] = "#define ";
-    static const char suffix[] = "_LENGTH";
-    static const size_t tabWidth = 8;
-    static const size_t prefixWidth = sizeof(prefix) - 1;
-    static const size_t suffixWidth = sizeof(suffix) - 1;
-
-    if (argc != 2) {
-        fputs("Bad usage\n", stderr);
-        return EXIT_FAILURE;
-    }
-
-    fp = fopen(argv[1], "w");
-    if (!fp) {
-        perror("fopen");
-        return EXIT_FAILURE;
-    }
-    fputs("#ifndef JSAUTOOPLEN_H___\n", fp);
-    fputs("#define JSAUTOOPLEN_H___\n", fp);
-    fputs("/*\n"
-          " * Automatically generated header with JS opcode length constants.\n"
-          " *\n"
-          " * Do not edit it, alter jsopcode.tbl instead.\n"
-          " */\n",
-          fp);
-
-    /*
-     * Print
-     *
-     * #define name_LENGTH length
-     *
-     * with all length values aligned on the same column. The column is at the
-     * second character position after a tab-stop with the first position
-     * reserved for the minus sign of variable-length opcodes.
-     */
-    maxNameWidth = 0;
-    for (i = 0; i != sizeof pairs / sizeof pairs[0]; ++i) {
-        nameWidth = strlen(pairs[i].name);
-        if (maxNameWidth < nameWidth)
-            maxNameWidth = nameWidth;
-    }
-
-    tabStop = prefixWidth + maxNameWidth + suffixWidth + 1;
-    tabStop = (tabStop + tabWidth - 1) / tabWidth * tabWidth;
-    for (i = 0; i != sizeof pairs / sizeof pairs[0]; ++i) {
-        lengthGap = (int) (tabStop - prefixWidth - strlen(pairs[i].name) -
-                           suffixWidth);
-        fprintf(fp, "%s%s%s%*c%2d\n",
-                prefix, pairs[i].name, suffix, lengthGap, ' ',
-                pairs[i].length);
-        if (ferror(fp)) {
-            perror("fclose");
-            exit(EXIT_FAILURE);
-        }
-    }
-
-    fputs("#endif  // JSAUTOOPLEN_H___\n", fp);
-
-    if (fclose(fp)) {
-        perror("fclose");
-        return EXIT_FAILURE;
-    }
-
-    return EXIT_SUCCESS;
-}
diff --git a/js/src/jsscript.cpp b/js/src/jsscript.cpp
index 75f08a49ac85..e8810a520e6c 100644
--- a/js/src/jsscript.cpp
+++ b/js/src/jsscript.cpp
@@ -18,7 +18,6 @@
 
 #include "jsapi.h"
 #include "jsatom.h"
-#include "jsautooplen.h"
 #include "jscntxt.h"
 #include "jsfun.h"
 #include "jsgc.h"
@@ -37,6 +36,7 @@
 #include "vm/ArgumentsObject.h"
 #include "vm/Compression.h"
 #include "vm/Debugger.h"
+#include "vm/Opcodes.h"
 #include "vm/Shape.h"
 #include "vm/Xdr.h"
 
diff --git a/js/src/jsstr.cpp b/js/src/jsstr.cpp
index 896ac1c98939..22c3335d742b 100644
--- a/js/src/jsstr.cpp
+++ b/js/src/jsstr.cpp
@@ -28,7 +28,6 @@
 #include "jsapi.h"
 #include "jsarray.h"
 #include "jsatom.h"
-#include "jsautooplen.h"
 #include "jsbool.h"
 #include "jscntxt.h"
 #include "jsgc.h"
@@ -42,6 +41,7 @@
 #include "vm/GlobalObject.h"
 #include "vm/Interpreter.h"
 #include "vm/NumericConversions.h"
+#include "vm/Opcodes.h"
 #include "vm/RegExpObject.h"
 #include "vm/RegExpStatics.h"
 #include "vm/ScopeObject.h"
diff --git a/js/src/moz.build b/js/src/moz.build
index 1c975ed6ab98..1265db456b8c 100644
--- a/js/src/moz.build
+++ b/js/src/moz.build
@@ -382,7 +382,6 @@ MSVC_ENABLE_PGO = True
 
 HOST_SOURCES += [
     'jskwgen.cpp',
-    'jsoplengen.cpp',
 ]
 
 HOST_SIMPLE_PROGRAMS += [
diff --git a/js/src/vm/Interpreter.cpp b/js/src/vm/Interpreter.cpp
index c15208f1a28e..d0142aac8945 100644
--- a/js/src/vm/Interpreter.cpp
+++ b/js/src/vm/Interpreter.cpp
@@ -18,7 +18,6 @@
 
 #include "jsarray.h"
 #include "jsatom.h"
-#include "jsautooplen.h"
 #include "jscntxt.h"
 #include "jsfun.h"
 #include "jsgc.h"
@@ -39,6 +38,7 @@
 #include "jit/Ion.h"
 #include "js/OldDebugAPI.h"
 #include "vm/Debugger.h"
+#include "vm/Opcodes.h"
 #include "vm/Shape.h"
 
 #include "jsatominlines.h"
@@ -1341,14 +1341,15 @@ Interpret(JSContext *cx, RunState &state)
     // Use addresses instead of offsets to optimize for runtime speed over
     // load-time relocation overhead.
     static const void *const addresses[EnableInterruptsPseudoOpcode + 1] = {
-# define OPDEF(op,v,n,t,l,u,d,f)  LABEL(op),
-# define OPPAD(v)                                                             \
+# define OPCODE_LABEL(op, ...)  LABEL(op),
+        FOR_EACH_OPCODE(OPCODE_LABEL)
+# undef OPCODE_LABEL
+# define TRAILING_LABEL(v)                                                    \
     ((v) == EnableInterruptsPseudoOpcode                                      \
      ? LABEL(EnableInterruptsPseudoOpcode)                                    \
      : LABEL(default)),
-# include "jsopcode.tbl"
-# undef OPDEF
-# undef OPPAD
+        FOR_EACH_TRAILING_UNUSED_OPCODE(TRAILING_LABEL)
+# undef TRAILING_LABEL
     };
 #else
 // Portable switch-based dispatch.
diff --git a/js/src/vm/Opcodes.h b/js/src/vm/Opcodes.h
new file mode 100644
index 000000000000..180f6e5a33ed
--- /dev/null
+++ b/js/src/vm/Opcodes.h
@@ -0,0 +1,547 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sw=4 et tw=0 ft=c:
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef vm_Opcodes_h
+#define vm_Opcodes_h
+
+#include "mozilla/Attributes.h"
+
+#include <stddef.h>
+
+/*
+ * JavaScript operation bytecodes.  Add a new bytecode by claiming one of the
+ * JSOP_UNUSED* here or by extracting the first unused opcode from
+ * FOR_EACH_TRAILING_UNUSED_OPCODE and updating js::detail::LastDefinedOpcode
+ * below.
+ *
+ * When changing the bytecode, don't forget to update XDR_BYTECODE_VERSION in
+ * vm/Xdr.h!
+ *
+ * Includers must define a macro with the following form:
+ *
+ * #define MACRO(op,val,name,image,length,nuses,ndefs,format) ...
+ *
+ * Then simply use FOR_EACH_OPCODE(MACRO) to invoke MACRO for every opcode.
+ * Selected arguments can be expanded in initializers.
+ *
+ * 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, -1 if variadic
+ * format       Bytecode plus immediate operand encoding format
+ *
+ * This file is best viewed with 128 columns:
+12345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678
+ */
+
+#define FOR_EACH_OPCODE(macro) \
+    /* legend:  op      val   name          image       len use def  format */ \
+    macro(JSOP_NOP,       0,  "nop",        NULL,         1,  0,  0, JOF_BYTE) \
+    \
+    /* Long-standing JavaScript bytecodes. */ \
+    macro(JSOP_UNDEFINED, 1,  js_undefined_str, "",       1,  0,  1, JOF_BYTE) \
+    macro(JSOP_UNUSED2,   2,  "unused2",    NULL,         1,  1,  0, JOF_BYTE) \
+    macro(JSOP_ENTERWITH, 3,  "enterwith",  NULL,         1,  1,  1, JOF_BYTE) \
+    macro(JSOP_LEAVEWITH, 4,  "leavewith",  NULL,         1,  1,  0, JOF_BYTE) \
+    macro(JSOP_RETURN,    5,  "return",     NULL,         1,  1,  0, JOF_BYTE) \
+    macro(JSOP_GOTO,      6,  "goto",       NULL,         5,  0,  0, JOF_JUMP) \
+    macro(JSOP_IFEQ,      7,  "ifeq",       NULL,         5,  1,  0, JOF_JUMP|JOF_DETECTING) \
+    macro(JSOP_IFNE,      8,  "ifne",       NULL,         5,  1,  0, JOF_JUMP) \
+    \
+    /* Get the arguments object for the current, lightweight function activation. */ \
+    macro(JSOP_ARGUMENTS, 9,  "arguments",  NULL,         1,  0,  1, JOF_BYTE) \
+    \
+    macro(JSOP_SWAP,      10, "swap",       NULL,         1,  2,  2, JOF_BYTE) \
+    macro(JSOP_POPN,      11, "popn",       NULL,         3, -1,  0, JOF_UINT16) \
+    \
+    /* More long-standing bytecodes. */ \
+    macro(JSOP_DUP,       12, "dup",        NULL,         1,  1,  2, JOF_BYTE) \
+    macro(JSOP_DUP2,      13, "dup2",       NULL,         1,  2,  4, JOF_BYTE) \
+    macro(JSOP_SETCONST,  14, "setconst",   NULL,         5,  1,  1, JOF_ATOM|JOF_NAME|JOF_SET) \
+    macro(JSOP_BITOR,     15, "bitor",      "|",          1,  2,  1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH) \
+    macro(JSOP_BITXOR,    16, "bitxor",     "^",          1,  2,  1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH) \
+    macro(JSOP_BITAND,    17, "bitand",     "&",          1,  2,  1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH) \
+    macro(JSOP_EQ,        18, "eq",         "==",         1,  2,  1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH|JOF_DETECTING) \
+    macro(JSOP_NE,        19, "ne",         "!=",         1,  2,  1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH|JOF_DETECTING) \
+    macro(JSOP_LT,        20, "lt",         "<",          1,  2,  1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH) \
+    macro(JSOP_LE,        21, "le",         "<=",         1,  2,  1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH) \
+    macro(JSOP_GT,        22, "gt",         ">",          1,  2,  1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH) \
+    macro(JSOP_GE,        23, "ge",         ">=",         1,  2,  1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH) \
+    macro(JSOP_LSH,       24, "lsh",        "<<",         1,  2,  1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH) \
+    macro(JSOP_RSH,       25, "rsh",        ">>",         1,  2,  1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH) \
+    macro(JSOP_URSH,      26, "ursh",       ">>>",        1,  2,  1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH) \
+    macro(JSOP_ADD,       27, "add",        "+",          1,  2,  1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH) \
+    macro(JSOP_SUB,       28, "sub",        "-",          1,  2,  1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH) \
+    macro(JSOP_MUL,       29, "mul",        "*",          1,  2,  1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH) \
+    macro(JSOP_DIV,       30, "div",        "/",          1,  2,  1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH) \
+    macro(JSOP_MOD,       31, "mod",        "%",          1,  2,  1, JOF_BYTE|JOF_LEFTASSOC|JOF_ARITH) \
+    macro(JSOP_NOT,       32, "not",        "!",          1,  1,  1, JOF_BYTE|JOF_ARITH|JOF_DETECTING) \
+    macro(JSOP_BITNOT,    33, "bitnot",     "~",          1,  1,  1, JOF_BYTE|JOF_ARITH) \
+    macro(JSOP_NEG,       34, "neg",        "- ",         1,  1,  1, JOF_BYTE|JOF_ARITH) \
+    macro(JSOP_POS,       35, "pos",        "+ ",         1,  1,  1, JOF_BYTE|JOF_ARITH) \
+    macro(JSOP_DELNAME,   36, "delname",    NULL,         5,  0,  1, JOF_ATOM|JOF_NAME) \
+    macro(JSOP_DELPROP,   37, "delprop",    NULL,         5,  1,  1, JOF_ATOM|JOF_PROP) \
+    macro(JSOP_DELELEM,   38, "delelem",    NULL,         1,  2,  1, JOF_BYTE |JOF_ELEM) \
+    macro(JSOP_TYPEOF,    39, js_typeof_str,NULL,         1,  1,  1, JOF_BYTE|JOF_DETECTING) \
+    macro(JSOP_VOID,      40, js_void_str,  NULL,         1,  1,  1, JOF_BYTE) \
+    \
+    /* spreadcall variant of JSOP_CALL */ \
+    macro(JSOP_SPREADCALL,41, "spreadcall", NULL,         1,  3,  1, JOF_BYTE|JOF_INVOKE|JOF_TYPESET) \
+    /* spreadcall variant of JSOP_NEW */ \
+    macro(JSOP_SPREADNEW, 42, "spreadnew",  NULL,         1,  3,  1, JOF_BYTE|JOF_INVOKE|JOF_TYPESET) \
+    /* spreadcall variant of JSOP_EVAL */ \
+    macro(JSOP_SPREADEVAL,43, "spreadeval", NULL,         1,  3,  1, JOF_BYTE|JOF_INVOKE|JOF_TYPESET) \
+    \
+    /* Pop N values, preserving top value. */ \
+    macro(JSOP_POPNV,     44, "popnv",      NULL,         3, -1,  1,  JOF_UINT16) \
+    \
+    macro(JSOP_UNUSED45,  45, "unused45",   NULL,         1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED46,  46, "unused46",   NULL,         1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED47,  47, "unused47",   NULL,         1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED48,  48, "unused48",   NULL,         1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED49,  49, "unused49",   NULL,         1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED50,  50, "unused50",   NULL,         1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED51,  51, "unused51",   NULL,         1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED52,  52, "unused52",   NULL,         1,  0,  0,  JOF_BYTE) \
+    \
+    macro(JSOP_GETPROP,   53, "getprop",    NULL,         5,  1,  1, JOF_ATOM|JOF_PROP|JOF_TYPESET|JOF_TMPSLOT3) \
+    macro(JSOP_SETPROP,   54, "setprop",    NULL,         5,  2,  1, JOF_ATOM|JOF_PROP|JOF_SET|JOF_DETECTING|JOF_TMPSLOT) \
+    macro(JSOP_GETELEM,   55, "getelem",    NULL,         1,  2,  1, JOF_BYTE |JOF_ELEM|JOF_TYPESET|JOF_LEFTASSOC) \
+    macro(JSOP_SETELEM,   56, "setelem",    NULL,         1,  3,  1, JOF_BYTE |JOF_ELEM|JOF_SET|JOF_DETECTING) \
+    macro(JSOP_CALLNAME,  57, "callname",   NULL,         5,  0,  1, JOF_ATOM|JOF_NAME|JOF_TYPESET) \
+    macro(JSOP_CALL,      58, "call",       NULL,         3, -1,  1, JOF_UINT16|JOF_INVOKE|JOF_TYPESET) \
+    macro(JSOP_NAME,      59, "name",       NULL,         5,  0,  1, JOF_ATOM|JOF_NAME|JOF_TYPESET) \
+    macro(JSOP_DOUBLE,    60, "double",     NULL,         5,  0,  1, JOF_DOUBLE) \
+    macro(JSOP_STRING,    61, "string",     NULL,         5,  0,  1, JOF_ATOM) \
+    macro(JSOP_ZERO,      62, "zero",       "0",          1,  0,  1, JOF_BYTE) \
+    macro(JSOP_ONE,       63, "one",        "1",          1,  0,  1, JOF_BYTE) \
+    macro(JSOP_NULL,      64, js_null_str,  js_null_str,  1,  0,  1, JOF_BYTE) \
+    macro(JSOP_THIS,      65, js_this_str,  js_this_str,  1,  0,  1, JOF_BYTE) \
+    macro(JSOP_FALSE,     66, js_false_str, js_false_str, 1,  0,  1, JOF_BYTE) \
+    macro(JSOP_TRUE,      67, js_true_str,  js_true_str,  1,  0,  1, JOF_BYTE) \
+    macro(JSOP_OR,        68, "or",         NULL,         5,  1,  1, JOF_JUMP|JOF_DETECTING|JOF_LEFTASSOC) \
+    macro(JSOP_AND,       69, "and",        NULL,         5,  1,  1, JOF_JUMP|JOF_DETECTING|JOF_LEFTASSOC) \
+    \
+    /* The switch bytecodes have variable length. */ \
+    macro(JSOP_TABLESWITCH, 70, "tableswitch", NULL,     -1,  1,  0,  JOF_TABLESWITCH|JOF_DETECTING) \
+    \
+    /*
+     * Prologue emitted in scripts expected to run once, which deoptimizes code if
+     * it executes multiple times.
+     */ \
+    macro(JSOP_RUNONCE,   71, "runonce",    NULL,         1,  0,  0,  JOF_BYTE) \
+    \
+    /* New, infallible/transitive identity ops. */ \
+    macro(JSOP_STRICTEQ,  72, "stricteq",   "===",        1,  2,  1, JOF_BYTE|JOF_DETECTING|JOF_LEFTASSOC|JOF_ARITH) \
+    macro(JSOP_STRICTNE,  73, "strictne",   "!==",        1,  2,  1, JOF_BYTE|JOF_DETECTING|JOF_LEFTASSOC|JOF_ARITH) \
+    \
+    /*
+     * Sometimes web pages do 'o.Item(i) = j'. This is not an early SyntaxError,
+     * for web compatibility. Instead we emit JSOP_SETCALL after the function call,
+     * an opcode that always throws.
+     */ \
+    macro(JSOP_SETCALL,   74, "setcall",    NULL,         1,  0,  0, JOF_BYTE) \
+    \
+    /*
+     * JSOP_ITER sets up a for-in or for-each-in loop using the JSITER_* flag bits
+     * in this op's uint8_t immediate operand. It replaces the top of stack value
+     * with an iterator for that value.
+     *
+     * JSOP_MOREITER stores the next iterated value into cx->iterValue and pushes
+     * true if another value is available, and false otherwise. It is followed
+     * immediately by JSOP_IFNE.
+     *
+     * JSOP_ENDITER cleans up after the loop. It uses the slot above the iterator
+     * for temporary GC rooting.
+     */ \
+    macro(JSOP_ITER,      75, "iter",       NULL,         2,  1,  1,  JOF_UINT8) \
+    macro(JSOP_MOREITER,  76, "moreiter",   NULL,         1,  1,  2,  JOF_BYTE) \
+    macro(JSOP_ITERNEXT,  77, "iternext",   "<next>",     1,  0,  1,  JOF_BYTE) \
+    macro(JSOP_ENDITER,   78, "enditer",    NULL,         1,  1,  0,  JOF_BYTE) \
+    \
+    macro(JSOP_FUNAPPLY,  79, "funapply",   NULL,         3, -1,  1,  JOF_UINT16|JOF_INVOKE|JOF_TYPESET) \
+    \
+    /* Push object initializer literal. */ \
+    macro(JSOP_OBJECT,    80, "object",     NULL,         5,  0,  1,  JOF_OBJECT) \
+    \
+    /* Pop value and discard it. */ \
+    macro(JSOP_POP,       81, "pop",        NULL,         1,  1,  0,  JOF_BYTE) \
+    \
+    /* Call a function as a constructor; operand is argc. */ \
+    macro(JSOP_NEW,       82, js_new_str,   NULL,         3, -1,  1,  JOF_UINT16|JOF_INVOKE|JOF_TYPESET) \
+    \
+    macro(JSOP_SPREAD,    83, "spread",     NULL,         1,  3,  2,  JOF_BYTE|JOF_ELEM|JOF_SET) \
+    \
+    /* Fast get/set ops for function arguments and local variables. */ \
+    macro(JSOP_GETARG,    84, "getarg",     NULL,         3,  0,  1,  JOF_QARG |JOF_NAME) \
+    macro(JSOP_SETARG,    85, "setarg",     NULL,         3,  1,  1,  JOF_QARG |JOF_NAME|JOF_SET) \
+    macro(JSOP_GETLOCAL,  86,"getlocal",    NULL,         4,  0,  1,  JOF_LOCAL|JOF_NAME) \
+    macro(JSOP_SETLOCAL,  87,"setlocal",    NULL,         4,  1,  1,  JOF_LOCAL|JOF_NAME|JOF_SET|JOF_DETECTING) \
+    \
+    /* Push unsigned 16-bit int constant. */ \
+    macro(JSOP_UINT16,    88, "uint16",     NULL,         3,  0,  1,  JOF_UINT16) \
+    \
+    /*
+     * Object and array literal support.  NEWINIT takes the kind of initializer
+     * (JSProto_Array or JSProto_Object).  NEWARRAY is an array initializer
+     * taking the final length, which can be filled in at the start and initialized
+     * directly.  NEWOBJECT is an object initializer taking an object with the final
+     * shape, which can be set at the start and slots then filled in directly.
+     * NEWINIT has an extra byte so it can be exchanged with NEWOBJECT during emit.
+     */ \
+    macro(JSOP_NEWINIT,   89, "newinit",    NULL,         5,  0,  1, JOF_UINT8) \
+    macro(JSOP_NEWARRAY,  90, "newarray",   NULL,         4,  0,  1, JOF_UINT24) \
+    macro(JSOP_NEWOBJECT, 91, "newobject",  NULL,         5,  0,  1, JOF_OBJECT) \
+    macro(JSOP_ENDINIT,   92, "endinit",    NULL,         1,  0,  0, JOF_BYTE) \
+    macro(JSOP_INITPROP,  93, "initprop",   NULL,         5,  2,  1, JOF_ATOM|JOF_PROP|JOF_SET|JOF_DETECTING) \
+    \
+    /* Initialize a numeric property in an object literal, like {1: x}. */ \
+    macro(JSOP_INITELEM,  94, "initelem",   NULL,         1,  3,  1, JOF_BYTE|JOF_ELEM|JOF_SET|JOF_DETECTING) \
+    \
+    /* Used in array literals with spread. */ \
+    macro(JSOP_INITELEM_INC,95, "initelem_inc", NULL,     1,  3,  2, JOF_BYTE|JOF_ELEM|JOF_SET) \
+    \
+    /* Initialize an array element. */ \
+    macro(JSOP_INITELEM_ARRAY,96, "initelem_array", NULL, 4,  2,  1,  JOF_UINT24|JOF_ELEM|JOF_SET|JOF_DETECTING) \
+    \
+    /*
+     * Initialize a getter/setter in an object literal. The INITELEM* ops are used
+     * for numeric properties like {get 2() {}}.
+     */ \
+    macro(JSOP_INITPROP_GETTER,  97, "initprop_getter",   NULL, 5,  2,  1, JOF_ATOM|JOF_PROP|JOF_SET|JOF_DETECTING) \
+    macro(JSOP_INITPROP_SETTER,  98, "initprop_setter",   NULL, 5,  2,  1, JOF_ATOM|JOF_PROP|JOF_SET|JOF_DETECTING) \
+    macro(JSOP_INITELEM_GETTER,  99, "initelem_getter",   NULL, 1,  3,  1, JOF_BYTE|JOF_ELEM|JOF_SET|JOF_DETECTING) \
+    macro(JSOP_INITELEM_SETTER, 100, "initelem_setter",   NULL, 1,  3,  1, JOF_BYTE|JOF_ELEM|JOF_SET|JOF_DETECTING) \
+    \
+    macro(JSOP_UNUSED101,  101, "unused101",   NULL,         1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED102,  102, "unused102",   NULL,         1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED103,  103, "unused103",   NULL,         1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED104,  104, "unused104",   NULL,         1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED105,  105, "unused105",   NULL,         1,  0,  0,  JOF_BYTE) \
+    \
+    /* The argument is the offset to the next statement and is used by IonMonkey. */ \
+    macro(JSOP_LABEL,     106,"label",     NULL,          5,  0,  0,  JOF_JUMP) \
+    \
+    macro(JSOP_UNUSED107, 107,"unused107",  NULL,         1,  0,  0,  JOF_BYTE) \
+    \
+    /* Like JSOP_FUNAPPLY but for f.call instead of f.apply. */ \
+    macro(JSOP_FUNCALL,   108,"funcall",    NULL,         3, -1,  1, JOF_UINT16|JOF_INVOKE|JOF_TYPESET) \
+    \
+    /* This opcode is the target of the backwards jump for some loop. */ \
+    macro(JSOP_LOOPHEAD,  109,"loophead",   NULL,         1,  0,  0,  JOF_BYTE) \
+    \
+    /* ECMA-compliant assignment ops. */ \
+    macro(JSOP_BINDNAME,  110,"bindname",   NULL,         5,  0,  1,  JOF_ATOM|JOF_NAME|JOF_SET) \
+    macro(JSOP_SETNAME,   111,"setname",    NULL,         5,  2,  1,  JOF_ATOM|JOF_NAME|JOF_SET|JOF_DETECTING) \
+    \
+    /* Exception handling ops. */ \
+    macro(JSOP_THROW,     112,js_throw_str, NULL,         1,  1,  0,  JOF_BYTE) \
+    \
+    /* 'in' and 'instanceof' ops. */ \
+    macro(JSOP_IN,        113,js_in_str,    js_in_str,    1,  2,  1, JOF_BYTE|JOF_LEFTASSOC) \
+    macro(JSOP_INSTANCEOF,114,js_instanceof_str,js_instanceof_str,1,2,1,JOF_BYTE|JOF_LEFTASSOC|JOF_TMPSLOT) \
+    \
+    /* debugger op */ \
+    macro(JSOP_DEBUGGER,  115,"debugger",   NULL,         1,  0,  0, JOF_BYTE) \
+    \
+    /* gosub/retsub for finally handling */ \
+    macro(JSOP_GOSUB,     116,"gosub",      NULL,         5,  0,  0,  JOF_JUMP) \
+    macro(JSOP_RETSUB,    117,"retsub",     NULL,         1,  2,  0,  JOF_BYTE) \
+    \
+    /* More exception handling ops. */ \
+    macro(JSOP_EXCEPTION, 118,"exception",  NULL,         1,  0,  1,  JOF_BYTE) \
+    \
+    /* Embedded lineno to speedup pc->line mapping. */ \
+    macro(JSOP_LINENO,    119,"lineno",     NULL,         3,  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.
+     */ \
+    macro(JSOP_CONDSWITCH,120,"condswitch", NULL,         1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_CASE,      121,"case",       NULL,         5,  2,  1,  JOF_JUMP) \
+    macro(JSOP_DEFAULT,   122,"default",    NULL,         5,  1,  0,  JOF_JUMP) \
+    \
+    /*
+     * ECMA-compliant call to eval op
+     */ \
+    macro(JSOP_EVAL,      123,"eval",       NULL,         3, -1,  1, JOF_UINT16|JOF_INVOKE|JOF_TYPESET) \
+    \
+    macro(JSOP_UNUSED124,  124, "unused124", NULL,      1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED125,  125, "unused125", NULL,      1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED126,  126, "unused126", NULL,      1,  0,  0,  JOF_BYTE) \
+    \
+    /* Prolog bytecodes for defining function, var, and const names. */ \
+    macro(JSOP_DEFFUN,    127,"deffun",     NULL,         5,  0,  0,  JOF_OBJECT) \
+    macro(JSOP_DEFCONST,  128,"defconst",   NULL,         5,  0,  0,  JOF_ATOM) \
+    macro(JSOP_DEFVAR,    129,"defvar",     NULL,         5,  0,  0,  JOF_ATOM) \
+    \
+    /* Push a closure for a named or anonymous function expression. */ \
+    macro(JSOP_LAMBDA,    130, "lambda",    NULL,         5,  0,  1, JOF_OBJECT) \
+    \
+    /* Used for named function expression self-naming, if lightweight. */ \
+    macro(JSOP_CALLEE,    131, "callee",    NULL,         1,  0,  1, JOF_BYTE) \
+    \
+    macro(JSOP_UNUSED132, 132, "unused132", NULL,         1,  0,  0,  JOF_BYTE) \
+    \
+    /* Pick an element from the stack. */ \
+    macro(JSOP_PICK,        133, "pick",      NULL,       2,  0,  0,  JOF_UINT8|JOF_TMPSLOT2) \
+    \
+    /*
+     * Exception handling no-op, for more economical byte-coding than SRC_TRYFIN
+     * srcnote-annotated JSOP_NOPs and to simply stack balance handling.
+     */ \
+    macro(JSOP_TRY,         134,"try",        NULL,       1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_FINALLY,     135,"finally",    NULL,       1,  0,  2,  JOF_BYTE) \
+    \
+    /*
+     * An "aliased variable" is a var, let, or formal arg that is aliased. Sources
+     * of aliasing include: nested functions accessing the vars of an enclosing
+     * function, function statements that are conditionally executed, 'eval',
+     * 'with', and 'arguments'. All of these cases require creating a CallObject to
+     * own the aliased variable.
+     *
+     * An ALIASEDVAR opcode contains the following immediates:
+     *  uint8 hops:  the number of scope objects to skip to find the ScopeObject
+     *               containing the variable being accessed
+     *  uint24 slot: the slot containing the variable in the ScopeObject (this
+     *               'slot' does not include RESERVED_SLOTS).
+     */ \
+    macro(JSOP_GETALIASEDVAR, 136,"getaliasedvar",NULL,   5,  0,  1, JOF_SCOPECOORD|JOF_NAME|JOF_TYPESET) \
+    macro(JSOP_CALLALIASEDVAR,137,"callaliasedvar",NULL,  5,  0,  1, JOF_SCOPECOORD|JOF_NAME|JOF_TYPESET) \
+    macro(JSOP_SETALIASEDVAR, 138,"setaliasedvar",NULL,   5,  1,  1, JOF_SCOPECOORD|JOF_NAME|JOF_SET|JOF_DETECTING) \
+    \
+    macro(JSOP_UNUSED139,  139, "unused139",   NULL,         1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED140,  140, "unused140",   NULL,         1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED141,  141, "unused141",   NULL,         1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED142,  142, "unused142",   NULL,         1,  0,  0,  JOF_BYTE) \
+    \
+    /*
+     * Intrinsic names are emitted instead of JSOP_*NAME ops when the
+     * CompileOptions flag "selfHostingMode" is set.
+     *
+     * They are used in self-hosted code to access other self-hosted values and
+     * intrinsic functions the runtime doesn't give client JS code access to.
+     */ \
+    macro(JSOP_GETINTRINSIC,  143, "getintrinsic",  NULL, 5,  0,  1, JOF_ATOM|JOF_NAME|JOF_TYPESET) \
+    macro(JSOP_CALLINTRINSIC, 144, "callintrinsic", NULL, 5,  0,  1, JOF_ATOM|JOF_NAME|JOF_TYPESET) \
+    macro(JSOP_SETINTRINSIC,  145, "setintrinsic",  NULL, 5,  2,  1, JOF_ATOM|JOF_NAME|JOF_SET|JOF_DETECTING) \
+    macro(JSOP_BINDINTRINSIC, 146, "bindintrinsic", NULL, 5,  0,  1, JOF_ATOM|JOF_NAME|JOF_SET) \
+    \
+    /* Unused. */ \
+    macro(JSOP_UNUSED147,     147,"unused147", NULL,      1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED148,     148,"unused148", NULL,      1,  0,  0,  JOF_BYTE) \
+    \
+    /* Placeholders for a real jump opcode set during backpatch chain fixup. */ \
+    macro(JSOP_BACKPATCH,     149,"backpatch", NULL,      5,  0,  0,  JOF_JUMP) \
+    macro(JSOP_UNUSED150,     150,"unused150", NULL,      1,  0,  0,  JOF_BYTE) \
+    \
+    /* Set pending exception from the stack, to trigger rethrow. */ \
+    macro(JSOP_THROWING,      151,"throwing", NULL,       1,  1,  0,  JOF_BYTE) \
+    \
+    /* Set the return value pseudo-register in stack frame. */ \
+    macro(JSOP_SETRVAL,       152,"setrval",    NULL,       1,  1,  0,  JOF_BYTE) \
+    /*
+     * Stop interpretation and return value set by JSOP_SETRVAL. When not set,
+     * returns UndefinedValue. Also emitted at end of script so interpreter
+     * don't need to check if opcode is still in script range.
+     */ \
+    macro(JSOP_RETRVAL,       153,"retrval",    NULL,       1,  0,  0,  JOF_BYTE) \
+    \
+    /* Free variable references that must either be found on the global or a ReferenceError */ \
+    macro(JSOP_GETGNAME,      154,"getgname",  NULL,       5,  0,  1, JOF_ATOM|JOF_NAME|JOF_TYPESET|JOF_GNAME) \
+    macro(JSOP_SETGNAME,      155,"setgname",  NULL,       5,  2,  1, JOF_ATOM|JOF_NAME|JOF_SET|JOF_DETECTING|JOF_GNAME) \
+    \
+    macro(JSOP_UNUSED156,  156, "unused156",   NULL,         1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED157,  157, "unused157",   NULL,         1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED158,  158, "unused158",   NULL,         1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED159,  159, "unused159",   NULL,         1,  0,  0,  JOF_BYTE) \
+    \
+    /* Regular expression literal requiring special "fork on exec" handling. */ \
+    macro(JSOP_REGEXP,        160,"regexp",   NULL,       5,  0,  1, JOF_REGEXP) \
+    \
+    macro(JSOP_UNUSED161,     161,"unused161",  NULL,     1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED162,     162,"unused162",  NULL,     1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED163,     163,"unused163",  NULL,     1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED164,     164,"unused164",  NULL,     1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED165,     165,"unused165",  NULL,     1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED166,     166,"unused166",  NULL,     1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED167,     167,"unused167",  NULL,     1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED168,     168,"unused168",  NULL,     1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED169,     169,"unused169",  NULL,     1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED170,     170,"unused170",  NULL,     1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED171,     171,"unused171",  NULL,     1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED172,     172,"unused172",  NULL,     1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED173,     173,"unused173",  NULL,     1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED174,     174,"unused174",  NULL,     1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED175,     175,"unused175",  NULL,     1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED176,     176,"unused176",  NULL,     1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED177,     177,"unused177",  NULL,     1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED178,     178,"unused178",  NULL,     1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED179,     179,"unused179",  NULL,     1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED180,     180,"unused180",  NULL,     1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED181,     181,"unused181",  NULL,     1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED182,     182,"unused182",  NULL,     1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED183,     183,"unused183",  NULL,     1,  0,  0,  JOF_BYTE) \
+    \
+    macro(JSOP_CALLPROP,      184,"callprop",   NULL,     5,  1,  1, JOF_ATOM|JOF_PROP|JOF_TYPESET|JOF_TMPSLOT3) \
+    \
+    macro(JSOP_UNUSED185,     185,"unused185",  NULL,     1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED186,     186,"unused186",  NULL,     1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED187,     187,"unused187",  NULL,     1,  0,  0,  JOF_BYTE) \
+    \
+    /* Opcode to hold 24-bit immediate integer operands. */ \
+    macro(JSOP_UINT24,        188,"uint24",     NULL,     4,  0,  1, JOF_UINT24) \
+    \
+    macro(JSOP_UNUSED189,     189,"unused189",   NULL,    1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED190,     190,"unused190",   NULL,    1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED191,     191,"unused191",   NULL,    1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED192,     192,"unused192",   NULL,    1,  0,  0,  JOF_BYTE) \
+    \
+    macro(JSOP_CALLELEM,      193, "callelem",   NULL,    1,  2,  1, JOF_BYTE |JOF_ELEM|JOF_TYPESET|JOF_LEFTASSOC) \
+    \
+    /* __proto__: v inside an object initializer. */ \
+    macro(JSOP_MUTATEPROTO,   194, "mutateproto",NULL,    1,  2,  1, JOF_BYTE) \
+    \
+    /*
+     * Get an extant property value, throwing ReferenceError if the identified
+     * property does not exist.
+     */ \
+    macro(JSOP_GETXPROP,      195,"getxprop",    NULL,    5,  1,  1, JOF_ATOM|JOF_PROP|JOF_TYPESET) \
+    \
+    macro(JSOP_UNUSED196,     196,"unused196",   NULL,    1,  0,  0, JOF_BYTE) \
+    \
+    /* Specialized JSOP_TYPEOF to avoid reporting undefined for typeof(0, undef). */ \
+    macro(JSOP_TYPEOFEXPR,    197,"typeofexpr",  NULL,    1,  1,  1, JOF_BYTE|JOF_DETECTING) \
+    \
+    /* Block-local scope support. */ \
+    macro(JSOP_PUSHBLOCKSCOPE,198,"pushblockscope", NULL, 5,  0,  0,  JOF_OBJECT) \
+    macro(JSOP_POPBLOCKSCOPE, 199,"popblockscope", NULL,  1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_DEBUGLEAVEBLOCK, 200,"debugleaveblock", NULL, 1,  0,  0,  JOF_BYTE) \
+    \
+    macro(JSOP_UNUSED201,     201,"unused201",  NULL,     1,  0,  0,  JOF_BYTE) \
+    \
+    /* Generator and array comprehension support. */ \
+    macro(JSOP_GENERATOR,     202,"generator",   NULL,    1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_YIELD,         203,"yield",       NULL,    1,  1,  1,  JOF_BYTE) \
+    macro(JSOP_ARRAYPUSH,     204,"arraypush",   NULL,    1,  2,  0,  JOF_BYTE) \
+    \
+    macro(JSOP_UNUSED205,     205, "unused205",    NULL,  1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED206,     206, "unused206",    NULL,  1,  0,  0,  JOF_BYTE) \
+    \
+    macro(JSOP_UNUSED207,     207, "unused207",    NULL,  1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED208,     208, "unused208",    NULL,  1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED209,     209, "unused209",    NULL,  1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED210,     210, "unused210",    NULL,  1,  0,  0,  JOF_BYTE) \
+    \
+    macro(JSOP_CALLGNAME,     211, "callgname",    NULL,  5,  0,  1,  JOF_ATOM|JOF_NAME|JOF_TYPESET|JOF_GNAME) \
+    macro(JSOP_CALLLOCAL,     212, "calllocal",    NULL,  4,  0,  1,  JOF_LOCAL|JOF_NAME) \
+    macro(JSOP_CALLARG,       213, "callarg",      NULL,  3,  0,  1,  JOF_QARG |JOF_NAME) \
+    macro(JSOP_BINDGNAME,     214, "bindgname",    NULL,  5,  0,  1,  JOF_ATOM|JOF_NAME|JOF_SET|JOF_GNAME) \
+    \
+    /* Opcodes to hold 8-bit and 32-bit immediate integer operands. */ \
+    macro(JSOP_INT8,          215, "int8",         NULL,  2,  0,  1, JOF_INT8) \
+    macro(JSOP_INT32,         216, "int32",        NULL,  5,  0,  1, JOF_INT32) \
+    \
+    /* Get the value of the 'length' property from a stacked value. */ \
+    macro(JSOP_LENGTH,        217, "length",       NULL,  5,  1,  1, JOF_ATOM|JOF_PROP|JOF_TYPESET|JOF_TMPSLOT3) \
+    \
+    /*
+     * Push a JSVAL_HOLE value onto the stack, representing an omitted property in
+     * an array literal (e.g. property 0 in the array [, 1]).  This opcode is used
+     * with the JSOP_NEWARRAY opcode.
+     */ \
+    macro(JSOP_HOLE,          218, "hole",         NULL,  1,  0,  1,  JOF_BYTE) \
+    \
+    macro(JSOP_UNUSED219,     219,"unused219",     NULL,  1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED220,     220,"unused220",     NULL,  1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED221,     221,"unused221",     NULL,  1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED222,     222,"unused222",     NULL,  1,  0,  0,  JOF_BYTE) \
+    macro(JSOP_UNUSED223,     223,"unused223",     NULL,  1,  0,  0,  JOF_BYTE) \
+    \
+    macro(JSOP_REST,          224, "rest",         NULL,  1,  0,  1,  JOF_BYTE|JOF_TYPESET) \
+    \
+    /* Pop the stack, convert to a jsid (int or string), and push back. */ \
+    macro(JSOP_TOID,          225, "toid",         NULL,  1,  1,  1,  JOF_BYTE) \
+    \
+    /* Push the implicit 'this' value for calls to the associated name. */ \
+    macro(JSOP_IMPLICITTHIS,  226, "implicitthis", "",    5,  0,  1,  JOF_ATOM) \
+    \
+    /*
+     * This opcode is the target of the entry jump for some loop. The uint8 argument
+     * is the loop depth. This value starts at 1 and is just a hint: deeply
+     * nested loops all have the same value.
+     */ \
+    macro(JSOP_LOOPENTRY,     227, "loopentry",    NULL,  2,  0,  0,  JOF_UINT8)
+
+/*
+ * In certain circumstances it may be useful to "pad out" the opcode space to
+ * a power of two.  Use this macro to do so.
+ */
+#define FOR_EACH_TRAILING_UNUSED_OPCODE(macro) \
+    macro(228) \
+    macro(229) \
+    macro(230) \
+    macro(231) \
+    macro(232) \
+    macro(233) \
+    macro(234) \
+    macro(235) \
+    macro(236) \
+    macro(237) \
+    macro(238) \
+    macro(239) \
+    macro(240) \
+    macro(241) \
+    macro(242) \
+    macro(243) \
+    macro(244) \
+    macro(245) \
+    macro(246) \
+    macro(247) \
+    macro(248) \
+    macro(249) \
+    macro(250) \
+    macro(251) \
+    macro(252) \
+    macro(253) \
+    macro(254) \
+    macro(255)
+
+namespace js {
+
+// Sanity check that opcode values and trailing unused opcodes completely cover
+// the [0, 256) range.  Avert your eyes!  You don't want to know how the
+// sausage gets made.
+
+#define VALUE_AND_VALUE_PLUS_ONE(op, val, ...) \
+    val) && (val + 1 ==
+#define TRAILING_VALUE_AND_VALUE_PLUS_ONE(val) \
+    val) && (val + 1 ==
+static_assert((0 ==
+               FOR_EACH_OPCODE(VALUE_AND_VALUE_PLUS_ONE)
+               FOR_EACH_TRAILING_UNUSED_OPCODE(TRAILING_VALUE_AND_VALUE_PLUS_ONE)
+               256),
+              "opcode values and trailing unused opcode values monotonically "
+              "increase from zero to 255");
+#undef TRAILING_VALUE_AND_VALUE_PLUS_ONE
+#undef VALUE_AND_VALUE_PLUS_ONE
+
+// Define JSOP_*_LENGTH constants for all ops.
+#define DEFINE_LENGTH_CONSTANT(op, val, name, image, len, ...) \
+    MOZ_CONSTEXPR_VAR size_t op##_LENGTH = len;
+FOR_EACH_OPCODE(DEFINE_LENGTH_CONSTANT)
+#undef DEFINE_LENGTH_CONSTANT
+
+} // namespace js
+
+#endif // vm_Opcodes_h
diff --git a/js/src/vm/Stack.cpp b/js/src/vm/Stack.cpp
index dab973f64851..053252d1859b 100644
--- a/js/src/vm/Stack.cpp
+++ b/js/src/vm/Stack.cpp
@@ -8,7 +8,6 @@
 
 #include "mozilla/PodOperations.h"
 
-#include "jsautooplen.h"
 #include "jscntxt.h"
 
 #include "gc/Marking.h"
@@ -16,6 +15,7 @@
 #include "jit/BaselineFrame.h"
 #include "jit/JitCompartment.h"
 #endif
+#include "vm/Opcodes.h"
 
 #include "jit/IonFrameIterator-inl.h"
 #include "vm/Interpreter-inl.h"