path: root/upb/pb/compile_decoder_x64.h

/*
** This file has been pre-processed with DynASM.
** http://luajit.org/dynasm.html
** DynASM version 1.3.0, DynASM x64 version 1.3.0
** DO NOT EDIT! The original file is in "upb/pb/compile_decoder_x64.dasc".
*/

#if DASM_VERSION != 10300
#error "Version mismatch between DynASM and included encoding engine"
#endif

# 1 "upb/pb/compile_decoder_x64.dasc"
/*|// */
/*|// upb - a minimalist implementation of protocol buffers. */
/*|// */
/*|// Copyright (c) 2011-2013 Google Inc.  See LICENSE for details. */
/*|// Author: Josh Haberman <jhaberman@gmail.com> */
/*|// */
/*|// JIT compiler for upb_pbdecoder on x86-64.  Generates machine code from the */
/*|// bytecode generated in compile_decoder.c. */
/*| */
/*|.arch x64 */
/*|.actionlist upb_jit_actionlist */
static const unsigned char upb_jit_actionlist[2467] = {
  249,255,248,10,248,1,85,65,87,65,86,65,85,65,84,83,72,137,252,243,73,137,
  252,255,72,184,237,237,65,84,73,137,228,72,129,228,239,252,255,208,76,137,
  228,65,92,133,192,15,137,244,247,73,137,167,233,72,137,216,77,139,183,233,
  73,139,159,233,77,139,167,233,77,139,174,233,73,139,174,233,73,43,175,233,
  73,3,175,233,73,139,151,233,72,133,210,15,133,244,248,252,255,208,73,139,
  135,233,73,199,135,233,0,0,0,0,248,1,255,91,65,92,65,93,65,94,65,95,93,195,
  248,2,73,139,183,233,72,41,212,72,137,231,72,184,237,237,65,84,73,137,228,
  72,129,228,239,252,255,208,76,137,228,65,92,195,255,248,11,73,139,191,233,
  72,137,230,73,139,151,233,72,41,226,73,137,151,233,137,195,72,184,237,237,
  65,84,73,137,228,72,129,228,239,252,255,208,76,137,228,65,92,137,216,73,139,
  167,233,91,65,92,65,93,65,94,65,95,93,195,255,248,12,73,57,159,233,15,132,
  244,247,73,137,159,233,248,1,77,137,183,233,73,137,159,233,77,137,167,233,
  73,137,175,233,73,43,175,233,73,3,175,233,73,137,174,233,77,137,174,233,76,
  137,252,255,72,184,237,237,65,84,73,137,228,72,129,228,239,252,255,208,76,
  137,228,65,92,252,233,244,11,255,248,13,248,1,77,137,174,233,73,137,159,233,
  255,76,57,227,15,132,244,253,255,76,137,225,72,41,217,72,131,252,249,1,15,
  130,244,253,255,15,182,19,132,210,15,137,244,254,248,7,232,244,14,248,8,72,
  131,195,1,72,137,252,233,72,41,217,72,41,209,15,130,244,250,73,137,142,233,
  77,59,183,233,15,132,244,249,73,129,198,239,72,137,221,72,1,213,65,199,134,
  233,0,0,0,0,72,133,201,15,132,244,248,77,139,167,233,72,57,252,235,15,135,
  244,248,76,57,229,15,135,244,248,255,73,137,252,236,248,2,195,248,3,73,139,
  159,233,76,137,252,255,255,72,190,237,237,255,190,237,255,49,252,246,255,
  72,184,237,237,65,84,73,137,228,72,129,228,239,252,255,208,76,137,228,65,
  92,232,244,12,252,233,244,1,248,4,73,139,159,233,76,137,252,255,255,72,184,
  237,237,65,84,73,137,228,72,129,228,239,252,255,208,76,137,228,65,92,232,
  244,12,252,233,244,1,255,248,15,76,137,252,255,137,214,15,182,209,77,137,
  183,233,73,137,159,233,77,137,167,233,73,137,175,233,73,43,175,233,73,3,175,
  233,73,137,174,233,77,137,174,233,72,184,237,237,65,84,73,137,228,72,129,
  228,239,252,255,208,76,137,228,65,92,77,139,183,233,73,139,159,233,77,139,
  167,233,77,139,174,233,73,139,174,233,73,43,175,233,73,3,175,233,129,252,
  248,239,255,15,133,244,247,195,248,1,129,252,248,239,15,132,244,247,232,244,
  11,248,1,49,192,195,255,248,16,248,17,72,131,252,236,8,248,1,72,199,4,36,
  0,0,0,0,76,137,252,255,72,137,230,73,137,159,233,77,137,183,233,73,137,159,
  233,77,137,167,233,73,137,175,233,73,43,175,233,73,3,175,233,73,137,174,233,
  77,137,174,233,72,184,237,237,65,84,73,137,228,72,129,228,239,252,255,208,
  76,137,228,65,92,77,139,183,233,73,139,159,233,77,139,167,233,77,139,174,
  233,73,139,174,233,255,73,43,175,233,73,3,175,233,133,192,15,137,244,248,
  72,139,20,36,252,242,15,16,4,36,72,131,196,8,72,131,252,235,4,73,137,159,
  233,195,248,2,232,244,11,252,233,244,1,255,248,18,248,19,72,131,252,236,8,
  248,1,72,199,4,36,0,0,0,0,76,137,252,255,72,137,230,73,137,159,233,77,137,
  183,233,73,137,159,233,77,137,167,233,73,137,175,233,73,43,175,233,73,3,175,
  233,73,137,174,233,77,137,174,233,72,184,237,237,65,84,73,137,228,72,129,
  228,239,252,255,208,76,137,228,65,92,77,139,183,233,73,139,159,233,77,139,
  167,233,77,139,174,233,73,139,174,233,255,73,43,175,233,73,3,175,233,133,
  192,15,137,244,248,72,139,20,36,252,242,15,16,4,36,72,131,196,8,72,131,252,
  235,8,73,137,159,233,195,248,2,232,244,11,252,233,244,1,255,248,20,248,21,
  255,76,57,227,15,132,244,247,255,76,137,225,72,41,217,72,131,252,249,16,15,
  130,244,247,255,252,243,15,111,3,102,15,215,192,252,247,208,15,188,192,60,
  10,15,131,244,22,72,1,195,195,248,1,72,141,139,233,72,137,216,76,57,225,73,
  15,71,204,248,2,72,57,200,15,132,244,22,252,246,0,128,15,132,244,249,72,131,
  192,1,252,233,244,2,248,3,72,137,195,195,255,248,23,72,131,252,236,16,248,
  1,72,57,252,235,15,133,244,248,72,131,196,16,49,192,195,248,2,76,137,252,
  255,72,137,230,77,137,183,233,73,137,159,233,77,137,167,233,73,137,175,233,
  73,43,175,233,73,3,175,233,73,137,174,233,77,137,174,233,72,184,237,237,65,
  84,73,137,228,72,129,228,239,252,255,208,76,137,228,65,92,77,139,183,233,
  73,139,159,233,77,139,167,233,77,139,174,233,255,73,139,174,233,73,43,175,
  233,73,3,175,233,131,252,248,0,15,141,244,249,139,20,36,72,131,196,16,195,
  248,3,232,244,11,252,233,244,1,255,248,14,248,24,255,76,57,227,15,132,244,
  22,255,76,137,225,72,41,217,72,131,252,249,10,15,130,244,22,255,72,137,223,
  72,184,237,237,65,84,73,137,228,72,129,228,239,252,255,208,76,137,228,65,
  92,72,133,192,15,132,244,22,72,137,195,72,131,252,235,1,73,137,159,233,195,
  255,248,22,72,131,252,236,8,248,1,72,199,4,36,0,0,0,0,76,137,252,255,72,137,
  230,73,137,159,233,77,137,183,233,73,137,159,233,77,137,167,233,73,137,175,
  233,73,43,175,233,73,3,175,233,73,137,174,233,77,137,174,233,72,184,237,237,
  65,84,73,137,228,72,129,228,239,252,255,208,76,137,228,65,92,77,139,183,233,
  73,139,159,233,77,139,167,233,77,139,174,233,73,139,174,233,73,43,175,233,
  255,73,3,175,233,133,192,15,137,244,248,72,139,20,36,252,242,15,16,4,36,72,
  131,196,8,72,131,252,235,1,73,137,159,233,195,248,2,232,244,11,252,233,244,
  1,255,248,25,72,131,252,236,8,72,137,52,36,248,1,76,137,252,255,77,137,183,
  233,73,137,159,233,77,137,167,233,73,137,175,233,73,43,175,233,73,3,175,233,
  73,137,174,233,77,137,174,233,73,137,159,233,72,184,237,237,65,84,73,137,
  228,72,129,228,239,252,255,208,76,137,228,65,92,77,139,183,233,73,139,159,
  233,77,139,167,233,77,139,174,233,73,139,174,233,73,43,175,233,255,73,3,175,
  233,131,252,248,0,15,141,244,248,72,131,196,8,195,248,2,232,244,11,72,139,
  52,36,72,57,252,235,15,133,244,1,184,237,72,131,196,8,195,255,248,26,81,82,
  72,131,252,236,16,72,137,252,247,72,137,214,72,137,226,72,184,237,237,65,
  84,73,137,228,72,129,228,239,252,255,208,76,137,228,65,92,72,131,196,16,90,
  89,132,192,15,132,244,248,72,139,68,36,224,195,248,2,72,49,192,72,252,247,
  208,195,255,76,57,227,15,133,244,249,255,76,137,225,72,41,217,72,129,252,
  249,239,15,131,244,249,255,248,2,255,232,244,14,255,232,244,24,255,232,244,
  17,255,232,244,19,255,252,233,244,250,255,248,3,255,139,19,255,72,139,19,
  255,252,243,15,16,3,255,252,242,15,16,3,255,15,182,19,132,210,15,136,244,
  2,255,248,4,255,137,208,209,252,234,131,224,1,252,247,216,49,194,255,72,137,
  208,72,209,252,234,72,131,224,1,72,252,247,216,72,49,194,255,72,133,210,15,
  149,210,255,73,137,149,233,255,65,137,149,233,255,252,242,65,15,17,133,233,
  255,252,243,65,15,17,133,233,255,65,136,149,233,255,65,128,141,233,235,255,
  76,137,252,239,255,72,184,237,237,65,84,73,137,228,72,129,228,239,252,255,
  208,76,137,228,65,92,255,132,192,15,133,244,251,232,244,12,252,233,244,1,
  248,5,255,72,129,195,239,255,232,244,20,255,232,244,21,255,232,244,16,255,
  232,244,18,255,252,246,3,128,15,133,244,2,255,249,248,1,255,76,57,227,15,
  132,244,252,255,76,137,225,72,41,217,72,131,252,249,2,15,130,244,252,255,
  15,182,19,132,210,15,137,244,253,15,182,139,233,132,201,15,136,244,252,193,
  225,7,131,226,127,9,202,72,131,195,2,252,233,244,254,248,6,232,244,23,133,
  192,15,133,244,254,195,248,7,72,131,195,1,248,8,137,209,193,252,234,3,128,
  225,7,255,248,2,129,252,250,239,255,15,131,244,253,255,15,131,244,251,255,
  72,184,237,237,72,139,4,208,255,72,139,4,213,237,255,248,3,56,200,255,15,
  133,244,252,255,15,133,244,251,255,72,193,232,16,72,141,21,244,250,249,248,
  4,72,1,208,195,248,5,72,184,237,237,73,137,134,233,232,244,15,133,192,15,
  132,244,1,72,141,5,244,255,195,255,248,6,56,204,15,133,244,5,72,129,194,239,
  255,252,233,244,26,255,248,7,255,232,244,26,252,233,244,3,255,76,57,227,15,
  133,244,247,255,76,137,225,72,41,217,72,129,252,249,239,15,131,244,247,255,
  232,244,25,129,252,248,239,15,132,244,249,129,252,248,239,15,132,245,252,
  233,244,251,255,128,59,235,255,102,129,59,238,255,102,129,59,238,15,133,244,
  248,128,187,233,235,248,2,255,129,59,239,255,129,59,239,15,133,244,249,128,
  187,233,235,255,15,132,244,250,248,3,255,232,245,72,133,192,15,132,245,252,
  255,224,255,252,233,245,255,248,4,72,129,195,239,248,5,255,248,1,76,137,252,
  239,255,132,192,15,133,244,248,232,244,12,252,233,244,1,248,2,255,144,255,
  248,9,255,73,139,151,233,72,184,237,237,65,84,73,137,228,72,129,228,239,252,
  255,208,76,137,228,65,92,255,249,249,72,131,252,236,8,255,72,137,252,234,
  72,41,218,255,72,133,192,15,133,244,248,232,244,12,252,233,244,1,248,2,255,
  73,137,197,255,72,57,252,235,15,132,244,250,248,1,76,57,227,15,133,244,248,
  232,244,12,252,233,244,1,248,2,255,72,137,218,76,137,225,72,41,217,77,139,
  135,233,72,184,237,237,65,84,73,137,228,72,129,228,239,252,255,208,76,137,
  228,65,92,72,1,195,255,76,57,227,15,132,244,249,232,244,27,248,3,255,76,137,
  227,255,72,57,252,235,15,133,244,1,248,4,255,77,137,174,233,73,199,134,233,
  0,0,0,0,77,59,183,233,15,132,244,28,73,129,198,239,65,199,134,233,237,255,
  232,244,13,255,73,129,252,238,239,77,139,174,233,255,77,139,167,233,73,3,
  174,233,73,59,175,233,15,130,244,247,76,57,229,15,135,244,247,73,137,252,
  236,248,1,255,72,57,221,15,132,245,255,232,245,255,248,9,72,131,196,8,195,
  255
};

# 12 "upb/pb/compile_decoder_x64.dasc"
/*|.globals UPB_JIT_GLOBAL_ */
enum {
  UPB_JIT_GLOBAL_enterjit,
  UPB_JIT_GLOBAL_exitjit,
  UPB_JIT_GLOBAL_suspend,
  UPB_JIT_GLOBAL_pushlendelim,
  UPB_JIT_GLOBAL_decodev32_fallback,
  UPB_JIT_GLOBAL_parse_unknown,
  UPB_JIT_GLOBAL_skipf32_fallback,
  UPB_JIT_GLOBAL_decodef32_fallback,
  UPB_JIT_GLOBAL_skipf64_fallback,
  UPB_JIT_GLOBAL_decodef64_fallback,
  UPB_JIT_GLOBAL_skipv32_fallback,
  UPB_JIT_GLOBAL_skipv64_fallback,
  UPB_JIT_GLOBAL_decode_varint_slow,
  UPB_JIT_GLOBAL_decode_unknown_tag_fallback,
  UPB_JIT_GLOBAL_decodev64_fallback,
  UPB_JIT_GLOBAL_checktag_fallback,
  UPB_JIT_GLOBAL_hashlookup,
  UPB_JIT_GLOBAL_strret_fallback,
  UPB_JIT_GLOBAL_err,
  UPB_JIT_GLOBAL__MAX
};
# 13 "upb/pb/compile_decoder_x64.dasc"
/*|.globalnames upb_jit_globalnames */
static const char *const upb_jit_globalnames[] = {
  "enterjit",
  "exitjit",
  "suspend",
  "pushlendelim",
  "decodev32_fallback",
  "parse_unknown",
  "skipf32_fallback",
  "decodef32_fallback",
  "skipf64_fallback",
  "decodef64_fallback",
  "skipv32_fallback",
  "skipv64_fallback",
  "decode_varint_slow",
  "decode_unknown_tag_fallback",
  "decodev64_fallback",
  "checktag_fallback",
  "hashlookup",
  "strret_fallback",
  "err",
  (const char *)0
};
# 14 "upb/pb/compile_decoder_x64.dasc"
/*| */
/*|// Calling conventions.  Note -- this will need to be changed for */
/*|// Windows, which uses a different calling convention! */
/*|.define ARG1_64,   rdi */
/*|.define ARG2_8,    r6b  // DynASM's equivalent to "sil" -- low byte of esi. */
/*|.define ARG2_32,   esi */
/*|.define ARG2_64,   rsi */
/*|.define ARG3_8,    dl */
/*|.define ARG3_32,   edx */
/*|.define ARG3_64,   rdx */
/*|.define ARG4_64,   rcx */
/*|.define ARG5_64,   r8 */
/*|.define XMMARG1,   xmm0 */
/*| */
/*|// Register allocation / type map. */
/*|// ALL of the code in this file uses these register allocations. */
/*|// When we "call" within this file, we do not use regular calling */
/*|// conventions, but of course when calling to user callbacks we must. */
/*|.define PTR,       rbx                       // DECODER->ptr      (unsynced) */
/*|.define DATAEND,   r12                       // DECODER->data_end (unsynced) */
/*|.define CLOSURE,   r13                       // FRAME->closure    (unsynced) */
/*|.type   FRAME,     upb_pbdecoder_frame, r14  // DECODER->top      (unsynced) */
#define Dt1(_V) (int)(ptrdiff_t)&(((upb_pbdecoder_frame *)0)_V)
# 36 "upb/pb/compile_decoder_x64.dasc"
/*|.type   DECODER,   upb_pbdecoder, r15        // DECODER           (immutable) */
#define Dt2(_V) (int)(ptrdiff_t)&(((upb_pbdecoder *)0)_V)
# 37 "upb/pb/compile_decoder_x64.dasc"
/*|.define DELIMEND,  rbp */
/*| */
/*| // Spills unsynced registers back to memory. */
/*|.macro commit_regs */
/*|  mov  DECODER->top, FRAME */
/*|  mov  DECODER->ptr, PTR */
/*|  mov  DECODER->data_end, DATAEND */
/*|  // We don't guarantee that delim_end is NULL when out of range like the */
/*|  // interpreter does. */
/*|  mov  DECODER->delim_end, DELIMEND */
/*|  sub  DELIMEND, DECODER->buf */
/*|  add  DELIMEND, DECODER->bufstart_ofs */
/*|  mov  FRAME->end_ofs, DELIMEND */
/*|  mov  FRAME->sink.closure, CLOSURE */
/*|.endmacro */
/*| */
/*| // Loads unsynced registers from memory back into registers. */
/*|.macro load_regs */
/*|  mov  FRAME, DECODER->top */
/*|  mov  PTR, DECODER->ptr */
/*|  mov  DATAEND, DECODER->data_end */
/*|  mov  CLOSURE, FRAME->sink.closure */
/*|  mov  DELIMEND, FRAME->end_ofs */
/*|  sub  DELIMEND, DECODER->bufstart_ofs */
/*|  add  DELIMEND, DECODER->buf */
/*|.endmacro */
/*| */
/*| // Calls an external C function at address "addr". */
/*|.macro callp, addr */
/*|    mov64  rax, (uintptr_t)addr */
/*| */
/*|    // Stack must be 16-byte aligned (x86-64 ABI requires this). */
/*|    // */
/*|    // OPT: possibly remove this by statically ensuring correct alignment. */
/*|    // */
/*|    // OPT: use "call rel32" where possible. */
/*|    push   r12 */
/*|    mov    r12, rsp */
/*|    and    rsp, 0xfffffffffffffff0UL   // Align stack. */
/*|    call   rax */
/*|    mov    rsp, r12 */
/*|    pop    r12 */
/*|.endmacro */
/*| */
/*|.macro ld64, val */
/*|| { */
/*|| uintptr_t v = (uintptr_t)val; */
/*|| if (v > 0xffffffff) { */
/*|    mov64  ARG2_64, v */
/*|| } else if (v) { */
/*|    mov    ARG2_32, v */
/*|| } else { */
/*|    xor    ARG2_32, ARG2_32 */
/*|| } */
/*|| } */
/*|.endmacro */
/*| */
/*|.macro load_handler_data, h, arg */
/*|  ld64   upb_handlers_gethandlerdata(h, arg) */
/*|.endmacro */
/*| */
/*|.macro chkeob, bytes, target */
/*|| if (bytes == 1) { */
/*|  cmp    PTR, DATAEND */
/*|  je     target */
/*|| } else { */
/*|  mov    rcx, DATAEND */
/*|  sub    rcx, PTR */
/*|  cmp    rcx, bytes */
/*|  jb     target */
/*|| } */
/*|.endmacro */
/*| */
/*|.macro chkneob, bytes, target */
/*|| if (bytes == 1) { */
/*|  cmp    PTR, DATAEND */
/*|  jne    target */
/*|| } else { */
/*|  mov    rcx, DATAEND */
/*|  sub    rcx, PTR */
/*|  cmp    rcx, bytes */
/*|  jae    target */
/*|| } */
/*|.endmacro */

/*|.macro sethas, reg, hasbit */
/*|| if (hasbit >= 0) { */
/*|    or   byte [reg + ((uint32_t)hasbit / 8)], (1 << ((uint32_t)hasbit % 8)) */
/*|| } */
/*|.endmacro */
/*| */
/*| // Decodes 32-bit varint into rdx, inlining 1 byte. */
/*|.macro dv32 */
/*|  chkeob  1, >7 */
/*|  movzx   edx, byte [PTR] */
/*|  test    dl, dl */
/*|  jns     >8 */
/*|7: */
/*|  call    ->decodev32_fallback */
/*|8: */
/*|  add     PTR, 1 */
/*|.endmacro */

#define DECODE_EOF -3

static upb_func *gethandler(const upb_handlers *h, upb_selector_t sel) {
  return h ? upb_handlers_gethandler(h, sel) : NULL;
}

/* Defines an "assembly label" for the current code generation offset.
 * This label exists *purely* for debugging purposes: it is emitted into
 * the .so, and printed as part of JIT debugging output when UPB_JIT_LOAD_SO is
 * defined.
 *
 * We would define this in the .c file except that it conditionally defines a
 * pclabel. */
static void asmlabel(jitcompiler *jc, const char *fmt, ...) {
#ifndef NDEBUG
  int ofs = jc->dynasm->section->ofs;
  UPB_ASSERT(ofs != jc->lastlabelofs);
  jc->lastlabelofs = ofs;
#endif

#ifndef UPB_JIT_LOAD_SO
  UPB_UNUSED(jc);
  UPB_UNUSED(fmt);
#else
  va_list args;
  va_start(args, fmt);
  char *str = upb_vasprintf(fmt, args);
  va_end(args);

  int pclabel = alloc_pclabel(jc);
  /* Normally we would prefer to allocate this inline with the codegen,
   * ie.
   *   |=>asmlabel(...)
   * But since we do this conditionally, only when UPB_JIT_LOAD_SO is defined,
   * we do it here instead. */
  /*|=>pclabel: */
  dasm_put(Dst, 0, pclabel);
# 176 "upb/pb/compile_decoder_x64.dasc"
  upb_inttable_insert(&jc->asmlabels, pclabel, upb_value_ptr(str));
#endif
}

/* Should only be called when the associated handler is known to exist. */
static bool alwaysok(const upb_handlers *h, upb_selector_t sel) {
  upb_handlerattr attr = UPB_HANDLERATTR_INITIALIZER;
  bool ok = upb_handlers_getattr(h, sel, &attr);
  bool ret;

  UPB_ASSERT(ok);
  ret = upb_handlerattr_alwaysok(&attr);
  upb_handlerattr_uninit(&attr);
  return ret;
}

/* Emit static assembly routines; code that does not vary based on the message
 * schema.  Since it's not input-dependent, we only need one single copy of it.
 * For the moment we generate a single copy per generated handlers.  Eventually
 * we should generate this code at compile time and link it into the binary so
 * we have one copy total.  To do that we'll want to be sure that it is within
 * 2GB of our JIT code, so that branches between the two are near (rel32).
 *
 * We'd put this assembly in a .s file directly, but DynASM's ability to
 * calculate structure offsets automatically is too useful to pass up (it's way
 * more convenient to write DECODER->sink than [rbx + 0x96], especially since
 * the latter would have to be changed whenever the structure is updated). */
static void emit_static_asm(jitcompiler *jc) {
  /*| // Trampolines for entering/exiting the JIT.  These are a bit tricky to */
  /*| // support full resuming; when we suspend we copy the JIT's portion of */
  /*| // the call stack into the upb_pbdecoder and restore it when we resume. */
  asmlabel(jc, "enterjit");
  /*|->enterjit: */
  /*|1: */
  /*|  push  rbp */
  /*|  push  r15 */
  /*|  push  r14 */
  /*|  push  r13 */
  /*|  push  r12 */
  /*|  push  rbx */
  /*| */
  /*|  mov   rbx, ARG2_64  // Preserve JIT method. */
  /*| */
  /*|  mov   DECODER, rdi */
  /*|  callp upb_pbdecoder_resume  // Same args as us; reuse regs. */
  /*|  test  eax, eax */
  /*|  jns   >1 */
  /*|  mov   DECODER->saved_rsp, rsp */
  /*|  mov   rax, rbx */
  /*|  load_regs */
  /*| */
  /*|  // Test whether we have a saved stack to resume. */
  /*|  mov   ARG3_64, DECODER->call_len */
  /*|  test  ARG3_64, ARG3_64 */
  /*|  jnz   >2 */
  /*| */
  /*|  call  rax */
  /*| */
  /*|  mov   rax, DECODER->size_param */
  /*|  mov   qword DECODER->call_len, 0 */
  /*|1: */
  /*|  pop   rbx */
  dasm_put(Dst, 2, (unsigned int)((uintptr_t)upb_pbdecoder_resume), (unsigned int)(((uintptr_t)upb_pbdecoder_resume)>>32), 0xfffffffffffffff0UL, Dt2(->saved_rsp), Dt2(->top), Dt2(->ptr), Dt2(->data_end), Dt1(->sink.closure), Dt1(->end_ofs), Dt2(->bufstart_ofs), Dt2(->buf), Dt2(->call_len), Dt2(->size_param), Dt2(->call_len));
# 238 "upb/pb/compile_decoder_x64.dasc"
  /*|  pop   r12 */
  /*|  pop   r13 */
  /*|  pop   r14 */
  /*|  pop   r15 */
  /*|  pop   rbp */
  /*|  ret */
  /*| */
  /*|2: */
  /*|  // Resume decoder. */
  /*|  mov   ARG2_64, DECODER->callstack */
  /*|  sub   rsp, ARG3_64 */
  /*|  mov   ARG1_64, rsp */
  /*|  callp memcpy  // Restore stack. */
  /*|  ret  // Return to resumed function (not ->enterjit caller). */
  /*| */
  /*| // Other code can call this to suspend the JIT. */
  /*| // To the calling code, it will appear that the function returns when */
  /*| // the JIT resumes, and more buffer space will be available. */
  /*| // Args: eax=the value that decode() should return. */
  dasm_put(Dst, 115, Dt2(->callstack), (unsigned int)((uintptr_t)memcpy), (unsigned int)(((uintptr_t)memcpy)>>32), 0xfffffffffffffff0UL);
# 257 "upb/pb/compile_decoder_x64.dasc"
  asmlabel(jc, "exitjit");
  /*|->exitjit: */
  /*|  // Save the stack into DECODER->callstack. */
  /*|  mov   ARG1_64, DECODER->callstack */
  /*|  mov   ARG2_64, rsp */
  /*|  mov   ARG3_64, DECODER->saved_rsp */
  /*|  sub   ARG3_64, rsp */
  /*|  mov   DECODER->call_len, ARG3_64  // Preserve len for next resume. */
  /*|  mov   ebx, eax  // Preserve return value across memcpy. */
  /*|  callp memcpy    // Copy stack into decoder. */
  /*|  mov   eax, ebx  // This will be our return value. */
  /*| */
  /*|  // Must NOT do this before the memcpy(), otherwise memcpy() will */
  /*|  // clobber the stack we are trying to save! */
  /*|  mov   rsp, DECODER->saved_rsp */
  /*|  pop   rbx */
  /*|  pop   r12 */
  /*|  pop   r13 */
  /*|  pop   r14 */
  /*|  pop   r15 */
  /*|  pop   rbp */
  /*|  ret */
  /*| */
  /*| // Like suspend() in the C decoder, except that the function appears */
  /*| // (from the caller's perspective) not to return until the decoder is */
  /*| // resumed. */
  dasm_put(Dst, 161, Dt2(->callstack), Dt2(->saved_rsp), Dt2(->call_len), (unsigned int)((uintptr_t)memcpy), (unsigned int)(((uintptr_t)memcpy)>>32), 0xfffffffffffffff0UL, Dt2(->saved_rsp));
# 283 "upb/pb/compile_decoder_x64.dasc"
  asmlabel(jc, "suspend");
  /*|->suspend: */
  /*|  cmp   DECODER->ptr, PTR */
  /*|  je    >1 */
  /*|  mov   DECODER->checkpoint, PTR */
  /*|1: */
  /*|  commit_regs */
  /*|  mov   rdi, DECODER */
  /*|  callp upb_pbdecoder_suspend */
  /*|  jmp   ->exitjit */
  /*| */
  dasm_put(Dst, 222, Dt2(->ptr), Dt2(->checkpoint), Dt2(->top), Dt2(->ptr), Dt2(->data_end), Dt2(->delim_end), Dt2(->buf), Dt2(->bufstart_ofs), Dt1(->end_ofs), Dt1(->sink.closure), (unsigned int)((uintptr_t)upb_pbdecoder_suspend), (unsigned int)(((uintptr_t)upb_pbdecoder_suspend)>>32), 0xfffffffffffffff0UL);
# 294 "upb/pb/compile_decoder_x64.dasc"
  asmlabel(jc, "pushlendelim");
  /*|->pushlendelim: */
  /*|1: */
  /*|  mov   FRAME->sink.closure, CLOSURE */
  /*|  mov   DECODER->checkpoint, PTR */
  /*|  dv32 */
  dasm_put(Dst, 300, Dt1(->sink.closure), Dt2(->checkpoint));
   if (1 == 1) {
  dasm_put(Dst, 313);
   } else {
  dasm_put(Dst, 321);
   }
# 300 "upb/pb/compile_decoder_x64.dasc"
  /*|  mov   rcx, DELIMEND */
  /*|  sub   rcx, PTR */
  /*|  sub   rcx, rdx */
  /*|  jb    >4   // Len is greater than enclosing message. */
  /*|  mov   FRAME->end_ofs, rcx */
  /*|  cmp   FRAME, DECODER->limit */
  /*|  je    >3   // Stack overflow */
  /*|  add   FRAME, sizeof(upb_pbdecoder_frame) */
  /*|  mov   DELIMEND, PTR */
  /*|  add   DELIMEND, rdx */
  /*|  mov   dword FRAME->groupnum, 0 */
  /*|  test  rcx, rcx */
  /*|  jz    >2 */
  /*|  mov   DATAEND, DECODER->end */
  /*|  cmp   PTR, DELIMEND */
  /*|  ja    >2 */
  /*|  cmp   DELIMEND, DATAEND */
  /*|  ja    >2 */
  /*|  mov   DATAEND, DELIMEND  // If DELIMEND >= PTR && DELIMEND < DATAEND */
  dasm_put(Dst, 337, Dt1(->end_ofs), Dt2(->limit), sizeof(upb_pbdecoder_frame), Dt1(->groupnum), Dt2(->end));
# 319 "upb/pb/compile_decoder_x64.dasc"
  /*|2: */
  /*|  ret */
  /*|3: */
  /*|  // Stack overflow error. */
  /*|  mov   PTR, DECODER->checkpoint  // Rollback to before the delim len. */
  /*|  // Prepare seterr args. */
  /*|  mov   ARG1_64, DECODER */
  /*|  ld64  kPbDecoderStackOverflow */
  dasm_put(Dst, 428, Dt2(->checkpoint));
   {
   uintptr_t v = (uintptr_t)kPbDecoderStackOverflow;
   if (v > 0xffffffff) {
  dasm_put(Dst, 446, (unsigned int)(v), (unsigned int)((v)>>32));
   } else if (v) {
  dasm_put(Dst, 451, v);
   } else {
  dasm_put(Dst, 454);
   }
   }
# 327 "upb/pb/compile_decoder_x64.dasc"
  /*|  callp upb_pbdecoder_seterr */
  /*|  call  ->suspend */
  /*|  jmp   <1 */
  /*|4: */
  /*|  // Overextended len. */
  /*|  mov   PTR, DECODER->checkpoint  // Rollback to before the delim len. */
  /*|  // Prepare seterr args. */
  /*|  mov   ARG1_64, DECODER */
  /*|  ld64  kPbDecoderSubmessageTooLong */
  dasm_put(Dst, 458, (unsigned int)((uintptr_t)upb_pbdecoder_seterr), (unsigned int)(((uintptr_t)upb_pbdecoder_seterr)>>32), 0xfffffffffffffff0UL, Dt2(->checkpoint));
   {
   uintptr_t v = (uintptr_t)kPbDecoderSubmessageTooLong;
   if (v > 0xffffffff) {
  dasm_put(Dst, 446, (unsigned int)(v), (unsigned int)((v)>>32));
   } else if (v) {
  dasm_put(Dst, 451, v);
   } else {
  dasm_put(Dst, 454);
   }
   }
# 336 "upb/pb/compile_decoder_x64.dasc"
  /*|  callp upb_pbdecoder_seterr */
  /*|  call  ->suspend */
  /*|  jmp   <1 */
  /*| */
  /*| // For getting a value that spans a buffer seam.  Falls back to C. */
  /*|.macro getvalue_slow, func, bytes */
  /*|  sub   rsp, 8           // Need stack space for func to write value to. */
  /*|1: */
  /*|  mov   qword [rsp], 0   // For parsing routines that only parse 32 bits. */
  /*|  mov   ARG1_64, DECODER */
  /*|  mov   ARG2_64, rsp */
  /*|  mov   DECODER->checkpoint, PTR */
  /*|  commit_regs */
  /*|  callp func */
  /*|  load_regs */
  /*|  test  eax, eax */
  /*|  jns   >2 */
  /*|  // Success; return parsed data (in rdx AND xmm0). */
  /*|  mov   rdx, [rsp] */
  /*|  movsd xmm0, qword [rsp] */
  /*|  add   rsp, 8 */
  /*|  sub   PTR, bytes       // Bias our buffer pointer to rejoin the fast-path. */
  /*|  mov   DECODER->ptr, PTR */
  /*|  ret */
  /*|2: */
  /*|  call  ->exitjit   // Return eax from decode function. */
  /*|  jmp   <1 */
  /*|.endmacro */
  /*| */
  dasm_put(Dst, 497, (unsigned int)((uintptr_t)upb_pbdecoder_seterr), (unsigned int)(((uintptr_t)upb_pbdecoder_seterr)>>32), 0xfffffffffffffff0UL);
# 365 "upb/pb/compile_decoder_x64.dasc"
  asmlabel(jc, "parse_unknown");
  /*| // Args: edx=fieldnum, cl=wire type */
  /*|->parse_unknown: */
  /*|  // OPT: handle directly instead of kicking to C. */
  /*|  // Check for ENDGROUP. */
  /*|  mov     ARG1_64, DECODER */
  /*|  mov     ARG2_32, edx */
  /*|  movzx   ARG3_32, cl */
  /*|  commit_regs */
  /*|  callp   upb_pbdecoder_skipunknown */
  /*|  load_regs */
  /*|  cmp     eax, DECODE_ENDGROUP */
  /*|  jne     >1 */
  dasm_put(Dst, 526, Dt2(->top), Dt2(->ptr), Dt2(->data_end), Dt2(->delim_end), Dt2(->buf), Dt2(->bufstart_ofs), Dt1(->end_ofs), Dt1(->sink.closure), (unsigned int)((uintptr_t)upb_pbdecoder_skipunknown), (unsigned int)(((uintptr_t)upb_pbdecoder_skipunknown)>>32), 0xfffffffffffffff0UL, Dt2(->top), Dt2(->ptr), Dt2(->data_end), Dt1(->sink.closure), Dt1(->end_ofs), Dt2(->bufstart_ofs), Dt2(->buf), DECODE_ENDGROUP);
# 378 "upb/pb/compile_decoder_x64.dasc"
  /*|  ret     // Return eax=DECODE_ENDGROUP, not zero */
  /*|1: */
  /*|  cmp     eax, DECODE_OK */
  /*|  je      >1 */
  /*|  call    ->exitjit  // Return eax from decode function. */
  /*|1: */
  /*|  xor     eax, eax */
  /*|  ret */
  /*| */
  /*| // Fallback functions for parsing single values.  These are used when the */
  /*| // buffer doesn't contain enough remaining data for the fast path.  Each */
  /*| // primitive type (v32, v64, f32, f64) has two functions: decode & skip. */
  /*| // Decode functions return their value in rsi/esi. */
  /*| // */
  /*| // These functions leave PTR = value_end - fast_path_bytes, so that we can */
  /*| // re-join the fast path which will add fast_path_bytes after the callback */
  /*| // completes.  We also set DECODER->ptr to this value which is a signal to */
  /*| // ->suspend that DECODER->checkpoint is up to date. */
  dasm_put(Dst, 623, DECODE_OK);
# 396 "upb/pb/compile_decoder_x64.dasc"
  asmlabel(jc, "skip_decode_f32_fallback");
  /*|->skipf32_fallback: */
  /*|->decodef32_fallback: */
  /*|  getvalue_slow upb_pbdecoder_decode_f32, 4 */
  dasm_put(Dst, 647, Dt2(->checkpoint), Dt2(->top), Dt2(->ptr), Dt2(->data_end), Dt2(->delim_end), Dt2(->buf), Dt2(->bufstart_ofs), Dt1(->end_ofs), Dt1(->sink.closure), (unsigned int)((uintptr_t)upb_pbdecoder_decode_f32), (unsigned int)(((uintptr_t)upb_pbdecoder_decode_f32)>>32), 0xfffffffffffffff0UL, Dt2(->top), Dt2(->ptr), Dt2(->data_end), Dt1(->sink.closure), Dt1(->end_ofs));
# 400 "upb/pb/compile_decoder_x64.dasc"
  /*| */
  dasm_put(Dst, 751, Dt2(->bufstart_ofs), Dt2(->buf), Dt2(->ptr));
# 401 "upb/pb/compile_decoder_x64.dasc"
  asmlabel(jc, "skip_decode_f64_fallback");
  /*|->skipf64_fallback: */
  /*|->decodef64_fallback: */
  /*|  getvalue_slow upb_pbdecoder_decode_f64, 8 */
  dasm_put(Dst, 799, Dt2(->checkpoint), Dt2(->top), Dt2(->ptr), Dt2(->data_end), Dt2(->delim_end), Dt2(->buf), Dt2(->bufstart_ofs), Dt1(->end_ofs), Dt1(->sink.closure), (unsigned int)((uintptr_t)upb_pbdecoder_decode_f64), (unsigned int)(((uintptr_t)upb_pbdecoder_decode_f64)>>32), 0xfffffffffffffff0UL, Dt2(->top), Dt2(->ptr), Dt2(->data_end), Dt1(->sink.closure), Dt1(->end_ofs));
# 405 "upb/pb/compile_decoder_x64.dasc"
  /*| */
  /*| // Called for varint >= 1 byte. */
  dasm_put(Dst, 903, Dt2(->bufstart_ofs), Dt2(->buf), Dt2(->ptr));
# 407 "upb/pb/compile_decoder_x64.dasc"
  asmlabel(jc, "skip_decode_v32_fallback");
  /*|->skipv32_fallback: */
  /*|->skipv64_fallback: */
  /*|  chkeob   16, >1 */
  dasm_put(Dst, 951);
   if (16 == 1) {
  dasm_put(Dst, 956);
   } else {
  dasm_put(Dst, 964);
   }
# 411 "upb/pb/compile_decoder_x64.dasc"
  /*|  // With at least 16 bytes left, we can do a branch-less SSE version. */
  /*|  movdqu   xmm0, [PTR] */
  /*|  pmovmskb eax, xmm0   // bits 0-15 are continuation bits, 16-31 are 0. */
  /*|  not      eax */
  /*|  bsf      eax, eax */
  /*|  cmp      al, 10 */
  /*|  jae      ->decode_varint_slow  // Error (>10 byte varint). */
  /*|  add      PTR, rax    // bsf result is 0-based, so PTR=end-1, as desired. */
  /*|  ret */
  /*| */
  /*|1: */
  /*|  // With fewer than 16 bytes, we have to read byte by byte. */
  /*|  lea      rcx, [PTR + 10] */
  /*|  mov      rax, PTR    // Preserve PTR in case of fallback to slow path. */
  /*|  cmp      rcx, DATAEND */
  /*|  cmova    rcx, DATAEND    // rcx = MIN(DATAEND, PTR + 10) */
  /*|2: */
  /*|  cmp      rax, rcx */
  /*|  je       ->decode_varint_slow */
  /*|  test     byte [rax], 0x80 */
  /*|  jz       >3 */
  /*|  add      rax, 1 */
  /*|  jmp      <2 */
  /*|3: */
  /*|  mov      PTR, rax  // PTR = varint_end - 1, as desired */
  /*|  ret */
  /*| */
  /*| // Returns tag in edx */
  dasm_put(Dst, 980, 10);
# 439 "upb/pb/compile_decoder_x64.dasc"
  asmlabel(jc, "decode_unknown_tag_fallback");
  /*|->decode_unknown_tag_fallback: */
  /*|  sub   rsp, 16 */
  /*|1: */
  /*|  cmp      PTR, DELIMEND */
  /*|  jne      >2 */
  /*|  add      rsp, 16 */
  /*|  xor      eax, eax */
  /*|  ret */
  /*|2: */
  /*|  // OPT: Have a medium-fast path before falling back to _slow. */
  /*|  mov   ARG1_64, DECODER */
  /*|  mov   ARG2_64, rsp */
  /*|  commit_regs */
  /*|  callp upb_pbdecoder_decode_varint_slow */
  /*|  load_regs */
  dasm_put(Dst, 1053, Dt2(->top), Dt2(->ptr), Dt2(->data_end), Dt2(->delim_end), Dt2(->buf), Dt2(->bufstart_ofs), Dt1(->end_ofs), Dt1(->sink.closure), (unsigned int)((uintptr_t)upb_pbdecoder_decode_varint_slow), (unsigned int)(((uintptr_t)upb_pbdecoder_decode_varint_slow)>>32), 0xfffffffffffffff0UL, Dt2(->top), Dt2(->ptr), Dt2(->data_end), Dt1(->sink.closure));
# 455 "upb/pb/compile_decoder_x64.dasc"
  /*|  cmp   eax, 0 */
  /*|  jge   >3 */
  /*|  mov   edx, [rsp]   // Success; return parsed data. */
  /*|  add   rsp, 16 */
  /*|  ret */
  /*|3: */
  /*|  call  ->exitjit   // Return eax from decode function. */
  /*|  jmp   <1 */
  /*| */
  /*| // Called for varint >= 1 byte. */
  dasm_put(Dst, 1156, Dt1(->end_ofs), Dt2(->bufstart_ofs), Dt2(->buf));
# 465 "upb/pb/compile_decoder_x64.dasc"
  asmlabel(jc, "decode_v32_v64_fallback");
  /*|->decodev32_fallback: */
  /*|->decodev64_fallback: */
  /*|  chkeob   10, ->decode_varint_slow */
  dasm_put(Dst, 1194);
   if (10 == 1) {
  dasm_put(Dst, 1199);
   } else {
  dasm_put(Dst, 1207);
   }
# 469 "upb/pb/compile_decoder_x64.dasc"
  /*|  // OPT: do something faster than just calling the C version. */
  /*|  mov      rdi, PTR */
  /*|  callp    upb_vdecode_fast */
  /*|  test     rax, rax */
  /*|  je       ->decode_varint_slow  // Unterminated varint. */
  /*|  mov      PTR, rax */
  /*|  sub      PTR, 1 */
  /*|  mov      DECODER->ptr, PTR */
  /*|  ret */
  /*| */
  dasm_put(Dst, 1223, (unsigned int)((uintptr_t)upb_vdecode_fast), (unsigned int)(((uintptr_t)upb_vdecode_fast)>>32), 0xfffffffffffffff0UL, Dt2(->ptr));
# 479 "upb/pb/compile_decoder_x64.dasc"
  asmlabel(jc, "decode_varint_slow");
  /*|->decode_varint_slow: */
  /*|  // Slow path: end of buffer or error (varint length >= 10). */
  /*|  getvalue_slow upb_pbdecoder_decode_varint_slow, 1 */
  dasm_put(Dst, 1268, Dt2(->checkpoint), Dt2(->top), Dt2(->ptr), Dt2(->data_end), Dt2(->delim_end), Dt2(->buf), Dt2(->bufstart_ofs), Dt1(->end_ofs), Dt1(->sink.closure), (unsigned int)((uintptr_t)upb_pbdecoder_decode_varint_slow), (unsigned int)(((uintptr_t)upb_pbdecoder_decode_varint_slow)>>32), 0xfffffffffffffff0UL, Dt2(->top), Dt2(->ptr), Dt2(->data_end), Dt1(->sink.closure), Dt1(->end_ofs), Dt2(->bufstart_ofs));
# 483 "upb/pb/compile_decoder_x64.dasc"
  /*| */
  /*| // Args: rsi=expected tag, return=rax (DECODE_{OK,MISMATCH}) */
  dasm_put(Dst, 1374, Dt2(->buf), Dt2(->ptr));
# 485 "upb/pb/compile_decoder_x64.dasc"
  asmlabel(jc, "checktag_fallback");
  /*|->checktag_fallback: */
  /*|  sub      rsp, 8 */
  /*|  mov      [rsp], rsi  // Preserve expected tag. */
  /*|1: */
  /*|  mov      ARG1_64, DECODER */
  /*|  commit_regs */
  /*|  mov      DECODER->checkpoint, PTR */
  /*|  callp    upb_pbdecoder_checktag_slow */
  /*|  load_regs */
  dasm_put(Dst, 1418, Dt2(->top), Dt2(->ptr), Dt2(->data_end), Dt2(->delim_end), Dt2(->buf), Dt2(->bufstart_ofs), Dt1(->end_ofs), Dt1(->sink.closure), Dt2(->checkpoint), (unsigned int)((uintptr_t)upb_pbdecoder_checktag_slow), (unsigned int)(((uintptr_t)upb_pbdecoder_checktag_slow)>>32), 0xfffffffffffffff0UL, Dt2(->top), Dt2(->ptr), Dt2(->data_end), Dt1(->sink.closure), Dt1(->end_ofs), Dt2(->bufstart_ofs));
# 495 "upb/pb/compile_decoder_x64.dasc"
  /*|  cmp      eax, 0 */
  /*|  jge      >2 */
  /*|  add      rsp, 8 */
  /*|  ret */
  /*|2: */
  /*|  call     ->exitjit */
  /*|  mov      rsi, [rsp] */
  /*|  cmp      PTR, DELIMEND */
  /*|  jne      <1 */
  /*|  mov      eax, DECODE_EOF */
  /*|  add      rsp, 8 */
  /*|  ret */
  /*| */
  /*| // Args: rsi=upb_inttable, rdx=key, return=rax (-1 if not found). */
  /*| // Preserves: rcx, rdx */
  /*| // OPT: Could write this in assembly if it's a hotspot. */
  dasm_put(Dst, 1517, Dt2(->buf), DECODE_EOF);
# 511 "upb/pb/compile_decoder_x64.dasc"
  asmlabel(jc, "hashlookup");
  /*|->hashlookup: */
  /*|  push   rcx */
  /*|  push   rdx */
  /*|  sub    rsp, 16 */
  /*|  mov    rdi, rsi */
  /*|  mov    rsi, rdx */
  /*|  mov    rdx, rsp */
  /*|  callp  upb_inttable_lookup */
  /*|  add    rsp, 16 */
  /*|  pop    rdx */
  /*|  pop    rcx */
  /*|  test   al, al */
  /*|  jz     >2  // Unknown field. */
  /*|  mov    rax, [rsp-32]  // Value from table. */
  /*|  ret */
  /*|2: */
  /*|  xor    rax, rax */
  /*|  not    rax */
  /*|  ret */
  dasm_put(Dst, 1559, (unsigned int)((uintptr_t)upb_inttable_lookup), (unsigned int)(((uintptr_t)upb_inttable_lookup)>>32), 0xfffffffffffffff0UL);
# 531 "upb/pb/compile_decoder_x64.dasc"
}

static void jitprimitive(jitcompiler *jc, opcode op,
                         const upb_handlers *h, upb_selector_t sel) {
  typedef enum { V32, V64, F32, F64, X } valtype_t;
  static valtype_t types[] = {
    X, F64, F32, V64, V64, V32, F64, F32, V64, X, X, X, X, V32, V32, F32, F64,
    V32, V64 };
  static char fastpath_bytes[] = { 1, 1, 4, 8 };
  const valtype_t vtype = types[op];
  const int fastbytes = fastpath_bytes[vtype];
  upb_func *handler = gethandler(h, sel);
  upb_fieldtype_t ftype;
  size_t offset;
  int32_t hasbit;

  if (handler) {
    /*|1: */
    /*|  chkneob  fastbytes, >3 */
    dasm_put(Dst, 112);
     if (fastbytes == 1) {
    dasm_put(Dst, 1628);
     } else {
    dasm_put(Dst, 1636, fastbytes);
     }
# 550 "upb/pb/compile_decoder_x64.dasc"
    /*|2: */
    dasm_put(Dst, 1652);
# 551 "upb/pb/compile_decoder_x64.dasc"
    switch (vtype) {
    case V32:
      /*|  call   ->decodev32_fallback */
      dasm_put(Dst, 1655);
# 554 "upb/pb/compile_decoder_x64.dasc"
      break;
    case V64:
      /*|  call   ->decodev64_fallback */
      dasm_put(Dst, 1659);
# 557 "upb/pb/compile_decoder_x64.dasc"
      break;
    case F32:
      /*|  call   ->decodef32_fallback */
      dasm_put(Dst, 1663);
# 560 "upb/pb/compile_decoder_x64.dasc"
      break;
    case F64:
      /*|  call   ->decodef64_fallback */
      dasm_put(Dst, 1667);
# 563 "upb/pb/compile_decoder_x64.dasc"
      break;
    case X: break;
    }
    /*|  jmp    >4 */
    dasm_put(Dst, 1671);
# 567 "upb/pb/compile_decoder_x64.dasc"

    /* Fast path decode; for when check_bytes bytes are available. */
    /*|3: */
    dasm_put(Dst, 1676);
# 570 "upb/pb/compile_decoder_x64.dasc"
    switch (op) {
    case OP_PARSE_SFIXED32:
    case OP_PARSE_FIXED32:
      /*|  mov    edx, dword [PTR] */
      dasm_put(Dst, 1679);
# 574 "upb/pb/compile_decoder_x64.dasc"
      break;
    case OP_PARSE_SFIXED64:
    case OP_PARSE_FIXED64:
      /*|  mov    rdx, qword [PTR] */
      dasm_put(Dst, 1682);
# 578 "upb/pb/compile_decoder_x64.dasc"
      break;
    case OP_PARSE_FLOAT:
      /*|  movss  xmm0, dword [PTR] */
      dasm_put(Dst, 1686);
# 581 "upb/pb/compile_decoder_x64.dasc"
      break;
    case OP_PARSE_DOUBLE:
      /*|  movsd  xmm0, qword [PTR] */
      dasm_put(Dst, 1692);
# 584 "upb/pb/compile_decoder_x64.dasc"
      break;
    default:
      /* Inline one byte of varint decoding. */
      /*|  movzx  edx, byte [PTR] */
      /*|  test   dl, dl */
      /*|  js     <2   // Fallback to slow path for >1 byte varint. */
      dasm_put(Dst, 1698);
# 590 "upb/pb/compile_decoder_x64.dasc"
      break;
    }

    /* Second-stage decode; used for both fast and slow paths */
    /* (only needed for a few types). */
    /*|4: */
    dasm_put(Dst, 1708);
# 596 "upb/pb/compile_decoder_x64.dasc"
    switch (op) {
    case OP_PARSE_SINT32:
      /* 32-bit zig-zag decode. */
      /*|  mov    eax, edx */
      /*|  shr    edx, 1 */
      /*|  and    eax, 1 */
      /*|  neg    eax */
      /*|  xor    edx, eax */
      dasm_put(Dst, 1711);
# 604 "upb/pb/compile_decoder_x64.dasc"
      break;
    case OP_PARSE_SINT64:
      /* 64-bit zig-zag decode. */
      /*|  mov    rax, rdx */
      /*|  shr    rdx, 1 */
      /*|  and    rax, 1 */
      /*|  neg    rax */
      /*|  xor    rdx, rax */
      dasm_put(Dst, 1725);
# 612 "upb/pb/compile_decoder_x64.dasc"
      break;
    case OP_PARSE_BOOL:
      /*|  test   rdx, rdx */
      /*|  setne  dl */
      dasm_put(Dst, 1744);
# 616 "upb/pb/compile_decoder_x64.dasc"
      break;
    default: break;
    }

    /* Call callback (or specialize if we can). */
    if (upb_msg_getscalarhandlerdata(h, sel, &ftype, &offset, &hasbit)) {
      switch (ftype) {
        case UPB_TYPE_INT64:
        case UPB_TYPE_UINT64:
          /*|  mov   [CLOSURE + offset], rdx */
          dasm_put(Dst, 1751, offset);
# 626 "upb/pb/compile_decoder_x64.dasc"
          break;
        case UPB_TYPE_INT32:
        case UPB_TYPE_UINT32:
        case UPB_TYPE_ENUM:
          /*|  mov   [CLOSURE + offset], edx */
          dasm_put(Dst, 1756, offset);
# 631 "upb/pb/compile_decoder_x64.dasc"
          break;
        case UPB_TYPE_DOUBLE:
          /*|  movsd  qword [CLOSURE + offset], XMMARG1 */
          dasm_put(Dst, 1761, offset);
# 634 "upb/pb/compile_decoder_x64.dasc"
          break;
        case UPB_TYPE_FLOAT:
          /*|  movss  dword [CLOSURE + offset], XMMARG1 */
          dasm_put(Dst, 1769, offset);
# 637 "upb/pb/compile_decoder_x64.dasc"
          break;
        case UPB_TYPE_BOOL:
          /*|  mov   [CLOSURE + offset], dl */
          dasm_put(Dst, 1777, offset);
# 640 "upb/pb/compile_decoder_x64.dasc"
          break;
        case UPB_TYPE_STRING:
        case UPB_TYPE_BYTES:
        case UPB_TYPE_MESSAGE:
          UPB_ASSERT(false); break;
      }
      /*|  sethas CLOSURE, hasbit */
       if (hasbit >= 0) {
      dasm_put(Dst, 1782, ((uint32_t)hasbit / 8), (1 << ((uint32_t)hasbit % 8)));
       }
# 647 "upb/pb/compile_decoder_x64.dasc"
    } else if (handler) {
      /*|  mov    ARG1_64, CLOSURE */
      /*|  load_handler_data h, sel */
      dasm_put(Dst, 1788);
       {
       uintptr_t v = (uintptr_t)upb_handlers_gethandlerdata(h, sel);
       if (v > 0xffffffff) {
      dasm_put(Dst, 446, (unsigned int)(v), (unsigned int)((v)>>32));
       } else if (v) {
      dasm_put(Dst, 451, v);
       } else {
      dasm_put(Dst, 454);
       }
       }
# 650 "upb/pb/compile_decoder_x64.dasc"
      /*|  callp  handler */
      dasm_put(Dst, 1793, (unsigned int)((uintptr_t)handler), (unsigned int)(((uintptr_t)handler)>>32), 0xfffffffffffffff0UL);
# 651 "upb/pb/compile_decoder_x64.dasc"
      if (!alwaysok(h, sel)) {
        /*|  test   al, al */
        /*|  jnz    >5 */
        /*|  call   ->suspend */
        /*|  jmp    <1 */
        /*|5: */
        dasm_put(Dst, 1815);
# 657 "upb/pb/compile_decoder_x64.dasc"
      }
    }

    /* We do this last so that the checkpoint is not advanced past the user's
     * data until the callback has returned success. */
    /*|  add    PTR, fastbytes */
    dasm_put(Dst, 1831, fastbytes);
# 663 "upb/pb/compile_decoder_x64.dasc"
  } else {
    /* No handler registered for this value, just skip it. */
    /*|  chkneob  fastbytes, >3 */
     if (fastbytes == 1) {
    dasm_put(Dst, 1628);
     } else {
    dasm_put(Dst, 1636, fastbytes);
     }
# 666 "upb/pb/compile_decoder_x64.dasc"
    /*|2: */
    dasm_put(Dst, 1652);
# 667 "upb/pb/compile_decoder_x64.dasc"
    switch (vtype) {
    case V32:
      /*|  call   ->skipv32_fallback */
      dasm_put(Dst, 1836);
# 670 "upb/pb/compile_decoder_x64.dasc"
      break;
    case V64:
      /*|  call   ->skipv64_fallback */
      dasm_put(Dst, 1840);
# 673 "upb/pb/compile_decoder_x64.dasc"
      break;
    case F32:
      /*|  call   ->skipf32_fallback */
      dasm_put(Dst, 1844);
# 676 "upb/pb/compile_decoder_x64.dasc"
      break;
    case F64:
      /*|  call   ->skipf64_fallback */
      dasm_put(Dst, 1848);
# 679 "upb/pb/compile_decoder_x64.dasc"
      break;
    case X: break;
    }

    /* Fast-path skip. */
    /*|3: */
    dasm_put(Dst, 1676);
# 685 "upb/pb/compile_decoder_x64.dasc"
    if (vtype == V32 || vtype == V64) {
      /*|  test   byte [PTR], 0x80 */
      /*|  jnz    <2 */
      dasm_put(Dst, 1852);
# 688 "upb/pb/compile_decoder_x64.dasc"
    }
    /*|  add    PTR, fastbytes */
    dasm_put(Dst, 1831, fastbytes);
# 690 "upb/pb/compile_decoder_x64.dasc"
  }
}

static void jitdispatch(jitcompiler *jc,
                        const upb_pbdecodermethod *method) {
  /* Lots of room for tweaking/optimization here. */

  const upb_inttable *dispatch = &method->dispatch;
  bool has_hash_entries = (dispatch->t.count > 0);

  /* Whether any of the fields for this message can have two wire types which
   * are both valid (packed & non-packed).
   *
   * OPT: populate this more precisely; not all messages with hash entries have
   * this characteristic. */
  bool has_multi_wiretype = has_hash_entries;

  /*|=>define_jmptarget(jc, &method->dispatch): */
  /*|1: */
  dasm_put(Dst, 1861, define_jmptarget(jc, &method->dispatch));
# 709 "upb/pb/compile_decoder_x64.dasc"
  /* Decode the field tag. */
  /*|  mov     aword DECODER->checkpoint, PTR */
  /*|  chkeob  2, >6 */
  dasm_put(Dst, 308, Dt2(->checkpoint));
   if (2 == 1) {
  dasm_put(Dst, 1865);
   } else {
  dasm_put(Dst, 1873);
   }
# 712 "upb/pb/compile_decoder_x64.dasc"
  /*|  movzx   edx, byte [PTR] */
  /*|  test    dl, dl */
  /*|  jns     >7    // Jump if first byte has no continuation bit. */
  /*|  movzx   ecx, byte [PTR + 1] */
  /*|  test    cl, cl */
  /*|  js      >6    // Jump if second byte has continuation bit. */
  /*|  // Confirmed two-byte varint. */
  /*|  shl     ecx, 7 */
  /*|  and     edx, 0x7f */
  /*|  or      edx, ecx */
  /*|  add     PTR, 2 */
  /*|  jmp     >8 */
  /*|6: */
  /*|  call    ->decode_unknown_tag_fallback */
  /*|  test    eax, eax  // Hit DELIMEND? */
  /*|  jnz     >8 */
  /*|  ret */
  /*|7: */
  /*|  add     PTR, 1 */
  /*|8: */
  /*|  mov     ecx, edx */
  /*|  shr     edx, 3 */
  /*|  and     cl, 7 */
  dasm_put(Dst, 1889, 1);
# 735 "upb/pb/compile_decoder_x64.dasc"

  /* See comment attached to upb_pbdecodermethod.dispatch for layout of the
   * dispatch table. */
  /*|2: */
  /*|  cmp     edx, dispatch->array_size */
  dasm_put(Dst, 1954, dispatch->array_size);
# 740 "upb/pb/compile_decoder_x64.dasc"
  if (has_hash_entries) {
    /*|  jae     >7 */
    dasm_put(Dst, 1961);
# 742 "upb/pb/compile_decoder_x64.dasc"
  } else {
    /*|  jae     >5 */
    dasm_put(Dst, 1966);
# 744 "upb/pb/compile_decoder_x64.dasc"
  }
  /*|  // OPT: Compact the lookup arr into 32-bit entries. */
  if ((uintptr_t)dispatch->array > 0x7fffffff) {
    /*|  mov64 rax, (uintptr_t)dispatch->array */
    /*|  mov   rax, qword [rax + rdx * 8] */
    dasm_put(Dst, 1971, (unsigned int)((uintptr_t)dispatch->array), (unsigned int)(((uintptr_t)dispatch->array)>>32));
# 749 "upb/pb/compile_decoder_x64.dasc"
  } else {
    /*|  mov   rax, qword [rdx * 8 + dispatch->array] */
    dasm_put(Dst, 1980, dispatch->array);
# 751 "upb/pb/compile_decoder_x64.dasc"
  }
  /*|3: */
  /*|  // We take advantage of the fact that non-present entries are stored */
  /*|  // as -1, which will result in wire types that will never match. */
  /*|  cmp  al, cl */
  dasm_put(Dst, 1986);
# 756 "upb/pb/compile_decoder_x64.dasc"
  if (has_multi_wiretype) {
    /*|  jne  >6 */
    dasm_put(Dst, 1991);
# 758 "upb/pb/compile_decoder_x64.dasc"
  } else {
    /*|  jne  >5 */
    dasm_put(Dst, 1996);
# 760 "upb/pb/compile_decoder_x64.dasc"
  }
  /*|  shr  rax, 16 */
  /*| */
  /*|  // Load the machine code address from the table entry. */
  /*|  // The table entry is relative to the dispatch->array jmptarget */
  /*|  // (patchdispatch() took care of this) which is the same as */
  /*|  // local label "4".  The "lea" is really just trying to do */
  /*|  //    lea  rax, [>4 + rax] */
  /*|  // */
  /*|  // But we can't write that directly for some reason, so we use */
  /*|  // rdx as a temporary. */
  /*|  lea  rdx, [>4] */
  /*|=>define_jmptarget(jc, dispatch->array): */
  /*|4: */
  /*|  add  rax, rdx */
  /*|  ret */
  /*| */
  /*|5: */
  /*|  // Field isn't in our table. */
  /*| */
  /*|  // For pushing unknown fields to the unknown field handler. */
  /*|  mov64 rax, (uintptr_t)method->dest_handlers_ */
  /*|  mov FRAME->sink.handlers, rax */
  /*| */
  /*|  call ->parse_unknown */
  /*|  test eax, eax  // ENDGROUP? */
  /*|  jz   <1 */
  /*|  lea  rax, [>9]  // ENDGROUP; Load address of OP_ENDMSG. */
  /*|  ret */
  dasm_put(Dst, 2001, define_jmptarget(jc, dispatch->array), (unsigned int)((uintptr_t)method->dest_handlers_), (unsigned int)(((uintptr_t)method->dest_handlers_)>>32), Dt1(->sink.handlers));
# 789 "upb/pb/compile_decoder_x64.dasc"

  if (has_multi_wiretype) {
    /*|6: */
    /*|  // Primary wire type didn't match, check secondary wire type. */
    /*|  cmp  ah, cl */
    /*|  jne  <5 */
    /*|  // Secondary wire type is a match, look up fn + UPB_MAX_FIELDNUMBER. */
    /*|  add   rdx, UPB_MAX_FIELDNUMBER */
    /*|  // This key will never be in the array part, so do a hash lookup. */
    dasm_put(Dst, 2043, UPB_MAX_FIELDNUMBER);
# 798 "upb/pb/compile_decoder_x64.dasc"
    UPB_ASSERT(has_hash_entries);
    /*|  ld64  dispatch */
     {
     uintptr_t v = (uintptr_t)dispatch;
     if (v > 0xffffffff) {
    dasm_put(Dst, 446, (unsigned int)(v), (unsigned int)((v)>>32));
     } else if (v) {
    dasm_put(Dst, 451, v);
     } else {
    dasm_put(Dst, 454);
     }
     }
# 800 "upb/pb/compile_decoder_x64.dasc"
    /*|  jmp   ->hashlookup  // Tail call. */
    dasm_put(Dst, 2056);
# 801 "upb/pb/compile_decoder_x64.dasc"
  }

  if (has_hash_entries) {
    /*|7: */
    /*|  // Hash table lookup. */
    /*|  ld64   dispatch */
    dasm_put(Dst, 2061);
     {
     uintptr_t v = (uintptr_t)dispatch;
     if (v > 0xffffffff) {
    dasm_put(Dst, 446, (unsigned int)(v), (unsigned int)((v)>>32));
     } else if (v) {
    dasm_put(Dst, 451, v);
     } else {
    dasm_put(Dst, 454);
     }
     }
# 807 "upb/pb/compile_decoder_x64.dasc"
    /*|  call   ->hashlookup */
    /*|  jmp    <3 */
    dasm_put(Dst, 2064);
# 809 "upb/pb/compile_decoder_x64.dasc"
  }
}

static void jittag(jitcompiler *jc, uint64_t tag, int n, int ofs,
                   const upb_pbdecodermethod *method) {
  /* Internally we parse unknown fields; if this runs us into DELIMEND we jump
   * to the corresponding DELIMEND target (either msg end or repeated field
   * end), which we find from the OP_CHECKDELIM which must have necessarily
   * preceded us. */
  uint32_t last_instruction = *(jc->pc - 2);
  int last_arg = (int32_t)last_instruction >> 8;
  uint32_t *delimend = (jc->pc - 1) + last_arg;
  const size_t ptr_words = sizeof(void*) / sizeof(uint32_t);

  UPB_ASSERT((last_instruction & 0xff) == OP_CHECKDELIM);

  if (getop(*(jc->pc - 1)) == OP_TAGN) {
    jc->pc += ptr_words;
  }

  /*|  chkneob n, >1 */
   if (n == 1) {
  dasm_put(Dst, 2072);
   } else {
  dasm_put(Dst, 2080, n);
   }
# 830 "upb/pb/compile_decoder_x64.dasc"

  /*|  // OPT: this is way too much fallback code to put here. */
  /*|  // Reduce and/or move to a separate section to make better icache usage. */
  /*|  ld64  tag */
   {
   uintptr_t v = (uintptr_t)tag;
   if (v > 0xffffffff) {
  dasm_put(Dst, 446, (unsigned int)(v), (unsigned int)((v)>>32));
   } else if (v) {
  dasm_put(Dst, 451, v);
   } else {
  dasm_put(Dst, 454);
   }
   }
# 834 "upb/pb/compile_decoder_x64.dasc"
  /*|  call  ->checktag_fallback */
  /*|  cmp   eax, DECODE_MISMATCH */
  /*|  je    >3 */
  /*|  cmp   eax, DECODE_EOF */
  /*|  je     =>jmptarget(jc, delimend) */
  /*|  jmp   >5 */
  dasm_put(Dst, 2096, DECODE_MISMATCH, DECODE_EOF, jmptarget(jc, delimend));
# 840 "upb/pb/compile_decoder_x64.dasc"

  /*|1: */
  dasm_put(Dst, 112);
# 842 "upb/pb/compile_decoder_x64.dasc"
  switch (n) {
  case 1:
    /*|  cmp  byte [PTR], tag */
    dasm_put(Dst, 2119, tag);
# 845 "upb/pb/compile_decoder_x64.dasc"
    break;
  case 2:
    /*|  cmp  word [PTR], tag */
    dasm_put(Dst, 2123, tag);
# 848 "upb/pb/compile_decoder_x64.dasc"
    break;
  case 3:
    /*|   // OPT: Slightly more efficient code, but depends on an extra byte. */
    /*|   // mov  eax, dword [PTR] */
    /*|   // shl  eax, 8 */
    /*|   // cmp  eax, tag << 8 */
    /*|   cmp  word [PTR], (tag & 0xffff) */
    /*|   jne  >2 */
    /*|   cmp  byte [PTR + 2], (tag >> 16) */
    /*|2: */
    dasm_put(Dst, 2128, (tag & 0xffff), 2, (tag >> 16));
# 858 "upb/pb/compile_decoder_x64.dasc"
    break;
  case 4:
    /*|   cmp  dword [PTR], tag */
    dasm_put(Dst, 2143, tag);
# 861 "upb/pb/compile_decoder_x64.dasc"
    break;
  case 5:
    /*|   cmp  dword [PTR], (tag & 0xffffffff) */
    /*|   jne  >3 */
    /*|   cmp  byte  [PTR + 4], (tag >> 32) */
    dasm_put(Dst, 2147, (tag & 0xffffffff), 4, (tag >> 32));
# 866 "upb/pb/compile_decoder_x64.dasc"
  }
  /*|  je    >4 */
  /*|3: */
  dasm_put(Dst, 2159);
# 869 "upb/pb/compile_decoder_x64.dasc"
  if (ofs == 0) {
    /*|  call   =>jmptarget(jc, &method->dispatch) */
    /*|  test   rax, rax */
    /*|  jz     =>jmptarget(jc, delimend) */
    /*|  jmp    rax */
    dasm_put(Dst, 2166, jmptarget(jc, &method->dispatch), jmptarget(jc, delimend));
# 874 "upb/pb/compile_decoder_x64.dasc"
  } else {
    /*|  jmp    =>jmptarget(jc, jc->pc + ofs) */
    dasm_put(Dst, 2178, jmptarget(jc, jc->pc + ofs));
# 876 "upb/pb/compile_decoder_x64.dasc"
  }
  /*|4: */
  /*|  add    PTR, n */
  /*|5: */
  dasm_put(Dst, 2182, n);
# 880 "upb/pb/compile_decoder_x64.dasc"
}

/* Compile the bytecode to x64. */
static void jitbytecode(jitcompiler *jc) {
  upb_pbdecodermethod *method = NULL;
  const upb_handlers *h = NULL;
  for (jc->pc = jc->group->bytecode; jc->pc < jc->group->bytecode_end; ) {
    int32_t instr = *jc->pc;
    opcode op = instr & 0xff;
    uint32_t arg = instr >> 8;
    int32_t longofs = arg;

    if (op != OP_SETDISPATCH) {
      /* Skipped for SETDISPATCH because it defines its own asmlabel for the
       * dispatch code it emits. */
      asmlabel(jc, "0x%lx.%s", pcofs(jc), upb_pbdecoder_getopname(op));

      /* Skipped for SETDISPATCH because it should point at the function
       * prologue, not the dispatch function that is emitted first.
       * TODO: optimize this to only define pclabels that are actually used. */
      /*|=>define_jmptarget(jc, jc->pc): */
      dasm_put(Dst, 0, define_jmptarget(jc, jc->pc));
# 901 "upb/pb/compile_decoder_x64.dasc"
    }

    jc->pc++;

    switch (op) {
    case OP_STARTMSG: {
      upb_func *startmsg = gethandler(h, UPB_STARTMSG_SELECTOR);
      if (startmsg) {
        /* bool startmsg(void *closure, const void *hd) */
        /*|1: */
        /*|  mov   ARG1_64, CLOSURE */
        /*|  load_handler_data h, UPB_STARTMSG_SELECTOR */
        dasm_put(Dst, 2191);
         {
         uintptr_t v = (uintptr_t)upb_handlers_gethandlerdata(h, UPB_STARTMSG_SELECTOR);
         if (v > 0xffffffff) {
        dasm_put(Dst, 446, (unsigned int)(v), (unsigned int)((v)>>32));
         } else if (v) {
        dasm_put(Dst, 451, v);
         } else {
        dasm_put(Dst, 454);
         }
         }
# 913 "upb/pb/compile_decoder_x64.dasc"
        /*|  callp startmsg */
        dasm_put(Dst, 1793, (unsigned int)((uintptr_t)startmsg), (unsigned int)(((uintptr_t)startmsg)>>32), 0xfffffffffffffff0UL);
# 914 "upb/pb/compile_decoder_x64.dasc"
        if (!alwaysok(h, UPB_STARTMSG_SELECTOR)) {
          /*|  test  al, al */
          /*|  jnz   >2 */
          /*|  call  ->suspend */
          /*|  jmp   <1 */
          /*|2: */
          dasm_put(Dst, 2198);
# 920 "upb/pb/compile_decoder_x64.dasc"
        }
      } else {
        /*| nop */
        dasm_put(Dst, 2214);
# 923 "upb/pb/compile_decoder_x64.dasc"
      }
      break;
    }
    case OP_ENDMSG: {
      upb_func *endmsg = gethandler(h, UPB_ENDMSG_SELECTOR);
      /*|9: */
      dasm_put(Dst, 2216);
# 929 "upb/pb/compile_decoder_x64.dasc"
      if (endmsg) {
        /* bool endmsg(void *closure, const void *hd, upb_status *status) */
        /*|  mov   ARG1_64, CLOSURE */
        /*|  load_handler_data h, UPB_ENDMSG_SELECTOR */
        dasm_put(Dst, 1788);
         {
         uintptr_t v = (uintptr_t)upb_handlers_gethandlerdata(h, UPB_ENDMSG_SELECTOR);
         if (v > 0xffffffff) {
        dasm_put(Dst, 446, (unsigned int)(v), (unsigned int)((v)>>32));
         } else if (v) {
        dasm_put(Dst, 451, v);
         } else {
        dasm_put(Dst, 454);
         }
         }
# 933 "upb/pb/compile_decoder_x64.dasc"
        /*|  mov   ARG3_64, DECODER->status */
        /*|  callp endmsg */
        dasm_put(Dst, 2219, Dt2(->status), (unsigned int)((uintptr_t)endmsg), (unsigned int)(((uintptr_t)endmsg)>>32), 0xfffffffffffffff0UL);
# 935 "upb/pb/compile_decoder_x64.dasc"
      }
      break;
    }
    case OP_SETDISPATCH: {
      uint32_t *op_pc = jc->pc - 1;
      const char *msgname;
      upb_inttable *dispatch;

      /* Load info for new method. */
      memcpy(&dispatch, jc->pc, sizeof(void*));
      jc->pc += sizeof(void*) / sizeof(uint32_t);
      /* The OP_SETDISPATCH bytecode contains a pointer that is
       * &method->dispatch; we want to go backwards and recover method. */
      method =
          (void*)((char*)dispatch - offsetof(upb_pbdecodermethod, dispatch));
      /* May be NULL, in which case no handlers for this message will be found.
       * OPT: we should do better by completely skipping the message in this
       * case instead of parsing it field by field.  We should also do the skip
       * in the containing message's code. */
      h = method->dest_handlers_;
      msgname = upb_msgdef_fullname(upb_handlers_msgdef(h));

      /* Emit dispatch code for new method. */
      asmlabel(jc, "0x%lx.dispatch.%s", pcofs(jc), msgname);
      jitdispatch(jc, method);

      /* Emit function prologue for new method. */
      asmlabel(jc, "0x%lx.parse.%s", pcofs(jc), msgname);
      /*|=>define_jmptarget(jc, op_pc): */
      /*|=>define_jmptarget(jc, method): */
      /*|  sub   rsp, 8 */
      dasm_put(Dst, 2245, define_jmptarget(jc, op_pc), define_jmptarget(jc, method));
# 966 "upb/pb/compile_decoder_x64.dasc"

      break;
    }
    case OP_PARSE_DOUBLE:
    case OP_PARSE_FLOAT:
    case OP_PARSE_INT64:
    case OP_PARSE_UINT64:
    case OP_PARSE_INT32:
    case OP_PARSE_FIXED64:
    case OP_PARSE_FIXED32:
    case OP_PARSE_BOOL:
    case OP_PARSE_UINT32:
    case OP_PARSE_SFIXED32:
    case OP_PARSE_SFIXED64:
    case OP_PARSE_SINT32:
    case OP_PARSE_SINT64:
      jitprimitive(jc, op, h, arg);
      break;
    case OP_STARTSEQ:
    case OP_STARTSUBMSG:
    case OP_STARTSTR: {
      upb_func *start = gethandler(h, arg);
      if (start) {
        /* void *startseq(void *closure, const void *hd)
         * void *startsubmsg(void *closure, const void *hd)
         * void *startstr(void *closure, const void *hd, size_t size_hint) */
        /*|1: */
        /*|  mov   ARG1_64, CLOSURE */
        /*|  load_handler_data h, arg */
        dasm_put(Dst, 2191);
         {
         uintptr_t v = (uintptr_t)upb_handlers_gethandlerdata(h, arg);
         if (v > 0xffffffff) {
        dasm_put(Dst, 446, (unsigned int)(v), (unsigned int)((v)>>32));
         } else if (v) {
        dasm_put(Dst, 451, v);
         } else {
        dasm_put(Dst, 454);
         }
         }
# 995 "upb/pb/compile_decoder_x64.dasc"
        if (op == OP_STARTSTR) {
          /*|  mov    ARG3_64, DELIMEND */
          /*|  sub    ARG3_64, PTR */
          dasm_put(Dst, 2253);
# 998 "upb/pb/compile_decoder_x64.dasc"
        }
        /*|  callp start */
        dasm_put(Dst, 1793, (unsigned int)((uintptr_t)start), (unsigned int)(((uintptr_t)start)>>32), 0xfffffffffffffff0UL);
# 1000 "upb/pb/compile_decoder_x64.dasc"
        if (!alwaysok(h, arg)) {
          /*|  test  rax, rax */
          /*|  jnz   >2 */
          /*|  call  ->suspend */
          /*|  jmp   <1 */
          /*|2: */
          dasm_put(Dst, 2261);
# 1006 "upb/pb/compile_decoder_x64.dasc"
        }
        /*|  mov   CLOSURE, rax */
        dasm_put(Dst, 2278);
# 1008 "upb/pb/compile_decoder_x64.dasc"
      } else {
        /* TODO: nop is only required because of asmlabel(). */
        /*|  nop */
        dasm_put(Dst, 2214);
# 1011 "upb/pb/compile_decoder_x64.dasc"
      }
      break;
    }
    case OP_ENDSEQ:
    case OP_ENDSUBMSG:
    case OP_ENDSTR: {
      upb_func *end = gethandler(h, arg);
      if (end) {
        /* bool endseq(void *closure, const void *hd)
         * bool endsubmsg(void *closure, const void *hd)
         * bool endstr(void *closure, const void *hd) */
        /*|1: */
        /*|  mov   ARG1_64, CLOSURE */
        /*|  load_handler_data h, arg */
        dasm_put(Dst, 2191);
         {
         uintptr_t v = (uintptr_t)upb_handlers_gethandlerdata(h, arg);
         if (v > 0xffffffff) {
        dasm_put(Dst, 446, (unsigned int)(v), (unsigned int)((v)>>32));
         } else if (v) {
        dasm_put(Dst, 451, v);
         } else {
        dasm_put(Dst, 454);
         }
         }
# 1025 "upb/pb/compile_decoder_x64.dasc"
        /*|  callp end */
        dasm_put(Dst, 1793, (unsigned int)((uintptr_t)end), (unsigned int)(((uintptr_t)end)>>32), 0xfffffffffffffff0UL);
# 1026 "upb/pb/compile_decoder_x64.dasc"
        if (!alwaysok(h, arg)) {
          /*|  test  al, al */
          /*|  jnz   >2 */
          /*|  call  ->suspend */
          /*|  jmp   <1 */
          /*|2: */
          dasm_put(Dst, 2198);
# 1032 "upb/pb/compile_decoder_x64.dasc"
        }
      } else {
        /* TODO: nop is only required because of asmlabel(). */
        /*|  nop */
        dasm_put(Dst, 2214);
# 1036 "upb/pb/compile_decoder_x64.dasc"
      }
      break;
    }
    case OP_STRING: {
      upb_func *str = gethandler(h, arg);
      /*|  cmp   PTR, DELIMEND */
      /*|  je    >4 */
      /*|1: */
      /*|  cmp   PTR, DATAEND */
      /*|  jne   >2 */
      /*|  call  ->suspend */
      /*|  jmp   <1 */
      /*|2: */
      dasm_put(Dst, 2282);
# 1049 "upb/pb/compile_decoder_x64.dasc"
      if (str) {
        /* size_t str(void *closure, const void *hd, const char *str,
         *            size_t n) */
        /*|  mov   ARG1_64, CLOSURE */
        /*|  load_handler_data h, arg */
        dasm_put(Dst, 1788);
         {
         uintptr_t v = (uintptr_t)upb_handlers_gethandlerdata(h, arg);
         if (v > 0xffffffff) {
        dasm_put(Dst, 446, (unsigned int)(v), (unsigned int)((v)>>32));
         } else if (v) {
        dasm_put(Dst, 451, v);
         } else {
        dasm_put(Dst, 454);
         }
         }
# 1054 "upb/pb/compile_decoder_x64.dasc"
        /*|  mov   ARG3_64, PTR */
        /*|  mov   ARG4_64, DATAEND */
        /*|  sub   ARG4_64, PTR */
        /*|  mov   ARG5_64, qword DECODER->handle */
        /*|  callp str */
        /*|  add   PTR, rax */
        dasm_put(Dst, 2309, Dt2(->handle), (unsigned int)((uintptr_t)str), (unsigned int)(((uintptr_t)str)>>32), 0xfffffffffffffff0UL);
# 1060 "upb/pb/compile_decoder_x64.dasc"
        if (!alwaysok(h, arg)) {
          /*|  cmp   PTR, DATAEND */
          /*|  je    >3 */
          /*|  call  ->strret_fallback */
          /*|3: */
          dasm_put(Dst, 2347);
# 1065 "upb/pb/compile_decoder_x64.dasc"
        }
      } else {
        /*|  mov   PTR, DATAEND */
        dasm_put(Dst, 2360);
# 1068 "upb/pb/compile_decoder_x64.dasc"
      }
      /*|  cmp   PTR, DELIMEND */
      /*|  jne   <1 */
      /*|4: */
      dasm_put(Dst, 2364);
# 1072 "upb/pb/compile_decoder_x64.dasc"
      break;
    }
    case OP_PUSHTAGDELIM:
      /*|  mov   FRAME->sink.closure, CLOSURE */
      /*|  // This shouldn't need to be read, because tag-delimited fields */
      /*|  // shouldn't have an OP_SETDELIM after them.  But for the moment */
      /*|  // non-packed repeated fields do OP_SETDELIM so they can share more */
      /*|  // code with the packed code-path.  If this is changed later, this */
      /*|  // store can be removed. */
      /*|  mov   qword FRAME->end_ofs, 0 */
      /*|  cmp   FRAME, DECODER->limit */
      /*|  je    ->err */
      /*|  add   FRAME, sizeof(upb_pbdecoder_frame) */
      /*|  mov   dword FRAME->groupnum, arg */
      dasm_put(Dst, 2375, Dt1(->sink.closure), Dt1(->end_ofs), Dt2(->limit), sizeof(upb_pbdecoder_frame), Dt1(->groupnum), arg);
# 1086 "upb/pb/compile_decoder_x64.dasc"
      break;
    case OP_PUSHLENDELIM:
      /*|  call  ->pushlendelim */
      dasm_put(Dst, 2405);
# 1089 "upb/pb/compile_decoder_x64.dasc"
      break;
    case OP_POP:
      /*|  sub   FRAME, sizeof(upb_pbdecoder_frame) */
      /*|  mov   CLOSURE, FRAME->sink.closure */
      dasm_put(Dst, 2409, sizeof(upb_pbdecoder_frame), Dt1(->sink.closure));
# 1093 "upb/pb/compile_decoder_x64.dasc"
      break;
    case OP_SETDELIM:
      /* OPT: experiment with testing vs old offset to optimize away. */
      /*|  mov   DATAEND, DECODER->end */
      /*|  add   DELIMEND, FRAME->end_ofs */
      /*|  cmp   DELIMEND, DECODER->buf */
      /*|  jb    >1 */
      /*|  cmp   DELIMEND, DATAEND */
      /*|  ja    >1   // OPT: try cmov. */
      /*|  mov   DATAEND, DELIMEND */
      /*|1: */
      dasm_put(Dst, 2419, Dt2(->end), Dt1(->end_ofs), Dt2(->buf));
# 1104 "upb/pb/compile_decoder_x64.dasc"
      break;
    case OP_SETBIGGROUPNUM:
      /*|  mov   dword FRAME->groupnum, *jc->pc++ */
      dasm_put(Dst, 2399, Dt1(->groupnum), *jc->pc++);
# 1107 "upb/pb/compile_decoder_x64.dasc"
      break;
    case OP_CHECKDELIM:
      /*|  cmp  DELIMEND, PTR */
      /*|  je   =>jmptarget(jc, jc->pc + longofs) */
      dasm_put(Dst, 2449, jmptarget(jc, jc->pc + longofs));
# 1111 "upb/pb/compile_decoder_x64.dasc"
      break;
    case OP_CALL:
      /*|  call =>jmptarget(jc, jc->pc + longofs) */
      dasm_put(Dst, 2456, jmptarget(jc, jc->pc + longofs));
# 1114 "upb/pb/compile_decoder_x64.dasc"
      break;
    case OP_BRANCH:
      /*|  jmp  =>jmptarget(jc, jc->pc + longofs); */
      dasm_put(Dst, 2178, jmptarget(jc, jc->pc + longofs));
# 1117 "upb/pb/compile_decoder_x64.dasc"
      break;
    case OP_RET:
      /*|9: */
      /*|  add  rsp, 8 */
      /*|  ret */
      dasm_put(Dst, 2459);
# 1122 "upb/pb/compile_decoder_x64.dasc"
      break;
    case OP_TAG1:
      jittag(jc, (arg >> 8) & 0xff, 1, (int8_t)arg, method);
      break;
    case OP_TAG2:
      jittag(jc, (arg >> 8) & 0xffff, 2, (int8_t)arg, method);
      break;
    case OP_TAGN: {
      uint64_t tag;
      memcpy(&tag, jc->pc, 8);
      jittag(jc, tag, arg >> 8, (int8_t)arg, method);
      break;
    }
    case OP_DISPATCH:
      /*|  call   =>jmptarget(jc, &method->dispatch) */
      dasm_put(Dst, 2456, jmptarget(jc, &method->dispatch));
# 1137 "upb/pb/compile_decoder_x64.dasc"
      break;
    case OP_HALT:
      UPB_ASSERT(false);
    }
  }

  asmlabel(jc, "eof");
  /*|  nop */
  dasm_put(Dst, 2214);
# 1145 "upb/pb/compile_decoder_x64.dasc"
}