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diff --git a/upb/pb/decoder.h b/upb/pb/decoder.h
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+/*
+ * upb - a minimalist implementation of protocol buffers.
+ *
+ * Copyright (c) 2009-2010 Google Inc.  See LICENSE for details.
+ * Author: Josh Haberman <jhaberman@gmail.com>
+ *
+ * upb_decoder implements a high performance, streaming decoder for protobuf
+ * data that works by implementing upb_src and getting its data from a
+ * upb_bytesrc.
+ *
+ * The decoder does not currently support non-blocking I/O, in the sense that
+ * if the bytesrc returns UPB_STATUS_TRYAGAIN it is not possible to resume the
+ * decoder when data becomes available again.  Support for this could be added,
+ * but it would add complexity and perhaps cost efficiency also.
+ */
+
+#ifndef UPB_DECODER_H_
+#define UPB_DECODER_H_
+
+#include <setjmp.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include "upb/handlers.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* upb_decoder *****************************************************************/
+
+struct dasm_State;
+
+typedef struct _upb_decoder {
+  upb_bytesrc *bytesrc;       // Source of our serialized data.
+  upb_dispatcher dispatcher;  // Dispatcher to which we push parsed data.
+  upb_status *status;         // Where we will store any errors that occur.
+  upb_strref strref;          // For passing string data to callbacks.
+
+  // Offsets for the region we currently have ref'd.
+  uint64_t refstart_ofs, refend_ofs;
+
+  // Current buffer and its stream offset.
+  const char *buf, *ptr, *end;
+  uint64_t bufstart_ofs, bufend_ofs;
+
+  // Stream offset for the end of the top-level message, if any.
+  uint64_t end_ofs;
+
+  // Buf offset as of which we've delivered calbacks; needed for rollback on
+  // UPB_TRYAGAIN (or in the future, UPB_SUSPEND).
+  const char *completed_ptr;
+
+  // End of the delimited region, relative to ptr, or UINTPTR_MAX if not in
+  // this buf.
+  uintptr_t delim_end;
+
+#ifdef UPB_USE_JIT_X64
+  // For JIT, which doesn't do bounds checks in the middle of parsing a field.
+  const char *jit_end, *effective_end;  // == MIN(jit_end, submsg_end)
+
+  // JIT-generated machine code (else NULL).
+  char *jit_code;
+  size_t jit_size;
+  char *debug_info;
+
+  struct dasm_State *dynasm;
+#endif
+
+  sigjmp_buf exitjmp;
+} upb_decoder;
+
+// Initializes/uninitializes a decoder for calling into the given handlers
+// or to write into the given msgdef, given its accessors).  Takes a ref
+// on the handlers or msgdef.
+void upb_decoder_initforhandlers(upb_decoder *d, upb_handlers *h);
+
+// Equivalent to:
+//   upb_accessors_reghandlers(m, h);
+//   upb_decoder_initforhandlers(d, h);
+// except possibly more efficient, by using cached state in the msgdef.
+void upb_decoder_initformsgdef(upb_decoder *d, upb_msgdef *m);
+void upb_decoder_uninit(upb_decoder *d);
+
+// Resets the internal state of an already-allocated decoder.  This puts it in a
+// state where it has not seen any data, and expects the next data to be from
+// the beginning of a new protobuf.  Parsers must be reset before they can be
+// used.  A decoder can be reset multiple times.
+//
+// Pass UINT64_MAX for end_ofs to indicate a non-delimited top-level message.
+void upb_decoder_reset(upb_decoder *d, upb_bytesrc *src, uint64_t start_ofs,
+                       uint64_t end_ofs, void *closure);
+
+void upb_decoder_decode(upb_decoder *d, upb_status *status);
+
+#ifdef __cplusplus
+}  /* extern "C" */
+#endif
+
+#endif  /* UPB_DECODER_H_ */