Update //third_party/protobuf to version 3.

third_party/protobuf/ruby/ext/google/protobuf_c/protobuf.h

+// Protocol Buffers - Google's data interchange format
+// Copyright 2014 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef __GOOGLE_PROTOBUF_RUBY_PROTOBUF_H__
+#define __GOOGLE_PROTOBUF_RUBY_PROTOBUF_H__
+
+#include <ruby/ruby.h>
+#include <ruby/vm.h>
+#include <ruby/encoding.h>
+
+#include "upb.h"
+
+// Forward decls.
+struct DescriptorPool;
+struct Descriptor;
+struct FieldDescriptor;
+struct EnumDescriptor;
+struct MessageLayout;
+struct MessageField;
+struct MessageHeader;
+struct MessageBuilderContext;
+struct EnumBuilderContext;
+struct Builder;
+
+typedef struct DescriptorPool DescriptorPool;
+typedef struct Descriptor Descriptor;
+typedef struct FieldDescriptor FieldDescriptor;
+typedef struct OneofDescriptor OneofDescriptor;
+typedef struct EnumDescriptor EnumDescriptor;
+typedef struct MessageLayout MessageLayout;
+typedef struct MessageField MessageField;
+typedef struct MessageHeader MessageHeader;
+typedef struct MessageBuilderContext MessageBuilderContext;
+typedef struct OneofBuilderContext OneofBuilderContext;
+typedef struct EnumBuilderContext EnumBuilderContext;
+typedef struct Builder Builder;
+
+/*
+ It can be a bit confusing how the C structs defined below and the Ruby
+ objects interact and hold references to each other. First, a few principles:
+
+ - Ruby's "TypedData" abstraction lets a Ruby VALUE hold a pointer to a C
+   struct (or arbitrary memory chunk), own it, and free it when collected.
+   Thus, each struct below will have a corresponding Ruby object
+   wrapping/owning it.
+
+ - To get back from an underlying upb {msg,enum}def to the Ruby object, we
+   keep a global hashmap, accessed by get_def_obj/add_def_obj below.
+
+ The in-memory structure is then something like:
+
+   Ruby                        |      upb
+                               |
+   DescriptorPool  ------------|-----------> upb_symtab____________________
+                               |                | (message types)          \
+                               |                v                           \
+   Descriptor   ---------------|-----------> upb_msgdef         (enum types)|
+    |--> msgclass              |                |   ^                       |
+    |    (dynamically built)   |                |   | (submsg fields)       |
+    |--> MessageLayout         |                |   |                       /
+    |--------------------------|> decoder method|   |                      /
+    \--------------------------|> serialize     |   |                     /
+                               |  handlers      v   |                    /
+   FieldDescriptor  -----------|-----------> upb_fielddef               /
+                               |                    |                  /
+                               |                    v (enum fields)   /
+   EnumDescriptor  ------------|-----------> upb_enumdef  <----------'
+                               |
+                               |
+               ^               |               \___/
+               `---------------|-----------------'    (get_def_obj map)
+ */
+
+// -----------------------------------------------------------------------------
+// Ruby class structure definitions.
+// -----------------------------------------------------------------------------
+
+struct DescriptorPool {
+  upb_symtab* symtab;
+};
+
+struct Descriptor {
+  const upb_msgdef* msgdef;
+  MessageLayout* layout;
+  VALUE klass;  // begins as nil
+  const upb_handlers* fill_handlers;
+  const upb_pbdecodermethod* fill_method;
+  const upb_handlers* pb_serialize_handlers;
+  const upb_handlers* json_serialize_handlers;
+  // Handlers hold type class references for sub-message fields directly in some
+  // cases. We need to keep these rooted because they might otherwise be
+  // collected.
+  VALUE typeclass_references;
+};
+
+struct FieldDescriptor {
+  const upb_fielddef* fielddef;
+};
+
+struct OneofDescriptor {
+  const upb_oneofdef* oneofdef;
+};
+
+struct EnumDescriptor {
+  const upb_enumdef* enumdef;
+  VALUE module;  // begins as nil
+};
+
+struct MessageBuilderContext {
+  VALUE descriptor;
+  VALUE builder;
+};
+
+struct OneofBuilderContext {
+  VALUE descriptor;
+  VALUE builder;
+};
+
+struct EnumBuilderContext {
+  VALUE enumdesc;
+};
+
+struct Builder {
+  VALUE pending_list;
+  upb_def** defs;  // used only while finalizing
+};
+
+extern VALUE cDescriptorPool;
+extern VALUE cDescriptor;
+extern VALUE cFieldDescriptor;
+extern VALUE cEnumDescriptor;
+extern VALUE cMessageBuilderContext;
+extern VALUE cOneofBuilderContext;
+extern VALUE cEnumBuilderContext;
+extern VALUE cBuilder;
+
+extern VALUE cError;
+extern VALUE cParseError;
+
+// We forward-declare all of the Ruby method implementations here because we
+// sometimes call the methods directly across .c files, rather than going
+// through Ruby's method dispatching (e.g. during message parse). It's cleaner
+// to keep the list of object methods together than to split them between
+// static-in-file definitions and header declarations.
+
+void DescriptorPool_mark(void* _self);
+void DescriptorPool_free(void* _self);
+VALUE DescriptorPool_alloc(VALUE klass);
+void DescriptorPool_register(VALUE module);
+DescriptorPool* ruby_to_DescriptorPool(VALUE value);
+VALUE DescriptorPool_add(VALUE _self, VALUE def);
+VALUE DescriptorPool_build(VALUE _self);
+VALUE DescriptorPool_lookup(VALUE _self, VALUE name);
+VALUE DescriptorPool_generated_pool(VALUE _self);
+
+void Descriptor_mark(void* _self);
+void Descriptor_free(void* _self);
+VALUE Descriptor_alloc(VALUE klass);
+void Descriptor_register(VALUE module);
+Descriptor* ruby_to_Descriptor(VALUE value);
+VALUE Descriptor_name(VALUE _self);
+VALUE Descriptor_name_set(VALUE _self, VALUE str);
+VALUE Descriptor_each(VALUE _self);
+VALUE Descriptor_lookup(VALUE _self, VALUE name);
+VALUE Descriptor_add_field(VALUE _self, VALUE obj);
+VALUE Descriptor_add_oneof(VALUE _self, VALUE obj);
+VALUE Descriptor_each_oneof(VALUE _self);
+VALUE Descriptor_lookup_oneof(VALUE _self, VALUE name);
+VALUE Descriptor_msgclass(VALUE _self);
+extern const rb_data_type_t _Descriptor_type;
+
+void FieldDescriptor_mark(void* _self);
+void FieldDescriptor_free(void* _self);
+VALUE FieldDescriptor_alloc(VALUE klass);
+void FieldDescriptor_register(VALUE module);
+FieldDescriptor* ruby_to_FieldDescriptor(VALUE value);
+VALUE FieldDescriptor_name(VALUE _self);
+VALUE FieldDescriptor_name_set(VALUE _self, VALUE str);
+VALUE FieldDescriptor_type(VALUE _self);
+VALUE FieldDescriptor_type_set(VALUE _self, VALUE type);
+VALUE FieldDescriptor_label(VALUE _self);
+VALUE FieldDescriptor_label_set(VALUE _self, VALUE label);
+VALUE FieldDescriptor_number(VALUE _self);
+VALUE FieldDescriptor_number_set(VALUE _self, VALUE number);
+VALUE FieldDescriptor_submsg_name(VALUE _self);
+VALUE FieldDescriptor_submsg_name_set(VALUE _self, VALUE value);
+VALUE FieldDescriptor_subtype(VALUE _self);
+VALUE FieldDescriptor_get(VALUE _self, VALUE msg_rb);
+VALUE FieldDescriptor_set(VALUE _self, VALUE msg_rb, VALUE value);
+upb_fieldtype_t ruby_to_fieldtype(VALUE type);
+VALUE fieldtype_to_ruby(upb_fieldtype_t type);
+
+void OneofDescriptor_mark(void* _self);
+void OneofDescriptor_free(void* _self);
+VALUE OneofDescriptor_alloc(VALUE klass);
+void OneofDescriptor_register(VALUE module);
+OneofDescriptor* ruby_to_OneofDescriptor(VALUE value);
+VALUE OneofDescriptor_name(VALUE _self);
+VALUE OneofDescriptor_name_set(VALUE _self, VALUE value);
+VALUE OneofDescriptor_add_field(VALUE _self, VALUE field);
+VALUE OneofDescriptor_each(VALUE _self, VALUE field);
+
+void EnumDescriptor_mark(void* _self);
+void EnumDescriptor_free(void* _self);
+VALUE EnumDescriptor_alloc(VALUE klass);
+void EnumDescriptor_register(VALUE module);
+EnumDescriptor* ruby_to_EnumDescriptor(VALUE value);
+VALUE EnumDescriptor_name(VALUE _self);
+VALUE EnumDescriptor_name_set(VALUE _self, VALUE str);
+VALUE EnumDescriptor_add_value(VALUE _self, VALUE name, VALUE number);
+VALUE EnumDescriptor_lookup_name(VALUE _self, VALUE name);
+VALUE EnumDescriptor_lookup_value(VALUE _self, VALUE number);
+VALUE EnumDescriptor_each(VALUE _self);
+VALUE EnumDescriptor_enummodule(VALUE _self);
+extern const rb_data_type_t _EnumDescriptor_type;
+
+void MessageBuilderContext_mark(void* _self);
+void MessageBuilderContext_free(void* _self);
+VALUE MessageBuilderContext_alloc(VALUE klass);
+void MessageBuilderContext_register(VALUE module);
+MessageBuilderContext* ruby_to_MessageBuilderContext(VALUE value);
+VALUE MessageBuilderContext_initialize(VALUE _self,
+                                       VALUE descriptor,
+                                       VALUE builder);
+VALUE MessageBuilderContext_optional(int argc, VALUE* argv, VALUE _self);
+VALUE MessageBuilderContext_required(int argc, VALUE* argv, VALUE _self);
+VALUE MessageBuilderContext_repeated(int argc, VALUE* argv, VALUE _self);
+VALUE MessageBuilderContext_map(int argc, VALUE* argv, VALUE _self);
+VALUE MessageBuilderContext_oneof(VALUE _self, VALUE name);
+
+void OneofBuilderContext_mark(void* _self);
+void OneofBuilderContext_free(void* _self);
+VALUE OneofBuilderContext_alloc(VALUE klass);
+void OneofBuilderContext_register(VALUE module);
+OneofBuilderContext* ruby_to_OneofBuilderContext(VALUE value);
+VALUE OneofBuilderContext_initialize(VALUE _self,
+                                     VALUE descriptor,
+                                     VALUE builder);
+VALUE OneofBuilderContext_optional(int argc, VALUE* argv, VALUE _self);
+
+void EnumBuilderContext_mark(void* _self);
+void EnumBuilderContext_free(void* _self);
+VALUE EnumBuilderContext_alloc(VALUE klass);
+void EnumBuilderContext_register(VALUE module);
+EnumBuilderContext* ruby_to_EnumBuilderContext(VALUE value);
+VALUE EnumBuilderContext_initialize(VALUE _self, VALUE enumdesc);
+VALUE EnumBuilderContext_value(VALUE _self, VALUE name, VALUE number);
+
+void Builder_mark(void* _self);
+void Builder_free(void* _self);
+VALUE Builder_alloc(VALUE klass);
+void Builder_register(VALUE module);
+Builder* ruby_to_Builder(VALUE value);
+VALUE Builder_add_message(VALUE _self, VALUE name);
+VALUE Builder_add_enum(VALUE _self, VALUE name);
+VALUE Builder_finalize_to_pool(VALUE _self, VALUE pool_rb);
+
+// -----------------------------------------------------------------------------
+// Native slot storage abstraction.
+// -----------------------------------------------------------------------------
+
+#define NATIVE_SLOT_MAX_SIZE sizeof(uint64_t)
+
+size_t native_slot_size(upb_fieldtype_t type);
+void native_slot_set(upb_fieldtype_t type,
+                     VALUE type_class,
+                     void* memory,
+                     VALUE value);
+// Atomically (with respect to Ruby VM calls) either update the value and set a
+// oneof case, or do neither. If |case_memory| is null, then no case value is
+// set.
+void native_slot_set_value_and_case(upb_fieldtype_t type,
+                                    VALUE type_class,
+                                    void* memory,
+                                    VALUE value,
+                                    uint32_t* case_memory,
+                                    uint32_t case_number);
+VALUE native_slot_get(upb_fieldtype_t type,
+                      VALUE type_class,
+                      const void* memory);
+void native_slot_init(upb_fieldtype_t type, void* memory);
+void native_slot_mark(upb_fieldtype_t type, void* memory);
+void native_slot_dup(upb_fieldtype_t type, void* to, void* from);
+void native_slot_deep_copy(upb_fieldtype_t type, void* to, void* from);
+bool native_slot_eq(upb_fieldtype_t type, void* mem1, void* mem2);
+
+void native_slot_validate_string_encoding(upb_fieldtype_t type, VALUE value);
+void native_slot_check_int_range_precision(upb_fieldtype_t type, VALUE value);
+
+extern rb_encoding* kRubyStringUtf8Encoding;
+extern rb_encoding* kRubyStringASCIIEncoding;
+extern rb_encoding* kRubyString8bitEncoding;
+
+VALUE field_type_class(const upb_fielddef* field);
+
+#define MAP_KEY_FIELD 1
+#define MAP_VALUE_FIELD 2
+
+// Oneof case slot value to indicate that no oneof case is set. The value `0` is
+// safe because field numbers are used as case identifiers, and no field can
+// have a number of 0.
+#define ONEOF_CASE_NONE 0
+
+// These operate on a map field (i.e., a repeated field of submessages whose
+// submessage type is a map-entry msgdef).
+bool is_map_field(const upb_fielddef* field);
+const upb_fielddef* map_field_key(const upb_fielddef* field);
+const upb_fielddef* map_field_value(const upb_fielddef* field);
+
+// These operate on a map-entry msgdef.
+const upb_fielddef* map_entry_key(const upb_msgdef* msgdef);
+const upb_fielddef* map_entry_value(const upb_msgdef* msgdef);
+
+// -----------------------------------------------------------------------------
+// Repeated field container type.
+// -----------------------------------------------------------------------------
+
+typedef struct {
+  upb_fieldtype_t field_type;
+  VALUE field_type_class;
+  void* elements;
+  int size;
+  int capacity;
+} RepeatedField;
+
+void RepeatedField_mark(void* self);
+void RepeatedField_free(void* self);
+VALUE RepeatedField_alloc(VALUE klass);
+VALUE RepeatedField_init(int argc, VALUE* argv, VALUE self);
+void RepeatedField_register(VALUE module);
+
+extern const rb_data_type_t RepeatedField_type;
+extern VALUE cRepeatedField;
+
+RepeatedField* ruby_to_RepeatedField(VALUE value);
+
+VALUE RepeatedField_each(VALUE _self);
+VALUE RepeatedField_index(int argc, VALUE* argv, VALUE _self);
+void* RepeatedField_index_native(VALUE _self, int index);
+VALUE RepeatedField_index_set(VALUE _self, VALUE _index, VALUE val);
+void RepeatedField_reserve(RepeatedField* self, int new_size);
+VALUE RepeatedField_push(VALUE _self, VALUE val);
+void RepeatedField_push_native(VALUE _self, void* data);
+VALUE RepeatedField_pop_one(VALUE _self);
+VALUE RepeatedField_insert(int argc, VALUE* argv, VALUE _self);
+VALUE RepeatedField_replace(VALUE _self, VALUE list);
+VALUE RepeatedField_clear(VALUE _self);
+VALUE RepeatedField_length(VALUE _self);
+VALUE RepeatedField_dup(VALUE _self);
+VALUE RepeatedField_deep_copy(VALUE _self);
+VALUE RepeatedField_to_ary(VALUE _self);
+VALUE RepeatedField_eq(VALUE _self, VALUE _other);
+VALUE RepeatedField_hash(VALUE _self);
+VALUE RepeatedField_inspect(VALUE _self);
+VALUE RepeatedField_plus(VALUE _self, VALUE list);
+
+// Defined in repeated_field.c; also used by Map.
+void validate_type_class(upb_fieldtype_t type, VALUE klass);
+
+// -----------------------------------------------------------------------------
+// Map container type.
+// -----------------------------------------------------------------------------
+
+typedef struct {
+  upb_fieldtype_t key_type;
+  upb_fieldtype_t value_type;
+  VALUE value_type_class;
+  upb_strtable table;
+} Map;
+
+void Map_mark(void* self);
+void Map_free(void* self);
+VALUE Map_alloc(VALUE klass);
+VALUE Map_init(int argc, VALUE* argv, VALUE self);
+void Map_register(VALUE module);
+
+extern const rb_data_type_t Map_type;
+extern VALUE cMap;
+
+Map* ruby_to_Map(VALUE value);
+
+VALUE Map_each(VALUE _self);
+VALUE Map_keys(VALUE _self);
+VALUE Map_values(VALUE _self);
+VALUE Map_index(VALUE _self, VALUE key);
+VALUE Map_index_set(VALUE _self, VALUE key, VALUE value);
+VALUE Map_has_key(VALUE _self, VALUE key);
+VALUE Map_delete(VALUE _self, VALUE key);
+VALUE Map_clear(VALUE _self);
+VALUE Map_length(VALUE _self);
+VALUE Map_dup(VALUE _self);
+VALUE Map_deep_copy(VALUE _self);
+VALUE Map_eq(VALUE _self, VALUE _other);
+VALUE Map_hash(VALUE _self);
+VALUE Map_inspect(VALUE _self);
+VALUE Map_merge(VALUE _self, VALUE hashmap);
+VALUE Map_merge_into_self(VALUE _self, VALUE hashmap);
+
+typedef struct {
+  Map* self;
+  upb_strtable_iter it;
+} Map_iter;
+
+void Map_begin(VALUE _self, Map_iter* iter);
+void Map_next(Map_iter* iter);
+bool Map_done(Map_iter* iter);
+VALUE Map_iter_key(Map_iter* iter);
+VALUE Map_iter_value(Map_iter* iter);
+
+// -----------------------------------------------------------------------------
+// Message layout / storage.
+// -----------------------------------------------------------------------------
+
+#define MESSAGE_FIELD_NO_CASE ((size_t)-1)
+
+struct MessageField {
+  size_t offset;
+  size_t case_offset;  // for oneofs, a uint32. Else, MESSAGE_FIELD_NO_CASE.
+};
+
+struct MessageLayout {
+  const upb_msgdef* msgdef;
+  MessageField* fields;
+  size_t size;
+};
+
+MessageLayout* create_layout(const upb_msgdef* msgdef);
+void free_layout(MessageLayout* layout);
+VALUE layout_get(MessageLayout* layout,
+                 const void* storage,
+                 const upb_fielddef* field);
+void layout_set(MessageLayout* layout,
+                void* storage,
+                const upb_fielddef* field,
+                VALUE val);
+void layout_init(MessageLayout* layout, void* storage);
+void layout_mark(MessageLayout* layout, void* storage);
+void layout_dup(MessageLayout* layout, void* to, void* from);
+void layout_deep_copy(MessageLayout* layout, void* to, void* from);
+VALUE layout_eq(MessageLayout* layout, void* msg1, void* msg2);
+VALUE layout_hash(MessageLayout* layout, void* storage);
+VALUE layout_inspect(MessageLayout* layout, void* storage);
+
+// -----------------------------------------------------------------------------
+// Message class creation.
+// -----------------------------------------------------------------------------
+
+struct MessageHeader {
+  Descriptor* descriptor;  // kept alive by self.class.descriptor reference.
+  // Data comes after this.
+};
+
+extern rb_data_type_t Message_type;
+
+VALUE build_class_from_descriptor(Descriptor* descriptor);
+void* Message_data(void* msg);
+void Message_mark(void* self);
+void Message_free(void* self);
+VALUE Message_alloc(VALUE klass);
+VALUE Message_method_missing(int argc, VALUE* argv, VALUE _self);
+VALUE Message_initialize(int argc, VALUE* argv, VALUE _self);
+VALUE Message_dup(VALUE _self);
+VALUE Message_deep_copy(VALUE _self);
+VALUE Message_eq(VALUE _self, VALUE _other);
+VALUE Message_hash(VALUE _self);
+VALUE Message_inspect(VALUE _self);
+VALUE Message_index(VALUE _self, VALUE field_name);
+VALUE Message_index_set(VALUE _self, VALUE field_name, VALUE value);
+VALUE Message_descriptor(VALUE klass);
+VALUE Message_decode(VALUE klass, VALUE data);
+VALUE Message_encode(VALUE klass, VALUE msg_rb);
+VALUE Message_decode_json(VALUE klass, VALUE data);
+VALUE Message_encode_json(VALUE klass, VALUE msg_rb);
+
+VALUE Google_Protobuf_deep_copy(VALUE self, VALUE obj);
+
+VALUE build_module_from_enumdesc(EnumDescriptor* enumdef);
+VALUE enum_lookup(VALUE self, VALUE number);
+VALUE enum_resolve(VALUE self, VALUE sym);
+
+const upb_pbdecodermethod *new_fillmsg_decodermethod(
+    Descriptor* descriptor, const void *owner);
+
+// Maximum depth allowed during encoding, to avoid stack overflows due to
+// cycles.
+#define ENCODE_MAX_NESTING 63
+
+// -----------------------------------------------------------------------------
+// Global map from upb {msg,enum}defs to wrapper Descriptor/EnumDescriptor
+// instances.
+// -----------------------------------------------------------------------------
+void add_def_obj(const void* def, VALUE value);
+VALUE get_def_obj(const void* def);
+
+// -----------------------------------------------------------------------------
+// Utilities.
+// -----------------------------------------------------------------------------
+
+void check_upb_status(const upb_status* status, const char* msg);
+
+#define CHECK_UPB(code, msg) do {                                             \
+    upb_status status = UPB_STATUS_INIT;                                      \
+    code;                                                                     \
+    check_upb_status(&status, msg);                                           \
+} while (0)
+
+extern ID descriptor_instancevar_interned;
+
+#endif  // __GOOGLE_PROTOBUF_RUBY_PROTOBUF_H__