Pull new version of protobuf sources.

third_party/protobuf/ruby/ext/google/protobuf_c/message.c

+// 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.
+
+#include "protobuf.h"
+
+// -----------------------------------------------------------------------------
+// Class/module creation from msgdefs and enumdefs, respectively.
+// -----------------------------------------------------------------------------
+
+void* Message_data(void* msg) {
+  return ((uint8_t *)msg) + sizeof(MessageHeader);
+}
+
+void Message_mark(void* _self) {
+  MessageHeader* self = (MessageHeader *)_self;
+  layout_mark(self->descriptor->layout, Message_data(self));
+}
+
+void Message_free(void* self) {
+  xfree(self);
+}
+
+rb_data_type_t Message_type = {
+  "Message",
+  { Message_mark, Message_free, NULL },
+};
+
+VALUE Message_alloc(VALUE klass) {
+  VALUE descriptor = rb_ivar_get(klass, descriptor_instancevar_interned);
+  Descriptor* desc = ruby_to_Descriptor(descriptor);
+  MessageHeader* msg = (MessageHeader*)ALLOC_N(
+      uint8_t, sizeof(MessageHeader) + desc->layout->size);
+  memset(Message_data(msg), 0, desc->layout->size);
+
+  // We wrap first so that everything in the message object is GC-rooted in case
+  // a collection happens during object creation in layout_init().
+  VALUE ret = TypedData_Wrap_Struct(klass, &Message_type, msg);
+  msg->descriptor = desc;
+  rb_ivar_set(ret, descriptor_instancevar_interned, descriptor);
+
+  layout_init(desc->layout, Message_data(msg));
+
+  return ret;
+}
+
+static VALUE which_oneof_field(MessageHeader* self, const upb_oneofdef* o) {
+  // If no fields in the oneof, always nil.
+  if (upb_oneofdef_numfields(o) == 0) {
+    return Qnil;
+  }
+  // Grab the first field in the oneof so we can get its layout info to find the
+  // oneof_case field.
+  upb_oneof_iter it;
+  upb_oneof_begin(&it, o);
+  assert(!upb_oneof_done(&it));
+  const upb_fielddef* first_field = upb_oneof_iter_field(&it);
+  assert(upb_fielddef_containingoneof(first_field) != NULL);
+
+  size_t case_ofs =
+      self->descriptor->layout->
+      fields[upb_fielddef_index(first_field)].case_offset;
+  uint32_t oneof_case = *((uint32_t*)((char*)Message_data(self) + case_ofs));
+
+  if (oneof_case == ONEOF_CASE_NONE) {
+    return Qnil;
+  }
+
+  // oneof_case is a field index, so find that field.
+  const upb_fielddef* f = upb_oneofdef_itof(o, oneof_case);
+  assert(f != NULL);
+
+  return ID2SYM(rb_intern(upb_fielddef_name(f)));
+}
+
+/*
+ * call-seq:
+ *     Message.method_missing(*args)
+ *
+ * Provides accessors and setters for message fields according to their field
+ * names. For any field whose name does not conflict with a built-in method, an
+ * accessor is provided with the same name as the field, and a setter is
+ * provided with the name of the field plus the '=' suffix. Thus, given a
+ * message instance 'msg' with field 'foo', the following code is valid:
+ *
+ *     msg.foo = 42
+ *     puts msg.foo
+ *
+ * This method also provides read-only accessors for oneofs. If a oneof exists
+ * with name 'my_oneof', then msg.my_oneof will return a Ruby symbol equal to
+ * the name of the field in that oneof that is currently set, or nil if none.
+ */
+VALUE Message_method_missing(int argc, VALUE* argv, VALUE _self) {
+  MessageHeader* self;
+  TypedData_Get_Struct(_self, MessageHeader, &Message_type, self);
+  if (argc < 1) {
+    rb_raise(rb_eArgError, "Expected method name as first argument.");
+  }
+  VALUE method_name = argv[0];
+  if (!SYMBOL_P(method_name)) {
+    rb_raise(rb_eArgError, "Expected symbol as method name.");
+  }
+  VALUE method_str = rb_id2str(SYM2ID(method_name));
+  char* name = RSTRING_PTR(method_str);
+  size_t name_len = RSTRING_LEN(method_str);
+  bool setter = false;
+
+  // Setters have names that end in '='.
+  if (name[name_len - 1] == '=') {
+    setter = true;
+    name_len--;
+  }
+
+  // Check for a oneof name first.
+  const upb_oneofdef* o = upb_msgdef_ntoo(self->descriptor->msgdef,
+                                          name, name_len);
+  if (o != NULL) {
+    if (setter) {
+      rb_raise(rb_eRuntimeError, "Oneof accessors are read-only.");
+    }
+    return which_oneof_field(self, o);
+  }
+
+  // Otherwise, check for a field with that name.
+  const upb_fielddef* f = upb_msgdef_ntof(self->descriptor->msgdef,
+                                          name, name_len);
+
+  if (f == NULL) {
+    rb_raise(rb_eArgError, "Unknown field");
+  }
+
+  if (setter) {
+    if (argc < 2) {
+      rb_raise(rb_eArgError, "No value provided to setter.");
+    }
+    layout_set(self->descriptor->layout, Message_data(self), f, argv[1]);
+    return Qnil;
+  } else {
+    return layout_get(self->descriptor->layout, Message_data(self), f);
+  }
+}
+
+int Message_initialize_kwarg(VALUE key, VALUE val, VALUE _self) {
+  MessageHeader* self;
+  TypedData_Get_Struct(_self, MessageHeader, &Message_type, self);
+
+  if (!SYMBOL_P(key)) {
+    rb_raise(rb_eArgError,
+             "Expected symbols as hash keys in initialization map.");
+  }
+
+  VALUE method_str = rb_id2str(SYM2ID(key));
+  char* name = RSTRING_PTR(method_str);
+  const upb_fielddef* f = upb_msgdef_ntofz(self->descriptor->msgdef, name);
+  if (f == NULL) {
+    rb_raise(rb_eArgError,
+             "Unknown field name in initialization map entry.");
+  }
+
+  if (is_map_field(f)) {
+    if (TYPE(val) != T_HASH) {
+      rb_raise(rb_eArgError,
+               "Expected Hash object as initializer value for map field.");
+    }
+    VALUE map = layout_get(self->descriptor->layout, Message_data(self), f);
+    Map_merge_into_self(map, val);
+  } else if (upb_fielddef_label(f) == UPB_LABEL_REPEATED) {
+    if (TYPE(val) != T_ARRAY) {
+      rb_raise(rb_eArgError,
+               "Expected array as initializer value for repeated field.");
+    }
+    VALUE ary = layout_get(self->descriptor->layout, Message_data(self), f);
+    for (int i = 0; i < RARRAY_LEN(val); i++) {
+      RepeatedField_push(ary, rb_ary_entry(val, i));
+    }
+  } else {
+    layout_set(self->descriptor->layout, Message_data(self), f, val);
+  }
+  return 0;
+}
+
+/*
+ * call-seq:
+ *     Message.new(kwargs) => new_message
+ *
+ * Creates a new instance of the given message class. Keyword arguments may be
+ * provided with keywords corresponding to field names.
+ *
+ * Note that no literal Message class exists. Only concrete classes per message
+ * type exist, as provided by the #msgclass method on Descriptors after they
+ * have been added to a pool. The method definitions described here on the
+ * Message class are provided on each concrete message class.
+ */
+VALUE Message_initialize(int argc, VALUE* argv, VALUE _self) {
+  if (argc == 0) {
+    return Qnil;
+  }
+  if (argc != 1) {
+    rb_raise(rb_eArgError, "Expected 0 or 1 arguments.");
+  }
+  VALUE hash_args = argv[0];
+  if (TYPE(hash_args) != T_HASH) {
+    rb_raise(rb_eArgError, "Expected hash arguments.");
+  }
+
+  rb_hash_foreach(hash_args, Message_initialize_kwarg, _self);
+  return Qnil;
+}
+
+/*
+ * call-seq:
+ *     Message.dup => new_message
+ *
+ * Performs a shallow copy of this message and returns the new copy.
+ */
+VALUE Message_dup(VALUE _self) {
+  MessageHeader* self;
+  TypedData_Get_Struct(_self, MessageHeader, &Message_type, self);
+
+  VALUE new_msg = rb_class_new_instance(0, NULL, CLASS_OF(_self));
+  MessageHeader* new_msg_self;
+  TypedData_Get_Struct(new_msg, MessageHeader, &Message_type, new_msg_self);
+
+  layout_dup(self->descriptor->layout,
+             Message_data(new_msg_self),
+             Message_data(self));
+
+  return new_msg;
+}
+
+// Internal only; used by Google::Protobuf.deep_copy.
+VALUE Message_deep_copy(VALUE _self) {
+  MessageHeader* self;
+  TypedData_Get_Struct(_self, MessageHeader, &Message_type, self);
+
+  VALUE new_msg = rb_class_new_instance(0, NULL, CLASS_OF(_self));
+  MessageHeader* new_msg_self;
+  TypedData_Get_Struct(new_msg, MessageHeader, &Message_type, new_msg_self);
+
+  layout_deep_copy(self->descriptor->layout,
+                   Message_data(new_msg_self),
+                   Message_data(self));
+
+  return new_msg;
+}
+
+/*
+ * call-seq:
+ *     Message.==(other) => boolean
+ *
+ * Performs a deep comparison of this message with another. Messages are equal
+ * if they have the same type and if each field is equal according to the :==
+ * method's semantics (a more efficient comparison may actually be done if the
+ * field is of a primitive type).
+ */
+VALUE Message_eq(VALUE _self, VALUE _other) {
+  MessageHeader* self;
+  TypedData_Get_Struct(_self, MessageHeader, &Message_type, self);
+
+  MessageHeader* other;
+  TypedData_Get_Struct(_other, MessageHeader, &Message_type, other);
+
+  if (self->descriptor != other->descriptor) {
+    return Qfalse;
+  }
+
+  return layout_eq(self->descriptor->layout,
+                   Message_data(self),
+                   Message_data(other));
+}
+
+/*
+ * call-seq:
+ *     Message.hash => hash_value
+ *
+ * Returns a hash value that represents this message's field values.
+ */
+VALUE Message_hash(VALUE _self) {
+  MessageHeader* self;
+  TypedData_Get_Struct(_self, MessageHeader, &Message_type, self);
+
+  return layout_hash(self->descriptor->layout, Message_data(self));
+}
+
+/*
+ * call-seq:
+ *     Message.inspect => string
+ *
+ * Returns a human-readable string representing this message. It will be
+ * formatted as "<MessageType: field1: value1, field2: value2, ...>". Each
+ * field's value is represented according to its own #inspect method.
+ */
+VALUE Message_inspect(VALUE _self) {
+  MessageHeader* self;
+  TypedData_Get_Struct(_self, MessageHeader, &Message_type, self);
+
+  VALUE str = rb_str_new2("<");
+  str = rb_str_append(str, rb_str_new2(rb_class2name(CLASS_OF(_self))));
+  str = rb_str_cat2(str, ": ");
+  str = rb_str_append(str, layout_inspect(
+      self->descriptor->layout, Message_data(self)));
+  str = rb_str_cat2(str, ">");
+  return str;
+}
+
+
+VALUE Message_to_h(VALUE _self) {
+  MessageHeader* self;
+  TypedData_Get_Struct(_self, MessageHeader, &Message_type, self);
+
+  VALUE hash = rb_hash_new();
+
+  upb_msg_field_iter it;
+  for (upb_msg_field_begin(&it, self->descriptor->msgdef);
+       !upb_msg_field_done(&it);
+       upb_msg_field_next(&it)) {
+    const upb_fielddef* field = upb_msg_iter_field(&it);
+    VALUE msg_value = layout_get(self->descriptor->layout, Message_data(self),
+                                 field);
+    VALUE msg_key   = ID2SYM(rb_intern(upb_fielddef_name(field)));
+    if (upb_fielddef_label(field) == UPB_LABEL_REPEATED) {
+      msg_value = RepeatedField_to_ary(msg_value);
+    }
+    rb_hash_aset(hash, msg_key, msg_value);
+  }
+  return hash;
+}
+
+
+
+/*
+ * call-seq:
+ *     Message.[](index) => value
+ *
+ * Accesses a field's value by field name. The provided field name should be a
+ * string.
+ */
+VALUE Message_index(VALUE _self, VALUE field_name) {
+  MessageHeader* self;
+  TypedData_Get_Struct(_self, MessageHeader, &Message_type, self);
+  Check_Type(field_name, T_STRING);
+  const upb_fielddef* field =
+      upb_msgdef_ntofz(self->descriptor->msgdef, RSTRING_PTR(field_name));
+  if (field == NULL) {
+    return Qnil;
+  }
+  return layout_get(self->descriptor->layout, Message_data(self), field);
+}
+
+/*
+ * call-seq:
+ *     Message.[]=(index, value)
+ *
+ * Sets a field's value by field name. The provided field name should be a
+ * string.
+ */
+VALUE Message_index_set(VALUE _self, VALUE field_name, VALUE value) {
+  MessageHeader* self;
+  TypedData_Get_Struct(_self, MessageHeader, &Message_type, self);
+  Check_Type(field_name, T_STRING);
+  const upb_fielddef* field =
+      upb_msgdef_ntofz(self->descriptor->msgdef, RSTRING_PTR(field_name));
+  if (field == NULL) {
+    rb_raise(rb_eArgError, "Unknown field: %s", RSTRING_PTR(field_name));
+  }
+  layout_set(self->descriptor->layout, Message_data(self), field, value);
+  return Qnil;
+}
+
+/*
+ * call-seq:
+ *     Message.descriptor => descriptor
+ *
+ * Class method that returns the Descriptor instance corresponding to this
+ * message class's type.
+ */
+VALUE Message_descriptor(VALUE klass) {
+  return rb_ivar_get(klass, descriptor_instancevar_interned);
+}
+
+VALUE build_class_from_descriptor(Descriptor* desc) {
+  if (desc->layout == NULL) {
+    desc->layout = create_layout(desc->msgdef);
+  }
+  if (desc->fill_method == NULL) {
+    desc->fill_method = new_fillmsg_decodermethod(desc, &desc->fill_method);
+  }
+
+  const char* name = upb_msgdef_fullname(desc->msgdef);
+  if (name == NULL) {
+    rb_raise(rb_eRuntimeError, "Descriptor does not have assigned name.");
+  }
+
+  VALUE klass = rb_define_class_id(
+      // Docs say this parameter is ignored. User will assign return value to
+      // their own toplevel constant class name.
+      rb_intern("Message"),
+      rb_cObject);
+  rb_ivar_set(klass, descriptor_instancevar_interned,
+              get_def_obj(desc->msgdef));
+  rb_define_alloc_func(klass, Message_alloc);
+  rb_require("google/protobuf/message_exts");
+  rb_include_module(klass, rb_eval_string("Google::Protobuf::MessageExts"));
+  rb_extend_object(
+      klass, rb_eval_string("Google::Protobuf::MessageExts::ClassMethods"));
+
+  rb_define_method(klass, "method_missing",
+                   Message_method_missing, -1);
+  rb_define_method(klass, "initialize", Message_initialize, -1);
+  rb_define_method(klass, "dup", Message_dup, 0);
+  // Also define #clone so that we don't inherit Object#clone.
+  rb_define_method(klass, "clone", Message_dup, 0);
+  rb_define_method(klass, "==", Message_eq, 1);
+  rb_define_method(klass, "hash", Message_hash, 0);
+  rb_define_method(klass, "to_h", Message_to_h, 0);
+  rb_define_method(klass, "to_hash", Message_to_h, 0);
+  rb_define_method(klass, "inspect", Message_inspect, 0);
+  rb_define_method(klass, "[]", Message_index, 1);
+  rb_define_method(klass, "[]=", Message_index_set, 2);
+  rb_define_singleton_method(klass, "decode", Message_decode, 1);
+  rb_define_singleton_method(klass, "encode", Message_encode, 1);
+  rb_define_singleton_method(klass, "decode_json", Message_decode_json, 1);
+  rb_define_singleton_method(klass, "encode_json", Message_encode_json, 1);
+  rb_define_singleton_method(klass, "descriptor", Message_descriptor, 0);
+
+  return klass;
+}
+
+/*
+ * call-seq:
+ *     Enum.lookup(number) => name
+ *
+ * This module method, provided on each generated enum module, looks up an enum
+ * value by number and returns its name as a Ruby symbol, or nil if not found.
+ */
+VALUE enum_lookup(VALUE self, VALUE number) {
+  int32_t num = NUM2INT(number);
+  VALUE desc = rb_ivar_get(self, descriptor_instancevar_interned);
+  EnumDescriptor* enumdesc = ruby_to_EnumDescriptor(desc);
+
+  const char* name = upb_enumdef_iton(enumdesc->enumdef, num);
+  if (name == NULL) {
+    return Qnil;
+  } else {
+    return ID2SYM(rb_intern(name));
+  }
+}
+
+/*
+ * call-seq:
+ *     Enum.resolve(name) => number
+ *
+ * This module method, provided on each generated enum module, looks up an enum
+ * value by name (as a Ruby symbol) and returns its name, or nil if not found.
+ */
+VALUE enum_resolve(VALUE self, VALUE sym) {
+  const char* name = rb_id2name(SYM2ID(sym));
+  VALUE desc = rb_ivar_get(self, descriptor_instancevar_interned);
+  EnumDescriptor* enumdesc = ruby_to_EnumDescriptor(desc);
+
+  int32_t num = 0;
+  bool found = upb_enumdef_ntoiz(enumdesc->enumdef, name, &num);
+  if (!found) {
+    return Qnil;
+  } else {
+    return INT2NUM(num);
+  }
+}
+
+/*
+ * call-seq:
+ *     Enum.descriptor
+ *
+ * This module method, provided on each generated enum module, returns the
+ * EnumDescriptor corresponding to this enum type.
+ */
+VALUE enum_descriptor(VALUE self) {
+  return rb_ivar_get(self, descriptor_instancevar_interned);
+}
+
+VALUE build_module_from_enumdesc(EnumDescriptor* enumdesc) {
+  VALUE mod = rb_define_module_id(
+      rb_intern(upb_enumdef_fullname(enumdesc->enumdef)));
+
+  upb_enum_iter it;
+  for (upb_enum_begin(&it, enumdesc->enumdef);
+       !upb_enum_done(&it);
+       upb_enum_next(&it)) {
+    const char* name = upb_enum_iter_name(&it);
+    int32_t value = upb_enum_iter_number(&it);
+    if (name[0] < 'A' || name[0] > 'Z') {
+      rb_raise(rb_eTypeError,
+               "Enum value '%s' does not start with an uppercase letter "
+               "as is required for Ruby constants.",
+               name);
+    }
+    rb_define_const(mod, name, INT2NUM(value));
+  }
+
+  rb_define_singleton_method(mod, "lookup", enum_lookup, 1);
+  rb_define_singleton_method(mod, "resolve", enum_resolve, 1);
+  rb_define_singleton_method(mod, "descriptor", enum_descriptor, 0);
+  rb_ivar_set(mod, descriptor_instancevar_interned,
+              get_def_obj(enumdesc->enumdef));
+
+  return mod;
+}
+
+/*
+ * call-seq:
+ *     Google::Protobuf.deep_copy(obj) => copy_of_obj
+ *
+ * Performs a deep copy of a RepeatedField instance, a Map instance, or a
+ * message object, recursively copying its members.
+ */
+VALUE Google_Protobuf_deep_copy(VALUE self, VALUE obj) {
+  VALUE klass = CLASS_OF(obj);
+  if (klass == cRepeatedField) {
+    return RepeatedField_deep_copy(obj);
+  } else if (klass == cMap) {
+    return Map_deep_copy(obj);
+  } else {
+    return Message_deep_copy(obj);
+  }
+}