Squashed 'libs/protobuf/' content from commit fcd3b9a85

git-subtree-dir: libs/protobuf
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ruby/ext/google/protobuf_c/defs.h

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+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 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 RUBY_PROTOBUF_DEFS_H_
+#define RUBY_PROTOBUF_DEFS_H_
+
+#include <ruby/ruby.h>
+
+#include "protobuf.h"
+#include "ruby-upb.h"
+
+// -----------------------------------------------------------------------------
+// TypeInfo
+// -----------------------------------------------------------------------------
+
+// This bundles a upb_CType and msgdef/enumdef when appropriate. This is
+// convenient for functions that need type information but cannot necessarily
+// assume a upb_FieldDef will be available.
+//
+// For example, Google::Protobuf::Map and Google::Protobuf::RepeatedField can
+// be constructed with type information alone:
+//
+//   # RepeatedField will internally store the type information in a TypeInfo.
+//   Google::Protobuf::RepeatedField.new(:message, FooMessage)
+
+typedef struct {
+  upb_CType type;
+  union {
+    const upb_MessageDef* msgdef;  // When type == kUpb_CType_Message
+    const upb_EnumDef* enumdef;    // When type == kUpb_CType_Enum
+  } def;
+} TypeInfo;
+
+static inline TypeInfo TypeInfo_get(const upb_FieldDef* f) {
+  TypeInfo ret = {upb_FieldDef_CType(f), {NULL}};
+  switch (ret.type) {
+    case kUpb_CType_Message:
+      ret.def.msgdef = upb_FieldDef_MessageSubDef(f);
+      break;
+    case kUpb_CType_Enum:
+      ret.def.enumdef = upb_FieldDef_EnumSubDef(f);
+      break;
+    default:
+      break;
+  }
+  return ret;
+}
+
+TypeInfo TypeInfo_FromClass(int argc, VALUE* argv, int skip_arg,
+                            VALUE* type_class, VALUE* init_arg);
+
+static inline TypeInfo TypeInfo_from_type(upb_CType type) {
+  TypeInfo ret = {type};
+  assert(type != kUpb_CType_Message && type != kUpb_CType_Enum);
+  return ret;
+}
+
+// -----------------------------------------------------------------------------
+// Other utilities
+// -----------------------------------------------------------------------------
+
+VALUE Descriptor_DefToClass(const upb_MessageDef* m);
+
+// Returns the underlying msgdef, enumdef, or symtab (respectively) for the
+// given Descriptor, EnumDescriptor, or DescriptorPool Ruby object.
+const upb_EnumDef* EnumDescriptor_GetEnumDef(VALUE enum_desc_rb);
+const upb_DefPool* DescriptorPool_GetSymtab(VALUE desc_pool_rb);
+const upb_MessageDef* Descriptor_GetMsgDef(VALUE desc_rb);
+
+// Returns a upb field type for the given Ruby symbol
+// (eg. :float => kUpb_CType_Float).
+upb_CType ruby_to_fieldtype(VALUE type);
+
+// The singleton generated pool (a DescriptorPool object).
+extern VALUE generated_pool;
+
+// Call at startup to register all types in this module.
+void Defs_register(VALUE module);
+
+#endif  // RUBY_PROTOBUF_DEFS_H_