1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
|
// 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.
// Author: kenton@google.com (Kenton Varda)
// Based on original Protocol Buffers design by
// Sanjay Ghemawat, Jeff Dean, and others.
#include <google/protobuf/compiler/cpp/extension.h>
#include <map>
#include <google/protobuf/io/printer.h>
#include <google/protobuf/stubs/strutil.h>
#include <google/protobuf/compiler/cpp/helpers.h>
#include <google/protobuf/descriptor.pb.h>
namespace google {
namespace protobuf {
namespace compiler {
namespace cpp {
ExtensionGenerator::ExtensionGenerator(const FieldDescriptor* descriptor,
const Options& options,
MessageSCCAnalyzer* scc_analyzer)
: descriptor_(descriptor), options_(options), scc_analyzer_(scc_analyzer) {
// Construct type_traits_.
if (descriptor_->is_repeated()) {
type_traits_ = "Repeated";
}
switch (descriptor_->cpp_type()) {
case FieldDescriptor::CPPTYPE_ENUM:
type_traits_.append("EnumTypeTraits< ");
type_traits_.append(ClassName(descriptor_->enum_type(), true));
type_traits_.append(", ");
type_traits_.append(ClassName(descriptor_->enum_type(), true));
type_traits_.append("_IsValid>");
break;
case FieldDescriptor::CPPTYPE_STRING:
type_traits_.append("StringTypeTraits");
break;
case FieldDescriptor::CPPTYPE_MESSAGE:
type_traits_.append("MessageTypeTraits< ");
type_traits_.append(ClassName(descriptor_->message_type(), true));
type_traits_.append(" >");
break;
default:
type_traits_.append("PrimitiveTypeTraits< ");
type_traits_.append(PrimitiveTypeName(options_, descriptor_->cpp_type()));
type_traits_.append(" >");
break;
}
SetCommonVars(options, &variables_);
SetCommonMessageDataVariables(descriptor_->containing_type(), &variables_);
variables_["extendee"] =
QualifiedClassName(descriptor_->containing_type(), options_);
variables_["type_traits"] = type_traits_;
TProtoStringType name = descriptor_->name();
variables_["name"] = ResolveKeyword(name);
variables_["constant_name"] = FieldConstantName(descriptor_);
variables_["field_type"] =
StrCat(static_cast<int>(descriptor_->type()));
variables_["packed"] = descriptor_->is_packed() ? "true" : "false";
TProtoStringType scope =
IsScoped() ? ClassName(descriptor_->extension_scope(), false) + "::" : "";
variables_["scope"] = scope;
variables_["scoped_name"] = ExtensionName(descriptor_);
variables_["number"] = StrCat(descriptor_->number());
bool add_verify_fn =
// Only verify msgs.
descriptor_->cpp_type() == FieldDescriptor::CPPTYPE_MESSAGE &&
// Options say to verify.
ShouldVerify(descriptor_->message_type(), options_, scc_analyzer_) &&
ShouldVerify(descriptor_->containing_type(), options_, scc_analyzer_);
variables_["verify_fn"] =
add_verify_fn
? StrCat("&", FieldMessageTypeName(descriptor_, options_),
"::InternalVerify")
: "nullptr";
}
ExtensionGenerator::~ExtensionGenerator() {}
bool ExtensionGenerator::IsScoped() const {
return descriptor_->extension_scope() != nullptr;
}
void ExtensionGenerator::GenerateDeclaration(io::Printer* printer) const {
Formatter format(printer, variables_);
// If this is a class member, it needs to be declared "static". Otherwise,
// it needs to be "extern". In the latter case, it also needs the DLL
// export/import specifier.
TProtoStringType qualifier;
if (!IsScoped()) {
qualifier = "extern";
if (!options_.dllexport_decl.empty()) {
qualifier = options_.dllexport_decl + " " + qualifier;
}
} else {
qualifier = "static";
}
format(
"static const int $constant_name$ = $number$;\n"
"$1$ ::$proto_ns$::internal::ExtensionIdentifier< $extendee$,\n"
" ::$proto_ns$::internal::$type_traits$, $field_type$, $packed$ >\n"
" ${2$$name$$}$;\n",
qualifier, descriptor_);
}
void ExtensionGenerator::GenerateDefinition(io::Printer* printer) {
// If we are building for lite with implicit weak fields, we want to skip over
// any custom options (i.e. extensions of messages from descriptor.proto).
// This prevents the creation of any unnecessary linker references to the
// descriptor messages.
if (options_.lite_implicit_weak_fields &&
descriptor_->containing_type()->file()->name() ==
"net/proto2/proto/descriptor.proto") {
return;
}
Formatter format(printer, variables_);
TProtoStringType default_str;
// If this is a class member, it needs to be declared in its class scope.
if (descriptor_->cpp_type() == FieldDescriptor::CPPTYPE_STRING) {
// We need to declare a global string which will contain the default value.
// We cannot declare it at class scope because that would require exposing
// it in the header which would be annoying for other reasons. So we
// replace :: with _ in the name and declare it as a global.
default_str =
StringReplace(variables_["scoped_name"], "::", "_", true) + "_default";
format("const TProtoStringType $1$($2$);\n", default_str,
DefaultValue(options_, descriptor_));
} else if (descriptor_->message_type()) {
// We have to initialize the default instance for extensions at registration
// time.
default_str =
FieldMessageTypeName(descriptor_, options_) + "::default_instance()";
} else {
default_str = DefaultValue(options_, descriptor_);
}
// Likewise, class members need to declare the field constant variable.
if (IsScoped()) {
format(
"#if !defined(_MSC_VER) || (_MSC_VER >= 1900 && _MSC_VER < 1912)\n"
"const int $scope$$constant_name$;\n"
"#endif\n");
}
format(
"PROTOBUF_ATTRIBUTE_INIT_PRIORITY2 "
"::$proto_ns$::internal::ExtensionIdentifier< $extendee$,\n"
" ::$proto_ns$::internal::$type_traits$, $field_type$, $packed$>\n"
" $scoped_name$($constant_name$, $1$, $verify_fn$);\n",
default_str);
}
} // namespace cpp
} // namespace compiler
} // namespace protobuf
} // namespace google
|
