1 /*
2 * Copyright 2019 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "fields/struct_field.h"
18 #include "util.h"
19
20 const std::string StructField::kFieldType = "StructField";
21
StructField(std::string name,std::string type_name,Size size,ParseLocation loc)22 StructField::StructField(std::string name, std::string type_name, Size size, ParseLocation loc)
23 : PacketField(name, loc), type_name_(type_name), size_(size) {}
24
GetFieldType() const25 const std::string& StructField::GetFieldType() const {
26 return StructField::kFieldType;
27 }
28
GetSize() const29 Size StructField::GetSize() const {
30 return size_;
31 }
32
GetBuilderSize() const33 Size StructField::GetBuilderSize() const {
34 std::string ret = "(" + GetName() + "_.size() * 8)";
35 return ret;
36 }
37
GetDataType() const38 std::string StructField::GetDataType() const {
39 return type_name_;
40 }
41
GenExtractor(std::ostream & s,int,bool) const42 void StructField::GenExtractor(std::ostream& s, int, bool) const {
43 s << GetName() << "_it = ";
44 s << GetDataType() << "::Parse(" << GetName() << "_ptr, " << GetName() << "_it);";
45 }
46
GetGetterFunctionName() const47 std::string StructField::GetGetterFunctionName() const {
48 std::stringstream ss;
49 ss << "Get" << util::UnderscoreToCamelCase(GetName());
50 return ss.str();
51 }
52
GenGetter(std::ostream & s,Size start_offset,Size end_offset) const53 void StructField::GenGetter(std::ostream& s, Size start_offset, Size end_offset) const {
54 s << GetDataType() << " " << GetGetterFunctionName() << "() const {";
55 s << "ASSERT(was_validated_);";
56 s << "size_t end_index = size();";
57 s << "auto to_bound = begin();";
58 int num_leading_bits = GenBounds(s, start_offset, end_offset, GetSize());
59 s << GetDataType() << " " << GetName() << "_value{};";
60 s << GetDataType() << "* " << GetName() << "_ptr = &" << GetName() << "_value;";
61 GenExtractor(s, num_leading_bits, false);
62
63 s << "return " << GetName() << "_value;";
64 s << "}\n";
65 }
66
GetBuilderParameterType() const67 std::string StructField::GetBuilderParameterType() const {
68 return GetDataType();
69 }
70
HasParameterValidator() const71 bool StructField::HasParameterValidator() const {
72 return false;
73 }
74
GenParameterValidator(std::ostream &) const75 void StructField::GenParameterValidator(std::ostream&) const {
76 // Validated at compile time.
77 }
78
GenInserter(std::ostream & s) const79 void StructField::GenInserter(std::ostream& s) const {
80 s << GetName() << "_.Serialize(i);";
81 }
82
GenValidator(std::ostream &) const83 void StructField::GenValidator(std::ostream&) const {
84 // Do nothing
85 }
86
GenStringRepresentation(std::ostream & s,std::string accessor) const87 void StructField::GenStringRepresentation(std::ostream& s, std::string accessor) const {
88 s << accessor << ".ToString()";
89 }
90
GetRustDataType() const91 std::string StructField::GetRustDataType() const {
92 return GetDataType();
93 }
94
GenBoundsCheck(std::ostream &,Size,Size,std::string) const95 void StructField::GenBoundsCheck(std::ostream&, Size, Size, std::string) const {
96 // implicitly checked by the struct parser
97 }
98
GenRustGetter(std::ostream & s,Size start_offset,Size) const99 void StructField::GenRustGetter(std::ostream& s, Size start_offset, Size) const {
100 s << "let " << GetName() << " = ";
101 s << GetRustDataType() << "::parse(&bytes[" << start_offset.bytes() << "..";
102 s << start_offset.bytes() + GetSize().bytes() << "]).unwrap();";
103 }
104
GenRustWriter(std::ostream & s,Size start_offset,Size) const105 void StructField::GenRustWriter(std::ostream& s, Size start_offset, Size) const {
106 s << "let " << GetName() << " = &mut buffer[" << start_offset.bytes();
107 s << ".." << start_offset.bytes() + GetSize().bytes() << "];";
108 s << "self." << GetName() << ".write_to(" << GetName() << ");";
109 }
110