1 /*
2 * Copyright (c) 2021 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #include "runtime/include/class_helper.h"
17
18 #include <algorithm>
19
20 #include "libpandabase/mem/mem.h"
21 #include "libpandabase/utils/bit_utils.h"
22 #include "runtime/include/class.h"
23 #include "runtime/include/coretypes/tagged_value.h"
24 #include "runtime/include/mem/panda_string.h"
25
26 namespace panda {
27
Pad(size_t size,size_t * padding,size_t * n)28 static void Pad(size_t size, size_t *padding, size_t *n)
29 {
30 while (*padding >= size && *n > 0) {
31 *padding -= size;
32 *n -= 1;
33 }
34 }
35
36 /* static */
ComputeClassSize(size_t vtable_size,size_t imt_size,size_t num_8bit_sfields,size_t num_16bit_sfields,size_t num_32bit_sfields,size_t num_64bit_sfields,size_t num_ref_sfields,size_t num_tagged_sfields)37 size_t ClassHelper::ComputeClassSize(size_t vtable_size, size_t imt_size, size_t num_8bit_sfields,
38 size_t num_16bit_sfields, size_t num_32bit_sfields, size_t num_64bit_sfields,
39 size_t num_ref_sfields, size_t num_tagged_sfields)
40 {
41 size_t size = sizeof(Class);
42 size = AlignUp(size, OBJECT_POINTER_SIZE);
43 size += vtable_size * POINTER_SIZE;
44 size += imt_size * POINTER_SIZE;
45 size += num_ref_sfields * OBJECT_POINTER_SIZE;
46
47 constexpr size_t SIZE_64 = sizeof(uint64_t);
48 constexpr size_t SIZE_32 = sizeof(uint32_t);
49 constexpr size_t SIZE_16 = sizeof(uint16_t);
50 constexpr size_t SIZE_8 = sizeof(uint8_t);
51
52 // Try to fill alignment gaps with fields that have smaller size from largest to smallests
53 static_assert(coretypes::TaggedValue::TaggedTypeSize() == SIZE_64,
54 "Please fix alignment of the fields of type \"TaggedValue\"");
55 if (!IsAligned<SIZE_64>(size) && (num_64bit_sfields > 0 || num_tagged_sfields > 0)) {
56 size_t padding = AlignUp(size, SIZE_64) - size;
57 size += padding;
58
59 Pad(SIZE_32, &padding, &num_32bit_sfields);
60 Pad(SIZE_16, &padding, &num_16bit_sfields);
61 Pad(SIZE_8, &padding, &num_8bit_sfields);
62 }
63
64 if (!IsAligned<SIZE_32>(size) && num_32bit_sfields > 0) {
65 size_t padding = AlignUp(size, SIZE_32) - size;
66 size += padding;
67
68 Pad(SIZE_16, &padding, &num_16bit_sfields);
69 Pad(SIZE_8, &padding, &num_8bit_sfields);
70 }
71
72 if (!IsAligned<SIZE_16>(size) && num_16bit_sfields > 0) {
73 size_t padding = AlignUp(size, SIZE_16) - size;
74 size += padding;
75
76 Pad(SIZE_8, &padding, &num_8bit_sfields);
77 }
78
79 size += num_64bit_sfields * SIZE_64 + num_32bit_sfields * SIZE_32 + num_16bit_sfields * SIZE_16 +
80 num_8bit_sfields * SIZE_8 + num_tagged_sfields * coretypes::TaggedValue::TaggedTypeSize();
81
82 return size;
83 }
84
85 /* static */
GetDescriptor(const uint8_t * name,PandaString * storage)86 const uint8_t *ClassHelper::GetDescriptor(const uint8_t *name, PandaString *storage)
87 {
88 return GetArrayDescriptor(name, 0, storage);
89 }
90
91 /* static */
GetArrayDescriptor(const uint8_t * component_name,size_t rank,PandaString * storage)92 const uint8_t *ClassHelper::GetArrayDescriptor(const uint8_t *component_name, size_t rank, PandaString *storage)
93 {
94 storage->clear();
95 storage->append(rank, '[');
96 storage->push_back('L');
97 storage->append(utf::Mutf8AsCString(component_name));
98 storage->push_back(';');
99 std::replace(storage->begin(), storage->end(), '.', '/');
100 return utf::CStringAsMutf8(storage->c_str());
101 }
102
103 /* static */
GetPrimitiveTypeDescriptorChar(panda_file::Type::TypeId type_id)104 char ClassHelper::GetPrimitiveTypeDescriptorChar(panda_file::Type::TypeId type_id)
105 {
106 // static_cast isn't necessary in most implementations but may be by standard
107 return static_cast<char>(*GetPrimitiveTypeDescriptorStr(type_id));
108 }
109
110 /* static */
GetPrimitiveTypeDescriptorStr(panda_file::Type::TypeId type_id)111 const uint8_t *ClassHelper::GetPrimitiveTypeDescriptorStr(panda_file::Type::TypeId type_id)
112 {
113 if (type_id == panda_file::Type::TypeId::REFERENCE) {
114 UNREACHABLE();
115 return nullptr;
116 }
117
118 return utf::CStringAsMutf8(panda_file::Type::GetSignatureByTypeId(panda_file::Type(type_id)));
119 }
120
121 /* static */
GetPrimitiveTypeStr(panda_file::Type::TypeId type_id)122 const char *ClassHelper::GetPrimitiveTypeStr(panda_file::Type::TypeId type_id)
123 {
124 switch (type_id) {
125 case panda_file::Type::TypeId::VOID:
126 return "void";
127 case panda_file::Type::TypeId::U1:
128 return "bool";
129 case panda_file::Type::TypeId::I8:
130 return "i8";
131 case panda_file::Type::TypeId::U8:
132 return "u8";
133 case panda_file::Type::TypeId::I16:
134 return "i16";
135 case panda_file::Type::TypeId::U16:
136 return "u16";
137 case panda_file::Type::TypeId::I32:
138 return "i32";
139 case panda_file::Type::TypeId::U32:
140 return "u32";
141 case panda_file::Type::TypeId::I64:
142 return "i64";
143 case panda_file::Type::TypeId::U64:
144 return "u64";
145 case panda_file::Type::TypeId::F32:
146 return "f32";
147 case panda_file::Type::TypeId::F64:
148 return "f64";
149 default:
150 UNREACHABLE();
151 break;
152 }
153 return nullptr;
154 }
155
156 /* static */
GetPrimitiveDescriptor(panda_file::Type type,PandaString * storage)157 const uint8_t *ClassHelper::GetPrimitiveDescriptor(panda_file::Type type, PandaString *storage)
158 {
159 return GetPrimitiveArrayDescriptor(type, 0, storage);
160 }
161
162 /* static */
GetPrimitiveArrayDescriptor(panda_file::Type type,size_t rank,PandaString * storage)163 const uint8_t *ClassHelper::GetPrimitiveArrayDescriptor(panda_file::Type type, size_t rank, PandaString *storage)
164 {
165 storage->clear();
166 storage->append(rank, '[');
167 storage->push_back(GetPrimitiveTypeDescriptorChar(type.GetId()));
168 return utf::CStringAsMutf8(storage->c_str());
169 }
170
171 /* static */
GetTypeDescriptor(const PandaString & name,PandaString * storage)172 const uint8_t *ClassHelper::GetTypeDescriptor(const PandaString &name, PandaString *storage)
173 {
174 *storage = "L" + name + ";";
175 std::replace(storage->begin(), storage->end(), '.', '/');
176 return utf::CStringAsMutf8(storage->c_str());
177 }
178
179 } // namespace panda
180