1 // Protocol Buffers - Google's data interchange format
2 // Copyright 2008 Google Inc. All rights reserved.
3 // https://developers.google.com/protocol-buffers/
4 //
5 // Redistribution and use in source and binary forms, with or without
6 // modification, are permitted provided that the following conditions are
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8 //
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10 // notice, this list of conditions and the following disclaimer.
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12 // copyright notice, this list of conditions and the following disclaimer
13 // in the documentation and/or other materials provided with the
14 // distribution.
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16 // contributors may be used to endorse or promote products derived from
17 // this software without specific prior written permission.
18 //
19 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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29 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30
31 // Author: kenton@google.com (Kenton Varda)
32 // Based on original Protocol Buffers design by
33 // Sanjay Ghemawat, Jeff Dean, and others.
34
35 #include <google/protobuf/repeated_field.h>
36
37 #include <algorithm>
38
39 #include <google/protobuf/stubs/logging.h>
40 #include <google/protobuf/stubs/common.h>
41 #include <google/protobuf/implicit_weak_message.h>
42
43 #include <google/protobuf/port_def.inc>
44
45 namespace google {
46 namespace protobuf {
47
48 namespace internal {
49
InternalExtend(int extend_amount)50 void** RepeatedPtrFieldBase::InternalExtend(int extend_amount) {
51 int new_size = current_size_ + extend_amount;
52 if (total_size_ >= new_size) {
53 // N.B.: rep_ is non-NULL because extend_amount is always > 0, hence
54 // total_size must be non-zero since it is lower-bounded by new_size.
55 return &rep_->elements[current_size_];
56 }
57 Rep* old_rep = rep_;
58 Arena* arena = GetArena();
59 new_size = std::max(internal::kRepeatedFieldLowerClampLimit,
60 std::max(total_size_ * 2, new_size));
61 GOOGLE_CHECK_LE(
62 static_cast<int64>(new_size),
63 static_cast<int64>((std::numeric_limits<size_t>::max() - kRepHeaderSize) /
64 sizeof(old_rep->elements[0])))
65 << "Requested size is too large to fit into size_t.";
66 size_t bytes = kRepHeaderSize + sizeof(old_rep->elements[0]) * new_size;
67 if (arena == NULL) {
68 rep_ = reinterpret_cast<Rep*>(::operator new(bytes));
69 } else {
70 rep_ = reinterpret_cast<Rep*>(Arena::CreateArray<char>(arena, bytes));
71 }
72 #if defined(__GXX_DELETE_WITH_SIZE__) || defined(__cpp_sized_deallocation)
73 const int old_total_size = total_size_;
74 #endif
75 total_size_ = new_size;
76 if (old_rep && old_rep->allocated_size > 0) {
77 memcpy(rep_->elements, old_rep->elements,
78 old_rep->allocated_size * sizeof(rep_->elements[0]));
79 rep_->allocated_size = old_rep->allocated_size;
80 } else {
81 rep_->allocated_size = 0;
82 }
83 if (arena == NULL) {
84 #if defined(__GXX_DELETE_WITH_SIZE__) || defined(__cpp_sized_deallocation)
85 const size_t old_size =
86 old_total_size * sizeof(rep_->elements[0]) + kRepHeaderSize;
87 ::operator delete(static_cast<void*>(old_rep), old_size);
88 #else
89 ::operator delete(static_cast<void*>(old_rep));
90 #endif
91 }
92 return &rep_->elements[current_size_];
93 }
94
Reserve(int new_size)95 void RepeatedPtrFieldBase::Reserve(int new_size) {
96 if (new_size > current_size_) {
97 InternalExtend(new_size - current_size_);
98 }
99 }
100
AddOutOfLineHelper(void * obj)101 void* RepeatedPtrFieldBase::AddOutOfLineHelper(void* obj) {
102 if (!rep_ || rep_->allocated_size == total_size_) {
103 InternalExtend(1); // Equivalent to "Reserve(total_size_ + 1)"
104 }
105 ++rep_->allocated_size;
106 rep_->elements[current_size_++] = obj;
107 return obj;
108 }
109
CloseGap(int start,int num)110 void RepeatedPtrFieldBase::CloseGap(int start, int num) {
111 if (rep_ == NULL) return;
112 // Close up a gap of "num" elements starting at offset "start".
113 for (int i = start + num; i < rep_->allocated_size; ++i)
114 rep_->elements[i - num] = rep_->elements[i];
115 current_size_ -= num;
116 rep_->allocated_size -= num;
117 }
118
AddWeak(const MessageLite * prototype)119 MessageLite* RepeatedPtrFieldBase::AddWeak(const MessageLite* prototype) {
120 if (rep_ != NULL && current_size_ < rep_->allocated_size) {
121 return reinterpret_cast<MessageLite*>(rep_->elements[current_size_++]);
122 }
123 if (!rep_ || rep_->allocated_size == total_size_) {
124 Reserve(total_size_ + 1);
125 }
126 ++rep_->allocated_size;
127 MessageLite* result = prototype
128 ? prototype->New(arena_)
129 : Arena::CreateMessage<ImplicitWeakMessage>(arena_);
130 rep_->elements[current_size_++] = result;
131 return result;
132 }
133
134 } // namespace internal
135
136
137 template class PROTOBUF_EXPORT_TEMPLATE_DEFINE RepeatedField<bool>;
138 template class PROTOBUF_EXPORT_TEMPLATE_DEFINE RepeatedField<int32>;
139 template class PROTOBUF_EXPORT_TEMPLATE_DEFINE RepeatedField<uint32>;
140 template class PROTOBUF_EXPORT_TEMPLATE_DEFINE RepeatedField<int64>;
141 template class PROTOBUF_EXPORT_TEMPLATE_DEFINE RepeatedField<uint64>;
142 template class PROTOBUF_EXPORT_TEMPLATE_DEFINE RepeatedField<float>;
143 template class PROTOBUF_EXPORT_TEMPLATE_DEFINE RepeatedField<double>;
144 template class PROTOBUF_EXPORT_TEMPLATE_DEFINE RepeatedPtrField<std::string>;
145
146 } // namespace protobuf
147 } // namespace google
148
149 #include <google/protobuf/port_undef.inc>
150