Line data Source code
1 : // Copyright 2014 the V8 project authors. All rights reserved.
2 : // Redistribution and use in source and binary forms, with or without
3 : // modification, are permitted provided that the following conditions are
4 : // met:
5 : //
6 : // * Redistributions of source code must retain the above copyright
7 : // notice, this list of conditions and the following disclaimer.
8 : // * Redistributions in binary form must reproduce the above
9 : // copyright notice, this list of conditions and the following
10 : // disclaimer in the documentation and/or other materials provided
11 : // with the distribution.
12 : // * Neither the name of Google Inc. nor the names of its
13 : // contributors may be used to endorse or promote products derived
14 : // from this software without specific prior written permission.
15 : //
16 : // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 : // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 : // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 : // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 : // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 : // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 : // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 : // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 : // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 : // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 : // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 :
28 : #include "src/ast/ast-value-factory.h"
29 :
30 : #include "src/char-predicates-inl.h"
31 : #include "src/objects-inl.h"
32 : #include "src/objects.h"
33 : #include "src/string-hasher.h"
34 : #include "src/utils-inl.h"
35 :
36 : namespace v8 {
37 : namespace internal {
38 :
39 : namespace {
40 :
41 : // For using StringToArrayIndex.
42 : class OneByteStringStream {
43 : public:
44 : explicit OneByteStringStream(Vector<const byte> lb) :
45 156 : literal_bytes_(lb), pos_(0) {}
46 :
47 1550 : bool HasMore() { return pos_ < literal_bytes_.length(); }
48 3100 : uint16_t GetNext() { return literal_bytes_[pos_++]; }
49 :
50 : private:
51 : Vector<const byte> literal_bytes_;
52 : int pos_;
53 : };
54 :
55 : } // namespace
56 :
57 0 : class AstRawStringInternalizationKey : public StringTableKey {
58 : public:
59 27927967 : explicit AstRawStringInternalizationKey(const AstRawString* string)
60 27927967 : : StringTableKey(string->hash_field()), string_(string) {}
61 :
62 76328084 : bool IsMatch(Object other) override {
63 76328084 : if (string_->is_one_byte())
64 76253615 : return String::cast(other)->IsOneByteEqualTo(string_->literal_bytes_);
65 : return String::cast(other)->IsTwoByteEqualTo(
66 74479 : Vector<const uint16_t>::cast(string_->literal_bytes_));
67 : }
68 :
69 8654582 : Handle<String> AsHandle(Isolate* isolate) override {
70 8707613 : if (string_->is_one_byte())
71 : return isolate->factory()->NewOneByteInternalizedString(
72 8601551 : string_->literal_bytes_, string_->hash_field());
73 : return isolate->factory()->NewTwoByteInternalizedString(
74 : Vector<const uint16_t>::cast(string_->literal_bytes_),
75 53031 : string_->hash_field());
76 : }
77 :
78 : private:
79 : const AstRawString* string_;
80 : };
81 :
82 27927967 : void AstRawString::Internalize(Isolate* isolate) {
83 : DCHECK(!has_string_);
84 55855934 : if (literal_bytes_.length() == 0) {
85 : set_string(isolate->factory()->empty_string());
86 : } else {
87 : AstRawStringInternalizationKey key(this);
88 27927967 : set_string(StringTable::LookupKey(isolate, &key));
89 : }
90 27927990 : }
91 :
92 11398942 : bool AstRawString::AsArrayIndex(uint32_t* index) const {
93 : // The StringHasher will set up the hash in such a way that we can use it to
94 : // figure out whether the string is convertible to an array index.
95 11398942 : if ((hash_field_ & Name::kIsNotArrayIndexMask) != 0) return false;
96 4416 : if (length() <= Name::kMaxCachedArrayIndexLength) {
97 4260 : *index = Name::ArrayIndexValueBits::decode(hash_field_);
98 : } else {
99 : OneByteStringStream stream(literal_bytes_);
100 156 : CHECK(StringToArrayIndex(&stream, index));
101 : }
102 : return true;
103 : }
104 :
105 181053 : bool AstRawString::IsOneByteEqualTo(const char* data) const {
106 181053 : if (!is_one_byte()) return false;
107 :
108 393138 : size_t length = static_cast<size_t>(literal_bytes_.length());
109 181066 : if (length != strlen(data)) return false;
110 :
111 : return 0 == strncmp(reinterpret_cast<const char*>(literal_bytes_.start()),
112 31006 : data, length);
113 : }
114 :
115 4168143 : uint16_t AstRawString::FirstCharacter() const {
116 4168143 : if (is_one_byte()) return literal_bytes_[0];
117 : const uint16_t* c = reinterpret_cast<const uint16_t*>(literal_bytes_.start());
118 18 : return *c;
119 : }
120 :
121 53438524 : bool AstRawString::Compare(void* a, void* b) {
122 : const AstRawString* lhs = static_cast<AstRawString*>(a);
123 : const AstRawString* rhs = static_cast<AstRawString*>(b);
124 : DCHECK_EQ(lhs->Hash(), rhs->Hash());
125 :
126 53438524 : if (lhs->length() != rhs->length()) return false;
127 : const unsigned char* l = lhs->raw_data();
128 : const unsigned char* r = rhs->raw_data();
129 53440515 : size_t length = rhs->length();
130 53440515 : if (lhs->is_one_byte()) {
131 53432763 : if (rhs->is_one_byte()) {
132 : return CompareCharsUnsigned(reinterpret_cast<const uint8_t*>(l),
133 : reinterpret_cast<const uint8_t*>(r),
134 53432757 : length) == 0;
135 : } else {
136 : return CompareCharsUnsigned(reinterpret_cast<const uint8_t*>(l),
137 : reinterpret_cast<const uint16_t*>(r),
138 6 : length) == 0;
139 : }
140 : } else {
141 7752 : if (rhs->is_one_byte()) {
142 : return CompareCharsUnsigned(reinterpret_cast<const uint16_t*>(l),
143 : reinterpret_cast<const uint8_t*>(r),
144 0 : length) == 0;
145 : } else {
146 : return CompareCharsUnsigned(reinterpret_cast<const uint16_t*>(l),
147 : reinterpret_cast<const uint16_t*>(r),
148 7752 : length) == 0;
149 : }
150 : }
151 : }
152 :
153 8470449 : void AstConsString::Internalize(Isolate* isolate) {
154 8470449 : if (IsEmpty()) {
155 : set_string(isolate->factory()->empty_string());
156 8470449 : return;
157 : }
158 : // AstRawStrings are internalized before AstConsStrings, so
159 : // AstRawString::string() will just work.
160 3401751 : Handle<String> tmp(segment_.string->string());
161 3725607 : for (AstConsString::Segment* current = segment_.next; current != nullptr;
162 : current = current->next) {
163 : tmp = isolate->factory()
164 323856 : ->NewConsString(current->string->string(), tmp)
165 647712 : .ToHandleChecked();
166 : }
167 : set_string(tmp);
168 : }
169 :
170 42 : std::forward_list<const AstRawString*> AstConsString::ToRawStrings() const {
171 : std::forward_list<const AstRawString*> result;
172 21 : if (IsEmpty()) {
173 : return result;
174 : }
175 :
176 21 : result.emplace_front(segment_.string);
177 21 : for (AstConsString::Segment* current = segment_.next; current != nullptr;
178 : current = current->next) {
179 0 : result.emplace_front(current->string);
180 : }
181 : return result;
182 : }
183 :
184 62883 : AstStringConstants::AstStringConstants(Isolate* isolate, uint64_t hash_seed)
185 : : zone_(isolate->allocator(), ZONE_NAME),
186 : string_table_(AstRawString::Compare),
187 125766 : hash_seed_(hash_seed) {
188 : DCHECK(ThreadId::Current().Equals(isolate->thread_id()));
189 : #define F(name, str) \
190 : { \
191 : const char* data = str; \
192 : Vector<const uint8_t> literal(reinterpret_cast<const uint8_t*>(data), \
193 : static_cast<int>(strlen(data))); \
194 : uint32_t hash_field = StringHasher::HashSequentialString<uint8_t>( \
195 : literal.start(), literal.length(), hash_seed_); \
196 : name##_string_ = new (&zone_) AstRawString(true, literal, hash_field); \
197 : /* The Handle returned by the factory is located on the roots */ \
198 : /* array, not on the temporary HandleScope, so this is safe. */ \
199 : name##_string_->set_string(isolate->factory()->name##_string()); \
200 : base::HashMap::Entry* entry = \
201 : string_table_.InsertNew(name##_string_, name##_string_->Hash()); \
202 : DCHECK_NULL(entry->value); \
203 : entry->value = reinterpret_cast<void*>(1); \
204 : }
205 9495315 : AST_STRING_CONSTANTS(F)
206 : #undef F
207 62883 : }
208 :
209 99785141 : AstRawString* AstValueFactory::GetOneByteStringInternal(
210 : Vector<const uint8_t> literal) {
211 99785141 : if (literal.length() == 1 && literal[0] < kMaxOneCharStringValue) {
212 20999332 : int key = literal[0];
213 20999332 : if (V8_UNLIKELY(one_character_strings_[key] == nullptr)) {
214 : uint32_t hash_field = StringHasher::HashSequentialString<uint8_t>(
215 3775644 : literal.start(), literal.length(), hash_seed_);
216 3775645 : one_character_strings_[key] = GetString(hash_field, true, literal);
217 : }
218 20999317 : return one_character_strings_[key];
219 : }
220 : uint32_t hash_field = StringHasher::HashSequentialString<uint8_t>(
221 78785809 : literal.start(), literal.length(), hash_seed_);
222 78808016 : return GetString(hash_field, true, literal);
223 : }
224 :
225 77477 : AstRawString* AstValueFactory::GetTwoByteStringInternal(
226 : Vector<const uint16_t> literal) {
227 : uint32_t hash_field = StringHasher::HashSequentialString<uint16_t>(
228 154954 : literal.start(), literal.length(), hash_seed_);
229 77477 : return GetString(hash_field, false, Vector<const byte>::cast(literal));
230 : }
231 :
232 732279 : const AstRawString* AstValueFactory::GetString(Handle<String> literal) {
233 : AstRawString* result = nullptr;
234 : DisallowHeapAllocation no_gc;
235 732279 : String::FlatContent content = literal->GetFlatContent(no_gc);
236 732281 : if (content.IsOneByte()) {
237 732264 : result = GetOneByteStringInternal(content.ToOneByteVector());
238 : } else {
239 : DCHECK(content.IsTwoByte());
240 17 : result = GetTwoByteStringInternal(content.ToUC16Vector());
241 : }
242 732275 : return result;
243 : }
244 :
245 80 : const AstRawString* AstValueFactory::CloneFromOtherFactory(
246 160 : const AstRawString* raw_string) {
247 : const AstRawString* result = GetString(
248 : raw_string->hash_field(), raw_string->is_one_byte(),
249 240 : Vector<const byte>(raw_string->raw_data(), raw_string->byte_length()));
250 80 : return result;
251 : }
252 :
253 10273532 : AstConsString* AstValueFactory::NewConsString() {
254 10273532 : AstConsString* new_string = new (zone_) AstConsString;
255 : DCHECK_NOT_NULL(new_string);
256 : AddConsString(new_string);
257 10273612 : return new_string;
258 : }
259 :
260 6829878 : AstConsString* AstValueFactory::NewConsString(const AstRawString* str) {
261 6829878 : return NewConsString()->AddString(zone_, str);
262 : }
263 :
264 27168 : AstConsString* AstValueFactory::NewConsString(const AstRawString* str1,
265 : const AstRawString* str2) {
266 27168 : return NewConsString()->AddString(zone_, str1)->AddString(zone_, str2);
267 : }
268 :
269 3784904 : void AstValueFactory::Internalize(Isolate* isolate) {
270 : // Strings need to be internalized before values, because values refer to
271 : // strings.
272 35497804 : for (AstRawString* current = strings_; current != nullptr;) {
273 : AstRawString* next = current->next();
274 27927965 : current->Internalize(isolate);
275 : current = next;
276 : }
277 :
278 : // AstConsStrings refer to AstRawStrings.
279 16040321 : for (AstConsString* current = cons_strings_; current != nullptr;) {
280 : AstConsString* next = current->next();
281 8470451 : current->Internalize(isolate);
282 : current = next;
283 : }
284 :
285 : ResetStrings();
286 3784935 : }
287 :
288 82680882 : AstRawString* AstValueFactory::GetString(uint32_t hash_field, bool is_one_byte,
289 : Vector<const byte> literal_bytes) {
290 : // literal_bytes here points to whatever the user passed, and this is OK
291 : // because we use vector_compare (which checks the contents) to compare
292 : // against the AstRawStrings which are in the string_table_. We should not
293 : // return this AstRawString.
294 : AstRawString key(is_one_byte, literal_bytes, hash_field);
295 165363833 : base::HashMap::Entry* entry = string_table_.LookupOrInsert(&key, key.Hash());
296 82682951 : if (entry->value == nullptr) {
297 : // Copy literal contents for later comparison.
298 31716644 : int length = literal_bytes.length();
299 31716644 : byte* new_literal_bytes = zone_->NewArray<byte>(length);
300 31716216 : memcpy(new_literal_bytes, literal_bytes.start(), length);
301 : AstRawString* new_string = new (zone_) AstRawString(
302 31716216 : is_one_byte, Vector<const byte>(new_literal_bytes, length), hash_field);
303 31713756 : CHECK_NOT_NULL(new_string);
304 : AddString(new_string);
305 31713756 : entry->key = new_string;
306 31713756 : entry->value = reinterpret_cast<void*>(1);
307 : }
308 82680063 : return reinterpret_cast<AstRawString*>(entry->key);
309 : }
310 :
311 : } // namespace internal
312 183867 : } // namespace v8
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