Line data Source code
1 : // Copyright 2012 the V8 project authors. All rights reserved.
2 : // Use of this source code is governed by a BSD-style license that can be
3 : // found in the LICENSE file.
4 :
5 : #include "src/regexp/regexp-macro-assembler.h"
6 :
7 : #include "src/assembler.h"
8 : #include "src/isolate-inl.h"
9 : #include "src/regexp/regexp-stack.h"
10 : #include "src/simulator.h"
11 : #include "src/unicode-inl.h"
12 :
13 : #ifdef V8_INTL_SUPPORT
14 : #include "unicode/uchar.h"
15 : #endif // V8_INTL_SUPPORT
16 :
17 : namespace v8 {
18 : namespace internal {
19 :
20 0 : RegExpMacroAssembler::RegExpMacroAssembler(Isolate* isolate, Zone* zone)
21 : : slow_safe_compiler_(false),
22 : global_mode_(NOT_GLOBAL),
23 : isolate_(isolate),
24 85333 : zone_(zone) {}
25 :
26 : RegExpMacroAssembler::~RegExpMacroAssembler() = default;
27 :
28 416053 : int RegExpMacroAssembler::CaseInsensitiveCompareUC16(Address byte_offset1,
29 : Address byte_offset2,
30 : size_t byte_length,
31 : Isolate* isolate) {
32 : // This function is not allowed to cause a garbage collection.
33 : // A GC might move the calling generated code and invalidate the
34 : // return address on the stack.
35 : DCHECK_EQ(0, byte_length % 2);
36 416053 : uc16* substring1 = reinterpret_cast<uc16*>(byte_offset1);
37 416053 : uc16* substring2 = reinterpret_cast<uc16*>(byte_offset2);
38 416053 : size_t length = byte_length >> 1;
39 :
40 : #ifdef V8_INTL_SUPPORT
41 416053 : if (isolate == nullptr) {
42 35 : for (size_t i = 0; i < length; i++) {
43 35 : uc32 c1 = substring1[i];
44 35 : uc32 c2 = substring2[i];
45 35 : if (unibrow::Utf16::IsLeadSurrogate(c1)) {
46 : // Non-BMP characters do not have case-equivalents in the BMP.
47 : // Both have to be non-BMP for them to be able to match.
48 9 : if (!unibrow::Utf16::IsLeadSurrogate(c2)) return 0;
49 9 : if (i + 1 < length) {
50 9 : uc16 c1t = substring1[i + 1];
51 9 : uc16 c2t = substring2[i + 1];
52 18 : if (unibrow::Utf16::IsTrailSurrogate(c1t) &&
53 : unibrow::Utf16::IsTrailSurrogate(c2t)) {
54 : c1 = unibrow::Utf16::CombineSurrogatePair(c1, c1t);
55 : c2 = unibrow::Utf16::CombineSurrogatePair(c2, c2t);
56 : i++;
57 : }
58 : }
59 : }
60 35 : c1 = u_foldCase(c1, U_FOLD_CASE_DEFAULT);
61 35 : c2 = u_foldCase(c2, U_FOLD_CASE_DEFAULT);
62 35 : if (c1 != c2) return 0;
63 : }
64 : return 1;
65 : }
66 : #endif // V8_INTL_SUPPORT
67 : DCHECK_NOT_NULL(isolate);
68 : unibrow::Mapping<unibrow::Ecma262Canonicalize>* canonicalize =
69 416018 : isolate->regexp_macro_assembler_canonicalize();
70 440542 : for (size_t i = 0; i < length; i++) {
71 416090 : unibrow::uchar c1 = substring1[i];
72 416090 : unibrow::uchar c2 = substring2[i];
73 416090 : if (c1 != c2) {
74 391687 : unibrow::uchar s1[1] = {c1};
75 391687 : canonicalize->get(c1, '\0', s1);
76 391687 : if (s1[0] != c2) {
77 391660 : unibrow::uchar s2[1] = {c2};
78 391660 : canonicalize->get(c2, '\0', s2);
79 391660 : if (s1[0] != s2[0]) {
80 391566 : return 0;
81 : }
82 : }
83 : }
84 : }
85 : return 1;
86 : }
87 :
88 :
89 85 : void RegExpMacroAssembler::CheckNotInSurrogatePair(int cp_offset,
90 : Label* on_failure) {
91 85 : Label ok;
92 : // Check that current character is not a trail surrogate.
93 85 : LoadCurrentCharacter(cp_offset, &ok);
94 85 : CheckCharacterNotInRange(kTrailSurrogateStart, kTrailSurrogateEnd, &ok);
95 : // Check that previous character is not a lead surrogate.
96 85 : LoadCurrentCharacter(cp_offset - 1, &ok);
97 85 : CheckCharacterInRange(kLeadSurrogateStart, kLeadSurrogateEnd, on_failure);
98 85 : Bind(&ok);
99 85 : }
100 :
101 0 : void RegExpMacroAssembler::CheckPosition(int cp_offset,
102 : Label* on_outside_input) {
103 0 : LoadCurrentCharacter(cp_offset, on_outside_input, true);
104 0 : }
105 :
106 0 : bool RegExpMacroAssembler::CheckSpecialCharacterClass(uc16 type,
107 : Label* on_no_match) {
108 0 : return false;
109 : }
110 :
111 : #ifndef V8_INTERPRETED_REGEXP // Avoid unused code, e.g., on ARM.
112 :
113 85333 : NativeRegExpMacroAssembler::NativeRegExpMacroAssembler(Isolate* isolate,
114 : Zone* zone)
115 85333 : : RegExpMacroAssembler(isolate, zone) {}
116 :
117 : NativeRegExpMacroAssembler::~NativeRegExpMacroAssembler() = default;
118 :
119 213650 : bool NativeRegExpMacroAssembler::CanReadUnaligned() {
120 213650 : return FLAG_enable_regexp_unaligned_accesses && !slow_safe();
121 : }
122 :
123 118258 : const byte* NativeRegExpMacroAssembler::StringCharacterPosition(
124 : String subject, int start_index, const DisallowHeapAllocation& no_gc) {
125 118258 : if (subject->IsConsString()) {
126 0 : subject = ConsString::cast(subject)->first();
127 118258 : } else if (subject->IsSlicedString()) {
128 2 : start_index += SlicedString::cast(subject)->offset();
129 2 : subject = SlicedString::cast(subject)->parent();
130 : }
131 118258 : if (subject->IsThinString()) {
132 0 : subject = ThinString::cast(subject)->actual();
133 : }
134 : DCHECK_LE(0, start_index);
135 : DCHECK_LE(start_index, subject->length());
136 118258 : if (subject->IsSeqOneByteString()) {
137 : return reinterpret_cast<const byte*>(
138 46941 : SeqOneByteString::cast(subject)->GetChars(no_gc) + start_index);
139 71317 : } else if (subject->IsSeqTwoByteString()) {
140 : return reinterpret_cast<const byte*>(
141 71249 : SeqTwoByteString::cast(subject)->GetChars(no_gc) + start_index);
142 68 : } else if (subject->IsExternalOneByteString()) {
143 : return reinterpret_cast<const byte*>(
144 23 : ExternalOneByteString::cast(subject)->GetChars() + start_index);
145 : } else {
146 : DCHECK(subject->IsExternalTwoByteString());
147 : return reinterpret_cast<const byte*>(
148 45 : ExternalTwoByteString::cast(subject)->GetChars() + start_index);
149 : }
150 : }
151 :
152 400 : int NativeRegExpMacroAssembler::CheckStackGuardState(
153 : Isolate* isolate, int start_index, bool is_direct_call,
154 : Address* return_address, Code re_code, Address* subject,
155 : const byte** input_start, const byte** input_end) {
156 : AllowHeapAllocation allow_allocation;
157 : DCHECK(re_code->raw_instruction_start() <= *return_address);
158 : DCHECK(*return_address <= re_code->raw_instruction_end());
159 : int return_value = 0;
160 : // Prepare for possible GC.
161 : HandleScope handles(isolate);
162 : Handle<Code> code_handle(re_code, isolate);
163 400 : Handle<String> subject_handle(String::cast(Object(*subject)), isolate);
164 400 : bool is_one_byte = String::IsOneByteRepresentationUnderneath(*subject_handle);
165 :
166 : StackLimitCheck check(isolate);
167 400 : bool js_has_overflowed = check.JsHasOverflowed();
168 :
169 400 : if (is_direct_call) {
170 : // Direct calls from JavaScript can be interrupted in two ways:
171 : // 1. A real stack overflow, in which case we let the caller throw the
172 : // exception.
173 : // 2. The stack guard was used to interrupt execution for another purpose,
174 : // forcing the call through the runtime system.
175 141 : return_value = js_has_overflowed ? EXCEPTION : RETRY;
176 259 : } else if (js_has_overflowed) {
177 90 : isolate->StackOverflow();
178 : return_value = EXCEPTION;
179 : } else {
180 169 : Object result = isolate->stack_guard()->HandleInterrupts();
181 169 : if (result->IsException(isolate)) return_value = EXCEPTION;
182 : }
183 :
184 : DisallowHeapAllocation no_gc;
185 :
186 400 : if (*code_handle != re_code) { // Return address no longer valid
187 0 : intptr_t delta = code_handle->address() - re_code->address();
188 : // Overwrite the return address on the stack.
189 0 : *return_address += delta;
190 : }
191 :
192 : // If we continue, we need to update the subject string addresses.
193 400 : if (return_value == 0) {
194 : // String encoding might have changed.
195 159 : if (String::IsOneByteRepresentationUnderneath(*subject_handle) !=
196 : is_one_byte) {
197 : // If we changed between an LATIN1 and an UC16 string, the specialized
198 : // code cannot be used, and we need to restart regexp matching from
199 : // scratch (including, potentially, compiling a new version of the code).
200 : return_value = RETRY;
201 : } else {
202 159 : *subject = subject_handle->ptr();
203 159 : intptr_t byte_length = *input_end - *input_start;
204 : *input_start =
205 159 : StringCharacterPosition(*subject_handle, start_index, no_gc);
206 159 : *input_end = *input_start + byte_length;
207 : }
208 : }
209 400 : return return_value;
210 : }
211 :
212 118099 : NativeRegExpMacroAssembler::Result NativeRegExpMacroAssembler::Match(
213 : Handle<Code> regexp_code,
214 : Handle<String> subject,
215 : int* offsets_vector,
216 : int offsets_vector_length,
217 : int previous_index,
218 : Isolate* isolate) {
219 :
220 : DCHECK(subject->IsFlat());
221 : DCHECK_LE(0, previous_index);
222 : DCHECK_LE(previous_index, subject->length());
223 :
224 : // No allocations before calling the regexp, but we can't use
225 : // DisallowHeapAllocation, since regexps might be preempted, and another
226 : // thread might do allocation anyway.
227 :
228 118099 : String subject_ptr = *subject;
229 : // Character offsets into string.
230 : int start_offset = previous_index;
231 118099 : int char_length = subject_ptr->length() - start_offset;
232 : int slice_offset = 0;
233 :
234 : // The string has been flattened, so if it is a cons string it contains the
235 : // full string in the first part.
236 118099 : if (StringShape(subject_ptr).IsCons()) {
237 : DCHECK_EQ(0, ConsString::cast(subject_ptr)->second()->length());
238 0 : subject_ptr = ConsString::cast(subject_ptr)->first();
239 118099 : } else if (StringShape(subject_ptr).IsSliced()) {
240 754 : SlicedString slice = SlicedString::cast(subject_ptr);
241 754 : subject_ptr = slice->parent();
242 : slice_offset = slice->offset();
243 : }
244 118099 : if (StringShape(subject_ptr).IsThin()) {
245 5 : subject_ptr = ThinString::cast(subject_ptr)->actual();
246 : }
247 : // Ensure that an underlying string has the same representation.
248 118099 : bool is_one_byte = subject_ptr->IsOneByteRepresentation();
249 : DCHECK(subject_ptr->IsExternalString() || subject_ptr->IsSeqString());
250 : // String is now either Sequential or External
251 118099 : int char_size_shift = is_one_byte ? 0 : 1;
252 :
253 : DisallowHeapAllocation no_gc;
254 : const byte* input_start =
255 118099 : StringCharacterPosition(subject_ptr, start_offset + slice_offset, no_gc);
256 118099 : int byte_length = char_length << char_size_shift;
257 118099 : const byte* input_end = input_start + byte_length;
258 : Result res = Execute(*regexp_code,
259 : *subject,
260 : start_offset,
261 : input_start,
262 : input_end,
263 : offsets_vector,
264 : offsets_vector_length,
265 118099 : isolate);
266 118099 : return res;
267 : }
268 :
269 118169 : NativeRegExpMacroAssembler::Result NativeRegExpMacroAssembler::Execute(
270 : Code code,
271 : String input, // This needs to be the unpacked (sliced, cons) string.
272 : int start_offset, const byte* input_start, const byte* input_end,
273 : int* output, int output_size, Isolate* isolate) {
274 : // Ensure that the minimum stack has been allocated.
275 118169 : RegExpStackScope stack_scope(isolate);
276 118169 : Address stack_base = stack_scope.stack()->stack_base();
277 :
278 : int direct_call = 0;
279 :
280 : using RegexpMatcherSig = int(
281 : Address input_string, int start_offset, // NOLINT(readability/casting)
282 : const byte* input_start, const byte* input_end, int* output,
283 : int output_size, Address stack_base, int direct_call, Isolate* isolate);
284 :
285 : auto fn = GeneratedCode<RegexpMatcherSig>::FromCode(code);
286 : int result = fn.Call(input.ptr(), start_offset, input_start, input_end,
287 : output, output_size, stack_base, direct_call, isolate);
288 : DCHECK(result >= RETRY);
289 :
290 118169 : if (result == EXCEPTION && !isolate->has_pending_exception()) {
291 : // We detected a stack overflow (on the backtrack stack) in RegExp code,
292 : // but haven't created the exception yet. Additionally, we allow heap
293 : // allocation because even though it invalidates {input_start} and
294 : // {input_end}, we are about to return anyway.
295 : AllowHeapAllocation allow_allocation;
296 6 : isolate->StackOverflow();
297 : }
298 118169 : return static_cast<Result>(result);
299 : }
300 :
301 : // clang-format off
302 : const byte NativeRegExpMacroAssembler::word_character_map[] = {
303 : 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u,
304 : 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u,
305 : 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u,
306 : 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u,
307 :
308 : 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u,
309 : 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u,
310 : 0xFFu, 0xFFu, 0xFFu, 0xFFu, 0xFFu, 0xFFu, 0xFFu, 0xFFu, // '0' - '7'
311 : 0xFFu, 0xFFu, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, // '8' - '9'
312 :
313 : 0x00u, 0xFFu, 0xFFu, 0xFFu, 0xFFu, 0xFFu, 0xFFu, 0xFFu, // 'A' - 'G'
314 : 0xFFu, 0xFFu, 0xFFu, 0xFFu, 0xFFu, 0xFFu, 0xFFu, 0xFFu, // 'H' - 'O'
315 : 0xFFu, 0xFFu, 0xFFu, 0xFFu, 0xFFu, 0xFFu, 0xFFu, 0xFFu, // 'P' - 'W'
316 : 0xFFu, 0xFFu, 0xFFu, 0x00u, 0x00u, 0x00u, 0x00u, 0xFFu, // 'X' - 'Z', '_'
317 :
318 : 0x00u, 0xFFu, 0xFFu, 0xFFu, 0xFFu, 0xFFu, 0xFFu, 0xFFu, // 'a' - 'g'
319 : 0xFFu, 0xFFu, 0xFFu, 0xFFu, 0xFFu, 0xFFu, 0xFFu, 0xFFu, // 'h' - 'o'
320 : 0xFFu, 0xFFu, 0xFFu, 0xFFu, 0xFFu, 0xFFu, 0xFFu, 0xFFu, // 'p' - 'w'
321 : 0xFFu, 0xFFu, 0xFFu, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, // 'x' - 'z'
322 : // Latin-1 range
323 : 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u,
324 : 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u,
325 : 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u,
326 : 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u,
327 :
328 : 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u,
329 : 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u,
330 : 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u,
331 : 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u,
332 :
333 : 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u,
334 : 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u,
335 : 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u,
336 : 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u,
337 :
338 : 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u,
339 : 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u,
340 : 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u,
341 : 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u, 0x00u,
342 : };
343 : // clang-format on
344 :
345 329 : Address NativeRegExpMacroAssembler::GrowStack(Address stack_pointer,
346 : Address* stack_base,
347 329 : Isolate* isolate) {
348 329 : RegExpStack* regexp_stack = isolate->regexp_stack();
349 : size_t size = regexp_stack->stack_capacity();
350 : Address old_stack_base = regexp_stack->stack_base();
351 : DCHECK(old_stack_base == *stack_base);
352 : DCHECK(stack_pointer <= old_stack_base);
353 : DCHECK(static_cast<size_t>(old_stack_base - stack_pointer) <= size);
354 329 : Address new_stack_base = regexp_stack->EnsureCapacity(size * 2);
355 329 : if (new_stack_base == kNullAddress) {
356 : return kNullAddress;
357 : }
358 324 : *stack_base = new_stack_base;
359 324 : intptr_t stack_content_size = old_stack_base - stack_pointer;
360 324 : return new_stack_base - stack_content_size;
361 : }
362 :
363 : #endif // V8_INTERPRETED_REGEXP
364 :
365 : } // namespace internal
366 183867 : } // namespace v8
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