Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 1 | // Copyright 2013 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/v8.h" |
| 6 | |
| 7 | #if V8_TARGET_ARCH_ARM64 |
| 8 | |
| 9 | #include "src/code-stubs.h" |
| 10 | #include "src/cpu-profiler.h" |
| 11 | #include "src/log.h" |
| 12 | #include "src/macro-assembler.h" |
| 13 | #include "src/regexp-macro-assembler.h" |
| 14 | #include "src/regexp-stack.h" |
| 15 | #include "src/unicode.h" |
| 16 | |
| 17 | #include "src/arm64/regexp-macro-assembler-arm64.h" |
| 18 | |
| 19 | namespace v8 { |
| 20 | namespace internal { |
| 21 | |
| 22 | #ifndef V8_INTERPRETED_REGEXP |
| 23 | /* |
| 24 | * This assembler uses the following register assignment convention: |
| 25 | * - w19 : Used to temporarely store a value before a call to C code. |
| 26 | * See CheckNotBackReferenceIgnoreCase. |
| 27 | * - x20 : Pointer to the current code object (Code*), |
| 28 | * it includes the heap object tag. |
| 29 | * - w21 : Current position in input, as negative offset from |
| 30 | * the end of the string. Please notice that this is |
| 31 | * the byte offset, not the character offset! |
| 32 | * - w22 : Currently loaded character. Must be loaded using |
| 33 | * LoadCurrentCharacter before using any of the dispatch methods. |
| 34 | * - x23 : Points to tip of backtrack stack. |
| 35 | * - w24 : Position of the first character minus one: non_position_value. |
| 36 | * Used to initialize capture registers. |
| 37 | * - x25 : Address at the end of the input string: input_end. |
| 38 | * Points to byte after last character in input. |
| 39 | * - x26 : Address at the start of the input string: input_start. |
| 40 | * - w27 : Where to start in the input string. |
| 41 | * - x28 : Output array pointer. |
| 42 | * - x29/fp : Frame pointer. Used to access arguments, local variables and |
| 43 | * RegExp registers. |
| 44 | * - x16/x17 : IP registers, used by assembler. Very volatile. |
| 45 | * - csp : Points to tip of C stack. |
| 46 | * |
| 47 | * - x0-x7 : Used as a cache to store 32 bit capture registers. These |
| 48 | * registers need to be retained every time a call to C code |
| 49 | * is done. |
| 50 | * |
| 51 | * The remaining registers are free for computations. |
| 52 | * Each call to a public method should retain this convention. |
| 53 | * |
| 54 | * The stack will have the following structure: |
| 55 | * |
| 56 | * Location Name Description |
| 57 | * (as referred to in |
| 58 | * the code) |
| 59 | * |
| 60 | * - fp[104] isolate Address of the current isolate. |
| 61 | * - fp[96] return_address Secondary link/return address |
| 62 | * used by an exit frame if this is a |
| 63 | * native call. |
| 64 | * ^^^ csp when called ^^^ |
| 65 | * - fp[88] lr Return from the RegExp code. |
| 66 | * - fp[80] r29 Old frame pointer (CalleeSaved). |
| 67 | * - fp[0..72] r19-r28 Backup of CalleeSaved registers. |
| 68 | * - fp[-8] direct_call 1 => Direct call from JavaScript code. |
| 69 | * 0 => Call through the runtime system. |
| 70 | * - fp[-16] stack_base High end of the memory area to use as |
| 71 | * the backtracking stack. |
| 72 | * - fp[-24] output_size Output may fit multiple sets of matches. |
| 73 | * - fp[-32] input Handle containing the input string. |
| 74 | * - fp[-40] success_counter |
| 75 | * ^^^^^^^^^^^^^ From here and downwards we store 32 bit values ^^^^^^^^^^^^^ |
| 76 | * - fp[-44] register N Capture registers initialized with |
| 77 | * - fp[-48] register N + 1 non_position_value. |
| 78 | * ... The first kNumCachedRegisters (N) registers |
| 79 | * ... are cached in x0 to x7. |
| 80 | * ... Only positions must be stored in the first |
| 81 | * - ... num_saved_registers_ registers. |
| 82 | * - ... |
| 83 | * - register N + num_registers - 1 |
| 84 | * ^^^^^^^^^ csp ^^^^^^^^^ |
| 85 | * |
| 86 | * The first num_saved_registers_ registers are initialized to point to |
| 87 | * "character -1" in the string (i.e., char_size() bytes before the first |
| 88 | * character of the string). The remaining registers start out as garbage. |
| 89 | * |
| 90 | * The data up to the return address must be placed there by the calling |
| 91 | * code and the remaining arguments are passed in registers, e.g. by calling the |
| 92 | * code entry as cast to a function with the signature: |
| 93 | * int (*match)(String* input, |
| 94 | * int start_offset, |
| 95 | * Address input_start, |
| 96 | * Address input_end, |
| 97 | * int* output, |
| 98 | * int output_size, |
| 99 | * Address stack_base, |
| 100 | * bool direct_call = false, |
| 101 | * Address secondary_return_address, // Only used by native call. |
| 102 | * Isolate* isolate) |
| 103 | * The call is performed by NativeRegExpMacroAssembler::Execute() |
| 104 | * (in regexp-macro-assembler.cc) via the CALL_GENERATED_REGEXP_CODE macro |
| 105 | * in arm64/simulator-arm64.h. |
| 106 | * When calling as a non-direct call (i.e., from C++ code), the return address |
| 107 | * area is overwritten with the LR register by the RegExp code. When doing a |
| 108 | * direct call from generated code, the return address is placed there by |
| 109 | * the calling code, as in a normal exit frame. |
| 110 | */ |
| 111 | |
| 112 | #define __ ACCESS_MASM(masm_) |
| 113 | |
| 114 | RegExpMacroAssemblerARM64::RegExpMacroAssemblerARM64( |
| 115 | Mode mode, |
| 116 | int registers_to_save, |
| 117 | Zone* zone) |
| 118 | : NativeRegExpMacroAssembler(zone), |
| 119 | masm_(new MacroAssembler(zone->isolate(), NULL, kRegExpCodeSize)), |
| 120 | mode_(mode), |
| 121 | num_registers_(registers_to_save), |
| 122 | num_saved_registers_(registers_to_save), |
| 123 | entry_label_(), |
| 124 | start_label_(), |
| 125 | success_label_(), |
| 126 | backtrack_label_(), |
| 127 | exit_label_() { |
| 128 | __ SetStackPointer(csp); |
| 129 | DCHECK_EQ(0, registers_to_save % 2); |
| 130 | // We can cache at most 16 W registers in x0-x7. |
| 131 | STATIC_ASSERT(kNumCachedRegisters <= 16); |
| 132 | STATIC_ASSERT((kNumCachedRegisters % 2) == 0); |
| 133 | __ B(&entry_label_); // We'll write the entry code later. |
| 134 | __ Bind(&start_label_); // And then continue from here. |
| 135 | } |
| 136 | |
| 137 | |
| 138 | RegExpMacroAssemblerARM64::~RegExpMacroAssemblerARM64() { |
| 139 | delete masm_; |
| 140 | // Unuse labels in case we throw away the assembler without calling GetCode. |
| 141 | entry_label_.Unuse(); |
| 142 | start_label_.Unuse(); |
| 143 | success_label_.Unuse(); |
| 144 | backtrack_label_.Unuse(); |
| 145 | exit_label_.Unuse(); |
| 146 | check_preempt_label_.Unuse(); |
| 147 | stack_overflow_label_.Unuse(); |
| 148 | } |
| 149 | |
| 150 | int RegExpMacroAssemblerARM64::stack_limit_slack() { |
| 151 | return RegExpStack::kStackLimitSlack; |
| 152 | } |
| 153 | |
| 154 | |
| 155 | void RegExpMacroAssemblerARM64::AdvanceCurrentPosition(int by) { |
| 156 | if (by != 0) { |
| 157 | __ Add(current_input_offset(), |
| 158 | current_input_offset(), by * char_size()); |
| 159 | } |
| 160 | } |
| 161 | |
| 162 | |
| 163 | void RegExpMacroAssemblerARM64::AdvanceRegister(int reg, int by) { |
| 164 | DCHECK((reg >= 0) && (reg < num_registers_)); |
| 165 | if (by != 0) { |
| 166 | Register to_advance; |
| 167 | RegisterState register_state = GetRegisterState(reg); |
| 168 | switch (register_state) { |
| 169 | case STACKED: |
| 170 | __ Ldr(w10, register_location(reg)); |
| 171 | __ Add(w10, w10, by); |
| 172 | __ Str(w10, register_location(reg)); |
| 173 | break; |
| 174 | case CACHED_LSW: |
| 175 | to_advance = GetCachedRegister(reg); |
| 176 | __ Add(to_advance, to_advance, by); |
| 177 | break; |
| 178 | case CACHED_MSW: |
| 179 | to_advance = GetCachedRegister(reg); |
| 180 | __ Add(to_advance, to_advance, |
| 181 | static_cast<int64_t>(by) << kWRegSizeInBits); |
| 182 | break; |
| 183 | default: |
| 184 | UNREACHABLE(); |
| 185 | break; |
| 186 | } |
| 187 | } |
| 188 | } |
| 189 | |
| 190 | |
| 191 | void RegExpMacroAssemblerARM64::Backtrack() { |
| 192 | CheckPreemption(); |
| 193 | Pop(w10); |
| 194 | __ Add(x10, code_pointer(), Operand(w10, UXTW)); |
| 195 | __ Br(x10); |
| 196 | } |
| 197 | |
| 198 | |
| 199 | void RegExpMacroAssemblerARM64::Bind(Label* label) { |
| 200 | __ Bind(label); |
| 201 | } |
| 202 | |
| 203 | |
| 204 | void RegExpMacroAssemblerARM64::CheckCharacter(uint32_t c, Label* on_equal) { |
| 205 | CompareAndBranchOrBacktrack(current_character(), c, eq, on_equal); |
| 206 | } |
| 207 | |
| 208 | |
| 209 | void RegExpMacroAssemblerARM64::CheckCharacterGT(uc16 limit, |
| 210 | Label* on_greater) { |
| 211 | CompareAndBranchOrBacktrack(current_character(), limit, hi, on_greater); |
| 212 | } |
| 213 | |
| 214 | |
| 215 | void RegExpMacroAssemblerARM64::CheckAtStart(Label* on_at_start) { |
| 216 | Label not_at_start; |
| 217 | // Did we start the match at the start of the input string? |
| 218 | CompareAndBranchOrBacktrack(start_offset(), 0, ne, ¬_at_start); |
| 219 | // If we did, are we still at the start of the input string? |
| 220 | __ Add(x10, input_end(), Operand(current_input_offset(), SXTW)); |
| 221 | __ Cmp(x10, input_start()); |
| 222 | BranchOrBacktrack(eq, on_at_start); |
| 223 | __ Bind(¬_at_start); |
| 224 | } |
| 225 | |
| 226 | |
| 227 | void RegExpMacroAssemblerARM64::CheckNotAtStart(Label* on_not_at_start) { |
| 228 | // Did we start the match at the start of the input string? |
| 229 | CompareAndBranchOrBacktrack(start_offset(), 0, ne, on_not_at_start); |
| 230 | // If we did, are we still at the start of the input string? |
| 231 | __ Add(x10, input_end(), Operand(current_input_offset(), SXTW)); |
| 232 | __ Cmp(x10, input_start()); |
| 233 | BranchOrBacktrack(ne, on_not_at_start); |
| 234 | } |
| 235 | |
| 236 | |
| 237 | void RegExpMacroAssemblerARM64::CheckCharacterLT(uc16 limit, Label* on_less) { |
| 238 | CompareAndBranchOrBacktrack(current_character(), limit, lo, on_less); |
| 239 | } |
| 240 | |
| 241 | |
| 242 | void RegExpMacroAssemblerARM64::CheckCharacters(Vector<const uc16> str, |
| 243 | int cp_offset, |
| 244 | Label* on_failure, |
| 245 | bool check_end_of_string) { |
| 246 | // This method is only ever called from the cctests. |
| 247 | |
| 248 | if (check_end_of_string) { |
| 249 | // Is last character of required match inside string. |
| 250 | CheckPosition(cp_offset + str.length() - 1, on_failure); |
| 251 | } |
| 252 | |
| 253 | Register characters_address = x11; |
| 254 | |
| 255 | __ Add(characters_address, |
| 256 | input_end(), |
| 257 | Operand(current_input_offset(), SXTW)); |
| 258 | if (cp_offset != 0) { |
| 259 | __ Add(characters_address, characters_address, cp_offset * char_size()); |
| 260 | } |
| 261 | |
| 262 | for (int i = 0; i < str.length(); i++) { |
| 263 | if (mode_ == LATIN1) { |
| 264 | __ Ldrb(w10, MemOperand(characters_address, 1, PostIndex)); |
| 265 | DCHECK(str[i] <= String::kMaxOneByteCharCode); |
| 266 | } else { |
| 267 | __ Ldrh(w10, MemOperand(characters_address, 2, PostIndex)); |
| 268 | } |
| 269 | CompareAndBranchOrBacktrack(w10, str[i], ne, on_failure); |
| 270 | } |
| 271 | } |
| 272 | |
| 273 | |
| 274 | void RegExpMacroAssemblerARM64::CheckGreedyLoop(Label* on_equal) { |
| 275 | __ Ldr(w10, MemOperand(backtrack_stackpointer())); |
| 276 | __ Cmp(current_input_offset(), w10); |
| 277 | __ Cset(x11, eq); |
| 278 | __ Add(backtrack_stackpointer(), |
| 279 | backtrack_stackpointer(), Operand(x11, LSL, kWRegSizeLog2)); |
| 280 | BranchOrBacktrack(eq, on_equal); |
| 281 | } |
| 282 | |
| 283 | void RegExpMacroAssemblerARM64::CheckNotBackReferenceIgnoreCase( |
| 284 | int start_reg, |
| 285 | Label* on_no_match) { |
| 286 | Label fallthrough; |
| 287 | |
| 288 | Register capture_start_offset = w10; |
| 289 | // Save the capture length in a callee-saved register so it will |
| 290 | // be preserved if we call a C helper. |
| 291 | Register capture_length = w19; |
| 292 | DCHECK(kCalleeSaved.IncludesAliasOf(capture_length)); |
| 293 | |
| 294 | // Find length of back-referenced capture. |
| 295 | DCHECK((start_reg % 2) == 0); |
| 296 | if (start_reg < kNumCachedRegisters) { |
| 297 | __ Mov(capture_start_offset.X(), GetCachedRegister(start_reg)); |
| 298 | __ Lsr(x11, GetCachedRegister(start_reg), kWRegSizeInBits); |
| 299 | } else { |
| 300 | __ Ldp(w11, capture_start_offset, capture_location(start_reg, x10)); |
| 301 | } |
| 302 | __ Sub(capture_length, w11, capture_start_offset); // Length to check. |
| 303 | // Succeed on empty capture (including no capture). |
| 304 | __ Cbz(capture_length, &fallthrough); |
| 305 | |
| 306 | // Check that there are enough characters left in the input. |
| 307 | __ Cmn(capture_length, current_input_offset()); |
| 308 | BranchOrBacktrack(gt, on_no_match); |
| 309 | |
| 310 | if (mode_ == LATIN1) { |
| 311 | Label success; |
| 312 | Label fail; |
| 313 | Label loop_check; |
| 314 | |
| 315 | Register capture_start_address = x12; |
| 316 | Register capture_end_addresss = x13; |
| 317 | Register current_position_address = x14; |
| 318 | |
| 319 | __ Add(capture_start_address, |
| 320 | input_end(), |
| 321 | Operand(capture_start_offset, SXTW)); |
| 322 | __ Add(capture_end_addresss, |
| 323 | capture_start_address, |
| 324 | Operand(capture_length, SXTW)); |
| 325 | __ Add(current_position_address, |
| 326 | input_end(), |
| 327 | Operand(current_input_offset(), SXTW)); |
| 328 | |
| 329 | Label loop; |
| 330 | __ Bind(&loop); |
| 331 | __ Ldrb(w10, MemOperand(capture_start_address, 1, PostIndex)); |
| 332 | __ Ldrb(w11, MemOperand(current_position_address, 1, PostIndex)); |
| 333 | __ Cmp(w10, w11); |
| 334 | __ B(eq, &loop_check); |
| 335 | |
| 336 | // Mismatch, try case-insensitive match (converting letters to lower-case). |
| 337 | __ Orr(w10, w10, 0x20); // Convert capture character to lower-case. |
| 338 | __ Orr(w11, w11, 0x20); // Also convert input character. |
| 339 | __ Cmp(w11, w10); |
| 340 | __ B(ne, &fail); |
| 341 | __ Sub(w10, w10, 'a'); |
| 342 | __ Cmp(w10, 'z' - 'a'); // Is w10 a lowercase letter? |
| 343 | __ B(ls, &loop_check); // In range 'a'-'z'. |
| 344 | // Latin-1: Check for values in range [224,254] but not 247. |
| 345 | __ Sub(w10, w10, 224 - 'a'); |
| 346 | __ Cmp(w10, 254 - 224); |
| 347 | __ Ccmp(w10, 247 - 224, ZFlag, ls); // Check for 247. |
| 348 | __ B(eq, &fail); // Weren't Latin-1 letters. |
| 349 | |
| 350 | __ Bind(&loop_check); |
| 351 | __ Cmp(capture_start_address, capture_end_addresss); |
| 352 | __ B(lt, &loop); |
| 353 | __ B(&success); |
| 354 | |
| 355 | __ Bind(&fail); |
| 356 | BranchOrBacktrack(al, on_no_match); |
| 357 | |
| 358 | __ Bind(&success); |
| 359 | // Compute new value of character position after the matched part. |
| 360 | __ Sub(current_input_offset().X(), current_position_address, input_end()); |
| 361 | if (masm_->emit_debug_code()) { |
| 362 | __ Cmp(current_input_offset().X(), Operand(current_input_offset(), SXTW)); |
| 363 | __ Ccmp(current_input_offset(), 0, NoFlag, eq); |
| 364 | // The current input offset should be <= 0, and fit in a W register. |
| 365 | __ Check(le, kOffsetOutOfRange); |
| 366 | } |
| 367 | } else { |
| 368 | DCHECK(mode_ == UC16); |
| 369 | int argument_count = 4; |
| 370 | |
| 371 | // The cached registers need to be retained. |
| 372 | CPURegList cached_registers(CPURegister::kRegister, kXRegSizeInBits, 0, 7); |
| 373 | DCHECK((cached_registers.Count() * 2) == kNumCachedRegisters); |
| 374 | __ PushCPURegList(cached_registers); |
| 375 | |
| 376 | // Put arguments into arguments registers. |
| 377 | // Parameters are |
| 378 | // x0: Address byte_offset1 - Address captured substring's start. |
| 379 | // x1: Address byte_offset2 - Address of current character position. |
| 380 | // w2: size_t byte_length - length of capture in bytes(!) |
| 381 | // x3: Isolate* isolate |
| 382 | |
| 383 | // Address of start of capture. |
| 384 | __ Add(x0, input_end(), Operand(capture_start_offset, SXTW)); |
| 385 | // Length of capture. |
| 386 | __ Mov(w2, capture_length); |
| 387 | // Address of current input position. |
| 388 | __ Add(x1, input_end(), Operand(current_input_offset(), SXTW)); |
| 389 | // Isolate. |
| 390 | __ Mov(x3, ExternalReference::isolate_address(isolate())); |
| 391 | |
| 392 | { |
| 393 | AllowExternalCallThatCantCauseGC scope(masm_); |
| 394 | ExternalReference function = |
| 395 | ExternalReference::re_case_insensitive_compare_uc16(isolate()); |
| 396 | __ CallCFunction(function, argument_count); |
| 397 | } |
| 398 | |
| 399 | // Check if function returned non-zero for success or zero for failure. |
| 400 | // x0 is one of the registers used as a cache so it must be tested before |
| 401 | // the cache is restored. |
| 402 | __ Cmp(x0, 0); |
| 403 | __ PopCPURegList(cached_registers); |
| 404 | BranchOrBacktrack(eq, on_no_match); |
| 405 | |
| 406 | // On success, increment position by length of capture. |
| 407 | __ Add(current_input_offset(), current_input_offset(), capture_length); |
| 408 | } |
| 409 | |
| 410 | __ Bind(&fallthrough); |
| 411 | } |
| 412 | |
| 413 | void RegExpMacroAssemblerARM64::CheckNotBackReference( |
| 414 | int start_reg, |
| 415 | Label* on_no_match) { |
| 416 | Label fallthrough; |
| 417 | |
| 418 | Register capture_start_address = x12; |
| 419 | Register capture_end_address = x13; |
| 420 | Register current_position_address = x14; |
| 421 | Register capture_length = w15; |
| 422 | |
| 423 | // Find length of back-referenced capture. |
| 424 | DCHECK((start_reg % 2) == 0); |
| 425 | if (start_reg < kNumCachedRegisters) { |
| 426 | __ Mov(x10, GetCachedRegister(start_reg)); |
| 427 | __ Lsr(x11, GetCachedRegister(start_reg), kWRegSizeInBits); |
| 428 | } else { |
| 429 | __ Ldp(w11, w10, capture_location(start_reg, x10)); |
| 430 | } |
| 431 | __ Sub(capture_length, w11, w10); // Length to check. |
| 432 | // Succeed on empty capture (including no capture). |
| 433 | __ Cbz(capture_length, &fallthrough); |
| 434 | |
| 435 | // Check that there are enough characters left in the input. |
| 436 | __ Cmn(capture_length, current_input_offset()); |
| 437 | BranchOrBacktrack(gt, on_no_match); |
| 438 | |
| 439 | // Compute pointers to match string and capture string |
| 440 | __ Add(capture_start_address, input_end(), Operand(w10, SXTW)); |
| 441 | __ Add(capture_end_address, |
| 442 | capture_start_address, |
| 443 | Operand(capture_length, SXTW)); |
| 444 | __ Add(current_position_address, |
| 445 | input_end(), |
| 446 | Operand(current_input_offset(), SXTW)); |
| 447 | |
| 448 | Label loop; |
| 449 | __ Bind(&loop); |
| 450 | if (mode_ == LATIN1) { |
| 451 | __ Ldrb(w10, MemOperand(capture_start_address, 1, PostIndex)); |
| 452 | __ Ldrb(w11, MemOperand(current_position_address, 1, PostIndex)); |
| 453 | } else { |
| 454 | DCHECK(mode_ == UC16); |
| 455 | __ Ldrh(w10, MemOperand(capture_start_address, 2, PostIndex)); |
| 456 | __ Ldrh(w11, MemOperand(current_position_address, 2, PostIndex)); |
| 457 | } |
| 458 | __ Cmp(w10, w11); |
| 459 | BranchOrBacktrack(ne, on_no_match); |
| 460 | __ Cmp(capture_start_address, capture_end_address); |
| 461 | __ B(lt, &loop); |
| 462 | |
| 463 | // Move current character position to position after match. |
| 464 | __ Sub(current_input_offset().X(), current_position_address, input_end()); |
| 465 | if (masm_->emit_debug_code()) { |
| 466 | __ Cmp(current_input_offset().X(), Operand(current_input_offset(), SXTW)); |
| 467 | __ Ccmp(current_input_offset(), 0, NoFlag, eq); |
| 468 | // The current input offset should be <= 0, and fit in a W register. |
| 469 | __ Check(le, kOffsetOutOfRange); |
| 470 | } |
| 471 | __ Bind(&fallthrough); |
| 472 | } |
| 473 | |
| 474 | |
| 475 | void RegExpMacroAssemblerARM64::CheckNotCharacter(unsigned c, |
| 476 | Label* on_not_equal) { |
| 477 | CompareAndBranchOrBacktrack(current_character(), c, ne, on_not_equal); |
| 478 | } |
| 479 | |
| 480 | |
| 481 | void RegExpMacroAssemblerARM64::CheckCharacterAfterAnd(uint32_t c, |
| 482 | uint32_t mask, |
| 483 | Label* on_equal) { |
| 484 | __ And(w10, current_character(), mask); |
| 485 | CompareAndBranchOrBacktrack(w10, c, eq, on_equal); |
| 486 | } |
| 487 | |
| 488 | |
| 489 | void RegExpMacroAssemblerARM64::CheckNotCharacterAfterAnd(unsigned c, |
| 490 | unsigned mask, |
| 491 | Label* on_not_equal) { |
| 492 | __ And(w10, current_character(), mask); |
| 493 | CompareAndBranchOrBacktrack(w10, c, ne, on_not_equal); |
| 494 | } |
| 495 | |
| 496 | |
| 497 | void RegExpMacroAssemblerARM64::CheckNotCharacterAfterMinusAnd( |
| 498 | uc16 c, |
| 499 | uc16 minus, |
| 500 | uc16 mask, |
| 501 | Label* on_not_equal) { |
| 502 | DCHECK(minus < String::kMaxUtf16CodeUnit); |
| 503 | __ Sub(w10, current_character(), minus); |
| 504 | __ And(w10, w10, mask); |
| 505 | CompareAndBranchOrBacktrack(w10, c, ne, on_not_equal); |
| 506 | } |
| 507 | |
| 508 | |
| 509 | void RegExpMacroAssemblerARM64::CheckCharacterInRange( |
| 510 | uc16 from, |
| 511 | uc16 to, |
| 512 | Label* on_in_range) { |
| 513 | __ Sub(w10, current_character(), from); |
| 514 | // Unsigned lower-or-same condition. |
| 515 | CompareAndBranchOrBacktrack(w10, to - from, ls, on_in_range); |
| 516 | } |
| 517 | |
| 518 | |
| 519 | void RegExpMacroAssemblerARM64::CheckCharacterNotInRange( |
| 520 | uc16 from, |
| 521 | uc16 to, |
| 522 | Label* on_not_in_range) { |
| 523 | __ Sub(w10, current_character(), from); |
| 524 | // Unsigned higher condition. |
| 525 | CompareAndBranchOrBacktrack(w10, to - from, hi, on_not_in_range); |
| 526 | } |
| 527 | |
| 528 | |
| 529 | void RegExpMacroAssemblerARM64::CheckBitInTable( |
| 530 | Handle<ByteArray> table, |
| 531 | Label* on_bit_set) { |
| 532 | __ Mov(x11, Operand(table)); |
| 533 | if ((mode_ != LATIN1) || (kTableMask != String::kMaxOneByteCharCode)) { |
| 534 | __ And(w10, current_character(), kTableMask); |
| 535 | __ Add(w10, w10, ByteArray::kHeaderSize - kHeapObjectTag); |
| 536 | } else { |
| 537 | __ Add(w10, current_character(), ByteArray::kHeaderSize - kHeapObjectTag); |
| 538 | } |
| 539 | __ Ldrb(w11, MemOperand(x11, w10, UXTW)); |
| 540 | CompareAndBranchOrBacktrack(w11, 0, ne, on_bit_set); |
| 541 | } |
| 542 | |
| 543 | |
| 544 | bool RegExpMacroAssemblerARM64::CheckSpecialCharacterClass(uc16 type, |
| 545 | Label* on_no_match) { |
| 546 | // Range checks (c in min..max) are generally implemented by an unsigned |
| 547 | // (c - min) <= (max - min) check |
| 548 | switch (type) { |
| 549 | case 's': |
| 550 | // Match space-characters |
| 551 | if (mode_ == LATIN1) { |
| 552 | // One byte space characters are '\t'..'\r', ' ' and \u00a0. |
| 553 | Label success; |
| 554 | // Check for ' ' or 0x00a0. |
| 555 | __ Cmp(current_character(), ' '); |
| 556 | __ Ccmp(current_character(), 0x00a0, ZFlag, ne); |
| 557 | __ B(eq, &success); |
| 558 | // Check range 0x09..0x0d. |
| 559 | __ Sub(w10, current_character(), '\t'); |
| 560 | CompareAndBranchOrBacktrack(w10, '\r' - '\t', hi, on_no_match); |
| 561 | __ Bind(&success); |
| 562 | return true; |
| 563 | } |
| 564 | return false; |
| 565 | case 'S': |
| 566 | // The emitted code for generic character classes is good enough. |
| 567 | return false; |
| 568 | case 'd': |
| 569 | // Match ASCII digits ('0'..'9'). |
| 570 | __ Sub(w10, current_character(), '0'); |
| 571 | CompareAndBranchOrBacktrack(w10, '9' - '0', hi, on_no_match); |
| 572 | return true; |
| 573 | case 'D': |
| 574 | // Match ASCII non-digits. |
| 575 | __ Sub(w10, current_character(), '0'); |
| 576 | CompareAndBranchOrBacktrack(w10, '9' - '0', ls, on_no_match); |
| 577 | return true; |
| 578 | case '.': { |
| 579 | // Match non-newlines (not 0x0a('\n'), 0x0d('\r'), 0x2028 and 0x2029) |
| 580 | // Here we emit the conditional branch only once at the end to make branch |
| 581 | // prediction more efficient, even though we could branch out of here |
| 582 | // as soon as a character matches. |
| 583 | __ Cmp(current_character(), 0x0a); |
| 584 | __ Ccmp(current_character(), 0x0d, ZFlag, ne); |
| 585 | if (mode_ == UC16) { |
| 586 | __ Sub(w10, current_character(), 0x2028); |
| 587 | // If the Z flag was set we clear the flags to force a branch. |
| 588 | __ Ccmp(w10, 0x2029 - 0x2028, NoFlag, ne); |
| 589 | // ls -> !((C==1) && (Z==0)) |
| 590 | BranchOrBacktrack(ls, on_no_match); |
| 591 | } else { |
| 592 | BranchOrBacktrack(eq, on_no_match); |
| 593 | } |
| 594 | return true; |
| 595 | } |
| 596 | case 'n': { |
| 597 | // Match newlines (0x0a('\n'), 0x0d('\r'), 0x2028 and 0x2029) |
| 598 | // We have to check all 4 newline characters before emitting |
| 599 | // the conditional branch. |
| 600 | __ Cmp(current_character(), 0x0a); |
| 601 | __ Ccmp(current_character(), 0x0d, ZFlag, ne); |
| 602 | if (mode_ == UC16) { |
| 603 | __ Sub(w10, current_character(), 0x2028); |
| 604 | // If the Z flag was set we clear the flags to force a fall-through. |
| 605 | __ Ccmp(w10, 0x2029 - 0x2028, NoFlag, ne); |
| 606 | // hi -> (C==1) && (Z==0) |
| 607 | BranchOrBacktrack(hi, on_no_match); |
| 608 | } else { |
| 609 | BranchOrBacktrack(ne, on_no_match); |
| 610 | } |
| 611 | return true; |
| 612 | } |
| 613 | case 'w': { |
| 614 | if (mode_ != LATIN1) { |
| 615 | // Table is 256 entries, so all Latin1 characters can be tested. |
| 616 | CompareAndBranchOrBacktrack(current_character(), 'z', hi, on_no_match); |
| 617 | } |
| 618 | ExternalReference map = ExternalReference::re_word_character_map(); |
| 619 | __ Mov(x10, map); |
| 620 | __ Ldrb(w10, MemOperand(x10, current_character(), UXTW)); |
| 621 | CompareAndBranchOrBacktrack(w10, 0, eq, on_no_match); |
| 622 | return true; |
| 623 | } |
| 624 | case 'W': { |
| 625 | Label done; |
| 626 | if (mode_ != LATIN1) { |
| 627 | // Table is 256 entries, so all Latin1 characters can be tested. |
| 628 | __ Cmp(current_character(), 'z'); |
| 629 | __ B(hi, &done); |
| 630 | } |
| 631 | ExternalReference map = ExternalReference::re_word_character_map(); |
| 632 | __ Mov(x10, map); |
| 633 | __ Ldrb(w10, MemOperand(x10, current_character(), UXTW)); |
| 634 | CompareAndBranchOrBacktrack(w10, 0, ne, on_no_match); |
| 635 | __ Bind(&done); |
| 636 | return true; |
| 637 | } |
| 638 | case '*': |
| 639 | // Match any character. |
| 640 | return true; |
| 641 | // No custom implementation (yet): s(UC16), S(UC16). |
| 642 | default: |
| 643 | return false; |
| 644 | } |
| 645 | } |
| 646 | |
| 647 | |
| 648 | void RegExpMacroAssemblerARM64::Fail() { |
| 649 | __ Mov(w0, FAILURE); |
| 650 | __ B(&exit_label_); |
| 651 | } |
| 652 | |
| 653 | |
| 654 | Handle<HeapObject> RegExpMacroAssemblerARM64::GetCode(Handle<String> source) { |
| 655 | Label return_w0; |
| 656 | // Finalize code - write the entry point code now we know how many |
| 657 | // registers we need. |
| 658 | |
| 659 | // Entry code: |
| 660 | __ Bind(&entry_label_); |
| 661 | |
| 662 | // Arguments on entry: |
| 663 | // x0: String* input |
| 664 | // x1: int start_offset |
| 665 | // x2: byte* input_start |
| 666 | // x3: byte* input_end |
| 667 | // x4: int* output array |
| 668 | // x5: int output array size |
| 669 | // x6: Address stack_base |
| 670 | // x7: int direct_call |
| 671 | |
| 672 | // The stack pointer should be csp on entry. |
| 673 | // csp[8]: address of the current isolate |
| 674 | // csp[0]: secondary link/return address used by native call |
| 675 | |
| 676 | // Tell the system that we have a stack frame. Because the type is MANUAL, no |
| 677 | // code is generated. |
| 678 | FrameScope scope(masm_, StackFrame::MANUAL); |
| 679 | |
| 680 | // Push registers on the stack, only push the argument registers that we need. |
| 681 | CPURegList argument_registers(x0, x5, x6, x7); |
| 682 | |
| 683 | CPURegList registers_to_retain = kCalleeSaved; |
| 684 | DCHECK(kCalleeSaved.Count() == 11); |
| 685 | registers_to_retain.Combine(lr); |
| 686 | |
| 687 | DCHECK(csp.Is(__ StackPointer())); |
| 688 | __ PushCPURegList(registers_to_retain); |
| 689 | __ PushCPURegList(argument_registers); |
| 690 | |
| 691 | // Set frame pointer in place. |
| 692 | __ Add(frame_pointer(), csp, argument_registers.Count() * kPointerSize); |
| 693 | |
| 694 | // Initialize callee-saved registers. |
| 695 | __ Mov(start_offset(), w1); |
| 696 | __ Mov(input_start(), x2); |
| 697 | __ Mov(input_end(), x3); |
| 698 | __ Mov(output_array(), x4); |
| 699 | |
| 700 | // Set the number of registers we will need to allocate, that is: |
| 701 | // - success_counter (X register) |
| 702 | // - (num_registers_ - kNumCachedRegisters) (W registers) |
| 703 | int num_wreg_to_allocate = num_registers_ - kNumCachedRegisters; |
| 704 | // Do not allocate registers on the stack if they can all be cached. |
| 705 | if (num_wreg_to_allocate < 0) { num_wreg_to_allocate = 0; } |
| 706 | // Make room for the success_counter. |
| 707 | num_wreg_to_allocate += 2; |
| 708 | |
| 709 | // Make sure the stack alignment will be respected. |
| 710 | int alignment = masm_->ActivationFrameAlignment(); |
| 711 | DCHECK_EQ(alignment % 16, 0); |
| 712 | int align_mask = (alignment / kWRegSize) - 1; |
| 713 | num_wreg_to_allocate = (num_wreg_to_allocate + align_mask) & ~align_mask; |
| 714 | |
| 715 | // Check if we have space on the stack. |
| 716 | Label stack_limit_hit; |
| 717 | Label stack_ok; |
| 718 | |
| 719 | ExternalReference stack_limit = |
| 720 | ExternalReference::address_of_stack_limit(isolate()); |
| 721 | __ Mov(x10, stack_limit); |
| 722 | __ Ldr(x10, MemOperand(x10)); |
| 723 | __ Subs(x10, csp, x10); |
| 724 | |
| 725 | // Handle it if the stack pointer is already below the stack limit. |
| 726 | __ B(ls, &stack_limit_hit); |
| 727 | |
| 728 | // Check if there is room for the variable number of registers above |
| 729 | // the stack limit. |
| 730 | __ Cmp(x10, num_wreg_to_allocate * kWRegSize); |
| 731 | __ B(hs, &stack_ok); |
| 732 | |
| 733 | // Exit with OutOfMemory exception. There is not enough space on the stack |
| 734 | // for our working registers. |
| 735 | __ Mov(w0, EXCEPTION); |
| 736 | __ B(&return_w0); |
| 737 | |
| 738 | __ Bind(&stack_limit_hit); |
| 739 | CallCheckStackGuardState(x10); |
| 740 | // If returned value is non-zero, we exit with the returned value as result. |
| 741 | __ Cbnz(w0, &return_w0); |
| 742 | |
| 743 | __ Bind(&stack_ok); |
| 744 | |
| 745 | // Allocate space on stack. |
| 746 | __ Claim(num_wreg_to_allocate, kWRegSize); |
| 747 | |
| 748 | // Initialize success_counter with 0. |
| 749 | __ Str(wzr, MemOperand(frame_pointer(), kSuccessCounter)); |
| 750 | |
| 751 | // Find negative length (offset of start relative to end). |
| 752 | __ Sub(x10, input_start(), input_end()); |
| 753 | if (masm_->emit_debug_code()) { |
| 754 | // Check that the input string length is < 2^30. |
| 755 | __ Neg(x11, x10); |
| 756 | __ Cmp(x11, (1<<30) - 1); |
| 757 | __ Check(ls, kInputStringTooLong); |
| 758 | } |
| 759 | __ Mov(current_input_offset(), w10); |
| 760 | |
| 761 | // The non-position value is used as a clearing value for the |
| 762 | // capture registers, it corresponds to the position of the first character |
| 763 | // minus one. |
| 764 | __ Sub(non_position_value(), current_input_offset(), char_size()); |
| 765 | __ Sub(non_position_value(), non_position_value(), |
| 766 | Operand(start_offset(), LSL, (mode_ == UC16) ? 1 : 0)); |
| 767 | // We can store this value twice in an X register for initializing |
| 768 | // on-stack registers later. |
| 769 | __ Orr(twice_non_position_value(), |
| 770 | non_position_value().X(), |
| 771 | Operand(non_position_value().X(), LSL, kWRegSizeInBits)); |
| 772 | |
| 773 | // Initialize code pointer register. |
| 774 | __ Mov(code_pointer(), Operand(masm_->CodeObject())); |
| 775 | |
| 776 | Label load_char_start_regexp, start_regexp; |
| 777 | // Load newline if index is at start, previous character otherwise. |
| 778 | __ Cbnz(start_offset(), &load_char_start_regexp); |
| 779 | __ Mov(current_character(), '\n'); |
| 780 | __ B(&start_regexp); |
| 781 | |
| 782 | // Global regexp restarts matching here. |
| 783 | __ Bind(&load_char_start_regexp); |
| 784 | // Load previous char as initial value of current character register. |
| 785 | LoadCurrentCharacterUnchecked(-1, 1); |
| 786 | __ Bind(&start_regexp); |
| 787 | // Initialize on-stack registers. |
| 788 | if (num_saved_registers_ > 0) { |
| 789 | ClearRegisters(0, num_saved_registers_ - 1); |
| 790 | } |
| 791 | |
| 792 | // Initialize backtrack stack pointer. |
| 793 | __ Ldr(backtrack_stackpointer(), MemOperand(frame_pointer(), kStackBase)); |
| 794 | |
| 795 | // Execute |
| 796 | __ B(&start_label_); |
| 797 | |
| 798 | if (backtrack_label_.is_linked()) { |
| 799 | __ Bind(&backtrack_label_); |
| 800 | Backtrack(); |
| 801 | } |
| 802 | |
| 803 | if (success_label_.is_linked()) { |
| 804 | Register first_capture_start = w15; |
| 805 | |
| 806 | // Save captures when successful. |
| 807 | __ Bind(&success_label_); |
| 808 | |
| 809 | if (num_saved_registers_ > 0) { |
| 810 | // V8 expects the output to be an int32_t array. |
| 811 | Register capture_start = w12; |
| 812 | Register capture_end = w13; |
| 813 | Register input_length = w14; |
| 814 | |
| 815 | // Copy captures to output. |
| 816 | |
| 817 | // Get string length. |
| 818 | __ Sub(x10, input_end(), input_start()); |
| 819 | if (masm_->emit_debug_code()) { |
| 820 | // Check that the input string length is < 2^30. |
| 821 | __ Cmp(x10, (1<<30) - 1); |
| 822 | __ Check(ls, kInputStringTooLong); |
| 823 | } |
| 824 | // input_start has a start_offset offset on entry. We need to include |
| 825 | // it when computing the length of the whole string. |
| 826 | if (mode_ == UC16) { |
| 827 | __ Add(input_length, start_offset(), Operand(w10, LSR, 1)); |
| 828 | } else { |
| 829 | __ Add(input_length, start_offset(), w10); |
| 830 | } |
| 831 | |
| 832 | // Copy the results to the output array from the cached registers first. |
| 833 | for (int i = 0; |
| 834 | (i < num_saved_registers_) && (i < kNumCachedRegisters); |
| 835 | i += 2) { |
| 836 | __ Mov(capture_start.X(), GetCachedRegister(i)); |
| 837 | __ Lsr(capture_end.X(), capture_start.X(), kWRegSizeInBits); |
| 838 | if ((i == 0) && global_with_zero_length_check()) { |
| 839 | // Keep capture start for the zero-length check later. |
| 840 | __ Mov(first_capture_start, capture_start); |
| 841 | } |
| 842 | // Offsets need to be relative to the start of the string. |
| 843 | if (mode_ == UC16) { |
| 844 | __ Add(capture_start, input_length, Operand(capture_start, ASR, 1)); |
| 845 | __ Add(capture_end, input_length, Operand(capture_end, ASR, 1)); |
| 846 | } else { |
| 847 | __ Add(capture_start, input_length, capture_start); |
| 848 | __ Add(capture_end, input_length, capture_end); |
| 849 | } |
| 850 | // The output pointer advances for a possible global match. |
| 851 | __ Stp(capture_start, |
| 852 | capture_end, |
| 853 | MemOperand(output_array(), kPointerSize, PostIndex)); |
| 854 | } |
| 855 | |
| 856 | // Only carry on if there are more than kNumCachedRegisters capture |
| 857 | // registers. |
| 858 | int num_registers_left_on_stack = |
| 859 | num_saved_registers_ - kNumCachedRegisters; |
| 860 | if (num_registers_left_on_stack > 0) { |
| 861 | Register base = x10; |
| 862 | // There are always an even number of capture registers. A couple of |
| 863 | // registers determine one match with two offsets. |
| 864 | DCHECK_EQ(0, num_registers_left_on_stack % 2); |
| 865 | __ Add(base, frame_pointer(), kFirstCaptureOnStack); |
| 866 | |
| 867 | // We can unroll the loop here, we should not unroll for less than 2 |
| 868 | // registers. |
| 869 | STATIC_ASSERT(kNumRegistersToUnroll > 2); |
| 870 | if (num_registers_left_on_stack <= kNumRegistersToUnroll) { |
| 871 | for (int i = 0; i < num_registers_left_on_stack / 2; i++) { |
| 872 | __ Ldp(capture_end, |
| 873 | capture_start, |
| 874 | MemOperand(base, -kPointerSize, PostIndex)); |
| 875 | if ((i == 0) && global_with_zero_length_check()) { |
| 876 | // Keep capture start for the zero-length check later. |
| 877 | __ Mov(first_capture_start, capture_start); |
| 878 | } |
| 879 | // Offsets need to be relative to the start of the string. |
| 880 | if (mode_ == UC16) { |
| 881 | __ Add(capture_start, |
| 882 | input_length, |
| 883 | Operand(capture_start, ASR, 1)); |
| 884 | __ Add(capture_end, input_length, Operand(capture_end, ASR, 1)); |
| 885 | } else { |
| 886 | __ Add(capture_start, input_length, capture_start); |
| 887 | __ Add(capture_end, input_length, capture_end); |
| 888 | } |
| 889 | // The output pointer advances for a possible global match. |
| 890 | __ Stp(capture_start, |
| 891 | capture_end, |
| 892 | MemOperand(output_array(), kPointerSize, PostIndex)); |
| 893 | } |
| 894 | } else { |
| 895 | Label loop, start; |
| 896 | __ Mov(x11, num_registers_left_on_stack); |
| 897 | |
| 898 | __ Ldp(capture_end, |
| 899 | capture_start, |
| 900 | MemOperand(base, -kPointerSize, PostIndex)); |
| 901 | if (global_with_zero_length_check()) { |
| 902 | __ Mov(first_capture_start, capture_start); |
| 903 | } |
| 904 | __ B(&start); |
| 905 | |
| 906 | __ Bind(&loop); |
| 907 | __ Ldp(capture_end, |
| 908 | capture_start, |
| 909 | MemOperand(base, -kPointerSize, PostIndex)); |
| 910 | __ Bind(&start); |
| 911 | if (mode_ == UC16) { |
| 912 | __ Add(capture_start, input_length, Operand(capture_start, ASR, 1)); |
| 913 | __ Add(capture_end, input_length, Operand(capture_end, ASR, 1)); |
| 914 | } else { |
| 915 | __ Add(capture_start, input_length, capture_start); |
| 916 | __ Add(capture_end, input_length, capture_end); |
| 917 | } |
| 918 | // The output pointer advances for a possible global match. |
| 919 | __ Stp(capture_start, |
| 920 | capture_end, |
| 921 | MemOperand(output_array(), kPointerSize, PostIndex)); |
| 922 | __ Sub(x11, x11, 2); |
| 923 | __ Cbnz(x11, &loop); |
| 924 | } |
| 925 | } |
| 926 | } |
| 927 | |
| 928 | if (global()) { |
| 929 | Register success_counter = w0; |
| 930 | Register output_size = x10; |
| 931 | // Restart matching if the regular expression is flagged as global. |
| 932 | |
| 933 | // Increment success counter. |
| 934 | __ Ldr(success_counter, MemOperand(frame_pointer(), kSuccessCounter)); |
| 935 | __ Add(success_counter, success_counter, 1); |
| 936 | __ Str(success_counter, MemOperand(frame_pointer(), kSuccessCounter)); |
| 937 | |
| 938 | // Capture results have been stored, so the number of remaining global |
| 939 | // output registers is reduced by the number of stored captures. |
| 940 | __ Ldr(output_size, MemOperand(frame_pointer(), kOutputSize)); |
| 941 | __ Sub(output_size, output_size, num_saved_registers_); |
| 942 | // Check whether we have enough room for another set of capture results. |
| 943 | __ Cmp(output_size, num_saved_registers_); |
| 944 | __ B(lt, &return_w0); |
| 945 | |
| 946 | // The output pointer is already set to the next field in the output |
| 947 | // array. |
| 948 | // Update output size on the frame before we restart matching. |
| 949 | __ Str(output_size, MemOperand(frame_pointer(), kOutputSize)); |
| 950 | |
| 951 | if (global_with_zero_length_check()) { |
| 952 | // Special case for zero-length matches. |
| 953 | __ Cmp(current_input_offset(), first_capture_start); |
| 954 | // Not a zero-length match, restart. |
| 955 | __ B(ne, &load_char_start_regexp); |
| 956 | // Offset from the end is zero if we already reached the end. |
| 957 | __ Cbz(current_input_offset(), &return_w0); |
| 958 | // Advance current position after a zero-length match. |
| 959 | __ Add(current_input_offset(), |
| 960 | current_input_offset(), |
| 961 | Operand((mode_ == UC16) ? 2 : 1)); |
| 962 | } |
| 963 | |
| 964 | __ B(&load_char_start_regexp); |
| 965 | } else { |
| 966 | __ Mov(w0, SUCCESS); |
| 967 | } |
| 968 | } |
| 969 | |
| 970 | if (exit_label_.is_linked()) { |
| 971 | // Exit and return w0 |
| 972 | __ Bind(&exit_label_); |
| 973 | if (global()) { |
| 974 | __ Ldr(w0, MemOperand(frame_pointer(), kSuccessCounter)); |
| 975 | } |
| 976 | } |
| 977 | |
| 978 | __ Bind(&return_w0); |
| 979 | |
| 980 | // Set stack pointer back to first register to retain |
| 981 | DCHECK(csp.Is(__ StackPointer())); |
| 982 | __ Mov(csp, fp); |
| 983 | __ AssertStackConsistency(); |
| 984 | |
| 985 | // Restore registers. |
| 986 | __ PopCPURegList(registers_to_retain); |
| 987 | |
| 988 | __ Ret(); |
| 989 | |
| 990 | Label exit_with_exception; |
| 991 | // Registers x0 to x7 are used to store the first captures, they need to be |
| 992 | // retained over calls to C++ code. |
| 993 | CPURegList cached_registers(CPURegister::kRegister, kXRegSizeInBits, 0, 7); |
| 994 | DCHECK((cached_registers.Count() * 2) == kNumCachedRegisters); |
| 995 | |
| 996 | if (check_preempt_label_.is_linked()) { |
| 997 | __ Bind(&check_preempt_label_); |
| 998 | SaveLinkRegister(); |
| 999 | // The cached registers need to be retained. |
| 1000 | __ PushCPURegList(cached_registers); |
| 1001 | CallCheckStackGuardState(x10); |
| 1002 | // Returning from the regexp code restores the stack (csp <- fp) |
| 1003 | // so we don't need to drop the link register from it before exiting. |
| 1004 | __ Cbnz(w0, &return_w0); |
| 1005 | // Reset the cached registers. |
| 1006 | __ PopCPURegList(cached_registers); |
| 1007 | RestoreLinkRegister(); |
| 1008 | __ Ret(); |
| 1009 | } |
| 1010 | |
| 1011 | if (stack_overflow_label_.is_linked()) { |
| 1012 | __ Bind(&stack_overflow_label_); |
| 1013 | SaveLinkRegister(); |
| 1014 | // The cached registers need to be retained. |
| 1015 | __ PushCPURegList(cached_registers); |
| 1016 | // Call GrowStack(backtrack_stackpointer(), &stack_base) |
| 1017 | __ Mov(x2, ExternalReference::isolate_address(isolate())); |
| 1018 | __ Add(x1, frame_pointer(), kStackBase); |
| 1019 | __ Mov(x0, backtrack_stackpointer()); |
| 1020 | ExternalReference grow_stack = |
| 1021 | ExternalReference::re_grow_stack(isolate()); |
| 1022 | __ CallCFunction(grow_stack, 3); |
| 1023 | // If return NULL, we have failed to grow the stack, and |
| 1024 | // must exit with a stack-overflow exception. |
| 1025 | // Returning from the regexp code restores the stack (csp <- fp) |
| 1026 | // so we don't need to drop the link register from it before exiting. |
| 1027 | __ Cbz(w0, &exit_with_exception); |
| 1028 | // Otherwise use return value as new stack pointer. |
| 1029 | __ Mov(backtrack_stackpointer(), x0); |
| 1030 | // Reset the cached registers. |
| 1031 | __ PopCPURegList(cached_registers); |
| 1032 | RestoreLinkRegister(); |
| 1033 | __ Ret(); |
| 1034 | } |
| 1035 | |
| 1036 | if (exit_with_exception.is_linked()) { |
| 1037 | __ Bind(&exit_with_exception); |
| 1038 | __ Mov(w0, EXCEPTION); |
| 1039 | __ B(&return_w0); |
| 1040 | } |
| 1041 | |
| 1042 | CodeDesc code_desc; |
| 1043 | masm_->GetCode(&code_desc); |
| 1044 | Handle<Code> code = isolate()->factory()->NewCode( |
| 1045 | code_desc, Code::ComputeFlags(Code::REGEXP), masm_->CodeObject()); |
| 1046 | PROFILE(masm_->isolate(), RegExpCodeCreateEvent(*code, *source)); |
| 1047 | return Handle<HeapObject>::cast(code); |
| 1048 | } |
| 1049 | |
| 1050 | |
| 1051 | void RegExpMacroAssemblerARM64::GoTo(Label* to) { |
| 1052 | BranchOrBacktrack(al, to); |
| 1053 | } |
| 1054 | |
| 1055 | void RegExpMacroAssemblerARM64::IfRegisterGE(int reg, int comparand, |
| 1056 | Label* if_ge) { |
| 1057 | Register to_compare = GetRegister(reg, w10); |
| 1058 | CompareAndBranchOrBacktrack(to_compare, comparand, ge, if_ge); |
| 1059 | } |
| 1060 | |
| 1061 | |
| 1062 | void RegExpMacroAssemblerARM64::IfRegisterLT(int reg, int comparand, |
| 1063 | Label* if_lt) { |
| 1064 | Register to_compare = GetRegister(reg, w10); |
| 1065 | CompareAndBranchOrBacktrack(to_compare, comparand, lt, if_lt); |
| 1066 | } |
| 1067 | |
| 1068 | |
| 1069 | void RegExpMacroAssemblerARM64::IfRegisterEqPos(int reg, Label* if_eq) { |
| 1070 | Register to_compare = GetRegister(reg, w10); |
| 1071 | __ Cmp(to_compare, current_input_offset()); |
| 1072 | BranchOrBacktrack(eq, if_eq); |
| 1073 | } |
| 1074 | |
| 1075 | RegExpMacroAssembler::IrregexpImplementation |
| 1076 | RegExpMacroAssemblerARM64::Implementation() { |
| 1077 | return kARM64Implementation; |
| 1078 | } |
| 1079 | |
| 1080 | |
| 1081 | void RegExpMacroAssemblerARM64::LoadCurrentCharacter(int cp_offset, |
| 1082 | Label* on_end_of_input, |
| 1083 | bool check_bounds, |
| 1084 | int characters) { |
| 1085 | // TODO(pielan): Make sure long strings are caught before this, and not |
| 1086 | // just asserted in debug mode. |
| 1087 | DCHECK(cp_offset >= -1); // ^ and \b can look behind one character. |
| 1088 | // Be sane! (And ensure that an int32_t can be used to index the string) |
| 1089 | DCHECK(cp_offset < (1<<30)); |
| 1090 | if (check_bounds) { |
| 1091 | CheckPosition(cp_offset + characters - 1, on_end_of_input); |
| 1092 | } |
| 1093 | LoadCurrentCharacterUnchecked(cp_offset, characters); |
| 1094 | } |
| 1095 | |
| 1096 | |
| 1097 | void RegExpMacroAssemblerARM64::PopCurrentPosition() { |
| 1098 | Pop(current_input_offset()); |
| 1099 | } |
| 1100 | |
| 1101 | |
| 1102 | void RegExpMacroAssemblerARM64::PopRegister(int register_index) { |
| 1103 | Pop(w10); |
| 1104 | StoreRegister(register_index, w10); |
| 1105 | } |
| 1106 | |
| 1107 | |
| 1108 | void RegExpMacroAssemblerARM64::PushBacktrack(Label* label) { |
| 1109 | if (label->is_bound()) { |
| 1110 | int target = label->pos(); |
| 1111 | __ Mov(w10, target + Code::kHeaderSize - kHeapObjectTag); |
| 1112 | } else { |
| 1113 | __ Adr(x10, label, MacroAssembler::kAdrFar); |
| 1114 | __ Sub(x10, x10, code_pointer()); |
| 1115 | if (masm_->emit_debug_code()) { |
| 1116 | __ Cmp(x10, kWRegMask); |
| 1117 | // The code offset has to fit in a W register. |
| 1118 | __ Check(ls, kOffsetOutOfRange); |
| 1119 | } |
| 1120 | } |
| 1121 | Push(w10); |
| 1122 | CheckStackLimit(); |
| 1123 | } |
| 1124 | |
| 1125 | |
| 1126 | void RegExpMacroAssemblerARM64::PushCurrentPosition() { |
| 1127 | Push(current_input_offset()); |
| 1128 | } |
| 1129 | |
| 1130 | |
| 1131 | void RegExpMacroAssemblerARM64::PushRegister(int register_index, |
| 1132 | StackCheckFlag check_stack_limit) { |
| 1133 | Register to_push = GetRegister(register_index, w10); |
| 1134 | Push(to_push); |
| 1135 | if (check_stack_limit) CheckStackLimit(); |
| 1136 | } |
| 1137 | |
| 1138 | |
| 1139 | void RegExpMacroAssemblerARM64::ReadCurrentPositionFromRegister(int reg) { |
| 1140 | Register cached_register; |
| 1141 | RegisterState register_state = GetRegisterState(reg); |
| 1142 | switch (register_state) { |
| 1143 | case STACKED: |
| 1144 | __ Ldr(current_input_offset(), register_location(reg)); |
| 1145 | break; |
| 1146 | case CACHED_LSW: |
| 1147 | cached_register = GetCachedRegister(reg); |
| 1148 | __ Mov(current_input_offset(), cached_register.W()); |
| 1149 | break; |
| 1150 | case CACHED_MSW: |
| 1151 | cached_register = GetCachedRegister(reg); |
| 1152 | __ Lsr(current_input_offset().X(), cached_register, kWRegSizeInBits); |
| 1153 | break; |
| 1154 | default: |
| 1155 | UNREACHABLE(); |
| 1156 | break; |
| 1157 | } |
| 1158 | } |
| 1159 | |
| 1160 | |
| 1161 | void RegExpMacroAssemblerARM64::ReadStackPointerFromRegister(int reg) { |
| 1162 | Register read_from = GetRegister(reg, w10); |
| 1163 | __ Ldr(x11, MemOperand(frame_pointer(), kStackBase)); |
| 1164 | __ Add(backtrack_stackpointer(), x11, Operand(read_from, SXTW)); |
| 1165 | } |
| 1166 | |
| 1167 | |
| 1168 | void RegExpMacroAssemblerARM64::SetCurrentPositionFromEnd(int by) { |
| 1169 | Label after_position; |
| 1170 | __ Cmp(current_input_offset(), -by * char_size()); |
| 1171 | __ B(ge, &after_position); |
| 1172 | __ Mov(current_input_offset(), -by * char_size()); |
| 1173 | // On RegExp code entry (where this operation is used), the character before |
| 1174 | // the current position is expected to be already loaded. |
| 1175 | // We have advanced the position, so it's safe to read backwards. |
| 1176 | LoadCurrentCharacterUnchecked(-1, 1); |
| 1177 | __ Bind(&after_position); |
| 1178 | } |
| 1179 | |
| 1180 | |
| 1181 | void RegExpMacroAssemblerARM64::SetRegister(int register_index, int to) { |
| 1182 | DCHECK(register_index >= num_saved_registers_); // Reserved for positions! |
| 1183 | Register set_to = wzr; |
| 1184 | if (to != 0) { |
| 1185 | set_to = w10; |
| 1186 | __ Mov(set_to, to); |
| 1187 | } |
| 1188 | StoreRegister(register_index, set_to); |
| 1189 | } |
| 1190 | |
| 1191 | |
| 1192 | bool RegExpMacroAssemblerARM64::Succeed() { |
| 1193 | __ B(&success_label_); |
| 1194 | return global(); |
| 1195 | } |
| 1196 | |
| 1197 | |
| 1198 | void RegExpMacroAssemblerARM64::WriteCurrentPositionToRegister(int reg, |
| 1199 | int cp_offset) { |
| 1200 | Register position = current_input_offset(); |
| 1201 | if (cp_offset != 0) { |
| 1202 | position = w10; |
| 1203 | __ Add(position, current_input_offset(), cp_offset * char_size()); |
| 1204 | } |
| 1205 | StoreRegister(reg, position); |
| 1206 | } |
| 1207 | |
| 1208 | |
| 1209 | void RegExpMacroAssemblerARM64::ClearRegisters(int reg_from, int reg_to) { |
| 1210 | DCHECK(reg_from <= reg_to); |
| 1211 | int num_registers = reg_to - reg_from + 1; |
| 1212 | |
| 1213 | // If the first capture register is cached in a hardware register but not |
| 1214 | // aligned on a 64-bit one, we need to clear the first one specifically. |
| 1215 | if ((reg_from < kNumCachedRegisters) && ((reg_from % 2) != 0)) { |
| 1216 | StoreRegister(reg_from, non_position_value()); |
| 1217 | num_registers--; |
| 1218 | reg_from++; |
| 1219 | } |
| 1220 | |
| 1221 | // Clear cached registers in pairs as far as possible. |
| 1222 | while ((num_registers >= 2) && (reg_from < kNumCachedRegisters)) { |
| 1223 | DCHECK(GetRegisterState(reg_from) == CACHED_LSW); |
| 1224 | __ Mov(GetCachedRegister(reg_from), twice_non_position_value()); |
| 1225 | reg_from += 2; |
| 1226 | num_registers -= 2; |
| 1227 | } |
| 1228 | |
| 1229 | if ((num_registers % 2) == 1) { |
| 1230 | StoreRegister(reg_from, non_position_value()); |
| 1231 | num_registers--; |
| 1232 | reg_from++; |
| 1233 | } |
| 1234 | |
| 1235 | if (num_registers > 0) { |
| 1236 | // If there are some remaining registers, they are stored on the stack. |
| 1237 | DCHECK(reg_from >= kNumCachedRegisters); |
| 1238 | |
| 1239 | // Move down the indexes of the registers on stack to get the correct offset |
| 1240 | // in memory. |
| 1241 | reg_from -= kNumCachedRegisters; |
| 1242 | reg_to -= kNumCachedRegisters; |
| 1243 | // We should not unroll the loop for less than 2 registers. |
| 1244 | STATIC_ASSERT(kNumRegistersToUnroll > 2); |
| 1245 | // We position the base pointer to (reg_from + 1). |
| 1246 | int base_offset = kFirstRegisterOnStack - |
| 1247 | kWRegSize - (kWRegSize * reg_from); |
| 1248 | if (num_registers > kNumRegistersToUnroll) { |
| 1249 | Register base = x10; |
| 1250 | __ Add(base, frame_pointer(), base_offset); |
| 1251 | |
| 1252 | Label loop; |
| 1253 | __ Mov(x11, num_registers); |
| 1254 | __ Bind(&loop); |
| 1255 | __ Str(twice_non_position_value(), |
| 1256 | MemOperand(base, -kPointerSize, PostIndex)); |
| 1257 | __ Sub(x11, x11, 2); |
| 1258 | __ Cbnz(x11, &loop); |
| 1259 | } else { |
| 1260 | for (int i = reg_from; i <= reg_to; i += 2) { |
| 1261 | __ Str(twice_non_position_value(), |
| 1262 | MemOperand(frame_pointer(), base_offset)); |
| 1263 | base_offset -= kWRegSize * 2; |
| 1264 | } |
| 1265 | } |
| 1266 | } |
| 1267 | } |
| 1268 | |
| 1269 | |
| 1270 | void RegExpMacroAssemblerARM64::WriteStackPointerToRegister(int reg) { |
| 1271 | __ Ldr(x10, MemOperand(frame_pointer(), kStackBase)); |
| 1272 | __ Sub(x10, backtrack_stackpointer(), x10); |
| 1273 | if (masm_->emit_debug_code()) { |
| 1274 | __ Cmp(x10, Operand(w10, SXTW)); |
| 1275 | // The stack offset needs to fit in a W register. |
| 1276 | __ Check(eq, kOffsetOutOfRange); |
| 1277 | } |
| 1278 | StoreRegister(reg, w10); |
| 1279 | } |
| 1280 | |
| 1281 | |
| 1282 | // Helper function for reading a value out of a stack frame. |
| 1283 | template <typename T> |
| 1284 | static T& frame_entry(Address re_frame, int frame_offset) { |
| 1285 | return *reinterpret_cast<T*>(re_frame + frame_offset); |
| 1286 | } |
| 1287 | |
| 1288 | |
| 1289 | int RegExpMacroAssemblerARM64::CheckStackGuardState(Address* return_address, |
| 1290 | Code* re_code, |
| 1291 | Address re_frame, |
| 1292 | int start_offset, |
| 1293 | const byte** input_start, |
| 1294 | const byte** input_end) { |
| 1295 | Isolate* isolate = frame_entry<Isolate*>(re_frame, kIsolate); |
| 1296 | StackLimitCheck check(isolate); |
| 1297 | if (check.JsHasOverflowed()) { |
| 1298 | isolate->StackOverflow(); |
| 1299 | return EXCEPTION; |
| 1300 | } |
| 1301 | |
| 1302 | // If not real stack overflow the stack guard was used to interrupt |
| 1303 | // execution for another purpose. |
| 1304 | |
| 1305 | // If this is a direct call from JavaScript retry the RegExp forcing the call |
| 1306 | // through the runtime system. Currently the direct call cannot handle a GC. |
| 1307 | if (frame_entry<int>(re_frame, kDirectCall) == 1) { |
| 1308 | return RETRY; |
| 1309 | } |
| 1310 | |
| 1311 | // Prepare for possible GC. |
| 1312 | HandleScope handles(isolate); |
| 1313 | Handle<Code> code_handle(re_code); |
| 1314 | |
| 1315 | Handle<String> subject(frame_entry<String*>(re_frame, kInput)); |
| 1316 | |
| 1317 | // Current string. |
| 1318 | bool is_one_byte = subject->IsOneByteRepresentationUnderneath(); |
| 1319 | |
| 1320 | DCHECK(re_code->instruction_start() <= *return_address); |
| 1321 | DCHECK(*return_address <= |
| 1322 | re_code->instruction_start() + re_code->instruction_size()); |
| 1323 | |
| 1324 | Object* result = isolate->stack_guard()->HandleInterrupts(); |
| 1325 | |
| 1326 | if (*code_handle != re_code) { // Return address no longer valid |
| 1327 | int delta = code_handle->address() - re_code->address(); |
| 1328 | // Overwrite the return address on the stack. |
| 1329 | *return_address += delta; |
| 1330 | } |
| 1331 | |
| 1332 | if (result->IsException()) { |
| 1333 | return EXCEPTION; |
| 1334 | } |
| 1335 | |
| 1336 | Handle<String> subject_tmp = subject; |
| 1337 | int slice_offset = 0; |
| 1338 | |
| 1339 | // Extract the underlying string and the slice offset. |
| 1340 | if (StringShape(*subject_tmp).IsCons()) { |
| 1341 | subject_tmp = Handle<String>(ConsString::cast(*subject_tmp)->first()); |
| 1342 | } else if (StringShape(*subject_tmp).IsSliced()) { |
| 1343 | SlicedString* slice = SlicedString::cast(*subject_tmp); |
| 1344 | subject_tmp = Handle<String>(slice->parent()); |
| 1345 | slice_offset = slice->offset(); |
| 1346 | } |
| 1347 | |
| 1348 | // String might have changed. |
| 1349 | if (subject_tmp->IsOneByteRepresentation() != is_one_byte) { |
| 1350 | // If we changed between an Latin1 and an UC16 string, the specialized |
| 1351 | // code cannot be used, and we need to restart regexp matching from |
| 1352 | // scratch (including, potentially, compiling a new version of the code). |
| 1353 | return RETRY; |
| 1354 | } |
| 1355 | |
| 1356 | // Otherwise, the content of the string might have moved. It must still |
| 1357 | // be a sequential or external string with the same content. |
| 1358 | // Update the start and end pointers in the stack frame to the current |
| 1359 | // location (whether it has actually moved or not). |
| 1360 | DCHECK(StringShape(*subject_tmp).IsSequential() || |
| 1361 | StringShape(*subject_tmp).IsExternal()); |
| 1362 | |
| 1363 | // The original start address of the characters to match. |
| 1364 | const byte* start_address = *input_start; |
| 1365 | |
| 1366 | // Find the current start address of the same character at the current string |
| 1367 | // position. |
| 1368 | const byte* new_address = StringCharacterPosition(*subject_tmp, |
| 1369 | start_offset + slice_offset); |
| 1370 | |
| 1371 | if (start_address != new_address) { |
| 1372 | // If there is a difference, update the object pointer and start and end |
| 1373 | // addresses in the RegExp stack frame to match the new value. |
| 1374 | const byte* end_address = *input_end; |
| 1375 | int byte_length = static_cast<int>(end_address - start_address); |
| 1376 | frame_entry<const String*>(re_frame, kInput) = *subject; |
| 1377 | *input_start = new_address; |
| 1378 | *input_end = new_address + byte_length; |
| 1379 | } else if (frame_entry<const String*>(re_frame, kInput) != *subject) { |
| 1380 | // Subject string might have been a ConsString that underwent |
| 1381 | // short-circuiting during GC. That will not change start_address but |
| 1382 | // will change pointer inside the subject handle. |
| 1383 | frame_entry<const String*>(re_frame, kInput) = *subject; |
| 1384 | } |
| 1385 | |
| 1386 | return 0; |
| 1387 | } |
| 1388 | |
| 1389 | |
| 1390 | void RegExpMacroAssemblerARM64::CheckPosition(int cp_offset, |
| 1391 | Label* on_outside_input) { |
| 1392 | CompareAndBranchOrBacktrack(current_input_offset(), |
| 1393 | -cp_offset * char_size(), |
| 1394 | ge, |
| 1395 | on_outside_input); |
| 1396 | } |
| 1397 | |
| 1398 | |
| 1399 | bool RegExpMacroAssemblerARM64::CanReadUnaligned() { |
| 1400 | // TODO(pielan): See whether or not we should disable unaligned accesses. |
| 1401 | return !slow_safe(); |
| 1402 | } |
| 1403 | |
| 1404 | |
| 1405 | // Private methods: |
| 1406 | |
| 1407 | void RegExpMacroAssemblerARM64::CallCheckStackGuardState(Register scratch) { |
| 1408 | // Allocate space on the stack to store the return address. The |
| 1409 | // CheckStackGuardState C++ function will override it if the code |
| 1410 | // moved. Allocate extra space for 2 arguments passed by pointers. |
| 1411 | // AAPCS64 requires the stack to be 16 byte aligned. |
| 1412 | int alignment = masm_->ActivationFrameAlignment(); |
| 1413 | DCHECK_EQ(alignment % 16, 0); |
| 1414 | int align_mask = (alignment / kXRegSize) - 1; |
| 1415 | int xreg_to_claim = (3 + align_mask) & ~align_mask; |
| 1416 | |
| 1417 | DCHECK(csp.Is(__ StackPointer())); |
| 1418 | __ Claim(xreg_to_claim); |
| 1419 | |
| 1420 | // CheckStackGuardState needs the end and start addresses of the input string. |
| 1421 | __ Poke(input_end(), 2 * kPointerSize); |
| 1422 | __ Add(x5, csp, 2 * kPointerSize); |
| 1423 | __ Poke(input_start(), kPointerSize); |
| 1424 | __ Add(x4, csp, kPointerSize); |
| 1425 | |
| 1426 | __ Mov(w3, start_offset()); |
| 1427 | // RegExp code frame pointer. |
| 1428 | __ Mov(x2, frame_pointer()); |
| 1429 | // Code* of self. |
| 1430 | __ Mov(x1, Operand(masm_->CodeObject())); |
| 1431 | |
| 1432 | // We need to pass a pointer to the return address as first argument. |
| 1433 | // The DirectCEntry stub will place the return address on the stack before |
| 1434 | // calling so the stack pointer will point to it. |
| 1435 | __ Mov(x0, csp); |
| 1436 | |
| 1437 | ExternalReference check_stack_guard_state = |
| 1438 | ExternalReference::re_check_stack_guard_state(isolate()); |
| 1439 | __ Mov(scratch, check_stack_guard_state); |
| 1440 | DirectCEntryStub stub(isolate()); |
| 1441 | stub.GenerateCall(masm_, scratch); |
| 1442 | |
| 1443 | // The input string may have been moved in memory, we need to reload it. |
| 1444 | __ Peek(input_start(), kPointerSize); |
| 1445 | __ Peek(input_end(), 2 * kPointerSize); |
| 1446 | |
| 1447 | DCHECK(csp.Is(__ StackPointer())); |
| 1448 | __ Drop(xreg_to_claim); |
| 1449 | |
| 1450 | // Reload the Code pointer. |
| 1451 | __ Mov(code_pointer(), Operand(masm_->CodeObject())); |
| 1452 | } |
| 1453 | |
| 1454 | void RegExpMacroAssemblerARM64::BranchOrBacktrack(Condition condition, |
| 1455 | Label* to) { |
| 1456 | if (condition == al) { // Unconditional. |
| 1457 | if (to == NULL) { |
| 1458 | Backtrack(); |
| 1459 | return; |
| 1460 | } |
| 1461 | __ B(to); |
| 1462 | return; |
| 1463 | } |
| 1464 | if (to == NULL) { |
| 1465 | to = &backtrack_label_; |
| 1466 | } |
| 1467 | __ B(condition, to); |
| 1468 | } |
| 1469 | |
| 1470 | void RegExpMacroAssemblerARM64::CompareAndBranchOrBacktrack(Register reg, |
| 1471 | int immediate, |
| 1472 | Condition condition, |
| 1473 | Label* to) { |
| 1474 | if ((immediate == 0) && ((condition == eq) || (condition == ne))) { |
| 1475 | if (to == NULL) { |
| 1476 | to = &backtrack_label_; |
| 1477 | } |
| 1478 | if (condition == eq) { |
| 1479 | __ Cbz(reg, to); |
| 1480 | } else { |
| 1481 | __ Cbnz(reg, to); |
| 1482 | } |
| 1483 | } else { |
| 1484 | __ Cmp(reg, immediate); |
| 1485 | BranchOrBacktrack(condition, to); |
| 1486 | } |
| 1487 | } |
| 1488 | |
| 1489 | |
| 1490 | void RegExpMacroAssemblerARM64::CheckPreemption() { |
| 1491 | // Check for preemption. |
| 1492 | ExternalReference stack_limit = |
| 1493 | ExternalReference::address_of_stack_limit(isolate()); |
| 1494 | __ Mov(x10, stack_limit); |
| 1495 | __ Ldr(x10, MemOperand(x10)); |
| 1496 | DCHECK(csp.Is(__ StackPointer())); |
| 1497 | __ Cmp(csp, x10); |
| 1498 | CallIf(&check_preempt_label_, ls); |
| 1499 | } |
| 1500 | |
| 1501 | |
| 1502 | void RegExpMacroAssemblerARM64::CheckStackLimit() { |
| 1503 | ExternalReference stack_limit = |
| 1504 | ExternalReference::address_of_regexp_stack_limit(isolate()); |
| 1505 | __ Mov(x10, stack_limit); |
| 1506 | __ Ldr(x10, MemOperand(x10)); |
| 1507 | __ Cmp(backtrack_stackpointer(), x10); |
| 1508 | CallIf(&stack_overflow_label_, ls); |
| 1509 | } |
| 1510 | |
| 1511 | |
| 1512 | void RegExpMacroAssemblerARM64::Push(Register source) { |
| 1513 | DCHECK(source.Is32Bits()); |
| 1514 | DCHECK(!source.is(backtrack_stackpointer())); |
| 1515 | __ Str(source, |
| 1516 | MemOperand(backtrack_stackpointer(), |
| 1517 | -static_cast<int>(kWRegSize), |
| 1518 | PreIndex)); |
| 1519 | } |
| 1520 | |
| 1521 | |
| 1522 | void RegExpMacroAssemblerARM64::Pop(Register target) { |
| 1523 | DCHECK(target.Is32Bits()); |
| 1524 | DCHECK(!target.is(backtrack_stackpointer())); |
| 1525 | __ Ldr(target, |
| 1526 | MemOperand(backtrack_stackpointer(), kWRegSize, PostIndex)); |
| 1527 | } |
| 1528 | |
| 1529 | |
| 1530 | Register RegExpMacroAssemblerARM64::GetCachedRegister(int register_index) { |
| 1531 | DCHECK(register_index < kNumCachedRegisters); |
| 1532 | return Register::Create(register_index / 2, kXRegSizeInBits); |
| 1533 | } |
| 1534 | |
| 1535 | |
| 1536 | Register RegExpMacroAssemblerARM64::GetRegister(int register_index, |
| 1537 | Register maybe_result) { |
| 1538 | DCHECK(maybe_result.Is32Bits()); |
| 1539 | DCHECK(register_index >= 0); |
| 1540 | if (num_registers_ <= register_index) { |
| 1541 | num_registers_ = register_index + 1; |
| 1542 | } |
| 1543 | Register result; |
| 1544 | RegisterState register_state = GetRegisterState(register_index); |
| 1545 | switch (register_state) { |
| 1546 | case STACKED: |
| 1547 | __ Ldr(maybe_result, register_location(register_index)); |
| 1548 | result = maybe_result; |
| 1549 | break; |
| 1550 | case CACHED_LSW: |
| 1551 | result = GetCachedRegister(register_index).W(); |
| 1552 | break; |
| 1553 | case CACHED_MSW: |
| 1554 | __ Lsr(maybe_result.X(), GetCachedRegister(register_index), |
| 1555 | kWRegSizeInBits); |
| 1556 | result = maybe_result; |
| 1557 | break; |
| 1558 | default: |
| 1559 | UNREACHABLE(); |
| 1560 | break; |
| 1561 | } |
| 1562 | DCHECK(result.Is32Bits()); |
| 1563 | return result; |
| 1564 | } |
| 1565 | |
| 1566 | |
| 1567 | void RegExpMacroAssemblerARM64::StoreRegister(int register_index, |
| 1568 | Register source) { |
| 1569 | DCHECK(source.Is32Bits()); |
| 1570 | DCHECK(register_index >= 0); |
| 1571 | if (num_registers_ <= register_index) { |
| 1572 | num_registers_ = register_index + 1; |
| 1573 | } |
| 1574 | |
| 1575 | Register cached_register; |
| 1576 | RegisterState register_state = GetRegisterState(register_index); |
| 1577 | switch (register_state) { |
| 1578 | case STACKED: |
| 1579 | __ Str(source, register_location(register_index)); |
| 1580 | break; |
| 1581 | case CACHED_LSW: |
| 1582 | cached_register = GetCachedRegister(register_index); |
| 1583 | if (!source.Is(cached_register.W())) { |
| 1584 | __ Bfi(cached_register, source.X(), 0, kWRegSizeInBits); |
| 1585 | } |
| 1586 | break; |
| 1587 | case CACHED_MSW: |
| 1588 | cached_register = GetCachedRegister(register_index); |
| 1589 | __ Bfi(cached_register, source.X(), kWRegSizeInBits, kWRegSizeInBits); |
| 1590 | break; |
| 1591 | default: |
| 1592 | UNREACHABLE(); |
| 1593 | break; |
| 1594 | } |
| 1595 | } |
| 1596 | |
| 1597 | |
| 1598 | void RegExpMacroAssemblerARM64::CallIf(Label* to, Condition condition) { |
| 1599 | Label skip_call; |
| 1600 | if (condition != al) __ B(&skip_call, NegateCondition(condition)); |
| 1601 | __ Bl(to); |
| 1602 | __ Bind(&skip_call); |
| 1603 | } |
| 1604 | |
| 1605 | |
| 1606 | void RegExpMacroAssemblerARM64::RestoreLinkRegister() { |
| 1607 | DCHECK(csp.Is(__ StackPointer())); |
| 1608 | __ Pop(lr, xzr); |
| 1609 | __ Add(lr, lr, Operand(masm_->CodeObject())); |
| 1610 | } |
| 1611 | |
| 1612 | |
| 1613 | void RegExpMacroAssemblerARM64::SaveLinkRegister() { |
| 1614 | DCHECK(csp.Is(__ StackPointer())); |
| 1615 | __ Sub(lr, lr, Operand(masm_->CodeObject())); |
| 1616 | __ Push(xzr, lr); |
| 1617 | } |
| 1618 | |
| 1619 | |
| 1620 | MemOperand RegExpMacroAssemblerARM64::register_location(int register_index) { |
| 1621 | DCHECK(register_index < (1<<30)); |
| 1622 | DCHECK(register_index >= kNumCachedRegisters); |
| 1623 | if (num_registers_ <= register_index) { |
| 1624 | num_registers_ = register_index + 1; |
| 1625 | } |
| 1626 | register_index -= kNumCachedRegisters; |
| 1627 | int offset = kFirstRegisterOnStack - register_index * kWRegSize; |
| 1628 | return MemOperand(frame_pointer(), offset); |
| 1629 | } |
| 1630 | |
| 1631 | MemOperand RegExpMacroAssemblerARM64::capture_location(int register_index, |
| 1632 | Register scratch) { |
| 1633 | DCHECK(register_index < (1<<30)); |
| 1634 | DCHECK(register_index < num_saved_registers_); |
| 1635 | DCHECK(register_index >= kNumCachedRegisters); |
| 1636 | DCHECK_EQ(register_index % 2, 0); |
| 1637 | register_index -= kNumCachedRegisters; |
| 1638 | int offset = kFirstCaptureOnStack - register_index * kWRegSize; |
| 1639 | // capture_location is used with Stp instructions to load/store 2 registers. |
| 1640 | // The immediate field in the encoding is limited to 7 bits (signed). |
| 1641 | if (is_int7(offset)) { |
| 1642 | return MemOperand(frame_pointer(), offset); |
| 1643 | } else { |
| 1644 | __ Add(scratch, frame_pointer(), offset); |
| 1645 | return MemOperand(scratch); |
| 1646 | } |
| 1647 | } |
| 1648 | |
| 1649 | void RegExpMacroAssemblerARM64::LoadCurrentCharacterUnchecked(int cp_offset, |
| 1650 | int characters) { |
| 1651 | Register offset = current_input_offset(); |
| 1652 | |
| 1653 | // The ldr, str, ldrh, strh instructions can do unaligned accesses, if the CPU |
| 1654 | // and the operating system running on the target allow it. |
| 1655 | // If unaligned load/stores are not supported then this function must only |
| 1656 | // be used to load a single character at a time. |
| 1657 | |
| 1658 | // ARMv8 supports unaligned accesses but V8 or the kernel can decide to |
| 1659 | // disable it. |
| 1660 | // TODO(pielan): See whether or not we should disable unaligned accesses. |
| 1661 | if (!CanReadUnaligned()) { |
| 1662 | DCHECK(characters == 1); |
| 1663 | } |
| 1664 | |
| 1665 | if (cp_offset != 0) { |
| 1666 | if (masm_->emit_debug_code()) { |
| 1667 | __ Mov(x10, cp_offset * char_size()); |
| 1668 | __ Add(x10, x10, Operand(current_input_offset(), SXTW)); |
| 1669 | __ Cmp(x10, Operand(w10, SXTW)); |
| 1670 | // The offset needs to fit in a W register. |
| 1671 | __ Check(eq, kOffsetOutOfRange); |
| 1672 | } else { |
| 1673 | __ Add(w10, current_input_offset(), cp_offset * char_size()); |
| 1674 | } |
| 1675 | offset = w10; |
| 1676 | } |
| 1677 | |
| 1678 | if (mode_ == LATIN1) { |
| 1679 | if (characters == 4) { |
| 1680 | __ Ldr(current_character(), MemOperand(input_end(), offset, SXTW)); |
| 1681 | } else if (characters == 2) { |
| 1682 | __ Ldrh(current_character(), MemOperand(input_end(), offset, SXTW)); |
| 1683 | } else { |
| 1684 | DCHECK(characters == 1); |
| 1685 | __ Ldrb(current_character(), MemOperand(input_end(), offset, SXTW)); |
| 1686 | } |
| 1687 | } else { |
| 1688 | DCHECK(mode_ == UC16); |
| 1689 | if (characters == 2) { |
| 1690 | __ Ldr(current_character(), MemOperand(input_end(), offset, SXTW)); |
| 1691 | } else { |
| 1692 | DCHECK(characters == 1); |
| 1693 | __ Ldrh(current_character(), MemOperand(input_end(), offset, SXTW)); |
| 1694 | } |
| 1695 | } |
| 1696 | } |
| 1697 | |
| 1698 | #endif // V8_INTERPRETED_REGEXP |
| 1699 | |
| 1700 | }} // namespace v8::internal |
| 1701 | |
| 1702 | #endif // V8_TARGET_ARCH_ARM64 |