Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1 | // Copyright 2014 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 | #if V8_TARGET_ARCH_PPC |
| 6 | |
| 7 | #include "src/regexp/ppc/regexp-macro-assembler-ppc.h" |
| 8 | |
| 9 | #include "src/base/bits.h" |
| 10 | #include "src/code-stubs.h" |
| 11 | #include "src/log.h" |
| 12 | #include "src/macro-assembler.h" |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 13 | #include "src/regexp/regexp-macro-assembler.h" |
| 14 | #include "src/regexp/regexp-stack.h" |
| 15 | #include "src/unicode.h" |
| 16 | |
| 17 | namespace v8 { |
| 18 | namespace internal { |
| 19 | |
| 20 | #ifndef V8_INTERPRETED_REGEXP |
| 21 | /* |
| 22 | * This assembler uses the following register assignment convention |
| 23 | * - r25: Temporarily stores the index of capture start after a matching pass |
| 24 | * for a global regexp. |
| 25 | * - r26: Pointer to current code object (Code*) including heap object tag. |
| 26 | * - r27: Current position in input, as negative offset from end of string. |
| 27 | * Please notice that this is the byte offset, not the character offset! |
| 28 | * - r28: Currently loaded character. Must be loaded using |
| 29 | * LoadCurrentCharacter before using any of the dispatch methods. |
| 30 | * - r29: Points to tip of backtrack stack |
| 31 | * - r30: End of input (points to byte after last character in input). |
| 32 | * - r31: Frame pointer. Used to access arguments, local variables and |
| 33 | * RegExp registers. |
| 34 | * - r12: IP register, used by assembler. Very volatile. |
| 35 | * - r1/sp : Points to tip of C stack. |
| 36 | * |
| 37 | * The remaining registers are free for computations. |
| 38 | * Each call to a public method should retain this convention. |
| 39 | * |
| 40 | * The stack will have the following structure: |
| 41 | * - fp[44] Isolate* isolate (address of the current isolate) |
| 42 | * - fp[40] secondary link/return address used by native call. |
| 43 | * - fp[36] lr save area (currently unused) |
| 44 | * - fp[32] backchain (currently unused) |
| 45 | * --- sp when called --- |
| 46 | * - fp[28] return address (lr). |
| 47 | * - fp[24] old frame pointer (r31). |
| 48 | * - fp[0..20] backup of registers r25..r30 |
| 49 | * --- frame pointer ---- |
| 50 | * - fp[-4] direct_call (if 1, direct call from JavaScript code, |
| 51 | * if 0, call through the runtime system). |
| 52 | * - fp[-8] stack_area_base (high end of the memory area to use as |
| 53 | * backtracking stack). |
| 54 | * - fp[-12] capture array size (may fit multiple sets of matches) |
| 55 | * - fp[-16] int* capture_array (int[num_saved_registers_], for output). |
| 56 | * - fp[-20] end of input (address of end of string). |
| 57 | * - fp[-24] start of input (address of first character in string). |
| 58 | * - fp[-28] start index (character index of start). |
| 59 | * - fp[-32] void* input_string (location of a handle containing the string). |
| 60 | * - fp[-36] success counter (only for global regexps to count matches). |
| 61 | * - fp[-40] Offset of location before start of input (effectively character |
| 62 | * string start - 1). Used to initialize capture registers to a |
| 63 | * non-position. |
| 64 | * - fp[-44] At start (if 1, we are starting at the start of the |
| 65 | * string, otherwise 0) |
| 66 | * - fp[-48] register 0 (Only positions must be stored in the first |
| 67 | * - register 1 num_saved_registers_ registers) |
| 68 | * - ... |
| 69 | * - register num_registers-1 |
| 70 | * --- sp --- |
| 71 | * |
| 72 | * The first num_saved_registers_ registers are initialized to point to |
| 73 | * "character -1" in the string (i.e., char_size() bytes before the first |
| 74 | * character of the string). The remaining registers start out as garbage. |
| 75 | * |
| 76 | * The data up to the return address must be placed there by the calling |
| 77 | * code and the remaining arguments are passed in registers, e.g. by calling the |
| 78 | * code entry as cast to a function with the signature: |
| 79 | * int (*match)(String* input_string, |
| 80 | * int start_index, |
| 81 | * Address start, |
| 82 | * Address end, |
| 83 | * int* capture_output_array, |
| 84 | * byte* stack_area_base, |
| 85 | * Address secondary_return_address, // Only used by native call. |
| 86 | * bool direct_call = false) |
| 87 | * The call is performed by NativeRegExpMacroAssembler::Execute() |
| 88 | * (in regexp-macro-assembler.cc) via the CALL_GENERATED_REGEXP_CODE macro |
| 89 | * in ppc/simulator-ppc.h. |
| 90 | * When calling as a non-direct call (i.e., from C++ code), the return address |
| 91 | * area is overwritten with the LR register by the RegExp code. When doing a |
| 92 | * direct call from generated code, the return address is placed there by |
| 93 | * the calling code, as in a normal exit frame. |
| 94 | */ |
| 95 | |
| 96 | #define __ ACCESS_MASM(masm_) |
| 97 | |
| 98 | RegExpMacroAssemblerPPC::RegExpMacroAssemblerPPC(Isolate* isolate, Zone* zone, |
| 99 | Mode mode, |
| 100 | int registers_to_save) |
| 101 | : NativeRegExpMacroAssembler(isolate, zone), |
| 102 | masm_(new MacroAssembler(isolate, NULL, kRegExpCodeSize, |
| 103 | CodeObjectRequired::kYes)), |
| 104 | mode_(mode), |
| 105 | num_registers_(registers_to_save), |
| 106 | num_saved_registers_(registers_to_save), |
| 107 | entry_label_(), |
| 108 | start_label_(), |
| 109 | success_label_(), |
| 110 | backtrack_label_(), |
| 111 | exit_label_(), |
| 112 | internal_failure_label_() { |
| 113 | DCHECK_EQ(0, registers_to_save % 2); |
| 114 | |
| 115 | // Called from C |
| 116 | __ function_descriptor(); |
| 117 | |
| 118 | __ b(&entry_label_); // We'll write the entry code later. |
| 119 | // If the code gets too big or corrupted, an internal exception will be |
| 120 | // raised, and we will exit right away. |
| 121 | __ bind(&internal_failure_label_); |
| 122 | __ li(r3, Operand(FAILURE)); |
| 123 | __ Ret(); |
| 124 | __ bind(&start_label_); // And then continue from here. |
| 125 | } |
| 126 | |
| 127 | |
| 128 | RegExpMacroAssemblerPPC::~RegExpMacroAssemblerPPC() { |
| 129 | delete masm_; |
| 130 | // Unuse labels in case we throw away the assembler without calling GetCode. |
| 131 | entry_label_.Unuse(); |
| 132 | start_label_.Unuse(); |
| 133 | success_label_.Unuse(); |
| 134 | backtrack_label_.Unuse(); |
| 135 | exit_label_.Unuse(); |
| 136 | check_preempt_label_.Unuse(); |
| 137 | stack_overflow_label_.Unuse(); |
| 138 | internal_failure_label_.Unuse(); |
| 139 | } |
| 140 | |
| 141 | |
| 142 | int RegExpMacroAssemblerPPC::stack_limit_slack() { |
| 143 | return RegExpStack::kStackLimitSlack; |
| 144 | } |
| 145 | |
| 146 | |
| 147 | void RegExpMacroAssemblerPPC::AdvanceCurrentPosition(int by) { |
| 148 | if (by != 0) { |
| 149 | __ addi(current_input_offset(), current_input_offset(), |
| 150 | Operand(by * char_size())); |
| 151 | } |
| 152 | } |
| 153 | |
| 154 | |
| 155 | void RegExpMacroAssemblerPPC::AdvanceRegister(int reg, int by) { |
| 156 | DCHECK(reg >= 0); |
| 157 | DCHECK(reg < num_registers_); |
| 158 | if (by != 0) { |
| 159 | __ LoadP(r3, register_location(reg), r0); |
| 160 | __ mov(r0, Operand(by)); |
| 161 | __ add(r3, r3, r0); |
| 162 | __ StoreP(r3, register_location(reg), r0); |
| 163 | } |
| 164 | } |
| 165 | |
| 166 | |
| 167 | void RegExpMacroAssemblerPPC::Backtrack() { |
| 168 | CheckPreemption(); |
| 169 | // Pop Code* offset from backtrack stack, add Code* and jump to location. |
| 170 | Pop(r3); |
| 171 | __ add(r3, r3, code_pointer()); |
| 172 | __ Jump(r3); |
| 173 | } |
| 174 | |
| 175 | |
| 176 | void RegExpMacroAssemblerPPC::Bind(Label* label) { __ bind(label); } |
| 177 | |
| 178 | |
| 179 | void RegExpMacroAssemblerPPC::CheckCharacter(uint32_t c, Label* on_equal) { |
| 180 | __ Cmpli(current_character(), Operand(c), r0); |
| 181 | BranchOrBacktrack(eq, on_equal); |
| 182 | } |
| 183 | |
| 184 | |
| 185 | void RegExpMacroAssemblerPPC::CheckCharacterGT(uc16 limit, Label* on_greater) { |
| 186 | __ Cmpli(current_character(), Operand(limit), r0); |
| 187 | BranchOrBacktrack(gt, on_greater); |
| 188 | } |
| 189 | |
| 190 | |
| 191 | void RegExpMacroAssemblerPPC::CheckAtStart(Label* on_at_start) { |
| 192 | __ LoadP(r4, MemOperand(frame_pointer(), kStringStartMinusOne)); |
| 193 | __ addi(r3, current_input_offset(), Operand(-char_size())); |
| 194 | __ cmp(r3, r4); |
| 195 | BranchOrBacktrack(eq, on_at_start); |
| 196 | } |
| 197 | |
| 198 | |
| 199 | void RegExpMacroAssemblerPPC::CheckNotAtStart(int cp_offset, |
| 200 | Label* on_not_at_start) { |
| 201 | __ LoadP(r4, MemOperand(frame_pointer(), kStringStartMinusOne)); |
| 202 | __ addi(r3, current_input_offset(), |
| 203 | Operand(-char_size() + cp_offset * char_size())); |
| 204 | __ cmp(r3, r4); |
| 205 | BranchOrBacktrack(ne, on_not_at_start); |
| 206 | } |
| 207 | |
| 208 | |
| 209 | void RegExpMacroAssemblerPPC::CheckCharacterLT(uc16 limit, Label* on_less) { |
| 210 | __ Cmpli(current_character(), Operand(limit), r0); |
| 211 | BranchOrBacktrack(lt, on_less); |
| 212 | } |
| 213 | |
| 214 | |
| 215 | void RegExpMacroAssemblerPPC::CheckGreedyLoop(Label* on_equal) { |
| 216 | Label backtrack_non_equal; |
| 217 | __ LoadP(r3, MemOperand(backtrack_stackpointer(), 0)); |
| 218 | __ cmp(current_input_offset(), r3); |
| 219 | __ bne(&backtrack_non_equal); |
| 220 | __ addi(backtrack_stackpointer(), backtrack_stackpointer(), |
| 221 | Operand(kPointerSize)); |
| 222 | |
| 223 | __ bind(&backtrack_non_equal); |
| 224 | BranchOrBacktrack(eq, on_equal); |
| 225 | } |
| 226 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 227 | void RegExpMacroAssemblerPPC::CheckNotBackReferenceIgnoreCase( |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 228 | int start_reg, bool read_backward, bool unicode, Label* on_no_match) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 229 | Label fallthrough; |
| 230 | __ LoadP(r3, register_location(start_reg), r0); // Index of start of capture |
| 231 | __ LoadP(r4, register_location(start_reg + 1), r0); // Index of end |
| 232 | __ sub(r4, r4, r3, LeaveOE, SetRC); // Length of capture. |
| 233 | |
| 234 | // At this point, the capture registers are either both set or both cleared. |
| 235 | // If the capture length is zero, then the capture is either empty or cleared. |
| 236 | // Fall through in both cases. |
| 237 | __ beq(&fallthrough, cr0); |
| 238 | |
| 239 | // Check that there are enough characters left in the input. |
| 240 | if (read_backward) { |
| 241 | __ LoadP(r6, MemOperand(frame_pointer(), kStringStartMinusOne)); |
| 242 | __ add(r6, r6, r4); |
| 243 | __ cmp(current_input_offset(), r6); |
| 244 | BranchOrBacktrack(le, on_no_match); |
| 245 | } else { |
| 246 | __ add(r0, r4, current_input_offset(), LeaveOE, SetRC); |
| 247 | BranchOrBacktrack(gt, on_no_match, cr0); |
| 248 | } |
| 249 | |
| 250 | if (mode_ == LATIN1) { |
| 251 | Label success; |
| 252 | Label fail; |
| 253 | Label loop_check; |
| 254 | |
| 255 | // r3 - offset of start of capture |
| 256 | // r4 - length of capture |
| 257 | __ add(r3, r3, end_of_input_address()); |
| 258 | __ add(r5, end_of_input_address(), current_input_offset()); |
| 259 | if (read_backward) { |
| 260 | __ sub(r5, r5, r4); // Offset by length when matching backwards. |
| 261 | } |
| 262 | __ add(r4, r3, r4); |
| 263 | |
| 264 | // r3 - Address of start of capture. |
| 265 | // r4 - Address of end of capture |
| 266 | // r5 - Address of current input position. |
| 267 | |
| 268 | Label loop; |
| 269 | __ bind(&loop); |
| 270 | __ lbz(r6, MemOperand(r3)); |
| 271 | __ addi(r3, r3, Operand(char_size())); |
| 272 | __ lbz(r25, MemOperand(r5)); |
| 273 | __ addi(r5, r5, Operand(char_size())); |
| 274 | __ cmp(r25, r6); |
| 275 | __ beq(&loop_check); |
| 276 | |
| 277 | // Mismatch, try case-insensitive match (converting letters to lower-case). |
| 278 | __ ori(r6, r6, Operand(0x20)); // Convert capture character to lower-case. |
| 279 | __ ori(r25, r25, Operand(0x20)); // Also convert input character. |
| 280 | __ cmp(r25, r6); |
| 281 | __ bne(&fail); |
| 282 | __ subi(r6, r6, Operand('a')); |
| 283 | __ cmpli(r6, Operand('z' - 'a')); // Is r6 a lowercase letter? |
| 284 | __ ble(&loop_check); // In range 'a'-'z'. |
| 285 | // Latin-1: Check for values in range [224,254] but not 247. |
| 286 | __ subi(r6, r6, Operand(224 - 'a')); |
| 287 | __ cmpli(r6, Operand(254 - 224)); |
| 288 | __ bgt(&fail); // Weren't Latin-1 letters. |
| 289 | __ cmpi(r6, Operand(247 - 224)); // Check for 247. |
| 290 | __ beq(&fail); |
| 291 | |
| 292 | __ bind(&loop_check); |
| 293 | __ cmp(r3, r4); |
| 294 | __ blt(&loop); |
| 295 | __ b(&success); |
| 296 | |
| 297 | __ bind(&fail); |
| 298 | BranchOrBacktrack(al, on_no_match); |
| 299 | |
| 300 | __ bind(&success); |
| 301 | // Compute new value of character position after the matched part. |
| 302 | __ sub(current_input_offset(), r5, end_of_input_address()); |
| 303 | if (read_backward) { |
| 304 | __ LoadP(r3, register_location(start_reg)); // Index of start of capture |
| 305 | __ LoadP(r4, |
| 306 | register_location(start_reg + 1)); // Index of end of capture |
| 307 | __ add(current_input_offset(), current_input_offset(), r3); |
| 308 | __ sub(current_input_offset(), current_input_offset(), r4); |
| 309 | } |
| 310 | } else { |
| 311 | DCHECK(mode_ == UC16); |
| 312 | int argument_count = 4; |
| 313 | __ PrepareCallCFunction(argument_count, r5); |
| 314 | |
| 315 | // r3 - offset of start of capture |
| 316 | // r4 - length of capture |
| 317 | |
| 318 | // Put arguments into arguments registers. |
| 319 | // Parameters are |
| 320 | // r3: Address byte_offset1 - Address captured substring's start. |
| 321 | // r4: Address byte_offset2 - Address of current character position. |
| 322 | // r5: size_t byte_length - length of capture in bytes(!) |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 323 | // r6: Isolate* isolate or 0 if unicode flag. |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 324 | |
| 325 | // Address of start of capture. |
| 326 | __ add(r3, r3, end_of_input_address()); |
| 327 | // Length of capture. |
| 328 | __ mr(r5, r4); |
| 329 | // Save length in callee-save register for use on return. |
| 330 | __ mr(r25, r4); |
| 331 | // Address of current input position. |
| 332 | __ add(r4, current_input_offset(), end_of_input_address()); |
| 333 | if (read_backward) { |
| 334 | __ sub(r4, r4, r25); |
| 335 | } |
| 336 | // Isolate. |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 337 | #ifdef V8_I18N_SUPPORT |
| 338 | if (unicode) { |
| 339 | __ li(r6, Operand::Zero()); |
| 340 | } else // NOLINT |
| 341 | #endif // V8_I18N_SUPPORT |
| 342 | { |
| 343 | __ mov(r6, Operand(ExternalReference::isolate_address(isolate()))); |
| 344 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 345 | |
| 346 | { |
| 347 | AllowExternalCallThatCantCauseGC scope(masm_); |
| 348 | ExternalReference function = |
| 349 | ExternalReference::re_case_insensitive_compare_uc16(isolate()); |
| 350 | __ CallCFunction(function, argument_count); |
| 351 | } |
| 352 | |
| 353 | // Check if function returned non-zero for success or zero for failure. |
| 354 | __ cmpi(r3, Operand::Zero()); |
| 355 | BranchOrBacktrack(eq, on_no_match); |
| 356 | |
| 357 | // On success, advance position by length of capture. |
| 358 | if (read_backward) { |
| 359 | __ sub(current_input_offset(), current_input_offset(), r25); |
| 360 | } else { |
| 361 | __ add(current_input_offset(), current_input_offset(), r25); |
| 362 | } |
| 363 | } |
| 364 | |
| 365 | __ bind(&fallthrough); |
| 366 | } |
| 367 | |
| 368 | |
| 369 | void RegExpMacroAssemblerPPC::CheckNotBackReference(int start_reg, |
| 370 | bool read_backward, |
| 371 | Label* on_no_match) { |
| 372 | Label fallthrough; |
| 373 | Label success; |
| 374 | |
| 375 | // Find length of back-referenced capture. |
| 376 | __ LoadP(r3, register_location(start_reg), r0); |
| 377 | __ LoadP(r4, register_location(start_reg + 1), r0); |
| 378 | __ sub(r4, r4, r3, LeaveOE, SetRC); // Length to check. |
| 379 | |
| 380 | // At this point, the capture registers are either both set or both cleared. |
| 381 | // If the capture length is zero, then the capture is either empty or cleared. |
| 382 | // Fall through in both cases. |
| 383 | __ beq(&fallthrough, cr0); |
| 384 | |
| 385 | // Check that there are enough characters left in the input. |
| 386 | if (read_backward) { |
| 387 | __ LoadP(r6, MemOperand(frame_pointer(), kStringStartMinusOne)); |
| 388 | __ add(r6, r6, r4); |
| 389 | __ cmp(current_input_offset(), r6); |
| 390 | BranchOrBacktrack(lt, on_no_match); |
| 391 | } else { |
| 392 | __ add(r0, r4, current_input_offset(), LeaveOE, SetRC); |
| 393 | BranchOrBacktrack(gt, on_no_match, cr0); |
| 394 | } |
| 395 | |
| 396 | // r3 - offset of start of capture |
| 397 | // r4 - length of capture |
| 398 | __ add(r3, r3, end_of_input_address()); |
| 399 | __ add(r5, end_of_input_address(), current_input_offset()); |
| 400 | if (read_backward) { |
| 401 | __ sub(r5, r5, r4); // Offset by length when matching backwards. |
| 402 | } |
| 403 | __ add(r4, r4, r3); |
| 404 | |
| 405 | Label loop; |
| 406 | __ bind(&loop); |
| 407 | if (mode_ == LATIN1) { |
| 408 | __ lbz(r6, MemOperand(r3)); |
| 409 | __ addi(r3, r3, Operand(char_size())); |
| 410 | __ lbz(r25, MemOperand(r5)); |
| 411 | __ addi(r5, r5, Operand(char_size())); |
| 412 | } else { |
| 413 | DCHECK(mode_ == UC16); |
| 414 | __ lhz(r6, MemOperand(r3)); |
| 415 | __ addi(r3, r3, Operand(char_size())); |
| 416 | __ lhz(r25, MemOperand(r5)); |
| 417 | __ addi(r5, r5, Operand(char_size())); |
| 418 | } |
| 419 | __ cmp(r6, r25); |
| 420 | BranchOrBacktrack(ne, on_no_match); |
| 421 | __ cmp(r3, r4); |
| 422 | __ blt(&loop); |
| 423 | |
| 424 | // Move current character position to position after match. |
| 425 | __ sub(current_input_offset(), r5, end_of_input_address()); |
| 426 | if (read_backward) { |
| 427 | __ LoadP(r3, register_location(start_reg)); // Index of start of capture |
| 428 | __ LoadP(r4, register_location(start_reg + 1)); // Index of end of capture |
| 429 | __ add(current_input_offset(), current_input_offset(), r3); |
| 430 | __ sub(current_input_offset(), current_input_offset(), r4); |
| 431 | } |
| 432 | |
| 433 | __ bind(&fallthrough); |
| 434 | } |
| 435 | |
| 436 | |
| 437 | void RegExpMacroAssemblerPPC::CheckNotCharacter(unsigned c, |
| 438 | Label* on_not_equal) { |
| 439 | __ Cmpli(current_character(), Operand(c), r0); |
| 440 | BranchOrBacktrack(ne, on_not_equal); |
| 441 | } |
| 442 | |
| 443 | |
| 444 | void RegExpMacroAssemblerPPC::CheckCharacterAfterAnd(uint32_t c, uint32_t mask, |
| 445 | Label* on_equal) { |
| 446 | __ mov(r0, Operand(mask)); |
| 447 | if (c == 0) { |
| 448 | __ and_(r3, current_character(), r0, SetRC); |
| 449 | } else { |
| 450 | __ and_(r3, current_character(), r0); |
| 451 | __ Cmpli(r3, Operand(c), r0, cr0); |
| 452 | } |
| 453 | BranchOrBacktrack(eq, on_equal, cr0); |
| 454 | } |
| 455 | |
| 456 | |
| 457 | void RegExpMacroAssemblerPPC::CheckNotCharacterAfterAnd(unsigned c, |
| 458 | unsigned mask, |
| 459 | Label* on_not_equal) { |
| 460 | __ mov(r0, Operand(mask)); |
| 461 | if (c == 0) { |
| 462 | __ and_(r3, current_character(), r0, SetRC); |
| 463 | } else { |
| 464 | __ and_(r3, current_character(), r0); |
| 465 | __ Cmpli(r3, Operand(c), r0, cr0); |
| 466 | } |
| 467 | BranchOrBacktrack(ne, on_not_equal, cr0); |
| 468 | } |
| 469 | |
| 470 | |
| 471 | void RegExpMacroAssemblerPPC::CheckNotCharacterAfterMinusAnd( |
| 472 | uc16 c, uc16 minus, uc16 mask, Label* on_not_equal) { |
| 473 | DCHECK(minus < String::kMaxUtf16CodeUnit); |
| 474 | __ subi(r3, current_character(), Operand(minus)); |
| 475 | __ mov(r0, Operand(mask)); |
| 476 | __ and_(r3, r3, r0); |
| 477 | __ Cmpli(r3, Operand(c), r0); |
| 478 | BranchOrBacktrack(ne, on_not_equal); |
| 479 | } |
| 480 | |
| 481 | |
| 482 | void RegExpMacroAssemblerPPC::CheckCharacterInRange(uc16 from, uc16 to, |
| 483 | Label* on_in_range) { |
| 484 | __ mov(r0, Operand(from)); |
| 485 | __ sub(r3, current_character(), r0); |
| 486 | __ Cmpli(r3, Operand(to - from), r0); |
| 487 | BranchOrBacktrack(le, on_in_range); // Unsigned lower-or-same condition. |
| 488 | } |
| 489 | |
| 490 | |
| 491 | void RegExpMacroAssemblerPPC::CheckCharacterNotInRange(uc16 from, uc16 to, |
| 492 | Label* on_not_in_range) { |
| 493 | __ mov(r0, Operand(from)); |
| 494 | __ sub(r3, current_character(), r0); |
| 495 | __ Cmpli(r3, Operand(to - from), r0); |
| 496 | BranchOrBacktrack(gt, on_not_in_range); // Unsigned higher condition. |
| 497 | } |
| 498 | |
| 499 | |
| 500 | void RegExpMacroAssemblerPPC::CheckBitInTable(Handle<ByteArray> table, |
| 501 | Label* on_bit_set) { |
| 502 | __ mov(r3, Operand(table)); |
| 503 | if (mode_ != LATIN1 || kTableMask != String::kMaxOneByteCharCode) { |
| 504 | __ andi(r4, current_character(), Operand(kTableSize - 1)); |
| 505 | __ addi(r4, r4, Operand(ByteArray::kHeaderSize - kHeapObjectTag)); |
| 506 | } else { |
| 507 | __ addi(r4, current_character(), |
| 508 | Operand(ByteArray::kHeaderSize - kHeapObjectTag)); |
| 509 | } |
| 510 | __ lbzx(r3, MemOperand(r3, r4)); |
| 511 | __ cmpi(r3, Operand::Zero()); |
| 512 | BranchOrBacktrack(ne, on_bit_set); |
| 513 | } |
| 514 | |
| 515 | |
| 516 | bool RegExpMacroAssemblerPPC::CheckSpecialCharacterClass(uc16 type, |
| 517 | Label* on_no_match) { |
| 518 | // Range checks (c in min..max) are generally implemented by an unsigned |
| 519 | // (c - min) <= (max - min) check |
| 520 | switch (type) { |
| 521 | case 's': |
| 522 | // Match space-characters |
| 523 | if (mode_ == LATIN1) { |
| 524 | // One byte space characters are '\t'..'\r', ' ' and \u00a0. |
| 525 | Label success; |
| 526 | __ cmpi(current_character(), Operand(' ')); |
| 527 | __ beq(&success); |
| 528 | // Check range 0x09..0x0d |
| 529 | __ subi(r3, current_character(), Operand('\t')); |
| 530 | __ cmpli(r3, Operand('\r' - '\t')); |
| 531 | __ ble(&success); |
| 532 | // \u00a0 (NBSP). |
| 533 | __ cmpi(r3, Operand(0x00a0 - '\t')); |
| 534 | BranchOrBacktrack(ne, on_no_match); |
| 535 | __ bind(&success); |
| 536 | return true; |
| 537 | } |
| 538 | return false; |
| 539 | case 'S': |
| 540 | // The emitted code for generic character classes is good enough. |
| 541 | return false; |
| 542 | case 'd': |
| 543 | // Match ASCII digits ('0'..'9') |
| 544 | __ subi(r3, current_character(), Operand('0')); |
| 545 | __ cmpli(r3, Operand('9' - '0')); |
| 546 | BranchOrBacktrack(gt, on_no_match); |
| 547 | return true; |
| 548 | case 'D': |
| 549 | // Match non ASCII-digits |
| 550 | __ subi(r3, current_character(), Operand('0')); |
| 551 | __ cmpli(r3, Operand('9' - '0')); |
| 552 | BranchOrBacktrack(le, on_no_match); |
| 553 | return true; |
| 554 | case '.': { |
| 555 | // Match non-newlines (not 0x0a('\n'), 0x0d('\r'), 0x2028 and 0x2029) |
| 556 | __ xori(r3, current_character(), Operand(0x01)); |
| 557 | // See if current character is '\n'^1 or '\r'^1, i.e., 0x0b or 0x0c |
| 558 | __ subi(r3, r3, Operand(0x0b)); |
| 559 | __ cmpli(r3, Operand(0x0c - 0x0b)); |
| 560 | BranchOrBacktrack(le, on_no_match); |
| 561 | if (mode_ == UC16) { |
| 562 | // Compare original value to 0x2028 and 0x2029, using the already |
| 563 | // computed (current_char ^ 0x01 - 0x0b). I.e., check for |
| 564 | // 0x201d (0x2028 - 0x0b) or 0x201e. |
| 565 | __ subi(r3, r3, Operand(0x2028 - 0x0b)); |
| 566 | __ cmpli(r3, Operand(1)); |
| 567 | BranchOrBacktrack(le, on_no_match); |
| 568 | } |
| 569 | return true; |
| 570 | } |
| 571 | case 'n': { |
| 572 | // Match newlines (0x0a('\n'), 0x0d('\r'), 0x2028 and 0x2029) |
| 573 | __ xori(r3, current_character(), Operand(0x01)); |
| 574 | // See if current character is '\n'^1 or '\r'^1, i.e., 0x0b or 0x0c |
| 575 | __ subi(r3, r3, Operand(0x0b)); |
| 576 | __ cmpli(r3, Operand(0x0c - 0x0b)); |
| 577 | if (mode_ == LATIN1) { |
| 578 | BranchOrBacktrack(gt, on_no_match); |
| 579 | } else { |
| 580 | Label done; |
| 581 | __ ble(&done); |
| 582 | // Compare original value to 0x2028 and 0x2029, using the already |
| 583 | // computed (current_char ^ 0x01 - 0x0b). I.e., check for |
| 584 | // 0x201d (0x2028 - 0x0b) or 0x201e. |
| 585 | __ subi(r3, r3, Operand(0x2028 - 0x0b)); |
| 586 | __ cmpli(r3, Operand(1)); |
| 587 | BranchOrBacktrack(gt, on_no_match); |
| 588 | __ bind(&done); |
| 589 | } |
| 590 | return true; |
| 591 | } |
| 592 | case 'w': { |
| 593 | if (mode_ != LATIN1) { |
| 594 | // Table is 256 entries, so all Latin1 characters can be tested. |
| 595 | __ cmpi(current_character(), Operand('z')); |
| 596 | BranchOrBacktrack(gt, on_no_match); |
| 597 | } |
| 598 | ExternalReference map = ExternalReference::re_word_character_map(); |
| 599 | __ mov(r3, Operand(map)); |
| 600 | __ lbzx(r3, MemOperand(r3, current_character())); |
| 601 | __ cmpli(r3, Operand::Zero()); |
| 602 | BranchOrBacktrack(eq, on_no_match); |
| 603 | return true; |
| 604 | } |
| 605 | case 'W': { |
| 606 | Label done; |
| 607 | if (mode_ != LATIN1) { |
| 608 | // Table is 256 entries, so all Latin1 characters can be tested. |
| 609 | __ cmpli(current_character(), Operand('z')); |
| 610 | __ bgt(&done); |
| 611 | } |
| 612 | ExternalReference map = ExternalReference::re_word_character_map(); |
| 613 | __ mov(r3, Operand(map)); |
| 614 | __ lbzx(r3, MemOperand(r3, current_character())); |
| 615 | __ cmpli(r3, Operand::Zero()); |
| 616 | BranchOrBacktrack(ne, on_no_match); |
| 617 | if (mode_ != LATIN1) { |
| 618 | __ bind(&done); |
| 619 | } |
| 620 | return true; |
| 621 | } |
| 622 | case '*': |
| 623 | // Match any character. |
| 624 | return true; |
| 625 | // No custom implementation (yet): s(UC16), S(UC16). |
| 626 | default: |
| 627 | return false; |
| 628 | } |
| 629 | } |
| 630 | |
| 631 | |
| 632 | void RegExpMacroAssemblerPPC::Fail() { |
| 633 | __ li(r3, Operand(FAILURE)); |
| 634 | __ b(&exit_label_); |
| 635 | } |
| 636 | |
| 637 | |
| 638 | Handle<HeapObject> RegExpMacroAssemblerPPC::GetCode(Handle<String> source) { |
| 639 | Label return_r3; |
| 640 | |
| 641 | if (masm_->has_exception()) { |
| 642 | // If the code gets corrupted due to long regular expressions and lack of |
| 643 | // space on trampolines, an internal exception flag is set. If this case |
| 644 | // is detected, we will jump into exit sequence right away. |
| 645 | __ bind_to(&entry_label_, internal_failure_label_.pos()); |
| 646 | } else { |
| 647 | // Finalize code - write the entry point code now we know how many |
| 648 | // registers we need. |
| 649 | |
| 650 | // Entry code: |
| 651 | __ bind(&entry_label_); |
| 652 | |
| 653 | // Tell the system that we have a stack frame. Because the type |
| 654 | // is MANUAL, no is generated. |
| 655 | FrameScope scope(masm_, StackFrame::MANUAL); |
| 656 | |
| 657 | // Ensure register assigments are consistent with callee save mask |
| 658 | DCHECK(r25.bit() & kRegExpCalleeSaved); |
| 659 | DCHECK(code_pointer().bit() & kRegExpCalleeSaved); |
| 660 | DCHECK(current_input_offset().bit() & kRegExpCalleeSaved); |
| 661 | DCHECK(current_character().bit() & kRegExpCalleeSaved); |
| 662 | DCHECK(backtrack_stackpointer().bit() & kRegExpCalleeSaved); |
| 663 | DCHECK(end_of_input_address().bit() & kRegExpCalleeSaved); |
| 664 | DCHECK(frame_pointer().bit() & kRegExpCalleeSaved); |
| 665 | |
| 666 | // Actually emit code to start a new stack frame. |
| 667 | // Push arguments |
| 668 | // Save callee-save registers. |
| 669 | // Start new stack frame. |
| 670 | // Store link register in existing stack-cell. |
| 671 | // Order here should correspond to order of offset constants in header file. |
| 672 | RegList registers_to_retain = kRegExpCalleeSaved; |
| 673 | RegList argument_registers = r3.bit() | r4.bit() | r5.bit() | r6.bit() | |
| 674 | r7.bit() | r8.bit() | r9.bit() | r10.bit(); |
| 675 | __ mflr(r0); |
| 676 | __ push(r0); |
| 677 | __ MultiPush(argument_registers | registers_to_retain); |
| 678 | // Set frame pointer in space for it if this is not a direct call |
| 679 | // from generated code. |
| 680 | __ addi(frame_pointer(), sp, Operand(8 * kPointerSize)); |
| 681 | __ li(r3, Operand::Zero()); |
| 682 | __ push(r3); // Make room for success counter and initialize it to 0. |
| 683 | __ push(r3); // Make room for "string start - 1" constant. |
| 684 | // Check if we have space on the stack for registers. |
| 685 | Label stack_limit_hit; |
| 686 | Label stack_ok; |
| 687 | |
| 688 | ExternalReference stack_limit = |
| 689 | ExternalReference::address_of_stack_limit(isolate()); |
| 690 | __ mov(r3, Operand(stack_limit)); |
| 691 | __ LoadP(r3, MemOperand(r3)); |
| 692 | __ sub(r3, sp, r3, LeaveOE, SetRC); |
| 693 | // Handle it if the stack pointer is already below the stack limit. |
| 694 | __ ble(&stack_limit_hit, cr0); |
| 695 | // Check if there is room for the variable number of registers above |
| 696 | // the stack limit. |
| 697 | __ Cmpli(r3, Operand(num_registers_ * kPointerSize), r0); |
| 698 | __ bge(&stack_ok); |
| 699 | // Exit with OutOfMemory exception. There is not enough space on the stack |
| 700 | // for our working registers. |
| 701 | __ li(r3, Operand(EXCEPTION)); |
| 702 | __ b(&return_r3); |
| 703 | |
| 704 | __ bind(&stack_limit_hit); |
| 705 | CallCheckStackGuardState(r3); |
| 706 | __ cmpi(r3, Operand::Zero()); |
| 707 | // If returned value is non-zero, we exit with the returned value as result. |
| 708 | __ bne(&return_r3); |
| 709 | |
| 710 | __ bind(&stack_ok); |
| 711 | |
| 712 | // Allocate space on stack for registers. |
| 713 | __ Add(sp, sp, -num_registers_ * kPointerSize, r0); |
| 714 | // Load string end. |
| 715 | __ LoadP(end_of_input_address(), MemOperand(frame_pointer(), kInputEnd)); |
| 716 | // Load input start. |
| 717 | __ LoadP(r3, MemOperand(frame_pointer(), kInputStart)); |
| 718 | // Find negative length (offset of start relative to end). |
| 719 | __ sub(current_input_offset(), r3, end_of_input_address()); |
| 720 | // Set r3 to address of char before start of the input string |
| 721 | // (effectively string position -1). |
| 722 | __ LoadP(r4, MemOperand(frame_pointer(), kStartIndex)); |
| 723 | __ subi(r3, current_input_offset(), Operand(char_size())); |
| 724 | if (mode_ == UC16) { |
| 725 | __ ShiftLeftImm(r0, r4, Operand(1)); |
| 726 | __ sub(r3, r3, r0); |
| 727 | } else { |
| 728 | __ sub(r3, r3, r4); |
| 729 | } |
| 730 | // Store this value in a local variable, for use when clearing |
| 731 | // position registers. |
| 732 | __ StoreP(r3, MemOperand(frame_pointer(), kStringStartMinusOne)); |
| 733 | |
| 734 | // Initialize code pointer register |
| 735 | __ mov(code_pointer(), Operand(masm_->CodeObject())); |
| 736 | |
| 737 | Label load_char_start_regexp, start_regexp; |
| 738 | // Load newline if index is at start, previous character otherwise. |
| 739 | __ cmpi(r4, Operand::Zero()); |
| 740 | __ bne(&load_char_start_regexp); |
| 741 | __ li(current_character(), Operand('\n')); |
| 742 | __ b(&start_regexp); |
| 743 | |
| 744 | // Global regexp restarts matching here. |
| 745 | __ bind(&load_char_start_regexp); |
| 746 | // Load previous char as initial value of current character register. |
| 747 | LoadCurrentCharacterUnchecked(-1, 1); |
| 748 | __ bind(&start_regexp); |
| 749 | |
| 750 | // Initialize on-stack registers. |
| 751 | if (num_saved_registers_ > 0) { // Always is, if generated from a regexp. |
| 752 | // Fill saved registers with initial value = start offset - 1 |
| 753 | if (num_saved_registers_ > 8) { |
| 754 | // One slot beyond address of register 0. |
| 755 | __ addi(r4, frame_pointer(), Operand(kRegisterZero + kPointerSize)); |
| 756 | __ li(r5, Operand(num_saved_registers_)); |
| 757 | __ mtctr(r5); |
| 758 | Label init_loop; |
| 759 | __ bind(&init_loop); |
| 760 | __ StorePU(r3, MemOperand(r4, -kPointerSize)); |
| 761 | __ bdnz(&init_loop); |
| 762 | } else { |
| 763 | for (int i = 0; i < num_saved_registers_; i++) { |
| 764 | __ StoreP(r3, register_location(i), r0); |
| 765 | } |
| 766 | } |
| 767 | } |
| 768 | |
| 769 | // Initialize backtrack stack pointer. |
| 770 | __ LoadP(backtrack_stackpointer(), |
| 771 | MemOperand(frame_pointer(), kStackHighEnd)); |
| 772 | |
| 773 | __ b(&start_label_); |
| 774 | |
| 775 | // Exit code: |
| 776 | if (success_label_.is_linked()) { |
| 777 | // Save captures when successful. |
| 778 | __ bind(&success_label_); |
| 779 | if (num_saved_registers_ > 0) { |
| 780 | // copy captures to output |
| 781 | __ LoadP(r4, MemOperand(frame_pointer(), kInputStart)); |
| 782 | __ LoadP(r3, MemOperand(frame_pointer(), kRegisterOutput)); |
| 783 | __ LoadP(r5, MemOperand(frame_pointer(), kStartIndex)); |
| 784 | __ sub(r4, end_of_input_address(), r4); |
| 785 | // r4 is length of input in bytes. |
| 786 | if (mode_ == UC16) { |
| 787 | __ ShiftRightImm(r4, r4, Operand(1)); |
| 788 | } |
| 789 | // r4 is length of input in characters. |
| 790 | __ add(r4, r4, r5); |
| 791 | // r4 is length of string in characters. |
| 792 | |
| 793 | DCHECK_EQ(0, num_saved_registers_ % 2); |
| 794 | // Always an even number of capture registers. This allows us to |
| 795 | // unroll the loop once to add an operation between a load of a register |
| 796 | // and the following use of that register. |
| 797 | for (int i = 0; i < num_saved_registers_; i += 2) { |
| 798 | __ LoadP(r5, register_location(i), r0); |
| 799 | __ LoadP(r6, register_location(i + 1), r0); |
| 800 | if (i == 0 && global_with_zero_length_check()) { |
| 801 | // Keep capture start in r25 for the zero-length check later. |
| 802 | __ mr(r25, r5); |
| 803 | } |
| 804 | if (mode_ == UC16) { |
| 805 | __ ShiftRightArithImm(r5, r5, 1); |
| 806 | __ add(r5, r4, r5); |
| 807 | __ ShiftRightArithImm(r6, r6, 1); |
| 808 | __ add(r6, r4, r6); |
| 809 | } else { |
| 810 | __ add(r5, r4, r5); |
| 811 | __ add(r6, r4, r6); |
| 812 | } |
| 813 | __ stw(r5, MemOperand(r3)); |
| 814 | __ addi(r3, r3, Operand(kIntSize)); |
| 815 | __ stw(r6, MemOperand(r3)); |
| 816 | __ addi(r3, r3, Operand(kIntSize)); |
| 817 | } |
| 818 | } |
| 819 | |
| 820 | if (global()) { |
| 821 | // Restart matching if the regular expression is flagged as global. |
| 822 | __ LoadP(r3, MemOperand(frame_pointer(), kSuccessfulCaptures)); |
| 823 | __ LoadP(r4, MemOperand(frame_pointer(), kNumOutputRegisters)); |
| 824 | __ LoadP(r5, MemOperand(frame_pointer(), kRegisterOutput)); |
| 825 | // Increment success counter. |
| 826 | __ addi(r3, r3, Operand(1)); |
| 827 | __ StoreP(r3, MemOperand(frame_pointer(), kSuccessfulCaptures)); |
| 828 | // Capture results have been stored, so the number of remaining global |
| 829 | // output registers is reduced by the number of stored captures. |
| 830 | __ subi(r4, r4, Operand(num_saved_registers_)); |
| 831 | // Check whether we have enough room for another set of capture results. |
| 832 | __ cmpi(r4, Operand(num_saved_registers_)); |
| 833 | __ blt(&return_r3); |
| 834 | |
| 835 | __ StoreP(r4, MemOperand(frame_pointer(), kNumOutputRegisters)); |
| 836 | // Advance the location for output. |
| 837 | __ addi(r5, r5, Operand(num_saved_registers_ * kIntSize)); |
| 838 | __ StoreP(r5, MemOperand(frame_pointer(), kRegisterOutput)); |
| 839 | |
| 840 | // Prepare r3 to initialize registers with its value in the next run. |
| 841 | __ LoadP(r3, MemOperand(frame_pointer(), kStringStartMinusOne)); |
| 842 | |
| 843 | if (global_with_zero_length_check()) { |
| 844 | // Special case for zero-length matches. |
| 845 | // r25: capture start index |
| 846 | __ cmp(current_input_offset(), r25); |
| 847 | // Not a zero-length match, restart. |
| 848 | __ bne(&load_char_start_regexp); |
| 849 | // Offset from the end is zero if we already reached the end. |
| 850 | __ cmpi(current_input_offset(), Operand::Zero()); |
| 851 | __ beq(&exit_label_); |
| 852 | // Advance current position after a zero-length match. |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 853 | Label advance; |
| 854 | __ bind(&advance); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 855 | __ addi(current_input_offset(), current_input_offset(), |
| 856 | Operand((mode_ == UC16) ? 2 : 1)); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 857 | if (global_unicode()) CheckNotInSurrogatePair(0, &advance); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 858 | } |
| 859 | |
| 860 | __ b(&load_char_start_regexp); |
| 861 | } else { |
| 862 | __ li(r3, Operand(SUCCESS)); |
| 863 | } |
| 864 | } |
| 865 | |
| 866 | // Exit and return r3 |
| 867 | __ bind(&exit_label_); |
| 868 | if (global()) { |
| 869 | __ LoadP(r3, MemOperand(frame_pointer(), kSuccessfulCaptures)); |
| 870 | } |
| 871 | |
| 872 | __ bind(&return_r3); |
| 873 | // Skip sp past regexp registers and local variables.. |
| 874 | __ mr(sp, frame_pointer()); |
| 875 | // Restore registers r25..r31 and return (restoring lr to pc). |
| 876 | __ MultiPop(registers_to_retain); |
| 877 | __ pop(r0); |
| 878 | __ mtlr(r0); |
| 879 | __ blr(); |
| 880 | |
| 881 | // Backtrack code (branch target for conditional backtracks). |
| 882 | if (backtrack_label_.is_linked()) { |
| 883 | __ bind(&backtrack_label_); |
| 884 | Backtrack(); |
| 885 | } |
| 886 | |
| 887 | Label exit_with_exception; |
| 888 | |
| 889 | // Preempt-code |
| 890 | if (check_preempt_label_.is_linked()) { |
| 891 | SafeCallTarget(&check_preempt_label_); |
| 892 | |
| 893 | CallCheckStackGuardState(r3); |
| 894 | __ cmpi(r3, Operand::Zero()); |
| 895 | // If returning non-zero, we should end execution with the given |
| 896 | // result as return value. |
| 897 | __ bne(&return_r3); |
| 898 | |
| 899 | // String might have moved: Reload end of string from frame. |
| 900 | __ LoadP(end_of_input_address(), MemOperand(frame_pointer(), kInputEnd)); |
| 901 | SafeReturn(); |
| 902 | } |
| 903 | |
| 904 | // Backtrack stack overflow code. |
| 905 | if (stack_overflow_label_.is_linked()) { |
| 906 | SafeCallTarget(&stack_overflow_label_); |
| 907 | // Reached if the backtrack-stack limit has been hit. |
| 908 | Label grow_failed; |
| 909 | |
| 910 | // Call GrowStack(backtrack_stackpointer(), &stack_base) |
| 911 | static const int num_arguments = 3; |
| 912 | __ PrepareCallCFunction(num_arguments, r3); |
| 913 | __ mr(r3, backtrack_stackpointer()); |
| 914 | __ addi(r4, frame_pointer(), Operand(kStackHighEnd)); |
| 915 | __ mov(r5, Operand(ExternalReference::isolate_address(isolate()))); |
| 916 | ExternalReference grow_stack = |
| 917 | ExternalReference::re_grow_stack(isolate()); |
| 918 | __ CallCFunction(grow_stack, num_arguments); |
| 919 | // If return NULL, we have failed to grow the stack, and |
| 920 | // must exit with a stack-overflow exception. |
| 921 | __ cmpi(r3, Operand::Zero()); |
| 922 | __ beq(&exit_with_exception); |
| 923 | // Otherwise use return value as new stack pointer. |
| 924 | __ mr(backtrack_stackpointer(), r3); |
| 925 | // Restore saved registers and continue. |
| 926 | SafeReturn(); |
| 927 | } |
| 928 | |
| 929 | if (exit_with_exception.is_linked()) { |
| 930 | // If any of the code above needed to exit with an exception. |
| 931 | __ bind(&exit_with_exception); |
| 932 | // Exit with Result EXCEPTION(-1) to signal thrown exception. |
| 933 | __ li(r3, Operand(EXCEPTION)); |
| 934 | __ b(&return_r3); |
| 935 | } |
| 936 | } |
| 937 | |
| 938 | CodeDesc code_desc; |
| 939 | masm_->GetCode(&code_desc); |
| 940 | Handle<Code> code = isolate()->factory()->NewCode( |
| 941 | code_desc, Code::ComputeFlags(Code::REGEXP), masm_->CodeObject()); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 942 | PROFILE(masm_->isolate(), |
| 943 | RegExpCodeCreateEvent(AbstractCode::cast(*code), *source)); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 944 | return Handle<HeapObject>::cast(code); |
| 945 | } |
| 946 | |
| 947 | |
| 948 | void RegExpMacroAssemblerPPC::GoTo(Label* to) { BranchOrBacktrack(al, to); } |
| 949 | |
| 950 | |
| 951 | void RegExpMacroAssemblerPPC::IfRegisterGE(int reg, int comparand, |
| 952 | Label* if_ge) { |
| 953 | __ LoadP(r3, register_location(reg), r0); |
| 954 | __ Cmpi(r3, Operand(comparand), r0); |
| 955 | BranchOrBacktrack(ge, if_ge); |
| 956 | } |
| 957 | |
| 958 | |
| 959 | void RegExpMacroAssemblerPPC::IfRegisterLT(int reg, int comparand, |
| 960 | Label* if_lt) { |
| 961 | __ LoadP(r3, register_location(reg), r0); |
| 962 | __ Cmpi(r3, Operand(comparand), r0); |
| 963 | BranchOrBacktrack(lt, if_lt); |
| 964 | } |
| 965 | |
| 966 | |
| 967 | void RegExpMacroAssemblerPPC::IfRegisterEqPos(int reg, Label* if_eq) { |
| 968 | __ LoadP(r3, register_location(reg), r0); |
| 969 | __ cmp(r3, current_input_offset()); |
| 970 | BranchOrBacktrack(eq, if_eq); |
| 971 | } |
| 972 | |
| 973 | |
| 974 | RegExpMacroAssembler::IrregexpImplementation |
| 975 | RegExpMacroAssemblerPPC::Implementation() { |
| 976 | return kPPCImplementation; |
| 977 | } |
| 978 | |
| 979 | |
| 980 | void RegExpMacroAssemblerPPC::LoadCurrentCharacter(int cp_offset, |
| 981 | Label* on_end_of_input, |
| 982 | bool check_bounds, |
| 983 | int characters) { |
| 984 | DCHECK(cp_offset < (1 << 30)); // Be sane! (And ensure negation works) |
| 985 | if (check_bounds) { |
| 986 | if (cp_offset >= 0) { |
| 987 | CheckPosition(cp_offset + characters - 1, on_end_of_input); |
| 988 | } else { |
| 989 | CheckPosition(cp_offset, on_end_of_input); |
| 990 | } |
| 991 | } |
| 992 | LoadCurrentCharacterUnchecked(cp_offset, characters); |
| 993 | } |
| 994 | |
| 995 | |
| 996 | void RegExpMacroAssemblerPPC::PopCurrentPosition() { |
| 997 | Pop(current_input_offset()); |
| 998 | } |
| 999 | |
| 1000 | |
| 1001 | void RegExpMacroAssemblerPPC::PopRegister(int register_index) { |
| 1002 | Pop(r3); |
| 1003 | __ StoreP(r3, register_location(register_index), r0); |
| 1004 | } |
| 1005 | |
| 1006 | |
| 1007 | void RegExpMacroAssemblerPPC::PushBacktrack(Label* label) { |
| 1008 | __ mov_label_offset(r3, label); |
| 1009 | Push(r3); |
| 1010 | CheckStackLimit(); |
| 1011 | } |
| 1012 | |
| 1013 | |
| 1014 | void RegExpMacroAssemblerPPC::PushCurrentPosition() { |
| 1015 | Push(current_input_offset()); |
| 1016 | } |
| 1017 | |
| 1018 | |
| 1019 | void RegExpMacroAssemblerPPC::PushRegister(int register_index, |
| 1020 | StackCheckFlag check_stack_limit) { |
| 1021 | __ LoadP(r3, register_location(register_index), r0); |
| 1022 | Push(r3); |
| 1023 | if (check_stack_limit) CheckStackLimit(); |
| 1024 | } |
| 1025 | |
| 1026 | |
| 1027 | void RegExpMacroAssemblerPPC::ReadCurrentPositionFromRegister(int reg) { |
| 1028 | __ LoadP(current_input_offset(), register_location(reg), r0); |
| 1029 | } |
| 1030 | |
| 1031 | |
| 1032 | void RegExpMacroAssemblerPPC::ReadStackPointerFromRegister(int reg) { |
| 1033 | __ LoadP(backtrack_stackpointer(), register_location(reg), r0); |
| 1034 | __ LoadP(r3, MemOperand(frame_pointer(), kStackHighEnd)); |
| 1035 | __ add(backtrack_stackpointer(), backtrack_stackpointer(), r3); |
| 1036 | } |
| 1037 | |
| 1038 | |
| 1039 | void RegExpMacroAssemblerPPC::SetCurrentPositionFromEnd(int by) { |
| 1040 | Label after_position; |
| 1041 | __ Cmpi(current_input_offset(), Operand(-by * char_size()), r0); |
| 1042 | __ bge(&after_position); |
| 1043 | __ mov(current_input_offset(), Operand(-by * char_size())); |
| 1044 | // On RegExp code entry (where this operation is used), the character before |
| 1045 | // the current position is expected to be already loaded. |
| 1046 | // We have advanced the position, so it's safe to read backwards. |
| 1047 | LoadCurrentCharacterUnchecked(-1, 1); |
| 1048 | __ bind(&after_position); |
| 1049 | } |
| 1050 | |
| 1051 | |
| 1052 | void RegExpMacroAssemblerPPC::SetRegister(int register_index, int to) { |
| 1053 | DCHECK(register_index >= num_saved_registers_); // Reserved for positions! |
| 1054 | __ mov(r3, Operand(to)); |
| 1055 | __ StoreP(r3, register_location(register_index), r0); |
| 1056 | } |
| 1057 | |
| 1058 | |
| 1059 | bool RegExpMacroAssemblerPPC::Succeed() { |
| 1060 | __ b(&success_label_); |
| 1061 | return global(); |
| 1062 | } |
| 1063 | |
| 1064 | |
| 1065 | void RegExpMacroAssemblerPPC::WriteCurrentPositionToRegister(int reg, |
| 1066 | int cp_offset) { |
| 1067 | if (cp_offset == 0) { |
| 1068 | __ StoreP(current_input_offset(), register_location(reg), r0); |
| 1069 | } else { |
| 1070 | __ mov(r0, Operand(cp_offset * char_size())); |
| 1071 | __ add(r3, current_input_offset(), r0); |
| 1072 | __ StoreP(r3, register_location(reg), r0); |
| 1073 | } |
| 1074 | } |
| 1075 | |
| 1076 | |
| 1077 | void RegExpMacroAssemblerPPC::ClearRegisters(int reg_from, int reg_to) { |
| 1078 | DCHECK(reg_from <= reg_to); |
| 1079 | __ LoadP(r3, MemOperand(frame_pointer(), kStringStartMinusOne)); |
| 1080 | for (int reg = reg_from; reg <= reg_to; reg++) { |
| 1081 | __ StoreP(r3, register_location(reg), r0); |
| 1082 | } |
| 1083 | } |
| 1084 | |
| 1085 | |
| 1086 | void RegExpMacroAssemblerPPC::WriteStackPointerToRegister(int reg) { |
| 1087 | __ LoadP(r4, MemOperand(frame_pointer(), kStackHighEnd)); |
| 1088 | __ sub(r3, backtrack_stackpointer(), r4); |
| 1089 | __ StoreP(r3, register_location(reg), r0); |
| 1090 | } |
| 1091 | |
| 1092 | |
| 1093 | // Private methods: |
| 1094 | |
| 1095 | void RegExpMacroAssemblerPPC::CallCheckStackGuardState(Register scratch) { |
| 1096 | int frame_alignment = masm_->ActivationFrameAlignment(); |
| 1097 | int stack_space = kNumRequiredStackFrameSlots; |
| 1098 | int stack_passed_arguments = 1; // space for return address pointer |
| 1099 | |
| 1100 | // The following stack manipulation logic is similar to |
| 1101 | // PrepareCallCFunction. However, we need an extra slot on the |
| 1102 | // stack to house the return address parameter. |
| 1103 | if (frame_alignment > kPointerSize) { |
| 1104 | // Make stack end at alignment and make room for stack arguments |
| 1105 | // -- preserving original value of sp. |
| 1106 | __ mr(scratch, sp); |
| 1107 | __ addi(sp, sp, Operand(-(stack_passed_arguments + 1) * kPointerSize)); |
| 1108 | DCHECK(base::bits::IsPowerOfTwo32(frame_alignment)); |
| 1109 | __ ClearRightImm(sp, sp, Operand(WhichPowerOf2(frame_alignment))); |
| 1110 | __ StoreP(scratch, MemOperand(sp, stack_passed_arguments * kPointerSize)); |
| 1111 | } else { |
| 1112 | // Make room for stack arguments |
| 1113 | stack_space += stack_passed_arguments; |
| 1114 | } |
| 1115 | |
| 1116 | // Allocate frame with required slots to make ABI work. |
| 1117 | __ li(r0, Operand::Zero()); |
| 1118 | __ StorePU(r0, MemOperand(sp, -stack_space * kPointerSize)); |
| 1119 | |
| 1120 | // RegExp code frame pointer. |
| 1121 | __ mr(r5, frame_pointer()); |
| 1122 | // Code* of self. |
| 1123 | __ mov(r4, Operand(masm_->CodeObject())); |
| 1124 | // r3 will point to the return address, placed by DirectCEntry. |
| 1125 | __ addi(r3, sp, Operand(kStackFrameExtraParamSlot * kPointerSize)); |
| 1126 | |
| 1127 | ExternalReference stack_guard_check = |
| 1128 | ExternalReference::re_check_stack_guard_state(isolate()); |
| 1129 | __ mov(ip, Operand(stack_guard_check)); |
| 1130 | DirectCEntryStub stub(isolate()); |
| 1131 | stub.GenerateCall(masm_, ip); |
| 1132 | |
| 1133 | // Restore the stack pointer |
| 1134 | stack_space = kNumRequiredStackFrameSlots + stack_passed_arguments; |
| 1135 | if (frame_alignment > kPointerSize) { |
| 1136 | __ LoadP(sp, MemOperand(sp, stack_space * kPointerSize)); |
| 1137 | } else { |
| 1138 | __ addi(sp, sp, Operand(stack_space * kPointerSize)); |
| 1139 | } |
| 1140 | |
| 1141 | __ mov(code_pointer(), Operand(masm_->CodeObject())); |
| 1142 | } |
| 1143 | |
| 1144 | |
| 1145 | // Helper function for reading a value out of a stack frame. |
| 1146 | template <typename T> |
| 1147 | static T& frame_entry(Address re_frame, int frame_offset) { |
| 1148 | return reinterpret_cast<T&>(Memory::int32_at(re_frame + frame_offset)); |
| 1149 | } |
| 1150 | |
| 1151 | |
| 1152 | template <typename T> |
| 1153 | static T* frame_entry_address(Address re_frame, int frame_offset) { |
| 1154 | return reinterpret_cast<T*>(re_frame + frame_offset); |
| 1155 | } |
| 1156 | |
| 1157 | |
| 1158 | int RegExpMacroAssemblerPPC::CheckStackGuardState(Address* return_address, |
| 1159 | Code* re_code, |
| 1160 | Address re_frame) { |
| 1161 | return NativeRegExpMacroAssembler::CheckStackGuardState( |
| 1162 | frame_entry<Isolate*>(re_frame, kIsolate), |
| 1163 | frame_entry<intptr_t>(re_frame, kStartIndex), |
| 1164 | frame_entry<intptr_t>(re_frame, kDirectCall) == 1, return_address, |
| 1165 | re_code, frame_entry_address<String*>(re_frame, kInputString), |
| 1166 | frame_entry_address<const byte*>(re_frame, kInputStart), |
| 1167 | frame_entry_address<const byte*>(re_frame, kInputEnd)); |
| 1168 | } |
| 1169 | |
| 1170 | |
| 1171 | MemOperand RegExpMacroAssemblerPPC::register_location(int register_index) { |
| 1172 | DCHECK(register_index < (1 << 30)); |
| 1173 | if (num_registers_ <= register_index) { |
| 1174 | num_registers_ = register_index + 1; |
| 1175 | } |
| 1176 | return MemOperand(frame_pointer(), |
| 1177 | kRegisterZero - register_index * kPointerSize); |
| 1178 | } |
| 1179 | |
| 1180 | |
| 1181 | void RegExpMacroAssemblerPPC::CheckPosition(int cp_offset, |
| 1182 | Label* on_outside_input) { |
| 1183 | if (cp_offset >= 0) { |
| 1184 | __ Cmpi(current_input_offset(), Operand(-cp_offset * char_size()), r0); |
| 1185 | BranchOrBacktrack(ge, on_outside_input); |
| 1186 | } else { |
| 1187 | __ LoadP(r4, MemOperand(frame_pointer(), kStringStartMinusOne)); |
| 1188 | __ addi(r3, current_input_offset(), Operand(cp_offset * char_size())); |
| 1189 | __ cmp(r3, r4); |
| 1190 | BranchOrBacktrack(le, on_outside_input); |
| 1191 | } |
| 1192 | } |
| 1193 | |
| 1194 | |
| 1195 | void RegExpMacroAssemblerPPC::BranchOrBacktrack(Condition condition, Label* to, |
| 1196 | CRegister cr) { |
| 1197 | if (condition == al) { // Unconditional. |
| 1198 | if (to == NULL) { |
| 1199 | Backtrack(); |
| 1200 | return; |
| 1201 | } |
| 1202 | __ b(to); |
| 1203 | return; |
| 1204 | } |
| 1205 | if (to == NULL) { |
| 1206 | __ b(condition, &backtrack_label_, cr); |
| 1207 | return; |
| 1208 | } |
| 1209 | __ b(condition, to, cr); |
| 1210 | } |
| 1211 | |
| 1212 | |
| 1213 | void RegExpMacroAssemblerPPC::SafeCall(Label* to, Condition cond, |
| 1214 | CRegister cr) { |
| 1215 | __ b(cond, to, cr, SetLK); |
| 1216 | } |
| 1217 | |
| 1218 | |
| 1219 | void RegExpMacroAssemblerPPC::SafeReturn() { |
| 1220 | __ pop(r0); |
| 1221 | __ mov(ip, Operand(masm_->CodeObject())); |
| 1222 | __ add(r0, r0, ip); |
| 1223 | __ mtlr(r0); |
| 1224 | __ blr(); |
| 1225 | } |
| 1226 | |
| 1227 | |
| 1228 | void RegExpMacroAssemblerPPC::SafeCallTarget(Label* name) { |
| 1229 | __ bind(name); |
| 1230 | __ mflr(r0); |
| 1231 | __ mov(ip, Operand(masm_->CodeObject())); |
| 1232 | __ sub(r0, r0, ip); |
| 1233 | __ push(r0); |
| 1234 | } |
| 1235 | |
| 1236 | |
| 1237 | void RegExpMacroAssemblerPPC::Push(Register source) { |
| 1238 | DCHECK(!source.is(backtrack_stackpointer())); |
| 1239 | __ StorePU(source, MemOperand(backtrack_stackpointer(), -kPointerSize)); |
| 1240 | } |
| 1241 | |
| 1242 | |
| 1243 | void RegExpMacroAssemblerPPC::Pop(Register target) { |
| 1244 | DCHECK(!target.is(backtrack_stackpointer())); |
| 1245 | __ LoadP(target, MemOperand(backtrack_stackpointer())); |
| 1246 | __ addi(backtrack_stackpointer(), backtrack_stackpointer(), |
| 1247 | Operand(kPointerSize)); |
| 1248 | } |
| 1249 | |
| 1250 | |
| 1251 | void RegExpMacroAssemblerPPC::CheckPreemption() { |
| 1252 | // Check for preemption. |
| 1253 | ExternalReference stack_limit = |
| 1254 | ExternalReference::address_of_stack_limit(isolate()); |
| 1255 | __ mov(r3, Operand(stack_limit)); |
| 1256 | __ LoadP(r3, MemOperand(r3)); |
| 1257 | __ cmpl(sp, r3); |
| 1258 | SafeCall(&check_preempt_label_, le); |
| 1259 | } |
| 1260 | |
| 1261 | |
| 1262 | void RegExpMacroAssemblerPPC::CheckStackLimit() { |
| 1263 | ExternalReference stack_limit = |
| 1264 | ExternalReference::address_of_regexp_stack_limit(isolate()); |
| 1265 | __ mov(r3, Operand(stack_limit)); |
| 1266 | __ LoadP(r3, MemOperand(r3)); |
| 1267 | __ cmpl(backtrack_stackpointer(), r3); |
| 1268 | SafeCall(&stack_overflow_label_, le); |
| 1269 | } |
| 1270 | |
| 1271 | |
| 1272 | bool RegExpMacroAssemblerPPC::CanReadUnaligned() { |
| 1273 | return CpuFeatures::IsSupported(UNALIGNED_ACCESSES) && !slow_safe(); |
| 1274 | } |
| 1275 | |
| 1276 | |
| 1277 | void RegExpMacroAssemblerPPC::LoadCurrentCharacterUnchecked(int cp_offset, |
| 1278 | int characters) { |
| 1279 | Register offset = current_input_offset(); |
| 1280 | if (cp_offset != 0) { |
| 1281 | // r25 is not being used to store the capture start index at this point. |
| 1282 | __ addi(r25, current_input_offset(), Operand(cp_offset * char_size())); |
| 1283 | offset = r25; |
| 1284 | } |
| 1285 | // The lwz, stw, lhz, sth instructions can do unaligned accesses, if the CPU |
| 1286 | // and the operating system running on the target allow it. |
| 1287 | // We assume we don't want to do unaligned loads on PPC, so this function |
| 1288 | // must only be used to load a single character at a time. |
| 1289 | |
| 1290 | DCHECK(characters == 1); |
| 1291 | __ add(current_character(), end_of_input_address(), offset); |
| 1292 | if (mode_ == LATIN1) { |
| 1293 | __ lbz(current_character(), MemOperand(current_character())); |
| 1294 | } else { |
| 1295 | DCHECK(mode_ == UC16); |
| 1296 | __ lhz(current_character(), MemOperand(current_character())); |
| 1297 | } |
| 1298 | } |
| 1299 | |
| 1300 | |
| 1301 | #undef __ |
| 1302 | |
| 1303 | #endif // V8_INTERPRETED_REGEXP |
| 1304 | } // namespace internal |
| 1305 | } // namespace v8 |
| 1306 | |
| 1307 | #endif // V8_TARGET_ARCH_PPC |