ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 1 | // Copyright 2009 the V8 project authors. All rights reserved. |
mads.s.ager@gmail.com | 9a4089a | 2008-09-01 08:55:01 +0000 | [diff] [blame] | 2 | // Redistribution and use in source and binary forms, with or without |
| 3 | // modification, are permitted provided that the following conditions are |
| 4 | // met: |
| 5 | // |
| 6 | // * Redistributions of source code must retain the above copyright |
| 7 | // notice, this list of conditions and the following disclaimer. |
| 8 | // * Redistributions in binary form must reproduce the above |
| 9 | // copyright notice, this list of conditions and the following |
| 10 | // disclaimer in the documentation and/or other materials provided |
| 11 | // with the distribution. |
| 12 | // * Neither the name of Google Inc. nor the names of its |
| 13 | // contributors may be used to endorse or promote products derived |
| 14 | // from this software without specific prior written permission. |
| 15 | // |
| 16 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 17 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 18 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 19 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 20 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 21 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 22 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 26 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 28 | #include "v8.h" |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 29 | |
| 30 | #if defined(V8_TARGET_ARCH_ARM) |
| 31 | |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 32 | #include "unicode.h" |
| 33 | #include "log.h" |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 34 | #include "code-stubs.h" |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 35 | #include "regexp-stack.h" |
| 36 | #include "macro-assembler.h" |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 37 | #include "regexp-macro-assembler.h" |
ager@chromium.org | 3a37e9b | 2009-04-27 09:26:21 +0000 | [diff] [blame] | 38 | #include "arm/regexp-macro-assembler-arm.h" |
mads.s.ager@gmail.com | 9a4089a | 2008-09-01 08:55:01 +0000 | [diff] [blame] | 39 | |
kasperl@chromium.org | 71affb5 | 2009-05-26 05:44:31 +0000 | [diff] [blame] | 40 | namespace v8 { |
| 41 | namespace internal { |
mads.s.ager@gmail.com | 9a4089a | 2008-09-01 08:55:01 +0000 | [diff] [blame] | 42 | |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 43 | #ifndef V8_INTERPRETED_REGEXP |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 44 | /* |
| 45 | * This assembler uses the following register assignment convention |
| 46 | * - r5 : Pointer to current code object (Code*) including heap object tag. |
| 47 | * - r6 : Current position in input, as negative offset from end of string. |
| 48 | * Please notice that this is the byte offset, not the character offset! |
| 49 | * - r7 : Currently loaded character. Must be loaded using |
| 50 | * LoadCurrentCharacter before using any of the dispatch methods. |
| 51 | * - r8 : points to tip of backtrack stack |
| 52 | * - r9 : Unused, might be used by C code and expected unchanged. |
| 53 | * - r10 : End of input (points to byte after last character in input). |
| 54 | * - r11 : Frame pointer. Used to access arguments, local variables and |
| 55 | * RegExp registers. |
| 56 | * - r12 : IP register, used by assembler. Very volatile. |
| 57 | * - r13/sp : points to tip of C stack. |
| 58 | * |
| 59 | * The remaining registers are free for computations. |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 60 | * Each call to a public method should retain this convention. |
kmillikin@chromium.org | 49edbdf | 2011-02-16 12:32:18 +0000 | [diff] [blame] | 61 | * |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 62 | * The stack will have the following structure: |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 63 | * - fp[52] Isolate* isolate (Address of the current isolate) |
kmillikin@chromium.org | 49edbdf | 2011-02-16 12:32:18 +0000 | [diff] [blame] | 64 | * - fp[48] direct_call (if 1, direct call from JavaScript code, |
| 65 | * if 0, call through the runtime system). |
| 66 | * - fp[44] stack_area_base (High end of the memory area to use as |
| 67 | * backtracking stack). |
| 68 | * - fp[40] int* capture_array (int[num_saved_registers_], for output). |
| 69 | * - fp[36] secondary link/return address used by native call. |
| 70 | * --- sp when called --- |
| 71 | * - fp[32] return address (lr). |
| 72 | * - fp[28] old frame pointer (r11). |
| 73 | * - fp[0..24] backup of registers r4..r10. |
| 74 | * --- frame pointer ---- |
| 75 | * - fp[-4] end of input (Address of end of string). |
| 76 | * - fp[-8] start of input (Address of first character in string). |
| 77 | * - fp[-12] start index (character index of start). |
| 78 | * - fp[-16] void* input_string (location of a handle containing the string). |
| 79 | * - fp[-20] Offset of location before start of input (effectively character |
| 80 | * position -1). Used to initialize capture registers to a |
| 81 | * non-position. |
| 82 | * - fp[-24] At start (if 1, we are starting at the start of the |
| 83 | * string, otherwise 0) |
| 84 | * - fp[-28] register 0 (Only positions must be stored in the first |
| 85 | * - register 1 num_saved_registers_ registers) |
| 86 | * - ... |
| 87 | * - register num_registers-1 |
| 88 | * --- sp --- |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 89 | * |
| 90 | * The first num_saved_registers_ registers are initialized to point to |
| 91 | * "character -1" in the string (i.e., char_size() bytes before the first |
| 92 | * character of the string). The remaining registers start out as garbage. |
| 93 | * |
| 94 | * The data up to the return address must be placed there by the calling |
kmillikin@chromium.org | 49edbdf | 2011-02-16 12:32:18 +0000 | [diff] [blame] | 95 | * code and the remaining arguments are passed in registers, e.g. by calling the |
| 96 | * code entry as cast to a function with the signature: |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 97 | * int (*match)(String* input_string, |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 98 | * int start_index, |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 99 | * Address start, |
| 100 | * Address end, |
kmillikin@chromium.org | 49edbdf | 2011-02-16 12:32:18 +0000 | [diff] [blame] | 101 | * Address secondary_return_address, // Only used by native call. |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 102 | * int* capture_output_array, |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 103 | * byte* stack_area_base, |
kmillikin@chromium.org | 49edbdf | 2011-02-16 12:32:18 +0000 | [diff] [blame] | 104 | * bool direct_call = false) |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 105 | * The call is performed by NativeRegExpMacroAssembler::Execute() |
kmillikin@chromium.org | 49edbdf | 2011-02-16 12:32:18 +0000 | [diff] [blame] | 106 | * (in regexp-macro-assembler.cc) via the CALL_GENERATED_REGEXP_CODE macro |
| 107 | * in arm/simulator-arm.h. |
| 108 | * When calling as a non-direct call (i.e., from C++ code), the return address |
| 109 | * area is overwritten with the LR register by the RegExp code. When doing a |
| 110 | * direct call from generated code, the return address is placed there by |
| 111 | * the calling code, as in a normal exit frame. |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 112 | */ |
| 113 | |
| 114 | #define __ ACCESS_MASM(masm_) |
| 115 | |
| 116 | RegExpMacroAssemblerARM::RegExpMacroAssemblerARM( |
| 117 | Mode mode, |
| 118 | int registers_to_save) |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 119 | : masm_(new MacroAssembler(Isolate::Current(), NULL, kRegExpCodeSize)), |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 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 | ASSERT_EQ(0, registers_to_save % 2); |
| 129 | __ jmp(&entry_label_); // We'll write the entry code later. |
| 130 | EmitBacktrackConstantPool(); |
| 131 | __ bind(&start_label_); // And then continue from here. |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 132 | } |
| 133 | |
| 134 | |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 135 | RegExpMacroAssemblerARM::~RegExpMacroAssemblerARM() { |
| 136 | delete masm_; |
| 137 | // Unuse labels in case we throw away the assembler without calling GetCode. |
| 138 | entry_label_.Unuse(); |
| 139 | start_label_.Unuse(); |
| 140 | success_label_.Unuse(); |
| 141 | backtrack_label_.Unuse(); |
| 142 | exit_label_.Unuse(); |
| 143 | check_preempt_label_.Unuse(); |
| 144 | stack_overflow_label_.Unuse(); |
| 145 | } |
| 146 | |
| 147 | |
| 148 | int RegExpMacroAssemblerARM::stack_limit_slack() { |
| 149 | return RegExpStack::kStackLimitSlack; |
| 150 | } |
| 151 | |
| 152 | |
| 153 | void RegExpMacroAssemblerARM::AdvanceCurrentPosition(int by) { |
| 154 | if (by != 0) { |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 155 | __ add(current_input_offset(), |
| 156 | current_input_offset(), Operand(by * char_size())); |
| 157 | } |
| 158 | } |
| 159 | |
| 160 | |
| 161 | void RegExpMacroAssemblerARM::AdvanceRegister(int reg, int by) { |
| 162 | ASSERT(reg >= 0); |
| 163 | ASSERT(reg < num_registers_); |
| 164 | if (by != 0) { |
| 165 | __ ldr(r0, register_location(reg)); |
| 166 | __ add(r0, r0, Operand(by)); |
| 167 | __ str(r0, register_location(reg)); |
| 168 | } |
| 169 | } |
| 170 | |
| 171 | |
| 172 | void RegExpMacroAssemblerARM::Backtrack() { |
| 173 | CheckPreemption(); |
| 174 | // Pop Code* offset from backtrack stack, add Code* and jump to location. |
| 175 | Pop(r0); |
ager@chromium.org | 357bf65 | 2010-04-12 11:30:10 +0000 | [diff] [blame] | 176 | __ add(pc, r0, Operand(code_pointer())); |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 177 | } |
| 178 | |
| 179 | |
| 180 | void RegExpMacroAssemblerARM::Bind(Label* label) { |
| 181 | __ bind(label); |
| 182 | } |
| 183 | |
| 184 | |
| 185 | void RegExpMacroAssemblerARM::CheckCharacter(uint32_t c, Label* on_equal) { |
| 186 | __ cmp(current_character(), Operand(c)); |
| 187 | BranchOrBacktrack(eq, on_equal); |
| 188 | } |
| 189 | |
| 190 | |
| 191 | void RegExpMacroAssemblerARM::CheckCharacterGT(uc16 limit, Label* on_greater) { |
| 192 | __ cmp(current_character(), Operand(limit)); |
| 193 | BranchOrBacktrack(gt, on_greater); |
| 194 | } |
| 195 | |
| 196 | |
| 197 | void RegExpMacroAssemblerARM::CheckAtStart(Label* on_at_start) { |
| 198 | Label not_at_start; |
| 199 | // Did we start the match at the start of the string at all? |
| 200 | __ ldr(r0, MemOperand(frame_pointer(), kAtStart)); |
ager@chromium.org | 5b2fbee | 2010-09-08 06:38:15 +0000 | [diff] [blame] | 201 | __ cmp(r0, Operand(0, RelocInfo::NONE)); |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 202 | BranchOrBacktrack(eq, ¬_at_start); |
| 203 | |
| 204 | // If we did, are we still at the start of the input? |
| 205 | __ ldr(r1, MemOperand(frame_pointer(), kInputStart)); |
| 206 | __ add(r0, end_of_input_address(), Operand(current_input_offset())); |
| 207 | __ cmp(r0, r1); |
| 208 | BranchOrBacktrack(eq, on_at_start); |
| 209 | __ bind(¬_at_start); |
| 210 | } |
| 211 | |
| 212 | |
| 213 | void RegExpMacroAssemblerARM::CheckNotAtStart(Label* on_not_at_start) { |
| 214 | // Did we start the match at the start of the string at all? |
| 215 | __ ldr(r0, MemOperand(frame_pointer(), kAtStart)); |
ager@chromium.org | 5b2fbee | 2010-09-08 06:38:15 +0000 | [diff] [blame] | 216 | __ cmp(r0, Operand(0, RelocInfo::NONE)); |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 217 | BranchOrBacktrack(eq, on_not_at_start); |
| 218 | // If we did, are we still at the start of the input? |
| 219 | __ ldr(r1, MemOperand(frame_pointer(), kInputStart)); |
| 220 | __ add(r0, end_of_input_address(), Operand(current_input_offset())); |
| 221 | __ cmp(r0, r1); |
| 222 | BranchOrBacktrack(ne, on_not_at_start); |
| 223 | } |
| 224 | |
| 225 | |
| 226 | void RegExpMacroAssemblerARM::CheckCharacterLT(uc16 limit, Label* on_less) { |
| 227 | __ cmp(current_character(), Operand(limit)); |
| 228 | BranchOrBacktrack(lt, on_less); |
| 229 | } |
| 230 | |
| 231 | |
| 232 | void RegExpMacroAssemblerARM::CheckCharacters(Vector<const uc16> str, |
| 233 | int cp_offset, |
| 234 | Label* on_failure, |
| 235 | bool check_end_of_string) { |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 236 | if (on_failure == NULL) { |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 237 | // Instead of inlining a backtrack for each test, (re)use the global |
| 238 | // backtrack target. |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 239 | on_failure = &backtrack_label_; |
| 240 | } |
| 241 | |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 242 | if (check_end_of_string) { |
| 243 | // Is last character of required match inside string. |
| 244 | CheckPosition(cp_offset + str.length() - 1, on_failure); |
| 245 | } |
| 246 | |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 247 | __ add(r0, end_of_input_address(), Operand(current_input_offset())); |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 248 | if (cp_offset != 0) { |
| 249 | int byte_offset = cp_offset * char_size(); |
| 250 | __ add(r0, r0, Operand(byte_offset)); |
| 251 | } |
| 252 | |
| 253 | // r0 : Address of characters to match against str. |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 254 | int stored_high_byte = 0; |
| 255 | for (int i = 0; i < str.length(); i++) { |
| 256 | if (mode_ == ASCII) { |
| 257 | __ ldrb(r1, MemOperand(r0, char_size(), PostIndex)); |
ager@chromium.org | a1645e2 | 2009-09-09 19:27:10 +0000 | [diff] [blame] | 258 | ASSERT(str[i] <= String::kMaxAsciiCharCode); |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 259 | __ cmp(r1, Operand(str[i])); |
| 260 | } else { |
| 261 | __ ldrh(r1, MemOperand(r0, char_size(), PostIndex)); |
| 262 | uc16 match_char = str[i]; |
| 263 | int match_high_byte = (match_char >> 8); |
| 264 | if (match_high_byte == 0) { |
| 265 | __ cmp(r1, Operand(str[i])); |
| 266 | } else { |
| 267 | if (match_high_byte != stored_high_byte) { |
| 268 | __ mov(r2, Operand(match_high_byte)); |
| 269 | stored_high_byte = match_high_byte; |
| 270 | } |
| 271 | __ add(r3, r2, Operand(match_char & 0xff)); |
| 272 | __ cmp(r1, r3); |
| 273 | } |
| 274 | } |
| 275 | BranchOrBacktrack(ne, on_failure); |
| 276 | } |
| 277 | } |
| 278 | |
| 279 | |
| 280 | void RegExpMacroAssemblerARM::CheckGreedyLoop(Label* on_equal) { |
| 281 | __ ldr(r0, MemOperand(backtrack_stackpointer(), 0)); |
| 282 | __ cmp(current_input_offset(), r0); |
| 283 | __ add(backtrack_stackpointer(), |
| 284 | backtrack_stackpointer(), Operand(kPointerSize), LeaveCC, eq); |
| 285 | BranchOrBacktrack(eq, on_equal); |
| 286 | } |
| 287 | |
| 288 | |
| 289 | void RegExpMacroAssemblerARM::CheckNotBackReferenceIgnoreCase( |
| 290 | int start_reg, |
| 291 | Label* on_no_match) { |
| 292 | Label fallthrough; |
| 293 | __ ldr(r0, register_location(start_reg)); // Index of start of capture |
| 294 | __ ldr(r1, register_location(start_reg + 1)); // Index of end of capture |
| 295 | __ sub(r1, r1, r0, SetCC); // Length of capture. |
| 296 | |
| 297 | // If length is zero, either the capture is empty or it is not participating. |
| 298 | // In either case succeed immediately. |
| 299 | __ b(eq, &fallthrough); |
| 300 | |
| 301 | // Check that there are enough characters left in the input. |
| 302 | __ cmn(r1, Operand(current_input_offset())); |
| 303 | BranchOrBacktrack(gt, on_no_match); |
| 304 | |
| 305 | if (mode_ == ASCII) { |
| 306 | Label success; |
| 307 | Label fail; |
| 308 | Label loop_check; |
| 309 | |
| 310 | // r0 - offset of start of capture |
| 311 | // r1 - length of capture |
| 312 | __ add(r0, r0, Operand(end_of_input_address())); |
| 313 | __ add(r2, end_of_input_address(), Operand(current_input_offset())); |
| 314 | __ add(r1, r0, Operand(r1)); |
| 315 | |
| 316 | // r0 - Address of start of capture. |
| 317 | // r1 - Address of end of capture |
| 318 | // r2 - Address of current input position. |
| 319 | |
| 320 | Label loop; |
| 321 | __ bind(&loop); |
| 322 | __ ldrb(r3, MemOperand(r0, char_size(), PostIndex)); |
| 323 | __ ldrb(r4, MemOperand(r2, char_size(), PostIndex)); |
| 324 | __ cmp(r4, r3); |
| 325 | __ b(eq, &loop_check); |
| 326 | |
| 327 | // Mismatch, try case-insensitive match (converting letters to lower-case). |
| 328 | __ orr(r3, r3, Operand(0x20)); // Convert capture character to lower-case. |
| 329 | __ orr(r4, r4, Operand(0x20)); // Also convert input character. |
| 330 | __ cmp(r4, r3); |
| 331 | __ b(ne, &fail); |
| 332 | __ sub(r3, r3, Operand('a')); |
| 333 | __ cmp(r3, Operand('z' - 'a')); // Is r3 a lowercase letter? |
| 334 | __ b(hi, &fail); |
| 335 | |
| 336 | |
| 337 | __ bind(&loop_check); |
| 338 | __ cmp(r0, r1); |
| 339 | __ b(lt, &loop); |
| 340 | __ jmp(&success); |
| 341 | |
| 342 | __ bind(&fail); |
| 343 | BranchOrBacktrack(al, on_no_match); |
| 344 | |
| 345 | __ bind(&success); |
| 346 | // Compute new value of character position after the matched part. |
| 347 | __ sub(current_input_offset(), r2, end_of_input_address()); |
| 348 | } else { |
| 349 | ASSERT(mode_ == UC16); |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 350 | int argument_count = 4; |
ager@chromium.org | 357bf65 | 2010-04-12 11:30:10 +0000 | [diff] [blame] | 351 | __ PrepareCallCFunction(argument_count, r2); |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 352 | |
| 353 | // r0 - offset of start of capture |
| 354 | // r1 - length of capture |
| 355 | |
| 356 | // Put arguments into arguments registers. |
| 357 | // Parameters are |
| 358 | // r0: Address byte_offset1 - Address captured substring's start. |
| 359 | // r1: Address byte_offset2 - Address of current character position. |
| 360 | // r2: size_t byte_length - length of capture in bytes(!) |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 361 | // r3: Isolate* isolate |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 362 | |
| 363 | // Address of start of capture. |
| 364 | __ add(r0, r0, Operand(end_of_input_address())); |
| 365 | // Length of capture. |
| 366 | __ mov(r2, Operand(r1)); |
| 367 | // Save length in callee-save register for use on return. |
| 368 | __ mov(r4, Operand(r1)); |
| 369 | // Address of current input position. |
| 370 | __ add(r1, current_input_offset(), Operand(end_of_input_address())); |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 371 | // Isolate. |
| 372 | __ mov(r3, Operand(ExternalReference::isolate_address())); |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 373 | |
| 374 | ExternalReference function = |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 375 | ExternalReference::re_case_insensitive_compare_uc16(masm_->isolate()); |
ager@chromium.org | 357bf65 | 2010-04-12 11:30:10 +0000 | [diff] [blame] | 376 | __ CallCFunction(function, argument_count); |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 377 | |
| 378 | // Check if function returned non-zero for success or zero for failure. |
ager@chromium.org | 5b2fbee | 2010-09-08 06:38:15 +0000 | [diff] [blame] | 379 | __ cmp(r0, Operand(0, RelocInfo::NONE)); |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 380 | BranchOrBacktrack(eq, on_no_match); |
| 381 | // On success, increment position by length of capture. |
| 382 | __ add(current_input_offset(), current_input_offset(), Operand(r4)); |
| 383 | } |
| 384 | |
| 385 | __ bind(&fallthrough); |
| 386 | } |
| 387 | |
| 388 | |
| 389 | void RegExpMacroAssemblerARM::CheckNotBackReference( |
| 390 | int start_reg, |
| 391 | Label* on_no_match) { |
| 392 | Label fallthrough; |
| 393 | Label success; |
| 394 | |
| 395 | // Find length of back-referenced capture. |
| 396 | __ ldr(r0, register_location(start_reg)); |
| 397 | __ ldr(r1, register_location(start_reg + 1)); |
| 398 | __ sub(r1, r1, r0, SetCC); // Length to check. |
| 399 | // Succeed on empty capture (including no capture). |
| 400 | __ b(eq, &fallthrough); |
| 401 | |
| 402 | // Check that there are enough characters left in the input. |
| 403 | __ cmn(r1, Operand(current_input_offset())); |
| 404 | BranchOrBacktrack(gt, on_no_match); |
| 405 | |
| 406 | // Compute pointers to match string and capture string |
| 407 | __ add(r0, r0, Operand(end_of_input_address())); |
| 408 | __ add(r2, end_of_input_address(), Operand(current_input_offset())); |
| 409 | __ add(r1, r1, Operand(r0)); |
| 410 | |
| 411 | Label loop; |
| 412 | __ bind(&loop); |
| 413 | if (mode_ == ASCII) { |
| 414 | __ ldrb(r3, MemOperand(r0, char_size(), PostIndex)); |
| 415 | __ ldrb(r4, MemOperand(r2, char_size(), PostIndex)); |
| 416 | } else { |
| 417 | ASSERT(mode_ == UC16); |
| 418 | __ ldrh(r3, MemOperand(r0, char_size(), PostIndex)); |
| 419 | __ ldrh(r4, MemOperand(r2, char_size(), PostIndex)); |
| 420 | } |
| 421 | __ cmp(r3, r4); |
| 422 | BranchOrBacktrack(ne, on_no_match); |
| 423 | __ cmp(r0, r1); |
| 424 | __ b(lt, &loop); |
| 425 | |
| 426 | // Move current character position to position after match. |
| 427 | __ sub(current_input_offset(), r2, end_of_input_address()); |
| 428 | __ bind(&fallthrough); |
| 429 | } |
| 430 | |
| 431 | |
| 432 | void RegExpMacroAssemblerARM::CheckNotRegistersEqual(int reg1, |
sgjesse@chromium.org | c6c5718 | 2011-01-17 12:24:25 +0000 | [diff] [blame] | 433 | int reg2, |
| 434 | Label* on_not_equal) { |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 435 | __ ldr(r0, register_location(reg1)); |
| 436 | __ ldr(r1, register_location(reg2)); |
| 437 | __ cmp(r0, r1); |
| 438 | BranchOrBacktrack(ne, on_not_equal); |
| 439 | } |
| 440 | |
| 441 | |
sgjesse@chromium.org | c6c5718 | 2011-01-17 12:24:25 +0000 | [diff] [blame] | 442 | void RegExpMacroAssemblerARM::CheckNotCharacter(unsigned c, |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 443 | Label* on_not_equal) { |
| 444 | __ cmp(current_character(), Operand(c)); |
| 445 | BranchOrBacktrack(ne, on_not_equal); |
| 446 | } |
| 447 | |
| 448 | |
| 449 | void RegExpMacroAssemblerARM::CheckCharacterAfterAnd(uint32_t c, |
| 450 | uint32_t mask, |
| 451 | Label* on_equal) { |
| 452 | __ and_(r0, current_character(), Operand(mask)); |
| 453 | __ cmp(r0, Operand(c)); |
| 454 | BranchOrBacktrack(eq, on_equal); |
| 455 | } |
| 456 | |
| 457 | |
sgjesse@chromium.org | c6c5718 | 2011-01-17 12:24:25 +0000 | [diff] [blame] | 458 | void RegExpMacroAssemblerARM::CheckNotCharacterAfterAnd(unsigned c, |
| 459 | unsigned mask, |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 460 | Label* on_not_equal) { |
| 461 | __ and_(r0, current_character(), Operand(mask)); |
| 462 | __ cmp(r0, Operand(c)); |
| 463 | BranchOrBacktrack(ne, on_not_equal); |
| 464 | } |
| 465 | |
| 466 | |
| 467 | void RegExpMacroAssemblerARM::CheckNotCharacterAfterMinusAnd( |
| 468 | uc16 c, |
| 469 | uc16 minus, |
| 470 | uc16 mask, |
| 471 | Label* on_not_equal) { |
| 472 | ASSERT(minus < String::kMaxUC16CharCode); |
| 473 | __ sub(r0, current_character(), Operand(minus)); |
| 474 | __ and_(r0, r0, Operand(mask)); |
| 475 | __ cmp(r0, Operand(c)); |
| 476 | BranchOrBacktrack(ne, on_not_equal); |
| 477 | } |
| 478 | |
| 479 | |
| 480 | bool RegExpMacroAssemblerARM::CheckSpecialCharacterClass(uc16 type, |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 481 | Label* on_no_match) { |
| 482 | // Range checks (c in min..max) are generally implemented by an unsigned |
| 483 | // (c - min) <= (max - min) check |
| 484 | switch (type) { |
| 485 | case 's': |
| 486 | // Match space-characters |
| 487 | if (mode_ == ASCII) { |
| 488 | // ASCII space characters are '\t'..'\r' and ' '. |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 489 | Label success; |
| 490 | __ cmp(current_character(), Operand(' ')); |
| 491 | __ b(eq, &success); |
| 492 | // Check range 0x09..0x0d |
| 493 | __ sub(r0, current_character(), Operand('\t')); |
| 494 | __ cmp(r0, Operand('\r' - '\t')); |
| 495 | BranchOrBacktrack(hi, on_no_match); |
| 496 | __ bind(&success); |
| 497 | return true; |
| 498 | } |
| 499 | return false; |
| 500 | case 'S': |
| 501 | // Match non-space characters. |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 502 | if (mode_ == ASCII) { |
| 503 | // ASCII space characters are '\t'..'\r' and ' '. |
| 504 | __ cmp(current_character(), Operand(' ')); |
| 505 | BranchOrBacktrack(eq, on_no_match); |
| 506 | __ sub(r0, current_character(), Operand('\t')); |
| 507 | __ cmp(r0, Operand('\r' - '\t')); |
| 508 | BranchOrBacktrack(ls, on_no_match); |
| 509 | return true; |
| 510 | } |
| 511 | return false; |
| 512 | case 'd': |
| 513 | // Match ASCII digits ('0'..'9') |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 514 | __ sub(r0, current_character(), Operand('0')); |
| 515 | __ cmp(current_character(), Operand('9' - '0')); |
| 516 | BranchOrBacktrack(hi, on_no_match); |
| 517 | return true; |
| 518 | case 'D': |
| 519 | // Match non ASCII-digits |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 520 | __ sub(r0, current_character(), Operand('0')); |
| 521 | __ cmp(r0, Operand('9' - '0')); |
| 522 | BranchOrBacktrack(ls, on_no_match); |
| 523 | return true; |
| 524 | case '.': { |
| 525 | // Match non-newlines (not 0x0a('\n'), 0x0d('\r'), 0x2028 and 0x2029) |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 526 | __ eor(r0, current_character(), Operand(0x01)); |
| 527 | // See if current character is '\n'^1 or '\r'^1, i.e., 0x0b or 0x0c |
| 528 | __ sub(r0, r0, Operand(0x0b)); |
| 529 | __ cmp(r0, Operand(0x0c - 0x0b)); |
| 530 | BranchOrBacktrack(ls, on_no_match); |
| 531 | if (mode_ == UC16) { |
| 532 | // Compare original value to 0x2028 and 0x2029, using the already |
| 533 | // computed (current_char ^ 0x01 - 0x0b). I.e., check for |
| 534 | // 0x201d (0x2028 - 0x0b) or 0x201e. |
| 535 | __ sub(r0, r0, Operand(0x2028 - 0x0b)); |
| 536 | __ cmp(r0, Operand(1)); |
| 537 | BranchOrBacktrack(ls, on_no_match); |
| 538 | } |
| 539 | return true; |
| 540 | } |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 541 | case 'n': { |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 542 | // Match newlines (0x0a('\n'), 0x0d('\r'), 0x2028 and 0x2029) |
| 543 | __ eor(r0, current_character(), Operand(0x01)); |
| 544 | // See if current character is '\n'^1 or '\r'^1, i.e., 0x0b or 0x0c |
| 545 | __ sub(r0, r0, Operand(0x0b)); |
| 546 | __ cmp(r0, Operand(0x0c - 0x0b)); |
| 547 | if (mode_ == ASCII) { |
| 548 | BranchOrBacktrack(hi, on_no_match); |
| 549 | } else { |
| 550 | Label done; |
| 551 | __ b(ls, &done); |
| 552 | // Compare original value to 0x2028 and 0x2029, using the already |
| 553 | // computed (current_char ^ 0x01 - 0x0b). I.e., check for |
| 554 | // 0x201d (0x2028 - 0x0b) or 0x201e. |
| 555 | __ sub(r0, r0, Operand(0x2028 - 0x0b)); |
| 556 | __ cmp(r0, Operand(1)); |
| 557 | BranchOrBacktrack(hi, on_no_match); |
| 558 | __ bind(&done); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 559 | } |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 560 | return true; |
| 561 | } |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 562 | case 'w': { |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 563 | if (mode_ != ASCII) { |
| 564 | // Table is 128 entries, so all ASCII characters can be tested. |
| 565 | __ cmp(current_character(), Operand('z')); |
| 566 | BranchOrBacktrack(hi, on_no_match); |
| 567 | } |
| 568 | ExternalReference map = ExternalReference::re_word_character_map(); |
| 569 | __ mov(r0, Operand(map)); |
| 570 | __ ldrb(r0, MemOperand(r0, current_character())); |
| 571 | __ tst(r0, Operand(r0)); |
| 572 | BranchOrBacktrack(eq, on_no_match); |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 573 | return true; |
| 574 | } |
| 575 | case 'W': { |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 576 | Label done; |
| 577 | if (mode_ != ASCII) { |
| 578 | // Table is 128 entries, so all ASCII characters can be tested. |
| 579 | __ cmp(current_character(), Operand('z')); |
| 580 | __ b(hi, &done); |
| 581 | } |
| 582 | ExternalReference map = ExternalReference::re_word_character_map(); |
| 583 | __ mov(r0, Operand(map)); |
| 584 | __ ldrb(r0, MemOperand(r0, current_character())); |
| 585 | __ tst(r0, Operand(r0)); |
| 586 | BranchOrBacktrack(ne, on_no_match); |
| 587 | if (mode_ != ASCII) { |
| 588 | __ bind(&done); |
| 589 | } |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 590 | return true; |
| 591 | } |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 592 | case '*': |
| 593 | // Match any character. |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 594 | return true; |
fschneider@chromium.org | 0c20e67 | 2010-01-14 15:28:53 +0000 | [diff] [blame] | 595 | // No custom implementation (yet): s(UC16), S(UC16). |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 596 | default: |
| 597 | return false; |
| 598 | } |
| 599 | } |
| 600 | |
| 601 | |
| 602 | void RegExpMacroAssemblerARM::Fail() { |
| 603 | __ mov(r0, Operand(FAILURE)); |
| 604 | __ jmp(&exit_label_); |
| 605 | } |
| 606 | |
| 607 | |
karlklose@chromium.org | 83a4728 | 2011-05-11 11:54:09 +0000 | [diff] [blame] | 608 | Handle<HeapObject> RegExpMacroAssemblerARM::GetCode(Handle<String> source) { |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 609 | // Finalize code - write the entry point code now we know how many |
| 610 | // registers we need. |
| 611 | |
| 612 | // Entry code: |
| 613 | __ bind(&entry_label_); |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 614 | // Push arguments |
| 615 | // Save callee-save registers. |
| 616 | // Start new stack frame. |
kmillikin@chromium.org | 49edbdf | 2011-02-16 12:32:18 +0000 | [diff] [blame] | 617 | // Store link register in existing stack-cell. |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 618 | // Order here should correspond to order of offset constants in header file. |
| 619 | RegList registers_to_retain = r4.bit() | r5.bit() | r6.bit() | |
| 620 | r7.bit() | r8.bit() | r9.bit() | r10.bit() | fp.bit(); |
| 621 | RegList argument_registers = r0.bit() | r1.bit() | r2.bit() | r3.bit(); |
| 622 | __ stm(db_w, sp, argument_registers | registers_to_retain | lr.bit()); |
kmillikin@chromium.org | 49edbdf | 2011-02-16 12:32:18 +0000 | [diff] [blame] | 623 | // Set frame pointer in space for it if this is not a direct call |
| 624 | // from generated code. |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 625 | __ add(frame_pointer(), sp, Operand(4 * kPointerSize)); |
| 626 | __ push(r0); // Make room for "position - 1" constant (value is irrelevant). |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 627 | __ push(r0); // Make room for "at start" constant (value is irrelevant). |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 628 | // Check if we have space on the stack for registers. |
| 629 | Label stack_limit_hit; |
| 630 | Label stack_ok; |
| 631 | |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 632 | ExternalReference stack_limit = |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 633 | ExternalReference::address_of_stack_limit(masm_->isolate()); |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 634 | __ mov(r0, Operand(stack_limit)); |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 635 | __ ldr(r0, MemOperand(r0)); |
| 636 | __ sub(r0, sp, r0, SetCC); |
| 637 | // Handle it if the stack pointer is already below the stack limit. |
| 638 | __ b(ls, &stack_limit_hit); |
| 639 | // Check if there is room for the variable number of registers above |
| 640 | // the stack limit. |
| 641 | __ cmp(r0, Operand(num_registers_ * kPointerSize)); |
| 642 | __ b(hs, &stack_ok); |
| 643 | // Exit with OutOfMemory exception. There is not enough space on the stack |
| 644 | // for our working registers. |
| 645 | __ mov(r0, Operand(EXCEPTION)); |
| 646 | __ jmp(&exit_label_); |
| 647 | |
| 648 | __ bind(&stack_limit_hit); |
| 649 | CallCheckStackGuardState(r0); |
ager@chromium.org | 5b2fbee | 2010-09-08 06:38:15 +0000 | [diff] [blame] | 650 | __ cmp(r0, Operand(0, RelocInfo::NONE)); |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 651 | // If returned value is non-zero, we exit with the returned value as result. |
| 652 | __ b(ne, &exit_label_); |
| 653 | |
| 654 | __ bind(&stack_ok); |
| 655 | |
| 656 | // Allocate space on stack for registers. |
| 657 | __ sub(sp, sp, Operand(num_registers_ * kPointerSize)); |
| 658 | // Load string end. |
| 659 | __ ldr(end_of_input_address(), MemOperand(frame_pointer(), kInputEnd)); |
| 660 | // Load input start. |
| 661 | __ ldr(r0, MemOperand(frame_pointer(), kInputStart)); |
| 662 | // Find negative length (offset of start relative to end). |
| 663 | __ sub(current_input_offset(), r0, end_of_input_address()); |
whesse@chromium.org | cec079d | 2010-03-22 14:44:04 +0000 | [diff] [blame] | 664 | // Set r0 to address of char before start of the input string |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 665 | // (effectively string position -1). |
whesse@chromium.org | cec079d | 2010-03-22 14:44:04 +0000 | [diff] [blame] | 666 | __ ldr(r1, MemOperand(frame_pointer(), kStartIndex)); |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 667 | __ sub(r0, current_input_offset(), Operand(char_size())); |
whesse@chromium.org | cec079d | 2010-03-22 14:44:04 +0000 | [diff] [blame] | 668 | __ sub(r0, r0, Operand(r1, LSL, (mode_ == UC16) ? 1 : 0)); |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 669 | // Store this value in a local variable, for use when clearing |
| 670 | // position registers. |
| 671 | __ str(r0, MemOperand(frame_pointer(), kInputStartMinusOne)); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 672 | |
| 673 | // Determine whether the start index is zero, that is at the start of the |
| 674 | // string, and store that value in a local variable. |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 675 | __ tst(r1, Operand(r1)); |
| 676 | __ mov(r1, Operand(1), LeaveCC, eq); |
ager@chromium.org | 5b2fbee | 2010-09-08 06:38:15 +0000 | [diff] [blame] | 677 | __ mov(r1, Operand(0, RelocInfo::NONE), LeaveCC, ne); |
sgjesse@chromium.org | b302e56 | 2010-02-03 11:26:59 +0000 | [diff] [blame] | 678 | __ str(r1, MemOperand(frame_pointer(), kAtStart)); |
| 679 | |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 680 | if (num_saved_registers_ > 0) { // Always is, if generated from a regexp. |
| 681 | // Fill saved registers with initial value = start offset - 1 |
| 682 | |
| 683 | // Address of register 0. |
| 684 | __ add(r1, frame_pointer(), Operand(kRegisterZero)); |
| 685 | __ mov(r2, Operand(num_saved_registers_)); |
| 686 | Label init_loop; |
| 687 | __ bind(&init_loop); |
| 688 | __ str(r0, MemOperand(r1, kPointerSize, NegPostIndex)); |
| 689 | __ sub(r2, r2, Operand(1), SetCC); |
| 690 | __ b(ne, &init_loop); |
| 691 | } |
| 692 | |
| 693 | // Initialize backtrack stack pointer. |
| 694 | __ ldr(backtrack_stackpointer(), MemOperand(frame_pointer(), kStackHighEnd)); |
| 695 | // Initialize code pointer register |
| 696 | __ mov(code_pointer(), Operand(masm_->CodeObject())); |
| 697 | // Load previous char as initial value of current character register. |
| 698 | Label at_start; |
| 699 | __ ldr(r0, MemOperand(frame_pointer(), kAtStart)); |
ager@chromium.org | 5b2fbee | 2010-09-08 06:38:15 +0000 | [diff] [blame] | 700 | __ cmp(r0, Operand(0, RelocInfo::NONE)); |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 701 | __ b(ne, &at_start); |
| 702 | LoadCurrentCharacterUnchecked(-1, 1); // Load previous char. |
| 703 | __ jmp(&start_label_); |
| 704 | __ bind(&at_start); |
| 705 | __ mov(current_character(), Operand('\n')); |
| 706 | __ jmp(&start_label_); |
| 707 | |
| 708 | |
| 709 | // Exit code: |
| 710 | if (success_label_.is_linked()) { |
| 711 | // Save captures when successful. |
| 712 | __ bind(&success_label_); |
| 713 | if (num_saved_registers_ > 0) { |
| 714 | // copy captures to output |
| 715 | __ ldr(r1, MemOperand(frame_pointer(), kInputStart)); |
| 716 | __ ldr(r0, MemOperand(frame_pointer(), kRegisterOutput)); |
whesse@chromium.org | cec079d | 2010-03-22 14:44:04 +0000 | [diff] [blame] | 717 | __ ldr(r2, MemOperand(frame_pointer(), kStartIndex)); |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 718 | __ sub(r1, end_of_input_address(), r1); |
| 719 | // r1 is length of input in bytes. |
| 720 | if (mode_ == UC16) { |
| 721 | __ mov(r1, Operand(r1, LSR, 1)); |
| 722 | } |
| 723 | // r1 is length of input in characters. |
whesse@chromium.org | cec079d | 2010-03-22 14:44:04 +0000 | [diff] [blame] | 724 | __ add(r1, r1, Operand(r2)); |
| 725 | // r1 is length of string in characters. |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 726 | |
| 727 | ASSERT_EQ(0, num_saved_registers_ % 2); |
| 728 | // Always an even number of capture registers. This allows us to |
| 729 | // unroll the loop once to add an operation between a load of a register |
| 730 | // and the following use of that register. |
| 731 | for (int i = 0; i < num_saved_registers_; i += 2) { |
| 732 | __ ldr(r2, register_location(i)); |
| 733 | __ ldr(r3, register_location(i + 1)); |
| 734 | if (mode_ == UC16) { |
| 735 | __ add(r2, r1, Operand(r2, ASR, 1)); |
| 736 | __ add(r3, r1, Operand(r3, ASR, 1)); |
| 737 | } else { |
| 738 | __ add(r2, r1, Operand(r2)); |
| 739 | __ add(r3, r1, Operand(r3)); |
| 740 | } |
| 741 | __ str(r2, MemOperand(r0, kPointerSize, PostIndex)); |
| 742 | __ str(r3, MemOperand(r0, kPointerSize, PostIndex)); |
| 743 | } |
| 744 | } |
| 745 | __ mov(r0, Operand(SUCCESS)); |
| 746 | } |
| 747 | // Exit and return r0 |
| 748 | __ bind(&exit_label_); |
| 749 | // Skip sp past regexp registers and local variables.. |
| 750 | __ mov(sp, frame_pointer()); |
| 751 | // Restore registers r4..r11 and return (restoring lr to pc). |
| 752 | __ ldm(ia_w, sp, registers_to_retain | pc.bit()); |
| 753 | |
| 754 | // Backtrack code (branch target for conditional backtracks). |
| 755 | if (backtrack_label_.is_linked()) { |
| 756 | __ bind(&backtrack_label_); |
| 757 | Backtrack(); |
| 758 | } |
| 759 | |
| 760 | Label exit_with_exception; |
| 761 | |
| 762 | // Preempt-code |
| 763 | if (check_preempt_label_.is_linked()) { |
| 764 | SafeCallTarget(&check_preempt_label_); |
| 765 | |
| 766 | CallCheckStackGuardState(r0); |
ager@chromium.org | 5b2fbee | 2010-09-08 06:38:15 +0000 | [diff] [blame] | 767 | __ cmp(r0, Operand(0, RelocInfo::NONE)); |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 768 | // If returning non-zero, we should end execution with the given |
| 769 | // result as return value. |
| 770 | __ b(ne, &exit_label_); |
| 771 | |
| 772 | // String might have moved: Reload end of string from frame. |
| 773 | __ ldr(end_of_input_address(), MemOperand(frame_pointer(), kInputEnd)); |
| 774 | SafeReturn(); |
| 775 | } |
| 776 | |
| 777 | // Backtrack stack overflow code. |
| 778 | if (stack_overflow_label_.is_linked()) { |
| 779 | SafeCallTarget(&stack_overflow_label_); |
| 780 | // Reached if the backtrack-stack limit has been hit. |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 781 | Label grow_failed; |
| 782 | |
kmillikin@chromium.org | 49edbdf | 2011-02-16 12:32:18 +0000 | [diff] [blame] | 783 | // Call GrowStack(backtrack_stackpointer(), &stack_base) |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 784 | static const int num_arguments = 3; |
ager@chromium.org | 357bf65 | 2010-04-12 11:30:10 +0000 | [diff] [blame] | 785 | __ PrepareCallCFunction(num_arguments, r0); |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 786 | __ mov(r0, backtrack_stackpointer()); |
| 787 | __ add(r1, frame_pointer(), Operand(kStackHighEnd)); |
kmillikin@chromium.org | c36ce6e | 2011-04-04 08:25:31 +0000 | [diff] [blame] | 788 | __ mov(r2, Operand(ExternalReference::isolate_address())); |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 789 | ExternalReference grow_stack = |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 790 | ExternalReference::re_grow_stack(masm_->isolate()); |
ager@chromium.org | 357bf65 | 2010-04-12 11:30:10 +0000 | [diff] [blame] | 791 | __ CallCFunction(grow_stack, num_arguments); |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 792 | // If return NULL, we have failed to grow the stack, and |
| 793 | // must exit with a stack-overflow exception. |
ager@chromium.org | 5b2fbee | 2010-09-08 06:38:15 +0000 | [diff] [blame] | 794 | __ cmp(r0, Operand(0, RelocInfo::NONE)); |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 795 | __ b(eq, &exit_with_exception); |
| 796 | // Otherwise use return value as new stack pointer. |
| 797 | __ mov(backtrack_stackpointer(), r0); |
| 798 | // Restore saved registers and continue. |
| 799 | SafeReturn(); |
| 800 | } |
| 801 | |
| 802 | if (exit_with_exception.is_linked()) { |
| 803 | // If any of the code above needed to exit with an exception. |
| 804 | __ bind(&exit_with_exception); |
| 805 | // Exit with Result EXCEPTION(-1) to signal thrown exception. |
| 806 | __ mov(r0, Operand(EXCEPTION)); |
| 807 | __ jmp(&exit_label_); |
| 808 | } |
| 809 | |
| 810 | CodeDesc code_desc; |
| 811 | masm_->GetCode(&code_desc); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 812 | Handle<Code> code = FACTORY->NewCode(code_desc, |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 813 | Code::ComputeFlags(Code::REGEXP), |
| 814 | masm_->CodeObject()); |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 815 | PROFILE(Isolate::Current(), RegExpCodeCreateEvent(*code, *source)); |
karlklose@chromium.org | 83a4728 | 2011-05-11 11:54:09 +0000 | [diff] [blame] | 816 | return Handle<HeapObject>::cast(code); |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 817 | } |
| 818 | |
| 819 | |
| 820 | void RegExpMacroAssemblerARM::GoTo(Label* to) { |
| 821 | BranchOrBacktrack(al, to); |
| 822 | } |
| 823 | |
| 824 | |
| 825 | void RegExpMacroAssemblerARM::IfRegisterGE(int reg, |
| 826 | int comparand, |
| 827 | Label* if_ge) { |
| 828 | __ ldr(r0, register_location(reg)); |
| 829 | __ cmp(r0, Operand(comparand)); |
| 830 | BranchOrBacktrack(ge, if_ge); |
| 831 | } |
| 832 | |
| 833 | |
| 834 | void RegExpMacroAssemblerARM::IfRegisterLT(int reg, |
| 835 | int comparand, |
| 836 | Label* if_lt) { |
| 837 | __ ldr(r0, register_location(reg)); |
| 838 | __ cmp(r0, Operand(comparand)); |
| 839 | BranchOrBacktrack(lt, if_lt); |
| 840 | } |
| 841 | |
| 842 | |
| 843 | void RegExpMacroAssemblerARM::IfRegisterEqPos(int reg, |
| 844 | Label* if_eq) { |
| 845 | __ ldr(r0, register_location(reg)); |
| 846 | __ cmp(r0, Operand(current_input_offset())); |
| 847 | BranchOrBacktrack(eq, if_eq); |
| 848 | } |
| 849 | |
| 850 | |
| 851 | RegExpMacroAssembler::IrregexpImplementation |
| 852 | RegExpMacroAssemblerARM::Implementation() { |
| 853 | return kARMImplementation; |
| 854 | } |
| 855 | |
| 856 | |
| 857 | void RegExpMacroAssemblerARM::LoadCurrentCharacter(int cp_offset, |
| 858 | Label* on_end_of_input, |
| 859 | bool check_bounds, |
| 860 | int characters) { |
| 861 | ASSERT(cp_offset >= -1); // ^ and \b can look behind one character. |
| 862 | ASSERT(cp_offset < (1<<30)); // Be sane! (And ensure negation works) |
| 863 | if (check_bounds) { |
| 864 | CheckPosition(cp_offset + characters - 1, on_end_of_input); |
| 865 | } |
| 866 | LoadCurrentCharacterUnchecked(cp_offset, characters); |
| 867 | } |
| 868 | |
| 869 | |
| 870 | void RegExpMacroAssemblerARM::PopCurrentPosition() { |
| 871 | Pop(current_input_offset()); |
| 872 | } |
| 873 | |
| 874 | |
| 875 | void RegExpMacroAssemblerARM::PopRegister(int register_index) { |
| 876 | Pop(r0); |
| 877 | __ str(r0, register_location(register_index)); |
| 878 | } |
| 879 | |
| 880 | |
| 881 | static bool is_valid_memory_offset(int value) { |
| 882 | if (value < 0) value = -value; |
| 883 | return value < (1<<12); |
| 884 | } |
| 885 | |
| 886 | |
| 887 | void RegExpMacroAssemblerARM::PushBacktrack(Label* label) { |
| 888 | if (label->is_bound()) { |
| 889 | int target = label->pos(); |
| 890 | __ mov(r0, Operand(target + Code::kHeaderSize - kHeapObjectTag)); |
| 891 | } else { |
| 892 | int constant_offset = GetBacktrackConstantPoolEntry(); |
| 893 | masm_->label_at_put(label, constant_offset); |
| 894 | // Reading pc-relative is based on the address 8 bytes ahead of |
| 895 | // the current opcode. |
| 896 | unsigned int offset_of_pc_register_read = |
| 897 | masm_->pc_offset() + Assembler::kPcLoadDelta; |
| 898 | int pc_offset_of_constant = |
| 899 | constant_offset - offset_of_pc_register_read; |
| 900 | ASSERT(pc_offset_of_constant < 0); |
| 901 | if (is_valid_memory_offset(pc_offset_of_constant)) { |
| 902 | masm_->BlockConstPoolBefore(masm_->pc_offset() + Assembler::kInstrSize); |
| 903 | __ ldr(r0, MemOperand(pc, pc_offset_of_constant)); |
| 904 | } else { |
| 905 | // Not a 12-bit offset, so it needs to be loaded from the constant |
| 906 | // pool. |
| 907 | masm_->BlockConstPoolBefore( |
| 908 | masm_->pc_offset() + 2 * Assembler::kInstrSize); |
| 909 | __ mov(r0, Operand(pc_offset_of_constant + Assembler::kInstrSize)); |
| 910 | __ ldr(r0, MemOperand(pc, r0)); |
| 911 | } |
| 912 | } |
| 913 | Push(r0); |
| 914 | CheckStackLimit(); |
| 915 | } |
| 916 | |
| 917 | |
| 918 | void RegExpMacroAssemblerARM::PushCurrentPosition() { |
| 919 | Push(current_input_offset()); |
| 920 | } |
| 921 | |
| 922 | |
| 923 | void RegExpMacroAssemblerARM::PushRegister(int register_index, |
| 924 | StackCheckFlag check_stack_limit) { |
| 925 | __ ldr(r0, register_location(register_index)); |
| 926 | Push(r0); |
| 927 | if (check_stack_limit) CheckStackLimit(); |
| 928 | } |
| 929 | |
| 930 | |
| 931 | void RegExpMacroAssemblerARM::ReadCurrentPositionFromRegister(int reg) { |
| 932 | __ ldr(current_input_offset(), register_location(reg)); |
| 933 | } |
| 934 | |
| 935 | |
| 936 | void RegExpMacroAssemblerARM::ReadStackPointerFromRegister(int reg) { |
| 937 | __ ldr(backtrack_stackpointer(), register_location(reg)); |
| 938 | __ ldr(r0, MemOperand(frame_pointer(), kStackHighEnd)); |
| 939 | __ add(backtrack_stackpointer(), backtrack_stackpointer(), Operand(r0)); |
| 940 | } |
| 941 | |
| 942 | |
whesse@chromium.org | 4a5224e | 2010-10-20 12:37:07 +0000 | [diff] [blame] | 943 | void RegExpMacroAssemblerARM::SetCurrentPositionFromEnd(int by) { |
| 944 | Label after_position; |
| 945 | __ cmp(current_input_offset(), Operand(-by * char_size())); |
| 946 | __ b(ge, &after_position); |
| 947 | __ mov(current_input_offset(), Operand(-by * char_size())); |
| 948 | // On RegExp code entry (where this operation is used), the character before |
| 949 | // the current position is expected to be already loaded. |
| 950 | // We have advanced the position, so it's safe to read backwards. |
| 951 | LoadCurrentCharacterUnchecked(-1, 1); |
| 952 | __ bind(&after_position); |
| 953 | } |
| 954 | |
| 955 | |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 956 | void RegExpMacroAssemblerARM::SetRegister(int register_index, int to) { |
| 957 | ASSERT(register_index >= num_saved_registers_); // Reserved for positions! |
| 958 | __ mov(r0, Operand(to)); |
| 959 | __ str(r0, register_location(register_index)); |
| 960 | } |
| 961 | |
| 962 | |
| 963 | void RegExpMacroAssemblerARM::Succeed() { |
| 964 | __ jmp(&success_label_); |
| 965 | } |
| 966 | |
| 967 | |
| 968 | void RegExpMacroAssemblerARM::WriteCurrentPositionToRegister(int reg, |
| 969 | int cp_offset) { |
| 970 | if (cp_offset == 0) { |
| 971 | __ str(current_input_offset(), register_location(reg)); |
| 972 | } else { |
| 973 | __ add(r0, current_input_offset(), Operand(cp_offset * char_size())); |
| 974 | __ str(r0, register_location(reg)); |
| 975 | } |
| 976 | } |
| 977 | |
| 978 | |
| 979 | void RegExpMacroAssemblerARM::ClearRegisters(int reg_from, int reg_to) { |
| 980 | ASSERT(reg_from <= reg_to); |
| 981 | __ ldr(r0, MemOperand(frame_pointer(), kInputStartMinusOne)); |
| 982 | for (int reg = reg_from; reg <= reg_to; reg++) { |
| 983 | __ str(r0, register_location(reg)); |
| 984 | } |
| 985 | } |
| 986 | |
| 987 | |
| 988 | void RegExpMacroAssemblerARM::WriteStackPointerToRegister(int reg) { |
| 989 | __ ldr(r1, MemOperand(frame_pointer(), kStackHighEnd)); |
| 990 | __ sub(r0, backtrack_stackpointer(), r1); |
| 991 | __ str(r0, register_location(reg)); |
| 992 | } |
| 993 | |
| 994 | |
| 995 | // Private methods: |
| 996 | |
| 997 | void RegExpMacroAssemblerARM::CallCheckStackGuardState(Register scratch) { |
ager@chromium.org | ce5e87b | 2010-03-10 10:24:18 +0000 | [diff] [blame] | 998 | static const int num_arguments = 3; |
ager@chromium.org | 357bf65 | 2010-04-12 11:30:10 +0000 | [diff] [blame] | 999 | __ PrepareCallCFunction(num_arguments, scratch); |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 1000 | // RegExp code frame pointer. |
| 1001 | __ mov(r2, frame_pointer()); |
| 1002 | // Code* of self. |
| 1003 | __ mov(r1, Operand(masm_->CodeObject())); |
| 1004 | // r0 becomes return address pointer. |
| 1005 | ExternalReference stack_guard_check = |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1006 | ExternalReference::re_check_stack_guard_state(masm_->isolate()); |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 1007 | CallCFunctionUsingStub(stack_guard_check, num_arguments); |
| 1008 | } |
| 1009 | |
| 1010 | |
| 1011 | // Helper function for reading a value out of a stack frame. |
| 1012 | template <typename T> |
| 1013 | static T& frame_entry(Address re_frame, int frame_offset) { |
| 1014 | return reinterpret_cast<T&>(Memory::int32_at(re_frame + frame_offset)); |
| 1015 | } |
| 1016 | |
| 1017 | |
| 1018 | int RegExpMacroAssemblerARM::CheckStackGuardState(Address* return_address, |
| 1019 | Code* re_code, |
| 1020 | Address re_frame) { |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1021 | Isolate* isolate = frame_entry<Isolate*>(re_frame, kIsolate); |
| 1022 | ASSERT(isolate == Isolate::Current()); |
| 1023 | if (isolate->stack_guard()->IsStackOverflow()) { |
| 1024 | isolate->StackOverflow(); |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 1025 | return EXCEPTION; |
| 1026 | } |
| 1027 | |
| 1028 | // If not real stack overflow the stack guard was used to interrupt |
| 1029 | // execution for another purpose. |
| 1030 | |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 1031 | // If this is a direct call from JavaScript retry the RegExp forcing the call |
| 1032 | // through the runtime system. Currently the direct call cannot handle a GC. |
| 1033 | if (frame_entry<int>(re_frame, kDirectCall) == 1) { |
| 1034 | return RETRY; |
| 1035 | } |
| 1036 | |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 1037 | // Prepare for possible GC. |
| 1038 | HandleScope handles; |
| 1039 | Handle<Code> code_handle(re_code); |
| 1040 | |
| 1041 | Handle<String> subject(frame_entry<String*>(re_frame, kInputString)); |
| 1042 | // Current string. |
| 1043 | bool is_ascii = subject->IsAsciiRepresentation(); |
| 1044 | |
| 1045 | ASSERT(re_code->instruction_start() <= *return_address); |
| 1046 | ASSERT(*return_address <= |
| 1047 | re_code->instruction_start() + re_code->instruction_size()); |
| 1048 | |
lrn@chromium.org | 303ada7 | 2010-10-27 09:33:13 +0000 | [diff] [blame] | 1049 | MaybeObject* result = Execution::HandleStackGuardInterrupt(); |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 1050 | |
| 1051 | if (*code_handle != re_code) { // Return address no longer valid |
| 1052 | int delta = *code_handle - re_code; |
| 1053 | // Overwrite the return address on the stack. |
| 1054 | *return_address += delta; |
| 1055 | } |
| 1056 | |
| 1057 | if (result->IsException()) { |
| 1058 | return EXCEPTION; |
| 1059 | } |
| 1060 | |
| 1061 | // String might have changed. |
| 1062 | if (subject->IsAsciiRepresentation() != is_ascii) { |
| 1063 | // If we changed between an ASCII and an UC16 string, the specialized |
| 1064 | // code cannot be used, and we need to restart regexp matching from |
| 1065 | // scratch (including, potentially, compiling a new version of the code). |
| 1066 | return RETRY; |
| 1067 | } |
| 1068 | |
| 1069 | // Otherwise, the content of the string might have moved. It must still |
| 1070 | // be a sequential or external string with the same content. |
| 1071 | // Update the start and end pointers in the stack frame to the current |
| 1072 | // location (whether it has actually moved or not). |
| 1073 | ASSERT(StringShape(*subject).IsSequential() || |
| 1074 | StringShape(*subject).IsExternal()); |
| 1075 | |
| 1076 | // The original start address of the characters to match. |
| 1077 | const byte* start_address = frame_entry<const byte*>(re_frame, kInputStart); |
| 1078 | |
| 1079 | // Find the current start address of the same character at the current string |
| 1080 | // position. |
| 1081 | int start_index = frame_entry<int>(re_frame, kStartIndex); |
| 1082 | const byte* new_address = StringCharacterPosition(*subject, start_index); |
| 1083 | |
| 1084 | if (start_address != new_address) { |
| 1085 | // If there is a difference, update the object pointer and start and end |
| 1086 | // addresses in the RegExp stack frame to match the new value. |
| 1087 | const byte* end_address = frame_entry<const byte* >(re_frame, kInputEnd); |
| 1088 | int byte_length = end_address - start_address; |
| 1089 | frame_entry<const String*>(re_frame, kInputString) = *subject; |
| 1090 | frame_entry<const byte*>(re_frame, kInputStart) = new_address; |
| 1091 | frame_entry<const byte*>(re_frame, kInputEnd) = new_address + byte_length; |
| 1092 | } |
| 1093 | |
| 1094 | return 0; |
| 1095 | } |
| 1096 | |
| 1097 | |
| 1098 | MemOperand RegExpMacroAssemblerARM::register_location(int register_index) { |
| 1099 | ASSERT(register_index < (1<<30)); |
| 1100 | if (num_registers_ <= register_index) { |
| 1101 | num_registers_ = register_index + 1; |
| 1102 | } |
| 1103 | return MemOperand(frame_pointer(), |
| 1104 | kRegisterZero - register_index * kPointerSize); |
| 1105 | } |
| 1106 | |
| 1107 | |
| 1108 | void RegExpMacroAssemblerARM::CheckPosition(int cp_offset, |
| 1109 | Label* on_outside_input) { |
| 1110 | __ cmp(current_input_offset(), Operand(-cp_offset * char_size())); |
| 1111 | BranchOrBacktrack(ge, on_outside_input); |
| 1112 | } |
| 1113 | |
| 1114 | |
| 1115 | void RegExpMacroAssemblerARM::BranchOrBacktrack(Condition condition, |
| 1116 | Label* to) { |
| 1117 | if (condition == al) { // Unconditional. |
| 1118 | if (to == NULL) { |
| 1119 | Backtrack(); |
| 1120 | return; |
| 1121 | } |
| 1122 | __ jmp(to); |
| 1123 | return; |
| 1124 | } |
| 1125 | if (to == NULL) { |
| 1126 | __ b(condition, &backtrack_label_); |
| 1127 | return; |
| 1128 | } |
| 1129 | __ b(condition, to); |
| 1130 | } |
| 1131 | |
| 1132 | |
| 1133 | void RegExpMacroAssemblerARM::SafeCall(Label* to, Condition cond) { |
| 1134 | __ bl(to, cond); |
| 1135 | } |
| 1136 | |
| 1137 | |
| 1138 | void RegExpMacroAssemblerARM::SafeReturn() { |
| 1139 | __ pop(lr); |
| 1140 | __ add(pc, lr, Operand(masm_->CodeObject())); |
| 1141 | } |
| 1142 | |
| 1143 | |
| 1144 | void RegExpMacroAssemblerARM::SafeCallTarget(Label* name) { |
| 1145 | __ bind(name); |
| 1146 | __ sub(lr, lr, Operand(masm_->CodeObject())); |
| 1147 | __ push(lr); |
| 1148 | } |
| 1149 | |
| 1150 | |
| 1151 | void RegExpMacroAssemblerARM::Push(Register source) { |
| 1152 | ASSERT(!source.is(backtrack_stackpointer())); |
| 1153 | __ str(source, |
| 1154 | MemOperand(backtrack_stackpointer(), kPointerSize, NegPreIndex)); |
| 1155 | } |
| 1156 | |
| 1157 | |
| 1158 | void RegExpMacroAssemblerARM::Pop(Register target) { |
| 1159 | ASSERT(!target.is(backtrack_stackpointer())); |
| 1160 | __ ldr(target, |
| 1161 | MemOperand(backtrack_stackpointer(), kPointerSize, PostIndex)); |
| 1162 | } |
| 1163 | |
| 1164 | |
| 1165 | void RegExpMacroAssemblerARM::CheckPreemption() { |
| 1166 | // Check for preemption. |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 1167 | ExternalReference stack_limit = |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1168 | ExternalReference::address_of_stack_limit(masm_->isolate()); |
ager@chromium.org | c4c9272 | 2009-11-18 14:12:51 +0000 | [diff] [blame] | 1169 | __ mov(r0, Operand(stack_limit)); |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 1170 | __ ldr(r0, MemOperand(r0)); |
| 1171 | __ cmp(sp, r0); |
| 1172 | SafeCall(&check_preempt_label_, ls); |
| 1173 | } |
| 1174 | |
| 1175 | |
| 1176 | void RegExpMacroAssemblerARM::CheckStackLimit() { |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 1177 | ExternalReference stack_limit = |
sgjesse@chromium.org | ea88ce9 | 2011-03-23 11:19:56 +0000 | [diff] [blame] | 1178 | ExternalReference::address_of_regexp_stack_limit(masm_->isolate()); |
ager@chromium.org | 3811b43 | 2009-10-28 14:53:37 +0000 | [diff] [blame] | 1179 | __ mov(r0, Operand(stack_limit)); |
| 1180 | __ ldr(r0, MemOperand(r0)); |
| 1181 | __ cmp(backtrack_stackpointer(), Operand(r0)); |
| 1182 | SafeCall(&stack_overflow_label_, ls); |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 1183 | } |
| 1184 | |
| 1185 | |
| 1186 | void RegExpMacroAssemblerARM::EmitBacktrackConstantPool() { |
| 1187 | __ CheckConstPool(false, false); |
| 1188 | __ BlockConstPoolBefore( |
| 1189 | masm_->pc_offset() + kBacktrackConstantPoolSize * Assembler::kInstrSize); |
| 1190 | backtrack_constant_pool_offset_ = masm_->pc_offset(); |
| 1191 | for (int i = 0; i < kBacktrackConstantPoolSize; i++) { |
| 1192 | __ emit(0); |
| 1193 | } |
| 1194 | |
| 1195 | backtrack_constant_pool_capacity_ = kBacktrackConstantPoolSize; |
| 1196 | } |
| 1197 | |
| 1198 | |
| 1199 | int RegExpMacroAssemblerARM::GetBacktrackConstantPoolEntry() { |
| 1200 | while (backtrack_constant_pool_capacity_ > 0) { |
| 1201 | int offset = backtrack_constant_pool_offset_; |
| 1202 | backtrack_constant_pool_offset_ += kPointerSize; |
| 1203 | backtrack_constant_pool_capacity_--; |
| 1204 | if (masm_->pc_offset() - offset < 2 * KB) { |
| 1205 | return offset; |
| 1206 | } |
| 1207 | } |
| 1208 | Label new_pool_skip; |
| 1209 | __ jmp(&new_pool_skip); |
| 1210 | EmitBacktrackConstantPool(); |
| 1211 | __ bind(&new_pool_skip); |
| 1212 | int offset = backtrack_constant_pool_offset_; |
| 1213 | backtrack_constant_pool_offset_ += kPointerSize; |
| 1214 | backtrack_constant_pool_capacity_--; |
| 1215 | return offset; |
| 1216 | } |
| 1217 | |
| 1218 | |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 1219 | void RegExpMacroAssemblerARM::CallCFunctionUsingStub( |
| 1220 | ExternalReference function, |
| 1221 | int num_arguments) { |
| 1222 | // Must pass all arguments in registers. The stub pushes on the stack. |
| 1223 | ASSERT(num_arguments <= 4); |
ager@chromium.org | 357bf65 | 2010-04-12 11:30:10 +0000 | [diff] [blame] | 1224 | __ mov(code_pointer(), Operand(function)); |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 1225 | RegExpCEntryStub stub; |
| 1226 | __ CallStub(&stub); |
| 1227 | if (OS::ActivationFrameAlignment() != 0) { |
| 1228 | __ ldr(sp, MemOperand(sp, 0)); |
| 1229 | } |
| 1230 | __ mov(code_pointer(), Operand(masm_->CodeObject())); |
| 1231 | } |
| 1232 | |
| 1233 | |
| 1234 | void RegExpMacroAssemblerARM::LoadCurrentCharacterUnchecked(int cp_offset, |
| 1235 | int characters) { |
| 1236 | Register offset = current_input_offset(); |
| 1237 | if (cp_offset != 0) { |
| 1238 | __ add(r0, current_input_offset(), Operand(cp_offset * char_size())); |
| 1239 | offset = r0; |
| 1240 | } |
sgjesse@chromium.org | 720dc0b | 2010-05-10 09:25:39 +0000 | [diff] [blame] | 1241 | // The ldr, str, ldrh, strh instructions can do unaligned accesses, if the CPU |
| 1242 | // and the operating system running on the target allow it. |
| 1243 | // If unaligned load/stores are not supported then this function must only |
| 1244 | // be used to load a single character at a time. |
| 1245 | #if !V8_TARGET_CAN_READ_UNALIGNED |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 1246 | ASSERT(characters == 1); |
sgjesse@chromium.org | 720dc0b | 2010-05-10 09:25:39 +0000 | [diff] [blame] | 1247 | #endif |
| 1248 | |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 1249 | if (mode_ == ASCII) { |
sgjesse@chromium.org | 720dc0b | 2010-05-10 09:25:39 +0000 | [diff] [blame] | 1250 | if (characters == 4) { |
| 1251 | __ ldr(current_character(), MemOperand(end_of_input_address(), offset)); |
| 1252 | } else if (characters == 2) { |
| 1253 | __ ldrh(current_character(), MemOperand(end_of_input_address(), offset)); |
| 1254 | } else { |
| 1255 | ASSERT(characters == 1); |
| 1256 | __ ldrb(current_character(), MemOperand(end_of_input_address(), offset)); |
| 1257 | } |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 1258 | } else { |
| 1259 | ASSERT(mode_ == UC16); |
sgjesse@chromium.org | 720dc0b | 2010-05-10 09:25:39 +0000 | [diff] [blame] | 1260 | if (characters == 2) { |
| 1261 | __ ldr(current_character(), MemOperand(end_of_input_address(), offset)); |
| 1262 | } else { |
| 1263 | ASSERT(characters == 1); |
| 1264 | __ ldrh(current_character(), MemOperand(end_of_input_address(), offset)); |
| 1265 | } |
ager@chromium.org | 18ad94b | 2009-09-02 08:22:29 +0000 | [diff] [blame] | 1266 | } |
| 1267 | } |
| 1268 | |
| 1269 | |
| 1270 | void RegExpCEntryStub::Generate(MacroAssembler* masm_) { |
| 1271 | int stack_alignment = OS::ActivationFrameAlignment(); |
| 1272 | if (stack_alignment < kPointerSize) stack_alignment = kPointerSize; |
| 1273 | // Stack is already aligned for call, so decrement by alignment |
| 1274 | // to make room for storing the link register. |
| 1275 | __ str(lr, MemOperand(sp, stack_alignment, NegPreIndex)); |
| 1276 | __ mov(r0, sp); |
| 1277 | __ Call(r5); |
| 1278 | __ ldr(pc, MemOperand(sp, stack_alignment, PostIndex)); |
| 1279 | } |
| 1280 | |
| 1281 | #undef __ |
| 1282 | |
ricow@chromium.org | c9c8082 | 2010-04-21 08:22:37 +0000 | [diff] [blame] | 1283 | #endif // V8_INTERPRETED_REGEXP |
ager@chromium.org | a74f0da | 2008-12-03 16:05:52 +0000 | [diff] [blame] | 1284 | |
| 1285 | }} // namespace v8::internal |
erik.corry@gmail.com | 9dfbea4 | 2010-05-21 12:58:28 +0000 | [diff] [blame] | 1286 | |
| 1287 | #endif // V8_TARGET_ARCH_ARM |