ricow@chromium.org | 65fae84 | 2010-08-25 15:26:24 +0000 | [diff] [blame^] | 1 | // Copyright 2010 the V8 project authors. All rights reserved. |
| 2 | // Redistribution and use in source and binary forms, with or without |
| 3 | // modification, are permitted provided that the following conditions are |
| 4 | // met: |
| 5 | // |
| 6 | // * Redistributions of source code must retain the above copyright |
| 7 | // notice, this list of conditions and the following disclaimer. |
| 8 | // * Redistributions in binary form must reproduce the above |
| 9 | // copyright notice, this list of conditions and the following |
| 10 | // disclaimer in the documentation and/or other materials provided |
| 11 | // with the distribution. |
| 12 | // * Neither the name of Google Inc. nor the names of its |
| 13 | // contributors may be used to endorse or promote products derived |
| 14 | // from this software without specific prior written permission. |
| 15 | // |
| 16 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 17 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 18 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 19 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 20 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 21 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 22 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 26 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | |
| 28 | #include "v8.h" |
| 29 | |
| 30 | #if defined(V8_TARGET_ARCH_IA32) |
| 31 | |
| 32 | #include "bootstrapper.h" |
| 33 | #include "code-stubs-ia32.h" |
| 34 | #include "codegen-inl.h" |
| 35 | #include "regexp-macro-assembler.h" |
| 36 | |
| 37 | namespace v8 { |
| 38 | namespace internal { |
| 39 | |
| 40 | #define __ ACCESS_MASM(masm) |
| 41 | void FastNewClosureStub::Generate(MacroAssembler* masm) { |
| 42 | // Create a new closure from the given function info in new |
| 43 | // space. Set the context to the current context in esi. |
| 44 | Label gc; |
| 45 | __ AllocateInNewSpace(JSFunction::kSize, eax, ebx, ecx, &gc, TAG_OBJECT); |
| 46 | |
| 47 | // Get the function info from the stack. |
| 48 | __ mov(edx, Operand(esp, 1 * kPointerSize)); |
| 49 | |
| 50 | // Compute the function map in the current global context and set that |
| 51 | // as the map of the allocated object. |
| 52 | __ mov(ecx, Operand(esi, Context::SlotOffset(Context::GLOBAL_INDEX))); |
| 53 | __ mov(ecx, FieldOperand(ecx, GlobalObject::kGlobalContextOffset)); |
| 54 | __ mov(ecx, Operand(ecx, Context::SlotOffset(Context::FUNCTION_MAP_INDEX))); |
| 55 | __ mov(FieldOperand(eax, JSObject::kMapOffset), ecx); |
| 56 | |
| 57 | // Initialize the rest of the function. We don't have to update the |
| 58 | // write barrier because the allocated object is in new space. |
| 59 | __ mov(ebx, Immediate(Factory::empty_fixed_array())); |
| 60 | __ mov(FieldOperand(eax, JSObject::kPropertiesOffset), ebx); |
| 61 | __ mov(FieldOperand(eax, JSObject::kElementsOffset), ebx); |
| 62 | __ mov(FieldOperand(eax, JSFunction::kPrototypeOrInitialMapOffset), |
| 63 | Immediate(Factory::the_hole_value())); |
| 64 | __ mov(FieldOperand(eax, JSFunction::kSharedFunctionInfoOffset), edx); |
| 65 | __ mov(FieldOperand(eax, JSFunction::kContextOffset), esi); |
| 66 | __ mov(FieldOperand(eax, JSFunction::kLiteralsOffset), ebx); |
| 67 | |
| 68 | // Initialize the code pointer in the function to be the one |
| 69 | // found in the shared function info object. |
| 70 | __ mov(edx, FieldOperand(edx, SharedFunctionInfo::kCodeOffset)); |
| 71 | __ lea(edx, FieldOperand(edx, Code::kHeaderSize)); |
| 72 | __ mov(FieldOperand(eax, JSFunction::kCodeEntryOffset), edx); |
| 73 | |
| 74 | // Return and remove the on-stack parameter. |
| 75 | __ ret(1 * kPointerSize); |
| 76 | |
| 77 | // Create a new closure through the slower runtime call. |
| 78 | __ bind(&gc); |
| 79 | __ pop(ecx); // Temporarily remove return address. |
| 80 | __ pop(edx); |
| 81 | __ push(esi); |
| 82 | __ push(edx); |
| 83 | __ push(ecx); // Restore return address. |
| 84 | __ TailCallRuntime(Runtime::kNewClosure, 2, 1); |
| 85 | } |
| 86 | |
| 87 | |
| 88 | void FastNewContextStub::Generate(MacroAssembler* masm) { |
| 89 | // Try to allocate the context in new space. |
| 90 | Label gc; |
| 91 | int length = slots_ + Context::MIN_CONTEXT_SLOTS; |
| 92 | __ AllocateInNewSpace((length * kPointerSize) + FixedArray::kHeaderSize, |
| 93 | eax, ebx, ecx, &gc, TAG_OBJECT); |
| 94 | |
| 95 | // Get the function from the stack. |
| 96 | __ mov(ecx, Operand(esp, 1 * kPointerSize)); |
| 97 | |
| 98 | // Setup the object header. |
| 99 | __ mov(FieldOperand(eax, HeapObject::kMapOffset), Factory::context_map()); |
| 100 | __ mov(FieldOperand(eax, Context::kLengthOffset), |
| 101 | Immediate(Smi::FromInt(length))); |
| 102 | |
| 103 | // Setup the fixed slots. |
| 104 | __ xor_(ebx, Operand(ebx)); // Set to NULL. |
| 105 | __ mov(Operand(eax, Context::SlotOffset(Context::CLOSURE_INDEX)), ecx); |
| 106 | __ mov(Operand(eax, Context::SlotOffset(Context::FCONTEXT_INDEX)), eax); |
| 107 | __ mov(Operand(eax, Context::SlotOffset(Context::PREVIOUS_INDEX)), ebx); |
| 108 | __ mov(Operand(eax, Context::SlotOffset(Context::EXTENSION_INDEX)), ebx); |
| 109 | |
| 110 | // Copy the global object from the surrounding context. We go through the |
| 111 | // context in the function (ecx) to match the allocation behavior we have |
| 112 | // in the runtime system (see Heap::AllocateFunctionContext). |
| 113 | __ mov(ebx, FieldOperand(ecx, JSFunction::kContextOffset)); |
| 114 | __ mov(ebx, Operand(ebx, Context::SlotOffset(Context::GLOBAL_INDEX))); |
| 115 | __ mov(Operand(eax, Context::SlotOffset(Context::GLOBAL_INDEX)), ebx); |
| 116 | |
| 117 | // Initialize the rest of the slots to undefined. |
| 118 | __ mov(ebx, Factory::undefined_value()); |
| 119 | for (int i = Context::MIN_CONTEXT_SLOTS; i < length; i++) { |
| 120 | __ mov(Operand(eax, Context::SlotOffset(i)), ebx); |
| 121 | } |
| 122 | |
| 123 | // Return and remove the on-stack parameter. |
| 124 | __ mov(esi, Operand(eax)); |
| 125 | __ ret(1 * kPointerSize); |
| 126 | |
| 127 | // Need to collect. Call into runtime system. |
| 128 | __ bind(&gc); |
| 129 | __ TailCallRuntime(Runtime::kNewContext, 1, 1); |
| 130 | } |
| 131 | |
| 132 | |
| 133 | void FastCloneShallowArrayStub::Generate(MacroAssembler* masm) { |
| 134 | // Stack layout on entry: |
| 135 | // |
| 136 | // [esp + kPointerSize]: constant elements. |
| 137 | // [esp + (2 * kPointerSize)]: literal index. |
| 138 | // [esp + (3 * kPointerSize)]: literals array. |
| 139 | |
| 140 | // All sizes here are multiples of kPointerSize. |
| 141 | int elements_size = (length_ > 0) ? FixedArray::SizeFor(length_) : 0; |
| 142 | int size = JSArray::kSize + elements_size; |
| 143 | |
| 144 | // Load boilerplate object into ecx and check if we need to create a |
| 145 | // boilerplate. |
| 146 | Label slow_case; |
| 147 | __ mov(ecx, Operand(esp, 3 * kPointerSize)); |
| 148 | __ mov(eax, Operand(esp, 2 * kPointerSize)); |
| 149 | STATIC_ASSERT(kPointerSize == 4); |
| 150 | STATIC_ASSERT(kSmiTagSize == 1); |
| 151 | STATIC_ASSERT(kSmiTag == 0); |
| 152 | __ mov(ecx, CodeGenerator::FixedArrayElementOperand(ecx, eax)); |
| 153 | __ cmp(ecx, Factory::undefined_value()); |
| 154 | __ j(equal, &slow_case); |
| 155 | |
| 156 | if (FLAG_debug_code) { |
| 157 | const char* message; |
| 158 | Handle<Map> expected_map; |
| 159 | if (mode_ == CLONE_ELEMENTS) { |
| 160 | message = "Expected (writable) fixed array"; |
| 161 | expected_map = Factory::fixed_array_map(); |
| 162 | } else { |
| 163 | ASSERT(mode_ == COPY_ON_WRITE_ELEMENTS); |
| 164 | message = "Expected copy-on-write fixed array"; |
| 165 | expected_map = Factory::fixed_cow_array_map(); |
| 166 | } |
| 167 | __ push(ecx); |
| 168 | __ mov(ecx, FieldOperand(ecx, JSArray::kElementsOffset)); |
| 169 | __ cmp(FieldOperand(ecx, HeapObject::kMapOffset), expected_map); |
| 170 | __ Assert(equal, message); |
| 171 | __ pop(ecx); |
| 172 | } |
| 173 | |
| 174 | // Allocate both the JS array and the elements array in one big |
| 175 | // allocation. This avoids multiple limit checks. |
| 176 | __ AllocateInNewSpace(size, eax, ebx, edx, &slow_case, TAG_OBJECT); |
| 177 | |
| 178 | // Copy the JS array part. |
| 179 | for (int i = 0; i < JSArray::kSize; i += kPointerSize) { |
| 180 | if ((i != JSArray::kElementsOffset) || (length_ == 0)) { |
| 181 | __ mov(ebx, FieldOperand(ecx, i)); |
| 182 | __ mov(FieldOperand(eax, i), ebx); |
| 183 | } |
| 184 | } |
| 185 | |
| 186 | if (length_ > 0) { |
| 187 | // Get hold of the elements array of the boilerplate and setup the |
| 188 | // elements pointer in the resulting object. |
| 189 | __ mov(ecx, FieldOperand(ecx, JSArray::kElementsOffset)); |
| 190 | __ lea(edx, Operand(eax, JSArray::kSize)); |
| 191 | __ mov(FieldOperand(eax, JSArray::kElementsOffset), edx); |
| 192 | |
| 193 | // Copy the elements array. |
| 194 | for (int i = 0; i < elements_size; i += kPointerSize) { |
| 195 | __ mov(ebx, FieldOperand(ecx, i)); |
| 196 | __ mov(FieldOperand(edx, i), ebx); |
| 197 | } |
| 198 | } |
| 199 | |
| 200 | // Return and remove the on-stack parameters. |
| 201 | __ ret(3 * kPointerSize); |
| 202 | |
| 203 | __ bind(&slow_case); |
| 204 | __ TailCallRuntime(Runtime::kCreateArrayLiteralShallow, 3, 1); |
| 205 | } |
| 206 | |
| 207 | |
| 208 | // NOTE: The stub does not handle the inlined cases (Smis, Booleans, undefined). |
| 209 | void ToBooleanStub::Generate(MacroAssembler* masm) { |
| 210 | Label false_result, true_result, not_string; |
| 211 | __ mov(eax, Operand(esp, 1 * kPointerSize)); |
| 212 | |
| 213 | // 'null' => false. |
| 214 | __ cmp(eax, Factory::null_value()); |
| 215 | __ j(equal, &false_result); |
| 216 | |
| 217 | // Get the map and type of the heap object. |
| 218 | __ mov(edx, FieldOperand(eax, HeapObject::kMapOffset)); |
| 219 | __ movzx_b(ecx, FieldOperand(edx, Map::kInstanceTypeOffset)); |
| 220 | |
| 221 | // Undetectable => false. |
| 222 | __ test_b(FieldOperand(edx, Map::kBitFieldOffset), |
| 223 | 1 << Map::kIsUndetectable); |
| 224 | __ j(not_zero, &false_result); |
| 225 | |
| 226 | // JavaScript object => true. |
| 227 | __ CmpInstanceType(edx, FIRST_JS_OBJECT_TYPE); |
| 228 | __ j(above_equal, &true_result); |
| 229 | |
| 230 | // String value => false iff empty. |
| 231 | __ CmpInstanceType(edx, FIRST_NONSTRING_TYPE); |
| 232 | __ j(above_equal, ¬_string); |
| 233 | STATIC_ASSERT(kSmiTag == 0); |
| 234 | __ cmp(FieldOperand(eax, String::kLengthOffset), Immediate(0)); |
| 235 | __ j(zero, &false_result); |
| 236 | __ jmp(&true_result); |
| 237 | |
| 238 | __ bind(¬_string); |
| 239 | // HeapNumber => false iff +0, -0, or NaN. |
| 240 | __ cmp(edx, Factory::heap_number_map()); |
| 241 | __ j(not_equal, &true_result); |
| 242 | __ fldz(); |
| 243 | __ fld_d(FieldOperand(eax, HeapNumber::kValueOffset)); |
| 244 | __ FCmp(); |
| 245 | __ j(zero, &false_result); |
| 246 | // Fall through to |true_result|. |
| 247 | |
| 248 | // Return 1/0 for true/false in eax. |
| 249 | __ bind(&true_result); |
| 250 | __ mov(eax, 1); |
| 251 | __ ret(1 * kPointerSize); |
| 252 | __ bind(&false_result); |
| 253 | __ mov(eax, 0); |
| 254 | __ ret(1 * kPointerSize); |
| 255 | } |
| 256 | |
| 257 | |
| 258 | const char* GenericBinaryOpStub::GetName() { |
| 259 | if (name_ != NULL) return name_; |
| 260 | const int kMaxNameLength = 100; |
| 261 | name_ = Bootstrapper::AllocateAutoDeletedArray(kMaxNameLength); |
| 262 | if (name_ == NULL) return "OOM"; |
| 263 | const char* op_name = Token::Name(op_); |
| 264 | const char* overwrite_name; |
| 265 | switch (mode_) { |
| 266 | case NO_OVERWRITE: overwrite_name = "Alloc"; break; |
| 267 | case OVERWRITE_RIGHT: overwrite_name = "OverwriteRight"; break; |
| 268 | case OVERWRITE_LEFT: overwrite_name = "OverwriteLeft"; break; |
| 269 | default: overwrite_name = "UnknownOverwrite"; break; |
| 270 | } |
| 271 | |
| 272 | OS::SNPrintF(Vector<char>(name_, kMaxNameLength), |
| 273 | "GenericBinaryOpStub_%s_%s%s_%s%s_%s_%s", |
| 274 | op_name, |
| 275 | overwrite_name, |
| 276 | (flags_ & NO_SMI_CODE_IN_STUB) ? "_NoSmiInStub" : "", |
| 277 | args_in_registers_ ? "RegArgs" : "StackArgs", |
| 278 | args_reversed_ ? "_R" : "", |
| 279 | static_operands_type_.ToString(), |
| 280 | BinaryOpIC::GetName(runtime_operands_type_)); |
| 281 | return name_; |
| 282 | } |
| 283 | |
| 284 | |
| 285 | void GenericBinaryOpStub::GenerateCall( |
| 286 | MacroAssembler* masm, |
| 287 | Register left, |
| 288 | Register right) { |
| 289 | if (!ArgsInRegistersSupported()) { |
| 290 | // Pass arguments on the stack. |
| 291 | __ push(left); |
| 292 | __ push(right); |
| 293 | } else { |
| 294 | // The calling convention with registers is left in edx and right in eax. |
| 295 | Register left_arg = edx; |
| 296 | Register right_arg = eax; |
| 297 | if (!(left.is(left_arg) && right.is(right_arg))) { |
| 298 | if (left.is(right_arg) && right.is(left_arg)) { |
| 299 | if (IsOperationCommutative()) { |
| 300 | SetArgsReversed(); |
| 301 | } else { |
| 302 | __ xchg(left, right); |
| 303 | } |
| 304 | } else if (left.is(left_arg)) { |
| 305 | __ mov(right_arg, right); |
| 306 | } else if (right.is(right_arg)) { |
| 307 | __ mov(left_arg, left); |
| 308 | } else if (left.is(right_arg)) { |
| 309 | if (IsOperationCommutative()) { |
| 310 | __ mov(left_arg, right); |
| 311 | SetArgsReversed(); |
| 312 | } else { |
| 313 | // Order of moves important to avoid destroying left argument. |
| 314 | __ mov(left_arg, left); |
| 315 | __ mov(right_arg, right); |
| 316 | } |
| 317 | } else if (right.is(left_arg)) { |
| 318 | if (IsOperationCommutative()) { |
| 319 | __ mov(right_arg, left); |
| 320 | SetArgsReversed(); |
| 321 | } else { |
| 322 | // Order of moves important to avoid destroying right argument. |
| 323 | __ mov(right_arg, right); |
| 324 | __ mov(left_arg, left); |
| 325 | } |
| 326 | } else { |
| 327 | // Order of moves is not important. |
| 328 | __ mov(left_arg, left); |
| 329 | __ mov(right_arg, right); |
| 330 | } |
| 331 | } |
| 332 | |
| 333 | // Update flags to indicate that arguments are in registers. |
| 334 | SetArgsInRegisters(); |
| 335 | __ IncrementCounter(&Counters::generic_binary_stub_calls_regs, 1); |
| 336 | } |
| 337 | |
| 338 | // Call the stub. |
| 339 | __ CallStub(this); |
| 340 | } |
| 341 | |
| 342 | |
| 343 | void GenericBinaryOpStub::GenerateCall( |
| 344 | MacroAssembler* masm, |
| 345 | Register left, |
| 346 | Smi* right) { |
| 347 | if (!ArgsInRegistersSupported()) { |
| 348 | // Pass arguments on the stack. |
| 349 | __ push(left); |
| 350 | __ push(Immediate(right)); |
| 351 | } else { |
| 352 | // The calling convention with registers is left in edx and right in eax. |
| 353 | Register left_arg = edx; |
| 354 | Register right_arg = eax; |
| 355 | if (left.is(left_arg)) { |
| 356 | __ mov(right_arg, Immediate(right)); |
| 357 | } else if (left.is(right_arg) && IsOperationCommutative()) { |
| 358 | __ mov(left_arg, Immediate(right)); |
| 359 | SetArgsReversed(); |
| 360 | } else { |
| 361 | // For non-commutative operations, left and right_arg might be |
| 362 | // the same register. Therefore, the order of the moves is |
| 363 | // important here in order to not overwrite left before moving |
| 364 | // it to left_arg. |
| 365 | __ mov(left_arg, left); |
| 366 | __ mov(right_arg, Immediate(right)); |
| 367 | } |
| 368 | |
| 369 | // Update flags to indicate that arguments are in registers. |
| 370 | SetArgsInRegisters(); |
| 371 | __ IncrementCounter(&Counters::generic_binary_stub_calls_regs, 1); |
| 372 | } |
| 373 | |
| 374 | // Call the stub. |
| 375 | __ CallStub(this); |
| 376 | } |
| 377 | |
| 378 | |
| 379 | void GenericBinaryOpStub::GenerateCall( |
| 380 | MacroAssembler* masm, |
| 381 | Smi* left, |
| 382 | Register right) { |
| 383 | if (!ArgsInRegistersSupported()) { |
| 384 | // Pass arguments on the stack. |
| 385 | __ push(Immediate(left)); |
| 386 | __ push(right); |
| 387 | } else { |
| 388 | // The calling convention with registers is left in edx and right in eax. |
| 389 | Register left_arg = edx; |
| 390 | Register right_arg = eax; |
| 391 | if (right.is(right_arg)) { |
| 392 | __ mov(left_arg, Immediate(left)); |
| 393 | } else if (right.is(left_arg) && IsOperationCommutative()) { |
| 394 | __ mov(right_arg, Immediate(left)); |
| 395 | SetArgsReversed(); |
| 396 | } else { |
| 397 | // For non-commutative operations, right and left_arg might be |
| 398 | // the same register. Therefore, the order of the moves is |
| 399 | // important here in order to not overwrite right before moving |
| 400 | // it to right_arg. |
| 401 | __ mov(right_arg, right); |
| 402 | __ mov(left_arg, Immediate(left)); |
| 403 | } |
| 404 | // Update flags to indicate that arguments are in registers. |
| 405 | SetArgsInRegisters(); |
| 406 | __ IncrementCounter(&Counters::generic_binary_stub_calls_regs, 1); |
| 407 | } |
| 408 | |
| 409 | // Call the stub. |
| 410 | __ CallStub(this); |
| 411 | } |
| 412 | |
| 413 | |
| 414 | class FloatingPointHelper : public AllStatic { |
| 415 | public: |
| 416 | |
| 417 | enum ArgLocation { |
| 418 | ARGS_ON_STACK, |
| 419 | ARGS_IN_REGISTERS |
| 420 | }; |
| 421 | |
| 422 | // Code pattern for loading a floating point value. Input value must |
| 423 | // be either a smi or a heap number object (fp value). Requirements: |
| 424 | // operand in register number. Returns operand as floating point number |
| 425 | // on FPU stack. |
| 426 | static void LoadFloatOperand(MacroAssembler* masm, Register number); |
| 427 | |
| 428 | // Code pattern for loading floating point values. Input values must |
| 429 | // be either smi or heap number objects (fp values). Requirements: |
| 430 | // operand_1 on TOS+1 or in edx, operand_2 on TOS+2 or in eax. |
| 431 | // Returns operands as floating point numbers on FPU stack. |
| 432 | static void LoadFloatOperands(MacroAssembler* masm, |
| 433 | Register scratch, |
| 434 | ArgLocation arg_location = ARGS_ON_STACK); |
| 435 | |
| 436 | // Similar to LoadFloatOperand but assumes that both operands are smis. |
| 437 | // Expects operands in edx, eax. |
| 438 | static void LoadFloatSmis(MacroAssembler* masm, Register scratch); |
| 439 | |
| 440 | // Test if operands are smi or number objects (fp). Requirements: |
| 441 | // operand_1 in eax, operand_2 in edx; falls through on float |
| 442 | // operands, jumps to the non_float label otherwise. |
| 443 | static void CheckFloatOperands(MacroAssembler* masm, |
| 444 | Label* non_float, |
| 445 | Register scratch); |
| 446 | |
| 447 | // Takes the operands in edx and eax and loads them as integers in eax |
| 448 | // and ecx. |
| 449 | static void LoadAsIntegers(MacroAssembler* masm, |
| 450 | TypeInfo type_info, |
| 451 | bool use_sse3, |
| 452 | Label* operand_conversion_failure); |
| 453 | static void LoadNumbersAsIntegers(MacroAssembler* masm, |
| 454 | TypeInfo type_info, |
| 455 | bool use_sse3, |
| 456 | Label* operand_conversion_failure); |
| 457 | static void LoadUnknownsAsIntegers(MacroAssembler* masm, |
| 458 | bool use_sse3, |
| 459 | Label* operand_conversion_failure); |
| 460 | |
| 461 | // Test if operands are smis or heap numbers and load them |
| 462 | // into xmm0 and xmm1 if they are. Operands are in edx and eax. |
| 463 | // Leaves operands unchanged. |
| 464 | static void LoadSSE2Operands(MacroAssembler* masm); |
| 465 | |
| 466 | // Test if operands are numbers (smi or HeapNumber objects), and load |
| 467 | // them into xmm0 and xmm1 if they are. Jump to label not_numbers if |
| 468 | // either operand is not a number. Operands are in edx and eax. |
| 469 | // Leaves operands unchanged. |
| 470 | static void LoadSSE2Operands(MacroAssembler* masm, Label* not_numbers); |
| 471 | |
| 472 | // Similar to LoadSSE2Operands but assumes that both operands are smis. |
| 473 | // Expects operands in edx, eax. |
| 474 | static void LoadSSE2Smis(MacroAssembler* masm, Register scratch); |
| 475 | }; |
| 476 | |
| 477 | |
| 478 | void GenericBinaryOpStub::GenerateSmiCode(MacroAssembler* masm, Label* slow) { |
| 479 | // 1. Move arguments into edx, eax except for DIV and MOD, which need the |
| 480 | // dividend in eax and edx free for the division. Use eax, ebx for those. |
| 481 | Comment load_comment(masm, "-- Load arguments"); |
| 482 | Register left = edx; |
| 483 | Register right = eax; |
| 484 | if (op_ == Token::DIV || op_ == Token::MOD) { |
| 485 | left = eax; |
| 486 | right = ebx; |
| 487 | if (HasArgsInRegisters()) { |
| 488 | __ mov(ebx, eax); |
| 489 | __ mov(eax, edx); |
| 490 | } |
| 491 | } |
| 492 | if (!HasArgsInRegisters()) { |
| 493 | __ mov(right, Operand(esp, 1 * kPointerSize)); |
| 494 | __ mov(left, Operand(esp, 2 * kPointerSize)); |
| 495 | } |
| 496 | |
| 497 | if (static_operands_type_.IsSmi()) { |
| 498 | if (FLAG_debug_code) { |
| 499 | __ AbortIfNotSmi(left); |
| 500 | __ AbortIfNotSmi(right); |
| 501 | } |
| 502 | if (op_ == Token::BIT_OR) { |
| 503 | __ or_(right, Operand(left)); |
| 504 | GenerateReturn(masm); |
| 505 | return; |
| 506 | } else if (op_ == Token::BIT_AND) { |
| 507 | __ and_(right, Operand(left)); |
| 508 | GenerateReturn(masm); |
| 509 | return; |
| 510 | } else if (op_ == Token::BIT_XOR) { |
| 511 | __ xor_(right, Operand(left)); |
| 512 | GenerateReturn(masm); |
| 513 | return; |
| 514 | } |
| 515 | } |
| 516 | |
| 517 | // 2. Prepare the smi check of both operands by oring them together. |
| 518 | Comment smi_check_comment(masm, "-- Smi check arguments"); |
| 519 | Label not_smis; |
| 520 | Register combined = ecx; |
| 521 | ASSERT(!left.is(combined) && !right.is(combined)); |
| 522 | switch (op_) { |
| 523 | case Token::BIT_OR: |
| 524 | // Perform the operation into eax and smi check the result. Preserve |
| 525 | // eax in case the result is not a smi. |
| 526 | ASSERT(!left.is(ecx) && !right.is(ecx)); |
| 527 | __ mov(ecx, right); |
| 528 | __ or_(right, Operand(left)); // Bitwise or is commutative. |
| 529 | combined = right; |
| 530 | break; |
| 531 | |
| 532 | case Token::BIT_XOR: |
| 533 | case Token::BIT_AND: |
| 534 | case Token::ADD: |
| 535 | case Token::SUB: |
| 536 | case Token::MUL: |
| 537 | case Token::DIV: |
| 538 | case Token::MOD: |
| 539 | __ mov(combined, right); |
| 540 | __ or_(combined, Operand(left)); |
| 541 | break; |
| 542 | |
| 543 | case Token::SHL: |
| 544 | case Token::SAR: |
| 545 | case Token::SHR: |
| 546 | // Move the right operand into ecx for the shift operation, use eax |
| 547 | // for the smi check register. |
| 548 | ASSERT(!left.is(ecx) && !right.is(ecx)); |
| 549 | __ mov(ecx, right); |
| 550 | __ or_(right, Operand(left)); |
| 551 | combined = right; |
| 552 | break; |
| 553 | |
| 554 | default: |
| 555 | break; |
| 556 | } |
| 557 | |
| 558 | // 3. Perform the smi check of the operands. |
| 559 | STATIC_ASSERT(kSmiTag == 0); // Adjust zero check if not the case. |
| 560 | __ test(combined, Immediate(kSmiTagMask)); |
| 561 | __ j(not_zero, ¬_smis, not_taken); |
| 562 | |
| 563 | // 4. Operands are both smis, perform the operation leaving the result in |
| 564 | // eax and check the result if necessary. |
| 565 | Comment perform_smi(masm, "-- Perform smi operation"); |
| 566 | Label use_fp_on_smis; |
| 567 | switch (op_) { |
| 568 | case Token::BIT_OR: |
| 569 | // Nothing to do. |
| 570 | break; |
| 571 | |
| 572 | case Token::BIT_XOR: |
| 573 | ASSERT(right.is(eax)); |
| 574 | __ xor_(right, Operand(left)); // Bitwise xor is commutative. |
| 575 | break; |
| 576 | |
| 577 | case Token::BIT_AND: |
| 578 | ASSERT(right.is(eax)); |
| 579 | __ and_(right, Operand(left)); // Bitwise and is commutative. |
| 580 | break; |
| 581 | |
| 582 | case Token::SHL: |
| 583 | // Remove tags from operands (but keep sign). |
| 584 | __ SmiUntag(left); |
| 585 | __ SmiUntag(ecx); |
| 586 | // Perform the operation. |
| 587 | __ shl_cl(left); |
| 588 | // Check that the *signed* result fits in a smi. |
| 589 | __ cmp(left, 0xc0000000); |
| 590 | __ j(sign, &use_fp_on_smis, not_taken); |
| 591 | // Tag the result and store it in register eax. |
| 592 | __ SmiTag(left); |
| 593 | __ mov(eax, left); |
| 594 | break; |
| 595 | |
| 596 | case Token::SAR: |
| 597 | // Remove tags from operands (but keep sign). |
| 598 | __ SmiUntag(left); |
| 599 | __ SmiUntag(ecx); |
| 600 | // Perform the operation. |
| 601 | __ sar_cl(left); |
| 602 | // Tag the result and store it in register eax. |
| 603 | __ SmiTag(left); |
| 604 | __ mov(eax, left); |
| 605 | break; |
| 606 | |
| 607 | case Token::SHR: |
| 608 | // Remove tags from operands (but keep sign). |
| 609 | __ SmiUntag(left); |
| 610 | __ SmiUntag(ecx); |
| 611 | // Perform the operation. |
| 612 | __ shr_cl(left); |
| 613 | // Check that the *unsigned* result fits in a smi. |
| 614 | // Neither of the two high-order bits can be set: |
| 615 | // - 0x80000000: high bit would be lost when smi tagging. |
| 616 | // - 0x40000000: this number would convert to negative when |
| 617 | // Smi tagging these two cases can only happen with shifts |
| 618 | // by 0 or 1 when handed a valid smi. |
| 619 | __ test(left, Immediate(0xc0000000)); |
| 620 | __ j(not_zero, slow, not_taken); |
| 621 | // Tag the result and store it in register eax. |
| 622 | __ SmiTag(left); |
| 623 | __ mov(eax, left); |
| 624 | break; |
| 625 | |
| 626 | case Token::ADD: |
| 627 | ASSERT(right.is(eax)); |
| 628 | __ add(right, Operand(left)); // Addition is commutative. |
| 629 | __ j(overflow, &use_fp_on_smis, not_taken); |
| 630 | break; |
| 631 | |
| 632 | case Token::SUB: |
| 633 | __ sub(left, Operand(right)); |
| 634 | __ j(overflow, &use_fp_on_smis, not_taken); |
| 635 | __ mov(eax, left); |
| 636 | break; |
| 637 | |
| 638 | case Token::MUL: |
| 639 | // If the smi tag is 0 we can just leave the tag on one operand. |
| 640 | STATIC_ASSERT(kSmiTag == 0); // Adjust code below if not the case. |
| 641 | // We can't revert the multiplication if the result is not a smi |
| 642 | // so save the right operand. |
| 643 | __ mov(ebx, right); |
| 644 | // Remove tag from one of the operands (but keep sign). |
| 645 | __ SmiUntag(right); |
| 646 | // Do multiplication. |
| 647 | __ imul(right, Operand(left)); // Multiplication is commutative. |
| 648 | __ j(overflow, &use_fp_on_smis, not_taken); |
| 649 | // Check for negative zero result. Use combined = left | right. |
| 650 | __ NegativeZeroTest(right, combined, &use_fp_on_smis); |
| 651 | break; |
| 652 | |
| 653 | case Token::DIV: |
| 654 | // We can't revert the division if the result is not a smi so |
| 655 | // save the left operand. |
| 656 | __ mov(edi, left); |
| 657 | // Check for 0 divisor. |
| 658 | __ test(right, Operand(right)); |
| 659 | __ j(zero, &use_fp_on_smis, not_taken); |
| 660 | // Sign extend left into edx:eax. |
| 661 | ASSERT(left.is(eax)); |
| 662 | __ cdq(); |
| 663 | // Divide edx:eax by right. |
| 664 | __ idiv(right); |
| 665 | // Check for the corner case of dividing the most negative smi by |
| 666 | // -1. We cannot use the overflow flag, since it is not set by idiv |
| 667 | // instruction. |
| 668 | STATIC_ASSERT(kSmiTag == 0 && kSmiTagSize == 1); |
| 669 | __ cmp(eax, 0x40000000); |
| 670 | __ j(equal, &use_fp_on_smis); |
| 671 | // Check for negative zero result. Use combined = left | right. |
| 672 | __ NegativeZeroTest(eax, combined, &use_fp_on_smis); |
| 673 | // Check that the remainder is zero. |
| 674 | __ test(edx, Operand(edx)); |
| 675 | __ j(not_zero, &use_fp_on_smis); |
| 676 | // Tag the result and store it in register eax. |
| 677 | __ SmiTag(eax); |
| 678 | break; |
| 679 | |
| 680 | case Token::MOD: |
| 681 | // Check for 0 divisor. |
| 682 | __ test(right, Operand(right)); |
| 683 | __ j(zero, ¬_smis, not_taken); |
| 684 | |
| 685 | // Sign extend left into edx:eax. |
| 686 | ASSERT(left.is(eax)); |
| 687 | __ cdq(); |
| 688 | // Divide edx:eax by right. |
| 689 | __ idiv(right); |
| 690 | // Check for negative zero result. Use combined = left | right. |
| 691 | __ NegativeZeroTest(edx, combined, slow); |
| 692 | // Move remainder to register eax. |
| 693 | __ mov(eax, edx); |
| 694 | break; |
| 695 | |
| 696 | default: |
| 697 | UNREACHABLE(); |
| 698 | } |
| 699 | |
| 700 | // 5. Emit return of result in eax. |
| 701 | GenerateReturn(masm); |
| 702 | |
| 703 | // 6. For some operations emit inline code to perform floating point |
| 704 | // operations on known smis (e.g., if the result of the operation |
| 705 | // overflowed the smi range). |
| 706 | switch (op_) { |
| 707 | case Token::SHL: { |
| 708 | Comment perform_float(masm, "-- Perform float operation on smis"); |
| 709 | __ bind(&use_fp_on_smis); |
| 710 | // Result we want is in left == edx, so we can put the allocated heap |
| 711 | // number in eax. |
| 712 | __ AllocateHeapNumber(eax, ecx, ebx, slow); |
| 713 | // Store the result in the HeapNumber and return. |
| 714 | if (CpuFeatures::IsSupported(SSE2)) { |
| 715 | CpuFeatures::Scope use_sse2(SSE2); |
| 716 | __ cvtsi2sd(xmm0, Operand(left)); |
| 717 | __ movdbl(FieldOperand(eax, HeapNumber::kValueOffset), xmm0); |
| 718 | } else { |
| 719 | // It's OK to overwrite the right argument on the stack because we |
| 720 | // are about to return. |
| 721 | __ mov(Operand(esp, 1 * kPointerSize), left); |
| 722 | __ fild_s(Operand(esp, 1 * kPointerSize)); |
| 723 | __ fstp_d(FieldOperand(eax, HeapNumber::kValueOffset)); |
| 724 | } |
| 725 | GenerateReturn(masm); |
| 726 | break; |
| 727 | } |
| 728 | |
| 729 | case Token::ADD: |
| 730 | case Token::SUB: |
| 731 | case Token::MUL: |
| 732 | case Token::DIV: { |
| 733 | Comment perform_float(masm, "-- Perform float operation on smis"); |
| 734 | __ bind(&use_fp_on_smis); |
| 735 | // Restore arguments to edx, eax. |
| 736 | switch (op_) { |
| 737 | case Token::ADD: |
| 738 | // Revert right = right + left. |
| 739 | __ sub(right, Operand(left)); |
| 740 | break; |
| 741 | case Token::SUB: |
| 742 | // Revert left = left - right. |
| 743 | __ add(left, Operand(right)); |
| 744 | break; |
| 745 | case Token::MUL: |
| 746 | // Right was clobbered but a copy is in ebx. |
| 747 | __ mov(right, ebx); |
| 748 | break; |
| 749 | case Token::DIV: |
| 750 | // Left was clobbered but a copy is in edi. Right is in ebx for |
| 751 | // division. |
| 752 | __ mov(edx, edi); |
| 753 | __ mov(eax, right); |
| 754 | break; |
| 755 | default: UNREACHABLE(); |
| 756 | break; |
| 757 | } |
| 758 | __ AllocateHeapNumber(ecx, ebx, no_reg, slow); |
| 759 | if (CpuFeatures::IsSupported(SSE2)) { |
| 760 | CpuFeatures::Scope use_sse2(SSE2); |
| 761 | FloatingPointHelper::LoadSSE2Smis(masm, ebx); |
| 762 | switch (op_) { |
| 763 | case Token::ADD: __ addsd(xmm0, xmm1); break; |
| 764 | case Token::SUB: __ subsd(xmm0, xmm1); break; |
| 765 | case Token::MUL: __ mulsd(xmm0, xmm1); break; |
| 766 | case Token::DIV: __ divsd(xmm0, xmm1); break; |
| 767 | default: UNREACHABLE(); |
| 768 | } |
| 769 | __ movdbl(FieldOperand(ecx, HeapNumber::kValueOffset), xmm0); |
| 770 | } else { // SSE2 not available, use FPU. |
| 771 | FloatingPointHelper::LoadFloatSmis(masm, ebx); |
| 772 | switch (op_) { |
| 773 | case Token::ADD: __ faddp(1); break; |
| 774 | case Token::SUB: __ fsubp(1); break; |
| 775 | case Token::MUL: __ fmulp(1); break; |
| 776 | case Token::DIV: __ fdivp(1); break; |
| 777 | default: UNREACHABLE(); |
| 778 | } |
| 779 | __ fstp_d(FieldOperand(ecx, HeapNumber::kValueOffset)); |
| 780 | } |
| 781 | __ mov(eax, ecx); |
| 782 | GenerateReturn(masm); |
| 783 | break; |
| 784 | } |
| 785 | |
| 786 | default: |
| 787 | break; |
| 788 | } |
| 789 | |
| 790 | // 7. Non-smi operands, fall out to the non-smi code with the operands in |
| 791 | // edx and eax. |
| 792 | Comment done_comment(masm, "-- Enter non-smi code"); |
| 793 | __ bind(¬_smis); |
| 794 | switch (op_) { |
| 795 | case Token::BIT_OR: |
| 796 | case Token::SHL: |
| 797 | case Token::SAR: |
| 798 | case Token::SHR: |
| 799 | // Right operand is saved in ecx and eax was destroyed by the smi |
| 800 | // check. |
| 801 | __ mov(eax, ecx); |
| 802 | break; |
| 803 | |
| 804 | case Token::DIV: |
| 805 | case Token::MOD: |
| 806 | // Operands are in eax, ebx at this point. |
| 807 | __ mov(edx, eax); |
| 808 | __ mov(eax, ebx); |
| 809 | break; |
| 810 | |
| 811 | default: |
| 812 | break; |
| 813 | } |
| 814 | } |
| 815 | |
| 816 | |
| 817 | void GenericBinaryOpStub::Generate(MacroAssembler* masm) { |
| 818 | Label call_runtime; |
| 819 | |
| 820 | __ IncrementCounter(&Counters::generic_binary_stub_calls, 1); |
| 821 | |
| 822 | // Generate fast case smi code if requested. This flag is set when the fast |
| 823 | // case smi code is not generated by the caller. Generating it here will speed |
| 824 | // up common operations. |
| 825 | if (ShouldGenerateSmiCode()) { |
| 826 | GenerateSmiCode(masm, &call_runtime); |
| 827 | } else if (op_ != Token::MOD) { // MOD goes straight to runtime. |
| 828 | if (!HasArgsInRegisters()) { |
| 829 | GenerateLoadArguments(masm); |
| 830 | } |
| 831 | } |
| 832 | |
| 833 | // Floating point case. |
| 834 | if (ShouldGenerateFPCode()) { |
| 835 | switch (op_) { |
| 836 | case Token::ADD: |
| 837 | case Token::SUB: |
| 838 | case Token::MUL: |
| 839 | case Token::DIV: { |
| 840 | if (runtime_operands_type_ == BinaryOpIC::DEFAULT && |
| 841 | HasSmiCodeInStub()) { |
| 842 | // Execution reaches this point when the first non-smi argument occurs |
| 843 | // (and only if smi code is generated). This is the right moment to |
| 844 | // patch to HEAP_NUMBERS state. The transition is attempted only for |
| 845 | // the four basic operations. The stub stays in the DEFAULT state |
| 846 | // forever for all other operations (also if smi code is skipped). |
| 847 | GenerateTypeTransition(masm); |
| 848 | break; |
| 849 | } |
| 850 | |
| 851 | Label not_floats; |
| 852 | if (CpuFeatures::IsSupported(SSE2)) { |
| 853 | CpuFeatures::Scope use_sse2(SSE2); |
| 854 | if (static_operands_type_.IsNumber()) { |
| 855 | if (FLAG_debug_code) { |
| 856 | // Assert at runtime that inputs are only numbers. |
| 857 | __ AbortIfNotNumber(edx); |
| 858 | __ AbortIfNotNumber(eax); |
| 859 | } |
| 860 | if (static_operands_type_.IsSmi()) { |
| 861 | if (FLAG_debug_code) { |
| 862 | __ AbortIfNotSmi(edx); |
| 863 | __ AbortIfNotSmi(eax); |
| 864 | } |
| 865 | FloatingPointHelper::LoadSSE2Smis(masm, ecx); |
| 866 | } else { |
| 867 | FloatingPointHelper::LoadSSE2Operands(masm); |
| 868 | } |
| 869 | } else { |
| 870 | FloatingPointHelper::LoadSSE2Operands(masm, &call_runtime); |
| 871 | } |
| 872 | |
| 873 | switch (op_) { |
| 874 | case Token::ADD: __ addsd(xmm0, xmm1); break; |
| 875 | case Token::SUB: __ subsd(xmm0, xmm1); break; |
| 876 | case Token::MUL: __ mulsd(xmm0, xmm1); break; |
| 877 | case Token::DIV: __ divsd(xmm0, xmm1); break; |
| 878 | default: UNREACHABLE(); |
| 879 | } |
| 880 | GenerateHeapResultAllocation(masm, &call_runtime); |
| 881 | __ movdbl(FieldOperand(eax, HeapNumber::kValueOffset), xmm0); |
| 882 | GenerateReturn(masm); |
| 883 | } else { // SSE2 not available, use FPU. |
| 884 | if (static_operands_type_.IsNumber()) { |
| 885 | if (FLAG_debug_code) { |
| 886 | // Assert at runtime that inputs are only numbers. |
| 887 | __ AbortIfNotNumber(edx); |
| 888 | __ AbortIfNotNumber(eax); |
| 889 | } |
| 890 | } else { |
| 891 | FloatingPointHelper::CheckFloatOperands(masm, &call_runtime, ebx); |
| 892 | } |
| 893 | FloatingPointHelper::LoadFloatOperands( |
| 894 | masm, |
| 895 | ecx, |
| 896 | FloatingPointHelper::ARGS_IN_REGISTERS); |
| 897 | switch (op_) { |
| 898 | case Token::ADD: __ faddp(1); break; |
| 899 | case Token::SUB: __ fsubp(1); break; |
| 900 | case Token::MUL: __ fmulp(1); break; |
| 901 | case Token::DIV: __ fdivp(1); break; |
| 902 | default: UNREACHABLE(); |
| 903 | } |
| 904 | Label after_alloc_failure; |
| 905 | GenerateHeapResultAllocation(masm, &after_alloc_failure); |
| 906 | __ fstp_d(FieldOperand(eax, HeapNumber::kValueOffset)); |
| 907 | GenerateReturn(masm); |
| 908 | __ bind(&after_alloc_failure); |
| 909 | __ ffree(); |
| 910 | __ jmp(&call_runtime); |
| 911 | } |
| 912 | __ bind(¬_floats); |
| 913 | if (runtime_operands_type_ == BinaryOpIC::DEFAULT && |
| 914 | !HasSmiCodeInStub()) { |
| 915 | // Execution reaches this point when the first non-number argument |
| 916 | // occurs (and only if smi code is skipped from the stub, otherwise |
| 917 | // the patching has already been done earlier in this case branch). |
| 918 | // Try patching to STRINGS for ADD operation. |
| 919 | if (op_ == Token::ADD) { |
| 920 | GenerateTypeTransition(masm); |
| 921 | } |
| 922 | } |
| 923 | break; |
| 924 | } |
| 925 | case Token::MOD: { |
| 926 | // For MOD we go directly to runtime in the non-smi case. |
| 927 | break; |
| 928 | } |
| 929 | case Token::BIT_OR: |
| 930 | case Token::BIT_AND: |
| 931 | case Token::BIT_XOR: |
| 932 | case Token::SAR: |
| 933 | case Token::SHL: |
| 934 | case Token::SHR: { |
| 935 | Label non_smi_result; |
| 936 | FloatingPointHelper::LoadAsIntegers(masm, |
| 937 | static_operands_type_, |
| 938 | use_sse3_, |
| 939 | &call_runtime); |
| 940 | switch (op_) { |
| 941 | case Token::BIT_OR: __ or_(eax, Operand(ecx)); break; |
| 942 | case Token::BIT_AND: __ and_(eax, Operand(ecx)); break; |
| 943 | case Token::BIT_XOR: __ xor_(eax, Operand(ecx)); break; |
| 944 | case Token::SAR: __ sar_cl(eax); break; |
| 945 | case Token::SHL: __ shl_cl(eax); break; |
| 946 | case Token::SHR: __ shr_cl(eax); break; |
| 947 | default: UNREACHABLE(); |
| 948 | } |
| 949 | if (op_ == Token::SHR) { |
| 950 | // Check if result is non-negative and fits in a smi. |
| 951 | __ test(eax, Immediate(0xc0000000)); |
| 952 | __ j(not_zero, &call_runtime); |
| 953 | } else { |
| 954 | // Check if result fits in a smi. |
| 955 | __ cmp(eax, 0xc0000000); |
| 956 | __ j(negative, &non_smi_result); |
| 957 | } |
| 958 | // Tag smi result and return. |
| 959 | __ SmiTag(eax); |
| 960 | GenerateReturn(masm); |
| 961 | |
| 962 | // All ops except SHR return a signed int32 that we load in |
| 963 | // a HeapNumber. |
| 964 | if (op_ != Token::SHR) { |
| 965 | __ bind(&non_smi_result); |
| 966 | // Allocate a heap number if needed. |
| 967 | __ mov(ebx, Operand(eax)); // ebx: result |
| 968 | Label skip_allocation; |
| 969 | switch (mode_) { |
| 970 | case OVERWRITE_LEFT: |
| 971 | case OVERWRITE_RIGHT: |
| 972 | // If the operand was an object, we skip the |
| 973 | // allocation of a heap number. |
| 974 | __ mov(eax, Operand(esp, mode_ == OVERWRITE_RIGHT ? |
| 975 | 1 * kPointerSize : 2 * kPointerSize)); |
| 976 | __ test(eax, Immediate(kSmiTagMask)); |
| 977 | __ j(not_zero, &skip_allocation, not_taken); |
| 978 | // Fall through! |
| 979 | case NO_OVERWRITE: |
| 980 | __ AllocateHeapNumber(eax, ecx, edx, &call_runtime); |
| 981 | __ bind(&skip_allocation); |
| 982 | break; |
| 983 | default: UNREACHABLE(); |
| 984 | } |
| 985 | // Store the result in the HeapNumber and return. |
| 986 | if (CpuFeatures::IsSupported(SSE2)) { |
| 987 | CpuFeatures::Scope use_sse2(SSE2); |
| 988 | __ cvtsi2sd(xmm0, Operand(ebx)); |
| 989 | __ movdbl(FieldOperand(eax, HeapNumber::kValueOffset), xmm0); |
| 990 | } else { |
| 991 | __ mov(Operand(esp, 1 * kPointerSize), ebx); |
| 992 | __ fild_s(Operand(esp, 1 * kPointerSize)); |
| 993 | __ fstp_d(FieldOperand(eax, HeapNumber::kValueOffset)); |
| 994 | } |
| 995 | GenerateReturn(masm); |
| 996 | } |
| 997 | break; |
| 998 | } |
| 999 | default: UNREACHABLE(); break; |
| 1000 | } |
| 1001 | } |
| 1002 | |
| 1003 | // If all else fails, use the runtime system to get the correct |
| 1004 | // result. If arguments was passed in registers now place them on the |
| 1005 | // stack in the correct order below the return address. |
| 1006 | __ bind(&call_runtime); |
| 1007 | if (HasArgsInRegisters()) { |
| 1008 | GenerateRegisterArgsPush(masm); |
| 1009 | } |
| 1010 | |
| 1011 | switch (op_) { |
| 1012 | case Token::ADD: { |
| 1013 | // Test for string arguments before calling runtime. |
| 1014 | Label not_strings, not_string1, string1, string1_smi2; |
| 1015 | |
| 1016 | // If this stub has already generated FP-specific code then the arguments |
| 1017 | // are already in edx, eax |
| 1018 | if (!ShouldGenerateFPCode() && !HasArgsInRegisters()) { |
| 1019 | GenerateLoadArguments(masm); |
| 1020 | } |
| 1021 | |
| 1022 | // Registers containing left and right operands respectively. |
| 1023 | Register lhs, rhs; |
| 1024 | if (HasArgsReversed()) { |
| 1025 | lhs = eax; |
| 1026 | rhs = edx; |
| 1027 | } else { |
| 1028 | lhs = edx; |
| 1029 | rhs = eax; |
| 1030 | } |
| 1031 | |
| 1032 | // Test if first argument is a string. |
| 1033 | __ test(lhs, Immediate(kSmiTagMask)); |
| 1034 | __ j(zero, ¬_string1); |
| 1035 | __ CmpObjectType(lhs, FIRST_NONSTRING_TYPE, ecx); |
| 1036 | __ j(above_equal, ¬_string1); |
| 1037 | |
| 1038 | // First argument is a string, test second. |
| 1039 | __ test(rhs, Immediate(kSmiTagMask)); |
| 1040 | __ j(zero, &string1_smi2); |
| 1041 | __ CmpObjectType(rhs, FIRST_NONSTRING_TYPE, ecx); |
| 1042 | __ j(above_equal, &string1); |
| 1043 | |
| 1044 | // First and second argument are strings. Jump to the string add stub. |
| 1045 | StringAddStub string_add_stub(NO_STRING_CHECK_IN_STUB); |
| 1046 | __ TailCallStub(&string_add_stub); |
| 1047 | |
| 1048 | __ bind(&string1_smi2); |
| 1049 | // First argument is a string, second is a smi. Try to lookup the number |
| 1050 | // string for the smi in the number string cache. |
| 1051 | NumberToStringStub::GenerateLookupNumberStringCache( |
| 1052 | masm, rhs, edi, ebx, ecx, true, &string1); |
| 1053 | |
| 1054 | // Replace second argument on stack and tailcall string add stub to make |
| 1055 | // the result. |
| 1056 | __ mov(Operand(esp, 1 * kPointerSize), edi); |
| 1057 | __ TailCallStub(&string_add_stub); |
| 1058 | |
| 1059 | // Only first argument is a string. |
| 1060 | __ bind(&string1); |
| 1061 | __ InvokeBuiltin(Builtins::STRING_ADD_LEFT, JUMP_FUNCTION); |
| 1062 | |
| 1063 | // First argument was not a string, test second. |
| 1064 | __ bind(¬_string1); |
| 1065 | __ test(rhs, Immediate(kSmiTagMask)); |
| 1066 | __ j(zero, ¬_strings); |
| 1067 | __ CmpObjectType(rhs, FIRST_NONSTRING_TYPE, ecx); |
| 1068 | __ j(above_equal, ¬_strings); |
| 1069 | |
| 1070 | // Only second argument is a string. |
| 1071 | __ InvokeBuiltin(Builtins::STRING_ADD_RIGHT, JUMP_FUNCTION); |
| 1072 | |
| 1073 | __ bind(¬_strings); |
| 1074 | // Neither argument is a string. |
| 1075 | __ InvokeBuiltin(Builtins::ADD, JUMP_FUNCTION); |
| 1076 | break; |
| 1077 | } |
| 1078 | case Token::SUB: |
| 1079 | __ InvokeBuiltin(Builtins::SUB, JUMP_FUNCTION); |
| 1080 | break; |
| 1081 | case Token::MUL: |
| 1082 | __ InvokeBuiltin(Builtins::MUL, JUMP_FUNCTION); |
| 1083 | break; |
| 1084 | case Token::DIV: |
| 1085 | __ InvokeBuiltin(Builtins::DIV, JUMP_FUNCTION); |
| 1086 | break; |
| 1087 | case Token::MOD: |
| 1088 | __ InvokeBuiltin(Builtins::MOD, JUMP_FUNCTION); |
| 1089 | break; |
| 1090 | case Token::BIT_OR: |
| 1091 | __ InvokeBuiltin(Builtins::BIT_OR, JUMP_FUNCTION); |
| 1092 | break; |
| 1093 | case Token::BIT_AND: |
| 1094 | __ InvokeBuiltin(Builtins::BIT_AND, JUMP_FUNCTION); |
| 1095 | break; |
| 1096 | case Token::BIT_XOR: |
| 1097 | __ InvokeBuiltin(Builtins::BIT_XOR, JUMP_FUNCTION); |
| 1098 | break; |
| 1099 | case Token::SAR: |
| 1100 | __ InvokeBuiltin(Builtins::SAR, JUMP_FUNCTION); |
| 1101 | break; |
| 1102 | case Token::SHL: |
| 1103 | __ InvokeBuiltin(Builtins::SHL, JUMP_FUNCTION); |
| 1104 | break; |
| 1105 | case Token::SHR: |
| 1106 | __ InvokeBuiltin(Builtins::SHR, JUMP_FUNCTION); |
| 1107 | break; |
| 1108 | default: |
| 1109 | UNREACHABLE(); |
| 1110 | } |
| 1111 | } |
| 1112 | |
| 1113 | |
| 1114 | void GenericBinaryOpStub::GenerateHeapResultAllocation(MacroAssembler* masm, |
| 1115 | Label* alloc_failure) { |
| 1116 | Label skip_allocation; |
| 1117 | OverwriteMode mode = mode_; |
| 1118 | if (HasArgsReversed()) { |
| 1119 | if (mode == OVERWRITE_RIGHT) { |
| 1120 | mode = OVERWRITE_LEFT; |
| 1121 | } else if (mode == OVERWRITE_LEFT) { |
| 1122 | mode = OVERWRITE_RIGHT; |
| 1123 | } |
| 1124 | } |
| 1125 | switch (mode) { |
| 1126 | case OVERWRITE_LEFT: { |
| 1127 | // If the argument in edx is already an object, we skip the |
| 1128 | // allocation of a heap number. |
| 1129 | __ test(edx, Immediate(kSmiTagMask)); |
| 1130 | __ j(not_zero, &skip_allocation, not_taken); |
| 1131 | // Allocate a heap number for the result. Keep eax and edx intact |
| 1132 | // for the possible runtime call. |
| 1133 | __ AllocateHeapNumber(ebx, ecx, no_reg, alloc_failure); |
| 1134 | // Now edx can be overwritten losing one of the arguments as we are |
| 1135 | // now done and will not need it any more. |
| 1136 | __ mov(edx, Operand(ebx)); |
| 1137 | __ bind(&skip_allocation); |
| 1138 | // Use object in edx as a result holder |
| 1139 | __ mov(eax, Operand(edx)); |
| 1140 | break; |
| 1141 | } |
| 1142 | case OVERWRITE_RIGHT: |
| 1143 | // If the argument in eax is already an object, we skip the |
| 1144 | // allocation of a heap number. |
| 1145 | __ test(eax, Immediate(kSmiTagMask)); |
| 1146 | __ j(not_zero, &skip_allocation, not_taken); |
| 1147 | // Fall through! |
| 1148 | case NO_OVERWRITE: |
| 1149 | // Allocate a heap number for the result. Keep eax and edx intact |
| 1150 | // for the possible runtime call. |
| 1151 | __ AllocateHeapNumber(ebx, ecx, no_reg, alloc_failure); |
| 1152 | // Now eax can be overwritten losing one of the arguments as we are |
| 1153 | // now done and will not need it any more. |
| 1154 | __ mov(eax, ebx); |
| 1155 | __ bind(&skip_allocation); |
| 1156 | break; |
| 1157 | default: UNREACHABLE(); |
| 1158 | } |
| 1159 | } |
| 1160 | |
| 1161 | |
| 1162 | void GenericBinaryOpStub::GenerateLoadArguments(MacroAssembler* masm) { |
| 1163 | // If arguments are not passed in registers read them from the stack. |
| 1164 | ASSERT(!HasArgsInRegisters()); |
| 1165 | __ mov(eax, Operand(esp, 1 * kPointerSize)); |
| 1166 | __ mov(edx, Operand(esp, 2 * kPointerSize)); |
| 1167 | } |
| 1168 | |
| 1169 | |
| 1170 | void GenericBinaryOpStub::GenerateReturn(MacroAssembler* masm) { |
| 1171 | // If arguments are not passed in registers remove them from the stack before |
| 1172 | // returning. |
| 1173 | if (!HasArgsInRegisters()) { |
| 1174 | __ ret(2 * kPointerSize); // Remove both operands |
| 1175 | } else { |
| 1176 | __ ret(0); |
| 1177 | } |
| 1178 | } |
| 1179 | |
| 1180 | |
| 1181 | void GenericBinaryOpStub::GenerateRegisterArgsPush(MacroAssembler* masm) { |
| 1182 | ASSERT(HasArgsInRegisters()); |
| 1183 | __ pop(ecx); |
| 1184 | if (HasArgsReversed()) { |
| 1185 | __ push(eax); |
| 1186 | __ push(edx); |
| 1187 | } else { |
| 1188 | __ push(edx); |
| 1189 | __ push(eax); |
| 1190 | } |
| 1191 | __ push(ecx); |
| 1192 | } |
| 1193 | |
| 1194 | |
| 1195 | void GenericBinaryOpStub::GenerateTypeTransition(MacroAssembler* masm) { |
| 1196 | // Ensure the operands are on the stack. |
| 1197 | if (HasArgsInRegisters()) { |
| 1198 | GenerateRegisterArgsPush(masm); |
| 1199 | } |
| 1200 | |
| 1201 | __ pop(ecx); // Save return address. |
| 1202 | |
| 1203 | // Left and right arguments are now on top. |
| 1204 | // Push this stub's key. Although the operation and the type info are |
| 1205 | // encoded into the key, the encoding is opaque, so push them too. |
| 1206 | __ push(Immediate(Smi::FromInt(MinorKey()))); |
| 1207 | __ push(Immediate(Smi::FromInt(op_))); |
| 1208 | __ push(Immediate(Smi::FromInt(runtime_operands_type_))); |
| 1209 | |
| 1210 | __ push(ecx); // Push return address. |
| 1211 | |
| 1212 | // Patch the caller to an appropriate specialized stub and return the |
| 1213 | // operation result to the caller of the stub. |
| 1214 | __ TailCallExternalReference( |
| 1215 | ExternalReference(IC_Utility(IC::kBinaryOp_Patch)), |
| 1216 | 5, |
| 1217 | 1); |
| 1218 | } |
| 1219 | |
| 1220 | |
| 1221 | Handle<Code> GetBinaryOpStub(int key, BinaryOpIC::TypeInfo type_info) { |
| 1222 | GenericBinaryOpStub stub(key, type_info); |
| 1223 | return stub.GetCode(); |
| 1224 | } |
| 1225 | |
| 1226 | |
| 1227 | void TranscendentalCacheStub::Generate(MacroAssembler* masm) { |
| 1228 | // Input on stack: |
| 1229 | // esp[4]: argument (should be number). |
| 1230 | // esp[0]: return address. |
| 1231 | // Test that eax is a number. |
| 1232 | Label runtime_call; |
| 1233 | Label runtime_call_clear_stack; |
| 1234 | Label input_not_smi; |
| 1235 | Label loaded; |
| 1236 | __ mov(eax, Operand(esp, kPointerSize)); |
| 1237 | __ test(eax, Immediate(kSmiTagMask)); |
| 1238 | __ j(not_zero, &input_not_smi); |
| 1239 | // Input is a smi. Untag and load it onto the FPU stack. |
| 1240 | // Then load the low and high words of the double into ebx, edx. |
| 1241 | STATIC_ASSERT(kSmiTagSize == 1); |
| 1242 | __ sar(eax, 1); |
| 1243 | __ sub(Operand(esp), Immediate(2 * kPointerSize)); |
| 1244 | __ mov(Operand(esp, 0), eax); |
| 1245 | __ fild_s(Operand(esp, 0)); |
| 1246 | __ fst_d(Operand(esp, 0)); |
| 1247 | __ pop(edx); |
| 1248 | __ pop(ebx); |
| 1249 | __ jmp(&loaded); |
| 1250 | __ bind(&input_not_smi); |
| 1251 | // Check if input is a HeapNumber. |
| 1252 | __ mov(ebx, FieldOperand(eax, HeapObject::kMapOffset)); |
| 1253 | __ cmp(Operand(ebx), Immediate(Factory::heap_number_map())); |
| 1254 | __ j(not_equal, &runtime_call); |
| 1255 | // Input is a HeapNumber. Push it on the FPU stack and load its |
| 1256 | // low and high words into ebx, edx. |
| 1257 | __ fld_d(FieldOperand(eax, HeapNumber::kValueOffset)); |
| 1258 | __ mov(edx, FieldOperand(eax, HeapNumber::kExponentOffset)); |
| 1259 | __ mov(ebx, FieldOperand(eax, HeapNumber::kMantissaOffset)); |
| 1260 | |
| 1261 | __ bind(&loaded); |
| 1262 | // ST[0] == double value |
| 1263 | // ebx = low 32 bits of double value |
| 1264 | // edx = high 32 bits of double value |
| 1265 | // Compute hash (the shifts are arithmetic): |
| 1266 | // h = (low ^ high); h ^= h >> 16; h ^= h >> 8; h = h & (cacheSize - 1); |
| 1267 | __ mov(ecx, ebx); |
| 1268 | __ xor_(ecx, Operand(edx)); |
| 1269 | __ mov(eax, ecx); |
| 1270 | __ sar(eax, 16); |
| 1271 | __ xor_(ecx, Operand(eax)); |
| 1272 | __ mov(eax, ecx); |
| 1273 | __ sar(eax, 8); |
| 1274 | __ xor_(ecx, Operand(eax)); |
| 1275 | ASSERT(IsPowerOf2(TranscendentalCache::kCacheSize)); |
| 1276 | __ and_(Operand(ecx), Immediate(TranscendentalCache::kCacheSize - 1)); |
| 1277 | |
| 1278 | // ST[0] == double value. |
| 1279 | // ebx = low 32 bits of double value. |
| 1280 | // edx = high 32 bits of double value. |
| 1281 | // ecx = TranscendentalCache::hash(double value). |
| 1282 | __ mov(eax, |
| 1283 | Immediate(ExternalReference::transcendental_cache_array_address())); |
| 1284 | // Eax points to cache array. |
| 1285 | __ mov(eax, Operand(eax, type_ * sizeof(TranscendentalCache::caches_[0]))); |
| 1286 | // Eax points to the cache for the type type_. |
| 1287 | // If NULL, the cache hasn't been initialized yet, so go through runtime. |
| 1288 | __ test(eax, Operand(eax)); |
| 1289 | __ j(zero, &runtime_call_clear_stack); |
| 1290 | #ifdef DEBUG |
| 1291 | // Check that the layout of cache elements match expectations. |
| 1292 | { TranscendentalCache::Element test_elem[2]; |
| 1293 | char* elem_start = reinterpret_cast<char*>(&test_elem[0]); |
| 1294 | char* elem2_start = reinterpret_cast<char*>(&test_elem[1]); |
| 1295 | char* elem_in0 = reinterpret_cast<char*>(&(test_elem[0].in[0])); |
| 1296 | char* elem_in1 = reinterpret_cast<char*>(&(test_elem[0].in[1])); |
| 1297 | char* elem_out = reinterpret_cast<char*>(&(test_elem[0].output)); |
| 1298 | CHECK_EQ(12, elem2_start - elem_start); // Two uint_32's and a pointer. |
| 1299 | CHECK_EQ(0, elem_in0 - elem_start); |
| 1300 | CHECK_EQ(kIntSize, elem_in1 - elem_start); |
| 1301 | CHECK_EQ(2 * kIntSize, elem_out - elem_start); |
| 1302 | } |
| 1303 | #endif |
| 1304 | // Find the address of the ecx'th entry in the cache, i.e., &eax[ecx*12]. |
| 1305 | __ lea(ecx, Operand(ecx, ecx, times_2, 0)); |
| 1306 | __ lea(ecx, Operand(eax, ecx, times_4, 0)); |
| 1307 | // Check if cache matches: Double value is stored in uint32_t[2] array. |
| 1308 | Label cache_miss; |
| 1309 | __ cmp(ebx, Operand(ecx, 0)); |
| 1310 | __ j(not_equal, &cache_miss); |
| 1311 | __ cmp(edx, Operand(ecx, kIntSize)); |
| 1312 | __ j(not_equal, &cache_miss); |
| 1313 | // Cache hit! |
| 1314 | __ mov(eax, Operand(ecx, 2 * kIntSize)); |
| 1315 | __ fstp(0); |
| 1316 | __ ret(kPointerSize); |
| 1317 | |
| 1318 | __ bind(&cache_miss); |
| 1319 | // Update cache with new value. |
| 1320 | // We are short on registers, so use no_reg as scratch. |
| 1321 | // This gives slightly larger code. |
| 1322 | __ AllocateHeapNumber(eax, edi, no_reg, &runtime_call_clear_stack); |
| 1323 | GenerateOperation(masm); |
| 1324 | __ mov(Operand(ecx, 0), ebx); |
| 1325 | __ mov(Operand(ecx, kIntSize), edx); |
| 1326 | __ mov(Operand(ecx, 2 * kIntSize), eax); |
| 1327 | __ fstp_d(FieldOperand(eax, HeapNumber::kValueOffset)); |
| 1328 | __ ret(kPointerSize); |
| 1329 | |
| 1330 | __ bind(&runtime_call_clear_stack); |
| 1331 | __ fstp(0); |
| 1332 | __ bind(&runtime_call); |
| 1333 | __ TailCallExternalReference(ExternalReference(RuntimeFunction()), 1, 1); |
| 1334 | } |
| 1335 | |
| 1336 | |
| 1337 | Runtime::FunctionId TranscendentalCacheStub::RuntimeFunction() { |
| 1338 | switch (type_) { |
| 1339 | // Add more cases when necessary. |
| 1340 | case TranscendentalCache::SIN: return Runtime::kMath_sin; |
| 1341 | case TranscendentalCache::COS: return Runtime::kMath_cos; |
| 1342 | default: |
| 1343 | UNIMPLEMENTED(); |
| 1344 | return Runtime::kAbort; |
| 1345 | } |
| 1346 | } |
| 1347 | |
| 1348 | |
| 1349 | void TranscendentalCacheStub::GenerateOperation(MacroAssembler* masm) { |
| 1350 | // Only free register is edi. |
| 1351 | Label done; |
| 1352 | ASSERT(type_ == TranscendentalCache::SIN || |
| 1353 | type_ == TranscendentalCache::COS); |
| 1354 | // More transcendental types can be added later. |
| 1355 | |
| 1356 | // Both fsin and fcos require arguments in the range +/-2^63 and |
| 1357 | // return NaN for infinities and NaN. They can share all code except |
| 1358 | // the actual fsin/fcos operation. |
| 1359 | Label in_range; |
| 1360 | // If argument is outside the range -2^63..2^63, fsin/cos doesn't |
| 1361 | // work. We must reduce it to the appropriate range. |
| 1362 | __ mov(edi, edx); |
| 1363 | __ and_(Operand(edi), Immediate(0x7ff00000)); // Exponent only. |
| 1364 | int supported_exponent_limit = |
| 1365 | (63 + HeapNumber::kExponentBias) << HeapNumber::kExponentShift; |
| 1366 | __ cmp(Operand(edi), Immediate(supported_exponent_limit)); |
| 1367 | __ j(below, &in_range, taken); |
| 1368 | // Check for infinity and NaN. Both return NaN for sin. |
| 1369 | __ cmp(Operand(edi), Immediate(0x7ff00000)); |
| 1370 | Label non_nan_result; |
| 1371 | __ j(not_equal, &non_nan_result, taken); |
| 1372 | // Input is +/-Infinity or NaN. Result is NaN. |
| 1373 | __ fstp(0); |
| 1374 | // NaN is represented by 0x7ff8000000000000. |
| 1375 | __ push(Immediate(0x7ff80000)); |
| 1376 | __ push(Immediate(0)); |
| 1377 | __ fld_d(Operand(esp, 0)); |
| 1378 | __ add(Operand(esp), Immediate(2 * kPointerSize)); |
| 1379 | __ jmp(&done); |
| 1380 | |
| 1381 | __ bind(&non_nan_result); |
| 1382 | |
| 1383 | // Use fpmod to restrict argument to the range +/-2*PI. |
| 1384 | __ mov(edi, eax); // Save eax before using fnstsw_ax. |
| 1385 | __ fldpi(); |
| 1386 | __ fadd(0); |
| 1387 | __ fld(1); |
| 1388 | // FPU Stack: input, 2*pi, input. |
| 1389 | { |
| 1390 | Label no_exceptions; |
| 1391 | __ fwait(); |
| 1392 | __ fnstsw_ax(); |
| 1393 | // Clear if Illegal Operand or Zero Division exceptions are set. |
| 1394 | __ test(Operand(eax), Immediate(5)); |
| 1395 | __ j(zero, &no_exceptions); |
| 1396 | __ fnclex(); |
| 1397 | __ bind(&no_exceptions); |
| 1398 | } |
| 1399 | |
| 1400 | // Compute st(0) % st(1) |
| 1401 | { |
| 1402 | Label partial_remainder_loop; |
| 1403 | __ bind(&partial_remainder_loop); |
| 1404 | __ fprem1(); |
| 1405 | __ fwait(); |
| 1406 | __ fnstsw_ax(); |
| 1407 | __ test(Operand(eax), Immediate(0x400 /* C2 */)); |
| 1408 | // If C2 is set, computation only has partial result. Loop to |
| 1409 | // continue computation. |
| 1410 | __ j(not_zero, &partial_remainder_loop); |
| 1411 | } |
| 1412 | // FPU Stack: input, 2*pi, input % 2*pi |
| 1413 | __ fstp(2); |
| 1414 | __ fstp(0); |
| 1415 | __ mov(eax, edi); // Restore eax (allocated HeapNumber pointer). |
| 1416 | |
| 1417 | // FPU Stack: input % 2*pi |
| 1418 | __ bind(&in_range); |
| 1419 | switch (type_) { |
| 1420 | case TranscendentalCache::SIN: |
| 1421 | __ fsin(); |
| 1422 | break; |
| 1423 | case TranscendentalCache::COS: |
| 1424 | __ fcos(); |
| 1425 | break; |
| 1426 | default: |
| 1427 | UNREACHABLE(); |
| 1428 | } |
| 1429 | __ bind(&done); |
| 1430 | } |
| 1431 | |
| 1432 | |
| 1433 | // Get the integer part of a heap number. Surprisingly, all this bit twiddling |
| 1434 | // is faster than using the built-in instructions on floating point registers. |
| 1435 | // Trashes edi and ebx. Dest is ecx. Source cannot be ecx or one of the |
| 1436 | // trashed registers. |
| 1437 | void IntegerConvert(MacroAssembler* masm, |
| 1438 | Register source, |
| 1439 | TypeInfo type_info, |
| 1440 | bool use_sse3, |
| 1441 | Label* conversion_failure) { |
| 1442 | ASSERT(!source.is(ecx) && !source.is(edi) && !source.is(ebx)); |
| 1443 | Label done, right_exponent, normal_exponent; |
| 1444 | Register scratch = ebx; |
| 1445 | Register scratch2 = edi; |
| 1446 | if (type_info.IsInteger32() && CpuFeatures::IsEnabled(SSE2)) { |
| 1447 | CpuFeatures::Scope scope(SSE2); |
| 1448 | __ cvttsd2si(ecx, FieldOperand(source, HeapNumber::kValueOffset)); |
| 1449 | return; |
| 1450 | } |
| 1451 | if (!type_info.IsInteger32() || !use_sse3) { |
| 1452 | // Get exponent word. |
| 1453 | __ mov(scratch, FieldOperand(source, HeapNumber::kExponentOffset)); |
| 1454 | // Get exponent alone in scratch2. |
| 1455 | __ mov(scratch2, scratch); |
| 1456 | __ and_(scratch2, HeapNumber::kExponentMask); |
| 1457 | } |
| 1458 | if (use_sse3) { |
| 1459 | CpuFeatures::Scope scope(SSE3); |
| 1460 | if (!type_info.IsInteger32()) { |
| 1461 | // Check whether the exponent is too big for a 64 bit signed integer. |
| 1462 | static const uint32_t kTooBigExponent = |
| 1463 | (HeapNumber::kExponentBias + 63) << HeapNumber::kExponentShift; |
| 1464 | __ cmp(Operand(scratch2), Immediate(kTooBigExponent)); |
| 1465 | __ j(greater_equal, conversion_failure); |
| 1466 | } |
| 1467 | // Load x87 register with heap number. |
| 1468 | __ fld_d(FieldOperand(source, HeapNumber::kValueOffset)); |
| 1469 | // Reserve space for 64 bit answer. |
| 1470 | __ sub(Operand(esp), Immediate(sizeof(uint64_t))); // Nolint. |
| 1471 | // Do conversion, which cannot fail because we checked the exponent. |
| 1472 | __ fisttp_d(Operand(esp, 0)); |
| 1473 | __ mov(ecx, Operand(esp, 0)); // Load low word of answer into ecx. |
| 1474 | __ add(Operand(esp), Immediate(sizeof(uint64_t))); // Nolint. |
| 1475 | } else { |
| 1476 | // Load ecx with zero. We use this either for the final shift or |
| 1477 | // for the answer. |
| 1478 | __ xor_(ecx, Operand(ecx)); |
| 1479 | // Check whether the exponent matches a 32 bit signed int that cannot be |
| 1480 | // represented by a Smi. A non-smi 32 bit integer is 1.xxx * 2^30 so the |
| 1481 | // exponent is 30 (biased). This is the exponent that we are fastest at and |
| 1482 | // also the highest exponent we can handle here. |
| 1483 | const uint32_t non_smi_exponent = |
| 1484 | (HeapNumber::kExponentBias + 30) << HeapNumber::kExponentShift; |
| 1485 | __ cmp(Operand(scratch2), Immediate(non_smi_exponent)); |
| 1486 | // If we have a match of the int32-but-not-Smi exponent then skip some |
| 1487 | // logic. |
| 1488 | __ j(equal, &right_exponent); |
| 1489 | // If the exponent is higher than that then go to slow case. This catches |
| 1490 | // numbers that don't fit in a signed int32, infinities and NaNs. |
| 1491 | __ j(less, &normal_exponent); |
| 1492 | |
| 1493 | { |
| 1494 | // Handle a big exponent. The only reason we have this code is that the |
| 1495 | // >>> operator has a tendency to generate numbers with an exponent of 31. |
| 1496 | const uint32_t big_non_smi_exponent = |
| 1497 | (HeapNumber::kExponentBias + 31) << HeapNumber::kExponentShift; |
| 1498 | __ cmp(Operand(scratch2), Immediate(big_non_smi_exponent)); |
| 1499 | __ j(not_equal, conversion_failure); |
| 1500 | // We have the big exponent, typically from >>>. This means the number is |
| 1501 | // in the range 2^31 to 2^32 - 1. Get the top bits of the mantissa. |
| 1502 | __ mov(scratch2, scratch); |
| 1503 | __ and_(scratch2, HeapNumber::kMantissaMask); |
| 1504 | // Put back the implicit 1. |
| 1505 | __ or_(scratch2, 1 << HeapNumber::kExponentShift); |
| 1506 | // Shift up the mantissa bits to take up the space the exponent used to |
| 1507 | // take. We just orred in the implicit bit so that took care of one and |
| 1508 | // we want to use the full unsigned range so we subtract 1 bit from the |
| 1509 | // shift distance. |
| 1510 | const int big_shift_distance = HeapNumber::kNonMantissaBitsInTopWord - 1; |
| 1511 | __ shl(scratch2, big_shift_distance); |
| 1512 | // Get the second half of the double. |
| 1513 | __ mov(ecx, FieldOperand(source, HeapNumber::kMantissaOffset)); |
| 1514 | // Shift down 21 bits to get the most significant 11 bits or the low |
| 1515 | // mantissa word. |
| 1516 | __ shr(ecx, 32 - big_shift_distance); |
| 1517 | __ or_(ecx, Operand(scratch2)); |
| 1518 | // We have the answer in ecx, but we may need to negate it. |
| 1519 | __ test(scratch, Operand(scratch)); |
| 1520 | __ j(positive, &done); |
| 1521 | __ neg(ecx); |
| 1522 | __ jmp(&done); |
| 1523 | } |
| 1524 | |
| 1525 | __ bind(&normal_exponent); |
| 1526 | // Exponent word in scratch, exponent part of exponent word in scratch2. |
| 1527 | // Zero in ecx. |
| 1528 | // We know the exponent is smaller than 30 (biased). If it is less than |
| 1529 | // 0 (biased) then the number is smaller in magnitude than 1.0 * 2^0, ie |
| 1530 | // it rounds to zero. |
| 1531 | const uint32_t zero_exponent = |
| 1532 | (HeapNumber::kExponentBias + 0) << HeapNumber::kExponentShift; |
| 1533 | __ sub(Operand(scratch2), Immediate(zero_exponent)); |
| 1534 | // ecx already has a Smi zero. |
| 1535 | __ j(less, &done); |
| 1536 | |
| 1537 | // We have a shifted exponent between 0 and 30 in scratch2. |
| 1538 | __ shr(scratch2, HeapNumber::kExponentShift); |
| 1539 | __ mov(ecx, Immediate(30)); |
| 1540 | __ sub(ecx, Operand(scratch2)); |
| 1541 | |
| 1542 | __ bind(&right_exponent); |
| 1543 | // Here ecx is the shift, scratch is the exponent word. |
| 1544 | // Get the top bits of the mantissa. |
| 1545 | __ and_(scratch, HeapNumber::kMantissaMask); |
| 1546 | // Put back the implicit 1. |
| 1547 | __ or_(scratch, 1 << HeapNumber::kExponentShift); |
| 1548 | // Shift up the mantissa bits to take up the space the exponent used to |
| 1549 | // take. We have kExponentShift + 1 significant bits int he low end of the |
| 1550 | // word. Shift them to the top bits. |
| 1551 | const int shift_distance = HeapNumber::kNonMantissaBitsInTopWord - 2; |
| 1552 | __ shl(scratch, shift_distance); |
| 1553 | // Get the second half of the double. For some exponents we don't |
| 1554 | // actually need this because the bits get shifted out again, but |
| 1555 | // it's probably slower to test than just to do it. |
| 1556 | __ mov(scratch2, FieldOperand(source, HeapNumber::kMantissaOffset)); |
| 1557 | // Shift down 22 bits to get the most significant 10 bits or the low |
| 1558 | // mantissa word. |
| 1559 | __ shr(scratch2, 32 - shift_distance); |
| 1560 | __ or_(scratch2, Operand(scratch)); |
| 1561 | // Move down according to the exponent. |
| 1562 | __ shr_cl(scratch2); |
| 1563 | // Now the unsigned answer is in scratch2. We need to move it to ecx and |
| 1564 | // we may need to fix the sign. |
| 1565 | Label negative; |
| 1566 | __ xor_(ecx, Operand(ecx)); |
| 1567 | __ cmp(ecx, FieldOperand(source, HeapNumber::kExponentOffset)); |
| 1568 | __ j(greater, &negative); |
| 1569 | __ mov(ecx, scratch2); |
| 1570 | __ jmp(&done); |
| 1571 | __ bind(&negative); |
| 1572 | __ sub(ecx, Operand(scratch2)); |
| 1573 | __ bind(&done); |
| 1574 | } |
| 1575 | } |
| 1576 | |
| 1577 | |
| 1578 | // Input: edx, eax are the left and right objects of a bit op. |
| 1579 | // Output: eax, ecx are left and right integers for a bit op. |
| 1580 | void FloatingPointHelper::LoadNumbersAsIntegers(MacroAssembler* masm, |
| 1581 | TypeInfo type_info, |
| 1582 | bool use_sse3, |
| 1583 | Label* conversion_failure) { |
| 1584 | // Check float operands. |
| 1585 | Label arg1_is_object, check_undefined_arg1; |
| 1586 | Label arg2_is_object, check_undefined_arg2; |
| 1587 | Label load_arg2, done; |
| 1588 | |
| 1589 | if (!type_info.IsDouble()) { |
| 1590 | if (!type_info.IsSmi()) { |
| 1591 | __ test(edx, Immediate(kSmiTagMask)); |
| 1592 | __ j(not_zero, &arg1_is_object); |
| 1593 | } else { |
| 1594 | if (FLAG_debug_code) __ AbortIfNotSmi(edx); |
| 1595 | } |
| 1596 | __ SmiUntag(edx); |
| 1597 | __ jmp(&load_arg2); |
| 1598 | } |
| 1599 | |
| 1600 | __ bind(&arg1_is_object); |
| 1601 | |
| 1602 | // Get the untagged integer version of the edx heap number in ecx. |
| 1603 | IntegerConvert(masm, edx, type_info, use_sse3, conversion_failure); |
| 1604 | __ mov(edx, ecx); |
| 1605 | |
| 1606 | // Here edx has the untagged integer, eax has a Smi or a heap number. |
| 1607 | __ bind(&load_arg2); |
| 1608 | if (!type_info.IsDouble()) { |
| 1609 | // Test if arg2 is a Smi. |
| 1610 | if (!type_info.IsSmi()) { |
| 1611 | __ test(eax, Immediate(kSmiTagMask)); |
| 1612 | __ j(not_zero, &arg2_is_object); |
| 1613 | } else { |
| 1614 | if (FLAG_debug_code) __ AbortIfNotSmi(eax); |
| 1615 | } |
| 1616 | __ SmiUntag(eax); |
| 1617 | __ mov(ecx, eax); |
| 1618 | __ jmp(&done); |
| 1619 | } |
| 1620 | |
| 1621 | __ bind(&arg2_is_object); |
| 1622 | |
| 1623 | // Get the untagged integer version of the eax heap number in ecx. |
| 1624 | IntegerConvert(masm, eax, type_info, use_sse3, conversion_failure); |
| 1625 | __ bind(&done); |
| 1626 | __ mov(eax, edx); |
| 1627 | } |
| 1628 | |
| 1629 | |
| 1630 | // Input: edx, eax are the left and right objects of a bit op. |
| 1631 | // Output: eax, ecx are left and right integers for a bit op. |
| 1632 | void FloatingPointHelper::LoadUnknownsAsIntegers(MacroAssembler* masm, |
| 1633 | bool use_sse3, |
| 1634 | Label* conversion_failure) { |
| 1635 | // Check float operands. |
| 1636 | Label arg1_is_object, check_undefined_arg1; |
| 1637 | Label arg2_is_object, check_undefined_arg2; |
| 1638 | Label load_arg2, done; |
| 1639 | |
| 1640 | // Test if arg1 is a Smi. |
| 1641 | __ test(edx, Immediate(kSmiTagMask)); |
| 1642 | __ j(not_zero, &arg1_is_object); |
| 1643 | |
| 1644 | __ SmiUntag(edx); |
| 1645 | __ jmp(&load_arg2); |
| 1646 | |
| 1647 | // If the argument is undefined it converts to zero (ECMA-262, section 9.5). |
| 1648 | __ bind(&check_undefined_arg1); |
| 1649 | __ cmp(edx, Factory::undefined_value()); |
| 1650 | __ j(not_equal, conversion_failure); |
| 1651 | __ mov(edx, Immediate(0)); |
| 1652 | __ jmp(&load_arg2); |
| 1653 | |
| 1654 | __ bind(&arg1_is_object); |
| 1655 | __ mov(ebx, FieldOperand(edx, HeapObject::kMapOffset)); |
| 1656 | __ cmp(ebx, Factory::heap_number_map()); |
| 1657 | __ j(not_equal, &check_undefined_arg1); |
| 1658 | |
| 1659 | // Get the untagged integer version of the edx heap number in ecx. |
| 1660 | IntegerConvert(masm, |
| 1661 | edx, |
| 1662 | TypeInfo::Unknown(), |
| 1663 | use_sse3, |
| 1664 | conversion_failure); |
| 1665 | __ mov(edx, ecx); |
| 1666 | |
| 1667 | // Here edx has the untagged integer, eax has a Smi or a heap number. |
| 1668 | __ bind(&load_arg2); |
| 1669 | |
| 1670 | // Test if arg2 is a Smi. |
| 1671 | __ test(eax, Immediate(kSmiTagMask)); |
| 1672 | __ j(not_zero, &arg2_is_object); |
| 1673 | |
| 1674 | __ SmiUntag(eax); |
| 1675 | __ mov(ecx, eax); |
| 1676 | __ jmp(&done); |
| 1677 | |
| 1678 | // If the argument is undefined it converts to zero (ECMA-262, section 9.5). |
| 1679 | __ bind(&check_undefined_arg2); |
| 1680 | __ cmp(eax, Factory::undefined_value()); |
| 1681 | __ j(not_equal, conversion_failure); |
| 1682 | __ mov(ecx, Immediate(0)); |
| 1683 | __ jmp(&done); |
| 1684 | |
| 1685 | __ bind(&arg2_is_object); |
| 1686 | __ mov(ebx, FieldOperand(eax, HeapObject::kMapOffset)); |
| 1687 | __ cmp(ebx, Factory::heap_number_map()); |
| 1688 | __ j(not_equal, &check_undefined_arg2); |
| 1689 | |
| 1690 | // Get the untagged integer version of the eax heap number in ecx. |
| 1691 | IntegerConvert(masm, |
| 1692 | eax, |
| 1693 | TypeInfo::Unknown(), |
| 1694 | use_sse3, |
| 1695 | conversion_failure); |
| 1696 | __ bind(&done); |
| 1697 | __ mov(eax, edx); |
| 1698 | } |
| 1699 | |
| 1700 | |
| 1701 | void FloatingPointHelper::LoadAsIntegers(MacroAssembler* masm, |
| 1702 | TypeInfo type_info, |
| 1703 | bool use_sse3, |
| 1704 | Label* conversion_failure) { |
| 1705 | if (type_info.IsNumber()) { |
| 1706 | LoadNumbersAsIntegers(masm, type_info, use_sse3, conversion_failure); |
| 1707 | } else { |
| 1708 | LoadUnknownsAsIntegers(masm, use_sse3, conversion_failure); |
| 1709 | } |
| 1710 | } |
| 1711 | |
| 1712 | |
| 1713 | void FloatingPointHelper::LoadFloatOperand(MacroAssembler* masm, |
| 1714 | Register number) { |
| 1715 | Label load_smi, done; |
| 1716 | |
| 1717 | __ test(number, Immediate(kSmiTagMask)); |
| 1718 | __ j(zero, &load_smi, not_taken); |
| 1719 | __ fld_d(FieldOperand(number, HeapNumber::kValueOffset)); |
| 1720 | __ jmp(&done); |
| 1721 | |
| 1722 | __ bind(&load_smi); |
| 1723 | __ SmiUntag(number); |
| 1724 | __ push(number); |
| 1725 | __ fild_s(Operand(esp, 0)); |
| 1726 | __ pop(number); |
| 1727 | |
| 1728 | __ bind(&done); |
| 1729 | } |
| 1730 | |
| 1731 | |
| 1732 | void FloatingPointHelper::LoadSSE2Operands(MacroAssembler* masm) { |
| 1733 | Label load_smi_edx, load_eax, load_smi_eax, done; |
| 1734 | // Load operand in edx into xmm0. |
| 1735 | __ test(edx, Immediate(kSmiTagMask)); |
| 1736 | __ j(zero, &load_smi_edx, not_taken); // Argument in edx is a smi. |
| 1737 | __ movdbl(xmm0, FieldOperand(edx, HeapNumber::kValueOffset)); |
| 1738 | |
| 1739 | __ bind(&load_eax); |
| 1740 | // Load operand in eax into xmm1. |
| 1741 | __ test(eax, Immediate(kSmiTagMask)); |
| 1742 | __ j(zero, &load_smi_eax, not_taken); // Argument in eax is a smi. |
| 1743 | __ movdbl(xmm1, FieldOperand(eax, HeapNumber::kValueOffset)); |
| 1744 | __ jmp(&done); |
| 1745 | |
| 1746 | __ bind(&load_smi_edx); |
| 1747 | __ SmiUntag(edx); // Untag smi before converting to float. |
| 1748 | __ cvtsi2sd(xmm0, Operand(edx)); |
| 1749 | __ SmiTag(edx); // Retag smi for heap number overwriting test. |
| 1750 | __ jmp(&load_eax); |
| 1751 | |
| 1752 | __ bind(&load_smi_eax); |
| 1753 | __ SmiUntag(eax); // Untag smi before converting to float. |
| 1754 | __ cvtsi2sd(xmm1, Operand(eax)); |
| 1755 | __ SmiTag(eax); // Retag smi for heap number overwriting test. |
| 1756 | |
| 1757 | __ bind(&done); |
| 1758 | } |
| 1759 | |
| 1760 | |
| 1761 | void FloatingPointHelper::LoadSSE2Operands(MacroAssembler* masm, |
| 1762 | Label* not_numbers) { |
| 1763 | Label load_smi_edx, load_eax, load_smi_eax, load_float_eax, done; |
| 1764 | // Load operand in edx into xmm0, or branch to not_numbers. |
| 1765 | __ test(edx, Immediate(kSmiTagMask)); |
| 1766 | __ j(zero, &load_smi_edx, not_taken); // Argument in edx is a smi. |
| 1767 | __ cmp(FieldOperand(edx, HeapObject::kMapOffset), Factory::heap_number_map()); |
| 1768 | __ j(not_equal, not_numbers); // Argument in edx is not a number. |
| 1769 | __ movdbl(xmm0, FieldOperand(edx, HeapNumber::kValueOffset)); |
| 1770 | __ bind(&load_eax); |
| 1771 | // Load operand in eax into xmm1, or branch to not_numbers. |
| 1772 | __ test(eax, Immediate(kSmiTagMask)); |
| 1773 | __ j(zero, &load_smi_eax, not_taken); // Argument in eax is a smi. |
| 1774 | __ cmp(FieldOperand(eax, HeapObject::kMapOffset), Factory::heap_number_map()); |
| 1775 | __ j(equal, &load_float_eax); |
| 1776 | __ jmp(not_numbers); // Argument in eax is not a number. |
| 1777 | __ bind(&load_smi_edx); |
| 1778 | __ SmiUntag(edx); // Untag smi before converting to float. |
| 1779 | __ cvtsi2sd(xmm0, Operand(edx)); |
| 1780 | __ SmiTag(edx); // Retag smi for heap number overwriting test. |
| 1781 | __ jmp(&load_eax); |
| 1782 | __ bind(&load_smi_eax); |
| 1783 | __ SmiUntag(eax); // Untag smi before converting to float. |
| 1784 | __ cvtsi2sd(xmm1, Operand(eax)); |
| 1785 | __ SmiTag(eax); // Retag smi for heap number overwriting test. |
| 1786 | __ jmp(&done); |
| 1787 | __ bind(&load_float_eax); |
| 1788 | __ movdbl(xmm1, FieldOperand(eax, HeapNumber::kValueOffset)); |
| 1789 | __ bind(&done); |
| 1790 | } |
| 1791 | |
| 1792 | |
| 1793 | void FloatingPointHelper::LoadSSE2Smis(MacroAssembler* masm, |
| 1794 | Register scratch) { |
| 1795 | const Register left = edx; |
| 1796 | const Register right = eax; |
| 1797 | __ mov(scratch, left); |
| 1798 | ASSERT(!scratch.is(right)); // We're about to clobber scratch. |
| 1799 | __ SmiUntag(scratch); |
| 1800 | __ cvtsi2sd(xmm0, Operand(scratch)); |
| 1801 | |
| 1802 | __ mov(scratch, right); |
| 1803 | __ SmiUntag(scratch); |
| 1804 | __ cvtsi2sd(xmm1, Operand(scratch)); |
| 1805 | } |
| 1806 | |
| 1807 | |
| 1808 | void FloatingPointHelper::LoadFloatOperands(MacroAssembler* masm, |
| 1809 | Register scratch, |
| 1810 | ArgLocation arg_location) { |
| 1811 | Label load_smi_1, load_smi_2, done_load_1, done; |
| 1812 | if (arg_location == ARGS_IN_REGISTERS) { |
| 1813 | __ mov(scratch, edx); |
| 1814 | } else { |
| 1815 | __ mov(scratch, Operand(esp, 2 * kPointerSize)); |
| 1816 | } |
| 1817 | __ test(scratch, Immediate(kSmiTagMask)); |
| 1818 | __ j(zero, &load_smi_1, not_taken); |
| 1819 | __ fld_d(FieldOperand(scratch, HeapNumber::kValueOffset)); |
| 1820 | __ bind(&done_load_1); |
| 1821 | |
| 1822 | if (arg_location == ARGS_IN_REGISTERS) { |
| 1823 | __ mov(scratch, eax); |
| 1824 | } else { |
| 1825 | __ mov(scratch, Operand(esp, 1 * kPointerSize)); |
| 1826 | } |
| 1827 | __ test(scratch, Immediate(kSmiTagMask)); |
| 1828 | __ j(zero, &load_smi_2, not_taken); |
| 1829 | __ fld_d(FieldOperand(scratch, HeapNumber::kValueOffset)); |
| 1830 | __ jmp(&done); |
| 1831 | |
| 1832 | __ bind(&load_smi_1); |
| 1833 | __ SmiUntag(scratch); |
| 1834 | __ push(scratch); |
| 1835 | __ fild_s(Operand(esp, 0)); |
| 1836 | __ pop(scratch); |
| 1837 | __ jmp(&done_load_1); |
| 1838 | |
| 1839 | __ bind(&load_smi_2); |
| 1840 | __ SmiUntag(scratch); |
| 1841 | __ push(scratch); |
| 1842 | __ fild_s(Operand(esp, 0)); |
| 1843 | __ pop(scratch); |
| 1844 | |
| 1845 | __ bind(&done); |
| 1846 | } |
| 1847 | |
| 1848 | |
| 1849 | void FloatingPointHelper::LoadFloatSmis(MacroAssembler* masm, |
| 1850 | Register scratch) { |
| 1851 | const Register left = edx; |
| 1852 | const Register right = eax; |
| 1853 | __ mov(scratch, left); |
| 1854 | ASSERT(!scratch.is(right)); // We're about to clobber scratch. |
| 1855 | __ SmiUntag(scratch); |
| 1856 | __ push(scratch); |
| 1857 | __ fild_s(Operand(esp, 0)); |
| 1858 | |
| 1859 | __ mov(scratch, right); |
| 1860 | __ SmiUntag(scratch); |
| 1861 | __ mov(Operand(esp, 0), scratch); |
| 1862 | __ fild_s(Operand(esp, 0)); |
| 1863 | __ pop(scratch); |
| 1864 | } |
| 1865 | |
| 1866 | |
| 1867 | void FloatingPointHelper::CheckFloatOperands(MacroAssembler* masm, |
| 1868 | Label* non_float, |
| 1869 | Register scratch) { |
| 1870 | Label test_other, done; |
| 1871 | // Test if both operands are floats or smi -> scratch=k_is_float; |
| 1872 | // Otherwise scratch = k_not_float. |
| 1873 | __ test(edx, Immediate(kSmiTagMask)); |
| 1874 | __ j(zero, &test_other, not_taken); // argument in edx is OK |
| 1875 | __ mov(scratch, FieldOperand(edx, HeapObject::kMapOffset)); |
| 1876 | __ cmp(scratch, Factory::heap_number_map()); |
| 1877 | __ j(not_equal, non_float); // argument in edx is not a number -> NaN |
| 1878 | |
| 1879 | __ bind(&test_other); |
| 1880 | __ test(eax, Immediate(kSmiTagMask)); |
| 1881 | __ j(zero, &done); // argument in eax is OK |
| 1882 | __ mov(scratch, FieldOperand(eax, HeapObject::kMapOffset)); |
| 1883 | __ cmp(scratch, Factory::heap_number_map()); |
| 1884 | __ j(not_equal, non_float); // argument in eax is not a number -> NaN |
| 1885 | |
| 1886 | // Fall-through: Both operands are numbers. |
| 1887 | __ bind(&done); |
| 1888 | } |
| 1889 | |
| 1890 | |
| 1891 | void GenericUnaryOpStub::Generate(MacroAssembler* masm) { |
| 1892 | Label slow, done; |
| 1893 | |
| 1894 | if (op_ == Token::SUB) { |
| 1895 | // Check whether the value is a smi. |
| 1896 | Label try_float; |
| 1897 | __ test(eax, Immediate(kSmiTagMask)); |
| 1898 | __ j(not_zero, &try_float, not_taken); |
| 1899 | |
| 1900 | if (negative_zero_ == kStrictNegativeZero) { |
| 1901 | // Go slow case if the value of the expression is zero |
| 1902 | // to make sure that we switch between 0 and -0. |
| 1903 | __ test(eax, Operand(eax)); |
| 1904 | __ j(zero, &slow, not_taken); |
| 1905 | } |
| 1906 | |
| 1907 | // The value of the expression is a smi that is not zero. Try |
| 1908 | // optimistic subtraction '0 - value'. |
| 1909 | Label undo; |
| 1910 | __ mov(edx, Operand(eax)); |
| 1911 | __ Set(eax, Immediate(0)); |
| 1912 | __ sub(eax, Operand(edx)); |
| 1913 | __ j(no_overflow, &done, taken); |
| 1914 | |
| 1915 | // Restore eax and go slow case. |
| 1916 | __ bind(&undo); |
| 1917 | __ mov(eax, Operand(edx)); |
| 1918 | __ jmp(&slow); |
| 1919 | |
| 1920 | // Try floating point case. |
| 1921 | __ bind(&try_float); |
| 1922 | __ mov(edx, FieldOperand(eax, HeapObject::kMapOffset)); |
| 1923 | __ cmp(edx, Factory::heap_number_map()); |
| 1924 | __ j(not_equal, &slow); |
| 1925 | if (overwrite_ == UNARY_OVERWRITE) { |
| 1926 | __ mov(edx, FieldOperand(eax, HeapNumber::kExponentOffset)); |
| 1927 | __ xor_(edx, HeapNumber::kSignMask); // Flip sign. |
| 1928 | __ mov(FieldOperand(eax, HeapNumber::kExponentOffset), edx); |
| 1929 | } else { |
| 1930 | __ mov(edx, Operand(eax)); |
| 1931 | // edx: operand |
| 1932 | __ AllocateHeapNumber(eax, ebx, ecx, &undo); |
| 1933 | // eax: allocated 'empty' number |
| 1934 | __ mov(ecx, FieldOperand(edx, HeapNumber::kExponentOffset)); |
| 1935 | __ xor_(ecx, HeapNumber::kSignMask); // Flip sign. |
| 1936 | __ mov(FieldOperand(eax, HeapNumber::kExponentOffset), ecx); |
| 1937 | __ mov(ecx, FieldOperand(edx, HeapNumber::kMantissaOffset)); |
| 1938 | __ mov(FieldOperand(eax, HeapNumber::kMantissaOffset), ecx); |
| 1939 | } |
| 1940 | } else if (op_ == Token::BIT_NOT) { |
| 1941 | // Check if the operand is a heap number. |
| 1942 | __ mov(edx, FieldOperand(eax, HeapObject::kMapOffset)); |
| 1943 | __ cmp(edx, Factory::heap_number_map()); |
| 1944 | __ j(not_equal, &slow, not_taken); |
| 1945 | |
| 1946 | // Convert the heap number in eax to an untagged integer in ecx. |
| 1947 | IntegerConvert(masm, |
| 1948 | eax, |
| 1949 | TypeInfo::Unknown(), |
| 1950 | CpuFeatures::IsSupported(SSE3), |
| 1951 | &slow); |
| 1952 | |
| 1953 | // Do the bitwise operation and check if the result fits in a smi. |
| 1954 | Label try_float; |
| 1955 | __ not_(ecx); |
| 1956 | __ cmp(ecx, 0xc0000000); |
| 1957 | __ j(sign, &try_float, not_taken); |
| 1958 | |
| 1959 | // Tag the result as a smi and we're done. |
| 1960 | STATIC_ASSERT(kSmiTagSize == 1); |
| 1961 | __ lea(eax, Operand(ecx, times_2, kSmiTag)); |
| 1962 | __ jmp(&done); |
| 1963 | |
| 1964 | // Try to store the result in a heap number. |
| 1965 | __ bind(&try_float); |
| 1966 | if (overwrite_ == UNARY_NO_OVERWRITE) { |
| 1967 | // Allocate a fresh heap number, but don't overwrite eax until |
| 1968 | // we're sure we can do it without going through the slow case |
| 1969 | // that needs the value in eax. |
| 1970 | __ AllocateHeapNumber(ebx, edx, edi, &slow); |
| 1971 | __ mov(eax, Operand(ebx)); |
| 1972 | } |
| 1973 | if (CpuFeatures::IsSupported(SSE2)) { |
| 1974 | CpuFeatures::Scope use_sse2(SSE2); |
| 1975 | __ cvtsi2sd(xmm0, Operand(ecx)); |
| 1976 | __ movdbl(FieldOperand(eax, HeapNumber::kValueOffset), xmm0); |
| 1977 | } else { |
| 1978 | __ push(ecx); |
| 1979 | __ fild_s(Operand(esp, 0)); |
| 1980 | __ pop(ecx); |
| 1981 | __ fstp_d(FieldOperand(eax, HeapNumber::kValueOffset)); |
| 1982 | } |
| 1983 | } else { |
| 1984 | UNIMPLEMENTED(); |
| 1985 | } |
| 1986 | |
| 1987 | // Return from the stub. |
| 1988 | __ bind(&done); |
| 1989 | __ StubReturn(1); |
| 1990 | |
| 1991 | // Handle the slow case by jumping to the JavaScript builtin. |
| 1992 | __ bind(&slow); |
| 1993 | __ pop(ecx); // pop return address. |
| 1994 | __ push(eax); |
| 1995 | __ push(ecx); // push return address |
| 1996 | switch (op_) { |
| 1997 | case Token::SUB: |
| 1998 | __ InvokeBuiltin(Builtins::UNARY_MINUS, JUMP_FUNCTION); |
| 1999 | break; |
| 2000 | case Token::BIT_NOT: |
| 2001 | __ InvokeBuiltin(Builtins::BIT_NOT, JUMP_FUNCTION); |
| 2002 | break; |
| 2003 | default: |
| 2004 | UNREACHABLE(); |
| 2005 | } |
| 2006 | } |
| 2007 | |
| 2008 | |
| 2009 | void ArgumentsAccessStub::GenerateReadElement(MacroAssembler* masm) { |
| 2010 | // The key is in edx and the parameter count is in eax. |
| 2011 | |
| 2012 | // The displacement is used for skipping the frame pointer on the |
| 2013 | // stack. It is the offset of the last parameter (if any) relative |
| 2014 | // to the frame pointer. |
| 2015 | static const int kDisplacement = 1 * kPointerSize; |
| 2016 | |
| 2017 | // Check that the key is a smi. |
| 2018 | Label slow; |
| 2019 | __ test(edx, Immediate(kSmiTagMask)); |
| 2020 | __ j(not_zero, &slow, not_taken); |
| 2021 | |
| 2022 | // Check if the calling frame is an arguments adaptor frame. |
| 2023 | Label adaptor; |
| 2024 | __ mov(ebx, Operand(ebp, StandardFrameConstants::kCallerFPOffset)); |
| 2025 | __ mov(ecx, Operand(ebx, StandardFrameConstants::kContextOffset)); |
| 2026 | __ cmp(Operand(ecx), Immediate(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR))); |
| 2027 | __ j(equal, &adaptor); |
| 2028 | |
| 2029 | // Check index against formal parameters count limit passed in |
| 2030 | // through register eax. Use unsigned comparison to get negative |
| 2031 | // check for free. |
| 2032 | __ cmp(edx, Operand(eax)); |
| 2033 | __ j(above_equal, &slow, not_taken); |
| 2034 | |
| 2035 | // Read the argument from the stack and return it. |
| 2036 | STATIC_ASSERT(kSmiTagSize == 1); |
| 2037 | STATIC_ASSERT(kSmiTag == 0); // Shifting code depends on these. |
| 2038 | __ lea(ebx, Operand(ebp, eax, times_2, 0)); |
| 2039 | __ neg(edx); |
| 2040 | __ mov(eax, Operand(ebx, edx, times_2, kDisplacement)); |
| 2041 | __ ret(0); |
| 2042 | |
| 2043 | // Arguments adaptor case: Check index against actual arguments |
| 2044 | // limit found in the arguments adaptor frame. Use unsigned |
| 2045 | // comparison to get negative check for free. |
| 2046 | __ bind(&adaptor); |
| 2047 | __ mov(ecx, Operand(ebx, ArgumentsAdaptorFrameConstants::kLengthOffset)); |
| 2048 | __ cmp(edx, Operand(ecx)); |
| 2049 | __ j(above_equal, &slow, not_taken); |
| 2050 | |
| 2051 | // Read the argument from the stack and return it. |
| 2052 | STATIC_ASSERT(kSmiTagSize == 1); |
| 2053 | STATIC_ASSERT(kSmiTag == 0); // Shifting code depends on these. |
| 2054 | __ lea(ebx, Operand(ebx, ecx, times_2, 0)); |
| 2055 | __ neg(edx); |
| 2056 | __ mov(eax, Operand(ebx, edx, times_2, kDisplacement)); |
| 2057 | __ ret(0); |
| 2058 | |
| 2059 | // Slow-case: Handle non-smi or out-of-bounds access to arguments |
| 2060 | // by calling the runtime system. |
| 2061 | __ bind(&slow); |
| 2062 | __ pop(ebx); // Return address. |
| 2063 | __ push(edx); |
| 2064 | __ push(ebx); |
| 2065 | __ TailCallRuntime(Runtime::kGetArgumentsProperty, 1, 1); |
| 2066 | } |
| 2067 | |
| 2068 | |
| 2069 | void ArgumentsAccessStub::GenerateNewObject(MacroAssembler* masm) { |
| 2070 | // esp[0] : return address |
| 2071 | // esp[4] : number of parameters |
| 2072 | // esp[8] : receiver displacement |
| 2073 | // esp[16] : function |
| 2074 | |
| 2075 | // The displacement is used for skipping the return address and the |
| 2076 | // frame pointer on the stack. It is the offset of the last |
| 2077 | // parameter (if any) relative to the frame pointer. |
| 2078 | static const int kDisplacement = 2 * kPointerSize; |
| 2079 | |
| 2080 | // Check if the calling frame is an arguments adaptor frame. |
| 2081 | Label adaptor_frame, try_allocate, runtime; |
| 2082 | __ mov(edx, Operand(ebp, StandardFrameConstants::kCallerFPOffset)); |
| 2083 | __ mov(ecx, Operand(edx, StandardFrameConstants::kContextOffset)); |
| 2084 | __ cmp(Operand(ecx), Immediate(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR))); |
| 2085 | __ j(equal, &adaptor_frame); |
| 2086 | |
| 2087 | // Get the length from the frame. |
| 2088 | __ mov(ecx, Operand(esp, 1 * kPointerSize)); |
| 2089 | __ jmp(&try_allocate); |
| 2090 | |
| 2091 | // Patch the arguments.length and the parameters pointer. |
| 2092 | __ bind(&adaptor_frame); |
| 2093 | __ mov(ecx, Operand(edx, ArgumentsAdaptorFrameConstants::kLengthOffset)); |
| 2094 | __ mov(Operand(esp, 1 * kPointerSize), ecx); |
| 2095 | __ lea(edx, Operand(edx, ecx, times_2, kDisplacement)); |
| 2096 | __ mov(Operand(esp, 2 * kPointerSize), edx); |
| 2097 | |
| 2098 | // Try the new space allocation. Start out with computing the size of |
| 2099 | // the arguments object and the elements array. |
| 2100 | Label add_arguments_object; |
| 2101 | __ bind(&try_allocate); |
| 2102 | __ test(ecx, Operand(ecx)); |
| 2103 | __ j(zero, &add_arguments_object); |
| 2104 | __ lea(ecx, Operand(ecx, times_2, FixedArray::kHeaderSize)); |
| 2105 | __ bind(&add_arguments_object); |
| 2106 | __ add(Operand(ecx), Immediate(Heap::kArgumentsObjectSize)); |
| 2107 | |
| 2108 | // Do the allocation of both objects in one go. |
| 2109 | __ AllocateInNewSpace(ecx, eax, edx, ebx, &runtime, TAG_OBJECT); |
| 2110 | |
| 2111 | // Get the arguments boilerplate from the current (global) context. |
| 2112 | int offset = Context::SlotOffset(Context::ARGUMENTS_BOILERPLATE_INDEX); |
| 2113 | __ mov(edi, Operand(esi, Context::SlotOffset(Context::GLOBAL_INDEX))); |
| 2114 | __ mov(edi, FieldOperand(edi, GlobalObject::kGlobalContextOffset)); |
| 2115 | __ mov(edi, Operand(edi, offset)); |
| 2116 | |
| 2117 | // Copy the JS object part. |
| 2118 | for (int i = 0; i < JSObject::kHeaderSize; i += kPointerSize) { |
| 2119 | __ mov(ebx, FieldOperand(edi, i)); |
| 2120 | __ mov(FieldOperand(eax, i), ebx); |
| 2121 | } |
| 2122 | |
| 2123 | // Setup the callee in-object property. |
| 2124 | STATIC_ASSERT(Heap::arguments_callee_index == 0); |
| 2125 | __ mov(ebx, Operand(esp, 3 * kPointerSize)); |
| 2126 | __ mov(FieldOperand(eax, JSObject::kHeaderSize), ebx); |
| 2127 | |
| 2128 | // Get the length (smi tagged) and set that as an in-object property too. |
| 2129 | STATIC_ASSERT(Heap::arguments_length_index == 1); |
| 2130 | __ mov(ecx, Operand(esp, 1 * kPointerSize)); |
| 2131 | __ mov(FieldOperand(eax, JSObject::kHeaderSize + kPointerSize), ecx); |
| 2132 | |
| 2133 | // If there are no actual arguments, we're done. |
| 2134 | Label done; |
| 2135 | __ test(ecx, Operand(ecx)); |
| 2136 | __ j(zero, &done); |
| 2137 | |
| 2138 | // Get the parameters pointer from the stack. |
| 2139 | __ mov(edx, Operand(esp, 2 * kPointerSize)); |
| 2140 | |
| 2141 | // Setup the elements pointer in the allocated arguments object and |
| 2142 | // initialize the header in the elements fixed array. |
| 2143 | __ lea(edi, Operand(eax, Heap::kArgumentsObjectSize)); |
| 2144 | __ mov(FieldOperand(eax, JSObject::kElementsOffset), edi); |
| 2145 | __ mov(FieldOperand(edi, FixedArray::kMapOffset), |
| 2146 | Immediate(Factory::fixed_array_map())); |
| 2147 | __ mov(FieldOperand(edi, FixedArray::kLengthOffset), ecx); |
| 2148 | // Untag the length for the loop below. |
| 2149 | __ SmiUntag(ecx); |
| 2150 | |
| 2151 | // Copy the fixed array slots. |
| 2152 | Label loop; |
| 2153 | __ bind(&loop); |
| 2154 | __ mov(ebx, Operand(edx, -1 * kPointerSize)); // Skip receiver. |
| 2155 | __ mov(FieldOperand(edi, FixedArray::kHeaderSize), ebx); |
| 2156 | __ add(Operand(edi), Immediate(kPointerSize)); |
| 2157 | __ sub(Operand(edx), Immediate(kPointerSize)); |
| 2158 | __ dec(ecx); |
| 2159 | __ j(not_zero, &loop); |
| 2160 | |
| 2161 | // Return and remove the on-stack parameters. |
| 2162 | __ bind(&done); |
| 2163 | __ ret(3 * kPointerSize); |
| 2164 | |
| 2165 | // Do the runtime call to allocate the arguments object. |
| 2166 | __ bind(&runtime); |
| 2167 | __ TailCallRuntime(Runtime::kNewArgumentsFast, 3, 1); |
| 2168 | } |
| 2169 | |
| 2170 | |
| 2171 | void RegExpExecStub::Generate(MacroAssembler* masm) { |
| 2172 | // Just jump directly to runtime if native RegExp is not selected at compile |
| 2173 | // time or if regexp entry in generated code is turned off runtime switch or |
| 2174 | // at compilation. |
| 2175 | #ifdef V8_INTERPRETED_REGEXP |
| 2176 | __ TailCallRuntime(Runtime::kRegExpExec, 4, 1); |
| 2177 | #else // V8_INTERPRETED_REGEXP |
| 2178 | if (!FLAG_regexp_entry_native) { |
| 2179 | __ TailCallRuntime(Runtime::kRegExpExec, 4, 1); |
| 2180 | return; |
| 2181 | } |
| 2182 | |
| 2183 | // Stack frame on entry. |
| 2184 | // esp[0]: return address |
| 2185 | // esp[4]: last_match_info (expected JSArray) |
| 2186 | // esp[8]: previous index |
| 2187 | // esp[12]: subject string |
| 2188 | // esp[16]: JSRegExp object |
| 2189 | |
| 2190 | static const int kLastMatchInfoOffset = 1 * kPointerSize; |
| 2191 | static const int kPreviousIndexOffset = 2 * kPointerSize; |
| 2192 | static const int kSubjectOffset = 3 * kPointerSize; |
| 2193 | static const int kJSRegExpOffset = 4 * kPointerSize; |
| 2194 | |
| 2195 | Label runtime, invoke_regexp; |
| 2196 | |
| 2197 | // Ensure that a RegExp stack is allocated. |
| 2198 | ExternalReference address_of_regexp_stack_memory_address = |
| 2199 | ExternalReference::address_of_regexp_stack_memory_address(); |
| 2200 | ExternalReference address_of_regexp_stack_memory_size = |
| 2201 | ExternalReference::address_of_regexp_stack_memory_size(); |
| 2202 | __ mov(ebx, Operand::StaticVariable(address_of_regexp_stack_memory_size)); |
| 2203 | __ test(ebx, Operand(ebx)); |
| 2204 | __ j(zero, &runtime, not_taken); |
| 2205 | |
| 2206 | // Check that the first argument is a JSRegExp object. |
| 2207 | __ mov(eax, Operand(esp, kJSRegExpOffset)); |
| 2208 | STATIC_ASSERT(kSmiTag == 0); |
| 2209 | __ test(eax, Immediate(kSmiTagMask)); |
| 2210 | __ j(zero, &runtime); |
| 2211 | __ CmpObjectType(eax, JS_REGEXP_TYPE, ecx); |
| 2212 | __ j(not_equal, &runtime); |
| 2213 | // Check that the RegExp has been compiled (data contains a fixed array). |
| 2214 | __ mov(ecx, FieldOperand(eax, JSRegExp::kDataOffset)); |
| 2215 | if (FLAG_debug_code) { |
| 2216 | __ test(ecx, Immediate(kSmiTagMask)); |
| 2217 | __ Check(not_zero, "Unexpected type for RegExp data, FixedArray expected"); |
| 2218 | __ CmpObjectType(ecx, FIXED_ARRAY_TYPE, ebx); |
| 2219 | __ Check(equal, "Unexpected type for RegExp data, FixedArray expected"); |
| 2220 | } |
| 2221 | |
| 2222 | // ecx: RegExp data (FixedArray) |
| 2223 | // Check the type of the RegExp. Only continue if type is JSRegExp::IRREGEXP. |
| 2224 | __ mov(ebx, FieldOperand(ecx, JSRegExp::kDataTagOffset)); |
| 2225 | __ cmp(Operand(ebx), Immediate(Smi::FromInt(JSRegExp::IRREGEXP))); |
| 2226 | __ j(not_equal, &runtime); |
| 2227 | |
| 2228 | // ecx: RegExp data (FixedArray) |
| 2229 | // Check that the number of captures fit in the static offsets vector buffer. |
| 2230 | __ mov(edx, FieldOperand(ecx, JSRegExp::kIrregexpCaptureCountOffset)); |
| 2231 | // Calculate number of capture registers (number_of_captures + 1) * 2. This |
| 2232 | // uses the asumption that smis are 2 * their untagged value. |
| 2233 | STATIC_ASSERT(kSmiTag == 0); |
| 2234 | STATIC_ASSERT(kSmiTagSize + kSmiShiftSize == 1); |
| 2235 | __ add(Operand(edx), Immediate(2)); // edx was a smi. |
| 2236 | // Check that the static offsets vector buffer is large enough. |
| 2237 | __ cmp(edx, OffsetsVector::kStaticOffsetsVectorSize); |
| 2238 | __ j(above, &runtime); |
| 2239 | |
| 2240 | // ecx: RegExp data (FixedArray) |
| 2241 | // edx: Number of capture registers |
| 2242 | // Check that the second argument is a string. |
| 2243 | __ mov(eax, Operand(esp, kSubjectOffset)); |
| 2244 | __ test(eax, Immediate(kSmiTagMask)); |
| 2245 | __ j(zero, &runtime); |
| 2246 | Condition is_string = masm->IsObjectStringType(eax, ebx, ebx); |
| 2247 | __ j(NegateCondition(is_string), &runtime); |
| 2248 | // Get the length of the string to ebx. |
| 2249 | __ mov(ebx, FieldOperand(eax, String::kLengthOffset)); |
| 2250 | |
| 2251 | // ebx: Length of subject string as a smi |
| 2252 | // ecx: RegExp data (FixedArray) |
| 2253 | // edx: Number of capture registers |
| 2254 | // Check that the third argument is a positive smi less than the subject |
| 2255 | // string length. A negative value will be greater (unsigned comparison). |
| 2256 | __ mov(eax, Operand(esp, kPreviousIndexOffset)); |
| 2257 | __ test(eax, Immediate(kSmiTagMask)); |
| 2258 | __ j(not_zero, &runtime); |
| 2259 | __ cmp(eax, Operand(ebx)); |
| 2260 | __ j(above_equal, &runtime); |
| 2261 | |
| 2262 | // ecx: RegExp data (FixedArray) |
| 2263 | // edx: Number of capture registers |
| 2264 | // Check that the fourth object is a JSArray object. |
| 2265 | __ mov(eax, Operand(esp, kLastMatchInfoOffset)); |
| 2266 | __ test(eax, Immediate(kSmiTagMask)); |
| 2267 | __ j(zero, &runtime); |
| 2268 | __ CmpObjectType(eax, JS_ARRAY_TYPE, ebx); |
| 2269 | __ j(not_equal, &runtime); |
| 2270 | // Check that the JSArray is in fast case. |
| 2271 | __ mov(ebx, FieldOperand(eax, JSArray::kElementsOffset)); |
| 2272 | __ mov(eax, FieldOperand(ebx, HeapObject::kMapOffset)); |
| 2273 | __ cmp(eax, Factory::fixed_array_map()); |
| 2274 | __ j(not_equal, &runtime); |
| 2275 | // Check that the last match info has space for the capture registers and the |
| 2276 | // additional information. |
| 2277 | __ mov(eax, FieldOperand(ebx, FixedArray::kLengthOffset)); |
| 2278 | __ SmiUntag(eax); |
| 2279 | __ add(Operand(edx), Immediate(RegExpImpl::kLastMatchOverhead)); |
| 2280 | __ cmp(edx, Operand(eax)); |
| 2281 | __ j(greater, &runtime); |
| 2282 | |
| 2283 | // ecx: RegExp data (FixedArray) |
| 2284 | // Check the representation and encoding of the subject string. |
| 2285 | Label seq_ascii_string, seq_two_byte_string, check_code; |
| 2286 | __ mov(eax, Operand(esp, kSubjectOffset)); |
| 2287 | __ mov(ebx, FieldOperand(eax, HeapObject::kMapOffset)); |
| 2288 | __ movzx_b(ebx, FieldOperand(ebx, Map::kInstanceTypeOffset)); |
| 2289 | // First check for flat two byte string. |
| 2290 | __ and_(ebx, |
| 2291 | kIsNotStringMask | kStringRepresentationMask | kStringEncodingMask); |
| 2292 | STATIC_ASSERT((kStringTag | kSeqStringTag | kTwoByteStringTag) == 0); |
| 2293 | __ j(zero, &seq_two_byte_string); |
| 2294 | // Any other flat string must be a flat ascii string. |
| 2295 | __ test(Operand(ebx), |
| 2296 | Immediate(kIsNotStringMask | kStringRepresentationMask)); |
| 2297 | __ j(zero, &seq_ascii_string); |
| 2298 | |
| 2299 | // Check for flat cons string. |
| 2300 | // A flat cons string is a cons string where the second part is the empty |
| 2301 | // string. In that case the subject string is just the first part of the cons |
| 2302 | // string. Also in this case the first part of the cons string is known to be |
| 2303 | // a sequential string or an external string. |
| 2304 | STATIC_ASSERT(kExternalStringTag != 0); |
| 2305 | STATIC_ASSERT((kConsStringTag & kExternalStringTag) == 0); |
| 2306 | __ test(Operand(ebx), |
| 2307 | Immediate(kIsNotStringMask | kExternalStringTag)); |
| 2308 | __ j(not_zero, &runtime); |
| 2309 | // String is a cons string. |
| 2310 | __ mov(edx, FieldOperand(eax, ConsString::kSecondOffset)); |
| 2311 | __ cmp(Operand(edx), Factory::empty_string()); |
| 2312 | __ j(not_equal, &runtime); |
| 2313 | __ mov(eax, FieldOperand(eax, ConsString::kFirstOffset)); |
| 2314 | __ mov(ebx, FieldOperand(eax, HeapObject::kMapOffset)); |
| 2315 | // String is a cons string with empty second part. |
| 2316 | // eax: first part of cons string. |
| 2317 | // ebx: map of first part of cons string. |
| 2318 | // Is first part a flat two byte string? |
| 2319 | __ test_b(FieldOperand(ebx, Map::kInstanceTypeOffset), |
| 2320 | kStringRepresentationMask | kStringEncodingMask); |
| 2321 | STATIC_ASSERT((kSeqStringTag | kTwoByteStringTag) == 0); |
| 2322 | __ j(zero, &seq_two_byte_string); |
| 2323 | // Any other flat string must be ascii. |
| 2324 | __ test_b(FieldOperand(ebx, Map::kInstanceTypeOffset), |
| 2325 | kStringRepresentationMask); |
| 2326 | __ j(not_zero, &runtime); |
| 2327 | |
| 2328 | __ bind(&seq_ascii_string); |
| 2329 | // eax: subject string (flat ascii) |
| 2330 | // ecx: RegExp data (FixedArray) |
| 2331 | __ mov(edx, FieldOperand(ecx, JSRegExp::kDataAsciiCodeOffset)); |
| 2332 | __ Set(edi, Immediate(1)); // Type is ascii. |
| 2333 | __ jmp(&check_code); |
| 2334 | |
| 2335 | __ bind(&seq_two_byte_string); |
| 2336 | // eax: subject string (flat two byte) |
| 2337 | // ecx: RegExp data (FixedArray) |
| 2338 | __ mov(edx, FieldOperand(ecx, JSRegExp::kDataUC16CodeOffset)); |
| 2339 | __ Set(edi, Immediate(0)); // Type is two byte. |
| 2340 | |
| 2341 | __ bind(&check_code); |
| 2342 | // Check that the irregexp code has been generated for the actual string |
| 2343 | // encoding. If it has, the field contains a code object otherwise it contains |
| 2344 | // the hole. |
| 2345 | __ CmpObjectType(edx, CODE_TYPE, ebx); |
| 2346 | __ j(not_equal, &runtime); |
| 2347 | |
| 2348 | // eax: subject string |
| 2349 | // edx: code |
| 2350 | // edi: encoding of subject string (1 if ascii, 0 if two_byte); |
| 2351 | // Load used arguments before starting to push arguments for call to native |
| 2352 | // RegExp code to avoid handling changing stack height. |
| 2353 | __ mov(ebx, Operand(esp, kPreviousIndexOffset)); |
| 2354 | __ SmiUntag(ebx); // Previous index from smi. |
| 2355 | |
| 2356 | // eax: subject string |
| 2357 | // ebx: previous index |
| 2358 | // edx: code |
| 2359 | // edi: encoding of subject string (1 if ascii 0 if two_byte); |
| 2360 | // All checks done. Now push arguments for native regexp code. |
| 2361 | __ IncrementCounter(&Counters::regexp_entry_native, 1); |
| 2362 | |
| 2363 | static const int kRegExpExecuteArguments = 7; |
| 2364 | __ PrepareCallCFunction(kRegExpExecuteArguments, ecx); |
| 2365 | |
| 2366 | // Argument 7: Indicate that this is a direct call from JavaScript. |
| 2367 | __ mov(Operand(esp, 6 * kPointerSize), Immediate(1)); |
| 2368 | |
| 2369 | // Argument 6: Start (high end) of backtracking stack memory area. |
| 2370 | __ mov(ecx, Operand::StaticVariable(address_of_regexp_stack_memory_address)); |
| 2371 | __ add(ecx, Operand::StaticVariable(address_of_regexp_stack_memory_size)); |
| 2372 | __ mov(Operand(esp, 5 * kPointerSize), ecx); |
| 2373 | |
| 2374 | // Argument 5: static offsets vector buffer. |
| 2375 | __ mov(Operand(esp, 4 * kPointerSize), |
| 2376 | Immediate(ExternalReference::address_of_static_offsets_vector())); |
| 2377 | |
| 2378 | // Argument 4: End of string data |
| 2379 | // Argument 3: Start of string data |
| 2380 | Label setup_two_byte, setup_rest; |
| 2381 | __ test(edi, Operand(edi)); |
| 2382 | __ mov(edi, FieldOperand(eax, String::kLengthOffset)); |
| 2383 | __ j(zero, &setup_two_byte); |
| 2384 | __ SmiUntag(edi); |
| 2385 | __ lea(ecx, FieldOperand(eax, edi, times_1, SeqAsciiString::kHeaderSize)); |
| 2386 | __ mov(Operand(esp, 3 * kPointerSize), ecx); // Argument 4. |
| 2387 | __ lea(ecx, FieldOperand(eax, ebx, times_1, SeqAsciiString::kHeaderSize)); |
| 2388 | __ mov(Operand(esp, 2 * kPointerSize), ecx); // Argument 3. |
| 2389 | __ jmp(&setup_rest); |
| 2390 | |
| 2391 | __ bind(&setup_two_byte); |
| 2392 | STATIC_ASSERT(kSmiTag == 0); |
| 2393 | STATIC_ASSERT(kSmiTagSize == 1); // edi is smi (powered by 2). |
| 2394 | __ lea(ecx, FieldOperand(eax, edi, times_1, SeqTwoByteString::kHeaderSize)); |
| 2395 | __ mov(Operand(esp, 3 * kPointerSize), ecx); // Argument 4. |
| 2396 | __ lea(ecx, FieldOperand(eax, ebx, times_2, SeqTwoByteString::kHeaderSize)); |
| 2397 | __ mov(Operand(esp, 2 * kPointerSize), ecx); // Argument 3. |
| 2398 | |
| 2399 | __ bind(&setup_rest); |
| 2400 | |
| 2401 | // Argument 2: Previous index. |
| 2402 | __ mov(Operand(esp, 1 * kPointerSize), ebx); |
| 2403 | |
| 2404 | // Argument 1: Subject string. |
| 2405 | __ mov(Operand(esp, 0 * kPointerSize), eax); |
| 2406 | |
| 2407 | // Locate the code entry and call it. |
| 2408 | __ add(Operand(edx), Immediate(Code::kHeaderSize - kHeapObjectTag)); |
| 2409 | __ CallCFunction(edx, kRegExpExecuteArguments); |
| 2410 | |
| 2411 | // Check the result. |
| 2412 | Label success; |
| 2413 | __ cmp(eax, NativeRegExpMacroAssembler::SUCCESS); |
| 2414 | __ j(equal, &success, taken); |
| 2415 | Label failure; |
| 2416 | __ cmp(eax, NativeRegExpMacroAssembler::FAILURE); |
| 2417 | __ j(equal, &failure, taken); |
| 2418 | __ cmp(eax, NativeRegExpMacroAssembler::EXCEPTION); |
| 2419 | // If not exception it can only be retry. Handle that in the runtime system. |
| 2420 | __ j(not_equal, &runtime); |
| 2421 | // Result must now be exception. If there is no pending exception already a |
| 2422 | // stack overflow (on the backtrack stack) was detected in RegExp code but |
| 2423 | // haven't created the exception yet. Handle that in the runtime system. |
| 2424 | // TODO(592): Rerunning the RegExp to get the stack overflow exception. |
| 2425 | ExternalReference pending_exception(Top::k_pending_exception_address); |
| 2426 | __ mov(eax, |
| 2427 | Operand::StaticVariable(ExternalReference::the_hole_value_location())); |
| 2428 | __ cmp(eax, Operand::StaticVariable(pending_exception)); |
| 2429 | __ j(equal, &runtime); |
| 2430 | __ bind(&failure); |
| 2431 | // For failure and exception return null. |
| 2432 | __ mov(Operand(eax), Factory::null_value()); |
| 2433 | __ ret(4 * kPointerSize); |
| 2434 | |
| 2435 | // Load RegExp data. |
| 2436 | __ bind(&success); |
| 2437 | __ mov(eax, Operand(esp, kJSRegExpOffset)); |
| 2438 | __ mov(ecx, FieldOperand(eax, JSRegExp::kDataOffset)); |
| 2439 | __ mov(edx, FieldOperand(ecx, JSRegExp::kIrregexpCaptureCountOffset)); |
| 2440 | // Calculate number of capture registers (number_of_captures + 1) * 2. |
| 2441 | STATIC_ASSERT(kSmiTag == 0); |
| 2442 | STATIC_ASSERT(kSmiTagSize + kSmiShiftSize == 1); |
| 2443 | __ add(Operand(edx), Immediate(2)); // edx was a smi. |
| 2444 | |
| 2445 | // edx: Number of capture registers |
| 2446 | // Load last_match_info which is still known to be a fast case JSArray. |
| 2447 | __ mov(eax, Operand(esp, kLastMatchInfoOffset)); |
| 2448 | __ mov(ebx, FieldOperand(eax, JSArray::kElementsOffset)); |
| 2449 | |
| 2450 | // ebx: last_match_info backing store (FixedArray) |
| 2451 | // edx: number of capture registers |
| 2452 | // Store the capture count. |
| 2453 | __ SmiTag(edx); // Number of capture registers to smi. |
| 2454 | __ mov(FieldOperand(ebx, RegExpImpl::kLastCaptureCountOffset), edx); |
| 2455 | __ SmiUntag(edx); // Number of capture registers back from smi. |
| 2456 | // Store last subject and last input. |
| 2457 | __ mov(eax, Operand(esp, kSubjectOffset)); |
| 2458 | __ mov(FieldOperand(ebx, RegExpImpl::kLastSubjectOffset), eax); |
| 2459 | __ mov(ecx, ebx); |
| 2460 | __ RecordWrite(ecx, RegExpImpl::kLastSubjectOffset, eax, edi); |
| 2461 | __ mov(eax, Operand(esp, kSubjectOffset)); |
| 2462 | __ mov(FieldOperand(ebx, RegExpImpl::kLastInputOffset), eax); |
| 2463 | __ mov(ecx, ebx); |
| 2464 | __ RecordWrite(ecx, RegExpImpl::kLastInputOffset, eax, edi); |
| 2465 | |
| 2466 | // Get the static offsets vector filled by the native regexp code. |
| 2467 | ExternalReference address_of_static_offsets_vector = |
| 2468 | ExternalReference::address_of_static_offsets_vector(); |
| 2469 | __ mov(ecx, Immediate(address_of_static_offsets_vector)); |
| 2470 | |
| 2471 | // ebx: last_match_info backing store (FixedArray) |
| 2472 | // ecx: offsets vector |
| 2473 | // edx: number of capture registers |
| 2474 | Label next_capture, done; |
| 2475 | // Capture register counter starts from number of capture registers and |
| 2476 | // counts down until wraping after zero. |
| 2477 | __ bind(&next_capture); |
| 2478 | __ sub(Operand(edx), Immediate(1)); |
| 2479 | __ j(negative, &done); |
| 2480 | // Read the value from the static offsets vector buffer. |
| 2481 | __ mov(edi, Operand(ecx, edx, times_int_size, 0)); |
| 2482 | __ SmiTag(edi); |
| 2483 | // Store the smi value in the last match info. |
| 2484 | __ mov(FieldOperand(ebx, |
| 2485 | edx, |
| 2486 | times_pointer_size, |
| 2487 | RegExpImpl::kFirstCaptureOffset), |
| 2488 | edi); |
| 2489 | __ jmp(&next_capture); |
| 2490 | __ bind(&done); |
| 2491 | |
| 2492 | // Return last match info. |
| 2493 | __ mov(eax, Operand(esp, kLastMatchInfoOffset)); |
| 2494 | __ ret(4 * kPointerSize); |
| 2495 | |
| 2496 | // Do the runtime call to execute the regexp. |
| 2497 | __ bind(&runtime); |
| 2498 | __ TailCallRuntime(Runtime::kRegExpExec, 4, 1); |
| 2499 | #endif // V8_INTERPRETED_REGEXP |
| 2500 | } |
| 2501 | |
| 2502 | |
| 2503 | void NumberToStringStub::GenerateLookupNumberStringCache(MacroAssembler* masm, |
| 2504 | Register object, |
| 2505 | Register result, |
| 2506 | Register scratch1, |
| 2507 | Register scratch2, |
| 2508 | bool object_is_smi, |
| 2509 | Label* not_found) { |
| 2510 | // Use of registers. Register result is used as a temporary. |
| 2511 | Register number_string_cache = result; |
| 2512 | Register mask = scratch1; |
| 2513 | Register scratch = scratch2; |
| 2514 | |
| 2515 | // Load the number string cache. |
| 2516 | ExternalReference roots_address = ExternalReference::roots_address(); |
| 2517 | __ mov(scratch, Immediate(Heap::kNumberStringCacheRootIndex)); |
| 2518 | __ mov(number_string_cache, |
| 2519 | Operand::StaticArray(scratch, times_pointer_size, roots_address)); |
| 2520 | // Make the hash mask from the length of the number string cache. It |
| 2521 | // contains two elements (number and string) for each cache entry. |
| 2522 | __ mov(mask, FieldOperand(number_string_cache, FixedArray::kLengthOffset)); |
| 2523 | __ shr(mask, kSmiTagSize + 1); // Untag length and divide it by two. |
| 2524 | __ sub(Operand(mask), Immediate(1)); // Make mask. |
| 2525 | |
| 2526 | // Calculate the entry in the number string cache. The hash value in the |
| 2527 | // number string cache for smis is just the smi value, and the hash for |
| 2528 | // doubles is the xor of the upper and lower words. See |
| 2529 | // Heap::GetNumberStringCache. |
| 2530 | Label smi_hash_calculated; |
| 2531 | Label load_result_from_cache; |
| 2532 | if (object_is_smi) { |
| 2533 | __ mov(scratch, object); |
| 2534 | __ SmiUntag(scratch); |
| 2535 | } else { |
| 2536 | Label not_smi, hash_calculated; |
| 2537 | STATIC_ASSERT(kSmiTag == 0); |
| 2538 | __ test(object, Immediate(kSmiTagMask)); |
| 2539 | __ j(not_zero, ¬_smi); |
| 2540 | __ mov(scratch, object); |
| 2541 | __ SmiUntag(scratch); |
| 2542 | __ jmp(&smi_hash_calculated); |
| 2543 | __ bind(¬_smi); |
| 2544 | __ cmp(FieldOperand(object, HeapObject::kMapOffset), |
| 2545 | Factory::heap_number_map()); |
| 2546 | __ j(not_equal, not_found); |
| 2547 | STATIC_ASSERT(8 == kDoubleSize); |
| 2548 | __ mov(scratch, FieldOperand(object, HeapNumber::kValueOffset)); |
| 2549 | __ xor_(scratch, FieldOperand(object, HeapNumber::kValueOffset + 4)); |
| 2550 | // Object is heap number and hash is now in scratch. Calculate cache index. |
| 2551 | __ and_(scratch, Operand(mask)); |
| 2552 | Register index = scratch; |
| 2553 | Register probe = mask; |
| 2554 | __ mov(probe, |
| 2555 | FieldOperand(number_string_cache, |
| 2556 | index, |
| 2557 | times_twice_pointer_size, |
| 2558 | FixedArray::kHeaderSize)); |
| 2559 | __ test(probe, Immediate(kSmiTagMask)); |
| 2560 | __ j(zero, not_found); |
| 2561 | if (CpuFeatures::IsSupported(SSE2)) { |
| 2562 | CpuFeatures::Scope fscope(SSE2); |
| 2563 | __ movdbl(xmm0, FieldOperand(object, HeapNumber::kValueOffset)); |
| 2564 | __ movdbl(xmm1, FieldOperand(probe, HeapNumber::kValueOffset)); |
| 2565 | __ ucomisd(xmm0, xmm1); |
| 2566 | } else { |
| 2567 | __ fld_d(FieldOperand(object, HeapNumber::kValueOffset)); |
| 2568 | __ fld_d(FieldOperand(probe, HeapNumber::kValueOffset)); |
| 2569 | __ FCmp(); |
| 2570 | } |
| 2571 | __ j(parity_even, not_found); // Bail out if NaN is involved. |
| 2572 | __ j(not_equal, not_found); // The cache did not contain this value. |
| 2573 | __ jmp(&load_result_from_cache); |
| 2574 | } |
| 2575 | |
| 2576 | __ bind(&smi_hash_calculated); |
| 2577 | // Object is smi and hash is now in scratch. Calculate cache index. |
| 2578 | __ and_(scratch, Operand(mask)); |
| 2579 | Register index = scratch; |
| 2580 | // Check if the entry is the smi we are looking for. |
| 2581 | __ cmp(object, |
| 2582 | FieldOperand(number_string_cache, |
| 2583 | index, |
| 2584 | times_twice_pointer_size, |
| 2585 | FixedArray::kHeaderSize)); |
| 2586 | __ j(not_equal, not_found); |
| 2587 | |
| 2588 | // Get the result from the cache. |
| 2589 | __ bind(&load_result_from_cache); |
| 2590 | __ mov(result, |
| 2591 | FieldOperand(number_string_cache, |
| 2592 | index, |
| 2593 | times_twice_pointer_size, |
| 2594 | FixedArray::kHeaderSize + kPointerSize)); |
| 2595 | __ IncrementCounter(&Counters::number_to_string_native, 1); |
| 2596 | } |
| 2597 | |
| 2598 | |
| 2599 | void NumberToStringStub::Generate(MacroAssembler* masm) { |
| 2600 | Label runtime; |
| 2601 | |
| 2602 | __ mov(ebx, Operand(esp, kPointerSize)); |
| 2603 | |
| 2604 | // Generate code to lookup number in the number string cache. |
| 2605 | GenerateLookupNumberStringCache(masm, ebx, eax, ecx, edx, false, &runtime); |
| 2606 | __ ret(1 * kPointerSize); |
| 2607 | |
| 2608 | __ bind(&runtime); |
| 2609 | // Handle number to string in the runtime system if not found in the cache. |
| 2610 | __ TailCallRuntime(Runtime::kNumberToStringSkipCache, 1, 1); |
| 2611 | } |
| 2612 | |
| 2613 | |
| 2614 | static int NegativeComparisonResult(Condition cc) { |
| 2615 | ASSERT(cc != equal); |
| 2616 | ASSERT((cc == less) || (cc == less_equal) |
| 2617 | || (cc == greater) || (cc == greater_equal)); |
| 2618 | return (cc == greater || cc == greater_equal) ? LESS : GREATER; |
| 2619 | } |
| 2620 | |
| 2621 | void CompareStub::Generate(MacroAssembler* masm) { |
| 2622 | ASSERT(lhs_.is(no_reg) && rhs_.is(no_reg)); |
| 2623 | |
| 2624 | Label check_unequal_objects, done; |
| 2625 | |
| 2626 | // NOTICE! This code is only reached after a smi-fast-case check, so |
| 2627 | // it is certain that at least one operand isn't a smi. |
| 2628 | |
| 2629 | // Identical objects can be compared fast, but there are some tricky cases |
| 2630 | // for NaN and undefined. |
| 2631 | { |
| 2632 | Label not_identical; |
| 2633 | __ cmp(eax, Operand(edx)); |
| 2634 | __ j(not_equal, ¬_identical); |
| 2635 | |
| 2636 | if (cc_ != equal) { |
| 2637 | // Check for undefined. undefined OP undefined is false even though |
| 2638 | // undefined == undefined. |
| 2639 | Label check_for_nan; |
| 2640 | __ cmp(edx, Factory::undefined_value()); |
| 2641 | __ j(not_equal, &check_for_nan); |
| 2642 | __ Set(eax, Immediate(Smi::FromInt(NegativeComparisonResult(cc_)))); |
| 2643 | __ ret(0); |
| 2644 | __ bind(&check_for_nan); |
| 2645 | } |
| 2646 | |
| 2647 | // Test for NaN. Sadly, we can't just compare to Factory::nan_value(), |
| 2648 | // so we do the second best thing - test it ourselves. |
| 2649 | // Note: if cc_ != equal, never_nan_nan_ is not used. |
| 2650 | if (never_nan_nan_ && (cc_ == equal)) { |
| 2651 | __ Set(eax, Immediate(Smi::FromInt(EQUAL))); |
| 2652 | __ ret(0); |
| 2653 | } else { |
| 2654 | Label heap_number; |
| 2655 | __ cmp(FieldOperand(edx, HeapObject::kMapOffset), |
| 2656 | Immediate(Factory::heap_number_map())); |
| 2657 | __ j(equal, &heap_number); |
| 2658 | if (cc_ != equal) { |
| 2659 | // Call runtime on identical JSObjects. Otherwise return equal. |
| 2660 | __ CmpObjectType(eax, FIRST_JS_OBJECT_TYPE, ecx); |
| 2661 | __ j(above_equal, ¬_identical); |
| 2662 | } |
| 2663 | __ Set(eax, Immediate(Smi::FromInt(EQUAL))); |
| 2664 | __ ret(0); |
| 2665 | |
| 2666 | __ bind(&heap_number); |
| 2667 | // It is a heap number, so return non-equal if it's NaN and equal if |
| 2668 | // it's not NaN. |
| 2669 | // The representation of NaN values has all exponent bits (52..62) set, |
| 2670 | // and not all mantissa bits (0..51) clear. |
| 2671 | // We only accept QNaNs, which have bit 51 set. |
| 2672 | // Read top bits of double representation (second word of value). |
| 2673 | |
| 2674 | // Value is a QNaN if value & kQuietNaNMask == kQuietNaNMask, i.e., |
| 2675 | // all bits in the mask are set. We only need to check the word |
| 2676 | // that contains the exponent and high bit of the mantissa. |
| 2677 | STATIC_ASSERT(((kQuietNaNHighBitsMask << 1) & 0x80000000u) != 0); |
| 2678 | __ mov(edx, FieldOperand(edx, HeapNumber::kExponentOffset)); |
| 2679 | __ xor_(eax, Operand(eax)); |
| 2680 | // Shift value and mask so kQuietNaNHighBitsMask applies to topmost |
| 2681 | // bits. |
| 2682 | __ add(edx, Operand(edx)); |
| 2683 | __ cmp(edx, kQuietNaNHighBitsMask << 1); |
| 2684 | if (cc_ == equal) { |
| 2685 | STATIC_ASSERT(EQUAL != 1); |
| 2686 | __ setcc(above_equal, eax); |
| 2687 | __ ret(0); |
| 2688 | } else { |
| 2689 | Label nan; |
| 2690 | __ j(above_equal, &nan); |
| 2691 | __ Set(eax, Immediate(Smi::FromInt(EQUAL))); |
| 2692 | __ ret(0); |
| 2693 | __ bind(&nan); |
| 2694 | __ Set(eax, Immediate(Smi::FromInt(NegativeComparisonResult(cc_)))); |
| 2695 | __ ret(0); |
| 2696 | } |
| 2697 | } |
| 2698 | |
| 2699 | __ bind(¬_identical); |
| 2700 | } |
| 2701 | |
| 2702 | // Strict equality can quickly decide whether objects are equal. |
| 2703 | // Non-strict object equality is slower, so it is handled later in the stub. |
| 2704 | if (cc_ == equal && strict_) { |
| 2705 | Label slow; // Fallthrough label. |
| 2706 | Label not_smis; |
| 2707 | // If we're doing a strict equality comparison, we don't have to do |
| 2708 | // type conversion, so we generate code to do fast comparison for objects |
| 2709 | // and oddballs. Non-smi numbers and strings still go through the usual |
| 2710 | // slow-case code. |
| 2711 | // If either is a Smi (we know that not both are), then they can only |
| 2712 | // be equal if the other is a HeapNumber. If so, use the slow case. |
| 2713 | STATIC_ASSERT(kSmiTag == 0); |
| 2714 | ASSERT_EQ(0, Smi::FromInt(0)); |
| 2715 | __ mov(ecx, Immediate(kSmiTagMask)); |
| 2716 | __ and_(ecx, Operand(eax)); |
| 2717 | __ test(ecx, Operand(edx)); |
| 2718 | __ j(not_zero, ¬_smis); |
| 2719 | // One operand is a smi. |
| 2720 | |
| 2721 | // Check whether the non-smi is a heap number. |
| 2722 | STATIC_ASSERT(kSmiTagMask == 1); |
| 2723 | // ecx still holds eax & kSmiTag, which is either zero or one. |
| 2724 | __ sub(Operand(ecx), Immediate(0x01)); |
| 2725 | __ mov(ebx, edx); |
| 2726 | __ xor_(ebx, Operand(eax)); |
| 2727 | __ and_(ebx, Operand(ecx)); // ebx holds either 0 or eax ^ edx. |
| 2728 | __ xor_(ebx, Operand(eax)); |
| 2729 | // if eax was smi, ebx is now edx, else eax. |
| 2730 | |
| 2731 | // Check if the non-smi operand is a heap number. |
| 2732 | __ cmp(FieldOperand(ebx, HeapObject::kMapOffset), |
| 2733 | Immediate(Factory::heap_number_map())); |
| 2734 | // If heap number, handle it in the slow case. |
| 2735 | __ j(equal, &slow); |
| 2736 | // Return non-equal (ebx is not zero) |
| 2737 | __ mov(eax, ebx); |
| 2738 | __ ret(0); |
| 2739 | |
| 2740 | __ bind(¬_smis); |
| 2741 | // If either operand is a JSObject or an oddball value, then they are not |
| 2742 | // equal since their pointers are different |
| 2743 | // There is no test for undetectability in strict equality. |
| 2744 | |
| 2745 | // Get the type of the first operand. |
| 2746 | // If the first object is a JS object, we have done pointer comparison. |
| 2747 | Label first_non_object; |
| 2748 | STATIC_ASSERT(LAST_TYPE == JS_FUNCTION_TYPE); |
| 2749 | __ CmpObjectType(eax, FIRST_JS_OBJECT_TYPE, ecx); |
| 2750 | __ j(below, &first_non_object); |
| 2751 | |
| 2752 | // Return non-zero (eax is not zero) |
| 2753 | Label return_not_equal; |
| 2754 | STATIC_ASSERT(kHeapObjectTag != 0); |
| 2755 | __ bind(&return_not_equal); |
| 2756 | __ ret(0); |
| 2757 | |
| 2758 | __ bind(&first_non_object); |
| 2759 | // Check for oddballs: true, false, null, undefined. |
| 2760 | __ CmpInstanceType(ecx, ODDBALL_TYPE); |
| 2761 | __ j(equal, &return_not_equal); |
| 2762 | |
| 2763 | __ CmpObjectType(edx, FIRST_JS_OBJECT_TYPE, ecx); |
| 2764 | __ j(above_equal, &return_not_equal); |
| 2765 | |
| 2766 | // Check for oddballs: true, false, null, undefined. |
| 2767 | __ CmpInstanceType(ecx, ODDBALL_TYPE); |
| 2768 | __ j(equal, &return_not_equal); |
| 2769 | |
| 2770 | // Fall through to the general case. |
| 2771 | __ bind(&slow); |
| 2772 | } |
| 2773 | |
| 2774 | // Generate the number comparison code. |
| 2775 | if (include_number_compare_) { |
| 2776 | Label non_number_comparison; |
| 2777 | Label unordered; |
| 2778 | if (CpuFeatures::IsSupported(SSE2)) { |
| 2779 | CpuFeatures::Scope use_sse2(SSE2); |
| 2780 | CpuFeatures::Scope use_cmov(CMOV); |
| 2781 | |
| 2782 | FloatingPointHelper::LoadSSE2Operands(masm, &non_number_comparison); |
| 2783 | __ ucomisd(xmm0, xmm1); |
| 2784 | |
| 2785 | // Don't base result on EFLAGS when a NaN is involved. |
| 2786 | __ j(parity_even, &unordered, not_taken); |
| 2787 | // Return a result of -1, 0, or 1, based on EFLAGS. |
| 2788 | __ mov(eax, 0); // equal |
| 2789 | __ mov(ecx, Immediate(Smi::FromInt(1))); |
| 2790 | __ cmov(above, eax, Operand(ecx)); |
| 2791 | __ mov(ecx, Immediate(Smi::FromInt(-1))); |
| 2792 | __ cmov(below, eax, Operand(ecx)); |
| 2793 | __ ret(0); |
| 2794 | } else { |
| 2795 | FloatingPointHelper::CheckFloatOperands( |
| 2796 | masm, &non_number_comparison, ebx); |
| 2797 | FloatingPointHelper::LoadFloatOperand(masm, eax); |
| 2798 | FloatingPointHelper::LoadFloatOperand(masm, edx); |
| 2799 | __ FCmp(); |
| 2800 | |
| 2801 | // Don't base result on EFLAGS when a NaN is involved. |
| 2802 | __ j(parity_even, &unordered, not_taken); |
| 2803 | |
| 2804 | Label below_label, above_label; |
| 2805 | // Return a result of -1, 0, or 1, based on EFLAGS. |
| 2806 | __ j(below, &below_label, not_taken); |
| 2807 | __ j(above, &above_label, not_taken); |
| 2808 | |
| 2809 | __ xor_(eax, Operand(eax)); |
| 2810 | __ ret(0); |
| 2811 | |
| 2812 | __ bind(&below_label); |
| 2813 | __ mov(eax, Immediate(Smi::FromInt(-1))); |
| 2814 | __ ret(0); |
| 2815 | |
| 2816 | __ bind(&above_label); |
| 2817 | __ mov(eax, Immediate(Smi::FromInt(1))); |
| 2818 | __ ret(0); |
| 2819 | } |
| 2820 | |
| 2821 | // If one of the numbers was NaN, then the result is always false. |
| 2822 | // The cc is never not-equal. |
| 2823 | __ bind(&unordered); |
| 2824 | ASSERT(cc_ != not_equal); |
| 2825 | if (cc_ == less || cc_ == less_equal) { |
| 2826 | __ mov(eax, Immediate(Smi::FromInt(1))); |
| 2827 | } else { |
| 2828 | __ mov(eax, Immediate(Smi::FromInt(-1))); |
| 2829 | } |
| 2830 | __ ret(0); |
| 2831 | |
| 2832 | // The number comparison code did not provide a valid result. |
| 2833 | __ bind(&non_number_comparison); |
| 2834 | } |
| 2835 | |
| 2836 | // Fast negative check for symbol-to-symbol equality. |
| 2837 | Label check_for_strings; |
| 2838 | if (cc_ == equal) { |
| 2839 | BranchIfNonSymbol(masm, &check_for_strings, eax, ecx); |
| 2840 | BranchIfNonSymbol(masm, &check_for_strings, edx, ecx); |
| 2841 | |
| 2842 | // We've already checked for object identity, so if both operands |
| 2843 | // are symbols they aren't equal. Register eax already holds a |
| 2844 | // non-zero value, which indicates not equal, so just return. |
| 2845 | __ ret(0); |
| 2846 | } |
| 2847 | |
| 2848 | __ bind(&check_for_strings); |
| 2849 | |
| 2850 | __ JumpIfNotBothSequentialAsciiStrings(edx, eax, ecx, ebx, |
| 2851 | &check_unequal_objects); |
| 2852 | |
| 2853 | // Inline comparison of ascii strings. |
| 2854 | StringCompareStub::GenerateCompareFlatAsciiStrings(masm, |
| 2855 | edx, |
| 2856 | eax, |
| 2857 | ecx, |
| 2858 | ebx, |
| 2859 | edi); |
| 2860 | #ifdef DEBUG |
| 2861 | __ Abort("Unexpected fall-through from string comparison"); |
| 2862 | #endif |
| 2863 | |
| 2864 | __ bind(&check_unequal_objects); |
| 2865 | if (cc_ == equal && !strict_) { |
| 2866 | // Non-strict equality. Objects are unequal if |
| 2867 | // they are both JSObjects and not undetectable, |
| 2868 | // and their pointers are different. |
| 2869 | Label not_both_objects; |
| 2870 | Label return_unequal; |
| 2871 | // At most one is a smi, so we can test for smi by adding the two. |
| 2872 | // A smi plus a heap object has the low bit set, a heap object plus |
| 2873 | // a heap object has the low bit clear. |
| 2874 | STATIC_ASSERT(kSmiTag == 0); |
| 2875 | STATIC_ASSERT(kSmiTagMask == 1); |
| 2876 | __ lea(ecx, Operand(eax, edx, times_1, 0)); |
| 2877 | __ test(ecx, Immediate(kSmiTagMask)); |
| 2878 | __ j(not_zero, ¬_both_objects); |
| 2879 | __ CmpObjectType(eax, FIRST_JS_OBJECT_TYPE, ecx); |
| 2880 | __ j(below, ¬_both_objects); |
| 2881 | __ CmpObjectType(edx, FIRST_JS_OBJECT_TYPE, ebx); |
| 2882 | __ j(below, ¬_both_objects); |
| 2883 | // We do not bail out after this point. Both are JSObjects, and |
| 2884 | // they are equal if and only if both are undetectable. |
| 2885 | // The and of the undetectable flags is 1 if and only if they are equal. |
| 2886 | __ test_b(FieldOperand(ecx, Map::kBitFieldOffset), |
| 2887 | 1 << Map::kIsUndetectable); |
| 2888 | __ j(zero, &return_unequal); |
| 2889 | __ test_b(FieldOperand(ebx, Map::kBitFieldOffset), |
| 2890 | 1 << Map::kIsUndetectable); |
| 2891 | __ j(zero, &return_unequal); |
| 2892 | // The objects are both undetectable, so they both compare as the value |
| 2893 | // undefined, and are equal. |
| 2894 | __ Set(eax, Immediate(EQUAL)); |
| 2895 | __ bind(&return_unequal); |
| 2896 | // Return non-equal by returning the non-zero object pointer in eax, |
| 2897 | // or return equal if we fell through to here. |
| 2898 | __ ret(0); // rax, rdx were pushed |
| 2899 | __ bind(¬_both_objects); |
| 2900 | } |
| 2901 | |
| 2902 | // Push arguments below the return address. |
| 2903 | __ pop(ecx); |
| 2904 | __ push(edx); |
| 2905 | __ push(eax); |
| 2906 | |
| 2907 | // Figure out which native to call and setup the arguments. |
| 2908 | Builtins::JavaScript builtin; |
| 2909 | if (cc_ == equal) { |
| 2910 | builtin = strict_ ? Builtins::STRICT_EQUALS : Builtins::EQUALS; |
| 2911 | } else { |
| 2912 | builtin = Builtins::COMPARE; |
| 2913 | __ push(Immediate(Smi::FromInt(NegativeComparisonResult(cc_)))); |
| 2914 | } |
| 2915 | |
| 2916 | // Restore return address on the stack. |
| 2917 | __ push(ecx); |
| 2918 | |
| 2919 | // Call the native; it returns -1 (less), 0 (equal), or 1 (greater) |
| 2920 | // tagged as a small integer. |
| 2921 | __ InvokeBuiltin(builtin, JUMP_FUNCTION); |
| 2922 | } |
| 2923 | |
| 2924 | |
| 2925 | void CompareStub::BranchIfNonSymbol(MacroAssembler* masm, |
| 2926 | Label* label, |
| 2927 | Register object, |
| 2928 | Register scratch) { |
| 2929 | __ test(object, Immediate(kSmiTagMask)); |
| 2930 | __ j(zero, label); |
| 2931 | __ mov(scratch, FieldOperand(object, HeapObject::kMapOffset)); |
| 2932 | __ movzx_b(scratch, FieldOperand(scratch, Map::kInstanceTypeOffset)); |
| 2933 | __ and_(scratch, kIsSymbolMask | kIsNotStringMask); |
| 2934 | __ cmp(scratch, kSymbolTag | kStringTag); |
| 2935 | __ j(not_equal, label); |
| 2936 | } |
| 2937 | |
| 2938 | |
| 2939 | void StackCheckStub::Generate(MacroAssembler* masm) { |
| 2940 | // Because builtins always remove the receiver from the stack, we |
| 2941 | // have to fake one to avoid underflowing the stack. The receiver |
| 2942 | // must be inserted below the return address on the stack so we |
| 2943 | // temporarily store that in a register. |
| 2944 | __ pop(eax); |
| 2945 | __ push(Immediate(Smi::FromInt(0))); |
| 2946 | __ push(eax); |
| 2947 | |
| 2948 | // Do tail-call to runtime routine. |
| 2949 | __ TailCallRuntime(Runtime::kStackGuard, 1, 1); |
| 2950 | } |
| 2951 | |
| 2952 | |
| 2953 | void CallFunctionStub::Generate(MacroAssembler* masm) { |
| 2954 | Label slow; |
| 2955 | |
| 2956 | // If the receiver might be a value (string, number or boolean) check for this |
| 2957 | // and box it if it is. |
| 2958 | if (ReceiverMightBeValue()) { |
| 2959 | // Get the receiver from the stack. |
| 2960 | // +1 ~ return address |
| 2961 | Label receiver_is_value, receiver_is_js_object; |
| 2962 | __ mov(eax, Operand(esp, (argc_ + 1) * kPointerSize)); |
| 2963 | |
| 2964 | // Check if receiver is a smi (which is a number value). |
| 2965 | __ test(eax, Immediate(kSmiTagMask)); |
| 2966 | __ j(zero, &receiver_is_value, not_taken); |
| 2967 | |
| 2968 | // Check if the receiver is a valid JS object. |
| 2969 | __ CmpObjectType(eax, FIRST_JS_OBJECT_TYPE, edi); |
| 2970 | __ j(above_equal, &receiver_is_js_object); |
| 2971 | |
| 2972 | // Call the runtime to box the value. |
| 2973 | __ bind(&receiver_is_value); |
| 2974 | __ EnterInternalFrame(); |
| 2975 | __ push(eax); |
| 2976 | __ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION); |
| 2977 | __ LeaveInternalFrame(); |
| 2978 | __ mov(Operand(esp, (argc_ + 1) * kPointerSize), eax); |
| 2979 | |
| 2980 | __ bind(&receiver_is_js_object); |
| 2981 | } |
| 2982 | |
| 2983 | // Get the function to call from the stack. |
| 2984 | // +2 ~ receiver, return address |
| 2985 | __ mov(edi, Operand(esp, (argc_ + 2) * kPointerSize)); |
| 2986 | |
| 2987 | // Check that the function really is a JavaScript function. |
| 2988 | __ test(edi, Immediate(kSmiTagMask)); |
| 2989 | __ j(zero, &slow, not_taken); |
| 2990 | // Goto slow case if we do not have a function. |
| 2991 | __ CmpObjectType(edi, JS_FUNCTION_TYPE, ecx); |
| 2992 | __ j(not_equal, &slow, not_taken); |
| 2993 | |
| 2994 | // Fast-case: Just invoke the function. |
| 2995 | ParameterCount actual(argc_); |
| 2996 | __ InvokeFunction(edi, actual, JUMP_FUNCTION); |
| 2997 | |
| 2998 | // Slow-case: Non-function called. |
| 2999 | __ bind(&slow); |
| 3000 | // CALL_NON_FUNCTION expects the non-function callee as receiver (instead |
| 3001 | // of the original receiver from the call site). |
| 3002 | __ mov(Operand(esp, (argc_ + 1) * kPointerSize), edi); |
| 3003 | __ Set(eax, Immediate(argc_)); |
| 3004 | __ Set(ebx, Immediate(0)); |
| 3005 | __ GetBuiltinEntry(edx, Builtins::CALL_NON_FUNCTION); |
| 3006 | Handle<Code> adaptor(Builtins::builtin(Builtins::ArgumentsAdaptorTrampoline)); |
| 3007 | __ jmp(adaptor, RelocInfo::CODE_TARGET); |
| 3008 | } |
| 3009 | |
| 3010 | |
| 3011 | void CEntryStub::GenerateThrowTOS(MacroAssembler* masm) { |
| 3012 | // eax holds the exception. |
| 3013 | |
| 3014 | // Adjust this code if not the case. |
| 3015 | STATIC_ASSERT(StackHandlerConstants::kSize == 4 * kPointerSize); |
| 3016 | |
| 3017 | // Drop the sp to the top of the handler. |
| 3018 | ExternalReference handler_address(Top::k_handler_address); |
| 3019 | __ mov(esp, Operand::StaticVariable(handler_address)); |
| 3020 | |
| 3021 | // Restore next handler and frame pointer, discard handler state. |
| 3022 | STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0); |
| 3023 | __ pop(Operand::StaticVariable(handler_address)); |
| 3024 | STATIC_ASSERT(StackHandlerConstants::kFPOffset == 1 * kPointerSize); |
| 3025 | __ pop(ebp); |
| 3026 | __ pop(edx); // Remove state. |
| 3027 | |
| 3028 | // Before returning we restore the context from the frame pointer if |
| 3029 | // not NULL. The frame pointer is NULL in the exception handler of |
| 3030 | // a JS entry frame. |
| 3031 | __ xor_(esi, Operand(esi)); // Tentatively set context pointer to NULL. |
| 3032 | Label skip; |
| 3033 | __ cmp(ebp, 0); |
| 3034 | __ j(equal, &skip, not_taken); |
| 3035 | __ mov(esi, Operand(ebp, StandardFrameConstants::kContextOffset)); |
| 3036 | __ bind(&skip); |
| 3037 | |
| 3038 | STATIC_ASSERT(StackHandlerConstants::kPCOffset == 3 * kPointerSize); |
| 3039 | __ ret(0); |
| 3040 | } |
| 3041 | |
| 3042 | |
| 3043 | // If true, a Handle<T> passed by value is passed and returned by |
| 3044 | // using the location_ field directly. If false, it is passed and |
| 3045 | // returned as a pointer to a handle. |
| 3046 | #ifdef USING_BSD_ABI |
| 3047 | static const bool kPassHandlesDirectly = true; |
| 3048 | #else |
| 3049 | static const bool kPassHandlesDirectly = false; |
| 3050 | #endif |
| 3051 | |
| 3052 | |
| 3053 | void ApiGetterEntryStub::Generate(MacroAssembler* masm) { |
| 3054 | Label empty_handle; |
| 3055 | Label prologue; |
| 3056 | Label promote_scheduled_exception; |
| 3057 | __ EnterApiExitFrame(ExitFrame::MODE_NORMAL, kStackSpace, kArgc); |
| 3058 | STATIC_ASSERT(kArgc == 4); |
| 3059 | if (kPassHandlesDirectly) { |
| 3060 | // When handles as passed directly we don't have to allocate extra |
| 3061 | // space for and pass an out parameter. |
| 3062 | __ mov(Operand(esp, 0 * kPointerSize), ebx); // name. |
| 3063 | __ mov(Operand(esp, 1 * kPointerSize), eax); // arguments pointer. |
| 3064 | } else { |
| 3065 | // The function expects three arguments to be passed but we allocate |
| 3066 | // four to get space for the output cell. The argument slots are filled |
| 3067 | // as follows: |
| 3068 | // |
| 3069 | // 3: output cell |
| 3070 | // 2: arguments pointer |
| 3071 | // 1: name |
| 3072 | // 0: pointer to the output cell |
| 3073 | // |
| 3074 | // Note that this is one more "argument" than the function expects |
| 3075 | // so the out cell will have to be popped explicitly after returning |
| 3076 | // from the function. |
| 3077 | __ mov(Operand(esp, 1 * kPointerSize), ebx); // name. |
| 3078 | __ mov(Operand(esp, 2 * kPointerSize), eax); // arguments pointer. |
| 3079 | __ mov(ebx, esp); |
| 3080 | __ add(Operand(ebx), Immediate(3 * kPointerSize)); |
| 3081 | __ mov(Operand(esp, 0 * kPointerSize), ebx); // output |
| 3082 | __ mov(Operand(esp, 3 * kPointerSize), Immediate(0)); // out cell. |
| 3083 | } |
| 3084 | // Call the api function! |
| 3085 | __ call(fun()->address(), RelocInfo::RUNTIME_ENTRY); |
| 3086 | // Check if the function scheduled an exception. |
| 3087 | ExternalReference scheduled_exception_address = |
| 3088 | ExternalReference::scheduled_exception_address(); |
| 3089 | __ cmp(Operand::StaticVariable(scheduled_exception_address), |
| 3090 | Immediate(Factory::the_hole_value())); |
| 3091 | __ j(not_equal, &promote_scheduled_exception, not_taken); |
| 3092 | if (!kPassHandlesDirectly) { |
| 3093 | // The returned value is a pointer to the handle holding the result. |
| 3094 | // Dereference this to get to the location. |
| 3095 | __ mov(eax, Operand(eax, 0)); |
| 3096 | } |
| 3097 | // Check if the result handle holds 0. |
| 3098 | __ test(eax, Operand(eax)); |
| 3099 | __ j(zero, &empty_handle, not_taken); |
| 3100 | // It was non-zero. Dereference to get the result value. |
| 3101 | __ mov(eax, Operand(eax, 0)); |
| 3102 | __ bind(&prologue); |
| 3103 | __ LeaveExitFrame(ExitFrame::MODE_NORMAL); |
| 3104 | __ ret(0); |
| 3105 | __ bind(&promote_scheduled_exception); |
| 3106 | __ TailCallRuntime(Runtime::kPromoteScheduledException, 0, 1); |
| 3107 | __ bind(&empty_handle); |
| 3108 | // It was zero; the result is undefined. |
| 3109 | __ mov(eax, Factory::undefined_value()); |
| 3110 | __ jmp(&prologue); |
| 3111 | } |
| 3112 | |
| 3113 | |
| 3114 | void CEntryStub::GenerateCore(MacroAssembler* masm, |
| 3115 | Label* throw_normal_exception, |
| 3116 | Label* throw_termination_exception, |
| 3117 | Label* throw_out_of_memory_exception, |
| 3118 | bool do_gc, |
| 3119 | bool always_allocate_scope, |
| 3120 | int /* alignment_skew */) { |
| 3121 | // eax: result parameter for PerformGC, if any |
| 3122 | // ebx: pointer to C function (C callee-saved) |
| 3123 | // ebp: frame pointer (restored after C call) |
| 3124 | // esp: stack pointer (restored after C call) |
| 3125 | // edi: number of arguments including receiver (C callee-saved) |
| 3126 | // esi: pointer to the first argument (C callee-saved) |
| 3127 | |
| 3128 | // Result returned in eax, or eax+edx if result_size_ is 2. |
| 3129 | |
| 3130 | // Check stack alignment. |
| 3131 | if (FLAG_debug_code) { |
| 3132 | __ CheckStackAlignment(); |
| 3133 | } |
| 3134 | |
| 3135 | if (do_gc) { |
| 3136 | // Pass failure code returned from last attempt as first argument to |
| 3137 | // PerformGC. No need to use PrepareCallCFunction/CallCFunction here as the |
| 3138 | // stack alignment is known to be correct. This function takes one argument |
| 3139 | // which is passed on the stack, and we know that the stack has been |
| 3140 | // prepared to pass at least one argument. |
| 3141 | __ mov(Operand(esp, 0 * kPointerSize), eax); // Result. |
| 3142 | __ call(FUNCTION_ADDR(Runtime::PerformGC), RelocInfo::RUNTIME_ENTRY); |
| 3143 | } |
| 3144 | |
| 3145 | ExternalReference scope_depth = |
| 3146 | ExternalReference::heap_always_allocate_scope_depth(); |
| 3147 | if (always_allocate_scope) { |
| 3148 | __ inc(Operand::StaticVariable(scope_depth)); |
| 3149 | } |
| 3150 | |
| 3151 | // Call C function. |
| 3152 | __ mov(Operand(esp, 0 * kPointerSize), edi); // argc. |
| 3153 | __ mov(Operand(esp, 1 * kPointerSize), esi); // argv. |
| 3154 | __ call(Operand(ebx)); |
| 3155 | // Result is in eax or edx:eax - do not destroy these registers! |
| 3156 | |
| 3157 | if (always_allocate_scope) { |
| 3158 | __ dec(Operand::StaticVariable(scope_depth)); |
| 3159 | } |
| 3160 | |
| 3161 | // Make sure we're not trying to return 'the hole' from the runtime |
| 3162 | // call as this may lead to crashes in the IC code later. |
| 3163 | if (FLAG_debug_code) { |
| 3164 | Label okay; |
| 3165 | __ cmp(eax, Factory::the_hole_value()); |
| 3166 | __ j(not_equal, &okay); |
| 3167 | __ int3(); |
| 3168 | __ bind(&okay); |
| 3169 | } |
| 3170 | |
| 3171 | // Check for failure result. |
| 3172 | Label failure_returned; |
| 3173 | STATIC_ASSERT(((kFailureTag + 1) & kFailureTagMask) == 0); |
| 3174 | __ lea(ecx, Operand(eax, 1)); |
| 3175 | // Lower 2 bits of ecx are 0 iff eax has failure tag. |
| 3176 | __ test(ecx, Immediate(kFailureTagMask)); |
| 3177 | __ j(zero, &failure_returned, not_taken); |
| 3178 | |
| 3179 | // Exit the JavaScript to C++ exit frame. |
| 3180 | __ LeaveExitFrame(mode_); |
| 3181 | __ ret(0); |
| 3182 | |
| 3183 | // Handling of failure. |
| 3184 | __ bind(&failure_returned); |
| 3185 | |
| 3186 | Label retry; |
| 3187 | // If the returned exception is RETRY_AFTER_GC continue at retry label |
| 3188 | STATIC_ASSERT(Failure::RETRY_AFTER_GC == 0); |
| 3189 | __ test(eax, Immediate(((1 << kFailureTypeTagSize) - 1) << kFailureTagSize)); |
| 3190 | __ j(zero, &retry, taken); |
| 3191 | |
| 3192 | // Special handling of out of memory exceptions. |
| 3193 | __ cmp(eax, reinterpret_cast<int32_t>(Failure::OutOfMemoryException())); |
| 3194 | __ j(equal, throw_out_of_memory_exception); |
| 3195 | |
| 3196 | // Retrieve the pending exception and clear the variable. |
| 3197 | ExternalReference pending_exception_address(Top::k_pending_exception_address); |
| 3198 | __ mov(eax, Operand::StaticVariable(pending_exception_address)); |
| 3199 | __ mov(edx, |
| 3200 | Operand::StaticVariable(ExternalReference::the_hole_value_location())); |
| 3201 | __ mov(Operand::StaticVariable(pending_exception_address), edx); |
| 3202 | |
| 3203 | // Special handling of termination exceptions which are uncatchable |
| 3204 | // by javascript code. |
| 3205 | __ cmp(eax, Factory::termination_exception()); |
| 3206 | __ j(equal, throw_termination_exception); |
| 3207 | |
| 3208 | // Handle normal exception. |
| 3209 | __ jmp(throw_normal_exception); |
| 3210 | |
| 3211 | // Retry. |
| 3212 | __ bind(&retry); |
| 3213 | } |
| 3214 | |
| 3215 | |
| 3216 | void CEntryStub::GenerateThrowUncatchable(MacroAssembler* masm, |
| 3217 | UncatchableExceptionType type) { |
| 3218 | // Adjust this code if not the case. |
| 3219 | STATIC_ASSERT(StackHandlerConstants::kSize == 4 * kPointerSize); |
| 3220 | |
| 3221 | // Drop sp to the top stack handler. |
| 3222 | ExternalReference handler_address(Top::k_handler_address); |
| 3223 | __ mov(esp, Operand::StaticVariable(handler_address)); |
| 3224 | |
| 3225 | // Unwind the handlers until the ENTRY handler is found. |
| 3226 | Label loop, done; |
| 3227 | __ bind(&loop); |
| 3228 | // Load the type of the current stack handler. |
| 3229 | const int kStateOffset = StackHandlerConstants::kStateOffset; |
| 3230 | __ cmp(Operand(esp, kStateOffset), Immediate(StackHandler::ENTRY)); |
| 3231 | __ j(equal, &done); |
| 3232 | // Fetch the next handler in the list. |
| 3233 | const int kNextOffset = StackHandlerConstants::kNextOffset; |
| 3234 | __ mov(esp, Operand(esp, kNextOffset)); |
| 3235 | __ jmp(&loop); |
| 3236 | __ bind(&done); |
| 3237 | |
| 3238 | // Set the top handler address to next handler past the current ENTRY handler. |
| 3239 | STATIC_ASSERT(StackHandlerConstants::kNextOffset == 0); |
| 3240 | __ pop(Operand::StaticVariable(handler_address)); |
| 3241 | |
| 3242 | if (type == OUT_OF_MEMORY) { |
| 3243 | // Set external caught exception to false. |
| 3244 | ExternalReference external_caught(Top::k_external_caught_exception_address); |
| 3245 | __ mov(eax, false); |
| 3246 | __ mov(Operand::StaticVariable(external_caught), eax); |
| 3247 | |
| 3248 | // Set pending exception and eax to out of memory exception. |
| 3249 | ExternalReference pending_exception(Top::k_pending_exception_address); |
| 3250 | __ mov(eax, reinterpret_cast<int32_t>(Failure::OutOfMemoryException())); |
| 3251 | __ mov(Operand::StaticVariable(pending_exception), eax); |
| 3252 | } |
| 3253 | |
| 3254 | // Clear the context pointer. |
| 3255 | __ xor_(esi, Operand(esi)); |
| 3256 | |
| 3257 | // Restore fp from handler and discard handler state. |
| 3258 | STATIC_ASSERT(StackHandlerConstants::kFPOffset == 1 * kPointerSize); |
| 3259 | __ pop(ebp); |
| 3260 | __ pop(edx); // State. |
| 3261 | |
| 3262 | STATIC_ASSERT(StackHandlerConstants::kPCOffset == 3 * kPointerSize); |
| 3263 | __ ret(0); |
| 3264 | } |
| 3265 | |
| 3266 | |
| 3267 | void CEntryStub::Generate(MacroAssembler* masm) { |
| 3268 | // eax: number of arguments including receiver |
| 3269 | // ebx: pointer to C function (C callee-saved) |
| 3270 | // ebp: frame pointer (restored after C call) |
| 3271 | // esp: stack pointer (restored after C call) |
| 3272 | // esi: current context (C callee-saved) |
| 3273 | // edi: JS function of the caller (C callee-saved) |
| 3274 | |
| 3275 | // NOTE: Invocations of builtins may return failure objects instead |
| 3276 | // of a proper result. The builtin entry handles this by performing |
| 3277 | // a garbage collection and retrying the builtin (twice). |
| 3278 | |
| 3279 | // Enter the exit frame that transitions from JavaScript to C++. |
| 3280 | __ EnterExitFrame(mode_); |
| 3281 | |
| 3282 | // eax: result parameter for PerformGC, if any (setup below) |
| 3283 | // ebx: pointer to builtin function (C callee-saved) |
| 3284 | // ebp: frame pointer (restored after C call) |
| 3285 | // esp: stack pointer (restored after C call) |
| 3286 | // edi: number of arguments including receiver (C callee-saved) |
| 3287 | // esi: argv pointer (C callee-saved) |
| 3288 | |
| 3289 | Label throw_normal_exception; |
| 3290 | Label throw_termination_exception; |
| 3291 | Label throw_out_of_memory_exception; |
| 3292 | |
| 3293 | // Call into the runtime system. |
| 3294 | GenerateCore(masm, |
| 3295 | &throw_normal_exception, |
| 3296 | &throw_termination_exception, |
| 3297 | &throw_out_of_memory_exception, |
| 3298 | false, |
| 3299 | false); |
| 3300 | |
| 3301 | // Do space-specific GC and retry runtime call. |
| 3302 | GenerateCore(masm, |
| 3303 | &throw_normal_exception, |
| 3304 | &throw_termination_exception, |
| 3305 | &throw_out_of_memory_exception, |
| 3306 | true, |
| 3307 | false); |
| 3308 | |
| 3309 | // Do full GC and retry runtime call one final time. |
| 3310 | Failure* failure = Failure::InternalError(); |
| 3311 | __ mov(eax, Immediate(reinterpret_cast<int32_t>(failure))); |
| 3312 | GenerateCore(masm, |
| 3313 | &throw_normal_exception, |
| 3314 | &throw_termination_exception, |
| 3315 | &throw_out_of_memory_exception, |
| 3316 | true, |
| 3317 | true); |
| 3318 | |
| 3319 | __ bind(&throw_out_of_memory_exception); |
| 3320 | GenerateThrowUncatchable(masm, OUT_OF_MEMORY); |
| 3321 | |
| 3322 | __ bind(&throw_termination_exception); |
| 3323 | GenerateThrowUncatchable(masm, TERMINATION); |
| 3324 | |
| 3325 | __ bind(&throw_normal_exception); |
| 3326 | GenerateThrowTOS(masm); |
| 3327 | } |
| 3328 | |
| 3329 | |
| 3330 | void JSEntryStub::GenerateBody(MacroAssembler* masm, bool is_construct) { |
| 3331 | Label invoke, exit; |
| 3332 | #ifdef ENABLE_LOGGING_AND_PROFILING |
| 3333 | Label not_outermost_js, not_outermost_js_2; |
| 3334 | #endif |
| 3335 | |
| 3336 | // Setup frame. |
| 3337 | __ push(ebp); |
| 3338 | __ mov(ebp, Operand(esp)); |
| 3339 | |
| 3340 | // Push marker in two places. |
| 3341 | int marker = is_construct ? StackFrame::ENTRY_CONSTRUCT : StackFrame::ENTRY; |
| 3342 | __ push(Immediate(Smi::FromInt(marker))); // context slot |
| 3343 | __ push(Immediate(Smi::FromInt(marker))); // function slot |
| 3344 | // Save callee-saved registers (C calling conventions). |
| 3345 | __ push(edi); |
| 3346 | __ push(esi); |
| 3347 | __ push(ebx); |
| 3348 | |
| 3349 | // Save copies of the top frame descriptor on the stack. |
| 3350 | ExternalReference c_entry_fp(Top::k_c_entry_fp_address); |
| 3351 | __ push(Operand::StaticVariable(c_entry_fp)); |
| 3352 | |
| 3353 | #ifdef ENABLE_LOGGING_AND_PROFILING |
| 3354 | // If this is the outermost JS call, set js_entry_sp value. |
| 3355 | ExternalReference js_entry_sp(Top::k_js_entry_sp_address); |
| 3356 | __ cmp(Operand::StaticVariable(js_entry_sp), Immediate(0)); |
| 3357 | __ j(not_equal, ¬_outermost_js); |
| 3358 | __ mov(Operand::StaticVariable(js_entry_sp), ebp); |
| 3359 | __ bind(¬_outermost_js); |
| 3360 | #endif |
| 3361 | |
| 3362 | // Call a faked try-block that does the invoke. |
| 3363 | __ call(&invoke); |
| 3364 | |
| 3365 | // Caught exception: Store result (exception) in the pending |
| 3366 | // exception field in the JSEnv and return a failure sentinel. |
| 3367 | ExternalReference pending_exception(Top::k_pending_exception_address); |
| 3368 | __ mov(Operand::StaticVariable(pending_exception), eax); |
| 3369 | __ mov(eax, reinterpret_cast<int32_t>(Failure::Exception())); |
| 3370 | __ jmp(&exit); |
| 3371 | |
| 3372 | // Invoke: Link this frame into the handler chain. |
| 3373 | __ bind(&invoke); |
| 3374 | __ PushTryHandler(IN_JS_ENTRY, JS_ENTRY_HANDLER); |
| 3375 | |
| 3376 | // Clear any pending exceptions. |
| 3377 | __ mov(edx, |
| 3378 | Operand::StaticVariable(ExternalReference::the_hole_value_location())); |
| 3379 | __ mov(Operand::StaticVariable(pending_exception), edx); |
| 3380 | |
| 3381 | // Fake a receiver (NULL). |
| 3382 | __ push(Immediate(0)); // receiver |
| 3383 | |
| 3384 | // Invoke the function by calling through JS entry trampoline |
| 3385 | // builtin and pop the faked function when we return. Notice that we |
| 3386 | // cannot store a reference to the trampoline code directly in this |
| 3387 | // stub, because the builtin stubs may not have been generated yet. |
| 3388 | if (is_construct) { |
| 3389 | ExternalReference construct_entry(Builtins::JSConstructEntryTrampoline); |
| 3390 | __ mov(edx, Immediate(construct_entry)); |
| 3391 | } else { |
| 3392 | ExternalReference entry(Builtins::JSEntryTrampoline); |
| 3393 | __ mov(edx, Immediate(entry)); |
| 3394 | } |
| 3395 | __ mov(edx, Operand(edx, 0)); // deref address |
| 3396 | __ lea(edx, FieldOperand(edx, Code::kHeaderSize)); |
| 3397 | __ call(Operand(edx)); |
| 3398 | |
| 3399 | // Unlink this frame from the handler chain. |
| 3400 | __ pop(Operand::StaticVariable(ExternalReference(Top::k_handler_address))); |
| 3401 | // Pop next_sp. |
| 3402 | __ add(Operand(esp), Immediate(StackHandlerConstants::kSize - kPointerSize)); |
| 3403 | |
| 3404 | #ifdef ENABLE_LOGGING_AND_PROFILING |
| 3405 | // If current EBP value is the same as js_entry_sp value, it means that |
| 3406 | // the current function is the outermost. |
| 3407 | __ cmp(ebp, Operand::StaticVariable(js_entry_sp)); |
| 3408 | __ j(not_equal, ¬_outermost_js_2); |
| 3409 | __ mov(Operand::StaticVariable(js_entry_sp), Immediate(0)); |
| 3410 | __ bind(¬_outermost_js_2); |
| 3411 | #endif |
| 3412 | |
| 3413 | // Restore the top frame descriptor from the stack. |
| 3414 | __ bind(&exit); |
| 3415 | __ pop(Operand::StaticVariable(ExternalReference(Top::k_c_entry_fp_address))); |
| 3416 | |
| 3417 | // Restore callee-saved registers (C calling conventions). |
| 3418 | __ pop(ebx); |
| 3419 | __ pop(esi); |
| 3420 | __ pop(edi); |
| 3421 | __ add(Operand(esp), Immediate(2 * kPointerSize)); // remove markers |
| 3422 | |
| 3423 | // Restore frame pointer and return. |
| 3424 | __ pop(ebp); |
| 3425 | __ ret(0); |
| 3426 | } |
| 3427 | |
| 3428 | |
| 3429 | void InstanceofStub::Generate(MacroAssembler* masm) { |
| 3430 | // Get the object - go slow case if it's a smi. |
| 3431 | Label slow; |
| 3432 | __ mov(eax, Operand(esp, 2 * kPointerSize)); // 2 ~ return address, function |
| 3433 | __ test(eax, Immediate(kSmiTagMask)); |
| 3434 | __ j(zero, &slow, not_taken); |
| 3435 | |
| 3436 | // Check that the left hand is a JS object. |
| 3437 | __ IsObjectJSObjectType(eax, eax, edx, &slow); |
| 3438 | |
| 3439 | // Get the prototype of the function. |
| 3440 | __ mov(edx, Operand(esp, 1 * kPointerSize)); // 1 ~ return address |
| 3441 | // edx is function, eax is map. |
| 3442 | |
| 3443 | // Look up the function and the map in the instanceof cache. |
| 3444 | Label miss; |
| 3445 | ExternalReference roots_address = ExternalReference::roots_address(); |
| 3446 | __ mov(ecx, Immediate(Heap::kInstanceofCacheFunctionRootIndex)); |
| 3447 | __ cmp(edx, Operand::StaticArray(ecx, times_pointer_size, roots_address)); |
| 3448 | __ j(not_equal, &miss); |
| 3449 | __ mov(ecx, Immediate(Heap::kInstanceofCacheMapRootIndex)); |
| 3450 | __ cmp(eax, Operand::StaticArray(ecx, times_pointer_size, roots_address)); |
| 3451 | __ j(not_equal, &miss); |
| 3452 | __ mov(ecx, Immediate(Heap::kInstanceofCacheAnswerRootIndex)); |
| 3453 | __ mov(eax, Operand::StaticArray(ecx, times_pointer_size, roots_address)); |
| 3454 | __ ret(2 * kPointerSize); |
| 3455 | |
| 3456 | __ bind(&miss); |
| 3457 | __ TryGetFunctionPrototype(edx, ebx, ecx, &slow); |
| 3458 | |
| 3459 | // Check that the function prototype is a JS object. |
| 3460 | __ test(ebx, Immediate(kSmiTagMask)); |
| 3461 | __ j(zero, &slow, not_taken); |
| 3462 | __ IsObjectJSObjectType(ebx, ecx, ecx, &slow); |
| 3463 | |
| 3464 | // Register mapping: |
| 3465 | // eax is object map. |
| 3466 | // edx is function. |
| 3467 | // ebx is function prototype. |
| 3468 | __ mov(ecx, Immediate(Heap::kInstanceofCacheMapRootIndex)); |
| 3469 | __ mov(Operand::StaticArray(ecx, times_pointer_size, roots_address), eax); |
| 3470 | __ mov(ecx, Immediate(Heap::kInstanceofCacheFunctionRootIndex)); |
| 3471 | __ mov(Operand::StaticArray(ecx, times_pointer_size, roots_address), edx); |
| 3472 | |
| 3473 | __ mov(ecx, FieldOperand(eax, Map::kPrototypeOffset)); |
| 3474 | |
| 3475 | // Loop through the prototype chain looking for the function prototype. |
| 3476 | Label loop, is_instance, is_not_instance; |
| 3477 | __ bind(&loop); |
| 3478 | __ cmp(ecx, Operand(ebx)); |
| 3479 | __ j(equal, &is_instance); |
| 3480 | __ cmp(Operand(ecx), Immediate(Factory::null_value())); |
| 3481 | __ j(equal, &is_not_instance); |
| 3482 | __ mov(ecx, FieldOperand(ecx, HeapObject::kMapOffset)); |
| 3483 | __ mov(ecx, FieldOperand(ecx, Map::kPrototypeOffset)); |
| 3484 | __ jmp(&loop); |
| 3485 | |
| 3486 | __ bind(&is_instance); |
| 3487 | __ Set(eax, Immediate(0)); |
| 3488 | __ mov(ecx, Immediate(Heap::kInstanceofCacheAnswerRootIndex)); |
| 3489 | __ mov(Operand::StaticArray(ecx, times_pointer_size, roots_address), eax); |
| 3490 | __ ret(2 * kPointerSize); |
| 3491 | |
| 3492 | __ bind(&is_not_instance); |
| 3493 | __ Set(eax, Immediate(Smi::FromInt(1))); |
| 3494 | __ mov(ecx, Immediate(Heap::kInstanceofCacheAnswerRootIndex)); |
| 3495 | __ mov(Operand::StaticArray(ecx, times_pointer_size, roots_address), eax); |
| 3496 | __ ret(2 * kPointerSize); |
| 3497 | |
| 3498 | // Slow-case: Go through the JavaScript implementation. |
| 3499 | __ bind(&slow); |
| 3500 | __ InvokeBuiltin(Builtins::INSTANCE_OF, JUMP_FUNCTION); |
| 3501 | } |
| 3502 | |
| 3503 | |
| 3504 | int CompareStub::MinorKey() { |
| 3505 | // Encode the three parameters in a unique 16 bit value. To avoid duplicate |
| 3506 | // stubs the never NaN NaN condition is only taken into account if the |
| 3507 | // condition is equals. |
| 3508 | ASSERT(static_cast<unsigned>(cc_) < (1 << 12)); |
| 3509 | ASSERT(lhs_.is(no_reg) && rhs_.is(no_reg)); |
| 3510 | return ConditionField::encode(static_cast<unsigned>(cc_)) |
| 3511 | | RegisterField::encode(false) // lhs_ and rhs_ are not used |
| 3512 | | StrictField::encode(strict_) |
| 3513 | | NeverNanNanField::encode(cc_ == equal ? never_nan_nan_ : false) |
| 3514 | | IncludeNumberCompareField::encode(include_number_compare_); |
| 3515 | } |
| 3516 | |
| 3517 | |
| 3518 | // Unfortunately you have to run without snapshots to see most of these |
| 3519 | // names in the profile since most compare stubs end up in the snapshot. |
| 3520 | const char* CompareStub::GetName() { |
| 3521 | ASSERT(lhs_.is(no_reg) && rhs_.is(no_reg)); |
| 3522 | |
| 3523 | if (name_ != NULL) return name_; |
| 3524 | const int kMaxNameLength = 100; |
| 3525 | name_ = Bootstrapper::AllocateAutoDeletedArray(kMaxNameLength); |
| 3526 | if (name_ == NULL) return "OOM"; |
| 3527 | |
| 3528 | const char* cc_name; |
| 3529 | switch (cc_) { |
| 3530 | case less: cc_name = "LT"; break; |
| 3531 | case greater: cc_name = "GT"; break; |
| 3532 | case less_equal: cc_name = "LE"; break; |
| 3533 | case greater_equal: cc_name = "GE"; break; |
| 3534 | case equal: cc_name = "EQ"; break; |
| 3535 | case not_equal: cc_name = "NE"; break; |
| 3536 | default: cc_name = "UnknownCondition"; break; |
| 3537 | } |
| 3538 | |
| 3539 | const char* strict_name = ""; |
| 3540 | if (strict_ && (cc_ == equal || cc_ == not_equal)) { |
| 3541 | strict_name = "_STRICT"; |
| 3542 | } |
| 3543 | |
| 3544 | const char* never_nan_nan_name = ""; |
| 3545 | if (never_nan_nan_ && (cc_ == equal || cc_ == not_equal)) { |
| 3546 | never_nan_nan_name = "_NO_NAN"; |
| 3547 | } |
| 3548 | |
| 3549 | const char* include_number_compare_name = ""; |
| 3550 | if (!include_number_compare_) { |
| 3551 | include_number_compare_name = "_NO_NUMBER"; |
| 3552 | } |
| 3553 | |
| 3554 | OS::SNPrintF(Vector<char>(name_, kMaxNameLength), |
| 3555 | "CompareStub_%s%s%s%s", |
| 3556 | cc_name, |
| 3557 | strict_name, |
| 3558 | never_nan_nan_name, |
| 3559 | include_number_compare_name); |
| 3560 | return name_; |
| 3561 | } |
| 3562 | |
| 3563 | |
| 3564 | // ------------------------------------------------------------------------- |
| 3565 | // StringCharCodeAtGenerator |
| 3566 | |
| 3567 | void StringCharCodeAtGenerator::GenerateFast(MacroAssembler* masm) { |
| 3568 | Label flat_string; |
| 3569 | Label ascii_string; |
| 3570 | Label got_char_code; |
| 3571 | |
| 3572 | // If the receiver is a smi trigger the non-string case. |
| 3573 | STATIC_ASSERT(kSmiTag == 0); |
| 3574 | __ test(object_, Immediate(kSmiTagMask)); |
| 3575 | __ j(zero, receiver_not_string_); |
| 3576 | |
| 3577 | // Fetch the instance type of the receiver into result register. |
| 3578 | __ mov(result_, FieldOperand(object_, HeapObject::kMapOffset)); |
| 3579 | __ movzx_b(result_, FieldOperand(result_, Map::kInstanceTypeOffset)); |
| 3580 | // If the receiver is not a string trigger the non-string case. |
| 3581 | __ test(result_, Immediate(kIsNotStringMask)); |
| 3582 | __ j(not_zero, receiver_not_string_); |
| 3583 | |
| 3584 | // If the index is non-smi trigger the non-smi case. |
| 3585 | STATIC_ASSERT(kSmiTag == 0); |
| 3586 | __ test(index_, Immediate(kSmiTagMask)); |
| 3587 | __ j(not_zero, &index_not_smi_); |
| 3588 | |
| 3589 | // Put smi-tagged index into scratch register. |
| 3590 | __ mov(scratch_, index_); |
| 3591 | __ bind(&got_smi_index_); |
| 3592 | |
| 3593 | // Check for index out of range. |
| 3594 | __ cmp(scratch_, FieldOperand(object_, String::kLengthOffset)); |
| 3595 | __ j(above_equal, index_out_of_range_); |
| 3596 | |
| 3597 | // We need special handling for non-flat strings. |
| 3598 | STATIC_ASSERT(kSeqStringTag == 0); |
| 3599 | __ test(result_, Immediate(kStringRepresentationMask)); |
| 3600 | __ j(zero, &flat_string); |
| 3601 | |
| 3602 | // Handle non-flat strings. |
| 3603 | __ test(result_, Immediate(kIsConsStringMask)); |
| 3604 | __ j(zero, &call_runtime_); |
| 3605 | |
| 3606 | // ConsString. |
| 3607 | // Check whether the right hand side is the empty string (i.e. if |
| 3608 | // this is really a flat string in a cons string). If that is not |
| 3609 | // the case we would rather go to the runtime system now to flatten |
| 3610 | // the string. |
| 3611 | __ cmp(FieldOperand(object_, ConsString::kSecondOffset), |
| 3612 | Immediate(Factory::empty_string())); |
| 3613 | __ j(not_equal, &call_runtime_); |
| 3614 | // Get the first of the two strings and load its instance type. |
| 3615 | __ mov(object_, FieldOperand(object_, ConsString::kFirstOffset)); |
| 3616 | __ mov(result_, FieldOperand(object_, HeapObject::kMapOffset)); |
| 3617 | __ movzx_b(result_, FieldOperand(result_, Map::kInstanceTypeOffset)); |
| 3618 | // If the first cons component is also non-flat, then go to runtime. |
| 3619 | STATIC_ASSERT(kSeqStringTag == 0); |
| 3620 | __ test(result_, Immediate(kStringRepresentationMask)); |
| 3621 | __ j(not_zero, &call_runtime_); |
| 3622 | |
| 3623 | // Check for 1-byte or 2-byte string. |
| 3624 | __ bind(&flat_string); |
| 3625 | STATIC_ASSERT(kAsciiStringTag != 0); |
| 3626 | __ test(result_, Immediate(kStringEncodingMask)); |
| 3627 | __ j(not_zero, &ascii_string); |
| 3628 | |
| 3629 | // 2-byte string. |
| 3630 | // Load the 2-byte character code into the result register. |
| 3631 | STATIC_ASSERT(kSmiTag == 0 && kSmiTagSize == 1); |
| 3632 | __ movzx_w(result_, FieldOperand(object_, |
| 3633 | scratch_, times_1, // Scratch is smi-tagged. |
| 3634 | SeqTwoByteString::kHeaderSize)); |
| 3635 | __ jmp(&got_char_code); |
| 3636 | |
| 3637 | // ASCII string. |
| 3638 | // Load the byte into the result register. |
| 3639 | __ bind(&ascii_string); |
| 3640 | __ SmiUntag(scratch_); |
| 3641 | __ movzx_b(result_, FieldOperand(object_, |
| 3642 | scratch_, times_1, |
| 3643 | SeqAsciiString::kHeaderSize)); |
| 3644 | __ bind(&got_char_code); |
| 3645 | __ SmiTag(result_); |
| 3646 | __ bind(&exit_); |
| 3647 | } |
| 3648 | |
| 3649 | |
| 3650 | void StringCharCodeAtGenerator::GenerateSlow( |
| 3651 | MacroAssembler* masm, const RuntimeCallHelper& call_helper) { |
| 3652 | __ Abort("Unexpected fallthrough to CharCodeAt slow case"); |
| 3653 | |
| 3654 | // Index is not a smi. |
| 3655 | __ bind(&index_not_smi_); |
| 3656 | // If index is a heap number, try converting it to an integer. |
| 3657 | __ CheckMap(index_, Factory::heap_number_map(), index_not_number_, true); |
| 3658 | call_helper.BeforeCall(masm); |
| 3659 | __ push(object_); |
| 3660 | __ push(index_); |
| 3661 | __ push(index_); // Consumed by runtime conversion function. |
| 3662 | if (index_flags_ == STRING_INDEX_IS_NUMBER) { |
| 3663 | __ CallRuntime(Runtime::kNumberToIntegerMapMinusZero, 1); |
| 3664 | } else { |
| 3665 | ASSERT(index_flags_ == STRING_INDEX_IS_ARRAY_INDEX); |
| 3666 | // NumberToSmi discards numbers that are not exact integers. |
| 3667 | __ CallRuntime(Runtime::kNumberToSmi, 1); |
| 3668 | } |
| 3669 | if (!scratch_.is(eax)) { |
| 3670 | // Save the conversion result before the pop instructions below |
| 3671 | // have a chance to overwrite it. |
| 3672 | __ mov(scratch_, eax); |
| 3673 | } |
| 3674 | __ pop(index_); |
| 3675 | __ pop(object_); |
| 3676 | // Reload the instance type. |
| 3677 | __ mov(result_, FieldOperand(object_, HeapObject::kMapOffset)); |
| 3678 | __ movzx_b(result_, FieldOperand(result_, Map::kInstanceTypeOffset)); |
| 3679 | call_helper.AfterCall(masm); |
| 3680 | // If index is still not a smi, it must be out of range. |
| 3681 | STATIC_ASSERT(kSmiTag == 0); |
| 3682 | __ test(scratch_, Immediate(kSmiTagMask)); |
| 3683 | __ j(not_zero, index_out_of_range_); |
| 3684 | // Otherwise, return to the fast path. |
| 3685 | __ jmp(&got_smi_index_); |
| 3686 | |
| 3687 | // Call runtime. We get here when the receiver is a string and the |
| 3688 | // index is a number, but the code of getting the actual character |
| 3689 | // is too complex (e.g., when the string needs to be flattened). |
| 3690 | __ bind(&call_runtime_); |
| 3691 | call_helper.BeforeCall(masm); |
| 3692 | __ push(object_); |
| 3693 | __ push(index_); |
| 3694 | __ CallRuntime(Runtime::kStringCharCodeAt, 2); |
| 3695 | if (!result_.is(eax)) { |
| 3696 | __ mov(result_, eax); |
| 3697 | } |
| 3698 | call_helper.AfterCall(masm); |
| 3699 | __ jmp(&exit_); |
| 3700 | |
| 3701 | __ Abort("Unexpected fallthrough from CharCodeAt slow case"); |
| 3702 | } |
| 3703 | |
| 3704 | |
| 3705 | // ------------------------------------------------------------------------- |
| 3706 | // StringCharFromCodeGenerator |
| 3707 | |
| 3708 | void StringCharFromCodeGenerator::GenerateFast(MacroAssembler* masm) { |
| 3709 | // Fast case of Heap::LookupSingleCharacterStringFromCode. |
| 3710 | STATIC_ASSERT(kSmiTag == 0); |
| 3711 | STATIC_ASSERT(kSmiShiftSize == 0); |
| 3712 | ASSERT(IsPowerOf2(String::kMaxAsciiCharCode + 1)); |
| 3713 | __ test(code_, |
| 3714 | Immediate(kSmiTagMask | |
| 3715 | ((~String::kMaxAsciiCharCode) << kSmiTagSize))); |
| 3716 | __ j(not_zero, &slow_case_, not_taken); |
| 3717 | |
| 3718 | __ Set(result_, Immediate(Factory::single_character_string_cache())); |
| 3719 | STATIC_ASSERT(kSmiTag == 0); |
| 3720 | STATIC_ASSERT(kSmiTagSize == 1); |
| 3721 | STATIC_ASSERT(kSmiShiftSize == 0); |
| 3722 | // At this point code register contains smi tagged ascii char code. |
| 3723 | __ mov(result_, FieldOperand(result_, |
| 3724 | code_, times_half_pointer_size, |
| 3725 | FixedArray::kHeaderSize)); |
| 3726 | __ cmp(result_, Factory::undefined_value()); |
| 3727 | __ j(equal, &slow_case_, not_taken); |
| 3728 | __ bind(&exit_); |
| 3729 | } |
| 3730 | |
| 3731 | |
| 3732 | void StringCharFromCodeGenerator::GenerateSlow( |
| 3733 | MacroAssembler* masm, const RuntimeCallHelper& call_helper) { |
| 3734 | __ Abort("Unexpected fallthrough to CharFromCode slow case"); |
| 3735 | |
| 3736 | __ bind(&slow_case_); |
| 3737 | call_helper.BeforeCall(masm); |
| 3738 | __ push(code_); |
| 3739 | __ CallRuntime(Runtime::kCharFromCode, 1); |
| 3740 | if (!result_.is(eax)) { |
| 3741 | __ mov(result_, eax); |
| 3742 | } |
| 3743 | call_helper.AfterCall(masm); |
| 3744 | __ jmp(&exit_); |
| 3745 | |
| 3746 | __ Abort("Unexpected fallthrough from CharFromCode slow case"); |
| 3747 | } |
| 3748 | |
| 3749 | |
| 3750 | // ------------------------------------------------------------------------- |
| 3751 | // StringCharAtGenerator |
| 3752 | |
| 3753 | void StringCharAtGenerator::GenerateFast(MacroAssembler* masm) { |
| 3754 | char_code_at_generator_.GenerateFast(masm); |
| 3755 | char_from_code_generator_.GenerateFast(masm); |
| 3756 | } |
| 3757 | |
| 3758 | |
| 3759 | void StringCharAtGenerator::GenerateSlow( |
| 3760 | MacroAssembler* masm, const RuntimeCallHelper& call_helper) { |
| 3761 | char_code_at_generator_.GenerateSlow(masm, call_helper); |
| 3762 | char_from_code_generator_.GenerateSlow(masm, call_helper); |
| 3763 | } |
| 3764 | |
| 3765 | |
| 3766 | void StringAddStub::Generate(MacroAssembler* masm) { |
| 3767 | Label string_add_runtime; |
| 3768 | |
| 3769 | // Load the two arguments. |
| 3770 | __ mov(eax, Operand(esp, 2 * kPointerSize)); // First argument. |
| 3771 | __ mov(edx, Operand(esp, 1 * kPointerSize)); // Second argument. |
| 3772 | |
| 3773 | // Make sure that both arguments are strings if not known in advance. |
| 3774 | if (string_check_) { |
| 3775 | __ test(eax, Immediate(kSmiTagMask)); |
| 3776 | __ j(zero, &string_add_runtime); |
| 3777 | __ CmpObjectType(eax, FIRST_NONSTRING_TYPE, ebx); |
| 3778 | __ j(above_equal, &string_add_runtime); |
| 3779 | |
| 3780 | // First argument is a a string, test second. |
| 3781 | __ test(edx, Immediate(kSmiTagMask)); |
| 3782 | __ j(zero, &string_add_runtime); |
| 3783 | __ CmpObjectType(edx, FIRST_NONSTRING_TYPE, ebx); |
| 3784 | __ j(above_equal, &string_add_runtime); |
| 3785 | } |
| 3786 | |
| 3787 | // Both arguments are strings. |
| 3788 | // eax: first string |
| 3789 | // edx: second string |
| 3790 | // Check if either of the strings are empty. In that case return the other. |
| 3791 | Label second_not_zero_length, both_not_zero_length; |
| 3792 | __ mov(ecx, FieldOperand(edx, String::kLengthOffset)); |
| 3793 | STATIC_ASSERT(kSmiTag == 0); |
| 3794 | __ test(ecx, Operand(ecx)); |
| 3795 | __ j(not_zero, &second_not_zero_length); |
| 3796 | // Second string is empty, result is first string which is already in eax. |
| 3797 | __ IncrementCounter(&Counters::string_add_native, 1); |
| 3798 | __ ret(2 * kPointerSize); |
| 3799 | __ bind(&second_not_zero_length); |
| 3800 | __ mov(ebx, FieldOperand(eax, String::kLengthOffset)); |
| 3801 | STATIC_ASSERT(kSmiTag == 0); |
| 3802 | __ test(ebx, Operand(ebx)); |
| 3803 | __ j(not_zero, &both_not_zero_length); |
| 3804 | // First string is empty, result is second string which is in edx. |
| 3805 | __ mov(eax, edx); |
| 3806 | __ IncrementCounter(&Counters::string_add_native, 1); |
| 3807 | __ ret(2 * kPointerSize); |
| 3808 | |
| 3809 | // Both strings are non-empty. |
| 3810 | // eax: first string |
| 3811 | // ebx: length of first string as a smi |
| 3812 | // ecx: length of second string as a smi |
| 3813 | // edx: second string |
| 3814 | // Look at the length of the result of adding the two strings. |
| 3815 | Label string_add_flat_result, longer_than_two; |
| 3816 | __ bind(&both_not_zero_length); |
| 3817 | __ add(ebx, Operand(ecx)); |
| 3818 | STATIC_ASSERT(Smi::kMaxValue == String::kMaxLength); |
| 3819 | // Handle exceptionally long strings in the runtime system. |
| 3820 | __ j(overflow, &string_add_runtime); |
| 3821 | // Use the runtime system when adding two one character strings, as it |
| 3822 | // contains optimizations for this specific case using the symbol table. |
| 3823 | __ cmp(Operand(ebx), Immediate(Smi::FromInt(2))); |
| 3824 | __ j(not_equal, &longer_than_two); |
| 3825 | |
| 3826 | // Check that both strings are non-external ascii strings. |
| 3827 | __ JumpIfNotBothSequentialAsciiStrings(eax, edx, ebx, ecx, |
| 3828 | &string_add_runtime); |
| 3829 | |
| 3830 | // Get the two characters forming the sub string. |
| 3831 | __ movzx_b(ebx, FieldOperand(eax, SeqAsciiString::kHeaderSize)); |
| 3832 | __ movzx_b(ecx, FieldOperand(edx, SeqAsciiString::kHeaderSize)); |
| 3833 | |
| 3834 | // Try to lookup two character string in symbol table. If it is not found |
| 3835 | // just allocate a new one. |
| 3836 | Label make_two_character_string, make_flat_ascii_string; |
| 3837 | StringHelper::GenerateTwoCharacterSymbolTableProbe( |
| 3838 | masm, ebx, ecx, eax, edx, edi, &make_two_character_string); |
| 3839 | __ IncrementCounter(&Counters::string_add_native, 1); |
| 3840 | __ ret(2 * kPointerSize); |
| 3841 | |
| 3842 | __ bind(&make_two_character_string); |
| 3843 | __ Set(ebx, Immediate(Smi::FromInt(2))); |
| 3844 | __ jmp(&make_flat_ascii_string); |
| 3845 | |
| 3846 | __ bind(&longer_than_two); |
| 3847 | // Check if resulting string will be flat. |
| 3848 | __ cmp(Operand(ebx), Immediate(Smi::FromInt(String::kMinNonFlatLength))); |
| 3849 | __ j(below, &string_add_flat_result); |
| 3850 | |
| 3851 | // If result is not supposed to be flat allocate a cons string object. If both |
| 3852 | // strings are ascii the result is an ascii cons string. |
| 3853 | Label non_ascii, allocated, ascii_data; |
| 3854 | __ mov(edi, FieldOperand(eax, HeapObject::kMapOffset)); |
| 3855 | __ movzx_b(ecx, FieldOperand(edi, Map::kInstanceTypeOffset)); |
| 3856 | __ mov(edi, FieldOperand(edx, HeapObject::kMapOffset)); |
| 3857 | __ movzx_b(edi, FieldOperand(edi, Map::kInstanceTypeOffset)); |
| 3858 | __ and_(ecx, Operand(edi)); |
| 3859 | STATIC_ASSERT(kStringEncodingMask == kAsciiStringTag); |
| 3860 | __ test(ecx, Immediate(kAsciiStringTag)); |
| 3861 | __ j(zero, &non_ascii); |
| 3862 | __ bind(&ascii_data); |
| 3863 | // Allocate an acsii cons string. |
| 3864 | __ AllocateAsciiConsString(ecx, edi, no_reg, &string_add_runtime); |
| 3865 | __ bind(&allocated); |
| 3866 | // Fill the fields of the cons string. |
| 3867 | if (FLAG_debug_code) __ AbortIfNotSmi(ebx); |
| 3868 | __ mov(FieldOperand(ecx, ConsString::kLengthOffset), ebx); |
| 3869 | __ mov(FieldOperand(ecx, ConsString::kHashFieldOffset), |
| 3870 | Immediate(String::kEmptyHashField)); |
| 3871 | __ mov(FieldOperand(ecx, ConsString::kFirstOffset), eax); |
| 3872 | __ mov(FieldOperand(ecx, ConsString::kSecondOffset), edx); |
| 3873 | __ mov(eax, ecx); |
| 3874 | __ IncrementCounter(&Counters::string_add_native, 1); |
| 3875 | __ ret(2 * kPointerSize); |
| 3876 | __ bind(&non_ascii); |
| 3877 | // At least one of the strings is two-byte. Check whether it happens |
| 3878 | // to contain only ascii characters. |
| 3879 | // ecx: first instance type AND second instance type. |
| 3880 | // edi: second instance type. |
| 3881 | __ test(ecx, Immediate(kAsciiDataHintMask)); |
| 3882 | __ j(not_zero, &ascii_data); |
| 3883 | __ mov(ecx, FieldOperand(eax, HeapObject::kMapOffset)); |
| 3884 | __ movzx_b(ecx, FieldOperand(ecx, Map::kInstanceTypeOffset)); |
| 3885 | __ xor_(edi, Operand(ecx)); |
| 3886 | STATIC_ASSERT(kAsciiStringTag != 0 && kAsciiDataHintTag != 0); |
| 3887 | __ and_(edi, kAsciiStringTag | kAsciiDataHintTag); |
| 3888 | __ cmp(edi, kAsciiStringTag | kAsciiDataHintTag); |
| 3889 | __ j(equal, &ascii_data); |
| 3890 | // Allocate a two byte cons string. |
| 3891 | __ AllocateConsString(ecx, edi, no_reg, &string_add_runtime); |
| 3892 | __ jmp(&allocated); |
| 3893 | |
| 3894 | // Handle creating a flat result. First check that both strings are not |
| 3895 | // external strings. |
| 3896 | // eax: first string |
| 3897 | // ebx: length of resulting flat string as a smi |
| 3898 | // edx: second string |
| 3899 | __ bind(&string_add_flat_result); |
| 3900 | __ mov(ecx, FieldOperand(eax, HeapObject::kMapOffset)); |
| 3901 | __ movzx_b(ecx, FieldOperand(ecx, Map::kInstanceTypeOffset)); |
| 3902 | __ and_(ecx, kStringRepresentationMask); |
| 3903 | __ cmp(ecx, kExternalStringTag); |
| 3904 | __ j(equal, &string_add_runtime); |
| 3905 | __ mov(ecx, FieldOperand(edx, HeapObject::kMapOffset)); |
| 3906 | __ movzx_b(ecx, FieldOperand(ecx, Map::kInstanceTypeOffset)); |
| 3907 | __ and_(ecx, kStringRepresentationMask); |
| 3908 | __ cmp(ecx, kExternalStringTag); |
| 3909 | __ j(equal, &string_add_runtime); |
| 3910 | // Now check if both strings are ascii strings. |
| 3911 | // eax: first string |
| 3912 | // ebx: length of resulting flat string as a smi |
| 3913 | // edx: second string |
| 3914 | Label non_ascii_string_add_flat_result; |
| 3915 | STATIC_ASSERT(kStringEncodingMask == kAsciiStringTag); |
| 3916 | __ mov(ecx, FieldOperand(eax, HeapObject::kMapOffset)); |
| 3917 | __ test_b(FieldOperand(ecx, Map::kInstanceTypeOffset), kAsciiStringTag); |
| 3918 | __ j(zero, &non_ascii_string_add_flat_result); |
| 3919 | __ mov(ecx, FieldOperand(edx, HeapObject::kMapOffset)); |
| 3920 | __ test_b(FieldOperand(ecx, Map::kInstanceTypeOffset), kAsciiStringTag); |
| 3921 | __ j(zero, &string_add_runtime); |
| 3922 | |
| 3923 | __ bind(&make_flat_ascii_string); |
| 3924 | // Both strings are ascii strings. As they are short they are both flat. |
| 3925 | // ebx: length of resulting flat string as a smi |
| 3926 | __ SmiUntag(ebx); |
| 3927 | __ AllocateAsciiString(eax, ebx, ecx, edx, edi, &string_add_runtime); |
| 3928 | // eax: result string |
| 3929 | __ mov(ecx, eax); |
| 3930 | // Locate first character of result. |
| 3931 | __ add(Operand(ecx), Immediate(SeqAsciiString::kHeaderSize - kHeapObjectTag)); |
| 3932 | // Load first argument and locate first character. |
| 3933 | __ mov(edx, Operand(esp, 2 * kPointerSize)); |
| 3934 | __ mov(edi, FieldOperand(edx, String::kLengthOffset)); |
| 3935 | __ SmiUntag(edi); |
| 3936 | __ add(Operand(edx), Immediate(SeqAsciiString::kHeaderSize - kHeapObjectTag)); |
| 3937 | // eax: result string |
| 3938 | // ecx: first character of result |
| 3939 | // edx: first char of first argument |
| 3940 | // edi: length of first argument |
| 3941 | StringHelper::GenerateCopyCharacters(masm, ecx, edx, edi, ebx, true); |
| 3942 | // Load second argument and locate first character. |
| 3943 | __ mov(edx, Operand(esp, 1 * kPointerSize)); |
| 3944 | __ mov(edi, FieldOperand(edx, String::kLengthOffset)); |
| 3945 | __ SmiUntag(edi); |
| 3946 | __ add(Operand(edx), Immediate(SeqAsciiString::kHeaderSize - kHeapObjectTag)); |
| 3947 | // eax: result string |
| 3948 | // ecx: next character of result |
| 3949 | // edx: first char of second argument |
| 3950 | // edi: length of second argument |
| 3951 | StringHelper::GenerateCopyCharacters(masm, ecx, edx, edi, ebx, true); |
| 3952 | __ IncrementCounter(&Counters::string_add_native, 1); |
| 3953 | __ ret(2 * kPointerSize); |
| 3954 | |
| 3955 | // Handle creating a flat two byte result. |
| 3956 | // eax: first string - known to be two byte |
| 3957 | // ebx: length of resulting flat string as a smi |
| 3958 | // edx: second string |
| 3959 | __ bind(&non_ascii_string_add_flat_result); |
| 3960 | __ mov(ecx, FieldOperand(edx, HeapObject::kMapOffset)); |
| 3961 | __ test_b(FieldOperand(ecx, Map::kInstanceTypeOffset), kAsciiStringTag); |
| 3962 | __ j(not_zero, &string_add_runtime); |
| 3963 | // Both strings are two byte strings. As they are short they are both |
| 3964 | // flat. |
| 3965 | __ SmiUntag(ebx); |
| 3966 | __ AllocateTwoByteString(eax, ebx, ecx, edx, edi, &string_add_runtime); |
| 3967 | // eax: result string |
| 3968 | __ mov(ecx, eax); |
| 3969 | // Locate first character of result. |
| 3970 | __ add(Operand(ecx), |
| 3971 | Immediate(SeqTwoByteString::kHeaderSize - kHeapObjectTag)); |
| 3972 | // Load first argument and locate first character. |
| 3973 | __ mov(edx, Operand(esp, 2 * kPointerSize)); |
| 3974 | __ mov(edi, FieldOperand(edx, String::kLengthOffset)); |
| 3975 | __ SmiUntag(edi); |
| 3976 | __ add(Operand(edx), |
| 3977 | Immediate(SeqTwoByteString::kHeaderSize - kHeapObjectTag)); |
| 3978 | // eax: result string |
| 3979 | // ecx: first character of result |
| 3980 | // edx: first char of first argument |
| 3981 | // edi: length of first argument |
| 3982 | StringHelper::GenerateCopyCharacters(masm, ecx, edx, edi, ebx, false); |
| 3983 | // Load second argument and locate first character. |
| 3984 | __ mov(edx, Operand(esp, 1 * kPointerSize)); |
| 3985 | __ mov(edi, FieldOperand(edx, String::kLengthOffset)); |
| 3986 | __ SmiUntag(edi); |
| 3987 | __ add(Operand(edx), Immediate(SeqAsciiString::kHeaderSize - kHeapObjectTag)); |
| 3988 | // eax: result string |
| 3989 | // ecx: next character of result |
| 3990 | // edx: first char of second argument |
| 3991 | // edi: length of second argument |
| 3992 | StringHelper::GenerateCopyCharacters(masm, ecx, edx, edi, ebx, false); |
| 3993 | __ IncrementCounter(&Counters::string_add_native, 1); |
| 3994 | __ ret(2 * kPointerSize); |
| 3995 | |
| 3996 | // Just jump to runtime to add the two strings. |
| 3997 | __ bind(&string_add_runtime); |
| 3998 | __ TailCallRuntime(Runtime::kStringAdd, 2, 1); |
| 3999 | } |
| 4000 | |
| 4001 | |
| 4002 | void StringHelper::GenerateCopyCharacters(MacroAssembler* masm, |
| 4003 | Register dest, |
| 4004 | Register src, |
| 4005 | Register count, |
| 4006 | Register scratch, |
| 4007 | bool ascii) { |
| 4008 | Label loop; |
| 4009 | __ bind(&loop); |
| 4010 | // This loop just copies one character at a time, as it is only used for very |
| 4011 | // short strings. |
| 4012 | if (ascii) { |
| 4013 | __ mov_b(scratch, Operand(src, 0)); |
| 4014 | __ mov_b(Operand(dest, 0), scratch); |
| 4015 | __ add(Operand(src), Immediate(1)); |
| 4016 | __ add(Operand(dest), Immediate(1)); |
| 4017 | } else { |
| 4018 | __ mov_w(scratch, Operand(src, 0)); |
| 4019 | __ mov_w(Operand(dest, 0), scratch); |
| 4020 | __ add(Operand(src), Immediate(2)); |
| 4021 | __ add(Operand(dest), Immediate(2)); |
| 4022 | } |
| 4023 | __ sub(Operand(count), Immediate(1)); |
| 4024 | __ j(not_zero, &loop); |
| 4025 | } |
| 4026 | |
| 4027 | |
| 4028 | void StringHelper::GenerateCopyCharactersREP(MacroAssembler* masm, |
| 4029 | Register dest, |
| 4030 | Register src, |
| 4031 | Register count, |
| 4032 | Register scratch, |
| 4033 | bool ascii) { |
| 4034 | // Copy characters using rep movs of doublewords. |
| 4035 | // The destination is aligned on a 4 byte boundary because we are |
| 4036 | // copying to the beginning of a newly allocated string. |
| 4037 | ASSERT(dest.is(edi)); // rep movs destination |
| 4038 | ASSERT(src.is(esi)); // rep movs source |
| 4039 | ASSERT(count.is(ecx)); // rep movs count |
| 4040 | ASSERT(!scratch.is(dest)); |
| 4041 | ASSERT(!scratch.is(src)); |
| 4042 | ASSERT(!scratch.is(count)); |
| 4043 | |
| 4044 | // Nothing to do for zero characters. |
| 4045 | Label done; |
| 4046 | __ test(count, Operand(count)); |
| 4047 | __ j(zero, &done); |
| 4048 | |
| 4049 | // Make count the number of bytes to copy. |
| 4050 | if (!ascii) { |
| 4051 | __ shl(count, 1); |
| 4052 | } |
| 4053 | |
| 4054 | // Don't enter the rep movs if there are less than 4 bytes to copy. |
| 4055 | Label last_bytes; |
| 4056 | __ test(count, Immediate(~3)); |
| 4057 | __ j(zero, &last_bytes); |
| 4058 | |
| 4059 | // Copy from edi to esi using rep movs instruction. |
| 4060 | __ mov(scratch, count); |
| 4061 | __ sar(count, 2); // Number of doublewords to copy. |
| 4062 | __ cld(); |
| 4063 | __ rep_movs(); |
| 4064 | |
| 4065 | // Find number of bytes left. |
| 4066 | __ mov(count, scratch); |
| 4067 | __ and_(count, 3); |
| 4068 | |
| 4069 | // Check if there are more bytes to copy. |
| 4070 | __ bind(&last_bytes); |
| 4071 | __ test(count, Operand(count)); |
| 4072 | __ j(zero, &done); |
| 4073 | |
| 4074 | // Copy remaining characters. |
| 4075 | Label loop; |
| 4076 | __ bind(&loop); |
| 4077 | __ mov_b(scratch, Operand(src, 0)); |
| 4078 | __ mov_b(Operand(dest, 0), scratch); |
| 4079 | __ add(Operand(src), Immediate(1)); |
| 4080 | __ add(Operand(dest), Immediate(1)); |
| 4081 | __ sub(Operand(count), Immediate(1)); |
| 4082 | __ j(not_zero, &loop); |
| 4083 | |
| 4084 | __ bind(&done); |
| 4085 | } |
| 4086 | |
| 4087 | |
| 4088 | void StringHelper::GenerateTwoCharacterSymbolTableProbe(MacroAssembler* masm, |
| 4089 | Register c1, |
| 4090 | Register c2, |
| 4091 | Register scratch1, |
| 4092 | Register scratch2, |
| 4093 | Register scratch3, |
| 4094 | Label* not_found) { |
| 4095 | // Register scratch3 is the general scratch register in this function. |
| 4096 | Register scratch = scratch3; |
| 4097 | |
| 4098 | // Make sure that both characters are not digits as such strings has a |
| 4099 | // different hash algorithm. Don't try to look for these in the symbol table. |
| 4100 | Label not_array_index; |
| 4101 | __ mov(scratch, c1); |
| 4102 | __ sub(Operand(scratch), Immediate(static_cast<int>('0'))); |
| 4103 | __ cmp(Operand(scratch), Immediate(static_cast<int>('9' - '0'))); |
| 4104 | __ j(above, ¬_array_index); |
| 4105 | __ mov(scratch, c2); |
| 4106 | __ sub(Operand(scratch), Immediate(static_cast<int>('0'))); |
| 4107 | __ cmp(Operand(scratch), Immediate(static_cast<int>('9' - '0'))); |
| 4108 | __ j(below_equal, not_found); |
| 4109 | |
| 4110 | __ bind(¬_array_index); |
| 4111 | // Calculate the two character string hash. |
| 4112 | Register hash = scratch1; |
| 4113 | GenerateHashInit(masm, hash, c1, scratch); |
| 4114 | GenerateHashAddCharacter(masm, hash, c2, scratch); |
| 4115 | GenerateHashGetHash(masm, hash, scratch); |
| 4116 | |
| 4117 | // Collect the two characters in a register. |
| 4118 | Register chars = c1; |
| 4119 | __ shl(c2, kBitsPerByte); |
| 4120 | __ or_(chars, Operand(c2)); |
| 4121 | |
| 4122 | // chars: two character string, char 1 in byte 0 and char 2 in byte 1. |
| 4123 | // hash: hash of two character string. |
| 4124 | |
| 4125 | // Load the symbol table. |
| 4126 | Register symbol_table = c2; |
| 4127 | ExternalReference roots_address = ExternalReference::roots_address(); |
| 4128 | __ mov(scratch, Immediate(Heap::kSymbolTableRootIndex)); |
| 4129 | __ mov(symbol_table, |
| 4130 | Operand::StaticArray(scratch, times_pointer_size, roots_address)); |
| 4131 | |
| 4132 | // Calculate capacity mask from the symbol table capacity. |
| 4133 | Register mask = scratch2; |
| 4134 | __ mov(mask, FieldOperand(symbol_table, SymbolTable::kCapacityOffset)); |
| 4135 | __ SmiUntag(mask); |
| 4136 | __ sub(Operand(mask), Immediate(1)); |
| 4137 | |
| 4138 | // Registers |
| 4139 | // chars: two character string, char 1 in byte 0 and char 2 in byte 1. |
| 4140 | // hash: hash of two character string |
| 4141 | // symbol_table: symbol table |
| 4142 | // mask: capacity mask |
| 4143 | // scratch: - |
| 4144 | |
| 4145 | // Perform a number of probes in the symbol table. |
| 4146 | static const int kProbes = 4; |
| 4147 | Label found_in_symbol_table; |
| 4148 | Label next_probe[kProbes], next_probe_pop_mask[kProbes]; |
| 4149 | for (int i = 0; i < kProbes; i++) { |
| 4150 | // Calculate entry in symbol table. |
| 4151 | __ mov(scratch, hash); |
| 4152 | if (i > 0) { |
| 4153 | __ add(Operand(scratch), Immediate(SymbolTable::GetProbeOffset(i))); |
| 4154 | } |
| 4155 | __ and_(scratch, Operand(mask)); |
| 4156 | |
| 4157 | // Load the entry from the symbol table. |
| 4158 | Register candidate = scratch; // Scratch register contains candidate. |
| 4159 | STATIC_ASSERT(SymbolTable::kEntrySize == 1); |
| 4160 | __ mov(candidate, |
| 4161 | FieldOperand(symbol_table, |
| 4162 | scratch, |
| 4163 | times_pointer_size, |
| 4164 | SymbolTable::kElementsStartOffset)); |
| 4165 | |
| 4166 | // If entry is undefined no string with this hash can be found. |
| 4167 | __ cmp(candidate, Factory::undefined_value()); |
| 4168 | __ j(equal, not_found); |
| 4169 | |
| 4170 | // If length is not 2 the string is not a candidate. |
| 4171 | __ cmp(FieldOperand(candidate, String::kLengthOffset), |
| 4172 | Immediate(Smi::FromInt(2))); |
| 4173 | __ j(not_equal, &next_probe[i]); |
| 4174 | |
| 4175 | // As we are out of registers save the mask on the stack and use that |
| 4176 | // register as a temporary. |
| 4177 | __ push(mask); |
| 4178 | Register temp = mask; |
| 4179 | |
| 4180 | // Check that the candidate is a non-external ascii string. |
| 4181 | __ mov(temp, FieldOperand(candidate, HeapObject::kMapOffset)); |
| 4182 | __ movzx_b(temp, FieldOperand(temp, Map::kInstanceTypeOffset)); |
| 4183 | __ JumpIfInstanceTypeIsNotSequentialAscii( |
| 4184 | temp, temp, &next_probe_pop_mask[i]); |
| 4185 | |
| 4186 | // Check if the two characters match. |
| 4187 | __ mov(temp, FieldOperand(candidate, SeqAsciiString::kHeaderSize)); |
| 4188 | __ and_(temp, 0x0000ffff); |
| 4189 | __ cmp(chars, Operand(temp)); |
| 4190 | __ j(equal, &found_in_symbol_table); |
| 4191 | __ bind(&next_probe_pop_mask[i]); |
| 4192 | __ pop(mask); |
| 4193 | __ bind(&next_probe[i]); |
| 4194 | } |
| 4195 | |
| 4196 | // No matching 2 character string found by probing. |
| 4197 | __ jmp(not_found); |
| 4198 | |
| 4199 | // Scratch register contains result when we fall through to here. |
| 4200 | Register result = scratch; |
| 4201 | __ bind(&found_in_symbol_table); |
| 4202 | __ pop(mask); // Pop saved mask from the stack. |
| 4203 | if (!result.is(eax)) { |
| 4204 | __ mov(eax, result); |
| 4205 | } |
| 4206 | } |
| 4207 | |
| 4208 | |
| 4209 | void StringHelper::GenerateHashInit(MacroAssembler* masm, |
| 4210 | Register hash, |
| 4211 | Register character, |
| 4212 | Register scratch) { |
| 4213 | // hash = character + (character << 10); |
| 4214 | __ mov(hash, character); |
| 4215 | __ shl(hash, 10); |
| 4216 | __ add(hash, Operand(character)); |
| 4217 | // hash ^= hash >> 6; |
| 4218 | __ mov(scratch, hash); |
| 4219 | __ sar(scratch, 6); |
| 4220 | __ xor_(hash, Operand(scratch)); |
| 4221 | } |
| 4222 | |
| 4223 | |
| 4224 | void StringHelper::GenerateHashAddCharacter(MacroAssembler* masm, |
| 4225 | Register hash, |
| 4226 | Register character, |
| 4227 | Register scratch) { |
| 4228 | // hash += character; |
| 4229 | __ add(hash, Operand(character)); |
| 4230 | // hash += hash << 10; |
| 4231 | __ mov(scratch, hash); |
| 4232 | __ shl(scratch, 10); |
| 4233 | __ add(hash, Operand(scratch)); |
| 4234 | // hash ^= hash >> 6; |
| 4235 | __ mov(scratch, hash); |
| 4236 | __ sar(scratch, 6); |
| 4237 | __ xor_(hash, Operand(scratch)); |
| 4238 | } |
| 4239 | |
| 4240 | |
| 4241 | void StringHelper::GenerateHashGetHash(MacroAssembler* masm, |
| 4242 | Register hash, |
| 4243 | Register scratch) { |
| 4244 | // hash += hash << 3; |
| 4245 | __ mov(scratch, hash); |
| 4246 | __ shl(scratch, 3); |
| 4247 | __ add(hash, Operand(scratch)); |
| 4248 | // hash ^= hash >> 11; |
| 4249 | __ mov(scratch, hash); |
| 4250 | __ sar(scratch, 11); |
| 4251 | __ xor_(hash, Operand(scratch)); |
| 4252 | // hash += hash << 15; |
| 4253 | __ mov(scratch, hash); |
| 4254 | __ shl(scratch, 15); |
| 4255 | __ add(hash, Operand(scratch)); |
| 4256 | |
| 4257 | // if (hash == 0) hash = 27; |
| 4258 | Label hash_not_zero; |
| 4259 | __ test(hash, Operand(hash)); |
| 4260 | __ j(not_zero, &hash_not_zero); |
| 4261 | __ mov(hash, Immediate(27)); |
| 4262 | __ bind(&hash_not_zero); |
| 4263 | } |
| 4264 | |
| 4265 | |
| 4266 | void SubStringStub::Generate(MacroAssembler* masm) { |
| 4267 | Label runtime; |
| 4268 | |
| 4269 | // Stack frame on entry. |
| 4270 | // esp[0]: return address |
| 4271 | // esp[4]: to |
| 4272 | // esp[8]: from |
| 4273 | // esp[12]: string |
| 4274 | |
| 4275 | // Make sure first argument is a string. |
| 4276 | __ mov(eax, Operand(esp, 3 * kPointerSize)); |
| 4277 | STATIC_ASSERT(kSmiTag == 0); |
| 4278 | __ test(eax, Immediate(kSmiTagMask)); |
| 4279 | __ j(zero, &runtime); |
| 4280 | Condition is_string = masm->IsObjectStringType(eax, ebx, ebx); |
| 4281 | __ j(NegateCondition(is_string), &runtime); |
| 4282 | |
| 4283 | // eax: string |
| 4284 | // ebx: instance type |
| 4285 | |
| 4286 | // Calculate length of sub string using the smi values. |
| 4287 | Label result_longer_than_two; |
| 4288 | __ mov(ecx, Operand(esp, 1 * kPointerSize)); // To index. |
| 4289 | __ test(ecx, Immediate(kSmiTagMask)); |
| 4290 | __ j(not_zero, &runtime); |
| 4291 | __ mov(edx, Operand(esp, 2 * kPointerSize)); // From index. |
| 4292 | __ test(edx, Immediate(kSmiTagMask)); |
| 4293 | __ j(not_zero, &runtime); |
| 4294 | __ sub(ecx, Operand(edx)); |
| 4295 | __ cmp(ecx, FieldOperand(eax, String::kLengthOffset)); |
| 4296 | Label return_eax; |
| 4297 | __ j(equal, &return_eax); |
| 4298 | // Special handling of sub-strings of length 1 and 2. One character strings |
| 4299 | // are handled in the runtime system (looked up in the single character |
| 4300 | // cache). Two character strings are looked for in the symbol cache. |
| 4301 | __ SmiUntag(ecx); // Result length is no longer smi. |
| 4302 | __ cmp(ecx, 2); |
| 4303 | __ j(greater, &result_longer_than_two); |
| 4304 | __ j(less, &runtime); |
| 4305 | |
| 4306 | // Sub string of length 2 requested. |
| 4307 | // eax: string |
| 4308 | // ebx: instance type |
| 4309 | // ecx: sub string length (value is 2) |
| 4310 | // edx: from index (smi) |
| 4311 | __ JumpIfInstanceTypeIsNotSequentialAscii(ebx, ebx, &runtime); |
| 4312 | |
| 4313 | // Get the two characters forming the sub string. |
| 4314 | __ SmiUntag(edx); // From index is no longer smi. |
| 4315 | __ movzx_b(ebx, FieldOperand(eax, edx, times_1, SeqAsciiString::kHeaderSize)); |
| 4316 | __ movzx_b(ecx, |
| 4317 | FieldOperand(eax, edx, times_1, SeqAsciiString::kHeaderSize + 1)); |
| 4318 | |
| 4319 | // Try to lookup two character string in symbol table. |
| 4320 | Label make_two_character_string; |
| 4321 | StringHelper::GenerateTwoCharacterSymbolTableProbe( |
| 4322 | masm, ebx, ecx, eax, edx, edi, &make_two_character_string); |
| 4323 | __ ret(3 * kPointerSize); |
| 4324 | |
| 4325 | __ bind(&make_two_character_string); |
| 4326 | // Setup registers for allocating the two character string. |
| 4327 | __ mov(eax, Operand(esp, 3 * kPointerSize)); |
| 4328 | __ mov(ebx, FieldOperand(eax, HeapObject::kMapOffset)); |
| 4329 | __ movzx_b(ebx, FieldOperand(ebx, Map::kInstanceTypeOffset)); |
| 4330 | __ Set(ecx, Immediate(2)); |
| 4331 | |
| 4332 | __ bind(&result_longer_than_two); |
| 4333 | // eax: string |
| 4334 | // ebx: instance type |
| 4335 | // ecx: result string length |
| 4336 | // Check for flat ascii string |
| 4337 | Label non_ascii_flat; |
| 4338 | __ JumpIfInstanceTypeIsNotSequentialAscii(ebx, ebx, &non_ascii_flat); |
| 4339 | |
| 4340 | // Allocate the result. |
| 4341 | __ AllocateAsciiString(eax, ecx, ebx, edx, edi, &runtime); |
| 4342 | |
| 4343 | // eax: result string |
| 4344 | // ecx: result string length |
| 4345 | __ mov(edx, esi); // esi used by following code. |
| 4346 | // Locate first character of result. |
| 4347 | __ mov(edi, eax); |
| 4348 | __ add(Operand(edi), Immediate(SeqAsciiString::kHeaderSize - kHeapObjectTag)); |
| 4349 | // Load string argument and locate character of sub string start. |
| 4350 | __ mov(esi, Operand(esp, 3 * kPointerSize)); |
| 4351 | __ add(Operand(esi), Immediate(SeqAsciiString::kHeaderSize - kHeapObjectTag)); |
| 4352 | __ mov(ebx, Operand(esp, 2 * kPointerSize)); // from |
| 4353 | __ SmiUntag(ebx); |
| 4354 | __ add(esi, Operand(ebx)); |
| 4355 | |
| 4356 | // eax: result string |
| 4357 | // ecx: result length |
| 4358 | // edx: original value of esi |
| 4359 | // edi: first character of result |
| 4360 | // esi: character of sub string start |
| 4361 | StringHelper::GenerateCopyCharactersREP(masm, edi, esi, ecx, ebx, true); |
| 4362 | __ mov(esi, edx); // Restore esi. |
| 4363 | __ IncrementCounter(&Counters::sub_string_native, 1); |
| 4364 | __ ret(3 * kPointerSize); |
| 4365 | |
| 4366 | __ bind(&non_ascii_flat); |
| 4367 | // eax: string |
| 4368 | // ebx: instance type & kStringRepresentationMask | kStringEncodingMask |
| 4369 | // ecx: result string length |
| 4370 | // Check for flat two byte string |
| 4371 | __ cmp(ebx, kSeqStringTag | kTwoByteStringTag); |
| 4372 | __ j(not_equal, &runtime); |
| 4373 | |
| 4374 | // Allocate the result. |
| 4375 | __ AllocateTwoByteString(eax, ecx, ebx, edx, edi, &runtime); |
| 4376 | |
| 4377 | // eax: result string |
| 4378 | // ecx: result string length |
| 4379 | __ mov(edx, esi); // esi used by following code. |
| 4380 | // Locate first character of result. |
| 4381 | __ mov(edi, eax); |
| 4382 | __ add(Operand(edi), |
| 4383 | Immediate(SeqTwoByteString::kHeaderSize - kHeapObjectTag)); |
| 4384 | // Load string argument and locate character of sub string start. |
| 4385 | __ mov(esi, Operand(esp, 3 * kPointerSize)); |
| 4386 | __ add(Operand(esi), |
| 4387 | Immediate(SeqTwoByteString::kHeaderSize - kHeapObjectTag)); |
| 4388 | __ mov(ebx, Operand(esp, 2 * kPointerSize)); // from |
| 4389 | // As from is a smi it is 2 times the value which matches the size of a two |
| 4390 | // byte character. |
| 4391 | STATIC_ASSERT(kSmiTag == 0); |
| 4392 | STATIC_ASSERT(kSmiTagSize + kSmiShiftSize == 1); |
| 4393 | __ add(esi, Operand(ebx)); |
| 4394 | |
| 4395 | // eax: result string |
| 4396 | // ecx: result length |
| 4397 | // edx: original value of esi |
| 4398 | // edi: first character of result |
| 4399 | // esi: character of sub string start |
| 4400 | StringHelper::GenerateCopyCharactersREP(masm, edi, esi, ecx, ebx, false); |
| 4401 | __ mov(esi, edx); // Restore esi. |
| 4402 | |
| 4403 | __ bind(&return_eax); |
| 4404 | __ IncrementCounter(&Counters::sub_string_native, 1); |
| 4405 | __ ret(3 * kPointerSize); |
| 4406 | |
| 4407 | // Just jump to runtime to create the sub string. |
| 4408 | __ bind(&runtime); |
| 4409 | __ TailCallRuntime(Runtime::kSubString, 3, 1); |
| 4410 | } |
| 4411 | |
| 4412 | |
| 4413 | void StringCompareStub::GenerateCompareFlatAsciiStrings(MacroAssembler* masm, |
| 4414 | Register left, |
| 4415 | Register right, |
| 4416 | Register scratch1, |
| 4417 | Register scratch2, |
| 4418 | Register scratch3) { |
| 4419 | Label result_not_equal; |
| 4420 | Label result_greater; |
| 4421 | Label compare_lengths; |
| 4422 | |
| 4423 | __ IncrementCounter(&Counters::string_compare_native, 1); |
| 4424 | |
| 4425 | // Find minimum length. |
| 4426 | Label left_shorter; |
| 4427 | __ mov(scratch1, FieldOperand(left, String::kLengthOffset)); |
| 4428 | __ mov(scratch3, scratch1); |
| 4429 | __ sub(scratch3, FieldOperand(right, String::kLengthOffset)); |
| 4430 | |
| 4431 | Register length_delta = scratch3; |
| 4432 | |
| 4433 | __ j(less_equal, &left_shorter); |
| 4434 | // Right string is shorter. Change scratch1 to be length of right string. |
| 4435 | __ sub(scratch1, Operand(length_delta)); |
| 4436 | __ bind(&left_shorter); |
| 4437 | |
| 4438 | Register min_length = scratch1; |
| 4439 | |
| 4440 | // If either length is zero, just compare lengths. |
| 4441 | __ test(min_length, Operand(min_length)); |
| 4442 | __ j(zero, &compare_lengths); |
| 4443 | |
| 4444 | // Change index to run from -min_length to -1 by adding min_length |
| 4445 | // to string start. This means that loop ends when index reaches zero, |
| 4446 | // which doesn't need an additional compare. |
| 4447 | __ SmiUntag(min_length); |
| 4448 | __ lea(left, |
| 4449 | FieldOperand(left, |
| 4450 | min_length, times_1, |
| 4451 | SeqAsciiString::kHeaderSize)); |
| 4452 | __ lea(right, |
| 4453 | FieldOperand(right, |
| 4454 | min_length, times_1, |
| 4455 | SeqAsciiString::kHeaderSize)); |
| 4456 | __ neg(min_length); |
| 4457 | |
| 4458 | Register index = min_length; // index = -min_length; |
| 4459 | |
| 4460 | { |
| 4461 | // Compare loop. |
| 4462 | Label loop; |
| 4463 | __ bind(&loop); |
| 4464 | // Compare characters. |
| 4465 | __ mov_b(scratch2, Operand(left, index, times_1, 0)); |
| 4466 | __ cmpb(scratch2, Operand(right, index, times_1, 0)); |
| 4467 | __ j(not_equal, &result_not_equal); |
| 4468 | __ add(Operand(index), Immediate(1)); |
| 4469 | __ j(not_zero, &loop); |
| 4470 | } |
| 4471 | |
| 4472 | // Compare lengths - strings up to min-length are equal. |
| 4473 | __ bind(&compare_lengths); |
| 4474 | __ test(length_delta, Operand(length_delta)); |
| 4475 | __ j(not_zero, &result_not_equal); |
| 4476 | |
| 4477 | // Result is EQUAL. |
| 4478 | STATIC_ASSERT(EQUAL == 0); |
| 4479 | STATIC_ASSERT(kSmiTag == 0); |
| 4480 | __ Set(eax, Immediate(Smi::FromInt(EQUAL))); |
| 4481 | __ ret(0); |
| 4482 | |
| 4483 | __ bind(&result_not_equal); |
| 4484 | __ j(greater, &result_greater); |
| 4485 | |
| 4486 | // Result is LESS. |
| 4487 | __ Set(eax, Immediate(Smi::FromInt(LESS))); |
| 4488 | __ ret(0); |
| 4489 | |
| 4490 | // Result is GREATER. |
| 4491 | __ bind(&result_greater); |
| 4492 | __ Set(eax, Immediate(Smi::FromInt(GREATER))); |
| 4493 | __ ret(0); |
| 4494 | } |
| 4495 | |
| 4496 | |
| 4497 | void StringCompareStub::Generate(MacroAssembler* masm) { |
| 4498 | Label runtime; |
| 4499 | |
| 4500 | // Stack frame on entry. |
| 4501 | // esp[0]: return address |
| 4502 | // esp[4]: right string |
| 4503 | // esp[8]: left string |
| 4504 | |
| 4505 | __ mov(edx, Operand(esp, 2 * kPointerSize)); // left |
| 4506 | __ mov(eax, Operand(esp, 1 * kPointerSize)); // right |
| 4507 | |
| 4508 | Label not_same; |
| 4509 | __ cmp(edx, Operand(eax)); |
| 4510 | __ j(not_equal, ¬_same); |
| 4511 | STATIC_ASSERT(EQUAL == 0); |
| 4512 | STATIC_ASSERT(kSmiTag == 0); |
| 4513 | __ Set(eax, Immediate(Smi::FromInt(EQUAL))); |
| 4514 | __ IncrementCounter(&Counters::string_compare_native, 1); |
| 4515 | __ ret(2 * kPointerSize); |
| 4516 | |
| 4517 | __ bind(¬_same); |
| 4518 | |
| 4519 | // Check that both objects are sequential ascii strings. |
| 4520 | __ JumpIfNotBothSequentialAsciiStrings(edx, eax, ecx, ebx, &runtime); |
| 4521 | |
| 4522 | // Compare flat ascii strings. |
| 4523 | // Drop arguments from the stack. |
| 4524 | __ pop(ecx); |
| 4525 | __ add(Operand(esp), Immediate(2 * kPointerSize)); |
| 4526 | __ push(ecx); |
| 4527 | GenerateCompareFlatAsciiStrings(masm, edx, eax, ecx, ebx, edi); |
| 4528 | |
| 4529 | // Call the runtime; it returns -1 (less), 0 (equal), or 1 (greater) |
| 4530 | // tagged as a small integer. |
| 4531 | __ bind(&runtime); |
| 4532 | __ TailCallRuntime(Runtime::kStringCompare, 2, 1); |
| 4533 | } |
| 4534 | |
| 4535 | #undef __ |
| 4536 | |
| 4537 | } } // namespace v8::internal |
| 4538 | |
| 4539 | #endif // V8_TARGET_ARCH_IA32 |