Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 1 | // Copyright 2012 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 5 | #include "src/x87/codegen-x87.h" |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 6 | |
| 7 | #if V8_TARGET_ARCH_X87 |
| 8 | |
| 9 | #include "src/codegen.h" |
| 10 | #include "src/heap/heap.h" |
| 11 | #include "src/macro-assembler.h" |
| 12 | |
| 13 | namespace v8 { |
| 14 | namespace internal { |
| 15 | |
| 16 | |
| 17 | // ------------------------------------------------------------------------- |
| 18 | // Platform-specific RuntimeCallHelper functions. |
| 19 | |
| 20 | void StubRuntimeCallHelper::BeforeCall(MacroAssembler* masm) const { |
| 21 | masm->EnterFrame(StackFrame::INTERNAL); |
| 22 | DCHECK(!masm->has_frame()); |
| 23 | masm->set_has_frame(true); |
| 24 | } |
| 25 | |
| 26 | |
| 27 | void StubRuntimeCallHelper::AfterCall(MacroAssembler* masm) const { |
| 28 | masm->LeaveFrame(StackFrame::INTERNAL); |
| 29 | DCHECK(masm->has_frame()); |
| 30 | masm->set_has_frame(false); |
| 31 | } |
| 32 | |
| 33 | |
| 34 | #define __ masm. |
| 35 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 36 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 37 | UnaryMathFunctionWithIsolate CreateSqrtFunction(Isolate* isolate) { |
| 38 | size_t actual_size; |
| 39 | // Allocate buffer in executable space. |
| 40 | byte* buffer = |
| 41 | static_cast<byte*>(base::OS::Allocate(1 * KB, &actual_size, true)); |
| 42 | if (buffer == nullptr) return nullptr; |
| 43 | |
| 44 | MacroAssembler masm(isolate, buffer, static_cast<int>(actual_size), |
| 45 | CodeObjectRequired::kNo); |
| 46 | // Load double input into registers. |
| 47 | __ fld_d(MemOperand(esp, 4)); |
| 48 | __ X87SetFPUCW(0x027F); |
| 49 | __ fsqrt(); |
| 50 | __ X87SetFPUCW(0x037F); |
| 51 | __ Ret(); |
| 52 | |
| 53 | CodeDesc desc; |
| 54 | masm.GetCode(&desc); |
| 55 | DCHECK(!RelocInfo::RequiresRelocation(desc)); |
| 56 | |
| 57 | Assembler::FlushICache(isolate, buffer, actual_size); |
| 58 | base::OS::ProtectCode(buffer, actual_size); |
| 59 | return FUNCTION_CAST<UnaryMathFunctionWithIsolate>(buffer); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 60 | } |
| 61 | |
| 62 | |
| 63 | // Helper functions for CreateMemMoveFunction. |
| 64 | #undef __ |
| 65 | #define __ ACCESS_MASM(masm) |
| 66 | |
| 67 | enum Direction { FORWARD, BACKWARD }; |
| 68 | enum Alignment { MOVE_ALIGNED, MOVE_UNALIGNED }; |
| 69 | |
| 70 | |
| 71 | void MemMoveEmitPopAndReturn(MacroAssembler* masm) { |
| 72 | __ pop(esi); |
| 73 | __ pop(edi); |
| 74 | __ ret(0); |
| 75 | } |
| 76 | |
| 77 | |
| 78 | #undef __ |
| 79 | #define __ masm. |
| 80 | |
| 81 | |
| 82 | class LabelConverter { |
| 83 | public: |
| 84 | explicit LabelConverter(byte* buffer) : buffer_(buffer) {} |
| 85 | int32_t address(Label* l) const { |
| 86 | return reinterpret_cast<int32_t>(buffer_) + l->pos(); |
| 87 | } |
| 88 | private: |
| 89 | byte* buffer_; |
| 90 | }; |
| 91 | |
| 92 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 93 | MemMoveFunction CreateMemMoveFunction(Isolate* isolate) { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 94 | size_t actual_size; |
| 95 | // Allocate buffer in executable space. |
| 96 | byte* buffer = |
| 97 | static_cast<byte*>(base::OS::Allocate(1 * KB, &actual_size, true)); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 98 | if (buffer == nullptr) return nullptr; |
| 99 | MacroAssembler masm(isolate, buffer, static_cast<int>(actual_size), |
| 100 | CodeObjectRequired::kNo); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 101 | LabelConverter conv(buffer); |
| 102 | |
| 103 | // Generated code is put into a fixed, unmovable buffer, and not into |
| 104 | // the V8 heap. We can't, and don't, refer to any relocatable addresses |
| 105 | // (e.g. the JavaScript nan-object). |
| 106 | |
| 107 | // 32-bit C declaration function calls pass arguments on stack. |
| 108 | |
| 109 | // Stack layout: |
| 110 | // esp[12]: Third argument, size. |
| 111 | // esp[8]: Second argument, source pointer. |
| 112 | // esp[4]: First argument, destination pointer. |
| 113 | // esp[0]: return address |
| 114 | |
| 115 | const int kDestinationOffset = 1 * kPointerSize; |
| 116 | const int kSourceOffset = 2 * kPointerSize; |
| 117 | const int kSizeOffset = 3 * kPointerSize; |
| 118 | |
| 119 | int stack_offset = 0; // Update if we change the stack height. |
| 120 | |
| 121 | Label backward, backward_much_overlap; |
| 122 | Label forward_much_overlap, small_size, medium_size, pop_and_return; |
| 123 | __ push(edi); |
| 124 | __ push(esi); |
| 125 | stack_offset += 2 * kPointerSize; |
| 126 | Register dst = edi; |
| 127 | Register src = esi; |
| 128 | Register count = ecx; |
| 129 | __ mov(dst, Operand(esp, stack_offset + kDestinationOffset)); |
| 130 | __ mov(src, Operand(esp, stack_offset + kSourceOffset)); |
| 131 | __ mov(count, Operand(esp, stack_offset + kSizeOffset)); |
| 132 | |
| 133 | __ cmp(dst, src); |
| 134 | __ j(equal, &pop_and_return); |
| 135 | |
| 136 | // No SSE2. |
| 137 | Label forward; |
| 138 | __ cmp(count, 0); |
| 139 | __ j(equal, &pop_and_return); |
| 140 | __ cmp(dst, src); |
| 141 | __ j(above, &backward); |
| 142 | __ jmp(&forward); |
| 143 | { |
| 144 | // Simple forward copier. |
| 145 | Label forward_loop_1byte, forward_loop_4byte; |
| 146 | __ bind(&forward_loop_4byte); |
| 147 | __ mov(eax, Operand(src, 0)); |
| 148 | __ sub(count, Immediate(4)); |
| 149 | __ add(src, Immediate(4)); |
| 150 | __ mov(Operand(dst, 0), eax); |
| 151 | __ add(dst, Immediate(4)); |
| 152 | __ bind(&forward); // Entry point. |
| 153 | __ cmp(count, 3); |
| 154 | __ j(above, &forward_loop_4byte); |
| 155 | __ bind(&forward_loop_1byte); |
| 156 | __ cmp(count, 0); |
| 157 | __ j(below_equal, &pop_and_return); |
| 158 | __ mov_b(eax, Operand(src, 0)); |
| 159 | __ dec(count); |
| 160 | __ inc(src); |
| 161 | __ mov_b(Operand(dst, 0), eax); |
| 162 | __ inc(dst); |
| 163 | __ jmp(&forward_loop_1byte); |
| 164 | } |
| 165 | { |
| 166 | // Simple backward copier. |
| 167 | Label backward_loop_1byte, backward_loop_4byte, entry_shortcut; |
| 168 | __ bind(&backward); |
| 169 | __ add(src, count); |
| 170 | __ add(dst, count); |
| 171 | __ cmp(count, 3); |
| 172 | __ j(below_equal, &entry_shortcut); |
| 173 | |
| 174 | __ bind(&backward_loop_4byte); |
| 175 | __ sub(src, Immediate(4)); |
| 176 | __ sub(count, Immediate(4)); |
| 177 | __ mov(eax, Operand(src, 0)); |
| 178 | __ sub(dst, Immediate(4)); |
| 179 | __ mov(Operand(dst, 0), eax); |
| 180 | __ cmp(count, 3); |
| 181 | __ j(above, &backward_loop_4byte); |
| 182 | __ bind(&backward_loop_1byte); |
| 183 | __ cmp(count, 0); |
| 184 | __ j(below_equal, &pop_and_return); |
| 185 | __ bind(&entry_shortcut); |
| 186 | __ dec(src); |
| 187 | __ dec(count); |
| 188 | __ mov_b(eax, Operand(src, 0)); |
| 189 | __ dec(dst); |
| 190 | __ mov_b(Operand(dst, 0), eax); |
| 191 | __ jmp(&backward_loop_1byte); |
| 192 | } |
| 193 | |
| 194 | __ bind(&pop_and_return); |
| 195 | MemMoveEmitPopAndReturn(&masm); |
| 196 | |
| 197 | CodeDesc desc; |
| 198 | masm.GetCode(&desc); |
| 199 | DCHECK(!RelocInfo::RequiresRelocation(desc)); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 200 | Assembler::FlushICache(isolate, buffer, actual_size); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 201 | base::OS::ProtectCode(buffer, actual_size); |
| 202 | // TODO(jkummerow): It would be nice to register this code creation event |
| 203 | // with the PROFILE / GDBJIT system. |
| 204 | return FUNCTION_CAST<MemMoveFunction>(buffer); |
| 205 | } |
| 206 | |
| 207 | |
| 208 | #undef __ |
| 209 | |
| 210 | // ------------------------------------------------------------------------- |
| 211 | // Code generators |
| 212 | |
| 213 | #define __ ACCESS_MASM(masm) |
| 214 | |
| 215 | |
| 216 | void ElementsTransitionGenerator::GenerateMapChangeElementsTransition( |
| 217 | MacroAssembler* masm, |
| 218 | Register receiver, |
| 219 | Register key, |
| 220 | Register value, |
| 221 | Register target_map, |
| 222 | AllocationSiteMode mode, |
| 223 | Label* allocation_memento_found) { |
| 224 | Register scratch = edi; |
| 225 | DCHECK(!AreAliased(receiver, key, value, target_map, scratch)); |
| 226 | |
| 227 | if (mode == TRACK_ALLOCATION_SITE) { |
| 228 | DCHECK(allocation_memento_found != NULL); |
| 229 | __ JumpIfJSArrayHasAllocationMemento( |
| 230 | receiver, scratch, allocation_memento_found); |
| 231 | } |
| 232 | |
| 233 | // Set transitioned map. |
| 234 | __ mov(FieldOperand(receiver, HeapObject::kMapOffset), target_map); |
| 235 | __ RecordWriteField(receiver, HeapObject::kMapOffset, target_map, scratch, |
| 236 | kDontSaveFPRegs, EMIT_REMEMBERED_SET, OMIT_SMI_CHECK); |
| 237 | } |
| 238 | |
| 239 | |
| 240 | void ElementsTransitionGenerator::GenerateSmiToDouble( |
| 241 | MacroAssembler* masm, |
| 242 | Register receiver, |
| 243 | Register key, |
| 244 | Register value, |
| 245 | Register target_map, |
| 246 | AllocationSiteMode mode, |
| 247 | Label* fail) { |
| 248 | // Return address is on the stack. |
| 249 | DCHECK(receiver.is(edx)); |
| 250 | DCHECK(key.is(ecx)); |
| 251 | DCHECK(value.is(eax)); |
| 252 | DCHECK(target_map.is(ebx)); |
| 253 | |
| 254 | Label loop, entry, convert_hole, gc_required, only_change_map; |
| 255 | |
| 256 | if (mode == TRACK_ALLOCATION_SITE) { |
| 257 | __ JumpIfJSArrayHasAllocationMemento(edx, edi, fail); |
| 258 | } |
| 259 | |
| 260 | // Check for empty arrays, which only require a map transition and no changes |
| 261 | // to the backing store. |
| 262 | __ mov(edi, FieldOperand(edx, JSObject::kElementsOffset)); |
| 263 | __ cmp(edi, Immediate(masm->isolate()->factory()->empty_fixed_array())); |
| 264 | __ j(equal, &only_change_map); |
| 265 | |
| 266 | __ push(eax); |
| 267 | __ push(ebx); |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 268 | __ push(esi); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 269 | |
| 270 | __ mov(edi, FieldOperand(edi, FixedArray::kLengthOffset)); |
| 271 | |
| 272 | // Allocate new FixedDoubleArray. |
| 273 | // edx: receiver |
| 274 | // edi: length of source FixedArray (smi-tagged) |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 275 | AllocationFlags flags = static_cast<AllocationFlags>(DOUBLE_ALIGNMENT); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 276 | __ Allocate(FixedDoubleArray::kHeaderSize, times_8, edi, |
| 277 | REGISTER_VALUE_IS_SMI, eax, ebx, no_reg, &gc_required, flags); |
| 278 | |
| 279 | // eax: destination FixedDoubleArray |
| 280 | // edi: number of elements |
| 281 | // edx: receiver |
| 282 | __ mov(FieldOperand(eax, HeapObject::kMapOffset), |
| 283 | Immediate(masm->isolate()->factory()->fixed_double_array_map())); |
| 284 | __ mov(FieldOperand(eax, FixedDoubleArray::kLengthOffset), edi); |
| 285 | __ mov(esi, FieldOperand(edx, JSObject::kElementsOffset)); |
| 286 | // Replace receiver's backing store with newly created FixedDoubleArray. |
| 287 | __ mov(FieldOperand(edx, JSObject::kElementsOffset), eax); |
| 288 | __ mov(ebx, eax); |
| 289 | __ RecordWriteField(edx, JSObject::kElementsOffset, ebx, edi, kDontSaveFPRegs, |
| 290 | EMIT_REMEMBERED_SET, OMIT_SMI_CHECK); |
| 291 | |
| 292 | __ mov(edi, FieldOperand(esi, FixedArray::kLengthOffset)); |
| 293 | |
| 294 | // Prepare for conversion loop. |
| 295 | ExternalReference canonical_the_hole_nan_reference = |
| 296 | ExternalReference::address_of_the_hole_nan(); |
| 297 | __ jmp(&entry); |
| 298 | |
| 299 | // Call into runtime if GC is required. |
| 300 | __ bind(&gc_required); |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 301 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 302 | // Restore registers before jumping into runtime. |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 303 | __ pop(esi); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 304 | __ pop(ebx); |
| 305 | __ pop(eax); |
| 306 | __ jmp(fail); |
| 307 | |
| 308 | // Convert and copy elements |
| 309 | // esi: source FixedArray |
| 310 | __ bind(&loop); |
| 311 | __ mov(ebx, FieldOperand(esi, edi, times_2, FixedArray::kHeaderSize)); |
| 312 | // ebx: current element from source |
| 313 | // edi: index of current element |
| 314 | __ JumpIfNotSmi(ebx, &convert_hole); |
| 315 | |
| 316 | // Normal smi, convert it to double and store. |
| 317 | __ SmiUntag(ebx); |
| 318 | __ push(ebx); |
| 319 | __ fild_s(Operand(esp, 0)); |
| 320 | __ pop(ebx); |
| 321 | __ fstp_d(FieldOperand(eax, edi, times_4, FixedDoubleArray::kHeaderSize)); |
| 322 | __ jmp(&entry); |
| 323 | |
| 324 | // Found hole, store hole_nan_as_double instead. |
| 325 | __ bind(&convert_hole); |
| 326 | |
| 327 | if (FLAG_debug_code) { |
| 328 | __ cmp(ebx, masm->isolate()->factory()->the_hole_value()); |
| 329 | __ Assert(equal, kObjectFoundInSmiOnlyArray); |
| 330 | } |
| 331 | |
| 332 | __ fld_d(Operand::StaticVariable(canonical_the_hole_nan_reference)); |
| 333 | __ fstp_d(FieldOperand(eax, edi, times_4, FixedDoubleArray::kHeaderSize)); |
| 334 | |
| 335 | __ bind(&entry); |
| 336 | __ sub(edi, Immediate(Smi::FromInt(1))); |
| 337 | __ j(not_sign, &loop); |
| 338 | |
Ben Murdoch | 61f157c | 2016-09-16 13:49:30 +0100 | [diff] [blame] | 339 | // Restore registers. |
| 340 | __ pop(esi); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 341 | __ pop(ebx); |
| 342 | __ pop(eax); |
| 343 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 344 | __ bind(&only_change_map); |
| 345 | // eax: value |
| 346 | // ebx: target map |
| 347 | // Set transitioned map. |
| 348 | __ mov(FieldOperand(edx, HeapObject::kMapOffset), ebx); |
| 349 | __ RecordWriteField(edx, HeapObject::kMapOffset, ebx, edi, kDontSaveFPRegs, |
| 350 | OMIT_REMEMBERED_SET, OMIT_SMI_CHECK); |
| 351 | } |
| 352 | |
| 353 | |
| 354 | void ElementsTransitionGenerator::GenerateDoubleToObject( |
| 355 | MacroAssembler* masm, |
| 356 | Register receiver, |
| 357 | Register key, |
| 358 | Register value, |
| 359 | Register target_map, |
| 360 | AllocationSiteMode mode, |
| 361 | Label* fail) { |
| 362 | // Return address is on the stack. |
| 363 | DCHECK(receiver.is(edx)); |
| 364 | DCHECK(key.is(ecx)); |
| 365 | DCHECK(value.is(eax)); |
| 366 | DCHECK(target_map.is(ebx)); |
| 367 | |
| 368 | Label loop, entry, convert_hole, gc_required, only_change_map, success; |
| 369 | |
| 370 | if (mode == TRACK_ALLOCATION_SITE) { |
| 371 | __ JumpIfJSArrayHasAllocationMemento(edx, edi, fail); |
| 372 | } |
| 373 | |
| 374 | // Check for empty arrays, which only require a map transition and no changes |
| 375 | // to the backing store. |
| 376 | __ mov(edi, FieldOperand(edx, JSObject::kElementsOffset)); |
| 377 | __ cmp(edi, Immediate(masm->isolate()->factory()->empty_fixed_array())); |
| 378 | __ j(equal, &only_change_map); |
| 379 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 380 | __ push(esi); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 381 | __ push(eax); |
| 382 | __ push(edx); |
| 383 | __ push(ebx); |
| 384 | |
| 385 | __ mov(ebx, FieldOperand(edi, FixedDoubleArray::kLengthOffset)); |
| 386 | |
| 387 | // Allocate new FixedArray. |
| 388 | // ebx: length of source FixedDoubleArray (smi-tagged) |
| 389 | __ lea(edi, Operand(ebx, times_2, FixedArray::kHeaderSize)); |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame] | 390 | __ Allocate(edi, eax, esi, no_reg, &gc_required, NO_ALLOCATION_FLAGS); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 391 | |
| 392 | // eax: destination FixedArray |
| 393 | // ebx: number of elements |
| 394 | __ mov(FieldOperand(eax, HeapObject::kMapOffset), |
| 395 | Immediate(masm->isolate()->factory()->fixed_array_map())); |
| 396 | __ mov(FieldOperand(eax, FixedArray::kLengthOffset), ebx); |
| 397 | __ mov(edi, FieldOperand(edx, JSObject::kElementsOffset)); |
| 398 | |
Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame] | 399 | // Allocating heap numbers in the loop below can fail and cause a jump to |
| 400 | // gc_required. We can't leave a partly initialized FixedArray behind, |
| 401 | // so pessimistically fill it with holes now. |
| 402 | Label initialization_loop, initialization_loop_entry; |
| 403 | __ jmp(&initialization_loop_entry, Label::kNear); |
| 404 | __ bind(&initialization_loop); |
| 405 | __ mov(FieldOperand(eax, ebx, times_2, FixedArray::kHeaderSize), |
| 406 | masm->isolate()->factory()->the_hole_value()); |
| 407 | __ bind(&initialization_loop_entry); |
| 408 | __ sub(ebx, Immediate(Smi::FromInt(1))); |
| 409 | __ j(not_sign, &initialization_loop); |
| 410 | |
| 411 | __ mov(ebx, FieldOperand(edi, FixedDoubleArray::kLengthOffset)); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 412 | __ jmp(&entry); |
| 413 | |
| 414 | // ebx: target map |
| 415 | // edx: receiver |
| 416 | // Set transitioned map. |
| 417 | __ bind(&only_change_map); |
| 418 | __ mov(FieldOperand(edx, HeapObject::kMapOffset), ebx); |
| 419 | __ RecordWriteField(edx, HeapObject::kMapOffset, ebx, edi, kDontSaveFPRegs, |
| 420 | OMIT_REMEMBERED_SET, OMIT_SMI_CHECK); |
| 421 | __ jmp(&success); |
| 422 | |
| 423 | // Call into runtime if GC is required. |
| 424 | __ bind(&gc_required); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 425 | __ pop(ebx); |
| 426 | __ pop(edx); |
| 427 | __ pop(eax); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 428 | __ pop(esi); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 429 | __ jmp(fail); |
| 430 | |
| 431 | // Box doubles into heap numbers. |
| 432 | // edi: source FixedDoubleArray |
| 433 | // eax: destination FixedArray |
| 434 | __ bind(&loop); |
| 435 | // ebx: index of current element (smi-tagged) |
| 436 | uint32_t offset = FixedDoubleArray::kHeaderSize + sizeof(kHoleNanLower32); |
| 437 | __ cmp(FieldOperand(edi, ebx, times_4, offset), Immediate(kHoleNanUpper32)); |
| 438 | __ j(equal, &convert_hole); |
| 439 | |
| 440 | // Non-hole double, copy value into a heap number. |
| 441 | __ AllocateHeapNumber(edx, esi, no_reg, &gc_required); |
| 442 | // edx: new heap number |
| 443 | __ mov(esi, FieldOperand(edi, ebx, times_4, FixedDoubleArray::kHeaderSize)); |
| 444 | __ mov(FieldOperand(edx, HeapNumber::kValueOffset), esi); |
| 445 | __ mov(esi, FieldOperand(edi, ebx, times_4, offset)); |
| 446 | __ mov(FieldOperand(edx, HeapNumber::kValueOffset + kPointerSize), esi); |
| 447 | __ mov(FieldOperand(eax, ebx, times_2, FixedArray::kHeaderSize), edx); |
| 448 | __ mov(esi, ebx); |
| 449 | __ RecordWriteArray(eax, edx, esi, kDontSaveFPRegs, EMIT_REMEMBERED_SET, |
| 450 | OMIT_SMI_CHECK); |
| 451 | __ jmp(&entry, Label::kNear); |
| 452 | |
| 453 | // Replace the-hole NaN with the-hole pointer. |
| 454 | __ bind(&convert_hole); |
| 455 | __ mov(FieldOperand(eax, ebx, times_2, FixedArray::kHeaderSize), |
| 456 | masm->isolate()->factory()->the_hole_value()); |
| 457 | |
| 458 | __ bind(&entry); |
| 459 | __ sub(ebx, Immediate(Smi::FromInt(1))); |
| 460 | __ j(not_sign, &loop); |
| 461 | |
| 462 | __ pop(ebx); |
| 463 | __ pop(edx); |
| 464 | // ebx: target map |
| 465 | // edx: receiver |
| 466 | // Set transitioned map. |
| 467 | __ mov(FieldOperand(edx, HeapObject::kMapOffset), ebx); |
| 468 | __ RecordWriteField(edx, HeapObject::kMapOffset, ebx, edi, kDontSaveFPRegs, |
| 469 | OMIT_REMEMBERED_SET, OMIT_SMI_CHECK); |
| 470 | // Replace receiver's backing store with newly created and filled FixedArray. |
| 471 | __ mov(FieldOperand(edx, JSObject::kElementsOffset), eax); |
| 472 | __ RecordWriteField(edx, JSObject::kElementsOffset, eax, edi, kDontSaveFPRegs, |
| 473 | EMIT_REMEMBERED_SET, OMIT_SMI_CHECK); |
| 474 | |
| 475 | // Restore registers. |
| 476 | __ pop(eax); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 477 | __ pop(esi); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 478 | |
| 479 | __ bind(&success); |
| 480 | } |
| 481 | |
| 482 | |
| 483 | void StringCharLoadGenerator::Generate(MacroAssembler* masm, |
| 484 | Factory* factory, |
| 485 | Register string, |
| 486 | Register index, |
| 487 | Register result, |
| 488 | Label* call_runtime) { |
| 489 | // Fetch the instance type of the receiver into result register. |
| 490 | __ mov(result, FieldOperand(string, HeapObject::kMapOffset)); |
| 491 | __ movzx_b(result, FieldOperand(result, Map::kInstanceTypeOffset)); |
| 492 | |
| 493 | // We need special handling for indirect strings. |
| 494 | Label check_sequential; |
| 495 | __ test(result, Immediate(kIsIndirectStringMask)); |
| 496 | __ j(zero, &check_sequential, Label::kNear); |
| 497 | |
| 498 | // Dispatch on the indirect string shape: slice or cons. |
| 499 | Label cons_string; |
| 500 | __ test(result, Immediate(kSlicedNotConsMask)); |
| 501 | __ j(zero, &cons_string, Label::kNear); |
| 502 | |
| 503 | // Handle slices. |
| 504 | Label indirect_string_loaded; |
| 505 | __ mov(result, FieldOperand(string, SlicedString::kOffsetOffset)); |
| 506 | __ SmiUntag(result); |
| 507 | __ add(index, result); |
| 508 | __ mov(string, FieldOperand(string, SlicedString::kParentOffset)); |
| 509 | __ jmp(&indirect_string_loaded, Label::kNear); |
| 510 | |
| 511 | // Handle cons strings. |
| 512 | // Check whether the right hand side is the empty string (i.e. if |
| 513 | // this is really a flat string in a cons string). If that is not |
| 514 | // the case we would rather go to the runtime system now to flatten |
| 515 | // the string. |
| 516 | __ bind(&cons_string); |
| 517 | __ cmp(FieldOperand(string, ConsString::kSecondOffset), |
| 518 | Immediate(factory->empty_string())); |
| 519 | __ j(not_equal, call_runtime); |
| 520 | __ mov(string, FieldOperand(string, ConsString::kFirstOffset)); |
| 521 | |
| 522 | __ bind(&indirect_string_loaded); |
| 523 | __ mov(result, FieldOperand(string, HeapObject::kMapOffset)); |
| 524 | __ movzx_b(result, FieldOperand(result, Map::kInstanceTypeOffset)); |
| 525 | |
| 526 | // Distinguish sequential and external strings. Only these two string |
| 527 | // representations can reach here (slices and flat cons strings have been |
| 528 | // reduced to the underlying sequential or external string). |
| 529 | Label seq_string; |
| 530 | __ bind(&check_sequential); |
| 531 | STATIC_ASSERT(kSeqStringTag == 0); |
| 532 | __ test(result, Immediate(kStringRepresentationMask)); |
| 533 | __ j(zero, &seq_string, Label::kNear); |
| 534 | |
| 535 | // Handle external strings. |
| 536 | Label one_byte_external, done; |
| 537 | if (FLAG_debug_code) { |
| 538 | // Assert that we do not have a cons or slice (indirect strings) here. |
| 539 | // Sequential strings have already been ruled out. |
| 540 | __ test(result, Immediate(kIsIndirectStringMask)); |
| 541 | __ Assert(zero, kExternalStringExpectedButNotFound); |
| 542 | } |
| 543 | // Rule out short external strings. |
| 544 | STATIC_ASSERT(kShortExternalStringTag != 0); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 545 | __ test_b(result, Immediate(kShortExternalStringMask)); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 546 | __ j(not_zero, call_runtime); |
| 547 | // Check encoding. |
| 548 | STATIC_ASSERT(kTwoByteStringTag == 0); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 549 | __ test_b(result, Immediate(kStringEncodingMask)); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 550 | __ mov(result, FieldOperand(string, ExternalString::kResourceDataOffset)); |
| 551 | __ j(not_equal, &one_byte_external, Label::kNear); |
| 552 | // Two-byte string. |
| 553 | __ movzx_w(result, Operand(result, index, times_2, 0)); |
| 554 | __ jmp(&done, Label::kNear); |
| 555 | __ bind(&one_byte_external); |
| 556 | // One-byte string. |
| 557 | __ movzx_b(result, Operand(result, index, times_1, 0)); |
| 558 | __ jmp(&done, Label::kNear); |
| 559 | |
| 560 | // Dispatch on the encoding: one-byte or two-byte. |
| 561 | Label one_byte; |
| 562 | __ bind(&seq_string); |
| 563 | STATIC_ASSERT((kStringEncodingMask & kOneByteStringTag) != 0); |
| 564 | STATIC_ASSERT((kStringEncodingMask & kTwoByteStringTag) == 0); |
| 565 | __ test(result, Immediate(kStringEncodingMask)); |
| 566 | __ j(not_zero, &one_byte, Label::kNear); |
| 567 | |
| 568 | // Two-byte string. |
| 569 | // Load the two-byte character code into the result register. |
| 570 | __ movzx_w(result, FieldOperand(string, |
| 571 | index, |
| 572 | times_2, |
| 573 | SeqTwoByteString::kHeaderSize)); |
| 574 | __ jmp(&done, Label::kNear); |
| 575 | |
| 576 | // One-byte string. |
| 577 | // Load the byte into the result register. |
| 578 | __ bind(&one_byte); |
| 579 | __ movzx_b(result, FieldOperand(string, |
| 580 | index, |
| 581 | times_1, |
| 582 | SeqOneByteString::kHeaderSize)); |
| 583 | __ bind(&done); |
| 584 | } |
| 585 | |
| 586 | |
| 587 | #undef __ |
| 588 | |
| 589 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 590 | CodeAgingHelper::CodeAgingHelper(Isolate* isolate) { |
| 591 | USE(isolate); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 592 | DCHECK(young_sequence_.length() == kNoCodeAgeSequenceLength); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 593 | CodePatcher patcher(isolate, young_sequence_.start(), |
| 594 | young_sequence_.length()); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 595 | patcher.masm()->push(ebp); |
| 596 | patcher.masm()->mov(ebp, esp); |
| 597 | patcher.masm()->push(esi); |
| 598 | patcher.masm()->push(edi); |
| 599 | } |
| 600 | |
| 601 | |
| 602 | #ifdef DEBUG |
| 603 | bool CodeAgingHelper::IsOld(byte* candidate) const { |
| 604 | return *candidate == kCallOpcode; |
| 605 | } |
| 606 | #endif |
| 607 | |
| 608 | |
| 609 | bool Code::IsYoungSequence(Isolate* isolate, byte* sequence) { |
| 610 | bool result = isolate->code_aging_helper()->IsYoung(sequence); |
| 611 | DCHECK(result || isolate->code_aging_helper()->IsOld(sequence)); |
| 612 | return result; |
| 613 | } |
| 614 | |
| 615 | |
| 616 | void Code::GetCodeAgeAndParity(Isolate* isolate, byte* sequence, Age* age, |
| 617 | MarkingParity* parity) { |
| 618 | if (IsYoungSequence(isolate, sequence)) { |
| 619 | *age = kNoAgeCodeAge; |
| 620 | *parity = NO_MARKING_PARITY; |
| 621 | } else { |
| 622 | sequence++; // Skip the kCallOpcode byte |
| 623 | Address target_address = sequence + *reinterpret_cast<int*>(sequence) + |
| 624 | Assembler::kCallTargetAddressOffset; |
| 625 | Code* stub = GetCodeFromTargetAddress(target_address); |
| 626 | GetCodeAgeAndParity(stub, age, parity); |
| 627 | } |
| 628 | } |
| 629 | |
| 630 | |
| 631 | void Code::PatchPlatformCodeAge(Isolate* isolate, |
| 632 | byte* sequence, |
| 633 | Code::Age age, |
| 634 | MarkingParity parity) { |
| 635 | uint32_t young_length = isolate->code_aging_helper()->young_sequence_length(); |
| 636 | if (age == kNoAgeCodeAge) { |
| 637 | isolate->code_aging_helper()->CopyYoungSequenceTo(sequence); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 638 | Assembler::FlushICache(isolate, sequence, young_length); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 639 | } else { |
| 640 | Code* stub = GetCodeAgeStub(isolate, age, parity); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 641 | CodePatcher patcher(isolate, sequence, young_length); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 642 | patcher.masm()->call(stub->instruction_start(), RelocInfo::NONE32); |
| 643 | } |
| 644 | } |
| 645 | |
| 646 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 647 | } // namespace internal |
| 648 | } // namespace v8 |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 649 | |
| 650 | #endif // V8_TARGET_ARCH_X87 |