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Side by Side Diff: src/s390/code-stubs-s390.cc

Issue 2625073002: Revert of Internalize strings in-place (Closed)
Patch Set: Created 3 years, 11 months ago
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1 // Copyright 2014 the V8 project authors. All rights reserved. 1 // Copyright 2014 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #if V8_TARGET_ARCH_S390 5 #if V8_TARGET_ARCH_S390
6 6
7 #include "src/code-stubs.h" 7 #include "src/code-stubs.h"
8 #include "src/api-arguments.h" 8 #include "src/api-arguments.h"
9 #include "src/base/bits.h" 9 #include "src/base/bits.h"
10 #include "src/bootstrapper.h" 10 #include "src/bootstrapper.h"
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1364 // and go to (1). Otherwise bail out to runtime. 1364 // and go to (1). Otherwise bail out to runtime.
1365 // (4) Sequential string. Load regexp code according to encoding. 1365 // (4) Sequential string. Load regexp code according to encoding.
1366 // (E) Carry on. 1366 // (E) Carry on.
1367 /// [...] 1367 /// [...]
1368 1368
1369 // Deferred code at the end of the stub: 1369 // Deferred code at the end of the stub:
1370 // (5) Long external string? If not, go to (7). 1370 // (5) Long external string? If not, go to (7).
1371 // (6) External string. Make it, offset-wise, look like a sequential string. 1371 // (6) External string. Make it, offset-wise, look like a sequential string.
1372 // Go to (4). 1372 // Go to (4).
1373 // (7) Short external string or not a string? If yes, bail out to runtime. 1373 // (7) Short external string or not a string? If yes, bail out to runtime.
1374 // (8) Sliced or thin string. Replace subject with parent. Go to (1). 1374 // (8) Sliced string. Replace subject with parent. Go to (1).
1375 1375
1376 Label seq_string /* 4 */, external_string /* 6 */, check_underlying /* 1 */, 1376 Label seq_string /* 4 */, external_string /* 6 */, check_underlying /* 1 */,
1377 not_seq_nor_cons /* 5 */, not_long_external /* 7 */; 1377 not_seq_nor_cons /* 5 */, not_long_external /* 7 */;
1378 1378
1379 __ bind(&check_underlying); 1379 __ bind(&check_underlying);
1380 __ LoadP(r2, FieldMemOperand(subject, HeapObject::kMapOffset)); 1380 __ LoadP(r2, FieldMemOperand(subject, HeapObject::kMapOffset));
1381 __ LoadlB(r2, FieldMemOperand(r2, Map::kInstanceTypeOffset)); 1381 __ LoadlB(r2, FieldMemOperand(r2, Map::kInstanceTypeOffset));
1382 1382
1383 // (1) Sequential string? If yes, go to (4). 1383 // (1) Sequential string? If yes, go to (4).
1384 1384
1385 STATIC_ASSERT((kIsNotStringMask | kStringRepresentationMask | 1385 STATIC_ASSERT((kIsNotStringMask | kStringRepresentationMask |
1386 kShortExternalStringMask) == 0x93); 1386 kShortExternalStringMask) == 0x93);
1387 __ mov(r3, Operand(kIsNotStringMask | kStringRepresentationMask | 1387 __ mov(r3, Operand(kIsNotStringMask | kStringRepresentationMask |
1388 kShortExternalStringMask)); 1388 kShortExternalStringMask));
1389 __ AndP(r3, r2); 1389 __ AndP(r3, r2);
1390 STATIC_ASSERT((kStringTag | kSeqStringTag) == 0); 1390 STATIC_ASSERT((kStringTag | kSeqStringTag) == 0);
1391 __ beq(&seq_string, Label::kNear); // Go to (4). 1391 __ beq(&seq_string, Label::kNear); // Go to (4).
1392 1392
1393 // (2) Sequential or cons? If not, go to (5). 1393 // (2) Sequential or cons? If not, go to (5).
1394 STATIC_ASSERT(kConsStringTag < kExternalStringTag); 1394 STATIC_ASSERT(kConsStringTag < kExternalStringTag);
1395 STATIC_ASSERT(kSlicedStringTag > kExternalStringTag); 1395 STATIC_ASSERT(kSlicedStringTag > kExternalStringTag);
1396 STATIC_ASSERT(kThinStringTag > kExternalStringTag);
1397 STATIC_ASSERT(kIsNotStringMask > kExternalStringTag); 1396 STATIC_ASSERT(kIsNotStringMask > kExternalStringTag);
1398 STATIC_ASSERT(kShortExternalStringTag > kExternalStringTag); 1397 STATIC_ASSERT(kShortExternalStringTag > kExternalStringTag);
1399 STATIC_ASSERT(kExternalStringTag < 0xffffu); 1398 STATIC_ASSERT(kExternalStringTag < 0xffffu);
1400 __ CmpP(r3, Operand(kExternalStringTag)); 1399 __ CmpP(r3, Operand(kExternalStringTag));
1401 __ bge(&not_seq_nor_cons); // Go to (5). 1400 __ bge(&not_seq_nor_cons); // Go to (5).
1402 1401
1403 // (3) Cons string. Check that it's flat. 1402 // (3) Cons string. Check that it's flat.
1404 // Replace subject with first string and reload instance type. 1403 // Replace subject with first string and reload instance type.
1405 __ LoadP(r2, FieldMemOperand(subject, ConsString::kSecondOffset)); 1404 __ LoadP(r2, FieldMemOperand(subject, ConsString::kSecondOffset));
1406 __ CompareRoot(r2, Heap::kempty_stringRootIndex); 1405 __ CompareRoot(r2, Heap::kempty_stringRootIndex);
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1674 Operand(SeqTwoByteString::kHeaderSize - kHeapObjectTag)); 1673 Operand(SeqTwoByteString::kHeaderSize - kHeapObjectTag));
1675 __ b(&seq_string); // Go to (4). 1674 __ b(&seq_string); // Go to (4).
1676 1675
1677 // (7) Short external string or not a string? If yes, bail out to runtime. 1676 // (7) Short external string or not a string? If yes, bail out to runtime.
1678 __ bind(&not_long_external); 1677 __ bind(&not_long_external);
1679 STATIC_ASSERT(kNotStringTag != 0 && kShortExternalStringTag != 0); 1678 STATIC_ASSERT(kNotStringTag != 0 && kShortExternalStringTag != 0);
1680 __ mov(r0, Operand(kIsNotStringMask | kShortExternalStringMask)); 1679 __ mov(r0, Operand(kIsNotStringMask | kShortExternalStringMask));
1681 __ AndP(r0, r3); 1680 __ AndP(r0, r3);
1682 __ bne(&runtime); 1681 __ bne(&runtime);
1683 1682
1684 // (8) Sliced or thin string. Replace subject with parent. Go to (4). 1683 // (8) Sliced string. Replace subject with parent. Go to (4).
1685 Label thin_string;
1686 __ CmpP(r3, Operand(kThinStringTag));
1687 __ beq(&thin_string);
1688 // Load offset into ip and replace subject string with parent. 1684 // Load offset into ip and replace subject string with parent.
1689 __ LoadP(ip, FieldMemOperand(subject, SlicedString::kOffsetOffset)); 1685 __ LoadP(ip, FieldMemOperand(subject, SlicedString::kOffsetOffset));
1690 __ SmiUntag(ip); 1686 __ SmiUntag(ip);
1691 __ LoadP(subject, FieldMemOperand(subject, SlicedString::kParentOffset)); 1687 __ LoadP(subject, FieldMemOperand(subject, SlicedString::kParentOffset));
1692 __ b(&check_underlying); // Go to (4). 1688 __ b(&check_underlying); // Go to (4).
1693
1694 __ bind(&thin_string);
1695 __ LoadP(subject, FieldMemOperand(subject, ThinString::kActualOffset));
1696 __ b(&check_underlying); // Go to (4).
1697 #endif // V8_INTERPRETED_REGEXP 1689 #endif // V8_INTERPRETED_REGEXP
1698 } 1690 }
1699 1691
1700 static void CallStubInRecordCallTarget(MacroAssembler* masm, CodeStub* stub) { 1692 static void CallStubInRecordCallTarget(MacroAssembler* masm, CodeStub* stub) {
1701 // r2 : number of arguments to the construct function 1693 // r2 : number of arguments to the construct function
1702 // r3 : the function to call 1694 // r3 : the function to call
1703 // r4 : feedback vector 1695 // r4 : feedback vector
1704 // r5 : slot in feedback vector (Smi) 1696 // r5 : slot in feedback vector (Smi)
1705 FrameScope scope(masm, StackFrame::INTERNAL); 1697 FrameScope scope(masm, StackFrame::INTERNAL);
1706 1698
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4359 CallApiFunctionAndReturn(masm, api_function_address, thunk_ref, 4351 CallApiFunctionAndReturn(masm, api_function_address, thunk_ref,
4360 kStackUnwindSpace, NULL, return_value_operand, NULL); 4352 kStackUnwindSpace, NULL, return_value_operand, NULL);
4361 } 4353 }
4362 4354
4363 #undef __ 4355 #undef __
4364 4356
4365 } // namespace internal 4357 } // namespace internal
4366 } // namespace v8 4358 } // namespace v8
4367 4359
4368 #endif // V8_TARGET_ARCH_S390 4360 #endif // V8_TARGET_ARCH_S390
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