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1 // Copyright 2012 the V8 project authors. All rights reserved. | 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 | 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 #include "src/frames.h" | 5 #include "src/frames.h" |
6 | 6 |
7 #include <sstream> | 7 #include <sstream> |
8 | 8 |
9 #include "src/v8.h" | 9 #include "src/v8.h" |
10 | 10 |
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1527 } | 1527 } |
1528 | 1528 |
1529 | 1529 |
1530 // ------------------------------------------------------------------------- | 1530 // ------------------------------------------------------------------------- |
1531 | 1531 |
1532 | 1532 |
1533 void StackHandler::Unwind(Isolate* isolate, | 1533 void StackHandler::Unwind(Isolate* isolate, |
1534 FixedArray* array, | 1534 FixedArray* array, |
1535 int offset, | 1535 int offset, |
1536 int previous_handler_offset) const { | 1536 int previous_handler_offset) const { |
1537 STATIC_ASSERT(StackHandlerConstants::kSlotCount >= 5); | 1537 STATIC_ASSERT(StackHandlerConstants::kSlotCount >= 4); |
1538 DCHECK_LE(0, offset); | 1538 DCHECK_LE(0, offset); |
1539 DCHECK_GE(array->length(), offset + StackHandlerConstants::kSlotCount); | 1539 DCHECK_GE(array->length(), offset + StackHandlerConstants::kSlotCount); |
1540 // Unwinding a stack handler into an array chains it in the opposite | 1540 // Unwinding a stack handler into an array chains it in the opposite |
1541 // direction, re-using the "next" slot as a "previous" link, so that stack | 1541 // direction, re-using the "next" slot as a "previous" link, so that stack |
1542 // handlers can be later re-wound in the correct order. Decode the "state" | 1542 // handlers can be later re-wound in the correct order. Decode the "state" |
1543 // slot into "index" and "kind" and store them separately, using the fp slot. | 1543 // slot into "index" and "kind" and store them separately, using the fp slot. |
1544 array->set(offset, Smi::FromInt(previous_handler_offset)); // next | 1544 array->set(offset, Smi::FromInt(previous_handler_offset)); // next |
1545 array->set(offset + 1, *code_address()); // code | 1545 array->set(offset + 1, Smi::FromInt(static_cast<int>(index()))); // state |
1546 array->set(offset + 2, Smi::FromInt(static_cast<int>(index()))); // state | 1546 array->set(offset + 2, *context_address()); // context |
1547 array->set(offset + 3, *context_address()); // context | 1547 array->set(offset + 3, Smi::FromInt(static_cast<int>(kind()))); // fp |
1548 array->set(offset + 4, Smi::FromInt(static_cast<int>(kind()))); // fp | |
1549 | 1548 |
1550 *isolate->handler_address() = next()->address(); | 1549 *isolate->handler_address() = next()->address(); |
1551 } | 1550 } |
1552 | 1551 |
1553 | 1552 |
1554 int StackHandler::Rewind(Isolate* isolate, | 1553 int StackHandler::Rewind(Isolate* isolate, |
1555 FixedArray* array, | 1554 FixedArray* array, |
1556 int offset, | 1555 int offset, |
1557 Address fp) { | 1556 Address fp) { |
1558 STATIC_ASSERT(StackHandlerConstants::kSlotCount >= 5); | 1557 STATIC_ASSERT(StackHandlerConstants::kSlotCount >= 4); |
1559 DCHECK_LE(0, offset); | 1558 DCHECK_LE(0, offset); |
1560 DCHECK_GE(array->length(), offset + StackHandlerConstants::kSlotCount); | 1559 DCHECK_GE(array->length(), offset + StackHandlerConstants::kSlotCount); |
1561 Smi* prev_handler_offset = Smi::cast(array->get(offset)); | 1560 Smi* prev_handler_offset = Smi::cast(array->get(offset)); |
1562 Code* code = Code::cast(array->get(offset + 1)); | 1561 Smi* smi_index = Smi::cast(array->get(offset + 1)); |
1563 Smi* smi_index = Smi::cast(array->get(offset + 2)); | 1562 Object* context = array->get(offset + 2); |
1564 Object* context = array->get(offset + 3); | 1563 Smi* smi_kind = Smi::cast(array->get(offset + 3)); |
1565 Smi* smi_kind = Smi::cast(array->get(offset + 4)); | |
1566 | 1564 |
1567 unsigned state = KindField::encode(static_cast<Kind>(smi_kind->value())) | | 1565 unsigned state = KindField::encode(static_cast<Kind>(smi_kind->value())) | |
1568 IndexField::encode(static_cast<unsigned>(smi_index->value())); | 1566 IndexField::encode(static_cast<unsigned>(smi_index->value())); |
1569 | 1567 |
1570 Memory::Address_at(address() + StackHandlerConstants::kNextOffset) = | 1568 Memory::Address_at(address() + StackHandlerConstants::kNextOffset) = |
1571 *isolate->handler_address(); | 1569 *isolate->handler_address(); |
1572 Memory::Object_at(address() + StackHandlerConstants::kCodeOffset) = code; | |
1573 Memory::uintptr_at(address() + StackHandlerConstants::kStateOffset) = state; | 1570 Memory::uintptr_at(address() + StackHandlerConstants::kStateOffset) = state; |
1574 Memory::Object_at(address() + StackHandlerConstants::kContextOffset) = | 1571 Memory::Object_at(address() + StackHandlerConstants::kContextOffset) = |
1575 context; | 1572 context; |
1576 SetFp(address() + StackHandlerConstants::kFPOffset, fp); | 1573 SetFp(address() + StackHandlerConstants::kFPOffset, fp); |
1577 | 1574 |
1578 *isolate->handler_address() = address(); | 1575 *isolate->handler_address() = address(); |
1579 | 1576 |
1580 return prev_handler_offset->value(); | 1577 return prev_handler_offset->value(); |
1581 } | 1578 } |
1582 | 1579 |
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1639 ZoneList<StackFrame*> list(10, zone); | 1636 ZoneList<StackFrame*> list(10, zone); |
1640 for (StackFrameIterator it(isolate); !it.done(); it.Advance()) { | 1637 for (StackFrameIterator it(isolate); !it.done(); it.Advance()) { |
1641 StackFrame* frame = AllocateFrameCopy(it.frame(), zone); | 1638 StackFrame* frame = AllocateFrameCopy(it.frame(), zone); |
1642 list.Add(frame, zone); | 1639 list.Add(frame, zone); |
1643 } | 1640 } |
1644 return list.ToVector(); | 1641 return list.ToVector(); |
1645 } | 1642 } |
1646 | 1643 |
1647 | 1644 |
1648 } } // namespace v8::internal | 1645 } } // namespace v8::internal |
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