| // Copyright 2012 the V8 project authors. All rights reserved. |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following |
| // disclaimer in the documentation and/or other materials provided |
| // with the distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived |
| // from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #include "elements-kind.h" |
| |
| #include "api.h" |
| #include "elements.h" |
| #include "objects.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| |
| const char* ElementsKindToString(ElementsKind kind) { |
| ElementsAccessor* accessor = ElementsAccessor::ForKind(kind); |
| return accessor->name(); |
| } |
| |
| |
| void PrintElementsKind(FILE* out, ElementsKind kind) { |
| PrintF(out, "%s", ElementsKindToString(kind)); |
| } |
| |
| |
| ElementsKind GetInitialFastElementsKind() { |
| if (FLAG_packed_arrays) { |
| return FAST_SMI_ELEMENTS; |
| } else { |
| return FAST_HOLEY_SMI_ELEMENTS; |
| } |
| } |
| |
| |
| struct InitializeFastElementsKindSequence { |
| static void Construct( |
| ElementsKind** fast_elements_kind_sequence_ptr) { |
| ElementsKind* fast_elements_kind_sequence = |
| new ElementsKind[kFastElementsKindCount]; |
| *fast_elements_kind_sequence_ptr = fast_elements_kind_sequence; |
| STATIC_ASSERT(FAST_SMI_ELEMENTS == FIRST_FAST_ELEMENTS_KIND); |
| fast_elements_kind_sequence[0] = FAST_SMI_ELEMENTS; |
| fast_elements_kind_sequence[1] = FAST_HOLEY_SMI_ELEMENTS; |
| fast_elements_kind_sequence[2] = FAST_DOUBLE_ELEMENTS; |
| fast_elements_kind_sequence[3] = FAST_HOLEY_DOUBLE_ELEMENTS; |
| fast_elements_kind_sequence[4] = FAST_ELEMENTS; |
| fast_elements_kind_sequence[5] = FAST_HOLEY_ELEMENTS; |
| } |
| }; |
| |
| |
| static LazyInstance<ElementsKind*, |
| InitializeFastElementsKindSequence>::type |
| fast_elements_kind_sequence = LAZY_INSTANCE_INITIALIZER; |
| |
| |
| ElementsKind GetFastElementsKindFromSequenceIndex(int sequence_number) { |
| ASSERT(sequence_number >= 0 && |
| sequence_number < kFastElementsKindCount); |
| return fast_elements_kind_sequence.Get()[sequence_number]; |
| } |
| |
| |
| int GetSequenceIndexFromFastElementsKind(ElementsKind elements_kind) { |
| for (int i = 0; i < kFastElementsKindCount; ++i) { |
| if (fast_elements_kind_sequence.Get()[i] == elements_kind) { |
| return i; |
| } |
| } |
| UNREACHABLE(); |
| return 0; |
| } |
| |
| |
| ElementsKind GetNextMoreGeneralFastElementsKind(ElementsKind elements_kind, |
| bool allow_only_packed) { |
| ASSERT(IsFastElementsKind(elements_kind)); |
| ASSERT(elements_kind != TERMINAL_FAST_ELEMENTS_KIND); |
| while (true) { |
| int index = |
| GetSequenceIndexFromFastElementsKind(elements_kind) + 1; |
| elements_kind = GetFastElementsKindFromSequenceIndex(index); |
| if (!IsFastHoleyElementsKind(elements_kind) || !allow_only_packed) { |
| return elements_kind; |
| } |
| } |
| UNREACHABLE(); |
| return TERMINAL_FAST_ELEMENTS_KIND; |
| } |
| |
| |
| bool IsMoreGeneralElementsKindTransition(ElementsKind from_kind, |
| ElementsKind to_kind) { |
| switch (from_kind) { |
| case FAST_SMI_ELEMENTS: |
| return to_kind != FAST_SMI_ELEMENTS; |
| case FAST_HOLEY_SMI_ELEMENTS: |
| return to_kind != FAST_SMI_ELEMENTS && |
| to_kind != FAST_HOLEY_SMI_ELEMENTS; |
| case FAST_DOUBLE_ELEMENTS: |
| return to_kind != FAST_SMI_ELEMENTS && |
| to_kind != FAST_HOLEY_SMI_ELEMENTS && |
| to_kind != FAST_DOUBLE_ELEMENTS; |
| case FAST_HOLEY_DOUBLE_ELEMENTS: |
| return to_kind == FAST_ELEMENTS || |
| to_kind == FAST_HOLEY_ELEMENTS; |
| case FAST_ELEMENTS: |
| return to_kind == FAST_HOLEY_ELEMENTS; |
| case FAST_HOLEY_ELEMENTS: |
| return false; |
| default: |
| return false; |
| } |
| } |
| |
| |
| } } // namespace v8::internal |