v8/src/elements-kind.h

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// 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.
#ifndef V8_ELEMENTS_KIND_H_
#define V8_ELEMENTS_KIND_H_
#include "v8checks.h"
namespace v8 {
namespace internal {
enum ElementsKind {
// The "fast" kind for elements that only contain SMI values. Must be first
// to make it possible to efficiently check maps for this kind.
FAST_SMI_ELEMENTS,
FAST_HOLEY_SMI_ELEMENTS,
// The "fast" kind for tagged values. Must be second to make it possible to
// efficiently check maps for this and the FAST_SMI_ONLY_ELEMENTS kind
// together at once.
FAST_ELEMENTS,
FAST_HOLEY_ELEMENTS,
// The "fast" kind for unwrapped, non-tagged double values.
FAST_DOUBLE_ELEMENTS,
FAST_HOLEY_DOUBLE_ELEMENTS,
// The "slow" kind.
DICTIONARY_ELEMENTS,
NON_STRICT_ARGUMENTS_ELEMENTS,
// The "fast" kind for external arrays
EXTERNAL_BYTE_ELEMENTS,
EXTERNAL_UNSIGNED_BYTE_ELEMENTS,
EXTERNAL_SHORT_ELEMENTS,
EXTERNAL_UNSIGNED_SHORT_ELEMENTS,
EXTERNAL_INT_ELEMENTS,
EXTERNAL_UNSIGNED_INT_ELEMENTS,
EXTERNAL_FLOAT_ELEMENTS,
EXTERNAL_DOUBLE_ELEMENTS,
EXTERNAL_PIXEL_ELEMENTS,
// Derived constants from ElementsKind
FIRST_ELEMENTS_KIND = FAST_SMI_ELEMENTS,
LAST_ELEMENTS_KIND = EXTERNAL_PIXEL_ELEMENTS,
FIRST_FAST_ELEMENTS_KIND = FAST_SMI_ELEMENTS,
LAST_FAST_ELEMENTS_KIND = FAST_HOLEY_DOUBLE_ELEMENTS,
FIRST_EXTERNAL_ARRAY_ELEMENTS_KIND = EXTERNAL_BYTE_ELEMENTS,
LAST_EXTERNAL_ARRAY_ELEMENTS_KIND = EXTERNAL_PIXEL_ELEMENTS,
TERMINAL_FAST_ELEMENTS_KIND = FAST_HOLEY_ELEMENTS
};
const int kElementsKindCount = LAST_ELEMENTS_KIND - FIRST_ELEMENTS_KIND + 1;
const int kFastElementsKindCount = LAST_FAST_ELEMENTS_KIND -
FIRST_FAST_ELEMENTS_KIND + 1;
const char* ElementsKindToString(ElementsKind kind);
void PrintElementsKind(FILE* out, ElementsKind kind);
ElementsKind GetInitialFastElementsKind();
ElementsKind GetFastElementsKindFromSequenceIndex(int sequence_index);
int GetSequenceIndexFromFastElementsKind(ElementsKind elements_kind);
inline bool IsDictionaryElementsKind(ElementsKind kind) {
return kind == DICTIONARY_ELEMENTS;
}
inline bool IsExternalArrayElementsKind(ElementsKind kind) {
return kind >= FIRST_EXTERNAL_ARRAY_ELEMENTS_KIND &&
kind <= LAST_EXTERNAL_ARRAY_ELEMENTS_KIND;
}
inline bool IsFastElementsKind(ElementsKind kind) {
ASSERT(FIRST_FAST_ELEMENTS_KIND == 0);
return kind <= FAST_HOLEY_DOUBLE_ELEMENTS;
}
inline bool IsFastDoubleElementsKind(ElementsKind kind) {
return kind == FAST_DOUBLE_ELEMENTS ||
kind == FAST_HOLEY_DOUBLE_ELEMENTS;
}
inline bool IsExternalFloatOrDoubleElementsKind(ElementsKind kind) {
return kind == EXTERNAL_DOUBLE_ELEMENTS ||
kind == EXTERNAL_FLOAT_ELEMENTS;
}
inline bool IsDoubleOrFloatElementsKind(ElementsKind kind) {
return IsFastDoubleElementsKind(kind) ||
IsExternalFloatOrDoubleElementsKind(kind);
}
inline bool IsFastSmiOrObjectElementsKind(ElementsKind kind) {
return kind == FAST_SMI_ELEMENTS ||
kind == FAST_HOLEY_SMI_ELEMENTS ||
kind == FAST_ELEMENTS ||
kind == FAST_HOLEY_ELEMENTS;
}
inline bool IsFastSmiElementsKind(ElementsKind kind) {
return kind == FAST_SMI_ELEMENTS ||
kind == FAST_HOLEY_SMI_ELEMENTS;
}
inline bool IsFastObjectElementsKind(ElementsKind kind) {
return kind == FAST_ELEMENTS ||
kind == FAST_HOLEY_ELEMENTS;
}
inline bool IsFastHoleyElementsKind(ElementsKind kind) {
return kind == FAST_HOLEY_SMI_ELEMENTS ||
kind == FAST_HOLEY_DOUBLE_ELEMENTS ||
kind == FAST_HOLEY_ELEMENTS;
}
inline bool IsHoleyElementsKind(ElementsKind kind) {
return IsFastHoleyElementsKind(kind) ||
kind == DICTIONARY_ELEMENTS;
}
inline bool IsFastPackedElementsKind(ElementsKind kind) {
return kind == FAST_SMI_ELEMENTS ||
kind == FAST_DOUBLE_ELEMENTS ||
kind == FAST_ELEMENTS;
}
inline ElementsKind GetPackedElementsKind(ElementsKind holey_kind) {
if (holey_kind == FAST_HOLEY_SMI_ELEMENTS) {
return FAST_SMI_ELEMENTS;
}
if (holey_kind == FAST_HOLEY_DOUBLE_ELEMENTS) {
return FAST_DOUBLE_ELEMENTS;
}
if (holey_kind == FAST_HOLEY_ELEMENTS) {
return FAST_ELEMENTS;
}
return holey_kind;
}
inline ElementsKind GetHoleyElementsKind(ElementsKind packed_kind) {
if (packed_kind == FAST_SMI_ELEMENTS) {
return FAST_HOLEY_SMI_ELEMENTS;
}
if (packed_kind == FAST_DOUBLE_ELEMENTS) {
return FAST_HOLEY_DOUBLE_ELEMENTS;
}
if (packed_kind == FAST_ELEMENTS) {
return FAST_HOLEY_ELEMENTS;
}
return packed_kind;
}
inline ElementsKind FastSmiToObjectElementsKind(ElementsKind from_kind) {
ASSERT(IsFastSmiElementsKind(from_kind));
return (from_kind == FAST_SMI_ELEMENTS)
? FAST_ELEMENTS
: FAST_HOLEY_ELEMENTS;
}
inline bool IsSimpleMapChangeTransition(ElementsKind from_kind,
ElementsKind to_kind) {
return (GetHoleyElementsKind(from_kind) == to_kind) ||
(IsFastSmiElementsKind(from_kind) &&
IsFastObjectElementsKind(to_kind));
}
bool IsMoreGeneralElementsKindTransition(ElementsKind from_kind,
ElementsKind to_kind);
inline bool IsTransitionableFastElementsKind(ElementsKind from_kind) {
return IsFastElementsKind(from_kind) &&
from_kind != TERMINAL_FAST_ELEMENTS_KIND;
}
ElementsKind GetNextMoreGeneralFastElementsKind(ElementsKind elements_kind,
bool allow_only_packed);
inline bool CanTransitionToMoreGeneralFastElementsKind(
ElementsKind elements_kind,
bool allow_only_packed) {
return IsFastElementsKind(elements_kind) &&
(elements_kind != TERMINAL_FAST_ELEMENTS_KIND &&
(!allow_only_packed || elements_kind != FAST_ELEMENTS));
}
} } // namespace v8::internal
#endif // V8_ELEMENTS_KIND_H_