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Unified Diff: src/elements-kind.h

Issue 10170030: Implement tracking and optimizations of packed arrays (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Review feedback Created 8 years, 7 months ago
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Index: src/elements-kind.h
diff --git a/src/elements-kind.h b/src/elements-kind.h
new file mode 100644
index 0000000000000000000000000000000000000000..47a146d1c11e1375d8849ce687ebb7dc74315e79
--- /dev/null
+++ b/src/elements-kind.h
@@ -0,0 +1,209 @@
+// 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;
+
+void PrintElementsKind(FILE* out, ElementsKind kind);
+
+ElementsKind GetInitialFastElementsKind();
+
+ElementsKind GetFastElementsKindFromSequenceIndex(int sequence_index);
+
+int GetSequenceIndexFromFastElementsKind(ElementsKind 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 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 elements_kind != TERMINAL_FAST_ELEMENTS_KIND &&
+ (!allow_only_packed || elements_kind != FAST_ELEMENTS);
+}
+
+
+} } // namespace v8::internal
+
+#endif // V8_ELEMENTS_KIND_H_
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