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Unified Diff: src/elements-kind.cc

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.cc
diff --git a/src/elements-kind.cc b/src/elements-kind.cc
new file mode 100644
index 0000000000000000000000000000000000000000..655a23bf1e497aa29a51c12c4546aa6ab6acf7bc
--- /dev/null
+++ b/src/elements-kind.cc
@@ -0,0 +1,134 @@
+// 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 {
+
+
+void PrintElementsKind(FILE* out, ElementsKind kind) {
+ ElementsAccessor* accessor = ElementsAccessor::ForKind(kind);
+ PrintF(out, "%s", accessor->name());
+}
+
+
+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
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