37680d6563
Instead of having feedback vector as a subtype of FixedArray with reserved slots, make it a first-class variable-sized object with a fixed-size header. This allows us to compress counters to ints in the header, rather than forcing them to be Smis. Cq-Include-Trybots: master.tryserver.chromium.linux:linux_chromium_rel_ng Change-Id: Icc5f088ffbc2e2651b845bc71ea42060639e3e48 Reviewed-on: https://chromium-review.googlesource.com/585129 Commit-Queue: Leszek Swirski <leszeks@chromium.org> Reviewed-by: Michael Stanton <mvstanton@chromium.org> Reviewed-by: Ross McIlroy <rmcilroy@chromium.org> Reviewed-by: Michael Lippautz <mlippautz@chromium.org> Cr-Commit-Position: refs/heads/master@{#46935}
60 lines
1.8 KiB
C++
60 lines
1.8 KiB
C++
// Copyright 2015 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef V8_TEST_FEEDBACK_VECTOR_H_
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#define V8_TEST_FEEDBACK_VECTOR_H_
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#include "src/objects.h"
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#include "src/objects/shared-function-info.h"
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namespace v8 {
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namespace internal {
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// Helper class that allows to write tests in a slot size independent manner.
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// Use helper.slot(X) to get X'th slot identifier.
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class FeedbackVectorHelper {
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public:
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explicit FeedbackVectorHelper(Handle<FeedbackVector> vector)
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: vector_(vector) {
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int slot_count = vector->length();
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slots_.reserve(slot_count);
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FeedbackMetadataIterator iter(vector->metadata());
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while (iter.HasNext()) {
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FeedbackSlot slot = iter.Next();
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slots_.push_back(slot);
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}
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}
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Handle<FeedbackVector> vector() { return vector_; }
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// Returns slot identifier by numerical index.
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FeedbackSlot slot(int index) const { return slots_[index]; }
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// Returns the number of slots in the feedback vector.
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int slot_count() const { return static_cast<int>(slots_.size()); }
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private:
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Handle<FeedbackVector> vector_;
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std::vector<FeedbackSlot> slots_;
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};
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template <typename Spec>
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Handle<FeedbackVector> NewFeedbackVector(Isolate* isolate, Spec* spec) {
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Handle<FeedbackMetadata> metadata = FeedbackMetadata::New(isolate, spec);
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Handle<SharedFunctionInfo> shared = isolate->factory()->NewSharedFunctionInfo(
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isolate->factory()->empty_string(), MaybeHandle<Code>(), false);
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shared->set_feedback_metadata(*metadata);
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return FeedbackVector::New(isolate, shared);
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}
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template <typename Spec>
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Handle<FeedbackMetadata> NewFeedbackMetadata(Isolate* isolate, Spec* spec) {
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return FeedbackMetadata::New(isolate, spec);
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}
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} // namespace internal
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} // namespace v8
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#endif
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