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// Copyright 2019 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
type TieringState extends uint16 constexpr 'TieringState';
bitfield struct FeedbackVectorFlags extends uint16 {
tiering_state: TieringState: 3 bit;
// Set for non-executed functions with --log-function-events in order to
// log first-executions of code objects with minimal overhead.
log_next_execution: bool: 1 bit;
// Whether the maybe_optimized_code field contains a code object. 'maybe',
// because they flag may lag behind the actual state of the world (it will be
// updated in time).
maybe_has_maglev_code: bool: 1 bit;
maybe_has_turbofan_code: bool: 1 bit;
// Just one bit, since only {kNone,kInProgress} are relevant for OSR.
osr_tiering_state: TieringState: 1 bit;
all_your_bits_are_belong_to_jgruber: uint32: 9 bit;
}
bitfield struct OsrState extends uint8 {
// The layout is chosen s.t. osr_urgency and
// maybe_has_(maglev|turbofan)_osr_code can be loaded with a single load
// (i.e. no masking required).
osr_urgency: uint32: 3 bit;
maybe_has_maglev_osr_code: bool: 1 bit;
maybe_has_turbofan_osr_code: bool: 1 bit;
// In order to have fast OSR checks in Ignition and Sparkplug, these bits
// should remain 0. That way, the OSR check can be implemented as a single
// comparison.
dont_use_these_bits_unless_beneficial: uint32: 3 bit;
}
@generateBodyDescriptor
extern class FeedbackVector extends HeapObject {
const length: int32;
invocation_count: int32;
@if(TAGGED_SIZE_8_BYTES) optional_padding: uint32;
// TODO(jgruber): These bits are available.
placeholder0: uint8;
osr_state: OsrState;
flags: FeedbackVectorFlags;
shared_function_info: SharedFunctionInfo;
closure_feedback_cell_array: ClosureFeedbackCellArray;
parent_feedback_cell: FeedbackCell;
maybe_optimized_code: Weak<Code>;
@cppRelaxedLoad raw_feedback_slots[length]: MaybeObject;
}
extern class FeedbackMetadata extends HeapObject;
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