// 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 {

@if(V8_ENABLE_LEAPTIERING) tiering_in_progress: bool: 1 bit;

@ifnot(V8_ENABLE_LEAPTIERING) 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.

@ifnot(V8_ENABLE_LEAPTIERING) 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).

@ifnot(V8_ENABLE_LEAPTIERING) maybe_has_maglev_code: bool: 1 bit;

@ifnot(V8_ENABLE_LEAPTIERING) maybe_has_turbofan_code: bool: 1 bit;

osr_tiering_in_progress: bool: 1 bit;

interrupt_budget_reset_by_ic_change: bool: 1 bit;

@if(V8_ENABLE_LEAPTIERING) all_your_bits_are_belong_to_jgruber:

uint32: 13 bit;

@ifnot(V8_ENABLE_LEAPTIERING) all_your_bits_are_belong_to_jgruber:

uint32: 8 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;

}

@cppObjectLayoutDefinition

extern class ClosureFeedbackCellArray extends HeapObject {

const length: Smi;

objects[length]: FeedbackCell;

}

@generateBodyDescriptor

extern class FeedbackVector extends HeapObject {

const length: int32;

invocation_count: int32;

@if(TAGGED_SIZE_8_BYTES) optional_padding: uint32;

invocation_count_before_stable: uint8;

osr_state: OsrState;

flags: FeedbackVectorFlags;

shared_function_info: SharedFunctionInfo;

closure_feedback_cell_array: ClosureFeedbackCellArray;

parent_feedback_cell: FeedbackCell;

@ifnot(V8_ENABLE_LEAPTIERING) maybe_optimized_code: Weak<CodeWrapper>;

@cppRelaxedLoad @cppRelaxedStore raw_feedback_slots[length]: MaybeObject;

}

extern class FeedbackMetadata extends HeapObject;