pub struct CompileSubphaseMetric {
  name : String
  parent : String
  duration_us : Int64
} derive(ToJson)

pub(all) enum FunctionCompileStage {
  Optimize
  NativeLowering
  TargetLowering
  RegisterAllocation
  FramePlanning
  Emission
}

pub struct FunctionMetrics {
  func_idx : Int
  func_name : String
  opt_level : Int
  ir_insts_before : Int
  ir_insts_after : Int
  function_compile_us : Int64
  optimize_us : Int64
  lower_us : Int64
  target_lower_us : Int64
  regalloc_us : Int64
  frame_plan_us : Int64
  emit_us : Int64
  compile_subphases : Array[CompileSubphaseMetric]
  code_size : Int
  spill_slots : Int
  spills : Int
  reloads : Int
  reg_moves : Int
  spill_to_spill : Int
  regalloc_loop : RegallocLoopMetric?
  ir_passes : Array[IRPassMetric]
  regalloc_phases : Array[RegallocPhaseMetric]
} derive(ToJson)

pub struct IRPassMetric {
  name : String
  duration_us : Int64
  before_insts : Int
  after_insts : Int
  changed : Bool
  rewrite_attempts : Int?
  rewrite_apps : Int?
  rewrite_created_insts : Int?
  work_done : Int?
  value_lookup_probes : Int?
  budget_exhausted : Bool?
} derive(ToJson)

#alias(PerfTick)
type Instant

pub struct ModuleMetricsReport {
  schema_version : Int
  expected_functions : Int
  module_compile_us : Int64
  compile_subphases : Array[CompileSubphaseMetric]
  functions : Array[FunctionMetrics]
} derive(ToJson)

pub struct RegallocLoopMetric {
  queue_pops : Int
  register_probes : Int
  occupied_segments_scanned : Int
  conflicts : Int
  evictions : Int
  bundle_splits : Int
  second_chance_attempts : Int
  max_queue_length : Int
} derive(ToJson)

pub struct RegallocPhaseMetric {
  name : String
  duration_us : Int64
} derive(ToJson)

fn begin_function(func_idx : Int, func_name : String, opt_level : Int, ir_insts_before : Int) -> Unit

fn clear_milkir_metrics_sink() -> Unit

fn detail_enabled() -> Bool

fn elapsed_us(start : Instant) -> Int64

fn enabled() -> Bool

fn export_json() -> String

fn finish_function(ir_insts_after : Int, code_size : Int) -> Unit

fn install_milkir_metrics_sink() -> Unit

fn instant_elapsed_as_secs_f64(i : Instant) -> Double

fn instant_now() -> Instant

fn record_compile_subphase_us(phase_name : String, duration_us : Int64, parent? : String) -> Unit

fn record_function_compile_us(duration_us : Int64) -> Unit

fn record_ir_pass(pass_name : String, before_insts : Int, after_insts : Int, changed : Bool, duration_us : Int64, rewrite_attempts? : Int?, rewrite_apps? : Int?, rewrite_created_insts? : Int?, work_done? : Int?, value_lookup_probes? : Int?, budget_exhausted? : Bool?) -> Unit

fn record_module_subphase_us(phase_name : String, duration_us : Int64) -> Unit

fn record_regalloc_loop(queue_pops : Int, register_probes : Int, occupied_segments_scanned : Int, conflicts : Int, evictions : Int, bundle_splits : Int, second_chance_attempts : Int, max_queue_length : Int) -> Unit

fn record_regalloc_phase_us(phase_name : String, duration_us : Int64) -> Unit

fn record_regalloc_stats(spill_slots : Int, spills : Int, reloads : Int, reg_moves : Int, spill_to_spill : Int) -> Unit

fn record_stage_us(stage : FunctionCompileStage, duration_us : Int64) -> Unit

fn reset_module(expected_functions : Int) -> Unit

fn set_module_compile_us(us : Int64) -> Unit

fn tick_now() -> Instant