Module: MilkTea::Lowering::Events

Included in:
MilkTea::Lowerer
Defined in:
lib/milk_tea/core/lowering/events.rb

Instance Method Summary collapse

Instance Method Details

#active_event_slot_continue_guard(slot_pointer_expr) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 866

def active_event_slot_continue_guard(slot_pointer_expr)
  IR::IfStmt.new(
    condition: event_slot_active_expression(slot_pointer_expr),
    then_body: [IR::ContinueStmt.new],
    else_body: nil,
  )
end

#array_of(type, length) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 94

def array_of(type, length)
  Types::Registry.generic_instance("array", [type, Types::LiteralTypeArg.new(length)])
end

#build_event_emit_function(runtime) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 448

def build_event_emit_function(runtime)
  event_expr = IR::Name.new(name: "event", type: runtime.fetch(:event_pointer_type), pointer: false)
  payload_expr = runtime.fetch(:event_type).payload_type ? IR::Name.new(name: "payload", type: runtime.fetch(:event_type).payload_type, pointer: false) : nil
  snapshots_expr = IR::Name.new(name: "__mt_snapshots", type: runtime.fetch(:snapshots_type), pointer: false)
  snapshot_count_expr = IR::Name.new(name: "__mt_snapshot_count", type: @ctx.types.fetch("ptr_uint"), pointer: false)
  slot_index_expr = IR::Name.new(name: "__mt_slot_index", type: @ctx.types.fetch("ptr_uint"), pointer: false)
  dispatch_index_expr = IR::Name.new(name: "__mt_dispatch_index", type: @ctx.types.fetch("ptr_uint"), pointer: false)
  slot_pointer_expr = IR::Name.new(name: "__mt_slot", type: runtime.fetch(:slot_pointer_type), pointer: false)
  frame_pointer_expr = IR::Name.new(name: "__mt_wait_frame", type: runtime.fetch(:wait_frame_pointer_type), pointer: false)

  collect_body = [
    event_slot_local_decl(event_expr, slot_index_expr, runtime),
    inactive_event_slot_continue_guard(slot_pointer_expr),
    IR::Assignment.new(target: snapshot_field_expression(snapshots_expr, snapshot_count_expr, runtime, "slot", @ctx.types.fetch("ptr_uint")), operator: "=", value: slot_index_expr),
    IR::Assignment.new(target: snapshot_field_expression(snapshots_expr, snapshot_count_expr, runtime, "generation", @ctx.types.fetch("ptr_uint")), operator: "=", value: event_slot_field_expression(slot_pointer_expr, "generation", @ctx.types.fetch("ptr_uint"))),
    IR::Assignment.new(target: snapshot_field_expression(snapshots_expr, snapshot_count_expr, runtime, "once", @ctx.types.fetch("bool")), operator: "=", value: event_slot_field_expression(slot_pointer_expr, "once", @ctx.types.fetch("bool"))),
    IR::Assignment.new(target: snapshot_field_expression(snapshots_expr, snapshot_count_expr, runtime, "wait_slot", @ctx.types.fetch("bool")),
      operator: "=",
      value: IR::Binary.new(
        operator: "!=",
        left: event_slot_wait_frame_expression(slot_pointer_expr, runtime),
        right: IR::NullLiteral.new(type: runtime.fetch(:void_ptr)),
        type: @ctx.types.fetch("bool"),
      ),
    ),
    IR::Assignment.new(target: snapshot_field_expression(snapshots_expr, snapshot_count_expr, runtime, "stateful", @ctx.types.fetch("bool")), operator: "=", value: IR::Binary.new(operator: "!=", left: event_slot_field_expression(slot_pointer_expr, "state", runtime.fetch(:void_ptr)), right: IR::NullLiteral.new(type: runtime.fetch(:void_ptr)), type: @ctx.types.fetch("bool"))),
    IR::Assignment.new(target: snapshot_field_expression(snapshots_expr, snapshot_count_expr, runtime, "state", runtime.fetch(:void_ptr)), operator: "=", value: event_slot_field_expression(slot_pointer_expr, "state", runtime.fetch(:void_ptr))),
    IR::Assignment.new(target: snapshot_field_expression(snapshots_expr, snapshot_count_expr, runtime, "listener", runtime.fetch(:void_ptr)), operator: "=", value: event_slot_field_expression(slot_pointer_expr, "listener", runtime.fetch(:void_ptr))),
    IR::Assignment.new(target: snapshot_count_expr, operator: "+=", value: IR::IntegerLiteral.new(value: 1, type: @ctx.types.fetch("ptr_uint"))),
  ]

  snapshot_subscription_expr = event_subscription_literal(
    snapshot_field_expression(snapshots_expr, dispatch_index_expr, runtime, "slot", @ctx.types.fetch("ptr_uint")),
    snapshot_field_expression(snapshots_expr, dispatch_index_expr, runtime, "generation", @ctx.types.fetch("ptr_uint")),
  )
  current_slot_active = event_slot_active_expression(slot_pointer_expr)
  current_slot_generation = event_slot_field_expression(slot_pointer_expr, "generation", @ctx.types.fetch("ptr_uint"))
  current_wait_frame = event_slot_wait_frame_expression(slot_pointer_expr, runtime)
  wait_slot_condition = IR::Binary.new(
    operator: "and",
    left: current_slot_active,
    right: IR::Binary.new(
      operator: "and",
      left: IR::Binary.new(
        operator: "==",
        left: current_slot_generation,
        right: snapshot_field_expression(snapshots_expr, dispatch_index_expr, runtime, "generation", @ctx.types.fetch("ptr_uint")),
        type: @ctx.types.fetch("bool"),
      ),
      right: IR::Binary.new(
        operator: "!=",
        left: current_wait_frame,
        right: IR::NullLiteral.new(type: runtime.fetch(:void_ptr)),
        type: @ctx.types.fetch("bool"),
      ),
      type: @ctx.types.fetch("bool"),
    ),
    type: @ctx.types.fetch("bool"),
  )

  wait_result_value = event_wait_success_literal(runtime.fetch(:wait_result_type), payload_expr)
  waiter_frame_expr = wait_frame_field_expression(frame_pointer_expr, "waiter_frame", runtime.fetch(:void_ptr))

  dispatch_body = [
    IR::IfStmt.new(
      condition: snapshot_field_expression(snapshots_expr, dispatch_index_expr, runtime, "wait_slot", @ctx.types.fetch("bool")),
      then_body: [
        IR::LocalDecl.new(
          name: "__mt_slot",
          linkage_name: "__mt_slot",
          type: runtime.fetch(:slot_pointer_type),
          value: event_slot_pointer_expression(
            event_expr,
            snapshot_field_expression(snapshots_expr, dispatch_index_expr, runtime, "slot", @ctx.types.fetch("ptr_uint")),
            runtime,
          ),
        ),
        IR::IfStmt.new(
          condition: wait_slot_condition,
          then_body: [
            IR::LocalDecl.new(
              name: "__mt_wait_frame",
              linkage_name: "__mt_wait_frame",
              type: runtime.fetch(:wait_frame_pointer_type),
              value: IR::Cast.new(target_type: runtime.fetch(:wait_frame_pointer_type), expression: current_wait_frame, type: runtime.fetch(:wait_frame_pointer_type)),
            ),
            IR::ExpressionStmt.new(expression: event_unsubscribe_call(runtime, event_expr, snapshot_subscription_expr)),
            IR::Assignment.new(target: wait_frame_field_expression(frame_pointer_expr, "result", runtime.fetch(:wait_result_type)), operator: "=", value: wait_result_value),
            IR::Assignment.new(target: wait_frame_field_expression(frame_pointer_expr, "ready", @ctx.types.fetch("bool")), operator: "=", value: IR::BooleanLiteral.new(value: true, type: @ctx.types.fetch("bool"))),
            IR::IfStmt.new(
              condition: IR::Binary.new(
                operator: "!=",
                left: waiter_frame_expr,
                right: IR::NullLiteral.new(type: runtime.fetch(:void_ptr)),
                type: @ctx.types.fetch("bool"),
              ),
              then_body: [
                IR::LocalDecl.new(name: "__mt_waiter_frame", linkage_name: "__mt_waiter_frame", type: runtime.fetch(:void_ptr), value: waiter_frame_expr),
                IR::Assignment.new(target: waiter_frame_expr, operator: "=", value: IR::NullLiteral.new(type: runtime.fetch(:void_ptr))),
                IR::ExpressionStmt.new(
                  expression: IR::Call.new(
                    callee: wait_frame_field_expression(frame_pointer_expr, "waiter", runtime.fetch(:wake_type)),
                    arguments: [IR::Name.new(name: "__mt_waiter_frame", type: runtime.fetch(:void_ptr), pointer: false)],
                    type: @ctx.types.fetch("void"),
                  ),
                ),
              ],
              else_body: nil,
            ),
          ],
          else_body: nil,
        ),
      ],
      else_body: [
        IR::IfStmt.new(
          condition: snapshot_field_expression(snapshots_expr, dispatch_index_expr, runtime, "once", @ctx.types.fetch("bool")),
          then_body: [IR::ExpressionStmt.new(expression: event_unsubscribe_call(runtime, event_expr, snapshot_subscription_expr))],
          else_body: nil,
        ),
        IR::IfStmt.new(
          condition: snapshot_field_expression(snapshots_expr, dispatch_index_expr, runtime, "stateful", @ctx.types.fetch("bool")),
          then_body: [
            IR::ExpressionStmt.new(expression: event_stateful_listener_call_expression(runtime, snapshots_expr, dispatch_index_expr, payload_expr)),
          ],
          else_body: [
            IR::ExpressionStmt.new(expression: event_listener_call_expression(runtime, snapshots_expr, dispatch_index_expr, payload_expr)),
          ],
        ),
      ],
    ),
  ]

  body = [
    IR::LocalDecl.new(name: "__mt_snapshots", linkage_name: "__mt_snapshots", type: runtime.fetch(:snapshots_type), value: IR::ZeroInit.new(type: runtime.fetch(:snapshots_type))),
    IR::LocalDecl.new(name: "__mt_snapshot_count", linkage_name: "__mt_snapshot_count", type: @ctx.types.fetch("ptr_uint"), value: IR::IntegerLiteral.new(value: 0, type: @ctx.types.fetch("ptr_uint"))),
    IR::ForStmt.new(
      init: IR::LocalDecl.new(name: "__mt_slot_index", linkage_name: "__mt_slot_index", type: @ctx.types.fetch("ptr_uint"), value: IR::IntegerLiteral.new(value: 0, type: @ctx.types.fetch("ptr_uint"))),
      condition: IR::Binary.new(operator: "<", left: slot_index_expr, right: IR::IntegerLiteral.new(value: runtime.fetch(:event_type).capacity, type: @ctx.types.fetch("ptr_uint")), type: @ctx.types.fetch("bool")),
      post: IR::Assignment.new(target: slot_index_expr, operator: "+=", value: IR::IntegerLiteral.new(value: 1, type: @ctx.types.fetch("ptr_uint"))),
      body: collect_body,
    ),
    IR::ForStmt.new(
      init: IR::LocalDecl.new(name: "__mt_dispatch_index", linkage_name: "__mt_dispatch_index", type: @ctx.types.fetch("ptr_uint"), value: IR::IntegerLiteral.new(value: 0, type: @ctx.types.fetch("ptr_uint"))),
      condition: IR::Binary.new(operator: "<", left: dispatch_index_expr, right: snapshot_count_expr, type: @ctx.types.fetch("bool")),
      post: IR::Assignment.new(target: dispatch_index_expr, operator: "+=", value: IR::IntegerLiteral.new(value: 1, type: @ctx.types.fetch("ptr_uint"))),
      body: dispatch_body,
    ),
    IR::ReturnStmt.new(value: nil),
  ]

  params = [IR::Param.new(name: "event", linkage_name: "event", type: runtime.fetch(:event_pointer_type), pointer: false)]
  params << IR::Param.new(name: "payload", linkage_name: "payload", type: runtime.fetch(:event_type).payload_type, pointer: false) if runtime.fetch(:event_type).payload_type

  IR::Function.new(
    name: "#{runtime.fetch(:emit_linkage_name)}_fn",
    linkage_name: runtime.fetch(:emit_linkage_name),
    params:,
    return_type: @ctx.types.fetch("void"),
    body:,
    entry_point: false,
  )
end

#build_event_subscribe_function(runtime, once:) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 271

def build_event_subscribe_function(runtime, once:)
  event_expr = IR::Name.new(name: "event", type: runtime.fetch(:event_pointer_type), pointer: false)
  listener_expr = IR::Name.new(name: "listener", type: runtime.fetch(:listener_type), pointer: false)
  slot_index_expr = IR::Name.new(name: "__mt_slot_index", type: @ctx.types.fetch("ptr_uint"), pointer: false)
  generation_expr = IR::Name.new(name: "__mt_generation", type: @ctx.types.fetch("ptr_uint"), pointer: false)
  slot_pointer_expr = IR::Name.new(name: "__mt_slot", type: runtime.fetch(:slot_pointer_type), pointer: false)

  body = [
    IR::ForStmt.new(
      init: IR::LocalDecl.new(
        name: "__mt_slot_index",
        linkage_name: "__mt_slot_index",
        type: @ctx.types.fetch("ptr_uint"),
        value: IR::IntegerLiteral.new(value: 0, type: @ctx.types.fetch("ptr_uint")),
      ),
      condition: IR::Binary.new(
        operator: "<",
        left: slot_index_expr,
        right: IR::IntegerLiteral.new(value: runtime.fetch(:event_type).capacity, type: @ctx.types.fetch("ptr_uint")),
        type: @ctx.types.fetch("bool"),
      ),
      post: IR::Assignment.new(target: slot_index_expr, operator: "+=", value: IR::IntegerLiteral.new(value: 1, type: @ctx.types.fetch("ptr_uint"))),
      body: [
        event_slot_local_decl(event_expr, slot_index_expr, runtime),
        active_event_slot_continue_guard(slot_pointer_expr),
        IR::LocalDecl.new(
          name: "__mt_generation",
          linkage_name: "__mt_generation",
          type: @ctx.types.fetch("ptr_uint"),
          value: event_next_generation_expression(slot_pointer_expr),
        ),
        *event_slot_activate_statements(
          slot_pointer_expr,
          runtime,
          generation_expr: generation_expr,
          once: once,
          wait_frame_expr: IR::NullLiteral.new(type: runtime.fetch(:void_ptr)),
          listener_expr: IR::Cast.new(target_type: runtime.fetch(:void_ptr), expression: listener_expr, type: runtime.fetch(:void_ptr)),
        ),
        IR::ReturnStmt.new(value: event_subscription_success_literal(runtime.fetch(:subscription_result_type), slot_index_expr, generation_expr)),
      ],
    ),
    IR::ReturnStmt.new(value: event_failure_literal(runtime.fetch(:subscription_result_type))),
  ]

  IR::Function.new(
    name: once ? "#{runtime.fetch(:subscribe_once_linkage_name)}_fn" : "#{runtime.fetch(:subscribe_linkage_name)}_fn",
    linkage_name: once ? runtime.fetch(:subscribe_once_linkage_name) : runtime.fetch(:subscribe_linkage_name),
    params: [
      IR::Param.new(name: "event", linkage_name: "event", type: runtime.fetch(:event_pointer_type), pointer: false),
      IR::Param.new(name: "listener", linkage_name: "listener", type: runtime.fetch(:listener_type), pointer: false),
    ],
    return_type: runtime.fetch(:subscription_result_type),
    body:,
    entry_point: false,
  )
end

#build_event_subscribe_stateful_function(runtime, once:) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 329

def build_event_subscribe_stateful_function(runtime, once:)
  event_expr = IR::Name.new(name: "event", type: runtime.fetch(:event_pointer_type), pointer: false)
  state_expr = IR::Name.new(name: "state", type: runtime.fetch(:void_ptr), pointer: false)
  listener_expr = IR::Name.new(name: "listener", type: runtime.fetch(:void_ptr), pointer: false)
  slot_index_expr = IR::Name.new(name: "__mt_slot_index", type: @ctx.types.fetch("ptr_uint"), pointer: false)
  generation_expr = IR::Name.new(name: "__mt_generation", type: @ctx.types.fetch("ptr_uint"), pointer: false)
  slot_pointer_expr = IR::Name.new(name: "__mt_slot", type: runtime.fetch(:slot_pointer_type), pointer: false)

  body = [
    IR::ForStmt.new(
      init: IR::LocalDecl.new(
        name: "__mt_slot_index",
        linkage_name: "__mt_slot_index",
        type: @ctx.types.fetch("ptr_uint"),
        value: IR::IntegerLiteral.new(value: 0, type: @ctx.types.fetch("ptr_uint")),
      ),
      condition: IR::Binary.new(
        operator: "<",
        left: slot_index_expr,
        right: IR::IntegerLiteral.new(value: runtime.fetch(:event_type).capacity, type: @ctx.types.fetch("ptr_uint")),
        type: @ctx.types.fetch("bool"),
      ),
      post: IR::Assignment.new(target: slot_index_expr, operator: "+=", value: IR::IntegerLiteral.new(value: 1, type: @ctx.types.fetch("ptr_uint"))),
      body: [
        event_slot_local_decl(event_expr, slot_index_expr, runtime),
        active_event_slot_continue_guard(slot_pointer_expr),
        IR::LocalDecl.new(
          name: "__mt_generation",
          linkage_name: "__mt_generation",
          type: @ctx.types.fetch("ptr_uint"),
          value: event_next_generation_expression(slot_pointer_expr),
        ),
        *event_slot_activate_stateful_statements(
          slot_pointer_expr,
          runtime,
          generation_expr: generation_expr,
          once: once,
          state_expr: state_expr,
          wait_frame_expr: IR::NullLiteral.new(type: runtime.fetch(:void_ptr)),
          listener_expr: listener_expr,
        ),
        IR::ReturnStmt.new(value: event_subscription_success_literal(runtime.fetch(:subscription_result_type), slot_index_expr, generation_expr)),
      ],
    ),
    IR::ReturnStmt.new(value: event_failure_literal(runtime.fetch(:subscription_result_type))),
  ]

  linkage_name = once ? runtime.fetch(:subscribe_once_stateful_linkage_name) : runtime.fetch(:subscribe_stateful_linkage_name)
  IR::Function.new(
    name: "#{linkage_name}_fn",
    linkage_name:,
    params: [
      IR::Param.new(name: "event", linkage_name: "event", type: runtime.fetch(:event_pointer_type), pointer: false),
      IR::Param.new(name: "state", linkage_name: "state", type: runtime.fetch(:void_ptr), pointer: false),
      IR::Param.new(name: "listener", linkage_name: "listener", type: runtime.fetch(:void_ptr), pointer: false),
    ],
    return_type: runtime.fetch(:subscription_result_type),
    body:,
    entry_point: false,
  )
end

#build_event_unsubscribe_function(runtime) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 391

def build_event_unsubscribe_function(runtime)
  event_expr = IR::Name.new(name: "event", type: runtime.fetch(:event_pointer_type), pointer: false)
  subscription_expr = IR::Name.new(name: "subscription", type: @ctx.types.fetch("Subscription"), pointer: false)
  slot_index_expr = subscription_field_expression(subscription_expr, "slot", @ctx.types.fetch("ptr_uint"))
  slot_pointer_expr = IR::Name.new(name: "__mt_slot", type: runtime.fetch(:slot_pointer_type), pointer: false)

  false_value = IR::BooleanLiteral.new(value: false, type: @ctx.types.fetch("bool"))
  true_value = IR::BooleanLiteral.new(value: true, type: @ctx.types.fetch("bool"))
  body = [
    IR::IfStmt.new(
      condition: IR::Binary.new(
        operator: ">=",
        left: slot_index_expr,
        right: IR::IntegerLiteral.new(value: runtime.fetch(:event_type).capacity, type: @ctx.types.fetch("ptr_uint")),
        type: @ctx.types.fetch("bool"),
      ),
      then_body: [IR::ReturnStmt.new(value: false_value)],
      else_body: nil,
    ),
    IR::LocalDecl.new(
      name: "__mt_slot",
      linkage_name: "__mt_slot",
      type: runtime.fetch(:slot_pointer_type),
      value: event_slot_pointer_expression(event_expr, slot_index_expr, runtime),
    ),
    IR::IfStmt.new(
      condition: IR::Unary.new(operator: "not", operand: event_slot_active_expression(slot_pointer_expr), type: @ctx.types.fetch("bool")),
      then_body: [IR::ReturnStmt.new(value: false_value)],
      else_body: nil,
    ),
    IR::IfStmt.new(
      condition: IR::Binary.new(
        operator: "!=",
        left: event_slot_field_expression(slot_pointer_expr, "generation", @ctx.types.fetch("ptr_uint")),
        right: subscription_field_expression(subscription_expr, "generation", @ctx.types.fetch("ptr_uint")),
        type: @ctx.types.fetch("bool"),
      ),
      then_body: [IR::ReturnStmt.new(value: false_value)],
      else_body: nil,
    ),
    *event_slot_clear_statements(slot_pointer_expr, runtime),
    IR::ReturnStmt.new(value: true_value),
  ]

  IR::Function.new(
    name: "#{runtime.fetch(:unsubscribe_linkage_name)}_fn",
    linkage_name: runtime.fetch(:unsubscribe_linkage_name),
    params: [
      IR::Param.new(name: "event", linkage_name: "event", type: runtime.fetch(:event_pointer_type), pointer: false),
      IR::Param.new(name: "subscription", linkage_name: "subscription", type: @ctx.types.fetch("Subscription"), pointer: false),
    ],
    return_type: @ctx.types.fetch("bool"),
    body:,
    entry_point: false,
  )
end

#build_event_wait_function(runtime) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 776

def build_event_wait_function(runtime)
  event_expr = IR::Name.new(name: "event", type: runtime.fetch(:event_pointer_type), pointer: false)
  frame_expr = IR::Name.new(name: "__mt_wait_frame", type: runtime.fetch(:wait_frame_pointer_type), pointer: false)
  raw_frame_expr = IR::Cast.new(target_type: runtime.fetch(:void_ptr), expression: frame_expr, type: runtime.fetch(:void_ptr))
  slot_index_expr = IR::Name.new(name: "__mt_slot_index", type: @ctx.types.fetch("ptr_uint"), pointer: false)
  generation_expr = IR::Name.new(name: "__mt_generation", type: @ctx.types.fetch("ptr_uint"), pointer: false)
  slot_pointer_expr = IR::Name.new(name: "__mt_slot", type: runtime.fetch(:slot_pointer_type), pointer: false)

  body = [
    IR::ForStmt.new(
      init: IR::LocalDecl.new(name: "__mt_slot_index", linkage_name: "__mt_slot_index", type: @ctx.types.fetch("ptr_uint"), value: IR::IntegerLiteral.new(value: 0, type: @ctx.types.fetch("ptr_uint"))),
      condition: IR::Binary.new(operator: "<", left: slot_index_expr, right: IR::IntegerLiteral.new(value: runtime.fetch(:event_type).capacity, type: @ctx.types.fetch("ptr_uint")), type: @ctx.types.fetch("bool")),
      post: IR::Assignment.new(target: slot_index_expr, operator: "+=", value: IR::IntegerLiteral.new(value: 1, type: @ctx.types.fetch("ptr_uint"))),
      body: [
        IR::LocalDecl.new(name: "__mt_slot", linkage_name: "__mt_slot", type: runtime.fetch(:slot_pointer_type), value: event_slot_pointer_expression(event_expr, slot_index_expr, runtime)),
        active_event_slot_continue_guard(slot_pointer_expr),
        IR::LocalDecl.new(
          name: "__mt_generation",
          linkage_name: "__mt_generation",
          type: @ctx.types.fetch("ptr_uint"),
          value: event_next_generation_expression(slot_pointer_expr),
        ),
        IR::LocalDecl.new(
          name: "__mt_wait_frame",
          linkage_name: "__mt_wait_frame",
          type: runtime.fetch(:wait_frame_pointer_type),
          value: IR::Cast.new(
            target_type: runtime.fetch(:wait_frame_pointer_type),
            expression: IR::Call.new(callee: "mt_async_alloc", arguments: [IR::SizeofExpr.new(target_type: runtime.fetch(:wait_frame_type), type: @ctx.types.fetch("ptr_uint"))], type: runtime.fetch(:void_ptr)),
            type: runtime.fetch(:wait_frame_pointer_type),
          ),
        ),
        IR::Assignment.new(
          target: IR::Unary.new(operator: "*", operand: frame_expr, type: runtime.fetch(:wait_frame_type)),
          operator: "=",
          value: IR::ZeroInit.new(type: runtime.fetch(:wait_frame_type)),
        ),
        IR::Assignment.new(target: wait_frame_field_expression(frame_expr, "event", runtime.fetch(:void_ptr)), operator: "=", value: IR::Cast.new(target_type: runtime.fetch(:void_ptr), expression: event_expr, type: runtime.fetch(:void_ptr))),
        *event_slot_activate_statements(
          slot_pointer_expr,
          runtime,
          generation_expr: generation_expr,
          once: true,
          wait_frame_expr: raw_frame_expr,
        ),
        IR::Assignment.new(target: wait_frame_field_expression(frame_expr, "subscription", @ctx.types.fetch("Subscription")), operator: "=", value: event_subscription_literal(slot_index_expr, generation_expr)),
        IR::ReturnStmt.new(value: event_task_literal(runtime, frame_expr)),
      ],
    ),
    IR::ReturnStmt.new(value: event_immediate_failure_task_literal(runtime)),
  ]

  IR::Function.new(
    name: "#{runtime.fetch(:wait_linkage_name)}_fn",
    linkage_name: runtime.fetch(:wait_linkage_name),
    params: [IR::Param.new(name: "event", linkage_name: "event", type: runtime.fetch(:event_pointer_type), pointer: false)],
    return_type: runtime.fetch(:task_type),
    body:,
    entry_point: false,
  )
end

#build_event_wait_ready_function(runtime) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 611

def build_event_wait_ready_function(runtime)
  frame_expr = IR::Name.new(name: "__mt_wait_frame", type: runtime.fetch(:wait_frame_pointer_type), pointer: false)
  raw_frame_expr = IR::Name.new(name: "frame", type: runtime.fetch(:void_ptr), pointer: false)

  IR::Function.new(
    name: "#{runtime.fetch(:wait_ready_linkage_name)}_fn",
    linkage_name: runtime.fetch(:wait_ready_linkage_name),
    params: [IR::Param.new(name: "frame", linkage_name: "frame", type: runtime.fetch(:void_ptr), pointer: false)],
    return_type: @ctx.types.fetch("bool"),
    body: [
      IR::IfStmt.new(
        condition: IR::Binary.new(
          operator: "==",
          left: raw_frame_expr,
          right: IR::NullLiteral.new(type: runtime.fetch(:void_ptr)),
          type: @ctx.types.fetch("bool"),
        ),
        then_body: [IR::ReturnStmt.new(value: IR::BooleanLiteral.new(value: true, type: @ctx.types.fetch("bool")))],
        else_body: nil,
      ),
      IR::LocalDecl.new(
        name: "__mt_wait_frame",
        linkage_name: "__mt_wait_frame",
        type: runtime.fetch(:wait_frame_pointer_type),
        value: IR::Cast.new(
          target_type: runtime.fetch(:wait_frame_pointer_type),
          expression: IR::Name.new(name: "frame", type: runtime.fetch(:void_ptr), pointer: false),
          type: runtime.fetch(:wait_frame_pointer_type),
        ),
      ),
      IR::ReturnStmt.new(value: wait_frame_field_expression(frame_expr, "ready", @ctx.types.fetch("bool"))),
    ],
    entry_point: false,
  )
end

#build_event_wait_release_function(runtime) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 698

def build_event_wait_release_function(runtime)
  frame_expr = IR::Name.new(name: "__mt_wait_frame", type: runtime.fetch(:wait_frame_pointer_type), pointer: false)
  raw_frame_expr = IR::Name.new(name: "frame", type: runtime.fetch(:void_ptr), pointer: false)

  IR::Function.new(
    name: "#{runtime.fetch(:wait_release_linkage_name)}_fn",
    linkage_name: runtime.fetch(:wait_release_linkage_name),
    params: [IR::Param.new(name: "frame", linkage_name: "frame", type: runtime.fetch(:void_ptr), pointer: false)],
    return_type: @ctx.types.fetch("void"),
    body: [
      IR::IfStmt.new(
        condition: IR::Binary.new(
          operator: "==",
          left: raw_frame_expr,
          right: IR::NullLiteral.new(type: runtime.fetch(:void_ptr)),
          type: @ctx.types.fetch("bool"),
        ),
        then_body: [IR::ReturnStmt.new(value: nil)],
        else_body: nil,
      ),
      IR::LocalDecl.new(
        name: "__mt_wait_frame",
        linkage_name: "__mt_wait_frame",
        type: runtime.fetch(:wait_frame_pointer_type),
        value: IR::Cast.new(target_type: runtime.fetch(:wait_frame_pointer_type), expression: raw_frame_expr, type: runtime.fetch(:wait_frame_pointer_type)),
      ),
      IR::IfStmt.new(
        condition: IR::Unary.new(operator: "not", operand: wait_frame_field_expression(frame_expr, "ready", @ctx.types.fetch("bool")), type: @ctx.types.fetch("bool")),
        then_body: [
          IR::ExpressionStmt.new(
            expression: event_unsubscribe_call(
              runtime,
              IR::Cast.new(target_type: runtime.fetch(:event_pointer_type), expression: wait_frame_field_expression(frame_expr, "event", runtime.fetch(:void_ptr)), type: runtime.fetch(:event_pointer_type)),
              wait_frame_field_expression(frame_expr, "subscription", @ctx.types.fetch("Subscription")),
            ),
          ),
        ],
        else_body: nil,
      ),
      IR::ExpressionStmt.new(expression: IR::Call.new(callee: "mt_async_free", arguments: [raw_frame_expr], type: @ctx.types.fetch("void"))),
      IR::ReturnStmt.new(value: nil),
    ],
    entry_point: false,
  )
end

#build_event_wait_set_waiter_function(runtime) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 647

def build_event_wait_set_waiter_function(runtime)
  frame_expr = IR::Name.new(name: "__mt_wait_frame", type: runtime.fetch(:wait_frame_pointer_type), pointer: false)
  raw_frame_expr = IR::Name.new(name: "frame", type: runtime.fetch(:void_ptr), pointer: false)
  waiter_frame_expr = IR::Name.new(name: "waiter_frame", type: runtime.fetch(:void_ptr), pointer: false)
  waiter_expr = IR::Name.new(name: "waiter", type: runtime.fetch(:wake_type), pointer: false)

  IR::Function.new(
    name: "#{runtime.fetch(:wait_set_waiter_linkage_name)}_fn",
    linkage_name: runtime.fetch(:wait_set_waiter_linkage_name),
    params: [
      IR::Param.new(name: "frame", linkage_name: "frame", type: runtime.fetch(:void_ptr), pointer: false),
      IR::Param.new(name: "waiter_frame", linkage_name: "waiter_frame", type: runtime.fetch(:void_ptr), pointer: false),
      IR::Param.new(name: "waiter", linkage_name: "waiter", type: runtime.fetch(:wake_type), pointer: false),
    ],
    return_type: @ctx.types.fetch("void"),
    body: [
      IR::IfStmt.new(
        condition: IR::Binary.new(
          operator: "==",
          left: raw_frame_expr,
          right: IR::NullLiteral.new(type: runtime.fetch(:void_ptr)),
          type: @ctx.types.fetch("bool"),
        ),
        then_body: [
          IR::ExpressionStmt.new(expression: IR::Call.new(callee: waiter_expr, arguments: [waiter_frame_expr], type: @ctx.types.fetch("void"))),
          IR::ReturnStmt.new(value: nil),
        ],
        else_body: nil,
      ),
      IR::LocalDecl.new(
        name: "__mt_wait_frame",
        linkage_name: "__mt_wait_frame",
        type: runtime.fetch(:wait_frame_pointer_type),
        value: IR::Cast.new(target_type: runtime.fetch(:wait_frame_pointer_type), expression: IR::Name.new(name: "frame", type: runtime.fetch(:void_ptr), pointer: false), type: runtime.fetch(:wait_frame_pointer_type)),
      ),
      IR::IfStmt.new(
        condition: wait_frame_field_expression(frame_expr, "ready", @ctx.types.fetch("bool")),
        then_body: [
          IR::ExpressionStmt.new(expression: IR::Call.new(callee: waiter_expr, arguments: [waiter_frame_expr], type: @ctx.types.fetch("void"))),
          IR::ReturnStmt.new(value: nil),
        ],
        else_body: nil,
      ),
      IR::Assignment.new(target: wait_frame_field_expression(frame_expr, "waiter_frame", runtime.fetch(:void_ptr)), operator: "=", value: waiter_frame_expr),
      IR::Assignment.new(target: wait_frame_field_expression(frame_expr, "waiter", runtime.fetch(:wake_type)), operator: "=", value: waiter_expr),
      IR::ReturnStmt.new(value: nil),
    ],
    entry_point: false,
  )
end

#build_event_wait_take_result_function(runtime) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 744

def build_event_wait_take_result_function(runtime)
  frame_expr = IR::Name.new(name: "__mt_wait_frame", type: runtime.fetch(:wait_frame_pointer_type), pointer: false)
  raw_frame_expr = IR::Name.new(name: "frame", type: runtime.fetch(:void_ptr), pointer: false)

  IR::Function.new(
    name: "#{runtime.fetch(:wait_take_result_linkage_name)}_fn",
    linkage_name: runtime.fetch(:wait_take_result_linkage_name),
    params: [IR::Param.new(name: "frame", linkage_name: "frame", type: runtime.fetch(:void_ptr), pointer: false)],
    return_type: runtime.fetch(:wait_result_type),
    body: [
      IR::IfStmt.new(
        condition: IR::Binary.new(
          operator: "==",
          left: raw_frame_expr,
          right: IR::NullLiteral.new(type: runtime.fetch(:void_ptr)),
          type: @ctx.types.fetch("bool"),
        ),
        then_body: [IR::ReturnStmt.new(value: event_failure_literal(runtime.fetch(:wait_result_type)))],
        else_body: nil,
      ),
      IR::LocalDecl.new(
        name: "__mt_wait_frame",
        linkage_name: "__mt_wait_frame",
        type: runtime.fetch(:wait_frame_pointer_type),
        value: IR::Cast.new(target_type: runtime.fetch(:wait_frame_pointer_type), expression: IR::Name.new(name: "frame", type: runtime.fetch(:void_ptr), pointer: false), type: runtime.fetch(:wait_frame_pointer_type)),
      ),
      IR::ReturnStmt.new(value: wait_frame_field_expression(frame_expr, "result", runtime.fetch(:wait_result_type))),
    ],
    entry_point: false,
  )
end

#ensure_event_error_enum ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 115

def ensure_event_error_enum
  return if @artifacts.event_error_enum_emitted

  event_error_type = @ctx.types.fetch("EventError")
  @artifacts.synthetic_enums << IR::EnumDecl.new(
    name: event_error_type.name,
    linkage_name: c_type_name(event_error_type),
    backing_type: event_error_type.backing_type,
    members: [
      IR::EnumMember.new(
        name: "full",
        linkage_name: enum_member_c_name(event_error_type, "full"),
        value: IR::IntegerLiteral.new(value: 0, type: event_error_type.backing_type),
      ),
    ],
    flags: false,
  )
  @artifacts.event_error_enum_emitted = true
end

#ensure_event_runtime(event_type) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 135

def ensure_event_runtime(event_type)
  return @artifacts.event_runtime_infos.fetch(event_type) if @artifacts.event_runtime_infos.key?(event_type)

  ensure_subscription_runtime
  ensure_event_error_enum

  void_ptr = pointer_to(@ctx.types.fetch("void"))
  listener_type = event_listener_function_type(event_type)
  subscription_result_type = event_subscription_result_type
  wait_result_type = event_wait_result_type(event_type)
  task_type = Types::Registry.task(wait_result_type)
  wake_type = task_type.field("ready").params.fetch(0).type == void_ptr ? task_type.field("set_waiter").params.fetch(2).type : Types::Registry.function(nil, params: [Types::Registry.parameter("frame", void_ptr)], return_type: @ctx.types.fetch("void"))
  slot_type = Types::Struct.new("#{event_type.linkage_name}__slot").define_fields(
    "active" => @ctx.types.fetch("bool"),
    "once" => @ctx.types.fetch("bool"),
    "generation" => @ctx.types.fetch("ptr_uint"),
    "state" => void_ptr,
    "listener" => void_ptr,
    "wait_frame" => void_ptr,
  )
  snapshot_type = Types::Struct.new("#{event_type.linkage_name}__snapshot").define_fields(
    "slot" => @ctx.types.fetch("ptr_uint"),
    "generation" => @ctx.types.fetch("ptr_uint"),
    "once" => @ctx.types.fetch("bool"),
    "wait_slot" => @ctx.types.fetch("bool"),
    "stateful" => @ctx.types.fetch("bool"),
    "state" => void_ptr,
    "listener" => void_ptr,
  )
  wait_frame_type = Types::Struct.new("#{event_type.linkage_name}__wait_frame").define_fields(
    "ready" => @ctx.types.fetch("bool"),
    "waiter_frame" => void_ptr,
    "waiter" => wake_type,
    "event" => void_ptr,
    "subscription" => @ctx.types.fetch("Subscription"),
    "result" => wait_result_type,
  )
  slots_type = array_of(slot_type, event_type.capacity)
  snapshots_type = array_of(snapshot_type, event_type.capacity)

  @artifacts.synthetic_structs << IR::StructDecl.new(
    name: slot_type.name,
    linkage_name: slot_type.name,
    fields: [
      IR::Field.new(name: "active", type: @ctx.types.fetch("bool")),
      IR::Field.new(name: "once", type: @ctx.types.fetch("bool")),
      IR::Field.new(name: "generation", type: @ctx.types.fetch("ptr_uint")),
      IR::Field.new(name: "state", type: void_ptr),
      IR::Field.new(name: "listener", type: void_ptr),
      IR::Field.new(name: "wait_frame", type: void_ptr),
    ],
    packed: false,
    alignment: nil,
  )
  @artifacts.synthetic_structs << IR::StructDecl.new(
    name: snapshot_type.name,
    linkage_name: snapshot_type.name,
    fields: [
      IR::Field.new(name: "slot", type: @ctx.types.fetch("ptr_uint")),
      IR::Field.new(name: "generation", type: @ctx.types.fetch("ptr_uint")),
      IR::Field.new(name: "once", type: @ctx.types.fetch("bool")),
      IR::Field.new(name: "wait_slot", type: @ctx.types.fetch("bool")),
      IR::Field.new(name: "stateful", type: @ctx.types.fetch("bool")),
      IR::Field.new(name: "state", type: void_ptr),
      IR::Field.new(name: "listener", type: void_ptr),
    ],
    packed: false,
    alignment: nil,
  )
  @artifacts.synthetic_structs << IR::StructDecl.new(
    name: wait_frame_type.name,
    linkage_name: wait_frame_type.name,
    fields: [
      IR::Field.new(name: "ready", type: @ctx.types.fetch("bool")),
      IR::Field.new(name: "waiter_frame", type: void_ptr),
      IR::Field.new(name: "waiter", type: wake_type),
      IR::Field.new(name: "event", type: void_ptr),
      IR::Field.new(name: "subscription", type: @ctx.types.fetch("Subscription")),
      IR::Field.new(name: "result", type: wait_result_type),
    ],
    packed: false,
    alignment: nil,
  )
  @artifacts.synthetic_structs << IR::StructDecl.new(
    name: event_type.name,
    linkage_name: event_type.linkage_name,
    fields: [IR::Field.new(name: "slots", type: slots_type)],
    packed: false,
    alignment: nil,
  )

  runtime = {
    event_type:,
    event_pointer_type: pointer_to(event_type),
    listener_type:,
    stateful_listener_type: event_stateful_listener_function_type(event_type),
    slot_type:,
    slot_pointer_type: pointer_to(slot_type),
    slots_type:,
    snapshot_type:,
    snapshots_type:,
    wait_frame_type:,
    wait_frame_pointer_type: pointer_to(wait_frame_type),
    void_ptr:,
    wake_type:,
    subscription_result_type:,
    wait_result_type:,
    task_type:,
    subscribe_linkage_name: "#{event_type.linkage_name}__subscribe",
    subscribe_once_linkage_name: "#{event_type.linkage_name}__subscribe_once",
    subscribe_stateful_linkage_name: "#{event_type.linkage_name}__subscribe_stateful",
    subscribe_once_stateful_linkage_name: "#{event_type.linkage_name}__subscribe_once_stateful",
    unsubscribe_linkage_name: "#{event_type.linkage_name}__unsubscribe",
    emit_linkage_name: "#{event_type.linkage_name}__emit",
    wait_linkage_name: "#{event_type.linkage_name}__wait",
    wait_ready_linkage_name: "#{event_type.linkage_name}__wait__ready",
    wait_set_waiter_linkage_name: "#{event_type.linkage_name}__wait__set_waiter",
    wait_release_linkage_name: "#{event_type.linkage_name}__wait__release",
    wait_take_result_linkage_name: "#{event_type.linkage_name}__wait__take_result",
  }

  @artifacts.synthetic_functions << build_event_subscribe_function(runtime, once: false)
  @artifacts.synthetic_functions << build_event_subscribe_function(runtime, once: true)
  @artifacts.synthetic_functions << build_event_subscribe_stateful_function(runtime, once: false)
  @artifacts.synthetic_functions << build_event_subscribe_stateful_function(runtime, once: true)
  @artifacts.synthetic_functions << build_event_unsubscribe_function(runtime)
  @artifacts.synthetic_functions << build_event_emit_function(runtime)
  @artifacts.synthetic_functions << build_event_wait_ready_function(runtime)
  @artifacts.synthetic_functions << build_event_wait_set_waiter_function(runtime)
  @artifacts.synthetic_functions << build_event_wait_release_function(runtime)
  @artifacts.synthetic_functions << build_event_wait_take_result_function(runtime)
  @artifacts.synthetic_functions << build_event_wait_function(runtime)

  @artifacts.event_runtime_infos[event_type] = runtime
end

#ensure_subscription_runtime ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 98

def ensure_subscription_runtime
  return if @artifacts.subscription_runtime_emitted

  subscription_type = @ctx.types.fetch("Subscription")
  @artifacts.synthetic_structs << IR::StructDecl.new(
    name: subscription_type.name,
    linkage_name: subscription_type.linkage_name,
    fields: [
      IR::Field.new(name: "slot", type: @ctx.types.fetch("ptr_uint")),
      IR::Field.new(name: "generation", type: @ctx.types.fetch("ptr_uint")),
    ],
    packed: false,
    alignment: nil,
  )
  @artifacts.subscription_runtime_emitted = true
end

#event_failure_literal(result_type) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 969

def event_failure_literal(result_type)
  IR::VariantLiteral.new(
    type: result_type,
    arm_name: "failure",
    fields: [
      IR::AggregateField.new(
        name: "error",
        value: IR::Name.new(name: enum_member_c_name(@ctx.types.fetch("EventError"), "full"), type: @ctx.types.fetch("EventError"), pointer: false),
      ),
    ],
  )
end

#event_immediate_failure_task_literal(runtime) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 1036

def event_immediate_failure_task_literal(runtime)
  event_task_literal_from_raw_frame(runtime, IR::NullLiteral.new(type: runtime.fetch(:void_ptr)))
end

#event_listener_call_expression(runtime, snapshots_expr, dispatch_index_expr, payload_expr) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 998

def event_listener_call_expression(runtime, snapshots_expr, dispatch_index_expr, payload_expr)
  listener_type = runtime.fetch(:listener_type)
  listener_expr = IR::Cast.new(
    target_type: listener_type,
    expression: snapshot_field_expression(snapshots_expr, dispatch_index_expr, runtime, "listener", runtime.fetch(:void_ptr)),
    type: listener_type,
  )
  arguments = []
  arguments << payload_expr if runtime.fetch(:event_type).payload_type
  IR::Call.new(
    callee: listener_expr,
    arguments:,
    type: @ctx.types.fetch("void"),
  )
end

#event_listener_function_type(event_type) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 82

def event_listener_function_type(event_type)
  params = []
  params << Types::Registry.parameter("payload", event_type.payload_type) if event_type.payload_type
  Types::Registry.function("#{event_type.name}__listener", params:, return_type: @ctx.types.fetch("void"))
end

#event_member_from_owner_type(receiver_type, member_name) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 52

def event_member_from_owner_type(receiver_type, member_name)
  owner_type = receiver_type
  loop do
    case owner_type
    when Types::Nullable
      owner_type = owner_type.base
    when Types::GenericInstance
      if %w[ptr const_ptr own ref].include?(owner_type.name) && owner_type.arguments.length == 1
        owner_type = owner_type.arguments.first
      else
        break
      end
    else
      break
    end
  end

  return unless owner_type.respond_to?(:event)

  owner_type.event(member_name)
end

#event_method_kind(receiver_type, member_name) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 6

def event_method_kind(receiver_type, member_name)
  return unless receiver_type.is_a?(Types::Event)

  case member_name
  when "subscribe" then :event_subscribe
  when "subscribe_once" then :event_subscribe_once
  when "unsubscribe" then :event_unsubscribe
  when "emit" then :event_emit
  when "wait" then :event_wait
  end
end

#event_method_type(kind, event_type) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 18

def event_method_type(kind, event_type)
  case kind
  when :event_subscribe, :event_subscribe_once
    Types::Registry.function(
      kind.to_s,
      params: [Types::Registry.parameter("listener", event_listener_function_type(event_type))],
      return_type: event_subscription_result_type,
    )
  when :event_subscribe_stateful, :event_subscribe_once_stateful
    Types::Registry.function(
      kind.to_s,
      params: [
        Types::Registry.parameter("state", pointer_to(@ctx.types.fetch("void"))),
        Types::Registry.parameter("listener", event_stateful_listener_function_type(event_type)),
      ],
      return_type: event_subscription_result_type,
    )
  when :event_unsubscribe
    Types::Registry.function(
      kind.to_s,
      params: [Types::Registry.parameter("subscription", @ctx.types.fetch("Subscription"))],
      return_type: @ctx.types.fetch("bool"),
    )
  when :event_emit
    params = []
    params << Types::Registry.parameter("payload", event_type.payload_type) if event_type.payload_type
    Types::Registry.function(kind.to_s, params:, return_type: @ctx.types.fetch("void"))
  when :event_wait
    Types::Registry.function(kind.to_s, params: [], return_type: Types::Registry.task(event_wait_result_type(event_type)))
  else
    raise LoweringError.new("unsupported event method #{kind}", line: 0, column: 0, path: @ctx.current_analysis_path)
  end
end

#event_next_generation_expression(slot_pointer_expr) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 882

def event_next_generation_expression(slot_pointer_expr)
  IR::Binary.new(
    operator: "+",
    left: event_slot_field_expression(slot_pointer_expr, "generation", @ctx.types.fetch("ptr_uint")),
    right: IR::IntegerLiteral.new(value: 1, type: @ctx.types.fetch("ptr_uint")),
    type: @ctx.types.fetch("ptr_uint"),
  )
end

#event_slot_activate_stateful_statements(slot_pointer_expr, runtime, generation_expr:, once:, state_expr:, wait_frame_expr:, listener_expr: nil) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 903

def event_slot_activate_stateful_statements(slot_pointer_expr, runtime, generation_expr:, once:, state_expr:, wait_frame_expr:, listener_expr: nil)
  statements = [
    IR::Assignment.new(target: event_slot_active_expression(slot_pointer_expr), operator: "=", value: IR::BooleanLiteral.new(value: true, type: @ctx.types.fetch("bool"))),
    IR::Assignment.new(target: event_slot_field_expression(slot_pointer_expr, "once", @ctx.types.fetch("bool")), operator: "=", value: IR::BooleanLiteral.new(value: once, type: @ctx.types.fetch("bool"))),
    IR::Assignment.new(target: event_slot_field_expression(slot_pointer_expr, "generation", @ctx.types.fetch("ptr_uint")), operator: "=", value: generation_expr),
    IR::Assignment.new(target: event_slot_field_expression(slot_pointer_expr, "state", runtime.fetch(:void_ptr)), operator: "=", value: state_expr),
  ]
  statements << IR::Assignment.new(target: event_slot_field_expression(slot_pointer_expr, "listener", runtime.fetch(:listener_type)), operator: "=", value: listener_expr) if listener_expr
  statements << IR::Assignment.new(target: event_slot_wait_frame_expression(slot_pointer_expr, runtime), operator: "=", value: wait_frame_expr)
  statements
end

#event_slot_activate_statements(slot_pointer_expr, runtime, generation_expr:, once:, wait_frame_expr:, listener_expr: nil) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 891

def event_slot_activate_statements(slot_pointer_expr, runtime, generation_expr:, once:, wait_frame_expr:, listener_expr: nil)
  statements = [
    IR::Assignment.new(target: event_slot_active_expression(slot_pointer_expr), operator: "=", value: IR::BooleanLiteral.new(value: true, type: @ctx.types.fetch("bool"))),
    IR::Assignment.new(target: event_slot_field_expression(slot_pointer_expr, "once", @ctx.types.fetch("bool")), operator: "=", value: IR::BooleanLiteral.new(value: once, type: @ctx.types.fetch("bool"))),
    IR::Assignment.new(target: event_slot_field_expression(slot_pointer_expr, "generation", @ctx.types.fetch("ptr_uint")), operator: "=", value: generation_expr),
    IR::Assignment.new(target: event_slot_field_expression(slot_pointer_expr, "state", runtime.fetch(:void_ptr)), operator: "=", value: IR::NullLiteral.new(type: runtime.fetch(:void_ptr))),
  ]
  statements << IR::Assignment.new(target: event_slot_field_expression(slot_pointer_expr, "listener", runtime.fetch(:listener_type)), operator: "=", value: listener_expr) if listener_expr
  statements << IR::Assignment.new(target: event_slot_wait_frame_expression(slot_pointer_expr, runtime), operator: "=", value: wait_frame_expr)
  statements
end

#event_slot_active_expression(slot_pointer_expr) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 858

def event_slot_active_expression(slot_pointer_expr)
  event_slot_field_expression(slot_pointer_expr, "active", @ctx.types.fetch("bool"))
end

#event_slot_clear_statements(slot_pointer_expr, runtime) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 915

def event_slot_clear_statements(slot_pointer_expr, runtime)
  [
    IR::Assignment.new(target: event_slot_active_expression(slot_pointer_expr), operator: "=", value: IR::BooleanLiteral.new(value: false, type: @ctx.types.fetch("bool"))),
    IR::Assignment.new(target: event_slot_field_expression(slot_pointer_expr, "once", @ctx.types.fetch("bool")), operator: "=", value: IR::BooleanLiteral.new(value: false, type: @ctx.types.fetch("bool"))),
    IR::Assignment.new(target: event_slot_wait_frame_expression(slot_pointer_expr, runtime), operator: "=", value: IR::NullLiteral.new(type: runtime.fetch(:void_ptr))),
  ]
end

#event_slot_field_expression(slot_pointer_expr, field_name, field_type) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 923

def event_slot_field_expression(slot_pointer_expr, field_name, field_type)
  IR::Member.new(receiver: slot_pointer_expr, member: field_name, type: field_type)
end

#event_slot_local_decl(event_expr, slot_index_expr, runtime, local_name: "__mt_slot") ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 849

def event_slot_local_decl(event_expr, slot_index_expr, runtime, local_name: "__mt_slot")
  IR::LocalDecl.new(
    name: local_name,
    linkage_name: local_name,
    type: runtime.fetch(:slot_pointer_type),
    value: event_slot_pointer_expression(event_expr, slot_index_expr, runtime),
  )
end

#event_slot_pointer_expression(event_expr, slot_index_expr, runtime) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 838

def event_slot_pointer_expression(event_expr, slot_index_expr, runtime)
  IR::AddressOf.new(
    expression: IR::Index.new(
      receiver: IR::Member.new(receiver: event_expr, member: "slots", type: runtime.fetch(:slots_type)),
      index: slot_index_expr,
      type: runtime.fetch(:slot_type),
    ),
    type: runtime.fetch(:slot_pointer_type),
  )
end

#event_slot_wait_frame_expression(slot_pointer_expr, runtime) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 862

def event_slot_wait_frame_expression(slot_pointer_expr, runtime)
  event_slot_field_expression(slot_pointer_expr, "wait_frame", runtime.fetch(:void_ptr))
end

#event_stateful_listener_call_expression(runtime, snapshots_expr, dispatch_index_expr, payload_expr) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 1014

def event_stateful_listener_call_expression(runtime, snapshots_expr, dispatch_index_expr, payload_expr)
  listener_type = runtime.fetch(:stateful_listener_type)
  listener_expr = IR::Cast.new(
    target_type: listener_type,
    expression: snapshot_field_expression(snapshots_expr, dispatch_index_expr, runtime, "listener", runtime.fetch(:void_ptr)),
    type: listener_type,
  )
  state_expr = snapshot_field_expression(snapshots_expr, dispatch_index_expr, runtime, "state", runtime.fetch(:void_ptr))
  arguments = [state_expr]
  arguments << payload_expr if runtime.fetch(:event_type).payload_type
  IR::Call.new(
    callee: listener_expr,
    arguments:,
    type: @ctx.types.fetch("void"),
  )
end

#event_stateful_listener_function_type(event_type) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 88

def event_stateful_listener_function_type(event_type)
  params = [Types::Registry.parameter("state", pointer_to(@ctx.types.fetch("void")))]
  params << Types::Registry.parameter("payload", event_type.payload_type) if event_type.payload_type
  Types::Registry.function("#{event_type.name}__stateful_listener", params:, return_type: @ctx.types.fetch("void"))
end

#event_subscription_literal(slot_expr, generation_expr) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 943

def event_subscription_literal(slot_expr, generation_expr)
  IR::AggregateLiteral.new(
    type: @ctx.types.fetch("Subscription"),
    fields: [
      IR::AggregateField.new(name: "slot", value: slot_expr),
      IR::AggregateField.new(name: "generation", value: generation_expr),
    ],
  )
end

#event_subscription_success_literal(result_type, slot_expr, generation_expr) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 953

def event_subscription_success_literal(result_type, slot_expr, generation_expr)
  IR::VariantLiteral.new(
    type: result_type,
    arm_name: "success",
    fields: [IR::AggregateField.new(name: "value", value: event_subscription_literal(slot_expr, generation_expr))],
  )
end

#event_task_literal(runtime, frame_expr) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 1031

def event_task_literal(runtime, frame_expr)
  raw_frame_expr = IR::Cast.new(target_type: runtime.fetch(:void_ptr), expression: frame_expr, type: runtime.fetch(:void_ptr))
  event_task_literal_from_raw_frame(runtime, raw_frame_expr)
end

#event_task_literal_from_raw_frame(runtime, raw_frame_expr) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 1040

def event_task_literal_from_raw_frame(runtime, raw_frame_expr)
  IR::AggregateLiteral.new(
    type: runtime.fetch(:task_type),
    fields: [
      IR::AggregateField.new(name: "frame", value: raw_frame_expr),
      IR::AggregateField.new(name: "ready", value: IR::Name.new(name: runtime.fetch(:wait_ready_linkage_name), type: runtime.fetch(:task_type).field("ready"), pointer: false)),
      IR::AggregateField.new(name: "set_waiter", value: IR::Name.new(name: runtime.fetch(:wait_set_waiter_linkage_name), type: runtime.fetch(:task_type).field("set_waiter"), pointer: false)),
      IR::AggregateField.new(name: "release", value: IR::Name.new(name: runtime.fetch(:wait_release_linkage_name), type: runtime.fetch(:task_type).field("release"), pointer: false)),
      IR::AggregateField.new(name: "take_result", value: IR::Name.new(name: runtime.fetch(:wait_take_result_linkage_name), type: runtime.fetch(:task_type).field("take_result"), pointer: false)),
    ],
  )
end

#event_unsubscribe_call(runtime, event_expr, subscription_expr) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 990

def event_unsubscribe_call(runtime, event_expr, subscription_expr)
  IR::Call.new(
    callee: runtime.fetch(:unsubscribe_linkage_name),
    arguments: [event_expr, subscription_expr],
    type: @ctx.types.fetch("void"),
  )
end

#event_wait_success_literal(result_type, payload_expr) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 961

def event_wait_success_literal(result_type, payload_expr)
  IR::VariantLiteral.new(
    type: result_type,
    arm_name: "success",
    fields: [IR::AggregateField.new(name: "value", value: payload_expr || void_value_expression)],
  )
end

#inactive_event_slot_continue_guard(slot_pointer_expr) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 874

def inactive_event_slot_continue_guard(slot_pointer_expr)
  IR::IfStmt.new(
    condition: IR::Unary.new(operator: "not", operand: event_slot_active_expression(slot_pointer_expr), type: @ctx.types.fetch("bool")),
    then_body: [IR::ContinueStmt.new],
    else_body: nil,
  )
end

#lower_event_storage_pointer(expression, env:) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 74

def lower_event_storage_pointer(expression, env:)
  event_type = infer_expression_type(expression, env:)
  IR::AddressOf.new(
    expression: lower_expression(expression, env:, expected_type: event_type),
    type: pointer_to(event_type),
  )
end

#snapshot_field_expression(snapshots_expr, index_expr, runtime, field_name, field_type) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 927

def snapshot_field_expression(snapshots_expr, index_expr, runtime, field_name, field_type)
  IR::Member.new(
    receiver: IR::Index.new(receiver: snapshots_expr, index: index_expr, type: runtime.fetch(:snapshot_type)),
    member: field_name,
    type: field_type,
  )
end

#subscription_field_expression(subscription_expr, field_name, field_type) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 935

def subscription_field_expression(subscription_expr, field_name, field_type)
  IR::Member.new(receiver: subscription_expr, member: field_name, type: field_type)
end

#void_value_expression ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 982

def void_value_expression
  IR::Cast.new(
    target_type: @ctx.types.fetch("void"),
    expression: IR::IntegerLiteral.new(value: 0, type: @ctx.types.fetch("int")),
    type: @ctx.types.fetch("void"),
  )
end

#wait_frame_field_expression(frame_expr, field_name, field_type) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/events.rb', line 939

def wait_frame_field_expression(frame_expr, field_name, field_type)
  IR::Member.new(receiver: frame_expr, member: field_name, type: field_type)
end