Merge remote-tracking branch 'origin/dev' into HEAD

# Conflicts:
#	tests/unit_tests/test_cpp_helpers.py

CODEOWNERS

@@ -741,7 +741,7 @@ esphome/components/web_server_idf/* @dentra
 esphome/components/weikai/* @DrCoolZic
 esphome/components/weikai_i2c/* @DrCoolZic
 esphome/components/weikai_spi/* @DrCoolZic
-esphome/components/whirlpool/* @arpena @glmnet @Rodrigoah
+esphome/components/whirlpool/* @arpena @glmnet
 esphome/components/whynter/* @aeonsablaze
 esphome/components/wiegand/* @ssieb
 esphome/components/wireguard/* @droscy @lhoracek @thomas0bernard

esphome/components/ethernet/ethernet_component.h

@@ -7,8 +7,6 @@
 #include "esphome/core/automation.h"
 #include "esphome/components/network/ip_address.h"
 
-#include <atomic>
-
 #ifdef USE_ETHERNET
 
 #ifdef USE_ESP32
@@ -368,9 +366,6 @@ class EthernetComponent final : public Component {
 
 #ifdef USE_ETHERNET_IP_STATE_LISTENERS
   StaticVector<EthernetIPStateListener *, ESPHOME_ETHERNET_IP_STATE_LISTENERS> ip_state_listeners_;
-#ifdef USE_ESP32
-  std::atomic<uint8_t> ip_state_pending_{0};
-#endif
 #endif
 
 #ifdef USE_ETHERNET_CONNECT_TRIGGER

esphome/components/ethernet/ethernet_component_esp32.cpp

@@ -129,14 +129,6 @@ void EthernetComponent::log_error_and_mark_failed_(esp_err_t err, const char *me
 void EthernetComponent::loop() {
   const uint32_t now = App.get_loop_component_start_time();
 
-#ifdef USE_ETHERNET_IP_STATE_LISTENERS
-  // The IP events arrive on the event task; the listeners publish states, so notify them here
-  if (this->ip_state_pending_.load(std::memory_order_acquire) != 0) {
-    this->ip_state_pending_.store(0, std::memory_order_relaxed);
-    this->notify_ip_state_listeners_();
-  }
-#endif
-
   switch (this->state_) {
     case EthernetComponentState::STOPPED:
       if (this->started_) {
@@ -778,8 +770,7 @@ void EthernetComponent::eth_event_handler(void *arg, esp_event_base_t event_base
       event_name = "ETH connected";
       // For static IP configurations, GOT_IP event may not fire, so notify IP listeners here
 #if defined(USE_ETHERNET_IP_STATE_LISTENERS) && defined(USE_ETHERNET_MANUAL_IP)
-      global_eth_component->ip_state_pending_.store(1, std::memory_order_release);
-      global_eth_component->enable_loop_soon_any_context();
+      global_eth_component->notify_ip_state_listeners_();
 #endif
 #if USE_NETWORK_IPV6
       // Start SLAAC on link-up, not after the DHCPv4 lease. This also restores the
@@ -807,9 +798,6 @@ void EthernetComponent::got_ip_event_handler(void *arg, esp_event_base_t event_b
   const esp_netif_ip_info_t *ip_info = &event->ip_info;
   ESP_LOGV(TAG, "[Ethernet event] ETH Got IP " IPSTR, IP2STR(&ip_info->ip));
   global_eth_component->got_ipv4_address_ = true;
-#ifdef USE_ETHERNET_IP_STATE_LISTENERS
-  global_eth_component->ip_state_pending_.store(1, std::memory_order_release);
-#endif
 #if USE_NETWORK_IPV6 && (USE_NETWORK_MIN_IPV6_ADDR_COUNT > 0)
   global_eth_component->connected_ = global_eth_component->ipv6_count_ >= USE_NETWORK_MIN_IPV6_ADDR_COUNT;
   global_eth_component->enable_loop_soon_any_context();  // Enable loop when connection state changes
@@ -817,6 +805,9 @@ void EthernetComponent::got_ip_event_handler(void *arg, esp_event_base_t event_b
   global_eth_component->connected_ = true;
   global_eth_component->enable_loop_soon_any_context();  // Enable loop when connection state changes
 #endif /* USE_NETWORK_IPV6 */
+#ifdef USE_ETHERNET_IP_STATE_LISTENERS
+  global_eth_component->notify_ip_state_listeners_();
+#endif
 }
 
 #if USE_NETWORK_IPV6
@@ -828,9 +819,6 @@ void EthernetComponent::got_ip6_event_handler(void *arg, esp_event_base_t event_
   // after a link flap fires another event for the same address.
   struct esp_ip6_addr if_ip6s[CONFIG_LWIP_IPV6_NUM_ADDRESSES];
   global_eth_component->ipv6_count_ = esp_netif_get_all_ip6(global_eth_component->eth_netif_, if_ip6s);
-#ifdef USE_ETHERNET_IP_STATE_LISTENERS
-  global_eth_component->ip_state_pending_.store(1, std::memory_order_release);
-#endif
 #if (USE_NETWORK_MIN_IPV6_ADDR_COUNT > 0)
   global_eth_component->connected_ =
       global_eth_component->got_ipv4_address_ && (global_eth_component->ipv6_count_ >= USE_NETWORK_MIN_IPV6_ADDR_COUNT);
@@ -839,6 +827,9 @@ void EthernetComponent::got_ip6_event_handler(void *arg, esp_event_base_t event_
   global_eth_component->connected_ = global_eth_component->got_ipv4_address_;
   global_eth_component->enable_loop_soon_any_context();  // Enable loop when connection state changes
 #endif
+#ifdef USE_ETHERNET_IP_STATE_LISTENERS
+  global_eth_component->notify_ip_state_listeners_();
+#endif
 }
 #endif /* USE_NETWORK_IPV6 */
 

esphome/components/whirlpool/climate.py

@@ -5,15 +5,13 @@ from esphome.const import CONF_MODEL
 from esphome.types import ConfigType
 
 AUTO_LOAD = ["climate_ir"]
-CODEOWNERS = ["@glmnet", "@arpena", "@Rodrigoah"]
+CODEOWNERS = ["@glmnet", "@arpena"]
 
 whirlpool_ns = cg.esphome_ns.namespace("whirlpool")
 WhirlpoolClimate = whirlpool_ns.class_("WhirlpoolClimate", climate_ir.ClimateIR)
 
 Model = whirlpool_ns.enum("Model")
-MODELS = Model.options(
-    "DG11J1-3A", "DG11J1-91", "HISENSE_ARG", "HITACHI_HCRA31NEWH", prefix="MODEL_"
-)
+MODELS = Model.options("DG11J1-3A", "DG11J1-91", "HISENSE_ARG", prefix="MODEL_")
 
 CONFIG_SCHEMA = climate_ir.climate_ir_with_receiver_schema(WhirlpoolClimate).extend(
     {
@@ -28,5 +26,3 @@ async def to_code(config: ConfigType) -> None:
     # cv.enum keeps the YAML key as a str subclass; the MockObj value cannot be compared
     if config[CONF_MODEL] == "HISENSE_ARG":
         cg.add_define("USE_WHIRLPOOL_HISENSE_ARG")
-    elif config[CONF_MODEL] == "HITACHI_HCRA31NEWH":
-        cg.add_define("USE_WHIRLPOOL_HITACHI_HCRA31NEWH")

esphome/components/whirlpool/whirlpool.cpp

@@ -2,8 +2,6 @@
 #include "esphome/core/helpers.h"
 #include "esphome/core/log.h"
 
-#include <algorithm>
-
 namespace esphome::whirlpool {
 
 ESPHOME_LOG_TAG(TAG, "whirlpool.climate");
@@ -46,17 +44,6 @@ static constexpr uint8_t HISENSE_ARG_POWER_TOGGLE = 0x01;   // byte 15
 static constexpr uint8_t HISENSE_ARG_SETTINGS_ONLY = 0x02;  // byte 15
 static constexpr uint8_t HISENSE_ARG_FIXED_TEMP_STEP = 7;   // auto and fan-only send 23 C
 
-// Hitachi HCRA31NEWH model: power is a state in every frame
-static constexpr uint8_t HITACHI_BYTE10 = 0x20;      // byte 10
-static constexpr uint8_t HITACHI_COOL = 0x02;        // byte 15
-static constexpr uint8_t HITACHI_OFF = 0x01;         // byte 15
-static constexpr uint8_t HITACHI_BYTE18_ON = 0x38;   // byte 18
-static constexpr uint8_t HITACHI_BYTE18_OFF = 0x28;  // byte 18
-static constexpr uint8_t HITACHI_BYTE19 = 0x08;      // byte 19
-
-// Header, 21 bytes of 8 bits, two dividers and the footer mark
-static constexpr uint32_t WHIRLPOOL_FRAME_TIMINGS = 2 + WHIRLPOOL_STATE_LENGTH * 16 + 2 * 2 + 1;
-
 WhirlpoolClimate::WhirlpoolClimate()
     : climate_ir::ClimateIR(
           WHIRLPOOL_DG11J1_3A_TEMP_MIN, WHIRLPOOL_DG11J1_3A_TEMP_MAX, 1.0f, true, true,
@@ -68,19 +55,19 @@ void WhirlpoolClimate::transmit_state() {
   this->last_transmit_time_ = millis();  // setting the time of the last transmission.
   uint8_t remote_state[WHIRLPOOL_STATE_LENGTH];
   memset(remote_state, 0, sizeof(remote_state));
-  put_be16(remote_state, this->remote_id_());
+  remote_state[0] = 0x83;
+  remote_state[1] = 0x06;
   remote_state[6] = 0x80;
-  remote_state[18] = 0x08;
+  remote_state[18] = 0x08;  // the same on every supported model
 
-  const bool powered_on = this->mode != climate::CLIMATE_MODE_OFF;
-  // Hitachi sends power as a state instead of a toggle
-  const bool power_toggle = !this->is_hitachi_hcra31newh_() && powered_on != this->powered_on_assumed;
+  auto powered_on = this->mode != climate::CLIMATE_MODE_OFF;
+  const bool power_toggle = powered_on != this->powered_on_assumed;
   if (power_toggle) {
     // Set power toggle command
     remote_state[2] = 4;
     remote_state[15] = 1;
+    this->powered_on_assumed = powered_on;
   }
-  this->powered_on_assumed = powered_on;
   switch (this->mode) {
     case climate::CLIMATE_MODE_HEAT_COOL:
       // set fan auto
@@ -106,10 +93,6 @@ void WhirlpoolClimate::transmit_state() {
       remote_state[15] = 6;
       break;
     case climate::CLIMATE_MODE_OFF:
-      // These remotes keep the cool code in the power-off frame
-      if (this->is_hisense_arg_() || this->is_hitachi_hcra31newh_())
-        remote_state[3] = WHIRLPOOL_COOL;
-      break;
     default:
       break;
   }
@@ -119,7 +102,6 @@ void WhirlpoolClimate::transmit_state() {
   // Temperature
   auto temp = (uint8_t) roundf(clamp(this->target_temperature, this->temperature_min_(), this->temperature_max_()));
   const auto temp_step = (uint8_t) (temp - this->temperature_min_());
-  this->target_temperature = temp;  // publish what the unit was sent
   if (hisense_arg && this->fixed_temp_mode_()) {
     remote_state[3] |= HISENSE_ARG_FIXED_TEMP_STEP << 4;
   } else {
@@ -149,6 +131,7 @@ void WhirlpoolClimate::transmit_state() {
       remote_state[2] |= WHIRLPOOL_SWING_MASK;
       remote_state[8] = WHIRLPOOL_SWING_BYTE8;
     }
+    this->encode_hisense_arg_(remote_state, power_toggle, temp_step);
   } else if (this->send_swing_cmd_) {
     if (this->swing_mode == climate::CLIMATE_SWING_VERTICAL || this->swing_mode == climate::CLIMATE_SWING_OFF) {
       remote_state[2] |= WHIRLPOOL_SWING_MASK;
@@ -156,11 +139,6 @@ void WhirlpoolClimate::transmit_state() {
     }
   }
 
-  if (hisense_arg)
-    this->encode_hisense_arg_(remote_state, power_toggle, temp_step);
-  if (this->is_hitachi_hcra31newh_())
-    this->encode_hitachi_hcra31newh_(remote_state);
-
   // Checksum
   remote_state[13] = xor_bytes(&remote_state[2], 11, remote_state[13]);
   remote_state[20] = xor_bytes(&remote_state[14], 6, remote_state[20]);
@@ -170,7 +148,6 @@ void WhirlpoolClimate::transmit_state() {
   // Send code
   auto transmit = this->transmitter_->transmit();
   auto *data = transmit.get_data();
-  data->reserve(WHIRLPOOL_FRAME_TIMINGS);
 
   data->set_carrier_frequency(38000);
 
@@ -203,6 +180,10 @@ void WhirlpoolClimate::encode_hisense_arg_(uint8_t *remote_state, bool power_tog
   remote_state[15] = power_toggle ? HISENSE_ARG_POWER_TOGGLE : HISENSE_ARG_SETTINGS_ONLY;
 
   switch (this->mode) {
+    case climate::CLIMATE_MODE_OFF:
+      // The remote keeps the cool code in the power-off frame
+      remote_state[3] = (remote_state[3] & 0xF0) | WHIRLPOOL_COOL;
+      break;
     case climate::CLIMATE_MODE_DRY:
       // The unit runs these fan speeds itself; the user's choice is kept for the next mode change
       remote_state[2] &= ~WHIRLPOOL_FAN_MASK;
@@ -231,27 +212,6 @@ void WhirlpoolClimate::encode_hisense_arg_(uint8_t *remote_state, bool power_tog
 #endif
 }
 
-void WhirlpoolClimate::encode_hitachi_hcra31newh_(uint8_t *remote_state) const {
-#ifdef USE_WHIRLPOOL_HITACHI_HCRA31NEWH
-  remote_state[10] = HITACHI_BYTE10;
-  remote_state[18] = HITACHI_BYTE18_ON;
-  remote_state[19] = HITACHI_BYTE19;
-  // The unit takes the whole state from every frame: only the off frame carries the power bit
-  switch (this->mode) {
-    case climate::CLIMATE_MODE_COOL:
-      remote_state[15] = HITACHI_COOL;
-      break;
-    case climate::CLIMATE_MODE_OFF:
-      remote_state[2] |= WHIRLPOOL_POWER;
-      remote_state[15] = HITACHI_OFF;
-      remote_state[18] = HITACHI_BYTE18_OFF;
-      break;
-    default:
-      break;
-  }
-#endif
-}
-
 bool WhirlpoolClimate::on_receive(remote_base::RemoteReceiveData data) {
   // Check if the esp isn't currently transmitting.
   if (millis() - this->last_transmit_time_ < 500) {
@@ -274,8 +234,7 @@ bool WhirlpoolClimate::on_receive(remote_base::RemoteReceiveData data) {
       if (!data.expect_item(WHIRLPOOL_BIT_MARK, WHIRLPOOL_GAP))
         return false;
     }
-    // The Hitachi remote always sends all 21 bytes; byte 18 holds its power state
-    if (i == WHIRLPOOL_SECOND_DIVIDER && !data.is_valid() && !this->is_hitachi_hcra31newh_()) {
+    if (i == WHIRLPOOL_SECOND_DIVIDER && !data.is_valid()) {
       // Remote control only sent 14 bytes, nothing more to read, not even the footer
       ESP_LOGV(TAG, "Remote control only sent %d bytes", i);
       skip_footer = true;
@@ -302,18 +261,13 @@ bool WhirlpoolClimate::on_receive(remote_base::RemoteReceiveData data) {
   ESP_LOGV_HEX(TAG, remote_state, WHIRLPOOL_STATE_LENGTH, WHIRLPOOL_STATE_LENGTH, "Received: %s");
 
   // verify header remote code
-  if (encode_uint16(remote_state[0], remote_state[1]) != this->remote_id_())
+  if (remote_state[0] != 0x83 || remote_state[1] != 0x06)
     return false;
 
   // powr on/off button
   ESP_LOGV(TAG, "Power: %02X", (remote_state[2] & WHIRLPOOL_POWER));
 
-  if (this->is_hitachi_hcra31newh_()) {
-    // Power is a state: byte 18 says whether the unit is off
-    this->powered_on_assumed = remote_state[18] != HITACHI_BYTE18_OFF;
-    if (!this->powered_on_assumed)
-      this->mode = climate::CLIMATE_MODE_OFF;
-  } else if ((remote_state[2] & WHIRLPOOL_POWER) == WHIRLPOOL_POWER) {
+  if ((remote_state[2] & WHIRLPOOL_POWER) == WHIRLPOOL_POWER) {
     auto powered_on = this->mode != climate::CLIMATE_MODE_OFF;
 
     if (powered_on) {
@@ -355,7 +309,7 @@ bool WhirlpoolClimate::on_receive(remote_base::RemoteReceiveData data) {
     int temp = remote_state[3] & 0xF0;
     ESP_LOGVV(TAG, "Temperature Raw: %02X", temp);
     temp = (uint8_t) temp >> 4;
-    temp = std::min(temp + static_cast<int>(this->temperature_min_()), static_cast<int>(this->temperature_max_()));
+    temp += static_cast<int>(this->temperature_min_());
     ESP_LOGVV(TAG, "Temperature Climate: %u", temp);
     this->target_temperature = temp;
   }

esphome/components/whirlpool/whirlpool.h

@@ -6,10 +6,9 @@ namespace esphome::whirlpool {
 
 /// Simple enum to represent models.
 enum Model {
-  MODEL_DG11J1_3A = 0,           /// Temperature range is from 18 to 32
-  MODEL_DG11J1_91 = 1,           /// Temperature range is from 16 to 30
-  MODEL_HISENSE_ARG = 2,         /// Hisense/BGH (Argentina), 16 to 30
-  MODEL_HITACHI_HCRA31NEWH = 3,  /// Hitachi with the HCRA31NEWH remote, 16 to 30
+  MODEL_DG11J1_3A = 0,    /// Temperature range is from 18 to 32
+  MODEL_DG11J1_91 = 1,    /// Temperature range is from 16 to 30
+  MODEL_HISENSE_ARG = 2,  /// Hisense/BGH (Argentina), 16 to 30
 };
 
 // Temperature
@@ -30,9 +29,7 @@ class WhirlpoolClimate final : public climate_ir::ClimateIR {
 
   /// Override control to change settings of the climate device.
   void control(const climate::ClimateCall &call) override {
-    // The toggle remotes flip swing on every press, so only send one when the mode really changes
-    auto swing = call.get_swing_mode();
-    this->send_swing_cmd_ = swing.has_value() && *swing != this->swing_mode;
+    send_swing_cmd_ = call.get_swing_mode().has_value();
     climate_ir::ClimateIR::control(call);
   }
 
@@ -58,22 +55,10 @@ class WhirlpoolClimate final : public climate_ir::ClimateIR {
     return false;
 #endif
   }
-  /// False when the model is compiled out, so the compiler drops the Hitachi branches.
-  bool is_hitachi_hcra31newh_() const {
-#ifdef USE_WHIRLPOOL_HITACHI_HCRA31NEWH
-    return this->model_ == MODEL_HITACHI_HCRA31NEWH;
-#else
-    return false;
-#endif
-  }
-  /// The remote ID sent in bytes 0 and 1.
-  uint16_t remote_id_() const { return this->is_hitachi_hcra31newh_() ? 0xA959 : 0x8306; }
   /// Modes in which the Hisense ARG model sends a fixed temperature.
   bool fixed_temp_mode_() const;
   /// Add the Hisense ARG bytes on top of the common whirlpool frame.
   void encode_hisense_arg_(uint8_t *remote_state, bool power_toggle, uint8_t temp_step) const;
-  /// Add the Hitachi HCRA31NEWH bytes on top of the common whirlpool frame.
-  void encode_hitachi_hcra31newh_(uint8_t *remote_state) const;
   /// Set the time of the last transmission.
   uint32_t last_transmit_time_{};
 

esphome/components/wifi/wifi_component.h

@@ -563,7 +563,7 @@ class WiFiComponent final : public Component {
   // (In most use cases you won't need these)
   /// Setup WiFi interface.
   void setup() override;
-#if defined(USE_ESP32) || defined(USE_LN882X) || defined(USE_BK72XX)
+#if defined(USE_LN882X) || defined(USE_BK72XX)
   void on_powerdown() override;
 #endif
   void start();

esphome/components/wifi/wifi_component_esp_idf.cpp

@@ -1635,21 +1635,6 @@ bool WiFiComponent::wifi_dpp_start_listen_() {
 void WiFiComponent::wifi_dpp_stop_listen_() { esp_supp_dpp_stop_listen(); }
 #endif
 
-void WiFiComponent::on_powerdown() {
-  // Leave the AP before esp_restart() or deep sleep stops Wi-Fi. esp_wifi_stop() while associated
-  // makes the ESP32 retransmit its Disassociation up to the retry limit although the AP ACKs it
-  // (32 copies with protected management frames), which some APs handle badly.
-  // Upstream bug: https://github.com/espressif/esp-idf/issues/19443 - remove this once it is fixed
-  // in the ESP-IDF versions we support.
-  // Ask the driver: s_sta_connected lags until the main loop has handled the connect event.
-  wifi_ap_record_t ap_info;
-  if (esp_wifi_sta_get_ap_info(&ap_info) != ESP_OK)
-    return;
-  ESP_LOGD(TAG, "Disconnecting before powerdown");
-  esp_wifi_disconnect();
-  delay(100);  // NOLINT: once per reboot or deep sleep, lets the disassociation go out
-}
-
 bool WiFiComponent::wifi_disconnect_() { return esp_wifi_disconnect(); }
 
 bssid_t WiFiComponent::wifi_bssid() {

esphome/core/application.cpp

@@ -294,8 +294,6 @@ void Application::reboot() {
   for (auto &component : std::ranges::reverse_view(this->components_)) {
     component->on_shutdown();
   }
-  // No teardown on a forced reboot, but still power hardware down (Wi-Fi leaves the AP)
-  this->run_powerdown_hooks();
   arch_restart();
 }
 void Application::safe_reboot() {

esphome/core/component.h

@@ -185,12 +185,10 @@ class Component {
    */
   virtual bool teardown() { return true; }
 
-  /** Called last before a reboot or deep sleep to power down hardware.
+  /** Called after teardown is complete to power down hardware.
    *
-   * On a safe shutdown this is called after all components have finished their teardown process,
+   * This is called after all components have finished their teardown process,
    * making it safe to power down hardware like ethernet PHY.
-   * On a forced reboot (Application::reboot()) it is called right after on_shutdown() with no
-   * teardown, so implementations must not assume teardown() has run.
    */
   virtual void on_powerdown() {}
 

esphome/core/config.py

@@ -1,6 +1,5 @@
 from __future__ import annotations
 
-from collections import Counter
 import logging
 import os
 from pathlib import Path
@@ -60,6 +59,7 @@ from esphome.core import (
     TimePeriodMilliseconds,
     coroutine_with_priority,
 )
+from esphome.cpp_helpers import add_component_counts
 import esphome.final_validate as fv
 from esphome.helpers import (
     copy_file_if_changed,
@@ -843,36 +843,6 @@ async def _add_controller_registry_dispatch() -> None:
     cg.add_global(cg.RawStatement('#include "esphome/core/controller_dispatch.h"'))
 
 
-@coroutine_with_priority(CoroPriority.FINAL)
-async def _add_looping_components() -> None:
-    # Emit ESPHOME_LOOPING_COMPONENT_COUNT and its storage. Sizing of looping_components_
-    # happens in core to_code() so it lands before safe_mode's early return.
-    entries = CORE.data.get("looping_component_entries", [])
-
-    # Build constexpr sum for the exact count, deduplicating by type
-    # Uses HasLoopOverride<T> which handles ambiguous &T::loop from multiple inheritance
-    type_counts = Counter(entries)
-    terms = [
-        f"({count} * HasLoopOverride<{cpp_type}>::value)"
-        for cpp_type, count in type_counts.items()
-    ] or ["0"]
-    constexpr_expr = " + \\\n  ".join(terms)
-    cg.add_global(
-        cg.RawStatement(
-            f"static constexpr size_t ESPHOME_LOOPING_COMPONENT_COUNT = \\\n"
-            f"  {constexpr_expr};"
-        )
-    )
-    # In namespace esphome so analyze-memory counts it as core; sized at least 1 to avoid a zero-length array
-    cg.add_global(
-        cg.RawStatement(
-            "namespace esphome {\n"
-            "static Component *looping_components_storage[std::max<size_t>(ESPHOME_LOOPING_COMPONENT_COUNT, 1)];\n"
-            "}  // namespace esphome"
-        )
-    )
-
-
 @coroutine_with_priority(CoroPriority.CORE)
 async def to_code(config: ConfigType) -> None:
     # using namespace esphome is hardcoded in writer.py to guarantee it
@@ -912,11 +882,10 @@ async def to_code(config: ConfigType) -> None:
     if name_add_mac_suffix:
         cg.add_define("ESPHOME_NAME_ADD_MAC_SUFFIX")
     cg.add(cg.App.pre_setup(name_expr, name_len, friendly_expr, friendly_len))
-    # Define component count for static allocation
-    cg.add_define("ESPHOME_COMPONENT_COUNT", len(CORE.component_ids))
+    CORE.add_job(add_component_counts)
 
     # Pre-init the list with exact capacity so calculate_looping_components_()
-    # can skip the counting pass; the storage is emitted by _add_looping_components()
+    # can skip the counting pass; the storage is emitted by add_component_counts()
     cg.add(
         cg.RawExpression(
             "App.looping_components_.init(std::span<Component *>("
@@ -926,7 +895,6 @@ async def to_code(config: ConfigType) -> None:
 
     CORE.add_job(_add_platform_defines)
     CORE.add_job(_add_controller_registry_dispatch)
-    CORE.add_job(_add_looping_components)
 
     CORE.add_job(_add_automations, config)
 

esphome/core/defines.h

@@ -387,7 +387,6 @@
 #define USE_WATER_HEATER
 #define USE_WATER_HEATER_VISUAL_OVERRIDES
 #define USE_WHIRLPOOL_HISENSE_ARG
-#define USE_WHIRLPOOL_HITACHI_HCRA31NEWH
 #define USE_ZWAVE_PROXY
 
 // Feature flags which do not work for zephyr

esphome/cpp_helpers.py

@@ -1,3 +1,4 @@
+from collections import Counter
 from collections.abc import Awaitable, Callable, Hashable
 from dataclasses import dataclass, field
 import logging
@@ -60,6 +61,58 @@ def _get_source_pool() -> ComponentSourcePool:
     return CORE.data[_COMPONENT_SOURCE_DOMAIN]
 
 
+_REGISTERED_COMPONENTS_DOMAIN = "registered_components"
+
+# Below every finite priority, so the job runs only once every other job,
+# including FINAL ones and to_code tasks pushed down by waiting, is done.
+_AFTER_ALL_JOBS = float("-inf")
+
+
+@dataclass
+class _RegisteredComponents:
+    """C++ type of each register_component() call, which sizes App.components_
+    and App.looping_components_."""
+
+    types: list[str] = field(default_factory=list)
+    emitted: bool = False
+
+
+def _get_registered_components() -> _RegisteredComponents:
+    if _REGISTERED_COMPONENTS_DOMAIN not in CORE.data:
+        CORE.data[_REGISTERED_COMPONENTS_DOMAIN] = _RegisteredComponents()
+    return CORE.data[_REGISTERED_COMPONENTS_DOMAIN]
+
+
+@coroutine_with_priority(_AFTER_ALL_JOBS)
+async def add_component_counts() -> None:
+    """Emit ESPHOME_COMPONENT_COUNT and ESPHOME_LOOPING_COMPONENT_COUNT from the
+    components actually registered; declared but unregistered ids take no slot."""
+    registered = _get_registered_components()
+    registered.emitted = True
+    add_define("ESPHOME_COMPONENT_COUNT", len(registered.types))
+    # Exact looping count, summed per type at C++ compile time. HasLoopOverride<T>
+    # handles an ambiguous &T::loop from multiple inheritance.
+    terms = [
+        f"({count} * HasLoopOverride<{cpp_type}>::value)"
+        for cpp_type, count in Counter(registered.types).items()
+    ] or ["0"]
+    constexpr_expr = " + \\\n  ".join(terms)
+    add_global(
+        RawStatement(
+            f"static constexpr size_t ESPHOME_LOOPING_COMPONENT_COUNT = \\\n"
+            f"  {constexpr_expr};"
+        )
+    )
+    # In namespace esphome so analyze-memory counts it as core; at least 1 to avoid a zero-length array
+    add_global(
+        RawStatement(
+            "namespace esphome {\n"
+            "static Component *looping_components_storage[std::max<size_t>(ESPHOME_LOOPING_COMPONENT_COUNT, 1)];\n"
+            "}  // namespace esphome"
+        )
+    )
+
+
 def _ensure_source_table_registered() -> None:
     """Schedule the table generation job (once)."""
     pool = _get_source_pool()
@@ -441,6 +494,11 @@ async def register_component(var, config):
         raise ValueError(
             f"Component ID {id_} was not declared to inherit from Component, or was registered twice. Please create a bug report with your configuration."
         )
+    registered = _get_registered_components()
+    if registered.emitted:
+        raise ValueError(
+            f"Component ID {id_} was registered after ESPHOME_COMPONENT_COUNT was emitted. Please create a bug report with your configuration."
+        )
     CORE.component_ids.remove(id_)
     if CONF_SETUP_PRIORITY in config:
         set_setup_priority(var, config[CONF_SETUP_PRIORITY])
@@ -475,9 +533,7 @@ async def register_component(var, config):
     else:
         add(App.register_component_(var))
 
-    # Collect C++ type for compile-time looping component count
-    comp_entries = CORE.data.setdefault("looping_component_entries", [])
-    comp_entries.append(str(var.base.type))
+    registered.types.append(str(var.base.type))
 
     return var
 

tests/components/ethernet_info/test.esp32-idf.yaml

@@ -2,7 +2,3 @@ packages:
   i2c: !include ../../test_build_components/common/i2c/esp32-idf.yaml
 
 <<: !include common.yaml
-
-# IPv6 with an IP sensor: compiles the IPv6 event handler's listener notification
-network:
-  enable_ipv6: true

tests/components/whirlpool/__init__.py

@@ -10,8 +10,7 @@ def override_manifest(manifest: ComponentManifestOverride) -> None:
     manifest.auto_load = ["climate_ir", "climate"]
 
     async def to_code_testing(config: ConfigType) -> None:
-        # Compiles in the Hisense ARG and Hitachi models, which climate.py adds only when configured
+        # Compiles in the Hisense ARG model, which climate.py adds only when it is configured
         cg.add_define("USE_WHIRLPOOL_HISENSE_ARG")
-        cg.add_define("USE_WHIRLPOOL_HITACHI_HCRA31NEWH")
 
     manifest.to_code = to_code_testing

tests/components/whirlpool/common.yaml

@@ -8,8 +8,3 @@ climate:
     model: HISENSE_ARG
     transmitter_id: xmitr
     receiver_id: rcvr
-  - platform: whirlpool
-    name: Whirlpool Hitachi HCRA31NEWH Climate
-    model: HITACHI_HCRA31NEWH
-    transmitter_id: xmitr
-    receiver_id: rcvr

tests/components/whirlpool/whirlpool_tests.cpp

@@ -252,9 +252,6 @@ TEST(WhirlpoolHisenseArg, SwingIsSentOnEveryTransmit) {
 
 TEST(WhirlpoolDG11J13A, SwingIsSentOnlyWhenItChanges) {
   Fixture f(MODEL_DG11J1_3A);
-  f.command(climate::CLIMATE_MODE_COOL, 24, climate::CLIMATE_FAN_LOW, climate::CLIMATE_SWING_OFF);
-  EXPECT_EQ(f.last_frame()[2] & 0x80, 0) << "swing is already off";
-
   f.command(climate::CLIMATE_MODE_COOL, 24, climate::CLIMATE_FAN_LOW, climate::CLIMATE_SWING_VERTICAL);
   Frame frame = f.last_frame();
   EXPECT_EQ(frame[2] & 0x80, 0x80);
@@ -264,9 +261,6 @@ TEST(WhirlpoolDG11J13A, SwingIsSentOnlyWhenItChanges) {
   frame = f.last_frame();
   EXPECT_EQ(frame[2] & 0x80, 0);
   EXPECT_EQ(frame[8], 0x00);
-
-  f.command(climate::CLIMATE_MODE_COOL, 25, climate::CLIMATE_FAN_LOW, climate::CLIMATE_SWING_VERTICAL);
-  EXPECT_EQ(f.last_frame()[2] & 0x80, 0) << "swing is already vertical";
 }
 
 // Cool 24 C (step 8), fan low, powered on assumed
@@ -391,90 +385,4 @@ TEST(WhirlpoolHisenseArg, EveryTransmitHasValidChecksums) {
   }
 }
 
-// Cool 24 C (step 8), fan low, unit on
-static Frame hitachi_cool_frame() {
-  return with_checksums({0xA9, 0x59, 0x03, 0x82, 0x00, 0x00, 0x80, 0x00, 0x00, 0x00, 0x20,
-                         0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x38, 0x08, 0x00});
-}
-
-// The off frame: power bit, cool code, byte 15 0x01 and byte 18 0x28
-static Frame hitachi_off_frame() {
-  return with_checksums({0xA9, 0x59, 0x07, 0x82, 0x00, 0x00, 0x80, 0x00, 0x00, 0x00, 0x20,
-                         0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x28, 0x08, 0x00});
-}
-
-TEST(WhirlpoolHitachiHCRA31NEWH, CoolAndOffMatchKnownFrames) {
-  Fixture f(MODEL_HITACHI_HCRA31NEWH);
-  f.command(climate::CLIMATE_MODE_COOL, 24, climate::CLIMATE_FAN_LOW);
-  // Turning on sends the full state with no power bit
-  expect_frame(f.last_frame(), hitachi_cool_frame());
-
-  f.command(climate::CLIMATE_MODE_OFF, 24, climate::CLIMATE_FAN_LOW);
-  expect_frame(f.last_frame(), hitachi_off_frame());
-
-  // A second off command still sends the power bit
-  f.command(climate::CLIMATE_MODE_OFF, 24, climate::CLIMATE_FAN_LOW);
-  EXPECT_EQ(f.last_frame()[2] & 0x04, 0x04);
-
-  f.command(climate::CLIMATE_MODE_HEAT, 24, climate::CLIMATE_FAN_LOW);
-  const Frame frame = f.last_frame();
-  EXPECT_EQ(frame[2] & 0x04, 0);
-  EXPECT_EQ(frame[3], 0x80);
-  EXPECT_EQ(frame[15], 0x06);
-  EXPECT_EQ(frame[18], 0x38);
-}
-
-TEST(WhirlpoolHitachiHCRA31NEWH, ReceivePowerIsAState) {
-  Fixture f(MODEL_HITACHI_HCRA31NEWH);
-  ASSERT_EQ(f.climate.mode, climate::CLIMATE_MODE_OFF);
-
-  // An on frame restores the mode even though it has no power bit
-  EXPECT_TRUE(receive(f.climate, hitachi_cool_frame()));
-  EXPECT_EQ(f.climate.mode, climate::CLIMATE_MODE_COOL);
-  EXPECT_FLOAT_EQ(f.climate.target_temperature, 24);
-  EXPECT_EQ(f.climate.fan_mode, climate::CLIMATE_FAN_LOW);
-  // The same frame again keeps it on
-  EXPECT_TRUE(receive(f.climate, hitachi_cool_frame()));
-  EXPECT_EQ(f.climate.mode, climate::CLIMATE_MODE_COOL);
-
-  EXPECT_TRUE(receive(f.climate, hitachi_off_frame()));
-  EXPECT_EQ(f.climate.mode, climate::CLIMATE_MODE_OFF);
-  // A repeated off frame does not toggle
-  EXPECT_TRUE(receive(f.climate, hitachi_off_frame()));
-  EXPECT_EQ(f.climate.mode, climate::CLIMATE_MODE_OFF);
-}
-
-TEST(WhirlpoolHitachiHCRA31NEWH, ReceiveChecksRemoteId) {
-  Fixture hitachi(MODEL_HITACHI_HCRA31NEWH);
-  EXPECT_FALSE(receive(hitachi.climate, hisense_cool_frame()));
-  Fixture whirlpool(MODEL_DG11J1_91);
-  EXPECT_FALSE(receive(whirlpool.climate, hitachi_cool_frame()));
-}
-
-TEST(WhirlpoolHitachiHCRA31NEWH, ReceivedTemperatureIsClamped) {
-  Fixture f(MODEL_HITACHI_HCRA31NEWH);
-  Frame frame = hitachi_cool_frame();
-  frame[3] = 0xF2;  // step 15 would be 31 C
-  EXPECT_TRUE(receive(f.climate, with_checksums(frame)));
-  EXPECT_FLOAT_EQ(f.climate.target_temperature, 30);
-}
-
-TEST(WhirlpoolDG11J13A, TargetIsClampedAndRoundedToWhatWasSent) {
-  Fixture f(MODEL_DG11J1_3A);
-  f.command(climate::CLIMATE_MODE_COOL, 35, climate::CLIMATE_FAN_LOW);
-  EXPECT_FLOAT_EQ(f.climate.target_temperature, 32);
-  f.command(climate::CLIMATE_MODE_COOL, 24.4f, climate::CLIMATE_FAN_LOW);
-  EXPECT_FLOAT_EQ(f.climate.target_temperature, 24);
-}
-
-TEST(WhirlpoolHitachiHCRA31NEWH, ReceiveRejectsShortFrame) {
-  Fixture f(MODEL_HITACHI_HCRA31NEWH);
-  remote_base::RawTimings raw = waveform(hitachi_cool_frame());
-  // Cut after the second divider: 14 bytes, no footer
-  raw.resize(2 + 14 * 16 + 2 * 2);
-  remote_base::RemoteReceiveData data(raw, 25, remote_base::TOLERANCE_MODE_PERCENTAGE);
-  EXPECT_FALSE(static_cast<remote_base::RemoteReceiverListener &>(f.climate).on_receive(data));
-  EXPECT_EQ(f.climate.mode, climate::CLIMATE_MODE_OFF);
-}
-
 }  // namespace esphome::whirlpool::testing

tests/integration/fixtures/external_components/reboot_hook_recorder/__init__.py

@@ -1,23 +0,0 @@
-import esphome.codegen as cg
-import esphome.config_validation as cv
-from esphome.const import CONF_ID, CONF_NAME
-from esphome.types import ConfigType
-
-CODEOWNERS = ["@esphome/tests"]
-MULTI_CONF = True
-
-reboot_hook_recorder_ns = cg.esphome_ns.namespace("reboot_hook_recorder")
-RebootHookRecorder = reboot_hook_recorder_ns.class_("RebootHookRecorder", cg.Component)
-
-CONFIG_SCHEMA = cv.Schema(
-    {
-        cv.GenerateID(): cv.declare_id(RebootHookRecorder),
-        cv.Required(CONF_NAME): cv.string,
-    }
-).extend(cv.COMPONENT_SCHEMA)
-
-
-async def to_code(config: ConfigType) -> None:
-    var = cg.new_Pvariable(config[CONF_ID])
-    await cg.register_component(var, config)
-    cg.add(var.set_name(config[CONF_NAME]))

tests/integration/fixtures/external_components/reboot_hook_recorder/reboot_hook_recorder.cpp

@@ -1,10 +0,0 @@
-#include "reboot_hook_recorder.h"
-#include "esphome/core/log.h"
-
-namespace esphome::reboot_hook_recorder {
-
-ESPHOME_LOG_TAG(TAG, "reboot_hook_recorder");
-
-void RebootHookRecorder::record_(const char *hook) { ESP_LOGI(TAG, "HOOK %s %s", this->name_, hook); }
-
-}  // namespace esphome::reboot_hook_recorder

tests/integration/fixtures/external_components/reboot_hook_recorder/reboot_hook_recorder.h

@@ -1,33 +0,0 @@
-#pragma once
-
-#include "esphome/core/component.h"
-
-namespace esphome::reboot_hook_recorder {
-
-/// Logs every shutdown lifecycle hook it receives, so a test can check their order.
-class RebootHookRecorder : public Component {
- public:
-  void set_name(const char *name) { this->name_ = name; }
-
-  void on_safe_shutdown() override { this->record_("on_safe_shutdown"); }
-  void on_shutdown() override { this->record_("on_shutdown"); }
-  // Needs a second call to finish, like a component waiting for a connection to close
-  bool teardown() override {
-    if (++this->teardown_calls_ < 2) {
-      this->record_("teardown_pending");
-      return false;
-    }
-    if (this->teardown_calls_ == 2)
-      this->record_("teardown_done");
-    return true;
-  }
-  void on_powerdown() override { this->record_("on_powerdown"); }
-
- protected:
-  void record_(const char *hook);
-
-  const char *name_{""};
-  uint8_t teardown_calls_{0};
-};
-
-}  // namespace esphome::reboot_hook_recorder

tests/integration/fixtures/reboot_hook_order_forced.yaml

@@ -1,19 +0,0 @@
-esphome:
-  name: reboot-hooks-forced
-host:
-logger:
-  level: DEBUG
-api:
-  # Reboot once the test has connected, so that it sees every hook
-  on_client_connected:
-    - delay: 100ms
-    - lambda: App.reboot();
-
-external_components:
-  - source:
-      type: local
-      path: EXTERNAL_COMPONENT_PATH
-
-reboot_hook_recorder:
-  - name: first
-  - name: second

tests/integration/fixtures/reboot_hook_order_safe.yaml

@@ -1,19 +0,0 @@
-esphome:
-  name: reboot-hooks-safe
-host:
-logger:
-  level: DEBUG
-api:
-  # Reboot once the test has connected, so that it sees every hook
-  on_client_connected:
-    - delay: 100ms
-    - lambda: App.safe_reboot();
-
-external_components:
-  - source:
-      type: local
-      path: EXTERNAL_COMPONENT_PATH
-
-reboot_hook_recorder:
-  - name: first
-  - name: second

tests/integration/test_reboot_hook_order.py

@@ -1,80 +0,0 @@
-"""Test the order of the shutdown lifecycle hooks on a forced and on a safe reboot."""
-
-import re
-
-import pytest
-
-from .log_utils import LineWaiter
-from .types import APIClientConnectedFactory, RunCompiledFunction
-from .wait_utils import wait_or_fail
-
-HOOK_PATTERN = re.compile(r"HOOK (\w+) (\w+)")
-# Hooks run in reverse component order, so "first" gets each hook last.
-LAST_HOOK = "HOOK first on_powerdown"
-
-
-async def _record_reboot_hooks(
-    yaml_config: str,
-    run_compiled: RunCompiledFunction,
-    api_client_connected: APIClientConnectedFactory,
-) -> list[tuple[str, str]]:
-    """Connect, which makes the device reboot, and return its (component, hook) calls in order."""
-    waiter = LineWaiter()
-    hooks: list[tuple[str, str]] = []
-
-    def on_line(line: str) -> None:
-        if match := HOOK_PATTERN.search(line):
-            hooks.append((match[1], match[2]))
-        waiter.callback(line)
-
-    async with (
-        run_compiled(yaml_config, line_callback=on_line),
-        api_client_connected(),
-    ):
-        await wait_or_fail(
-            waiter.wait_for(LAST_HOOK),
-            5.0,
-            "Device did not run the powerdown hooks",
-            hooks=hooks,
-        )
-    return hooks
-
-
-@pytest.mark.asyncio
-async def test_reboot_hook_order_forced(
-    yaml_config: str,
-    run_compiled: RunCompiledFunction,
-    api_client_connected: APIClientConnectedFactory,
-) -> None:
-    """A forced reboot runs on_shutdown then on_powerdown, with no safe shutdown or teardown."""
-    hooks = await _record_reboot_hooks(yaml_config, run_compiled, api_client_connected)
-
-    assert hooks == [
-        ("second", "on_shutdown"),
-        ("first", "on_shutdown"),
-        ("second", "on_powerdown"),
-        ("first", "on_powerdown"),
-    ]
-
-
-@pytest.mark.asyncio
-async def test_reboot_hook_order_safe(
-    yaml_config: str,
-    run_compiled: RunCompiledFunction,
-    api_client_connected: APIClientConnectedFactory,
-) -> None:
-    """A safe reboot powers down only after every component has finished its teardown."""
-    hooks = await _record_reboot_hooks(yaml_config, run_compiled, api_client_connected)
-
-    assert hooks == [
-        ("second", "on_safe_shutdown"),
-        ("first", "on_safe_shutdown"),
-        ("second", "on_shutdown"),
-        ("first", "on_shutdown"),
-        ("second", "teardown_pending"),
-        ("first", "teardown_pending"),
-        ("second", "teardown_done"),
-        ("first", "teardown_done"),
-        ("second", "on_powerdown"),
-        ("first", "on_powerdown"),
-    ]

tests/unit_tests/core/test_config.py

@@ -707,63 +707,6 @@ def test_to_code_priority_above_safe_mode() -> None:
     )
 
 
-@pytest.mark.asyncio
-async def test_add_looping_components_handles_empty_entries() -> None:
-    """Test that _add_looping_components emits a valid constexpr when there are
-    no looping component entries.
-
-    With zero entries the generated constexpr must still be syntactically valid
-    C++ (`= 0;`), not an empty expression (`= ;`). This guards the empty-list
-    case that would otherwise produce uncompilable main.cpp output.
-    """
-    CORE.data["looping_component_entries"] = []
-
-    await config._add_looping_components()
-
-    constexpr_lines = [
-        str(s)
-        for s in CORE.global_statements
-        if "constexpr size_t ESPHOME_LOOPING_COMPONENT_COUNT" in str(s)
-    ]
-    assert len(constexpr_lines) == 1
-    text = constexpr_lines[0]
-    assert "static constexpr size_t ESPHOME_LOOPING_COMPONENT_COUNT" in text
-    # The right-hand side must contain a literal `0`, not be empty.
-    rhs = text.split("=", 1)[1]
-    assert "0" in rhs
-    assert rhs.strip().rstrip(";").strip(), (
-        f"constexpr right-hand side must not be empty, got: {text!r}"
-    )
-    assert any(
-        "static Component *looping_components_storage[std::max<size_t>(ESPHOME_LOOPING_COMPONENT_COUNT, 1)];"
-        in str(s)
-        for s in CORE.global_statements
-    )
-
-
-@pytest.mark.asyncio
-async def test_add_looping_components_with_entries() -> None:
-    """Test that _add_looping_components builds a HasLoopOverride sum from entries."""
-    CORE.data["looping_component_entries"] = [
-        "esphome::wifi::WiFiComponent",
-        "esphome::logger::Logger",
-        "esphome::wifi::WiFiComponent",
-    ]
-
-    await config._add_looping_components()
-
-    constexpr_lines = [
-        str(s)
-        for s in CORE.global_statements
-        if "constexpr size_t ESPHOME_LOOPING_COMPONENT_COUNT" in str(s)
-    ]
-    assert len(constexpr_lines) == 1
-    text = constexpr_lines[0]
-    # Deduplicated by type, with per-type counts as multiplier.
-    assert "(2 * HasLoopOverride<esphome::wifi::WiFiComponent>::value)" in text
-    assert "(1 * HasLoopOverride<esphome::logger::Logger>::value)" in text
-
-
 @pytest.mark.asyncio
 async def test_add_controller_registry_dispatch_without_controllers() -> None:
     """Nothing is emitted when no controller registered."""

tests/unit_tests/test_cpp_helpers.py

@@ -12,6 +12,7 @@ import pytest
 
 from esphome import codegen as cg, const, cpp_helpers as ch, cpp_types as ct
 from esphome.core import CoroPriority, coroutine_with_priority
+from esphome.coroutine import FakeAwaitable
 from esphome.cpp_generator import MockObj
 from esphome.cpp_helpers import ComponentSourcePool, register_component_source
 
@@ -253,6 +254,111 @@ def test_slot_counter_request_after_emit_raises() -> None:
         request()
 
 
+def _component_var(id_: str, cpp_type: str = "foo::Bar") -> Mock:
+    base = Mock()
+    base.__str__ = lambda self: id_
+    base.type = Mock()
+    base.type.__str__ = lambda self: cpp_type
+    return Mock(base=base)
+
+
+def _looping_count_statement() -> str:
+    lines = [
+        str(s)
+        for s in ch.CORE.global_statements
+        if "constexpr size_t ESPHOME_LOOPING_COMPONENT_COUNT" in str(s)
+    ]
+    assert len(lines) == 1
+    return lines[0]
+
+
+@pytest.fixture
+def stub_component_codegen(monkeypatch: pytest.MonkeyPatch) -> None:
+    """Keep the real CORE (jobs, defines) but skip emitting C++ statements."""
+    monkeypatch.setattr(ch, "add", Mock())
+    monkeypatch.setattr(ch, "App", Mock())
+
+
+@pytest.mark.usefixtures("stub_component_codegen")
+@pytest.mark.parametrize(
+    ("declared", "registered", "expected"),
+    [
+        ({"comp_a", "comp_b", "declared_only"}, ["comp_a", "comp_b"], "2"),
+        ({"declared_only"}, [], "0"),
+    ],
+)
+def test_component_count_skips_unregistered_ids(
+    declared: set[str], registered: list[str], expected: str
+) -> None:
+    """An id declared with a Component type but never registered takes no slot."""
+    ch.CORE.component_ids.update(declared)
+
+    async def registrar() -> None:
+        for id_ in registered:
+            await ch.register_component(_component_var(id_), {})
+
+    ch.CORE.add_job(ch.add_component_counts)
+    ch.CORE.add_job(registrar)
+    ch.CORE.flush_tasks()
+    assert _define_value("ESPHOME_COMPONENT_COUNT") == expected
+
+
+@pytest.mark.usefixtures("stub_component_codegen")
+def test_looping_component_count_without_components_is_zero() -> None:
+    """With no components the constexpr is still valid C++ (`= 0;`, not `= ;`)."""
+    ch.CORE.add_job(ch.add_component_counts)
+    ch.CORE.flush_tasks()
+    rhs = _looping_count_statement().split("=", 1)[1]
+    assert rhs.replace("\\\n", "").strip() == "0;"
+    # The storage is sized at least 1 so a zero count is not a zero-length array
+    assert any(
+        "static Component *looping_components_storage[std::max<size_t>(ESPHOME_LOOPING_COMPONENT_COUNT, 1)];"
+        in str(s)
+        for s in ch.CORE.global_statements
+    )
+
+
+@pytest.mark.usefixtures("stub_component_codegen")
+def test_component_counts_include_final_and_waiting_registrations() -> None:
+    """Registrations from FINAL jobs, and from tasks that waited long enough
+    to sink below FINAL, land in both counts before they are emitted."""
+    ch.CORE.component_ids.update({"final_comp", "slow_comp", "slow_comp_2"})
+
+    @coroutine_with_priority(CoroPriority.FINAL)
+    async def final_registrar() -> None:
+        await ch.register_component(_component_var("final_comp", "foo::Final"), {})
+
+    async def slow_registrar() -> None:
+        # Each yield lowers the task's priority by one, 1500 puts it below FINAL.
+        for _ in range(1500):
+            await FakeAwaitable(iter([None]))
+        await ch.register_component(_component_var("slow_comp", "foo::Slow"), {})
+        await ch.register_component(_component_var("slow_comp_2", "foo::Slow"), {})
+
+    ch.CORE.add_job(ch.add_component_counts)
+    ch.CORE.add_job(final_registrar)
+    ch.CORE.add_job(slow_registrar)
+    ch.CORE.flush_tasks()
+    assert _define_value("ESPHOME_COMPONENT_COUNT") == "3"
+    # Summed per type, so each type is checked once at compile time.
+    looping = _looping_count_statement()
+    assert "(1 * HasLoopOverride<foo::Final>::value)" in looping
+    assert "(2 * HasLoopOverride<foo::Slow>::value)" in looping
+
+
+@pytest.mark.asyncio
+@pytest.mark.usefixtures("stub_component_codegen")
+async def test_component_count_register_after_emit_raises() -> None:
+    """A registration after the counts were emitted would be dropped from
+    App.components_ at run time, so it fails loudly and leaves the id alone."""
+    ch.CORE.component_ids.add("too_late")
+    ch.CORE.add_job(ch.add_component_counts)
+    ch.CORE.flush_tasks()
+    with pytest.raises(ValueError, match="after ESPHOME_COMPONENT_COUNT"):
+        await ch.register_component(_component_var("too_late"), {})
+    assert "too_late" in ch.CORE.component_ids
+
+
 def _load_module(
     monkeypatch: pytest.MonkeyPatch, name: str, path: Path, source: str
 ) -> ModuleType: