static comp, areas, devices

esphome/core/application.h

@@ -214,14 +214,6 @@ class Application {
 #endif
 
   /// Reserve space for components to avoid memory fragmentation
-  void reserve_components(size_t count) { this->components_.reserve(count); }
-
-#ifdef USE_AREAS
-  void reserve_area(size_t count) { this->areas_.reserve(count); }
-#endif
-#ifdef USE_DEVICES
-  void reserve_device(size_t count) { this->devices_.reserve(count); }
-#endif
 
   /// Register the component in this Application instance.
   template<class C> C *register_component(C *c) {
@@ -316,7 +308,7 @@ class Application {
     } \
     return nullptr; \
   }
-  const std::vector<Device *> &get_devices() { return this->devices_; }
+  const auto &get_devices() { return this->devices_; }
 #else
 #define GET_ENTITY_METHOD(entity_type, entity_name, entities_member) \
   entity_type *get_##entity_name##_by_key(uint32_t key, bool include_internal = false) { \
@@ -328,7 +320,7 @@ class Application {
   }
 #endif  // USE_DEVICES
 #ifdef USE_AREAS
-  const std::vector<Area *> &get_areas() { return this->areas_; }
+  const auto &get_areas() { return this->areas_; }
 #endif
 #ifdef USE_BINARY_SENSOR
   auto &get_binary_sensors() const { return this->binary_sensors_; }
@@ -466,7 +458,7 @@ class Application {
   size_t dump_config_at_{SIZE_MAX};
 
   // Vectors (largest members)
-  std::vector<Component *> components_{};
+  StaticVector<Component *, ESPHOME_COMPONENT_COUNT> components_{};
 
   // Partitioned vector design for looping components
   // =================================================
@@ -487,10 +479,10 @@ class Application {
   std::vector<Component *> looping_components_{};
 
 #ifdef USE_DEVICES
-  std::vector<Device *> devices_{};
+  StaticVector<Device *, ESPHOME_DEVICE_COUNT> devices_{};
 #endif
 #ifdef USE_AREAS
-  std::vector<Area *> areas_{};
+  StaticVector<Area *, ESPHOME_AREA_COUNT> areas_{};
 #endif
 #ifdef USE_BINARY_SENSOR
   StaticVector<binary_sensor::BinarySensor *, ESPHOME_ENTITY_BINARY_SENSOR_COUNT> binary_sensors_{};

esphome/core/config.py

@@ -444,10 +444,8 @@ async def to_code(config: ConfigType) -> None:
             config[CONF_NAME_ADD_MAC_SUFFIX],
         )
     )
-    # Reserve space for components to avoid reallocation during registration
-    cg.add(
-        cg.RawStatement(f"App.reserve_components({len(CORE.component_ids)});"),
-    )
+    # Define component count for static allocation
+    cg.add_define("ESPHOME_COMPONENT_COUNT", len(CORE.component_ids))
 
     CORE.add_job(_add_platform_reserves)
 
@@ -516,8 +514,8 @@ async def to_code(config: ConfigType) -> None:
     all_areas.extend(config[CONF_AREAS])
 
     if all_areas:
-        cg.add(cg.RawStatement(f"App.reserve_area({len(all_areas)});"))
         cg.add_define("USE_AREAS")
+        cg.add_define("ESPHOME_AREA_COUNT", len(all_areas))
 
         for area_conf in all_areas:
             area_id: core.ID = area_conf[CONF_ID]
@@ -534,9 +532,9 @@ async def to_code(config: ConfigType) -> None:
     if not devices:
         return
 
-    # Reserve space for devices
-    cg.add(cg.RawStatement(f"App.reserve_device({len(devices)});"))
+    # Define device count for static allocation
     cg.add_define("USE_DEVICES")
+    cg.add_define("ESPHOME_DEVICE_COUNT", len(devices))
 
     # Process each device
     for dev_conf in devices:

esphome/core/defines.h

@@ -240,7 +240,10 @@
 
 #define USE_DASHBOARD_IMPORT
 
-// Default entity counts for static analysis
+// Default counts for static analysis
+#define ESPHOME_COMPONENT_COUNT 50
+#define ESPHOME_DEVICE_COUNT 10
+#define ESPHOME_AREA_COUNT 10
 #define ESPHOME_ENTITY_ALARM_CONTROL_PANEL_COUNT 1
 #define ESPHOME_ENTITY_BINARY_SENSOR_COUNT 1
 #define ESPHOME_ENTITY_BUTTON_COUNT 1

esphome/core/helpers.h

@@ -5,6 +5,7 @@
 #include <cstdint>
 #include <cstring>
 #include <functional>
+#include <iterator>
 #include <limits>
 #include <memory>
 #include <string>
@@ -100,6 +101,8 @@ template<typename T, size_t N> class StaticVector {
   using value_type = T;
   using iterator = typename std::array<T, N>::iterator;
   using const_iterator = typename std::array<T, N>::const_iterator;
+  using reverse_iterator = std::reverse_iterator<iterator>;
+  using const_reverse_iterator = std::reverse_iterator<const_iterator>;
 
  private:
   std::array<T, N> data_{};
@@ -114,6 +117,7 @@ template<typename T, size_t N> class StaticVector {
   }
 
   size_t size() const { return count_; }
+  bool empty() const { return count_ == 0; }
 
   T &operator[](size_t i) { return data_[i]; }
   const T &operator[](size_t i) const { return data_[i]; }
@@ -123,6 +127,12 @@ template<typename T, size_t N> class StaticVector {
   iterator end() { return data_.begin() + count_; }
   const_iterator begin() const { return data_.begin(); }
   const_iterator end() const { return data_.begin() + count_; }
+
+  // Reverse iterators
+  reverse_iterator rbegin() { return reverse_iterator(end()); }
+  reverse_iterator rend() { return reverse_iterator(begin()); }
+  const_reverse_iterator rbegin() const { return const_reverse_iterator(end()); }
+  const_reverse_iterator rend() const { return const_reverse_iterator(begin()); }
 };
 
 ///@}