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Merge branch 'esp32_ble_no_vector_no_heap_small' into integration

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This commit is contained in:
J. Nick Koston
2025-08-15 00:59:00 -05:00
parent 0757a18fe7 0d966ac115
commit d632fc930c
1 changed files with 101 additions and 62 deletions
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153
esphome/components/esp32_ble/ble_event.h
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@@ -61,10 +61,14 @@ static_assert(offsetof(esp_ble_gap_cb_param_t, read_rssi_cmpl.rssi) == sizeof(es
static_assert(offsetof(esp_ble_gap_cb_param_t, read_rssi_cmpl.remote_addr) == sizeof(esp_bt_status_t) + sizeof(int8_t),
"remote_addr must follow rssi in read_rssi_cmpl");
// Maximum size for inline storage of GATTC/GATTS data
// This value is chosen to fit within the 80-byte union while maximizing inline storage
static constexpr size_t INLINE_DATA_SIZE = 68;
// Received GAP, GATTC and GATTS events are only queued, and get processed in the main loop().
// This class stores each event with minimal memory usage.
// GAP events (99% of traffic) don't have the heap allocation overhead.
// GATTC/GATTS events use heap allocation for their param and data.
// GATTC/GATTS events use heap allocation for their param and inline storage for small data.
//
// Event flow:
// 1. ESP-IDF BLE stack calls our static handlers in the BLE task context
@@ -135,27 +139,36 @@ class BLEEvent {
~BLEEvent() { this->release(); }
// Default constructor for pre-allocation in pool
BLEEvent() : type_(GAP) {}
BLEEvent() : event_{}, type_(GAP) {}
// Invoked on return to EventPool - clean up any heap-allocated data
void release() {
if (this->type_ == GAP) {
return;
}
if (this->type_ == GATTC) {
switch (this->type_) {
case GAP:
// GAP events don't have heap allocations
break;
case GATTC:
delete this->event_.gattc.gattc_param;
delete[] this->event_.gattc.data;
this->event_.gattc.gattc_param = nullptr;
this->event_.gattc.data = nullptr;
this->event_.gattc.data_len = 0;
return;
// Only delete heap data if it was heap-allocated
if (!this->event_.gattc.is_inline && this->event_.gattc.data.heap_data != nullptr) {
delete[] this->event_.gattc.data.heap_data;
}
if (this->type_ == GATTS) {
// Clear critical fields to prevent issues if type changes
this->event_.gattc.gattc_param = nullptr;
this->event_.gattc.is_inline = false;
this->event_.gattc.data.heap_data = nullptr;
break;
case GATTS:
delete this->event_.gatts.gatts_param;
delete[] this->event_.gatts.data;
// Only delete heap data if it was heap-allocated
if (!this->event_.gatts.is_inline && this->event_.gatts.data.heap_data != nullptr) {
delete[] this->event_.gatts.data.heap_data;
}
// Clear critical fields to prevent issues if type changes
this->event_.gatts.gatts_param = nullptr;
this->event_.gatts.data = nullptr;
this->event_.gatts.data_len = 0;
this->event_.gatts.is_inline = false;
this->event_.gatts.data.heap_data = nullptr;
break;
}
}
@@ -207,21 +220,29 @@ class BLEEvent {
// NOLINTNEXTLINE(readability-identifier-naming)
struct gattc_event {
esp_gattc_cb_event_t gattc_event;
esp_gatt_if_t gattc_if;
esp_ble_gattc_cb_param_t *gattc_param; // Heap-allocated
uint8_t *data; // Heap-allocated raw buffer (manually managed)
uint16_t data_len; // Track size separately
} gattc;
esp_ble_gattc_cb_param_t *gattc_param; // Heap-allocated (4 bytes)
esp_gattc_cb_event_t gattc_event; // 4 bytes
union {
uint8_t *heap_data; // 4 bytes when heap-allocated
uint8_t inline_data[INLINE_DATA_SIZE]; // INLINE_DATA_SIZE bytes when stored inline
} data; // INLINE_DATA_SIZE bytes total
uint16_t data_len; // 2 bytes
esp_gatt_if_t gattc_if; // 1 byte
bool is_inline; // 1 byte - true when data is stored inline
} gattc; // Total: 80 bytes
// NOLINTNEXTLINE(readability-identifier-naming)
struct gatts_event {
esp_gatts_cb_event_t gatts_event;
esp_gatt_if_t gatts_if;
esp_ble_gatts_cb_param_t *gatts_param; // Heap-allocated
uint8_t *data; // Heap-allocated raw buffer (manually managed)
uint16_t data_len; // Track size separately
} gatts;
esp_ble_gatts_cb_param_t *gatts_param; // Heap-allocated (4 bytes)
esp_gatts_cb_event_t gatts_event; // 4 bytes
union {
uint8_t *heap_data; // 4 bytes when heap-allocated
uint8_t inline_data[INLINE_DATA_SIZE]; // INLINE_DATA_SIZE bytes when stored inline
} data; // INLINE_DATA_SIZE bytes total
uint16_t data_len; // 2 bytes
esp_gatt_if_t gatts_if; // 1 byte
bool is_inline; // 1 byte - true when data is stored inline
} gatts; // Total: 80 bytes
} event_; // 80 bytes
ble_event_t type_;
@@ -236,6 +257,29 @@ class BLEEvent {
const esp_ble_sec_t &security() const { return event_.gap.security; }
private:
// Helper to copy data with inline storage optimization
template<typename EventStruct>
void copy_data_with_inline_storage_(EventStruct &event, const uint8_t *src_data, uint16_t len,
uint8_t **param_value_ptr) {
event.data_len = len;
if (len > 0) {
if (len <= INLINE_DATA_SIZE) {
event.is_inline = true;
memcpy(event.data.inline_data, src_data, len);
*param_value_ptr = event.data.inline_data;
} else {
event.is_inline = false;
event.data.heap_data = new uint8_t[len];
memcpy(event.data.heap_data, src_data, len);
*param_value_ptr = event.data.heap_data;
}
} else {
event.is_inline = false;
event.data.heap_data = nullptr;
*param_value_ptr = nullptr;
}
}
// Initialize GAP event data
void init_gap_data_(esp_gap_ble_cb_event_t e, esp_ble_gap_cb_param_t *p) {
this->event_.gap.gap_event = e;
@@ -321,12 +365,13 @@ class BLEEvent {
if (p == nullptr) {
this->event_.gattc.gattc_param = nullptr;
this->event_.gattc.data = nullptr;
this->event_.gattc.is_inline = false;
this->event_.gattc.data.heap_data = nullptr;
this->event_.gattc.data_len = 0;
return; // Invalid event, but we can't log in header file
}
// Heap-allocate param and data
// Heap-allocate param
// Heap allocation is used because GATTC/GATTS events are rare (<1% of events)
// while GAP events (99%) are stored inline to minimize memory usage
// IMPORTANT: This heap allocation provides clear ownership semantics:
@@ -340,28 +385,17 @@ class BLEEvent {
// We must copy this data to ensure it remains valid when the event is processed later.
switch (e) {
case ESP_GATTC_NOTIFY_EVT:
this->event_.gattc.data_len = p->notify.value_len;
if (p->notify.value_len > 0) {
this->event_.gattc.data = new uint8_t[p->notify.value_len];
memcpy(this->event_.gattc.data, p->notify.value, p->notify.value_len);
} else {
this->event_.gattc.data = nullptr;
}
this->event_.gattc.gattc_param->notify.value = this->event_.gattc.data;
copy_data_with_inline_storage_(this->event_.gattc, p->notify.value, p->notify.value_len,
&this->event_.gattc.gattc_param->notify.value);
break;
case ESP_GATTC_READ_CHAR_EVT:
case ESP_GATTC_READ_DESCR_EVT:
this->event_.gattc.data_len = p->read.value_len;
if (p->read.value_len > 0) {
this->event_.gattc.data = new uint8_t[p->read.value_len];
memcpy(this->event_.gattc.data, p->read.value, p->read.value_len);
} else {
this->event_.gattc.data = nullptr;
}
this->event_.gattc.gattc_param->read.value = this->event_.gattc.data;
copy_data_with_inline_storage_(this->event_.gattc, p->read.value, p->read.value_len,
&this->event_.gattc.gattc_param->read.value);
break;
default:
this->event_.gattc.data = nullptr;
this->event_.gattc.is_inline = false;
this->event_.gattc.data.heap_data = nullptr;
this->event_.gattc.data_len = 0;
break;
}
@@ -374,12 +408,13 @@ class BLEEvent {
if (p == nullptr) {
this->event_.gatts.gatts_param = nullptr;
this->event_.gatts.data = nullptr;
this->event_.gatts.is_inline = false;
this->event_.gatts.data.heap_data = nullptr;
this->event_.gatts.data_len = 0;
return; // Invalid event, but we can't log in header file
}
// Heap-allocate param and data
// Heap-allocate param
// Heap allocation is used because GATTC/GATTS events are rare (<1% of events)
// while GAP events (99%) are stored inline to minimize memory usage
// IMPORTANT: This heap allocation provides clear ownership semantics:
@@ -393,17 +428,12 @@ class BLEEvent {
// We must copy this data to ensure it remains valid when the event is processed later.
switch (e) {
case ESP_GATTS_WRITE_EVT:
this->event_.gatts.data_len = p->write.len;
if (p->write.len > 0) {
this->event_.gatts.data = new uint8_t[p->write.len];
memcpy(this->event_.gatts.data, p->write.value, p->write.len);
} else {
this->event_.gatts.data = nullptr;
}
this->event_.gatts.gatts_param->write.value = this->event_.gatts.data;
copy_data_with_inline_storage_(this->event_.gatts, p->write.value, p->write.len,
&this->event_.gatts.gatts_param->write.value);
break;
default:
this->event_.gatts.data = nullptr;
this->event_.gatts.is_inline = false;
this->event_.gatts.data.heap_data = nullptr;
this->event_.gatts.data_len = 0;
break;
}
@@ -414,6 +444,15 @@ class BLEEvent {
// The gap member in the union should be 80 bytes (including the gap_event enum)
static_assert(sizeof(decltype(((BLEEvent *) nullptr)->event_.gap)) <= 80, "gap_event struct has grown beyond 80 bytes");
// Verify GATTC and GATTS structs don't exceed GAP struct size
// This ensures the union size is determined by GAP (the most common event type)
static_assert(sizeof(decltype(((BLEEvent *) nullptr)->event_.gattc)) <=
sizeof(decltype(((BLEEvent *) nullptr)->event_.gap)),
"gattc_event struct exceeds gap_event size - union size would increase");
static_assert(sizeof(decltype(((BLEEvent *) nullptr)->event_.gatts)) <=
sizeof(decltype(((BLEEvent *) nullptr)->event_.gap)),
"gatts_event struct exceeds gap_event size - union size would increase");
// Verify esp_ble_sec_t fits within our union
static_assert(sizeof(esp_ble_sec_t) <= 73, "esp_ble_sec_t is larger than BLEScanResult");