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feat: log failed heap allocations before the abort

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An allocation that fails inside library code (the web server's
operator new) aborts with only a backtrace.  A failed-allocation
callback now prints the requested size, the caps, the function and
what the heap had left (free, largest block, minimum free), using the
ROM printf as the logger may need the heap itself.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
cjkas 2026-10-22 20:40:25 +02:00
parent 539a49eb77
commit e2bab0d492
1 changed files with 14 additions and 1 deletions
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13
src/SomfyController.cpp
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@ -18,6 +18,9 @@
#include "esp_system.h" #include "esp_system.h"
#include "esp_app_desc.h" #include "esp_app_desc.h"
#include "esp_ota_ops.h" #include "esp_ota_ops.h"
#include "esp_heap_caps.h"
#include "esp_rom_sys.h"
#include <inttypes.h>
#include "Timing.h" #include "Timing.h"
static const char *TAG = "Main"; static const char *TAG = "Main";
@ -70,8 +73,18 @@ void listDir(const char *dirname, uint8_t levels) {
} }
} }
// A failed allocation in library code aborts with only the backtrace, so this
// leaves the size and what the heap had left next to it. Printed by the ROM
// as the logger might need the heap itself.
static void onAllocFailed(size_t size, uint32_t caps, const char *function) {
esp_rom_printf("Alloc of %u bytes (caps 0x%" PRIx32 ") failed in %s: free %u, largest block %u, min free %u\n",
(unsigned)size, caps, function ? function : "?", (unsigned)heap_caps_get_free_size(caps),
(unsigned)heap_caps_get_largest_free_block(caps), (unsigned)heap_caps_get_minimum_free_size(caps));
}
void setup() { void setup() {
Serial.begin(SERIAL_BAUD); Serial.begin(SERIAL_BAUD);
heap_caps_register_failed_alloc_callback(onAllocFailed);
ESP_LOGI(TAG, "Startup/Boot...."); ESP_LOGI(TAG, "Startup/Boot....");
esp_core_dump_summary_t summary; esp_core_dump_summary_t summary;
if (esp_core_dump_get_summary(&summary) == ESP_OK) { if (esp_core_dump_get_summary(&summary) == ESP_OK) {