cleanup

esphome/components/json/json_util.cpp

@@ -8,32 +8,6 @@ namespace json {
 
 static const char *const TAG = "json";
 
-#ifdef USE_PSRAM
-// Build an allocator for the JSON Library using the RAMAllocator class
-// This is only compiled when PSRAM is enabled
-struct SpiRamAllocator : ArduinoJson::Allocator {
-  void *allocate(size_t size) override { return this->allocator_.allocate(size); }
-
-  void deallocate(void *pointer) override {
-    // ArduinoJson's Allocator interface doesn't provide the size parameter in deallocate.
-    // RAMAllocator::deallocate() requires the size, which we don't have access to here.
-    // RAMAllocator::deallocate implementation just calls free() regardless of whether
-    // the memory was allocated with heap_caps_malloc or malloc.
-    // This is safe because ESP-IDF's heap implementation internally tracks the memory region
-    // and routes free() to the appropriate heap.
-    free(pointer);  // NOLINT(cppcoreguidelines-owning-memory,cppcoreguidelines-no-malloc)
-  }
-
-  void *reallocate(void *ptr, size_t new_size) override {
-    return this->allocator_.reallocate(static_cast<uint8_t *>(ptr), new_size);
-  }
-
- protected:
-  RAMAllocator<uint8_t> allocator_{RAMAllocator<uint8_t>(RAMAllocator<uint8_t>::NONE)};
-};
-
-#endif
-
 std::string build_json(const json_build_t &f) {
   // NOLINTBEGIN(clang-analyzer-cplusplus.NewDeleteLeaks) false positive with ArduinoJson
   JsonBuilder builder;
@@ -71,24 +45,14 @@ bool parse_json(const std::string &data, const json_parse_t &f) {
 }
 
 // JsonBuilder implementation
-JsonBuilder::JsonBuilder() {
+JsonBuilder::JsonBuilder()
+    : doc_(
 #ifdef USE_PSRAM
-  // Verify our storage is large enough (and log the actual size for reference)
-  static_assert(sizeof(SpiRamAllocator) <= sizeof(allocator_storage_), "allocator_storage_ too small");
-  // Note: sizeof(SpiRamAllocator) is typically around 24-32 bytes on ESP32
-  // Use placement new to construct SpiRamAllocator in the pre-allocated storage
-  auto *allocator = new (allocator_storage_) SpiRamAllocator();
-  doc_ = JsonDocument(allocator);
+          &allocator_
 #else
-  doc_ = JsonDocument();
-#endif
-}
-
-JsonBuilder::~JsonBuilder() {
-#ifdef USE_PSRAM
-  // Explicitly call destructor for placement-new allocated object
-  reinterpret_cast<SpiRamAllocator *>(allocator_storage_)->~SpiRamAllocator();
+          nullptr
 #endif
+      ) {
 }
 
 std::string JsonBuilder::serialize() {

esphome/components/json/json_util.h

@@ -13,6 +13,24 @@
 namespace esphome {
 namespace json {
 
+#ifdef USE_PSRAM
+// Allocator for JSON that uses PSRAM on supported devices
+struct SpiRamAllocator : ArduinoJson::Allocator {
+  void *allocate(size_t size) override { return allocator_.allocate(size); }
+
+  void deallocate(void *ptr) override {
+    free(ptr);  // NOLINT(cppcoreguidelines-owning-memory,cppcoreguidelines-no-malloc)
+  }
+
+  void *reallocate(void *ptr, size_t new_size) override {
+    return allocator_.reallocate(static_cast<uint8_t *>(ptr), new_size);
+  }
+
+ protected:
+  RAMAllocator<uint8_t> allocator_{RAMAllocator<uint8_t>::NONE};
+};
+#endif
+
 /// Callback function typedef for parsing JsonObjects.
 using json_parse_t = std::function<bool(JsonObject)>;
 
@@ -29,7 +47,6 @@ bool parse_json(const std::string &data, const json_parse_t &f);
 class JsonBuilder {
  public:
   JsonBuilder();
-  ~JsonBuilder();
 
   JsonObject root() {
     if (!root_created_) {
@@ -43,9 +60,7 @@ class JsonBuilder {
 
  private:
 #ifdef USE_PSRAM
-  // Storage for SpiRamAllocator - typically around 24-32 bytes on ESP32
-  // Static assert in .cpp file ensures this is large enough
-  std::aligned_storage<32, alignof(void *)>::type allocator_storage_;
+  SpiRamAllocator allocator_;  // Just a regular member on the stack!
 #endif
   JsonDocument doc_;
   JsonObject root_;