[benchmarks] Add host platform benchmarks for text_sensor and button (#15407)

tests/benchmarks/components/button/__init__.py

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+from tests.testing_helpers import ComponentManifestOverride
+
+
+def override_manifest(manifest: ComponentManifestOverride) -> None:
+    manifest.enable_codegen()

tests/benchmarks/components/button/bench_button.cpp

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+#include <benchmark/benchmark.h>
+
+#include "esphome/components/button/button.h"
+
+namespace esphome::button::benchmarks {
+
+static constexpr int kInnerIterations = 2000;
+
+// Minimal Button for benchmarking — press_action() is a no-op.
+class BenchButton : public Button {
+ public:
+  void configure(const char *name) { this->configure_entity_(name, 0x12345678, 0); }
+
+ protected:
+  void press_action() override {}
+};
+
+// --- Button::press() ---
+// Measures: ESP_LOGD + press_action() + callback dispatch.
+
+static void ButtonPress(benchmark::State &state) {
+  BenchButton button;
+  button.configure("test_button");
+
+  for (auto _ : state) {
+    for (int i = 0; i < kInnerIterations; i++) {
+      button.press();
+    }
+    benchmark::DoNotOptimize(&button);
+  }
+  state.SetItemsProcessed(state.iterations() * kInnerIterations);
+}
+BENCHMARK(ButtonPress);
+
+// --- Button::press() with callback ---
+// Measures callback dispatch overhead.
+
+static void ButtonPress_WithCallback(benchmark::State &state) {
+  BenchButton button;
+  button.configure("test_button");
+
+  uint64_t callback_count = 0;
+  button.add_on_press_callback([&callback_count]() { callback_count++; });
+
+  for (auto _ : state) {
+    for (int i = 0; i < kInnerIterations; i++) {
+      button.press();
+    }
+    benchmark::DoNotOptimize(callback_count);
+  }
+  state.SetItemsProcessed(state.iterations() * kInnerIterations);
+}
+BENCHMARK(ButtonPress_WithCallback);
+
+}  // namespace esphome::button::benchmarks

tests/benchmarks/components/button/benchmark.yaml

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+button:

tests/benchmarks/components/text_sensor/__init__.py

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+from tests.testing_helpers import ComponentManifestOverride
+
+
+def override_manifest(manifest: ComponentManifestOverride) -> None:
+    manifest.enable_codegen()

tests/benchmarks/components/text_sensor/bench_text_sensor.cpp

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+#include <benchmark/benchmark.h>
+
+#include "esphome/components/text_sensor/text_sensor.h"
+
+namespace esphome::text_sensor::benchmarks {
+
+static constexpr int kInnerIterations = 2000;
+
+// --- publish_state(const char *) with short string, value changes each time ---
+// Exercises: memcmp check (mismatch), string assign, callback dispatch.
+
+static void TextSensorPublish_Short_Changing(benchmark::State &state) {
+  TextSensor sensor;
+
+  // Pre-populate with different short strings
+  const char *values[] = {"192.168.1.1", "192.168.1.2", "192.168.1.3", "192.168.1.4"};
+
+  for (auto _ : state) {
+    for (int i = 0; i < kInnerIterations; i++) {
+      sensor.publish_state(values[i % 4]);
+    }
+    benchmark::DoNotOptimize(sensor.state);
+  }
+  state.SetItemsProcessed(state.iterations() * kInnerIterations);
+}
+BENCHMARK(TextSensorPublish_Short_Changing);
+
+// --- publish_state(const char *) with short string, same value (dedup path) ---
+// Exercises: memcmp check (match), skips string assign.
+
+static void TextSensorPublish_Short_NoChange(benchmark::State &state) {
+  TextSensor sensor;
+  sensor.publish_state("192.168.1.100");
+
+  for (auto _ : state) {
+    for (int i = 0; i < kInnerIterations; i++) {
+      sensor.publish_state("192.168.1.100");
+    }
+    benchmark::DoNotOptimize(sensor.state);
+  }
+  state.SetItemsProcessed(state.iterations() * kInnerIterations);
+}
+BENCHMARK(TextSensorPublish_Short_NoChange);
+
+// --- publish_state with longer string (firmware version, MAC address) ---
+// Exercises: memcmp on longer strings, string assign with potential realloc.
+
+static void TextSensorPublish_Long_Changing(benchmark::State &state) {
+  TextSensor sensor;
+
+  const char *values[] = {
+      "2025.12.0-dev (Jan 15 2025, 10:30:00)",
+      "2025.12.1-dev (Feb 20 2025, 14:45:00)",
+      "2025.12.2-dev (Mar 10 2025, 08:15:00)",
+      "2025.12.3-dev (Apr  5 2025, 16:00:00)",
+  };
+
+  for (auto _ : state) {
+    for (int i = 0; i < kInnerIterations; i++) {
+      sensor.publish_state(values[i % 4]);
+    }
+    benchmark::DoNotOptimize(sensor.state);
+  }
+  state.SetItemsProcessed(state.iterations() * kInnerIterations);
+}
+BENCHMARK(TextSensorPublish_Long_Changing);
+
+// --- publish_state with callback ---
+// Measures callback dispatch overhead for text sensors.
+
+static void TextSensorPublish_WithCallback(benchmark::State &state) {
+  TextSensor sensor;
+
+  uint64_t callback_count = 0;
+  sensor.add_on_state_callback([&callback_count](const std::string &) { callback_count++; });
+
+  const char *values[] = {"192.168.1.1", "192.168.1.2", "192.168.1.3", "192.168.1.4"};
+
+  for (auto _ : state) {
+    for (int i = 0; i < kInnerIterations; i++) {
+      sensor.publish_state(values[i % 4]);
+    }
+    benchmark::DoNotOptimize(callback_count);
+  }
+  state.SetItemsProcessed(state.iterations() * kInnerIterations);
+}
+BENCHMARK(TextSensorPublish_WithCallback);
+
+// --- publish_state(const char *, size_t) direct ---
+// The lowest-level overload, avoids strlen.
+
+static void TextSensorPublish_WithLen(benchmark::State &state) {
+  TextSensor sensor;
+
+  static constexpr const char *values[] = {"192.168.1.1", "192.168.1.2", "192.168.1.3", "192.168.1.4"};
+  static constexpr size_t lens[] = {11, 11, 11, 11};
+
+  for (auto _ : state) {
+    for (int i = 0; i < kInnerIterations; i++) {
+      sensor.publish_state(values[i % 4], lens[i % 4]);
+    }
+    benchmark::DoNotOptimize(sensor.state);
+  }
+  state.SetItemsProcessed(state.iterations() * kInnerIterations);
+}
+BENCHMARK(TextSensorPublish_WithLen);
+
+}  // namespace esphome::text_sensor::benchmarks

tests/benchmarks/components/text_sensor/benchmark.yaml

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+text_sensor: