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order device values for packing, reducing stack

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proddy
2026-05-19 17:44:39 +02:00
parent 4bb24da89d
commit 9bd987abb0
2 changed files with 29 additions and 23 deletions
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32
src/core/emsdevicevalue.h
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@@ -167,23 +167,27 @@ class DeviceValue {
DV_NUMOP_MUL50 = -50
};
uint8_t device_type; // EMSdevice::DeviceType
int8_t tag; // DeviceValueTAG::*
// Layout chosen for compact packing AND cache locality on 32-bit ESP32.
// pointers — 5 × 4 bytes, all naturally aligned
void * value_p; // pointer to variable of any type
uint8_t type; // DeviceValueType::*
const char * const short_name; // used in MQTT and API
const char * const * fullname; // used in Web and Console, is translated
const char * const ** options; // options as a flash char array
const char * const * options_single; // options are not translated
int8_t numeric_operator;
const char * const short_name; // used in MQTT and API
const char * const * fullname; // used in Web and Console, is translated
std::string custom_fullname; // optional, from customization
uint8_t uom; // DeviceValueUOM::*
bool has_cmd; // true if there is a Console/MQTT command which matches the short_name
int16_t min; // min range
uint32_t max; // max range
uint8_t state; // DeviceValueState::*
uint8_t options_size; // number of options in the char array, calculated at class initialization
// single-byte fields packed together — hot fields, share cache line 0 with the pointers above
uint8_t device_type; // EMSdevice::DeviceType
int8_t tag; // DeviceValueTAG::*
uint8_t type; // DeviceValueType::*
uint8_t state; // DeviceValueState::*
int8_t numeric_operator; // DeviceValueNumOp::*
uint8_t uom; // DeviceValueUOM::*
bool has_cmd; // true if there is a Console/MQTT command which matches the short_name
uint8_t options_size; // number of options in the char array, calculated at class initialization
// wider numeric range fields
int16_t min; // min range
uint32_t max; // max range
// largest member last (cold path: only read during customization save/load and web display)
std::string custom_fullname; // optional, from customization
DeviceValue(uint8_t device_type, // EMSdevice::DeviceType
int8_t tag, // DeviceValueTAG::*