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Reduce core RAM usage by 40 bytes with static initialization optimizations

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J. Nick Koston 2025-07-05 21:34:03 -05:00
parent b0f8922056
commit a45743c2b7
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2 changed files with 23 additions and 11 deletions
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18
esphome/core/component.cpp
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@ -26,16 +26,22 @@ static const char *const TAG = "component";
// 1. Components are never destroyed in ESPHome // 1. Components are never destroyed in ESPHome
// 2. Failed components remain failed (no recovery mechanism) // 2. Failed components remain failed (no recovery mechanism)
// 3. Memory usage is minimal (only failures with custom messages are stored) // 3. Memory usage is minimal (only failures with custom messages are stored)
// Using namespace-scope static to avoid guard variables (saves 16 bytes total)
// This is safe because ESPHome is single-threaded during initialization
namespace {
// Error messages for failed components
std::unique_ptr<std::vector<std::pair<const Component *, const char *>>> component_error_messages;
// Setup priority overrides - freed after setup completes
std::unique_ptr<std::vector<std::pair<const Component *, float>>> setup_priority_overrides;
} // namespace
static std::unique_ptr<std::vector<std::pair<const Component *, const char *>>> &get_component_error_messages() { static std::unique_ptr<std::vector<std::pair<const Component *, const char *>>> &get_component_error_messages() {
static std::unique_ptr<std::vector<std::pair<const Component *, const char *>>> instance; return component_error_messages;
return instance;
} }
// Setup priority overrides - freed after setup completes
// Typically < 5 entries, lazy allocated
static std::unique_ptr<std::vector<std::pair<const Component *, float>>> &get_setup_priority_overrides() { static std::unique_ptr<std::vector<std::pair<const Component *, float>>> &get_setup_priority_overrides() {
static std::unique_ptr<std::vector<std::pair<const Component *, float>>> instance; return setup_priority_overrides;
return instance;
} }
namespace setup_priority { namespace setup_priority {

16
esphome/core/helpers.cpp
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@ -460,9 +460,15 @@ int8_t step_to_accuracy_decimals(float step) {
return str.length() - dot_pos - 1; return str.length() - dot_pos - 1;
} }
static const std::string BASE64_CHARS = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" // Use C-style string constant to store in ROM instead of RAM (saves 24 bytes)
"abcdefghijklmnopqrstuvwxyz" static constexpr const char *BASE64_CHARS = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"0123456789+/"; "abcdefghijklmnopqrstuvwxyz"
"0123456789+/";
static inline uint8_t base64_find_char(char c) {
const char *pos = strchr(BASE64_CHARS, c);
return pos ? (pos - BASE64_CHARS) : 0;
}
static inline bool is_base64(char c) { return (isalnum(c) || (c == '+') || (c == '/')); } static inline bool is_base64(char c) { return (isalnum(c) || (c == '+') || (c == '/')); }
@ -531,7 +537,7 @@ std::vector<uint8_t> base64_decode(const std::string &encoded_string) {
in++; in++;
if (i == 4) { if (i == 4) {
for (i = 0; i < 4; i++) for (i = 0; i < 4; i++)
char_array_4[i] = BASE64_CHARS.find(char_array_4[i]); char_array_4[i] = base64_find_char(char_array_4[i]);
char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4); char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2); char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
@ -548,7 +554,7 @@ std::vector<uint8_t> base64_decode(const std::string &encoded_string) {
char_array_4[j] = 0; char_array_4[j] = 0;
for (j = 0; j < 4; j++) for (j = 0; j < 4; j++)
char_array_4[j] = BASE64_CHARS.find(char_array_4[j]); char_array_4[j] = base64_find_char(char_array_4[j]);
char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4); char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2); char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);