mirror of
https://github.com/esphome/esphome.git
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David Woodhouse
e728e8ed0c
- Use <cstdint> instead of <stdint.h> - Rename config_hash_struct to ConfigHashStruct for naming consistency
85 lines
2.9 KiB
C++
85 lines
2.9 KiB
C++
#include <cstdint>
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// Build information is passed in via symbols defined in a linker script
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// as that is the simplest way to include build timestamps without the
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// changed timestamp itself causing a rebuild through dependencies, as
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// it would if it were in a header file like version.h.
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//
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// It's passed in in *string* form so that it can go directly into the
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// flash as .rodate instead of using precious RAM to build a date string
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// from a time_t at runtime.
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//
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// Determining the target endianness and word size from the generation
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// side is problematic, so it emits *four* sets of symbols into the
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// linker script, for each of little-endian and big-endiand, 32-bit and
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// 64-bit targets.
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//
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// The LINKERSYM macro gymnastics select the correct symbol for the
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// target, named e.g. 'ESPHOME_BUILD_TIME_STR_32LE_0'.
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// Not all targets have <endian.h> (e.g. LibreTiny on BK72xx).
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// Use the compiler built-in macros but defensively default to
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// little-endian and 32-bit.
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#if !defined(__BYTE_ORDER__) || __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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#define BO LE
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#else
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#define BO BE
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#endif
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#if defined(__SIZEOF_POINTER__) && __SIZEOF_POINTER__ == 8
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#define WS 64 // NOLINT
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#else
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#define WS 32 // NOLINT
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#define USE_32BIT
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#endif
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// If you have to ask, you don't want to know...
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#define LINKERSYM2(name, ws, bo, us, num) ESPHOME_##name##_##ws##bo##us##num
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#define LINKERSYM1(name, ws, bo, us, num) LINKERSYM2(name, ws, bo, us, num)
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#define LINKERSYM(name, num) LINKERSYM1(name, WS, BO, _, num)
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extern "C" {
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extern const char ESPHOME_BUILD_TIME[];
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extern const char LINKERSYM(CONFIG_HASH_STR, 0)[];
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extern const char LINKERSYM(CONFIG_HASH_STR, 1)[];
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extern const char LINKERSYM(BUILD_TIME_STR, 0)[];
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extern const char LINKERSYM(BUILD_TIME_STR, 1)[];
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extern const char LINKERSYM(BUILD_TIME_STR, 2)[];
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extern const char LINKERSYM(BUILD_TIME_STR, 3)[];
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extern const char LINKERSYM(BUILD_TIME_STR, 4)[];
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extern const char LINKERSYM(BUILD_TIME_STR, 5)[];
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}
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namespace esphome {
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namespace buildinfo {
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// An 8-byte string plus terminating NUL.
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struct ConfigHashStruct {
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uintptr_t data0;
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#ifdef USE_32BIT
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uintptr_t data1;
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#endif
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char nul;
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} __attribute__((packed));
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extern const ConfigHashStruct CONFIG_HASH_STR = {(uintptr_t) &LINKERSYM(CONFIG_HASH_STR, 0),
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#ifdef USE_32BIT
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(uintptr_t) &LINKERSYM(CONFIG_HASH_STR, 1),
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#endif
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0};
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// A 21-byte string plus terminating NUL, in 24 bytes
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extern const uintptr_t BUILD_TIME_STR[] = {
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(uintptr_t) &LINKERSYM(BUILD_TIME_STR, 0), (uintptr_t) &LINKERSYM(BUILD_TIME_STR, 1),
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(uintptr_t) &LINKERSYM(BUILD_TIME_STR, 2),
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#ifdef USE_32BIT
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(uintptr_t) &LINKERSYM(BUILD_TIME_STR, 3), (uintptr_t) &LINKERSYM(BUILD_TIME_STR, 4),
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(uintptr_t) &LINKERSYM(BUILD_TIME_STR, 5),
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#endif
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};
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extern const uintptr_t BUILD_TIME = (uintptr_t) &ESPHOME_BUILD_TIME;
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} // namespace buildinfo
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} // namespace esphome
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