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35 lines
1.7 KiB
C
35 lines
1.7 KiB
C
/* dynarray.h
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Macros for generating a "dynamic array", a static array of objects declared in different translation units
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*/
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#pragma once
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// Declare the beginning and ending elements of a dynamic array of 'type'.
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// This must be used in only one translation unit in your program for any given array.
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#define DECLARE_DYNARRAY(type, array_name) \
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static type const DYNARRAY_BEGIN(array_name)[0] __attribute__((__section__(DYNARRAY_SECTION "." #array_name ".0"), unused)) = {}; \
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static type const DYNARRAY_END(array_name)[0] __attribute__((__section__(DYNARRAY_SECTION "." #array_name ".99999"), unused)) = {};
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// Declare an object that is a member of a dynamic array. "member name" must be unique; "array_section" is an integer for ordering items.
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// It is legal to define multiple items with the same section name; the order of those items will be up to the linker.
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#define DYNARRAY_MEMBER(type, array_name, member_name, array_section) type const member_name __attribute__((__section__(DYNARRAY_SECTION "." #array_name "." #array_section), used))
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#define DYNARRAY_BEGIN(array_name) array_name##_begin
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#define DYNARRAY_END(array_name) array_name##_end
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#define DYNARRAY_LENGTH(array_name) (&DYNARRAY_END(array_name)[0] - &DYNARRAY_BEGIN(array_name)[0])
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#ifdef ESP8266
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// ESP8266 linker script cannot be extended with a unique section for dynamic arrays.
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// We instead pack them in the ".dtors" section, as it's sorted and uploaded to the flash
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// (but will never be used in the embedded system)
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#define DYNARRAY_SECTION ".dtors"
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#else /* ESP8266 */
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// Use a unique named section; the linker script must be extended to ensure it's correctly placed.
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#define DYNARRAY_SECTION ".dynarray"
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#endif
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