common/autodata: autodata replacement which uses __attribute__((constructor))
This is a GCC extension, but avoids much other messiness. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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@ -1,6 +1,7 @@
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COMMON_SRC_NOGEN := \
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common/addr.c \
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common/amount.c \
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common/autodata.c \
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common/base32.c \
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common/base64.c \
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common/bech32.c \
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#include "config.h"
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#include <assert.h>
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#include <ccan/strmap/strmap.h>
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#include <common/autodata.h>
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struct typereg {
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size_t num;
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const void **ptrs;
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};
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static STRMAP(struct typereg *) typemap;
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void autodata_register_(const char *typename, const void *ptr)
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{
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struct typereg *t;
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assert(ptr);
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t = strmap_get(&typemap, typename);
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if (!t) {
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t = malloc(sizeof(struct typereg));
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t->num = 0;
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t->ptrs = NULL;
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strmap_add(&typemap, typename, t);
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}
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t->ptrs = realloc(t->ptrs, (t->num + 1) * sizeof(*t->ptrs));
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t->ptrs[t->num] = ptr;
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t->num++;
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}
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void *autodata_get_(const char *typename, size_t *nump)
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{
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struct typereg *t = strmap_get(&typemap, typename);
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if (!t) {
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*nump = 0;
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return NULL;
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}
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*nump = t->num;
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return t->ptrs;
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}
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@ -0,0 +1,26 @@
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#ifndef LIGHTNING_COMMON_AUTODATA_H
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#define LIGHTNING_COMMON_AUTODATA_H
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#include "config.h"
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#include <ccan/compiler/compiler.h>
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#include <ccan/cppmagic/cppmagic.h>
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#define AUTODATA_TYPE(name, type) \
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static inline void register_autotype_##name(const type *t) { \
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autodata_register_(#name, t); \
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} \
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typedef type autodata_##name##_
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/* This uses GCC's constructor attribute */
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#define AUTODATA(name, ptr) \
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static __attribute__((constructor)) NEEDED \
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void CPPMAGIC_GLUE2(register_one_##name,__COUNTER__)(void) { \
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register_autotype_##name(ptr); \
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}
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#define autodata_get(name, nump) \
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((autodata_##name##_ **)autodata_get_(#name, (nump)))
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void autodata_register_(const char *typename, const void *ptr);
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void *autodata_get_(const char *typename, size_t *nump);
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#endif /* LIGHTNING_COMMON_AUTODATA_H */
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