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Add some comments to places where we cast through a void* to get rid of alignment warnings

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This commit is contained in:
Dirk Ziegelmeier
2016-07-07 21:56:43 +02:00
parent 212eacd9d6
commit 087ecab891
3 changed files with 5 additions and 0 deletions
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3
src/core/mem.c
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@@ -145,6 +145,7 @@ mem_free(void *rmem)
LWIP_ASSERT("rmem == MEM_ALIGN(rmem)", (rmem == LWIP_MEM_ALIGN(rmem)));
/* get the original struct memp_malloc_helper */
/* cast through void* to get rid of alignment warnings */
hmem = (struct memp_malloc_helper*)(void*)((u8_t*)rmem - LWIP_MEM_ALIGN_SIZE(sizeof(struct memp_malloc_helper)));
LWIP_ASSERT("hmem != NULL", (hmem != NULL));
@@ -357,6 +358,7 @@ mem_free(void *rmem)
/* protect the heap from concurrent access */
LWIP_MEM_FREE_PROTECT();
/* Get the corresponding struct mem ... */
/* cast through void* to get rid of alignment warnings */
mem = (struct mem *)(void *)((u8_t *)rmem - SIZEOF_STRUCT_MEM);
/* ... which has to be in a used state ... */
LWIP_ASSERT("mem_free: mem->used", mem->used);
@@ -423,6 +425,7 @@ mem_trim(void *rmem, mem_size_t newsize)
return rmem;
}
/* Get the corresponding struct mem ... */
/* cast through void* to get rid of alignment warnings */
mem = (struct mem *)(void *)((u8_t *)rmem - SIZEOF_STRUCT_MEM);
/* ... and its offset pointer */
ptr = (mem_size_t)((u8_t *)mem - ram);

1
src/core/tcp_out.c
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@@ -1174,6 +1174,7 @@ tcp_output_segment(struct tcp_seg *seg, struct tcp_pcb *pcb, struct netif *netif
/* Add any requested options. NB MSS option is only set on SYN
packets, so ignore it here */
/* cast through void* to get rid of alignment warnings */
opts = (u32_t *)(void *)(seg->tcphdr + 1);
if (seg->flags & TF_SEG_OPTS_MSS) {
u16_t mss;