ESP-IDF
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Outline
#include <string.h>
#include <stdlib.h>
#include <sys/reent.h>
#include <errno.h>
#include <malloc.h>
#include "esp_heap_caps.h"
malloc(size_t)
calloc(size_t, size_t)
realloc(void *, size_t)
free(void *)
_malloc_r(struct _reent *, size_t)
_free_r(struct _reent *, void *)
_realloc_r(struct _reent *, void *, size_t)
_calloc_r(struct _reent *, size_t, size_t)
memalign(size_t, size_t)
aligned_alloc(size_t, size_t)
posix_memalign(void **, size_t, size_t)
newlib_include_heap_impl()
malloc_trim(size_t)
malloc_usable_size(void *)
malloc_stats()
mallopt(int, int)
mallinfo()
valloc(size_t)
pvalloc(size_t)
cfree(void *)
Files
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SourceVuESP-IDF Framework and ExamplesESP-IDFcomponents/newlib/heap.c
 
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/* * SPDX-FileCopyrightText: 2015-2024 Espressif Systems (Shanghai) CO LTD * * SPDX-License-Identifier: Apache-2.0 *//* ... */ #include <string.h> #include <stdlib.h> #include <sys/reent.h> #include <errno.h> #include <malloc.h> #include "esp_heap_caps.h"6 includes /* These contain the business logic for the malloc() and realloc() implementation. Because of heap tracing wrapping reasons, we do not want these to be a public api, however, so they're not defined publicly. *//* ... */ extern void *heap_caps_malloc_default(size_t size); extern void *heap_caps_realloc_default(void *ptr, size_t size); extern void *heap_caps_aligned_alloc_default(size_t alignment, size_t size); void* malloc(size_t size) { return heap_caps_malloc_default(size); }{ ... } void* calloc(size_t n, size_t size) { return _calloc_r(_REENT, n, size); }{ ... } void* realloc(void* ptr, size_t size) { return heap_caps_realloc_default(ptr, size); }{ ... } void free(void *ptr) { heap_caps_free(ptr); }{ ... } void* _malloc_r(struct _reent *r, size_t size) { return heap_caps_malloc_default(size); }{ ... } void _free_r(struct _reent *r, void* ptr) { heap_caps_free(ptr); }{ ... } void* _realloc_r(struct _reent *r, void* ptr, size_t size) { return heap_caps_realloc_default(ptr, size); }{ ... } void* _calloc_r(struct _reent *r, size_t nmemb, size_t size) { void *result; size_t size_bytes; if (__builtin_mul_overflow(nmemb, size, &size_bytes)) { return NULL; }{...} result = heap_caps_malloc_default(size_bytes); if (result != NULL) { bzero(result, size_bytes); }{...} return result; }{ ... } void* memalign(size_t alignment, size_t n) { return heap_caps_aligned_alloc_default(alignment, n); }{ ... } void* aligned_alloc(size_t alignment, size_t n) { return heap_caps_aligned_alloc_default(alignment, n); }{ ... } int posix_memalign(void **out_ptr, size_t alignment, size_t size) { if (size == 0) { /* returning NULL for zero size is allowed, don't treat this as an error */ *out_ptr = NULL; return 0; }{...} void *result = heap_caps_aligned_alloc_default(alignment, size); if (result != NULL) { /* Modify output pointer only on success */ *out_ptr = result; return 0; }{...} /* Note: error returned, not set via errno! */ return ENOMEM; }{ ... } /* No-op function, used to force linking this file, instead of the heap implementation from newlib. *//* ... */ void newlib_include_heap_impl(void) { }{ ... } /* The following functions are implemented by newlib's heap allocator, but aren't available in the heap component. Define them as non-functional stubs here, so that the application can not cause the newlib heap implementation to be linked in *//* ... */ int malloc_trim(size_t pad) { return 0; // indicates failure }{ ... } size_t malloc_usable_size(void* p) { return 0; }{ ... } void malloc_stats(void) { }{ ... } int mallopt(int parameter_number, int parameter_value) { return 0; // indicates failure }{ ... } struct mallinfo mallinfo(void) { struct mallinfo dummy = {0}; return dummy; }{...} void* valloc(size_t n) __attribute__((alias("malloc"))); void* pvalloc(size_t n) __attribute__((alias("malloc"))); void cfree(void* p) __attribute__((alias("free")));
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