newlib: when compiling with GCC8, use newlib headers and libraries from toolchain

components/newlib/heap.c

@@ -0,0 +1,126 @@
+// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <string.h>
+#include <stdlib.h>
+#include <sys/reent.h>
+#include <malloc.h>
+#include "esp_heap_caps.h"
+
+
+/*
+ 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 );
+
+
+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;
+}
+
+/* No-op function, used to force linking this file,
+   instead of the heap implementation from newlib.
+ */
+void newlib_include_heap_impl()
+{
+}
+
+/* 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
+ */
+void* memalign(size_t alignment, size_t n)
+{
+    extern void memalign_function_was_linked_but_unsupported_in_esp_idf(void);
+    memalign_function_was_linked_but_unsupported_in_esp_idf();
+    return NULL;
+}
+
+int malloc_trim(size_t pad)
+{
+    return 0; // indicates failure
+}
+
+size_t malloc_usable_size(void* p)
+{
+    return 0;
+}
+
+void malloc_stats()
+{
+}
+
+int mallopt(int parameter_number, int parameter_value)
+{
+    return 0; // indicates failure
+}
+
+struct mallinfo mallinfo()
+{
+    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")));