[UNIKRAFT PATCH 18/18] lib/nolibc: Enable per-library allocator statistics

[Simon Kuenzer <simon.kuenzer@xxxxxxxxx>]

Instruments <stdlib.h> so that per-library allocator statistics are
possible. We make sure that libraries using `malloc()`, `free()`, and
company will resolve `uk_alloc_get_default()` within their scope so that
the individual wrapper allocators can be used.

Signed-off-by: Simon Kuenzer <simon.kuenzer@xxxxxxxxx>
---
 lib/nolibc/Makefile.uk      |  1 -
 lib/nolibc/include/stdlib.h | 39 ++++++++++++++++----
 lib/nolibc/malloc.c         | 72 -------------------------------------
 3 files changed, 33 insertions(+), 79 deletions(-)
 delete mode 100644 lib/nolibc/malloc.c

diff --git a/lib/nolibc/Makefile.uk b/lib/nolibc/Makefile.uk
index 9d4a9ec3..c6130e83 100644
--- a/lib/nolibc/Makefile.uk
+++ b/lib/nolibc/Makefile.uk
@@ -33,7 +33,6 @@ LIBNOLIBC_SRCS-y += $(LIBNOLIBC_BASE)/string.c
 LIBNOLIBC_SRCS-y += $(LIBNOLIBC_BASE)/getopt.c
 LIBNOLIBC_SRCS-y += $(LIBNOLIBC_BASE)/sscanf.c
 LIBNOLIBC_SRCS-y += $(LIBNOLIBC_BASE)/asprintf.c
-LIBNOLIBC_SRCS-$(CONFIG_LIBUKALLOC) += $(LIBNOLIBC_BASE)/malloc.c
 
 
 LIBNOLIBC_SRCS-y += $(LIBNOLIBC_BASE)/qsort.c
diff --git a/lib/nolibc/include/stdlib.h b/lib/nolibc/include/stdlib.h
index 522da824..ba5951c8 100644
--- a/lib/nolibc/include/stdlib.h
+++ b/lib/nolibc/include/stdlib.h
@@ -29,6 +29,9 @@
 
 #include <uk/config.h>
 #include <uk/essentials.h>
+#if CONFIG_LIBUKALLOC
+#include <uk/alloc.h>
+#endif
 
 #ifdef __cplusplus
 extern "C" {
@@ -62,29 +65,53 @@ int atoi(const char *s);
 /* Allocate size bytes of memory. Returns pointer to start of allocated memory,
  * or NULL on failure.
  */
-void *malloc(size_t size);
+static inline void *malloc(size_t size)
+{
+       return uk_malloc(uk_alloc_get_default(), size);
+}
+
 /* Release memory previously allocated by malloc(). ptr must be a pointer
  * previously returned by malloc(), otherwise undefined behavior will occur.
  */
-void free(void *ptr);
+static inline void free(void *ptr)
+{
+       return uk_free(uk_alloc_get_default(), ptr);
+}
+
 /* Allocate memory for an array of nmemb elements of size bytes. Returns
  * pointer to start of allocated memory, or NULL on failure.
  */
-void *calloc(size_t nmemb, size_t size);
+static inline void *calloc(size_t nmemb, size_t size)
+{
+       return uk_calloc(uk_alloc_get_default(), nmemb, size);
+}
+
 /* Change the size of the memory block pointed to by ptr to size bytes.
  * Returns a pointer to the resized memory area. If the area pointed to was
  * moved, a free(ptr) is done.
  */
-void *realloc(void *ptr, size_t size);
+static inline void *realloc(void *ptr, size_t size)
+{
+       return uk_realloc(uk_alloc_get_default(), ptr, size);
+}
+
 /* Allocate size bytes of memory, aligned to align bytes, and return the
  * pointer to that area in *memptr. Returns 0 on success, and a non-zero error
  * value on failure.
  */
-int posix_memalign(void **memptr, size_t align, size_t size);
+static inline int posix_memalign(void **memptr, size_t align, size_t size)
+{
+       return uk_posix_memalign(uk_alloc_get_default(),
+                                memptr, align, size);
+}
+
 /* Allocate size bytes of memory, aligned to align bytes. Returns pointer to
  * start of allocated memory, or NULL on failure.
  */
-void *memalign(size_t align, size_t size);
+static inline void *memalign(size_t align, size_t size)
+{
+       return uk_memalign(uk_alloc_get_default(), align, size);
+}
 #endif /* CONFIG_LIBUKALLOC */
 
 void abort(void) __noreturn;
diff --git a/lib/nolibc/malloc.c b/lib/nolibc/malloc.c
deleted file mode 100644
index faf88052..00000000
--- a/lib/nolibc/malloc.c
+++ /dev/null
@@ -1,72 +0,0 @@
-/* SPDX-License-Identifier: BSD-3-Clause */
-/*
- * Authors: Florian Schmidt <florian.schmidt@xxxxxxxxx>
- *
- * Copyright (c) 2017, NEC Europe Ltd., NEC Corporation. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the copyright holder nor the names of its
- *    contributors may be used to endorse or promote products derived from
- *    this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
- * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- * THIS HEADER MAY NOT BE EXTRACTED OR MODIFIED IN ANY WAY.
- */
-
-#include <stddef.h>
-#include <stdint.h>
-#include <sys/types.h>
-#include <errno.h>
-#include <uk/alloc.h>
-#include <uk/assert.h>
-#include <uk/essentials.h>
-
-void *malloc(size_t size)
-{
-       return uk_malloc(uk_alloc_get_default(), size);
-}
-
-void *calloc(size_t nmemb, size_t size)
-{
-       return uk_calloc(uk_alloc_get_default(), nmemb, size);
-}
-
-void *realloc(void *ptr, size_t size)
-{
-       return uk_realloc(uk_alloc_get_default(), ptr, size);
-}
-
-int posix_memalign(void **memptr, size_t align, size_t size)
-{
-       return uk_posix_memalign(uk_alloc_get_default(),
-                                memptr, align, size);
-}
-
-void *memalign(size_t align, size_t size)
-{
-       return uk_memalign(uk_alloc_get_default(), align, size);
-}
-
-void free(void *ptr)
-{
-       return uk_free(uk_alloc_get_default(), ptr);
-}
-- 
2.20.1