Define memory allocation and deallocation functions

src/mem/util/mem_utils.h

@@ -2,12 +2,49 @@
 #define MEM_UTILS_H
 
 #include "aliases.h"
+#include "platform.h"
+
+#if defined(WAPP_PLATFORM_WINDOWS)
+#include <Windows.h>
+#include <memoryapi.h>
+#elif defined(WAPP_PLATFORM_POSIX)
+#include <sys/mman.h>
+#else
+#error "Unrecognised platform"
+#endif
 
 #ifdef __cplusplus
 extern "C" {
 #endif // __cplusplus
 
+typedef enum mem_access {
+  WAPP_MEM_ACCESS_NONE,
+  WAPP_MEM_ACCESS_READ_ONLY,
+  WAPP_MEM_ACCESS_EXEC_ONLY,
+  WAPP_MEM_ACCESS_READ_WRITE,
+  WAPP_MEM_ACCESS_READ_EXEC,
+  WAPP_MEM_ACCESS_READ_WRITE_EXEC,
+} MemAccess;
+
+typedef enum mem_alloc_flags {
+#if defined(WAPP_PLATFORM_WINDOWS)
+  WAPP_MEM_ALLOC_RESERVE = MEM_RESERVE,
+  WAPP_MEM_ALLOC_COMMIT = MEM_COMMIT,
+#elif defined(WAPP_PLATFORM_POSIX)
+  WAPP_MEM_ALLOC_RESERVE = 0,
+  WAPP_MEM_ALLOC_COMMIT = MAP_POPULATE,
+#endif
+} MemAllocFlags;
+
+typedef enum mem_init_type {
+  WAPP_MEM_INIT_UNINITIALISED,
+  WAPP_MEM_INIT_INITIALISED,
+} MemInitType;
+
 void *wapp_mem_util_align_forward(void *ptr, u64 alignment);
+void *wapp_mem_util_alloc(u64 size, MemAccess access, MemAllocFlags flags,
+                          MemInitType type);
+void wapp_mem_util_free(void *ptr, u64 size);
 
 #ifdef __cplusplus
 }