Fix wasm backend compilation

include/mimalloc/internal.h

@@ -307,6 +307,14 @@ static inline uintptr_t _mi_align_down(uintptr_t sz, size_t alignment) {
   }
 }
 
+ __attribute__((__unused__)) static void* mi_align_up_ptr(void* p, size_t alignment) {
+  return (void*)_mi_align_up((uintptr_t)p, alignment);
+}
+
+ __attribute__((__unused__)) static void* mi_align_down_ptr(void* p, size_t alignment) {
+  return (void*)_mi_align_down((uintptr_t)p, alignment);
+}
+
 // Divide upwards: `s <= _mi_divide_up(s,d)*d < s+d`.
 static inline uintptr_t _mi_divide_up(uintptr_t size, size_t divider) {
   mi_assert_internal(divider != 0);

src/os.c

@@ -73,14 +73,6 @@ void _mi_os_init(void) {
 bool _mi_os_decommit(void* addr, size_t size, mi_stats_t* stats);
 bool _mi_os_commit(void* addr, size_t size, bool* is_zero, mi_stats_t* tld_stats);
 
-static void* mi_align_up_ptr(void* p, size_t alignment) {
-  return (void*)_mi_align_up((uintptr_t)p, alignment);
-}
-
-static void* mi_align_down_ptr(void* p, size_t alignment) {
-  return (void*)_mi_align_down((uintptr_t)p, alignment);
-}
-
 
 /* -----------------------------------------------------------
   aligned hinting

src/prim/wasm/prim.c

@@ -7,6 +7,10 @@ terms of the MIT license. A copy of the license can be found in the file
 
 // This file is included in `src/prim/prim.c`
 
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
 #include "mimalloc.h"
 #include "mimalloc/internal.h"
 #include "mimalloc/atomic.h"
@@ -36,26 +40,17 @@ int _mi_prim_free(void* addr, size_t size ) {
 
 
 //---------------------------------------------
-// Allocation: sbrk or memory_grow
+// Allocation: sbrk
 //---------------------------------------------
 
-#if defined(MI_USE_SBRK)
-  static void* mi_memory_grow( size_t size ) {
-    void* p = sbrk(size);
-    if (p == (void*)(-1)) return NULL;
-    #if !defined(__wasm__) // on wasm this is always zero initialized already.
-    memset(p,0,size);
-    #endif
-    return p;
-  }
-#elif defined(__wasm__)
-  static void* mi_memory_grow( size_t size ) {
-    size_t base = (size > 0 ? __builtin_wasm_memory_grow(0,_mi_divide_up(size, _mi_os_page_size()))
-                            : __builtin_wasm_memory_size(0));
-    if (base == SIZE_MAX) return NULL;
-    return (void*)(base * _mi_os_page_size());
-  }
+static void* mi_memory_grow( size_t size ) {
+  void* p = sbrk(size);
+  if (p == (void*)(-1)) return NULL;
+#if !defined(__wasm__) // on wasm this is always zero initialized already.
+  memset(p,0,size);
 #endif
+  return p;
+}
 
 #if defined(MI_USE_PTHREADS)
 static pthread_mutex_t mi_heap_grow_mutex = PTHREAD_MUTEX_INITIALIZER;
@@ -96,7 +91,7 @@ static void* mi_prim_mem_grow(size_t size, size_t try_alignment) {
     if (base != NULL) {
       p = mi_align_up_ptr(base, try_alignment);
       if ((uint8_t*)p + size > (uint8_t*)base + alloc_size) {
-        // another thread used wasm_memory_grow/sbrk in-between and we do not have enough
+        // another thread used sbrk in-between and we do not have enough
         // space after alignment. Give up (and waste the space as we cannot shrink :-( )
         // (in `mi_os_mem_alloc_aligned` this will fall back to overallocation to align)
         p = NULL;
@@ -105,7 +100,7 @@ static void* mi_prim_mem_grow(size_t size, size_t try_alignment) {
   }
   /*
   if (p == NULL) {
-    _mi_warning_message("unable to allocate sbrk/wasm_memory_grow OS memory (%zu bytes, %zu alignment)\n", size, try_alignment);
+    _mi_warning_message("unable to allocate sbrk OS memory (%zu bytes, %zu alignment)\n", size, try_alignment);
     errno = ENOMEM;
     return NULL;
   }
@@ -114,7 +109,7 @@ static void* mi_prim_mem_grow(size_t size, size_t try_alignment) {
   return p;
 }
 
-// Note: the `try_alignment` is just a hint and the returned pointer is not guaranteed to be aligned.
+// Note: the `try_alignment` argument is respected by over-allocating.
 int _mi_prim_alloc(size_t size, size_t try_alignment, bool commit, bool allow_large, bool* is_large, bool* is_zero, void** addr) {
   MI_UNUSED(allow_large); MI_UNUSED(commit);
   *is_large = false;