add initial support for using mimalloc with address sanitizer support; use -DMI_ASAN=ON

CMakeLists.txt

@@ -11,6 +11,7 @@ option(MI_OVERRIDE          "Override the standard malloc interface (e.g. define
 option(MI_XMALLOC           "Enable abort() call on memory allocation failure by default" OFF)
 option(MI_SHOW_ERRORS       "Show error and warning messages by default (only enabled by default in DEBUG mode)" OFF)
 option(MI_VALGRIND          "Compile with Valgrind support (adds a small overhead)" OFF)
+option(MI_ASAN              "Compile with address sanitizer support (adds a small overhead)" OFF)
 option(MI_USE_CXX           "Use the C++ compiler to compile the library (instead of the C compiler)" OFF)
 option(MI_SEE_ASM           "Generate assembly files" OFF)
 option(MI_OSX_INTERPOSE     "Use interpose to override standard malloc on macOS" ON)
@@ -139,6 +140,25 @@ if(MI_VALGRIND)
   endif()
 endif()
 
+if(MI_ASAN)
+  if (MI_VALGRIND)
+    set(MI_ASAN OFF)
+    message(WARNING "Cannot enable address sanitizer support with also Valgrind support enabled (MI_ASAN=OFF)")
+  else()
+    CHECK_INCLUDE_FILES("sanitizer/asan_interface.h" MI_HAS_ASANH)
+    if (NOT MI_HAS_ASANH)
+      set(MI_ASAN OFF)
+      message(WARNING "Cannot find the 'sanitizer/asan_interface.h' -- install address sanitizer support first")
+      message(STATUS  "Compile **without** address sanitizer support (MI_ASAN=OFF)")
+    else()
+      message(STATUS "Compile with address sanitizer support (MI_ASAN=ON)")
+      list(APPEND mi_defines MI_ASAN=1)
+      list(APPEND mi_cflags -fsanitize=address)
+      list(APPEND CMAKE_EXE_LINKER_FLAGS -fsanitize=address)
+    endif()
+  endif()
+endif()
+
 if(MI_SEE_ASM)
   message(STATUS "Generate assembly listings (MI_SEE_ASM=ON)")
   list(APPEND mi_cflags -save-temps)
@@ -296,6 +316,9 @@ if(MI_SECURE)
 endif()
 if(MI_VALGRIND)
   set(mi_basename "${mi_basename}-valgrind")
+endif()  
+if(MI_ASAN)
+  set(mi_basename "${mi_basename}-asan")
 endif()
 string(TOLOWER "${CMAKE_BUILD_TYPE}" CMAKE_BUILD_TYPE_LC)
 if(NOT(CMAKE_BUILD_TYPE_LC MATCHES "^(release|relwithdebinfo|minsizerel|none)$"))

include/mimalloc-track.h

@@ -10,12 +10,13 @@ terms of the MIT license. A copy of the license can be found in the file
 
 // ------------------------------------------------------
 // Track memory ranges with macros for tools like Valgrind
-// or other memory checkers.
+// address sanitizer, or other memory checkers.
 // ------------------------------------------------------
 
 #if MI_VALGRIND
 
 #define MI_TRACK_ENABLED 1
+#define MI_TRACK_TOOL    "valgrind"
 
 #include <valgrind/valgrind.h>
 #include <valgrind/memcheck.h>
@@ -23,17 +24,35 @@ terms of the MIT license. A copy of the license can be found in the file
 #define mi_track_malloc(p,size,zero)        VALGRIND_MALLOCLIKE_BLOCK(p,size,MI_PADDING_SIZE /*red zone*/,zero)
 #define mi_track_resize(p,oldsize,newsize)  VALGRIND_RESIZEINPLACE_BLOCK(p,oldsize,newsize,MI_PADDING_SIZE /*red zone*/)  
 #define mi_track_free(p)                    VALGRIND_FREELIKE_BLOCK(p,MI_PADDING_SIZE /*red zone*/)
+#define mi_track_free_size(p,_size)         mi_track_free(p)
 #define mi_track_mem_defined(p,size)        VALGRIND_MAKE_MEM_DEFINED(p,size)
 #define mi_track_mem_undefined(p,size)      VALGRIND_MAKE_MEM_UNDEFINED(p,size)
 #define mi_track_mem_noaccess(p,size)       VALGRIND_MAKE_MEM_NOACCESS(p,size)
 
+#elif MI_ASAN
+
+#define MI_TRACK_ENABLED 1
+#define MI_TRACK_TOOL    "asan"
+
+#include <sanitizer/asan_interface.h>
+
+#define mi_track_malloc(p,size,zero)        ASAN_UNPOISON_MEMORY_REGION(p,size)
+#define mi_track_resize(p,oldsize,newsize)  ASAN_POISON_MEMORY_REGION(p,oldsize); ASAN_UNPOISON_MEMORY_REGION(p,newsize)
+#define mi_track_free(p)                    ASAN_POISON_MEMORY_REGION(p,mi_usable_size(p))
+#define mi_track_free_size(p,size)          ASAN_POISON_MEMORY_REGION(p,size)
+#define mi_track_mem_defined(p,size)        ASAN_UNPOISON_MEMORY_REGION(p,size)
+#define mi_track_mem_undefined(p,size)      ASAN_UNPOISON_MEMORY_REGION(p,size)
+#define mi_track_mem_noaccess(p,size)       ASAN_POISON_MEMORY_REGION(p,size)
+
 #else
 
 #define MI_TRACK_ENABLED 0
+#define MI_TRACK_TOOL    "none"
 
 #define mi_track_malloc(p,size,zero)  
 #define mi_track_resize(p,oldsize,newsize)  
-#define mi_track_free(p)              
+#define mi_track_free(p,size)          
+#define mi_track_free_size(p,_size)
 #define mi_track_mem_defined(p,size)  
 #define mi_track_mem_undefined(p,size)  
 #define mi_track_mem_noaccess(p,size)  

src/alloc-aligned.c

@@ -80,7 +80,7 @@ static mi_decl_noinline void* mi_heap_malloc_zero_aligned_at_fallback(mi_heap_t*
   
   #if MI_TRACK_ENABLED
   if (p != aligned_p) {
-    mi_track_free(p);
+    mi_track_free_size(p, oversize);
     mi_track_malloc(aligned_p, size, zero);
   }
   else {

src/alloc.c

@@ -697,7 +697,7 @@ void* _mi_heap_realloc_zero(mi_heap_t* heap, void* p, size_t newsize, bool zero)
   const size_t size = _mi_usable_size(p,"mi_realloc"); // also works if p == NULL (with size 0)
   if mi_unlikely(newsize <= size && newsize >= (size / 2) && newsize > 0) {  // note: newsize must be > 0 or otherwise we return NULL for realloc(NULL,0)
     // todo: adjust potential padding to reflect the new size?
-    mi_track_free(p);
+    mi_track_free_size(p, size);
     mi_track_malloc(p,newsize,true);
     return p;  // reallocation still fits and not more than 50% waste
   }

src/init.c

@@ -558,6 +558,7 @@ void mi_process_init(void) mi_attr_noexcept {
   _mi_verbose_message("debug level : %d\n", MI_DEBUG);
   #endif
   _mi_verbose_message("secure level: %d\n", MI_SECURE);
+  _mi_verbose_message("mem tracking: %s\n", MI_TRACK_TOOL);
   mi_thread_init();
 
   #if defined(_WIN32) && !defined(MI_SHARED_LIB)