Replace deprecated malloc_hook

util/README

@@ -17,7 +17,7 @@ Build by:
 
 and use by:
 
-	LD_PRELOAD=$PWD/malloc-stats.so app-to-run
+	LD_PRELOAD=$(blddir)/util/libmalloc-stats.so app-to-run
 
 cairo-trace
 -----------

util/malloc-stats.c

@@ -170,76 +170,54 @@ func_stats_add (const void *caller, int is_realloc, size_t size)
 
 /* wrapper stuff */
 
-#include <malloc.h>
+#include <dlfcn.h>
 
-static void *(*old_malloc)(size_t, const void *);
-static void *(*old_realloc)(void *, size_t, const void *);
+static void *(*old_malloc)(size_t);
+static void *(*old_realloc)(void *, size_t);
+static int enable_hook = 0;
 
-static void *my_malloc(size_t, const void *);
-static void *my_realloc(void *, size_t, const void *);
-
-static void
-save_hooks (void)
+void *
+malloc(size_t size)
 {
-	old_malloc  = __malloc_hook;
-	old_realloc = __realloc_hook;
-}
-
-static void
-old_hooks (void)
-{
-	__malloc_hook  = old_malloc;
-	__realloc_hook  = old_realloc;
-}
-
-static void
-my_hooks (void)
-{
-	/* should always save the current value */
-	save_hooks ();
-
-	__malloc_hook  = my_malloc;
-	__realloc_hook  = my_realloc;
-}
-
-static void *
-my_malloc(size_t size, const void *caller)
-{
-	void *ret;
-
-	old_hooks ();
-
+    if (enable_hook) {
+	enable_hook = 0;
+	void *caller = __builtin_return_address(0);
 	func_stats_add (caller, 0, size);
+	enable_hook = 1;
+    }
 
-	ret = malloc (size);
-	my_hooks ();
-
-	return ret;
+    return old_malloc (size);
 }
 
-static void *
-my_realloc(void *ptr, size_t size, const void *caller)
+void *
+realloc(void *ptr, size_t size)
 {
-	void *ret;
-
-	old_hooks ();
-
+    if (enable_hook) {
+	enable_hook = 0;
+	void *caller = __builtin_return_address(0);
 	func_stats_add (caller, 1, size);
+	enable_hook = 1;
+    }
 
-	ret = realloc (ptr, size);
-	my_hooks ();
-
-	return ret;
+    return old_realloc (ptr, size);
 }
 
-static void
-my_init_hook(void) {
-	my_hooks ();
+static void __attribute__ ((constructor))
+init(void)
+{
+    old_malloc = dlsym(RTLD_NEXT, "malloc");
+    if (!old_malloc) {
+	fprintf(stderr, "%s\n", dlerror());
+	exit(1);
+    }
+    old_realloc = dlsym(RTLD_NEXT, "realloc");
+    if (!old_realloc) {
+	fprintf(stderr, "%s\n", dlerror());
+	exit(1);
+    }
+    enable_hook = 1;
 }
 
-void (*__volatile __malloc_initialize_hook) (void) = my_init_hook;
-
-
 /* reporting */
 
 #include <locale.h>
@@ -319,7 +297,7 @@ malloc_stats (void)
 	unsigned int i, j;
 	struct func_stat_t *sorted_func_stats;
 
-	old_hooks ();
+	enable_hook = 0;
 
 	if (! func_stats_num)
 		return;

util/meson.build

@@ -59,6 +59,6 @@ foreach util : cairo_utils
   )
 endforeach
 
-if cc.has_header_symbol('malloc.h', '__malloc_hook') and cc.has_header('execinfo.h')
-  libmallocstats = library('malloc-stats', 'malloc-stats.c')
+if conf.get('CAIRO_HAS_DLSYM', 0) == 1 and cc.has_header('execinfo.h')
+  libmallocstats = library('malloc-stats', 'malloc-stats.c', dependencies : dl_dep)
 endif