diff --git a/mtelf.c b/mtelf.c
index 6e0552c..3cd4e80 100644
--- a/mtelf.c
+++ b/mtelf.c
@@ -175,7 +175,8 @@ static int populate_this_symtab(struct mt_elf *mte, struct library *lib, Elf_Dat
 
 		arch_addr_t addr = ARCH_ADDR_T(sym.st_value + mte->bias);
 
-		if (!library_find_symbol(lib, addr)) {
+		struct library_symbol *libsym = library_find_symbol(lib, addr);
+		if (!libsym) {
 			struct library_symbol *libsym = library_symbol_new(lib, addr, func);
 
 			if (!libsym) {
@@ -183,6 +184,11 @@ static int populate_this_symtab(struct mt_elf *mte, struct library *lib, Elf_Dat
 				continue;
 			}
 		}
+		else {
+			/* handle symbol alias */
+			if (libsym->func->level > func->level)
+				libsym->func = func;
+		}
 	}
 
 	return 0;
diff --git a/report.c b/report.c
index 0e32a7a..4c29ee6 100644
--- a/report.c
+++ b/report.c
@@ -313,34 +313,33 @@ static int _report_mremap(struct task *task, struct library_symbol *libsym)
 }
 
 static const struct function flist[] = {
-	{ "malloc",		2,	NULL,		_report_malloc },
-	{ "free",		3,	report_free,	NULL },
-	{ "realloc",		4,	report_realloc,	_report_realloc },
-	{ "calloc",		5,	NULL,		_report_calloc },
-	{ "posix_memalign",	6,	NULL,		_report_posix_memalign },
-	{ "mmap",		7,	NULL,		_report_mmap },
-	{ "mmap64",		8,	NULL,		_report_mmap64 },
-	{ "munmap",		9,	report_munmap,	_null },
-	{ "memalign",		10,	NULL,		_report_memalign },
-	{ "aligned_alloc",	11,	NULL,		_report_aligned_alloc },
-	{ "valloc",		12,	NULL,		_report_valloc },
-	{ "pvalloc",		13,	NULL,		_report_pvalloc },
-	{ "mremap",		14,	report_mremap,	_report_mremap},
-	{ "cfree",		15,	report_free,	NULL },
-	{ "vfree",		16,	report_free,	NULL },
+	{ "malloc",			0,	2,	NULL,		_report_malloc },
+	{ "free",			0,	3,	report_free,	NULL },
+	{ "realloc",			0,	4,	report_realloc,	_report_realloc },
+	{ "calloc",			0,	5,	NULL,		_report_calloc },
+	{ "posix_memalign",		0,	6,	NULL,		_report_posix_memalign },
+	{ "mmap",			0,	7,	NULL,		_report_mmap },
+	{ "mmap64",			1,	8,	NULL,		_report_mmap64 },
+	{ "munmap",			0,	9,	report_munmap,	_null },
+	{ "memalign",			0,	10,	NULL,		_report_memalign },
+	{ "aligned_alloc",		1,	11,	NULL,		_report_aligned_alloc },
+	{ "valloc",			1,	12,	NULL,		_report_valloc },
+	{ "pvalloc",			1,	13,	NULL,		_report_pvalloc },
+	{ "mremap",			0,	14,	report_mremap,	_report_mremap},
+	{ "cfree",			1,	15,	report_free,	NULL },
 
 	/*
 	 * support for Google gperftools
 	 * the c++ operators new and delete do not call malloc() and free()
 	 */
-	{ "tc_delete",			17,	report_free,	NULL },
-	{ "tc_deletearray",		18,	report_free,	NULL },
-	{ "tc_deletearray_nothrow",	19,	report_free,	NULL },
-	{ "tc_delete_nothrow",		20,	report_free,	NULL },
-	{ "tc_new",			21,	NULL,	_report_malloc },
-	{ "tc_newarray",		22,	NULL,	_report_malloc },
-	{ "tc_newarray_nothrow",	23,	NULL,	_report_malloc },
-	{ "tc_new_nothrow",		24,	NULL,	_report_malloc },
+	{ "tc_delete",			1,	17,	report_free,	NULL },
+	{ "tc_deletearray",		1,	18,	report_free,	NULL },
+	{ "tc_deletearray_nothrow",	1,	19,	report_free,	NULL },
+	{ "tc_delete_nothrow",		1,	20,	report_free,	NULL },
+	{ "tc_new",			1,	21,	NULL,	_report_malloc },
+	{ "tc_newarray",		1,	22,	NULL,	_report_malloc },
+	{ "tc_newarray_nothrow",	1,	23,	NULL,	_report_malloc },
+	{ "tc_new_nothrow",		1,	24,	NULL,	_report_malloc },
 };
 
 const struct function *flist_matches_symbol(const char *sym_name)
diff --git a/report.h b/report.h
index 600961f..41f9bb9 100644
--- a/report.h
+++ b/report.h
@@ -29,9 +29,15 @@
 #define	REPORT_LEAVE	2
 
 struct function {
+	/* symbol name */
 	const char *name;
+	/* level for aliased symbol */
+	unsigned int level;
+	/* minimum number of hw breakpoints for using a hw bp */
 	unsigned int hw_bp_min;
+	/* report when function is entered */
 	int (*report_in)(struct task *task, struct library_symbol *libsym);
+	/* report when function is exited */
 	int (*report_out)(struct task *task, struct library_symbol *libsym);
 };