debug code

yamt · Jun 12, 2023 · f4024a1 · f4024a1
1 parent 6342344
commit f4024a1
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Showing 2 changed files with 10 additions and 0 deletions.
diff --git a/dlmalloc/src/malloc.c b/dlmalloc/src/malloc.c
@@ -4719,6 +4719,7 @@ void dlfree(void* mem) {
 
   if (mem != 0) {
     mchunkptr p  = mem2chunk(mem);
+    memset(mem, 0xaa, chunksize(p) - overhead_for(p));
 #if FOOTERS
     mstate fm = get_mstate_for(p);
     if (!ok_magic(fm)) {

diff --git a/libc-top-half/musl/src/thread/pthread_create.c b/libc-top-half/musl/src/thread/pthread_create.c
@@ -305,8 +305,14 @@ static int start_c11(void *p)
 void wasi_thread_start(int tid, void *p);
 hidden void *__dummy_reference = wasi_thread_start;
 
+void *gcanary;
+
 hidden void __wasi_thread_start_C(int tid, void *p)
 {
+	char canary[100];
+	canary[0] = 123;
+	canary[99] = 99;
+	gcanary = canary; // just to avoid "canary" being optimized out
 	struct start_args *args = p;
 	pthread_t self = __pthread_self();
 	// Set the thread ID (TID) on the pthread structure. The TID is stored
@@ -316,6 +322,9 @@ hidden void __wasi_thread_start_C(int tid, void *p)
 	atomic_store((atomic_int *) &(self->tid), tid);
 	// Execute the user's start function.
 	__pthread_exit(args->start_func(args->start_arg));
+	if (canary[0] != 123 || canary[99] != 99) {
+		a_crash();
+	}
 }
 #endif