Fix pthread dbg wrapper when passed object (#24170)

Without this change we see `done init [object Object]`.

Author: sbc100

src/lib/libpthread.js

@@ -96,16 +96,16 @@ var LibraryPThread = {
         ) {
           t = _pthread_self();
         }
-        return `w:${workerID},t:${ptrToString(t)}: `;
+        return `w:${workerID},t:${ptrToString(t)}:`;
       }
 
       // Prefix all err()/dbg() messages with the calling thread ID.
       var origDbg = dbg;
-      dbg = (...args) => origDbg(pthreadLogPrefix() + args.join(' '));
+      dbg = (...args) => origDbg(pthreadLogPrefix(), ...args);
 #if PTHREADS_DEBUG
       // With PTHREADS_DEBUG also prefix all err() messages.
       var origErr = err;
-      err = (...args) => origErr(pthreadLogPrefix() + args.join(' '));
+      err = (...args) => origErr(pthreadLogPrefix(), ...args);
 #endif
     },
 #endif

test/test_other.py

@@ -14982,12 +14982,12 @@ def test_itimer_proxy_to_pthread(self):
   @node_pthreads
   def test_dbg(self):
     create_file('pre.js', '''
-    dbg('start');
-    Module.onRuntimeInitialized = () => dbg('done init');
+    dbg('start', { foo: 1});
+    Module.onRuntimeInitialized = () => dbg('done init', { bar: 1});
     ''')
     expected = '''\
-start
-w:0,t:0x[0-9a-fA-F]+: done init
+start { foo: 1 }
+w:0,t:0x[0-9a-fA-F]+: done init { bar: 1 }
 hello, world!
 w:0,t:0x[0-9a-fA-F]+: native dbg message
 w:0,t:0x[0-9a-fA-F]+: hello