subprojects: Prepare for release

The Vala README only mentions autotools instructions, and when Vala is
compiled that way the -frida suffix is not added to the version string,
and the frida-core check for Vala fails.

Therefore, clarify that Vala needs to be built from source with Meson.

lib/agent/agent.vala

@@ -1400,12 +1400,12 @@ namespace Frida.Agent {
 				if (nb_api.unload_library == null)
 					parameters.append ("|eternal|sticky");
 				/*
-				 * Disable ExitMonitor to work around a bug in Android's libndk_translation.so on Android 11.
-				 * We need to avoid modifying libc.so ranges that the translator potentially depends on, to
-				 * avoid blowing up when Interceptor's CPU cache flush results in the translated code being
-				 * discarded, which seems like an edge-case the translator doesn't handle.
+				 * Disable Exceptor and ExitMonitor to work around a bug in Android's libndk_translation.so
+				 * on Android 11. We need to avoid modifying libc.so ranges that the translator potentially
+				 * depends on, to avoid blowing up when Interceptor's CPU cache flush results in the translated
+				 * code being discarded, which seems like an edge-case the translator doesn't handle.
 				 */
-				parameters.append ("|exit-monitor:off");
+				parameters.append ("|exceptor:off|exit-monitor:off");
 
 				emulated_bridge_state = new BridgeState (parameters.str);
 

lib/base/buffer.vala

@@ -446,7 +446,7 @@ namespace Frida {
 
 		public string read_fixed_string (size_t offset, size_t size) throws Error {
 			string * start = (string *) get_pointer (offset, size);
-			size_t max_length = size - offset;
+			size_t max_length = size_t.min (size, this.size - offset);
 			string * end = memchr (start, 0, max_length);
 			size_t n;
 			if (end != null)

lib/base/promise.vala

@@ -46,7 +46,8 @@ namespace Frida {
 			}
 			private GLib.Error? _error;
 
-			private Gee.ArrayQueue<CompletionFuncEntry> on_complete;
+			private Gee.ArrayQueue<CompletionFuncEntry>? on_complete;
+			private Gee.ArrayQueue<ThenHandlerEntry<T>>? on_then;
 
 			public async T wait_async (Cancellable? cancellable) throws Frida.Error, IOError {
 				if (_ready)
@@ -74,7 +75,21 @@ namespace Frida {
 				return get_result ();
 			}
 
-			private T get_result () throws Frida.Error, IOError {
+			public void then (owned FutureCompletionHandler<T> handler) {
+				if (_ready) {
+					schedule (() => {
+						handler (this);
+						return Source.REMOVE;
+					});
+					return;
+				}
+
+				if (on_then == null)
+					on_then = new Gee.ArrayQueue<ThenHandlerEntry<T>> ();
+				on_then.offer (new ThenHandlerEntry<T> ((owned) handler));
+			}
+
+			public T get_result () throws Frida.Error, IOError {
 				if (error != null) {
 					if (error is Frida.Error)
 						throw (Frida.Error) error;
@@ -111,19 +126,32 @@ namespace Frida {
 			internal void transition_to_ready () {
 				_ready = true;
 
-				if (on_complete != null && !on_complete.is_empty) {
-					var source = new IdleSource ();
-					source.set_priority (Priority.HIGH);
-					source.set_callback (() => {
-						CompletionFuncEntry? entry;
-						while ((entry = on_complete.poll ()) != null)
-							entry.func ();
-						on_complete = null;
-						return false;
+				if (on_complete != null || on_then != null) {
+					schedule (() => {
+						if (on_complete != null) {
+							CompletionFuncEntry? entry;
+							while ((entry = on_complete.poll ()) != null)
+								entry.func ();
+							on_complete = null;
+						}
+
+						if (on_then != null) {
+							ThenHandlerEntry? entry;
+							while ((entry = on_then.poll ()) != null)
+								entry.handler (this);
+							on_then = null;
+						}
+
+						return Source.REMOVE;
 					});
-					source.attach (MainContext.get_thread_default ());
 				}
 			}
+
+			private static void schedule (owned SourceFunc function) {
+				var source = new IdleSource ();
+				source.set_callback ((owned) function);
+				source.attach (MainContext.get_thread_default ());
+			}
 		}
 
 		private class CompletionFuncEntry {
@@ -133,6 +161,14 @@ namespace Frida {
 				this.func = (owned) func;
 			}
 		}
+
+		private class ThenHandlerEntry<T> {
+			public FutureCompletionHandler<T> handler;
+
+			public ThenHandlerEntry (owned FutureCompletionHandler<T> handler) {
+				this.handler = (owned) handler;
+			}
+		}
 	}
 
 	public interface Future<T> : Object {
@@ -140,5 +176,9 @@ namespace Frida {
 		public abstract T? value { get; }
 		public abstract GLib.Error? error { get; }
 		public abstract async T wait_async (Cancellable? cancellable) throws Frida.Error, IOError;
+		public abstract void then (owned FutureCompletionHandler<T> handler);
+		public abstract T get_result () throws Frida.Error, IOError;
 	}
+
+	public delegate void FutureCompletionHandler<T> (Future<T> future);
 }

meson.build

@@ -12,9 +12,11 @@ if not meson.get_compiler('vala').version().endswith('-frida')
   error('''Incompatible Vala compiler detected.
 
 Frida currently relies on features not yet upstream. Grab the Frida-optimized
-Vala compiler from:
+Vala sources from:
 
-    https://github.com/frida/vala''')
+    https://github.com/frida/vala
+
+and compile them with Meson.''')
 endif
 
 c_languages = ['c', 'cpp']
@@ -269,12 +271,14 @@ if host_os == 'linux'
 #endif
 '''
   if cc.compiles(glibc_src, name: 'compiling for glibc')
-    cdata.set('HAVE_GLIBC', 1)
+    libc = 'glibc'
   elif cc.compiles(uclibc_src, name: 'compiling for uClibc')
-    cdata.set('HAVE_UCLIBC', 1)
+    libc = 'uclibc'
   else
-    cdata.set('HAVE_MUSL', 1)
+    libc = 'musl'
   endif
+  cdata.set('HAVE_' + libc.to_upper(), 1)
+  vala_flags += '--define=' + libc.to_upper()
 endif
 
 if get_option('b_sanitize') == 'address'

subprojects/frida-gum.wrap

@@ -1,6 +1,6 @@
 [wrap-git]
 url = https://github.com/frida/frida-gum.git
-revision = 17.2.2
+revision = 17.2.8
 depth = 1
 
 [provide]