Add iOS on-device debugging support

.gitignore

@@ -88,6 +88,8 @@ pom.xml.tag
 !.brokk/project.properties
 dependency-reduced-pom.xml
 
+/artifacts/
+
 # Hugo website generated artifacts
 /docs/website/.hugo_build.lock
 /docs/website/hugo_stats.json

Ports/iOSPort/nativeSources/CodenameOne_GLAppDelegate.m

@@ -322,9 +322,17 @@ - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(
 
     // Override point for customization after application launch.
 
-    // Install signal handlers so that rather than the app crashing upon a BAD_ACCESS, the 
+    // Install signal handlers so that rather than the app crashing upon a BAD_ACCESS, the
     // app will throw an NPE.
     installSignalHandlers();
+#ifdef CN1_ON_DEVICE_DEBUG
+    // Spawn the on-device-debug listener thread. Non-blocking: if
+    // CN1ProxyWaitForAttach=YES the function also installs a translucent
+    // overlay UIWindow so the user sees a "Waiting for debugger..." message
+    // instead of the launch splash while the wait is in progress.
+    extern void cn1_debugger_start(void);
+    cn1_debugger_start();
+#endif
     [self cn1EnsureViewController];
 #ifndef CN1_USE_UI_SCENE
     [self cn1InstallRootViewControllerIntoWindow:self.window];
@@ -341,12 +349,26 @@ - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(
             }
         }
     }
+#ifdef CN1_ON_DEVICE_DEBUG
+    // Defer the VM callback until the on-device-debug proxy reports an IDE
+    // has attached (if CN1ProxyWaitForAttach=YES). Otherwise this fires
+    // synchronously and behaves identically to the non-debug build.
+    extern void cn1_debugger_run_when_ready(void (^onReady)(void));
+    id locationValueDeferred = [launchOptions objectForKey:UIApplicationLaunchOptionsLocationKey];
+    cn1_debugger_run_when_ready(^{
+        com_codename1_impl_ios_IOSImplementation_callback__(CN1_THREAD_GET_STATE_PASS_SINGLE_ARG);
+        if (locationValueDeferred) {
+            com_codename1_impl_ios_IOSImplementation_appDidLaunchWithLocation__(CN1_THREAD_GET_STATE_PASS_SINGLE_ARG);
+        }
+    });
+#else
     com_codename1_impl_ios_IOSImplementation_callback__(CN1_THREAD_GET_STATE_PASS_SINGLE_ARG);
-    
+
     id locationValue = [launchOptions objectForKey:UIApplicationLaunchOptionsLocationKey];
     if (locationValue) {
         com_codename1_impl_ios_IOSImplementation_appDidLaunchWithLocation__(CN1_THREAD_GET_STATE_PASS_SINGLE_ARG);
     }
+#endif
 
 #ifdef INCLUDE_CN1_BACKGROUND_FETCH
     [application setMinimumBackgroundFetchInterval:UIApplicationBackgroundFetchIntervalMinimum];

Ports/iOSPort/nativeSources/cn1_debugger.h

@@ -0,0 +1,126 @@
+/*
+ * Copyright (c) 2012, Codename One and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Codename One designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ */
+
+#ifndef CN1_DEBUGGER_H
+#define CN1_DEBUGGER_H
+
+#include "cn1_globals.h"
+
+#ifdef CN1_ON_DEVICE_DEBUG
+
+/**
+ * Boots the on-device-debug listener thread (non-blocking). Reads the
+ * desktop proxy host and port from Info.plist keys CN1ProxyHost /
+ * CN1ProxyPort, spawns a background thread that opens an outbound TCP
+ * connection, sends a HELLO event, and services commands (set/clear
+ * breakpoint, resume, step, get stack, get locals) in a loop.
+ *
+ * Returns immediately. If Info.plist has CN1ProxyWaitForAttach=YES, the
+ * function also installs a "Waiting for debugger" overlay UIWindow so the
+ * user sees something other than the splash while the wait is in progress;
+ * the overlay is dismissed automatically when {@link
+ * cn1_debugger_run_when_ready} fires its block.
+ */
+extern void cn1_debugger_start(void);
+
+/**
+ * Per-class instance-field descriptor emitted by the translator (one
+ * static array per generated class), then registered with the debugger
+ * runtime by a __attribute__((constructor)) shim that the translator also
+ * emits. The runtime uses these to answer CMD_GET_OBJECT_FIELDS without
+ * any reflection / RTTI from ParparVM.
+ *
+ * offset is from the start of the object struct (i.e. offsetof). type is
+ * a JVM type-char ('I','J','F','D','Z','B','S','C','L' — 'L' covers
+ * arrays too since arrays are JAVA_OBJECT in the struct).
+ */
+typedef struct cn1_field_entry {
+    int fieldId;
+    int offset;
+    char type;
+    const char* name;
+} cn1_field_entry;
+
+/**
+ * Translator-generated constructors call this once at process load to
+ * publish the class's field table to the debugger runtime. classId is
+ * the cn1_class_id_XXX constant.
+ */
+extern void cn1_debugger_register_fields(int classId,
+                                         const cn1_field_entry* table,
+                                         int count);
+
+/* --- Method invocation -------------------------------------------------- */
+
+/**
+ * Argument or scratch slot for a debugger-driven method invocation. All
+ * args travel as a flat array of these; the thunk reads the right field
+ * for each declared parameter. Floats/doubles round-trip through the bit
+ * width of their integer counterparts since debug clients pass them as
+ * raw 32/64-bit values.
+ */
+typedef union cn1_invoke_arg {
+    JAVA_INT     i;
+    JAVA_LONG    j;
+    JAVA_FLOAT   f;
+    JAVA_DOUBLE  d;
+    JAVA_OBJECT  o;
+} cn1_invoke_arg;
+
+/**
+ * Result of a debugger-driven method invocation. {@code type} is a JVM
+ * type-char ('V', 'I', 'J', 'F', 'D', 'L', 'Z', 'B', 'S', 'C') or 'X'
+ * if the call threw — in which case {@code value.o} carries the
+ * Throwable.
+ */
+typedef struct cn1_invoke_result {
+    char type;
+    cn1_invoke_arg value;
+} cn1_invoke_result;
+
+/**
+ * Translator-emitted per-method shim. The thunk unpacks {@code args}
+ * into the typed C parameters the underlying translated function
+ * expects, dispatches through {@code virtual_<sym>(...)} (instance) or
+ * the static symbol (static), and packs the return into {@code result}.
+ * Exceptions are caught and surfaced as result.type='X'.
+ *
+ * Runs on the suspended Java thread so it has a valid
+ * {@code threadStateData} context.
+ */
+typedef void (*cn1_invoke_thunk_t)(struct ThreadLocalData* threadStateData,
+                                   JAVA_OBJECT thisObj,
+                                   const cn1_invoke_arg* args,
+                                   cn1_invoke_result* result);
+
+/**
+ * Translator-emitted constructor registers each method's thunk at
+ * process load. methodId matches the same value the sidecar carries,
+ * so the proxy can look up by name → methodId and forward to the
+ * device with no further mapping.
+ */
+extern void cn1_debugger_register_invoke_thunk(int methodId, cn1_invoke_thunk_t thunk);
+
+#ifdef __BLOCKS__
+/**
+ * Defers the VM callback until the proxy reports the IDE has attached, so
+ * the AppDelegate can keep `didFinishLaunchingWithOptions` returning
+ * promptly and let UIKit draw the waiting overlay.
+ *
+ * If CN1ProxyWaitForAttach=NO (or the on-device-debug listener isn't
+ * configured), the block is invoked synchronously on the calling thread.
+ * Otherwise the block is stored and the proxy listener invokes it on the
+ * main queue once it receives the first RESUME from the desktop proxy.
+ */
+extern void cn1_debugger_run_when_ready(void (^onReady)(void));
+#endif
+
+#endif // CN1_ON_DEVICE_DEBUG
+#endif // CN1_DEBUGGER_H