Emulator support for dynamic mode on Intel architecture (#26565)

packages/flutter_tools/lib/src/android/android_device.dart

@@ -364,7 +364,8 @@ class AndroidDevice extends Device {
     final TargetPlatform devicePlatform = await targetPlatform;
     if (!(devicePlatform == TargetPlatform.android_arm ||
           devicePlatform == TargetPlatform.android_arm64) &&
-        !debuggingOptions.buildInfo.isDebug) {
+        !(debuggingOptions.buildInfo.isDebug ||
+          debuggingOptions.buildInfo.isDynamic)) {
       printError('Profile and release builds are only supported on ARM targets.');
       return LaunchResult.failed();
     }

packages/flutter_tools/lib/src/base/build.dart

@@ -458,8 +458,25 @@ class JITSnapshotter {
       outputPaths.add(isolateSnapshotInstructions);
     }
 
+    // There are a couple special cases below where we create a snapshot
+    // with only the data section, which only contains interpreted code.
+    bool supportsAppJit = true;
+
+    if (platform == TargetPlatform.android_x64 &&
+        getCurrentHostPlatform() == HostPlatform.windows_x64) {
+      supportsAppJit = false;
+      printStatus('Android x64 dynamic build on Windows x64 will use purely interpreted '
+                  'code for now (see  https://github.com/flutter/flutter/issues/17489).');
+    }
+
+    if (platform == TargetPlatform.android_x86) {
+      supportsAppJit = false;
+      printStatus('Android x86 dynamic build will use purely interpreted code for now. '
+                  'To optimize performance, consider using --target-platform=android-x64.');
+    }
+
     genSnapshotArgs.addAll(<String>[
-      '--snapshot_kind=app-jit',
+      '--snapshot_kind=${supportsAppJit ? 'app-jit' : 'app'}',
       '--load_compilation_trace=$compilationTraceFilePath',
       '--load_vm_snapshot_data=$engineVmSnapshotData',
       '--load_isolate_snapshot_data=$engineIsolateSnapshotData',
@@ -533,6 +550,8 @@ class JITSnapshotter {
     return const <TargetPlatform>[
       TargetPlatform.android_arm,
       TargetPlatform.android_arm64,
+      TargetPlatform.android_x86,
+      TargetPlatform.android_x64,
     ].contains(platform);
   }
 }

packages/flutter_tools/lib/src/build_info.dart

@@ -153,7 +153,11 @@ bool isAotBuildMode(BuildMode mode) {
 }
 
 // Returns true if the given build mode can be used on emulators / simulators.
-bool isEmulatorBuildMode(BuildMode mode) => mode == BuildMode.debug;
+bool isEmulatorBuildMode(BuildMode mode) {
+  return mode == BuildMode.debug ||
+    mode == BuildMode.dynamicRelease ||
+    mode == BuildMode.dynamicProfile;
+}
 
 enum HostPlatform {
   darwin_x64,

packages/flutter_tools/lib/src/commands/build_apk.dart

@@ -28,7 +28,7 @@ class BuildApkCommand extends BuildSubCommand {
       )
       ..addOption('target-platform',
         defaultsTo: 'android-arm',
-        allowed: <String>['android-arm', 'android-arm64']);
+        allowed: <String>['android-arm', 'android-arm64', 'android-x86', 'android-x64']);
   }
 
   @override

packages/flutter_tools/lib/src/commands/build_bundle.dart

@@ -30,7 +30,7 @@ class BuildBundleCommand extends BuildSubCommand {
       ..addOption('depfile', defaultsTo: defaultDepfilePath)
       ..addOption('target-platform',
         defaultsTo: 'android-arm',
-        allowed: <String>['android-arm', 'android-arm64', 'ios']
+        allowed: <String>['android-arm', 'android-arm64', 'android-x86', 'android-x64', 'ios']
       )
       ..addFlag('track-widget-creation',
         hide: !verboseHelp,

packages/flutter_tools/lib/src/commands/run.dart

@@ -49,7 +49,7 @@ abstract class RunCommandBase extends FlutterCommand {
       )
       ..addOption('target-platform',
         defaultsTo: 'default',
-        allowed: <String>['default', 'android-arm', 'android-arm64'],
+        allowed: <String>['default', 'android-arm', 'android-arm64', 'android-x86', 'android-x64'],
         help: 'Specify the target platform when building the app for an '
               'Android device.\nIgnored on iOS.');
     usesTargetOption();