[dart2wasm] Add support for dynamic module options.

Usage of these flags will be added in subsequent changes but having them checked in unblocks adding references to them from the testing infrastructure.

Change-Id: I336f06f57752fac5c19cb2c1c3db623edaef79b5
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/400902
Reviewed-by: Martin Kustermann <[email protected]>
Commit-Queue: Nate Biggs <[email protected]>

Author: natebiggs

pkg/dart2wasm/lib/compiler_options.dart

@@ -16,6 +16,9 @@ class WasmCompilerOptions {
   String outputFile;
   String? depFile;
   String? outputJSRuntimeFile;
+  Uri? dynamicModuleMainUri;
+  Uri? dynamicInterfaceUri;
+  Uri? dynamicModuleMetadataFile;
   Map<String, String> environment = {};
   Map<fe.ExperimentalFlag, bool> feExperimentalFlags = const {};
   String? multiRootScheme;

pkg/dart2wasm/lib/dart2wasm.dart

@@ -102,6 +102,23 @@ final List<Option> options = [
   Flag("enable-multi-module-stress-test-mode",
       (o, value) => o.translatorOptions.enableMultiModuleStressTestMode = value,
       defaultsTo: _d.translatorOptions.enableMultiModuleStressTestMode),
+  // Flags for dynamic modules
+  // The modified dill file produced by the main module compilation for dynamic
+  // modules. Providing this and not "dynamic-module-interface" indicates that
+  // this is a compilation of a dynamic module. The dill will contain the AST
+  // for the main module as well as some annotations to help identify entities
+  // when compiling dynamic modules.
+  UriOption(
+      "dynamic-module-main", (o, value) => o.dynamicModuleMainUri = value),
+  // A yaml file describing the interface of the main module accessible from
+  // dynamic modules. Providing this indicates to the dart2wasm that the module
+  // produced should support dynamic modules.
+  UriOption(
+      "dynamic-module-interface", (o, value) => o.dynamicInterfaceUri = value),
+  // A binary metadata file produced by the main module compilation for dynamic
+  // modules.
+  UriOption("dynamic-module-metadata",
+      (o, value) => o.dynamicModuleMetadataFile = value),
 ];
 
 Map<fe.ExperimentalFlag, bool> processFeExperimentalFlags(
@@ -116,7 +133,8 @@ Map<String, String> processEnvironment(List<String> defines) =>
       if (index == -1) {
         throw ArgumentError('Bad define string: $d');
       }
-      return MapEntry<String, String>(d.substring(0, index), d.substring(index + 1));
+      return MapEntry<String, String>(
+          d.substring(0, index), d.substring(index + 1));
     }));
 
 WasmCompilerOptions parseArguments(List<String> arguments) {