Add Module load API.

Summary: #8363

Reviewed By: mergennachin

Differential Revision: D71916550

Author: shoumikhin

extension/apple/ExecuTorch/Exported/ExecuTorchModule.h

@@ -22,6 +22,16 @@ typedef NS_ENUM(NSInteger, ExecuTorchModuleLoadMode) {
   ExecuTorchModuleLoadModeMmapUseMlockIgnoreErrors,
 } NS_SWIFT_NAME(ModuleLoadMode);
 
+/**
+ * Enum to define the verification level used when loading a module.
+ * Values can be a subset, but must numerically match exactly those defined in
+ * runtime/executor/program.h
+ */
+typedef NS_ENUM(uint8_t, ExecuTorchVerification) {
+    ExecuTorchVerificationMinimal,
+    ExecuTorchVerificationInternalConsistency,
+} NS_SWIFT_NAME(ModuleVerification);
+
 /**
  * Represents a module that encapsulates an ExecuTorch program.
  * This class is a facade for loading programs and executing methods within them.
@@ -49,6 +59,33 @@ __attribute__((deprecated("This API is experimental.")))
  */
 - (instancetype)initWithFilePath:(NSString *)filePath;
 
+/**
+ * Loads the module’s program using the specified verification level.
+ *
+ * @param verification The verification level to apply when loading the program.
+ * @param error A pointer to an NSError pointer that will be set if an error occurs.
+ * @return YES if the program was successfully loaded; otherwise, NO.
+ */
+- (BOOL)loadWithVerification:(ExecuTorchVerification)verification
+                       error:(NSError **)error;
+
+/**
+ * Loads the module’s program using minimal verification.
+ *
+ * This is a convenience overload that defaults the verification level to Minimal.
+ *
+ * @param error A pointer to an NSError pointer that will be set if an error occurs.
+ * @return YES if the program was successfully loaded; otherwise, NO.
+ */
+- (BOOL)load:(NSError **)error;
+
+/**
+ * Checks if the module is loaded.
+ *
+ * @return YES if the module's program is loaded; otherwise, NO.
+ */
+- (BOOL)isLoaded;
+
 + (instancetype)new NS_UNAVAILABLE;
 - (instancetype)init NS_UNAVAILABLE;
 

extension/apple/ExecuTorch/Exported/ExecuTorchModule.mm

@@ -14,6 +14,7 @@
 #import <executorch/extension/tensor/tensor.h>
 
 using namespace executorch::extension;
+using namespace executorch::runtime;
 
 @implementation ExecuTorchModule {
   std::unique_ptr<Module> _module;
@@ -35,4 +36,27 @@ - (instancetype)initWithFilePath:(NSString *)filePath {
   return [self initWithFilePath:filePath loadMode:ExecuTorchModuleLoadModeFile];
 }
 
+- (BOOL)loadWithVerification:(ExecuTorchVerification)verification
+                       error:(NSError **)error {
+  const auto errorCode = _module->load(static_cast<Program::Verification>(verification));
+  if (errorCode != Error::Ok) {
+    if (error) {
+      *error = [NSError errorWithDomain:ExecuTorchErrorDomain
+                                   code:(NSInteger)errorCode
+                               userInfo:nil];
+    }
+    return NO;
+  }
+  return YES;
+}
+
+- (BOOL)load:(NSError **)error {
+  return [self loadWithVerification:ExecuTorchVerificationMinimal
+                              error:error];
+}
+
+- (BOOL)isLoaded {
+  return _module->is_loaded();
+}
+
 @end

extension/apple/ExecuTorch/__tests__/ModuleTest.swift

@@ -18,11 +18,14 @@ class ModuleTest: XCTestCase {
     return Bundle(for: type(of: self))
 #endif
   }
-  
-  func test() throws {
+
+  func testLoad() {
     guard let modelPath = resourceBundle.path(forResource: "add", ofType: "pte") else {
       XCTFail("Couldn't find the model file")
       return
     }
+    let module = Module(filePath: modelPath)
+    XCTAssertNoThrow(try module.load())
+    XCTAssertTrue(module.isLoaded())
   }
 }