Frame tests for loading shared objects and fetching symbol address

Author: anutosh491

lib/Interpreter/CppInterOpInterpreter.h

@@ -412,6 +412,18 @@ class Interpreter {
   }
 
   CompilationResult loadLibrary(const std::string& filename, bool lookup) {
+#ifdef __EMSCRIPTEN__
+    if (lookup) {
+      llvm::errs() << "[cppinterop] Warning: 'lookup' has no effect on WASM.\n";
+    }
+    // In WASM: directly use Interpreter's LoadDynamicLibrary
+    if (auto Err = inner->LoadDynamicLibrary(filename.c_str())) {
+      llvm::logAllUnhandledErrors(std::move(Err), llvm::errs(),
+                                  "loadLibrary: ");
+      return kFailure;
+    }
+    return kSuccess;
+#endif
     DynamicLibraryManager* DLM = getDynamicLibraryManager();
     std::string canonicalLib;
     if (lookup)

unittests/CppInterOp/CMakeLists.txt

@@ -97,6 +97,7 @@ if(EMSCRIPTEN)
     PUBLIC "SHELL: -s STACK_SIZE=32mb"
     PUBLIC "SHELL: -s INITIAL_MEMORY=128mb"
     PUBLIC "SHELL: --preload-file ${SYSROOT_PATH}/include@/include"
+    PUBLIC "SHELL: --preload-file ${CMAKE_CURRENT_BINARY_DIR}/TestSharedLib/unittests/bin/Release/libTestSharedLib.so@/libTestSharedLib.so"
   )
 endif()
 

unittests/CppInterOp/DynamicLibraryManagerTest.cpp

@@ -57,3 +57,25 @@ TEST(DynamicLibraryManagerTest, Sanity) {
   // invalidated...
   // EXPECT_FALSE(Cpp::GetFunctionAddress("ret_zero"));
 }
+
+TEST(DynamicLibraryManagerTest, BasicSymbolLookup) {
+#ifndef EMSCRIPTEN
+  GTEST_SKIP() << "This test is only intended for Emscripten builds.";
+#endif
+
+  ASSERT_TRUE(Cpp::CreateInterpreter());
+  EXPECT_FALSE(Cpp::GetFunctionAddress("ret_zero"));
+
+  // Load the library manually. Use known preload path (MEMFS path)
+  const char* wasmLibPath = "libTestSharedLib.so";  // Preloaded path in MEMFS
+  EXPECT_TRUE(Cpp::LoadLibrary(wasmLibPath, false));
+
+  Cpp::Process("");
+
+  void* Addr = Cpp::GetFunctionAddress("ret_zero");
+  EXPECT_NE(Addr, nullptr) << "Symbol 'ret_zero' not found after dlopen.";
+
+  using RetZeroFn = int (*)();
+  auto Fn = reinterpret_cast<RetZeroFn>(Addr);
+  EXPECT_EQ(Fn(), 0);
+}