[Mlir-commits] [mlir] [MLIR] Add a BlobAttr interface for attribute to wrap arbitrary content and use it as linkLibs for ModuleToObject (PR #120116)

[Fabian Mora]

================
@@ -89,22 +92,51 @@ ModuleToObject::loadBitcodeFile(llvm::LLVMContext &context, StringRef path) {
 }
 
 LogicalResult ModuleToObject::loadBitcodeFilesFromList(
-    llvm::LLVMContext &context, ArrayRef<std::string> fileList,
+    llvm::LLVMContext &context, ArrayRef<Attribute> librariesToLink,
     SmallVector<std::unique_ptr<llvm::Module>> &llvmModules,
     bool failureOnError) {
-  for (const std::string &str : fileList) {
-    // Test if the path exists, if it doesn't abort.
-    StringRef pathRef = StringRef(str.data(), str.size());
-    if (!llvm::sys::fs::is_regular_file(pathRef)) {
+  for (Attribute linkLib : librariesToLink) {
+    // Attributes in this list can be either list of file paths using
+    // StringAttr, or a resource attribute pointing to the LLVM bitcode in
+    // memory.
+    if (auto filePath = dyn_cast<StringAttr>(linkLib)) {
+      // Test if the path exists, if it doesn't abort.
+      if (!llvm::sys::fs::is_regular_file(filePath.strref())) {
+        getOperation().emitError()
+            << "File path: " << filePath << " does not exist or is not a file.";
+        return failure();
+      }
+      // Load the file or abort on error.
+      if (auto bcFile = loadBitcodeFile(context, filePath))
+        llvmModules.push_back(std::move(bcFile));
+      else if (failureOnError)
+        return failure();
+      continue;
+    }
+    if (auto blobAttr = dyn_cast<BlobAttr>(linkLib)) {
+      // Load the file or abort on error.
+      llvm::SMDiagnostic error;
+      ArrayRef<char> data = blobAttr.getData();
+      std::unique_ptr<llvm::MemoryBuffer> buffer =
+          llvm::MemoryBuffer::getMemBuffer(StringRef(data.data(), data.size()),
+                                           "blobLinkedLib",
+                                           /*RequiresNullTerminator=*/false);
+      std::unique_ptr<llvm::Module> mod =
+          getLazyIRModule(std::move(buffer), error, context);
+      if (mod) {
+        llvmModules.push_back(std::move(mod));
----------------
fabianmcg wrote:

Also, there should be a call to `handleBitcodeFile`.

https://github.com/llvm/llvm-project/pull/120116