Fix Objective-C static analysis build (#18606)

- Patch abseil to fix a compile error about not finding `cxxabi.h`.
- Fix some static analysis warnings.

cmake/patches/abseil/absl_gh_issue_1435_workaround.patch

@@ -0,0 +1,17 @@
+--- absl/container/internal/layout.h	2023-11-28 09:35:48
++++ absl/container/internal/layout.updated.h	2023-11-28 10:13:14
+@@ -181,9 +181,11 @@
+ #include <sanitizer/asan_interface.h>
+ #endif
+ 
+-#if defined(__GXX_RTTI)
+-#define ABSL_INTERNAL_HAS_CXA_DEMANGLE
+-#endif
++// Comment out ABSL_INTERNAL_HAS_CXA_DEMANGLE definition to work around this issue:
++// https://github.com/abseil/abseil-cpp/issues/1435
++// #if defined(__GXX_RTTI)
++// #define ABSL_INTERNAL_HAS_CXA_DEMANGLE
++// #endif
+ 
+ #ifdef ABSL_INTERNAL_HAS_CXA_DEMANGLE
+ #include <cxxabi.h>

include/onnxruntime/core/graph/graph.h

@@ -668,7 +668,7 @@ class Node {
 The Graph representation containing the graph inputs and outputs, the Node instances,
 and the edges connecting the nodes.
 */
-class Graph {
+class Graph {  // NOLINT(clang-analyzer-optin.performance.Padding): preserve existing data member order for readability
  public:
   /** Gets the Graph name. */
   const std::string& Name() const noexcept;

onnxruntime/core/providers/coreml/model/model.mm

@@ -32,6 +32,13 @@ using namespace onnxruntime;
 using namespace onnxruntime::coreml;
 
 namespace {
+// Converts a UTF8 const char* to an NSString. Throws on failure.
+NSString* _Nonnull Utf8StringToNSString(const char* utf8_str) {
+  NSString* result = [NSString stringWithUTF8String:utf8_str];
+  ORT_ENFORCE(result != nil, "NSString conversion failed.");
+  return result;
+}
+
 /**
  * Computes the static output shape used to allocate the output tensor.
  * `inferred_shape` is the inferred shape known at model compile time. It may contain dynamic dimensions (-1).
@@ -152,19 +159,20 @@ Status CreateInputFeatureProvider(const std::unordered_map<std::string, OnnxTens
                                                               deallocator:^(void* /* bytes */) {
                                                               }
                                                                     error:&error];
-    ORT_RETURN_IF(error != nil,
+    ORT_RETURN_IF(multi_array == nil,
                   "Failed to create MLMultiArray for feature: ", name,
-                  ", error: ", [[error localizedDescription] UTF8String]);
+                  (error != nil) ? MakeString(", error: ", [[error localizedDescription] UTF8String]) : "");
 
     MLFeatureValue* feature_value = [MLFeatureValue featureValueWithMultiArray:multi_array];
-    NSString* feature_name = [NSString stringWithUTF8String:name.c_str()];
+    NSString* feature_name = Utf8StringToNSString(name.c_str());
     feature_dictionary[feature_name] = feature_value;
   }
 
   auto* feature_provider = [[MLDictionaryFeatureProvider alloc] initWithDictionary:feature_dictionary
                                                                              error:&error];
-  ORT_RETURN_IF(error != nil,
-                "Failed to create MLDictionaryFeatureProvider, error: ", [[error localizedDescription] UTF8String]);
+  ORT_RETURN_IF(feature_provider == nil,
+                "Failed to create MLDictionaryFeatureProvider",
+                (error != nil) ? MakeString(", error: ", [[error localizedDescription] UTF8String]) : "");
 
   *feature_provider_out = feature_provider;
   conversion_buffers_out = std::move(conversion_buffers);
@@ -251,7 +259,7 @@ NS_ASSUME_NONNULL_BEGIN
                               get_output_tensor_mutable_raw_data_fn
     API_AVAILABLE_OS_VERSIONS;
 
-@property MLModel* model API_AVAILABLE_OS_VERSIONS;
+@property(nullable) MLModel* model API_AVAILABLE_OS_VERSIONS;
 
 @end
 
@@ -297,12 +305,15 @@ NS_ASSUME_NONNULL_BEGIN
 - (Status)loadModel {
   NSError* error = nil;
   NSURL* modelUrl = [NSURL URLWithString:coreml_model_path_];
-  NSAssert(modelUrl != nil, @"modelUrl must not be nil");
+  if (modelUrl == nil) {
+    return ORT_MAKE_STATUS(ONNXRUNTIME, FAIL, "Failed to create model URL from path");
+  }
+
   NSURL* compileUrl = [MLModel compileModelAtURL:modelUrl error:&error];
 
   if (error != nil) {
-    return ORT_MAKE_STATUS(ONNXRUNTIME, FAIL, "Error compiling model ",
-                           [[error localizedDescription] cStringUsingEncoding:NSUTF8StringEncoding]);
+    return ORT_MAKE_STATUS(ONNXRUNTIME, FAIL, "Error compiling model: ",
+                           [[error localizedDescription] UTF8String]);
   }
 
   compiled_model_path_ = [compileUrl path];
@@ -313,9 +324,9 @@ NS_ASSUME_NONNULL_BEGIN
                             : MLComputeUnitsAll;
   _model = [MLModel modelWithContentsOfURL:compileUrl configuration:config error:&error];
 
-  if (error != NULL) {
-    return ORT_MAKE_STATUS(ONNXRUNTIME, FAIL, "Error Creating MLModel ",
-                           [[error localizedDescription] cStringUsingEncoding:NSUTF8StringEncoding]);
+  if (_model == nil) {
+    return ORT_MAKE_STATUS(ONNXRUNTIME, FAIL, "Failed to create MLModel",
+                           (error != nil) ? MakeString(", error: ", [[error localizedDescription] UTF8String]) : "");
   }
 
   return Status::OK();
@@ -327,7 +338,7 @@ NS_ASSUME_NONNULL_BEGIN
   Status status = Status::OK();
   ORT_TRY {
     if (_model == nil) {
-      return ORT_MAKE_STATUS(ONNXRUNTIME, FAIL, "model is not loaded");
+      return ORT_MAKE_STATUS(ONNXRUNTIME, FAIL, "Model is not loaded");
     }
 
     id<MLFeatureProvider> input_features;
@@ -342,12 +353,12 @@ NS_ASSUME_NONNULL_BEGIN
 
     if (error != nil) {
       return ORT_MAKE_STATUS(ONNXRUNTIME, FAIL, "Error executing model: ",
-                             [[error localizedDescription] cStringUsingEncoding:NSUTF8StringEncoding]);
+                             [[error localizedDescription] UTF8String]);
     }
 
     for (const auto& [output_name, output_tensor_info] : outputs) {
       MLFeatureValue* output_value =
-          [output_features featureValueForName:[NSString stringWithUTF8String:output_name.c_str()]];
+          [output_features featureValueForName:Utf8StringToNSString(output_name.c_str())];
 
       if (output_value == nil) {
         return ORT_MAKE_STATUS(ONNXRUNTIME, FAIL, "output_features has no value for ", output_name);
@@ -452,7 +463,7 @@ Status Execution::LoadModel() {
     return status;
   }
 
-  return ORT_MAKE_STATUS(ONNXRUNTIME, FAIL, "Execution::LoadModel requires macos 10.15+ or ios 13+ ");
+  return ORT_MAKE_STATUS(ONNXRUNTIME, FAIL, "Execution::LoadModel requires macos 10.15+ or ios 13+");
 }
 
 Status Execution::Predict(const std::unordered_map<std::string, OnnxTensorData>& inputs,
@@ -468,7 +479,7 @@ Status Execution::Predict(const std::unordered_map<std::string, OnnxTensorData>&
     }
   }
 
-  return ORT_MAKE_STATUS(ONNXRUNTIME, FAIL, "Execution::LoadModel requires macos 10.15+ or ios 13+ ");
+  return ORT_MAKE_STATUS(ONNXRUNTIME, FAIL, "Execution::Predict requires macos 10.15+ or ios 13+");
 }
 
 Model::Model(const std::string& path, const logging::Logger& logger, uint32_t coreml_flags)

tools/ci_build/github/azure-pipelines/mac-objc-static-analysis-ci-pipeline.yml

@@ -29,6 +29,11 @@ jobs:
         --build --parallel --target onnx_proto
     displayName: Generate compile_commands.json and ONNX protobuf files
 
+  - script: |
+      patch < "$(Build.SourcesDirectory)/cmake/patches/abseil/absl_gh_issue_1435_workaround.patch"
+    workingDirectory: "$(Build.BinariesDirectory)/Debug/_deps/abseil_cpp-src"
+    displayName: Apply absl_gh_issue_1435_workaround.patch
+
   - script: |
       set -e