Return Result to fail gracefully instead of aborting

Summary:
- Make TensorInfo static factory pattern to allow returning Result.
- Return Result type to fail gracefully instead of directly aborting in the runtime.

Differential Revision: D78187751

Author: lucylq

runtime/executor/method_meta.cpp

@@ -52,7 +52,7 @@ Result<Tag> get_tag(
   }
 }
 
-size_t calculate_nbytes(
+Result<size_t> calculate_nbytes(
     Span<const int32_t> sizes,
     executorch::aten::ScalarType scalar_type) {
   size_t n = 1;
@@ -61,7 +61,13 @@ size_t calculate_nbytes(
     prev_n = n;
     n *= sizes[i];
     // Check for overflow
-    ET_CHECK(sizes[i] == 0 || n / sizes[i] == prev_n);
+    ET_CHECK_OR_RETURN_ERROR(
+        sizes[i] == 0 || n / sizes[i] == prev_n,
+        InvalidArgument,
+        "Invalid size[%zu]: %d. Potentially overflowed, expect to be 0 or prev_n: %zu",
+        i,
+        sizes[i],
+        prev_n);
   }
 
   size_t elem_size = executorch::runtime::elementSize(scalar_type);
@@ -70,25 +76,47 @@ size_t calculate_nbytes(
   n = n * elem_size;
 
   // Check for overflow
-  ET_CHECK(elem_size == 0 || n / elem_size == prev_n);
+  ET_CHECK_OR_RETURN_ERROR(
+      elem_size == 0 || n / elem_size == prev_n,
+      InvalidArgument,
+      "Invalid elem_size: %zu. Potentially overflowed, expect to be 0 or prev_n: %zu",
+      elem_size,
+      prev_n);
 
   return n;
 }
 
 } // namespace
 
+/*static*/ Result<TensorInfo> TensorInfo::create(
+    Span<const int32_t> sizes,
+    Span<const uint8_t> dim_order,
+    executorch::aten::ScalarType scalar_type,
+    const bool is_memory_planned,
+    std::string_view name) {
+  auto nbytes = calculate_nbytes(sizes, scalar_type);
+  ET_CHECK_OR_RETURN_ERROR(
+      nbytes.ok(),
+      InvalidArgument,
+      "Failed to calculate nbytes for TensorInfo");
+
+  return TensorInfo(
+      sizes, dim_order, scalar_type, is_memory_planned, name, nbytes.get());
+}
+
 TensorInfo::TensorInfo(
     Span<const int32_t> sizes,
     Span<const uint8_t> dim_order,
     executorch::aten::ScalarType scalar_type,
     const bool is_memory_planned,
-    std::string_view name)
+    std::string_view name,
+    size_t nbytes)
     : sizes_(sizes),
       dim_order_(dim_order),
       name_(name),
       scalar_type_(scalar_type),
       is_memory_planned_(is_memory_planned),
-      nbytes_(calculate_nbytes(sizes_, scalar_type_)) {}
+      nbytes_(nbytes) {}
 
 Span<const int32_t> TensorInfo::sizes() const {
   return sizes_;
@@ -160,7 +188,7 @@ Result<TensorInfo> MethodMeta::input_tensor_meta(size_t index) const {
   auto input_index = s_plan_->inputs()->Get(index);
   // input_index was already validated by input_tag().
   auto tensor_value = s_plan_->values()->Get(input_index)->val_as_Tensor();
-  return TensorInfo(
+  return TensorInfo::create(
       Span<const int32_t>(
           tensor_value->sizes()->data(), tensor_value->sizes()->size()),
       Span<const uint8_t>(
@@ -212,7 +240,7 @@ Result<TensorInfo> MethodMeta::output_tensor_meta(size_t index) const {
   // output_index was already validated by output_tag().
   auto tensor_value = s_plan_->values()->Get(output_index)->val_as_Tensor();
 
-  return TensorInfo(
+  return TensorInfo::create(
       Span<const int32_t>(
           tensor_value->sizes()->data(), tensor_value->sizes()->size()),
       Span<const uint8_t>(
@@ -255,7 +283,7 @@ Result<TensorInfo> MethodMeta::attribute_tensor_meta(size_t index) const {
           auto t_name =
               tensor_value->extra_tensor_info()->fully_qualified_name();
           // Count constant returns as memory planned
-          return TensorInfo(
+          return TensorInfo::create(
               Span<const int32_t>(
                   tensor_value->sizes()->data(), tensor_value->sizes()->size()),
               Span<const uint8_t>(

runtime/executor/method_meta.h

@@ -77,13 +77,32 @@ class TensorInfo final {
   friend class MethodMeta;
   friend class testing::TensorInfoTestFriend;
 
-  TensorInfo(
+  /**
+   * Create a TensorInfo instance.
+   *
+   * @param[in] sizes The sizes of the tensor.
+   * @param[in] dim_order The dim order of the tensor.
+   * @param[in] scalar_type The scalar type of the tensor.
+   * @param[in] is_memory_planned Whether the tensor's memory was planned.
+   * @param[in] name The fully qualified name of the tensor.
+   * @returns A Result containing the TensorInfo on success, or an error on
+   * failure.
+   */
+  static Result<TensorInfo> create(
       Span<const int32_t> sizes,
       Span<const uint8_t> dim_order,
       executorch::aten::ScalarType scalar_type,
       const bool is_memory_planned,
       std::string_view name);
 
+  TensorInfo(
+      Span<const int32_t> sizes,
+      Span<const uint8_t> dim_order,
+      executorch::aten::ScalarType scalar_type,
+      const bool is_memory_planned,
+      std::string_view name,
+      size_t nbytes);
+
   /**
    * The sizes of the tensor.
    *