inline the trivial int conversion functions in the code generator

PiperOrigin-RevId: 486670074

upb/msg_internal.h

@@ -51,18 +51,6 @@
 extern "C" {
 #endif
 
-/** upb_*Int* conversion routines ********************************************/
-
-UPB_INLINE int32_t _upb_Int32_FromI(int v) { return (int32_t)v; }
-
-UPB_INLINE int64_t _upb_Int64_FromLL(long long v) { return (int64_t)v; }
-
-UPB_INLINE uint32_t _upb_UInt32_FromU(unsigned v) { return (uint32_t)v; }
-
-UPB_INLINE uint64_t _upb_UInt64_FromULL(unsigned long long v) {
-  return (uint64_t)v;
-}
-
 extern const float kUpb_FltInfinity;
 extern const double kUpb_Infinity;
 
@@ -93,7 +81,7 @@ typedef enum {
 // Mask to isolate the upb_FieldMode from field.mode.
 #define kUpb_FieldMode_Mask 3
 
-/* Extra flags on the mode field. */
+// Extra flags on the mode field.
 typedef enum {
   kUpb_LabelFlags_IsPacked = 4,
   kUpb_LabelFlags_IsExtension = 8,

upbc/protoc-gen-upb.cc

@@ -219,17 +219,13 @@ std::string FieldDefault(const protobuf::FieldDescriptor* field) {
       return absl::Substitute("upb_StringView_FromString(\"$0\")",
                               absl::CEscape(field->default_value_string()));
     case protobuf::FieldDescriptor::CPPTYPE_INT32:
-      return absl::Substitute("_upb_Int32_FromI($0)",
-                              field->default_value_int32());
+      return absl::Substitute("(int32_t)$0", field->default_value_int32());
     case protobuf::FieldDescriptor::CPPTYPE_INT64:
-      return absl::Substitute("_upb_Int64_FromLL($0ll)",
-                              field->default_value_int64());
+      return absl::Substitute("(int64_t)$0ll", field->default_value_int64());
     case protobuf::FieldDescriptor::CPPTYPE_UINT32:
-      return absl::Substitute("_upb_UInt32_FromU($0u)",
-                              field->default_value_uint32());
+      return absl::Substitute("(uint32_t)$0u", field->default_value_uint32());
     case protobuf::FieldDescriptor::CPPTYPE_UINT64:
-      return absl::Substitute("_upb_UInt64_FromULL($0ull)",
-                              field->default_value_uint64());
+      return absl::Substitute("(uint64_t)$0ull", field->default_value_uint64());
     case protobuf::FieldDescriptor::CPPTYPE_FLOAT:
       return FloatToCLiteral(field->default_value_float());
     case protobuf::FieldDescriptor::CPPTYPE_DOUBLE: