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[ffigen] Crash when a struct member or typedef is a pointer to a function with an unsupported parameter type #3691
Description
ffigen throws an unhandled exception during code generation when a struct
member or a typedef is a pointer to a function whose parameters include a
type ffigen cannot represent (a C++ reference here). The unsupported type is
detected for functions and for direct function-pointer fields, but not when
the function pointer is reached through a typedef.
Repro
repro.h
struct Widget;
typedef void (*callback)(int, Widget&, int);
struct Holder {
callback fn;
};repro.dart
import 'package:ffigen/ffigen.dart';
void main() async {
await FfiGenerator(
output: Output(dart: DartOutput(path: Uri.file('repro_bindings.dart'))),
input: Input(
entryPoints: [Uri.file('repro.h')],
compilerOptions: ['-x', 'c++'],
),
visitors: [
Visitor(struct: (node) => node.isIncluded = true),
],
).generate();
}Actual
Unhandled exception:
Unsupported operation: No mapping for type: (Unimplemented: Function parameter has an unsupported type.)
#0 Type.getCType (package:ffigen/src/code_generator/type.dart:52:7)
#1 PointerType.getCType (package:ffigen/src/code_generator/pointer.dart:32:58)
#2 Type.getFfiDartType (package:ffigen/src/code_generator/type.dart:56:45)
#3 Typealias.getFfiDartType (package:ffigen/src/code_generator/typealias.dart:167:17)
#4 Compound.toBindingString (package:ffigen/src/code_generator/compound.dart:200:38)
#5 Writer.generate (package:ffigen/src/code_generator/writer.dart:162:17)
Including the typedef instead of the struct, with
Visitor(typealias: (node) => node.isIncluded = TypealiasInclude.always),
crashes the same way from Typealias.toBindingString.
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