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dart:ffi asFunction / lookupFunction static function vs instance method #35903

dcharkes opened this Issue Feb 11, 2019 · 0 comments


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dcharkes commented Feb 11, 2019

Currently Pointer.asFunction and DynamicLibrary.lookup are instance methods.
However, this enables users to call these dynamically.

Pointer<Int8 Function(Int8)> p = fromAddress(memoryAddress);
dynamic q = p;
int Function(int) f = q.asFunction();

Unfortunately we cannot at compile-time discover this, which means that we cannot generate trampolines in AOT mode.

We have two possible solutions:

  1. throw a runtime exception on a dynamic invocation
  2. make these functions static: f = asFunction(q)

The second option is a bit less ergonomic, but safer.

@dcharkes dcharkes added this to To do in Dart VM FFI via automation Feb 11, 2019

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