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workingjubilee avatar workingjubilee commented on August 30, 2024 2

Reduction, still using the jni crate so far so it's only dubiously minimal:

use core::ptr;
use jni::{objects as obj, JNIEnv};

fn get_jvm_arguments(mut env: JNIEnv) -> Vec<String> {
    let beany_beans = unsafe { obj::JObject::from_raw(ptr::null_mut()) };
    let inputty_inputs = unsafe { obj::JMethodID::from_raw(ptr::null_mut()) };
    let arguable_args = env.call_static_method(beany_beans, inputty_inputs, "", &[]);

    vec![]
}
error: internal compiler error: compiler/rustc_infer/src/infer/at.rs:400:21: relating different kinds: jni::objects::JObject<'?15> '?4

thread 'rustc' panicked at compiler/rustc_infer/src/infer/at.rs:400:21:
Box<dyn Any>

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TsubakiDev avatar TsubakiDev commented on August 30, 2024 1

Thanks for the update, could you add the setup for how to get env? (A self-contained main function would be best).

Looks like @lcnr authored that code and might have an idea

I have completed the method to get env. Since JNI_OnLoad is called when loading native from Java, there should be no way to get env from the main function.

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workingjubilee avatar workingjubilee commented on August 30, 2024 1

Oh, pfft, I forgot to actually run it against nightly.

It doesn't ICE then. Already fixed.

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tgross35 avatar tgross35 commented on August 30, 2024

A minimal reproduction would help here. Could you try deleting a lot of that code and see what the minimum is to get it to crash? Also, what version of jni are you on?

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TsubakiDev avatar TsubakiDev commented on August 30, 2024

A minimal reproduction would help here. Could you try deleting a lot of that code and see what the minimum is to get it to crash? Also, what version of jni are you on?

The version of jni is 0.21.1, i will later reduce the code to perform a minimal reproduction

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TsubakiDev avatar TsubakiDev commented on August 30, 2024

A minimal reproduction would help here. Could you try deleting a lot of that code and see what the minimum is to get it to crash? Also, what version of jni are you on?

Here is the minimal reproducible code. When I remove input_arguments, it becomes compilable.

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tgross35 avatar tgross35 commented on August 30, 2024

Thanks for the update, could you add the setup for how to get env? (A self-contained main function would be best).

Looks like @lcnr authored that code and might have an idea

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workingjubilee avatar workingjubilee commented on August 30, 2024

The source is a cdylib so a lib.rs that compiles would be fine.

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TsubakiDev avatar TsubakiDev commented on August 30, 2024

Sorry, my vscode autosave is a bit slow, which caused me to make a wrong judgment. It should be the execution of input_arguments that caused the error

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workingjubilee avatar workingjubilee commented on August 30, 2024
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workingjubilee avatar workingjubilee commented on August 30, 2024

I tried to do the "assemble a minimal repro from the bottom up" way, but it's too easily inferred if you don't impl enough of the crate, so it probably has to be done by pasting the crate in and cutting it down instead.

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lcnr avatar lcnr commented on August 30, 2024

this looks like a bug in our linting/error reporting infrastructure (see the report_similar_impl_candidates in the backtrace). I feel fairly confident that I should be able to diagnose this error without a minimization if someone posts a detailed backtrace with debug-info and line numbers

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workingjubilee avatar workingjubilee commented on August 30, 2024

The original gets this error:

   Compiling jni-example v0.1.0 (/home/jubilee/rust/jni-example)
error[E0277]: the trait bound `JObject<'_>: Desc<'_, JClass<'_>>` is not satisfied
    --> src/lib.rs:44:13
     |
43   |         .call_static_method(
     |          ------------------ required by a bound introduced by this call
44   |             runtime_mxbean,
     |             ^^^^^^^^^^^^^^ the trait `AsRef<str>` is not implemented for `JObject<'_>`, which is required by `JObject<'_>: Desc<'_, JClass<'_>>`
     |
     = help: the trait `AsRef<JObject<'_>>` is implemented for `JObject<'_>`
     = help: for that trait implementation, expected `JObject<'_>`, found `str`
     = note: required for `JNIString` to implement `From<JObject<'_>>`
     = note: required for `JObject<'_>` to implement `Into<JNIString>`
     = note: required for `JObject<'_>` to implement `Desc<'_, JClass<'_>>`
note: required by a bound in `JNIEnv::<'local>::call_static_method`
    --> /home/jubilee/.cargo/registry/src/index.crates.io-6f17d22bba15001f/jni-0.21.1/src/wrapper/jnienv.rs:1424:12
     |
1416 |     pub fn call_static_method<'other_local, T, U, V>(
     |            ------------------ required by a bound in this associated function
...
1424 |         T: Desc<'local, JClass<'other_local>>,
     |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `JNIEnv::<'local>::call_static_method`

warning: unused variable: `env`
 --> src/lib.rs:7:9
  |
7 |     let env = vm
  |         ^^^ help: if this is intentional, prefix it with an underscore: `_env`
  |
  = note: `#[warn(unused_variables)]` on by default

For more information about this error, try `rustc --explain E0277`.
warning: `jni-example` (lib) generated 1 warning
error: could not compile `jni-example` (lib) due to 1 previous error; 1 warning emitted

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