array::rb_ary_new() Segfaults.

[wshatch]

Originally d-unsed/ruru#33.

Currently, creating a new ruby array segfaults.

extern crate ruby_sys;
use ruby_sys::array;

fn main() {
  unsafe {
    let foo = array::rb_ary_new();
  }
}

Here's the result of cargo run --verbose for anyone curious

       Fresh libc v0.2.14
       Fresh ruby-sys v0.2.6
   Compiling test_ruru v0.1.0 (file:///Users/william/code/test_ruru)
     Running `rustc src/main.rs --crate-name test_ruru --crate-type bin -g --out-dir /Users/william/code/test_ruru/target/debug --emit=dep-info,link -L dependency=/Users/william/code/test_ruru/target/debug -L dependency=/Users/william/code/test_ruru/target/debug/deps --extern ruby_sys=/Users/william/code/test_ruru/target/debug/deps/libruby_sys-6948a09fc5cf7b2c.rlib -L /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib`
src/main.rs:6:9: 6:12 warning: unused variable: `foo`, #[warn(unused_variables)] on by default
src/main.rs:6     let foo = array::rb_ary_new();
                      ^~~
     Running `target/debug/test_ruru`
error: Process didn't exit successfully: `target/debug/test_ruru` (signal: 11, SIGSEGV: invalid memory reference)

[steveklabnik]

Hm, it's not obvious to me what this would be off the top of my head; I'll have to dig in but it might take me a few days, sorry :/

[wshatch]

No problem, thanks for looking into it! Also, I realized I was using an old version of ruby (compiled without proper chruby version). Not sure if it helps, but here's cargo run --verbose with ruby 2.3.0.

   Compiling libc v0.2.14
     Running `rustc /Users/william/.cargo/registry/src/github.com-1ecc6299db9ec823/libc-0.2.14/src/lib.rs --crate-name libc --crate-type lib -g --cfg feature=\"use_std\" --cfg feature=\"default\" -C metadata=1f3392fe1afd1313 -C extra-filename=-1f3392fe1afd1313 --out-dir /Users/william/code/test_ruru/target/debug/deps --emit=dep-info,link -L dependency=/Users/william/code/test_ruru/target/debug/deps -L dependency=/Users/william/code/test_ruru/target/debug/deps --cap-lints allow`
   Compiling ruby-sys v0.2.6
     Running `rustc /Users/william/.cargo/registry/src/github.com-1ecc6299db9ec823/ruby-sys-0.2.6/build.rs --crate-name build_script_build --crate-type bin -g --cfg feature=\"default\" --out-dir /Users/william/code/test_ruru/target/debug/build/ruby-sys-63f7f6f801106a0a --emit=dep-info,link -L dependency=/Users/william/code/test_ruru/target/debug/deps -L dependency=/Users/william/code/test_ruru/target/debug/deps --cap-lints allow`
     Running `/Users/william/code/test_ruru/target/debug/build/ruby-sys-63f7f6f801106a0a/build-script-build`
     Running `rustc /Users/william/.cargo/registry/src/github.com-1ecc6299db9ec823/ruby-sys-0.2.6/src/lib.rs --crate-name ruby_sys --crate-type lib -g --cfg feature=\"default\" -C metadata=6948a09fc5cf7b2c -C extra-filename=-6948a09fc5cf7b2c --out-dir /Users/william/code/test_ruru/target/debug/deps --emit=dep-info,link -L dependency=/Users/william/code/test_ruru/target/debug/deps -L dependency=/Users/william/code/test_ruru/target/debug/deps --extern libc=/Users/william/code/test_ruru/target/debug/deps/liblibc-1f3392fe1afd1313.rlib --cap-lints allow -L /Users/william/.rubies/ruby-2.3.0/lib -l dylib=ruby.2.3.0`
   Compiling test_ruru v0.1.0 (file:///Users/william/code/test_ruru)
     Running `rustc src/main.rs --crate-name test_ruru --crate-type bin -g --out-dir /Users/william/code/test_ruru/target/debug --emit=dep-info,link -L dependency=/Users/william/code/test_ruru/target/debug -L dependency=/Users/william/code/test_ruru/target/debug/deps --extern ruby_sys=/Users/william/code/test_ruru/target/debug/deps/libruby_sys-6948a09fc5cf7b2c.rlib -L /Users/william/.rubies/ruby-2.3.0/lib`
src/main.rs:6:9: 6:12 warning: unused variable: `foo`, #[warn(unused_variables)] on by default
src/main.rs:6     let foo = array::rb_ary_new();
                      ^~~
     Running `target/debug/test_ruru`
error: Process didn't exit successfully: `target/debug/test_ruru` (signal: 11, SIGSEGV: invalid memory reference)

[Ryman]

Doesn't this require initializing the vm first?

[wshatch]

Yep, changed the code to

extern crate ruby_sys;
use ruby_sys::vm;
use ruby_sys::array;

fn main() {
  unsafe{
    vm::ruby_init();
    let foo = array::rb_ary_new();
  }
}