Closed
Description
Environment
Local Environment
Darwin genesis.local 14.4.0 Darwin Kernel Version 14.4.0: Thu May 28 11:35:04 PDT 2015; root:xnu-2782.30.5~1/RELEASE_X86_64 x86_64
rustc 1.0.0 (a59de37e9 2015-05-13) (built 2015-05-14)
Playpen Environment
This was tested 01/07/2015. I am not sure how to get the exact versions from the playpen.
Error
On 1.0.0 Stable (tested on local environment)
rustc src/lib.rs --crate-name ecs --crate-type lib -g --test -C metadata=33fec8143b6dd287 -C extra-filename=-33fec8143b6dd287 --out-dir /Users/salad/Code/Rust/ecs/target/debug --emit=dep-info,link -L dependency=/Users/salad/Code/Rust/ecs/target/debug -L dependency=/Users/salad/Code/Rust/ecs/target/debug/deps
src/lib.rs:8:5: 8:19 warning: struct field is never used: `entity`, #[warn(dead_code)] on by default
src/lib.rs:8 entity: Entity,
^~~~~~~~~~~~~~
[1] 10781 segmentation fault rustc src/lib.rs --crate-name ecs --crate-type lib -g --test -C -C --out-di
On 1.1.0 Stable (tested on playpen)
Illegal instruction (core dumped)
playpen: application terminated with error code 132
On nightly (tested on playpen)
rustc: /home/rustbuild/src/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/llvm/include/llvm/IR/Instructions.h:823: llvm::Type* llvm::checkGEPType(llvm::Type*): Assertion `Ty && "Invalid GetElementPtrInst indices for type!"' failed.
Aborted (core dumped)
playpen: application terminated with error code 134
Notes
This only occurs when trying to compile and run the test cast using cargo test. Simply building the example with cargo build works as expected (no crash).
Related Issues
I searched for related issues but they all seem to be solved, and this is still occurring. Hence I am opening a new issue instead. The related issues that I found with a similar assertion:
- llvm: Assertion `Ty && "Invalid GetElementPtrInst indices for type!"' failed. #23649
- LLVM assertion failure with nested trait #3702
- search results
Minimal Reproducable Example
Thanks to @arielb1
trait SomeTrait {}
impl SomeTrait for i32 {}
struct Component<T:?Sized>(T);
fn main() {
let ref c = Component(42);
let &Component(ref data) = c as &Component<SomeTrait>;
}
Full Code Snippet
use std::any::Any;
struct Entity(u64);
struct Component<T: ?Sized>(T);
struct EntityData {
entity: Entity,
components: Vec<Box<Component<Any>>>,
}
impl EntityData {
pub fn new() -> Self {
EntityData {
entity: Entity(0),
components: Vec::new(),
}
}
pub fn attach<T: Sized + Any>(&mut self, data: T) {
let c = Component(data);
let x = Box::new(c);
self.components.push(x);
}
pub fn get<T: Any>(&self) -> Option<&T> {
let first = &self.components[0];
let Component(ref data) = **first;
data.downcast_ref::<T>()
}
}
#[test]
pub fn attach_and_get() {
let mut e = EntityData::new();
let c = Component::<u64>(1234);
e.attach(c);
let u = e.get::<u64>().unwrap();
assert!(*u == 1234);
}