Stream: git-cranelift

Topic: cranelift / Issue #1059 Panic on ebbs without instructions

GitHub (Jan 10 2020 at 10:39):

bnjbvr commented on Issue #1059:

Not fixed, though: it's still panicking somewhere else. We should throw a verifier error and have a nice error message in this case.

GitHub (Jan 10 2020 at 10:39):

bnjbvr labeled Issue #1059:

function u0:0() -> i32 system_v {
    gv0 = symbol colocated u1:0
    jt0 = jump_table [ebb1, ebb3]

ebb0:
    v0 = global_value.i64 gv0
    v1 = load.i32 v0
    v3 = icmp_imm uge v1, 1
    brnz v3, ebb4
    jump ebb3

ebb1:

ebb3:
    v2 = iconst.i32 1
    return v2

ebb4:
    v4 = iadd_imm.i32 v1, -1
    br_table v4, ebb3, jt0

ebb2:
    v5 = iconst.i32 0
    return v5
}
thread 'main' panicked at 'called `Option::unwrap()` on a `None` value', src/libcore/option.rs:347:21
stack backtrace:
   0: backtrace::backtrace::libunwind::trace
             at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.29/src/backtrace/libunwind.rs:88
   1: backtrace::backtrace::trace_unsynchronized
             at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.29/src/backtrace/mod.rs:66
   2: std::sys_common::backtrace::_print
             at src/libstd/sys_common/backtrace.rs:47
   3: std::sys_common::backtrace::print
             at src/libstd/sys_common/backtrace.rs:36
   4: std::panicking::default_hook::{{closure}}
             at src/libstd/panicking.rs:200
   5: std::panicking::default_hook
             at src/libstd/panicking.rs:214
   6: std::panicking::rust_panic_with_hook
             at src/libstd/panicking.rs:477
   7: std::panicking::continue_panic_fmt
             at src/libstd/panicking.rs:384
   8: rust_begin_unwind
             at src/libstd/panicking.rs:311
   9: core::panicking::panic_fmt
             at src/libcore/panicking.rs:85
  10: core::panicking::panic
             at src/libcore/panicking.rs:49
  11: core::option::Option<T>::unwrap
  12: cranelift_codegen::simple_gvn::do_simple_gvn
  13: cranelift_codegen::context::Context::simple_gvn
  14: cranelift_codegen::context::Context::compile
  15: cranelift_module::module::Module<B>::define_function
... truncated ...

GitHub (Jan 10 2020 at 12:33):

jyn514 commented on Issue #1059:

@bnjbvr that PR was never merged.

GitHub (Jan 10 2020 at 13:01):

bnjbvr commented on Issue #1059:

Sorry, I was it was closed, so I read that as merged, but no. That's a relatively easy bug to fix, though, if somebody wants to chime in!

GitHub (Jan 10 2020 at 14:59):

data-pup commented on Issue #1059:

I'd love to try and take a swing at fixing this, if nobody else has started on it already. :smiley_cat:

GitHub (Jan 10 2020 at 15:28):

jyn514 commented on Issue #1059:

@data-pup if you like you can just make a PR with my code: https://github.com/bytecodealliance/cranelift/commit/57830123733497558274b1514168a55d2dad2f55

GitHub (Jan 10 2020 at 17:04):

data-pup commented on Issue #1059:

I hadn't realized you already had a commit that takes care of this! Thanks @jyn514. I cherry-picked that code and updated the call to the fatal! macro, so hopefully this can be closed soon.

GitHub (Jan 10 2020 at 18:40):

abrown closed Issue #1059:

function u0:0() -> i32 system_v {
    gv0 = symbol colocated u1:0
    jt0 = jump_table [ebb1, ebb3]

ebb0:
    v0 = global_value.i64 gv0
    v1 = load.i32 v0
    v3 = icmp_imm uge v1, 1
    brnz v3, ebb4
    jump ebb3

ebb1:

ebb3:
    v2 = iconst.i32 1
    return v2

ebb4:
    v4 = iadd_imm.i32 v1, -1
    br_table v4, ebb3, jt0

ebb2:
    v5 = iconst.i32 0
    return v5
}
thread 'main' panicked at 'called `Option::unwrap()` on a `None` value', src/libcore/option.rs:347:21
stack backtrace:
   0: backtrace::backtrace::libunwind::trace
             at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.29/src/backtrace/libunwind.rs:88
   1: backtrace::backtrace::trace_unsynchronized
             at /cargo/registry/src/github.com-1ecc6299db9ec823/backtrace-0.3.29/src/backtrace/mod.rs:66
   2: std::sys_common::backtrace::_print
             at src/libstd/sys_common/backtrace.rs:47
   3: std::sys_common::backtrace::print
             at src/libstd/sys_common/backtrace.rs:36
   4: std::panicking::default_hook::{{closure}}
             at src/libstd/panicking.rs:200
   5: std::panicking::default_hook
             at src/libstd/panicking.rs:214
   6: std::panicking::rust_panic_with_hook
             at src/libstd/panicking.rs:477
   7: std::panicking::continue_panic_fmt
             at src/libstd/panicking.rs:384
   8: rust_begin_unwind
             at src/libstd/panicking.rs:311
   9: core::panicking::panic_fmt
             at src/libcore/panicking.rs:85
  10: core::panicking::panic
             at src/libcore/panicking.rs:49
  11: core::option::Option<T>::unwrap
  12: cranelift_codegen::simple_gvn::do_simple_gvn
  13: cranelift_codegen::context::Context::simple_gvn
  14: cranelift_codegen::context::Context::compile
  15: cranelift_module::module::Module<B>::define_function
... truncated ...

Last updated: Oct 23 2024 at 20:03 UTC