Closed
Description
Problem
The test debuginfo/issue-22656 has the following failing assertion:
// lldbg-check:[...]$1 = StructWithZeroSizedField { x: ZeroSizedStruct, y: 123, z: ZeroSizedStruct, w: 456 }
Note the g, so this is for an LLDB that is not rust-enabled.
Here's what I see in the failing test stdout:
---- [debuginfo-gdb+lldb] debuginfo/issue-22656.rs stdout ----
NOTE: compiletest thinks it is using LLDB version 800
NOTE: compiletest thinks it is using LLDB without native rust support
...
print zs
(issue_22656::StructWithZeroSizedField) $1 = StructWithZeroSizedField { x: ZeroSizedStruct { }, y: 123, z: ZeroSizedStruct { }, w: 456 }
...
Full dump
running 1 test
F
failures:
---- [debuginfo-gdb+lldb] debuginfo/issue-22656.rs stdout ----
NOTE: compiletest thinks it is using LLDB version 800
NOTE: compiletest thinks it is using LLDB without native rust support
error: line not found in debugger output: [...]$1 = StructWithZeroSizedField { x: ZeroSizedStruct, y: 123, z: ZeroSizedStruct, w: 456 }
status: exit code: 0
command: "/bin/python2.7" "/home/joe/src/rust/src/etc/lldb_batchmode.py" "/home/joe/src/rust/build/x86_64-unknown-linux-gnu/test/debuginfo/issue-22656/a" "/home/joe/src/rust/build/x86_64-unknown-linux-gnu/test/debuginfo/issue-22656/issue-22656.debugger.script"
stdout:
------------------------------------------
LLDB batch-mode script
----------------------
Debugger commands script is '/home/joe/src/rust/build/x86_64-unknown-linux-gnu/test/debuginfo/issue-22656/issue-22656.debugger.script'.
Target executable is '/home/joe/src/rust/build/x86_64-unknown-linux-gnu/test/debuginfo/issue-22656/a'.
Current working directory is '/home/joe/src/rust'
Creating a target for '/home/joe/src/rust/build/x86_64-unknown-linux-gnu/test/debuginfo/issue-22656/a'
settings set auto-confirm true
version
lldb version 8.0.0
command script import /home/joe/src/rust/./src/etc/lldb_rust_formatters.py
type summary add --no-value --python-function lldb_rust_formatters.print_val -x ".*" --category Rust
type category enable Rust
breakpoint set --file 'issue-22656.rs' --line 46
Breakpoint 1: where = a`issue_22656::main::h884ad816d93c48d2 + 89 at issue-22656.rs:46:4, address = 0x00000000000015e9
run
Hit breakpoint 1.1: where = a`issue_22656::main::h884ad816d93c48d2 + 89 at issue-22656.rs:46:4, address = 0x00005555555555e9, resolved, hit count = 1
Process 14229 stopped * thread #1, name = 'a', stop reason = breakpoint 1.1 frame #0: 0x00005555555555e9 a`issue_22656::main::h884ad816d93c48d2 at issue-22656.rs:46:4 43 w: 456 44 }; 45 -> 46 zzz(); // #break ^ 47 } 48 49 fn zzz() { () } Process 14229 launched: '/home/joe/src/rust/build/x86_64-unknown-linux-gnu/test/debuginfo/issue-22656/a' (x86_64)
print v
(alloc::vec::Vec<int>) $0 = vec![1, 2, 3]
print zs
(issue_22656::StructWithZeroSizedField) $1 = StructWithZeroSizedField { x: ZeroSizedStruct { }, y: 123, z: ZeroSizedStruct { }, w: 456 }
quit
None
------------------------------------------
stderr:
------------------------------------------
------------------------------------------
failures:
[debuginfo-gdb+lldb] debuginfo/issue-22656.rs
test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 122 filtered out
So, it seems like LLDB 8 - even without built-in Rust support - does a better job than older versions when printing that local. It only fails to resolve the local var name zs.
It could be that we think there's something off about my local lldb. If not, and lldb 8+ is just doing a better job by default, we may need to refine the conditional assertions in the debuginfo tests, since they depend on debugger version.
Versions
Platform: x86-64 Linux
Distro: Void Linux
lldb: 8.0.0
My lldb version string:
$ lldb --version
lldb version 8.0.0
Note the absence of the string rust-enabled, which is what we look for in tools/compiletest/main.rs:extract_lldb_version to set lldb_native_rust.