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* [Bug rust/26202] New: Support calling methods on types
@ 2020-07-04 7:32 dxu at dxuuu dot xyz
2020-07-04 17:19 ` [Bug rust/26202] " tromey at sourceware dot org
0 siblings, 1 reply; 2+ messages in thread
From: dxu at dxuuu dot xyz @ 2020-07-04 7:32 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=26202
Bug ID: 26202
Summary: Support calling methods on types
Product: gdb
Version: HEAD
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: rust
Assignee: unassigned at sourceware dot org
Reporter: dxu at dxuuu dot xyz
Target Milestone: ---
For example, calling `Vec::len()` fails:
Breakpoint 1, rust_debug::foo () at src/main.rs:2
2 let v = vec!(1,2,3);
(gdb) n
3 println!("{:?}", v);
(gdb) p v.len()
Could not find function named 'alloc::vec::Vec<i32>::len'
It works for vectors in C++:
Temporary breakpoint 1, main () at main.cpp:4
4 int main() {
(gdb) n
5 std::vector<int> v{1,2,3};
(gdb) n
6 for (int i : v) {
(gdb) p v.size()
$1 = 3
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* [Bug rust/26202] Support calling methods on types
2020-07-04 7:32 [Bug rust/26202] New: Support calling methods on types dxu at dxuuu dot xyz
@ 2020-07-04 17:19 ` tromey at sourceware dot org
0 siblings, 0 replies; 2+ messages in thread
From: tromey at sourceware dot org @ 2020-07-04 17:19 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=26202
Tom Tromey <tromey at sourceware dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |tromey at sourceware dot org
--- Comment #1 from Tom Tromey <tromey at sourceware dot org> ---
I didn't look at the DWARF here, but in many cases the issue
is that rustc doesn't emit any information about traits; so
if a method is defined via a trait, then gdb simply can't know that.
Also, for C++, sometimes there are "xmethods" supplied by
libstdc++, so that this works even when the method is entirely
optimized away. There's a gdb bug open about this topic
for Rust.
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2020-07-04 7:32 [Bug rust/26202] New: Support calling methods on types dxu at dxuuu dot xyz
2020-07-04 17:19 ` [Bug rust/26202] " tromey at sourceware dot org
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