wrong line number for function in DWARF

[tromey]

Consider this test case:

fn main() {
    p();
}

fn p() {
    println!("Hi");
}

If I compile this and then examine the resulting DWARF line table for p, I see that it apparently covers line 2:

./p.rs:[++]
p.rs                                           5              0x4c50
p.rs                                           2              0x4cd8
p.rs                                           7              0x4cf1

A somewhat easy way to see this is with disassemble/s in gdb. (Also for some reason gdb thinks that this line 2 is the end of the prologue for the function, but from the disassembly this is many instructions in, so I think something else weird is going on here.)

[jseyfried]

This might be related to the failing test in #33749.

[xanlpz]

This seems to work fine with latest git rust (cb1f649).

[Mark-Simulacrum]

This appears to be fixed today; closing.

Dump of assembler code for function test::p:
test.rs:
5	fn p() {
   0x000055555555ce30 <+0>:	push   %rbp
   0x000055555555ce31 <+1>:	mov    %rsp,%rbp
   0x000055555555ce34 <+4>:	sub    $0x30,%rsp
   0x000055555555ce38 <+8>:	lea    -0x30(%rbp),%rdi
   0x000055555555ce3c <+12>:	lea    0x54b7d(%rip),%rcx        # 0x5555555b19c0 <str.1>
   0x000055555555ce43 <+19>:	xor    %eax,%eax
   0x000055555555ce45 <+21>:	mov    %eax,%r8d

6	    println!("Hi");
=> 0x000055555555ce48 <+24>:	mov    0x270441(%rip),%rsi        # 0x5555557cd290 <_ZN4test1p15__STATIC_FMTSTR17hb6e039e832f7c61fE>
   0x000055555555ce4f <+31>:	mov    0x270442(%rip),%rdx        # 0x5555557cd298 <_ZN4test1p15__STATIC_FMTSTR17hb6e039e832f7c61fE+8>
   0x000055555555ce56 <+38>:	callq  0x55555555cdb0 <core::fmt::{{impl}}::new_v1>
   0x000055555555ce5b <+43>:	lea    -0x30(%rbp),%rdi
   0x000055555555ce5f <+47>:	callq  0x55555556b070 <std::io::stdio::_print>

7	}
   0x000055555555ce64 <+52>:	add    $0x30,%rsp
   0x000055555555ce68 <+56>:	pop    %rbp
   0x000055555555ce69 <+57>:	retq
End of assembler dump.