[all-commits] [llvm/llvm-project] 5ae44b: [LoongArch] Add debug location for register reload

[wanglei via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5ae44bf718a460a2d5fd3636c8182093e1e27e7a
      https://github.com/llvm/llvm-project/commit/5ae44bf718a460a2d5fd3636c8182093e1e27e7a
  Author: wanglei <wanglei at loongson.cn>
  Date:   2025-01-09 (Thu, 09 Jan 2025)

  Changed paths:
    M llvm/lib/Target/LoongArch/LoongArchInstrInfo.cpp

  Log Message:
  -----------
  [LoongArch] Add debug location for register reload

Although the automatically inserted reload instruction in the `Epilogue`
is unrelated to the original code, in order to improve debugger
functionality, we have re-added debugging location information in the
reload instruction. When using an empty debugging location, the
following issue occurs:
```
loongson at linux:~$ cat -n test.c
 1  int printf(const char *, ...);
 2  int main(int argc, char **argv) {
 3    printf("%d\n", argc);
 4    return 0;
 5  }
 clang -g -O0 test.c -o test
```
Without this patch, the debugger is unable to correctly access the
current stack information when a breakpoint is set on line 4:

```
loongson at linux:~$ gdb -q ./test
Reading symbols from ./test...
(gdb) break 4
Breakpoint 1 at 0x7c0: file test.c, line 4.
(gdb) run
Starting program: /home/wanglei/test
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/loongarch64-linux-gnu/libthread_db.so.1".
1

Breakpoint 1, main (argc=<error reading variable: Cannot access memory at address 0xffffffffffffffe8>,
    argv=<error reading variable: Cannot access memory at address 0xffffffffffffffe0>) at test.c:4
4         return 0;
```

Reviewed By: heiher, xen0n

Pull Request: https://github.com/llvm/llvm-project/pull/122057



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