[llvm-dev] GSoC Idea Project

[Cheng, Xiang via llvm-dev]

Hi all,

I'm Xiang Cheng in Gatech and I'm interested in this project: http://llvm.org/OpenProjects.html#llvm_dbg_invariant

I noticed that this project is not in the GSoC selected projects list, so I think nobody is working on this.

Now I try to reproduce this issue on aarch64 Ubuntu-18.04 using the latest LLVM-10 release with following code (http://lists.llvm.org/pipermail/llvm-dev/2019-September/135433.html):

void b(void* d){}

void c(char* cc, void* d){}

void a() {
      b(a);
      for (;;)
        c("", b);
    }
int main(){
    a();
    return 0;
}

I compile it using "-O0 -g" or only "-O0". However, I failed to reproduce the issue since all the outputs have the same instructions in their .text regions (attached below).

Could you please give a sample to reproduce this issue? Or is this bug has been fixed(https://bugs.llvm.org/show_bug.cgi?id=37240)?

Best,
Xiang



00000000004004f4 <b>:
  4004f4: d10043ff sub sp, sp, #0x10
  4004f8: f90007e0 str x0, [sp, #8]
  4004fc: 910043ff add sp, sp, #0x10
  400500: d65f03c0 ret

0000000000400504 <c>:
  400504: d10043ff sub sp, sp, #0x10
  400508: f90007e0 str x0, [sp, #8]
  40050c: f90003e1 str x1, [sp]
  400510: 910043ff add sp, sp, #0x10
  400514: d65f03c0 ret

0000000000400518 <a>:
  400518: a9bf7bfd stp x29, x30, [sp, #-16]!
  40051c: 910003fd mov x29, sp
  400520: 90000000 adrp x0, 400000 <_init-0x388>
  400524: 91146000 add x0, x0, #0x518
  400528: 97fffff3 bl 4004f4 <b>
  40052c: 90000000 adrp x0, 400000 <_init-0x388>
  400530: 91188000 add x0, x0, #0x620
  400534: 90000001 adrp x1, 400000 <_init-0x388>
  400538: 9113d021 add x1, x1, #0x4f4
  40053c: 97fffff2 bl 400504 <c>
  400540: 17fffffb b 40052c <a+0x14>

0000000000400544 <main>:
  400544: d10083ff sub sp, sp, #0x20
  400548: a9017bfd stp x29, x30, [sp, #16]
  40054c: 910043fd add x29, sp, #0x10
  400550: 2a1f03e8 mov w8, wzr
  400554: b81fc3bf stur wzr, [x29, #-4]
  400558: b9000be8 str w8, [sp, #8]
  40055c: 97ffffef bl 400518 <a>
  400560: b9400be0 ldr w0, [sp, #8]
  400564: a9417bfd ldp x29, x30, [sp, #16]
  400568: 910083ff add sp, sp, #0x20
  40056c: d65f03c0 ret

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