[PATCH] D153536: [Clang] Implement P2169 A nice placeholder with no name

[Corentin Jabot via Phabricator via cfe-commits]

cor3ntin added a subscriber: hubert.reinterpretcast.
cor3ntin added a comment.

Some tests with lldb

  (lldb) b main
  Breakpoint 1: where = placeholder`main + 4 at debug_placeholder.cpp:2:9, address = 0x0000555555555134
  (lldb) run
  Process 4044833 launched: '/home/cor3ntin/dev/compilers/LLVM/build-release/placeholder' (x86_64)
  Process 4044833 stopped
  * thread #1, name = 'placeholder', stop reason = breakpoint 1.1
      frame #0: 0x0000555555555134 placeholder`main at debug_placeholder.cpp:2:9
     1    int main() {
  -> 2        int _ = 0;
     3        int _ = 0;
     4        int _ = 0;
     5        {
     6            int _ = 0;
     7            int _ = 0;
  (lldb) step
  Process 4044833 stopped
  * thread #1, name = 'placeholder', stop reason = step in
      frame #0: 0x000055555555513b placeholder`main at debug_placeholder.cpp:3:9
     1    int main() {
     2        int _ = 0;
  -> 3        int _ = 0;
     4        int _ = 0;
     5        {
     6            int _ = 0;
     7            int _ = 0;
  (lldb) step
  Process 4044833 stopped
  * thread #1, name = 'placeholder', stop reason = step in
      frame #0: 0x0000555555555142 placeholder`main at debug_placeholder.cpp:4:9
     1    int main() {
     2        int _ = 0;
     3        int _ = 0;
  -> 4        int _ = 0;
     5        {
     6            int _ = 0;
     7            int _ = 0;
  (lldb) frame variable
  (int) _ = 0
  (int) _ = 0
  (int) _ = 0
  (lldb) step
  Process 4044833 stopped
  * thread #1, name = 'placeholder', stop reason = step in
      frame #0: 0x0000555555555149 placeholder`main at debug_placeholder.cpp:6:13
     3        int _ = 0;
     4        int _ = 0;
     5        {
  -> 6            int _ = 0;
     7            int _ = 0;
     8        }
     9    }
  (lldb) step
  Process 4044833 stopped
  * thread #1, name = 'placeholder', stop reason = step in
      frame #0: 0x0000555555555150 placeholder`main at debug_placeholder.cpp:7:13
     4        int _ = 0;
     5        {
     6            int _ = 0;
  -> 7            int _ = 0;
     8        }
     9    }
  (lldb) frame variable
  (int) _ = 0
  (int) _ = 0
  (int) _ = 0
  (int) _ = 0
  (int) _ = 32767
  (lldb) 

Seems to work well enough @hubert.reinterpretcast


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D153536/new/

https://reviews.llvm.org/D153536