[Valgrind-developers] [valgrind] Darwin DRD: add a bodge for LLVM DWARF that our reader does not like

[Paul F. <pa...@so...>]

https://sourceware.org/cgit/valgrind/commit/?id=38fbc300b38aeb7b337abe0526eaa7f738b305dc

commit 38fbc300b38aeb7b337abe0526eaa7f738b305dc
Author: Paul Floyd <pj...@wa...>
Date:   Thu Dec 11 08:03:46 2025 +0100

    Darwin DRD: add a bodge for LLVM DWARF that our reader does not like
    
    Longer term, need to understand Apple DWARF quirks and adapt to them
    as necessary.

Diff:
---
 coregrind/m_debuginfo/readdwarf3.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/coregrind/m_debuginfo/readdwarf3.c b/coregrind/m_debuginfo/readdwarf3.c
index 374237498e..b67e41b7cf 100644
--- a/coregrind/m_debuginfo/readdwarf3.c
+++ b/coregrind/m_debuginfo/readdwarf3.c
@@ -2977,6 +2977,14 @@ static void parse_var_DIE (
       if (level == 0)
          setup_cu_svma(cc, have_lo, ip_lo, td3);
 
+#if defined(VGO_darwin)
+      // FIXME PJF Darwin LLVM generates this (non-standard?) combination
+      // it only seems to affect DRD
+      if (have_lo && have_range && !have_hi1) {
+         have_lo = False;
+      }
+#endif
+
       /* Do we have something that looks sane? */
       if (have_lo && have_hi1 && (!have_range)) {
          if (ip_lo < ip_hi1)