commit 39efc3695e36c0a0a0fb62243dbda34f3a919712
author Jonas Devlieghere <jonas@devlieghere.com> Wed Jul 27 10:44:15 2022 -0700
committer Copybara-Service <copybara-worker@google.com> Wed Jul 27 11:51:17 2022 -0700
tree aab1d66a5075d17c7c86dd1bf410ded31013d8df
parent b2df915ba4aad0a6592f588f107e6889f0e5316f

[DebugInfo] Teach LLVM and LLDB about ptrauth in DWARF

Teach libDebugInfo (llvm-dwarfdump) and lldb about DWARF tags and
attributes for pointer authentication. These values have been emitted by
Apple clang for several releases. Although upstream LLVM doesn't emit
these values yet, we hope to upstream that part sometime soon.

Differential revision: https://reviews.llvm.org/D130215

GitOrigin-RevId: a8c3d9815e0443bacf5315536ad356e4acb184f2

source/Plugins/SymbolFile/DWARF/DWARFDIE.cpp

diff --git a/source/Plugins/SymbolFile/DWARF/DWARFDIE.cpp b/source/Plugins/SymbolFile/DWARF/DWARFDIE.cpp
index 06cdd87..e1d0efa 100644
--- a/source/Plugins/SymbolFile/DWARF/DWARFDIE.cpp
+++ b/source/Plugins/SymbolFile/DWARF/DWARFDIE.cpp
@@ -320,6 +320,18 @@
   case DW_TAG_volatile_type:
     s.PutCString("volatile ");
     break;
+  case DW_TAG_LLVM_ptrauth_type: {
+    unsigned key = GetAttributeValueAsUnsigned(DW_AT_LLVM_ptrauth_key, 0);
+    bool isAddressDiscriminated = GetAttributeValueAsUnsigned(
+        DW_AT_LLVM_ptrauth_address_discriminated, 0);
+    unsigned extraDiscriminator =
+        GetAttributeValueAsUnsigned(DW_AT_LLVM_ptrauth_extra_discriminator, 0);
+    bool isaPointer =
+        GetAttributeValueAsUnsigned(DW_AT_LLVM_ptrauth_isa_pointer, 0);
+    s.Printf("__ptrauth(%d, %d, 0x0%x, %d)", key, isAddressDiscriminated,
+             extraDiscriminator, isaPointer);
+    break;
+  }
   default:
     return;
   }