From ddb7bff8016e30bd83edd817aa4d9793c0f4b624 Mon Sep 17 00:00:00 2001
From: Matt <matthew.alp@datadoghq.com>
Date: Tue, 18 Mar 2025 09:14:50 -0400
Subject: [PATCH] Downport of f0ceda6: Unwind String.indexOf intrinsic on
 AArch64. Fix TTSP test.

---
 ddprof-lib/src/main/cpp/stackFrame_aarch64.cpp | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/ddprof-lib/src/main/cpp/stackFrame_aarch64.cpp b/ddprof-lib/src/main/cpp/stackFrame_aarch64.cpp
index d9af9a6b..e169123e 100644
--- a/ddprof-lib/src/main/cpp/stackFrame_aarch64.cpp
+++ b/ddprof-lib/src/main/cpp/stackFrame_aarch64.cpp
@@ -98,7 +98,14 @@ bool StackFrame::unwindStub(instruction_t *entry, const char *name,
       pc = ((uintptr_t *)sp)[-1];
       return true;
     }
-  }
+  } else if (strncmp(name, "indexof_linear_", 15) == 0 &&
+                   entry != NULL && entry[0] == 0xa9be57f4 && entry[1] == 0xa9015ff6) {
+            // JDK-8189103: String.indexOf intrinsic.
+            // Entry and exit are covered by the very first 'if', in all other cases SP is 4 words off.
+            sp += 32;
+            pc = link();
+            return true;
+   }
   return false;
 }