From bb149db5962bb9959adc139797992c8b3ab2bb7e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Manuel=20H=C3=A4ssig?= <manuel.hassig@oracle.com>
Date: Fri, 23 May 2025 15:27:41 +0200
Subject: [PATCH] Add block_index to IGV nodes

---
 src/hotspot/share/opto/idealGraphPrinter.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/hotspot/share/opto/idealGraphPrinter.cpp b/src/hotspot/share/opto/idealGraphPrinter.cpp
index 5154a85b0f8c1..f62f832f25f4f 100644
--- a/src/hotspot/share/opto/idealGraphPrinter.cpp
+++ b/src/hotspot/share/opto/idealGraphPrinter.cpp
@@ -474,6 +474,10 @@ void IdealGraphPrinter::visit_node(Node* n, bool edges) {
         // Enforce dots as decimal separators, as required by IGV.
         StringUtils::replace_no_expand(buffer, ",", ".");
         print_prop("frequency", buffer);
+        // Print block index for nodes that are placed in blocks and scheduled locally.
+        if (block->contains(node)) {
+          print_prop("block_index", block->find_node(node));
+        }
       }
     }