8343296: IGV: Show pre/main/post at CountedLoopNodes

src/hotspot/share/opto/idealGraphPrinter.cpp

@@ -509,6 +509,10 @@ void IdealGraphPrinter::visit_node(Node *n, bool edges, VectorSet* temp_set) {
       print_prop("idealOpcode", (const char *)NodeClassNames[node->as_Mach()->ideal_Opcode()]);
     }
 
+    if (node->is_CountedLoop()) {
+      print_loop_kind(node->as_CountedLoop());
+    }
+
     print_field(node);
 
     buffer[0] = 0;
@@ -639,6 +643,20 @@ void IdealGraphPrinter::visit_node(Node *n, bool edges, VectorSet* temp_set) {
   }
 }
 
+void IdealGraphPrinter::print_loop_kind(const CountedLoopNode* counted_loop) {
+  const char* loop_kind = nullptr;
+  if (counted_loop->is_pre_loop()) {
+    loop_kind = "pre";
+  } else if (counted_loop->is_main_loop()) {
+    loop_kind = "main";
+  } else if (counted_loop->is_post_loop()) {
+    loop_kind = "post";
+  }
+  if (loop_kind != nullptr) {
+    print_prop("loop_kind", loop_kind);
+  }
+}
+
 void IdealGraphPrinter::print_bci_and_line_number(JVMState* caller) {
   if (caller != nullptr) {
     ResourceMark rm;

src/hotspot/share/opto/idealGraphPrinter.hpp

@@ -34,6 +34,7 @@
 #ifndef PRODUCT
 
 class Compile;
+class CountedLoopNode;
 class PhaseIFG;
 class PhaseChaitin;
 class Matcher;
@@ -124,6 +125,7 @@ class IdealGraphPrinter : public CHeapObj<mtCompiler> {
   IdealGraphPrinter();
   ~IdealGraphPrinter();
 
+  void print_loop_kind(const CountedLoopNode* counted_loop);
  public:
   IdealGraphPrinter(Compile* compile, const char* file_name = nullptr, bool append = false);
   static void clean_up();

src/utils/IdealGraphVisualizer/Filter/src/main/resources/com/sun/hotspot/igv/filter/helper.js

@@ -57,6 +57,11 @@ function hasAnyNode(selector) {
     return new AnySelector(selector);
 }
 
+// Select the nodes for which the given property is defined.
+function hasProperty(property) {
+    return new MatcherSelector(new Properties.InvertPropertyMatcher(new Properties.RegexpPropertyMatcher(property, "")));
+}
+
 // Select the nodes whose given property matches a given regular expression.
 function matches(property, regexp) {
     return new MatcherSelector(new Properties.RegexpPropertyMatcher(property, regexp));

src/utils/IdealGraphVisualizer/ServerCompiler/src/main/resources/com/sun/hotspot/igv/servercompiler/filters/customNodeInfo.filter

@@ -30,3 +30,8 @@ editProperty(matches("name", "CallLeaf|CallLeafNoFP"), ["dump_spec"], "extra_lab
              function(dump_spec) {return callLeafInfo(dump_spec[0], 1);});
 editProperty(matches("name", "CallLeafDirect|CallLeafDirectVector|CallLeafNoFPDirect"), ["dump_spec"], "extra_label",
              function(dump_spec) {return callLeafInfo(dump_spec[0], 0);});
+
+// Show pre/main/post at CountedLoopNodes.
+editProperty(hasProperty("loop_kind"), ["loop_kind"], "extra_label",
+             function(loop_kind) { return loop_kind[0]; });
+