1 files changed, 16 insertions, 4 deletions
diff --git a/compiler/optimizing/graph_visualizer.cc b/compiler/optimizing/graph_visualizer.cc
index 7ea1240c5e..7c302a9c96 100644
--- a/compiler/optimizing/graph_visualizer.cc
+++ b/compiler/optimizing/graph_visualizer.cc
@@ -42,13 +42,18 @@ static bool HasWhitespace(const char* str) {
 
 class StringList {
  public:
+  enum Format {
+    kArrayBrackets,
+    kSetBrackets,
+  };
+
   // Create an empty list
-  StringList() : is_empty_(true) {}
+  StringList(Format format = kArrayBrackets) : format_(format), is_empty_(true) {}
 
   // Construct StringList from a linked list. List element class T
   // must provide methods `GetNext` and `Dump`.
   template<class T>
-  explicit StringList(T* first_entry) : StringList() {
+  explicit StringList(T* first_entry, Format format = kArrayBrackets) : StringList(format) {
     for (T* current = first_entry; current != nullptr; current = current->GetNext()) {
       current->Dump(NewEntryStream());
     }
@@ -64,6 +69,7 @@ class StringList {
   }
 
  private:
+  Format format_;
   bool is_empty_;
   std::ostringstream sstream_;
 
@@ -71,7 +77,12 @@ class StringList {
 };
 
 std::ostream& operator<<(std::ostream& os, const StringList& list) {
-  return os << "[" << list.sstream_.str() << "]";
+  if (list.format_ == StringList::kArrayBrackets) {
+    return os << "[" << list.sstream_.str() << "]";
+  } else {
+    DCHECK_EQ(list.format_, StringList::kSetBrackets);
+    return os << "{" << list.sstream_.str() << "}";
+  }
 }
 
 /**
@@ -291,7 +302,8 @@ class HGraphVisualizerPrinter : public HGraphVisitor {
       StartAttributeStream("liveness") << instruction->GetLifetimePosition();
       if (instruction->HasLiveInterval()) {
         LiveInterval* interval = instruction->GetLiveInterval();
-        StartAttributeStream("ranges") << StringList(interval->GetFirstRange());
+        StartAttributeStream("ranges")
+            << StringList(interval->GetFirstRange(), StringList::kSetBrackets);
         StartAttributeStream("uses") << StringList(interval->GetFirstUse());
         StartAttributeStream("env_uses") << StringList(interval->GetFirstEnvironmentUse());
         StartAttributeStream("is_fixed") << interval->IsFixed();