Fix convergence issues in range analysis.

runtime/vm/il_printer.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/il_printer.h"
 
 #include "vm/intermediate_language.h"
 #include "vm/os.h"
 #include "vm/parser.h"
 
@@ skipping 211 matching lines @@
 
 void Range::PrintTo(BufferFormatter* f) const {
   f->Print("[");
   min_.PrintTo(f);
   f->Print(", ");
   max_.PrintTo(f);
   f->Print("]");
 }
 
 
+const char* Range::ToCString(Range* range) {
+  if (range == NULL) return "[_|_, _|_]";
+
+  char buffer[256];
+  BufferFormatter f(buffer, sizeof(buffer));
+  range->PrintTo(&f);
+  return Isolate::Current()->current_zone()->MakeCopyOfString(buffer);
+}
+
+
 void RangeBoundary::PrintTo(BufferFormatter* f) const {
   switch (kind_) {
     case kSymbol:
       f->Print("v%"Pd, reinterpret_cast<Definition*>(value_)->ssa_temp_index());
       if (offset_ != 0) f->Print("%+"Pd, offset_);
       break;
     case kConstant:
-      f->Print("%"Pd, value_);
+      if (value_ == kMinusInfinity) {
+        f->Print("-inf");
+      } else if (value_ == kPlusInfinity) {
+        f->Print("+inf");
+      } else {
+        f->Print("%"Pd, value_);
+      }
       break;
     case kUnknown:
       f->Print("_|_");
       break;
   }
 }
 
 
 void AssertAssignableInstr::PrintOperandsTo(BufferFormatter* f) const {
   value()->PrintTo(f);
@@ skipping 581 matching lines @@
       f->Print(" [");
       locations_[i].PrintTo(f);
       f->Print("]");
     }
   }
   f->Print(" }");
   if (outer_ != NULL) outer_->PrintTo(f);
 }
 
 }  // namespace dart