Optimize function at its entry instead of at exit.

runtime/vm/object.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/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/bigint_operations.h"
@@ skipping 6562 matching lines @@
     result.SetLength(num_descriptors);
   }
   return result.raw();
 }
 
 
 const char* PcDescriptors::KindAsStr(intptr_t index) const {
   switch (DescriptorKind(index)) {
     case PcDescriptors::kDeoptBefore:   return "deopt-before ";
     case PcDescriptors::kDeoptAfter:    return "deopt-after  ";
+    case PcDescriptors::kEntryPatch:    return "entry-patch  ";
     case PcDescriptors::kPatchCode:     return "patch        ";
     case PcDescriptors::kLazyDeoptJump: return "lazy-deopt   ";
     case PcDescriptors::kIcCall:        return "ic-call      ";
     case PcDescriptors::kFuncCall:      return "fn-call      ";
     case PcDescriptors::kReturn:        return "return       ";
     case PcDescriptors::kOther:         return "other        ";
   }
   UNREACHABLE();
   return "";
 }
@@ skipping 673 matching lines @@
   return token_pos;
 }
 
 
 uword Code::GetPcForDeoptId(intptr_t deopt_id, PcDescriptors::Kind kind) const {
   const PcDescriptors& descriptors = PcDescriptors::Handle(pc_descriptors());
   for (intptr_t i = 0; i < descriptors.Length(); i++) {
     if ((descriptors.DeoptId(i) == deopt_id) &&
         (descriptors.DescriptorKind(i) == kind)) {
       uword pc = descriptors.PC(i);
-      ASSERT((EntryPoint() < pc) && (pc < (EntryPoint() + Size())));
+      ASSERT((EntryPoint() <= pc) && (pc < (EntryPoint() + Size())));
       return pc;
     }
   }
   return 0;
 }
 
 
 uword Code::GetDeoptBeforePcAtDeoptId(intptr_t deopt_id) const {
   ASSERT(!is_optimized());
   return GetPcForDeoptId(deopt_id, PcDescriptors::kDeoptBefore);
@@ skipping 5141 matching lines @@
   }
   return result.raw();
 }
 
 
 const char* WeakProperty::ToCString() const {
   return "_WeakProperty";
 }
 
 }  // namespace dart