Implement a variation of scalar replacement for non-escaping allocations.

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/cpu.h"
@@ skipping 7510 matching lines @@
 intptr_t DeoptInfo::FromIndex(intptr_t index) const {
   return *(EntryAddr(index, kFromIndex));
 }
 
 
 intptr_t DeoptInfo::Instruction(intptr_t index) const {
   return *(EntryAddr(index, kInstruction));
 }
 
 
+intptr_t DeoptInfo::FrameSize() const {
+  intptr_t pos = 0;
+  while (Instruction(pos) == DeoptInstr::kMaterializeObject) {
+    pos++;
+  }
+  return TranslationLength() - pos;
+}
+
+
 intptr_t DeoptInfo::TranslationLength() const {
   intptr_t length = Length();
   if (Instruction(length - 1) != DeoptInstr::kSuffix) return length;
 
   // If the last command is a suffix, add in the length of the suffix and
   // do not count the suffix command as a translation command.
   intptr_t ignored = 0;
   intptr_t suffix_length =
       DeoptInstr::DecodeSuffix(FromIndex(length - 1), &ignored);
   return length + suffix_length - 1;
@@ skipping 5684 matching lines @@
   }
   return result.raw();
 }
 
 
 const char* WeakProperty::ToCString() const {
   return "_WeakProperty";
 }
 
 }  // namespace dart