Compress deoptimization information by sharing common suffixes.

runtime/vm/object.h

Index: runtime/vm/object.h
diff --git a/runtime/vm/object.h b/runtime/vm/object.h
index 1fbca5a5d2808f5fa1eee4d65a1d720949de305b..fbbfabc1b17133da72486ae233ff086c6b6d99a4 100644
--- a/runtime/vm/object.h
+++ b/runtime/vm/object.h
@@ -28,6 +28,7 @@ CLASS_LIST(DEFINE_FORWARD_DECLARATION)
 class Api;
 class Assembler;
 class Code;
+class DeoptInstr;
 class LocalScope;
 class Symbols;
 
@@ -2328,8 +2329,13 @@ class DeoptInfo : public Object {
   };
 
  public:
+  // The number of instructions.
   intptr_t Length() const;
 
+  // The number of real (non-suffix) instructions needed to execute the
+  // deoptimization translation.
+  intptr_t TranslationLength() const;
+
   static RawDeoptInfo* New(intptr_t num_commands);
 
   static const intptr_t kBytesPerElement = (kNumberOfEntries * kWordSize);
@@ -2357,6 +2363,11 @@ class DeoptInfo : public Object {
     return index;
   }
 
+  // Unpack the entire translation into an array of deoptimization
+  // instructions.  This copies any shared suffixes into the array.
+  void ToInstructions(const Array& table,
+                      GrowableArray<DeoptInstr*>* instructions) const;
+
  private:
   intptr_t* EntryAddr(intptr_t index, intptr_t entry_offset) const {
     ASSERT((index >=0) && (index < Length()));