Compress deopt instructions in memory using variable length encoding.

runtime/vm/deopt_instructions.h

Index: runtime/vm/deopt_instructions.h
diff --git a/runtime/vm/deopt_instructions.h b/runtime/vm/deopt_instructions.h
index 6583010cc92c05c5de6bdb91a77c7366eb818073..f2927f5fe2bd80474d7cc4e262b30cc4893ca008 100644
--- a/runtime/vm/deopt_instructions.h
+++ b/runtime/vm/deopt_instructions.h
@@ -98,7 +98,7 @@ class DeoptContext {
     return (deopt_flags_ & flag) != 0;
   }
 
-  RawDeoptInfo* deopt_info() const { return deopt_info_; }
+  RawTypedData* deopt_info() const { return deopt_info_; }
 
   // Fills the destination frame but defers materialization of
   // objects.
@@ -206,7 +206,7 @@ class DeoptContext {
 
   RawCode* code_;
   RawArray* object_table_;
-  RawDeoptInfo* deopt_info_;
+  RawTypedData* deopt_info_;
   bool dest_frame_is_allocated_;
   intptr_t* dest_frame_;
   intptr_t dest_frame_size_;
@@ -257,7 +257,6 @@ class DeoptInstr : public ZoneAllocated {
     kCallerFp,
     kCallerPp,
     kCallerPc,
-    kSuffix,
     kMaterializedObjectRef,
     kMaterializeObject
   };
@@ -285,10 +284,6 @@ class DeoptInstr : public ZoneAllocated {
     return (kind() == other.kind()) && (source_index() == other.source_index());
   }
 
-  // Decode the payload of a suffix command.  Return the suffix length and
-  // set the output parameter info_number to the index of the shared suffix.
-  static intptr_t DecodeSuffix(intptr_t source_index, intptr_t* info_number);
-
   // Get the code and return address which is encoded in this
   // kRetAfterAddress deopt instruction.
   static uword GetRetAddress(DeoptInstr* instr,
@@ -457,7 +452,7 @@ class DeoptInfoBuilder : public ValueObject {
   // Returns the index of the next stack slot. Used for verification.
   intptr_t EmitMaterializationArguments(intptr_t dest_index);
 
-  RawDeoptInfo* CreateDeoptInfo(const Array& deopt_table);
+  RawTypedData* CreateDeoptInfo(const Array& deopt_table);
 
   // Mark the actual start of the frame description after all materialization
   // instructions were emitted. Used for verification purposes.
@@ -508,6 +503,8 @@ class DeoptInfoBuilder : public ValueObject {
 // stored in an Array in the heap.  It consists of triples of (PC offset,
 // info, reason).  Elements of each entry are stored consecutively in the
 // array.
+// TODO(vegorov): consider compressing the whole table into a single TypedData
+// object.
 class DeoptTable : public AllStatic {
  public:
   // Return the array size in elements for a given number of table entries.
@@ -517,7 +514,7 @@ class DeoptTable : public AllStatic {
   static void SetEntry(const Array& table,
                        intptr_t index,
                        const Smi& offset,
-                       const DeoptInfo& info,
+                       const TypedData& info,
                        const Smi& reason_and_flags);
 
   // Return the length of the table in entries.
@@ -528,7 +525,7 @@ class DeoptTable : public AllStatic {
   static void GetEntry(const Array& table,
                        intptr_t index,
                        Smi* offset,
-                       DeoptInfo* info,
+                       TypedData* info,
                        Smi* reason_and_flags);
 
   static RawSmi* EncodeReasonAndFlags(ICData::DeoptReasonId reason,