Compress deoptimization information by sharing common suffixes.

runtime/vm/code_generator.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/code_generator.h"
 
 #include "vm/assembler_macros.h"
 #include "vm/ast.h"
 #include "vm/code_patcher.h"
 #include "vm/compiler.h"
@@ skipping 1594 matching lines @@
         function.deoptimization_counter());
   }
 
   // Compute the stack size of the unoptimized frame.  For functions with
   // optional arguments the deoptimization info does not describe the
   // incoming arguments.
   const Function& function = Function::Handle(optimized_code.function());
   const intptr_t num_args =
       function.HasOptionalParameters() ? 0 : function.num_fixed_parameters();
   intptr_t unoptimized_stack_size =
-      + deopt_info.Length() - num_args
+      + deopt_info.TranslationLength() - num_args
       - 2;  // Subtract caller FP and PC.
   return unoptimized_stack_size * kWordSize;
 }
 END_LEAF_RUNTIME_ENTRY
 
 
 
 static intptr_t DeoptimizeWithDeoptInfo(const Code& code,
                                         const DeoptInfo& deopt_info,
                                         const StackFrame& caller_frame) {
-  const intptr_t len = deopt_info.Length();
+  const intptr_t len = deopt_info.TranslationLength();
   GrowableArray<DeoptInstr*> deopt_instructions(len);
-  for (intptr_t i = 0; i < len; i++) {
-    deopt_instructions.Add(DeoptInstr::Create(deopt_info.Instruction(i),
-                                              deopt_info.FromIndex(i)));
-  }
+  const Array& deopt_table = Array::Handle(code.deopt_info_array());
+  ASSERT(!deopt_table.IsNull());
+  deopt_info.ToInstructions(deopt_table, &deopt_instructions);
 
   intptr_t* start = reinterpret_cast<intptr_t*>(caller_frame.sp() - kWordSize);
   const Function& function = Function::Handle(code.function());
   const intptr_t num_args =
       function.HasOptionalParameters() ? 0 : function.num_fixed_parameters();
   intptr_t to_frame_size =
       1  // Deoptimized function's return address.
       + (caller_frame.fp() - caller_frame.sp()) / kWordSize
       + 3  // caller-fp, pc, pc-marker.
       + num_args;
@@ skipping 110 matching lines @@
     intptr_t line, column;
     script.GetTokenLocation(token_pos, &line, &column);
     String& line_string = String::Handle(script.GetLine(line));
     OS::Print("  Function: %s\n", top_function.ToFullyQualifiedCString());
     OS::Print("  Line %"Pd": '%s'\n", line, line_string.ToCString());
   }
 }
 
 
 }  // namespace dart