Polymorphic calls in precompilation invoke megamorphic calls when tests fail (instead of deoptimizi…

runtime/vm/flow_graph_compiler.cc

 // Copyright (c) 2013, 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/globals.h"  // Needed here to get TARGET_ARCH_XXX.
 
 #include "vm/flow_graph_compiler.h"
 
 #include "vm/bit_vector.h"
 #include "vm/cha.h"
@@ skipping 38 matching lines @@
 
 DECLARE_FLAG(bool, background_compilation);
 DECLARE_FLAG(bool, code_comments);
 DECLARE_FLAG(bool, deoptimize_alot);
 DECLARE_FLAG(int, deoptimize_every);
 DECLARE_FLAG(charp, deoptimize_filter);
 DECLARE_FLAG(bool, disassemble);
 DECLARE_FLAG(bool, disassemble_optimized);
 DECLARE_FLAG(bool, emit_edge_counters);
 DECLARE_FLAG(bool, fields_may_be_reset);
-DECLARE_FLAG(bool, guess_other_cid);
+DECLARE_FLAG(bool, guess_icdata_cid);
 DECLARE_FLAG(bool, ic_range_profiling);
 DECLARE_FLAG(bool, intrinsify);
 DECLARE_FLAG(bool, load_deferred_eagerly);
 DECLARE_FLAG(int, optimization_counter_threshold);
 DECLARE_FLAG(bool, propagate_ic_data);
 DECLARE_FLAG(int, regexp_optimization_counter_threshold);
 DECLARE_FLAG(int, reoptimization_counter_threshold);
 DECLARE_FLAG(int, stacktrace_every);
 DECLARE_FLAG(charp, stacktrace_filter);
 DECLARE_FLAG(bool, support_debugger);
@@ skipping 21 matching lines @@
     FLAG_optimization_counter_threshold = -1;
     FLAG_use_field_guards = false;
     FLAG_use_osr = false;
     FLAG_emit_edge_counters = false;
     FLAG_support_debugger = false;
     FLAG_ic_range_profiling = false;
     FLAG_collect_code = false;
     FLAG_load_deferred_eagerly = true;
     FLAG_deoptimize_alot = false;  // Used in some tests.
     FLAG_deoptimize_every = 0;     // Used in some tests.
-    FLAG_guess_other_cid = true;
     Compiler::set_always_optimize(true);
     // Triggers assert if we try to recompile (e.g., because of deferred
     // loading, deoptimization, ...). Noopt mode simulates behavior
     // of precompiled code, therefore do not allow recompilation.
     Compiler::set_allow_recompilation(false);
     // Precompilation finalizes all classes and thus allows CHA optimizations.
     // Do not require CHA triggered deoptimization.
     FLAG_use_cha_deopt = false;
     // Calling the PrintStopMessage stub is not supported in precompiled code
     // since it is done at places where no pool pointer is loaded.
@@ skipping 1654 matching lines @@
                                 ICData::kDeoptPolymorphicInstanceCallTestFail);
     Label ok;
     EmitTestAndCall(ic_data, argument_count, argument_names,
                     deopt,  // No cid match.
                     &ok,    // Found cid.
                     deopt_id, token_pos, locs);
     assembler()->Bind(&ok);
   } else {
     // Instead of deoptimizing, do a megamorphic call when no matching
     // cid found.
-    Label megamorphic, ok;
+    Label ok;
+    MegamorphicSlowPath* slow_path =
+        new MegamorphicSlowPath(ic_data, argument_count, deopt_id,
+                                token_pos, locs, CurrentTryIndex());
+    AddSlowPathCode(slow_path);
     EmitTestAndCall(ic_data, argument_count, argument_names,
-                    &megamorphic,  // No cid match.
-                    &ok,           // Found cid.
+                    slow_path->entry_label(),  // No cid match.
+                    &ok,                       // Found cid.
                     deopt_id, token_pos, locs);
-    // Fall through if last test is match.
-    assembler()->Jump(&ok);
-    assembler()->Bind(&megamorphic);
-    EmitMegamorphicInstanceCall(ic_data, argument_count, deopt_id,
-                                token_pos, locs);
+
+    assembler()->Bind(slow_path->exit_label());
     assembler()->Bind(&ok);
   }
 }
 
 
 #if defined(DEBUG)
 void FlowGraphCompiler::FrameStateUpdateWith(Instruction* instr) {
   ASSERT(!is_optimizing());
 
   switch (instr->tag()) {
@@ skipping 60 matching lines @@
 
 
 void FlowGraphCompiler::FrameStateClear() {
   ASSERT(!is_optimizing());
   frame_state_.TruncateTo(0);
 }
 #endif
 
 
 }  // namespace dart