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

runtime/vm/flow_graph_compiler.h

 // 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.
 
 #ifndef VM_FLOW_GRAPH_COMPILER_H_
 #define VM_FLOW_GRAPH_COMPILER_H_
 
 #include "vm/allocation.h"
 #include "vm/assembler.h"
 #include "vm/code_descriptors.h"
@@ skipping 196 matching lines @@
  private:
   virtual void EmitNativeCode(FlowGraphCompiler* compiler) = 0;
 
   Label entry_label_;
   Label exit_label_;
 
   DISALLOW_COPY_AND_ASSIGN(SlowPathCode);
 };
 
 
+class MegamorphicSlowPath : public SlowPathCode {
+ public:
+  MegamorphicSlowPath(const ICData& ic_data,
+                      intptr_t argument_count,
+                      intptr_t deopt_id,
+                      intptr_t token_pos,
+                      LocationSummary* locs,
+                      intptr_t try_index)
+    : SlowPathCode(),
+      ic_data_(ic_data),
+      argument_count_(argument_count),
+      deopt_id_(deopt_id),
+      token_pos_(token_pos),
+      locs_(locs),
+      try_index_(try_index) {}
+  virtual ~MegamorphicSlowPath() {}
+
+ private:
+  virtual void EmitNativeCode(FlowGraphCompiler* comp);
+
+  const ICData& ic_data_;
+  intptr_t argument_count_;
+  intptr_t deopt_id_;
+  intptr_t token_pos_;
+  LocationSummary* locs_;
+  const intptr_t try_index_;  // For try/catch ranges.
+
+  DISALLOW_COPY_AND_ASSIGN(MegamorphicSlowPath);
+};
+
+
 struct CidTarget {
   intptr_t cid;
   Function* target;
   intptr_t count;
   CidTarget(intptr_t cid_arg,
             Function* target_arg,
             intptr_t count_arg)
       : cid(cid_arg), target(target_arg), count(count_arg) {}
 };
 
@@ skipping 180 matching lines @@
                         intptr_t token_pos,
                         LocationSummary* locs);
 
   void EmitPolymorphicInstanceCall(const ICData& ic_data,
                                    intptr_t argument_count,
                                    const Array& argument_names,
                                    intptr_t deopt_id,
                                    intptr_t token_pos,
                                    LocationSummary* locs);
 
-  void EmitMegamorphicInstanceCall(const ICData& ic_data,
-                                   intptr_t argument_count,
-                                   intptr_t deopt_id,
-                                   intptr_t token_pos,
-                                   LocationSummary* locs);
+  // Pass a value for try-index where block is not available (e.g. slow path).
+  void EmitMegamorphicInstanceCall(
+      const ICData& ic_data,
+      intptr_t argument_count,
+      intptr_t deopt_id,
+      intptr_t token_pos,
+      LocationSummary* locs,
+      intptr_t try_index = CatchClauseNode::kInvalidTryIndex);
 
   void EmitSwitchableInstanceCall(const ICData& ic_data,
                                   intptr_t argument_count,
                                   intptr_t deopt_id,
                                   intptr_t token_pos,
                                   LocationSummary* locs);
 
   void EmitTestAndCall(const ICData& ic_data,
                        intptr_t arg_count,
                        const Array& arg_names,
@@ skipping 315 matching lines @@
   Array& inlined_code_intervals_;
   const GrowableArray<const Function*>& inline_id_to_function_;
   const GrowableArray<intptr_t>& caller_inline_id_;
 
   DISALLOW_COPY_AND_ASSIGN(FlowGraphCompiler);
 };
 
 }  // namespace dart
 
 #endif  // VM_FLOW_GRAPH_COMPILER_H_