Trace when disabling optimized code (--trace-disabling-optimized-code)

runtime/vm/object.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/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/bigint_operations.h"
@@ skipping 25 matching lines @@
 namespace dart {
 
 DEFINE_FLAG(bool, generate_gdb_symbols, false,
     "Generate symbols of generated dart functions for debugging with GDB");
 DEFINE_FLAG(bool, reject_named_argument_as_positional, true,
     "Enforce new rules for optional parameters and disallow passing of named "
     "arguments to optional positional formal parameters");
 DEFINE_FLAG(bool, show_internal_names, false,
     "Show names of internal classes (e.g. \"OneByteString\") in error messages "
     "instead of showing the corresponding interface names (e.g. \"String\")");
+DEFINE_FLAG(bool, trace_disabling_optimized_code, false,
+    "Trace disabling optimized code.");
 DECLARE_FLAG(bool, trace_compiler);
 DECLARE_FLAG(bool, eliminate_type_checks);
 DECLARE_FLAG(bool, enable_type_checks);
 
 static const char* kGetterPrefix = "get:";
 static const intptr_t kGetterPrefixLength = strlen(kGetterPrefix);
 static const char* kSetterPrefix = "set:";
 static const intptr_t kSetterPrefixLength = strlen(kSetterPrefix);
 
 cpp_vtable Object::handle_vtable_ = 0;
@@ skipping 2954 matching lines @@
 void Function::SetCode(const Code& value) const {
   StorePointer(&raw_ptr()->code_, value.raw());
   ASSERT(Function::Handle(value.function()).IsNull() ||
     (value.function() == this->raw()));
   value.set_function(*this);
 }
 
 
 void Function::SwitchToUnoptimizedCode() const {
   ASSERT(HasOptimizedCode());
+  const Code& current_code = Code::Handle(CurrentCode());
+  if (FLAG_trace_disabling_optimized_code) {
+    OS::Print("Disabling optimized code: '%s' entry: %#"Px"\n",
+      ToFullyQualifiedCString(),
+      current_code.EntryPoint());
+  }
   // Patch entry of the optimized code.
-  CodePatcher::PatchEntry(Code::Handle(CurrentCode()));
+  CodePatcher::PatchEntry(current_code);
   // Use previously compiled unoptimized code.
   SetCode(Code::Handle(unoptimized_code()));
   CodePatcher::RestoreEntry(Code::Handle(unoptimized_code()));
 }
 
 
 void Function::set_unoptimized_code(const Code& value) const {
   StorePointer(&raw_ptr()->unoptimized_code_, value.raw());
 }
 
@@ skipping 9184 matching lines @@
   }
   return result.raw();
 }
 
 
 const char* WeakProperty::ToCString() const {
   return "_WeakProperty";
 }
 
 }  // namespace dart