Begin implementing flag --deoptimize-filter=FUNC for ia32.

runtime/vm/code_generator.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/code_generator.h"
 
 #include "vm/assembler.h"
 #include "vm/ast.h"
 #include "vm/bigint_operations.h"
 #include "vm/code_patcher.h"
@@ skipping 42 matching lines @@
 DEFINE_FLAG(bool, trace_runtime_calls, false, "Trace runtime calls");
 DEFINE_FLAG(bool, trace_type_checks, false, "Trace runtime type checks.");
 
 DECLARE_FLAG(int, deoptimization_counter_threshold);
 DECLARE_FLAG(bool, enable_type_checks);
 DECLARE_FLAG(bool, report_usage_count);
 
 DEFINE_FLAG(bool, use_osr, true, "Use on-stack replacement.");
 DEFINE_FLAG(bool, trace_osr, false, "Trace attempts at on-stack replacement.");
 
+DECLARE_FLAG(charp, deoptimize_filter);
+
 
 DEFINE_RUNTIME_ENTRY(TraceFunctionEntry, 1) {
   const Function& function = Function::CheckedHandle(arguments.ArgAt(0));
   const String& function_name = String::Handle(function.name());
   const String& class_name =
       String::Handle(Class::Handle(function.Owner()).Name());
   OS::PrintErr("> Entering '%s.%s'\n",
       class_name.ToCString(), function_name.ToCString());
 }
 
@@ skipping 1143 matching lines @@
     if (optimized_code.raw() != original_code.raw()) {
       // The OSR code does not work for calling the function, so restore the
       // unoptimized code.  Patch the stack frame to return into the OSR
       // code.
       uword optimized_entry =
           Instructions::Handle(optimized_code.instructions()).EntryPoint();
       function.AttachCode(original_code);
       frame->set_pc(optimized_entry);
     }
   }
+
+  if (FLAG_deoptimize_filter != NULL) {
+    DartFrameIterator iterator;
+    StackFrame* frame = iterator.NextFrame();
+    ASSERT(frame != NULL);
+    const Code& code = Code::ZoneHandle(frame->LookupDartCode());

[srdjan, 2014/04/04 17:55:23]

'code' can be Code::Handle as code does not escape scope.

+    ASSERT(!code.IsNull());
+    if (code.is_optimized()) {
+      const Function& function = Function::Handle(code.function());
+      ASSERT(!function.IsNull());
+      if (strstr(function.ToFullyQualifiedCString(),
+               FLAG_deoptimize_filter) != NULL) {
+        if (FLAG_trace_deoptimization || FLAG_trace_deoptimization_verbose) {
+          OS::PrintErr("*** Forcing deoptimization (%s)\n",
+                       function.ToFullyQualifiedCString());
+          DeoptimizeAll();
+        }
+      }
+    }
+  }
 }
 
 
 DEFINE_RUNTIME_ENTRY(TraceICCall, 2) {
   const ICData& ic_data = ICData::CheckedHandle(arguments.ArgAt(0));
   const Function& function = Function::CheckedHandle(arguments.ArgAt(1));
   DartFrameIterator iterator;
   StackFrame* frame = iterator.NextFrame();
   ASSERT(frame != NULL);
   OS::PrintErr("IC call @%#" Px ": ICData: %p cnt:%" Pd " nchecks: %" Pd
@@ skipping 312 matching lines @@
 // of the given value.
 //   Arg0: Field object;
 //   Arg1: Value that is being stored.
 DEFINE_RUNTIME_ENTRY(UpdateFieldCid, 2) {
   const Field& field = Field::CheckedHandle(arguments.ArgAt(0));
   const Object& value = Object::Handle(arguments.ArgAt(1));
   field.UpdateGuardedCidAndLength(value);
 }
 
 }  // namespace dart