Upon script loading deoptimize only functions whose owner has been subclassed, as that is the only…

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 1619 matching lines @@
     if (pc == (code_entry + offset.Value())) {
       *deopt_reason = static_cast<DeoptReasonId>(reason.Value());
       return;
     }
   }
   *deopt_info = DeoptInfo::null();
   *deopt_reason = kDeoptUnknown;
 }
 
 
+static void DeoptimizeAt(const Code& optimized_code, uword pc) {
+  DeoptInfo& deopt_info = DeoptInfo::Handle();
+  DeoptReasonId deopt_reason = kDeoptUnknown;
+  GetDeoptInfoAtPc(optimized_code, pc, &deopt_info, &deopt_reason);
+  ASSERT(!deopt_info.IsNull());
+  const Function& function = Function::Handle(optimized_code.function());
+  const Code& unoptimized_code = Code::Handle(function.unoptimized_code());
+  ASSERT(!unoptimized_code.IsNull());
+  // The switch to unoptimized code may have already occured.
+  if (function.HasOptimizedCode()) {
+    function.SwitchToUnoptimizedCode();
+  }
+  // Patch call site (lazy deoptimization is quite rare, patching it twice
+  // is not a performance issue).
+  uword lazy_deopt_jump = optimized_code.GetLazyDeoptPc();
+  ASSERT(lazy_deopt_jump != 0);
+  CodePatcher::InsertCallAt(pc, lazy_deopt_jump);
+  // Mark code as dead (do not GC its embedded objects).
+  optimized_code.set_is_alive(false);
+}
+
+
 // Currently checks only that all optimized frames have kDeoptIndex
 // and unoptimized code has the kDeoptAfter.
 void DeoptimizeAll() {
   DartFrameIterator iterator;
   StackFrame* frame = iterator.NextFrame();
   Code& optimized_code = Code::Handle();
-  Function& function = Function::Handle();
-  Code& unoptimized_code = Code::Handle();
   while (frame != NULL) {
     optimized_code = frame->LookupDartCode();
     if (optimized_code.is_optimized()) {
-      DeoptInfo& deopt_info = DeoptInfo::Handle();
-      DeoptReasonId deopt_reason = kDeoptUnknown;
-      GetDeoptInfoAtPc(optimized_code, frame->pc(), &deopt_info, &deopt_reason);
-      ASSERT(!deopt_info.IsNull());
-      function = optimized_code.function();
-      unoptimized_code = function.unoptimized_code();
-      ASSERT(!unoptimized_code.IsNull());
-      // The switch to unoptimized code may have already occured.
-      if (function.HasOptimizedCode()) {
-        function.SwitchToUnoptimizedCode();
-      }
-      // Patch call site (lazy deoptimization is quite rare, patching it twice
-      // is not a performance issue).
-      uword lazy_deopt_jump = optimized_code.GetLazyDeoptPc();
-      ASSERT(lazy_deopt_jump != 0);
-      CodePatcher::InsertCallAt(frame->pc(), lazy_deopt_jump);
-      // Mark code as dead (do not GC its embedded objects).
-      optimized_code.set_is_alive(false);
+      DeoptimizeAt(optimized_code, frame->pc());
     }
     frame = iterator.NextFrame();
   }
 }
 
 
+// Returns true if the given array of cids contains the given cid.
+static bool ContainsCid(const GrowableArray<intptr_t>& cids, intptr_t cid) {
+  for (intptr_t i = 0; i < cids.length(); i++) {
+    if (cids[i] == cid) {
+      return true;
+    }
+  }
+  return false;
+}
+
+
+// Deoptimize optimized code on stack if its class is in the 'classes' array.
+void DeoptimizeIfOwner(const GrowableArray<intptr_t>& classes) {
+  DartFrameIterator iterator;
+  StackFrame* frame = iterator.NextFrame();
+  Code& optimized_code = Code::Handle();
+  while (frame != NULL) {
+    optimized_code = frame->LookupDartCode();
+    if (optimized_code.is_optimized()) {
+      const intptr_t owner_cid = Class::Handle(Function::Handle(
+          optimized_code.function()).Owner()).id();
+      if (ContainsCid(classes, owner_cid)) {
+        DeoptimizeAt(optimized_code, frame->pc());
+      }
+    }
+  }
+}
+
+
 // Copy saved registers into the isolate buffer.
 static void CopySavedRegisters(uword saved_registers_address) {
   double* xmm_registers_copy = new double[kNumberOfXmmRegisters];
   ASSERT(xmm_registers_copy != NULL);
   for (intptr_t i = 0; i < kNumberOfXmmRegisters; i++) {
     xmm_registers_copy[i] = *reinterpret_cast<double*>(saved_registers_address);
     saved_registers_address += kDoubleSize;
   }
   Isolate::Current()->set_deopt_xmm_registers_copy(xmm_registers_copy);
 
@@ skipping 222 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