[deoptimizer] Support virtual context in interpreted frame.

src/deoptimizer.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/deoptimizer.h"
 
 #include <memory>
 
 #include "src/accessors.h"
 #include "src/ast/prettyprinter.h"
@@ skipping 924 matching lines @@
     output_frame->SetCallerConstantPool(output_offset, value);
     DebugPrintOutputSlot(value, frame_index, output_offset,
                          "caller's constant_pool\n");
   }
 
   // For the bottommost output frame the context can be gotten from the input
   // frame. For all subsequent output frames it can be gotten from the function
   // so long as we don't inline functions that need local contexts.
   output_offset -= kPointerSize;
 
-  TranslatedFrame::iterator context_pos = value_iterator;
-  int context_input_index = input_index;
   // When deoptimizing into a catch block, we need to take the context
   // from just above the top of the operand stack (we push the context
   // at the entry of the try block).
+  TranslatedFrame::iterator context_pos = value_iterator;
+  int context_input_index = input_index;
   if (goto_catch_handler) {
     for (unsigned i = 0; i < height + 1; ++i) {
       context_pos++;
       context_input_index++;
     }
   }
   // Read the context from the translations.
   Object* context = context_pos->GetRawValue();
   if (context->IsUndefined(isolate_)) {
     // If the context was optimized away, just use the context from
@@ skipping 206 matching lines @@
       value = output_[frame_index - 1]->GetConstantPool();
     }
     output_frame->SetCallerConstantPool(output_offset, value);
     DebugPrintOutputSlot(value, frame_index, output_offset,
                          "caller's constant_pool\n");
   }
 
   // For the bottommost output frame the context can be gotten from the input
   // frame. For all subsequent output frames it can be gotten from the function
   // so long as we don't inline functions that need local contexts.
-  Register context_reg = InterpretedFrame::context_register();
   output_offset -= kPointerSize;
 
   // When deoptimizing into a catch block, we need to take the context
   // from a register that was specified in the handler table.
   TranslatedFrame::iterator context_pos = value_iterator;
   int context_input_index = input_index;
   if (goto_catch_handler) {
     // Skip to the translated value of the register specified
     // in the handler table.
     for (int i = 0; i < catch_handler_data_ + 1; ++i) {
       context_pos++;
       context_input_index++;
     }
   }
   // Read the context from the translations.
   Object* context = context_pos->GetRawValue();
-  // The context should not be a placeholder for a materialized object.
-  CHECK(context != isolate_->heap()->arguments_marker());
   value = reinterpret_cast<intptr_t>(context);
   output_frame->SetContext(value);
-  if (is_topmost) output_frame->SetRegister(context_reg.code(), value);
+  if (is_topmost) {
+    Register context_reg = InterpretedFrame::context_register();
+    output_frame->SetRegister(context_reg.code(), value);
+  }
   WriteValueToOutput(context, context_input_index, frame_index, output_offset,
                      "context    ");
+  if (context == isolate_->heap()->arguments_marker()) {
+    Address output_address =
+        reinterpret_cast<Address>(output_[frame_index]->GetTop()) +
+        output_offset;
+    values_to_materialize_.push_back({output_address, context_pos});
+  }
   value_iterator++;
   input_index++;
 
   // The function was mentioned explicitly in the BEGIN_FRAME.
   output_offset -= kPointerSize;
   value = reinterpret_cast<intptr_t>(function);
   WriteValueToOutput(function, 0, frame_index, output_offset, "function    ");
 
   // The new.target slot is only used during function activiation which is
   // before the first deopt point, so should never be needed. Just set it to
@@ skipping 2788 matching lines @@
       CHECK(value_info->IsMaterializedObject());
 
       value_info->value_ =
           Handle<Object>(previously_materialized_objects->get(i), isolate_);
     }
   }
 }
 
 }  // namespace internal
 }  // namespace v8