Unify deoptimizer for construct stub frames.

src/deoptimizer.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 904 matching lines @@
   Builtins* builtins = isolate_->builtins();
   Code* adaptor_trampoline =
       builtins->builtin(Builtins::kArgumentsAdaptorTrampoline);
   intptr_t pc_value = reinterpret_cast<intptr_t>(
       adaptor_trampoline->instruction_start() +
       isolate_->heap()->arguments_adaptor_deopt_pc_offset()->value());
   output_frame->SetPc(pc_value);
 }
 
 
+void Deoptimizer::DoComputeConstructStubFrame(TranslationIterator* iterator,
+                                              int frame_index) {
+  Builtins* builtins = isolate_->builtins();
+  Code* construct_stub = builtins->builtin(Builtins::kJSConstructStubGeneric);
+  JSFunction* function = JSFunction::cast(ComputeLiteral(iterator->Next()));
+  unsigned height = iterator->Next();
+  unsigned height_in_bytes = height * kPointerSize;
+  if (trace_) {
+    PrintF("  translating construct stub => height=%d\n", height_in_bytes);
+  }
+
+  unsigned fixed_frame_size = ConstructFrameConstants::kFrameSize;
+  unsigned output_frame_size = height_in_bytes + fixed_frame_size;
+
+  // Allocate and store the output frame description.
+  FrameDescription* output_frame =
+      new(output_frame_size) FrameDescription(output_frame_size, function);
+  output_frame->SetFrameType(StackFrame::CONSTRUCT);
+
+  // Construct stub can not be topmost or bottommost.
+  ASSERT(frame_index > 0 && frame_index < output_count_ - 1);
+  ASSERT(output_[frame_index] == NULL);
+  output_[frame_index] = output_frame;
+
+  // The top address of the frame is computed from the previous
+  // frame's top and this frame's size.
+  intptr_t top_address;
+  top_address = output_[frame_index - 1]->GetTop() - output_frame_size;
+  output_frame->SetTop(top_address);
+
+  // Compute the incoming parameter translation.
+  int parameter_count = height;
+  unsigned output_offset = output_frame_size;
+  for (int i = 0; i < parameter_count; ++i) {
+    output_offset -= kPointerSize;
+    DoTranslateCommand(iterator, frame_index, output_offset);
+  }
+
+  // Read caller's PC from the previous frame.
+  output_offset -= kPointerSize;
+  intptr_t callers_pc = output_[frame_index - 1]->GetPc();
+  output_frame->SetFrameSlot(output_offset, callers_pc);
+  if (trace_) {
+    PrintF("    0x%08" V8PRIxPTR ": [top + %d] <- 0x%08"
+           V8PRIxPTR " ; caller's pc\n",
+           top_address + output_offset, output_offset, callers_pc);
+  }
+
+  // Read caller's FP from the previous frame, and set this frame's FP.
+  output_offset -= kPointerSize;
+  intptr_t value = output_[frame_index - 1]->GetFp();
+  output_frame->SetFrameSlot(output_offset, value);
+  intptr_t fp_value = top_address + output_offset;
+  output_frame->SetFp(fp_value);
+  if (trace_) {
+    PrintF("    0x%08" V8PRIxPTR ": [top + %d] <- 0x%08"
+           V8PRIxPTR " ; caller's fp\n",
+           fp_value, output_offset, value);
+  }
+
+  // The context can be gotten from the previous frame.
+  output_offset -= kPointerSize;
+  value = output_[frame_index - 1]->GetContext();
+  output_frame->SetFrameSlot(output_offset, value);
+  if (trace_) {
+    PrintF("    0x%08" V8PRIxPTR ": [top + %d] <- 0x%08"
+           V8PRIxPTR " ; context\n",
+           top_address + output_offset, output_offset, value);
+  }
+
+  // A marker value is used in place of the function.
+  output_offset -= kPointerSize;
+  value = reinterpret_cast<intptr_t>(Smi::FromInt(StackFrame::CONSTRUCT));
+  output_frame->SetFrameSlot(output_offset, value);
+  if (trace_) {
+    PrintF("    0x%08" V8PRIxPTR ": [top + %d] <- 0x%08"
+           V8PRIxPTR " ; function (construct sentinel)\n",
+           top_address + output_offset, output_offset, value);
+  }
+
+  // The output frame reflects a JSConstructStubGeneric frame.
+  output_offset -= kPointerSize;
+  value = reinterpret_cast<intptr_t>(construct_stub);
+  output_frame->SetFrameSlot(output_offset, value);
+  if (trace_) {
+    PrintF("    0x%08" V8PRIxPTR ": [top + %d] <- 0x%08"
+           V8PRIxPTR " ; code object\n",
+           top_address + output_offset, output_offset, value);
+  }
+
+  // Number of incoming arguments.
+  output_offset -= kPointerSize;
+  value = reinterpret_cast<intptr_t>(Smi::FromInt(height - 1));
+  output_frame->SetFrameSlot(output_offset, value);
+  if (trace_) {
+    PrintF("    0x%08" V8PRIxPTR ": [top + %d] <- 0x%08"
+           V8PRIxPTR " ; argc (%d)\n",
+           top_address + output_offset, output_offset, value, height - 1);
+  }
+
+  // Constructor function being invoked by the stub (only present on some
+  // architectures, indicated by kConstructorOffset).
+  if (ConstructFrameConstants::kConstructorOffset != kMinInt) {
+    output_offset -= kPointerSize;
+    value = reinterpret_cast<intptr_t>(function);
+    output_frame->SetFrameSlot(output_offset, value);
+    if (trace_) {
+      PrintF("    0x%08" V8PRIxPTR ": [top + %d] <- 0x%08"
+             V8PRIxPTR " ; constructor function\n",
+             top_address + output_offset, output_offset, value);
+    }
+  }
+
+  // The newly allocated object was passed as receiver in the artificial
+  // constructor stub environment created by HEnvironment::CopyForInlining().
+  output_offset -= kPointerSize;
+  value = output_frame->GetFrameSlot(output_frame_size - kPointerSize);
+  output_frame->SetFrameSlot(output_offset, value);
+  if (trace_) {
+    PrintF("    0x%08" V8PRIxPTR ": [top + %d] <- 0x%08"
+           V8PRIxPTR " ; allocated receiver\n",
+           top_address + output_offset, output_offset, value);
+  }
+
+  ASSERT(0 == output_offset);
+
+  intptr_t pc = reinterpret_cast<intptr_t>(
+      construct_stub->instruction_start() +
+      isolate_->heap()->construct_stub_deopt_pc_offset()->value());
+  output_frame->SetPc(pc);
+}
+
+
 void Deoptimizer::DoComputeAccessorStubFrame(TranslationIterator* iterator,
                                              int frame_index,
                                              bool is_setter_stub_frame) {
   JSFunction* accessor = JSFunction::cast(ComputeLiteral(iterator->Next()));
   // The receiver (and the implicit return value, if any) are expected in
   // registers by the LoadIC/StoreIC, so they don't belong to the output stack
   // frame. This means that we have to use a height of 0.
   unsigned height = 0;
   unsigned height_in_bytes = height * kPointerSize;
   const char* kind = is_setter_stub_frame ? "setter" : "getter";
@@ skipping 1431 matching lines @@
 
 void DeoptimizedFrameInfo::Iterate(ObjectVisitor* v) {
   v->VisitPointer(BitCast<Object**>(&function_));
   v->VisitPointers(parameters_, parameters_ + parameters_count_);
   v->VisitPointers(expression_stack_, expression_stack_ + expression_count_);
 }
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 } }  // namespace v8::internal