Deoptimization support for accessors.

src/x64/deoptimizer-x64.cc

 // Copyright 2012 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 573 matching lines @@
 
   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::DoComputeSetterStubFrame(TranslationIterator* iterator,
+                                           int frame_index) {
+  JSFunction* setter = JSFunction::cast(ComputeLiteral(iterator->Next()));
+  // The receiver and the implicit return value are expected in registers by the
+  // 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;
+  if (FLAG_trace_deopt) {
+    PrintF("  translating setter stub => height=%u\n", height_in_bytes);
+  }
+
+  // We need 1 stack entry for the return address + 4 stack entries from
+  // StackFrame::INTERNAL (FP, context, frame type, code object, see
+  // MacroAssembler::EnterFrame) + 1 stack entry from setter stub (implicit
+  // return value, see StoreStubCompiler::CompileStoreViaSetter).
+  unsigned fixed_frame_size = (1 + 4 + 1) * kPointerSize;
+  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, setter);
+  output_frame->SetFrameType(StackFrame::INTERNAL);
+
+  // A frame for a setter stub can not be the topmost or bottommost one.
+  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 = output_[frame_index - 1]->GetTop() - output_frame_size;
+  output_frame->SetTop(top_address);
+
+  unsigned output_offset = output_frame_size;
+
+  // 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 (FLAG_trace_deopt) {
+    PrintF("    0x%08" V8PRIxPTR ": [top + %u] <- 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 (FLAG_trace_deopt) {
+    PrintF("    0x%08" V8PRIxPTR ": [top + %u] <- 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 (FLAG_trace_deopt) {
+    PrintF("    0x%08" V8PRIxPTR ": [top + %u] <- 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::INTERNAL));
+  output_frame->SetFrameSlot(output_offset, value);
+  if (FLAG_trace_deopt) {
+    PrintF("    0x%08" V8PRIxPTR ": [top + %u] <- 0x%08" V8PRIxPTR
+           " ; function (setter sentinel)\n",
+           top_address + output_offset, output_offset, value);
+  }
+
+  // Get Code object from setter stub.
+  output_offset -= kPointerSize;
+  Code* setter_stub =
+      isolate_->builtins()->builtin(Builtins::kStoreIC_Setter_ForDeopt);
+  value = reinterpret_cast<intptr_t>(setter_stub);
+  output_frame->SetFrameSlot(output_offset, value);
+  if (FLAG_trace_deopt) {
+    PrintF("    0x%08" V8PRIxPTR ": [top + %u] <- 0x%08" V8PRIxPTR
+           " ; code object\n",
+           top_address + output_offset, output_offset, value);
+  }
+
+  // Skip receiver.
+  Translation::Opcode opcode =
+      static_cast<Translation::Opcode>(iterator->Next());
+  iterator->Skip(Translation::NumberOfOperandsFor(opcode));
+
+  // The implicit return value was part of the artificial setter stub
+  // environment.
+  output_offset -= kPointerSize;
+  DoTranslateCommand(iterator, frame_index, output_offset);
+
+  ASSERT(0 == output_offset);
+
+  intptr_t pc = reinterpret_cast<intptr_t>(
+      setter_stub->instruction_start() +
+      isolate_->heap()->setter_stub_deopt_pc_offset()->value());
+  output_frame->SetPc(pc);
+}
+
+
 void Deoptimizer::DoComputeJSFrame(TranslationIterator* iterator,
                                    int frame_index) {
   BailoutId node_id = BailoutId(iterator->Next());
   JSFunction* function;
   if (frame_index != 0) {
     function = JSFunction::cast(ComputeLiteral(iterator->Next()));
   } else {
     int closure_id = iterator->Next();
     USE(closure_id);
     ASSERT_EQ(Translation::kSelfLiteralId, closure_id);
@@ skipping 394 matching lines @@
   }
   __ bind(&done);
 }
 
 #undef __
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64