Deoptimization support for accessors.

src/mips/deoptimizer-mips.cc

Index: src/mips/deoptimizer-mips.cc
diff --git a/src/mips/deoptimizer-mips.cc b/src/mips/deoptimizer-mips.cc
index 14af894dbac523c1e9a8dd275f8f1d1a09beb8bb..666b8b34692f25dc7deef94fcfa73e9980f1fd3d 100644
--- a/src/mips/deoptimizer-mips.cc
+++ b/src/mips/deoptimizer-mips.cc
@@ -582,6 +582,114 @@ void Deoptimizer::DoComputeConstructStubFrame(TranslationIterator* iterator,
 }
 
 
+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 5 stack entries from StackFrame::INTERNAL (ra, fp, cp, frame type,
+  // code object, see MacroAssembler::EnterFrame) + 1 stack entry from setter
+  // stub (implicit return value, see StoreStubCompiler::CompileStoreViaSetter).
+  unsigned fixed_frame_size = (5 + 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.
+  uint32_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 value = output_[frame_index - 1]->GetPc();
+  output_frame->SetFrameSlot(output_offset, value);
+  if (FLAG_trace_deopt) {
+    PrintF("    0x%08" V8PRIxPTR ": [top + %u] <- 0x%08" V8PRIxPTR
+           " ; caller's pc\n",
+           top_address + output_offset, output_offset, value);
+  }
+
+  // Read caller's FP from the previous frame, and set this frame's FP.
+  output_offset -= kPointerSize;
+  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);
+}
+
+
 // This code is very similar to ia32/arm code, but relies on register names
 // (fp, sp) and how the frame is laid out.
 void Deoptimizer::DoComputeJSFrame(TranslationIterator* iterator,