Compile FastCloneShallowObjectStub using Crankshaft.

src/arm/deoptimizer-arm.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 434 matching lines @@
   Builtins* builtins = isolate_->builtins();
   Code* adaptor_trampoline =
       builtins->builtin(Builtins::kArgumentsAdaptorTrampoline);
   uint32_t pc = reinterpret_cast<uint32_t>(
       adaptor_trampoline->instruction_start() +
       isolate_->heap()->arguments_adaptor_deopt_pc_offset()->value());
   output_frame->SetPc(pc);
 }
 
 
-void Deoptimizer::DoCompiledStubFrame(TranslationIterator* iterator,
-                                      int frame_index) {
+void Deoptimizer::DoComputeCompiledStubFrame(TranslationIterator* iterator,
+                                             int frame_index) {
   //
   //               FROM                                  TO
   //    |          ....           |          |          ....           |
   //    +-------------------------+          +-------------------------+
   //    | JSFunction continuation |          | JSFunction continuation |
   //    +-------------------------+          +-------------------------+
   // |  |   saved frame (fp)      |          |   saved frame (fp)      |
   // |  +=========================+<-fp      +=========================+<-fp
   // |  |   JSFunction context    |          |   JSFunction context    |
   // v  +-------------------------+          +-------------------------|
   //    |   COMPILED_STUB marker  |          |   STUB_FAILURE marker   |
   //    +-------------------------+          +-------------------------+
-  //    |                         |          |   caller args.length_   |
+  //    |                         |          |  caller args.arguments_ |
   //    | ...                     |          +-------------------------+
-  //    |                         |          |  caller args.arguments_ |
+  //    |                         |          |  caller args.length_    |
   //    |-------------------------|<-sp      +-------------------------+
   //                                         |  caller args pointer    |
   //                                         +-------------------------+
   //                                         |  caller stack param 1   |
   //      parameters in registers            +-------------------------+
   //       and spilled to stack              |           ....          |
   //                                         +-------------------------+
   //                                         |  caller stack param n   |
   //                                         +-------------------------+<-sp
   //                                         r0 = number of parameters
   //                                         r1 = failure handler address
   //                                         fp = saved frame
   //                                         cp = JSFunction context
   //
 
   ASSERT(compiled_code_->kind() == Code::COMPILED_STUB);
   int major_key = compiled_code_->major_key();
   CodeStubInterfaceDescriptor* descriptor =
       isolate_->code_stub_interface_descriptor(major_key);
 
   // The output frame must have room for all pushed register parameters
-  // and the standard stack frame slots.
-  int output_frame_size = StandardFrameConstants::kFixedFrameSize +
-      kPointerSize * descriptor->register_param_count_;
+  // and the standard stack frame slots.  Include space for an argument
+  // object to the callee and optionally the space to pass the argument
+  // object to the stub failure handler.
+  int height_in_bytes = kPointerSize * descriptor->register_param_count_ +
+      sizeof(Arguments) + kPointerSize;
+  int fixed_frame_size = StandardFrameConstants::kFixedFrameSize;
+  int input_frame_size = input_->GetFrameSize();
+  int output_frame_size = height_in_bytes + fixed_frame_size;
+  if (trace_) {
+    PrintF("  translating %s => StubFailureTrampolineStub, height=%d\n",
+           CodeStub::MajorName(static_cast<CodeStub::Major>(major_key), false),
+           height_in_bytes);
+  }
 
-  // Include space for an argument object to the callee and optionally
-  // the space to pass the argument object to the stub failure handler.
-  output_frame_size += sizeof(Arguments) + kPointerSize;
-
+  // The stub failure trampoline is a single frame.
   FrameDescription* output_frame =
-      new(output_frame_size) FrameDescription(output_frame_size, 0);
+      new(output_frame_size) FrameDescription(output_frame_size, NULL);
+  output_frame->SetFrameType(StackFrame::STUB_FAILURE_TRAMPOLINE);
   ASSERT(frame_index == 0);
   output_[frame_index] = output_frame;
-  Code* notify_failure =
-      isolate_->builtins()->builtin(Builtins::kNotifyStubFailure);
-  output_frame->SetState(Smi::FromInt(FullCodeGenerator::NO_REGISTERS));
-  output_frame->SetContinuation(
-      reinterpret_cast<intptr_t>(notify_failure->entry()));
 
-  Code* trampoline = NULL;
-  int extra = descriptor->extra_expression_stack_count_;
-  StubFailureTrampolineStub(extra).FindCodeInCache(&trampoline, isolate_);
-  ASSERT(trampoline != NULL);
-  output_frame->SetPc(reinterpret_cast<intptr_t>(
-      trampoline->instruction_start()));
-  unsigned input_frame_size = input_->GetFrameSize();
+  // The top address for the output frame can be computed from the input
+  // frame pointer and the output frame's height. Subtract space for the
+  // context and function slots.
+  intptr_t top_address = input_->GetRegister(fp.code()) - (2 * kPointerSize) -
+        height_in_bytes;
+  output_frame->SetTop(top_address);
 
-  intptr_t frame_ptr = input_->GetRegister(fp.code());
-
-  // JSFunction continuation
+  // Read caller's PC (JSFunction continuation) from the input frame.
   intptr_t input_frame_offset = input_frame_size - kPointerSize;
   intptr_t output_frame_offset = output_frame_size - kPointerSize;
   intptr_t value = input_->GetFrameSlot(input_frame_offset);
   output_frame->SetFrameSlot(output_frame_offset, value);
+  if (trace_) {
+    PrintF("    0x%08x: [top + %d] <- 0x%08x ; caller's pc\n",
+           top_address + output_frame_offset, output_frame_offset, value);
+  }
 
-  // saved frame ptr
+  // Read caller's FP from the input frame, and set this frame's FP.
   input_frame_offset -= kPointerSize;
   value = input_->GetFrameSlot(input_frame_offset);
   output_frame_offset -= kPointerSize;
   output_frame->SetFrameSlot(output_frame_offset, value);
+  intptr_t frame_ptr = input_->GetRegister(fp.code());
+  output_frame->SetRegister(fp.code(), frame_ptr);
+  output_frame->SetFp(frame_ptr);
+  if (trace_) {
+    PrintF("    0x%08x: [top + %d] <- 0x%08x ; caller's fp\n",
+           top_address + output_frame_offset, output_frame_offset, value);
+  }
 
-  // Restore context
+  // The context can be gotten from the input frame.
   input_frame_offset -= kPointerSize;
   value = input_->GetFrameSlot(input_frame_offset);
   output_frame->SetRegister(cp.code(), value);
   output_frame_offset -= kPointerSize;
   output_frame->SetFrameSlot(output_frame_offset, value);
+  if (trace_) {
+    PrintF("    0x%08x: [top + %d] <- 0x%08x ; context\n",
+           top_address + output_frame_offset, output_frame_offset, value);
+  }
 
-  // Internal frame markers
+  // A marker value is used in place of the function.
   output_frame_offset -= kPointerSize;
   value = reinterpret_cast<intptr_t>(
       Smi::FromInt(StackFrame::STUB_FAILURE_TRAMPOLINE));
   output_frame->SetFrameSlot(output_frame_offset, value);
+  if (trace_) {
+    PrintF("    0x%08x: [top + %d] <- 0x%08x ; function (stub fail sentinel)\n",
+           top_address + output_frame_offset, output_frame_offset, value);
+  }
 
   int caller_arg_count = 0;
   if (descriptor->stack_parameter_count_ != NULL) {
     caller_arg_count =
         input_->GetRegister(descriptor->stack_parameter_count_->code());
   }
 
   // Build the Arguments object for the caller's parameters and a pointer to it.
   output_frame_offset -= kPointerSize;
   value = frame_ptr + StandardFrameConstants::kCallerSPOffset +
       (caller_arg_count - 1) * kPointerSize;
   output_frame->SetFrameSlot(output_frame_offset, value);
+  if (trace_) {
+    PrintF("    0x%08x: [top + %d] <- 0x%08x ; args.arguments\n",
+           top_address + output_frame_offset, output_frame_offset, value);
+  }
 
+  output_frame_offset -= kPointerSize;
+  value = caller_arg_count;
   output_frame->SetFrameSlot(output_frame_offset, value);
+  if (trace_) {
+    PrintF("    0x%08x: [top + %d] <- 0x%08x ; args.length\n",
+           top_address + output_frame_offset, output_frame_offset, value);
+  }
+
   output_frame_offset -= kPointerSize;
-  output_frame->SetFrameSlot(output_frame_offset, caller_arg_count);
-
   value = frame_ptr - (output_frame_size - output_frame_offset) -
-      StandardFrameConstants::kMarkerOffset;
-  output_frame_offset -= kPointerSize;
+      StandardFrameConstants::kMarkerOffset + kPointerSize;
   output_frame->SetFrameSlot(output_frame_offset, value);
+  if (trace_) {
+    PrintF("    0x%08x: [top + %d] <- 0x%08x ; args*\n",
+           top_address + output_frame_offset, output_frame_offset, value);
+  }
 
   // Copy the register parameters to the failure frame.
   for (int i = 0; i < descriptor->register_param_count_; ++i) {
     output_frame_offset -= kPointerSize;
     DoTranslateCommand(iterator, 0, output_frame_offset);
   }
 
+  ASSERT(0 == output_frame_offset);
+
   for (int i = 0; i < DwVfpRegister::kMaxNumRegisters; ++i) {
     double double_value = input_->GetDoubleRegister(i);
     output_frame->SetDoubleRegister(i, double_value);
   }
 
-  output_frame->SetRegister(fp.code(), frame_ptr);
-  output_frame->SetFp(frame_ptr);
-
   ApiFunction function(descriptor->deoptimization_handler_);
   ExternalReference xref(&function, ExternalReference::BUILTIN_CALL, isolate_);
   intptr_t handler = reinterpret_cast<intptr_t>(xref.address());
   int params = descriptor->register_param_count_;
   if (descriptor->stack_parameter_count_ != NULL) {
     params++;
   }
   output_frame->SetRegister(r0.code(), params);
   output_frame->SetRegister(r1.code(), handler);
+
+  // Compute this frame's PC, state, and continuation.
+  Code* trampoline = NULL;
+  int extra = descriptor->extra_expression_stack_count_;
+  StubFailureTrampolineStub(extra).FindCodeInCache(&trampoline, isolate_);
+  ASSERT(trampoline != NULL);
+  output_frame->SetPc(reinterpret_cast<intptr_t>(
+      trampoline->instruction_start()));
+  output_frame->SetState(Smi::FromInt(FullCodeGenerator::NO_REGISTERS));
+  Code* notify_failure =
+      isolate_->builtins()->builtin(Builtins::kNotifyStubFailure);
+  output_frame->SetContinuation(
+      reinterpret_cast<intptr_t>(notify_failure->entry()));
 }
 
 
 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;
@@ skipping 668 matching lines @@
     __ push(ip);
     __ b(&done);
     ASSERT(masm()->pc_offset() - start == table_entry_size_);
   }
   __ bind(&done);
 }
 
 #undef __
 
 } }  // namespace v8::internal