Use the virtual-frame based optimizing compiler for split-compilation...

src/x64/codegen-x64.cc

Index: src/x64/codegen-x64.cc
===================================================================
--- src/x64/codegen-x64.cc	(revision 3775)
+++ src/x64/codegen-x64.cc	(working copy)
@@ -278,7 +278,9 @@
 }
 
 
-void CodeGenerator::GenCode(FunctionLiteral* function, CompilationInfo* info) {
+void CodeGenerator::Generate(FunctionLiteral* function,
+                             Mode mode,
+                             CompilationInfo* info) {
   // Record the position for debugging purposes.
   CodeForFunctionPosition(function);
   ZoneList<Statement*>* body = function->body();
@@ -318,96 +320,106 @@
     // rdi: called JS function
     // rsi: callee's context
     allocator_->Initialize();
-    frame_->Enter();
 
-    // Allocate space for locals and initialize them.
-    frame_->AllocateStackSlots();
-    // Initialize the function return target after the locals are set
-    // up, because it needs the expected frame height from the frame.
-    function_return_.set_direction(JumpTarget::BIDIRECTIONAL);
-    function_return_is_shadowed_ = false;
+    if (mode == PRIMARY) {
+      frame_->Enter();
 
-    // Allocate the local context if needed.
-    int heap_slots = scope_->num_heap_slots();
-    if (heap_slots > 0) {
-      Comment cmnt(masm_, "[ allocate local context");
-      // Allocate local context.
-      // Get outer context and create a new context based on it.
-      frame_->PushFunction();
-      Result context;
-      if (heap_slots <= FastNewContextStub::kMaximumSlots) {
-        FastNewContextStub stub(heap_slots);
-        context = frame_->CallStub(&stub, 1);
-      } else {
-        context = frame_->CallRuntime(Runtime::kNewContext, 1);
-      }
+      // Allocate space for locals and initialize them.
+      frame_->AllocateStackSlots();
 
-      // Update context local.
-      frame_->SaveContextRegister();
+      // Allocate the local context if needed.
+      int heap_slots = scope_->num_heap_slots();
+      if (heap_slots > 0) {
+        Comment cmnt(masm_, "[ allocate local context");
+        // Allocate local context.
+        // Get outer context and create a new context based on it.
+        frame_->PushFunction();
+        Result context;
+        if (heap_slots <= FastNewContextStub::kMaximumSlots) {
+          FastNewContextStub stub(heap_slots);
+          context = frame_->CallStub(&stub, 1);
+        } else {
+          context = frame_->CallRuntime(Runtime::kNewContext, 1);
+        }
 
-      // Verify that the runtime call result and rsi agree.
-      if (FLAG_debug_code) {
-        __ cmpq(context.reg(), rsi);
-        __ Assert(equal, "Runtime::NewContext should end up in rsi");
+        // Update context local.
+        frame_->SaveContextRegister();
+
+        // Verify that the runtime call result and rsi agree.
+        if (FLAG_debug_code) {
+          __ cmpq(context.reg(), rsi);
+          __ Assert(equal, "Runtime::NewContext should end up in rsi");
+        }
       }
-    }
 
-    // TODO(1241774): Improve this code:
-    // 1) only needed if we have a context
-    // 2) no need to recompute context ptr every single time
-    // 3) don't copy parameter operand code from SlotOperand!
-    {
-      Comment cmnt2(masm_, "[ copy context parameters into .context");
+      // TODO(1241774): Improve this code:
+      // 1) only needed if we have a context
+      // 2) no need to recompute context ptr every single time
+      // 3) don't copy parameter operand code from SlotOperand!
+      {
+        Comment cmnt2(masm_, "[ copy context parameters into .context");
 
-      // Note that iteration order is relevant here! If we have the same
-      // parameter twice (e.g., function (x, y, x)), and that parameter
-      // needs to be copied into the context, it must be the last argument
-      // passed to the parameter that needs to be copied. This is a rare
-      // case so we don't check for it, instead we rely on the copying
-      // order: such a parameter is copied repeatedly into the same
-      // context location and thus the last value is what is seen inside
-      // the function.
-      for (int i = 0; i < scope_->num_parameters(); i++) {
-        Variable* par = scope_->parameter(i);
-        Slot* slot = par->slot();
-        if (slot != NULL && slot->type() == Slot::CONTEXT) {
-          // The use of SlotOperand below is safe in unspilled code
-          // because the slot is guaranteed to be a context slot.
-          //
-          // There are no parameters in the global scope.
-          ASSERT(!scope_->is_global_scope());
-          frame_->PushParameterAt(i);
-          Result value = frame_->Pop();
-          value.ToRegister();
+        // Note that iteration order is relevant here! If we have the same
+        // parameter twice (e.g., function (x, y, x)), and that parameter
+        // needs to be copied into the context, it must be the last argument
+        // passed to the parameter that needs to be copied. This is a rare
+        // case so we don't check for it, instead we rely on the copying
+        // order: such a parameter is copied repeatedly into the same
+        // context location and thus the last value is what is seen inside
+        // the function.
+        for (int i = 0; i < scope_->num_parameters(); i++) {
+          Variable* par = scope_->parameter(i);
+          Slot* slot = par->slot();
+          if (slot != NULL && slot->type() == Slot::CONTEXT) {
+            // The use of SlotOperand below is safe in unspilled code
+            // because the slot is guaranteed to be a context slot.
+            //
+            // There are no parameters in the global scope.
+            ASSERT(!scope_->is_global_scope());
+            frame_->PushParameterAt(i);
+            Result value = frame_->Pop();
+            value.ToRegister();
 
-          // SlotOperand loads context.reg() with the context object
-          // stored to, used below in RecordWrite.
-          Result context = allocator_->Allocate();
-          ASSERT(context.is_valid());
-          __ movq(SlotOperand(slot, context.reg()), value.reg());
-          int offset = FixedArray::kHeaderSize + slot->index() * kPointerSize;
-          Result scratch = allocator_->Allocate();
-          ASSERT(scratch.is_valid());
-          frame_->Spill(context.reg());
-          frame_->Spill(value.reg());
-          __ RecordWrite(context.reg(), offset, value.reg(), scratch.reg());
+            // SlotOperand loads context.reg() with the context object
+            // stored to, used below in RecordWrite.
+            Result context = allocator_->Allocate();
+            ASSERT(context.is_valid());
+            __ movq(SlotOperand(slot, context.reg()), value.reg());
+            int offset = FixedArray::kHeaderSize + slot->index() * kPointerSize;
+            Result scratch = allocator_->Allocate();
+            ASSERT(scratch.is_valid());
+            frame_->Spill(context.reg());
+            frame_->Spill(value.reg());
+            __ RecordWrite(context.reg(), offset, value.reg(), scratch.reg());
+          }
         }
       }
-    }
 
-    // Store the arguments object.  This must happen after context
-    // initialization because the arguments object may be stored in
-    // the context.
-    if (ArgumentsMode() != NO_ARGUMENTS_ALLOCATION) {
-      StoreArgumentsObject(true);
-    }
+      // Store the arguments object.  This must happen after context
+      // initialization because the arguments object may be stored in
+      // the context.
+      if (ArgumentsMode() != NO_ARGUMENTS_ALLOCATION) {
+        StoreArgumentsObject(true);
+      }
 
-    // Initialize ThisFunction reference if present.
-    if (scope_->is_function_scope() && scope_->function() != NULL) {
-      frame_->Push(Factory::the_hole_value());
-      StoreToSlot(scope_->function()->slot(), NOT_CONST_INIT);
+      // Initialize ThisFunction reference if present.
+      if (scope_->is_function_scope() && scope_->function() != NULL) {
+        frame_->Push(Factory::the_hole_value());
+        StoreToSlot(scope_->function()->slot(), NOT_CONST_INIT);
+      }
+    } else {
+      // When used as the secondary compiler for splitting, rbp, rsi,
+      // and rdi have been pushed on the stack.  Adjust the virtual
+      // frame to match this state.
+      frame_->Adjust(3);
+      allocator_->Unuse(rdi);
     }
 
+    // Initialize the function return target after the locals are set
+    // up, because it needs the expected frame height from the frame.
+    function_return_.set_direction(JumpTarget::BIDIRECTIONAL);
+    function_return_is_shadowed_ = false;
+
     // Generate code to 'execute' declarations and initialize functions
     // (source elements). In case of an illegal redeclaration we need to
     // handle that instead of processing the declarations.