[turbofan] Add general support for sp-based frame access

src/compiler/frame.cc

Index: src/compiler/frame.cc
diff --git a/src/compiler/frame.cc b/src/compiler/frame.cc
index 7b9a797f5a4d45345233870f49a27c284569bfbf..64ef5ed102f5b7176eb1836d34cfed9685c4c1a5 100644
--- a/src/compiler/frame.cc
+++ b/src/compiler/frame.cc
@@ -12,14 +12,41 @@ namespace v8 {
 namespace internal {
 namespace compiler {
 
-Frame::Frame(int fixed_frame_size_in_slots)
-    : frame_slot_count_(fixed_frame_size_in_slots),
-      outgoing_parameter_slot_count_(0),
+Frame::Frame(int fixed_frame_size_in_slots, const CallDescriptor* descriptor)
+    : needs_frame_((descriptor != nullptr) &&
+                   descriptor->RequiresFrameAsIncoming()),
+      frame_slot_count_(fixed_frame_size_in_slots),
       callee_saved_slot_count_(0),
       spill_slot_count_(0),
       allocated_registers_(NULL),
       allocated_double_registers_(NULL) {}
 
+
+void FrameAccessState::SetFrameAccessToDefault() {
+  if (frame()->needs_frame() && !FLAG_turbo_sp_frame_access) {
+    SetFrameAccessToFP();
+  } else {
+    SetFrameAccessToSP();
+  }
+}
+
+
+FrameOffset FrameAccessState::GetFrameOffset(int spill_slot) const {
+  const int offset =
+      (StandardFrameConstants::kFixedSlotCountAboveFp - spill_slot - 1) *
+      kPointerSize;
+  if (access_frame_with_fp()) {
+    DCHECK(frame()->needs_frame());
+    return FrameOffset::FromFramePointer(offset);
+  } else {
+    // No frame. Retrieve all parameters relative to stack pointer.
+    int sp_offset =
+        offset + ((frame()->GetSpToFpSlotCount() + sp_delta()) * kPointerSize);
+    return FrameOffset::FromStackPointer(sp_offset);
+  }
+}
+
+
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8