[turbofan] Frame elision for code stubs

src/compiler/arm64/code-generator-arm64.cc

Index: src/compiler/arm64/code-generator-arm64.cc
diff --git a/src/compiler/arm64/code-generator-arm64.cc b/src/compiler/arm64/code-generator-arm64.cc
index 54fe76c3d1762889a3a703f040764614417431ac..e9393ff13dc275035f55cfe79e6e40f9730bb676 100644
--- a/src/compiler/arm64/code-generator-arm64.cc
+++ b/src/compiler/arm64/code-generator-arm64.cc
@@ -293,7 +293,7 @@ class OutOfLineRecordWrite final : public OutOfLineCode {
                                              : OMIT_REMEMBERED_SET;
     SaveFPRegsMode const save_fp_mode =
         frame()->DidAllocateDoubleRegisters() ? kSaveFPRegs : kDontSaveFPRegs;
-    if (!frame()->needs_frame()) {
+    if (!frame_access_state()->access_frame_with_fp()) {
       // We need to save and restore lr if the frame was elided.
       __ Push(lr);
     }
@@ -301,7 +301,7 @@ class OutOfLineRecordWrite final : public OutOfLineCode {
                          remembered_set_action, save_fp_mode);
     __ Add(scratch1_, object_, index_);
     __ CallStub(&stub);
-    if (!frame()->needs_frame()) {
+    if (!frame_access_state()->access_frame_with_fp()) {
       __ Pop(lr);
     }
   }
@@ -466,6 +466,15 @@ Condition FlagsConditionToCondition(FlagsCondition condition) {
     }                                                                       \
   } while (0)
 
+void CodeGenerator::AssembleDeconstructFrame() {
+  const CallDescriptor* descriptor = linkage()->GetIncomingDescriptor();
+  if (descriptor->IsCFunctionCall() || descriptor->UseNativeStack()) {
+    __ Mov(csp, fp);
+  } else {
+    __ Mov(jssp, fp);
+  }
+  __ Pop(fp, lr);
+}
 
 void CodeGenerator::AssembleDeconstructActivationRecord(int stack_param_delta) {
   int sp_slot_delta = TailCallFrameStackSlotDelta(stack_param_delta);
@@ -482,7 +491,7 @@ void CodeGenerator::AssemblePrepareTailCall(int stack_param_delta) {
     __ Claim(-sp_slot_delta);
     frame_access_state()->IncreaseSPDelta(-sp_slot_delta);
   }
-  if (frame()->needs_frame()) {
+  if (frame_access_state()->access_frame_with_fp()) {
     __ Ldr(lr, MemOperand(fp, StandardFrameConstants::kCallerPCOffset));
     __ Ldr(fp, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
   }
@@ -664,7 +673,7 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
       __ mov(i.OutputRegister(), fp);
       break;
     case kArchParentFramePointer:
-      if (frame_access_state()->frame()->needs_frame()) {
+      if (frame_access_state()->access_frame_with_fp()) {
         __ ldr(i.OutputRegister(), MemOperand(fp, 0));
       } else {
         __ mov(i.OutputRegister(), fp);
@@ -1407,6 +1416,7 @@ void CodeGenerator::AssembleArchBranch(Instruction* instr, BranchInfo* branch) {
 
 
 void CodeGenerator::AssembleArchJump(RpoNumber target) {
+  AssembleDeconstructFrameBetweenBlocks();
   if (!IsNextInAssemblyOrder(target)) __ B(GetLabel(target));
 }
 
@@ -1464,12 +1474,18 @@ void CodeGenerator::AssembleDeoptimizerCall(
   __ Call(deopt_entry, RelocInfo::RUNTIME_ENTRY);
 }
 
+void CodeGenerator::SetupStackPointer() {
+  if (linkage()->GetIncomingDescriptor()->UseNativeStack()) {
+    __ SetStackPointer(csp);
+  } else {
+    __ SetStackPointer(jssp);
+  }
+}
 
 void CodeGenerator::AssemblePrologue() {
   CallDescriptor* descriptor = linkage()->GetIncomingDescriptor();
-  frame()->AlignFrame(16);
   int stack_shrink_slots = frame()->GetSpillSlotCount();
-  if (frame()->needs_frame()) {
+  if (frame_access_state()->access_frame_with_fp()) {
     if (descriptor->IsJSFunctionCall()) {
       DCHECK(!descriptor->UseNativeStack());
       __ SetStackPointer(jssp);
@@ -1489,15 +1505,8 @@ void CodeGenerator::AssemblePrologue() {
                         frame()->GetTotalFrameSlotCount());
       }
     }
-  } else {
-    if (descriptor->UseNativeStack()) {
-      __ SetStackPointer(csp);
-    } else {
-      __ SetStackPointer(jssp);
-    }
-    frame()->SetElidedFrameSizeInSlots(0);
   }
-  frame_access_state()->SetFrameAccessToDefault();
+
   if (info()->is_osr()) {
     // TurboFan OSR-compiled functions cannot be entered directly.
     __ Abort(kShouldNotDirectlyEnterOsrFunction);
@@ -1558,22 +1567,16 @@ void CodeGenerator::AssembleReturn() {
 
   int pop_count = static_cast<int>(descriptor->StackParameterCount());
   if (descriptor->IsCFunctionCall()) {
-    __ Mov(csp, fp);
-    __ Pop(fp, lr);
-  } else if (frame()->needs_frame()) {
+    AssembleDeconstructFrameWhenLeaving();
+  } else if (frame_access_state()->access_frame_with_fp()) {
     // Canonicalize JSFunction return sites for now.
     if (return_label_.is_bound()) {
+      AssembleDeconstructFrameBetweenBlocks();
       __ B(&return_label_);
       return;
     } else {
       __ Bind(&return_label_);
-      if (descriptor->UseNativeStack()) {
-        __ Mov(csp, fp);
-        pop_count += (pop_count & 1);  // align
-      } else {
-        __ Mov(jssp, fp);
-      }
-      __ Pop(fp, lr);
+      AssembleDeconstructFrameWhenLeaving();
     }
   } else if (descriptor->UseNativeStack()) {
     pop_count += (pop_count & 1);  // align