[turbofan] reduce allocations outside of pipeline

src/compiler/linkage.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/linkage.h"
 
 #include "src/code-stubs.h"
 #include "src/compiler.h"
 #include "src/compiler/node.h"
 #include "src/compiler/pipeline.h"
@@ skipping 21 matching lines @@
 
 
 std::ostream& operator<<(std::ostream& os, const CallDescriptor& d) {
   // TODO(svenpanne) Output properties etc. and be less cryptic.
   return os << d.kind() << ":" << d.debug_name() << ":r" << d.ReturnCount()
             << "j" << d.JSParameterCount() << "i" << d.InputCount() << "f"
             << d.FrameStateCount();
 }
 
 
-Linkage::Linkage(CompilationInfo* info) : info_(info) {
+CallDescriptor* Linkage::ComputeIncoming(Zone* zone, CompilationInfo* info) {
   if (info->function() != NULL) {
     // If we already have the function literal, use the number of parameters
     // plus the receiver.
-    incoming_ = GetJSCallDescriptor(1 + info->function()->parameter_count());
-  } else if (!info->closure().is_null()) {
+    return GetJSCallDescriptor(1 + info->function()->parameter_count(), zone);
+  }
+  if (!info->closure().is_null()) {
     // If we are compiling a JS function, use a JS call descriptor,
     // plus the receiver.
     SharedFunctionInfo* shared = info->closure()->shared();
-    incoming_ = GetJSCallDescriptor(1 + shared->formal_parameter_count());
-  } else if (info->code_stub() != NULL) {
+    return GetJSCallDescriptor(1 + shared->formal_parameter_count(), zone);
+  }
+  if (info->code_stub() != NULL) {
     // Use the code stub interface descriptor.
     CallInterfaceDescriptor descriptor =
         info->code_stub()->GetCallInterfaceDescriptor();
-    incoming_ = GetStubCallDescriptor(descriptor);
-  } else {
-    incoming_ = NULL;  // TODO(titzer): ?
+    return GetStubCallDescriptor(descriptor, 0, CallDescriptor::kNoFlags, zone);
   }
+  return NULL;  // TODO(titzer): ?
 }
 
 
-FrameOffset Linkage::GetFrameOffset(int spill_slot, Frame* frame, int extra) {
+FrameOffset Linkage::GetFrameOffset(int spill_slot, Frame* frame,
+                                    int extra) const {
   if (frame->GetSpillSlotCount() > 0 || incoming_->IsJSFunctionCall() ||
       incoming_->kind() == CallDescriptor::kCallAddress) {
     int offset;
     int register_save_area_size = frame->GetRegisterSaveAreaSize();
     if (spill_slot >= 0) {
       // Local or spill slot. Skip the frame pointer, function, and
       // context in the fixed part of the frame.
       offset =
           -(spill_slot + 1) * kPointerSize - register_save_area_size + extra;
     } else {
       // Incoming parameter. Skip the return address.
       offset = -(spill_slot + 1) * kPointerSize + kFPOnStackSize +
                kPCOnStackSize + extra;
     }
     return FrameOffset::FromFramePointer(offset);
   } else {
     // No frame. Retrieve all parameters relative to stack pointer.
     DCHECK(spill_slot < 0);  // Must be a parameter.
     int register_save_area_size = frame->GetRegisterSaveAreaSize();
     int offset = register_save_area_size - (spill_slot + 1) * kPointerSize +
                  kPCOnStackSize + extra;
     return FrameOffset::FromStackPointer(offset);
   }
 }
 
 
-CallDescriptor* Linkage::GetJSCallDescriptor(int parameter_count) {
-  return GetJSCallDescriptor(parameter_count, this->info_->zone());
+CallDescriptor* Linkage::GetJSCallDescriptor(int parameter_count) const {
+  return GetJSCallDescriptor(parameter_count, zone_);
 }
 
 
 CallDescriptor* Linkage::GetRuntimeCallDescriptor(
     Runtime::FunctionId function, int parameter_count,
-    Operator::Properties properties) {
-  return GetRuntimeCallDescriptor(function, parameter_count, properties,
-                                  this->info_->zone());
+    Operator::Properties properties) const {
+  return GetRuntimeCallDescriptor(function, parameter_count, properties, zone_);
 }
 
 
 CallDescriptor* Linkage::GetStubCallDescriptor(
     CallInterfaceDescriptor descriptor, int stack_parameter_count,
-    CallDescriptor::Flags flags) {
-  return GetStubCallDescriptor(descriptor, stack_parameter_count, flags,
-                               this->info_->zone());
+    CallDescriptor::Flags flags) const {
+  return GetStubCallDescriptor(descriptor, stack_parameter_count, flags, zone_);
 }
 
 
 // static
 bool Linkage::NeedsFrameState(Runtime::FunctionId function) {
   if (!FLAG_turbo_deoptimization) {
     return false;
   }
   // TODO(jarin) At the moment, we only add frame state for
   // few chosen runtime functions.
@@ skipping 123 matching lines @@
 
 CallDescriptor* Linkage::GetSimplifiedCDescriptor(Zone* zone,
                                                   MachineSignature* sig) {
   UNIMPLEMENTED();
   return NULL;
 }
 #endif  // !V8_TURBOFAN_BACKEND
 }
 }
 }  // namespace v8::internal::compiler