[turbofan] regalloc: model context and function mark as reg-defined.

src/compiler/register-allocator.h

Index: src/compiler/register-allocator.h
diff --git a/src/compiler/register-allocator.h b/src/compiler/register-allocator.h
index 9032fde224ec8175e1217a71eefa9cdfcf34cb0c..394d1deb7413a6e810f320589ff019cfb91c39a1 100644
--- a/src/compiler/register-allocator.h
+++ b/src/compiler/register-allocator.h
@@ -670,6 +670,7 @@ class SpillRange final : public ZoneObject {
   int ByteWidth() const;
   bool IsEmpty() const { return live_ranges_.empty(); }
   bool TryMerge(SpillRange* other);
+  bool HasSlot() const { return assigned_slot_ != kUnassignedSlot; }
 
   void set_assigned_slot(int index) {
     DCHECK_EQ(kUnassignedSlot, assigned_slot_);
@@ -802,6 +803,10 @@ class RegisterAllocationData final : public ZoneObject {
   PhiMapValue* GetPhiMapValueFor(int virtual_register);
   bool IsBlockBoundary(LifetimePosition pos) const;
 
+  ZoneMap<TopLevelLiveRange*, int>& preassigned_slot_ranges() {
+    return preassigned_slot_ranges_;
+  }
+
   void Print(const InstructionSequence* instructionSequence);
   void Print(const Instruction* instruction);
   void Print(const LiveRange* range, bool with_children = false);
@@ -830,6 +835,7 @@ class RegisterAllocationData final : public ZoneObject {
   BitVector* assigned_registers_;
   BitVector* assigned_double_registers_;
   int virtual_register_count_;
+  ZoneMap<TopLevelLiveRange*, int> preassigned_slot_ranges_;

[Jarin, 2015/12/10 18:32:59]

Why is this a ZoneMap? A simple vector of pairs should be sufficient. 

[Mircea Trofin, 2015/12/11 02:17:18]

Duh. Thanks for the catch! Fixed.

 
   DISALLOW_COPY_AND_ASSIGN(RegisterAllocationData);
 };