Removed loop depth info tracking at graph build time.

runtime/vm/intermediate_language.h

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_INTERMEDIATE_LANGUAGE_H_
 #define VM_INTERMEDIATE_LANGUAGE_H_
 
 #include "vm/allocation.h"
 #include "vm/ast.h"
 #include "vm/growable_array.h"
@@ skipping 638 matching lines @@
 };
 
 
 // Basic block entries are administrative nodes.  There is a distinguished
 // graph entry with no predecessor.  Joins are the only nodes with multiple
 // predecessors.  Targets are all other basic block entries.  The types
 // enforce edge-split form---joins are forbidden as the successors of
 // branches.
 class BlockEntryInstr : public Instruction {
  public:
-  static const intptr_t kInvalidLoopDepth = -1;
-
   virtual BlockEntryInstr* AsBlockEntry() { return this; }
 
   virtual intptr_t PredecessorCount() const = 0;
   virtual BlockEntryInstr* PredecessorAt(intptr_t index) const = 0;
   virtual void PrepareEntry(FlowGraphCompiler* compiler) = 0;
 
   intptr_t preorder_number() const { return preorder_number_; }
   void set_preorder_number(intptr_t number) { preorder_number_ = number; }
 
   intptr_t postorder_number() const { return postorder_number_; }
@@ skipping 73 matching lines @@
 
   virtual bool HasSideEffect() const { return false; }
 
   intptr_t try_index() const { return try_index_; }
 
   BitVector* loop_info() const { return loop_info_; }
   void set_loop_info(BitVector* loop_info) {
     loop_info_ = loop_info;
   }
 
-  intptr_t loop_depth() const { return loop_depth_; }
-  void set_loop_depth(intptr_t loop_depth) {
-    ASSERT(loop_depth_ == kInvalidLoopDepth);
-    ASSERT(loop_depth != kInvalidLoopDepth);
-    loop_depth_ = loop_depth;
-  }
-
   virtual BlockEntryInstr* GetBlock() const {
     return const_cast<BlockEntryInstr*>(this);
   }
 
  protected:
-  BlockEntryInstr(intptr_t block_id, intptr_t try_index, intptr_t loop_depth)
+  BlockEntryInstr(intptr_t block_id, intptr_t try_index)
       : block_id_(block_id),
         try_index_(try_index),
         preorder_number_(-1),
         postorder_number_(-1),
         dominator_(NULL),
         dominated_blocks_(1),
         last_instruction_(NULL),
         parallel_move_(NULL),
-        loop_info_(NULL),
-        loop_depth_(loop_depth) { }
+        loop_info_(NULL) { }
 
  private:
   virtual void ClearPredecessors() = 0;
   virtual void AddPredecessor(BlockEntryInstr* predecessor) = 0;
 
   const intptr_t block_id_;
   const intptr_t try_index_;
   intptr_t preorder_number_;
   intptr_t postorder_number_;
   // Starting and ending lifetime positions for this block.  Used by
   // the linear scan register allocator.
   intptr_t start_pos_;
   intptr_t end_pos_;
   BlockEntryInstr* dominator_;  // Immediate dominator, NULL for graph entry.
   // TODO(fschneider): Optimize the case of one child to save space.
   GrowableArray<BlockEntryInstr*> dominated_blocks_;
   Instruction* last_instruction_;
 
   // Parallel move that will be used by linear scan register allocator to
   // connect live ranges at the start of the block.
   ParallelMoveInstr* parallel_move_;
 
   // Bit vector containg loop blocks for a loop header indexed by block
   // preorder number.
   BitVector* loop_info_;
 
-  // Syntactic loop depth of the block.
-  intptr_t loop_depth_;
-
   DISALLOW_COPY_AND_ASSIGN(BlockEntryInstr);
 };
 
 
 class ForwardInstructionIterator : public ValueObject {
  public:
   explicit ForwardInstructionIterator(BlockEntryInstr* block_entry)
       : block_entry_(block_entry), current_(block_entry) {
     Advance();
   }
@@ skipping 83 matching lines @@
   GrowableArray<TargetEntryInstr*> catch_entries_;
   GrowableArray<Definition*> initial_definitions_;
   intptr_t spill_slot_count_;
 
   DISALLOW_COPY_AND_ASSIGN(GraphEntryInstr);
 };
 
 
 class JoinEntryInstr : public BlockEntryInstr {
  public:
-  JoinEntryInstr(intptr_t block_id, intptr_t try_index, intptr_t loop_depth)
-      : BlockEntryInstr(block_id, try_index, loop_depth),
+  JoinEntryInstr(intptr_t block_id, intptr_t try_index)
+      : BlockEntryInstr(block_id, try_index),
         predecessors_(2),  // Two is the assumed to be the common case.
         phis_(NULL),
         phi_count_(0) { }
 
   DECLARE_INSTRUCTION(JoinEntry)
 
   virtual intptr_t PredecessorCount() const { return predecessors_.length(); }
   virtual BlockEntryInstr* PredecessorAt(intptr_t index) const {
     return predecessors_[index];
   }
@@ skipping 50 matching lines @@
   }
 
  private:
   ZoneGrowableArray<PhiInstr*>* phis_;
   intptr_t index_;
 };
 
 
 class TargetEntryInstr : public BlockEntryInstr {
  public:
-  TargetEntryInstr(intptr_t block_id, intptr_t try_index, intptr_t loop_depth)
-      : BlockEntryInstr(block_id, try_index, loop_depth),
+  TargetEntryInstr(intptr_t block_id, intptr_t try_index)
+      : BlockEntryInstr(block_id, try_index),
         predecessor_(NULL),
         catch_try_index_(CatchClauseNode::kInvalidTryIndex),
         catch_handler_types_(Array::ZoneHandle()) { }
 
   DECLARE_INSTRUCTION(TargetEntry)
 
   virtual intptr_t PredecessorCount() const {
     return (predecessor_ == NULL) ? 0 : 1;
   }
   virtual BlockEntryInstr* PredecessorAt(intptr_t index) const {
@@ skipping 3465 matching lines @@
   ForwardInstructionIterator* current_iterator_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(FlowGraphVisitor);
 };
 
 
 }  // namespace dart
 
 #endif  // VM_INTERMEDIATE_LANGUAGE_H_