Remove some dead code.

src/ast.h

Index: src/ast.h
diff --git a/src/ast.h b/src/ast.h
index d8bc18e27829907ad37de2c6a50f94e17d547920..6c4a610422182a319d2bcd184d9c59f45ecf93c4 100644
--- a/src/ast.h
+++ b/src/ast.h
@@ -31,7 +31,6 @@
 #include "execution.h"
 #include "factory.h"
 #include "jsregexp.h"
-#include "jump-target.h"
 #include "runtime.h"
 #include "token.h"
 #include "variables.h"
@@ -220,7 +219,7 @@ class Expression: public AstNode {
     kTest
   };
 
-  Expression() : bitfields_(0) {}
+  Expression() {}
 
   virtual Expression* AsExpression()  { return this; }
 
@@ -266,70 +265,9 @@ class Expression: public AstNode {
     return Handle<Map>();
   }
 
-  // Static type information for this expression.
-  StaticType* type() { return &type_; }
-
-  // True if the expression is a loop condition.
-  bool is_loop_condition() const {
-    return LoopConditionField::decode(bitfields_);
-  }
-  void set_is_loop_condition(bool flag) {
-    bitfields_ = (bitfields_ & ~LoopConditionField::mask()) |
-        LoopConditionField::encode(flag);
-  }
-
   // The value of the expression is guaranteed to be a smi, because the
   // top operation is a bit operation with a mask, or a shift.
   bool GuaranteedSmiResult();
-
-  // AST analysis results.
-  void CopyAnalysisResultsFrom(Expression* other);
-
-  // True if the expression rooted at this node can be compiled by the
-  // side-effect free compiler.
-  bool side_effect_free() { return SideEffectFreeField::decode(bitfields_); }
-  void set_side_effect_free(bool is_side_effect_free) {
-    bitfields_ &= ~SideEffectFreeField::mask();
-    bitfields_ |= SideEffectFreeField::encode(is_side_effect_free);
-  }
-
-  // Will the use of this expression treat -0 the same as 0 in all cases?
-  // If so, we can return 0 instead of -0 if we want to, to optimize code.
-  bool no_negative_zero() { return NoNegativeZeroField::decode(bitfields_); }
-  void set_no_negative_zero(bool no_negative_zero) {
-    bitfields_ &= ~NoNegativeZeroField::mask();
-    bitfields_ |= NoNegativeZeroField::encode(no_negative_zero);
-  }
-
-  // Will ToInt32 (ECMA 262-3 9.5) or ToUint32 (ECMA 262-3 9.6)
-  // be applied to the value of this expression?
-  // If so, we may be able to optimize the calculation of the value.
-  bool to_int32() { return ToInt32Field::decode(bitfields_); }
-  void set_to_int32(bool to_int32) {
-    bitfields_ &= ~ToInt32Field::mask();
-    bitfields_ |= ToInt32Field::encode(to_int32);
-  }
-
-  // How many bitwise logical or shift operators are used in this expression?
-  int num_bit_ops() { return NumBitOpsField::decode(bitfields_); }
-  void set_num_bit_ops(int num_bit_ops) {
-    bitfields_ &= ~NumBitOpsField::mask();
-    num_bit_ops = Min(num_bit_ops, kMaxNumBitOps);
-    bitfields_ |= NumBitOpsField::encode(num_bit_ops);
-  }
-
- private:
-  static const int kMaxNumBitOps = (1 << 5) - 1;
-
-  uint32_t bitfields_;
-  StaticType type_;
-
-  // Using template BitField<type, start, size>.
-  class SideEffectFreeField : public BitField<bool, 0, 1> {};
-  class NoNegativeZeroField : public BitField<bool, 1, 1> {};
-  class ToInt32Field : public BitField<bool, 2, 1> {};
-  class NumBitOpsField : public BitField<int, 3, 5> {};
-  class LoopConditionField: public BitField<bool, 8, 1> {};
 };
 
 
@@ -360,7 +298,7 @@ class BreakableStatement: public Statement {
   virtual BreakableStatement* AsBreakableStatement() { return this; }
 
   // Code generation
-  BreakTarget* break_target() { return &break_target_; }
+  Label* break_target() { return &break_target_; }
 
   // Testers.
   bool is_target_for_anonymous() const { return type_ == TARGET_FOR_ANONYMOUS; }
@@ -375,7 +313,7 @@ class BreakableStatement: public Statement {
  private:
   ZoneStringList* labels_;
   Type type_;
-  BreakTarget break_target_;
+  Label break_target_;
   int entry_id_;
   int exit_id_;
 };
@@ -446,7 +384,7 @@ class IterationStatement: public BreakableStatement {
   virtual int ContinueId() const = 0;
 
   // Code generation
-  BreakTarget* continue_target()  { return &continue_target_; }
+  Label* continue_target()  { return &continue_target_; }
 
  protected:
   explicit inline IterationStatement(ZoneStringList* labels);
@@ -457,7 +395,7 @@ class IterationStatement: public BreakableStatement {
 
  private:
   Statement* body_;
-  BreakTarget continue_target_;
+  Label continue_target_;
   int osr_entry_id_;
 };
 
@@ -693,7 +631,7 @@ class CaseClause: public ZoneObject {
     CHECK(!is_default());
     return label_;
   }
-  JumpTarget* body_target() { return &body_target_; }
+  Label* body_target() { return &body_target_; }
   ZoneList<Statement*>* statements() const { return statements_; }
 
   int position() { return position_; }
@@ -708,7 +646,7 @@ class CaseClause: public ZoneObject {
 
  private:
   Expression* label_;
-  JumpTarget body_target_;
+  Label body_target_;
   ZoneList<Statement*>* statements_;
   int position_;
   enum CompareTypeFeedback { NONE, SMI_ONLY, OBJECT_ONLY };
@@ -781,23 +719,23 @@ class IfStatement: public Statement {
 // stack in the compiler; this should probably be reworked.
 class TargetCollector: public AstNode {
  public:
-  explicit TargetCollector(ZoneList<BreakTarget*>* targets)
+  explicit TargetCollector(ZoneList<Label*>* targets)
       : targets_(targets) {
   }
 
   // Adds a jump target to the collector. The collector stores a pointer not
   // a copy of the target to make binding work, so make sure not to pass in
   // references to something on the stack.
-  void AddTarget(BreakTarget* target);
+  void AddTarget(Label* target);
 
   // Virtual behaviour. TargetCollectors are never part of the AST.
   virtual void Accept(AstVisitor* v) { UNREACHABLE(); }
   virtual TargetCollector* AsTargetCollector() { return this; }
 
-  ZoneList<BreakTarget*>* targets() { return targets_; }
+  ZoneList<Label*>* targets() { return targets_; }
 
  private:
-  ZoneList<BreakTarget*>* targets_;
+  ZoneList<Label*>* targets_;
 };
 
 
@@ -806,16 +744,16 @@ class TryStatement: public Statement {
   explicit TryStatement(Block* try_block)
       : try_block_(try_block), escaping_targets_(NULL) { }
 
-  void set_escaping_targets(ZoneList<BreakTarget*>* targets) {
+  void set_escaping_targets(ZoneList<Label*>* targets) {
     escaping_targets_ = targets;
   }
 
   Block* try_block() const { return try_block_; }
-  ZoneList<BreakTarget*>* escaping_targets() const { return escaping_targets_; }
+  ZoneList<Label*>* escaping_targets() const { return escaping_targets_; }
 
  private:
   Block* try_block_;
-  ZoneList<BreakTarget*>* escaping_targets_;
+  ZoneList<Label*>* escaping_targets_;
 };