Initial (stub) port of jump targets to the ARM platform....

src/codegen-arm.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 25 matching lines @@
 class DeferredCode;
 
 // Mode to overwrite BinaryExpression values.
 enum OverwriteMode { NO_OVERWRITE, OVERWRITE_LEFT, OVERWRITE_RIGHT };
 
 enum InitState { CONST_INIT, NOT_CONST_INIT };
 enum TypeofState { INSIDE_TYPEOF, NOT_INSIDE_TYPEOF };
 
 
 // -------------------------------------------------------------------------
-// Virtual frame
-
-class VirtualFrame BASE_EMBEDDED {
- public:
-  explicit VirtualFrame(CodeGenerator* cgen);
-
-  MemOperand Top() const { return MemOperand(sp, 0); }
-
-  MemOperand Element(int index) const {
-    return MemOperand(sp, index * kPointerSize);
-  }
-
-  MemOperand Local(int index) const {
-    ASSERT(0 <= index && index < frame_local_count_);
-    return MemOperand(fp, kLocal0Offset - index * kPointerSize);
-  }
-
-  MemOperand Function() const { return MemOperand(fp, kFunctionOffset); }
-
-  MemOperand Context() const { return MemOperand(fp, kContextOffset); }
-
-  MemOperand Parameter(int index) const {
-    // Index -1 corresponds to the receiver.
-    ASSERT(-1 <= index && index <= parameter_count_);
-    return MemOperand(fp, (1 + parameter_count_ - index) * kPointerSize);
-  }
-
- private:
-  static const int kLocal0Offset = JavaScriptFrameConstants::kLocal0Offset;
-  static const int kFunctionOffset = JavaScriptFrameConstants::kFunctionOffset;
-  static const int kContextOffset = StandardFrameConstants::kContextOffset;
-
-  MacroAssembler* masm_;
-  int frame_local_count_;
-  int parameter_count_;
-};
-
-
-// -------------------------------------------------------------------------
 // Reference support
 
 // A reference is a C++ stack-allocated object that keeps an ECMA
 // reference on the execution stack while in scope. For variables
 // the reference is empty, indicating that it isn't necessary to
 // store state on the stack for keeping track of references to those.
 // For properties, we keep either one (named) or two (indexed) values
 // on the execution stack to represent the reference.
 
 class Reference BASE_EMBEDDED {
@@ skipping 50 matching lines @@
  public:
   // Create an initial code generator state.  Destroying the initial state
   // leaves the code generator with a NULL state.
   explicit CodeGenState(CodeGenerator* owner);
 
   // Create a code generator state based on a code generator's current
   // state.  The new state has its own typeof state and pair of branch
   // labels.
   CodeGenState(CodeGenerator* owner,
                TypeofState typeof_state,
-               Label* true_target,
-               Label* false_target);
+               JumpTarget* true_target,
+               JumpTarget* false_target);
 
   // Destroy a code generator state and restore the owning code generator's
   // previous state.
   ~CodeGenState();
 
   TypeofState typeof_state() const { return typeof_state_; }
-  Label* true_target() const { return true_target_; }
-  Label* false_target() const { return false_target_; }
+  JumpTarget* true_target() const { return true_target_; }
+  JumpTarget* false_target() const { return false_target_; }
 
  private:
   CodeGenerator* owner_;
   TypeofState typeof_state_;
-  Label* true_target_;
-  Label* false_target_;
+  JumpTarget* true_target_;
+  JumpTarget* false_target_;
   CodeGenState* previous_;
 };
 
 
 // -------------------------------------------------------------------------
 // CodeGenerator
 
 class CodeGenerator: public Visitor {
  public:
   // Takes a function literal, generates code for it. This function should only
@@ skipping 27 matching lines @@
   // Accessors
   Scope* scope() const { return scope_; }
 
   void ProcessDeferred();
 
   bool is_eval() { return is_eval_; }
 
   // State
   bool has_cc() const  { return cc_reg_ != al; }
   TypeofState typeof_state() const { return state_->typeof_state(); }
-  Label* true_target() const  { return state_->true_target(); }
-  Label* false_target() const  { return state_->false_target(); }
+  JumpTarget* true_target() const  { return state_->true_target(); }
+  JumpTarget* false_target() const  { return state_->false_target(); }
 
 
   // Node visitors.
 #define DEF_VISIT(type) \
   void Visit##type(type* node);
   NODE_LIST(DEF_VISIT)
 #undef DEF_VISIT
 
   // Main code generation function
   void GenCode(FunctionLiteral* fun);
 
   // The following are used by class Reference.
   void LoadReference(Reference* ref);
   void UnloadReference(Reference* ref);
 
   MemOperand ContextOperand(Register context, int index) const {
     return MemOperand(context, Context::SlotOffset(index));
   }
 
   MemOperand SlotOperand(Slot* slot, Register tmp);
 
   // Expressions
   MemOperand GlobalObject() const  {
     return ContextOperand(cp, Context::GLOBAL_INDEX);
   }
 
   void LoadCondition(Expression* x,
                      TypeofState typeof_state,
-                     Label* true_target,
-                     Label* false_target,
+                     JumpTarget* true_target,
+                     JumpTarget* false_target,
                      bool force_cc);
   void Load(Expression* x, TypeofState typeof_state = NOT_INSIDE_TYPEOF);
   void LoadGlobal();
   void LoadGlobalReceiver(Register scratch);
 
   // Read a value from a slot and leave it on top of the expression stack.
   void LoadFromSlot(Slot* slot, TypeofState typeof_state);
 
   // Special code for typeof expressions: Unfortunately, we must
   // be careful when loading the expression in 'typeof'
   // expressions. We are not allowed to throw reference errors for
   // non-existing properties of the global object, so we must make it
   // look like an explicit property access, instead of an access
   // through the context chain.
   void LoadTypeofExpression(Expression* x);
 
-  void ToBoolean(Label* true_target, Label* false_target);
+  void ToBoolean(JumpTarget* true_target, JumpTarget* false_target);
 
   void GenericBinaryOperation(Token::Value op);
   void Comparison(Condition cc, bool strict = false);
 
   void SmiOperation(Token::Value op, Handle<Object> value, bool reversed);
 
   void CallWithArguments(ZoneList<Expression*>* arguments, int position);
 
   // Control flow
-  void Branch(bool if_true, Label* L);
+  void Branch(bool if_true, JumpTarget* target);
   void CheckStack();
   void CleanStack(int num_bytes);
 
   bool CheckForInlineRuntimeCall(CallRuntime* node);
   Handle<JSFunction> BuildBoilerplate(FunctionLiteral* node);
   void ProcessDeclarations(ZoneList<Declaration*>* declarations);
 
   Handle<Code> ComputeCallInitialize(int argc);
 
   // Declare global variables and functions in the given array of
@@ skipping 46 matching lines @@
   // is optimal compared to the default code generated for a switch statement
   // on that platform.
   int FastCaseSwitchMinCaseCount();
 
   // Allocate a jump table and create code to jump through it.
   // Should call GenerateFastCaseSwitchCases to generate the code for
   // all the cases at the appropriate point.
   void GenerateFastCaseSwitchJumpTable(SwitchStatement* node,
                                        int min_index,
                                        int range,
-                                       Label* fail_label,
-                                       Vector<Label*> case_targets,
-                                       Vector<Label> case_labels);
+                                       JumpTarget* fail_label,
+                                       Vector<JumpTarget*> case_targets,
+                                       Vector<JumpTarget> case_labels);
 
   // Generate the code for cases for the fast case switch.
   // Called by GenerateFastCaseSwitchJumpTable.
   void GenerateFastCaseSwitchCases(SwitchStatement* node,
-                                   Vector<Label> case_labels);
+                                   Vector<JumpTarget> case_labels,
+                                   JumpTarget* table_start);
 
   // Fast support for constant-Smi switches.
   void GenerateFastCaseSwitchStatement(SwitchStatement* node,
                                        int min_index,
                                        int range,
                                        int default_index);
 
   // Fast support for constant-Smi switches. Tests whether switch statement
   // permits optimization and calls GenerateFastCaseSwitch if it does.
   // Returns true if the fast-case switch was generated, and false if not.
@@ skipping 18 matching lines @@
   MacroAssembler* masm_;  // to generate code
 
   // Code generation state
   Scope* scope_;
   VirtualFrame* frame_;
   Condition cc_reg_;
   CodeGenState* state_;
   bool is_inside_try_;
   int break_stack_height_;
 
-  // Labels
-  Label function_return_;
+  // Jump targets
+  JumpTarget function_return_;
 
   friend class VirtualFrame;
   friend class Reference;
 
   DISALLOW_COPY_AND_ASSIGN(CodeGenerator);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_CODEGEN_ARM_H_