v8/src/fast-codegen.h

// Copyright 2009 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
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#ifndef V8_FAST_CODEGEN_H_
#define V8_FAST_CODEGEN_H_

#include "v8.h"

#include "ast.h"

namespace v8 {
namespace internal {


class FastCodeGenerator: public AstVisitor {
 public:
  FastCodeGenerator(MacroAssembler* masm, Handle<Script> script, bool is_eval)
      : masm_(masm),
        function_(NULL),
        script_(script),
        is_eval_(is_eval),
        loop_depth_(0),
        true_label_(NULL),
        false_label_(NULL) {
  }

  static Handle<Code> MakeCode(FunctionLiteral* fun,
                               Handle<Script> script,
                               bool is_eval);

  void Generate(FunctionLiteral* fun);

 private:
  int SlotOffset(Slot* slot);

  void Move(Expression::Context destination, Register source);
  void Move(Expression::Context destination, Slot* source);
  void Move(Expression::Context destination, Literal* source);

  // Drop the TOS, and store source to destination.
  // If destination is TOS, just overwrite TOS with source.
  void DropAndMove(Expression::Context destination, Register source);

  // Test the JavaScript value in source as if in a test context, compile
  // control flow to a pair of labels.
  void TestAndBranch(Register source, Label* true_label, Label* false_label);

  void VisitDeclarations(ZoneList<Declaration*>* declarations);
  void DeclareGlobals(Handle<FixedArray> pairs);

  // Platform-specific return sequence
  void EmitReturnSequence(int position);

  // Platform-specific code sequences for calls
  void EmitCallWithStub(Call* expr);
  void EmitCallWithIC(Call* expr, RelocInfo::Mode reloc_info);

  // Platform-specific support for compiling assignments.

  // Complete a variable assignment.  The right-hand-side value is expected
  // on top of the stack.
  void EmitVariableAssignment(Assignment* expr);

  // Complete a named property assignment.  The receiver and right-hand-side
  // value are expected on top of the stack.
  void EmitNamedPropertyAssignment(Assignment* expr);

  // Complete a keyed property assignment.  The reciever, key, and
  // right-hand-side value are expected on top of the stack.
  void EmitKeyedPropertyAssignment(Assignment* expr);

  void SetFunctionPosition(FunctionLiteral* fun);
  void SetReturnPosition(FunctionLiteral* fun);
  void SetStatementPosition(Statement* stmt);
  void SetSourcePosition(int pos);

  int loop_depth() { return loop_depth_; }
  void increment_loop_depth() { loop_depth_++; }
  void decrement_loop_depth() {
    ASSERT(loop_depth_ > 0);
    loop_depth_--;
  }

  // AST node visit functions.
#define DECLARE_VISIT(type) virtual void Visit##type(type* node);
  AST_NODE_LIST(DECLARE_VISIT)
#undef DECLARE_VISIT

  // Handles the shortcutted logical binary operations in VisitBinaryOperation.
  void EmitLogicalOperation(BinaryOperation* expr);

  MacroAssembler* masm_;
  FunctionLiteral* function_;
  Handle<Script> script_;
  bool is_eval_;
  Label return_label_;
  int loop_depth_;

  Label* true_label_;
  Label* false_label_;

  DISALLOW_COPY_AND_ASSIGN(FastCodeGenerator);
};


} }  // namespace v8::internal

#endif  // V8_FAST_CODEGEN_H_