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## avrora.core.isdl.ast
Class VarExpr

    java.lang.Object
      avrora.core.isdl.ast.Expr
          avrora.core.isdl.ast.VarExpr

public class VarExpr
extends Expr

The `VarExpr` class represents an expression in the IR that is a use of a local or global variable.

Field Summary
`Token` | `variable` The `variable` field stores a reference to the token representing the name of the variable being accessed.

Fields inherited from class avrora.core.isdl.ast.Expr
`PREC_A_ADD, PREC_A_AND, PREC_A_MUL, PREC_A_OR, PREC_A_SHIFT, PREC_A_XOR, PREC_L_AND, PREC_L_EQU, PREC_L_OR, PREC_L_REL, PREC_L_XOR, PREC_TERM, PREC_UN`

Constructor Summary
`VarExpr(java.lang.String v)` The constructor for the `VarExpr` class simply initializes the reference to the name of the variable.
`VarExpr(Token v)` The constructor for the `VarExpr` class simply initializes the reference to the name of the variable.

Method Summary
`Expr` | `accept(CodeRebuilder r, java.lang.Object env)` The `accept()` method implements one half of the visitor pattern for rebuilding of expressions.
`void` | `accept(CodeVisitor v)` The `accept()` method implements one half of the visitor pattern so that client visitors can traverse the syntax tree easily and in an extensible way.
`void` | `accept(ExprVisitor v)` The `accept()` method implements one half of the visitor pattern so that client visitors can traverse the syntax tree easily and in an extensible way.
`int` | `getPrecedence()` The `getPrecedence()` method gets the binding precedence for this expression.
`boolean` | `isVariable()` The `isVariable()` method tests whether this expression is a direct variable use and is used in copy propagation.
`java.lang.String` | `toString()` The `toString()` method recursively converts this expression to a string.

Methods inherited from class avrora.core.isdl.ast.Expr
`getBitWidth, innerString, isBitRangeExpr, isConstantExpr, isLiteral, isMap, tokenToBool, tokenToInt`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Field Detail

### variable

    public final Token variable

  The `variable` field stores a reference to the token representing the name of the variable being accessed.

Constructor Detail

### VarExpr

    public VarExpr(Token v)

  The constructor for the `VarExpr` class simply initializes the reference to the name of the variable.

Parameters:
  `v` - the string name of the variable as a token

### VarExpr

    public VarExpr(java.lang.String v)

  The constructor for the `VarExpr` class simply initializes the reference to the name of the variable.

Parameters:
  `v` - the string name of the variable as a token

Method Detail

### isVariable

    public boolean isVariable()

  The `isVariable()` method tests whether this expression is a direct variable use and is used in copy propagation. For instances of `VarExpr`, this method returns true. For all other instances, it returns false.

  Overrides:
    `isVariable` in class `Expr`
  Returns:
    true because this expression is the direct use of a variable

### accept

    public void accept(ExprVisitor v)

  The `accept()` method implements one half of the visitor pattern so that client visitors can traverse the syntax tree easily and in an extensible way.

  Specified by:
    `accept` in class `Expr`
  Parameters:
    `v` - the visitor to accept

### accept

    public void accept(CodeVisitor v)

  The `accept()` method implements one half of the visitor pattern so that client visitors can traverse the syntax tree easily and in an extensible way.

  Specified by:
    `accept` in class `Expr`
  Parameters:
    `v` - the visitor to accept

### accept

    public Expr accept(CodeRebuilder r,
                       java.lang.Object env)

  The `accept()` method implements one half of the visitor pattern for rebuilding of expressions. This visitor allows code to be slightly modified while only writing visit methods for the parts of the syntax tree affected.

  Specified by:
    `accept` in class `Expr`
  Parameters:
    `r` - the rebuilder to accept
  Returns:
    the result of calling the appropriate `visit()` method of the rebuilder

### toString

    public java.lang.String toString()

  The `toString()` method recursively converts this expression to a string. For binary operations, inner expressions will be nested within parentheses if their precedence is lower than the precedence of the parent expression.

  Returns:
    a string representation of this expression

### getPrecedence

    public int getPrecedence()

  The `getPrecedence()` method gets the binding precedence for this expression. This is used to compute when inner expressions must be nested within parentheses in order to preserve the implied order of evaluation.

  Specified by:
    `getPrecedence` in class `Expr`
  Returns:
    an integer representing the precedence of this expression; higher numbers are higher precedence

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