gnu.expr
Class ReferenceExp

java.lang.Object
  gnu.mapping.PropertySet
      gnu.mapping.Procedure
          gnu.mapping.Procedure0
              gnu.expr.Expression
                  gnu.expr.AccessExp
                      gnu.expr.ReferenceExp

All Implemented Interfaces:

Named, Printable, javax.xml.transform.SourceLocator, org.xml.sax.Locator

Direct Known Subclasses:

ThisExp

public class ReferenceExp
extends AccessExp

This class represents a variable reference (an identifier).

Field Summary

static int	CREATE_FIELD_REFERENCE Create a FieldLocation referencing the binding.
static int	DONT_DEREFERENCE
static int	PREFER_BINDING2
static int	PROCEDURE_NAME

Fields inherited from class gnu.expr.Expression

flags, NEXT_AVAIL_FLAG, noExpressions

Fields inherited from class gnu.mapping.PropertySet

nameKey

Constructor Summary

ReferenceExp(Declaration binding)

ReferenceExp(java.lang.Object symbol)

ReferenceExp(java.lang.Object symbol, Declaration binding)

Method Summary

void	apply(CallContext ctx) Evaluate the expression.
void	compile(Compilation comp, Target target)
boolean	getDontDereference()
Type	getType() Return the Type used to represent the values of this Expression.
Expression	inline(ApplyExp exp, InlineCalls walker, Declaration decl, boolean argsInlined) Apply inlining transformations on a given ApplyExp.
boolean	isProcedureName() True if this identifier appears in "function call position".
boolean	isUnknown()
protected boolean	mustCompile()
void	print(OutPort ps)
void	setDontDereference(boolean setting)
void	setProcedureName(boolean setting) Note if this identifier appears in "function call position".
boolean	side_effects() True if evaluating may have side-effects.
java.lang.String	toString()
protected Expression	walk(ExpWalker walker)

Methods inherited from class gnu.expr.AccessExp

contextDecl, getBinding, getName, getSimpleName, getSymbol, setBinding, setContextDecl, string_name

Methods inherited from class gnu.expr.Expression

apply0, compile, compile, compileButFirst, compileNotePosition, compileWithPosition, compileWithPosition, eval, eval, getColumnNumber, getFileName, getFlag, getFlags, getLineNumber, getPublicId, getSystemId, isStableSourceLocation, makeWhile, match0, print, printLineColumn, setFile, setFlag, setFlag, setLine, setLine, setLine, setLine, setLocation, valueIfConstant, walkChildren

Methods inherited from class gnu.mapping.Procedure0

apply1, apply2, apply3, apply4, applyN, numArgs

Methods inherited from class gnu.mapping.Procedure

apply, check0, check1, check2, check3, check4, checkArgCount, checkN, getSetter, getSourceLocation, match1, match2, match3, match4, matchN, maxArgs, minArgs, set0, set1, setN, setSetter, setSourceLocation

Methods inherited from class gnu.mapping.PropertySet

getProperty, removeProperty, setName, setProperty, setProperty, setSymbol

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

DONT_DEREFERENCE

public static final int DONT_DEREFERENCE

See Also:

Constant Field Values

PROCEDURE_NAME

public static final int PROCEDURE_NAME

See Also:

Constant Field Values

PREFER_BINDING2

public static final int PREFER_BINDING2

See Also:

Constant Field Values

CREATE_FIELD_REFERENCE

public static final int CREATE_FIELD_REFERENCE

Create a FieldLocation referencing the binding.

See Also:

Constant Field Values

Constructor Detail

ReferenceExp

public ReferenceExp(java.lang.Object symbol)

ReferenceExp

public ReferenceExp(java.lang.Object symbol,
                    Declaration binding)

ReferenceExp

public ReferenceExp(Declaration binding)

Method Detail

getDontDereference

public final boolean getDontDereference()

setDontDereference

public final void setDontDereference(boolean setting)

isUnknown

public final boolean isUnknown()

isProcedureName

public final boolean isProcedureName()

True if this identifier appears in "function call position". If so, it should be interpreted as a function name, which makes a difference for languages (like Common Lisp) that have two name spaces.

setProcedureName

public final void setProcedureName(boolean setting)

Note if this identifier appears in "function call position".

mustCompile

protected boolean mustCompile()

Specified by:

mustCompile in class Expression

apply

public void apply(CallContext ctx)
           throws java.lang.Throwable

Description copied from class: Expression

Evaluate the expression. This is named apply rather than eval so it is compatible with the full-tail-call calling convention, and we can stash an Expression in CallContext's proc field. FIXME - are we making use of this?

Overrides:

apply in class Expression

Throws:

java.lang.Throwable

compile

public void compile(Compilation comp,
                    Target target)

Specified by:

compile in class Expression

walk

protected Expression walk(ExpWalker walker)

Overrides:

walk in class Expression

inline

public Expression inline(ApplyExp exp,
                         InlineCalls walker,
                         Declaration decl,
                         boolean argsInlined)

Description copied from class: Expression

Apply inlining transformations on a given ApplyExp. Assumes the ApplyExp's function is this expression, or can be optimized to this expression.

Overrides:

inline in class Expression

Parameters:

exp - an application whose function expression can be simplified to this expression.

walker - the context for the current inlining pass

decl - if non-null, a Declaration bound to this expression.

argsInlined - true iff exp.getArgs() have been walked.

Returns:

an Expression equivalent to the passed-in exp.

print

public void print(OutPort ps)

Specified by:

print in class Expression

getType

public Type getType()

Description copied from class: Expression

Return the Type used to represent the values of this Expression.

Overrides:

getType in class Expression

side_effects

public boolean side_effects()

Description copied from class: Expression

True if evaluating may have side-effects.

Overrides:

side_effects in class Expression

toString

public java.lang.String toString()

Overrides:

toString in class Expression