gnu.expr
Class BeginExp

java.lang.Object
  gnu.mapping.PropertySet
      gnu.mapping.Procedure
          gnu.mapping.Procedure0
              gnu.expr.Expression
                  gnu.expr.BeginExp

All Implemented Interfaces:

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

public class BeginExp
extends Expression

This class represents a sequence of Expressions. The expressions are evaluated for their side-effects, and the value of the last Expression is the result. A BeginExp may optionally have "compilation options" which can be used to control various compile-time aspects of Kawa, such as warning messages.

Field Summary

Fields inherited from class gnu.expr.Expression

flags, NEXT_AVAIL_FLAG, noExpressions

Constructor Summary

BeginExp()

BeginExp(Expression[] ex)

BeginExp(Expression exp0, Expression exp1)

Method Summary

void	add(Expression exp)
void	apply(CallContext ctx) Evaluate the expression.
static Expression	canonicalize(Expression exp) Simplifies BeginExp.
static Expression	canonicalize(Expression[] exps)
void	compile(Compilation comp, Target target)
int	getExpressionCount()
Expression[]	getExpressions()
Type	getType() Return the Type used to represent the values of this Expression.
protected boolean	mustCompile()
void	popOptions(Compilation comp)
void	print(OutPort out)
void	pushOptions(Compilation comp)
void	setCompileOptions(java.util.Vector options)
void	setExpressions(Expression[] exps)
protected Expression	walk(ExpWalker walker)
protected void	walkChildren(ExpWalker walker)

Methods inherited from class gnu.expr.Expression

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

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

getName, getProperty, getSymbol, removeProperty, setName, setProperty, setProperty, setSymbol

Methods inherited from class java.lang.Object

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

Constructor Detail

BeginExp

public BeginExp()

BeginExp

public BeginExp(Expression[] ex)

BeginExp

public BeginExp(Expression exp0,
                Expression exp1)

Method Detail

canonicalize

public static final Expression canonicalize(Expression exp)

Simplifies BeginExp. (In the future, nested BeginExps may be "flattened" as well.)

canonicalize

public static final Expression canonicalize(Expression[] exps)

add

public final void add(Expression exp)

getExpressions

public final Expression[] getExpressions()

getExpressionCount

public final int getExpressionCount()

setExpressions

public final void setExpressions(Expression[] exps)

setCompileOptions

public void setCompileOptions(java.util.Vector options)

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

pushOptions

public void pushOptions(Compilation comp)

popOptions

public void popOptions(Compilation comp)

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

walkChildren

protected void walkChildren(ExpWalker walker)

Overrides:

walkChildren in class Expression

print

public void print(OutPort out)

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