hlt.language.design.kernel

Class NewArray

java.lang.Object

hlt.language.design.kernel.Expression

hlt.language.design.kernel.ProtoExpression

hlt.language.design.kernel.NewArray

All Implemented Interfaces:

Locatable

public class NewArray
extends ProtoExpression

This is the class denoting arrays. An array may be indexed by:

• integers from 0 to the array's size minus one (i.e., like a C or Java array);
• integers in a given range l..u;
• elements of a set (in which case the array is in fact an associative map.

All arrays are represented as unidimensional arrays - multidimensional arrays are simply arrays of arrays.

Field Summary

Fields inherited from class hlt.language.design.kernel.Expression

VOID_ASSIGNMENTS

Constructor Summary

Constructors

Constructor and Description
NewArray(Type baseType, java.util.AbstractList dimension)
NewArray(Type baseType, Expression[] dimension)

Method Summary

Methods

Modifier and Type	Method and Description
Type	baseType()
void	compile(Compiler compiler) To compile a new array, we: compile the last dimension, generate a PUSH_[ARRAY,MAP]_[I,R,O] instruction, compile the next to last dimension, generate a FILL_[ARRAY,MAP]_[I,R,O][AM] instruction, compile each of the other dimensions followed with a FILL_[ARRAY,MAP]_O[A,M] instruction.
Expression	copy() Returns a deep copy of this expression.
Expression[]	dimension()
int	numberOfSubexpressions() Returns the number of subexpressions
void	setCheckedType() This method sets the final unambiguously checked type of this expression, possibly along with other final information that may be needed by the compiler for generating code.
Expression	setSubexpression(int n, Expression expression) Returns this expression after setting its n-th subexpression to the specified expression; if there is no subexpression at the given position, this throws a NoSuchSubexpressionException
Expression	subexpression(int n) Returns the n-th subexpression of this expression; if there is no subexpression at the given position, this throws a NoSuchSubexpressionException
java.lang.String	toString()
void	typeCheck(TypeChecker typeChecker) To typecheck a new array, we typecheck: each dimension to have an allowed index set type (i.e., int, int range, or set), this as an array type with the base type and dimension types.
Expression	typedCopy() Returns a deep copy of this expression this and all its subexpressions share the same type as their copy's counterparts.

Methods inherited from class hlt.language.design.kernel.ProtoExpression

checkedType, setCheckedType, setType, type, typeRef

Methods inherited from class hlt.language.design.kernel.Expression

addType, addTypes, boxSort, containsFreeName, enclosingScope, extent, getEnd, getStart, isConstant, isEquality, isFalse, isHiddenSlicing, isNull, isSelector, isSlicing, isTrue, isVoid, locationString, otherTypes, parameters, sanitizeNames, sanitizeSorts, setCheckedTypeLocked, setEnd, setExtent, setOtherTypes, setStart, shiftOffsets, shiftOffsets, sort, substitute, typeCheck, typeCheck, typeCheckLocked

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

NewArray

public NewArray(Type baseType,
        Expression[] dimension)

NewArray

public NewArray(Type baseType,
        java.util.AbstractList dimension)

Method Detail

copy

public final Expression copy()

Description copied from class: Expression

Returns a deep copy of this expression. The types are not not copied. NB: This is a convenience for building expressions that should be used exclusively before any processing (in particular sanitizing), is done on this expression.

Specified by:

copy in class Expression

typedCopy

public final Expression typedCopy()

Description copied from class: Expression

Returns a deep copy of this expression this and all its subexpressions share the same type as their copy's counterparts. NB: This is a convenience for building expressions that should be used exclusively before any processing (in particular sanitizing), is done on this expression.

Specified by:

typedCopy in class Expression

numberOfSubexpressions

public final int numberOfSubexpressions()

Description copied from class: Expression

Returns the number of subexpressions

Overrides:

numberOfSubexpressions in class Expression

subexpression

public final Expression subexpression(int n)
                               throws NoSuchSubexpressionException

Description copied from class: Expression

Returns the n-th subexpression of this expression; if there is no subexpression at the given position, this throws a NoSuchSubexpressionException

Overrides:

subexpression in class Expression

Throws:

NoSuchSubexpressionException

setSubexpression

public final Expression setSubexpression(int n,
                          Expression expression)
                                  throws NoSuchSubexpressionException

Description copied from class: Expression

Returns this expression after setting its n-th subexpression to the specified expression; if there is no subexpression at the given position, this throws a NoSuchSubexpressionException

Overrides:

setSubexpression in class Expression

Throws:

NoSuchSubexpressionException

dimension

public final Expression[] dimension()

baseType

public final Type baseType()

setCheckedType

public final void setCheckedType()

Description copied from class: Expression

This method sets the final unambiguously checked type of this expression, possibly along with other final information that may be needed by the compiler for generating code.

Specified by:

setCheckedType in class Expression

typeCheck

public final void typeCheck(TypeChecker typeChecker)
                     throws TypingErrorException

To typecheck a new array, we typecheck:

1. each dimension to have an allowed index set type (i.e., int, int range, or set),
2. this as an array type with the base type and dimension types.

Specified by:

typeCheck in class Expression

Throws:

TypingErrorException

compile

public final void compile(Compiler compiler)

To compile a new array, we:

1. compile the last dimension,
2. generate a PUSH_[ARRAY,MAP]_[I,R,O] instruction,
3. compile the next to last dimension,
4. generate a FILL_[ARRAY,MAP]_[I,R,O][AM] instruction,
5. compile each of the other dimensions followed with a FILL_[ARRAY,MAP]_O[A,M] instruction.

Specified by:

compile in class Expression

toString

public final java.lang.String toString()

Overrides:

toString in class java.lang.Object