gnu.kawa.lispexpr

Class LangPrimType

Implemented Interfaces:
TypeValue

public class LangPrimType
extends PrimType
implements TypeValue

Use to implement some special types that convert differently.

Field Summary

static LangPrimType
byteType
static LangPrimType
charType
static LangPrimType
doubleType
static LangPrimType
floatType
static LangPrimType
intType
static LangPrimType
longType
static LangPrimType
shortType
static LangPrimType
voidType

Fields inherited from class gnu.bytecode.Type

booleanValue_method, boolean_ctype, boolean_type, byte_type, char_type, doubleValue_method, double_type, floatValue_method, float_type, intValue_method, int_type, java_lang_Class_type, longValue_method, long_type, neverReturnsType, nullType, number_type, pointer_type, reflectClass, short_type, string_type, throwable_type, toString_method, tostring_type, typeArray0, void_type

Constructor Summary

LangPrimType(String nam, String sig, int siz, Class reflectClass)
LangPrimType(String nam, String sig, int siz, Class reflectClass, Language language)
LangPrimType(PrimType type)
LangPrimType(PrimType type, Language language)

Method Summary

char
charValue(Object value)
Coerce value to a char.
Object
coerceFromObject(Object obj)
Convert an object to a value of this Type.
Object
coerceToObject(Object obj)
int
compare(Type other)
Return a numeric code showing "subtype" relationship: 1: if other is a pure subtype of this; 0: if has the same values; -1: if this is a pure subtype of other; -2: if they have values in common but neither is a subtype of the other; -3: if the types have no values in common.
void
emitCoerceFromObject(CodeAttr code)
Compile code to coerce/convert from Object to this type.
void
emitCoerceToObject(CodeAttr code)
Compile code to convert a object of this type on the stack to Object.
void
emitIsInstance(CodeAttr code)
void
emitIsInstance(Variable incoming, Compilation comp, Target target)
void
emitTestIf(Variable incoming, Declaration decl, Compilation comp)
Type
getImplementationType()
The type used to implement types not natively understood by the JVM.

Methods inherited from class gnu.bytecode.PrimType

booleanValue, charValue, coerceFromObject, compare, compare, emitCoerceFromObject, emitCoerceToObject, emitIsInstance

Methods inherited from class gnu.bytecode.Type

coerceFromObject, coerceToObject, compare, emitCoerceFromObject, emitCoerceToObject, emitIsInstance, getImplementationType, getName, getReflectClass, getSignature, getSize, getType, hashCode, isInstance, isMoreSpecific, isSubtype, isValidJavaTypeName, isVoid, lookupType, lowestCommonSuperType, make, promote, registerTypeForClass, setName, setReflectClass, setSignature, signatureLength, signatureLength, signatureToName, signatureToPrimitive, signatureToType, signatureToType, swappedCompareResult, toString

Field Details

byteType

public static final LangPrimType byteType

charType

public static final LangPrimType charType

doubleType

public static final LangPrimType doubleType

floatType

public static final LangPrimType floatType

intType

public static final LangPrimType intType

longType

public static final LangPrimType longType

shortType

public static final LangPrimType shortType

voidType

public static final LangPrimType voidType

Constructor Details

LangPrimType

public LangPrimType(String nam,
                    String sig,
                    int siz,
                    Class reflectClass)

LangPrimType

public LangPrimType(String nam,
                    String sig,
                    int siz,
                    Class reflectClass,
                    Language language)

LangPrimType

public LangPrimType(PrimType type)

LangPrimType

public LangPrimType(PrimType type,
                    Language language)

Method Details

charValue

public char charValue(Object value)
Coerce value to a char. Only defined if getSignature() is "C".
Overrides:
charValue in interface PrimType

coerceFromObject

public Object coerceFromObject(Object obj)
Convert an object to a value of this Type. Throw a ClassCastException when this is not possible.
Overrides:
coerceFromObject in interface PrimType

coerceToObject

public Object coerceToObject(Object obj)
Overrides:
coerceToObject in interface Type

compare

public int compare(Type other)
Return a numeric code showing "subtype" relationship: 1: if other is a pure subtype of this; 0: if has the same values; -1: if this is a pure subtype of other; -2: if they have values in common but neither is a subtype of the other; -3: if the types have no values in common. "Same member" is rather loose; by "A is a subtype of B" we mean that all instance of A can be "widened" to B. More formally, A.compare(B) returns: 1: all B values can be converted to A without a coercion failure (i.e. a ClassCastException or overflow or major loss of information), but not vice versa. 0: all A values can be converted to B without a coercion failure and vice versa; -1: all A values can be converted to B without a coercion failure not not vice versa; -2: there are (potentially) some A values that can be converted to B, and some B values can be converted to A; -3: there are no A values that can be converted to B, and neither are there any B values that can be converted to A.
Overrides:
compare in interface PrimType

emitCoerceFromObject

public void emitCoerceFromObject(CodeAttr code)
Compile code to coerce/convert from Object to this type.
Overrides:
emitCoerceFromObject in interface PrimType

emitCoerceToObject

public void emitCoerceToObject(CodeAttr code)
Compile code to convert a object of this type on the stack to Object.
Overrides:
emitCoerceToObject in interface PrimType

emitIsInstance

public void emitIsInstance(CodeAttr code)
Overrides:
emitIsInstance in interface PrimType

emitIsInstance

public void emitIsInstance(Variable incoming,
                           Compilation comp,
                           Target target)
Specified by:
emitIsInstance in interface TypeValue

emitTestIf

public void emitTestIf(Variable incoming,
                       Declaration decl,
                       Compilation comp)
Specified by:
emitTestIf in interface TypeValue

getImplementationType

public Type getImplementationType()
The type used to implement types not natively understood by the JVM. Usually, the identity function. However, a language might handle union types or template types or type expressions calculated at run time. In that case return the type used at the JVM level, and known at compile time.
Specified by:
getImplementationType in interface TypeValue
Overrides:
getImplementationType in interface Type