gnu.kawa.lispexpr
Class LangPrimType

java.lang.Object
  gnu.bytecode.Type
      gnu.bytecode.PrimType
          gnu.kawa.lispexpr.LangPrimType

All 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

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

Constructor Summary

LangPrimType(PrimType type)

LangPrimType(PrimType type, Language language)

LangPrimType(java.lang.String nam, java.lang.String sig, int siz, java.lang.Class reflectClass)

LangPrimType(java.lang.String nam, java.lang.String sig, int siz, java.lang.Class reflectClass, Language language)

Method Summary

char	charValue(java.lang.Object value) Coerce value to a char.
java.lang.Object	coerceFromObject(java.lang.Object obj) Convert an object to a value of this Type.
java.lang.Object	coerceToObject(java.lang.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) Emit code for incoming instanceof this_type.
void	emitTestIf(Variable incoming, Declaration decl, Compilation comp) Emit code for if (incoming instanceof this_type) decl = incoming ....
Type	getImplementationType() The type used to implement types not natively understood by the JVM.

Methods inherited from class gnu.bytecode.PrimType

booleanValue, compare

Methods inherited from class gnu.bytecode.Type

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

Methods inherited from class java.lang.Object

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

Field Detail

byteType

public static final LangPrimType byteType

shortType

public static final LangPrimType shortType

intType

public static final LangPrimType intType

longType

public static final LangPrimType longType

floatType

public static final LangPrimType floatType

doubleType

public static final LangPrimType doubleType

charType

public static final LangPrimType charType

voidType

public static final LangPrimType voidType

Constructor Detail

LangPrimType

public LangPrimType(PrimType type)

LangPrimType

public LangPrimType(PrimType type,
                    Language language)

LangPrimType

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

LangPrimType

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

Method Detail

getImplementationType

public Type getImplementationType()

Description copied from class: Type

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 class Type

coerceFromObject

public java.lang.Object coerceFromObject(java.lang.Object obj)

Description copied from class: Type

Convert an object to a value of this Type. Throw a ClassCastException when this is not possible.

Overrides:

coerceFromObject in class PrimType

charValue

public char charValue(java.lang.Object value)

Description copied from class: PrimType

Coerce value to a char. Only defined if getSignature() is "C".

Overrides:

charValue in class PrimType

emitIsInstance

public void emitIsInstance(CodeAttr code)

Overrides:

emitIsInstance in class PrimType

emitCoerceFromObject

public void emitCoerceFromObject(CodeAttr code)

Description copied from class: Type

Compile code to coerce/convert from Object to this type.

Overrides:

emitCoerceFromObject in class PrimType

coerceToObject

public java.lang.Object coerceToObject(java.lang.Object obj)

Overrides:

coerceToObject in class Type

emitCoerceToObject

public void emitCoerceToObject(CodeAttr code)

Description copied from class: Type

Compile code to convert a object of this type on the stack to Object.

Overrides:

emitCoerceToObject in class PrimType

compare

public int compare(Type other)

Description copied from class: Type

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 class PrimType

emitTestIf

public void emitTestIf(Variable incoming,
                       Declaration decl,
                       Compilation comp)

Description copied from interface: TypeValue

Emit code for if (incoming instanceof this_type) decl = incoming .... This method is designed for typeswitch applications, where this call is the first part of a conditional, so it must be followed by calls to emitElse and emitFi.

Specified by:

emitTestIf in interface TypeValue

Parameters:

incoming - Contains the value we are testing to see if it has the type of this. If null, use top-of-stack.

decl - If non-null, assign value after coercion to Declaration.

comp - The compilation state.

emitIsInstance

public void emitIsInstance(Variable incoming,
                           Compilation comp,
                           Target target)

Description copied from interface: TypeValue

Emit code for incoming instanceof this_type. The implementation can use InstanceOf .emitIsInstance which is a conveniece method that calls emitTestIf.

Specified by:

emitIsInstance in interface TypeValue

Parameters:

incoming - Contains the value we are testing to see if it has the the type of 'this'. If null, use top-of-stack.

comp - The compilation state.

target - Where to leave the result.