org.jikesrvm.compilers.opt

Class StaticFieldReader

java.lang.Object

org.jikesrvm.compilers.opt.StaticFieldReader

public abstract class StaticFieldReader
extends Object

Code for accessing the value of a static field at compile time. This is used to optimize getstatic's of initialized static fields by replacing the getstatic with a constant operand.

Constructor Summary

Constructors

Constructor and Description
StaticFieldReader()

Method Summary

Modifier and Type	Method and Description
private static void	assertNotReached()
static Address	getAddressStaticFieldValue(RVMField field) Returns the current contents of a Address static field.
static double	getDoubleStaticFieldValue(RVMField field) Returns the current contents of a double static field.
static ConstantOperand	getFieldValueAsConstant(RVMField field, Object obj)
static float	getFloatStaticFieldValue(RVMField field) Returns the current contents of a float static field.
static int	getIntStaticFieldValue(RVMField field) Returns the current contents of an int-like static field.
private static Field	getJDKField(RVMField field) Converts a RVMField to a java.lang.reflect.Field.
static long	getLongStaticFieldValue(RVMField field) Returns the current contents of a long static field.
static Object	getObjectStaticFieldValue(RVMField field) Returns the current contents of a reference static field.
static ConstantOperand	getStaticFieldValue(RVMField field) Returns a constant operand with the current value of a static field.
static TypeReference	getTypeFromStaticField(RVMField field) Get the type of an object contained in a static field.
static boolean	isStaticFieldNull(RVMField field) Does a static field null contain null?
private static void	throwNoSuchFieldExceptionWithCause(RVMField field, Throwable cause)
private static void	throwOptimizingCompilerExceptionBecauseOfIllegalAccess(RVMField field, Throwable e)

Methods inherited from class java.lang.Object

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

Constructor Detail

StaticFieldReader

public StaticFieldReader()

Method Detail

getFieldValueAsConstant

public static ConstantOperand getFieldValueAsConstant(RVMField field,
                                                      Object obj)
                                               throws NoSuchFieldException

Throws:

NoSuchFieldException

getStaticFieldValue

public static ConstantOperand getStaticFieldValue(RVMField field)
                                           throws NoSuchFieldException

Returns a constant operand with the current value of a static field.

Parameters:

field - the static field whose current value we want to read

Returns:

a constant operand representing the current value of the field.

Throws:

NoSuchFieldException - when the field could not be found

getIntStaticFieldValue

public static int getIntStaticFieldValue(RVMField field)
                                  throws NoSuchFieldException

Returns the current contents of an int-like static field.

Parameters:

field - a static field

Returns:

the current value of the field

Throws:

NoSuchFieldException - when the field could not be found

getFloatStaticFieldValue

public static float getFloatStaticFieldValue(RVMField field)
                                      throws NoSuchFieldException

Returns the current contents of a float static field.

Parameters:

field - a static field

Returns:

the current value of the field

Throws:

NoSuchFieldException - when the field could not be found

getLongStaticFieldValue

public static long getLongStaticFieldValue(RVMField field)
                                    throws NoSuchFieldException

Returns the current contents of a long static field.

Parameters:

field - a static field

Returns:

the current value of the field

Throws:

NoSuchFieldException - when the field could not be found

getDoubleStaticFieldValue

public static double getDoubleStaticFieldValue(RVMField field)
                                        throws NoSuchFieldException

Returns the current contents of a double static field.

Parameters:

field - a static field

Returns:

the current value of the field

Throws:

NoSuchFieldException - when the field could not be found

getObjectStaticFieldValue

public static Object getObjectStaticFieldValue(RVMField field)
                                        throws NoSuchFieldException

Returns the current contents of a reference static field.

Parameters:

field - a static field

Returns:

the current value of the field

Throws:

NoSuchFieldException - when the field could not be found

getAddressStaticFieldValue

public static Address getAddressStaticFieldValue(RVMField field)
                                          throws NoSuchFieldException

Returns the current contents of a Address static field.

Parameters:

field - a static field

Returns:

the current value of the field

Throws:

NoSuchFieldException - when the field could not be found

isStaticFieldNull

public static boolean isStaticFieldNull(RVMField field)
                                 throws NoSuchFieldException

Does a static field null contain null?

Parameters:

field - a static field

Returns:

true if the field contains null, false otherwise

Throws:

NoSuchFieldException - when the field could not be found

getTypeFromStaticField

public static TypeReference getTypeFromStaticField(RVMField field)
                                            throws NoSuchFieldException

Get the type of an object contained in a static field.

Parameters:

field - a static field

Returns:

type of value contained in the field

Throws:

NoSuchFieldException - when the field could not be found

getJDKField

private static Field getJDKField(RVMField field)
                          throws NoSuchFieldException

Converts a RVMField to a java.lang.reflect.Field.

Parameters:

field - the internal field representation

Returns:

the java.lang field representation

Throws:

NoSuchFieldException - when the field could not be found

throwOptimizingCompilerExceptionBecauseOfIllegalAccess

private static void throwOptimizingCompilerExceptionBecauseOfIllegalAccess(RVMField field,
                                                                           Throwable e)

throwNoSuchFieldExceptionWithCause

private static void throwNoSuchFieldExceptionWithCause(RVMField field,
                                                       Throwable cause)
                                                throws NoSuchFieldException

Throws:

NoSuchFieldException

assertNotReached

private static void assertNotReached()