com.sun.squawk
Class MethodBody

java.lang.Object
  com.sun.squawk.MethodBody

public final class MethodBody
extends Object

An instance of MethodBody represents the Squawk bytecode for a method as well as all the other information related to the bytecode such as exception handler tables, oop map for the activation frame etc.

Author:

Doug Simon, Nik Shaylor

Field Summary

static boolean

LOCAL_LONG_ORDER_NORMAL Configuration option.

Constructor Summary

MethodBody(Method definingMethod, int index, int maxStack, Klass[] locals, ExceptionHandler[] exceptionTable, int[] lnt, ScopedLocalVariable[] lvt, byte[] code, byte[] typeMap, boolean reverseParameters)
Creates a MethodBody representing the implementation details of a method.

Method Summary

byte[]	getCode() Gets the bytecode.
Klass	getDefiningClass() Gets the class that defined this method.
Method	getDefiningMethod() Gets the class that defined this method.
ExceptionHandler[]	getExceptionTable() Get the exception table.
int	getIndex() Gets the index of this method's definition in the symbols table of its defining class.
int	getMaxStack() Get the number of stack words needed.
MethodMetadata	getMetadata() Gets the debug information (if any) pertaining to this method body.
int	getParametersCount() Get the number of parameters.
byte[]	getTypeMap() Gets the type map describing the types in activation frame expected by each bytecode.
Klass[]	getTypes() Get the type map.
static boolean	isInterpreterInvoked(Object oop) Determines if a given method is only invoked from the interpreter
String	toString() Produce String for debugging

Methods inherited from class java.lang.Object

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

Field Detail

LOCAL_LONG_ORDER_NORMAL

public static final boolean LOCAL_LONG_ORDER_NORMAL

Configuration option.

If set true then a long or double local variable will be referenced as slot+0. If set false then it is addressed as slot+1.

Setting this false is will produce the correct offsets when the locals are allocated at a negative offset from the frame pointer (which is common for virtually all C ABIs).

See Also:

Constant Field Values

Constructor Detail

MethodBody

public MethodBody(Method definingMethod,
                  int index,
                  int maxStack,
                  Klass[] locals,
                  ExceptionHandler[] exceptionTable,
                  int[] lnt,
                  ScopedLocalVariable[] lvt,
                  byte[] code,
                  byte[] typeMap,
                  boolean reverseParameters)

Creates a MethodBody representing the implementation details of a method.

Parameters:

definingMethod - the method in which the method body was defined

index - the index of the method in the symbols table

maxStack - the maximum size in words of the operand stack

locals - the types of the local variables (excludes parameters)

exceptionTable - the exception handler table

lnt - the table mapping instruction addresses to the source line numbers that start at the addresses. The table is encoded as an int array where the high 16-bits of each element is an instruction address and the low 16-bits is the corresponding source line

lvt - the table describing the symbolic information for the local variables in the method

code - the Squawk bytecode

typeMap - the type map describing the type of the value (if any) written to memory by each instruction in 'code'

reverseParameters - true if the parameters are pushed right-to-left

Method Detail

toString

public String toString()

Produce String for debugging

Overrides:

toString in class Object

Returns:

the string

getIndex

public int getIndex()

Gets the index of this method's definition in the symbols table of its defining class.

Returns:

the index of this method's definition

getCode

public byte[] getCode()

Gets the bytecode.

Returns:

the bytecode

getTypeMap

public byte[] getTypeMap()

Gets the type map describing the types in activation frame expected by each bytecode.

Returns:

the type map describing the types in activation frame expected by each bytecode

getTypes

public Klass[] getTypes()

Get the type map.

Returns:

the type map

getDefiningMethod

public Method getDefiningMethod()

Gets the class that defined this method.

Returns:

the class that defined this method

getDefiningClass

public Klass getDefiningClass()

Gets the class that defined this method.

Returns:

the class that defined this method

getParametersCount

public int getParametersCount()

Get the number of parameters.

Returns:

the number

getExceptionTable

public ExceptionHandler[] getExceptionTable()

Get the exception table.

Returns:

the number

getMaxStack

public int getMaxStack()

Get the number of stack words needed.

Returns:

the number

getMetadata

public MethodMetadata getMetadata()

Gets the debug information (if any) pertaining to this method body.

Returns:

the debug information pertaining to this method body or null if there isn't any

isInterpreterInvoked

public static boolean isInterpreterInvoked(Object oop)

Determines if a given method is only invoked from the interpreter

Parameters:

oop - the pointer to the method

Returns:

true if oop is an intrepreter invoked only method