com.sun.tools.javac.jvm
Class Items

java.lang.Object
  com.sun.tools.javac.jvm.Items

public class Items
extends java.lang.Object

A helper class for code generation. Items are objects that stand for addressable entities in the bytecode. Each item supports a fixed protocol for loading the item on the stack, storing into it, converting it into a jump condition, and several others. There are many individual forms of items, such as local, static, indexed, or instance variables, values on the top of stack, the special values this or super, etc. Individual items are represented as inner classes in class Items.

This is NOT part of any API supported by Sun Microsystems. If you write code that depends on this, you do so at your own risk. This code and its internal interfaces are subject to change or deletion without notice.

Nested Class Summary

(package private) class	Items.AssignItem An item representing an assignment expressions.
(package private) class	Items.CondItem An item representing a conditional or unconditional jump.
(package private) class	Items.ImmediateItem An item representing a literal.
(package private) class	Items.IndexedItem An item representing an indexed expression.
(package private) class	Items.Item The base class of all items, which implements default behavior.
(package private) class	Items.LocalItem An item representing a local variable.
(package private) class	Items.MemberItem An item representing an instance variable or method.
(package private) class	Items.SelfItem An item representing `this' or `super'.
(package private) class	Items.StackItem An item representing a value on stack.
(package private) class	Items.StaticItem An item representing a static variable or method.

Field Summary

(package private) Code	code The current code buffer.
(package private) Pool	pool The current constant pool.
private Items.Item[]	stackItem
private Items.Item	superItem
(package private) Symtab	syms The current symbol table.
private Items.Item	thisItem
(package private) Types	types Type utilities.
private Items.Item	voidItem Items that exist only once (flyweight pattern).

Constructor Summary

Items(Pool pool, Code code, Symtab syms, Types types)

Method Summary

(package private) Items.Item	makeAssignItem(Items.Item lhs) Make an item representing an assignment expression.
(package private) Items.CondItem	makeCondItem(int opcode) Make an item representing a conditional or unconditional jump.
(package private) Items.CondItem	makeCondItem(int opcode, Code.Chain trueJumps, Code.Chain falseJumps) Make an item representing a conditional or unconditional jump.
(package private) Items.Item	makeImmediateItem(Type type, java.lang.Object value) Make an item representing a literal.
(package private) Items.Item	makeIndexedItem(Type type) Make an item representing an indexed expression.
(package private) Items.LocalItem	makeLocalItem(Symbol.VarSymbol v) Make an item representing a local variable.
private Items.LocalItem	makeLocalItem(Type type, int reg) Make an item representing a local anonymous variable.
(package private) Items.Item	makeMemberItem(Symbol member, boolean nonvirtual) Make an item representing an instance variable or method.
(package private) Items.Item	makeStackItem(Type type) Make an item representing a value on stack.
(package private) Items.Item	makeStaticItem(Symbol member) Make an item representing a static variable or method.
(package private) Items.Item	makeSuperItem() Make an item representing `super'.
(package private) Items.Item	makeThisItem() Make an item representing `this'.
(package private) Items.Item	makeVoidItem() Make a void item

Methods inherited from class java.lang.Object

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

Field Detail

pool

Pool pool

The current constant pool.

code

Code code

The current code buffer.

syms

Symtab syms

The current symbol table.

types

Types types

Type utilities.

voidItem

private final Items.Item voidItem

Items that exist only once (flyweight pattern).

thisItem

private final Items.Item thisItem

superItem

private final Items.Item superItem

stackItem

private final Items.Item[] stackItem

Constructor Detail

Items

public Items(Pool pool,
             Code code,
             Symtab syms,
             Types types)

Method Detail

makeVoidItem

Items.Item makeVoidItem()

Make a void item

makeThisItem

Items.Item makeThisItem()

Make an item representing `this'.

makeSuperItem

Items.Item makeSuperItem()

Make an item representing `super'.

makeStackItem

Items.Item makeStackItem(Type type)

Make an item representing a value on stack.

Parameters:

type - The value's type.

makeIndexedItem

Items.Item makeIndexedItem(Type type)

Make an item representing an indexed expression.

Parameters:

type - The expression's type.

makeLocalItem

Items.LocalItem makeLocalItem(Symbol.VarSymbol v)

Make an item representing a local variable.

Parameters:

v - The represented variable.

makeLocalItem

private Items.LocalItem makeLocalItem(Type type,
                                      int reg)

Make an item representing a local anonymous variable.

Parameters:

type - The represented variable's type.

reg - The represented variable's register.

makeStaticItem

Items.Item makeStaticItem(Symbol member)

Make an item representing a static variable or method.

Parameters:

member - The represented symbol.

makeMemberItem

Items.Item makeMemberItem(Symbol member,
                          boolean nonvirtual)

Make an item representing an instance variable or method.

Parameters:

member - The represented symbol.

nonvirtual - Is the reference not virtual? (true for constructors and private members).

makeImmediateItem

Items.Item makeImmediateItem(Type type,
                             java.lang.Object value)

Make an item representing a literal.

Parameters:

type - The literal's type.

value - The literal's value.

makeAssignItem

Items.Item makeAssignItem(Items.Item lhs)

Make an item representing an assignment expression.

Parameters:

lhs - The item representing the assignment's left hand side.

makeCondItem

Items.CondItem makeCondItem(int opcode,
                            Code.Chain trueJumps,
                            Code.Chain falseJumps)

Make an item representing a conditional or unconditional jump.

Parameters:

opcode - The jump's opcode.

trueJumps - A chain encomassing all jumps that can be taken if the condition evaluates to true.

falseJumps - A chain encomassing all jumps that can be taken if the condition evaluates to false.

makeCondItem

Items.CondItem makeCondItem(int opcode)

Make an item representing a conditional or unconditional jump.

Parameters:

opcode - The jump's opcode.