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Java Source Code / Java Documentation » Scripting » Kawa » gnu.bytecode

Source Cross Reference Class Diagram Java Document (Java Doc)

java.lang .Object

gnu.bytecode .Attribute

gnu.bytecode .CodeAttr

CodeAttr

public class CodeAttr extends Attribute implements AttrContainer(Code)

Represents the contents of a standard "Code" attribute.

Most of the actual methods that generate bytecode operation are in this class (typically with names starting with emit), though there are also some in Method.

Note that a CodeAttr is an Attribute of a Method, and can in turn contain other Attributes, such as a LineNumbersAttr.
author:
Per Bothner

Field Summary
final static int	FIXUP_CASE The offset contains a label relative to the previous FIXUP_SWITCH.
final static int	FIXUP_CATCH Second half of a FIXUP_TRY/FIXUP_CATCH pair. The label is the ed of the try clause; the current offset is the exception type as a constant pool index.
final static int	FIXUP_DEFINE The definition of a label.
final static int	FIXUP_DELETE3 The offsets points to 3 bytes that should be deleted.
final static int	FIXUP_GOTO The offset points to a goto instruction. This case up to FIXUP_TRANSFER2 must be contiguous - see the jump-to-jump optimization in processFixups.
final static int	FIXUP_JSR The offset points to a jsr instruction.
final static int	FIXUP_LINE_NUMBER With preceding FIXUP_LINE_PC associates an offset with a line number. The fixup_offset is the line number; the fixup_label is null.
final static int	FIXUP_LINE_PC With following FIXUP_LINE_NUMBER associates an offset with a line number. The fixup_offset is the code location; the fixup_label is null.
final static int	FIXUP_MOVE The following instructions are moved to later in the code stream. Instead the instructions starting at the fixup label are patched here. (If the fixup label is null, we're done.) This allows re-arranging code to avoid unneeded gotos. The following instruction is the target of a later FIXUP_MOVE, and we'll insert then when we get to it.
final static int	FIXUP_MOVE_TO_END The following instructions are moved to the end of the code stream. Same as FIXUP_MOVE, but there is no explicit later FIXUP_MOVE that refers to the following instructions.
final static int	FIXUP_NONE Not a fixup - a no-op.
final static int	FIXUP_SWITCH The offset points to a tableswitch/lookupswitch - handle padding.
final static int	FIXUP_TRANSFER The offset points to a conditional transfer (if_xxx) instruction.
final static int	FIXUP_TRANSFER2 A FIXUP_GOTO_, FIXUP_JSR, or FIXUP_TRANSFER that uses a 2-byte offset.
final static int	FIXUP_TRY FIXUP_TRY with the following FIXUP_CATCH marks an exception handler. The label is the start of the try clause; the current offset marks the exception handler.
int	PC Current active length of code array. Note that processFixups may expand/contract the code array.
int	SP
Attribute	attributes
byte[]	code
short[]	exception_table
int	exception_table_length
int	fixup_count
Label[]	fixup_labels
int[]	fixup_offsets
IfState	if_stack The stack of currently active conditionals.
public static boolean	instructionLineMode If true we get a line number entry for each instruction. Normally false, but can be a convenient hack to allow instruction-level stepping/debugging and stacktraces.
LineNumbersAttr	lines
public LocalVarsAttr	locals
SourceDebugExtAttr	sourceDbgExt
Type[]	stack_types
TryState	try_stack The stack of currently active try statements.

Constructor Summary
public	CodeAttr(Method meth)

Method Summary
public void	addHandler(int start_pc, int end_pc, int handler_pc, int catch_type) Add an exception handler.
public void	addHandler(Label start_try, Label end_try, ClassType catch_type) Add an exception handler.
public Variable	addLocal(Type type) Add a new local variable (in the current scope). Parameters: type - type of the new Variable.
public Variable	addLocal(Type type, String name) Add a new local variable (in the current scope). Parameters: type - type of the new Variable. Parameters: name - name of the new Variable.
public void	addParamLocals() Call addLocal for parameters (as implied by method type).
public void	assignConstants(ClassType cl)
public int	beginFragment(Label start, Label after)
final public static String	calculateSplit(String str) Calculate how many CONSTANT_String constants we need for a string.
public static boolean	castNeeded(Type top, Type required)
public void	disAssemble(ClassTypeWriter dst, int start, int limit)
public void	doPendingFinalizers(TryState limit) Call pending finalizer functions.
final public void	emitAdd(char sig)
final public void	emitAdd(PrimType type)
final public void	emitAdd()
final public void	emitAnd()
final public void	emitArrayLength()
public void	emitArrayLoad(Type element_type) Load an element from an array.
public void	emitArrayStore(Type element_type) Store into an element of an array.
public void	emitCatchEnd()
public void	emitCatchStart(Variable var)
public void	emitCheckcast(Type type)
final public void	emitConvert(Type from, Type to)
final public void	emitDiv()
public void	emitDup() Emit code to duplicate the top element of the stack.
public void	emitDup(int size, int offset) Compile code to duplicate with offset.
public void	emitDup(int size) Compile code to duplicate the top 1 or 2 words.
public void	emitDup(Type type)
public void	emitDupX() Emit code to duplicate the top element of the stack and place the copy before the previous element.
final public void	emitElse() Compile start of else clause.
final public void	emitFi() Compile end of conditional.
public void	emitFinallyEnd()
public void	emitFinallyStart()
final public void	emitGetField(Field field) Compile code to get a non-static field value.
final public void	emitGetStatic(Field field) Compile code to get a static field value. Stack: ...
final public void	emitGoto(Label label) Compile an unconditional branch (goto).
final public void	emitGotoIfCompare1(Label label, int opcode)
final public void	emitGotoIfCompare2(Label label, int logop)
final public void	emitGotoIfEq(Label label, boolean invert)
final public void	emitGotoIfEq(Label label) Compile a conditional transfer if 2 top stack elements are equal.
final public void	emitGotoIfGe(Label label)
final public void	emitGotoIfGt(Label label)
final public void	emitGotoIfIntEqZero(Label label)
final public void	emitGotoIfIntGeZero(Label label)
final public void	emitGotoIfIntGtZero(Label label)
final public void	emitGotoIfIntLeZero(Label label)
final public void	emitGotoIfIntLtZero(Label label)
final public void	emitGotoIfIntNeZero(Label label)
final public void	emitGotoIfLe(Label label)
final public void	emitGotoIfLt(Label label)
final public void	emitGotoIfNE(Label label) Compile conditional transfer if 2 top stack elements are not equal.
final public void	emitIOr()
final public void	emitIfCompare1(int opcode) Compile start of a conditional: `if (!(x opcode 0)) ...`. The value of `x` must already have been pushed.
final public void	emitIfEq() Compile start of a conditional: if (x == y) ... The values of x and y must already have been pushed.
final public void	emitIfGe() Compile start of a conditional: if (x >= y) ... The values of x and y must already have been pushed.
final public void	emitIfGt() Compile start of a conditional: if (x > y) ... The values of x and y must already have been pushed.
final public void	emitIfIntCompare(int opcode) Compile start of a conditional: if (!(x OPCODE y)) ... The value of x and y must already have been pushed.
final public void	emitIfIntEqZero() Compile start of conditional: `if (x == 0) ...`. Also use this if you have pushed a boolean value: if (!b) ...
final public void	emitIfIntLEqZero() Compile start of conditional: `if (x <= 0)`.
final public void	emitIfIntLt()
final public void	emitIfIntNotZero() Compile start of conditional: `if (x != 0) ...`. Also use this if you have pushed a boolean value: if (b) ...
final public void	emitIfLe() Compile start of a conditional: if (x <= y) ... The values of x and y must already have been pushed.
final public void	emitIfLt() Compile start of a conditional: if (x < y) ... The values of x and y must already have been pushed.
final public void	emitIfNEq() Compile start of a conditional: if (x != y) ... The values of x and y must already have been pushed.
final public void	emitIfNotNull()
final public void	emitIfNull()
final public void	emitIfRefCompare1(int opcode) Compile start of a conditional: `if (!(x opcode null)) ...`. The value of `x` must already have been pushed and must be of reference type.
final public void	emitIfThen()
public void	emitInc(Variable var, short inc)
public void	emitInstanceof(Type type)
public void	emitInvoke(Method method)
public void	emitInvokeInterface(Method method)
public void	emitInvokeMethod(Method method, int opcode)
public void	emitInvokeSpecial(Method method)
public void	emitInvokeStatic(Method method) Compile a static method call.
public void	emitInvokeVirtual(Method method) Compile a virtual method call.
final public void	emitJsr(Label label)
final public void	emitLoad(Variable var) Compile code to push the contents of a local variable onto the statck.
void	emitMaybeWide(int opcode, int index)
final public void	emitMonitorEnter()
final public void	emitMonitorExit()
final public void	emitMul()
public void	emitNew(ClassType type) Invoke new on a class type.
void	emitNewArray(int type_code)
public void	emitNewArray(Type element_type, int dims) Compile code to allocate a new array.
public void	emitNewArray(Type element_type)
final public void	emitNot(Type type)
public void	emitPop(int nvalues) Compile code to pop values off the stack (and ignore them).
public void	emitPrimop(int opcode, int arg_count, Type retType)
final public void	emitPushClass(String name) Push a class constant pool entry. This is only supported by JDK 1.5 and later.
final public void	emitPushConstant(int val, Type type)
final public void	emitPushConstant(CpoolEntry cnst)
public void	emitPushDouble(double x)
public void	emitPushFloat(float x)
final public void	emitPushInt(int i)
public void	emitPushLong(long i)
public void	emitPushNull()
final public void	emitPushPrimArray(Object value, ArrayType arrayType) Emit code to push a constant primitive array.
final public void	emitPushString(String str) Emit code to push the value of a constant String.
final public void	emitPushThis()
final public void	emitPutField(Field field) Compile code to put a non-static field value. Stack: ..., objectref, value => ...
final public void	emitPutStatic(Field field) Compile code to put a static field value. Stack: ..., value => ...
final public void	emitRem()
public void	emitRet(Variable var) Emit a 'ret' instruction.
final public void	emitReturn() Compile a method return.
final public void	emitShl()
final public void	emitShr()
public void	emitStore(Variable var)
final public void	emitSub(char sig)
final public void	emitSub(PrimType type)
final public void	emitSub()
public void	emitSwap()
public void	emitTailCall(boolean pop_args, Scope scope) Compile a tail-call to position 0 of the current procedure. Parameters: pop_args - if true, copy argument registers (except this) from stack. Parameters: scope - Scope whose start we jump back to.
final public void	emitThen()
final public void	emitThrow()
final void	emitTransfer(Label label, int opcode)
public void	emitTryCatchEnd()
public void	emitTryEnd()
public void	emitTryStart(boolean has_finally, Type result_type)
final public void	emitUshr()
public void	emitWithCleanupCatch(Variable catchVar) Called after a `body` that has a `cleanup` clause.
public void	emitWithCleanupDone() Called after generating a `cleanup` handler.
public void	emitWithCleanupStart() Beginning of code that has a cleanup handler. This is similar to a try-finally, but the cleanup is only done in the case of an exception.
final public void	emitXOr()
public void	endFragment(int cookie) End a fragment.
public void	enterScope(Scope scope)
final public void	fixupAdd(int kind, Label label) Add a fixup at this location. Parameters: kind - one of the FIXUP_xxx codes. Parameters: label - varies - typically the target of jump.
final void	fixupAdd(int kind, int offset, Label label)
final public void	fixupChain(Label here, Label target) This causes a later processFixup to rearrange the code. The code at target comes here, instead of the following instructions. Fuctionally equivalent to: `goto target; here:`, but implemented by code re-arranging.
public Variable	getArg(int index) Get the index'th parameter.
final public Attribute	getAttributes()
public byte[]	getCode() Get the code (instruction bytes) of this method. Does not make a copy.
public int	getCodeLength() Set the current lengthof the code (instruction bytes) of this method.
final public ConstantPool	getConstants()
public Scope	getCurrentScope()
final public TryState	getCurrentTry()
public Label	getLabel() Get a new Label for the current location.
final public int	getLength()
public int	getMaxLocals() Get the maximum number of local variable words in this method.
public int	getMaxStack() Get the maximum number of words on the operand stack in this method.
final public Method	getMethod()
final public int	getPC()
final public int	getSP()
byte	invert_opcode(byte opcode) Get opcode that implements NOT (x OPCODE y).
final public boolean	isInTry()
public Variable	lookup(String name)
public Scope	popScope()
final public Type	popType()
public void	print(ClassTypeWriter dst)
public void	processFixups()
public Scope	pushScope()
final public void	pushType(Type type)
final public void	put1(int i) Write an 8-bit byte to the current code-stream.
final public void	put2(int i)
final public void	put4(int i)
final public void	putIndex2(CpoolEntry cnst)
final public void	putLineNumber(String filename, int linenumber)
final public void	putLineNumber(int linenumber)
final public boolean	reachableHere() True if control could reach here.
final public void	reserve(int bytes)
public void	restoreStackTypeState(Type[] save) Restore a type state as saved by saveStackTypeState.
public Type[]	saveStackTypeState(boolean clear) Return an object encapsulating the type state of the JVM stack.
final public void	setAttributes(Attribute attributes)
public void	setCode(byte[] code) Set the code (instruction bytes) of this method. Parameters: code - the code bytes (which are not copied).Implicitly calls setCodeLength(code.length).
public void	setCodeLength(int len) Set the length the the code (instruction bytes) of this method.
public void	setMaxLocals(int n) Set the maximum number of local variable words in this method.
public void	setMaxStack(int n) Set the maximum number of words on the operand stack in this method.
final public void	setReachable(boolean val)
final public void	setUnreachable()
final public Type	topType()
public void	write(DataOutputStream dstr)

Field Detail

FIXUP_CASE
final static int FIXUP_CASE(Code)
	The offset contains a label relative to the previous FIXUP_SWITCH.

FIXUP_CATCH
final static int FIXUP_CATCH(Code)
	Second half of a FIXUP_TRY/FIXUP_CATCH pair. The label is the ed of the try clause; the current offset is the exception type as a constant pool index.

FIXUP_DEFINE
final static int FIXUP_DEFINE(Code)
	The definition of a label.

FIXUP_DELETE3
final static int FIXUP_DELETE3(Code)
	The offsets points to 3 bytes that should be deleted.

FIXUP_GOTO
final static int FIXUP_GOTO(Code)
	The offset points to a goto instruction. This case up to FIXUP_TRANSFER2 must be contiguous - see the jump-to-jump optimization in processFixups.

FIXUP_JSR
final static int FIXUP_JSR(Code)
	The offset points to a jsr instruction.

FIXUP_LINE_NUMBER
final static int FIXUP_LINE_NUMBER(Code)
	With preceding FIXUP_LINE_PC associates an offset with a line number. The fixup_offset is the line number; the fixup_label is null.

FIXUP_LINE_PC
final static int FIXUP_LINE_PC(Code)
	With following FIXUP_LINE_NUMBER associates an offset with a line number. The fixup_offset is the code location; the fixup_label is null.

FIXUP_MOVE
final static int FIXUP_MOVE(Code)
	The following instructions are moved to later in the code stream. Instead the instructions starting at the fixup label are patched here. (If the fixup label is null, we're done.) This allows re-arranging code to avoid unneeded gotos. The following instruction is the target of a later FIXUP_MOVE, and we'll insert then when we get to it.

FIXUP_MOVE_TO_END
final static int FIXUP_MOVE_TO_END(Code)
	The following instructions are moved to the end of the code stream. Same as FIXUP_MOVE, but there is no explicit later FIXUP_MOVE that refers to the following instructions. Created by beginFragment. The fixup_offset points to the end of the fragment. (The first processFixups patches these to FIXUP_MOVE.)

FIXUP_NONE
final static int FIXUP_NONE(Code)
	Not a fixup - a no-op.

FIXUP_SWITCH
final static int FIXUP_SWITCH(Code)
	The offset points to a tableswitch/lookupswitch - handle padding.

FIXUP_TRANSFER
final static int FIXUP_TRANSFER(Code)
	The offset points to a conditional transfer (if_xxx) instruction.

FIXUP_TRANSFER2
final static int FIXUP_TRANSFER2(Code)
	A FIXUP_GOTO_, FIXUP_JSR, or FIXUP_TRANSFER that uses a 2-byte offset.

FIXUP_TRY
final static int FIXUP_TRY(Code)
	FIXUP_TRY with the following FIXUP_CATCH marks an exception handler. The label is the start of the try clause; the current offset marks the exception handler.

PC
int PC(Code)
	Current active length of code array. Note that processFixups may expand/contract the code array.

SP
int SP(Code)

attributes
Attribute attributes(Code)

code
byte[] code(Code)

exception_table
short[] exception_table(Code)

exception_table_length
int exception_table_length(Code)

fixup_count
int fixup_count(Code)

fixup_labels
Label[] fixup_labels(Code)

fixup_offsets
int[] fixup_offsets(Code)

if_stack
IfState if_stack(Code)
	The stack of currently active conditionals.

instructionLineMode
public static boolean instructionLineMode(Code)
	If true we get a line number entry for each instruction. Normally false, but can be a convenient hack to allow instruction-level stepping/debugging and stacktraces. In this case LINE==PC .

lines
LineNumbersAttr lines(Code)

locals
public LocalVarsAttr locals(Code)

sourceDbgExt
SourceDebugExtAttr sourceDbgExt(Code)

stack_types
Type[] stack_types(Code)

try_stack
TryState try_stack(Code)
	The stack of currently active try statements.

Constructor Detail

CodeAttr
public CodeAttr(Method meth)(Code)

Method Detail

addHandler
public void addHandler(int start_pc, int end_pc, int handler_pc, int catch_type)(Code)
	Add an exception handler.

addHandler
public void addHandler(Label start_try, Label end_try, ClassType catch_type)(Code)
	Add an exception handler.

addLocal
public Variable addLocal(Type type)(Code)
	Add a new local variable (in the current scope). Parameters: type - type of the new Variable. the new Variable.

addLocal
public Variable addLocal(Type type, String name)(Code)
	Add a new local variable (in the current scope). Parameters: type - type of the new Variable. Parameters: name - name of the new Variable. the new Variable.

addParamLocals
public void addParamLocals()(Code)
	Call addLocal for parameters (as implied by method type).

assignConstants
public void assignConstants(ClassType cl)(Code)

beginFragment
public int beginFragment(Label start, Label after)(Code)

calculateSplit
final public static String calculateSplit(String str)(Code)
	Calculate how many CONSTANT_String constants we need for a string. Each CONSTANT_String can be at most 0xFFFF bytes (as a UTF8 string). Returns a String, where each char, coerced to an int, is the length of a substring of the input that is at most 0xFFFF bytes.

castNeeded
public static boolean castNeeded(Type top, Type required)(Code)

disAssemble
public void disAssemble(ClassTypeWriter dst, int start, int limit)(Code)

doPendingFinalizers
public void doPendingFinalizers(TryState limit)(Code)
	Call pending finalizer functions. Parameters: limit - Only call finalizers more recent than this.

emitAdd
final public void emitAdd(char sig)(Code)

emitAdd
final public void emitAdd(PrimType type)(Code)

emitAdd
final public void emitAdd()(Code)

emitAnd
final public void emitAnd()(Code)

emitArrayLength
final public void emitArrayLength()(Code)

emitArrayLoad
public void emitArrayLoad(Type element_type)(Code)
	Load an element from an array. Must already have pushed the array and the index (in that order): Stack: ..., array, index => ..., value

emitArrayStore
public void emitArrayStore(Type element_type)(Code)
	Store into an element of an array. Must already have pushed the array reference, the index, and the new value (in that order). Stack: ..., array, index, value => ...

emitCatchEnd
public void emitCatchEnd()(Code)

emitCatchStart
public void emitCatchStart(Variable var)(Code)

emitCheckcast
public void emitCheckcast(Type type)(Code)

emitConvert
final public void emitConvert(Type from, Type to)(Code)

emitDiv
final public void emitDiv()(Code)

emitDup
public void emitDup()(Code)
	Emit code to duplicate the top element of the stack.

emitDup
public void emitDup(int size, int offset)(Code)
	Compile code to duplicate with offset. Parameters: size - the size of the stack item to duplicate (1 or 2) Parameters: offset - where to insert the result (must be 0, 1, or 2)The new words get inserted at stack[SP-size-offset]

emitDup
public void emitDup(int size)(Code)
	Compile code to duplicate the top 1 or 2 words. Parameters: size - number of words to duplicate

emitDup
public void emitDup(Type type)(Code)

emitDupX
public void emitDupX()(Code)
	Emit code to duplicate the top element of the stack and place the copy before the previous element.

emitElse
final public void emitElse()(Code)
	Compile start of else clause.

emitFi
final public void emitFi()(Code)
	Compile end of conditional.

emitFinallyEnd
public void emitFinallyEnd()(Code)

emitFinallyStart
public void emitFinallyStart()(Code)

emitGetField
final public void emitGetField(Field field)(Code)
	Compile code to get a non-static field value. Stack: ..., objectref => ..., value

emitGetStatic
final public void emitGetStatic(Field field)(Code)
	Compile code to get a static field value. Stack: ... => ..., value

emitGoto
final public void emitGoto(Label label)(Code)
	Compile an unconditional branch (goto). Parameters: label - target of the branch (must be in this method).

emitGotoIfCompare1
final public void emitGotoIfCompare1(Label label, int opcode)(Code)

emitGotoIfCompare2
final public void emitGotoIfCompare2(Label label, int logop)(Code)

emitGotoIfEq
final public void emitGotoIfEq(Label label, boolean invert)(Code)

emitGotoIfEq
final public void emitGotoIfEq(Label label)(Code)
	Compile a conditional transfer if 2 top stack elements are equal.

emitGotoIfGe
final public void emitGotoIfGe(Label label)(Code)

emitGotoIfGt
final public void emitGotoIfGt(Label label)(Code)

emitGotoIfIntEqZero
final public void emitGotoIfIntEqZero(Label label)(Code)

emitGotoIfIntGeZero
final public void emitGotoIfIntGeZero(Label label)(Code)

emitGotoIfIntGtZero
final public void emitGotoIfIntGtZero(Label label)(Code)

emitGotoIfIntLeZero
final public void emitGotoIfIntLeZero(Label label)(Code)

emitGotoIfIntLtZero
final public void emitGotoIfIntLtZero(Label label)(Code)

emitGotoIfIntNeZero
final public void emitGotoIfIntNeZero(Label label)(Code)

emitGotoIfLe
final public void emitGotoIfLe(Label label)(Code)

emitGotoIfLt
final public void emitGotoIfLt(Label label)(Code)

emitGotoIfNE
final public void emitGotoIfNE(Label label)(Code)
	Compile conditional transfer if 2 top stack elements are not equal.

emitIOr
final public void emitIOr()(Code)

emitIfCompare1
final public void emitIfCompare1(int opcode)(Code)
	Compile start of a conditional: `if (!(x opcode 0)) ...`. The value of `x` must already have been pushed.

emitIfEq
final public void emitIfEq()(Code)
	Compile start of a conditional: if (x == y) ... The values of x and y must already have been pushed.

emitIfGe
final public void emitIfGe()(Code)
	Compile start of a conditional: if (x >= y) ... The values of x and y must already have been pushed.

emitIfGt
final public void emitIfGt()(Code)
	Compile start of a conditional: if (x > y) ... The values of x and y must already have been pushed.

emitIfIntCompare
final public void emitIfIntCompare(int opcode)(Code)
	Compile start of a conditional: if (!(x OPCODE y)) ... The value of x and y must already have been pushed.

emitIfIntEqZero
final public void emitIfIntEqZero()(Code)
	Compile start of conditional: `if (x == 0) ...`. Also use this if you have pushed a boolean value: if (!b) ...

emitIfIntLEqZero
final public void emitIfIntLEqZero()(Code)
	Compile start of conditional: `if (x <= 0)`.

emitIfIntLt
final public void emitIfIntLt()(Code)

emitIfIntNotZero
final public void emitIfIntNotZero()(Code)
	Compile start of conditional: `if (x != 0) ...`. Also use this if you have pushed a boolean value: if (b) ...

emitIfLe
final public void emitIfLe()(Code)
	Compile start of a conditional: if (x <= y) ... The values of x and y must already have been pushed.

emitIfLt
final public void emitIfLt()(Code)
	Compile start of a conditional: if (x < y) ... The values of x and y must already have been pushed.

emitIfNEq
final public void emitIfNEq()(Code)
	Compile start of a conditional: if (x != y) ... The values of x and y must already have been pushed.

emitIfNotNull
final public void emitIfNotNull()(Code)
	Compile start of conditional: if (x != null)

emitIfNull
final public void emitIfNull()(Code)
	Compile start of conditional: if (x == null)

emitIfRefCompare1
final public void emitIfRefCompare1(int opcode)(Code)
	Compile start of a conditional: `if (!(x opcode null)) ...`. The value of `x` must already have been pushed and must be of reference type.

emitIfThen
final public void emitIfThen()(Code)

emitInc
public void emitInc(Variable var, short inc)(Code)

emitInstanceof
public void emitInstanceof(Type type)(Code)

emitInvoke
public void emitInvoke(Method method)(Code)

emitInvokeInterface
public void emitInvokeInterface(Method method)(Code)

emitInvokeMethod
public void emitInvokeMethod(Method method, int opcode)(Code)

emitInvokeSpecial
public void emitInvokeSpecial(Method method)(Code)

emitInvokeStatic
public void emitInvokeStatic(Method method)(Code)
	Compile a static method call. The stack contains the the arguments in order. Parameters: method - the static method to invoke

emitInvokeVirtual
public void emitInvokeVirtual(Method method)(Code)
	Compile a virtual method call. The stack contains the 'this' object, followed by the arguments in order. Parameters: method - the method to invoke virtually

emitJsr
final public void emitJsr(Label label)(Code)

emitLoad
final public void emitLoad(Variable var)(Code)
	Compile code to push the contents of a local variable onto the statck. Parameters: var - The variable whose contents we want to push.

emitMaybeWide
void emitMaybeWide(int opcode, int index)(Code)

emitMonitorEnter
final public void emitMonitorEnter()(Code)

emitMonitorExit
final public void emitMonitorExit()(Code)

emitMul
final public void emitMul()(Code)

emitNew
public void emitNew(ClassType type)(Code)
	Invoke new on a class type. Does not call the constructor! Parameters: type - the desired new object type

emitNewArray
void emitNewArray(int type_code)(Code)

emitNewArray
public void emitNewArray(Type element_type, int dims)(Code)
	Compile code to allocate a new array. The size should have been already pushed on the stack. Parameters: element_type - type of the array elements

emitNewArray
public void emitNewArray(Type element_type)(Code)

emitNot
final public void emitNot(Type type)(Code)

emitPop
public void emitPop(int nvalues)(Code)
	Compile code to pop values off the stack (and ignore them). Parameters: nvalues - the number of values (not words) to pop

emitPrimop
public void emitPrimop(int opcode, int arg_count, Type retType)(Code)

emitPushClass
final public void emitPushClass(String name)(Code)
	Push a class constant pool entry. This is only supported by JDK 1.5 and later.

emitPushConstant
final public void emitPushConstant(int val, Type type)(Code)

emitPushConstant
final public void emitPushConstant(CpoolEntry cnst)(Code)

emitPushDouble
public void emitPushDouble(double x)(Code)

emitPushFloat
public void emitPushFloat(float x)(Code)

emitPushInt
final public void emitPushInt(int i)(Code)

emitPushLong
public void emitPushLong(long i)(Code)

emitPushNull
public void emitPushNull()(Code)

emitPushPrimArray
final public void emitPushPrimArray(Object value, ArrayType arrayType)(Code)
	Emit code to push a constant primitive array. Parameters: value - The array value that we want the emitted code to re-create. Parameters: arrayType - The ArrayType that matches value.

emitPushString
final public void emitPushString(String str)(Code)
	Emit code to push the value of a constant String. Uses CONSTANT_String and CONSTANT_Utf8 constant pool entries as needed. Can handle Strings whose UTF8 length is greates than 0xFFFF bytes (the limit of a CONSTANT_Utf8) by generating String concatenation.

emitPushThis
final public void emitPushThis()(Code)

emitPutField
final public void emitPutField(Field field)(Code)
	Compile code to put a non-static field value. Stack: ..., objectref, value => ...

emitPutStatic
final public void emitPutStatic(Field field)(Code)
	Compile code to put a static field value. Stack: ..., value => ...

emitRem
final public void emitRem()(Code)

emitRet
public void emitRet(Variable var)(Code)
	Emit a 'ret' instruction. Parameters: var - the variable containing the return address

emitReturn
final public void emitReturn()(Code)
	Compile a method return. If inside a 'catch' clause, first call 'finally' clauses. The return value (unless the return type is void) must be on the stack, and have the correct type.

emitShl
final public void emitShl()(Code)

emitShr
final public void emitShr()(Code)

emitStore
public void emitStore(Variable var)(Code)

emitSub
final public void emitSub(char sig)(Code)

emitSub
final public void emitSub(PrimType type)(Code)

emitSub
final public void emitSub()(Code)

emitSwap
public void emitSwap()(Code)

emitTailCall
public void emitTailCall(boolean pop_args, Scope scope)(Code)
	Compile a tail-call to position 0 of the current procedure. Parameters: pop_args - if true, copy argument registers (except this) from stack. Parameters: scope - Scope whose start we jump back to.

emitThen
final public void emitThen()(Code)

emitThrow
final public void emitThrow()(Code)

emitTransfer
final void emitTransfer(Label label, int opcode)(Code)

emitTryCatchEnd
public void emitTryCatchEnd()(Code)

emitTryEnd
public void emitTryEnd()(Code)

emitTryStart
public void emitTryStart(boolean has_finally, Type result_type)(Code)

emitUshr
final public void emitUshr()(Code)

emitWithCleanupCatch
public void emitWithCleanupCatch(Variable catchVar)(Code)
	Called after a `body` that has a `cleanup` clause. Followed by the `cleanup` code.

emitWithCleanupDone
public void emitWithCleanupDone()(Code)
	Called after generating a `cleanup` handler.

emitWithCleanupStart
public void emitWithCleanupStart()(Code)
	Beginning of code that has a cleanup handler. This is similar to a try-finally, but the cleanup is only done in the case of an exception. Alternatively, the try clause has to manually do the cleanup with code duplication. Equivalent to: `try body catch (Throwable ex) { cleanup; throw ex; }` Call `emitWithCleanupStart` before the `body`.

emitXOr
final public void emitXOr()(Code)

endFragment
public void endFragment(int cookie)(Code)
	End a fragment. Parameters: cookie - the return value from the previous beginFragment.

enterScope
public void enterScope(Scope scope)(Code)

fixupAdd
final public void fixupAdd(int kind, Label label)(Code)
	Add a fixup at this location. Parameters: kind - one of the FIXUP_xxx codes. Parameters: label - varies - typically the target of jump.

fixupAdd
final void fixupAdd(int kind, int offset, Label label)(Code)

fixupChain
final public void fixupChain(Label here, Label target)(Code)
	This causes a later processFixup to rearrange the code. The code at target comes here, instead of the following instructions. Fuctionally equivalent to: `goto target; here:`, but implemented by code re-arranging. Therefore there should be at some later point a `goto here; target:`.

getArg
public Variable getArg(int index)(Code)
	Get the index'th parameter.

getAttributes
final public Attribute getAttributes()(Code)

getCode
public byte[] getCode()(Code)
	Get the code (instruction bytes) of this method. Does not make a copy.

getCodeLength
public int getCodeLength()(Code)
	Set the current lengthof the code (instruction bytes) of this method.

getConstants
final public ConstantPool getConstants()(Code)

getCurrentScope
public Scope getCurrentScope()(Code)

getCurrentTry
final public TryState getCurrentTry()(Code)

getLabel
public Label getLabel()(Code)
	Get a new Label for the current location. Unlike Label.define, Does not change reachableHere().

getLength
final public int getLength()(Code)

getMaxLocals
public int getMaxLocals()(Code)
	Get the maximum number of local variable words in this method.

getMaxStack
public int getMaxStack()(Code)
	Get the maximum number of words on the operand stack in this method.

getMethod
final public Method getMethod()(Code)

getPC
final public int getPC()(Code)

getSP
final public int getSP()(Code)

invert_opcode
byte invert_opcode(byte opcode)(Code)
	Get opcode that implements NOT (x OPCODE y).

isInTry
final public boolean isInTry()(Code)

lookup
public Variable lookup(String name)(Code)
	Search by name for a Variable Parameters: name - name to search for the Variable, or null if not found (in any scope of this Method).

popScope
public Scope popScope()(Code)

popType
final public Type popType()(Code)

print
public void print(ClassTypeWriter dst)(Code)

processFixups
public void processFixups()(Code)

pushScope
public Scope pushScope()(Code)

pushType
final public void pushType(Type type)(Code)

put1
final public void put1(int i)(Code)
	Write an 8-bit byte to the current code-stream. Parameters: i - the byte to write

put2
final public void put2(int i)(Code)
	Write a 16-bit short to the current code-stream Parameters: i - the value to write

put4
final public void put4(int i)(Code)
	Write a 32-bit int to the current code-stream Parameters: i - the value to write

putIndex2
final public void putIndex2(CpoolEntry cnst)(Code)

putLineNumber
final public void putLineNumber(String filename, int linenumber)(Code)

putLineNumber
final public void putLineNumber(int linenumber)(Code)

reachableHere
final public boolean reachableHere()(Code)
	True if control could reach here.

reserve
final public void reserve(int bytes)(Code)

restoreStackTypeState
public void restoreStackTypeState(Type[] save)(Code)
	Restore a type state as saved by saveStackTypeState.

saveStackTypeState
public Type[] saveStackTypeState(boolean clear)(Code)
	Return an object encapsulating the type state of the JVM stack.

setAttributes
final public void setAttributes(Attribute attributes)(Code)

setCode
public void setCode(byte[] code)(Code)
	Set the code (instruction bytes) of this method. Parameters: code - the code bytes (which are not copied).Implicitly calls setCodeLength(code.length).

setCodeLength
public void setCodeLength(int len)(Code)
	Set the length the the code (instruction bytes) of this method. That is the number of current used bytes in getCode(). (Any remaing bytes provide for future growth.)

setMaxLocals
public void setMaxLocals(int n)(Code)
	Set the maximum number of local variable words in this method.

setMaxStack
public void setMaxStack(int n)(Code)
	Set the maximum number of words on the operand stack in this method.

setReachable
final public void setReachable(boolean val)(Code)

setUnreachable
final public void setUnreachable()(Code)

topType
final public Type topType()(Code)

write
public void write(DataOutputStream dstr) throws java.io.IOException(Code)

Fields inherited from gnu.bytecode.Attribute

AttrContainer container(Code)(Java Doc)
String name(Code)(Java Doc)
int name_index(Code)(Java Doc)
Attribute next(Code)(Java Doc)

Methods inherited from gnu.bytecode.Attribute

public void addToFrontOf(AttrContainer container)(Code)(Java Doc)
public void assignConstants(ClassType cl)(Code)(Java Doc)
public static void assignConstants(AttrContainer container, ClassType cl)(Code)(Java Doc)
public static int count(AttrContainer container)(Code)(Java Doc)
public static Attribute get(AttrContainer container, String name)(Code)(Java Doc)
final public AttrContainer getContainer()(Code)(Java Doc)
abstract public int getLength()(Code)(Java Doc)
public static int getLengthAll(AttrContainer container)(Code)(Java Doc)
final public String getName()(Code)(Java Doc)
final public int getNameIndex()(Code)(Java Doc)
final public Attribute getNext()(Code)(Java Doc)
final public boolean isSkipped()(Code)(Java Doc)
public void print(ClassTypeWriter dst)(Code)(Java Doc)
final public void setContainer(AttrContainer container)(Code)(Java Doc)
final public void setName(String name)(Code)(Java Doc)
final public void setNameIndex(int index)(Code)(Java Doc)
final public void setNext(Attribute next)(Code)(Java Doc)
final public void setSkipped(boolean skip)(Code)(Java Doc)
final public void setSkipped()(Code)(Java Doc)
abstract public void write(DataOutputStream dstr) throws java.io.IOException(Code)(Java Doc)
public static void writeAll(AttrContainer container, DataOutputStream dstr) throws java.io.IOException(Code)(Java Doc)

Methods inherited from java.lang.Object

native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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