@ -22,6 +22,20 @@ package jode.bytecode;
/ * *
* This class represents an instruction in the byte code .
*
* We only allow a subset of opcodes . Other opcodes are mapped to
* their simpler version . When writing the bytecode the shortest
* possible bytecode is produced .
*
* The opcodes we map are :
* < pre >
* [ iflda ] load_x - & gt ; [ iflda ] load
* [ iflda ] store_x - & gt ; [ iflda ] store
* [ ifa ] const_xx , ldc_w - & gt ; ldc
* [ dl ] const_xx - & gt ; ldc2_w
* wide opcode - & gt ; opcode
* tableswitch - & gt ; lookupswitch
* [ a ] newarray - & gt ; multianewarray
* < / pre >
* /
public class Instruction implements Opcodes {
/ * *
@ -32,80 +46,173 @@ public class Instruction implements Opcodes{
* /
private int lineAndOpcode ;
/ * *
* Creates a new simple Instruction with no parameters . We map
* some opcodes , so you must always use the mapped opcode .
* @param opcode the opcode of this instruction .
* @exception IllegalArgumentException if opcode is not in our subset
* or if opcode needs a parameter . * /
public static Instruction forOpcode ( int opcode ) {
switch ( opcode ) {
case opc_nop :
case opc_iaload : case opc_laload : case opc_faload :
case opc_daload : case opc_aaload :
case opc_baload : case opc_caload : case opc_saload :
case opc_iastore : case opc_lastore : case opc_fastore :
case opc_dastore : case opc_aastore :
case opc_bastore : case opc_castore : case opc_sastore :
case opc_pop : case opc_pop2 :
case opc_dup : case opc_dup_x1 : case opc_dup_x2 :
case opc_dup2 : case opc_dup2_x1 : case opc_dup2_x2 :
case opc_swap :
case opc_iadd : case opc_ladd : case opc_fadd : case opc_dadd :
case opc_isub : case opc_lsub : case opc_fsub : case opc_dsub :
case opc_imul : case opc_lmul : case opc_fmul : case opc_dmul :
case opc_idiv : case opc_ldiv : case opc_fdiv : case opc_ddiv :
case opc_irem : case opc_lrem : case opc_frem : case opc_drem :
case opc_ineg : case opc_lneg : case opc_fneg : case opc_dneg :
case opc_ishl : case opc_lshl :
case opc_ishr : case opc_lshr :
case opc_iushr : case opc_lushr :
case opc_iand : case opc_land :
case opc_ior : case opc_lor :
case opc_ixor : case opc_lxor :
case opc_i2l : case opc_i2f : case opc_i2d :
case opc_l2i : case opc_l2f : case opc_l2d :
case opc_f2i : case opc_f2l : case opc_f2d :
case opc_d2i : case opc_d2l : case opc_d2f :
case opc_i2b : case opc_i2c : case opc_i2s :
case opc_lcmp : case opc_fcmpl : case opc_fcmpg :
case opc_dcmpl : case opc_dcmpg :
case opc_ireturn : case opc_lreturn :
case opc_freturn : case opc_dreturn : case opc_areturn :
case opc_return :
case opc_athrow :
case opc_arraylength :
case opc_monitorenter : case opc_monitorexit :
case opc_goto :
case opc_jsr :
case opc_ifeq : case opc_ifne :
case opc_iflt : case opc_ifge :
case opc_ifgt : case opc_ifle :
case opc_if_icmpeq : case opc_if_icmpne :
case opc_if_icmplt : case opc_if_icmpge :
case opc_if_icmpgt : case opc_if_icmple :
case opc_if_acmpeq : case opc_if_acmpne :
case opc_ifnull : case opc_ifnonnull :
return new Instruction ( opcode ) ;
default :
throw new IllegalArgumentException ( "Instruction has a parameter" ) ;
}
}
/ * *
* Creates a new ldc Instruction .
* @param opcode the opcode of this instruction .
* @param constant the constant parameter .
* @exception IllegalArgumentException if opcode is not opc_ldc or
* opc_ldc2_w .
* /
public Instruction forOpcode ( int opcode , Object constant ) {
if ( opcode = = opc_ldc | | opcode = = opc_ldc2_w )
return new ConstantInstruction ( opcode , constant ) ;
throw new IllegalArgumentException ( "Instruction has no constant" ) ;
}
/ * *
* Creates a new Instruction with a local variable as parameter .
* @param opcode the opcode of this instruction .
* @param lvi the local variable parameter .
* @exception IllegalArgumentException if opcode is not in our subset
* or if opcode doesn ' t need a single local variable as parameter .
* /
public static Instruction forOpcode ( int opcode , LocalVariableInfo lvi ) {
if ( opcode = = opc_ret
| | opcode > = opc_iload & & opcode < = opc_aload
| | opcode > = opc_istore & & opcode < = opc_astore )
return new SlotInstruction ( opcode , lvi ) ;
throw new IllegalArgumentException ( "Instruction has no slot" ) ;
}
/ * *
* Creates a new Instruction with reference as parameter .
* @param opcode the opcode of this instruction .
* @param reference the reference parameter .
* @exception IllegalArgumentException if opcode is not in our subset
* or if opcode doesn ' t need a reference as parameter .
* /
public static Instruction forOpcode ( int opcode , Reference reference ) {
if ( opcode > = opc_getstatic & & opcode < = opc_invokeinterface )
return new ReferenceInstruction ( opcode , reference ) ;
throw new IllegalArgumentException ( "Instruction has no reference" ) ;
}
/ * *
* Creates a new Instruction with type signature as parameter .
* @param opcode the opcode of this instruction .
* @param typeSig the type signature parameter .
* @exception IllegalArgumentException if opcode is not in our subset
* or if opcode doesn ' t need a type signature as parameter .
* /
public static Instruction forOpcode ( int opcode , String typeSig ) {
switch ( opcode ) {
case opc_new :
case opc_checkcast :
case opc_instanceof :
return new TypeInstruction ( opcode , typeSig ) ;
default :
throw new IllegalArgumentException ( "Instruction has no type" ) ;
}
}
// /**
// * Optional object data for this opcode. There are six different
// * usages of this field:
// * <dl>
// * <dt>opc_ldc / opc_ldc2_w</dt>
// * <dd>The constant of type Integer/Long/Float/Double/String. </dd>
// * <dt>opc_invokexxx / opc_xxxfield / opc_xxxstatic</dt>
// * <dd>The field/method Reference</dd>
// * <dt>opc_new / opc_checkcast / opc_instanceof</dt>
// * <dd>The typesignature of the class/array</dd>
// * <dt>opc_lookupswitch</dt>
// * <dd>The array of values of type int[]</dd>
// * <dt>opc_multianewarray</dt>
// * <dd>A DoubleParam: intValue contains dimension, objValue contains
// * reference </dd>
// * <dt>opc_[aildf]{load,store}</dt>
// * <dd>The LocalVariableInfo</dd>
// * <dt>opc_iinc</dt>
// * <dd>A DoubleParam: intValue contains count, objValue contains
// * local variable info.</dd>
// * </dl>
// */
// private Object param;
// /**
// * Create a new Instruction suitable for the given opcode. We map
// * some opcodes, so you must always use the mapped opcode.
// * <pre>
// * [iflda]load_x -> [iflda]load
// * [iflda]store_x -> [iflda]store
// * [ifa]const_xx, ldc_w -> ldc
// * [dl]const_xx -> ldc2_w
// * wide opcode -> opcode
// * tableswitch -> lookupswitch
// * [a]newarray -> multianewarray
// * </pre>
// */
// public static Instruction forOpcode(int opcode) {
// if (opcode == opc_iinc)
// return new IncInstruction(opcode);
// else if (opcode == opc_ret
// || opcode >= opc_iload && opcode <= opc_aload
// || opcode >= opc_istore && opcode <= opc_astore)
// return new SlotInstruction(opcode);
// else if (opcode >= opc_getstatic && opcode <= opc_invokeinterface)
// return new ReferenceInstruction(opcode);
// else switch (opcode) {
// case opc_new:
// case opc_checkcast:
// case opc_instanceof:
// return new TypeInstruction(opcode);
// case opc_multianewarray:
// return new TypeDimensionInstruction(opcode);
// default:
// return new Instruction(opcode);
// }
// }
/ * *
* Creates a new switch Instruction .
* @param opcode the opcode of this instruction must be opc_lookupswitch .
* @param values an array containing the different cases .
* @exception IllegalArgumentException if opcode is not opc_lookupswitch .
* /
public static Instruction forOpcode ( int opcode , int [ ] values ) {
if ( opcode = = opc_lookupswitch )
return new SwitchInstruction ( opcode , values ) ;
throw new IllegalArgumentException ( "Instruction has no values" ) ;
}
/ * *
* Standard constructor : creates an opcode with parameter and
* lineNr .
* Creates a new increment Instruction .
* @param opcode the opcode of this instruction .
* @param lvi the local variable parameter .
* @param increment the increment parameter .
* @exception IllegalArgumentException if opcode is not opc_iinc .
* /
public Instruction ( int opcode , int lineNr ) {
if ( stackDelta . charAt ( opcode ) = = ' \ 177 ' )
throw new IllegalArgumentException ( "Unknown opcode: " + opcode ) ;
this . lineAndOpcode = ( lineNr < < 8 ) | opcode ;
public static Instruction forOpcode ( int opcode ,
LocalVariableInfo lvi , int increment ) {
if ( opcode = = opc_iinc )
return new IncInstruction ( opcode , lvi , increment ) ;
throw new IllegalArgumentException ( "Instruction has no increment" ) ;
}
/ * *
* Creates a new Instruction with type signature and a dimension
* as parameter .
* @param opcode the opcode of this instruction .
* @param typeSig the type signature parameter .
* @param dimension the array dimension parameter .
* @exception IllegalArgumentException if opcode is not
* opc_multianewarray .
* /
public static Instruction forOpcode ( int opcode ,
String typeSig , int dimension ) {
if ( opcode = = opc_multianewarray )
return new TypeDimensionInstruction ( opcode , typeSig , dimension ) ;
throw new IllegalArgumentException ( "Instruction has no dimension" ) ;
}
/ * *
* Creates a simple opcode , without any parameters .
* /
public Instruction ( int opcode ) {
this ( opcode , - 1 ) ;
Instruction ( int opcode ) {
this . lineAndOpcode = ( - 1 < < 8 ) | opcode ;
}
/ * *
@ -263,6 +370,12 @@ public class Instruction implements Opcodes{
poppush [ 1 ] = delta > > 3 ;
}
/ * *
* Gets a printable representation of the opcode with its
* parameters . This will not include the destination for jump
* instructions , since this information is not stored inside the
* instruction .
* /
public final String getDescription ( ) {
return toString ( ) ;
}
@ -276,6 +389,6 @@ public class Instruction implements Opcodes{
* \ 177 if opcode is illegal , or 8 * stack_push + stack_pop otherwise
* The string is created by scripts / createStackDelta . pl
* /
protected final static String stackDelta =
final static String stackDelta =
"\000\010\010\010\010\010\010\010\010\020\020\010\010\010\020\020\010\010\010\010\020\010\020\010\020\010\010\010\010\010\020\020\020\020\010\010\010\010\020\020\020\020\010\010\010\010\012\022\012\022\012\012\012\012\001\002\001\002\001\001\001\001\001\002\002\002\002\001\001\001\001\002\002\002\002\001\001\001\001\003\004\003\004\003\003\003\003\001\002\021\032\043\042\053\064\022\012\024\012\024\012\024\012\024\012\024\012\024\012\024\012\024\012\024\012\024\011\022\011\022\012\023\012\023\012\023\012\024\012\024\012\024\000\021\011\021\012\012\022\011\021\021\012\022\012\011\011\011\014\012\012\014\014\001\001\001\001\001\001\002\002\002\002\002\002\002\002\000\000\000\001\001\001\002\001\002\001\000\100\100\100\100\100\100\100\100\177\010\011\011\011\001\011\011\001\001\177\100\001\001\000\000" ;
}
hoenicke
25 years ago