Package org.apache.bcel.generic
Interface InstructionConstants
- All Known Implementing Classes:
InstructionFactory
,PUSH
public interface InstructionConstants
This interface contains shareable instruction objects.
In order to save memory you can use some instructions multiply,
since they have an immutable state and are directly derived from
Instruction. I.e. they have no instance fields that could be
changed. Since some of these instructions like ICONST_0 occur
very frequently this can save a lot of time and space. This
feature is an adaptation of the FlyWeight design pattern, we
just use an array instead of a factory.
The Instructions can also accessed directly under their names, so
it's possible to write il.append(Instruction.ICONST_0);
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Nested Class Summary
Nested Classes -
Field Summary
FieldsModifier and TypeFieldDescriptionstatic final ArrayInstruction
static final ArrayInstruction
static final Instruction
static final LocalVariableInstruction
static final LocalVariableInstruction
static final LocalVariableInstruction
static final ReturnInstruction
static final Instruction
static final LocalVariableInstruction
static final LocalVariableInstruction
static final LocalVariableInstruction
static final Instruction
static final ArrayInstruction
static final ArrayInstruction
static final InstructionConstants.Clinit
Interfaces may have no static initializers, so we simulate this with an inner class.static final ArrayInstruction
static final ArrayInstruction
static final ConversionInstruction
static final ConversionInstruction
static final ConversionInstruction
static final ArithmeticInstruction
static final ArrayInstruction
static final ArrayInstruction
static final Instruction
static final Instruction
static final Instruction
static final Instruction
static final ArithmeticInstruction
static final ArithmeticInstruction
static final ArithmeticInstruction
static final ArithmeticInstruction
static final ReturnInstruction
static final ArithmeticInstruction
static final StackInstruction
static final StackInstruction
static final StackInstruction
static final StackInstruction
static final StackInstruction
static final StackInstruction
static final ConversionInstruction
static final ConversionInstruction
static final ConversionInstruction
static final ArithmeticInstruction
static final ArrayInstruction
static final ArrayInstruction
static final Instruction
static final Instruction
static final Instruction
static final Instruction
static final Instruction
static final ArithmeticInstruction
static final ArithmeticInstruction
static final ArithmeticInstruction
static final ArithmeticInstruction
static final ReturnInstruction
static final ArithmeticInstruction
static final ConversionInstruction
static final ConversionInstruction
static final ConversionInstruction
static final ConversionInstruction
static final ConversionInstruction
static final ConversionInstruction
static final ArithmeticInstruction
static final ArrayInstruction
static final ArithmeticInstruction
static final ArrayInstruction
static final Instruction
static final Instruction
static final Instruction
static final Instruction
static final Instruction
static final Instruction
static final Instruction
static final ArithmeticInstruction
static final LocalVariableInstruction
static final LocalVariableInstruction
static final LocalVariableInstruction
static final ArithmeticInstruction
static final ArithmeticInstruction
static final Instruction[]
Get object via its opcode, for immutable instructions like branch instructions entries are set to null.static final ArithmeticInstruction
static final ArithmeticInstruction
static final ReturnInstruction
static final ArithmeticInstruction
static final ArithmeticInstruction
static final LocalVariableInstruction
static final LocalVariableInstruction
static final LocalVariableInstruction
static final ArithmeticInstruction
static final ArithmeticInstruction
static final ArithmeticInstruction
static final ConversionInstruction
static final ConversionInstruction
static final ConversionInstruction
static final ArithmeticInstruction
static final ArrayInstruction
static final ArithmeticInstruction
static final ArrayInstruction
static final Instruction
static final Instruction
static final Instruction
static final ArithmeticInstruction
static final ArithmeticInstruction
static final ArithmeticInstruction
static final ArithmeticInstruction
static final ArithmeticInstruction
static final ReturnInstruction
static final ArithmeticInstruction
static final ArithmeticInstruction
static final ArithmeticInstruction
static final ArithmeticInstruction
static final ArithmeticInstruction
static final Instruction
static final Instruction
static final Instruction
Predefined instruction objectsstatic final StackInstruction
static final StackInstruction
static final ReturnInstruction
static final ArrayInstruction
static final ArrayInstruction
static final StackInstruction
static final LocalVariableInstruction
You can use these constants in multiple places safely, if you can guarantee that you will never alter their internal values, e.g.
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Field Details
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NOP
Predefined instruction objects -
ACONST_NULL
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ICONST_M1
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ICONST_0
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ICONST_1
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ICONST_2
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ICONST_3
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ICONST_4
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ICONST_5
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LCONST_0
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LCONST_1
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FCONST_0
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FCONST_1
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FCONST_2
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DCONST_0
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DCONST_1
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IALOAD
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LALOAD
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FALOAD
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DALOAD
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AALOAD
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BALOAD
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CALOAD
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SALOAD
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IASTORE
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LASTORE
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FASTORE
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DASTORE
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AASTORE
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BASTORE
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CASTORE
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SASTORE
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POP
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POP2
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DUP
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DUP_X1
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DUP_X2
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DUP2
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DUP2_X1
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DUP2_X2
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SWAP
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IADD
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LADD
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FADD
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DADD
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ISUB
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LSUB
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FSUB
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DSUB
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IMUL
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LMUL
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FMUL
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DMUL
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IDIV
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LDIV
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FDIV
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DDIV
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IREM
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LREM
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FREM
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DREM
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INEG
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LNEG
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FNEG
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DNEG
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ISHL
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LSHL
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ISHR
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LSHR
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IUSHR
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LUSHR
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IAND
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LAND
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IOR
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LOR
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IXOR
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LXOR
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I2L
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I2F
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I2D
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L2I
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L2F
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L2D
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F2I
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F2L
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F2D
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D2I
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D2L
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D2F
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I2B
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I2C
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I2S
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LCMP
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FCMPL
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FCMPG
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DCMPL
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DCMPG
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IRETURN
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LRETURN
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FRETURN
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DRETURN
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ARETURN
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RETURN
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ARRAYLENGTH
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ATHROW
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MONITORENTER
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MONITOREXIT
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THIS
You can use these constants in multiple places safely, if you can guarantee that you will never alter their internal values, e.g. call setIndex(). -
ALOAD_0
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ALOAD_1
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ALOAD_2
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ILOAD_0
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ILOAD_1
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ILOAD_2
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ASTORE_0
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ASTORE_1
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ASTORE_2
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ISTORE_0
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ISTORE_1
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ISTORE_2
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INSTRUCTIONS
Get object via its opcode, for immutable instructions like branch instructions entries are set to null. -
bla
Interfaces may have no static initializers, so we simulate this with an inner class.
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