Package serp.bytecode
Class CmpInstruction
java.lang.Object
serp.bytecode.CodeEntry
serp.bytecode.Instruction
serp.bytecode.TypedInstruction
serp.bytecode.CmpInstruction
- All Implemented Interfaces:
BCEntity
,VisitAcceptor
An instruction comparing two stack values. Examples include
lcmp, fcmpl
, etc.-
Field Summary
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionvoid
acceptVisit
(BCVisitor visit) Accept a visit from aBCVisitor
, calling the appropriate methods to notify the visitor that it has entered this entity, and to provide it with the proper callbacks for each sub-entity owned by this one.int
Return the logical number of stack positions changed by this instruction.int
Return the number that will be placed on the stack if this instruction is of type float or double and one of the operands is NaN.int
Return the number of stack positions this instruction pushes or pops during its execution.Return the type name for this instruction.setNaNValue
(int nan) Set the number that will be placed on the stack if this instruction is of type float or double and one of the operands is NaN.Set the type of this instruction.Methods inherited from class serp.bytecode.TypedInstruction
getType, getTypeBC, mapType, setType, setType
Methods inherited from class serp.bytecode.Instruction
equalsInstruction, getByteIndex, getClassLoader, getCode, getLength, getLineNumber, getName, getOpcode, getPool, getProject, invalidate, invalidateByteIndexes, isValid, read, read, setOpcode, write
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Field Details
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_mappings
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Constructor Details
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Method Details
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getLogicalStackChange
public int getLogicalStackChange()Description copied from class:Instruction
Return the logical number of stack positions changed by this instruction. In other words, ignore weirdness with longs and doubles taking two stack positions.- Overrides:
getLogicalStackChange
in classInstruction
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getStackChange
public int getStackChange()Description copied from class:Instruction
Return the number of stack positions this instruction pushes or pops during its execution.- Overrides:
getStackChange
in classInstruction
- Returns:
- 0 if the stack is not affected by this instruction, a positive number if it pushes onto the stack, and a negative number if it pops from the stack
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getTypeName
Description copied from class:TypedInstruction
Return the type name for this instruction. If the type has not been set, this method will return null.- Specified by:
getTypeName
in classTypedInstruction
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setType
Description copied from class:TypedInstruction
Set the type of this instruction. Types that have no direct support will be converted accordingly.- Specified by:
setType
in classTypedInstruction
- Returns:
- this instruction, for method chaining
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getNaNValue
public int getNaNValue()Return the number that will be placed on the stack if this instruction is of type float or double and one of the operands is NaN. For FCMPG or DCMPG, this value will be 1; for FCMPL or DCMPL this value will be -1. For LCMP or if the type is unset, this value will be 0. -
setNaNValue
Set the number that will be placed on the stack if this instruction is of type float or double and one of the operands is NaN. For FCMPG or DCMPG, this value should be 1; for FCMPL or DCMPL this value should be -1. For LCMP, this value should be 0.- Returns:
- this instruction, for method chaining
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acceptVisit
Description copied from interface:VisitAcceptor
Accept a visit from aBCVisitor
, calling the appropriate methods to notify the visitor that it has entered this entity, and to provide it with the proper callbacks for each sub-entity owned by this one.- Specified by:
acceptVisit
in interfaceVisitAcceptor
- Overrides:
acceptVisit
in classInstruction
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