Package org.objectweb.asm.tree.analysis
Class BasicInterpreter
- java.lang.Object
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- org.objectweb.asm.tree.analysis.Interpreter<BasicValue>
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- org.objectweb.asm.tree.analysis.BasicInterpreter
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- All Implemented Interfaces:
Opcodes
- Direct Known Subclasses:
BasicVerifier
public class BasicInterpreter extends Interpreter<BasicValue> implements Opcodes
AnInterpreter
forBasicValue
values.- Author:
- Eric Bruneton, Bing Ran
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Field Summary
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Fields inherited from class org.objectweb.asm.tree.analysis.Interpreter
api
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Fields inherited from interface org.objectweb.asm.Opcodes
AALOAD, AASTORE, ACC_ABSTRACT, ACC_ANNOTATION, ACC_BRIDGE, ACC_DEPRECATED, ACC_ENUM, ACC_FINAL, ACC_INTERFACE, ACC_MANDATED, ACC_NATIVE, ACC_PRIVATE, ACC_PROTECTED, ACC_PUBLIC, ACC_STATIC, ACC_STRICT, ACC_SUPER, ACC_SYNCHRONIZED, ACC_SYNTHETIC, ACC_TRANSIENT, ACC_VARARGS, ACC_VOLATILE, ACONST_NULL, ALOAD, ANEWARRAY, ARETURN, ARRAYLENGTH, ASM4, ASM5, ASTORE, ATHROW, BALOAD, BASTORE, BIPUSH, CALOAD, CASTORE, CHECKCAST, D2F, D2I, D2L, DADD, DALOAD, DASTORE, DCMPG, DCMPL, DCONST_0, DCONST_1, DDIV, DLOAD, DMUL, DNEG, DOUBLE, DREM, DRETURN, DSTORE, DSUB, DUP, DUP_X1, DUP_X2, DUP2, DUP2_X1, DUP2_X2, F_APPEND, F_CHOP, F_FULL, F_NEW, F_SAME, F_SAME1, F2D, F2I, F2L, FADD, FALOAD, FASTORE, FCMPG, FCMPL, FCONST_0, FCONST_1, FCONST_2, FDIV, FLOAD, FLOAT, FMUL, FNEG, FREM, FRETURN, FSTORE, FSUB, GETFIELD, GETSTATIC, GOTO, H_GETFIELD, H_GETSTATIC, H_INVOKEINTERFACE, H_INVOKESPECIAL, H_INVOKESTATIC, H_INVOKEVIRTUAL, H_NEWINVOKESPECIAL, H_PUTFIELD, H_PUTSTATIC, I2B, I2C, I2D, I2F, I2L, I2S, IADD, IALOAD, IAND, IASTORE, ICONST_0, ICONST_1, ICONST_2, ICONST_3, ICONST_4, ICONST_5, ICONST_M1, IDIV, IF_ACMPEQ, IF_ACMPNE, IF_ICMPEQ, IF_ICMPGE, IF_ICMPGT, IF_ICMPLE, IF_ICMPLT, IF_ICMPNE, IFEQ, IFGE, IFGT, IFLE, IFLT, IFNE, IFNONNULL, IFNULL, IINC, ILOAD, IMUL, INEG, INSTANCEOF, INTEGER, INVOKEDYNAMIC, INVOKEINTERFACE, INVOKESPECIAL, INVOKESTATIC, INVOKEVIRTUAL, IOR, IREM, IRETURN, ISHL, ISHR, ISTORE, ISUB, IUSHR, IXOR, JSR, L2D, L2F, L2I, LADD, LALOAD, LAND, LASTORE, LCMP, LCONST_0, LCONST_1, LDC, LDIV, LLOAD, LMUL, LNEG, LONG, LOOKUPSWITCH, LOR, LREM, LRETURN, LSHL, LSHR, LSTORE, LSUB, LUSHR, LXOR, MONITORENTER, MONITOREXIT, MULTIANEWARRAY, NEW, NEWARRAY, NOP, NULL, POP, POP2, PUTFIELD, PUTSTATIC, RET, RETURN, SALOAD, SASTORE, SIPUSH, SWAP, T_BOOLEAN, T_BYTE, T_CHAR, T_DOUBLE, T_FLOAT, T_INT, T_LONG, T_SHORT, TABLESWITCH, TOP, UNINITIALIZED_THIS, V1_1, V1_2, V1_3, V1_4, V1_5, V1_6, V1_7, V1_8
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Constructor Summary
Constructors Modifier Constructor Description BasicInterpreter()
protected
BasicInterpreter(int api)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description BasicValue
binaryOperation(AbstractInsnNode insn, BasicValue value1, BasicValue value2)
Interprets a bytecode instruction with two arguments.BasicValue
copyOperation(AbstractInsnNode insn, BasicValue value)
Interprets a bytecode instruction that moves a value on the stack or to or from local variables.BasicValue
merge(BasicValue v, BasicValue w)
Merges two values.BasicValue
naryOperation(AbstractInsnNode insn, List<? extends BasicValue> values)
Interprets a bytecode instruction with a variable number of arguments.BasicValue
newOperation(AbstractInsnNode insn)
Interprets a bytecode instruction without arguments.BasicValue
newValue(Type type)
Creates a new value that represents the given type.void
returnOperation(AbstractInsnNode insn, BasicValue value, BasicValue expected)
Interprets a bytecode return instruction.BasicValue
ternaryOperation(AbstractInsnNode insn, BasicValue value1, BasicValue value2, BasicValue value3)
Interprets a bytecode instruction with three arguments.BasicValue
unaryOperation(AbstractInsnNode insn, BasicValue value)
Interprets a bytecode instruction with a single argument.
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Method Detail
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newValue
public BasicValue newValue(Type type)
Description copied from class:Interpreter
Creates a new value that represents the given type. Called for method parameters (includingthis
), exception handler variable and withnull
type for variables reserved by long and double types.- Specified by:
newValue
in classInterpreter<BasicValue>
- Parameters:
type
- a primitive or reference type, or null to represent an uninitialized value.- Returns:
- a value that represents the given type. The size of the returned value must be equal to the size of the given type.
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newOperation
public BasicValue newOperation(AbstractInsnNode insn) throws AnalyzerException
Description copied from class:Interpreter
Interprets a bytecode instruction without arguments. This method is called for the following opcodes: ACONST_NULL, ICONST_M1, ICONST_0, ICONST_1, ICONST_2, ICONST_3, ICONST_4, ICONST_5, LCONST_0, LCONST_1, FCONST_0, FCONST_1, FCONST_2, DCONST_0, DCONST_1, BIPUSH, SIPUSH, LDC, JSR, GETSTATIC, NEW- Specified by:
newOperation
in classInterpreter<BasicValue>
- Parameters:
insn
- the bytecode instruction to be interpreted.- Returns:
- the result of the interpretation of the given instruction.
- Throws:
AnalyzerException
- if an error occured during the interpretation.
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copyOperation
public BasicValue copyOperation(AbstractInsnNode insn, BasicValue value) throws AnalyzerException
Description copied from class:Interpreter
Interprets a bytecode instruction that moves a value on the stack or to or from local variables. This method is called for the following opcodes: ILOAD, LLOAD, FLOAD, DLOAD, ALOAD, ISTORE, LSTORE, FSTORE, DSTORE, ASTORE, DUP, DUP_X1, DUP_X2, DUP2, DUP2_X1, DUP2_X2, SWAP- Specified by:
copyOperation
in classInterpreter<BasicValue>
- Parameters:
insn
- the bytecode instruction to be interpreted.value
- the value that must be moved by the instruction.- Returns:
- the result of the interpretation of the given instruction. The returned value must be equal to the given value.
- Throws:
AnalyzerException
- if an error occured during the interpretation.
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unaryOperation
public BasicValue unaryOperation(AbstractInsnNode insn, BasicValue value) throws AnalyzerException
Description copied from class:Interpreter
Interprets a bytecode instruction with a single argument. This method is called for the following opcodes: INEG, LNEG, FNEG, DNEG, IINC, I2L, I2F, I2D, L2I, L2F, L2D, F2I, F2L, F2D, D2I, D2L, D2F, I2B, I2C, I2S, IFEQ, IFNE, IFLT, IFGE, IFGT, IFLE, TABLESWITCH, LOOKUPSWITCH, IRETURN, LRETURN, FRETURN, DRETURN, ARETURN, PUTSTATIC, GETFIELD, NEWARRAY, ANEWARRAY, ARRAYLENGTH, ATHROW, CHECKCAST, INSTANCEOF, MONITORENTER, MONITOREXIT, IFNULL, IFNONNULL- Specified by:
unaryOperation
in classInterpreter<BasicValue>
- Parameters:
insn
- the bytecode instruction to be interpreted.value
- the argument of the instruction to be interpreted.- Returns:
- the result of the interpretation of the given instruction.
- Throws:
AnalyzerException
- if an error occured during the interpretation.
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binaryOperation
public BasicValue binaryOperation(AbstractInsnNode insn, BasicValue value1, BasicValue value2) throws AnalyzerException
Description copied from class:Interpreter
Interprets a bytecode instruction with two arguments. This method is called for the following opcodes: IALOAD, LALOAD, FALOAD, DALOAD, AALOAD, BALOAD, CALOAD, SALOAD, IADD, LADD, FADD, DADD, ISUB, LSUB, FSUB, DSUB, IMUL, LMUL, FMUL, DMUL, IDIV, LDIV, FDIV, DDIV, IREM, LREM, FREM, DREM, ISHL, LSHL, ISHR, LSHR, IUSHR, LUSHR, IAND, LAND, IOR, LOR, IXOR, LXOR, LCMP, FCMPL, FCMPG, DCMPL, DCMPG, IF_ICMPEQ, IF_ICMPNE, IF_ICMPLT, IF_ICMPGE, IF_ICMPGT, IF_ICMPLE, IF_ACMPEQ, IF_ACMPNE, PUTFIELD- Specified by:
binaryOperation
in classInterpreter<BasicValue>
- Parameters:
insn
- the bytecode instruction to be interpreted.value1
- the first argument of the instruction to be interpreted.value2
- the second argument of the instruction to be interpreted.- Returns:
- the result of the interpretation of the given instruction.
- Throws:
AnalyzerException
- if an error occured during the interpretation.
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ternaryOperation
public BasicValue ternaryOperation(AbstractInsnNode insn, BasicValue value1, BasicValue value2, BasicValue value3) throws AnalyzerException
Description copied from class:Interpreter
Interprets a bytecode instruction with three arguments. This method is called for the following opcodes: IASTORE, LASTORE, FASTORE, DASTORE, AASTORE, BASTORE, CASTORE, SASTORE- Specified by:
ternaryOperation
in classInterpreter<BasicValue>
- Parameters:
insn
- the bytecode instruction to be interpreted.value1
- the first argument of the instruction to be interpreted.value2
- the second argument of the instruction to be interpreted.value3
- the third argument of the instruction to be interpreted.- Returns:
- the result of the interpretation of the given instruction.
- Throws:
AnalyzerException
- if an error occured during the interpretation.
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naryOperation
public BasicValue naryOperation(AbstractInsnNode insn, List<? extends BasicValue> values) throws AnalyzerException
Description copied from class:Interpreter
Interprets a bytecode instruction with a variable number of arguments. This method is called for the following opcodes: INVOKEVIRTUAL, INVOKESPECIAL, INVOKESTATIC, INVOKEINTERFACE, MULTIANEWARRAY and INVOKEDYNAMIC- Specified by:
naryOperation
in classInterpreter<BasicValue>
- Parameters:
insn
- the bytecode instruction to be interpreted.values
- the arguments of the instruction to be interpreted.- Returns:
- the result of the interpretation of the given instruction.
- Throws:
AnalyzerException
- if an error occured during the interpretation.
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returnOperation
public void returnOperation(AbstractInsnNode insn, BasicValue value, BasicValue expected) throws AnalyzerException
Description copied from class:Interpreter
Interprets a bytecode return instruction. This method is called for the following opcodes: IRETURN, LRETURN, FRETURN, DRETURN, ARETURN- Specified by:
returnOperation
in classInterpreter<BasicValue>
- Parameters:
insn
- the bytecode instruction to be interpreted.value
- the argument of the instruction to be interpreted.expected
- the expected return type of the analyzed method.- Throws:
AnalyzerException
- if an error occured during the interpretation.
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merge
public BasicValue merge(BasicValue v, BasicValue w)
Description copied from class:Interpreter
Merges two values. The merge operation must return a value that represents both values (for instance, if the two values are two types, the merged value must be a common super type of the two types. If the two values are integer intervals, the merged value must be an interval that contains the previous ones. Likewise for other types of values).- Specified by:
merge
in classInterpreter<BasicValue>
- Parameters:
v
- a value.w
- another value.- Returns:
- the merged value. If the merged value is equal to v, this method must return v.
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