Class BasicInterpreter
- All Implemented Interfaces:
Opcodes
- Direct Known Subclasses:
BasicVerifier
Interpreter
for BasicValue
values.-
Field Summary
Fields inherited from class org.objectweb.asm.tree.analysis.Interpreter
api
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_MODULE, ACC_NATIVE, ACC_OPEN, ACC_PRIVATE, ACC_PROTECTED, ACC_PUBLIC, ACC_RECORD, ACC_STATIC, ACC_STATIC_PHASE, ACC_STRICT, ACC_SUPER, ACC_SYNCHRONIZED, ACC_SYNTHETIC, ACC_TRANSIENT, ACC_TRANSITIVE, ACC_VARARGS, ACC_VOLATILE, ACONST_NULL, ALOAD, ANEWARRAY, ARETURN, ARRAYLENGTH, ASM10_EXPERIMENTAL, ASM4, ASM5, ASM6, ASM7, ASM8, ASM9, 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, SOURCE_DEPRECATED, SOURCE_MASK, SWAP, T_BOOLEAN, T_BYTE, T_CHAR, T_DOUBLE, T_FLOAT, T_INT, T_LONG, T_SHORT, TABLESWITCH, TOP, UNINITIALIZED_THIS, V_PREVIEW, V1_1, V1_2, V1_3, V1_4, V1_5, V1_6, V1_7, V1_8, V10, V11, V12, V13, V14, V15, V16, V17, V18, V19, V20, V21, V22, V23, V9
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Constructor Summary
ModifierConstructorDescriptionConstructs a newBasicInterpreter
for the latest ASM API version.protected
BasicInterpreter
(int api) Constructs a newBasicInterpreter
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Method Summary
Modifier and TypeMethodDescriptionbinaryOperation
(AbstractInsnNode insn, BasicValue value1, BasicValue value2) Interprets a bytecode instruction with two arguments.copyOperation
(AbstractInsnNode insn, BasicValue value) Interprets a bytecode instruction that moves a value on the stack or to or from local variables.merge
(BasicValue value1, BasicValue value2) Merges two values.naryOperation
(AbstractInsnNode insn, List<? extends BasicValue> values) Interprets a bytecode instruction with a variable number of arguments.newOperation
(AbstractInsnNode insn) Interprets a bytecode instruction without arguments.Creates a new value that represents the given type.void
returnOperation
(AbstractInsnNode insn, BasicValue value, BasicValue expected) Interprets a bytecode return instruction.ternaryOperation
(AbstractInsnNode insn, BasicValue value1, BasicValue value2, BasicValue value3) Interprets a bytecode instruction with three arguments.unaryOperation
(AbstractInsnNode insn, BasicValue value) Interprets a bytecode instruction with a single argument.Methods inherited from class org.objectweb.asm.tree.analysis.Interpreter
newEmptyValue, newExceptionValue, newParameterValue, newReturnTypeValue
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Field Details
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NULL_TYPE
Special type used for the null literal. This is an object reference type with descriptor 'Lnull;'.
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Constructor Details
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BasicInterpreter
public BasicInterpreter()Constructs a newBasicInterpreter
for the latest ASM API version. Subclasses must not use this constructor. Instead, they must use theBasicInterpreter(int)
version. -
BasicInterpreter
protected BasicInterpreter(int api) Constructs a newBasicInterpreter
.- Parameters:
api
- the ASM API version supported by this interpreter. Must be one of theASM
x values inOpcodes
.
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Method Details
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newValue
Description copied from class:Interpreter
Creates a new value that represents the given type.Called for method parameters (including
this
), exception handler variable and withnull
type for variables reserved by long and double types.An interpreter may choose to implement one or more of
Interpreter.newReturnTypeValue(Type)
,Interpreter.newParameterValue(boolean, int, Type)
,Interpreter.newEmptyValue(int)
,Interpreter.newExceptionValue(TryCatchBlockNode, Frame, Type)
to distinguish different types of new value.- 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
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 occurred during the interpretation.
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copyOperation
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 occurred during the interpretation.
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unaryOperation
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 occurred 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 occurred 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 occurred 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 occurred 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 occurred during the interpretation.
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merge
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:
value1
- a value.value2
- another value.- Returns:
- the merged value. If the merged value is equal to
value1
, this method must returnvalue1
.
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