org.objectweb.asm.tree.analysis
Class SourceInterpreter

java.lang.Object
  extended by org.objectweb.asm.tree.analysis.SourceInterpreter
All Implemented Interfaces:
Opcodes, Interpreter

public class SourceInterpreter
extends Object
implements Opcodes, Interpreter

An Interpreter for SourceValue values.

Author:
Eric Bruneton

Field Summary
 
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_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, 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, 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, INVOKEDYNAMIC_OWNER, 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
 
Constructor Summary
SourceInterpreter()
           
 
Method Summary
 Value binaryOperation(AbstractInsnNode insn, Value value1, Value value2)
          Interprets a bytecode instruction with two arguments.
 Value copyOperation(AbstractInsnNode insn, Value value)
          Interprets a bytecode instruction that moves a value on the stack or to or from local variables.
 Value merge(Value v, Value w)
          Merges two values.
 Value naryOperation(AbstractInsnNode insn, List values)
          Interprets a bytecode instruction with a variable number of arguments.
 Value newOperation(AbstractInsnNode insn)
          Interprets a bytecode instruction without arguments.
 Value newValue(Type type)
          Creates a new value that represents the given type.
 void returnOperation(AbstractInsnNode insn, Value value, Value expected)
          Interprets a bytecode return instruction.
 Value ternaryOperation(AbstractInsnNode insn, Value value1, Value value2, Value value3)
          Interprets a bytecode instruction with three arguments.
 Value unaryOperation(AbstractInsnNode insn, Value value)
          Interprets a bytecode instruction with a single argument.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

SourceInterpreter

public SourceInterpreter()
Method Detail

newValue

public Value newValue(Type type)
Description copied from interface: Interpreter
Creates a new value that represents the given type. Called for method parameters (including this), exception handler variable and with null type for variables reserved by long and double types.

Specified by:
newValue in interface Interpreter
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.

newOperation

public Value newOperation(AbstractInsnNode insn)
Description copied from interface: 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 interface Interpreter
Parameters:
insn - the bytecode instruction to be interpreted.
Returns:
the result of the interpretation of the given instruction.

copyOperation

public Value copyOperation(AbstractInsnNode insn,
                           Value value)
Description copied from interface: 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 interface Interpreter
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.

unaryOperation

public Value unaryOperation(AbstractInsnNode insn,
                            Value value)
Description copied from interface: 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 interface Interpreter
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.

binaryOperation

public Value binaryOperation(AbstractInsnNode insn,
                             Value value1,
                             Value value2)
Description copied from interface: 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 interface Interpreter
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.

ternaryOperation

public Value ternaryOperation(AbstractInsnNode insn,
                              Value value1,
                              Value value2,
                              Value value3)
Description copied from interface: 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 interface Interpreter
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.

naryOperation

public Value naryOperation(AbstractInsnNode insn,
                           List values)
Description copied from interface: Interpreter
Interprets a bytecode instruction with a variable number of arguments. This method is called for the following opcodes: INVOKEVIRTUAL, INVOKESPECIAL, INVOKESTATIC, INVOKEINTERFACE, MULTIANEWARRAY

Specified by:
naryOperation in interface Interpreter
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.

returnOperation

public void returnOperation(AbstractInsnNode insn,
                            Value value,
                            Value expected)
Description copied from interface: Interpreter
Interprets a bytecode return instruction. This method is called for the following opcodes: IRETURN, LRETURN, FRETURN, DRETURN, ARETURN

Specified by:
returnOperation in interface Interpreter
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.

merge

public Value merge(Value v,
                   Value w)
Description copied from interface: 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 interface Interpreter
Parameters:
v - a value.
w - another value.
Returns:
the merged value. If the merged value is equal to v, this method must return v.