Validates the branchoffset and returns it or throws an exception!

Returns the number of registers required to store the method's arguments including (if required) the self reference "this".

Returns the location – Stack, Register or NoExpression – where the value computed by this instruction is stored. In this case an instruction is only considered to be an expression if it puts a value on the stack or in a register that is the result of some kind of computation; i.e., just copying, duplicating or moving a value between the stack and the registers is not considered to be an expression.

The index of the next instruction in the (sparse) code array.

The index of the next instruction in the code array.

The index of the local (variable)/register that is read is returned. This method is only defined if readsLocal returns true.

The index of the local (variable)/register that is written. This method is only defined if writesLocal returns true.

Returns true if this method takes an implicit parameter "this".

Determines if this instruction is isomorphic to the given instruction.

Two instructions are isomporphic if they access the same operand and register values and if the instructions have the same bytecode representation, except of (A) (potential) padding bytes and (B) the branch offset of JSR(_W) instructions. In the first case the branch offsets are corrected by the number of padding bytes and in the second case the absolute addresses are compared (i.e., whether both instructions call the same subroutine).

For example, an aload_0 instruction is only isomorphic to another aload_0 instruction and is not isomorphic to an aload(0) instruction – though the runtime effect is the same. However, a LOOKUPSWITCH (TABLESWITCH) instruction is considered isomorphic to another respective instruction if the only difference is the number of padding bytes. Furthermore, two JSR(_W) instructions are isomorphic if and only if they jump to the same subroutine.

Returns true if the called method is an instance method and virtual method call resolution has to take place. I.e., if the underlying instruction is an invokevirtual or an invokeinterface instruction.

The exceptions that may be thrown by the JVM at runtime if the execution of this instruction fails. I.e., these are neither exceptions that are explicitly created and then thrown by user code nor errors that may arise due to an invalid code base (in particular LinkageErrors). However, OutOfMemoryErrors are possible.

The number of bytes (in the Code array) used by the instruction.

Returns true if the evaluation of the instruction may lead to some runtime exception. For example, in case of INVOKESTATIC jvmExceptions will return an empty list. However, in general the called method may throw an arbitrary exception.

Errors (such as LinkageError) related to invalid projects are not considered.

The method descriptor of the called method.

The mnemonic of the instruction as defined by the JVM specification.

The simple name of the called method.

Given that we have – without any sophisticated analysis – no idea which exceptions may be thrown by the called method, we make the safe assumption that any handler is a potential successor!

The result may contain duplicates iff multiple different exceptions are handled by the same handler. E.g., as generated in case of "Java's multicatch instruction":

try {} catch(IOException | NullPointerException ex) {...}

The number of values that are popped from the operand stack. Here, long and double values are also counted as one value though they use two stack slots. E.g., IADD (integer add) and LADD (long add) both pop two values and push one value.

The number of values that are put onto the operand stack. Here, long and double values are also counted as one value though they use two stack slots. E.g., IADD (integer add) and LADD (long add) both pop two values and push one value.

The opcode of the instruction as defined by the JVM specification. The opcode is a value in the range [0..255].

Returns true if this instruction reads/uses a local variable.

If this instruction uses Symbols to mark jump targets then the targets are replaced by the branchoffsets and an Instruction is returned. If this instruction already has concrete branchoffsets nothing special will happen.

If this instruction already has concrete jump targets nothing special will happen.

Checks for structural equality of two instructions.

The number of stack slots pushed or popped by this instruction.

Returns a string representation of this instruction. If this instruction is a (conditional) jump instruction, then the PCs of the target instructions are given absolute address.

Returns true if this instruction writes/updates a local variable.