IFLTLike
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package instructions
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 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.
The final pc of this instruction in the code array.
The map which maps all symbols to their final pcs.
Returns the location – Stack, Register or NoExpression – where the value computed by this instruction is stored.
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 a 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 CHECKCAST instruction is special in the sense that it just inspects the top-most value.
The index of the next instruction in the code array.
The index of the next instruction in the code array.
The index of the next instruction in the (sparse) code array.
The index of the next instruction in the (sparse) code array.
This is primarily a convenience method that delegates to the method
indexOfNextInstrution(PC,Boolean). However, given that this is also the
standard method called by clients, it is often meaningful to directly implement
this. In particular since most instructions cannot be modified by wide.
The index of the local (variable)/register that is read is returned.
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.
The index of the local (variable)/register that is written. This
method is only defined if writesLocal returns true.
Determines if this instruction is isomorphic to the given instruction.
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.
this.isIsomorphic(thisPC,thisPC) is always true
The number of padding bytes is generally calculated by (otherPC % 4) -
(thisPC %4) (=== "padding other" - "padding this")
and should be added to the branch offsets of this (XYZ)switch instruction
when the branch targets are compared to the other instructions branchoffsets.
// "padding b" - "padding a" // === (3 - (bPC % 4)) - (3 - (aPC % 4)) // === (aPC % 4) - (bPC %4)
The exceptions that may be thrown by the JVM at runtime if the execution of this instruction fails.
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 returned types always precisely describe the thrown exception; they are not upper bounds. All instructions – except of the InvocationInstructions and the ATHROW$ instruction – will always either succeed, throw a linkage time related exception or throw one of the specified exceptions.
The number of bytes (in the Code array) used by the instruction.
The number of bytes (in the Code array) used by the instruction.
The mnemonic of the instruction as defined by the JVM specification.
The mnemonic of the instruction as defined by the JVM specification.
The number of values that are popped from the operand stack.
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.
A function that returns the computational type category of the value on the operand stack with a given value index. E.g., The top value on the operand stack has index '0' and may occupy one (for category 1 values) or two stack slots (for category 2 values.)
In case of some of the StackManagementInstruction the number of popped values is
not fixed. In that case the number depends on the concrete layout of the
operand stack. E.g., the POP2 instruction may just pop one
categeory 2 value (of type long or double) or two category 1
values.
The number of values that are put onto the operand stack.
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.
A function that returns the computational type category of the value on the operand stack with a given value index. The top value on the operand stack has index '0' and may occupy one (for category 1 values) or two stack slots (for category 2 values.)
In case of some of the StackManagementInstruction this number is not fixed. In that case the number depends on the concrete layout of the operand stack. E.g., the DUP2 instruction may just duplicate one categeory 2 value (result is 1) (of type long or double) or two category 1 values (result is 2).
The opcode of the instruction as defined by the JVM specification.
The opcode of the instruction as defined by the JVM specification. The opcode is a value in the range [0..255].
The number of operand values popped from the operand stack.
The number of operand values popped from the operand stack.
The comparison operator (incl.
The comparison operator (incl. the constant) underlying the if instruction.
E.g., <, < 0 or != null.
Returns true if this instruction reads/uses a local variable.
Returns true if this instruction reads/uses a local variable.
The number of stack slots pushed or popped by this instruction.
The number of stack slots pushed or popped by this instruction.
Overall, each DUP instruction always pushes the same number of stack slots. Only the number of values that are processed may depend on the stack layout.
Returns a string representation of 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.
The program counter of this instruction. Used to resolve relative jump targets.
Returns true if this instruction writes/updates a local variable.
Returns true if this instruction writes/updates a local variable.
Branch if int comparison with zero succeeds; succeeds if and only if value < 0.