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## mars.mips.instructions.syscalls
Interface Syscall

All Known Implementing Classes:
  AbstractSyscall, SyscallClose, SyscallConfirmDialog, SyscallExit, SyscallExit2, SyscallInputDialogDouble, SyscallInputDialogFloat, SyscallInputDialogInt, SyscallInputDialogString, SyscallMessageDialog, SyscallMessageDialogDouble, SyscallMessageDialogFloat, SyscallMessageDialogInt, SyscallMessageDialogString, SyscallMidiOut, SyscallMidiOutSync, SyscallOpen, SyscallPrintChar, SyscallPrintDouble, SyscallPrintFloat, SyscallPrintInt, SyscallPrintIntBinary, SyscallPrintIntHex, SyscallPrintIntUnsigned, SyscallPrintString, SyscallRandDouble, SyscallRandFloat, SyscallRandInt, SyscallRandIntRange, SyscallRandSeed, SyscallRead, SyscallReadChar, SyscallReadDouble, SyscallReadFloat, SyscallReadInt, SyscallReadString, SyscallSbrk, SyscallSleep, SyscallTime, SyscallWrite

    public interface Syscall

Interface for any MIPS syscall system service. A qualifying service must be a class in the mars.mips.instructions.syscalls package that implements the Syscall interface, must be compiled into a .class file, and its .class file must be in the same folder as Syscall.class. Mars will detect a qualifying syscall upon startup, create an instance using its no-argument constructor and add it to its syscall list. When its service is invoked at runtime ("syscall" instruction with its service number stored in register $v0), its simulate() method will be invoked.

Method Summary
`String` | `getName()` Return a name you have chosen for this syscall.
`int` | `getNumber()` Return the assigned service number.
`void` | `setNumber(int num)` Set the service number.
`void` | `simulate(ProgramStatement statement)` Performs syscall function.

Method Detail

### getName

    String getName()

  Return a name you have chosen for this syscall. This can be used by a MARS user to refer to the service when choosing to override its default service number in the configuration file.

  Returns:
    service name as a string

### setNumber

    void setNumber(int num)

  Set the service number. This is provided to allow MARS implementer or user to override the default service number.

  Parameters:
    `num` - specified service number to override the default.

### getNumber

    int getNumber()

  Return the assigned service number. This is the number the MIPS programmer must store into $v0 before issuing the SYSCALL instruction.

  Returns:
    assigned service number

### simulate

    void simulate(ProgramStatement statement)
                  throws ProcessingException

  Performs syscall function. It will be invoked when the service is invoked at simulation time. Service is identified by value stored in $v0.

  Parameters:
    `statement` - ProgramStatement for this syscall statement.
  Throws:
    `ProcessingException`

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