Problem Statement

A virtual machine implements a computer in software. Write a virtual machine interpreter. This interpreter should be able to run virtual assembly language programs created via the task. This is a byte-coded, 32-bit word stack based virtual machine. The program should read input from a file and/or stdin, and write output to a file and/or stdout. Input format: Given the following program: The output from the Code generator is a virtual assembly code program: The first line of the input specifies the datasize required and the number of constant strings, in the order that they are reference via the code. The data can be stored in a separate array, or the data can be stored at the beginning of the stack. Data is addressed starting at 0. If there are 3 variables, the 3rd one if referenced at address 2. If there are one or more constant strings, they come next. The code refers to these strings by their index. The index starts at 0. So if there are 3 strings, and the code wants to reference the 3rd string, 2 will be used. Next comes the actual virtual assembly code. The first number is the code address of that instruction. After that is the instruction mnemonic, followed by optional operands, depending on the instruction. Registers: sp: pc: Data: Instructions: Each instruction is one byte. The following instructions also have a 32-bit integer operand: where index is an index into the data array. where index is an index into the data array. where value is a 32-bit integer that will be pushed onto the stack. where (n) is a 32-bit integer specifying the distance between the current location and the desired location. addr is an unsigned value of the actual code address. where (n) is a 32-bit integer specifying the distance between the current location and the desired location. addr is an unsigned value of the actual code address. The following instructions do not have an operand. They perform their operation directly against the stack: For the following instructions, the operation is performed against the top two entries in the stack: For the following instructions, the operation is performed against the top entry in the stack: Print the word at stack top as a character. Print the word at stack top as an integer. Stack top points to an index into the string pool. Print that entry. Unconditional stop. Your solution should pass all the test cases above and the additional tests found Here. The C and Python versions can be considered reference implementations.

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