|Taylor Bockman ec7ddca7ec Create LICENSE||3 years ago|
|include||3 years ago|
|src||3 years ago|
|.gitignore||3 years ago|
|CMakeLists.txt||3 years ago|
|LICENSE||3 years ago|
|README.md||3 years ago|
uVM is simply an experiment in developing a working virtual machine with it's own bytecode.
I am taking any and all contributions! This is a fun project for me and I'd like to see other people throw their ideas into this.
git clonethe repository
NOTE: This is unimplemented - Looking for contributors
uvm [-v] [-h] [-d <stack_depth>] -f <your_file_of_bytecode>.uc
-v: Enable verbose logging mode
-h: Show usage
-f <file_name>.uc: Load the uvm bytecode file for processing
-d <stack_depth>: The maximum stack depth in words
CMake tests are used to confirm a handful of sample programs will run successfully in the VM
uVM is a stack machine. That is, it gets all of it's arguments from the stack, and returns the result of the computation back to the stack when it's done.
There are some exceptions to this. In particular the current version of uvm supports registers.
uVM possesses the standard issue instruction set you might expect in a simple VM:
|ipush X||0||Pushes integer X onto the stack|
|isave0||1||Takes the top of the stack and stores it in
|isave1||2||Takes the top of the stack and stores it in
|isave2||3||Takes the top of the stack and stores it in
|iload0||4||Puts the value in
|iload1||5||Puts the value in
|iload2||6||Puts the value in
|icmp||7||Compares the top two items on the stack together and returns a boolean result|
|iadd||8||Adds the top two integer arguments of the stack together|
|isub||9||Subtracts the top two integer arguments of the stack from each other|
|jmp BYTE||A||Unconditional jump to BYTE|
|jc BYTE||B||Jump to BYTE if the top of the stack is a 1|
|halt||C||Halts the VM|
|D||Prints the current top of the stack as an integer|
|imul||E||Multiples the top two integers on the stack|
|idiv||10||Takes the top two values on the stack and performs integer division on them|
|irem||11||Takes the integer remainder of the division of the top two integer values on the stack|
Additionally some registers exist to ease computation:
|t0||Temporary integer register 0|
|t1||Temporary integer register 1|
|t2||Temporary integer register 2|
|cf||Comparison flag register|
As I learn more about VM development this instruction set will likely become much more robust.
uVM borrows heavily from past work - so a CDECL convention modified to work with stack machines (result is store on the top of the stack instead of EAX) is used.