A simple, error-free stack machine that runs in C++ compile time.
Have fun changing Insts in main.cpp and run.
clang++ main.cpp -o main -std=c++11 -O3
Result of VM instructions is just constexpr int result;.
You can find the result in asm code:
clang++ main.cpp -S -std=c++11 -O3
everything is evaluated in C++ compile time, so that C++ type system comes to help. It assures that your VM instructions are correct or refuse to compile.
the following code would not compile:
PUSH 1
JMP 10
since 10 is out of bounds.
PUSH 1
JMP 0
an infinite loop! this would not gonna happen.
Running a piece of VM code costs zero time! the only bottleneck is your C++ compiler.
well, you can just use result in any part of your C++ code.
So it is a real VM, not a toddler's toy. (Although pretty much an undergrduate's toy.)