"WIC" stands for Wren Intermediate Code, which is an intermediate language for the Wren teaching language. This is a small "virtual machine" that runs that intermediate language.
To use, just run ./wici <code.wic>
WIC is a very simple, stack-based intermediate language. The only types supported are signed integers and Boolean values (which implemented as integers).
The halt opcode stops the machine.
Labels are defined in the form L1 label (Where 1 can be replaced
with any number).
Jump statements are in the form j L1, where L1 can be any label. The
two forms of the jump instruction are:
j- Jump unconditionallyjf- Jump if value on the top of the stack is false (0). This pops that value off the top of the stack.
The nop instruction does nothing.
Test statements pop the a value off the top of the stack and compare it with zero, pushing either 1 (true) or 0 (false) back on to the stack. The six test instructions are:
tsteq- equalststne- not equalststlt- less thantstle- less than or equaltstgt- greater thantstge- greater than or equal
The available mathematical instructions are add, sub, mul,
div, and mod. They first pop the right operand off the stack, then
pop the left operand, perform the operation, and finally push the
result back on the stack.
The logical and and or instructions work the same way.
The logical not instruction is similar, except it only pops a single
value off the stack.
The push instruction is of the form push A where A is a variable
name. It pushes the value of the variable A onto the stack.
The pop instruction is similar -- pop A -- except that it pops a
value off of the stack and stores it into variable A.
The get A instruction prompts the user enter A > and stores the
inputted number in the variable A.
The put A instruction prints A = 123 where 123 is the value stored
in A.