- vm1-lib: .NET standard lib which has all common implementations
- Core part of the stack machine
- vm1-test: xUnit test project for vm1-lib
- CTRL-R CTRL-A to execute all tests in Visual Studio
- vm1-assembler: Read assembler source and output bytecode
- vm1-console: Bytecode runner which runs a specified bytecode on VM
- Read source code and output bytecode as below
source file: Sample.asm
// any line starts with '//' is a comment
iconst 1
print // '//' works in the middle of lines
iconst 2
print
iconst 3
print
iconst 40
iconst 2
iadd
print
halt
output file (bytecode): Sample.bc
09 00 00 00 01 00 00 00 0E 00 00 00 09 00 00 00
02 00 00 00 0E 00 00 00 09 00 00 00 03 00 00 00
0E 00 00 00 09 00 00 00 28 00 00 00 09 00 00 00
02 00 00 00 01 00 00 00 0E 00 00 00 12 00 00 00- Sample usage
dotnet run --project vm1-assembler -s vm1-assembler/Sample.asm -o Sample.bc- Labels and label jump/label call are supported
// labels (FUNC:) are supported
iconst 42
call FUNC: 1
halt
FUNC:
load -3
print
ret- Read byte code (generated by vm1-assembler) and run it on the stack machine (VM)
- Sample usage
dotnet run --project vm1-console -s Sample.bc -t true- When you call a function, push arguments and call 'call' with the number of args
- For example, calling ADD(a, b) is as below.
- The call pushes nargs, fp and return adddress(ip) before jumping to the ADD function
iconst 42
// stack
// 0: 42
iconst 3
// stack
// 1: 3
// 0: 42
call ADD: 2
halt
ADD:
// stack
// 4: 7 <- return address = sp = fp
// 3: 0 <-old fp
// 2: 2 <-nargs
// 1: 3 <-2nd arg
// 0: 42 <-1st arg
load -4
// 1st arg (fp-4) is pushed
// stack
// 5: 42 <- local variable 1st arg = sp
// 4: 7 <- return address = fp
// 3: 0 <-old fp
// 2: 2 <-nargs
// 1: 3 <-2nd arg
// 0: 42 <-1st arg
load -3
// 2nd arg (fp-3) is pushed
// stack
// 6: 3 <- local variable 2nd arg = sp
// 5: 42 <- local variable 1st arg
// 4: 7 <- return address = fp
// 3: 0 <-old fp
// 2: 2 <-nargs
// 1: 3 <-2nd arg
// 0: 42 <-1st arg
iadd
// add 2 stack top variables and store the result on top
// stack
// 5: 45 <- 42+3
// 4: 7 <- return address = fp
// 3: 0 <-old fp
// 2: 2 <-nargs
// 1: 3 <-2nd arg
// 0: 42 <-1st arg
print
// pop and print stack top 45
// stack
// 4: 7 <- return address = fp
// 3: 0 <-old fp
// 2: 2 <-nargs
// 1: 3 <-2nd arg
// 0: 42 <-1st arg
ret
// restore old fp, unwind stack and return to ip
// stack (empty)
- Buildable/executable on both MacOS/VisualStudio for Mac and Windows/VisualStudio for Win