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package vm
import (
"fmt"
"log"
"reflect"
"testing"
)
func init() {
log.SetFlags(log.Lshortfile)
}
func TestVM(t *testing.T) {
for _, test := range tests {
test := test
t.Run("", func(t *testing.T) {
m := &Machine{}
for _, v := range test.sym {
m.Push(v)
}
m.PushCode(test.code...)
if err := m.Run(); err != nil {
t.Errorf("run error: %v", err)
}
t.Log(Vstring(m.mem))
if r := Vstring(m.mem[test.start:test.end]); r != test.mem {
t.Errorf("got %v, want %v", r, test.mem)
}
})
}
}
func BenchmarkVM(b *testing.B) {
for _, test := range tests {
test := test
b.Run("", func(b *testing.B) {
for i := 0; i < b.N; i++ {
b.StopTimer()
m := &Machine{}
m.PushCode(test.code...)
b.StartTimer()
if err := m.Run(); err != nil {
b.Errorf("run error: %v", err)
}
}
})
}
}
var tests = []struct {
//sym []any // initial memory values
sym []reflect.Value // initial memory values
code [][]int64 // bytecode to execute
start, end int //
mem string // expected memory content
}{{ // #00 -- A simple addition.
code: [][]int64{
{0, Push, 1},
{0, Push, 2},
{0, Add},
{0, Exit},
},
start: 0, end: 1, mem: "[3]",
}, { // #01 -- Calling a function defined outside the VM.
sym: []reflect.Value{reflect.ValueOf(fmt.Println), reflect.ValueOf("Hello")},
code: [][]int64{
{0, Dup, 0},
{0, CallX, 1},
{0, Exit},
},
start: 1, end: 3, mem: "[6 <nil>]",
}, { // #02 -- Defining and calling a function in VM.
code: [][]int64{
{0, Jump, 3}, // 0
{0, Push, 3}, // 1
{0, Return, 1, 1}, // 2
{0, Push, 1}, // 3
{0, Calli, -3}, // 4
{0, Exit}, // 5
},
start: 0, end: 1, mem: "[3]",
}, { // #03 -- Defining and calling a function in VM.
code: [][]int64{
{0, Jump, 3}, // 0
{0, Push, 3}, // 1
{0, Return, 1, 1}, // 2
{0, Push, 1}, // 3
{0, Push, 1}, // 4
{0, Call}, // 5
{0, Exit}, // 6
},
start: 0, end: 1, mem: "[3]",
}, { // #04 -- Defining and calling a function in VM.
code: [][]int64{
{0, Jump, 5}, // 0
{0, Push, 3}, // 1
{0, Fassign, -2}, // 2
{0, Fdup, -2}, // 3
{0, Return, 1, 1}, // 4
{0, Push, 1}, // 5
{0, Push, 1}, // 6
{0, Call}, // 7
{0, Exit}, // 8
},
start: 0, end: 1, mem: "[3]",
}, { // #05 -- Fibonacci numbers, hand written. Showcase recursivity.
code: [][]int64{
{0, Jump, 19}, // 0
{0, Push, 2}, // 2 [2]
{0, Fdup, -2}, // 1 [2 i]
{0, Lower}, // 3 [true/false]
{0, JumpTrue, 13}, // 4 [], goto 17
{0, Push, 2}, // 6 [i 2]
{0, Fdup, -2}, // 5 [i]
{0, Sub}, // 7 [(i-2)]
{0, Push, 1}, // 8
{0, Call}, // 9 [fib(i-2)]
{0, Push, 1}, // 11 [(i-2) i 1]
{0, Fdup, -2}, // 10 [fib(i-2) i]
{0, Sub}, // 12 [(i-2) (i-1)]
{0, Push, 1}, // 13
{0, Call}, // 14 [fib(i-2) fib(i-1)]
{0, Add}, // 15 [fib(i-2)+fib(i-1)]
{0, Return, 1, 1}, // 16 return i
{0, Fdup, -2}, // 17 [i]
{0, Return, 1, 1}, // 18 return i
{0, Push, 6}, // 19 [1]
{0, Push, 1}, // 20
{0, Call}, // 21 [fib(*1)]
{0, Exit}, // 22
},
start: 0, end: 1, mem: "[8]",
}, { // #06 -- Fibonacci with some immediate instructions.
code: [][]int64{
{0, Jump, 14}, // 0
{0, Fdup, -2}, // 1 [i]
{0, Loweri, 2}, // 2 [true/false]
{0, JumpTrue, 9}, // 3 [], goto 12
{0, Fdup, -2}, // 4 [i]
{0, Subi, 2}, // 5 [(i-2)]
{0, Calli, -5}, // 6 [fib(i-2)]
{0, Fdup, -2}, // 7 [fib(i-2) i]
{0, Subi, 1}, // 8 [(i-2) (i-1)]
{0, Calli, -8}, // 9 [fib(i-2) fib(i-1)], call 1
{0, Add}, // 10 [fib(i-2)+fib(i-1)]
{0, Return, 1, 1}, // 11 return i
{0, Fdup, -2}, // 12 [i]
{0, Return, 1, 1}, // 13 return i
{0, Push, 6}, // 14 [1]
{0, Calli, -14}, // 15 [fib(*1)], call 1
{0, Exit}, // 16
},
start: 0, end: 1, mem: "[8]",
}}
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