Make memory sizes parameters

gen/program.go

@@ -2,14 +2,17 @@ package gen
 
 import "github.com/firestuff/subcoding/vm"
 
-func RandProgram() *vm.Program {
-	return &vm.Program{
-		Functions: []*vm.Function{
-			&vm.Function{
-				Instructions: []*vm.Instruction{
-					randInstruction(),
-				},
-			},
-		},
+func RandProgram(globalMemorySize, functionMemorySize uint64) *vm.Program {
+	prog := &vm.Program{
+		GlobalMemorySize:   globalMemorySize,
+		FunctionMemorySize: functionMemorySize,
 	}
+
+	prog.Functions = append(prog.Functions, &vm.Function{
+		Instructions: []*vm.Instruction{
+			randInstruction(prog),
+		},
+	})
+
+	return prog
 }