diff options
Diffstat (limited to 'vm0/vm.go')
| -rw-r--r-- | vm0/vm.go | 42 |
1 files changed, 24 insertions, 18 deletions
@@ -2,10 +2,8 @@ package vm0 import ( "fmt" - "strconv" "strings" - "github.com/gnolang/parscan/lang/golang" "github.com/gnolang/parscan/parser" ) @@ -37,14 +35,14 @@ func (i *Interp) Eval(src string) (r []any, err error) { } // Run implements a stack based virtual machine which directly walks the AST. -func (i *Interp) Run(node *parser.Node, scope string) ([]any, error) { +func (i *Interp) Run(node *parser.Node, scope string) (res []any, err error) { stop := false node.Walk2(nil, 0, func(n, a *parser.Node, k int) (ok bool) { // Node pre-order processing. switch n.Kind { - case golang.StmtBloc: - if a != nil && a.Kind == golang.IfStmt { + case parser.StmtBloc: + if a != nil && a.Kind == parser.IfStmt { // Control-flow in 'if' sub-tree if k == 1 { // 'if' first body branch, evaluated when condition is true. @@ -56,7 +54,7 @@ func (i *Interp) Run(node *parser.Node, scope string) ([]any, error) { // 'else' body branch, evaluated when condition is false. return !i.pop().(bool) } - case golang.FuncDecl: + case parser.FuncDecl: i.declareFunc(n, scope) return false } @@ -68,33 +66,41 @@ func (i *Interp) Run(node *parser.Node, scope string) ([]any, error) { } l := len(i.stack) switch n.Kind { - case golang.NumberLit: - num, _ := strconv.Atoi(n.Content()) // TODO(marc): compute num value at scanning. - i.push(num) - case golang.StringLit: + case parser.NumberLit: + switch v := n.Value().(type) { + case int64: + i.push(int(v)) + case error: + err = v + return false + default: + err = fmt.Errorf("type not supported: %T\n", v) + return false + } + case parser.StringLit: i.push(n.Block()) - case golang.InfOp: + case parser.InfOp: i.stack[l-2] = i.stack[l-2].(int) < i.stack[l-1].(int) i.stack = i.stack[:l-1] - case golang.AddOp: + case parser.AddOp: i.stack[l-2] = i.stack[l-2].(int) + i.stack[l-1].(int) i.stack = i.stack[:l-1] - case golang.SubOp: + case parser.SubOp: i.stack[l-2] = i.stack[l-2].(int) - i.stack[l-1].(int) i.stack = i.stack[:l-1] - case golang.MulOp: + case parser.MulOp: i.stack[l-2] = i.stack[l-2].(int) * i.stack[l-1].(int) i.stack = i.stack[:l-1] - case golang.AssignOp, golang.DefOp: + case parser.AssignOp, parser.DefOp: i.stack[i.stack[l-2].(int)] = i.stack[l-1] i.stack = i.stack[:l-2] - case golang.ReturnStmt: + case parser.ReturnStmt: stop = true return false - case golang.CallExpr: + case parser.CallExpr: i.push(len(n.Child[1].Child)) // number of arguments to call i.callFunc(n) - case golang.Ident: + case parser.Ident: name := n.Content() v, sc, ok := i.getSym(name, scope) fp := i.fp |