diff options
Diffstat (limited to 'parser/symbol.go')
| -rw-r--r-- | parser/symbol.go | 88 |
1 files changed, 44 insertions, 44 deletions
diff --git a/parser/symbol.go b/parser/symbol.go index 606752c..3aba4e5 100644 --- a/parser/symbol.go +++ b/parser/symbol.go @@ -8,54 +8,54 @@ import ( "github.com/mvertes/parscan/vm" ) -type symKind int +type SymKind int const ( - symValue symKind = iota // a Go value defined in the runtime - symType // a Go type - symLabel // a label indication a position in the VM code - symConst // a Go constant - symVar // a Go variable, located in the VM memory - symFunc // a Go function, located in the VM code - symPkg // a Go package + SymValue SymKind = iota // a value defined in the runtime + SymType // a type + SymLabel // a label indication a position in the VM code + SymConst // a constant + SymVar // a variable, located in the VM memory + SymFunc // a function, located in the VM code + SymPkg // a package ) -//go:generate stringer -type=symKind +//go:generate stringer -type=SymKind -const unsetAddr = -65535 +const UnsetAddr = -65535 -type symbol struct { - kind symKind - index int // address of symbol in frame - pkgPath string // - typ *vm.Type // - value vm.Value // - cval constant.Value // - local bool // if true address is relative to local frame, otherwise global - used bool // +type Symbol struct { + Kind SymKind + Index int // address of symbol in frame + PkgPath string // + Type *vm.Type // + Value vm.Value // + Cval constant.Value // + Local bool // if true address is relative to local frame, otherwise global + Used bool // } -func symtype(s *symbol) *vm.Type { - if s.typ != nil { - return s.typ +func SymbolType(s *Symbol) *vm.Type { + if s.Type != nil { + return s.Type } - return vm.TypeOf(s.value) + return vm.TypeOf(s.Value) } // AddSym add a new named value at memory position i in the parser symbol table. -func (p *Parser) AddSym(i int, name string, v vm.Value) { - p.addSym(i, name, v, symValue, nil, false) -} +// func (p *Parser) AddSym(i int, name string, v vm.Value) { +// p.addSym(i, name, v, SymValue, nil, false) +// } -func (p *Parser) addSym(i int, name string, v vm.Value, k symKind, t *vm.Type, local bool) { +func (p *Parser) AddSymbol(i int, name string, v vm.Value, k SymKind, t *vm.Type, local bool) { name = strings.TrimPrefix(name, "/") - p.symbols[name] = &symbol{kind: k, index: i, local: local, value: v, typ: t} + p.Symbols[name] = &Symbol{Kind: k, Index: i, Local: local, Value: v, Type: t} } -// getSym searches for an existing symbol starting from the deepest scope. -func (p *Parser) getSym(name, scope string) (sym *symbol, sc string, ok bool) { +// GetSym searches for an existing symbol starting from the deepest scope. +func (p *Parser) GetSym(name, scope string) (sym *Symbol, sc string, ok bool) { for { - if sym, ok = p.symbols[scope+"/"+name]; ok { + if sym, ok = p.Symbols[scope+"/"+name]; ok { return sym, scope, ok } i := strings.LastIndex(scope, "/") @@ -66,23 +66,23 @@ func (p *Parser) getSym(name, scope string) (sym *symbol, sc string, ok bool) { break } } - sym, ok = p.symbols[name] + sym, ok = p.Symbols[name] return sym, scope, ok } -func initUniverse() map[string]*symbol { - return map[string]*symbol{ - "any": {kind: symType, index: unsetAddr, typ: vm.TypeOf((*any)(nil)).Elem()}, - "bool": {kind: symType, index: unsetAddr, typ: vm.TypeOf((*bool)(nil)).Elem()}, - "error": {kind: symType, index: unsetAddr, typ: vm.TypeOf((*error)(nil)).Elem()}, - "int": {kind: symType, index: unsetAddr, typ: vm.TypeOf((*int)(nil)).Elem()}, - "string": {kind: symType, index: unsetAddr, typ: vm.TypeOf((*string)(nil)).Elem()}, +func initUniverse() map[string]*Symbol { + return map[string]*Symbol{ + "any": {Kind: SymType, Index: UnsetAddr, Type: vm.TypeOf((*any)(nil)).Elem()}, + "bool": {Kind: SymType, Index: UnsetAddr, Type: vm.TypeOf((*bool)(nil)).Elem()}, + "error": {Kind: SymType, Index: UnsetAddr, Type: vm.TypeOf((*error)(nil)).Elem()}, + "int": {Kind: SymType, Index: UnsetAddr, Type: vm.TypeOf((*int)(nil)).Elem()}, + "string": {Kind: SymType, Index: UnsetAddr, Type: vm.TypeOf((*string)(nil)).Elem()}, - "nil": {index: unsetAddr}, - "iota": {kind: symConst, index: unsetAddr}, - "true": {index: unsetAddr, value: vm.ValueOf(true), typ: vm.TypeOf(true)}, - "false": {index: unsetAddr, value: vm.ValueOf(false), typ: vm.TypeOf(false)}, + "nil": {Index: UnsetAddr}, + "iota": {Kind: SymConst, Index: UnsetAddr}, + "true": {Index: UnsetAddr, Value: vm.ValueOf(true), Type: vm.TypeOf(true)}, + "false": {Index: UnsetAddr, Value: vm.ValueOf(false), Type: vm.TypeOf(false)}, - "println": {index: unsetAddr, value: vm.ValueOf(func(v ...any) { fmt.Println(v...) })}, + "println": {Index: UnsetAddr, Value: vm.ValueOf(func(v ...any) { fmt.Println(v...) })}, } } |