/
parse_type.v
755 lines (733 loc) · 19.7 KB
/
parse_type.v
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// Copyright (c) 2019-2022 Alexander Medvednikov. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
module parser
import v.transformer
import v.ast
import v.util
import v.token
const maximum_inline_sum_type_variants = 3
pub fn (mut p Parser) parse_array_type(expecting token.Kind) ast.Type {
p.check(expecting)
// fixed array
if p.tok.kind in [.number, .name] {
mut fixed_size := 0
size_expr := p.expr(0)
if p.pref.is_fmt {
fixed_size = 987654321
} else {
match size_expr {
ast.IntegerLiteral {
fixed_size = size_expr.val.int()
}
ast.Ident {
mut show_non_const_error := false
if mut const_field := p.table.global_scope.find_const('${p.mod}.$size_expr.name') {
if mut const_field.expr is ast.IntegerLiteral {
fixed_size = const_field.expr.val.int()
} else {
if mut const_field.expr is ast.InfixExpr {
// QUESTION: this should most likely no be done in the parser, right?
mut t := transformer.new_transformer(p.pref)
folded_expr := t.infix_expr(mut const_field.expr)
if folded_expr is ast.IntegerLiteral {
fixed_size = folded_expr.val.int()
} else {
show_non_const_error = true
}
} else {
show_non_const_error = true
}
}
} else {
if p.pref.is_fmt {
// for vfmt purposes, pretend the constant does exist
// it may have been defined in another .v file:
fixed_size = 1
} else {
show_non_const_error = true
}
}
if show_non_const_error {
p.error_with_pos('non-constant array bound `$size_expr.name`',
size_expr.pos)
}
}
else {
p.error_with_pos('fixed array size cannot use non-constant value',
size_expr.pos())
}
}
}
p.check(.rsbr)
elem_type := p.parse_type()
if elem_type.idx() == 0 {
// error is handled by parse_type
return 0
}
if fixed_size <= 0 {
p.error_with_pos('fixed size cannot be zero or negative', size_expr.pos())
}
idx := p.table.find_or_register_array_fixed(elem_type, fixed_size, size_expr)
if elem_type.has_flag(.generic) {
return ast.new_type(idx).set_flag(.generic)
}
return ast.new_type(idx)
}
// array
p.check(.rsbr)
elem_type := p.parse_type()
if elem_type.idx() == 0 {
// error is set in parse_type
return 0
}
if elem_type.idx() == ast.thread_type_idx {
p.register_auto_import('sync.threads')
}
mut nr_dims := 1
// detect attr
not_attr := p.peek_tok.kind != .name && p.peek_token(2).kind !in [.semicolon, .rsbr]
for p.tok.kind == expecting && not_attr {
p.next()
p.check(.rsbr)
nr_dims++
}
idx := p.table.find_or_register_array_with_dims(elem_type, nr_dims)
if elem_type.has_flag(.generic) {
return ast.new_type(idx).set_flag(.generic)
}
return ast.new_type(idx)
}
pub fn (mut p Parser) parse_map_type() ast.Type {
p.next()
if p.tok.kind != .lsbr {
return ast.map_type
}
p.check(.lsbr)
key_type := p.parse_type()
if key_type.idx() == 0 {
// error is reported in parse_type
return 0
}
key_sym := p.table.sym(key_type)
is_alias := key_sym.kind == .alias
key_type_supported := key_type in [ast.string_type_idx, ast.voidptr_type_idx]
|| key_sym.kind in [.enum_, .placeholder, .any]
|| ((key_type.is_int() || key_type.is_float() || is_alias) && !key_type.is_ptr())
if !key_type_supported {
if is_alias {
p.error('cannot use the alias type as the parent type is unsupported')
return 0
}
s := p.table.type_to_str(key_type)
p.error_with_pos('maps only support string, integer, float, rune, enum or voidptr keys for now (not `$s`)',
p.tok.pos())
return 0
}
p.check(.rsbr)
value_type := p.parse_type()
if value_type.idx() == 0 {
// error is reported in parse_type
return 0
}
if value_type.idx() == ast.void_type_idx {
p.error_with_pos('map value type cannot be void', p.tok.pos())
return 0
}
idx := p.table.find_or_register_map(key_type, value_type)
if key_type.has_flag(.generic) || value_type.has_flag(.generic) {
return ast.new_type(idx).set_flag(.generic)
}
return ast.new_type(idx)
}
pub fn (mut p Parser) parse_chan_type() ast.Type {
if p.peek_tok.kind !in [.name, .key_mut, .amp, .lsbr] {
p.next()
return ast.chan_type
}
p.register_auto_import('sync')
p.next()
is_mut := p.tok.kind == .key_mut
elem_type := p.parse_type()
idx := p.table.find_or_register_chan(elem_type, is_mut)
if elem_type.has_flag(.generic) {
return ast.new_type(idx).set_flag(.generic)
}
return ast.new_type(idx)
}
pub fn (mut p Parser) parse_thread_type() ast.Type {
is_opt := p.peek_tok.kind == .question
if is_opt {
p.next()
}
if p.peek_tok.kind !in [.name, .key_mut, .amp, .lsbr] {
p.next()
if is_opt {
mut ret_type := ast.void_type
ret_type = ret_type.set_flag(.optional)
idx := p.table.find_or_register_thread(ret_type)
return ast.new_type(idx)
} else {
return ast.thread_type
}
}
if !is_opt {
p.next()
}
ret_type := p.parse_type()
idx := p.table.find_or_register_thread(ret_type)
if ret_type.has_flag(.generic) {
return ast.new_type(idx).set_flag(.generic)
}
return ast.new_type(idx)
}
pub fn (mut p Parser) parse_multi_return_type() ast.Type {
p.check(.lpar)
mut mr_types := []ast.Type{}
mut has_generic := false
for p.tok.kind !in [.eof, .rpar] {
mr_type := p.parse_type()
if mr_type.idx() == 0 {
break
}
if mr_type.has_flag(.generic) {
has_generic = true
}
mr_types << mr_type
if p.tok.kind == .comma {
p.next()
} else {
break
}
}
p.check(.rpar)
if mr_types.len == 1 {
// no multi return type needed
return mr_types[0]
}
idx := p.table.find_or_register_multi_return(mr_types)
if has_generic {
return ast.new_type(idx).set_flag(.generic)
}
return ast.new_type(idx)
}
// given anon name based off signature when `name` is blank
pub fn (mut p Parser) parse_fn_type(name string) ast.Type {
p.check(.key_fn)
for attr in p.attrs {
match attr.name {
'callconv' {
if !attr.has_arg {
p.error_with_pos('callconv attribute is present but its value is missing',
p.prev_tok.pos())
}
if attr.arg !in ['stdcall', 'fastcall', 'cdecl'] {
p.error_with_pos('unsupported calling convention, supported are stdcall, fastcall and cdecl',
p.prev_tok.pos())
}
}
else {}
}
}
mut has_generic := false
line_nr := p.tok.line_nr
args, _, is_variadic := p.fn_args()
for arg in args {
if arg.typ.has_flag(.generic) {
has_generic = true
break
}
}
mut return_type := ast.void_type
mut return_type_pos := token.Pos{}
if p.tok.line_nr == line_nr && p.tok.kind.is_start_of_type() && !p.is_attributes() {
return_type_pos = p.tok.pos()
return_type = p.parse_type()
if return_type.has_flag(.generic) {
has_generic = true
}
return_type_pos = return_type_pos.extend(p.prev_tok.pos())
}
func := ast.Fn{
name: name
params: args
is_variadic: is_variadic
return_type: return_type
return_type_pos: return_type_pos
is_method: false
attrs: p.attrs
}
// MapFooFn typedefs are manually added in cheaders.v
// because typedefs get generated after the map struct is generated
has_decl := p.builtin_mod && name.starts_with('Map') && name.ends_with('Fn')
idx := p.table.find_or_register_fn_type(p.mod, func, false, has_decl)
if has_generic {
return ast.new_type(idx).set_flag(.generic)
}
return ast.new_type(idx)
}
pub fn (mut p Parser) parse_type_with_mut(is_mut bool) ast.Type {
typ := p.parse_type()
if is_mut {
return typ.set_nr_muls(1)
}
return typ
}
// Parses any language indicators on a type.
pub fn (mut p Parser) parse_language() ast.Language {
language := if p.tok.lit == 'C' {
ast.Language.c
} else if p.tok.lit == 'JS' {
ast.Language.js
} else {
ast.Language.v
}
if language != .v {
p.next()
p.check(.dot)
}
return language
}
// parse_inline_sum_type parses the type and registers it in case the type is an anonymous sum type.
// It also takes care of inline sum types where parse_type only parses a standalone type.
pub fn (mut p Parser) parse_inline_sum_type() ast.Type {
variants := p.parse_sum_type_variants()
if variants.len > 1 {
if variants.len > parser.maximum_inline_sum_type_variants {
pos := variants[0].pos.extend(variants[variants.len - 1].pos)
p.warn_with_pos('an inline sum type expects a maximum of $parser.maximum_inline_sum_type_variants types ($variants.len were given)',
pos)
}
mut variant_names := variants.map(p.table.sym(it.typ).name)
variant_names.sort()
// deterministic name
name := '_v_anon_sum_type_${variant_names.join('_')}'
variant_types := variants.map(it.typ)
prepend_mod_name := p.prepend_mod(name)
mut idx := p.table.find_type_idx(prepend_mod_name)
if idx > 0 {
return ast.new_type(idx)
}
idx = p.table.register_sym(ast.TypeSymbol{
kind: .sum_type
name: prepend_mod_name
cname: util.no_dots(prepend_mod_name)
mod: p.mod
info: ast.SumType{
is_anon: true
variants: variant_types
}
})
return ast.new_type(idx)
} else if variants.len == 1 {
return variants[0].typ
}
return ast.Type(0)
}
// parse_sum_type_variants parses several types separated with a pipe and returns them as a list with at least one node.
// If there is less than one node, it will add an error to the error list.
pub fn (mut p Parser) parse_sum_type_variants() []ast.TypeNode {
p.inside_sum_type = true
defer {
p.inside_sum_type = false
}
mut types := []ast.TypeNode{}
for {
type_start_pos := p.tok.pos()
typ := p.parse_type()
// TODO: needs to be its own var, otherwise TCC fails because of a known stack error
prev_tok := p.prev_tok
type_end_pos := prev_tok.pos()
type_pos := type_start_pos.extend(type_end_pos)
types << ast.TypeNode{
typ: typ
pos: type_pos
}
if p.tok.kind != .pipe {
break
}
p.check(.pipe)
}
return types
}
pub fn (mut p Parser) parse_type() ast.Type {
// optional or result
mut is_optional := false
mut is_result := false
line_nr := p.tok.line_nr
optional_pos := p.tok.pos()
if p.tok.kind == .question {
p.next()
is_optional = true
} else if p.tok.kind == .not {
p.next()
is_result = true
}
if (is_optional || is_result) && (p.tok.line_nr > line_nr || p.tok.kind in [.comma, .rpar]) {
mut typ := ast.void_type
if is_optional {
typ = typ.set_flag(.optional)
} else if is_result {
typ = typ.set_flag(.result)
}
return typ
}
is_shared := p.tok.kind == .key_shared
is_atomic := p.tok.kind == .key_atomic
if is_shared {
p.register_auto_import('sync')
}
mut nr_muls := 0
if p.tok.kind == .key_mut {
if p.inside_fn_return {
p.error_with_pos('cannot use `mut` on fn return type', p.tok.pos())
} else if p.inside_struct_field_decl {
p.error_with_pos('cannot use `mut` on struct field type', p.tok.pos())
}
}
if p.tok.kind == .key_mut || is_shared {
nr_muls++
p.next()
}
if is_atomic {
p.next()
}
if p.tok.kind == .mul {
p.error('use `&Type` instead of `*Type` when declaring references')
return 0
}
mut nr_amps := 0
// &Type
for p.tok.kind == .amp {
nr_amps++
nr_muls++
p.next()
}
// Anon structs
if p.tok.kind == .key_struct {
struct_decl := p.struct_decl(true)
// Find the registered anon struct type, it was registered above in `p.struct_decl()`
return p.table.find_type_idx(struct_decl.name)
}
language := p.parse_language()
mut typ := ast.void_type
is_array := p.tok.kind == .lsbr
if p.tok.kind != .lcbr {
pos := p.tok.pos()
typ = p.parse_any_type(language, nr_muls > 0, true)
if typ.idx() == 0 {
// error is set in parse_type
return 0
}
if typ == ast.void_type {
p.error_with_pos('use `?` instead of `?void`', pos)
return 0
}
sym := p.table.sym(typ)
if is_optional && sym.info is ast.SumType && (sym.info as ast.SumType).is_anon {
p.error_with_pos('an inline sum type cannot be optional', optional_pos.extend(p.prev_tok.pos()))
}
}
if is_optional {
typ = typ.set_flag(.optional)
}
if is_result {
typ = typ.set_flag(.result)
}
if is_shared {
typ = typ.set_flag(.shared_f)
}
if is_atomic {
typ = typ.set_flag(.atomic_f)
}
if nr_muls > 0 {
typ = typ.set_nr_muls(nr_muls)
if is_array && nr_amps > 0 {
p.error('V arrays are already references behind the scenes,
there is no need to use a reference to an array (e.g. use `[]string` instead of `&[]string`).
If you need to modify an array in a function, use a mutable argument instead: `fn foo(mut s []string) {}`.')
return 0
}
}
return typ
}
pub fn (mut p Parser) parse_any_type(language ast.Language, is_ptr bool, check_dot bool) ast.Type {
mut name := p.tok.lit
if language == .c {
name = 'C.$name'
} else if language == .js {
name = 'JS.$name'
} else if p.peek_tok.kind == .dot && check_dot {
// `module.Type`
mut mod := name
mut mod_pos := p.tok.pos()
p.next()
p.check(.dot)
mut mod_last_part := mod
for p.peek_tok.kind == .dot {
mod_pos = mod_pos.extend(p.tok.pos())
mod_last_part = p.tok.lit
mod += '.$mod_last_part'
p.next()
p.check(.dot)
}
if !p.known_import(mod) && !p.pref.is_fmt {
mut msg := 'unknown module `$mod`'
if mod.len > mod_last_part.len && p.known_import(mod_last_part) {
msg += '; did you mean `$mod_last_part`?'
}
p.error_with_pos(msg, mod_pos)
return 0
}
if mod in p.imports {
p.register_used_import(mod)
mod = p.imports[mod]
}
// prefix with full module
name = '${mod}.$p.tok.lit'
if p.tok.lit.len > 0 && !p.tok.lit[0].is_capital() {
p.error('imported types must start with a capital letter')
return 0
}
} else if p.expr_mod != '' && !p.inside_generic_params {
// p.expr_mod is from the struct and not from the generic parameter
name = p.expr_mod + '.' + name
} else if name in p.imported_symbols {
name = p.imported_symbols[name]
} else if !p.builtin_mod && name.len > 1 && name !in p.table.type_idxs {
// `Foo` in module `mod` means `mod.Foo`
name = p.mod + '.' + name
}
match p.tok.kind {
.key_fn {
// func
return p.parse_fn_type('')
}
.lsbr, .nilsbr {
// array
return p.parse_array_type(p.tok.kind)
}
else {
if p.tok.kind == .lpar && !p.inside_sum_type {
// multiple return
if is_ptr {
p.unexpected(prepend_msg: 'parse_type:', got: '`&` before multiple returns')
return 0
}
return p.parse_multi_return_type()
}
if ((p.peek_tok.kind == .dot && p.peek_token(3).kind == .pipe)
|| p.peek_tok.kind == .pipe) && !p.inside_sum_type && !p.inside_receiver_param {
return p.parse_inline_sum_type()
}
if name == 'map' {
return p.parse_map_type()
}
if name == 'chan' {
return p.parse_chan_type()
}
if name == 'thread' {
return p.parse_thread_type()
}
mut ret := ast.Type(0)
if name == '' {
// This means the developer is using some wrong syntax like `x: int` instead of `x int`
p.error('expecting type declaration')
} else {
match name {
'voidptr' {
ret = ast.voidptr_type
}
'byteptr' {
ret = ast.byteptr_type
}
'charptr' {
ret = ast.charptr_type
}
'i8' {
ret = ast.i8_type
}
'i16' {
ret = ast.i16_type
}
'int' {
ret = ast.int_type
}
'i64' {
ret = ast.i64_type
}
'u8' {
ret = ast.u8_type
}
'u16' {
ret = ast.u16_type
}
'u32' {
ret = ast.u32_type
}
'u64' {
ret = ast.u64_type
}
'f32' {
ret = ast.f32_type
}
'f64' {
ret = ast.f64_type
}
'string' {
ret = ast.string_type
}
'char' {
ret = ast.char_type
}
'bool' {
ret = ast.bool_type
}
'float_literal' {
ret = ast.float_literal_type
}
'int_literal' {
ret = ast.int_literal_type
}
'any' {
if p.file_backend_mode != .js && p.mod != 'builtin' {
p.error('cannot use `any` type here, `any` will be implemented in V 0.4')
}
ret = ast.any_type
}
else {
p.next()
if name.len == 1 && name[0].is_capital() {
return p.parse_generic_type(name)
}
if p.tok.kind == .lt {
return p.parse_generic_inst_type(name)
}
return p.find_type_or_add_placeholder(name, language)
}
}
}
p.next()
return ret
}
}
}
pub fn (mut p Parser) find_type_or_add_placeholder(name string, language ast.Language) ast.Type {
// struct / enum / placeholder
mut idx := p.table.find_type_idx(name)
if idx > 0 {
return ast.new_type(idx)
}
// not found - add placeholder
idx = p.table.add_placeholder_type(name, language)
return ast.new_type(idx)
}
pub fn (mut p Parser) parse_generic_type(name string) ast.Type {
mut idx := p.table.find_type_idx(name)
if idx > 0 {
return ast.new_type(idx).set_flag(.generic)
}
idx = p.table.register_sym(ast.TypeSymbol{
name: name
cname: util.no_dots(name)
mod: p.mod
kind: .any
is_pub: true
})
return ast.new_type(idx).set_flag(.generic)
}
pub fn (mut p Parser) parse_generic_inst_type(name string) ast.Type {
mut bs_name := name
mut bs_cname := name
start_pos := p.tok.pos()
p.next()
p.inside_generic_params = true
bs_name += '<'
bs_cname += '_T_'
mut concrete_types := []ast.Type{}
mut is_instance := false
for p.tok.kind != .eof {
mut type_pos := p.tok.pos()
gt := p.parse_type()
type_pos = type_pos.extend(p.prev_tok.pos())
if !gt.has_flag(.generic) {
is_instance = true
}
gts := p.table.sym(gt)
if !is_instance && gts.name.len > 1 {
p.error_with_pos('generic struct parameter name needs to be exactly one char',
type_pos)
}
bs_name += gts.name
bs_cname += gts.cname
concrete_types << gt
if p.tok.kind != .comma {
break
}
p.next()
bs_name += ', '
bs_cname += '_'
}
if !is_instance {
p.struct_init_generic_types = concrete_types
}
concrete_types_pos := start_pos.extend(p.tok.pos())
p.check(.gt)
p.inside_generic_params = false
bs_name += '>'
// fmt operates on a per-file basis, so is_instance might be not set correctly. Thus it's ignored.
if (is_instance || p.pref.is_fmt) && concrete_types.len > 0 {
mut gt_idx := p.table.find_type_idx(bs_name)
if gt_idx > 0 {
return ast.new_type(gt_idx)
}
gt_idx = p.table.add_placeholder_type(bs_name, .v)
mut parent_idx := p.table.type_idxs[name]
if parent_idx == 0 {
parent_idx = p.table.add_placeholder_type(name, .v)
}
parent_sym := p.table.sym(ast.new_type(parent_idx))
match parent_sym.info {
ast.Struct {
if parent_sym.info.generic_types.len == 0 {
p.error_with_pos('struct `$parent_sym.name` is not a generic struct, cannot instantiate to the concrete types',
concrete_types_pos)
} else if parent_sym.info.generic_types.len != concrete_types.len {
p.error_with_pos('the number of generic types of struct `$parent_sym.name` is inconsistent with the concrete types',
concrete_types_pos)
}
}
ast.Interface {
if parent_sym.info.generic_types.len == 0 {
p.error_with_pos('interface `$parent_sym.name` is not a generic interface, cannot instantiate to the concrete types',
concrete_types_pos)
} else if parent_sym.info.generic_types.len != concrete_types.len {
p.error_with_pos('the number of generic types of interfce `$parent_sym.name` is inconsistent with the concrete types',
concrete_types_pos)
}
}
ast.SumType {
if parent_sym.info.generic_types.len == 0 {
p.error_with_pos('sumtype `$parent_sym.name` is not a generic sumtype, cannot instantiate to the concrete types',
concrete_types_pos)
} else if parent_sym.info.generic_types.len != concrete_types.len {
p.error_with_pos('the number of generic types of sumtype `$parent_sym.name` is inconsistent with the concrete types',
concrete_types_pos)
}
}
else {}
}
idx := p.table.register_sym(ast.TypeSymbol{
kind: .generic_inst
name: bs_name
cname: util.no_dots(bs_cname)
mod: p.mod
info: ast.GenericInst{
parent_idx: parent_idx
concrete_types: concrete_types
}
})
return ast.new_type(idx)
}
return p.find_type_or_add_placeholder(name, .v).set_flag(.generic)
}