mirror of
https://github.com/vlang/v.git
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737 lines
18 KiB
V
737 lines
18 KiB
V
// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
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// Use of this source code is governed by an MIT license
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// that can be found in the LICENSE file.
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module compiler
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fn (p mut Parser) bool_expression() string {
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tok := p.tok
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typ := p.bterm()
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mut got_and := false // to catch `a && b || c` in one expression without ()
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mut got_or := false
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for p.tok == .and || p.tok == .logical_or {
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if p.tok == .and {
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got_and = true
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if got_or { p.error(and_or_error) }
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}
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if p.tok == .logical_or {
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got_or = true
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if got_and { p.error(and_or_error) }
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}
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if p.is_sql {
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if p.tok == .and {
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p.gen(' and ')
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}
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else if p.tok == .logical_or {
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p.gen(' or ')
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}
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} else {
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p.gen(' ${p.tok.str()} ')
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}
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p.check_space(p.tok)
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p.check_types(p.bterm(), typ)
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if typ != 'bool' {
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p.error('logical operators `&&` and `||` require booleans')
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}
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}
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if typ == '' {
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println('curline:')
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println(p.cgen.cur_line)
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println(tok.str())
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p.error('expr() returns empty type')
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}
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return typ
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}
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fn (p mut Parser) bterm() string {
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ph := p.cgen.add_placeholder()
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mut typ := p.expression()
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p.expected_type = typ
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is_str := typ=='string' && !p.is_sql
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is_ustr := typ=='ustring'
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is_float := typ[0] == `f` && (typ in ['f64', 'f32']) &&
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!(p.cur_fn.name in ['f64_abs', 'f32_abs']) &&
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!(p.cur_fn.name == 'eq')
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is_array := typ.contains('array_')
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expr_type := typ
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tok := p.tok
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if tok in [.eq, .gt, .lt, .le, .ge, .ne] {
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//TODO: remove when array comparing is supported
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if is_array {
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p.error('array comparing is not supported yet')
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}
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p.fspace()
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//p.fgen(' ${p.tok.str()} ')
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if (is_float || is_str || is_ustr) && !p.is_js {
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p.gen(',')
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}
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else if p.is_sql && tok == .eq {
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p.gen('=')
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}
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else {
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p.gen(tok.str())
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}
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p.next()
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p.fspace()
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// `id == user.id` => `id == $1`, `user.id`
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if p.is_sql {
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p.sql_i++
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p.gen('$' + p.sql_i.str())
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p.cgen.start_cut()
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p.check_types(p.expression(), typ)
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sql_param := p.cgen.cut()
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p.sql_params << sql_param
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p.sql_types << typ
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//println('*** sql type: $typ | param: $sql_param')
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} else {
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p.check_types(p.expression(), typ)
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}
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typ = 'bool'
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if is_str && !p.is_js { //&& !p.is_sql {
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p.gen(')')
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match tok {
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.eq { p.cgen.set_placeholder(ph, 'string_eq(') }
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.ne { p.cgen.set_placeholder(ph, 'string_ne(') }
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.le { p.cgen.set_placeholder(ph, 'string_le(') }
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.ge { p.cgen.set_placeholder(ph, 'string_ge(') }
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.gt { p.cgen.set_placeholder(ph, 'string_gt(') }
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.lt { p.cgen.set_placeholder(ph, 'string_lt(') }
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}
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}
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if is_ustr {
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p.gen(')')
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match tok {
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.eq { p.cgen.set_placeholder(ph, 'ustring_eq(') }
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.ne { p.cgen.set_placeholder(ph, 'ustring_ne(') }
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.le { p.cgen.set_placeholder(ph, 'ustring_le(') }
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.ge { p.cgen.set_placeholder(ph, 'ustring_ge(') }
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.gt { p.cgen.set_placeholder(ph, 'ustring_gt(') }
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.lt { p.cgen.set_placeholder(ph, 'ustring_lt(') }
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}
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}
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if is_float && p.cur_fn.name != 'f32_abs' && p.cur_fn.name != 'f64_abs' {
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p.gen(')')
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match tok {
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.eq { p.cgen.set_placeholder(ph, '${expr_type}_eq(') }
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.ne { p.cgen.set_placeholder(ph, '${expr_type}_ne(') }
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.le { p.cgen.set_placeholder(ph, '${expr_type}_le(') }
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.ge { p.cgen.set_placeholder(ph, '${expr_type}_ge(') }
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.gt { p.cgen.set_placeholder(ph, '${expr_type}_gt(') }
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.lt { p.cgen.set_placeholder(ph, '${expr_type}_lt(') }
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}
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}
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}
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return typ
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}
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// also called on *, &, @, . (enum)
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fn (p mut Parser) name_expr() string {
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p.has_immutable_field = false
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p.is_const_literal = false
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ph := p.cgen.add_placeholder()
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// amp
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ptr := p.tok == .amp
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deref := p.tok == .mul
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mut mul_nr := 0
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mut deref_nr := 0
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for {
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if p.tok == .amp {
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mul_nr++
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}else if p.tok == .mul {
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deref_nr++
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}else {
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break
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}
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p.next()
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}
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if p.tok == .lpar {
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p.gen('*'.repeat(deref_nr))
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p.gen('(')
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p.check(.lpar)
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mut temp_type := p.bool_expression()
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p.gen(')')
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p.check(.rpar)
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for _ in 0..deref_nr {
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temp_type = temp_type.replace_once('*', '')
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}
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return temp_type
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}
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mut name := p.lit
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// Raw string (`s := r'hello \n ')
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if name == 'r' && p.peek() == .str {
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p.string_expr()
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return 'string'
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}
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// known_type := p.table.known_type(name)
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orig_name := name
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is_c := name == 'C' && p.peek() == .dot
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if is_c {
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p.check(.name)
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p.check(.dot)
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name = p.lit
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// C struct initialization
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if p.peek() == .lcbr && p.table.known_type(name) {
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return p.get_struct_type(name, true, ptr)
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}
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// C function
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if p.peek() == .lpar {
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return p.get_c_func_type(name)
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}
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// C const (`C.GLFW_KEY_LEFT`)
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p.gen(name)
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p.next()
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return 'int'
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}
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// enum value? (`color == .green`)
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if p.tok == .dot {
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if p.table.known_type(p.expected_type) {
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p.check_enum_member_access()
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// println("found enum value: $p.expected_type")
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return p.expected_type
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} else {
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p.error("unknown enum: `$p.expected_type`")
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}
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}
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// Variable, checked before modules, so that module shadowing is allowed:
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// `gg = gg.newcontext(); gg.draw_rect(...)`
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if p.known_var_check_new_var(name) {
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return p.get_var_type(name, ptr, deref_nr)
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}
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// Module?
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if p.peek() == .dot && (name == p.mod ||
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p.import_table.known_alias(name)) && !is_c
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{
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mut mod := name
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// must be aliased module
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if name != p.mod && p.import_table.known_alias(name) {
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p.import_table.register_used_import(name)
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mod = p.import_table.resolve_alias(name)
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}
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p.next()
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p.check(.dot)
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name = p.lit
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name = prepend_mod(mod_gen_name(mod), name)
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}
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// Unknown name, try prepending the module name to it
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// TODO perf
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else if !p.table.known_type(name) &&
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!p.table.known_fn(name) && !p.table.known_const(name) && !is_c
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{
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name = p.prepend_mod(name)
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}
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// re-check
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if p.known_var_check_new_var(name) {
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return p.get_var_type(name, ptr, deref_nr)
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}
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// if known_type || is_c_struct_init || (p.first_pass() && p.peek() == .lcbr) {
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// known type? int(4.5) or Color.green (enum)
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if p.table.known_type(name) {
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// cast expression: float(5), byte(0), (*int)(ptr) etc
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if !is_c && ( p.peek() == .lpar || (deref && p.peek() == .rpar) ) {
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if deref {
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name += '*'.repeat(deref_nr )
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}
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else if ptr {
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name += '*'.repeat(mul_nr)
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}
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p.gen('(')
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mut typ := name
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if typ in p.cur_fn.dispatch_of.inst.keys() {
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typ = p.cur_fn.dispatch_of.inst[typ]
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}
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p.cast(typ)
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p.gen(')')
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for p.tok == .dot {
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typ = p.dot(typ, ph)
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}
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return typ
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}
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// Color.green
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else if p.peek() == .dot {
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enum_type := p.table.find_type(name)
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if enum_type.cat != .enum_ {
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p.error('`$name` is not an enum')
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}
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p.next()
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p.check(.dot)
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val := p.lit
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if !enum_type.has_enum_val(val) {
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p.error('enum `$enum_type.name` does not have value `$val`')
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}
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if p.expected_type == enum_type.name {
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// `if color == .red` is enough
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// no need in `if color == Color.red`
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p.warn('`${enum_type.name}.$val` is unnecessary, use `.$val`')
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}
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// println('enum val $val')
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p.gen(mod_gen_name(enum_type.mod) + '__' + enum_type.name + '_' + val)// `color = main__Color_green`
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p.next()
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return enum_type.name
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}
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// normal struct init (non-C)
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else if p.peek() == .lcbr {
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return p.get_struct_type(name, false, ptr)
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}
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}
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// Constant
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if p.table.known_const(name) {
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return p.get_const_type(name, ptr)
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}
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// TODO: V script? Try os module.
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// Function (not method, methods are handled in `.dot()`)
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mut f := p.table.find_fn_is_script(name, p.v_script) or {
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// First pass, the function can be defined later.
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if p.first_pass() {
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p.next()
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return 'void'
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}
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// exhaused all options type,enum,const,mod,var,fn etc
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// so show undefined error (also checks typos)
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p.undefined_error(name, orig_name) return '' // panics
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}
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// no () after func, so func is an argument, just gen its name
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// TODO verify this and handle errors
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peek := p.peek()
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if peek != .lpar && peek != .lt {
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// Register anon fn type
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fn_typ := Type {
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name: f.typ_str()// 'fn (int, int) string'
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mod: p.mod
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func: f
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}
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p.table.register_type2(fn_typ)
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p.gen(p.table.fn_gen_name(f))
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p.next()
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return f.typ_str() //'void*'
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}
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// TODO bring back
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if f.typ == 'void' && !p.inside_if_expr {
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// p.error('`$f.name` used as value')
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}
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fn_call_ph := p.cgen.add_placeholder()
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// println('call to fn $f.name of type $f.typ')
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// TODO replace the following dirty hacks (needs ptr access to fn table)
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new_f := f
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p.fn_call(mut new_f, 0, '', '')
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if f.is_generic {
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f2 := p.table.find_fn(f.name) or {
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return ''
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}
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// println('after call of generic instance $new_f.name(${new_f.str_args(p.table)}) $new_f.typ')
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// println(' from $f2.name(${f2.str_args(p.table)}) $f2.typ : $f2.type_inst')
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}
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f = new_f
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// optional function call `function() or {}`, no return assignment
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is_or_else := p.tok == .key_orelse
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if p.tok == .question {
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// `files := os.ls('.')?`
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if p.cur_fn.name != 'main__main' {
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p.error('`func()?` syntax can only be used inside `fn main()` for now')
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}
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p.next()
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tmp := p.get_tmp()
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p.cgen.set_placeholder(fn_call_ph, '$f.typ $tmp = ')
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p.genln(';')
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p.genln('if (!${tmp}.ok) v_panic(${tmp}.error);')
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typ := f.typ[7..] // option_xxx
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p.gen('*($typ*) ${tmp}.data;')
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return typ
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}
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else if !p.is_var_decl && is_or_else {
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f.typ = p.gen_handle_option_or_else(f.typ, '', fn_call_ph)
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}
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else if !p.is_var_decl && !is_or_else && !p.inside_return_expr &&
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f.typ.starts_with('Option_') {
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opt_type := f.typ[7..]
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p.error('unhandled option type: `?$opt_type`')
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}
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// dot after a function call: `get_user().age`
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if p.tok == .dot {
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mut typ := ''
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for p.tok == .dot {
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// println('dot #$dc')
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typ = p.dot(f.typ, ph)
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}
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return typ
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}
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//p.log('end of name_expr')
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if f.typ.ends_with('*') {
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p.is_alloc = true
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}
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return f.typ
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}
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// returns resulting type
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fn (p mut Parser) expression() string {
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p.is_const_literal = true
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//if p.scanner.file_path.contains('test_test') {
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//println('expression() pass=$p.pass tok=')
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//p.print_tok()
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//}
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ph := p.cgen.add_placeholder()
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mut typ := p.indot_expr()
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is_str := typ=='string'
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is_ustr := typ=='ustring'
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// `a << b` ==> `array_push(&a, b)`
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if p.tok == .left_shift {
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if typ.contains('array_') {
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// Can't pass integer literal, because push requires a void*
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// a << 7 => int tmp = 7; array_push(&a, &tmp);
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// _PUSH(&a, expression(), tmp, string)
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tmp := p.get_tmp()
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tmp_typ := typ[6..]// skip "array_"
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p.check_space(.left_shift)
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// Get the value we are pushing
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p.gen(', (')
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// Immutable? Can we push?
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if !p.expr_var.is_mut && !p.pref.translated {
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p.error('`$p.expr_var.name` is immutable (can\'t <<)')
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}
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if p.expr_var.is_arg && p.expr_var.typ.starts_with('array_') {
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p.error("for now it's not possible to append an element to "+
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'a mutable array argument `$p.expr_var.name`')
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}
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if !p.expr_var.is_changed {
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p.mark_var_changed(p.expr_var)
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}
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p.gen('/*typ = $typ tmp_typ=$tmp_typ*/')
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ph_clone := p.cgen.add_placeholder()
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expr_type := p.expression()
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// Need to clone the string when appending it to an array?
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if p.pref.autofree && typ == 'array_string' && expr_type == 'string' {
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p.cgen.set_placeholder(ph_clone, 'string_clone(')
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p.gen(')')
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}
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p.gen_array_push(ph, typ, expr_type, tmp, tmp_typ)
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return 'void'
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}
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else {
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if !is_integer_type(typ) {
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p.error('cannot use shift operator on non-integer type `$typ`')
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}
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p.next()
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p.gen(' << ')
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p.check_types(p.expression(), 'integer')
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return typ
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}
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}
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if p.tok == .righ_shift {
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if !is_integer_type(typ) {
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p.error('cannot use shift operator on non-integer type `$typ`')
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}
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p.next()
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p.gen(' >> ')
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p.check_types(p.expression(), 'integer')
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return typ
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}
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// + - | ^
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for p.tok in [.plus, .minus, .pipe, .amp, .xor] {
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tok_op := p.tok
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if typ == 'bool' {
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p.error('operator ${p.tok.str()} not defined on bool ')
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}
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is_num := typ.contains('*') || is_number_type(typ)
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p.check_space(p.tok)
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if is_str && tok_op == .plus && !p.is_js {
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p.cgen.set_placeholder(ph, 'string_add(')
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p.gen(',')
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}
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else if is_ustr && tok_op == .plus {
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p.cgen.set_placeholder(ph, 'ustring_add(')
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p.gen(',')
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}
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// 3 + 4
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else if is_num || p.is_js {
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if typ == 'void*' {
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// Msvc errors on void* pointer arithmatic
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// ... So cast to byte* and then do the add
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p.cgen.set_placeholder(ph, '(byte*)')
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}else if typ.contains('*') {
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p.cgen.set_placeholder(ph, '($typ)')
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}
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p.gen(tok_op.str())
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}
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// Vec + Vec
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else {
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if p.pref.translated {
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p.gen(tok_op.str() + ' /*doom hack*/')// TODO hack to fix DOOM's angle_t
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}
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else {
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p.gen(',')
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}
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}
|
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if is_str && tok_op != .plus {
|
|
p.error('strings only support `+` operator')
|
|
}
|
|
expr_type := p.term()
|
|
if (tok_op in [.pipe, .amp, .xor]) && !(is_integer_type(expr_type) &&
|
|
is_integer_type(typ)) {
|
|
p.error('operator ${tok_op.str()} is defined only on integer types')
|
|
}
|
|
p.check_types(expr_type, typ)
|
|
if (is_str || is_ustr) && tok_op == .plus && !p.is_js {
|
|
p.gen(')')
|
|
}
|
|
// Make sure operators are used with correct types
|
|
if !p.pref.translated && !is_str && !is_ustr && !is_num {
|
|
T := p.table.find_type(typ)
|
|
if tok_op == .plus { p.handle_operator('+', typ, 'op_plus', ph, T) }
|
|
else if tok_op == .minus { p.handle_operator('-', typ, 'op_minus', ph, T) }
|
|
}
|
|
}
|
|
return typ
|
|
}
|
|
|
|
fn (p mut Parser) handle_operator(op string, typ string, cpostfix string, ph int, T &Type) {
|
|
if T.has_method( op ) {
|
|
p.cgen.set_placeholder(ph, '${typ}_${cpostfix}(')
|
|
p.gen(')')
|
|
}
|
|
else {
|
|
p.error('operator $op not defined on `$typ`')
|
|
}
|
|
}
|
|
|
|
fn (p mut Parser) term() string {
|
|
line_nr := p.scanner.line_nr
|
|
//if p.fileis('fn_test') {
|
|
//println('\nterm() $line_nr')
|
|
//}
|
|
ph := p.cgen.add_placeholder()
|
|
typ := p.unary()
|
|
//if p.fileis('fn_test') {
|
|
//println('2: $line_nr')
|
|
//}
|
|
// `*` on a newline? Can't be multiplication, only dereference
|
|
if p.tok == .mul && line_nr != p.scanner.line_nr {
|
|
return typ
|
|
}
|
|
for p.tok == .mul || p.tok == .div || p.tok == .mod {
|
|
tok := p.tok
|
|
is_mul := tok == .mul
|
|
is_div := tok == .div
|
|
is_mod := tok == .mod
|
|
p.fspace()
|
|
p.next()
|
|
p.gen(tok.str())// + ' /*op2*/ ')
|
|
oph := p.cgen.add_placeholder()
|
|
p.fspace()
|
|
if (is_div || is_mod) && p.tok == .number && p.lit == '0' {
|
|
p.error('division or modulo by zero')
|
|
}
|
|
expr_type := p.unary()
|
|
if (is_mul || is_div) && expr_type == 'string' {
|
|
p.error('operator ${tok.str()} cannot be used on strings')
|
|
}
|
|
if !is_primitive_type(expr_type) && expr_type == typ {
|
|
p.check_types(expr_type, typ)
|
|
T := p.table.find_type(typ)
|
|
// NB: oph is a char index just after the OP
|
|
before_oph := p.cgen.cur_line[..oph-1]
|
|
after_oph := p.cgen.cur_line[oph..]
|
|
p.cgen.cur_line = before_oph + ',' + after_oph
|
|
match tok {
|
|
.mul { p.handle_operator('*', typ, 'op_mul', ph, T) }
|
|
.div { p.handle_operator('/', typ, 'op_div', ph, T) }
|
|
.mod { p.handle_operator('%', typ, 'op_mod', ph, T) }
|
|
}
|
|
continue
|
|
}
|
|
|
|
if is_mod {
|
|
if !(is_integer_type(expr_type) && is_integer_type(typ)) {
|
|
p.error('operator `mod` requires integer types')
|
|
}
|
|
} else {
|
|
p.check_types(expr_type, typ)
|
|
}
|
|
}
|
|
return typ
|
|
}
|
|
|
|
fn (p mut Parser) unary() string {
|
|
mut typ := ''
|
|
tok := p.tok
|
|
match tok {
|
|
.not {
|
|
p.gen('!')
|
|
p.check(.not)
|
|
// typ should be bool type
|
|
typ = p.indot_expr()
|
|
if typ != 'bool' {
|
|
p.error('operator ! requires bool type, not `$typ`')
|
|
}
|
|
}
|
|
.bit_not {
|
|
p.gen('~')
|
|
p.check(.bit_not)
|
|
typ = p.bool_expression()
|
|
}
|
|
else {
|
|
typ = p.factor()
|
|
}
|
|
}
|
|
return typ
|
|
}
|
|
|
|
fn (p mut Parser) factor() string {
|
|
mut typ := ''
|
|
tok := p.tok
|
|
match tok {
|
|
.key_none {
|
|
if !p.expected_type.starts_with('Option_') {
|
|
p.error('need "$p.expected_type" got none')
|
|
}
|
|
p.gen('opt_none()')
|
|
p.check(.key_none)
|
|
return p.expected_type
|
|
}
|
|
.number {
|
|
typ = 'int'
|
|
// Check if float (`1.0`, `1e+3`) but not if is hexa
|
|
if (p.lit.contains('.') || (p.lit.contains('e') || p.lit.contains('E'))) &&
|
|
!(p.lit[0] == `0` && (p.lit[1] == `x` || p.lit[1] == `X`)) {
|
|
typ = 'f32'
|
|
// typ = 'f64' // TODO
|
|
} else {
|
|
v_u64 := p.lit.u64()
|
|
if u64(u32(v_u64)) < v_u64 {
|
|
typ = 'u64'
|
|
}
|
|
}
|
|
if p.expected_type != '' && !is_valid_int_const(p.lit, p.expected_type) {
|
|
p.error('constant `$p.lit` overflows `$p.expected_type`')
|
|
}
|
|
p.gen(p.lit)
|
|
}
|
|
.minus {
|
|
p.gen('-')
|
|
p.next()
|
|
return p.factor()
|
|
// Variable
|
|
}
|
|
.key_sizeof {
|
|
p.gen('sizeof(')
|
|
p.fgen('sizeof(')
|
|
p.next()
|
|
p.check(.lpar)
|
|
mut sizeof_typ := p.get_type()
|
|
p.check(.rpar)
|
|
p.gen('$sizeof_typ)')
|
|
p.fgen('$sizeof_typ)')
|
|
return 'int'
|
|
}
|
|
.amp, .dot, .mul {
|
|
// (dot is for enum vals: `.green`)
|
|
return p.name_expr()
|
|
}
|
|
.name {
|
|
// map[string]int
|
|
if p.lit == 'map' && p.peek() == .lsbr {
|
|
return p.map_init()
|
|
}
|
|
if p.lit == 'json' && p.peek() == .dot {
|
|
if !('json' in p.table.imports) {
|
|
p.error('undefined: `json`, use `import json`')
|
|
}
|
|
p.import_table.register_used_import('json')
|
|
return p.js_decode()
|
|
}
|
|
//if p.fileis('orm_test') {
|
|
//println('ORM name: $p.lit')
|
|
//}
|
|
typ = p.name_expr()
|
|
return typ
|
|
}
|
|
/*
|
|
.key_default {
|
|
p.next()
|
|
p.next()
|
|
name := p.check_name()
|
|
if name != 'T' {
|
|
p.error('default needs T')
|
|
}
|
|
p.gen('default(T)')
|
|
p.next()
|
|
return 'T'
|
|
}
|
|
*/
|
|
.lpar {
|
|
//p.gen('(/*lpar*/')
|
|
p.gen('(')
|
|
p.check(.lpar)
|
|
typ = p.bool_expression()
|
|
// Hack. If this `)` referes to a ptr cast `(*int__)__`, it was already checked
|
|
// TODO: fix parser so that it doesn't think it's a par expression when it sees `(` in
|
|
// __(__*int)(
|
|
if !p.ptr_cast {
|
|
p.check(.rpar)
|
|
}
|
|
p.ptr_cast = false
|
|
p.gen(')')
|
|
return typ
|
|
}
|
|
.chartoken {
|
|
p.char_expr()
|
|
typ = 'byte'
|
|
return typ
|
|
}
|
|
.str {
|
|
p.string_expr()
|
|
typ = 'string'
|
|
return typ
|
|
}
|
|
.key_false {
|
|
typ = 'bool'
|
|
p.gen('0')
|
|
}
|
|
.key_true {
|
|
typ = 'bool'
|
|
p.gen('1')
|
|
}
|
|
.lsbr {
|
|
// `[1,2,3]` or `[]` or `[20]byte`
|
|
// TODO have to return because arrayInit does next()
|
|
// everything should do next()
|
|
return p.array_init()
|
|
}
|
|
.lcbr {
|
|
// `m := { 'one': 1 }`
|
|
if p.peek() == .str {
|
|
return p.map_init()
|
|
}
|
|
// { user | name :'new name' }
|
|
return p.assoc()
|
|
}
|
|
.key_if {
|
|
typ = p.if_st(true, 0)
|
|
return typ
|
|
}
|
|
.key_match {
|
|
typ = p.match_statement(true)
|
|
return typ
|
|
}
|
|
else {
|
|
if p.pref.is_verbose || p.pref.is_debug {
|
|
next := p.peek()
|
|
println('prev=${p.prev_tok.str()}')
|
|
println('next=${next.str()}')
|
|
}
|
|
p.error('unexpected token: `${p.tok.str()}`')
|
|
}
|
|
}
|
|
p.next()// TODO everything should next()
|
|
return typ
|
|
}
|
|
|
|
// { user | name: 'new name' }
|