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cgen: minor perf fix in index_expr() (#9054)

pull/9057/head
yuyi 2021-03-02 19:28:26 +08:00 committed by GitHub
parent 31321b68ea
commit 62ccd740f0
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 421 additions and 402 deletions
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402
vlib/v/gen/c/cgen.v
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@ -4224,408 +4224,6 @@ fn (mut g Gen) if_expr(node ast.IfExpr) {
}
}
fn (mut g Gen) index_expr(node ast.IndexExpr) {
gen_or := node.or_expr.kind != .absent
match node.index {
ast.RangeExpr {
sym := g.table.get_type_symbol(node.left_type)
if sym.kind == .string {
g.write('string_substr(')
g.expr(node.left)
} else if sym.kind == .array {
g.write('array_slice(')
if node.left_type.is_ptr() {
g.write('*')
}
g.expr(node.left)
} else if sym.kind == .array_fixed {
// Convert a fixed array to V array when doing `fixed_arr[start..end]`
info := sym.info as table.ArrayFixed
g.write('array_slice(new_array_from_c_array(')
g.write('$info.size')
g.write(', $info.size')
g.write(', sizeof(')
if node.left_type.is_ptr() {
g.write('(*')
}
g.expr(node.left)
if node.left_type.is_ptr() {
g.write(')')
}
g.write('[0]), ')
if node.left_type.is_ptr() {
g.write('*')
}
g.expr(node.left)
g.write(')')
} else {
g.expr(node.left)
}
g.write(', ')
if node.index.has_low {
g.expr(node.index.low)
} else {
g.write('0')
}
g.write(', ')
if node.index.has_high {
g.expr(node.index.high)
} else if sym.kind == .array_fixed {
info := sym.info as table.ArrayFixed
g.write('$info.size')
} else if node.left_type.is_ptr() {
g.write('(')
g.write('*')
g.expr(node.left)
g.write(')')
g.write('.len')
} else {
g.expr(node.left)
g.write('.len')
}
g.write(')')
}
else {
// indexing
sym := g.table.get_final_type_symbol(node.left_type)
left_is_ptr := node.left_type.is_ptr()
if sym.kind == .array {
info := sym.info as table.Array
elem_type_str := g.typ(info.elem_type)
elem_type := info.elem_type
elem_typ := g.table.get_type_symbol(elem_type)
// `vals[i].field = x` is an exception and requires `array_get`:
// `(*(Val*)array_get(vals, i)).field = x;`
is_selector := node.left is ast.SelectorExpr
if g.is_assign_lhs && !is_selector && node.is_setter {
is_direct_array_access := g.fn_decl != 0 && g.fn_decl.is_direct_arr
is_op_assign := g.assign_op != .assign && info.elem_type != table.string_type
array_ptr_type_str := match elem_typ.kind {
.function { 'voidptr*' }
else { '$elem_type_str*' }
}
if is_direct_array_access {
g.write('(($array_ptr_type_str)')
} else if is_op_assign {
g.write('(*($array_ptr_type_str)array_get(')
if left_is_ptr && !node.left_type.has_flag(.shared_f) {
g.write('*')
}
} else {
g.is_array_set = true // special handling of assign_op and closing with '})'
g.write('array_set(')
if !left_is_ptr || node.left_type.has_flag(.shared_f) {
g.write('&')
}
}
g.expr(node.left)
if node.left_type.has_flag(.shared_f) {
if left_is_ptr {
g.write('->val')
} else {
g.write('.val')
}
}
if is_direct_array_access {
if left_is_ptr && !node.left_type.has_flag(.shared_f) {
g.write('->')
} else {
g.write('.')
}
g.write('data)[')
g.expr(node.index)
g.write(']')
} else {
g.write(', ')
g.expr(node.index)
if !is_op_assign {
mut need_wrapper := true
/*
match node.right {
ast.EnumVal, ast.Ident {
// `&x` is enough for variables and enums
// `&(Foo[]){ ... }` is only needed for function calls and literals
need_wrapper = false
}
else {}
}
*/
if need_wrapper {
if elem_typ.kind == .function {
g.write(', &(voidptr[]) { ')
} else {
g.write(', &($elem_type_str[]) { ')
}
} else {
g.write(', &')
}
} else {
// `x[0] *= y`
g.write('))')
}
}
} else {
is_direct_array_access := g.fn_decl != 0 && g.fn_decl.is_direct_arr
array_ptr_type_str := match elem_typ.kind {
.function { 'voidptr*' }
else { '$elem_type_str*' }
}
needs_clone := info.elem_type == table.string_type_idx && g.is_autofree
&& !g.is_assign_lhs
is_gen_or_and_assign_rhs := gen_or && !g.discard_or_result
cur_line := if is_gen_or_and_assign_rhs {
line := g.go_before_stmt(0)
g.out.write_string(c.tabs[g.indent])
line
} else {
''
}
tmp_opt := if gen_or { g.new_tmp_var() } else { '' }
tmp_opt_ptr := if gen_or { g.new_tmp_var() } else { '' }
if gen_or {
g.write('$array_ptr_type_str $tmp_opt_ptr = ($array_ptr_type_str)/*ee elem_ptr_typ */(array_get_with_check(')
} else {
if needs_clone {
g.write('/*2*/string_clone(')
}
if g.is_fn_index_call {
if elem_typ.info is table.FnType {
g.write('((')
g.write_fn_ptr_decl(&elem_typ.info, '')
g.write(')(*($array_ptr_type_str)/*ee elem_typ */array_get(')
}
if left_is_ptr && !node.left_type.has_flag(.shared_f) {
g.write('*')
}
} else if is_direct_array_access {
g.write('(($array_ptr_type_str)')
} else {
g.write('(*($array_ptr_type_str)/*ee elem_typ */array_get(')
if left_is_ptr && !node.left_type.has_flag(.shared_f) {
g.write('*')
}
}
}
g.expr(node.left)
// TODO: test direct_array_access when 'shared' is implemented
if node.left_type.has_flag(.shared_f) {
if left_is_ptr {
g.write('->val')
} else {
g.write('.val')
}
}
if is_direct_array_access && !gen_or {
if left_is_ptr && !node.left_type.has_flag(.shared_f) {
g.write('->')
} else {
g.write('.')
}
g.write('data)[')
g.expr(node.index)
g.write(']')
} else {
g.write(', ')
g.expr(node.index)
if g.is_fn_index_call {
g.write(')))')
} else {
g.write('))')
}
}
if needs_clone {
g.write(')')
}
if gen_or {
g.writeln(';')
opt_elem_type := g.typ(elem_type.set_flag(.optional))
g.writeln('$opt_elem_type $tmp_opt = {0};')
g.writeln('if ($tmp_opt_ptr) {')
g.writeln('\t*(($elem_type_str*)&${tmp_opt}.data) = *(($elem_type_str*)$tmp_opt_ptr);')
g.writeln('} else {')
g.writeln('\t${tmp_opt}.state = 2; ${tmp_opt}.err = (Error){.msg=_SLIT("array index out of range"), .code=0};')
g.writeln('}')
g.or_block(tmp_opt, node.or_expr, elem_type)
g.write('\n$cur_line*($elem_type_str*)${tmp_opt}.data')
}
}
} else if sym.kind == .array_fixed {
info := sym.info as table.ArrayFixed
elem_type := info.elem_type
elem_sym := g.table.get_type_symbol(elem_type)
is_fn_index_call := g.is_fn_index_call && elem_sym.info is table.FnType
if is_fn_index_call {
g.write('(*')
}
if node.left_type.is_ptr() {
g.write('(*')
g.expr(node.left)
g.write(')')
} else {
g.expr(node.left)
}
g.write('[')
direct := g.fn_decl != 0 && g.fn_decl.is_direct_arr
if direct || node.index is ast.IntegerLiteral {
g.expr(node.index)
} else {
// bounds check
g.write('v_fixed_index(')
g.expr(node.index)
g.write(', $info.size)')
}
g.write(']')
if is_fn_index_call {
g.write(')')
}
} else if sym.kind == .map {
info := sym.info as table.Map
key_type_str := g.typ(info.key_type)
elem_type := info.value_type
elem_type_str := g.typ(elem_type)
elem_typ := g.table.get_type_symbol(elem_type)
get_and_set_types := elem_typ.kind in [.struct_, .map]
if g.is_assign_lhs && !g.is_array_set && !get_and_set_types {
if g.assign_op == .assign || info.value_type == table.string_type {
g.is_array_set = true
g.write('map_set_1(')
} else {
if node.is_setter {
g.write('(*(($elem_type_str*)map_get_and_set_1(')
} else {
g.write('(*(($elem_type_str*)map_get_1(')
}
}
if !left_is_ptr || node.left_type.has_flag(.shared_f) {
g.write('&')
}
if node.left is ast.IndexExpr {
g.inside_map_index = true
g.expr(node.left)
g.inside_map_index = false
} else {
g.expr(node.left)
}
if node.left_type.has_flag(.shared_f) {
if left_is_ptr {
g.write('->val')
} else {
g.write('.val')
}
}
g.write(', &($key_type_str[]){')
g.expr(node.index)
g.write('}')
if elem_typ.kind == .function {
g.write(', &(voidptr[]) { ')
} else {
g.array_set_pos = g.out.len
g.write(', &($elem_type_str[]) { ')
}
if g.assign_op != .assign && info.value_type != table.string_type {
zero := g.type_default(info.value_type)
g.write('$zero })))')
}
} else if g.inside_map_postfix || g.inside_map_infix
|| g.inside_map_index
|| (g.is_assign_lhs && !g.is_array_set && get_and_set_types) {
zero := g.type_default(info.value_type)
if node.is_setter {
g.write('(*($elem_type_str*)map_get_and_set_1(')
} else {
g.write('(*($elem_type_str*)map_get_1(')
}
if !left_is_ptr {
g.write('&')
}
g.expr(node.left)
g.write(', &($key_type_str[]){')
g.expr(node.index)
g.write('}, &($elem_type_str[]){ $zero }))')
} else {
zero := g.type_default(info.value_type)
is_gen_or_and_assign_rhs := gen_or && !g.discard_or_result
cur_line := if is_gen_or_and_assign_rhs {
line := g.go_before_stmt(0)
g.out.write_string(c.tabs[g.indent])
line
} else {
''
}
tmp_opt := if gen_or { g.new_tmp_var() } else { '' }
tmp_opt_ptr := if gen_or { g.new_tmp_var() } else { '' }
if gen_or {
g.write('$elem_type_str* $tmp_opt_ptr = ($elem_type_str*)/*ee elem_ptr_typ */(map_get_1_check(')
} else {
if g.is_fn_index_call {
if elem_typ.info is table.FnType {
g.write('((')
g.write_fn_ptr_decl(&elem_typ.info, '')
g.write(')(*(voidptr*)map_get_1(')
}
} else if elem_typ.kind == .function {
g.write('(*(voidptr*)map_get_1(')
} else {
g.write('(*($elem_type_str*)map_get_1(')
}
}
if !left_is_ptr || node.left_type.has_flag(.shared_f) {
g.write('ADDR(map, ')
g.expr(node.left)
} else {
g.write('(')
g.expr(node.left)
}
if node.left_type.has_flag(.shared_f) {
if left_is_ptr {
g.write('->val')
} else {
g.write('.val')
}
}
g.write('), &($key_type_str[]){')
g.expr(node.index)
g.write('}')
if gen_or {
g.write('))')
} else if g.is_fn_index_call {
g.write(', &(voidptr[]){ $zero })))')
} else if elem_typ.kind == .function {
g.write(', &(voidptr[]){ $zero }))')
} else {
g.write(', &($elem_type_str[]){ $zero }))')
}
if gen_or {
g.writeln(';')
opt_elem_type := g.typ(elem_type.set_flag(.optional))
g.writeln('$opt_elem_type $tmp_opt = {0};')
g.writeln('if ($tmp_opt_ptr) {')
g.writeln('\t*(($elem_type_str*)&${tmp_opt}.data) = *(($elem_type_str*)$tmp_opt_ptr);')
g.writeln('} else {')
g.writeln('\t${tmp_opt}.state = 2; ${tmp_opt}.err = (Error){.msg=_SLIT("array index out of range"), .code=0};')
g.writeln('}')
g.or_block(tmp_opt, node.or_expr, elem_type)
g.write('\n$cur_line*($elem_type_str*)${tmp_opt}.data')
}
}
} else if sym.kind == .string && !node.left_type.is_ptr() {
g.write('string_at(')
g.expr(node.left)
g.write(', ')
g.expr(node.index)
g.write(')')
} else {
g.expr(node.left)
g.write('[')
g.expr(node.index)
g.write(']')
}
}
}
}
[inline]
fn (g &Gen) expr_is_multi_return_call(expr ast.Expr) bool {
match expr {

421
vlib/v/gen/c/index.v 100644
View File

@ -0,0 +1,421 @@
// Copyright (c) 2019-2021 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 c
import v.ast
import v.table
fn (mut g Gen) index_expr(node ast.IndexExpr) {
if node.index is ast.RangeExpr {
g.range_expr(node, node.index)
} else {
sym := g.table.get_final_type_symbol(node.left_type)
if sym.kind == .array {
g.index_of_array(node, sym)
} else if sym.kind == .array_fixed {
g.index_of_fixed_array(node, sym)
} else if sym.kind == .map {
g.index_of_map(node, sym)
} else if sym.kind == .string && !node.left_type.is_ptr() {
g.write('string_at(')
g.expr(node.left)
g.write(', ')
g.expr(node.index)
g.write(')')
} else {
g.expr(node.left)
g.write('[')
g.expr(node.index)
g.write(']')
}
}
}
fn (mut g Gen) range_expr(node ast.IndexExpr, range ast.RangeExpr) {
sym := g.table.get_type_symbol(node.left_type)
if sym.kind == .string {
g.write('string_substr(')
g.expr(node.left)
} else if sym.kind == .array {
g.write('array_slice(')
if node.left_type.is_ptr() {
g.write('*')
}
g.expr(node.left)
} else if sym.kind == .array_fixed {
// Convert a fixed array to V array when doing `fixed_arr[start..end]`
info := sym.info as table.ArrayFixed
g.write('array_slice(new_array_from_c_array(')
g.write('$info.size')
g.write(', $info.size')
g.write(', sizeof(')
if node.left_type.is_ptr() {
g.write('(*')
}
g.expr(node.left)
if node.left_type.is_ptr() {
g.write(')')
}
g.write('[0]), ')
if node.left_type.is_ptr() {
g.write('*')
}
g.expr(node.left)
g.write(')')
} else {
g.expr(node.left)
}
g.write(', ')
if range.has_low {
g.expr(range.low)
} else {
g.write('0')
}
g.write(', ')
if range.has_high {
g.expr(range.high)
} else if sym.kind == .array_fixed {
info := sym.info as table.ArrayFixed
g.write('$info.size')
} else if node.left_type.is_ptr() {
g.write('(')
g.write('*')
g.expr(node.left)
g.write(')')
g.write('.len')
} else {
g.expr(node.left)
g.write('.len')
}
g.write(')')
}
fn (mut g Gen) index_of_array(node ast.IndexExpr, sym table.TypeSymbol) {
gen_or := node.or_expr.kind != .absent
left_is_ptr := node.left_type.is_ptr()
info := sym.info as table.Array
elem_type_str := g.typ(info.elem_type)
elem_type := info.elem_type
elem_typ := g.table.get_type_symbol(elem_type)
// `vals[i].field = x` is an exception and requires `array_get`:
// `(*(Val*)array_get(vals, i)).field = x;`
is_selector := node.left is ast.SelectorExpr
if g.is_assign_lhs && !is_selector && node.is_setter {
is_direct_array_access := g.fn_decl != 0 && g.fn_decl.is_direct_arr
is_op_assign := g.assign_op != .assign && info.elem_type != table.string_type
array_ptr_type_str := match elem_typ.kind {
.function { 'voidptr*' }
else { '$elem_type_str*' }
}
if is_direct_array_access {
g.write('(($array_ptr_type_str)')
} else if is_op_assign {
g.write('(*($array_ptr_type_str)array_get(')
if left_is_ptr && !node.left_type.has_flag(.shared_f) {
g.write('*')
}
} else {
g.is_array_set = true // special handling of assign_op and closing with '})'
g.write('array_set(')
if !left_is_ptr || node.left_type.has_flag(.shared_f) {
g.write('&')
}
}
g.expr(node.left)
if node.left_type.has_flag(.shared_f) {
if left_is_ptr {
g.write('->val')
} else {
g.write('.val')
}
}
if is_direct_array_access {
if left_is_ptr && !node.left_type.has_flag(.shared_f) {
g.write('->')
} else {
g.write('.')
}
g.write('data)[')
g.expr(node.index)
g.write(']')
} else {
g.write(', ')
g.expr(node.index)
if !is_op_assign {
mut need_wrapper := true
/*
match node.right {
ast.EnumVal, ast.Ident {
// `&x` is enough for variables and enums
// `&(Foo[]){ ... }` is only needed for function calls and literals
need_wrapper = false
}
else {}
}
*/
if need_wrapper {
if elem_typ.kind == .function {
g.write(', &(voidptr[]) { ')
} else {
g.write(', &($elem_type_str[]) { ')
}
} else {
g.write(', &')
}
} else {
// `x[0] *= y`
g.write('))')
}
}
} else {
is_direct_array_access := g.fn_decl != 0 && g.fn_decl.is_direct_arr
array_ptr_type_str := match elem_typ.kind {
.function { 'voidptr*' }
else { '$elem_type_str*' }
}
needs_clone := info.elem_type == table.string_type_idx && g.is_autofree && !g.is_assign_lhs
is_gen_or_and_assign_rhs := gen_or && !g.discard_or_result
cur_line := if is_gen_or_and_assign_rhs {
line := g.go_before_stmt(0)
g.out.write_string(tabs[g.indent])
line
} else {
''
}
tmp_opt := if gen_or { g.new_tmp_var() } else { '' }
tmp_opt_ptr := if gen_or { g.new_tmp_var() } else { '' }
if gen_or {
g.write('$array_ptr_type_str $tmp_opt_ptr = ($array_ptr_type_str)/*ee elem_ptr_typ */(array_get_with_check(')
} else {
if needs_clone {
g.write('/*2*/string_clone(')
}
if g.is_fn_index_call {
if elem_typ.info is table.FnType {
g.write('((')
g.write_fn_ptr_decl(&elem_typ.info, '')
g.write(')(*($array_ptr_type_str)/*ee elem_typ */array_get(')
}
if left_is_ptr && !node.left_type.has_flag(.shared_f) {
g.write('*')
}
} else if is_direct_array_access {
g.write('(($array_ptr_type_str)')
} else {
g.write('(*($array_ptr_type_str)/*ee elem_typ */array_get(')
if left_is_ptr && !node.left_type.has_flag(.shared_f) {
g.write('*')
}
}
}
g.expr(node.left)
// TODO: test direct_array_access when 'shared' is implemented
if node.left_type.has_flag(.shared_f) {
if left_is_ptr {
g.write('->val')
} else {
g.write('.val')
}
}
if is_direct_array_access && !gen_or {
if left_is_ptr && !node.left_type.has_flag(.shared_f) {
g.write('->')
} else {
g.write('.')
}
g.write('data)[')
g.expr(node.index)
g.write(']')
} else {
g.write(', ')
g.expr(node.index)
if g.is_fn_index_call {
g.write(')))')
} else {
g.write('))')
}
}
if needs_clone {
g.write(')')
}
if gen_or {
g.writeln(';')
opt_elem_type := g.typ(elem_type.set_flag(.optional))
g.writeln('$opt_elem_type $tmp_opt = {0};')
g.writeln('if ($tmp_opt_ptr) {')
g.writeln('\t*(($elem_type_str*)&${tmp_opt}.data) = *(($elem_type_str*)$tmp_opt_ptr);')
g.writeln('} else {')
g.writeln('\t${tmp_opt}.state = 2; ${tmp_opt}.err = (Error){.msg=_SLIT("array index out of range"), .code=0};')
g.writeln('}')
g.or_block(tmp_opt, node.or_expr, elem_type)
g.write('\n$cur_line*($elem_type_str*)${tmp_opt}.data')
}
}
}
fn (mut g Gen) index_of_fixed_array(node ast.IndexExpr, sym table.TypeSymbol) {
info := sym.info as table.ArrayFixed
elem_type := info.elem_type
elem_sym := g.table.get_type_symbol(elem_type)
is_fn_index_call := g.is_fn_index_call && elem_sym.info is table.FnType
if is_fn_index_call {
g.write('(*')
}
if node.left_type.is_ptr() {
g.write('(*')
g.expr(node.left)
g.write(')')
} else {
g.expr(node.left)
}
g.write('[')
direct := g.fn_decl != 0 && g.fn_decl.is_direct_arr
if direct || node.index is ast.IntegerLiteral {
g.expr(node.index)
} else {
// bounds check
g.write('v_fixed_index(')
g.expr(node.index)
g.write(', $info.size)')
}
g.write(']')
if is_fn_index_call {
g.write(')')
}
}
fn (mut g Gen) index_of_map(node ast.IndexExpr, sym table.TypeSymbol) {
gen_or := node.or_expr.kind != .absent
left_is_ptr := node.left_type.is_ptr()
info := sym.info as table.Map
key_type_str := g.typ(info.key_type)
elem_type := info.value_type
elem_type_str := g.typ(elem_type)
elem_typ := g.table.get_type_symbol(elem_type)
get_and_set_types := elem_typ.kind in [.struct_, .map]
if g.is_assign_lhs && !g.is_array_set && !get_and_set_types {
if g.assign_op == .assign || info.value_type == table.string_type {
g.is_array_set = true
g.write('map_set_1(')
} else {
if node.is_setter {
g.write('(*(($elem_type_str*)map_get_and_set_1(')
} else {
g.write('(*(($elem_type_str*)map_get_1(')
}
}
if !left_is_ptr || node.left_type.has_flag(.shared_f) {
g.write('&')
}
if node.left is ast.IndexExpr {
g.inside_map_index = true
g.expr(node.left)
g.inside_map_index = false
} else {
g.expr(node.left)
}
if node.left_type.has_flag(.shared_f) {
if left_is_ptr {
g.write('->val')
} else {
g.write('.val')
}
}
g.write(', &($key_type_str[]){')
g.expr(node.index)
g.write('}')
if elem_typ.kind == .function {
g.write(', &(voidptr[]) { ')
} else {
g.array_set_pos = g.out.len
g.write(', &($elem_type_str[]) { ')
}
if g.assign_op != .assign && info.value_type != table.string_type {
zero := g.type_default(info.value_type)
g.write('$zero })))')
}
} else if g.inside_map_postfix || g.inside_map_infix || g.inside_map_index
|| (g.is_assign_lhs && !g.is_array_set && get_and_set_types) {
zero := g.type_default(info.value_type)
if node.is_setter {
g.write('(*($elem_type_str*)map_get_and_set_1(')
} else {
g.write('(*($elem_type_str*)map_get_1(')
}
if !left_is_ptr {
g.write('&')
}
g.expr(node.left)
g.write(', &($key_type_str[]){')
g.expr(node.index)
g.write('}, &($elem_type_str[]){ $zero }))')
} else {
zero := g.type_default(info.value_type)
is_gen_or_and_assign_rhs := gen_or && !g.discard_or_result
cur_line := if is_gen_or_and_assign_rhs {
line := g.go_before_stmt(0)
g.out.write_string(tabs[g.indent])
line
} else {
''
}
tmp_opt := if gen_or { g.new_tmp_var() } else { '' }
tmp_opt_ptr := if gen_or { g.new_tmp_var() } else { '' }
if gen_or {
g.write('$elem_type_str* $tmp_opt_ptr = ($elem_type_str*)/*ee elem_ptr_typ */(map_get_1_check(')
} else {
if g.is_fn_index_call {
if elem_typ.info is table.FnType {
g.write('((')
g.write_fn_ptr_decl(&elem_typ.info, '')
g.write(')(*(voidptr*)map_get_1(')
}
} else if elem_typ.kind == .function {
g.write('(*(voidptr*)map_get_1(')
} else {
g.write('(*($elem_type_str*)map_get_1(')
}
}
if !left_is_ptr || node.left_type.has_flag(.shared_f) {
g.write('ADDR(map, ')
g.expr(node.left)
} else {
g.write('(')
g.expr(node.left)
}
if node.left_type.has_flag(.shared_f) {
if left_is_ptr {
g.write('->val')
} else {
g.write('.val')
}
}
g.write('), &($key_type_str[]){')
g.expr(node.index)
g.write('}')
if gen_or {
g.write('))')
} else if g.is_fn_index_call {
g.write(', &(voidptr[]){ $zero })))')
} else if elem_typ.kind == .function {
g.write(', &(voidptr[]){ $zero }))')
} else {
g.write(', &($elem_type_str[]){ $zero }))')
}
if gen_or {
g.writeln(';')
opt_elem_type := g.typ(elem_type.set_flag(.optional))
g.writeln('$opt_elem_type $tmp_opt = {0};')
g.writeln('if ($tmp_opt_ptr) {')
g.writeln('\t*(($elem_type_str*)&${tmp_opt}.data) = *(($elem_type_str*)$tmp_opt_ptr);')
g.writeln('} else {')
g.writeln('\t${tmp_opt}.state = 2; ${tmp_opt}.err = (Error){.msg=_SLIT("array index out of range"), .code=0};')
g.writeln('}')
g.or_block(tmp_opt, node.or_expr, elem_type)
g.write('\n$cur_line*($elem_type_str*)${tmp_opt}.data')
}
}
}