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defer statement

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This commit is contained in:
Alexander Medvednikov 2019-07-15 22:09:34 +02:00
parent d58174e77f
commit 17c6ba04a2
3 changed files with 24 additions and 6 deletions
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20
compiler/parser.v
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@ -1022,6 +1022,9 @@ fn (p mut Parser) statement(add_semi bool) string {
label := p.check_name()
p.genln('goto $label;')
return ''
case Token.key_defer:
p.defer_st()
return ''
case Token.hash:
p.chash()
return ''
@ -1038,7 +1041,7 @@ fn (p mut Parser) statement(add_semi bool) string {
case Token.key_return:
p.return_st()
case Token.lcbr:// {} block
p.next()
p.check(.lcbr)
p.genln('{')
p.statements()
return ''
@ -3088,7 +3091,7 @@ else {
}
fn (p mut Parser) return_st() {
p.cgen.insert_before(p.cur_fn.defer)
p.cgen.insert_before(p.cur_fn.defer_text)
p.check(.key_return)
fn_returns := p.cur_fn.typ != 'void'
@ -3265,6 +3268,19 @@ fn (p mut Parser) attribute() {
p.error('bad attribute usage')
}
fn (p mut Parser) defer_st() {
p.check(.key_defer)
// Wrap everything inside the defer block in /**/ comments, and save it in
// `defer_text`. It will be inserted before every `return`.
p.genln('/*')
pos := p.cgen.lines.len
p.check(.lcbr)
p.genln('{')
p.statements()
p.cur_fn.defer_text = p.cgen.lines.right(pos).join('\n')
p.genln('*/')
}
///////////////////////////////////////////////////////////////////////////////