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checker: simplify noreturn.v

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Delyan Angelov 2021-09-18 13:42:46 +03:00
parent 396eede4db
commit 0a7fb34613
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1 changed files with 24 additions and 23 deletions
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47
vlib/v/checker/noreturn.v
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@ -9,38 +9,39 @@ fn (mut c Checker) check_noreturn_fn_decl(mut node ast.FnDecl) {
if node.no_body {
return
}
if node.return_type != ast.void_type {
c.error('[noreturn] functions cannot have return types', node.pos)
}
if uses_return_stmt(node.stmts) {
c.error('[noreturn] functions cannot use return statements', node.pos)
}
if node.return_type != ast.void_type {
c.error('[noreturn] functions cannot have return types', node.pos)
} else {
if node.stmts.len != 0 {
mut is_valid_end_of_noreturn_fn := false
last_stmt := node.stmts.last()
match last_stmt {
ast.ExprStmt {
if last_stmt.expr is ast.CallExpr {
if last_stmt.expr.should_be_skipped {
c.error('[noreturn] functions cannot end with a skippable `[if ..]` call',
last_stmt.pos)
}
if last_stmt.expr.is_noreturn {
is_valid_end_of_noreturn_fn = true
}
if node.stmts.len != 0 {
mut is_valid_end_of_noreturn_fn := false
last_stmt := node.stmts.last()
match last_stmt {
ast.ExprStmt {
if last_stmt.expr is ast.CallExpr {
if last_stmt.expr.should_be_skipped {
c.error('[noreturn] functions cannot end with a skippable `[if ..]` call',
last_stmt.pos)
return
}
}
ast.ForStmt {
if last_stmt.is_inf && last_stmt.stmts.len == 0 {
if last_stmt.expr.is_noreturn {
is_valid_end_of_noreturn_fn = true
}
}
else {}
}
if !is_valid_end_of_noreturn_fn {
c.error('[noreturn] functions should end with a call to another [noreturn] function, or with an infinite `for {}` loop',
last_stmt.pos)
ast.ForStmt {
if last_stmt.is_inf && last_stmt.stmts.len == 0 {
is_valid_end_of_noreturn_fn = true
}
}
else {}
}
if !is_valid_end_of_noreturn_fn {
c.error('[noreturn] functions should end with a call to another [noreturn] function, or with an infinite `for {}` loop',
last_stmt.pos)
return
}
}
}