bjoernager/rust
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Implement "claim"

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Implement "claim" (issue #14), which is a version of "check" that
doesn't really do the check at runtime. It's an unsafe feature.

The new flag --check-claims turns claims into checks automatically --
but it's off by default, so by default, the assertion in a claim
doesn't execute at runtime.
This commit is contained in:
Tim Chevalier 2011-06-28 16:29:37 -07:00
parent 866ee6ecb4
commit 9f1444c701
15 changed files with 79 additions and 15 deletions
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17
src/comp/front/parser.rs
View file

@ -865,7 +865,20 @@ fn parse_bottom_expr(&parser p) -> @ast::expr {
auto e = parse_expr(p);
auto hi = e.span.hi;
ex = ast::expr_check(e);
ex = ast::expr_check(ast::checked, e);
} else if (eat_word(p, "claim")) {
/* Same rules as check, except that if check-claims
is enabled (a command-line flag), then the parser turns
claims into check */
auto e = parse_expr(p);
auto hi = e.span.hi;
ex = if (p.get_session().get_opts().check_claims) {
ast::expr_check(ast::checked, e)
}
else {
ast::expr_check(ast::unchecked, e)
};
} else if (eat_word(p, "ret")) {
alt (p.peek()) {
case (token::SEMI) { ex = ast::expr_ret(none); }
@ -1596,7 +1609,7 @@ fn stmt_ends_with_semi(&ast::stmt stmt) -> bool {
case (ast::expr_put(_)) { true }
case (ast::expr_be(_)) { true }
case (ast::expr_log(_, _)) { true }
case (ast::expr_check(_)) { true }
case (ast::expr_check(_, _)) { true }
case (ast::expr_if_check(_, _, _)) { false }
case (ast::expr_port(_)) { true }
case (ast::expr_chan(_)) { true }