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authorPéter Gömöri <[email protected]>2016-07-09 17:21:27 +0200
committerPéter Gömöri <[email protected]>2016-07-09 17:21:27 +0200
commitfee45935eb7f5a098cbbbaf1c8d1a8f9a77ce418 (patch)
treee5223681e9729194ed05c63eda92478a1c14d42d /plt
parentca4000874a198b218fd62b90e842475d2a0bb8c7 (diff)
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Fix infinite loop in merl_transform
This can happen when a syntactically incorrect text is passed to a merl:qquote/2,/3 call. The parse transform optimizes calls to some functions in merl by converting strings into templates at compile time. If this evaluation fails (in eval_call/4 - for example because of a sytanx error in the parsed text) the original function call should be kept unchanged. However in case of qquote/3 the call is converted into a combination of quote/2 and subst/2, but upon failure the original qquote/3 call is substituted into the wrong place. E.g.: this expression merl:qquote(Pos, Text, Env) is first converted to merl:subst(merl:quote(Pos, Text), Env) then if evaluating the quote call fails into merl:subst(merl:qquote(Pos, Text, Env), Env) and the expansion is run again on the internal qquote/3 argument resulting in an infinite loop. This is now fixed so in case of failure the original qquote/3 call is kept.
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