Delete use defined .h files and think later defined functions as known as modern languages. #2

changrui · 2019-10-22T11:52:22Z

such as follow:

void main() {
hello();
}

void hello() {
printf("Hello, world.\n");
}

we activate code (CODE_ON) only when the target labels are used, which doesn't happen during nocode_wanted regions. So, we cannot just switch off code either during nocode_wanted regions, nothing would switch it on again (except in the happy coincidences when we outright save/restore nocode_wanted). See the testcase for one example, reduced from code generated by yarpgen: in ext = (xxx || 1) // #1 || ((xxx && 1) || 1) // #2 code is first suppressed in #1 normally, then (before this commit) was suppressed via CODE_OFF during #2 (via indirect gjmp), then the suppression from #1 was undone, but nothing undoes the suppression from #2 anymore as everything therein was generated while nocode_wanted was active. So, we would either need to save/restore nocode_wanted around some more expressions, activate CODE_ON also with unused labels (breaks some optimizations we want), or deactivate CODE_OFF only when not already in nocode_wanted state. This does the latter.

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Delete use defined .h files and think later defined functions as known as modern languages. #2

Delete use defined .h files and think later defined functions as known as modern languages. #2

changrui commented Oct 22, 2019

Delete use defined .h files and think later defined functions as known as modern languages. #2

Delete use defined .h files and think later defined functions as known as modern languages. #2

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changrui commented Oct 22, 2019