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Jules Villard db800f138b [clang] rewrite scope computations ... Summary: This started as an attempt to understand how to modify the frontend to inject destructors for C++ temporaries (see next diffs). This diff rewrites the existing logic for computing the list of variables that should be destroyed at the end of each statement, either because it's the end of their syntactic scope or because control flow branches outside of their syntactic scope. The frontend translates a function from the last instructions to the first, but scope computation needs to be done in the other direction, so it's done in a separate pass *before* the main translation happens. That first pass creates a map from statements in the AST to the list of variables that should be destroyed at the end of these statements. This is still the case now. Before, that map would be computed in a bit of a weird way: scopes are naturally a stack but instead of that the structure maintained was a flat list + a counter to know where the current scope ended in that list. In this diff, redo the computation maintaining a stack of scopes instead, which is a bit cleaner. Also treat more instructions as introducing a new scope, eg if, for, ... Reviewed By: mbouaziz Differential Revision: D15674208 fbshipit-source-id: c92429e82		6 years ago
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