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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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constructor_array.cpp	[copyright] Remove years	6 years ago
constructor_array.cpp.dot	[clang] rewrite scope computations	6 years ago
constructor_default_arg.cpp	[copyright] Remove years	6 years ago
constructor_default_arg.cpp.dot	[clang] rewrite scope computations	6 years ago
constructor_init.cpp	[copyright] Remove years	6 years ago
constructor_init.cpp.dot	[clang] rewrite scope computations	6 years ago
constructor_new.cpp	[copyright] Remove years	6 years ago
constructor_new.cpp.dot	[clang] rewrite scope computations	6 years ago
constructor_struct_init_list.cpp	[copyright] Remove years	6 years ago
constructor_struct_init_list.cpp.dot	[clang] rewrite scope computations	6 years ago
constructor_with_body.cpp	[copyright] Remove years	6 years ago
constructor_with_body.cpp.dot	[clang] rewrite scope computations	6 years ago
copy_array_field.cpp	[copyright] Remove years	6 years ago
copy_array_field.cpp.dot	[clang] rewrite scope computations	6 years ago
copy_move_constructor.cpp	[copyright] Remove years	6 years ago
copy_move_constructor.cpp.dot	[clang] rewrite scope computations	6 years ago
default_field_init.cpp	[copyright] Remove years	6 years ago
default_field_init.cpp.dot	[clang] rewrite scope computations	6 years ago
std_init_list.cpp	[copyright] Remove years	6 years ago
std_init_list.cpp.dot	[clang] rewrite scope computations	6 years ago
temp_object.cpp	[copyright] Remove years	6 years ago
temp_object.cpp.dot	[clang] rewrite scope computations	6 years ago