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Jules Villard 29f3941600 [clang] deal with conditionally-destroyed temporaries ... Summary: This was left as a TODO before: where to place calls to destructors for C++ temporaries that are only conditionally creating when evaluating an expression. This can happen inside the branches of a conditional operation `b?e:f` or in potentially-short-circuited conditions on the righ-hand side of `&&` and `||` operators. Following the compilation scheme of clang (observed by looking at the generated LLVM bitcode), we instrument the program with "marker" variables, so that for instance `X x = true?X():y;` becomes (following the execution on the true branch): ``` marker1 = 0; // initialize all markers to 0 PRUNE(true) // entering true branch X::X(&temporary); // create temporary... marker1 = 1; // ...triggers setting its marker to 1 X::X(&x, &temporary); // finish expression if (marker1) { X::~X(&temporary); // conditionally destroy the temporary } ``` In this diff, you'll find code for: - associating markers to temporaries that need them - code to initialize markers to 0 before full-expressions - code to conditionally destroy temporaries based on the values of the markers once the full-expression has finished evaluating Reviewed By: da319 Differential Revision: D24954070 fbshipit-source-id: cf15df7f7		4 years ago
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lambda1.cpp	[frontend] Captured struct variables in cpp lambdas	4 years ago
lambda1.cpp.dot	[clang] deal with conditionally-destroyed temporaries	4 years ago