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Jules Villard 8715c4f892 [clang] make switch statement translation more robust ... Summary: Labels inside switch statements were causing havoc (see test), and the translation of switch statements in general could be improved to handle more cases. It turns out that `case` (and `default`) statements are more or less fancy labels into the code. In other words, if you erase all the `case XXX:` and `default:` strings in the `switch` statement you get the real structure of the program, and `switch` just jumps straight to the first `case` directives (and to the second if the first one is not satisfied, etc. until all `case`/`default` have been considered). This suggests an alternative implementation: translate the body of the `switch` and simply record the list of switch cases inside that body, along with where they point to. Then post-process this list to construct the control flow of the `switch`, which points into the control-flow of the `body`. In order not to modify every function in `CTrans` to propagate the current list of cases, I created an ugly `ref` inside `SwitchCase` instead (but it cannot be directly accessed and it's guaranteed to be well-parenthesised wrt nested switches by the `SwitchCase` API so it's not too bad). [unrelated] Also make translation failures output more information about what exactly in the source code is causing the crash, and the ancestors in the AST that lead to the crash site. Reviewed By: martinoluca Differential Revision: D8011046 fbshipit-source-id: 8455090		7 years ago
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attributes	[clang] make switch statement translation more robust	7 years ago
builtin	[clang] enforce that `instruction` always returns one SIL expression	7 years ago
destructors	[clang] make switch statement translation more robust	7 years ago
globals	[clang] enforce that `instruction` always returns one SIL expression	7 years ago
include_header	[clang] enforce that `instruction` always returns one SIL expression	7 years ago
initialization	[clang] enforce that `instruction` always returns one SIL expression	7 years ago
keywords	[debug] print procedures in alphabetical order in cfgs	7 years ago
literals	[clang] enforce that `instruction` always returns one SIL expression	7 years ago
loops	[clang] enforce that `instruction` always returns one SIL expression	7 years ago
nestedoperators	[clang] enforce that `instruction` always returns one SIL expression	7 years ago
vectors	[clang] enforce that `instruction` always returns one SIL expression	7 years ago
Makefile	[clang] upgrade internal clang	7 years ago
shared	[tests] Clean up test files shared between frontend and endtoend tests	8 years ago