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Jules Villard 55586b581b [preanalysis] do not delay killing variables taken by reference ... Summary: Before, the liveness pre-analysis would place extra instructions in the CFG for either: 1. marking an `Ident.t` as dead, or 2. marking a `Pvar.t` as `= 0` But we have no way of marking pvars dead without setting them to 0. This is bad because setting pvars to 0 is not possible everywhere they are dead. Indeed, we only do it when we haven't seen their address being taken anyway. This prevents the following situation, recorded in our tests: ``` int address_taken() { int** x; int* y; int i = 7; y = &i; x = &y; // if we don't reason about taken addresses while adding nullify instructions, // we'll add // `nullify(y)` here and report a false NPE on the next line return **x; } ``` So we want to mark pvars as dead without nullifying them. This diff extends the `Remove_temps` SIL instruction to accept pvars as well, and so renames it to `ExitScope`. Reviewed By: da319 Differential Revision: D13102953 fbshipit-source-id: aa7f03a52		6 years ago
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bufferoverrun	[inferbo] Give semantics for unsigned int casting of minus one	6 years ago
conflicts	[kill -a][1/4] stop using `-a foo` in the infer repo	6 years ago
errors	[infer] Translate more casts (unsigned int)	6 years ago
frontend	[preanalysis] do not delay killing variables taken by reference	6 years ago
linters	[kill -a][1/4] stop using `-a foo` in the infer repo	6 years ago
linters-for-test-only	[kill -a][1/4] stop using `-a foo` in the infer repo	6 years ago
liveness	[infer] Translate casting expressions of integer pointers	6 years ago
nullable	[kill -a][1/4] stop using `-a foo` in the infer repo	6 years ago
ownership	[proc-cfg][2/5] fix duplicate symbols detection	6 years ago
pulse	[pulse] An example of false positive caused by an allocation in a branch	6 years ago
quandary	New function pointer preanalysis without recursion	6 years ago
quandaryBO	[inferbo] Trace refactoring	6 years ago
racerd	[kill -a][1/4] stop using `-a foo` in the infer repo	6 years ago
shared	[preanalysis] do not delay killing variables taken by reference	6 years ago
siof	[kill -a][1/4] stop using `-a foo` in the infer repo	6 years ago
starvation	[starvation] c++/Obj C deadlocks	6 years ago
uninit	[Uninit][7/13] Add new tests	6 years ago