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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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clang_compilation_database	Change license to MIT	7 years ago
clang_translation	[preanalysis] do not delay killing variables taken by reference	6 years ago
cmake	[DB] return resolved path when path cannot be made relative	8 years ago
componentkit	Format everything	6 years ago
linters	Format everything	6 years ago
make	[RFC] Format all java files	6 years ago
mvn	[RFC] Format all java files	6 years ago
ndk-build/hello_app	Add missing FB copyrights	6 years ago
objc_getters_setters	[IR] Take parameters into account in to_filename method	7 years ago
objc_missing_fld	Add test that exemplifies Missing_fld issue on objc	7 years ago
objc_retain_cycles	Decouple objc tests from xcode-select	6 years ago
objc_retain_cycles_weak	[objc] add test for strong/weak self references	6 years ago
path_with_spaces	Change license to MIT	7 years ago
xcodebuild/simple_app	Change license to MIT	7 years ago
.buckconfig	[buck-db] add flavour more robustly	8 years ago
.buckversion	[tests] fix buck tests	6 years ago
example.S	Change license to MIT	7 years ago
hello.c	Change license to MIT	7 years ago
hello.unknown_ext	Change license to MIT	7 years ago
hello2.c	Change license to MIT	7 years ago
hello3.c	Change license to MIT	7 years ago
hello_dup.c	[proc-cfg][2/5] fix duplicate symbols detection	6 years ago
preprocessed.c	Change license to MIT	7 years ago
some_bugs.c	Change license to MIT	7 years ago
some_different_bugs.c	Change license to MIT	7 years ago