Summary: For platforms which support slow unwinder only, we restrict the store context size to 1, basically only storing the current pc. We do this because the slow unwinder which is based on libunwind is not async signal safe and causes random freezes in forking applications as well as in signal handlers.
Reviewed by eugenis.
Differential: D23107
llvm-svn: 289027
These tests were recently enabled and have never worked on this builder.
Three tests were sensitive to line number changes:
test/msan/Linux/obstack.cc
test/msan/chained_origin.cc
test/msan/chained_origin_memcpy.cc
and this sensitivity will be addressed in a follow-up patch. Of these,
obstack.cc's sensitivity to line numbers is unexplained since it already uses
[[@LINE]].
llvm-svn: 278671
Origin history should only be recorded for uninitialized values, because it is
meaningless otherwise. This change moves __msan_chain_origin to the runtime
library side and makes it conditional on the corresponding shadow value.
Previous code was correct, but _very_ inefficient.
llvm-svn: 211700
Compiler-rt part of MSan implementation of advanced origin tracking,
when we record not only creation point, but all locations where
an uninitialized value was stored to memory, too.
llvm-svn: 204152
Sagar Thakur