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Summary:
This patch introduces stack frame compression to GWP-ASan. Each stack frame is
variable-length integer encoded as the difference between frame[i] and
frame[i - 1]. Furthermore, we use zig-zag encoding on the difference to ensure
that negative differences are also encoded into a relatively small number of
bytes.
Examples of what the compression looks like can be seen in
`gwp_asan/tests/compression.cpp`.
This compression can reduce the memory consumption cost of stack traces by
~50%.
Reviewers: vlad.tsyrklevich
Reviewed By: vlad.tsyrklevich
Subscribers: mgorny, #sanitizers, llvm-commits, eugenis, morehouse
Tags: #sanitizers, #llvm
Differential Revision: https://reviews.llvm.org/D66189
llvm-svn: 369048
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