tree 574852c6d1d0ee3d368a44a962696fce8194a3d7
parent 95175bcb6c716edb9bb2a1e15d85076fbf575d6f
author Jianzhou Zhao <jianzhouzh@google.com> 1613089798 +0000
committer Copybara-Service <copybara-worker@google.com> 1613725224 -0800

[dfsan] Add origin tls/move/read APIs

This is a part of https://reviews.llvm.org/D95835.

Added
1) TLS storage
2) a weak global used to set by instrumented code
3) move origins

These APIs are similar to MSan's APIs
  https://github.com/llvm/llvm-project/blob/main/compiler-rt/lib/msan/msan_poisoning.cpp
We first improved MSan's by https://reviews.llvm.org/D94572 and https://reviews.llvm.org/D94552.
So the correctness has been verified by MSan.
After the DFSan instrument code is ready, we wil be adding more test
cases

4) read

To reduce origin tracking cost, some of the read APIs return only
the origin from the first taint data.

Note that we did not add origin set APIs here because they are related
to code instrumentation, will be added later with IR transformation
code.

Reviewed-by: morehouse

Differential Revision: https://reviews.llvm.org/D96564

GitOrigin-RevId: 063a6fa87ece8a452daba99df7fb99751ed10165