[all-commits] [llvm/llvm-project] a28db8: [dfsan] Add empty APIs for field-level shadow

[Z via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: a28db8b27a232cffcb77d0f902d76ee07cd54c05
      https://github.com/llvm/llvm-project/commit/a28db8b27a232cffcb77d0f902d76ee07cd54c05
  Author: Jianzhou Zhao <jianzhouzh at google.com>
  Date:   2020-12-04 (Fri, 04 Dec 2020)

  Changed paths:
    M llvm/lib/Transforms/Instrumentation/DataFlowSanitizer.cpp

  Log Message:
  -----------
  [dfsan] Add empty APIs for field-level shadow

This is a child diff of D92261.

This diff adds APIs that return shadow type/value/zero from origin
objects. For the time being these APIs simply returns primitive
shadow type/value/zero. The following diff will be implementing the
conversion.

As D92261 explains, some cases still use primitive shadow during
the incremential changes. The cases include
1) alloca/load/store
2) custom function IO
3) vectors
At the cases this diff does not use the new APIs, but uses primitive
shadow objects explicitly.

Reviewed-by: morehouse

Differential Revision: https://reviews.llvm.org/D92629