[all-commits] [llvm/llvm-project] cc07fb: Release pages to OS when setting 0 label

[Z via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: cc07fbe37dc82eeb3e6261a4c54f44b22cbb531d
      https://github.com/llvm/llvm-project/commit/cc07fbe37dc82eeb3e6261a4c54f44b22cbb531d
  Author: Jianzhou Zhao <jianzhouzh at google.com>
  Date:   2020-10-20 (Tue, 20 Oct 2020)

  Changed paths:
    M compiler-rt/lib/dfsan/dfsan.cpp
    M compiler-rt/lib/dfsan/dfsan_interceptors.cpp

  Log Message:
  -----------
  Release pages to OS when setting 0 label

This is a follow up patch of https://reviews.llvm.org/D88755.

When set 0 label for an address range, we can release pages within the
corresponding shadow address range to OS, and set only addresses outside
the pages to be 0.

Reviewed-by: morehouse, eugenis
Differential Revision: https://reviews.llvm.org/D89199