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[AArch64][MachineOutliner] Return address signing for outlined functions

Authored by tellenbach on Oct 30 2019, 7:11 AM.

Description

[AArch64][MachineOutliner] Return address signing for outlined functions

Summary:
During AArch64 frame lowering instructions to enable return address
signing are inserted into function if needed. Functions generated during
machine outlining don't run through target frame lowering and hence are
missing such instructions.

This patch introduces the following changes:

  1. If not all functions that potentially participate in function outlining agree on their return address signing scope and their return address signing key, outlining is disabled for these functions.
  2. If not all functions that potentially participate in function outlining agree on their support for v8.3A features, outlining is disabled for these functions.
  3. If all candidate functions agree on the signing scope, signing key and and their support for v8.3 features, the outlined function behaves as if it had the same scope and key attributes and as if it would provide the same v8.3A support as the original functions.

Reviewers: olista01, paquette, t.p.northover, ostannard

Reviewed By: ostannard

Subscribers: ostannard, kristof.beyls, hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D69097