[all-commits] [llvm/llvm-project] 02760b: Reland [AArch64][MachineOutliner] Return address s...

[David Tellenbach via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 02760b750b2ffcc0e2f5d78ecb137c80930c42c3
      https://github.com/llvm/llvm-project/commit/02760b750b2ffcc0e2f5d78ecb137c80930c42c3
  Author: David Tellenbach <david.tellenbach at me.com>
  Date:   2019-12-04 (Wed, 04 Dec 2019)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64InstrInfo.cpp
    A llvm/test/CodeGen/AArch64/machine-outliner-retaddr-sign-cfi.ll
    A llvm/test/CodeGen/AArch64/machine-outliner-retaddr-sign-diff-scope-same-key.ll
    A llvm/test/CodeGen/AArch64/machine-outliner-retaddr-sign-non-leaf.ll
    A llvm/test/CodeGen/AArch64/machine-outliner-retaddr-sign-regsave.mir
    A llvm/test/CodeGen/AArch64/machine-outliner-retaddr-sign-same-scope-diff-key.ll
    A llvm/test/CodeGen/AArch64/machine-outliner-retaddr-sign-same-scope-same-key-a.ll
    A llvm/test/CodeGen/AArch64/machine-outliner-retaddr-sign-same-scope-same-key-b.ll
    A llvm/test/CodeGen/AArch64/machine-outliner-retaddr-sign-sp-mod.mir
    A llvm/test/CodeGen/AArch64/machine-outliner-retaddr-sign-subtarget.ll
    A llvm/test/CodeGen/AArch64/machine-outliner-retaddr-sign-thunk.ll
    A llvm/test/CodeGen/AArch64/machine-outliner-retaddr-sign-v8-3.ll

  Log Message:
  -----------
  Reland [AArch64][MachineOutliner] Return address signing for outlined functions

Summary:
Reland after fixing a bug that allowed outlining of SP modifying instructions
that invalidated return address signing.

During AArch64 frame lowering instructions to enable return address
signing are inserted into functions 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 an outlining candidate would outline instructions that modify sp in a way
   that invalidates return address signing, outlining is disabled for that
   particular candidate.
4. If all candidate functions agree on the signing scope, signing key 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: ostannard, paquette

Reviewed By: ostannard

Subscribers: kristof.beyls, hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D70635