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[clang] Frontend components for the relative vtables ABI (round 2)

Authored by leonardchan on Jun 11 2020, 11:17 AM.

Description

[clang] Frontend components for the relative vtables ABI (round 2)

This patch contains all of the clang changes from D72959.

  • Generalize the relative vtables ABI such that it can be used by other targets.
  • Add an enum VTableComponentLayout which controls whether components in the vtable should be pointers to other structs or relative offsets to those structs. Other ABIs can change this enum to restructure how components in the vtable are laid out/accessed.
  • Add methods to ConstantInitBuilder for inserting relative offsets to a specified position in the aggregate being constructed.
  • Fix failing tests under new PM and ASan and MSan issues.

See D72959 for background info.

Differential Revision: https://reviews.llvm.org/D77592

Details

Committed
leonardchanJun 11 2020, 11:17 AM
Differential Revision
D77592: [clang] Frontend components for the relative vtables ABI
Parents
rG59491b208f3f: Regenerated SROA phi-gep.ll test. NFC.
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