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Summary

  1. [COFF] Align ARM64 range extension thunks at instruction boundary (details)
Commit 7c816492197aefbaa2ea3ba0e391f7c6905956bc by Tom.Tan
[COFF] Align ARM64 range extension thunks at instruction boundary
RangeExtensionThunkARM64 is created for out-of-range branches on Windows
ARM64 because branch instructions has limited bits to encode target
address. Currently, RangeExtensionThunkARM64 is appended to its
referencing COFF section from object file at link time without any
alignment requirement, so if size of the preceding COFF section is not
aligned to instruction boundary (4 bytes), RangeExtensionThunkARM64 will
emit thunk instructions at unaligned address which is never a valid
branch target on ARM64, and usually triggers invalid instruction
exception when branching to it.
This PR fixes it by requiring such thunks to align at 4 bytes.
Differential revision: https://reviews.llvm.org/D72473
The file was modifiedlld/COFF/Chunks.h
The file was modifiedlld/test/COFF/arm64-thunks.s