Refactor AArch64 ABI support to extract common bits for shared impl with x64.

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We have observed that the ABI implementations for AArch64 and x64 are
very similar; in fact, x64's implementation started as a modified copy
of AArch64's implementation. This is an artifact of both a similar ABI
(both machines pass args and return values in registers first, then the
stack, and both machines give considerable freedom with stack-frame
layout) and a too-low-level ABI abstraction in the existing design. For
machines that fit the mainstream or most common ABI-design idioms, we
should be able to do much better.

This commit factors AArch64 into machine-specific and
machine-independent parts, but does not yet modify x64; that will come
next.

This should be completely neutral with respect to compile time and
generated code performance.

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This commit is contained in:

Chris Fallin

2020-08-12 20:31:35 -07:00

parent 38ef98700f

commit 5cf3fba3da

10 changed files with 2039 additions and 1693 deletions

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cranelift/codegen/src/machinst/abi_impl.rs Normal file

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