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x64 and aarch64: allow StructArgument and StructReturn args.

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The StructReturn ABI is fairly simple at the codegen/isel level: we only
need to take care to return the sret pointer as one of the return values
if that wasn't specified in the initial function signature.

Struct arguments are a little more complex. A struct argument is stored
as a chunk of memory in the stack-args space. However, the CLIF
semantics are slightly special: on the caller side, the parameter passed
in is a pointer to an arbitrary memory block, and we must memcpy this
data to the on-stack struct-argument; and on the callee side, we provide
a pointer to the passed-in struct-argument as the CLIF block param
value.

This is necessary to support various ABIs other than Wasm, such as that
of Rust (with the cg_clif codegen backend).
This commit is contained in:
Chris Fallin
2020-12-13 18:50:59 -08:00
parent 25088dee9d
commit 456561f431
14 changed files with 641 additions and 166 deletions
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2
cranelift/filetests/filetests/isa/x64/i128.clif
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@@ -1006,7 +1006,7 @@ block0(v0: i128, v1: i128):
; nextln: movq %rsp, %rbp
; nextln: subq $$16, %rsp
; nextln: movq %r12, 0(%rsp)
; nextln: virtual_sp_offset_adjust 8
; nextln: virtual_sp_offset_adjust 16
; nextln: movq %r8, %r12
; nextln: subq $$16, %rsp
; nextln: virtual_sp_offset_adjust 16