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internal/sys: add LR and fixed frame size to sys.Arch

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Storing this information in the Arch eliminates some code duplication
between the compiler and linker. This information is entirely
determined by the Arch, so the current approach of attaching it to an
entire Ctxt is a little silly. This will also make it easier to use
this information from tests.

The next CL will be a rote refactoring to eliminate the
Ctxt.FixedFrameSize methods.

Change-Id: I315c524fa66a0ea99f63ae5a2a6fdc367d843bad
Reviewed-on: https://go-review.googlesource.com/c/go/+/400818
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
This commit is contained in:
Austin Clements 2022-04-18 13:39:52 -04:00
parent caa46312ee
commit 8af7fac5a1
5 changed files with 152 additions and 133 deletions
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11
src/cmd/internal/obj/link.go
View file

@ -989,16 +989,7 @@ func (fi *FuncInfo) UnspillRegisterArgs(last *Prog, pa ProgAlloc) *Prog {
// on the stack in the function prologue and so always have a pointer between
// the hardware stack pointer and the local variable area.
func (ctxt *Link) FixedFrameSize() int64 {
switch ctxt.Arch.Family {
case sys.AMD64, sys.I386, sys.Wasm:
return 0
case sys.PPC64:
// PIC code on ppc64le requires 32 bytes of stack, and it's easier to
// just use that much stack always on ppc64x.
return int64(4 * ctxt.Arch.PtrSize)
default:
return int64(ctxt.Arch.PtrSize)
}
return ctxt.Arch.FixedFrameSize
}
// LinkArch is the definition of a single architecture.