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reflect: fix register ABI spill space calculation

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Currently this does things the old way by computing the number of
registers, but we're going to be using their ABI0 layout for the spill
space for now.

Change-Id: Ibcef1ee48fd834af7cbdaabe704bcabe066ed358
Reviewed-on: https://go-review.googlesource.com/c/go/+/293011
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Trust: Michael Knyszek <mknyszek@google.com>
This commit is contained in:
Michael Anthony Knyszek 2021-02-17 19:14:03 +00:00 committed by Michael Knyszek
parent d8e33d558e
commit cda8ee095e
1 changed files with 5 additions and 8 deletions
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13
src/reflect/abi.go
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@ -334,8 +334,7 @@ func newAbiDesc(t *funcType, rcvr *rtype) abiDesc {
//
// TODO(mknyszek): Remove this when we no longer have
// caller reserved spill space.
spillInt := uintptr(0)
spillFloat := uintptr(0)
spill := uintptr(0)
// Compute gc program & stack bitmap for stack arguments
stackPtrs := new(bitVector)
@ -351,21 +350,19 @@ func newAbiDesc(t *funcType, rcvr *rtype) abiDesc {
stackPtrs.append(0)
}
} else {
spillInt += ptrSize
spill += ptrSize
}
}
for _, arg := range t.in() {
i, f := in.iregs, in.fregs
stkStep := in.addArg(arg)
if stkStep != nil {
addTypeBits(stackPtrs, stkStep.stkOff, arg)
} else {
i, f = in.iregs-i, in.fregs-f
spillInt += uintptr(i) * ptrSize
spillFloat += uintptr(f) * abi.EffectiveFloatRegSize
spill = align(spill, uintptr(arg.align))
spill += arg.size
}
}
spill := align(spillInt+spillFloat, ptrSize)
spill = align(spill, ptrSize)
// From the input parameters alone, we now know
// the stackCallArgsSize and retOffset.