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cmd/cgo: use function arg type for _cgoCheckPointerN function

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When cgo writes a _cgoCheckPointerN function to handle unsafe.Pointer,
use the function's argument type rather than interface{}. This permits
type errors to be detected at build time rather than run time.

Fixes #13830.

Change-Id: Ic7090905e16b977e2379670e0f83640dc192b565
Reviewed-on: https://go-review.googlesource.com/23675
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Austin Clements <austin@google.com>
This commit is contained in:
Ian Lance Taylor 2016-06-01 21:32:47 -07:00
parent 894803c11e
commit 837984f372
3 changed files with 31 additions and 4 deletions
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2
src/cmd/cgo/out.go
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@ -113,7 +113,7 @@ func (p *Package) writeDefs() {
for i, t := range p.CgoChecks {
n := p.unsafeCheckPointerNameIndex(i)
fmt.Fprintf(fgo2, "\nfunc %s(p interface{}, args ...interface{}) %s {\n", n, t)
fmt.Fprintf(fgo2, "\nfunc %s(p %s, args ...interface{}) %s {\n", n, t, t)
fmt.Fprintf(fgo2, "\treturn _cgoCheckPointer(p, args...).(%s)\n", t)
fmt.Fprintf(fgo2, "}\n")
}