cmd/compile: correct wasmexport result type checking

The function resultsToWasmFields was originally for only
wasmimport. I adopted it for wasmexport as well, but forgot to
update a few places that were wasmimport-specific. This leads to
compiler panic if an invalid result type is passed, and also
unsafe.Pointer not actually supported. This CL fixes it.

Updates #65199.

Change-Id: I9bbd7154b70422504994840ff541c39ee596ee8f
Reviewed-on: https://go-review.googlesource.com/c/go/+/611315
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Achille Roussel <achille.roussel@gmail.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/test/wasmexport2.go b/test/wasmexport2.go
index c7c0fa2ec8..e3b3bbed6e 100644
--- a/test/wasmexport2.go
+++ b/test/wasmexport2.go
@@ -24,6 +24,9 @@ func good2(MyInt32) {} // named type is ok
 //go:wasmexport good3
 func good3() int32 { return 0 } // one result is ok
 
+//go:wasmexport good4
+func good4() unsafe.Pointer { return nil } // one result is ok
+
 //go:wasmexport bad1
 func bad1(string) {} // ERROR "go:wasmexport: unsupported parameter type"
 
@@ -54,5 +57,11 @@ func bad7(*S) {} // ERROR "go:wasmexport: unsupported parameter type"
 //go:wasmexport bad8
 func bad8([4]int32) {} // ERROR "go:wasmexport: unsupported parameter type"
 
+//go:wasmexport bad9
+func bad9() bool { return false } // ERROR "go:wasmexport: unsupported result type"
+
+//go:wasmexport bad10
+func bad10() *byte { return nil } // ERROR "go:wasmexport: unsupported result type"
+
 //go:wasmexport toomanyresults
 func toomanyresults() (int32, int32) { return 0, 0 } // ERROR "go:wasmexport: too many return values"