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>

diff --git a/src/cmd/compile/internal/ssagen/abi.go b/src/cmd/compile/internal/ssagen/abi.go
index 9e89da90c95960f554c09a8590290094c66b6613..6b6adff81f0acd6b0d05e0b83dba78f3b9d40e9d 100644 (file)
--- a/src/cmd/compile/internal/ssagen/abi.go
+++ b/src/cmd/compile/internal/ssagen/abi.go
@@ -451,8 +451,10 @@ func resultsToWasmFields(f *ir.Func, pragma string, result *abi.ABIParamResultIn
                        wfs[i].Type = obj.WasmF32
                case types.TFLOAT64:
                        wfs[i].Type = obj.WasmF64
+               case types.TUNSAFEPTR:
+                       wfs[i].Type = obj.WasmPtr
                default:
-                       base.ErrorfAt(f.Pos(), 0, "go:wasmimport %s %s: unsupported result type %s", f.WasmImport.Module, f.WasmImport.Name, t.String())
+                       base.ErrorfAt(f.Pos(), 0, "%s: unsupported result type %s", pragma, t.String())
                }
                wfs[i].Offset = p.FrameOffset(result)
        }

diff --git a/test/wasmexport2.go b/test/wasmexport2.go
index c7c0fa2ec88ec72870d678d81f28e402cfb2944a..e3b3bbed6e1847b71f365f947567c88c868e28a8 100644 (file)
--- 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"