[wasm] Fix typedef for non-void interp entry callbacks (#59990)

github-actions[bot] · lambdageek · web-flow · commit 92ff02435693 · 2021-10-17T22:07:24.000-07:00
For UnmanagedCallersOnly methods that return non-void, pass the address of the
return variable to the interp entry method.

Co-authored-by: Aleksey Kliger &lt;alklig@microsoft.com&gt;
diff --git a/src/tasks/WasmAppBuilder/PInvokeTableGenerator.cs b/src/tasks/WasmAppBuilder/PInvokeTableGenerator.cs
@@ -326,7 +326,7 @@ private void EmitNativeToInterp(StreamWriter w, List<PInvokeCallback> callbacks)
             sb.Append($" (*WasmInterpEntrySig_{cb_index}) (");
             int pindex = 0;
             if (method.ReturnType.Name != "Void") {
-                sb.Append("int");
+                sb.Append("int*");
                 pindex++;
             }
             foreach (var p in method.GetParameters()) {

Original file line number	Diff line number	Diff line change
`@@ -326,7 +326,7 @@ private void EmitNativeToInterp(StreamWriter w, List<PInvokeCallback> callbacks)`
`326`	`326`	`sb.Append($" (*WasmInterpEntrySig_{cb_index}) (");`
`327`	`327`	`int pindex = 0;`
`328`	`328`	`if (method.ReturnType.Name != "Void") {`
`329`		`- sb.Append("int");`
	`329`	`+ sb.Append("int*");`
`330`	`330`	`pindex++;`
`331`	`331`	`}`
`332`	`332`	`foreach (var p in method.GetParameters()) {`