Fixed naming conflicts in heterogeneous-hello-world (#2114)

* Fixed naming conflicts in heterogeneous-hello-world

Added 3 new modifiers (`__unmangled`, `__exportDirectly`, `__externLib`)

`__unmangled`  causes mangleName() to return the normal name of the decl.

`__exportDirectly` changes parent decl name concatenation behavior to use
"::" instead of "." (for Name Hint) and emits the name hint when it exists,
otherwise it emits the mangled name.

`__externLib` stops Slang from emitting the corresponding struct.

Also made necessary changes to heterogeneous-hello-world so that this new
functionality is shown off.

* Undo unintentional formatting changes

Co-authored-by: Yong He <yonghe@outlook.com>

1 files changed, 15 insertions, 2 deletions

diff --git a/source/slang/slang-lower-to-ir.cpp b/source/slang/slang-lower-to-ir.cpp
index d4b069dca..b2a71a2e0 100644
--- a/source/slang/slang-lower-to-ir.cpp
+++ b/source/slang/slang-lower-to-ir.cpp
@@ -1034,7 +1034,7 @@ static void addLinkageDecoration(
         inst = outerGeneric;
     }
 
-    if(isImportedDecl(context, decl))
+    if (isImportedDecl(context, decl))
     {
         builder->addImportDecoration(inst, mangledName);
     }
@@ -1047,6 +1047,14 @@ static void addLinkageDecoration(
         builder->addPublicDecoration(inst);
         builder->addKeepAliveDecoration(inst);
     }
+    if (decl->findModifier<__exportDirectly>())
+    {
+        builder->addExportDirectlyDecoration(inst);
+    }
+    if (decl->findModifier<__externLib>())
+    {
+        builder->addExternLibDecoration(inst);
+    }
 }
 
 static void addLinkageDecoration(
@@ -1986,7 +1994,12 @@ static String getNameForNameHint(
 
     StringBuilder sb;
     sb.append(parentName);
-    sb.append(".");
+    if (decl->hasModifier<__exportDirectly>()) {
+        sb.append("::");
+    }
+    else {
+        sb.append(".");
+    }
     sb.append(leafName->text);
 
     return sb.ProduceString();