Support visibility control and default to `internal`. (#3380)

* Support visibility control and default to `internal`.

* Fix wip.

* Fixes.

* Fix.

* Fix test.

* Add legacy language detection and compatibility for existing code.

* Add doc.

---------

Co-authored-by: Yong He <yhe@nvidia.com>

2 files changed, 10 insertions, 10 deletions

diff --git a/tools/slang-unit-test/unit-test-com-host-callable.slang b/tools/slang-unit-test/unit-test-com-host-callable.slang
index 75c985040..e41eed8ef 100644
--- a/tools/slang-unit-test/unit-test-com-host-callable.slang
+++ b/tools/slang-unit-test/unit-test-com-host-callable.slang
@@ -2,19 +2,19 @@
 
 // Example of using 'NativeString'
 
-public __extern_cpp NativeString getString(NativeString in)
+export __extern_cpp NativeString getString(NativeString in)
 {
     return in;
 }
 
-public __extern_cpp __global int intGlobal = 10;
+export __extern_cpp __global int intGlobal = 10;
 
-public __extern_cpp void setGlobal(int v)
+export __extern_cpp void setGlobal(int v)
 {
     intGlobal = v;
 }
 
-public __extern_cpp int getGlobal()
+export __extern_cpp int getGlobal()
 {
     return intGlobal;
 }
@@ -32,19 +32,19 @@ interface ICountGood
     int nextCount();
 }
 
-public __extern_cpp __global ICountGood globalCounter;
+export __extern_cpp __global ICountGood globalCounter;
 
-public __extern_cpp void setCounter(ICountGood counter)
+export __extern_cpp void setCounter(ICountGood counter)
 {
     globalCounter = counter;
 }
 
-public __extern_cpp int nextCount()
+export __extern_cpp int nextCount()
 {
     return globalCounter.nextCount();
 }
 
-public __extern_cpp int calcHash(NativeString text, IDoThings doThings)
+export __extern_cpp int calcHash(NativeString text, IDoThings doThings)
 {
     return doThings.calcHash(text);
 }
diff --git a/tools/slang-unit-test/unit-test-translation-unit-import.cpp b/tools/slang-unit-test/unit-test-translation-unit-import.cpp
index 3a0a98e17..b8108644e 100644
--- a/tools/slang-unit-test/unit-test-translation-unit-import.cpp
+++ b/tools/slang-unit-test/unit-test-translation-unit-import.cpp
@@ -18,7 +18,7 @@ SLANG_UNIT_TEST(translationUnitImport)
 {
     // Source for the first translation unit.
     const char* generatedSource =
-        "int f() {"
+        "public int f() {"
         "   return 5;"
         "};";
 
@@ -28,7 +28,7 @@ SLANG_UNIT_TEST(translationUnitImport)
         R"(
         import generatedUnit;
 
-        int g(){ return f(); }
+        public int g(){ return f(); }
         )";
 
     // Source for a module that transitively uses the generated source via a file.