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, 20 insertions, 0 deletions

diff --git a/source/slang/core.meta.slang b/source/slang/core.meta.slang
index ca07b299d..779900fd5 100644
--- a/source/slang/core.meta.slang
+++ b/source/slang/core.meta.slang
@@ -63,6 +63,26 @@ syntax unorm : UNormModifier;
 ///
 syntax snorm : SNormModifier;
 
+/// Modifier to indicate that a function name should not be mangled
+/// by the Slang compiler.
+///
+/// The `__unmangled` modifier should only be valid on functions
+/// and is mainly useful for the experimental heterogeneous
+/// features of Slang.
+///
+syntax __unmangled : UnmangledModifier;
+
+/// Modifier to indicate that a function name should be exported
+/// directly. Used in tandem with `__unmangled` in heterogeneous
+/// features of Slang.
+///
+syntax __exportDirectly : __exportDirectly;
+
+/// Modifier to indicate that a struct is defined externally and
+/// should therefore not be exported by Slang.
+///
+syntax __externLib : __externLib;
+
 /// A type that can be used as an operand for builtins
 [sealed]
 [builtin]