From 65c2e7f1ccc6cdb5daec343c7e32b4a9dc463ae4 Mon Sep 17 00:00:00 2001
From: Yong He <yonghe@outlook.com>
Date: Tue, 12 Apr 2022 15:23:53 -0700
Subject: Support `[DllImport]` (#2181)

* Support `[DllImport]`

* Fix.

* Fix.

* Fix array type emit in cpp.

* Fix.

* Fix.

* Fix

Co-authored-by: Yong He <yhe@nvidia.com>
---
 source/slang-rt/slang-rt.cpp | 49 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 source/slang-rt/slang-rt.cpp

(limited to 'source/slang-rt/slang-rt.cpp')

diff --git a/source/slang-rt/slang-rt.cpp b/source/slang-rt/slang-rt.cpp
new file mode 100644
index 000000000..163a1b99c
--- /dev/null
+++ b/source/slang-rt/slang-rt.cpp
@@ -0,0 +1,49 @@
+#include "slang-rt.h"
+#include "../core/slang-basic.h"
+#include "../core/slang-shared-library.h"
+
+#if SLANG_WINDOWS_FAMILY
+#    include <Windows.h>
+#endif
+
+using namespace Slang;
+Dictionary<String, ComPtr<ISlangSharedLibrary>> slangRT_loadedLibraries;
+
+extern "C"
+{
+    SLANG_RT_API void SLANG_MCALL _slang_rt_abort(Slang::String errorMessage)
+    {
+        fprintf(stderr, "%s", errorMessage.getBuffer());
+#if SLANG_WINDOWS_FAMILY
+        MessageBoxA(0, errorMessage.getBuffer(), "Slang Runtime Error", MB_ICONERROR);
+#endif
+        abort();
+    }
+
+    SLANG_RT_API void* SLANG_MCALL _slang_rt_load_dll(Slang::String modulePath)
+    {
+        ComPtr<ISlangSharedLibrary> lib;
+        if (!slangRT_loadedLibraries.TryGetValue(modulePath, lib))
+        {
+            if (DefaultSharedLibraryLoader::getSingleton()->loadSharedLibrary(
+                    modulePath.getBuffer(), lib.writeRef()) != SLANG_OK)
+            {
+                _slang_rt_abort("Failed to load DLL \"" + modulePath + "\"");
+            }
+            slangRT_loadedLibraries[modulePath] = lib;
+        }
+        return lib.get();
+    }
+
+    SLANG_RT_API void* SLANG_MCALL
+        _slang_rt_load_dll_func(void* moduleHandle, Slang::String funcName)
+    {
+        auto lib = static_cast<ISlangSharedLibrary*>(moduleHandle);
+        auto funcPtr = lib->findFuncByName(funcName.getBuffer());
+        if (!funcPtr)
+        {
+            _slang_rt_abort("Cannot find function \"" + funcName + "\" in loaded library.");
+        }
+        return (void*)funcPtr;
+    }
+}
-- 
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