COM interfaces with host callable (#2258)

* #include an absolute path didn't work - because paths were taken to always be relative.

* Use TerminatedUnownedStringSlice for literals in output C++.

* Remove Escape/Unescape functions used in slang-token-reader.cpp
Add target type of 'host-cpp' etc to map to the target types.

* Fix some corner cases around string encoding.

* Added unit test for string escaping.
Fixed some assorted escaping bugs.

* Updated test output.

* Added decode test.

* Stop using hex output, to get around 'greedy' aspect. Use octal instead.

* Added HostHostCallable
Small changes to use ArtifactDesc/Info instead of large switches.

* Fix C++ emit to handle arbitrary function export.

* Add options handling for callable without an output being specified.

* Can compile with COM interface. Added example using com interface.

* Use the IR Ptr type instead of hack in C++ emit for interfaces.

* Fix issue with outputting the COM call when ptr is used.

* Fix crash issue on compilation failure.

1 files changed, 21 insertions, 0 deletions

diff --git a/examples/cpu-com-example/shader.slang b/examples/cpu-com-example/shader.slang
new file mode 100644
index 000000000..b0fe259be
--- /dev/null
+++ b/examples/cpu-com-example/shader.slang
@@ -0,0 +1,21 @@
+// shader.slang
+
+// Example of using 'NativeString'
+
+public __extern_cpp NativeString getString(NativeString in)
+{
+    return in;
+}
+
+[COM]
+interface IDoThings
+{
+    int doThing(int a, int b);
+    int calcHash(NativeString in);
+}
+
+public __extern_cpp int calcHash(NativeString text, IDoThings doThings)
+{
+    return doThings.calcHash(text);
+}
+