Merge from 0.9.x (#429)

* Fix bug when subscripting a type that must be split (#396)

The logic was creating a `PairPseudoExpr` as part of a subscript (`operator[]`) operation, but neglecting to fill in its `pairInfo` field, which led to a null-pointer crash further along.

* Allow writes to UAV textures (#416)

Work on #415

This issue is already fixed in the `v0.10.*` line, but I'm back-porting the fix to `v0.9.*`.
The issue here was that the stdlib declarations for texture types were only including the `get` accessor for subscript operations, even if the texture was write-able.

I've also included the fixes for other subscript accessors in the stdlib (notably that `OutputPatch<T>` is readable, but not writable, despite what the name seems to imply).

* Fix infinite loop in semantic parsing (#424)

The code for parsing semantics was looking for a fixed set of tokens to terminate a semantic list, rather than assuming that whenever you don't see a `:` ahead, you probably are done with semantics. This meant that you could get into an infinite loop just with simple mistakes like leaving out a `;`.

This change fixes the parser to note infinite loop in this case, and adds a test case to verify the fix.

1 files changed, 20 insertions, 0 deletions

diff --git a/tests/front-end/uav-write.slang b/tests/front-end/uav-write.slang
new file mode 100644
index 000000000..c70af26a3
--- /dev/null
+++ b/tests/front-end/uav-write.slang
@@ -0,0 +1,20 @@
+// uav-write.slang
+//TEST:SIMPLE:
+
+// Just confirming that code that writes to a UAV will type-check.
+
+RWTexture2D<float4> gOutput;
+
+float4 test(uint2 coord, float4 value)
+{
+	// read
+    value = value + gOutput[coord];
+
+    // write
+    gOutput[coord] = value;
+
+    // read-modify-write
+    gOutput[coord] += value;
+	
+	return value;
+}
\ No newline at end of file