getStringHash on string literals (#1140)

* WIP getStringHash

* Have a use.

* Add slang-string-hash.h/.cpp

* Use StringSlicePool for holding strings for StringHash.
Add outputBuffer to string-literal-hash.slang so value can be tested.
Ignore the GlobalHashedStringLiterals instruction on emit.

* Add all the hashed string literals to ProgramLayout.

* Add reflection support for hashed string literals to reflection test.

* Fix string literal hash test.

* Small fixes to pass test suite.

* Fix issue in serialization where IRUse is not correctly initialized.

* Fix problem initializing IRUse for string hash pass.
Remove hack from slang-ir-specialize - specially handling if user is not null.

* * Use shared builder when replacing getStringHash
* Comments for functions in slang-ir-string-hash
* Do not allow zero length string literals. Could be allowed, but doing so would require StringSlicePool to have a special case (or some other mechanism)

1 files changed, 44 insertions, 0 deletions

diff --git a/tests/ir/string-literal-hash-reflection.slang.expected b/tests/ir/string-literal-hash-reflection.slang.expected
new file mode 100644
index 000000000..4b3726efe
--- /dev/null
+++ b/tests/ir/string-literal-hash-reflection.slang.expected
@@ -0,0 +1,44 @@
+result code = 0
+standard error = {
+}
+standard output = {
+{
+    "parameters": [
+        {
+            "name": "outputBuffer",
+            "binding": {"kind": "unorderedAccess", "index": 0},
+            "type": {
+                "kind": "resource",
+                "baseShape": "structuredBuffer",
+                "access": "readWrite",
+                "resultType": {
+                    "kind": "scalar",
+                    "scalarType": "int32"
+                }
+            }
+        }
+    ],
+    "entryPoints": [
+        {
+            "name": "computeMain",
+            "stage:": "compute",
+            "parameters": [
+                {
+                    "name": "tid",
+                    "semanticName": "SV_DISPATCHTHREADINDEX",
+                    "type": {
+                        "kind": "scalar",
+                        "scalarType": "uint32"
+                    }
+                }
+            ],
+            "threadGroupSize": [4, 1, 1]
+        }
+    ],
+    "hashedStrings": {
+        "Hello \t\n\0x083 World": -215446506,
+        "Try another": 900483678
+    }
+
+}
+}