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, 24 insertions, 0 deletions

diff --git a/source/slang/slang-reflection.cpp b/source/slang/slang-reflection.cpp
index 59130b0fc..306c45c14 100644
--- a/source/slang/slang-reflection.cpp
+++ b/source/slang/slang-reflection.cpp
@@ -1499,3 +1499,27 @@ SLANG_API  SlangReflectionType* spReflection_specializeType(
 
     return convert(specializedType);
 }
+
+SLANG_API SlangUInt spReflection_getHashedStringCount(
+    SlangReflection*  reflection)
+{
+    auto programLayout = convert(reflection);
+    return programLayout->hashedStringLiteralPool.getNumSlices() - StringSlicePool::kNumDefaultHandles;
+}
+
+SLANG_API const char* spReflection_getHashedString(
+    SlangReflection*  reflection,
+    SlangUInt index,
+    size_t* outCount)
+{
+    auto programLayout = convert(reflection);
+    UnownedStringSlice slice = programLayout->hashedStringLiteralPool.getSlice(StringSlicePool::Handle(index + StringSlicePool::kNumDefaultHandles));
+    *outCount = slice.size();
+    return slice.begin();
+}
+
+SLANG_API int spCalcStringHash(const char* chars, size_t count)
+{
+    UnownedStringSlice slice(chars, count);
+    return GetHashCode(slice);
+}