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, 16 insertions, 1 deletions

diff --git a/source/slang/slang-ir-link.cpp b/source/slang/slang-ir-link.cpp
index 59cc625f5..0678b5962 100644
--- a/source/slang/slang-ir-link.cpp
+++ b/source/slang/slang-ir-link.cpp
@@ -4,6 +4,7 @@
 #include "slang-ir.h"
 #include "slang-ir-insts.h"
 #include "slang-mangle.h"
+#include "slang-ir-string-hash.h"
 
 namespace Slang
 {
@@ -1374,6 +1375,7 @@ LinkedIR linkIR(
     });
     irModules.addRange(linkage->m_libModules.getBuffer()->readRef(), linkage->m_libModules.getCount());
 
+    
     // Add any modules that were loaded as libraries
     for (IRModule* irModule : irModules)
     {
@@ -1387,8 +1389,21 @@ LinkedIR linkIR(
     //
     insertGlobalValueSymbols(sharedContext, targetProgram->getExistingIRModuleForLayout());
 
-
     auto context = state->getContext();
+
+    // Combine all of the contents of IRGlobalHashedStringLiterals
+    {
+        StringSlicePool pool;
+        IRBuilder& builder = sharedContext->builderStorage;
+        for (IRModule* irModule : irModules)
+        {
+            findGlobalHashedStringLiterals(irModule, pool);
+        }
+        addGlobalHashedStringLiterals(pool, *builder.sharedBuilder);
+    }
+
+    // Set up shared and builder insert point
+
     context->shared = sharedContext;
     context->builder = &sharedContext->builderStorage;