[llvm] [HLSL] Diagnose overlapping resource bindings (PR #140982)

[Helena Kotas via llvm-commits]

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@@ -50,15 +51,55 @@ static void reportInvalidDirection(Module &M, DXILResourceMap &DRM) {
   }
 }
 
-} // namespace
+static void reportOverlappingError(Module &M, ResourceInfo R1,
+                                   ResourceInfo R2) {
+  SmallString<64> Message;
+  raw_svector_ostream OS(Message);
+  OS << "resource " << R1.getName() << " at register "
+     << R1.getBinding().LowerBound << " overlaps with resource " << R2.getName()
+     << " at register " << R2.getBinding().LowerBound << ", space "
+     << R2.getBinding().Space;
+  M.getContext().diagnose(DiagnosticInfoGeneric(Message));
+}
 
-PreservedAnalyses
-DXILPostOptimizationValidation::run(Module &M, ModuleAnalysisManager &MAM) {
-  DXILResourceMap &DRM = MAM.getResult<DXILResourceAnalysis>(M);
+static void reportOverlappingBinding(Module &M, DXILResourceMap &DRM) {
+  if (DRM.empty())
+    return;
 
+  for (auto ResList :
+       {DRM.srvs(), DRM.uavs(), DRM.cbuffers(), DRM.samplers()}) {
+    if (ResList.empty())
+      continue;
+    const ResourceInfo *PrevRI = &*ResList.begin();
+    for (auto *I = ResList.begin() + 1; I != ResList.end(); ++I) {
+      const ResourceInfo *RI = &*I;
+      if (PrevRI->getBinding().overlapsWith(RI->getBinding())) {
+        reportOverlappingError(M, *PrevRI, *RI);
+        continue;
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hekota wrote:

I've updated the code to detect all collisions and added a couple of tests.

https://github.com/llvm/llvm-project/pull/140982