[llvm] [ctx_prof] CtxProfAnalysis: populate module data (PR #102930)

[Snehasish Kumar via llvm-commits]

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@@ -349,3 +350,34 @@ bool CtxInstrumentationLowerer::lowerFunction(Function &F) {
         F.getName());
   return true;
 }
+
+const char *AssignUniqueIDPass::GUIDMetadataName = "unique_id";
+
+PreservedAnalyses AssignUniqueIDPass::run(Module &M,
+                                          ModuleAnalysisManager &MAM) {
+  for (auto &F : M.functions()) {
+    if (F.isDeclaration())
+      continue;
+    const GlobalValue::GUID GUID = F.getGUID();
+    assert(!F.getMetadata(GUIDMetadataName) ||
+           GUID == AssignUniqueIDPass::getGUID(F));
+    F.setMetadata(GUIDMetadataName,
+                  MDNode::get(M.getContext(),
+                              {ConstantAsMetadata::get(ConstantInt::get(
+                                  Type::getInt64Ty(M.getContext()), GUID))}));
+  }
+  return PreservedAnalyses::none();
+}
+
+GlobalValue::GUID AssignUniqueIDPass::getGUID(const Function &F) {
+  if (F.isDeclaration()) {
+    assert(GlobalValue::isExternalLinkage(F.getLinkage()));
+    return GlobalValue::getGUID(F.getGlobalIdentifier());
+  }
+  auto *MD = F.getMetadata(GUIDMetadataName);
+  assert(MD);
----------------
snehasish wrote:

assert(MD && "missing guid metadata");

https://github.com/llvm/llvm-project/pull/102930