[clang] [analyzer] Add time-trace scopes for high-level analyzer steps (PR #125508)

[Balázs Benics via cfe-commits]

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@@ -179,8 +181,41 @@ bool CoreEngine::ExecuteWorkList(const LocationContext *L, unsigned MaxSteps,
   return WList->hasWork();
 }
 
-void CoreEngine::dispatchWorkItem(ExplodedNode* Pred, ProgramPoint Loc,
-                                  const WorkListUnit& WU) {
+static std::string timeTraceScopeName(const ProgramPoint &Loc) {
+  if (llvm::timeTraceProfilerEnabled()) {
+    return llvm::formatv("Loc {0}",
+                         ProgramPoint::getProgramPointKindName(Loc.getKind()))
+        .str();
+  }
+  return "";
+}
+
+static llvm::TimeTraceMetadata timeTraceMetadata(const ExplodedNode *Pred,
+                                                 const ProgramPoint &Loc) {
+  // If time-trace profiler is not enabled, this function is never called.
+  assert(llvm::timeTraceProfilerEnabled());
+  std::string Detail = "";
+  if (const auto SP = Loc.getAs<StmtPoint>()) {
+    if (const Stmt *S = SP->getStmt())
+      Detail = S->getStmtClassName();
+  }
+  auto SLoc = Loc.getSourceLocation();
+  if (!SLoc)
+    return llvm::TimeTraceMetadata{Detail, ""};
+  const auto &SM = Pred->getLocationContext()
+                       ->getAnalysisDeclContext()
+                       ->getASTContext()
+                       .getSourceManager();
+  auto Line = SM.getPresumedLineNumber(*SLoc);
+  auto Fname = SM.getFilename(*SLoc);
+  return llvm::TimeTraceMetadata{Detail, Fname.str(), static_cast<int>(Line)};
+}
+
+void CoreEngine::dispatchWorkItem(ExplodedNode *Pred, ProgramPoint Loc,
+                                  const WorkListUnit &WU) {
+  llvm::TimeTraceScope tcs{timeTraceScopeName(Loc), [Loc, Pred]() {
+                             return timeTraceMetadata(Pred, Loc);
+                           }};
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balazs-benics-sonarsource wrote:

It took me a while to correlate the name `Loc PostStmt` with this place. I wonder if we should use `work item` as a disambiguation.

https://github.com/llvm/llvm-project/pull/125508