[CodeGen] Port SafeStack to new pass manager (#73747)

Just copy the `runOnFunction` method from `SafeStackLegacyPass` and
remove the workaround for computing analysis lazily, the analysis result
in new pass manager is computed lazily by default.

1 files changed, 37 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/SafeStack.cpp b/llvm/lib/CodeGen/SafeStack.cpp
index ef293fa..88db57a 100644
--- a/llvm/lib/CodeGen/SafeStack.cpp
+++ b/llvm/lib/CodeGen/SafeStack.cpp
@@ -14,6 +14,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "llvm/CodeGen/SafeStack.h"
 #include "SafeStackLayout.h"
 #include "llvm/ADT/APInt.h"
 #include "llvm/ADT/ArrayRef.h"
@@ -927,6 +928,42 @@ public:
 
 } // end anonymous namespace
 
+PreservedAnalyses SafeStackPass::run(Function &F,
+                                     FunctionAnalysisManager &FAM) {
+  LLVM_DEBUG(dbgs() << "[SafeStack] Function: " << F.getName() << "\n");
+
+  if (!F.hasFnAttribute(Attribute::SafeStack)) {
+    LLVM_DEBUG(dbgs() << "[SafeStack]     safestack is not requested"
+                         " for this function\n");
+    return PreservedAnalyses::all();
+  }
+
+  if (F.isDeclaration()) {
+    LLVM_DEBUG(dbgs() << "[SafeStack]     function definition"
+                         " is not available\n");
+    return PreservedAnalyses::all();
+  }
+
+  auto *TL = TM->getSubtargetImpl(F)->getTargetLowering();
+  if (!TL)
+    report_fatal_error("TargetLowering instance is required");
+
+  auto &DL = F.getParent()->getDataLayout();
+
+  // preserve DominatorTree
+  auto &DT = FAM.getResult<DominatorTreeAnalysis>(F);
+  auto &SE = FAM.getResult<ScalarEvolutionAnalysis>(F);
+  DomTreeUpdater DTU(DT, DomTreeUpdater::UpdateStrategy::Lazy);
+
+  bool Changed = SafeStack(F, *TL, DL, &DTU, SE).run();
+
+  if (!Changed)
+    return PreservedAnalyses::all();
+  PreservedAnalyses PA;
+  PA.preserve<DominatorTreeAnalysis>();
+  return PA;
+}
+
 char SafeStackLegacyPass::ID = 0;
 
 INITIALIZE_PASS_BEGIN(SafeStackLegacyPass, DEBUG_TYPE,