1 files changed, 111 insertions, 0 deletions
diff --git a/contrib/llvm-project/llvm/lib/CodeGen/MachineStripDebug.cpp b/contrib/llvm-project/llvm/lib/CodeGen/MachineStripDebug.cpp
new file mode 100644
index 000000000000..a1cb12f91275
--- /dev/null
+++ b/contrib/llvm-project/llvm/lib/CodeGen/MachineStripDebug.cpp
@@ -0,0 +1,111 @@
+//===- MachineStripDebug.cpp - Strip debug info ---------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file This removes debug info from everything. It can be used to ensure
+/// tests can be debugified without affecting the output MIR.
+//===----------------------------------------------------------------------===//
+
+#include "llvm/CodeGen/MachineFunctionPass.h"
+#include "llvm/CodeGen/MachineModuleInfo.h"
+#include "llvm/CodeGen/Passes.h"
+#include "llvm/IR/DebugInfo.h"
+#include "llvm/InitializePasses.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Transforms/Utils/Debugify.h"
+
+#define DEBUG_TYPE "mir-strip-debug"
+
+using namespace llvm;
+
+namespace {
+cl::opt<bool>
+    OnlyDebugifiedDefault("mir-strip-debugify-only",
+                          cl::desc("Should mir-strip-debug only strip debug "
+                                   "info from debugified modules by default"),
+                          cl::init(true));
+
+struct StripDebugMachineModule : public ModulePass {
+  bool runOnModule(Module &M) override {
+    if (OnlyDebugified) {
+      NamedMDNode *DebugifyMD = M.getNamedMetadata("llvm.debugify");
+      if (!DebugifyMD) {
+        LLVM_DEBUG(dbgs() << "Not stripping debug info"
+                             " (debugify metadata not found)?\n");
+        return false;
+      }
+    }
+
+    MachineModuleInfo &MMI =
+        getAnalysis<MachineModuleInfoWrapperPass>().getMMI();
+
+    bool Changed = false;
+    for (Function &F : M.functions()) {
+      MachineFunction *MaybeMF = MMI.getMachineFunction(F);
+      if (!MaybeMF)
+        continue;
+      MachineFunction &MF = *MaybeMF;
+      for (MachineBasicBlock &MBB : MF) {
+        for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end();
+             I != E;) {
+          if (I->isDebugInstr()) {
+            // FIXME: We should remove all of them. However, AArch64 emits an
+            //        invalid `DBG_VALUE $lr` with only one operand instead of
+            //        the usual three and has a test that depends on it's
+            //        preservation. Preserve it for now.
+            if (I->getNumOperands() > 1) {
+              LLVM_DEBUG(dbgs() << "Removing debug instruction " << *I);
+              I = MBB.erase(I);
+              Changed |= true;
+              continue;
+            }
+          }
+          if (I->getDebugLoc()) {
+            LLVM_DEBUG(dbgs() << "Removing location " << *I);
+            I->setDebugLoc(DebugLoc());
+            Changed |= true;
+            ++I;
+            continue;
+          }
+          LLVM_DEBUG(dbgs() << "Keeping " << *I);
+          ++I;
+        }
+      }
+    }
+
+    Changed |= stripDebugifyMetadata(M);
+
+    return Changed;
+  }
+
+  StripDebugMachineModule() : StripDebugMachineModule(OnlyDebugifiedDefault) {}
+  StripDebugMachineModule(bool OnlyDebugified)
+      : ModulePass(ID), OnlyDebugified(OnlyDebugified) {}
+
+  void getAnalysisUsage(AnalysisUsage &AU) const override {
+    AU.addRequired<MachineModuleInfoWrapperPass>();
+    AU.addPreserved<MachineModuleInfoWrapperPass>();
+    AU.setPreservesCFG();
+  }
+
+  static char ID; // Pass identification.
+
+protected:
+  bool OnlyDebugified;
+};
+char StripDebugMachineModule::ID = 0;
+
+} // end anonymous namespace
+
+INITIALIZE_PASS_BEGIN(StripDebugMachineModule, DEBUG_TYPE,
+                      "Machine Strip Debug Module", false, false)
+INITIALIZE_PASS_END(StripDebugMachineModule, DEBUG_TYPE,
+                    "Machine Strip Debug Module", false, false)
+
+ModulePass *llvm::createStripDebugMachineModulePass(bool OnlyDebugified) {
+  return new StripDebugMachineModule(OnlyDebugified);
+}