From fc0f4010bb4c4fb843218c6e3aa0112ffc67c299 Mon Sep 17 00:00:00 2001
From: Xiang1 Zhang <xiang1.zhang@intel.com>
Date: Mon, 14 Dec 2020 17:42:21 -0800
Subject: Revert "[Debugify] Support checking Machine IR debug info"

This reverts commit 57a3d9ec4a8c1422f07264bed9f12a4ea416707e.
---
 llvm/lib/CodeGen/MachineDebugify.cpp | 32 +-------------------------------
 1 file changed, 1 insertion(+), 31 deletions(-)

(limited to 'llvm/lib/CodeGen/MachineDebugify.cpp')

diff --git a/llvm/lib/CodeGen/MachineDebugify.cpp b/llvm/lib/CodeGen/MachineDebugify.cpp
index 599a818..bf57ec0 100644
--- a/llvm/lib/CodeGen/MachineDebugify.cpp
+++ b/llvm/lib/CodeGen/MachineDebugify.cpp
@@ -14,7 +14,6 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/ADT/DenseMap.h"
-#include "llvm/ADT/SmallSet.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/CodeGen/MachineFunctionPass.h"
 #include "llvm/CodeGen/MachineInstrBuilder.h"
@@ -90,11 +89,10 @@ bool applyDebugifyMetadataToMachineFunction(MachineModuleInfo &MMI,
   // Do this by introducing debug uses of each register definition. If that is
   // not possible (e.g. we have a phi or a meta instruction), emit a constant.
   uint64_t NextImm = 0;
-  SmallSet<DILocalVariable *, 16> VarSet;
   const MCInstrDesc &DbgValDesc = TII.get(TargetOpcode::DBG_VALUE);
   for (MachineBasicBlock &MBB : MF) {
     MachineBasicBlock::iterator FirstNonPHIIt = MBB.getFirstNonPHI();
-    for (auto I = MBB.begin(), E = MBB.end(); I != E;) {
+    for (auto I = MBB.begin(), E = MBB.end(); I != E; ) {
       MachineInstr &MI = *I;
       ++I;
 
@@ -115,7 +113,6 @@ bool applyDebugifyMetadataToMachineFunction(MachineModuleInfo &MMI,
         Line = EarliestDVI->getDebugLoc().getLine();
       DILocalVariable *LocalVar = Line2Var[Line];
       assert(LocalVar && "No variable for current line?");
-      VarSet.insert(LocalVar);
 
       // Emit DBG_VALUEs for register definitions.
       SmallVector<MachineOperand *, 4> RegDefs;
@@ -135,33 +132,6 @@ bool applyDebugifyMetadataToMachineFunction(MachineModuleInfo &MMI,
     }
   }
 
-  // Here we save the number of lines and variables into "llvm.mir.debugify".
-  // It is useful for mir-check-debugify.
-  NamedMDNode *NMD = M.getNamedMetadata("llvm.mir.debugify");
-  IntegerType *Int32Ty = Type::getInt32Ty(Ctx);
-  if (!NMD) {
-    NMD = M.getOrInsertNamedMetadata("llvm.mir.debugify");
-    auto addDebugifyOperand = [&](unsigned N) {
-      NMD->addOperand(MDNode::get(
-          Ctx, ValueAsMetadata::getConstant(ConstantInt::get(Int32Ty, N))));
-    };
-    // Add number of lines.
-    addDebugifyOperand(NextLine - 1);
-    // Add number of variables.
-    addDebugifyOperand(VarSet.size());
-  } else {
-    assert(NMD->getNumOperands() == 2 &&
-           "llvm.mir.debugify should have exactly 2 operands!");
-    auto setDebugifyOperand = [&](unsigned Idx, unsigned N) {
-      NMD->setOperand(Idx, MDNode::get(Ctx, ValueAsMetadata::getConstant(
-                                                ConstantInt::get(Int32Ty, N))));
-    };
-    // Set number of lines.
-    setDebugifyOperand(0, NextLine - 1);
-    // Set number of variables.
-    setDebugifyOperand(1, VarSet.size());
-  }
-
   return true;
 }
 
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