//===- ReduceDbgRecords.cpp - Specialized Delta Pass ----------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This file implements a function which calls the Generic Delta pass in order
// to reduce uninteresting DbgVariableRecords from defined functions.
//
// DbgVariableRecords store variable-location debug-info and are attached to
// instructions. This information used to be represented by intrinsics such as
// dbg.value, and would naturally get reduced by llvm-reduce like any other
// instruction. As DbgVariableRecords get stored elsewhere, they need to be
// enumerated and eliminated like any other data structure in LLVM.
//
//===----------------------------------------------------------------------===//

#include "ReduceDbgRecords.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/DebugProgramInstruction.h"

using namespace llvm;

void llvm::reduceDbgRecordDeltaPass(Oracle &O, ReducerWorkItem &WorkItem) {
  Module &M = WorkItem.getModule();

  for (auto &F : M)
    for (auto &BB : F)
      for (auto &I : BB)
        for (DbgRecord &DR : llvm::make_early_inc_range(I.getDbgRecordRange()))
          if (!O.shouldKeep())
            DR.eraseFromParent();
}