llvm/tools/llvm-reduce/deltas/ReduceDbgRecords.cpp

   1 //===- ReduceDbgRecords.cpp - Specialized Delta Pass ----------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file implements a function which calls the Generic Delta pass in order
  10 // to reduce uninteresting DbgVariableRecords from defined functions.
  11 //
  12 // DbgVariableRecords store variable-location debug-info and are attached to
  13 // instructions. This information used to be represented by intrinsics such as
  14 // dbg.value, and would naturally get reduced by llvm-reduce like any other
  15 // instruction. As DbgVariableRecords get stored elsewhere, they need to be
  16 // enumerated and eliminated like any other data structure in LLVM.
  17 //
  18 //===----------------------------------------------------------------------===//
  19
  20 #include "ReduceDbgRecords.h"
  21 #include "Utils.h"
  22 #include "llvm/ADT/STLExtras.h"
  23
  24 using namespace llvm;
  25
  26 static void extractDbgRecordsFromModule(Oracle &O, ReducerWorkItem &WorkItem) {
  27   Module &M = WorkItem.getModule();
  28
  29   for (auto &F : M)
  30     for (auto &BB : F)
  31       for (auto &I : BB)
  32         for (DbgRecord &DR : llvm::make_early_inc_range(I.getDbgRecordRange()))
  33           if (!O.shouldKeep())
  34             DR.eraseFromParent();
  35 }
  36
  37 void llvm::reduceDbgRecordDeltaPass(TestRunner &Test) {
  38   runDeltaPass(Test, extractDbgRecordsFromModule, "Reducing DbgRecords");
  39 }