[PATCH] D23264: Fixes calculateRangesAfterReplacements crash when Replacements is empty.

[Eric Liu via cfe-commits]

ioeric created this revision.
ioeric added reviewers: klimek, djasper.
ioeric added a subscriber: cfe-commits.
Herald added a subscriber: klimek.

https://reviews.llvm.org/D23264

Files:
  lib/Tooling/Core/Replacement.cpp
  unittests/Tooling/RefactoringTest.cpp

Index: unittests/Tooling/RefactoringTest.cpp
===================================================================
--- unittests/Tooling/RefactoringTest.cpp
+++ unittests/Tooling/RefactoringTest.cpp
@@ -506,6 +506,13 @@
   EXPECT_TRUE(Ranges[1].getLength() == 22);
 }
 
+TEST(Range, RangesAfterEmptyReplacements) {
+  std::vector<Range> Ranges = {Range(5, 6), Range(10, 5)};
+  Replacements Replaces;
+  std::vector<Range> Expected = {Range(5, 10)};
+  EXPECT_EQ(Expected, calculateRangesAfterReplacements(Replaces, Ranges));
+}
+
 TEST(Range, RangesAfterReplacements) {
   std::vector<Range> Ranges = {Range(5, 2), Range(10, 5)};
   Replacements Replaces = toReplacements({Replacement("foo", 0, 2, "1234")});
Index: lib/Tooling/Core/Replacement.cpp
===================================================================
--- lib/Tooling/Core/Replacement.cpp
+++ lib/Tooling/Core/Replacement.cpp
@@ -361,6 +361,8 @@
   //   - Merge with \p Replaces.
   //   - The new ranges will be the affected ranges of the merged replacements.
   auto MergedRanges = combineAndSortRanges(Ranges);
+  if (Replaces.empty())
+    return MergedRanges;
   tooling::Replacements FakeReplaces;
   for (const auto &R : MergedRanges) {
     auto Err = FakeReplaces.add(Replacement(Replaces.begin()->getFilePath(),


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