[PATCH] D158363: [clang-format] Fix segmentation fault when formatting nested namespaces

[Arkadiy Yudintsev via Phabricator via cfe-commits]

d0nc1h0t updated this revision to Diff 553017.

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D158363/new/

https://reviews.llvm.org/D158363

Files:
  clang/lib/Format/UnwrappedLineFormatter.cpp
  clang/unittests/Format/FormatTest.cpp


Index: clang/unittests/Format/FormatTest.cpp
===================================================================
--- clang/unittests/Format/FormatTest.cpp
+++ clang/unittests/Format/FormatTest.cpp
@@ -4223,6 +4223,16 @@
                "void foo() {}\n"
                "} // namespace ns\n",
                Style);
+
+  FormatStyle LLVMWithCompactInnerNamespace = getLLVMStyle();
+  LLVMWithCompactInnerNamespace.CompactNamespaces = true;
+  LLVMWithCompactInnerNamespace.NamespaceIndentation = FormatStyle::NI_Inner;
+  verifyFormat("namespace ns1 { namespace ns2 { namespace ns3 {\n"
+                "// block for debug mode\n"
+                "#ifndef NDEBUG\n"
+                "#endif\n"
+                "}}} // namespace ns1::ns2::ns3",
+               LLVMWithCompactInnerNamespace);
 }
 
 TEST_F(FormatTest, NamespaceMacros) {
Index: clang/lib/Format/UnwrappedLineFormatter.cpp
===================================================================
--- clang/lib/Format/UnwrappedLineFormatter.cpp
+++ clang/lib/Format/UnwrappedLineFormatter.cpp
@@ -386,11 +386,14 @@
           // Reduce indent level for bodies of namespaces which were compacted,
           // but only if their content was indented in the first place.
           auto *ClosingLine = AnnotatedLines.begin() + ClosingLineIndex + 1;
-          auto OutdentBy = I[J]->Level - TheLine->Level;
+          int OutdentBy = I[J]->Level - TheLine->Level;
+          assert(OutdentBy >= 0);
           for (auto *CompactedLine = I + J; CompactedLine <= ClosingLine;
                ++CompactedLine) {
-            if (!(*CompactedLine)->InPPDirective)
-              (*CompactedLine)->Level -= OutdentBy;
+            if (!(*CompactedLine)->InPPDirective) {
+              const int Level = (*CompactedLine)->Level;
+              (*CompactedLine)->Level = std::max(Level - OutdentBy, 0);
+            }
           }
         }
         return J - 1;


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