[DWARF parser] Fix nasty memory corruption in .dwo files handling.

Forge a test case where llvm-symbolizer has to use external .dwo
file to produce the inlining information.

llvm-svn: 217270

3 files changed, 17 insertions, 0 deletions

diff --git a/llvm/test/DebugInfo/Inputs/split-dwarf-test b/llvm/test/DebugInfo/Inputs/split-dwarf-test
new file mode 100755
index 00000000000..a4411129a9b
--- /dev/null
+++ b/llvm/test/DebugInfo/Inputs/split-dwarf-test
diff --git a/llvm/test/DebugInfo/Inputs/split-dwarf-test.cc b/llvm/test/DebugInfo/Inputs/split-dwarf-test.cc
new file mode 100644
index 00000000000..5ed56f94b36
--- /dev/null
+++ b/llvm/test/DebugInfo/Inputs/split-dwarf-test.cc
@@ -0,0 +1,17 @@
+int foo(int a) {
+  return a + 1;
+}
+
+int main(int argc, char *argv[]) {
+  return foo(argc);
+}
+
+// Build instructions:
+// 1) clang++ -### -O2 -gsplit-dwarf.cc split-dwarf-test.cc -o split-dwarf-test
+// 2) Replace the value "-fdebug-compilation-dir" flag to "Output"
+//      (this is the temp directory used by lit).
+// 3) Manually run clang-cc1, objcopy and ld invocations.
+// 4) Copy the binary and .dwo file to the Inputs directory. Make sure the
+//    .dwo file will be available for symbolizer (use test RUN-lines to copy
+//    the .dwo file to a directory
+//    <execution_directory>/<directory_provided_in_fdebug_compilation_dir>.
diff --git a/llvm/test/DebugInfo/Inputs/split-dwarf-test.dwo b/llvm/test/DebugInfo/Inputs/split-dwarf-test.dwo
new file mode 100644
index 00000000000..74183a4b622
--- /dev/null
+++ b/llvm/test/DebugInfo/Inputs/split-dwarf-test.dwo