[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

4 files changed, 30 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
diff --git a/llvm/test/DebugInfo/llvm-symbolizer.test b/llvm/test/DebugInfo/llvm-symbolizer.test
index 20d3dda21ab..fdd64d69f5b 100644
--- a/llvm/test/DebugInfo/llvm-symbolizer.test
+++ b/llvm/test/DebugInfo/llvm-symbolizer.test
@@ -19,10 +19,15 @@ RUN: echo "%p/Inputs/macho-universal:x86_64 0x100000f05" >> %t.input
 RUN: echo "%p/Inputs/llvm-symbolizer-dwo-test 0x400514" >> %t.input
 RUN: echo "%p/Inputs/fission-ranges.elf-x86_64 0x720" >> %t.input
 RUN: echo "%p/Inputs/arange-overlap.elf-x86_64 0x714" >> %t.input
+RUN: cp %p/Inputs/split-dwarf-test.dwo %T
+RUN: echo "%p/Inputs/split-dwarf-test 0x4004d0" >> %t.input
+RUN: echo "%p/Inputs/split-dwarf-test 0x4004c0" >> %t.input
 
 RUN: llvm-symbolizer --functions=linkage --inlining --demangle=false \
 RUN:    --default-arch=i386 < %t.input | FileCheck %s
 
+REQUIRES: shell
+
 CHECK:       main
 CHECK-NEXT: /tmp/dbginfo{{[/\\]}}dwarfdump-test.cc:16
 
@@ -98,6 +103,14 @@ CHECK-NEXT: {{.*}}fission-ranges.cc:6
 CHECK: _ZN1S3bazEv
 CHECK-NEXT: {{.*}}arange-overlap.cc:6
 
+CHECK: _Z3fooi
+CHECK-NEXT: {{.*}}split-dwarf-test.cc
+CHECK-NEXT: main
+CHECK-NEXT: {{.*}}split-dwarf-test.cc
+
+CHECK: _Z3fooi
+CHECK-NEXT: {{.*}}split-dwarf-test.cc
+
 RUN: echo "unexisting-file 0x1234" > %t.input2
 RUN: llvm-symbolizer < %t.input2