[llvm-symbolizer] Use the export table if no symbols are present

This lets us make guesses about symbols in third party DLLs without
debug info, like MSVCR120.dll or kernel32.dll. dbghelp does the same
thing.

llvm-svn: 250582

1 files changed, 20 insertions, 0 deletions

diff --git a/llvm/test/tools/llvm-symbolizer/Inputs/coff-exports.cpp b/llvm/test/tools/llvm-symbolizer/Inputs/coff-exports.cpp
new file mode 100644
index 00000000000..23b44b32902
--- /dev/null
+++ b/llvm/test/tools/llvm-symbolizer/Inputs/coff-exports.cpp
@@ -0,0 +1,20 @@
+// To generate the corresponding EXE, run:
+// clang-cl -MD -c coff-exports.cpp && lld-link /MANIFEST:NO coff-exports.obj
+
+#define EXPORT __declspec(dllexport)
+
+extern "C" int puts(const char *str);
+
+EXPORT void __declspec(noinline) foo() {
+  puts("foo1");
+  puts("foo2");
+}
+
+void bar() {
+  foo();
+}
+
+EXPORT int main() {
+  bar();
+  return 0;
+}