[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

4 files changed, 38 insertions, 1 deletions

diff --git a/llvm/test/tools/llvm-symbolizer/Inputs/coff-dwarf.cpp b/llvm/test/tools/llvm-symbolizer/Inputs/coff-dwarf.cpp
index 9741439cdcf..3a832a9fcff 100644
--- a/llvm/test/tools/llvm-symbolizer/Inputs/coff-dwarf.cpp
+++ b/llvm/test/tools/llvm-symbolizer/Inputs/coff-dwarf.cpp
@@ -1,5 +1,5 @@
 // To generate the corresponding EXE, run:
-// clang-cl -O2 -gdwarf -c coff-dwarf.cpp && lld-link -debug coff-dwarf.obj
+// clang-cl -MD -O2 -gdwarf -c coff-dwarf.cpp && lld-link -debug coff-dwarf.obj
 
 extern "C" int puts(const char *str);
 
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;
+}
diff --git a/llvm/test/tools/llvm-symbolizer/Inputs/coff-exports.exe b/llvm/test/tools/llvm-symbolizer/Inputs/coff-exports.exe
new file mode 100644
index 00000000000..939205e3f82
--- /dev/null
+++ b/llvm/test/tools/llvm-symbolizer/Inputs/coff-exports.exe
diff --git a/llvm/test/tools/llvm-symbolizer/coff-exports.test b/llvm/test/tools/llvm-symbolizer/coff-exports.test
new file mode 100644
index 00000000000..7283acda2fc
--- /dev/null
+++ b/llvm/test/tools/llvm-symbolizer/coff-exports.test
@@ -0,0 +1,17 @@
+RUN: grep '^ADDR:' %s | sed -s 's/ADDR: //' \
+RUN: 	 | llvm-symbolizer --inlining --relative-address -obj="%p/Inputs/coff-exports.exe" \
+RUN:	 | FileCheck %s
+
+ADDR: 0x500A
+ADDR: 0x5038
+ADDR: 0x504B
+
+We get the expected stack trace, except 'foo' appears for the 'bar' frame
+because 'bar' isn't in the export table.
+
+CHECK: foo(void)
+CHECK: ??:0:0
+CHECK: foo(void)
+CHECK: ??:0:0
+CHECK: main
+CHECK: ??:0:0