[CodeView] Enable debugging of captured variables within C++ lambdas

This change will help Visual Studio resolve forward references to C++ lambda
routines used by captured variables.

Differential Revision: https://reviews.llvm.org/D45438

llvm-svn: 332975

1 files changed, 30 insertions, 0 deletions

diff --git a/clang/test/CodeGen/debug-info-codeview-unnamed.c b/clang/test/CodeGen/debug-info-codeview-unnamed.c
new file mode 100644
index 00000000000..bd2a7543e56
--- /dev/null
+++ b/clang/test/CodeGen/debug-info-codeview-unnamed.c
@@ -0,0 +1,30 @@
+// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -debug-info-kind=limited -S -emit-llvm -o - %s | FileCheck --check-prefix LINUX %s
+// RUN: %clang_cc1 -triple x86_64-windows-msvc -debug-info-kind=limited -gcodeview -S -emit-llvm -o - %s | FileCheck --check-prefix MSVC %s
+
+int main(int argc, char* argv[], char* arge[]) {
+
+  // In both DWARF and CodeView, an unnamed C structure type will generate a
+  // DICompositeType without a name or identifier attribute;
+  //
+  struct { int bar; } one = {42};
+  //
+  // LINUX:      !{{[0-9]+}} = !DILocalVariable(name: "one"
+  // LINUX-SAME:     type: [[TYPE_OF_ONE:![0-9]+]]
+  // LINUX-SAME:     )
+  // LINUX:      [[TYPE_OF_ONE]] = distinct !DICompositeType(
+  // LINUX-SAME:     tag: DW_TAG_structure_type
+  // LINUX-NOT:      name:
+  // LINUX-NOT:      identifier:
+  // LINUX-SAME:     )
+  //
+  // MSVC:       !{{[0-9]+}} = !DILocalVariable(name: "one"
+  // MSVC-SAME:      type: [[TYPE_OF_ONE:![0-9]+]]
+  // MSVC-SAME:      )
+  // MSVC:       [[TYPE_OF_ONE]] = distinct !DICompositeType
+  // MSVC-SAME:      tag: DW_TAG_structure_type
+  // MSVC-NOT:       name:
+  // MSVC-NOT:       identifier:
+  // MSVC-SAME:      )
+
+  return 0;
+}