DebugInfo: Avoid creating DILexicalScopeFiles when the filename in the current scope has not changed.

This looks like the right way for this check to work, but there is
another semi-obvious bug, I would think: why is CurLoc not zero'd out
between functions? The possibility for it to bleed between them seems
problematic. (& indeed I caused tests to fail when I fixed this a
different way, by setting CurLoc to SourceLocation() and the end of
EmitFunctionEnd... )

The changes to debug-info-blocks.m are due to a mismatch between the
source manager's file naming and CGDebugInfo's default handling when no
-main-file-name is specified. This actually reveals somewhat of a bug in
the debug info when using source files from standard in, too. See the
comment in CGDebugInfo::CreateCompileUnit for more details.

llvm-svn: 208742

1 files changed, 20 insertions, 0 deletions

diff --git a/clang/test/CodeGen/debug-info-scope-file.c b/clang/test/CodeGen/debug-info-scope-file.c
new file mode 100644
index 00000000000..3479ade7a32
--- /dev/null
+++ b/clang/test/CodeGen/debug-info-scope-file.c
@@ -0,0 +1,20 @@
+// RUN: %clang_cc1 -g -emit-llvm < %s | FileCheck %s
+
+// Check that, just because we emitted a function from a different file doesn't
+// mean we insert a file-change inside the next function.
+
+// CHECK: ret void, !dbg [[F1_LINE:![0-9]*]]
+// CHECK: ret void, !dbg [[F2_LINE:![0-9]*]]
+// CHECK: [[F1:![0-9]*]] = {{.*}} ; [ DW_TAG_subprogram ] {{.*}} [def] [f1]
+// CHECK: [[F2:![0-9]*]] = {{.*}} ; [ DW_TAG_subprogram ] {{.*}} [def] [f2]
+// CHECK: [[F1_LINE]] = {{.*}}, metadata [[F1]], null}
+// CHECK: [[F2_LINE]] = {{.*}}, metadata [[F2]], null}
+
+void f1() {
+}
+
+# 2 "foo.c"
+
+void f2() {
+}
+