Fix segmentation fault when mixing -Rpass with #line.

Summary:
When using #line directives, FileManager::getFile() will return a nil
entry. This triggers an assert in translateFileLineCol().

This patch handles nil FileEntry instances by emitting a note that the
location could not be translated back to a SourceLocation. I don't
really like this solution, but we are translating presumed locations,
so some information has already been lost.

Reviewers: rsmith

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D3625

llvm-svn: 208315

1 files changed, 15 insertions, 0 deletions

diff --git a/clang/test/Frontend/optimization-remark-line-directive.c b/clang/test/Frontend/optimization-remark-line-directive.c
new file mode 100644
index 00000000000..b4b1b923249
--- /dev/null
+++ b/clang/test/Frontend/optimization-remark-line-directive.c
@@ -0,0 +1,15 @@
+// This file tests -Rpass diagnostics together with #line
+// directives. We cannot map #line directives back to
+// a SourceLocation.
+
+// RUN: %clang -c %s -Rpass=inline -O0 -S -gmlt -o /dev/null 2> %t.err
+// RUN: FileCheck < %t.err %s --check-prefix=INLINE-INVALID-LOC
+//
+int foo(int x, int y) __attribute__((always_inline));
+int foo(int x, int y) { return x + y; }
+
+#line 1230 "/bad/path/to/original.c"
+int bar(int j) { return foo(j, j - 2); }
+
+// INLINE-INVALID-LOC: {{^remark: foo inlined into bar}}
+// INLINE-INVALID-LOC: note: could not determine the original source location for /bad/path/to/original.c:1230:0