do not use compiler.getSourceManager().getFilename()

This is a continuation of ff002524c12471668e63837a804b6006f9136a34.
When compiling with icecream, its -frewrite-includes merges
all #include's into one .cxx file and marks them with with line
markers. But SourceManager::getFilename() doesn't take those
into account and so it reports all of those as <stdin>.
So use getFileNameOfSpellingLoc(), which explicitly handles this
case.
And we should probably never ever use SourceManager::getFilename().

Change-Id: Ia194c2e041578e1e199aee2df2f885922ef7e31a
Reviewed-on: https://gerrit.libreoffice.org/80326
Tested-by: Jenkins
Reviewed-by: Luboš Luňák <l.lunak@collabora.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/compilerplugins/clang/constantparam.cxx b/compilerplugins/clang/constantparam.cxx
index f1257dbb0e96..33e25909c681 100644
--- a/compilerplugins/clang/constantparam.cxx
+++ b/compilerplugins/clang/constantparam.cxx
@@ -121,7 +121,7 @@ void ConstantParam::addToCallSet(const FunctionDecl* functionDecl, int paramInde
     if (isInUnoIncludeFile(functionDecl))
         return;
     SourceLocation expansionLoc = compiler.getSourceManager().getExpansionLoc( functionDecl->getLocation() );
-    StringRef filename = compiler.getSourceManager().getFilename(expansionLoc);
+    StringRef filename = getFileNameOfSpellingLoc(expansionLoc);
     if (!loplugin::hasPathnamePrefix(filename, SRCDIR "/"))
         return;
     filename = filename.substr(strlen(SRCDIR)+1);