CodeGen: Use the source filename as the argument to .file, rather than the module ID.

Using the module ID here is wrong for a couple of reasons:
1) The module ID is not persisted, so we can end up with different
   object file contents given the same input file (for example if the same
   file is accessed via different paths).
2) With ThinLTO the module ID field may contain the path to a bitcode file,
   which is incorrect, as the .file argument is supposed to contain the path to
   a source file.

Differential Revision: https://reviews.llvm.org/D30584

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@297853 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
index f02062b7377c9c293577305895b03a96614184a2..fb6fa4df0b75f26c9a507b58f091bb5dca242151 100644 (file)
--- a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -267,7 +267,7 @@ bool AsmPrinter::doInitialization(Module &M) {
   // don't, this at least helps the user find where a global came from.
   if (MAI->hasSingleParameterDotFile()) {
     // .file "foo.c"
-    OutStreamer->EmitFileDirective(M.getModuleIdentifier());
+    OutStreamer->EmitFileDirective(M.getSourceFileName());
   }
 
   GCModuleInfo *MI = getAnalysisIfAvailable<GCModuleInfo>();

diff --git a/test/CodeGen/X86/file-source-filename.ll b/test/CodeGen/X86/file-source-filename.ll
new file mode 100644 (file)
index 0000000..146da9e
--- /dev/null
+++ b/test/CodeGen/X86/file-source-filename.ll
@@ -0,0 +1,4 @@
+; RUN: llc -mtriple=x86_64-linux-gnu < %s | FileCheck %s
+; CHECK: .file "foobar"
+
+source_filename = "foobar"