Add support for a new extension to the .file directive:

  .file filenumber "directory" "filename"

This removes one join+split of the directory+filename in MC internals. Because
bitcode files have independent fields for directory and filenames in debug info,
this patch may change the .o files written by existing .bc files.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142300 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 17 insertions, 18 deletions

diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index 1b7e370..9978c82 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -442,23 +442,21 @@ unsigned DwarfDebug::GetOrCreateSourceID(StringRef FileName,
   if (FileName.empty())
     return GetOrCreateSourceID("<stdin>", StringRef());
 
-  // MCStream expects full path name as filename.
-  if (!DirName.empty() && !sys::path::is_absolute(FileName)) {
-    SmallString<128> FullPathName = DirName;
-    sys::path::append(FullPathName, FileName);
-    // Here FullPathName will be copied into StringMap by GetOrCreateSourceID.
-    return GetOrCreateSourceID(StringRef(FullPathName), StringRef());
-  }
-
-  StringMapEntry<unsigned> &Entry = SourceIdMap.GetOrCreateValue(FileName);
-  if (Entry.getValue())
-    return Entry.getValue();
-
-  unsigned SrcId = SourceIdMap.size();
-  Entry.setValue(SrcId);
+  unsigned SrcId = SourceIdMap.size()+1;
+  std::pair<std::string, std::string> SourceName =
+      std::make_pair(FileName, DirName);
+  std::pair<std::pair<std::string, std::string>, unsigned> Entry =
+      make_pair(SourceName, SrcId);
+
+  std::map<std::pair<std::string, std::string>, unsigned>::iterator I;
+  bool NewlyInserted;
+  tie(I, NewlyInserted) = SourceIdMap.insert(Entry);
+  if (!NewlyInserted)
+    return I->second;
 
   // Print out a .file directive to specify files for .loc directives.
-  Asm->OutStreamer.EmitDwarfFileDirective(SrcId, Entry.getKey());
+  Asm->OutStreamer.EmitDwarfFileDirective(SrcId, Entry.first.second,
+                                          Entry.first.first);
 
   return SrcId;
 }
diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.h b/lib/CodeGen/AsmPrinter/DwarfDebug.h
index 35653be..faa78f3 100644
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.h
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.h
@@ -26,6 +26,7 @@
 #include "llvm/ADT/UniqueVector.h"
 #include "llvm/Support/Allocator.h"
 #include "llvm/Support/DebugLoc.h"
+#include <map>
 
 namespace llvm {
 
@@ -207,9 +208,9 @@ class DwarfDebug {
   ///
   std::vector<DIEAbbrev *> Abbreviations;
 
-  /// SourceIdMap - Source id map, i.e. pair of directory id and source file
-  /// id mapped to a unique id.
-  StringMap<unsigned> SourceIdMap;
+  /// SourceIdMap - Source id map, i.e. pair of source filename and directory
+  /// mapped to a unique id.
+  std::map<std::pair<std::string, std::string>, unsigned> SourceIdMap;
 
   /// StringPool - A String->Symbol mapping of strings used by indirect
   /// references.