DebugInfo: Move getOrCreateSourceID from DwarfDebug to DwarfCompileUnit

We still do a few lookups into the line table mapping in MCContext that
could be factored out into a single lookup (rather than looking it up
once for the table label, once to set the compilation unit, once for
each time we need a file ID, etc... ) but assembly output complicates
that somewhat as we still need a virtual dispatch back to the
MCAsmStreamer in that case.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204092 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/AsmPrinter/DwarfDebug.cpp

@@ -540,9 +540,9 @@ DIE *DwarfDebug::constructInlinedScopeDIE(DwarfCompileUnit *TheCU,
 
   // Add the call site information to the DIE.
   DILocation DL(Scope->getInlinedAt());
-  TheCU->addUInt(ScopeDIE, dwarf::DW_AT_call_file, None,
-                 getOrCreateSourceID(DL.getFilename(), DL.getDirectory(),
-                                     TheCU->getUniqueID()));
+  TheCU->addUInt(
+      ScopeDIE, dwarf::DW_AT_call_file, None,
+      TheCU->getOrCreateSourceID(DL.getFilename(), DL.getDirectory()));
   TheCU->addUInt(ScopeDIE, dwarf::DW_AT_call_line, None, DL.getLineNumber());
 
   // Add name to the name table, we do this here because we're guaranteed
@@ -665,24 +665,6 @@ DIE *DwarfDebug::constructScopeDIE(DwarfCompileUnit *TheCU,
   return ScopeDIE;
 }
 
-// Look up the source id with the given directory and source file names.
-// If none currently exists, create a new id and insert it in the
-// SourceIds map. This can update DirectoryNames and SourceFileNames maps
-// as well.
-unsigned DwarfDebug::getOrCreateSourceID(StringRef FileName, StringRef DirName,
-                                         unsigned CUID) {
-  // If we print assembly, we can't separate .file entries according to
-  // compile units. Thus all files will belong to the default compile unit.
-
-  // FIXME: add a better feature test than hasRawTextSupport. Even better,
-  // extend .file to support this.
-  if (Asm->OutStreamer.hasRawTextSupport())
-    CUID = 0;
-
-  // Print out a .file directive to specify files for .loc directives.
-  return Asm->OutStreamer.EmitDwarfFileDirective(0, DirName, FileName, CUID);
-}
-
 void DwarfDebug::addGnuPubAttributes(DwarfUnit *U, DIE *D) const {
   if (!GenerateGnuPubSections)
     return;
@@ -1759,8 +1741,9 @@ void DwarfDebug::recordSourceLine(unsigned Line, unsigned Col, const MDNode *S,
     } else
       llvm_unreachable("Unexpected scope info");
 
-    Src = getOrCreateSourceID(
-        Fn, Dir, Asm->OutStreamer.getContext().getDwarfCompileUnitID());
+    unsigned CUID = Asm->OutStreamer.getContext().getDwarfCompileUnitID();
+    Src = static_cast<DwarfCompileUnit *>(InfoHolder.getUnits()[CUID])
+              ->getOrCreateSourceID(Fn, Dir);
   }
   Asm->OutStreamer.EmitDwarfLocDirective(Src, Line, Col, Flags, 0,
                                          Discriminator, Fn);

lib/CodeGen/AsmPrinter/DwarfDebug.h

@@ -737,12 +737,6 @@ public:
     SymSize[Sym] = Size;
   }
 
-  /// \brief Look up the source id with the given directory and source file
-  /// names. If none currently exists, create a new id and insert it in the
-  /// SourceIds map.
-  unsigned getOrCreateSourceID(StringRef DirName, StringRef FullName,
-                               unsigned CUID);
-
   /// \brief Recursively Emits a debug information entry.
   void emitDIE(DIE *Die);
 

lib/CodeGen/AsmPrinter/DwarfUnit.cpp

@@ -296,6 +296,17 @@ void DwarfCompileUnit::addLabelAddress(DIE *Die, dwarf::Attribute Attribute,
   }
 }
 
+unsigned DwarfCompileUnit::getOrCreateSourceID(StringRef FileName, StringRef DirName) {
+  // If we print assembly, we can't separate .file entries according to
+  // compile units. Thus all files will belong to the default compile unit.
+
+  // FIXME: add a better feature test than hasRawTextSupport. Even better,
+  // extend .file to support this.
+  return Asm->OutStreamer.EmitDwarfFileDirective(
+      0, DirName, FileName,
+      Asm->OutStreamer.hasRawTextSupport() ? 0 : getUniqueID());
+}
+
 /// addOpAddress - Add a dwarf op address data and value using the
 /// form given and an op of either DW_FORM_addr or DW_FORM_GNU_addr_index.
 ///
@@ -383,8 +394,7 @@ void DwarfUnit::addSourceLine(DIE *Die, unsigned Line, StringRef File,
   if (Line == 0)
     return;
 
-  unsigned FileID =
-      DD->getOrCreateSourceID(File, Directory, getCU().getUniqueID());
+  unsigned FileID = getCU().getOrCreateSourceID(File, Directory);
   assert(FileID && "Invalid file id");
   addUInt(Die, dwarf::DW_AT_decl_file, None, FileID);
   addUInt(Die, dwarf::DW_AT_decl_line, None, Line);

lib/CodeGen/AsmPrinter/DwarfUnit.h

@@ -602,6 +602,10 @@ public:
   void addLabelAddress(DIE *Die, dwarf::Attribute Attribute, MCSymbol *Label);
 
   DwarfCompileUnit &getCU() override { return *this; }
+
+  /// Look up the source ID with the given directory and source file names. If
+  /// none currently exists, create a new ID and insert it in the line table.
+  unsigned getOrCreateSourceID(StringRef FileName, StringRef DirName);
 };
 
 class DwarfTypeUnit : public DwarfUnit {