Reapply "[DWARFv5] Emit file 0 to the line table."

DWARF v5 specifies that the root file (also given in the DW_AT_name
attribute of the compilation unit DIE) should be emitted explicitly to
the line table's list of files.  This makes the line table more
independent of the .debug_info section.
We emit the new syntax only for DWARF v5 and later.

Fixes the bug found by asan. Also XFAIL the new test for Darwin, which
is stuck on DWARF v2, and fix up other tests so they stop failing on
Windows.  Last but not least, don't break "clang -g" of an assembler
file that has .file directives in it.

Differential Revision: https://reviews.llvm.org/D44054

llvm-svn: 328805

1 files changed, 34 insertions, 27 deletions

diff --git a/llvm/lib/MC/MCDwarf.cpp b/llvm/lib/MC/MCDwarf.cpp
index 2da69fe..0e0ea96 100644
--- a/llvm/lib/MC/MCDwarf.cpp
+++ b/llvm/lib/MC/MCDwarf.cpp
@@ -349,6 +349,34 @@ void MCDwarfLineTableHeader::emitV2FileDirTables(MCStreamer *MCOS) const {
   MCOS->EmitIntValue(0, 1); // Terminate the file list.
 }
 
+static void emitOneV5FileEntry(MCStreamer *MCOS, const MCDwarfFile &DwarfFile,
+                               bool HasMD5, bool HasSource,
+                               Optional<MCDwarfLineStr> &LineStr) {
+  assert(!DwarfFile.Name.empty());
+  if (LineStr)
+    LineStr->emitRef(MCOS, DwarfFile.Name);
+  else {
+    MCOS->EmitBytes(DwarfFile.Name);     // FileName and...
+    MCOS->EmitBytes(StringRef("\0", 1)); // its null terminator.
+  }
+  MCOS->EmitULEB128IntValue(DwarfFile.DirIndex); // Directory number.
+  if (HasMD5) {
+    MD5::MD5Result *Cksum = DwarfFile.Checksum;
+    MCOS->EmitBinaryData(
+        StringRef(reinterpret_cast<const char *>(Cksum->Bytes.data()),
+                  Cksum->Bytes.size()));
+  }
+  if (HasSource) {
+    if (LineStr)
+      LineStr->emitRef(MCOS, DwarfFile.Source.getValueOr(StringRef()));
+    else {
+      MCOS->EmitBytes(
+          DwarfFile.Source.getValueOr(StringRef())); // Source and...
+      MCOS->EmitBytes(StringRef("\0", 1));           // its null terminator.
+    }
+  }
+}
+
 void MCDwarfLineTableHeader::emitV5FileDirTables(
     MCStreamer *MCOS, Optional<MCDwarfLineStr> &LineStr) const {
   // The directory format, which is just a list of the directory paths.  In a
@@ -397,33 +425,12 @@ void MCDwarfLineTableHeader::emitV5FileDirTables(
     MCOS->EmitULEB128IntValue(LineStr ? dwarf::DW_FORM_line_strp
                                       : dwarf::DW_FORM_string);
   }
-  // Then the list of file names. These start at 1.
-  MCOS->EmitULEB128IntValue(MCDwarfFiles.size() - 1);
-  for (unsigned i = 1; i < MCDwarfFiles.size(); ++i) {
-    assert(!MCDwarfFiles[i].Name.empty());
-    if (LineStr)
-      LineStr->emitRef(MCOS, MCDwarfFiles[i].Name);
-    else {
-      MCOS->EmitBytes(MCDwarfFiles[i].Name); // FileName and...
-      MCOS->EmitBytes(StringRef("\0", 1));   // its null terminator.
-    }
-    MCOS->EmitULEB128IntValue(MCDwarfFiles[i].DirIndex); // Directory number.
-    if (HasMD5) {
-      MD5::MD5Result *Cksum = MCDwarfFiles[i].Checksum;
-      MCOS->EmitBinaryData(
-          StringRef(reinterpret_cast<const char *>(Cksum->Bytes.data()),
-                    Cksum->Bytes.size()));
-    }
-    if (HasSource) {
-      if (LineStr)
-        LineStr->emitRef(MCOS, MCDwarfFiles[i].Source.getValueOr(StringRef()));
-      else {
-        MCOS->EmitBytes(
-            MCDwarfFiles[i].Source.getValueOr(StringRef())); // Source and...
-        MCOS->EmitBytes(StringRef("\0", 1)); // its null terminator.
-      }
-    }
-  }
+  // Then the counted list of files. The root file is file #0, then emit the
+  // files as provide by .file directives.
+  MCOS->EmitULEB128IntValue(MCDwarfFiles.size());
+  emitOneV5FileEntry(MCOS, RootFile, HasMD5, HasSource, LineStr);
+  for (unsigned i = 1; i < MCDwarfFiles.size(); ++i)
+    emitOneV5FileEntry(MCOS, MCDwarfFiles[i], HasMD5, HasSource, LineStr);
 }
 
 std::pair<MCSymbol *, MCSymbol *>