[DWARFv5] CodeGen support for MD5 file checksums

Pass MD5 checksums through from IR to assembly/object files.
After this, getting Clang to compute the MD5 should be the last step
to supporting MD5 in the DWARF v5 line table header.

Differential Revision: https://reviews.llvm.org/D41926

llvm-svn: 322391

1 files changed, 7 insertions, 9 deletions

diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp b/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
index 0443bde0cf2..e77e8d9b354 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
@@ -94,17 +94,17 @@ void DwarfCompileUnit::addLocalLabelAddress(DIE &Die,
                  DIEInteger(0));
 }
 
-unsigned DwarfCompileUnit::getOrCreateSourceID(StringRef FileName,
-                                               StringRef DirName,
-                                               MD5::MD5Result *Checksum) {
+unsigned DwarfCompileUnit::getOrCreateSourceID(const DIFile *File) {
   // 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.
+  unsigned CUID = Asm->OutStreamer->hasRawTextSupport() ? 0 : getUniqueID();
+  if (!File)
+    return Asm->OutStreamer->EmitDwarfFileDirective(0, "", "", nullptr, CUID);
   return Asm->OutStreamer->EmitDwarfFileDirective(
-      0, DirName, FileName, Checksum,
-      Asm->OutStreamer->hasRawTextSupport() ? 0 : getUniqueID());
+      0, File->getDirectory(), File->getFilename(), getMD5AsBytes(File), CUID);
 }
 
 DIE *DwarfCompileUnit::getOrCreateGlobalVariableDIE(
@@ -444,7 +444,7 @@ DIE *DwarfCompileUnit::constructInlinedScopeDIE(LexicalScope *Scope) {
   // Add the call site information to the DIE.
   const DILocation *IA = Scope->getInlinedAt();
   addUInt(*ScopeDIE, dwarf::DW_AT_call_file, None,
-          getOrCreateSourceID(IA->getFilename(), IA->getDirectory(), nullptr));
+          getOrCreateSourceID(IA->getFile()));
   addUInt(*ScopeDIE, dwarf::DW_AT_call_line, None, IA->getLine());
   if (IA->getDiscriminator() && DD->getDwarfVersion() >= 4)
     addUInt(*ScopeDIE, dwarf::DW_AT_GNU_discriminator, None,
@@ -688,9 +688,7 @@ DIE *DwarfCompileUnit::constructImportedEntityDIE(
   else
     EntityDie = getDIE(Entity);
   assert(EntityDie);
-  auto *File = Module->getFile();
-  addSourceLine(*IMDie, Module->getLine(), File ? File->getFilename() : "",
-                File ? File->getDirectory() : "");
+  addSourceLine(*IMDie, Module->getLine(), Module->getFile());
   addDIEEntry(*IMDie, dwarf::DW_AT_import, *EntityDie);
   StringRef Name = Module->getName();
   if (!Name.empty())