Import LLVM 8.0.0 release including clang, lld and lldb.

1 files changed, 31 insertions, 6 deletions

diff --git a/gnu/llvm/lib/MC/ELFObjectWriter.cpp b/gnu/llvm/lib/MC/ELFObjectWriter.cpp
index db531f75c87..ade858113a3 100644
--- a/gnu/llvm/lib/MC/ELFObjectWriter.cpp
+++ b/gnu/llvm/lib/MC/ELFObjectWriter.cpp
@@ -29,6 +29,7 @@
 #include "llvm/MC/MCFixup.h"
 #include "llvm/MC/MCFixupKindInfo.h"
 #include "llvm/MC/MCFragment.h"
+#include "llvm/MC/MCObjectFileInfo.h"
 #include "llvm/MC/MCObjectWriter.h"
 #include "llvm/MC/MCSection.h"
 #include "llvm/MC/MCSectionELF.h"
@@ -668,6 +669,20 @@ void ELFWriter::computeSymbolTable(
     } else {
       const MCSectionELF &Section =
           static_cast<const MCSectionELF &>(Symbol.getSection());
+
+      // We may end up with a situation when section symbol is technically
+      // defined, but should not be. That happens because we explicitly
+      // pre-create few .debug_* sections to have accessors.
+      // And if these sections were not really defined in the code, but were
+      // referenced, we simply error out.
+      if (!Section.isRegistered()) {
+        assert(static_cast<const MCSymbolELF &>(Symbol).getType() ==
+               ELF::STT_SECTION);
+        Ctx.reportError(SMLoc(),
+                        "Undefined section reference: " + Symbol.getName());
+        continue;
+      }
+
       if (Mode == NonDwoOnly && isDwoSection(Section))
         continue;
       MSD.SectionIndex = SectionIndexMap.lookup(&Section);
@@ -1107,6 +1122,8 @@ uint64_t ELFWriter::writeObject(MCAssembler &Asm, const MCAsmLayout &Layout) {
       SectionIndexMap[RelSection] = addToSectionTable(RelSection);
       Relocations.push_back(RelSection);
     }
+
+    OWriter.TargetObjectWriter->addTargetSectionFlags(Ctx, Section);
   }
 
   MCSectionELF *CGProfileSection = nullptr;
@@ -1258,14 +1275,20 @@ void ELFObjectWriter::executePostLayoutBinding(MCAssembler &Asm,
     if (!Symbol.isUndefined() && !Rest.startswith("@@@"))
       continue;
 
-    // FIXME: produce a better error message.
+    // FIXME: Get source locations for these errors or diagnose them earlier.
     if (Symbol.isUndefined() && Rest.startswith("@@") &&
-        !Rest.startswith("@@@"))
-      report_fatal_error("A @@ version cannot be undefined");
+        !Rest.startswith("@@@")) {
+      Asm.getContext().reportError(SMLoc(), "versioned symbol " + AliasName +
+                                                " must be defined");
+      continue;
+    }
 
-    if (Renames.count(&Symbol) && Renames[&Symbol] != Alias)
-      report_fatal_error(llvm::Twine("Multiple symbol versions defined for ") +
-                         Symbol.getName());
+    if (Renames.count(&Symbol) && Renames[&Symbol] != Alias) {
+      Asm.getContext().reportError(
+          SMLoc(), llvm::Twine("multiple symbol versions defined for ") +
+                       Symbol.getName());
+      continue;
+    }
 
     Renames.insert(std::make_pair(&Symbol, Alias));
   }
@@ -1273,6 +1296,8 @@ void ELFObjectWriter::executePostLayoutBinding(MCAssembler &Asm,
   for (const MCSymbol *&Sym : AddrsigSyms) {
     if (const MCSymbol *R = Renames.lookup(cast<MCSymbolELF>(Sym)))
       Sym = R;
+    if (Sym->isInSection() && Sym->getName().startswith(".L"))
+      Sym = Sym->getSection().getBeginSymbol();
     Sym->setUsedInReloc();
   }
 }