Support standard DWARF TLS opcode; Darwin and PS4 use it.

[oota-llvm.git] / lib / CodeGen / AsmPrinter / DwarfDebug.cpp

diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index 3527e3f60313519e566beb1843db7cb1827577a9..278907134745ca34eb60e08972cfe2cb5c22ecd0 100644 (file)
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -189,10 +189,11 @@ static LLVM_CONSTEXPR DwarfAccelTable::Atom TypeAtoms[] = {
 
 DwarfDebug::DwarfDebug(AsmPrinter *A, Module *M)
     : Asm(A), MMI(Asm->MMI), PrevLabel(nullptr), GlobalRangeCount(0),
-      InfoHolder(A, *this, "info_string", DIEValueAllocator),
+      InfoHolder(A, "info_string", DIEValueAllocator),
       UsedNonDefaultText(false),
-      SkeletonHolder(A, *this, "skel_string", DIEValueAllocator),
+      SkeletonHolder(A, "skel_string", DIEValueAllocator),
       IsDarwin(Triple(A->getTargetTriple()).isOSDarwin()),
+      IsPS4(Triple(A->getTargetTriple()).isPS4()),
       AccelNames(DwarfAccelTable::Atom(dwarf::DW_ATOM_die_offset,
                                        dwarf::DW_FORM_data4)),
       AccelObjC(DwarfAccelTable::Atom(dwarf::DW_ATOM_die_offset,
@@ -231,6 +232,10 @@ DwarfDebug::DwarfDebug(AsmPrinter *A, Module *M)
   DwarfVersion = DwarfVersionNumber ? DwarfVersionNumber
                                     : MMI->getModule()->getDwarfVersion();
 
+  // Darwin and PS4 use the standard TLS opcode (defined in DWARF 3).
+  // Everybody else uses GNU's.
+  UseGNUTLSOpcode = !(IsDarwin || IsPS4) || DwarfVersion < 3;
+
   Asm->OutStreamer.getContext().setDwarfVersion(DwarfVersion);
 
   {
@@ -477,8 +482,11 @@ void DwarfDebug::beginModule() {
       ScopesWithImportedEntities.push_back(std::make_pair(
           DIImportedEntity(ImportedEntities.getElement(i)).getContext(),
           ImportedEntities.getElement(i)));
-    std::sort(ScopesWithImportedEntities.begin(),
-              ScopesWithImportedEntities.end(), less_first());
+    // Stable sort to preserve the order of appearance of imported entities.
+    // This is to avoid out-of-order processing of interdependent declarations
+    // within the same scope, e.g. { namespace A = base; namespace B = A; }
+    std::stable_sort(ScopesWithImportedEntities.begin(),
+                     ScopesWithImportedEntities.end(), less_first());
     DIArray GVs = CUNode.getGlobalVariables();
     for (unsigned i = 0, e = GVs.getNumElements(); i != e; ++i)
       CU.getOrCreateGlobalVariableDIE(DIGlobalVariable(GVs.getElement(i)));
@@ -1361,49 +1369,6 @@ void DwarfDebug::emitSectionLabels() {
       emitSectionSym(Asm, TLOF.getDwarfRangesSection(), "debug_range");
 }
 
-// Recursively emits a debug information entry.
-void DwarfDebug::emitDIE(DIE &Die) {
-  // Get the abbreviation for this DIE.
-  const DIEAbbrev &Abbrev = Die.getAbbrev();
-
-  // Emit the code (index) for the abbreviation.
-  if (Asm->isVerbose())
-    Asm->OutStreamer.AddComment("Abbrev [" + Twine(Abbrev.getNumber()) +
-                                "] 0x" + Twine::utohexstr(Die.getOffset()) +
-                                ":0x" + Twine::utohexstr(Die.getSize()) + " " +
-                                dwarf::TagString(Abbrev.getTag()));
-  Asm->EmitULEB128(Abbrev.getNumber());
-
-  const SmallVectorImpl<DIEValue *> &Values = Die.getValues();
-  const SmallVectorImpl<DIEAbbrevData> &AbbrevData = Abbrev.getData();
-
-  // Emit the DIE attribute values.
-  for (unsigned i = 0, N = Values.size(); i < N; ++i) {
-    dwarf::Attribute Attr = AbbrevData[i].getAttribute();
-    dwarf::Form Form = AbbrevData[i].getForm();
-    assert(Form && "Too many attributes for DIE (check abbreviation)");
-
-    if (Asm->isVerbose()) {
-      Asm->OutStreamer.AddComment(dwarf::AttributeString(Attr));
-      if (Attr == dwarf::DW_AT_accessibility)
-        Asm->OutStreamer.AddComment(dwarf::AccessibilityString(
-            cast<DIEInteger>(Values[i])->getValue()));
-    }
-
-    // Emit an attribute using the defined form.
-    Values[i]->EmitValue(Asm, Form);
-  }
-
-  // Emit the DIE children if any.
-  if (Abbrev.hasChildren()) {
-    for (auto &Child : Die.getChildren())
-      emitDIE(*Child);
-
-    Asm->OutStreamer.AddComment("End Of Children Mark");
-    Asm->EmitInt8(0);
-  }
-}
-
 // Emit the debug info section.
 void DwarfDebug::emitDebugInfo() {
   DwarfFile &Holder = useSplitDwarf() ? SkeletonHolder : InfoHolder;
@@ -2091,7 +2056,7 @@ static uint64_t makeTypeSignature(StringRef Identifier) {
   // appropriately.
   MD5::MD5Result Result;
   Hash.final(Result);
-  return *reinterpret_cast<support::ulittle64_t *>(Result + 8);
+  return support::endian::read64le(Result + 8);
 }
 
 void DwarfDebug::addDwarfTypeUnitType(DwarfCompileUnit &CU,