MFC 261991:

Upgrade our copy of llvm/clang to 3.4 release.  This version supports
all of the features in the current working draft of the upcoming C++
standard, provisionally named C++1y.

The code generator's performance is greatly increased, and the loop
auto-vectorizer is now enabled at -Os and -O2 in addition to -O3.  The
PowerPC backend has made several major improvements to code generation
quality and compile time, and the X86, SPARC, ARM32, Aarch64 and SystemZ
backends have all seen major feature work.

Release notes for llvm and clang can be found here:
<http://llvm.org/releases/3.4/docs/ReleaseNotes.html>
<http://llvm.org/releases/3.4/tools/clang/docs/ReleaseNotes.html>

MFC 262121 (by emaste):

Update lldb for clang/llvm 3.4 import

This commit largely restores the lldb source to the upstream r196259
snapshot with the addition of threaded inferior support and a few bug
fixes.

Specific upstream lldb revisions restored include:
   SVN      git
  181387  779e6ac
  181703  7bef4e2
  182099  b31044e
  182650  f2dcf35
  182683  0d91b80
  183862  15c1774
  183929  99447a6
  184177  0b2934b
  184948  4dc3761
  184954  007e7bc
  186990  eebd175

Sponsored by:	DARPA, AFRL

MFC 262186 (by emaste):

Fix mismerge in r262121

A break statement was lost in the merge.  The error had no functional
impact, but restore it to reduce the diff against upstream.

MFC 262303:

Pull in r197521 from upstream clang trunk (by rdivacky):

  Use the integrated assembler by default on FreeBSD/ppc and ppc64.

Requested by:	jhibbits

MFC 262611:

Pull in r196874 from upstream llvm trunk:

  Fix a crash that occurs when PWD is invalid.

  MCJIT needs to be able to run in hostile environments, even when PWD
  is invalid. There's no need to crash MCJIT in this case.

  The obvious fix is to simply leave MCContext's CompilationDir empty
  when PWD can't be determined. This way, MCJIT clients,
  and other clients that link with LLVM don't need a valid working directory.

  If we do want to guarantee valid CompilationDir, that should be done
  only for clients of getCompilationDir(). This is as simple as checking
  for an empty string.

  The only current use of getCompilationDir is EmitGenDwarfInfo, which
  won't conceivably run with an invalid working dir. However, in the
  purely hypothetically and untestable case that this happens, the
  AT_comp_dir will be omitted from the compilation_unit DIE.

This should help fix assertions occurring with ports-mgmt/tinderbox,
when it is using jails, and sometimes invalidates clang's current
working directory.

Reported by:	decke

MFC 262809:

Pull in r203007 from upstream clang trunk:

  Don't produce an alias between destructors with different calling conventions.

  Fixes pr19007.

(Please note that is an LLVM PR identifier, not a FreeBSD one.)

This should fix Firefox and/or libxul crashes (due to problems with
regparm/stdcall calling conventions) on i386.

Reported by:	multiple users on freebsd-current
PR:		bin/187103

MFC 263048:

Repair recognition of "CC" as an alias for the C++ compiler, since it
was silently broken by upstream for a Windows-specific use-case.

Apparently some versions of CMake still rely on this archaic feature...

Reported by:	rakuco

MFC 263049:

Garbage collect the old way of adding the libstdc++ include directories
in clang's InitHeaderSearch.cpp.  This has been superseded by David
Chisnall's commit in r255321.

Moreover, if libc++ is used, the libstdc++ include directories should
not be in the search path at all.  These directories are now only used
if you pass -stdlib=libstdc++.

1 files changed, 68 insertions, 38 deletions

diff --git a/contrib/llvm/lib/MC/WinCOFFObjectWriter.cpp b/contrib/llvm/lib/MC/WinCOFFObjectWriter.cpp
index 518b59e..d9ca86d 100644
--- a/contrib/llvm/lib/MC/WinCOFFObjectWriter.cpp
+++ b/contrib/llvm/lib/MC/WinCOFFObjectWriter.cpp
@@ -18,6 +18,7 @@
 #include "llvm/ADT/OwningPtr.h"
 #include "llvm/ADT/StringMap.h"
 #include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/Twine.h"
 #include "llvm/MC/MCAsmLayout.h"
 #include "llvm/MC/MCAssembler.h"
 #include "llvm/MC/MCContext.h"
@@ -137,7 +138,7 @@ public:
   symbol_map  SymbolMap;
 
   WinCOFFObjectWriter(MCWinCOFFObjectTargetWriter *MOTW, raw_ostream &OS);
-  ~WinCOFFObjectWriter();
+  virtual ~WinCOFFObjectWriter();
 
   COFFSymbol *createSymbol(StringRef Name);
   COFFSymbol *GetOrCreateCOFFSymbol(const MCSymbol * Symbol);
@@ -147,13 +148,12 @@ public:
   object_t *createCOFFEntity(StringRef Name, list_t &List);
 
   void DefineSection(MCSectionData const &SectionData);
-  void DefineSymbol(MCSymbolData const &SymbolData,
-                    MCAssembler &Assembler);
+  void DefineSymbol(MCSymbolData const &SymbolData, MCAssembler &Assembler,
+                    const MCAsmLayout &Layout);
 
   void MakeSymbolReal(COFFSymbol &S, size_t Index);
   void MakeSectionReal(COFFSection &S, size_t Number);
 
-  bool ExportSection(COFFSection const *S);
   bool ExportSymbol(MCSymbolData const &SymbolData, MCAssembler &Asm);
 
   bool IsPhysicalSection(COFFSection *S);
@@ -189,17 +189,6 @@ static inline void write_uint32_le(void *Data, uint32_t const &Value) {
   Ptr[3] = (Value & 0xFF000000) >> 24;
 }
 
-static inline void write_uint16_le(void *Data, uint16_t const &Value) {
-  uint8_t *Ptr = reinterpret_cast<uint8_t *>(Data);
-  Ptr[0] = (Value & 0x00FF) >> 0;
-  Ptr[1] = (Value & 0xFF00) >> 8;
-}
-
-static inline void write_uint8_le(void *Data, uint8_t const &Value) {
-  uint8_t *Ptr = reinterpret_cast<uint8_t *>(Data);
-  Ptr[0] = (Value & 0xFF) >> 0;
-}
-
 //------------------------------------------------------------------------------
 // Symbol class implementation
 
@@ -410,7 +399,8 @@ void WinCOFFObjectWriter::DefineSection(MCSectionData const &SectionData) {
 /// This function takes a section data object from the assembler
 /// and creates the associated COFF symbol staging object.
 void WinCOFFObjectWriter::DefineSymbol(MCSymbolData const &SymbolData,
-                                       MCAssembler &Assembler) {
+                                       MCAssembler &Assembler,
+                                       const MCAsmLayout &Layout) {
   MCSymbol const &Symbol = SymbolData.getSymbol();
   COFFSymbol *coff_symbol = GetOrCreateCOFFSymbol(&Symbol);
   SymbolMap[&Symbol] = coff_symbol;
@@ -451,6 +441,12 @@ void WinCOFFObjectWriter::DefineSymbol(MCSymbolData const &SymbolData,
     const MCSymbolData &ResSymData =
       Assembler.getSymbolData(Symbol.AliasedSymbol());
 
+    if (Symbol.isVariable()) {
+      int64_t Addr;
+      if (Symbol.getVariableValue()->EvaluateAsAbsolute(Addr, Layout))
+        coff_symbol->Data.Value = Addr;
+    }
+
     coff_symbol->Data.Type         = (ResSymData.getFlags() & 0x0000FFFF) >>  0;
     coff_symbol->Data.StorageClass = (ResSymData.getFlags() & 0x00FF0000) >> 16;
 
@@ -462,7 +458,9 @@ void WinCOFFObjectWriter::DefineSymbol(MCSymbolData const &SymbolData,
        external ? COFF::IMAGE_SYM_CLASS_EXTERNAL : COFF::IMAGE_SYM_CLASS_STATIC;
     }
 
-    if (ResSymData.Fragment != NULL)
+    if (Symbol.isAbsolute() || Symbol.AliasedSymbol().isVariable())
+      coff_symbol->Data.SectionNumber = COFF::IMAGE_SYM_ABSOLUTE;
+    else if (ResSymData.Fragment != NULL)
       coff_symbol->Section =
         SectionMap[&ResSymData.Fragment->getParent()->getSection()];
 
@@ -474,18 +472,21 @@ void WinCOFFObjectWriter::DefineSymbol(MCSymbolData const &SymbolData,
 /// name into the string table if needed
 void WinCOFFObjectWriter::MakeSectionReal(COFFSection &S, size_t Number) {
   if (S.Name.size() > COFF::NameSize) {
-    size_t StringTableEntry = Strings.insert(S.Name.c_str());
-
-    // FIXME: Why is this number 999999? This number is never mentioned in the
-    // spec. I'm assuming this is due to the printed value needing to fit into
-    // the S.Header.Name field. In which case why not 9999999 (7 9's instead of
-    // 6)? The spec does not state if this entry should be null terminated in
-    // this case, and thus this seems to be the best way to do it. I think I
-    // just solved my own FIXME...
-    if (StringTableEntry > 999999)
-      report_fatal_error("COFF string table is greater than 999999 bytes.");
-
-    std::sprintf(S.Header.Name, "/%d", unsigned(StringTableEntry));
+    const unsigned Max6DecimalSize = 999999;
+    const unsigned Max7DecimalSize = 9999999;
+    uint64_t StringTableEntry = Strings.insert(S.Name.c_str());
+
+    if (StringTableEntry <= Max6DecimalSize) {
+      std::sprintf(S.Header.Name, "/%d", unsigned(StringTableEntry));
+    } else if (StringTableEntry <= Max7DecimalSize) {
+      // With seven digits, we have to skip the terminating null. Because
+      // sprintf always appends it, we use a larger temporary buffer.
+      char buffer[9] = { };
+      std::sprintf(buffer, "/%d", unsigned(StringTableEntry));
+      std::memcpy(S.Header.Name, buffer, 8);
+    } else {
+      report_fatal_error("COFF string table is greater than 9,999,999 bytes.");
+    }
   } else
     std::memcpy(S.Header.Name, S.Name.c_str(), S.Name.size());
 
@@ -504,10 +505,6 @@ void WinCOFFObjectWriter::MakeSymbolReal(COFFSymbol &S, size_t Index) {
   S.Index = Index;
 }
 
-bool WinCOFFObjectWriter::ExportSection(COFFSection const *S) {
-  return !S->MCData->getFragmentList().empty();
-}
-
 bool WinCOFFObjectWriter::ExportSymbol(MCSymbolData const &SymbolData,
                                        MCAssembler &Asm) {
   // This doesn't seem to be right. Strings referred to from the .data section
@@ -621,9 +618,10 @@ void WinCOFFObjectWriter::ExecutePostLayoutBinding(MCAssembler &Asm,
     DefineSection(*i);
 
   for (MCAssembler::const_symbol_iterator i = Asm.symbol_begin(),
-                                          e = Asm.symbol_end(); i != e; i++) {
+                                          e = Asm.symbol_end();
+       i != e; i++) {
     if (ExportSymbol(*i, Asm)) {
-      DefineSymbol(*i, Asm);
+      DefineSymbol(*i, Asm, Layout);
     }
   }
 }
@@ -636,8 +634,9 @@ void WinCOFFObjectWriter::RecordRelocation(const MCAssembler &Asm,
                                            uint64_t &FixedValue) {
   assert(Target.getSymA() != NULL && "Relocation must reference a symbol!");
 
-  const MCSymbol *A = &Target.getSymA()->getSymbol();
-  MCSymbolData &A_SD = Asm.getSymbolData(*A);
+  const MCSymbol &Symbol = Target.getSymA()->getSymbol();
+  const MCSymbol &A = Symbol.AliasedSymbol();
+  MCSymbolData &A_SD = Asm.getSymbolData(A);
 
   MCSectionData const *SectionData = Fragment->getParent();
 
@@ -707,10 +706,13 @@ void WinCOFFObjectWriter::WriteObject(MCAssembler &Asm,
   // Assign symbol and section indexes and offsets.
   Header.NumberOfSections = 0;
 
+  DenseMap<COFFSection *, uint16_t> SectionIndices;
   for (sections::iterator i = Sections.begin(),
                           e = Sections.end(); i != e; i++) {
     if (Layout.getSectionAddressSize((*i)->MCData) > 0) {
-      MakeSectionReal(**i, ++Header.NumberOfSections);
+      size_t Number = ++Header.NumberOfSections;
+      SectionIndices[*i] = Number;
+      MakeSectionReal(**i, Number);
     } else {
       (*i)->Number = -1;
     }
@@ -754,6 +756,31 @@ void WinCOFFObjectWriter::WriteObject(MCAssembler &Asm,
     }
   }
 
+  // Fixup associative COMDAT sections.
+  for (sections::iterator i = Sections.begin(),
+                          e = Sections.end(); i != e; i++) {
+    if ((*i)->Symbol->Aux[0].Aux.SectionDefinition.Selection !=
+        COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE)
+      continue;
+
+    const MCSectionCOFF &MCSec = static_cast<const MCSectionCOFF &>(
+                                                    (*i)->MCData->getSection());
+
+    COFFSection *Assoc = SectionMap.lookup(MCSec.getAssocSection());
+    if (!Assoc) {
+      report_fatal_error(Twine("Missing associated COMDAT section ") +
+                         MCSec.getAssocSection()->getSectionName() +
+                         " for section " + MCSec.getSectionName());
+    }
+
+    // Skip this section if the associated section is unused.
+    if (Assoc->Number == -1)
+      continue;
+
+    (*i)->Symbol->Aux[0].Aux.SectionDefinition.Number = SectionIndices[Assoc];
+  }
+
+
   // Assign file offsets to COFF object file structures.
 
   unsigned offset = 0;
@@ -888,6 +915,9 @@ MCWinCOFFObjectTargetWriter::MCWinCOFFObjectTargetWriter(unsigned Machine_) :
   Machine(Machine_) {
 }
 
+// Pin the vtable to this file.
+void MCWinCOFFObjectTargetWriter::anchor() {}
+
 //------------------------------------------------------------------------------
 // WinCOFFObjectWriter factory function