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, 310 insertions, 0 deletions

diff --git a/contrib/llvm/lib/MC/MCObjectSymbolizer.cpp b/contrib/llvm/lib/MC/MCObjectSymbolizer.cpp
new file mode 100644
index 0000000..b9131d1
--- /dev/null
+++ b/contrib/llvm/lib/MC/MCObjectSymbolizer.cpp
@@ -0,0 +1,310 @@
+//===-- lib/MC/MCObjectSymbolizer.cpp -------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/MC/MCObjectSymbolizer.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCInst.h"
+#include "llvm/MC/MCRelocationInfo.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/Object/MachO.h"
+#include "llvm/Object/ELFObjectFile.h"
+#include "llvm/Support/raw_ostream.h"
+#include <algorithm>
+
+using namespace llvm;
+using namespace object;
+
+//===- MCMachObjectSymbolizer ---------------------------------------------===//
+
+namespace {
+class MCMachObjectSymbolizer : public MCObjectSymbolizer {
+  const MachOObjectFile *MOOF;
+  // __TEXT;__stubs support.
+  uint64_t StubsStart;
+  uint64_t StubsCount;
+  uint64_t StubSize;
+  uint64_t StubsIndSymIndex;
+
+public:
+  MCMachObjectSymbolizer(MCContext &Ctx, OwningPtr<MCRelocationInfo> &RelInfo,
+                         const MachOObjectFile *MOOF);
+
+  StringRef findExternalFunctionAt(uint64_t Addr) LLVM_OVERRIDE;
+
+  void tryAddingPcLoadReferenceComment(raw_ostream &cStream,
+                                       int64_t Value,
+                                       uint64_t Address) LLVM_OVERRIDE;
+};
+} // End unnamed namespace
+
+
+MCMachObjectSymbolizer::
+MCMachObjectSymbolizer(MCContext &Ctx, OwningPtr<MCRelocationInfo> &RelInfo,
+                       const MachOObjectFile *MOOF)
+    : MCObjectSymbolizer(Ctx, RelInfo, MOOF), MOOF(MOOF),
+      StubsStart(0), StubsCount(0), StubSize(0), StubsIndSymIndex(0) {
+
+  error_code ec;
+  for (section_iterator SI = MOOF->begin_sections(), SE = MOOF->end_sections();
+       SI != SE; SI.increment(ec)) {
+    if (ec) break;
+    StringRef Name; SI->getName(Name);
+    if (Name == "__stubs") {
+      SectionRef StubsSec = *SI;
+      if (MOOF->is64Bit()) {
+        MachO::section_64 S = MOOF->getSection64(StubsSec.getRawDataRefImpl());
+        StubsIndSymIndex = S.reserved1;
+        StubSize = S.reserved2;
+      } else {
+        MachO::section S = MOOF->getSection(StubsSec.getRawDataRefImpl());
+        StubsIndSymIndex = S.reserved1;
+        StubSize = S.reserved2;
+      }
+      assert(StubSize && "Mach-O stub entry size can't be zero!");
+      StubsSec.getAddress(StubsStart);
+      StubsSec.getSize(StubsCount);
+      StubsCount /= StubSize;
+    }
+  }
+}
+
+StringRef MCMachObjectSymbolizer::findExternalFunctionAt(uint64_t Addr) {
+  // FIXME: also, this can all be done at the very beginning, by iterating over
+  // all stubs and creating the calls to outside functions. Is it worth it
+  // though?
+  if (!StubSize)
+    return StringRef();
+  uint64_t StubIdx = (Addr - StubsStart) / StubSize;
+  if (StubIdx >= StubsCount)
+    return StringRef();
+
+  uint32_t SymtabIdx =
+    MOOF->getIndirectSymbolTableEntry(MOOF->getDysymtabLoadCommand(), StubIdx);
+
+  StringRef SymName;
+  symbol_iterator SI = MOOF->begin_symbols();
+  error_code ec;
+  for (uint32_t i = 0; i != SymtabIdx; ++i) {
+    SI.increment(ec);
+  }
+  SI->getName(SymName);
+  assert(SI != MOOF->end_symbols() && "Stub wasn't found in the symbol table!");
+  assert(SymName.front() == '_' && "Mach-O symbol doesn't start with '_'!");
+  return SymName.substr(1);
+}
+
+void MCMachObjectSymbolizer::
+tryAddingPcLoadReferenceComment(raw_ostream &cStream, int64_t Value,
+                                uint64_t Address) {
+  if (const RelocationRef *R = findRelocationAt(Address)) {
+    const MCExpr *RelExpr = RelInfo->createExprForRelocation(*R);
+    if (!RelExpr || RelExpr->EvaluateAsAbsolute(Value) == false)
+      return;
+  }
+  uint64_t Addr = Value;
+  if (const SectionRef *S = findSectionContaining(Addr)) {
+    StringRef Name; S->getName(Name);
+    uint64_t SAddr; S->getAddress(SAddr);
+    if (Name == "__cstring") {
+      StringRef Contents;
+      S->getContents(Contents);
+      Contents = Contents.substr(Addr - SAddr);
+      cStream << " ## literal pool for: "
+              << Contents.substr(0, Contents.find_first_of(0));
+    }
+  }
+}
+
+//===- MCObjectSymbolizer -------------------------------------------------===//
+
+MCObjectSymbolizer::MCObjectSymbolizer(MCContext &Ctx,
+                                       OwningPtr<MCRelocationInfo> &RelInfo,
+                                       const ObjectFile *Obj)
+    : MCSymbolizer(Ctx, RelInfo), Obj(Obj), SortedSections(), AddrToReloc() {
+}
+
+bool MCObjectSymbolizer::
+tryAddingSymbolicOperand(MCInst &MI, raw_ostream &cStream,
+                         int64_t Value, uint64_t Address, bool IsBranch,
+                         uint64_t Offset, uint64_t InstSize) {
+  if (IsBranch) {
+    StringRef ExtFnName = findExternalFunctionAt((uint64_t)Value);
+    if (!ExtFnName.empty()) {
+      MCSymbol *Sym = Ctx.GetOrCreateSymbol(ExtFnName);
+      const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, Ctx);
+      MI.addOperand(MCOperand::CreateExpr(Expr));
+      return true;
+    }
+  }
+
+  if (const RelocationRef *R = findRelocationAt(Address + Offset)) {
+    if (const MCExpr *RelExpr = RelInfo->createExprForRelocation(*R)) {
+      MI.addOperand(MCOperand::CreateExpr(RelExpr));
+      return true;
+    }
+    // Only try to create a symbol+offset expression if there is no relocation.
+    return false;
+  }
+
+  // Interpret Value as a branch target.
+  if (IsBranch == false)
+    return false;
+  uint64_t UValue = Value;
+  // FIXME: map instead of looping each time?
+  error_code ec;
+  for (symbol_iterator SI = Obj->begin_symbols(), SE = Obj->end_symbols();
+       SI != SE; SI.increment(ec)) {
+    if (ec) break;
+    uint64_t SymAddr; SI->getAddress(SymAddr);
+    uint64_t SymSize; SI->getSize(SymSize);
+    StringRef SymName; SI->getName(SymName);
+    SymbolRef::Type SymType; SI->getType(SymType);
+    if (SymAddr == UnknownAddressOrSize || SymSize == UnknownAddressOrSize
+        || SymName.empty() || SymType != SymbolRef::ST_Function)
+      continue;
+
+    if ( SymAddr == UValue ||
+        (SymAddr <= UValue && SymAddr + SymSize > UValue)) {
+      MCSymbol *Sym = Ctx.GetOrCreateSymbol(SymName);
+      const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, Ctx);
+      if (SymAddr != UValue) {
+        const MCExpr *Off = MCConstantExpr::Create(UValue - SymAddr, Ctx);
+        Expr = MCBinaryExpr::CreateAdd(Expr, Off, Ctx);
+      }
+      MI.addOperand(MCOperand::CreateExpr(Expr));
+      return true;
+    }
+  }
+  return false;
+}
+
+void MCObjectSymbolizer::
+tryAddingPcLoadReferenceComment(raw_ostream &cStream,
+                                int64_t Value, uint64_t Address) {
+}
+
+StringRef MCObjectSymbolizer::findExternalFunctionAt(uint64_t Addr) {
+  return StringRef();
+}
+
+MCObjectSymbolizer *
+MCObjectSymbolizer::createObjectSymbolizer(MCContext &Ctx,
+                                           OwningPtr<MCRelocationInfo> &RelInfo,
+                                           const ObjectFile *Obj) {
+  if (const MachOObjectFile *MOOF = dyn_cast<MachOObjectFile>(Obj))
+    return new MCMachObjectSymbolizer(Ctx, RelInfo, MOOF);
+  return new MCObjectSymbolizer(Ctx, RelInfo, Obj);
+}
+
+// SortedSections implementation.
+
+static bool SectionStartsBefore(const SectionRef &S, uint64_t Addr) {
+  uint64_t SAddr; S.getAddress(SAddr);
+  return SAddr < Addr;
+}
+
+const SectionRef *MCObjectSymbolizer::findSectionContaining(uint64_t Addr) {
+  if (SortedSections.empty())
+    buildSectionList();
+
+  SortedSectionList::iterator
+    EndIt = SortedSections.end(),
+    It = std::lower_bound(SortedSections.begin(), EndIt,
+                          Addr, SectionStartsBefore);
+  if (It == EndIt)
+    return 0;
+  uint64_t SAddr; It->getAddress(SAddr);
+  uint64_t SSize; It->getSize(SSize);
+  if (Addr >= SAddr + SSize)
+    return 0;
+  return &*It;
+}
+
+const RelocationRef *MCObjectSymbolizer::findRelocationAt(uint64_t Addr) {
+  if (AddrToReloc.empty())
+    buildRelocationByAddrMap();
+
+  AddrToRelocMap::const_iterator RI = AddrToReloc.find(Addr);
+  if (RI == AddrToReloc.end())
+    return 0;
+  return &RI->second;
+}
+
+void MCObjectSymbolizer::buildSectionList() {
+  error_code ec;
+  for (section_iterator SI = Obj->begin_sections(), SE = Obj->end_sections();
+                        SI != SE; SI.increment(ec)) {
+    if (ec) break;
+
+    bool RequiredForExec; SI->isRequiredForExecution(RequiredForExec);
+    if (RequiredForExec == false)
+      continue;
+    uint64_t SAddr; SI->getAddress(SAddr);
+    uint64_t SSize; SI->getSize(SSize);
+    SortedSectionList::iterator It = std::lower_bound(SortedSections.begin(),
+                                                      SortedSections.end(),
+                                                      SAddr,
+                                                      SectionStartsBefore);
+    if (It != SortedSections.end()) {
+      uint64_t FoundSAddr; It->getAddress(FoundSAddr);
+      if (FoundSAddr < SAddr + SSize)
+        llvm_unreachable("Inserting overlapping sections");
+    }
+    SortedSections.insert(It, *SI);
+  }
+}
+
+void MCObjectSymbolizer::buildRelocationByAddrMap() {
+  error_code ec;
+  for (section_iterator SI = Obj->begin_sections(), SE = Obj->end_sections();
+                        SI != SE; SI.increment(ec)) {
+    if (ec) break;
+
+    section_iterator RelSecI = SI->getRelocatedSection();
+    if (RelSecI == Obj->end_sections())
+      continue;
+
+    uint64_t StartAddr; RelSecI->getAddress(StartAddr);
+    uint64_t Size; RelSecI->getSize(Size);
+    bool RequiredForExec; RelSecI->isRequiredForExecution(RequiredForExec);
+    if (RequiredForExec == false || Size == 0)
+      continue;
+    for (relocation_iterator RI = SI->begin_relocations(),
+                             RE = SI->end_relocations();
+                             RI != RE;
+                             RI.increment(ec)) {
+      if (ec) break;
+      // FIXME: libObject is inconsistent regarding error handling. The
+      // overwhelming majority of methods always return object_error::success,
+      // and assert for simple errors.. Here, ELFObjectFile::getRelocationOffset
+      // asserts when the file type isn't ET_REL.
+      // This workaround handles x86-64 elf, the only one that has a relocinfo.
+      uint64_t Offset;
+      if (Obj->isELF()) {
+        const ELF64LEObjectFile *ELFObj = dyn_cast<ELF64LEObjectFile>(Obj);
+        if (ELFObj == 0)
+          break;
+        if (ELFObj->getELFFile()->getHeader()->e_type == ELF::ET_REL) {
+          RI->getOffset(Offset);
+          Offset += StartAddr;
+        } else {
+          RI->getAddress(Offset);
+        }
+      } else {
+        RI->getOffset(Offset);
+        Offset += StartAddr;
+      }
+      // At a specific address, only keep the first relocation.
+      if (AddrToReloc.find(Offset) == AddrToReloc.end())
+        AddrToReloc[Offset] = *RI;
+    }
+  }
+}