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, 26 insertions, 30 deletions

diff --git a/contrib/llvm/lib/CodeGen/LiveRangeCalc.cpp b/contrib/llvm/lib/CodeGen/LiveRangeCalc.cpp
index dede490..ae086bc 100644
--- a/contrib/llvm/lib/CodeGen/LiveRangeCalc.cpp
+++ b/contrib/llvm/lib/CodeGen/LiveRangeCalc.cpp
@@ -36,11 +36,11 @@ void LiveRangeCalc::reset(const MachineFunction *mf,
 }
 
 
-void LiveRangeCalc::createDeadDefs(LiveInterval *LI, unsigned Reg) {
+void LiveRangeCalc::createDeadDefs(LiveRange &LR, unsigned Reg) {
   assert(MRI && Indexes && "call reset() first");
 
   // Visit all def operands. If the same instruction has multiple defs of Reg,
-  // LI->createDeadDef() will deduplicate.
+  // LR.createDeadDef() will deduplicate.
   for (MachineRegisterInfo::def_iterator
        I = MRI->def_begin(Reg), E = MRI->def_end(); I != E; ++I) {
     const MachineInstr *MI = &*I;
@@ -54,13 +54,13 @@ void LiveRangeCalc::createDeadDefs(LiveInterval *LI, unsigned Reg) {
       Idx = Indexes->getInstructionIndex(MI)
         .getRegSlot(I.getOperand().isEarlyClobber());
 
-    // Create the def in LI. This may find an existing def.
-    LI->createDeadDef(Idx, *Alloc);
+    // Create the def in LR. This may find an existing def.
+    LR.createDeadDef(Idx, *Alloc);
   }
 }
 
 
-void LiveRangeCalc::extendToUses(LiveInterval *LI, unsigned Reg) {
+void LiveRangeCalc::extendToUses(LiveRange &LR, unsigned Reg) {
   assert(MRI && Indexes && "call reset() first");
 
   // Visit all operands that read Reg. This may include partial defs.
@@ -99,7 +99,7 @@ void LiveRangeCalc::extendToUses(LiveInterval *LI, unsigned Reg) {
           Idx = Idx.getRegSlot(true);
       }
     }
-    extend(LI, Idx, Reg);
+    extend(LR, Idx, Reg);
   }
 }
 
@@ -125,17 +125,14 @@ void LiveRangeCalc::updateLiveIns() {
       assert(Seen.test(MBB->getNumber()));
       LiveOut[MBB] = LiveOutPair(I->Value, (MachineDomTreeNode *)0);
     }
-    Updater.setDest(I->LI);
+    Updater.setDest(&I->LR);
     Updater.add(Start, End, I->Value);
   }
   LiveIn.clear();
 }
 
 
-void LiveRangeCalc::extend(LiveInterval *LI,
-                           SlotIndex Kill,
-                           unsigned PhysReg) {
-  assert(LI && "Missing live range");
+void LiveRangeCalc::extend(LiveRange &LR, SlotIndex Kill, unsigned PhysReg) {
   assert(Kill.isValid() && "Invalid SlotIndex");
   assert(Indexes && "Missing SlotIndexes");
   assert(DomTree && "Missing dominator tree");
@@ -144,14 +141,14 @@ void LiveRangeCalc::extend(LiveInterval *LI,
   assert(KillMBB && "No MBB at Kill");
 
   // Is there a def in the same MBB we can extend?
-  if (LI->extendInBlock(Indexes->getMBBStartIdx(KillMBB), Kill))
+  if (LR.extendInBlock(Indexes->getMBBStartIdx(KillMBB), Kill))
     return;
 
   // Find the single reaching def, or determine if Kill is jointly dominated by
   // multiple values, and we may need to create even more phi-defs to preserve
   // VNInfo SSA form.  Perform a search for all predecessor blocks where we
   // know the dominating VNInfo.
-  if (findReachingDefs(LI, KillMBB, Kill, PhysReg))
+  if (findReachingDefs(LR, *KillMBB, Kill, PhysReg))
     return;
 
   // When there were multiple different values, we may need new PHIs.
@@ -170,13 +167,11 @@ void LiveRangeCalc::calculateValues() {
 }
 
 
-bool LiveRangeCalc::findReachingDefs(LiveInterval *LI,
-                                     MachineBasicBlock *KillMBB,
-                                     SlotIndex Kill,
-                                     unsigned PhysReg) {
-  unsigned KillMBBNum = KillMBB->getNumber();
+bool LiveRangeCalc::findReachingDefs(LiveRange &LR, MachineBasicBlock &KillMBB,
+                                     SlotIndex Kill, unsigned PhysReg) {
+  unsigned KillMBBNum = KillMBB.getNumber();
 
-  // Block numbers where LI should be live-in.
+  // Block numbers where LR should be live-in.
   SmallVector<unsigned, 16> WorkList(1, KillMBBNum);
 
   // Remember if we have seen more than one value.
@@ -203,7 +198,7 @@ bool LiveRangeCalc::findReachingDefs(LiveInterval *LI,
 #endif
 
     for (MachineBasicBlock::pred_iterator PI = MBB->pred_begin(),
-           PE = MBB->pred_end(); PI != PE; ++PI) {
+         PE = MBB->pred_end(); PI != PE; ++PI) {
        MachineBasicBlock *Pred = *PI;
 
        // Is this a known live-out block?
@@ -221,7 +216,7 @@ bool LiveRangeCalc::findReachingDefs(LiveInterval *LI,
 
        // First time we see Pred.  Try to determine the live-out value, but set
        // it as null if Pred is live-through with an unknown value.
-       VNInfo *VNI = LI->extendInBlock(Start, End);
+       VNInfo *VNI = LR.extendInBlock(Start, End);
        setLiveOutValue(Pred, VNI);
        if (VNI) {
          if (TheVNI && TheVNI != VNI)
@@ -231,7 +226,7 @@ bool LiveRangeCalc::findReachingDefs(LiveInterval *LI,
        }
 
        // No, we need a live-in value for Pred as well
-       if (Pred != KillMBB)
+       if (Pred != &KillMBB)
           WorkList.push_back(Pred->getNumber());
        else
           // Loopback to KillMBB, so value is really live through.
@@ -248,9 +243,9 @@ bool LiveRangeCalc::findReachingDefs(LiveInterval *LI,
 
   // If a unique reaching def was found, blit in the live ranges immediately.
   if (UniqueVNI) {
-    LiveRangeUpdater Updater(LI);
-    for (SmallVectorImpl<unsigned>::const_iterator
-         I = WorkList.begin(), E = WorkList.end(); I != E; ++I) {
+    LiveRangeUpdater Updater(&LR);
+    for (SmallVectorImpl<unsigned>::const_iterator I = WorkList.begin(),
+         E = WorkList.end(); I != E; ++I) {
        SlotIndex Start, End;
        tie(Start, End) = Indexes->getMBBRange(*I);
        // Trim the live range in KillMBB.
@@ -270,8 +265,8 @@ bool LiveRangeCalc::findReachingDefs(LiveInterval *LI,
   for (SmallVectorImpl<unsigned>::const_iterator
        I = WorkList.begin(), E = WorkList.end(); I != E; ++I) {
     MachineBasicBlock *MBB = MF->getBlockNumbered(*I);
-    addLiveInBlock(LI, DomTree->getNode(MBB));
-    if (MBB == KillMBB)
+    addLiveInBlock(LR, DomTree->getNode(MBB));
+    if (MBB == &KillMBB)
       LiveIn.back().Kill = Kill;
   }
 
@@ -348,16 +343,17 @@ void LiveRangeCalc::updateSSA() {
         assert(Alloc && "Need VNInfo allocator to create PHI-defs");
         SlotIndex Start, End;
         tie(Start, End) = Indexes->getMBBRange(MBB);
-        VNInfo *VNI = I->LI->getNextValue(Start, *Alloc);
+        LiveRange &LR = I->LR;
+        VNInfo *VNI = LR.getNextValue(Start, *Alloc);
         I->Value = VNI;
         // This block is done, we know the final value.
         I->DomNode = 0;
 
         // Add liveness since updateLiveIns now skips this node.
         if (I->Kill.isValid())
-          I->LI->addRange(LiveRange(Start, I->Kill, VNI));
+          LR.addSegment(LiveInterval::Segment(Start, I->Kill, VNI));
         else {
-          I->LI->addRange(LiveRange(Start, End, VNI));
+          LR.addSegment(LiveInterval::Segment(Start, End, VNI));
           LOP = LiveOutPair(VNI, Node);
         }
       } else if (IDomValue.first) {