vendor/llvm/llvm-release_350-r216957

1 files changed, 360 insertions, 50 deletions

diff --git a/include/llvm/CodeGen/MachineRegisterInfo.h b/include/llvm/CodeGen/MachineRegisterInfo.h
index 58ca907316ac..51139f72ba22 100644
--- a/include/llvm/CodeGen/MachineRegisterInfo.h
+++ b/include/llvm/CodeGen/MachineRegisterInfo.h
@@ -16,6 +16,7 @@
 
 #include "llvm/ADT/BitVector.h"
 #include "llvm/ADT/IndexedMap.h"
+#include "llvm/ADT/iterator_range.h"
 #include "llvm/CodeGen/MachineInstrBundle.h"
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/Target/TargetRegisterInfo.h"
@@ -134,7 +135,7 @@ public:
     // notifications, we will need to change to using a list.
     assert(TheDelegate == delegate &&
            "Only the current delegate can perform reset!");
-    TheDelegate = 0;
+    TheDelegate = nullptr;
   }
 
   void setDelegate(Delegate *delegate) {
@@ -200,19 +201,66 @@ public:
   /// reg_begin/reg_end - Provide iteration support to walk over all definitions
   /// and uses of a register within the MachineFunction that corresponds to this
   /// MachineRegisterInfo object.
-  template<bool Uses, bool Defs, bool SkipDebug>
+  template<bool Uses, bool Defs, bool SkipDebug,
+           bool ByOperand, bool ByInstr, bool ByBundle>
   class defusechain_iterator;
+  template<bool Uses, bool Defs, bool SkipDebug,
+           bool ByOperand, bool ByInstr, bool ByBundle>
+  class defusechain_instr_iterator;
 
   // Make it a friend so it can access getNextOperandForReg().
-  template<bool, bool, bool> friend class defusechain_iterator;
+  template<bool, bool, bool, bool, bool, bool>
+    friend class defusechain_iterator;
+  template<bool, bool, bool, bool, bool, bool>
+    friend class defusechain_instr_iterator;
+
+
 
   /// reg_iterator/reg_begin/reg_end - Walk all defs and uses of the specified
   /// register.
-  typedef defusechain_iterator<true,true,false> reg_iterator;
+  typedef defusechain_iterator<true,true,false,true,false,false>
+          reg_iterator;
   reg_iterator reg_begin(unsigned RegNo) const {
     return reg_iterator(getRegUseDefListHead(RegNo));
   }
-  static reg_iterator reg_end() { return reg_iterator(0); }
+  static reg_iterator reg_end() { return reg_iterator(nullptr); }
+
+  inline iterator_range<reg_iterator>  reg_operands(unsigned Reg) const {
+    return iterator_range<reg_iterator>(reg_begin(Reg), reg_end());
+  }
+
+  /// reg_instr_iterator/reg_instr_begin/reg_instr_end - Walk all defs and uses
+  /// of the specified register, stepping by MachineInstr.
+  typedef defusechain_instr_iterator<true,true,false,false,true,false>
+          reg_instr_iterator;
+  reg_instr_iterator reg_instr_begin(unsigned RegNo) const {
+    return reg_instr_iterator(getRegUseDefListHead(RegNo));
+  }
+  static reg_instr_iterator reg_instr_end() {
+    return reg_instr_iterator(nullptr);
+  }
+
+  inline iterator_range<reg_instr_iterator>
+  reg_instructions(unsigned Reg) const {
+    return iterator_range<reg_instr_iterator>(reg_instr_begin(Reg),
+                                              reg_instr_end());
+  }
+
+  /// reg_bundle_iterator/reg_bundle_begin/reg_bundle_end - Walk all defs and uses
+  /// of the specified register, stepping by bundle.
+  typedef defusechain_instr_iterator<true,true,false,false,false,true>
+          reg_bundle_iterator;
+  reg_bundle_iterator reg_bundle_begin(unsigned RegNo) const {
+    return reg_bundle_iterator(getRegUseDefListHead(RegNo));
+  }
+  static reg_bundle_iterator reg_bundle_end() {
+    return reg_bundle_iterator(nullptr);
+  }
+
+  inline iterator_range<reg_bundle_iterator> reg_bundles(unsigned Reg) const {
+    return iterator_range<reg_bundle_iterator>(reg_bundle_begin(Reg),
+                                               reg_bundle_end());
+  }
 
   /// reg_empty - Return true if there are no instructions using or defining the
   /// specified register (it may be live-in).
@@ -220,11 +268,56 @@ public:
 
   /// reg_nodbg_iterator/reg_nodbg_begin/reg_nodbg_end - Walk all defs and uses
   /// of the specified register, skipping those marked as Debug.
-  typedef defusechain_iterator<true,true,true> reg_nodbg_iterator;
+  typedef defusechain_iterator<true,true,true,true,false,false>
+          reg_nodbg_iterator;
   reg_nodbg_iterator reg_nodbg_begin(unsigned RegNo) const {
     return reg_nodbg_iterator(getRegUseDefListHead(RegNo));
   }
-  static reg_nodbg_iterator reg_nodbg_end() { return reg_nodbg_iterator(0); }
+  static reg_nodbg_iterator reg_nodbg_end() {
+    return reg_nodbg_iterator(nullptr);
+  }
+
+  inline iterator_range<reg_nodbg_iterator>
+  reg_nodbg_operands(unsigned Reg) const {
+    return iterator_range<reg_nodbg_iterator>(reg_nodbg_begin(Reg),
+                                              reg_nodbg_end());
+  }
+
+  /// reg_instr_nodbg_iterator/reg_instr_nodbg_begin/reg_instr_nodbg_end - Walk
+  /// all defs and uses of the specified register, stepping by MachineInstr,
+  /// skipping those marked as Debug.
+  typedef defusechain_instr_iterator<true,true,true,false,true,false>
+          reg_instr_nodbg_iterator;
+  reg_instr_nodbg_iterator reg_instr_nodbg_begin(unsigned RegNo) const {
+    return reg_instr_nodbg_iterator(getRegUseDefListHead(RegNo));
+  }
+  static reg_instr_nodbg_iterator reg_instr_nodbg_end() {
+    return reg_instr_nodbg_iterator(nullptr);
+  }
+
+  inline iterator_range<reg_instr_nodbg_iterator>
+  reg_nodbg_instructions(unsigned Reg) const {
+    return iterator_range<reg_instr_nodbg_iterator>(reg_instr_nodbg_begin(Reg),
+                                                    reg_instr_nodbg_end());
+  }
+
+  /// reg_bundle_nodbg_iterator/reg_bundle_nodbg_begin/reg_bundle_nodbg_end - Walk
+  /// all defs and uses of the specified register, stepping by bundle,
+  /// skipping those marked as Debug.
+  typedef defusechain_instr_iterator<true,true,true,false,false,true>
+          reg_bundle_nodbg_iterator;
+  reg_bundle_nodbg_iterator reg_bundle_nodbg_begin(unsigned RegNo) const {
+    return reg_bundle_nodbg_iterator(getRegUseDefListHead(RegNo));
+  }
+  static reg_bundle_nodbg_iterator reg_bundle_nodbg_end() {
+    return reg_bundle_nodbg_iterator(nullptr);
+  }
+
+  inline iterator_range<reg_bundle_nodbg_iterator> 
+  reg_nodbg_bundles(unsigned Reg) const {
+    return iterator_range<reg_bundle_nodbg_iterator>(reg_bundle_nodbg_begin(Reg),
+                                                     reg_bundle_nodbg_end());
+  }
 
   /// reg_nodbg_empty - Return true if the only instructions using or defining
   /// Reg are Debug instructions.
@@ -233,11 +326,49 @@ public:
   }
 
   /// def_iterator/def_begin/def_end - Walk all defs of the specified register.
-  typedef defusechain_iterator<false,true,false> def_iterator;
+  typedef defusechain_iterator<false,true,false,true,false,false>
+          def_iterator;
   def_iterator def_begin(unsigned RegNo) const {
     return def_iterator(getRegUseDefListHead(RegNo));
   }
-  static def_iterator def_end() { return def_iterator(0); }
+  static def_iterator def_end() { return def_iterator(nullptr); }
+
+  inline iterator_range<def_iterator> def_operands(unsigned Reg) const {
+    return iterator_range<def_iterator>(def_begin(Reg), def_end());
+  }
+
+  /// def_instr_iterator/def_instr_begin/def_instr_end - Walk all defs of the
+  /// specified register, stepping by MachineInst.
+  typedef defusechain_instr_iterator<false,true,false,false,true,false>
+          def_instr_iterator;
+  def_instr_iterator def_instr_begin(unsigned RegNo) const {
+    return def_instr_iterator(getRegUseDefListHead(RegNo));
+  }
+  static def_instr_iterator def_instr_end() {
+    return def_instr_iterator(nullptr);
+  }
+
+  inline iterator_range<def_instr_iterator>
+  def_instructions(unsigned Reg) const {
+    return iterator_range<def_instr_iterator>(def_instr_begin(Reg),
+                                              def_instr_end());
+  }
+
+  /// def_bundle_iterator/def_bundle_begin/def_bundle_end - Walk all defs of the
+  /// specified register, stepping by bundle.
+  typedef defusechain_instr_iterator<false,true,false,false,false,true>
+          def_bundle_iterator;
+  def_bundle_iterator def_bundle_begin(unsigned RegNo) const {
+    return def_bundle_iterator(getRegUseDefListHead(RegNo));
+  }
+  static def_bundle_iterator def_bundle_end() {
+    return def_bundle_iterator(nullptr);
+  }
+
+  inline iterator_range<def_bundle_iterator> def_bundles(unsigned Reg) const {
+    return iterator_range<def_bundle_iterator>(def_bundle_begin(Reg),
+                                               def_bundle_end());
+  }
 
   /// def_empty - Return true if there are no instructions defining the
   /// specified register (it may be live-in).
@@ -253,11 +384,49 @@ public:
   }
 
   /// use_iterator/use_begin/use_end - Walk all uses of the specified register.
-  typedef defusechain_iterator<true,false,false> use_iterator;
+  typedef defusechain_iterator<true,false,false,true,false,false>
+          use_iterator;
   use_iterator use_begin(unsigned RegNo) const {
     return use_iterator(getRegUseDefListHead(RegNo));
   }
-  static use_iterator use_end() { return use_iterator(0); }
+  static use_iterator use_end() { return use_iterator(nullptr); }
+
+  inline iterator_range<use_iterator> use_operands(unsigned Reg) const {
+    return iterator_range<use_iterator>(use_begin(Reg), use_end());
+  }
+
+  /// use_instr_iterator/use_instr_begin/use_instr_end - Walk all uses of the
+  /// specified register, stepping by MachineInstr.
+  typedef defusechain_instr_iterator<true,false,false,false,true,false>
+          use_instr_iterator;
+  use_instr_iterator use_instr_begin(unsigned RegNo) const {
+    return use_instr_iterator(getRegUseDefListHead(RegNo));
+  }
+  static use_instr_iterator use_instr_end() {
+    return use_instr_iterator(nullptr);
+  }
+
+  inline iterator_range<use_instr_iterator>
+  use_instructions(unsigned Reg) const {
+    return iterator_range<use_instr_iterator>(use_instr_begin(Reg),
+                                              use_instr_end());
+  }
+
+  /// use_bundle_iterator/use_bundle_begin/use_bundle_end - Walk all uses of the
+  /// specified register, stepping by bundle.
+  typedef defusechain_instr_iterator<true,false,false,false,false,true>
+          use_bundle_iterator;
+  use_bundle_iterator use_bundle_begin(unsigned RegNo) const {
+    return use_bundle_iterator(getRegUseDefListHead(RegNo));
+  }
+  static use_bundle_iterator use_bundle_end() {
+    return use_bundle_iterator(nullptr);
+  }
+
+  inline iterator_range<use_bundle_iterator> use_bundles(unsigned Reg) const {
+    return iterator_range<use_bundle_iterator>(use_bundle_begin(Reg),
+                                               use_bundle_end());
+  }
 
   /// use_empty - Return true if there are no instructions using the specified
   /// register.
@@ -274,11 +443,56 @@ public:
 
   /// use_nodbg_iterator/use_nodbg_begin/use_nodbg_end - Walk all uses of the
   /// specified register, skipping those marked as Debug.
-  typedef defusechain_iterator<true,false,true> use_nodbg_iterator;
+  typedef defusechain_iterator<true,false,true,true,false,false>
+          use_nodbg_iterator;
   use_nodbg_iterator use_nodbg_begin(unsigned RegNo) const {
     return use_nodbg_iterator(getRegUseDefListHead(RegNo));
   }
-  static use_nodbg_iterator use_nodbg_end() { return use_nodbg_iterator(0); }
+  static use_nodbg_iterator use_nodbg_end() {
+    return use_nodbg_iterator(nullptr);
+  }
+
+  inline iterator_range<use_nodbg_iterator>
+  use_nodbg_operands(unsigned Reg) const {
+    return iterator_range<use_nodbg_iterator>(use_nodbg_begin(Reg),
+                                              use_nodbg_end());
+  }
+
+  /// use_instr_nodbg_iterator/use_instr_nodbg_begin/use_instr_nodbg_end - Walk
+  /// all uses of the specified register, stepping by MachineInstr, skipping
+  /// those marked as Debug.
+  typedef defusechain_instr_iterator<true,false,true,false,true,false>
+          use_instr_nodbg_iterator;
+  use_instr_nodbg_iterator use_instr_nodbg_begin(unsigned RegNo) const {
+    return use_instr_nodbg_iterator(getRegUseDefListHead(RegNo));
+  }
+  static use_instr_nodbg_iterator use_instr_nodbg_end() {
+    return use_instr_nodbg_iterator(nullptr);
+  }
+
+  inline iterator_range<use_instr_nodbg_iterator>
+  use_nodbg_instructions(unsigned Reg) const {
+    return iterator_range<use_instr_nodbg_iterator>(use_instr_nodbg_begin(Reg),
+                                                    use_instr_nodbg_end());
+  }
+
+  /// use_bundle_nodbg_iterator/use_bundle_nodbg_begin/use_bundle_nodbg_end - Walk
+  /// all uses of the specified register, stepping by bundle, skipping
+  /// those marked as Debug.
+  typedef defusechain_instr_iterator<true,false,true,false,false,true>
+          use_bundle_nodbg_iterator;
+  use_bundle_nodbg_iterator use_bundle_nodbg_begin(unsigned RegNo) const {
+    return use_bundle_nodbg_iterator(getRegUseDefListHead(RegNo));
+  }
+  static use_bundle_nodbg_iterator use_bundle_nodbg_end() {
+    return use_bundle_nodbg_iterator(nullptr);
+  }
+
+  inline iterator_range<use_bundle_nodbg_iterator>
+  use_nodbg_bundles(unsigned Reg) const {
+    return iterator_range<use_bundle_nodbg_iterator>(use_bundle_nodbg_begin(Reg),
+                                                     use_bundle_nodbg_end());
+  }
 
   /// use_nodbg_empty - Return true if there are no non-Debug instructions
   /// using the specified register.
@@ -401,6 +615,10 @@ public:
     return Hint.first ? 0 : Hint.second;
   }
 
+  /// markUsesInDebugValueAsUndef - Mark every DBG_VALUE referencing the
+  /// specified register as undefined which causes the DBG_VALUE to be
+  /// deleted during LiveDebugVariables analysis.
+  void markUsesInDebugValueAsUndef(unsigned Reg) const;
 
   //===--------------------------------------------------------------------===//
   // Physical Register Use Info
@@ -552,7 +770,8 @@ public:
   /// returns defs.  If neither are true then you are silly and it always
   /// returns end().  If SkipDebug is true it skips uses marked Debug
   /// when incrementing.
-  template<bool ReturnUses, bool ReturnDefs, bool SkipDebug>
+  template<bool ReturnUses, bool ReturnDefs, bool SkipDebug,
+           bool ByOperand, bool ByInstr, bool ByBundle>
   class defusechain_iterator
     : public std::iterator<std::forward_iterator_tag, MachineInstr, ptrdiff_t> {
     MachineOperand *Op;
@@ -563,10 +782,30 @@ public:
         if ((!ReturnUses && op->isUse()) ||
             (!ReturnDefs && op->isDef()) ||
             (SkipDebug && op->isDebug()))
-          ++*this;
+          advance();
       }
     }
     friend class MachineRegisterInfo;
+
+    void advance() {
+      assert(Op && "Cannot increment end iterator!");
+      Op = getNextOperandForReg(Op);
+
+      // All defs come before the uses, so stop def_iterator early.
+      if (!ReturnUses) {
+        if (Op) {
+          if (Op->isUse())
+            Op = nullptr;
+          else
+            assert(!Op->isDebug() && "Can't have debug defs");
+        }
+      } else {
+        // If this is an operand we don't care about, skip it.
+        while (Op && ((!ReturnDefs && Op->isDef()) ||
+                      (SkipDebug && Op->isDebug())))
+          Op = getNextOperandForReg(Op);
+      }
+    }
   public:
     typedef std::iterator<std::forward_iterator_tag,
                           MachineInstr, ptrdiff_t>::reference reference;
@@ -574,7 +813,7 @@ public:
                           MachineInstr, ptrdiff_t>::pointer pointer;
 
     defusechain_iterator(const defusechain_iterator &I) : Op(I.Op) {}
-    defusechain_iterator() : Op(0) {}
+    defusechain_iterator() : Op(nullptr) {}
 
     bool operator==(const defusechain_iterator &x) const {
       return Op == x.Op;
@@ -584,18 +823,82 @@ public:
     }
 
     /// atEnd - return true if this iterator is equal to reg_end() on the value.
-    bool atEnd() const { return Op == 0; }
+    bool atEnd() const { return Op == nullptr; }
 
     // Iterator traversal: forward iteration only
     defusechain_iterator &operator++() {          // Preincrement
       assert(Op && "Cannot increment end iterator!");
+      if (ByOperand)
+        advance();
+      else if (ByInstr) {
+        MachineInstr *P = Op->getParent();
+        do {
+          advance();
+        } while (Op && Op->getParent() == P);
+      } else if (ByBundle) {
+        MachineInstr *P = getBundleStart(Op->getParent());
+        do {
+          advance();
+        } while (Op && getBundleStart(Op->getParent()) == P);
+      }
+
+      return *this;
+    }
+    defusechain_iterator operator++(int) {        // Postincrement
+      defusechain_iterator tmp = *this; ++*this; return tmp;
+    }
+
+    /// getOperandNo - Return the operand # of this MachineOperand in its
+    /// MachineInstr.
+    unsigned getOperandNo() const {
+      assert(Op && "Cannot dereference end iterator!");
+      return Op - &Op->getParent()->getOperand(0);
+    }
+
+    // Retrieve a reference to the current operand.
+    MachineOperand &operator*() const {
+      assert(Op && "Cannot dereference end iterator!");
+      return *Op;
+    }
+
+    MachineOperand *operator->() const {
+      assert(Op && "Cannot dereference end iterator!");
+      return Op;
+    }
+  };
+
+  /// defusechain_iterator - This class provides iterator support for machine
+  /// operands in the function that use or define a specific register.  If
+  /// ReturnUses is true it returns uses of registers, if ReturnDefs is true it
+  /// returns defs.  If neither are true then you are silly and it always
+  /// returns end().  If SkipDebug is true it skips uses marked Debug
+  /// when incrementing.
+  template<bool ReturnUses, bool ReturnDefs, bool SkipDebug,
+           bool ByOperand, bool ByInstr, bool ByBundle>
+  class defusechain_instr_iterator
+    : public std::iterator<std::forward_iterator_tag, MachineInstr, ptrdiff_t> {
+    MachineOperand *Op;
+    explicit defusechain_instr_iterator(MachineOperand *op) : Op(op) {
+      // If the first node isn't one we're interested in, advance to one that
+      // we are interested in.
+      if (op) {
+        if ((!ReturnUses && op->isUse()) ||
+            (!ReturnDefs && op->isDef()) ||
+            (SkipDebug && op->isDebug()))
+          advance();
+      }
+    }
+    friend class MachineRegisterInfo;
+
+    void advance() {
+      assert(Op && "Cannot increment end iterator!");
       Op = getNextOperandForReg(Op);
 
       // All defs come before the uses, so stop def_iterator early.
       if (!ReturnUses) {
         if (Op) {
           if (Op->isUse())
-            Op = 0;
+            Op = nullptr;
           else
             assert(!Op->isDebug() && "Can't have debug defs");
         }
@@ -605,52 +908,59 @@ public:
                       (SkipDebug && Op->isDebug())))
           Op = getNextOperandForReg(Op);
       }
+    }
+  public:
+    typedef std::iterator<std::forward_iterator_tag,
+                          MachineInstr, ptrdiff_t>::reference reference;
+    typedef std::iterator<std::forward_iterator_tag,
+                          MachineInstr, ptrdiff_t>::pointer pointer;
 
-      return *this;
+    defusechain_instr_iterator(const defusechain_instr_iterator &I) : Op(I.Op){}
+    defusechain_instr_iterator() : Op(nullptr) {}
+
+    bool operator==(const defusechain_instr_iterator &x) const {
+      return Op == x.Op;
     }
-    defusechain_iterator operator++(int) {        // Postincrement
-      defusechain_iterator tmp = *this; ++*this; return tmp;
+    bool operator!=(const defusechain_instr_iterator &x) const {
+      return !operator==(x);
     }
 
-    /// skipInstruction - move forward until reaching a different instruction.
-    /// Return the skipped instruction that is no longer pointed to, or NULL if
-    /// already pointing to end().
-    MachineInstr *skipInstruction() {
-      if (!Op) return 0;
-      MachineInstr *MI = Op->getParent();
-      do ++*this;
-      while (Op && Op->getParent() == MI);
-      return MI;
-    }
+    /// atEnd - return true if this iterator is equal to reg_end() on the value.
+    bool atEnd() const { return Op == nullptr; }
 
-    MachineInstr *skipBundle() {
-      if (!Op) return 0;
-      MachineInstr *MI = getBundleStart(Op->getParent());
-      do ++*this;
-      while (Op && getBundleStart(Op->getParent()) == MI);
-      return MI;
-    }
+    // Iterator traversal: forward iteration only
+    defusechain_instr_iterator &operator++() {          // Preincrement
+      assert(Op && "Cannot increment end iterator!");
+      if (ByOperand)
+        advance();
+      else if (ByInstr) {
+        MachineInstr *P = Op->getParent();
+        do {
+          advance();
+        } while (Op && Op->getParent() == P);
+      } else if (ByBundle) {
+        MachineInstr *P = getBundleStart(Op->getParent());
+        do {
+          advance();
+        } while (Op && getBundleStart(Op->getParent()) == P);
+      }
 
-    MachineOperand &getOperand() const {
-      assert(Op && "Cannot dereference end iterator!");
-      return *Op;
+      return *this;
     }
-
-    /// getOperandNo - Return the operand # of this MachineOperand in its
-    /// MachineInstr.
-    unsigned getOperandNo() const {
-      assert(Op && "Cannot dereference end iterator!");
-      return Op - &Op->getParent()->getOperand(0);
+    defusechain_instr_iterator operator++(int) {        // Postincrement
+      defusechain_instr_iterator tmp = *this; ++*this; return tmp;
     }
 
     // Retrieve a reference to the current operand.
     MachineInstr &operator*() const {
       assert(Op && "Cannot dereference end iterator!");
+      if (ByBundle) return *(getBundleStart(Op->getParent()));
       return *Op->getParent();
     }
 
     MachineInstr *operator->() const {
       assert(Op && "Cannot dereference end iterator!");
+      if (ByBundle) return getBundleStart(Op->getParent());
       return Op->getParent();
     }
   };
@@ -663,7 +973,7 @@ class PSetIterator {
   const int *PSet;
   unsigned Weight;
 public:
-  PSetIterator(): PSet(0), Weight(0) {}
+  PSetIterator(): PSet(nullptr), Weight(0) {}
   PSetIterator(unsigned RegUnit, const MachineRegisterInfo *MRI) {
     const TargetRegisterInfo *TRI = MRI->getTargetRegisterInfo();
     if (TargetRegisterInfo::isVirtualRegister(RegUnit)) {
@@ -676,7 +986,7 @@ public:
       Weight = TRI->getRegUnitWeight(RegUnit);
     }
     if (*PSet == -1)
-      PSet = 0;
+      PSet = nullptr;
   }
   bool isValid() const { return PSet; }
 
@@ -688,7 +998,7 @@ public:
     assert(isValid() && "Invalid PSetIterator.");
     ++PSet;
     if (*PSet == -1)
-      PSet = 0;
+      PSet = nullptr;
   }
 };