Subzero: Provide a macro for iterating over instruction variables.

src/IceCfg.cpp

 //===- subzero/src/IceCfg.cpp - Control flow graph implementation ---------===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
 /// This file implements the Cfg class, including constant pool
 /// management.
 ///
 //===----------------------------------------------------------------------===//
 
 #include "IceCfg.h"
 
 #include "IceAssembler.h"
 #include "IceCfgNode.h"
 #include "IceClFlags.h"
 #include "IceDefs.h"
 #include "IceELFObjectWriter.h"
 #include "IceGlobalInits.h"
 #include "IceInst.h"
+#include "IceInstVarIter.h"
 #include "IceLiveness.h"
 #include "IceOperand.h"
 #include "IceTargetLowering.h"
 
 namespace Ice {
 
 ICE_TLS_DEFINE_FIELD(const Cfg *, Cfg, CurrentCfg);
 
 ArenaAllocator<> *getCurrentCfgAllocator() {
   return Cfg::getCurrentCfgAllocator();
@@ skipping 543 matching lines @@
               Dest->getLiveRange().containsValue(InstNumber - 1, IsDest))
             Invalid = true;
           if (Invalid) {
             Valid = false;
             Str << "Liveness error: inst " << Inst.getNumber() << " dest ";
             Dest->dump(this);
             Str << " live range " << Dest->getLiveRange() << "\n";
           }
         }
       }
-      for (SizeT I = 0; I < Inst.getSrcSize(); ++I) {
-        Operand *Src = Inst.getSrc(I);
-        SizeT NumVars = Src->getNumVars();
-        for (SizeT J = 0; J < NumVars; ++J) {
-          const Variable *Var = Src->getVar(J);
-          const bool IsDest = false;
-          if (!Var->getIgnoreLiveness() &&
-              !Var->getLiveRange().containsValue(InstNumber, IsDest)) {
-            Valid = false;
-            Str << "Liveness error: inst " << Inst.getNumber() << " var ";
-            Var->dump(this);
-            Str << " live range " << Var->getLiveRange() << "\n";
-          }
+      FOREACH_VAR_IN_INST(Var, Inst) {
+        static constexpr bool IsDest = false;
+        if (!Var->getIgnoreLiveness() &&
+            !Var->getLiveRange().containsValue(InstNumber, IsDest)) {
+          Valid = false;
+          Str << "Liveness error: inst " << Inst.getNumber() << " var ";
+          Var->dump(this);
+          Str << " live range " << Var->getLiveRange() << "\n";
         }
       }
     }
   }
   return Valid;
 }
 
 void Cfg::contractEmptyNodes() {
   // If we're decorating the asm output with register liveness info,
   // this information may become corrupted or incorrect after
@@ skipping 160 matching lines @@
     }
   }
   // Print each basic block
   for (CfgNode *Node : Nodes)
     Node->dump(this);
   if (isVerbose(IceV_Instructions))
     Str << "}\n";
 }
 
 } // end of namespace Ice