Subzero: Update tests and build scripts for sandboxing.

src/IceTargetLowering.h

 //===- subzero/src/IceTargetLowering.h - Lowering interface -----*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file declares the TargetLowering, LoweringContext, and
@@ skipping 174 matching lines @@
 
   virtual llvm::SmallBitVector getRegisterSet(RegSetMask Include,
                                               RegSetMask Exclude) const = 0;
   virtual const llvm::SmallBitVector &getRegisterSetForType(Type Ty) const = 0;
   void regAlloc(RegAllocKind Kind);
 
   virtual void makeRandomRegisterPermutation(
       llvm::SmallVectorImpl<int32_t> &Permutation,
       const llvm::SmallBitVector &ExcludeRegisters) const = 0;
 
+  // Save/restore any mutable state for the situation where code
+  // emission needs multiple passes, such as sandboxing or relaxation.
+  // Subclasses may provide their own implementation, but should be
+  // sure to also call the parent class's methods.
+  virtual void snapshotEmitState() {
+    SnapshotStackAdjustment = StackAdjustment;
+  }
+  virtual void rollbackEmitState() {
+    StackAdjustment = SnapshotStackAdjustment;
+  }
+
   virtual void emitVariable(const Variable *Var) const = 0;
 
   // Performs target-specific argument lowering.
   virtual void lowerArguments() = 0;
 
   virtual void addProlog(CfgNode *Node) = 0;
   virtual void addEpilog(CfgNode *Node) = 0;
 
   virtual ~TargetLowering() {}
 
@@ skipping 27 matching lines @@
 
   Cfg *Func;
   GlobalContext *Ctx;
   const bool RandomizeRegisterAllocation;
   bool HasComputedFrame;
   bool CallsReturnsTwice;
   // StackAdjustment keeps track of the current stack offset from its
   // natural location, as arguments are pushed for a function call.
   int32_t StackAdjustment;
   LoweringContext Context;
+
+private:
+  int32_t SnapshotStackAdjustment;
 };
 
 // TargetDataLowering is used for "lowering" data including initializers
 // for global variables, and the internal constant pools.  It is separated
 // out from TargetLowering because it does not require a Cfg.
 class TargetDataLowering {
   TargetDataLowering() = delete;
   TargetDataLowering(const TargetDataLowering &) = delete;
   TargetDataLowering &operator=(const TargetDataLowering &) = delete;
 
 public:
   static std::unique_ptr<TargetDataLowering> createLowering(GlobalContext *Ctx);
   virtual ~TargetDataLowering();
 
   virtual void
   lowerGlobals(std::unique_ptr<VariableDeclarationList> Vars) const = 0;
   virtual void lowerConstants() const = 0;
 
 protected:
   TargetDataLowering(GlobalContext *Ctx) : Ctx(Ctx) {}
   GlobalContext *Ctx;
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICETARGETLOWERING_H