Subzero: Add sandboxing for x86-32.

src/IceInstX8632.h

 //===- subzero/src/IceInstX8632.h - Low-level x86 instructions --*- 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 InstX8632 and OperandX8632 classes and
@@ skipping 178 matching lines @@
     Cvt,
     Div,
     Divps,
     Divss,
     Fld,
     Fstp,
     Icmp,
     Idiv,
     Imul,
     Insertps,
+    Jmp,
     Label,
     Lea,
     Load,
     Mfence,
     Mov,
     Movd,
     Movp,
     Movq,
     MovssRegs,
     Movsx,
@@ skipping 184 matching lines @@
 private:
   InstX8632Br(Cfg *Func, const CfgNode *TargetTrue, const CfgNode *TargetFalse,
               const InstX8632Label *Label, CondX86::BrCond Condition);
   ~InstX8632Br() override {}
   CondX86::BrCond Condition;
   const CfgNode *TargetTrue;
   const CfgNode *TargetFalse;
   const InstX8632Label *Label; // Intra-block branch target
 };
 
+// Jump to a target outside this function, such as tailcall, nacljump,
+// naclret, unreachable.  This is different from a Branch instruction
+// in that there is no intra-function control flow to represent.
+class InstX8632Jmp : public InstX8632 {
+  InstX8632Jmp(const InstX8632Jmp &) = delete;
+  InstX8632Jmp &operator=(const InstX8632Jmp &) = delete;
+
+public:
+  static InstX8632Jmp *create(Cfg *Func, Operand *Target) {
+    return new (Func->allocate<InstX8632Jmp>()) InstX8632Jmp(Func, Target);
+  }
+  Operand *getJmpTarget() const { return getSrc(0); }
+  void emit(const Cfg *Func) const override;
+  void emitIAS(const Cfg *Func) const override;
+  void dump(const Cfg *Func) const override;
+  static bool classof(const Inst *Inst) { return isClassof(Inst, Jmp); }
+
+private:
+  InstX8632Jmp(Cfg *Func, Operand *Target);
+};
+
 // AdjustStack instruction - subtracts esp by the given amount and
 // updates the stack offset during code emission.
 class InstX8632AdjustStack : public InstX8632 {
   InstX8632AdjustStack(const InstX8632AdjustStack &) = delete;
   InstX8632AdjustStack &operator=(const InstX8632AdjustStack &) = delete;
 
 public:
   static InstX8632AdjustStack *create(Cfg *Func, SizeT Amount, Variable *Esp) {
     return new (Func->allocate<InstX8632AdjustStack>())
         InstX8632AdjustStack(Func, Amount, Esp);
@@ skipping 1169 matching lines @@
 template <> void InstX8632Pinsr::emitIAS(const Cfg *Func) const;
 template <> void InstX8632Movsx::emitIAS(const Cfg *Func) const;
 template <> void InstX8632Movzx::emitIAS(const Cfg *Func) const;
 template <> void InstX8632Pmull::emitIAS(const Cfg *Func) const;
 template <> void InstX8632Pshufd::emitIAS(const Cfg *Func) const;
 template <> void InstX8632Shufps::emitIAS(const Cfg *Func) const;
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICEINSTX8632_H