Iasm and obj lowering for advanced switch lowering.

src/IceCfg.h

Index: src/IceCfg.h
diff --git a/src/IceCfg.h b/src/IceCfg.h
index 08b4e979c2c07d993a56b38a2f3163627b45c1e1..86cb3b45dafafb99fd22b988c6a0cb4f5689f782 100644
--- a/src/IceCfg.h
+++ b/src/IceCfg.h
@@ -24,6 +24,8 @@
 
 namespace Ice {
 
+class InstJumpTable;
+
 class Cfg {
   Cfg() = delete;
   Cfg(const Cfg &) = delete;
@@ -140,6 +142,13 @@ public:
   const VarList &getImplicitArgs() const { return ImplicitArgs; }
   /// @}
 
+  /// \name Manage the jump tables.
+  /// @{
+  void addJumpTable(InstJumpTable *JumpTable) {
+    JumpTables.emplace_back(JumpTable);
+  }
+  /// @}
+
   /// \name Miscellaneous accessors.
   /// @{
   TargetLowering *getTarget() const { return Target.get(); }
@@ -183,6 +192,7 @@ public:
   bool validateLiveness() const;
   void contractEmptyNodes();
   void doBranchOpt();
+  void markNodesForSandboxing();
 
   /// \name  Manage the CurrentNode field.
   /// CurrentNode is used for validating the Variable::DefNode field during
@@ -229,6 +239,12 @@ private:
   /// code needs to be defined.
   void profileBlocks();
 
+  /// Delete registered jump table placeholder instructions. This should only be
+  /// called once all repointing has taken palce.
+  void deleteJumpTableInsts();
+  /// Iterate through the registered jump tables and emit them.
+  void emitJumpTables();
+
   GlobalContext *Ctx;
   uint32_t SequenceNumber; /// output order for emission
   VerboseMask VMask;
@@ -252,6 +268,7 @@ private:
   std::unique_ptr<Assembler> TargetAssembler;
   /// Globals required by this CFG. Mostly used for the profiler's globals.
   std::unique_ptr<VariableDeclarationList> GlobalInits;
+  std::vector<InstJumpTable *> JumpTables;
 
   /// CurrentNode is maintained during dumping/emitting just for
   /// validating Variable::DefNode.  Normally, a traversal over