Add ir_loop_jump to represent 'break' and 'continue' in loops

ir.h

@@ -532,6 +532,51 @@ public:
 private:
    ir_rvalue *value;
 };
+
+
+/**
+ * Jump instructions used inside loops
+ *
+ * These include \c break and \c continue.  The \c break within a loop is
+ * different from the \c break within a switch-statement.
+ *
+ * \sa ir_switch_jump
+ */
+class ir_loop_jump : public ir_jump {
+public:
+   enum jump_mode {
+      jump_break,
+      jump_continue
+   };
+
+   ir_loop_jump(ir_loop *loop, jump_mode mode)
+      : loop(loop), mode(mode)
+   {
+      /* empty */
+   }
+
+   virtual void accept(ir_visitor *v)
+   {
+      v->visit(this);
+   }
+
+   bool is_break() const
+   {
+      return mode == jump_break;
+   }
+
+   bool is_continue() const
+   {
+      return mode == jump_continue;
+   }
+
+private:
+   /** Loop containing this break instruction. */
+   ir_loop *loop;
+
+   /** Mode selector for the jump instruction. */
+   enum jump_mode mode;
+};
 /*@}*/
 
 

ir_constant_expression.cpp

@@ -75,6 +75,7 @@ public:
    virtual void visit(ir_return *);
    virtual void visit(ir_if *);
    virtual void visit(ir_loop *);
+   virtual void visit(ir_loop_jump *);
    /*@}*/
 
    /**
@@ -473,3 +474,11 @@ ir_constant_visitor::visit(ir_loop *ir)
    (void) ir;
    value = NULL;
 }
+
+
+void
+ir_constant_visitor::visit(ir_loop_jump *ir)
+{
+   (void) ir;
+   value = NULL;
+}

ir_constant_folding.cpp

@@ -152,3 +152,10 @@ ir_constant_folding_visitor::visit(ir_loop *ir)
 {
    (void) ir;
 }
+
+
+void
+ir_constant_folding_visitor::visit(ir_loop_jump *ir)
+{
+   (void) ir;
+}

ir_constant_folding.h

@@ -59,5 +59,6 @@ public:
    virtual void visit(ir_return *);
    virtual void visit(ir_if *);
    virtual void visit(ir_loop *);
+   virtual void visit(ir_loop_jump *);
    /*@}*/
 };

ir_print_visitor.cpp

@@ -319,3 +319,10 @@ ir_print_visitor::visit(ir_loop *ir)
    }
    printf("))\n");
 }
+
+
+void
+ir_print_visitor::visit(ir_loop_jump *ir)
+{
+   printf("%s", ir->is_break() ? "break" : "continue");
+}

ir_print_visitor.h

@@ -66,6 +66,7 @@ public:
    virtual void visit(ir_return *);
    virtual void visit(ir_if *);
    virtual void visit(ir_loop *);
+   virtual void visit(ir_loop_jump *);
    /*@}*/
 
 private:

ir_visitor.h

@@ -57,6 +57,7 @@ public:
    virtual void visit(class ir_return *) = 0;
    virtual void visit(class ir_if *) = 0;
    virtual void visit(class ir_loop *) = 0;
+   virtual void visit(class ir_loop_jump *) = 0;
    /*@}*/
 };