+typedef struct ir_op ir_op;
+
+extern ir_op *op_Block; ir_op *get_op_Block (void);
+
+extern ir_op *op_Start; ir_op *get_op_Start (void);
+extern ir_op *op_End; ir_op *get_op_End (void);
+extern ir_op *op_Jmp; ir_op *get_op_Jmp (void);
+extern ir_op *op_IJmp; ir_op *get_op_IJmp (void);
+extern ir_op *op_Cond; ir_op *get_op_Cond (void);
+extern ir_op *op_Return; ir_op *get_op_Return (void);
+extern ir_op *op_Raise; ir_op *get_op_Raise (void);
+extern ir_op *op_Sel; ir_op *get_op_Sel (void);
+extern ir_op *op_InstOf; ir_op *get_op_InstOf (void);
+
+extern ir_op *op_Const; ir_op *get_op_Const (void);
+extern ir_op *op_SymConst; ir_op *get_op_SymConst (void);
+
+extern ir_op *op_Call; ir_op *get_op_Call (void);
+extern ir_op *op_Add; ir_op *get_op_Add (void);
+extern ir_op *op_Sub; ir_op *get_op_Sub (void);
+extern ir_op *op_Minus; ir_op *get_op_Minus (void);
+extern ir_op *op_Mul; ir_op *get_op_Mul (void);
+extern ir_op *op_Quot; ir_op *get_op_Quot (void);
+extern ir_op *op_DivMod; ir_op *get_op_DivMod (void);
+extern ir_op *op_Div; ir_op *get_op_Div (void);
+extern ir_op *op_Mod; ir_op *get_op_Mod (void);
+extern ir_op *op_Abs; ir_op *get_op_Abs (void);
+extern ir_op *op_And; ir_op *get_op_And (void);
+extern ir_op *op_Or; ir_op *get_op_Or (void);
+extern ir_op *op_Eor; ir_op *get_op_Eor (void);
+extern ir_op *op_Not; ir_op *get_op_Not (void);
+extern ir_op *op_Cmp; ir_op *get_op_Cmp (void);
+extern ir_op *op_Shl; ir_op *get_op_Shl (void);
+extern ir_op *op_Shr; ir_op *get_op_Shr (void);
+extern ir_op *op_Shrs; ir_op *get_op_Shrs (void);
+extern ir_op *op_Rot; ir_op *get_op_Rot (void);
+extern ir_op *op_Conv; ir_op *get_op_Conv (void);
+extern ir_op *op_Cast; ir_op *get_op_Cast (void);
+
+extern ir_op *op_Phi; ir_op *get_op_Phi (void);
+
+extern ir_op *op_Load; ir_op *get_op_Load (void);
+extern ir_op *op_Store; ir_op *get_op_Store (void);
+extern ir_op *op_Alloc; ir_op *get_op_Alloc (void);
+extern ir_op *op_Free; ir_op *get_op_Free (void);
+
+extern ir_op *op_Sync; ir_op *get_op_Sync (void);
+
+extern ir_op *op_Tuple; ir_op *get_op_Tuple (void);
+extern ir_op *op_Proj; ir_op *get_op_Proj (void);
+extern ir_op *op_Id; ir_op *get_op_Id (void);
+extern ir_op *op_Bad; ir_op *get_op_Bad (void);
+extern ir_op *op_Confirm; ir_op *get_op_Confirm (void);
+
+extern ir_op *op_Unknown; ir_op *get_op_Unknown (void);
+extern ir_op *op_Filter; ir_op *get_op_Filter (void);
+extern ir_op *op_Break; ir_op *get_op_Break (void);
+extern ir_op *op_CallBegin; ir_op *get_op_CallBegin (void);
+extern ir_op *op_EndReg; ir_op *get_op_EndReg (void);
+extern ir_op *op_EndExcept; ir_op *get_op_EndExcept (void);
+
+extern ir_op *op_NoMem; ir_op *get_op_NoMem (void);
+extern ir_op *op_Mux; ir_op *get_op_Mux (void);
+extern ir_op *op_CopyB; ir_op *get_op_CopyB (void);
+
+/** Returns the ident for the opcode name */
+ident *get_op_ident(const ir_op *op);
+
+/** Returns the string for the opcode. */
+const char *get_op_name(const ir_op *op);
+
+/** Returns the enum for the opcode */
+opcode get_op_code(const ir_op *op);
+
+/** op_pin_state_pinned states */
+typedef enum {
+ op_pin_state_floats = 0, /**< Nodes of this opcode can be placed in any basic block. */
+ op_pin_state_pinned, /**< Nodes must remain in this basic block. */
+ op_pin_state_exc_pinned, /**< Node must be remain in this basic block if it can throw an
+ exception, else can float. Used internally. */
+ op_pin_state_mem_pinned /**< Node must be remain in this basic block if it can throw an
+ exception or uses memory, else can float. Used internally. */
+} op_pin_state;
+
+const char *get_op_pin_state_name(op_pin_state s);
+
+/** gets pinned state of an opcode */
+op_pin_state get_op_pinned(const ir_op *op);
+
+/** Sets pinned in the opcode. Setting it to floating has no effect
+ for Block, Phi and control flow nodes. */
+void set_op_pinned(ir_op *op, op_pin_state pinned);
+
+/** Returns the next free IR opcode number, allows to register user ops */
+unsigned get_next_ir_opcode(void);
+
+/**
+ * Creates a new ir operation.
+ *
+ * @param code the opcode, one of type \c opcode
+ * @param name the printable name of this opcode
+ * @param p whether operations of this opcode are op_pin_state_pinned or floating
+ * @param flags a bitmask of irop_flags describing the behavior of the ir operation
+ * @param opar the parity of this ir operation
+ * @param op_index if the parity is oparity_unary, oparity_binary or oparity_trinary the index
+ * of the left operand
+ * @param attr_size attribute size for this ir operation
+ *
+ * @return The generated ir operation.
+ */
+ir_op * new_ir_op(opcode code, const char *name, op_pin_state p,
+ unsigned flags, op_arity opar, int op_index, size_t attr_size);
+
+/**
+ * A generic function pointer.
+ */
+typedef void (*op_func)(void);
+
+/** The NULL-function. */
+#define NULL_FUNC ((generic_func)(NULL))
+
+/**
+ * Returns the generic function pointer from an ir operation.
+ */
+op_func get_generic_function_ptr(const ir_op *op);
+
+/**
+ * Store a generic function pointer into an ir operation.
+ */
+void set_generic_function_ptr(ir_op *op, op_func func);