irnode.h

/*
 * Project:     libFIRM
 * File name:   ir/ir/irnode.h
 * Purpose:     Representation of an intermediate operation.
 * Author:      Martin Trapp, Christian Schaefer
 * Modified by: Goetz Lindenmaier
 * Created:
 * CVS-ID:      $Id$
 * Copyright:   (c) 1998-2003 Universität Karlsruhe
 * Licence:     This file protected by GPL -  GNU GENERAL PUBLIC LICENSE.
 */
# ifndef _IRNODE_H_
# define _IRNODE_H_

#include <stddef.h>

# include "irgraph.h"
# include "entity.h"
# include "firm_common.h"
# include "irop.h"
# include "irmode.h"
# include "type.h"
# include "irextbb.h"
# include "dbginfo.h"

/**
 * @file irnode.h
 *
 * @author Martin Trapp, Christian Schaefer
 *
 * Declarations of an ir node.
 */

/**
 * @defgroup ir_node Declarations of an ir node.
 *
 * The type definition of ir_node is also in irgraph.h to resolve
 *  recursion between irnode.h and irgraph.h
 *
 * ir_node - a datatype representing a Firm node
 *
 *  The common fields are:
 *
 *  - firm_kind - A firm_kind tag containing k_type.  This is useful
 *                for dynamically checking whether a node is a ir_node.
 *  - arity     - The number of predecessors in the Firm graph.
 *  - in        - A list with the predecessors in the Firm graph.  There are
 *                routines to access individual elements and to obtain the
 *                array.  The method returning the array should not be used.
 *  - mode      - The mode of the node.  There are routines to get the mode
 *                but also to access the mode's fields directly.
 *  - opcode    - The opcode of the node. There are routines to get the opcode
 *                but also to access the opcode's fields directly.
 *  - node_nr   - A unique number for the node.  Available only if debugging
 *                is turned on.
 * @{
 */

#ifndef _IR_NODE_TYPEDEF_
#define _IR_NODE_TYPEDEF_
typedef struct ir_node ir_node;
#endif

#ifdef __cplusplus
extern "C" {
#endif

/**
 *   you can work on the graph without considering the different types
 *   of nodes, it's just a big graph.
 */

/**
 *   Checks whether a pointer points to a ir node.
 *
 *   @param thing   an arbitrary pointer
 *   @return        non-zero if the thing is a ir mode, else zero
 */
int is_ir_node (const void *thing);

/**
 * Returns the number of predecessors without the block predecessor.
 *
 * @param node   the IR-node
 */
int           get_irn_arity         (const ir_node *node);
int           get_irn_intra_arity   (const ir_node *node);
int           get_irn_inter_arity   (const ir_node *node);

/** Replaces the old in array by a new one that will contain the ins given in
   the parameters.  Conserves the block predecessor.  It copies the array passed.
   This function is necessary to adjust in arrays of blocks, calls and phis.
   Assumes that current_ir_graph is set to the graph containing "node".
   "in" must contain all predecessors except the block that are required for
   the nodes opcode. */
void          set_irn_in            (ir_node *node, int arity, ir_node *in[]);

/* to iterate through the predecessors without touching the array. No
   order of predecessors guaranteed.
   To iterate over the operands iterate from 0 to i < get_irn_arity(),
   to iterate including the Block predecessor iterate from i = -1 to
   i < get_irn_arity. */
/* Access predecessor n */

/**
 * Get the n-th predecessor of a node.
 * This function removes Id predecessors.
 */
ir_node      *get_irn_n             (const ir_node *node, int n);
ir_node      *get_irn_intra_n       (const ir_node *node, int n);
ir_node      *get_irn_inter_n       (const ir_node *node, int n);

/** Replace the n-th predecessor of a node with a new one. */
void          set_irn_n             (ir_node *node, int n, ir_node *in);
/* Sets the mode struct of node.  */
void          set_irn_mode (ir_node *node, ir_mode *mode);
/** Gets the mode struct of a node.  */
ir_mode      *get_irn_mode          (const ir_node *node);
/** Gets the mode-enum modecode. */
modecode      get_irn_modecode      (const ir_node *node);
/** Gets the ident for a string representation of the mode .*/
ident        *get_irn_modeident     (const ir_node *node);
/** Gets the string representation of the mode .*/
const char   *get_irn_modename      (const ir_node *node);
/** Gets the opcode struct of the node. */
ir_op        *get_irn_op            (const ir_node *node);
/** Sets the opcode struct of the node. */
void          set_irn_op            (ir_node *node, ir_op *op);
/** Gets the opcode-enum of the node. */
opcode        get_irn_opcode        (const ir_node *node);
/** Get the string representation of the opcode. */
const char   *get_irn_opname        (const ir_node *node);
/** Get the ident for a string representation of the opcode. */
ident        *get_irn_opident       (const ir_node *node);
/** Gets the visited counter of a node. */
unsigned long get_irn_visited (const ir_node *node);
/** Sets the visited counter of a node. */
void          set_irn_visited (ir_node *node, unsigned long visited);
/** Sets visited to get_irg_visited(current_ir_graph). */
void          mark_irn_visited (ir_node *node);
/** Returns 1 if visited < get_irg_visited(current_ir_graph). */
int           irn_not_visited  (const ir_node *node);
/** Returns 1 if visited >= get_irg_visited(current_ir_graph). */
int           irn_visited      (const ir_node *node);

/**
 * Sets the link of a node.
 * Only allowed if the graph is NOT in phase_building.
 */
void          set_irn_link     (ir_node *node, void *link);

/** Returns the link of a node.  */
void         *get_irn_link     (const ir_node *node);

/** Returns the ir_graph this node belongs to. Only valid if irg
 *  is in state op_pin_state_pinned (irg is only stored in the block. */
ir_graph     *get_irn_irg      (const ir_node *node);

/** Outputs a unique number for this node if libFIRM is compiled for
   debugging, (configure with --enable-debug) else returns address
   of node cast to long. */
long          get_irn_node_nr  (const ir_node *node);

/** Returns the pinned state of a node. */
op_pin_state get_irn_pinned    (const ir_node *node);

/** Set pin state for nodes with op pin state op_pin_state_exc_pinned */
void set_irn_pinned(ir_node *node, op_pin_state state);

/**
 * irnode constructor.
 * Create a new irnode in irg, with an op, mode, arity and
 * some incoming irnodes.
 * This constructor is used in every specified irnode constructor.
 *
 * @param db    Debug info.
 * @param irg   IR-graph on with this new node should be constructed.
 * @param op    The opcode of the new node.
 * @param mode  The mode of the new node.
 * @param arity The arity of the new node, may be <0 if yet.
 * @param in    An array of arity predecessor nodes.
 */
ir_node *
new_ir_node (dbg_info *db,
         ir_graph *irg,
         ir_node *block,
         ir_op *op,
         ir_mode *mode,
         int arity,
         ir_node *in[]);

/** Return the block the node belongs to.
 *
 * This works for all except Block.  It can return Blocks or the Bad node.
 *
 * To express the difference to access routines that work for all
 * nodes we use infix "nodes" and do not name this function
 * get_irn_block. */
ir_node  *get_nodes_block (const ir_node *node);

/** Sets the Block of a node. */
void      set_nodes_block (ir_node *node, ir_node *block);

/**
 * @function get_irn_block()
 * @see get_nodes_block()
 */
/**
 * Projection numbers for result of Start node: use for Proj nodes!
 */
typedef enum {
  pn_Start_X_initial_exec,   /**< Projection on the initial control flow. */
  pn_Start_M,                /**< Projection on the initial memory. */
  pn_Start_P_frame_base,     /**< Projection on the frame base pointer. */
  pn_Start_P_globals,        /**< Projection on the pointer to the data segment
                                  containing _all_ global entities. */
  pn_Start_T_args,           /**< Projection on all arguments. */
  pn_Start_P_value_arg_base, /**< Pointer to region of compound value arguments as defined by
                                  type of this method. */
  pn_Start_max               /**< number of projections from a Start */
} pn_Start; /* Projection numbers for Start. */


/** Test whether arbitrary node is frame pointer.
 *
 * Test whether arbitrary node is frame pointer, i.e. Proj(pn_Start_P_frame_base)
 * from Start.  If so returns frame type, else Null. */
type *is_frame_pointer(ir_node *n);

/** Test whether arbitrary node is globals pointer.
 *
 * Test whether arbitrary node is globals pointer, i.e. Proj(pn_Start_P_globals)
 * from Start.  If so returns global type, else Null. */
type *is_globals_pointer(ir_node *n);

/** Test whether arbitrary node is value arg base.
 *
 * Test whether arbitrary node is value arg base, i.e. Proj(pn_Start_P_value_arg_base)
 * from Start.   If so returns 1, else 0. */
int   is_value_arg_pointer(ir_node *n);


/* @@@ no more supported  */
ir_node **get_Block_cfgpred_arr (ir_node *node);
int       get_Block_n_cfgpreds (ir_node *node);
ir_node  *get_Block_cfgpred (ir_node *node, int pos);
void      set_Block_cfgpred (ir_node *node, int pos, ir_node *pred);
bool      get_Block_matured (ir_node *node);
void      set_Block_matured (ir_node *node, bool matured);

/** A visited flag only for block nodes.
 *  @see also: get_irn_visited() inc_irg_visited() inc_irg_block_visited()*/
unsigned long get_Block_block_visited (ir_node *node);
void      set_Block_block_visited (ir_node *node, unsigned long visit);
ir_node  *set_Block_dead(ir_node *block);
int       is_Block_dead(const ir_node *block);

/* For this current_ir_graph must be set. */
void      mark_Block_block_visited(ir_node *node);
int       Block_not_block_visited(ir_node *node);

/* Set and remove interprocedural predecessors. If the interprocedural
 * predecessors are removed, the node has the same predecessors in
 * both views.
 * @@@ Maybe better:  arity is zero if no cg preds. */
void      set_Block_cg_cfgpred_arr(ir_node * node, int arity, ir_node ** in);
void      set_Block_cg_cfgpred(ir_node * node, int pos, ir_node * pred);
/* @@@ not supported */
ir_node **get_Block_cg_cfgpred_arr(ir_node * node);
/** Returns the number of interprocedural predecessors.  0 if none. */
int       get_Block_cg_n_cfgpreds(ir_node * node);
/** Return the interprocedural predecessor at position pos. */
ir_node  *get_Block_cg_cfgpred(ir_node * node, int pos);
/* frees the memory. */
void      remove_Block_cg_cfgpred_arr(ir_node * node);

/** returns the extended basic block a block belongs to */
ir_extblk *get_Block_extbb(const ir_node *block);
/** sets the extended basic block a block belongs to */
void set_Block_extbb(ir_node *block, ir_extblk *extblk);

/** Return the number of Keep alive node. */
int  get_End_n_keepalives(ir_node *end);

/** Return the Keep alive node a position pos. */
ir_node *get_End_keepalive(ir_node *end, int pos);

/** Keep alive dedicated nodes.  These must be either PhiM or Block nodes. */
void add_End_keepalive (ir_node *end, ir_node *ka);

/** Set the Keep alive node at position pos. */
void set_End_keepalive(ir_node *end, int pos, ir_node *ka);

/** Some parts of the End node are allocated separately -- their memory
   is not recovered by dead_node_elimination if a End node is dead.
   free_End() frees these data structures. */
void free_End (ir_node *end);


/* We distinguish three kinds of Cond nodes.  These can be distinguished
   by the mode of the selector operand and an internal flag of type cond_kind.
   First we distinguish binary Conds and switch Conds.
   A binary Cond has as selector a boolean value.  Proj(0) projects the control
   flow for case "False", Proj(1) the control flow for "True".  A binary Cond
   is recognized by the boolean selector.
   The switch Cond has as selector an unsigned integer.  It produces as result
   an n+1 Tuple (cf0, ... , cfn) of control flows.
   We differ two flavours of this Cond.  The first, the dense Cond, passes
   control along output i if the selector value is i, 0 <= i <= n.  If the
   selector value is >n it passes control along output n.
   The second Cond flavor diffirences in the treatment of cases not specified in
   the source program.  It magically knows about the existence of Proj nodes.
   It only passes control along output i, 0 <= i <= n, if a node Proj(Cond, i)
   exists.  Else it passes control along output n (even if this Proj does not
   exist.)  This Cond we call "fragmentary".  There is a special constructor
   new_defaultProj that automatically sets the flavor.
   The two switch flavors are distinguished by a flag of type cond_kind.
   Default flavor is "dense"
*/
typedef enum {
  dense,        /**< Default. Missing Proj nodes are dead control flow. */
  fragmentary   /**< Special. No control flow optimizations allowed.  Missing
           Proj nodes mean default control flow, i.e., Proj(n). */
} cond_kind;

ir_node  *get_Cond_selector (ir_node *node);
void      set_Cond_selector (ir_node *node, ir_node *selector);
cond_kind get_Cond_kind (ir_node *node);
void      set_Cond_kind (ir_node *node, cond_kind kind);
long      get_Cond_defaultProj (ir_node *node);

/**
 * Projection numbers for conditions.
 */
typedef enum {
  pn_Cond_false,    /**< Control flow if operand is "false". */
  pn_Cond_true,     /**< Control flow if operand is "true".  */
  pn_Cond_max       /**< number of projections from a Cond */
} pn_Cond;  /* Projection numbers for Cond. */

ir_node  *get_Return_mem (ir_node *node);
void      set_Return_mem (ir_node *node, ir_node *mem);
ir_node **get_Return_res_arr (ir_node *node);
int       get_Return_n_ress (ir_node *node);
ir_node  *get_Return_res (ir_node *node, int pos);
void      set_Return_res (ir_node *node, int pos, ir_node *res);

ir_node *get_Raise_mem (ir_node *node);
void     set_Raise_mem (ir_node *node, ir_node *mem);
ir_node *get_Raise_exo_ptr (ir_node *node);  /* PoinTeR to EXception Object */
void     set_Raise_exo_ptr (ir_node *node, ir_node *exoptr);

/**
 * Projection numbers for Raise.
 */
typedef enum {
  pn_Raise_X,    /**< Execution result. */
  pn_Raise_M,    /**< Memory result.    */
  pn_Raise_max   /**< number of projections from a Raise */
} pn_Raise;  /* Projection numbers for Raise. */

typedef enum {
  CNST_NULL     =  0, /**< The node is a const(0). */
  CNST_ONE      = +1, /**< The node is a const(1). */
  CNST_ALL_ONE  = -1, /**< The node is a const(11111...). */
  CNST_OTHER    =  2, /**< The tarvel of the const has another value. */
  CNST_SYMCONST =  3, /**< The node is symconst. */
  CNST_NO_CONST =  4  /**< The node is no const at all. */
} cnst_classify_t;

tarval  *get_Const_tarval (ir_node *node);
void     set_Const_tarval (ir_node *node, tarval *con);

/**
 * Classify a node concerning constant properties.
 * @param irn A node to check for.
 * @return Constant properties of that node.
 */
cnst_classify_t classify_Const(ir_node *irn);

/** Returns the source language type of a Const node.
 * Must be an atomic type.  Mode of type must be mode of node.
 */
type    *get_Const_type   (ir_node *node);

/** Sets the source language type of a Const node. */
void     set_Const_type   (ir_node *node, type *tp);

/**  This enum names the three different kinds of symbolic Constants
     represented by SymConst.  The content of the attribute type_or_id
     depends on this tag.  Use the proper access routine after testing
     this flag. */
typedef enum {
  symconst_type_tag,    /**< The SymConst is a type tag for the given type.
			   Type_or_id_p is type *. */
  symconst_size,        /**< The SymConst is the size of the given type.
			   Type_or_id_p is type *. */
  symconst_addr_name,   /**< The SymConst is a symbolic pointer to be filled in
			   by the linker.  The pointer is represented by a string.
			   Type_or_id_p is ident *. */
  symconst_addr_ent     /**< The SymConst is a symbolic pointer to be filled in
			   by the linker.  The pointer is represented by an entity.
			   Type_or_id_p is entity *. */
} symconst_kind;

/** SymConst attributes
    This union contains the symbolic information represented by the node  */
union symconst_symbol {
  type   *type_p;
  ident  *ident_p;
  entity *entity_p;
};

typedef union symconst_symbol symconst_symbol;


/** Get the kind of the SymConst. */
symconst_kind get_SymConst_kind (const ir_node *node);
/** Set the kind of the SymConst. */
void          set_SymConst_kind (ir_node *node, symconst_kind num);

/** Only to access SymConst of kind type_tag or size.  Else assertion: */
type    *get_SymConst_type (ir_node *node);
void     set_SymConst_type (ir_node *node, type *tp);

/** Only to access SymConst of kind addr_name.  Else assertion: */
ident   *get_SymConst_name (ir_node *node);
void     set_SymConst_name (ir_node *node, ident *name);

/** Only to access SymConst of kind addr_ent.  Else assertion: */
entity  *get_SymConst_entity (ir_node *node);
void     set_SymConst_entity (ir_node *node, entity *ent);

/** Sets both: type and ptrinfo.  Needed to treat the node independent of
   its semantics.  Does a memcpy for the memory sym points to. */
/* write 'union': firmjni then does not create a method... */
union symconst_symbol get_SymConst_symbol (ir_node *node);
void                  set_SymConst_symbol (ir_node *node,
					   union symconst_symbol sym);

/** Access the type of the value represented by the SymConst.
 *
 *  Example: primitive type int for SymConst size. */
type *get_SymConst_value_type (ir_node *node);
void  set_SymConst_value_type (ir_node *node, type *tp);

ir_node *get_Sel_mem (ir_node *node);
void     set_Sel_mem (ir_node *node, ir_node *mem);
ir_node *get_Sel_ptr (ir_node *node);  /* ptr to the object to select from */
void     set_Sel_ptr (ir_node *node, ir_node *ptr);
ir_node **get_Sel_index_arr (ir_node *node);
int      get_Sel_n_indexs (ir_node *node);
ir_node *get_Sel_index (ir_node *node, int pos);
void     set_Sel_index (ir_node *node, int pos, ir_node *index);
entity  *get_Sel_entity (ir_node *node); /* entity to select */
void     set_Sel_entity (ir_node *node, entity *ent);

/** InstOf access */
type    *get_InstOf_ent (ir_node *node);
void    set_InstOf_ent (ir_node *node, type *ent);
ir_node *get_InstOf_store (ir_node *node);
void    set_InstOf_store (ir_node *node, ir_node *obj);
ir_node *get_InstOf_obj (ir_node *node);
void    set_InstOf_obj (ir_node *node, ir_node *obj);

/**
 * Projection numbers for result of Call node: use for Proj nodes!
 */
typedef enum {
  pn_Call_M_regular = 0,  /**< The memory result. */
  pn_Call_T_result  = 2,  /**< The tuple containing all (0, 1, 2, ...) results */
  pn_Call_P_value_res_base = 4,/**< A pointer to the memory region containing copied results
                 passed by value (for compound result types). */
  pn_Call_X_except  = 1,  /**< The control flow result branching to the exception handler */
  pn_Call_M_except  = 3,  /**< The memory result in case the called method terminated with
                 an exception */
  pn_Call_max       = 5   /**< number of projections from a Call */
} pn_Call;   /* Projection numbers for Call. */

ir_node *get_Call_mem (ir_node *node);
void     set_Call_mem (ir_node *node, ir_node *mem);
ir_node *get_Call_ptr (ir_node *node);
void     set_Call_ptr (ir_node *node, ir_node *ptr);
ir_node **get_Call_param_arr (ir_node *node);
/** Gets the number of parameters of a call. */
int      get_Call_n_params (ir_node *node);
/** Gets the call parameter at position pos. */
ir_node *get_Call_param (ir_node *node, int pos);
/** Sets the call parameter at position pos. */
void     set_Call_param (ir_node *node, int pos, ir_node *param);
/** Gets the type of a call. */
type    *get_Call_type (ir_node *node);
/** Sets the type of a call. */
void     set_Call_type (ir_node *node, type *tp);
/** Gets the arity of a call. Identical to get_Call_n_params(). */
int      get_Call_arity (ir_node *node);

/** Set, get and remove the callee information for a Call node.
 *
 *  The callee information lists all method entities that can be called
 *  from this node.  If the address expression can not be analyzed fully,
 *  e.g., as entities can be called that are not in the compilation unit,
 *  the array contains the unknown_entity.  The array contains only entities
 *  with peculiarity_existent, but with all kinds of visibility.  The entities
 *  not necessarily contain an irg.
 *
 *  The array is only accessible if callee information is valid.  See flag
 *  in graph.
 *
 *  The memory allocated for the array is managed automatically, i.e., it must
 *  not be freed if the Call node is removed from the graph.
 *
 *  @param node A Call node.
 */
int     Call_has_callees      (ir_node *node);
int     get_Call_n_callees    (ir_node *node);
entity *get_Call_callee       (ir_node *node, int pos);

/** Set the full callee array.
 *
 *  The passed array is copied. Assumes current_ir_graph set properly! */
void    set_Call_callee_arr   (ir_node *node, const int n, entity **arr);
void    remove_Call_callee_arr(ir_node *node);

ir_node  *get_CallBegin_ptr  (ir_node *node);
void      set_CallBegin_ptr  (ir_node *node, ir_node *ptr);
ir_node  *get_CallBegin_call (ir_node *node);
void      set_CallBegin_call (ir_node *node, ir_node *call);

/* For unary and binary arithmetic operations the access to the
   operands can be factored out.  Left is the first, right the
   second arithmetic value  as listed in tech report 1999-44.
   unops are: Minus, Abs, Not, Conv, Cast
   binops are: Add, Sub, Mul, Quot, DivMod, Div, Mod, And, Or, Eor, Shl,
   Shr, Shrs, Rot, Cmp */
int      is_unop (const ir_node *node);
ir_node *get_unop_op (ir_node *node);
void     set_unop_op (ir_node *node, ir_node *op);
int      is_binop (const ir_node *node);
ir_node *get_binop_left (ir_node *node);
void     set_binop_left (ir_node *node, ir_node *left);
ir_node *get_binop_right (ir_node *node);
void     set_binop_right (ir_node *node, ir_node *right);

ir_node *get_Add_left (ir_node *node);
void     set_Add_left (ir_node *node, ir_node *left);
ir_node *get_Add_right (ir_node *node);
void     set_Add_right (ir_node *node, ir_node *right);

ir_node *get_Sub_left (ir_node *node);
void     set_Sub_left (ir_node *node, ir_node *left);
ir_node *get_Sub_right (ir_node *node);
void     set_Sub_right (ir_node *node, ir_node *right);

ir_node *get_Minus_op (ir_node *node);
void     set_Minus_op (ir_node *node, ir_node *op);

ir_node *get_Mul_left (ir_node *node);
void     set_Mul_left (ir_node *node, ir_node *left);
ir_node *get_Mul_right (ir_node *node);
void     set_Mul_right (ir_node *node, ir_node *right);

ir_node *get_Quot_left (ir_node *node);
void     set_Quot_left (ir_node *node, ir_node *left);
ir_node *get_Quot_right (ir_node *node);
void     set_Quot_right (ir_node *node, ir_node *right);
ir_node *get_Quot_mem (ir_node *node);
void     set_Quot_mem (ir_node *node, ir_node *mem);

/**
 * Projection numbers for Quot: use for Proj nodes!
 */
typedef enum {
  pn_Quot_M,           /**< Memory result.    */
  pn_Quot_X_except,    /**< Execution result if exception occurred. */
  pn_Quot_res,         /**< Result of computation. */
  pn_Quot_max          /**< number of projections from a Quot */
} pn_Quot;  /* Projection numbers for Quot. */

ir_node *get_DivMod_left (ir_node *node);
void     set_DivMod_left (ir_node *node, ir_node *left);
ir_node *get_DivMod_right (ir_node *node);
void     set_DivMod_right (ir_node *node, ir_node *right);
ir_node *get_DivMod_mem (ir_node *node);
void     set_DivMod_mem (ir_node *node, ir_node *mem);

/**
 * Projection numbers for DivMod: use for Proj nodes!
 */
typedef enum {
  pn_DivMod_M,           /**< Memory result.    */
  pn_DivMod_X_except,    /**< Execution result if exception occurred. */
  pn_DivMod_res_div,     /**< Result of computation a / b. */
  pn_DivMod_res_mod,     /**< Result of computation a % b. */
  pn_DivMod_max          /**< number of projections from a DivMod */
} pn_DivMod;  /* Projection numbers for DivMod. */

ir_node *get_Div_left (ir_node *node);
void     set_Div_left (ir_node *node, ir_node *left);
ir_node *get_Div_right (ir_node *node);
void     set_Div_right (ir_node *node, ir_node *right);
ir_node *get_Div_mem (ir_node *node);
void     set_Div_mem (ir_node *node, ir_node *mem);

/**
 * Projection numbers for Div: use for Proj nodes!
 */
typedef enum {
  pn_Div_M,           /**< Memory result.    */
  pn_Div_X_except,    /**< Execution result if exception occurred. */
  pn_Div_res          /**< Result of computation. */
} pn_Div;  /* Projection numbers for Div. */

ir_node *get_Mod_left (ir_node *node);
void     set_Mod_left (ir_node *node, ir_node *left);
ir_node *get_Mod_right (ir_node *node);
void     set_Mod_right (ir_node *node, ir_node *right);
ir_node *get_Mod_mem (ir_node *node);
void     set_Mod_mem (ir_node *node, ir_node *mem);

/**
 * Projection numbers for Mod: use for Proj nodes!
 */
typedef enum {
  pn_Mod_M,           /**< Memory result.    */
  pn_Mod_X_except,    /**< Execution result if exception occurred. */
  pn_Mod_res,         /**< Result of computation. */
  pn_Mod_max          /**< number of projections from a Mod */
} pn_Mod;  /* Projection numbers for Mod. */

ir_node *get_Abs_op (ir_node *node);
void     set_Abs_op (ir_node *node, ir_node *op);

ir_node *get_And_left (ir_node *node);
void     set_And_left (ir_node *node, ir_node *left);
ir_node *get_And_right (ir_node *node);
void     set_And_right (ir_node *node, ir_node *right);

ir_node *get_Or_left (ir_node *node);
void     set_Or_left (ir_node *node, ir_node *left);
ir_node *get_Or_right (ir_node *node);
void     set_Or_right (ir_node *node, ir_node *right);

ir_node *get_Eor_left (ir_node *node);
void     set_Eor_left (ir_node *node, ir_node *left);
ir_node *get_Eor_right (ir_node *node);
void     set_Eor_right (ir_node *node, ir_node *right);

ir_node *get_Not_op (ir_node *node);
void     set_Not_op (ir_node *node, ir_node *op);

/**
 * Projection numbers for Cmp are defined several times.
 * The bit patterns are used for various tests, so don't change.
 * The "unordered" values are possible results of comparing
 * floating point numbers.
 * Note that the encoding is imported, so do NOT change the order.
 */
typedef enum {
  pn_Cmp_False = 0,                             /**< false */
  pn_Cmp_Eq    = 1,                             /**< equal */
  pn_Cmp_Lt    = 2,                             /**< less */
  pn_Cmp_Le    = pn_Cmp_Eq|pn_Cmp_Lt,           /**< less or equal */
  pn_Cmp_Gt    = 4,                             /**< greater */
  pn_Cmp_Ge    = pn_Cmp_Eq|pn_Cmp_Gt,           /**< greater or equal */
  pn_Cmp_Lg    = pn_Cmp_Lt|pn_Cmp_Gt,           /**< less or greater */
  pn_Cmp_Leg   = pn_Cmp_Lt|pn_Cmp_Eq|pn_Cmp_Gt, /**< less, equal or greater = ordered */
  pn_Cmp_Uo    = 8,                             /**< unordered */
  pn_Cmp_Ue    = pn_Cmp_Uo|pn_Cmp_Eq,           /**< unordered or equal */
  pn_Cmp_Ul    = pn_Cmp_Uo|pn_Cmp_Lt,           /**< unordered or less */
  pn_Cmp_Ule   = pn_Cmp_Uo|pn_Cmp_Eq|pn_Cmp_Lt, /**< unordered, less or equal */
  pn_Cmp_Ug    = pn_Cmp_Uo|pn_Cmp_Gt,           /**< unordered or greater */
  pn_Cmp_Uge   = pn_Cmp_Uo|pn_Cmp_Eq|pn_Cmp_Gt, /**< unordered, greater or equal */
  pn_Cmp_Ne    = pn_Cmp_Uo|pn_Cmp_Lt|pn_Cmp_Gt, /**< unordered, less or greater = not equal */
  pn_Cmp_True  = 15                             /**< true */
  /* not_mask = Leg*/   /* bits to flip to negate comparison * @@ hack for jni interface */
} pn_Cmp;   /* Projection numbers for Cmp */
/* #define not_mask pn_Cmp_Leg */

/** returns the pnc name from an pnc constant */
const char *get_pnc_string(int pnc);

/** Calculates the negated pnc condition. */
int         get_negated_pnc(int pnc);

/** Calculates the swapped pnc condition, i.e., "<" --> ">" */
int         get_swapped_pnc(int pnc);

ir_node *get_Cmp_left (ir_node *node);
void     set_Cmp_left (ir_node *node, ir_node *left);
ir_node *get_Cmp_right (ir_node *node);
void     set_Cmp_right (ir_node *node, ir_node *right);

ir_node *get_Shl_left (ir_node *node);
void     set_Shl_left (ir_node *node, ir_node *left);
ir_node *get_Shl_right (ir_node *node);
void     set_Shl_right (ir_node *node, ir_node *right);

ir_node *get_Shr_left (ir_node *node);
void     set_Shr_left (ir_node *node, ir_node *left);
ir_node *get_Shr_right (ir_node *node);
void     set_Shr_right (ir_node *node, ir_node *right);

ir_node *get_Shrs_left (ir_node *node);
void     set_Shrs_left (ir_node *node, ir_node *left);
ir_node *get_Shrs_right (ir_node *node);
void     set_Shrs_right (ir_node *node, ir_node *right);

ir_node *get_Rot_left (ir_node *node);
void     set_Rot_left (ir_node *node, ir_node *left);
ir_node *get_Rot_right (ir_node *node);
void     set_Rot_right (ir_node *node, ir_node *right);

ir_node *get_Conv_op (ir_node *node);
void     set_Conv_op (ir_node *node, ir_node *op);

/* Does Cast need a mem operator?
 * Cast should only depend on the type, not on the state of an
 * entity.  But:  we initialize various fields after Alloc, that
 * are accessed in the cast.  This required some precaution, to
 * get the right memory into the Loads generated from the cast.
 */
ir_node *get_Cast_op (ir_node *node);
void     set_Cast_op (ir_node *node, ir_node *op);
type    *get_Cast_type (ir_node *node);
void     set_Cast_type (ir_node *node, type *to_tp);

/** Checks for upcast.
 *
 * Returns true if the Cast node casts a class type to a super type.
 * Works also for pointers to classes (recursively).
 */
int is_Cast_upcast(ir_node *node);

/** Checks for downcast.
 *
 * Returns true if the Cast node casts a class type to a sub type.
 * Works also for pointers to classes (recursively).
 */
int is_Cast_downcast(ir_node *node);


/** Returns true if n is Phi or Filter in interprocedural_view.
   Returns false if irg in phase building and the Phi has zero
   predecessors: it's a Phi0. */
int       is_Phi (const ir_node *n);
/** Returns true  if irg in phase building and the Phi has zero
   predecessors: it's a Phi0. */
int       is_Phi0 (const ir_node *n);
/* These routines also work for Filter nodes in interprocedural view. */
ir_node **get_Phi_preds_arr (ir_node *node);
int       get_Phi_n_preds (ir_node *node);
ir_node  *get_Phi_pred (ir_node *node, int pos);
void      set_Phi_pred (ir_node *node, int pos, ir_node *pred);

ir_node  *get_Filter_pred(ir_node *node);
void      set_Filter_pred(ir_node *node, ir_node *pred);
long      get_Filter_proj(ir_node *node);
void      set_Filter_proj(ir_node *node, long proj);
/* set the interprocedural predecessors, ...d_arr uses current_ir_graph.
 * @@@ Maybe better:  arity is zero if no cg preds. */
void     set_Filter_cg_pred_arr(ir_node * node, int arity, ir_node ** in);
void     set_Filter_cg_pred(ir_node * node, int pos, ir_node * pred);
int      get_Filter_n_cg_preds(ir_node *node);
ir_node *get_Filter_cg_pred(ir_node *node, int pos);

/** Return true if parameter is a memory operation.
 *
 *  A memory operation is an operation that changes the
 *  memory.  I.e., a Load or a Store operation.
 */
int is_memop(ir_node *node);
ir_node *get_memop_mem (ir_node *node);
void     set_memop_mem (ir_node *node, ir_node *mem);
ir_node *get_memop_ptr (ir_node *node);
void     set_memop_ptr (ir_node *node, ir_node *ptr);

/**
 * Projection numbers for Load: use for Proj nodes!
 */
typedef enum {
  pn_Load_M,         /**< Memory result.    */
  pn_Load_X_except,  /**< Execution result if exception occurred. */
  pn_Load_res,       /**< Result of load operation. */
  pn_Load_max        /**< number of projections from a Load */
} pn_Load;  /* Projection numbers for Load. */

ir_node       *get_Load_mem (ir_node *node);
void           set_Load_mem (ir_node *node, ir_node *mem);
ir_node       *get_Load_ptr (ir_node *node);
void           set_Load_ptr (ir_node *node, ir_node *ptr);
ir_mode       *get_Load_mode (ir_node *node);
void           set_Load_mode (ir_node *node, ir_mode *mode);
ent_volatility get_Load_volatility (ir_node *node);
void           set_Load_volatility (ir_node *node, ent_volatility volatility);

/**
 * Projection numbers for Store: use for Proj nodes!
 */
typedef enum {
  pn_Store_M,         /**< Memory result.    */
  pn_Store_X_except,  /**< Execution result if exception occurred. */
  pn_Store_max        /**< number of projections from a Store */
} pn_Store;  /* Projection numbers for Store. */

ir_node       *get_Store_mem (ir_node *node);
void           set_Store_mem (ir_node *node, ir_node *mem);
ir_node       *get_Store_ptr (ir_node *node);
void           set_Store_ptr (ir_node *node, ir_node *ptr);
ir_node       *get_Store_value (ir_node *node);
void           set_Store_value (ir_node *node, ir_node *value);
ent_volatility get_Store_volatility (ir_node *node);
void           set_Store_volatility (ir_node *node, ent_volatility volatility);

/**
 * Projection numbers for Alloc: use for Proj nodes!
 */
typedef enum {
  pn_Alloc_M,          /**< Memory result. */
  pn_Alloc_X_except,  /**< Execution result if exception occurred. */
  pn_Alloc_res,       /**< Result of allocation. */
  pn_Alloc_max        /**< number of projections from an Alloc */
} pn_Alloc;  /* Projection numbers for Alloc. */

ir_node *get_Alloc_mem (ir_node *node);
void     set_Alloc_mem (ir_node *node, ir_node *mem);
ir_node *get_Alloc_size (ir_node *node);
void     set_Alloc_size (ir_node *node, ir_node *size);
type    *get_Alloc_type (ir_node *node);
void     set_Alloc_type (ir_node *node, type *tp);

/** The allocation place. */
typedef enum {
  stack_alloc,          /**< Alloc allocates the object on the stack. */
  heap_alloc            /**< Alloc allocates the object on the heap. */
} where_alloc;

where_alloc  get_Alloc_where (ir_node *node);
void         set_Alloc_where (ir_node *node, where_alloc where);

ir_node *get_Free_mem (ir_node *node);
void     set_Free_mem (ir_node *node, ir_node *mem);
ir_node *get_Free_ptr (ir_node *node);
void     set_Free_ptr (ir_node *node, ir_node *ptr);
ir_node *get_Free_size (ir_node *node);
void     set_Free_size (ir_node *node, ir_node *size);
type    *get_Free_type (ir_node *node);
void     set_Free_type (ir_node *node, type *tp);

where_alloc  get_Free_where (ir_node *node);
void         set_Free_where (ir_node *node, where_alloc where);

ir_node **get_Sync_preds_arr (ir_node *node);
int       get_Sync_n_preds (ir_node *node);
ir_node  *get_Sync_pred (ir_node *node, int pos);
void      set_Sync_pred (ir_node *node, int pos, ir_node *pred);

/** Returns the source language type of a Proj node.
 * Must be an atomic type.  Mode of type must be mode of node.
 */
type     *get_Proj_type (ir_node *node);

/** Return the predecessor of a Proj node. */
ir_node  *get_Proj_pred (ir_node *node);
void      set_Proj_pred (ir_node *node, ir_node *pred);
/** Return the projection number of a Proj node. */
long      get_Proj_proj (ir_node *node);
void      set_Proj_proj (ir_node *node, long proj);

ir_node **get_Tuple_preds_arr (ir_node *node);
int       get_Tuple_n_preds (ir_node *node);
ir_node  *get_Tuple_pred (ir_node *node, int pos);
void      set_Tuple_pred (ir_node *node, int pos, ir_node *pred);

ir_node  *get_Id_pred (ir_node *node);
void      set_Id_pred (ir_node *node, ir_node *pred);

/** Confirm has a single result and returns 'value' unchanged.
 *  The node expresses a restriction on 'value':
 *  'value' 'cmp' 'bound' == true.                                 */
ir_node *get_Confirm_value (ir_node *node);
void     set_Confirm_value (ir_node *node, ir_node *value);
ir_node *get_Confirm_bound (ir_node *node);
void     set_Confirm_bound (ir_node *node, ir_node *bound);
pn_Cmp   get_Confirm_cmp   (ir_node *node);
void     set_Confirm_cmp   (ir_node *node, pn_Cmp cmp);

ir_node *get_Mux_sel   (ir_node *node);
void     set_Mux_sel   (ir_node *node, ir_node *sel);
ir_node *get_Mux_false (ir_node *node);
void     set_Mux_false (ir_node *node, ir_node *ir_false);
ir_node *get_Mux_true  (ir_node *node);
void     set_Mux_true  (ir_node *node, ir_node *ir_true);


/*
 *
 * NAME Auxiliary routines
 *
 *  Not properly documented ;-)
 *
 */

/** returns operand of node if node is a Proj. */
ir_node *skip_Proj (ir_node *node);
/** returns operand of node if node is a Id */
ir_node *skip_Id  (ir_node *node);   /* Same as skip_nop. */
/* returns corresponding operand of Tuple if node is a Proj from
   a Tuple. */
ir_node *skip_Tuple (ir_node *node);
/** returns operand of node if node is a Cast */
ir_node *skip_Cast  (ir_node *node);
/** returns operand of node if node is a Confirm */
ir_node *skip_Confirm  (ir_node *node);
/** Skip all high-level Operations. */
ir_node *skip_HighLevel(ir_node *node);
/** returns true if irn is a Const node. */
int			 is_Const(const ir_node *node);
/** returns true if node is a Bad node. */
int      is_Bad    (const ir_node *node);
/** returns true if the node is not a Block */
int      is_no_Block (const ir_node *node);
/** returns true if the node is a Block */
int      is_Block (const ir_node *node);
/** returns true if node is a Unknown node. */
int      is_Unknown (const ir_node *node);
/** returns true if node is a Proj node or a Filter node in
 * intraprocedural view */
int      is_Proj (const ir_node *node);
/** Returns true if the operation manipulates control flow:
   Start, End, Jmp, Cond, Return, Raise, Bad, CallBegin, EndReg, EndExcept */
int is_cfop(const ir_node *node);

/** Returns true if the operation manipulates interprocedural control flow:
    CallBegin, EndReg, EndExcept */
int is_ip_cfop(const ir_node *node);
/** Returns true if the operation can change the control flow because
    of an exception: Call, Quot, DivMod, Div, Mod, Load, Store, Alloc,
    Bad. Raise is not fragile, but a unconditional jump. */
int is_fragile_op(const ir_node *node);
/** Returns the memory operand of fragile operations. */
ir_node *get_fragile_op_mem(ir_node *node);

/** Returns true if the operation is a forking control flow
 *  operation: Cond. */
int is_forking_op(const ir_node *node);

/** Return the type associated with the value produced by n
 *  if the node remarks this type as it is the case for
 *  Cast, Const, SymConst and some Proj nodes. */
type *get_irn_type(ir_node *n);

/**
 * Access custom node data.
 * The data must have been registered with
 * register_additional_node_data() before.
 * @param node The ir node to get the data from.
 * @param type The type of the data you registered.
 * @param off The value returned by register_additional_node_data().
 * @return A pointer of type @p type.
 */
#define get_irn_data(node,type,off) \
  (assert(off > 0 && "Invalid node data offset"), (type *) ((char *) (node) - (off)))

/**
 * Get the pointer to the node some custom data belongs to.
 * @param data The pointer to the custom data.
 * @param off The number as returned by register_additional_node_data().
 * @return A pointer to the ir node the custom data belongs to.
 */
#define get_irn_data_base(data,off) \
  (assert(off > 0 && "Invalid node data offset"), (ir_node *) ((char *) (data) + (off)))

/**
 * Request additional data to be allocated with an ir node.
 * @param size The size of the additional data required.
 * @return A positive number, if the operation was successful, which
 * must be passed to the access macro get_irn_data(), 0 if the
 * registration failed.
 */
unsigned register_additional_node_data(unsigned size);


/*-----------------------------------------------------------------*/
/** Debug aides                                                   **/
/*-----------------------------------------------------------------*/


/** Debug print the node.
 *
 *  Writes the node, all its attributes and the predecessors to stdout if DEBUG_libfirm
 *  is set.  Else does nothing. */