irnode.h

/*
 * Copyright (C) 1995-2007 University of Karlsruhe.  All right reserved.
 *
 * This file is part of libFirm.
 *
 * This file may be distributed and/or modified under the terms of the
 * GNU General Public License version 2 as published by the Free Software
 * Foundation and appearing in the file LICENSE.GPL included in the
 * packaging of this file.
 *
 * Licensees holding valid libFirm Professional Edition licenses may use
 * this file in accordance with the libFirm Commercial License.
 * Agreement provided with the Software.
 *
 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE.
 */

/**
 * @file
 * @brief   Representation of an intermediate operation.
 * @author  Martin Trapp, Christian Schaefer, Goetz Lindenmaier, Michael Beck
 * @version $Id$
 */
#ifndef FIRM_IR_IRNODE_H
#define FIRM_IR_IRNODE_H

#include <stddef.h>

#include "firm_common.h"
#include "typerep.h"
#include "irop.h"
#include "irmode.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.
 * @{
 */

/**
 *   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.
 * This function automatically handles intra- and interprocedural views.
 */
ir_node *get_irn_n(const ir_node *node, int n);

/**
* Add a artificial dependency to the node.
* The dependency is only inserted if it is not there already.
* @param node The node.
* @param dep  The dependency target.
* @return The index in the array (get_irn_dep() with that index returns @p dep).
*/
int add_irn_dep(ir_node *node, ir_node *dep);

/**
 * Copy all dependencies from a node to another.
 * @param tgt The node which should be enriched.
 * @param src The node whose dependencies shall be copied.
 */
void add_irn_deps(ir_node *tgt, ir_node *src);

/**
* Get the length of the dependency array.
* @param node The node.
* @return The length of the dependency array or 0 if it has not yet been allocated.
*/
int get_irn_deps(const ir_node *node);

/**
* Get an entry of the dependency array.
* @param node The node.
* @param pos  The position.
* @return The node at that position.
*/
ir_node *get_irn_dep(const ir_node *node, int pos);

/**
* Set an entry of the dependency array.
* @param node The node.
* @param pos  The position.
* @param dep  The dependency target.
*/
void set_irn_dep(ir_node *node, int pos, ir_node *dep);


/**
 * Get the n-th predecessor of a node in intraprocedural view.
 * Can be used always if it's know that node is not a split one.
 */
ir_node *get_irn_intra_n(const ir_node *node, int n);

/**
 * Get the n-th predecessor of a node in interprocedural view.
 */
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);
/**
 * Appends a new predecessor to a node. This only works for nodes with
 * variable arity!
 * @returns   the number of the new input
 */
int add_irn_n(ir_node *node, 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. */
ir_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);
/** If arg is an argument of the node, returns it's position, -1 otherwise */
int get_irn_pred_pos(ir_node *node, ir_node *arg);
/** 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.
 *
 *  Returns whether the node _always_ must be pinned.
 *  I.e., the node is not floating after global cse.
 *
 * @returns Either state op_pin_state_pinned or op_pin_state_floats.
 */
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);

/** Returns whether the node is currently pinned.
 *
 * If get_irn_pinned returns op_pin_state_floats and the graph the
 * node belongs to is in state op_poin_state_floats then this function
 * returns 'floats', else 'pinned'.
 */
op_pin_state is_irn_pinned_in_irg(const ir_node *node);

/**
 * IR node constructor.
 * Create a new IR node in irg, with an op, mode, arity and
 * some incoming IR nodes.
 * This constructor is used in every specific IR node constructor.
 *
 * @param db    Debug info.
 * @param irg   IR-graph on with this new node should be constructed.
 * @param block The block the new node belongs to
 * @param op    The opcode of the new node.
 * @param mode  The mode of the new node.
 * @param arity The arity of the new node, <0 if can be changed dynamically.
 * @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 is only
 * possible for pinned nodes or if the graph is in pinned state.
 * Otherwise the block may be incorrect.  This condition is
 * now checked by an assertion.
 *
 * 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.  Use for
                                  position independent data/code access. */
  pn_Start_P_tls,            /**< Projection on the pointer to the thread local store
                                  segment containing _all_thread local variables. */
  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. */
ir_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. */
ir_type *is_globals_pointer(ir_node *n);

/** Test whether arbitrary node is tls pointer.
 *
 * Test whether arbitrary node is tls pointer, i.e. Proj(pn_Start_P_tls)
 * from Start.  If so returns tls type, else Null. */
ir_type *is_tls_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(const 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);
/** Get the predecessor block.
 *
 *  Returns the block corresponding to the predecessor pos of block.
 *
 *  There are several ambiguities we resolve with this function:
 *  - The direct predecessor can be a Proj, which is not pinned.
 *    We walk from the predecessor to the next pinned node
 *    (skip_Proj) and return the block that node is in.
 *  - If we encounter the Bad node, this function does not return
 *    Start, but the Bad node.
 */
ir_node  *get_Block_cfgpred_block(ir_node *node, int pos);
int       get_Block_matured(ir_node *node);
void      set_Block_matured(ir_node *node, int 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(const ir_node *node);
void      set_Block_block_visited(ir_node *node, unsigned long visit);

/**
 * Marks a block as dead but do not replace it with a Bad node.
 * Dead blocks are removed in the con
 */
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(const ir_node *node);
int       Block_block_visited(const 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 allocated for interprocedural predecessors. */
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);

/** Get the Macro Block header of a (sub-) block. */
ir_node *get_Block_MacroBlock(const ir_node *block);

/** 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);

/** Set new keep-alives */
void set_End_keepalives(ir_node *end, int n, ir_node *in[]);

/* Set new keep-alives from old keep-alives, skipping irn */
void remove_End_keepalive(ir_node *end, ir_node *irn);

/** 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);

/** Return the target address of an IJmp */
ir_node *get_IJmp_target(ir_node *ijmp);

/** Sets the target address of an IJmp */
void set_IJmp_target(ir_node *ijmp, ir_node *tgt);

/* 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 flavors 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 differences 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);

/**
 * Possible classes for constant classification.
 */
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 tarval 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(const 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.
 */
ir_type  *get_Const_type(ir_node *node);

/** Sets the source language type of a Const node. */
void     set_Const_type(ir_node *node, ir_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.
                             symconst_symbol is type *. */
  symconst_type_size,   /**< The SymConst is the size of the given type.
                             symconst_symbol is type *. */
  symconst_type_align,  /**< The SymConst is the alignment of the given type.
                             symconst_symbol 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.
                             symconst_symbol 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.
                             symconst_symbol is entity *. */
  symconst_ofs_ent,     /**< The SymConst is the offset of its entity in the entities
                             owner type. */
  symconst_enum_const   /**< The SymConst is a enumeration constant of an
                             enumeration type. */
} symconst_kind;

/** Returns non-zero if s symconst kind has a type attribute */
#define SYMCONST_HAS_TYPE(kind) ((kind) <= symconst_type_align)

/** Returns non-zero if s symconst kind has an ident attribute */
#define SYMCONST_HAS_ID(kind) ((kind) == symconst_addr_name)

/** Returns non-zero if s symconst kind has an entity attribute */
#define SYMCONST_HAS_ENT(kind) ((kind) == symconst_addr_ent || (kind) == symconst_ofs_ent)

/** Returns non-zero if s symconst kind has an enum_const attribute */
#define SYMCONST_HAS_ENUM(kind) ((kind) == symconst_enum_const)

/** SymConst attribute.
 *
 *  This union contains the symbolic information represented by the node.
 */
typedef union symconst_symbol {
  ir_type       *type_p;    /**< the type of a symconst */
  ident         *ident_p;   /**< the ident of a symconst */
  ir_entity     *entity_p;  /**< the entity of a symconst */
  ir_enum_const *enum_p;    /**< the enumeration constant of a symconst */
} 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: */
ir_type  *get_SymConst_type(ir_node *node);
void     set_SymConst_type(ir_node *node, ir_type *tp);

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

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

/** Only to access SymConst of kind symconst_enum_const.  Else assertion: */
ir_enum_const *get_SymConst_enum(const ir_node *node);
void           set_SymConst_enum(ir_node *node, ir_enum_const *ec);

/** 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(const 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. */
ir_type *get_SymConst_value_type(ir_node *node);
void    set_SymConst_value_type(ir_node *node, ir_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);
ir_entity *get_Sel_entity(ir_node *node); /* entity to select */
void       set_Sel_entity (ir_node *node, ir_entity *ent);

/**
 * Projection numbers for result of Call node: use for Proj nodes!
 */
typedef enum {
  pn_Call_M_regular = 0,       /**< The memory result. */
  pn_Call_X_regular = 1,       /**< The control flow result when no exception occurs. */
  pn_Call_X_except  = 2,       /**< The control flow result branching to the exception handler. */
  pn_Call_T_result  = 3,       /**< The tuple containing all (0, 1, 2, ...) results. */
  pn_Call_M_except  = 4,       /**< The memory result in case the called method terminated with
                                    an exception. */
  pn_Call_P_value_res_base = 5,/**< A pointer to the memory region containing copied results
                                    passed by value (for compound result types). */
  pn_Call_max       = 6        /**< number of projections from a Call */
} pn_Call;   /* Projection numbers for Call. */
#define pn_Call_M pn_Call_M_regular

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. */
ir_type *get_Call_type(ir_node *node);
/** Sets the type of a call. */
void     set_Call_type(ir_node *node, ir_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);
ir_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, ir_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(const 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(const ir_node *node);
void     set_binop_left(ir_node *node, ir_node *left);
ir_node *get_binop_right(const ir_node *node);
void     set_binop_right(ir_node *node, ir_node *right);

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

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

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

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

ir_node *get_Quot_left(const ir_node *node);
void     set_Quot_left(ir_node *node, ir_node *left);
ir_node *get_Quot_right(const 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);
ir_mode *get_Quot_resmode(const ir_node *node);
void     set_Quot_resmode(ir_node *node, ir_mode *mode);

/**
 * Projection numbers for Quot: use for Proj nodes!
 */
typedef enum {
  pn_Quot_M,           /**< Memory result. */
  pn_Quot_X_regular,   /**< Execution result if no exception occurred. */
  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(const ir_node *node);
void     set_DivMod_left(ir_node *node, ir_node *left);
ir_node *get_DivMod_right(const 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);
ir_mode *get_DivMod_resmode(const ir_node *node);
void     set_DivMod_resmode(ir_node *node, ir_mode *mode);

/**
 * Projection numbers for DivMod: use for Proj nodes!
 */
typedef enum {
  pn_DivMod_M,           /**< Memory result. */
  pn_DivMod_X_regular,   /**< Execution result if no exception occurred. */
  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(const ir_node *node);
void     set_Div_left(ir_node *node, ir_node *left);
ir_node *get_Div_right(const 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);
ir_mode *get_Div_resmode(const ir_node *node);
void     set_Div_resmode(ir_node *node, ir_mode *mode);

/**
 * Projection numbers for Div: use for Proj nodes!
 */
typedef enum {
  pn_Div_M,           /**< Memory result. */
  pn_Div_X_regular,   /**< Execution result if no exception occurred. */
  pn_Div_X_except,    /**< Execution result if exception occurred. */
  pn_Div_res,         /**< Result of computation. */
  pn_Div_max          /**< number of projections from a Div */
} pn_Div;  /* Projection numbers for Div. */

ir_node *get_Mod_left(const ir_node *node);
void     set_Mod_left(ir_node *node, ir_node *left);
ir_node *get_Mod_right(const 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);
ir_mode *get_Mod_resmode(const ir_node *node);
void     set_Mod_resmode(ir_node *node, ir_mode *mode);

/**
 * Projection numbers for Mod: use for Proj nodes!
 */
typedef enum {
  pn_Mod_M,           /**< Memory result.    */
  pn_Mod_X_regular,   /**< Execution result if no exception occurred. */
  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(const ir_node *node);
void     set_Abs_op(ir_node *node, ir_node *op);

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

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

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

ir_node *get_Not_op(const 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 (Complement(R)) pnc condition. */
int         get_negated_pnc(int pnc, ir_mode *mode);

/** Calculates the inversed (R^-1) pnc condition, i.e., "<" --> ">" */
int         get_inversed_pnc(int pnc);

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

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

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

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

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

ir_node *get_Conv_op(const ir_node *node);
void     set_Conv_op(ir_node *node, ir_node *op);
int      get_Conv_strict(ir_node *node);
void     set_Conv_strict(ir_node *node, int flag);

/* 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(const ir_node *node);