Try fixing if-conversion in presence of endless loops.

[libfirm] / include / libfirm / irnode.h

/*
 * Copyright (C) 1995-2008 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 "begin.h"
#include "nodeops.h"

/**
 * @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:
 *
 *  - 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.
 * @{
 */

/**
 *   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
 */
FIRM_API int is_ir_node (const void *thing);

/**
 * Returns the number of predecessors without the block predecessor.
 *
 * @param node   the IR-node
 */
FIRM_API int get_irn_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. */
FIRM_API 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.
 */
FIRM_API 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.
 * This is only allowed in phase_backend!
 *
 * @param node The node.
 * @param dep  The dependency target.
 *
 * @return The index in the array (get_irn_dep with that index returns @p dep).
 */
FIRM_API int add_irn_dep(ir_node *node, ir_node *dep);

/**
 * Copy all dependencies from a node to another.
 * This is only allowed in phase_backend!
 *
 * @param tgt The node which should be enriched.
 * @param src The node whose dependencies shall be copied.
 */
FIRM_API 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.
 */
FIRM_API 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.
 */
FIRM_API 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.
 */
FIRM_API void set_irn_dep(ir_node *node, int pos, ir_node *dep);

/** Replace the n-th predecessor of a node with a new one. */
FIRM_API 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
 */
FIRM_API int add_irn_n(ir_node *node, ir_node *in);
/* Remove predecessor i from Sync n */
FIRM_API void del_Sync_n(ir_node *n, int i);
/* Sets the mode struct of node.  */
FIRM_API void set_irn_mode(ir_node *node, ir_mode *mode);
/** Gets the mode struct of a node.  */
FIRM_API ir_mode *get_irn_mode(const ir_node *node);
/** Gets the opcode struct of the node. */
FIRM_API ir_op *get_irn_op(const ir_node *node);
/** Sets the opcode struct of the node. */
FIRM_API void set_irn_op(ir_node *node, ir_op *op);
/** Gets the opcode-enum of the node. */
FIRM_API unsigned get_irn_opcode(const ir_node *node);
/** Get the string representation of the opcode. */
FIRM_API const char *get_irn_opname(const ir_node *node);
/** Get the ident for a string representation of the opcode. */
FIRM_API ident *get_irn_opident(const ir_node *node);
/** If arg is an argument of the node, returns its position, -1 otherwise */
FIRM_API int get_irn_pred_pos(ir_node *node, ir_node *arg);
/** Gets the visited counter of a node. */
FIRM_API ir_visited_t get_irn_visited(const ir_node *node);
/** Sets the visited counter of a node. */
FIRM_API void set_irn_visited(ir_node *node, ir_visited_t visited);
/** Sets visited to get_irg_visited(current_ir_graph). */
FIRM_API void mark_irn_visited(ir_node *node);
/** Returns 1 if visited >= get_irg_visited(current_ir_graph). */
FIRM_API int irn_visited(const ir_node *node);
/** Returns 1 if visited >= get_irg_visited(current_ir_graph). Marks the node
 * visited, if it was not. */
FIRM_API int irn_visited_else_mark(ir_node *node);

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

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

/** Returns the ir_graph this node belongs to. */
FIRM_API 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. */
FIRM_API 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.
 */
FIRM_API op_pin_state get_irn_pinned(const ir_node *node);

/** Set pin state for nodes with op pin state op_pin_state_exc_pinned */
FIRM_API 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'.
 */
FIRM_API 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.
 */
FIRM_API ir_node *new_ir_node(dbg_info *db, ir_graph *irg, ir_node *block,
                              ir_op *op, ir_mode *mode,
                              int arity, ir_node *const *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(). */
FIRM_API ir_node *get_nodes_block (const ir_node *node);

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

/** 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. */
FIRM_API ir_type *is_frame_pointer(const ir_node *n);

/** Return the number of control flow predecessors of a block. */
FIRM_API int get_Block_n_cfgpreds(const ir_node *block);
/** Return the control flow predecessor of a block at a given position. */
FIRM_API ir_node *get_Block_cfgpred(const ir_node *block, int pos);
/** Set the control flow predecessor of a block at a given position. */
FIRM_API void set_Block_cfgpred(ir_node *block, int pos, ir_node *pred);

/**
 * Return the position of the predecessor block pred in the inputs
 * of the block block.
 *
 * @param block  the block
 * @param pred   a predecessor block of block
 *
 * @return the position of pred in block or -1
 *
 * @note When using the old extended basic block form for blocks
 * with exception exists, a predecessor block might have more
 * than one position. In that case it is not specified, with is returned.
 */
FIRM_API int get_Block_cfgpred_pos(const ir_node *block, const 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 block, but the Bad node.
 */
FIRM_API ir_node *get_Block_cfgpred_block(const ir_node *node, int pos);

/** Return the matured flag of a block */
FIRM_API int get_Block_matured(const ir_node *block);
/** set the matured flag of a block. */
FIRM_API void set_Block_matured(ir_node *block, int matured);

/** A visited flag only for block nodes.
 *  @see also: get_irn_visited() inc_irg_visited() inc_irg_block_visited()*/
FIRM_API ir_visited_t get_Block_block_visited(const ir_node *block);
FIRM_API void set_Block_block_visited(ir_node *block, ir_visited_t visit);

/**
 * Marks a block as dead but do not replace it with a Bad node.
 * Dead blocks are removed in the con
 */
FIRM_API ir_node *set_Block_dead(ir_node *block);
FIRM_API int is_Block_dead(const ir_node *block);

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

/** Returns the extended basic block a block belongs to. */
FIRM_API ir_extblk *get_Block_extbb(const ir_node *block);
/** Sets the extended basic block a block belongs to. */
FIRM_API void set_Block_extbb(ir_node *block, ir_extblk *extblk);
/** Returns the ir_graph this Block belongs to. */
FIRM_API ir_graph *get_Block_irg(const ir_node *block);
/** Returns non-zero if the block has an entity assigned */
FIRM_API int has_Block_entity(const ir_node *block);
/** Returns the entity for a Block */
FIRM_API ir_entity *get_Block_entity(const ir_node *block);
/** Returns the entity for a Block (creating it if necessary) */
FIRM_API ir_entity *create_Block_entity(ir_node *block);
/** Set a new entity for a block */
FIRM_API void set_Block_entity(ir_node *block, ir_entity *entity);
/** Gets the head of the Phi list for this block. */
FIRM_API ir_node *get_Block_phis(const ir_node *block);
/** Sets the head of the Phi list for this block. */
FIRM_API void set_Block_phis(ir_node *block, ir_node *phi);
/** Add a Phi node to the list of Block Phi's. */
FIRM_API void add_Block_phi(ir_node *block, ir_node *phi);
/** Get the Block mark (single bit). */
FIRM_API unsigned get_Block_mark(const ir_node *block);
/** Set the Block mark (single bit). */
FIRM_API void set_Block_mark(ir_node *block, unsigned mark);

/** Return the number of Keep alive node. */
FIRM_API int get_End_n_keepalives(const ir_node *end);
/** Return the Keep alive node a position pos. */
FIRM_API ir_node *get_End_keepalive(const ir_node *end, int pos);
/** Keep alive dedicated nodes.  These must be either PhiM or Block nodes. */
FIRM_API void add_End_keepalive(ir_node *end, ir_node *ka);
/** Set the Keep alive node at position pos. */
FIRM_API void set_End_keepalive(ir_node *end, int pos, ir_node *ka);

/**
 * Set new keep-alives.
 * Beware: This might be an expensive operation if dynamic edges are enabled,
 * so avoid it in the backend.
 */
FIRM_API void set_End_keepalives(ir_node *end, int n, ir_node *in[]);

/** Remove irn from the keep-alive set. */
FIRM_API void remove_End_keepalive(ir_node *end, ir_node *irn);

/* Remove Bads, NoMem and doublets from the keep-alive set. */
FIRM_API void remove_End_Bads_and_doublets(ir_node *end);

/** 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. */
FIRM_API void free_End(ir_node *end);

FIRM_API ir_node **get_Return_res_arr(ir_node *node);
FIRM_API size_t    get_Return_n_ress(const ir_node *node);
FIRM_API ir_node  *get_Return_res(const ir_node *node, int pos);
FIRM_API void      set_Return_res(ir_node *node, int pos, ir_node *res);

/** Return non-zero if the given Const node represents the 0 constant. */
FIRM_API int is_Const_null(const ir_node *node);

/** Return non-zero if the given Const node represents the 1 constant. */
FIRM_API int is_Const_one(const ir_node *node);

/** Return non-zero if the given Const node represents the constant with all bits set. */
FIRM_API int is_Const_all_one(const ir_node *node);

/** Returns true if a node is a Conv node with strict attribute set. */
FIRM_API int is_strictConv(const ir_node *node);

/** Returns true if node is a SymConst node with kind symconst_addr_ent. */
FIRM_API int is_SymConst_addr_ent(const ir_node *node);

/** 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 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)

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

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

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

/** Only to access SymConst of kind symconst_enum_const.  Else assertion: */
FIRM_API ir_enum_const *get_SymConst_enum(const ir_node *node);
FIRM_API 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... */
FIRM_API union symconst_symbol get_SymConst_symbol(const ir_node *node);
FIRM_API void                  set_SymConst_symbol(ir_node *node,
                                                   union symconst_symbol sym);

FIRM_API ir_node   **get_Sel_index_arr(ir_node *node);
FIRM_API int        get_Sel_n_indexs(const ir_node *node);
FIRM_API ir_node   *get_Sel_index(const ir_node *node, int pos);
FIRM_API void       set_Sel_index(ir_node *node, int pos, ir_node *index);

FIRM_API ir_node **get_Call_param_arr(ir_node *node);
/** Gets the number of parameters of a call. */
FIRM_API size_t   get_Call_n_params(const ir_node *node);
/** Gets the call parameter at position pos. */
FIRM_API ir_node *get_Call_param(const ir_node *node, int pos);
/** Sets the call parameter at position pos. */
FIRM_API void     set_Call_param(ir_node *node, int pos, ir_node *param);

/**
 * Returns non-zero if a Call is surely a self-recursive Call.
 * Beware: if this functions returns 0, the call might be self-recursive!
 */
FIRM_API int is_self_recursive_Call(const ir_node *call);

/** 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.
 */
FIRM_API int        Call_has_callees(const ir_node *node);
FIRM_API size_t     get_Call_n_callees(const ir_node *node);
FIRM_API ir_entity *get_Call_callee(const ir_node *node, size_t pos);

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

FIRM_API ir_node         **get_Builtin_param_arr(ir_node *node);
/** Gets the number of parameters of a Builtin. */
FIRM_API int             get_Builtin_n_params(const ir_node *node);
/** Gets the Builtin parameter at position pos. */
FIRM_API ir_node         *get_Builtin_param(const ir_node *node, int pos);
/** Sets the Builtin parameter at position pos. */
FIRM_API void            set_Builtin_param(ir_node *node, int pos, ir_node *param);
/** Returns a human readable string for the ir_builtin_kind. */
FIRM_API const char *get_builtin_kind_name(ir_builtin_kind kind);

/* 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, Div, Mod, And, Or, Eor, Shl,
   Shr, Shrs, Rotl, Cmp */
FIRM_API int      is_unop(const ir_node *node);
FIRM_API ir_node *get_unop_op(const ir_node *node);
FIRM_API void     set_unop_op(ir_node *node, ir_node *op);
FIRM_API int      is_binop(const ir_node *node);
FIRM_API ir_node *get_binop_left(const ir_node *node);
FIRM_API void     set_binop_left(ir_node *node, ir_node *left);
FIRM_API ir_node *get_binop_right(const ir_node *node);
FIRM_API void     set_binop_right(ir_node *node, ir_node *right);

/** returns the name of an ir_relation */
FIRM_API const char *get_relation_string(ir_relation relation);

/** Calculates the negated (Complement(R)) relation, i.e. "<" --> ">=" */
FIRM_API ir_relation get_negated_relation(ir_relation relation);

/** Calculates the inversed (R^-1) relation, i.e., "<" --> ">" */
FIRM_API ir_relation get_inversed_relation(ir_relation relation);

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

/** Returns true if irg in phase phase_building and the Phi has zero
   predecessors. It's a Phi0 then. */
FIRM_API int       is_Phi0(const ir_node *n);
FIRM_API ir_node **get_Phi_preds_arr(ir_node *node);
FIRM_API int       get_Phi_n_preds(const ir_node *node);
FIRM_API ir_node  *get_Phi_pred(const ir_node *node, int pos);
FIRM_API void      set_Phi_pred(ir_node *node, int pos, ir_node *pred);
/**
 * Returns the next element of a block phi list.
 */
FIRM_API ir_node  *get_Phi_next(const ir_node *phi);
/**
 * Sets the next link of a block Phi list.
 */
FIRM_API void      set_Phi_next(ir_node *phi, ir_node *next);

/** 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.
 */
FIRM_API int      is_memop(const ir_node *node);
FIRM_API ir_node *get_memop_mem(const ir_node *node);
FIRM_API void     set_memop_mem(ir_node *node, ir_node *mem);
FIRM_API ir_node *get_memop_ptr(const ir_node *node);
FIRM_API void     set_memop_ptr(ir_node *node, ir_node *ptr);

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

/** Return the projection number of a Proj node. */
FIRM_API long      get_Proj_proj(const ir_node *node);
FIRM_API void      set_Proj_proj(ir_node *node, long proj);

/**
 * Returns non-zero if a node is a routine parameter.
 *
 * @param node  the Proj node to test
 */
FIRM_API int is_arg_Proj(const ir_node *node);

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

/** Return the number of input constraints for an ASM node. */
FIRM_API int get_ASM_n_input_constraints(const ir_node *node);
/** Return the number of output constraints for an ASM node.  */
FIRM_API int get_ASM_n_output_constraints(const ir_node *node);
/** Return the number of clobbered registers for an ASM node.  */
FIRM_API int get_ASM_n_clobbers(const ir_node *node);

/*
 *
 * NAME Auxiliary routines
 *
 */

/** Returns operand of node if node is a Proj. */
FIRM_API ir_node *skip_Proj(ir_node *node);
/** Returns operand of node if node is a Proj. */
FIRM_API const ir_node *skip_Proj_const(const ir_node *node);
/** Returns operand of node if node is a Id. */
FIRM_API ir_node *skip_Id(ir_node *node);   /* Old name is skip_nop(). */
/** Returns corresponding operand of Tuple if node is a Proj from
   a Tuple. */
FIRM_API ir_node *skip_Tuple(ir_node *node);
/** Returns operand of node if node is a Cast. */
FIRM_API ir_node *skip_Cast(ir_node *node);
FIRM_API const ir_node *skip_Cast_const(const ir_node *node);
/** Returns operand of node if node is a Pin. */
FIRM_API ir_node *skip_Pin(ir_node *node);
/** Returns operand of node if node is a Confirm */
FIRM_API ir_node *skip_Confirm(ir_node *node);
/** Skip all high-level Operations (including Cast, Confirm). */
FIRM_API ir_node *skip_HighLevel_ops(ir_node *node);
/** Returns true if the operation manipulates control flow:
   Start, End, Jmp, Cond, Return, Raise, Bad */
FIRM_API int is_cfop(const ir_node *node);

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

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

/**
 * Copies attributes stored in the old node to a new node.
 * Assumes both have the same opcode and sufficient size.
 *
 * @param irg       The irg of the new_node (get_irn_irg on it might not work
 *                  yet)
 * @param old_node  the node where the attributes are copied from
 * @param new_node  node the attributes get copies to.
 *
 * This copies all essential information to the new node. It does not copy
 * temporal or calculated information like visited flags or results of dominance
 * or loop calculations
 */
FIRM_API void copy_node_attr(ir_graph *irg, const ir_node *old_node, ir_node *new_node);

/** Return the type attribute of a node n (SymConst, Call, Alloc, Free,
    Cast) or NULL.*/
FIRM_API ir_type *get_irn_type_attr(ir_node *n);

/** Return the entity attribute of a node n (SymConst, Sel) or NULL. */
FIRM_API ir_entity *get_irn_entity_attr(ir_node *n);

/** Returns non-zero for constant-like nodes. */
FIRM_API int is_irn_constlike(const ir_node *node);

/**
 * Returns non-zero for nodes that are allowed to have keep-alives and
 * are neither Block nor PhiM.
 */
FIRM_API int is_irn_keep(const ir_node *node);

/**
 * Returns non-zero for nodes that are always placed in the start block.
 */
FIRM_API int is_irn_start_block_placed(const ir_node *node);

/**
 * Returns non-zero for nodes that are machine operations.
 */
FIRM_API int is_irn_machine_op(const ir_node *node);

/**
 * Returns non-zero for nodes that are machine operands.
 */
FIRM_API int is_irn_machine_operand(const ir_node *node);

/**
 * Returns non-zero for nodes that have the n'th user machine flag set.
 */
FIRM_API int is_irn_machine_user(const ir_node *node, unsigned n);

/**
 * Returns non-zero for nodes that are CSE neutral to its users.
 */
FIRM_API int is_irn_cse_neutral(const ir_node *node);

/** Gets the string representation of the jump prediction. */
FIRM_API const char *get_cond_jmp_predicate_name(cond_jmp_predicate pred);

/** Checks whether a node represents a global address. */
FIRM_API int is_Global(const ir_node *node);

/* Returns the entity of a global address. */
FIRM_API ir_entity *get_Global_entity(const ir_node *node);

/**
 * 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.
 */
FIRM_API unsigned firm_register_additional_node_data(unsigned size);

/**
 * Return a pointer to the node attributes.
 * Needed for user-defined nodes.
 */
FIRM_API void *get_irn_generic_attr(ir_node *node);
FIRM_API const void *get_irn_generic_attr_const(const ir_node *node);

/**
 * Returns the unique node index for the node in its graph.
 * This index is used to access phase information for this node.
 */
FIRM_API unsigned get_irn_idx(const ir_node *node);

/**
 * Sets the debug information of a node.
 *
 * @param n   The node.
 * @param db  The debug info.
 */
FIRM_API void set_irn_dbg_info(ir_node *n, dbg_info *db);

/**
 * Returns the debug information of an node.
 *
 * @param n   The node.
 */
FIRM_API dbg_info *get_irn_dbg_info(const ir_node *n);

/**
 * Calculate a hash value of a node. Only inputs, mode and opcode are used.
 *
 * @param node  the node to hash
 */
FIRM_API unsigned firm_default_hash(const ir_node *node);

/**
 * returns a descriptive name of a node (containing type+number)
 */
FIRM_API const char *gdb_node_helper(void *firm_object);

/*@}*/ /* end of ir_node group definition */

#include "end.h"

#endif