Turn alloca() with fixed size into array.

[libfirm] / ir / be / bearch_t.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       Processor architecture specification - internal data structures.
 * @author      Sebastian Hack
 * @version     $Id$
 */
#ifndef FIRM_BE_BEARCH_T_H
#define FIRM_BE_BEARCH_T_H

#include "bearch.h"

#include "belistsched.h"
#include "beilpsched.h"
#include "bemachine.h"
#include "beirg.h"
#include "beabi.h"
#include "raw_bitset.h"

/**
 * A register.
 */
struct arch_register_t {
        const char                  *name;        /**< The name of the register. */
        const arch_register_class_t *reg_class;   /**< The class the register belongs to. */
        unsigned                    index;        /**< The index of the register in the class. */
        arch_register_type_t        type;         /**< The type of the register. */
};

static inline const arch_register_class_t *
_arch_register_get_class(const arch_register_t *reg)
{
        return reg->reg_class;
}

static inline
unsigned _arch_register_get_index(const arch_register_t *reg)
{
        return reg->index;
}

static inline
const char *_arch_register_get_name(const arch_register_t *reg)
{
        return reg->name;
}

#define arch_register_get_class(reg)      _arch_register_get_class(reg)
#define arch_register_get_index(reg)      _arch_register_get_index(reg)
#define arch_register_get_name(reg)       _arch_register_get_name(reg)

/**
 * Convenience macro to check for register type.
 * @param req   A pointer to register.
 * @param kind  The kind of type to check for (see arch_register_type_t).
 * @return      1, If register is of given kind, 0 if not.
 */
#define arch_register_type_is(reg, kind) \
  (((reg)->type & arch_register_type_ ## kind) != 0)

/**
 * A class of registers.
 * Like general purpose or floating point.
 */
struct arch_register_class_t {
        unsigned                     index;  /**< index of this register class */
        const char                  *name;   /**< The name of the register class.*/
        unsigned                     n_regs; /**< Number of registers in this
                                                  class. */
        ir_mode                     *mode;   /**< The mode of the register class.*/
        const arch_register_t       *regs;   /**< The array of registers. */
        arch_register_class_flags_t  flags;  /**< register class flags. */
};

/** return the number of registers in this register class */
#define arch_register_class_n_regs(cls) ((cls)->n_regs)

/** return the largest mode of this register class */
#define arch_register_class_mode(cls) ((cls)->mode)

/** return the name of this register class */
#define arch_register_class_name(cls) ((cls)->name)

/** return the index of this register class */
#define arch_register_class_index(cls)  ((cls)->index)

/** return the register class flags */
#define arch_register_class_flags(cls) ((cls)->flags)

static inline const arch_register_t *
_arch_register_for_index(const arch_register_class_t *cls, unsigned idx)
{
        assert(idx < cls->n_regs);
        return &cls->regs[idx];
}

#define arch_register_for_index(cls, idx)   _arch_register_for_index(cls, idx)

/**
 * Convenience macro to check for set constraints.
 * @param req   A pointer to register requirements.
 * @param kind  The kind of constraint to check for (see arch_register_req_type_t).
 * @return      1, If the kind of constraint is present, 0 if not.
 */
#define arch_register_req_is(req, kind) \
        (((req)->type & (arch_register_req_type_ ## kind)) != 0)

/**
 * Expresses requirements to register allocation for an operand.
 */
struct arch_register_req_t {
        arch_register_req_type_t type;      /**< The type of the constraint. */
        const arch_register_class_t *cls;   /**< The register class this constraint belongs to. */

        const unsigned *limited;            /**< allowed register bitset */

        unsigned other_same;                /**< Bitmask of ins which should use the
                                                 same register (should_be_same). */
        unsigned other_different;           /**< Bitmask of ins which shall use a
                                                 different register
                                                 (must_be_different) */
};

static inline int reg_reqs_equal(const arch_register_req_t *req1,
                                 const arch_register_req_t *req2)
{
        if (req1 == req2)
                return 1;

        if (req1->type != req2->type
                        || req1->cls != req2->cls
                        || req1->other_same != req2->other_same
                        || req1->other_different != req2->other_different)
                return 0;

        if (req1->limited != NULL) {
                size_t n_regs;

                if (req2->limited == NULL)
                        return 0;

                n_regs = arch_register_class_n_regs(req1->cls);
                if (!rbitset_equal(req1->limited, req2->limited, n_regs))
                        return 0;
        }

        return 1;
}

/**
 * An inverse operation returned by the backend
 */
struct arch_inverse_t {
        int      n;       /**< count of nodes returned in nodes array */
        int      costs;   /**< costs of this remat */

        /**< nodes for this inverse operation. shall be in
         *  schedule order. last element is the target value
         */
        ir_node  **nodes;
};

struct arch_irn_ops_t {

        /**
         * Get the register requirements for a given operand.
         * @param self The self pointer.
         * @param irn The node.
         * @param pos The operand's position
         *        (-1 for the result of the node, 0..n for the input operands).
         * @return    The register requirements for the selected operand.
         *            The pointer returned is never NULL.
         */
        const arch_register_req_t *(*get_irn_reg_req)(const ir_node *irn, int pos);

        /**
         * Set the register for an output operand.
         * @param irn The node.
         * @param reg The register allocated to that operand.
         * @note      If the operand is not a register operand,
         *            the call is ignored.
         */
        void (*set_irn_reg)(ir_node *irn, const arch_register_t *reg);

        /**
         * Get the register allocated for an output operand.
         * @param irn The node.
         * @return    The register allocated at that operand. NULL, if
         *            the operand was no register operand or
         *            @c arch_register_invalid, if no register has yet been
         *            allocated for this node.
         */
        const arch_register_t *(*get_irn_reg)(const ir_node *irn);

        /**
         * Classify the node.
         * @param irn The node.
         * @return A classification.
         */
        arch_irn_class_t (*classify)(const ir_node *irn);

        /**
         * Get the flags of a node.
         * @param self The irn ops themselves.
         * @param irn The node.
         * @return A set of flags.
         */
        arch_irn_flags_t (*get_flags)(const ir_node *irn);

        /**
         * Get the entity on the stack frame this node depends on.
         * @param self The this pointer.
         * @param irn  The node in question.
         * @return The entity on the stack frame or NULL, if the node does not have a
         *         stack frame entity.
         */
        ir_entity *(*get_frame_entity)(const ir_node *irn);

        /**
         * Set the entity on the stack frame this node depends on.
         * @param self The this pointer.
         * @param irn  The node in question.
         * @param ent  The entity to set
         */
        void (*set_frame_entity)(ir_node *irn, ir_entity *ent);

        /**
         * Set the offset of a node carrying an entity on the stack frame.
         * @param self The this pointer.
         * @param irn  The node.
         * @param offset The offset of the node's stack frame entity.
         */
        void (*set_frame_offset)(ir_node *irn, int offset);

        /**
         * Returns the delta of the stackpointer for nodes that increment or
         * decrement the stackpointer with a constant value. (push, pop
         * nodes on most architectures).
         * A positive value stands for an expanding stack area, a negative value for
         * a shrinking one.
         *
         * @param self      The this pointer
         * @param irn       The node
         * @return          0 if the stackpointer is not modified with a constant
         *                  value, otherwise the increment/decrement value
         */
        int (*get_sp_bias)(const ir_node *irn);

        /**
         * Returns an inverse operation which yields the i-th argument
         * of the given node as result.
         *
         * @param self      The this pointer.
         * @param irn       The original operation
         * @param i         Index of the argument we want the inverse operation to yield
         * @param inverse   struct to be filled with the resulting inverse op
         * @param obstack   The obstack to use for allocation of the returned nodes array
         * @return          The inverse operation or NULL if operation invertible
         */
        arch_inverse_t *(*get_inverse)(const ir_node *irn, int i, arch_inverse_t *inverse, struct obstack *obstack);

        /**
         * Get the estimated cycle count for @p irn.
         *
         * @param self The this pointer.
         * @param irn  The node.
         *
         * @return     The estimated cycle count for this operation
         */
        int (*get_op_estimated_cost)(const ir_node *irn);

        /**
         * Asks the backend whether operand @p i of @p irn can be loaded form memory internally
         *
         * @param self The this pointer.
         * @param irn  The node.
         * @param i    Index of the argument we would like to know whether @p irn can load it form memory internally
         *
         * @return     nonzero if argument can be loaded or zero otherwise
         */
        int (*possible_memory_operand)(const ir_node *irn, unsigned int i);

        /**
         * Ask the backend to assimilate @p reload of operand @p i into @p irn.
         *
         * @param self   The this pointer.
         * @param irn    The node.
         * @param spill  The spill.
         * @param i      The position of the reload.
         */
        void (*perform_memory_operand)(ir_node *irn, ir_node *spill, unsigned int i);
};

/**
 * The code generator interface.
 */
struct arch_code_generator_if_t {
        /**
         * Initialize the code generator.
         * @param birg A backend IRG session.
         * @return     A newly created code generator.
         */
        void *(*init)(be_irg_t *birg);

        /**
         * return node used as base in pic code addresses
         */
        ir_node* (*get_pic_base)(void *self);

        /**
         * Called before abi introduce.
         */
        void (*before_abi)(void *self);

        /**
         * Called, when the graph is being normalized.
         */
        void (*prepare_graph)(void *self);

        /**
         * Backend may provide an own spiller.
         * This spiller needs to spill all register classes.
         */
        void (*spill)(void *self, be_irg_t *birg);

        /**
         * Called before register allocation.
         */
        void (*before_ra)(void *self);

        /**
         * Called after register allocation.
         */
        void (*after_ra)(void *self);

        /**
         * Called directly before done is called. This should be the last place
         * where the irg is modified.
         */
        void (*finish)(void *self);

        /**
         * Called after everything happened. This call should emit the final
         * assembly code but avoid changing the irg.
         * The code generator must also be de-allocated here.
         */
        void (*done)(void *self);
};

/**
 * helper macro: call function func from the code generator
 * if it's implemented.
 */
#define _arch_cg_call(cg, func) \
do { \
        if((cg)->impl->func) \
                (cg)->impl->func(cg); \
} while(0)

#define _arch_cg_call_env(cg, env, func) \
do { \
        if((cg)->impl->func) \
                (cg)->impl->func(cg, env); \
} while(0)

#define arch_code_generator_before_abi(cg)      _arch_cg_call(cg, before_abi)
#define arch_code_generator_prepare_graph(cg)   _arch_cg_call(cg, prepare_graph)
#define arch_code_generator_before_ra(cg)       _arch_cg_call(cg, before_ra)
#define arch_code_generator_after_ra(cg)        _arch_cg_call(cg, after_ra)
#define arch_code_generator_finish(cg)          _arch_cg_call(cg, finish)
#define arch_code_generator_done(cg)            _arch_cg_call(cg, done)
#define arch_code_generator_spill(cg, birg)     _arch_cg_call_env(cg, birg, spill)
#define arch_code_generator_has_spiller(cg)     ((cg)->impl->spill != NULL)
#define arch_code_generator_get_pic_base(cg)    \
        ((cg)->impl->get_pic_base != NULL ? (cg)->impl->get_pic_base(cg) : NULL)

/**
 * Code generator base class.
 */
struct arch_code_generator_t {
        const arch_code_generator_if_t *impl;
};

/**
 * Architecture interface.
 */
struct arch_isa_if_t {
        /**
         * Initialize the isa interface.
         * @param file_handle  the file handle to write the output to
         * @param main_env     the be main environment
         * @return a new isa instance
         */
        arch_env_t *(*init)(FILE *file_handle);

        /**
         * Free the isa instance.
         */
        void (*done)(void *self);

        /**
         * Get the the number of register classes in the isa.
         * @return The number of register classes.
         */
        unsigned (*get_n_reg_class)(const void *self);

        /**
         * Get the i-th register class.
         * @param i The number of the register class.
         * @return The register class.
         */
        const arch_register_class_t *(*get_reg_class)(const void *self, unsigned i);

        /**
         * Get the register class which shall be used to store a value of a given mode.
         * @param self The this pointer.
         * @param mode The mode in question.
         * @return A register class which can hold values of the given mode.
         */
        const arch_register_class_t *(*get_reg_class_for_mode)(const void *self, const ir_mode *mode);

        /**
         * Get the ABI restrictions for procedure calls.
         * @param self        The this pointer.
         * @param call_type   The call type of the method (procedure) in question.
         * @param p           The array of parameter locations to be filled.
         */
        void (*get_call_abi)(const void *self, ir_type *call_type, be_abi_call_t *abi);

        /**
         * Get the code generator interface.
         * @param self The this pointer.
         * @return     Some code generator interface.
         */
        const arch_code_generator_if_t *(*get_code_generator_if)(void *self);

        /**
         * Get the list scheduler to use. There is already a selector given, the
         * backend is free to modify and/or ignore it.
         *
         * @param self     The isa object.
         * @param selector The selector given by options.
         * @return         The list scheduler selector.
         */
        const list_sched_selector_t *(*get_list_sched_selector)(const void *self, list_sched_selector_t *selector);

        /**
         * Get the ILP scheduler to use.
         * @param self  The isa object.
         * @return      The ILP scheduler selector
         */
        const ilp_sched_selector_t *(*get_ilp_sched_selector)(const void *self);

        /**
         * Get the necessary alignment for storing a register of given class.
         * @param self  The isa object.
         * @param cls   The register class.
         * @return      The alignment in bytes.
         */
        int (*get_reg_class_alignment)(const void *self, const arch_register_class_t *cls);

        /**
         * A "static" function, returns the frontend settings
         * needed for this backend.
         */
        const backend_params *(*get_params)(void);

        /**
         * Returns an 2-dim array of execution units, @p irn can be executed on.
         * The first dimension is the type, the second the allowed units of this
         * type.
         * Each dimension is a NULL terminated list.
         * @param self  The isa object.
         * @param irn   The node.
         * @return An array of allowed execution units.
         *         exec_unit = {
         *                       { unit1_of_tp1, ..., unitX1_of_tp1, NULL },
         *                       ...,
         *                       { unit1_of_tpY, ..., unitXn_of_tpY, NULL },
         *                       NULL
         *                     };
         */
        const be_execution_unit_t ***(*get_allowed_execution_units)(const void *self, const ir_node *irn);

        /**
         * Return the abstract machine for this isa.
         * @param self  The isa object.
         */
        const be_machine_t *(*get_machine)(const void *self);

        /**
         * Return an ordered list of irgs where code should be generated for.
         * If NULL is returned, all irg will be taken into account and they will be
         * generated in an arbitrary order.
         * @param self   The isa object.
         * @param irgs   A flexible array ARR_F of length 0 where the backend can append the desired irgs.
         * @return A flexible array ARR_F containing all desired irgs in the desired order.
         */
        ir_graph **(*get_backend_irg_list)(const void *self, ir_graph ***irgs);

        /**
         * mark node as rematerialized
         */
        void (*mark_remat)(const void *self, ir_node *node);

        /**
         * parse an assembler constraint part and set flags according to its nature
         * advances the *c pointer to point to the last parsed character (so if you
         * parse a single character don't advance c)
         */
        asm_constraint_flags_t (*parse_asm_constraint)(const void *self, const char **c);

        /**
         * returns true if the string is a valid clobbered (register) in this
         * backend
         */
        int (*is_valid_clobber)(const void *self, const char *clobber);
};

#define arch_env_done(env)                             ((env)->impl->done(env))
#define arch_env_get_n_reg_class(env)                  ((env)->impl->get_n_reg_class(env))
#define arch_env_get_reg_class(env,i)                  ((env)->impl->get_reg_class(env, i))
#define arch_env_get_reg_class_for_mode(env,mode)      ((env)->impl->get_reg_class_for_mode((env), (mode)))
#define arch_env_get_call_abi(env,tp,abi)              ((env)->impl->get_call_abi((env), (tp), (abi)))
#define arch_env_get_code_generator_if(env)            ((env)->impl->get_code_generator_if((env)))
#define arch_env_get_list_sched_selector(env,selector) ((env)->impl->get_list_sched_selector((env), (selector)))
#define arch_env_get_ilp_sched_selector(env)           ((env)->impl->get_ilp_sched_selector(env))
#define arch_env_get_reg_class_alignment(env,cls)      ((env)->impl->get_reg_class_alignment((env), (cls)))
#define arch_env_get_params(env)                       ((env)->impl->get_params())
#define arch_env_get_allowed_execution_units(env,irn)  ((env)->impl->get_allowed_execution_units((env), (irn)))
#define arch_env_get_machine(env)                      ((env)->impl->get_machine(env))
#define arch_env_get_backend_irg_list(env,irgs)        ((env)->impl->get_backend_irg_list((env), (irgs)))
#define arch_env_parse_asm_constraint(env,c)           ((env)->impl->parse_asm_constraint((env), (c))
#define arch_env_is_valid_clobber(env,clobber)         ((env)->impl->is_valid_clobber((env), (clobber))
#define arch_env_mark_remat(env,node) \
        do { if ((env)->impl->mark_remat != NULL) (env)->impl->mark_remat((env), (node)); } while(0)

/**
 * ISA base class.
 */
struct arch_env_t {
        const arch_isa_if_t   *impl;
        const arch_register_t *sp;              /** The stack pointer register. */
        const arch_register_t *bp;              /** The base pointer register. */
        int                    stack_dir;       /** -1 for decreasing, 1 for increasing. */
        int                    stack_alignment; /** power of 2 stack alignment */
        const be_main_env_t   *main_env;        /** the be main environment */
        int                    spill_cost;      /** cost for a be_Spill node */
        int                    reload_cost;     /** cost for a be_Reload node */
};

#define arch_env_stack_dir(env)  ((env)->stack_dir)
#define arch_env_sp(env)         ((env)->sp)
#define arch_env_bp(env)         ((env)->bp)

#endif /* FIRM_BE_BEARCH_T_H */