source: mainline/uspace/app/sbi/src/run_texpr.c@ 81b1db8

/*
 * Copyright (c) 2010 Jiri Svoboda
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @file Evaluate type expressions. */

#include <assert.h>
#include <stdlib.h>
#include "cspan.h"
#include "debug.h"
#include "list.h"
#include "mytypes.h"
#include "stree.h"
#include "strtab.h"
#include "symbol.h"
#include "tdata.h"

#include "run_texpr.h"

static void run_taccess(stree_program_t *prog, stree_csi_t *ctx,
    stree_taccess_t *taccess, tdata_item_t **res);
static void run_tindex(stree_program_t *prog, stree_csi_t *ctx,
    stree_tindex_t *tindex, tdata_item_t **res);
static void run_tliteral(stree_program_t *prog, stree_csi_t *ctx,
    stree_tliteral_t *tliteral, tdata_item_t **res);
static void run_tnameref(stree_program_t *prog, stree_csi_t *ctx,
    stree_tnameref_t *tnameref, tdata_item_t **res);
static void run_tapply(stree_program_t *prog, stree_csi_t *ctx,
    stree_tapply_t *tapply, tdata_item_t **res);

/** Evaluate type expression.
 *
 * Evaluate type expression (this produces a type item). If a type error
 * occurs, the resulting type item is of class @c tic_ignore.
 *
 * @param prog          Program
 * @param ctx           Current CSI (context)
 * @param texpr         Type expression to evaluate
 * @param res           Place to store type result
 */
void run_texpr(stree_program_t *prog, stree_csi_t *ctx, stree_texpr_t *texpr,
    tdata_item_t **res)
{
        switch (texpr->tc) {
        case tc_taccess:
                run_taccess(prog, ctx, texpr->u.taccess, res);
                break;
        case tc_tindex:
                run_tindex(prog, ctx, texpr->u.tindex, res);
                break;
        case tc_tliteral:
                run_tliteral(prog, ctx, texpr->u.tliteral, res);
                break;
        case tc_tnameref:
                run_tnameref(prog, ctx, texpr->u.tnameref, res);
                break;
        case tc_tapply:
                run_tapply(prog, ctx, texpr->u.tapply, res);
                break;
        }
}

/** Evaluate type access expression.
 *
 * Evaluate operation per the type access ('.') operator.
 *
 * @param prog          Program
 * @param ctx           Current CSI (context)
 * @param taccess       Type access expression to evaluate
 * @param res           Place to store type result
 */
static void run_taccess(stree_program_t *prog, stree_csi_t *ctx,
    stree_taccess_t *taccess, tdata_item_t **res)
{
        stree_symbol_t *sym;
        tdata_item_t *targ_i = NULL;
        tdata_item_t *titem = NULL;
        tdata_object_t *tobject;
        tdata_deleg_t *tdeleg;
        stree_csi_t *base_csi;
        stree_deleg_t *deleg;
        stree_enum_t *enum_d;
        tdata_enum_t *tenum;

#ifdef DEBUG_RUN_TRACE
        printf("Evaluating type access operation.\n");
#endif
        /* Evaluate base type. */
        run_texpr(prog, ctx, taccess->arg, &targ_i);

        if (targ_i->tic == tic_ignore) {
                *res = tdata_item_new(tic_ignore);
                return;
        }

        if (targ_i->tic != tic_tobject) {
                cspan_print(taccess->texpr->cspan);
                printf(" Error: Using '.' with type which is not an "
                    "object.\n");
                *res = tdata_item_new(tic_ignore);
                return;
        }

        /* Get base CSI. */
        base_csi = targ_i->u.tobject->csi;

        sym = symbol_lookup_in_csi(prog, base_csi, taccess->member_name);
        if (sym == NULL) {
                cspan_print(taccess->member_name->cspan);
                printf(" Error: CSI '");
                symbol_print_fqn(csi_to_symbol(base_csi));
                printf("' has no member named '%s'.\n",
                    strtab_get_str(taccess->member_name->sid));
                *res = tdata_item_new(tic_ignore);
                return;
        }

        switch (sym->sc) {
        case sc_csi:
                /* Construct type item. */
                titem = tdata_item_new(tic_tobject);
                tobject = tdata_object_new();
                titem->u.tobject = tobject;

                tobject->static_ref = sn_nonstatic;
                tobject->csi = sym->u.csi;
                list_init(&tobject->targs);
                break;
        case sc_ctor:
                /* It is not possible to reference a constructor explicitly. */
                assert(b_false);
                /* Fallthrough */
        case sc_deleg:
                /* Fetch stored delegate type. */
                deleg = symbol_to_deleg(sym);
                assert(deleg != NULL);
                if (deleg->titem == NULL) {
                        /*
                         * Prepare a partial delegate which will be completed
                         * later.
                         */
                        titem = tdata_item_new(tic_tdeleg);
                        tdeleg = tdata_deleg_new();
                        titem->u.tdeleg = tdeleg;
                        tdeleg->deleg = deleg;
                        tdeleg->tsig = NULL;

                        deleg->titem = titem;
                } else {
                        titem = deleg->titem;
                }
                break;
        case sc_enum:
                /* Fetch stored enum type. */
                enum_d = symbol_to_enum(sym);
                assert(enum_d != NULL);
                if (enum_d->titem == NULL) {
                        /*
                         * Prepare a partial enum whic will be completed
                         * later.
                         */
                        titem = tdata_item_new(tic_tenum);
                        tenum = tdata_enum_new();
                        titem->u.tenum = tenum;
                        tenum->enum_d = enum_d;
                } else {
                        titem = enum_d->titem;
                }
                break;
        case sc_fun:
        case sc_var:
        case sc_prop:
                cspan_print(taccess->member_name->cspan);
                printf(" Error: Symbol '");
                symbol_print_fqn(sym);
                printf("' is not a type.\n");
                titem = tdata_item_new(tic_ignore);
                break;
        }

        *res = titem;
}

/** Evaluate type indexing expression.
 *
 * Evaluate operation per the type indexing ('[', ']') operator.
 * A type indexing operation may have extents specified or only rank
 * specified.
 *
 * @param prog          Program
 * @param ctx           Current CSI (context)
 * @param tindex        Type indexing expression to evaluate
 * @param res           Place to store type result
 */
static void run_tindex(stree_program_t *prog, stree_csi_t *ctx,
    stree_tindex_t *tindex, tdata_item_t **res)
{
        tdata_item_t *base_ti = NULL;
        tdata_item_t *titem;
        tdata_array_t *tarray;
        stree_expr_t *arg_expr;
        list_node_t *arg_node;

#ifdef DEBUG_RUN_TRACE
        printf("Evaluating type index operation.\n");
#endif
        /* Evaluate base type. */
        run_texpr(prog, ctx, tindex->base_type, &base_ti);

        if (base_ti->tic == tic_ignore) {
                *res = tdata_item_new(tic_ignore);
                return;
        }

        /* Construct type item. */
        titem = tdata_item_new(tic_tarray);
        tarray = tdata_array_new();
        titem->u.tarray = tarray;

        tarray->base_ti = base_ti;
        tarray->rank = tindex->n_args;

        /* Copy extents. */
        list_init(&tarray->extents);
        arg_node = list_first(&tindex->args);

        while (arg_node != NULL) {
                arg_expr = list_node_data(arg_node, stree_expr_t *);
                list_append(&tarray->extents, arg_expr);
                arg_node = list_next(&tindex->args, arg_node);
        }

        *res = titem;
}

/** Evaluate type literal expression.
 *
 * @param prog          Program
 * @param ctx           Current CSI (context)
 * @param tliteral      Type literal
 * @param res           Place to store type result
 */
static void run_tliteral(stree_program_t *prog, stree_csi_t *ctx,
    stree_tliteral_t *tliteral, tdata_item_t **res)
{
        tdata_item_t *titem;
        tdata_primitive_t *tprimitive;
        tprimitive_class_t tpc;

#ifdef DEBUG_RUN_TRACE
        printf("Evaluating type literal.\n");
#endif
        (void) prog;
        (void) ctx;
        (void) tliteral;

        /* Make compiler happy. */
        tpc = 0;

        switch (tliteral->tlc) {
        case tlc_bool: tpc = tpc_bool; break;
        case tlc_char: tpc = tpc_char; break;
        case tlc_int: tpc = tpc_int; break;
        case tlc_string: tpc = tpc_string; break;
        case tlc_resource: tpc = tpc_resource; break;
        }

        /* Construct type item. */
        titem = tdata_item_new(tic_tprimitive);
        tprimitive = tdata_primitive_new(tpc);
        titem->u.tprimitive = tprimitive;

        *res = titem;
}

static void run_tnameref(stree_program_t *prog, stree_csi_t *ctx,
    stree_tnameref_t *tnameref, tdata_item_t **res)
{
        stree_symbol_t *sym;
        tdata_item_t *titem;
        tdata_object_t *tobject;
        stree_targ_t *targ;
        tdata_vref_t *tvref;
        stree_deleg_t *deleg;
        tdata_deleg_t *tdeleg;
        stree_enum_t *enum_d;
        tdata_enum_t *tenum;

#ifdef DEBUG_RUN_TRACE
        printf("Evaluating type name reference.\n");
        printf("'%s'\n", strtab_get_str(tnameref->name->sid));
#endif
        /* In interactive mode we are not in a class */
        if (ctx != NULL) {
                /* Look for type argument */
                targ = stree_csi_find_targ(ctx, tnameref->name);

                if (targ != NULL) {
                        /* Found type argument */
#ifdef DEBUG_RUN_TRACE
                        printf("Found type argument '%s'.\n",
                            strtab_get_str(tnameref->name->sid));
#endif
                        titem = tdata_item_new(tic_tvref);
                        tvref = tdata_vref_new();
                        titem->u.tvref = tvref;
                        tvref->targ = targ;

                        *res = titem;
                        return;
                }
        }

        /* Look for symbol */
        sym = symbol_lookup_in_csi(prog, ctx, tnameref->name);
        if (sym == NULL) {
                cspan_print(tnameref->texpr->cspan);
                printf(" Error: Symbol '%s' not found.\n",
                    strtab_get_str(tnameref->name->sid));
                *res = tdata_item_new(tic_ignore);
                return;
        }

        /* Make compiler happy. */
        titem = NULL;

        switch (sym->sc) {
        case sc_csi:
                /* Construct type item. */
                titem = tdata_item_new(tic_tobject);
                tobject = tdata_object_new();
                titem->u.tobject = tobject;

                tobject->static_ref = sn_nonstatic;
                tobject->csi = sym->u.csi;
                list_init(&tobject->targs);
                break;
        case sc_ctor:
                /* It is not possible to reference a constructor explicitly. */
                assert(b_false);
                /* Fallthrough */
        case sc_deleg:
                /* Fetch stored delegate type. */
                deleg = symbol_to_deleg(sym);
                assert(deleg != NULL);
                if (deleg->titem == NULL) {
                        /*
                         * Prepare a partial delegate which will be completed
                         * later.
                         */
                        titem = tdata_item_new(tic_tdeleg);
                        tdeleg = tdata_deleg_new();
                        titem->u.tdeleg = tdeleg;
                        tdeleg->deleg = deleg;
                        tdeleg->tsig = NULL;

                        deleg->titem = titem;
                } else {
                        titem = deleg->titem;
                }
                break;
        case sc_enum:
                /* Fetch stored enum type. */
                enum_d = symbol_to_enum(sym);
                assert(enum_d != NULL);
                if (enum_d->titem == NULL) {
                        /*
                         * Prepare a partial enum whic will be completed
                         * later.
                         */
                        titem = tdata_item_new(tic_tenum);
                        tenum = tdata_enum_new();
                        titem->u.tenum = tenum;
                        tenum->enum_d = enum_d;
                } else {
                        titem = enum_d->titem;
                }
                break;
        case sc_fun:
        case sc_var:
        case sc_prop:
                cspan_print(tnameref->texpr->cspan);
                printf(" Error: Symbol '");
                symbol_print_fqn(sym);
                printf("' is not a type.\n");
                titem = tdata_item_new(tic_ignore);
                break;
        }

        *res = titem;
}

/** Evaluate type application expression.
 *
 * In a type application expression type arguments are applied to a generic
 * CSI.
 *
 * @param prog          Program
 * @param ctx           Current CSI (context)
 * @param tapply        Type application expression
 * @param res           Place to store type result
 */
static void run_tapply(stree_program_t *prog, stree_csi_t *ctx,
    stree_tapply_t *tapply, tdata_item_t **res)
{
        tdata_item_t *base_ti;
        tdata_item_t *arg_ti;
        tdata_item_t *titem;
        tdata_object_t *tobject;

        list_node_t *arg_n;
        stree_texpr_t *arg;

        list_node_t *farg_n;

#ifdef DEBUG_RUN_TRACE
        printf("Evaluating type apply operation.\n");
#endif
        /* Construct type item. */
        titem = tdata_item_new(tic_tobject);
        tobject = tdata_object_new();
        titem->u.tobject = tobject;

        /* Evaluate base (generic) type. */
        run_texpr(prog, ctx, tapply->gtype, &base_ti);

        if (base_ti->tic != tic_tobject) {
                cspan_print(tapply->gtype->cspan);
                printf(" Error: Base type of generic application is not "
                    "a CSI.\n");
                *res = tdata_item_new(tic_ignore);
                return;
        }

        tobject->static_ref = sn_nonstatic;
        tobject->csi = base_ti->u.tobject->csi;
        list_init(&tobject->targs);

        /* Evaluate type arguments. */
        farg_n = list_first(&tobject->csi->targ);
        arg_n = list_first(&tapply->targs);
        while (farg_n != NULL && arg_n != NULL) {
                arg = list_node_data(arg_n, stree_texpr_t *);

                run_texpr(prog, ctx, arg, &arg_ti);

                if (arg_ti->tic == tic_ignore) {
                        *res = tdata_item_new(tic_ignore);
                        return;
                }

                list_append(&tobject->targs, arg_ti);

                farg_n = list_next(&tobject->csi->targ, farg_n);
                arg_n = list_next(&tapply->targs, arg_n);
        }

        if (farg_n != NULL || arg_n != NULL) {
                cspan_print(tapply->texpr->cspan);
                printf(" Error: Incorrect number of type arguments.\n");
                *res = tdata_item_new(tic_ignore);
                return;
        }

        *res = titem;
}