ctrump/ast/env.c

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/* -*- coding:utf-8 -*- 
 Copyright (c) 2009, Fixstars Corporation
 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.
 
   * Neither the name of Fixstars Corporation nor the names of its contributors
     may be used to endorse or promote products derived from this software
     without specific prior written permission.
 
 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER OR CONTRIBUTORS 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.
*/

#include "ctrump/ast/env.h"
#include "ctrump/common/varray.h"
#include <stdlib.h>

static struct ctrump_texpr *
handle_type_spec(struct ctrump_typespec *spec)
{
    struct ctrump_texpr *t;

    switch (spec->code) {
    case CTRUMP_TYPESPEC_BUILTIN:
        t = spec->u.builtin.texpr;
        break;

    case CTRUMP_TYPESPEC_UNTYPED_SIGNED_INT:
        t = &ctrump_builtin_sint_type;
        break;

    case CTRUMP_TYPESPEC_TYPEDEF_NAME:
        t = spec->u.typedef_name.texpr;
        break;

    case CTRUMP_TYPESPEC_STRUCT_NAME:
    case CTRUMP_TYPESPEC_UNION_NAME:
        t = spec->u.struct_name.texpr;
        break;

    case CTRUMP_TYPESPEC_ANON_STRUCT_DEFINITION:
    case CTRUMP_TYPESPEC_ANON_UNION_DEFINITION:
        t = spec->u.anon_struct_definition.def.record_type;
        break;

    case CTRUMP_TYPESPEC_STRUCT_DEFINITION:
    case CTRUMP_TYPESPEC_UNION_DEFINITION:
        t = spec->u.struct_definition.def.record_type;
        break;


    default:
        abort();
    }

    return t;
}

static void
ctrump_env_handle_decl(const struct ctrump_symbol **ret_name,
                       struct ctrump_texpr **ret_type,
                       struct ctrump_type_env *type_env,
                       const struct ctrump_declarator *decl,
                       struct ctrump_decl_specifier *declspec);


static void
ctrump_env_handle_decl_node(const struct ctrump_symbol **ret_name,
                            struct ctrump_texpr **ret_type,
                            struct ctrump_type_env *type_env,
                            const struct ctrump_declarator_node *cur_node,
                            struct ctrump_decl_specifier *declspec)
{
    struct ctrump_texpr *cur_t, *t;
    const struct ctrump_symbol *var_name = NULL;
    struct ctrump_texpr *spec_t;
    int size_val;
    int is_const;

    spec_t = handle_type_spec(&declspec->type_spec);
    spec_t = ctrump_get_qualified_type(type_env, spec_t, declspec->qual_flags);
    cur_t = ctrump_get_qualified_type(type_env, spec_t, declspec->qual_flags);

    /* analyze declarator */
    while (1) {
        switch (cur_node->code) {
        case CTRUMP_DECLARATOR_IDENTIFIER:
            var_name = cur_node->u.identifier.identifier;
            goto next;

        case CTRUMP_DECLARATOR_POINTER:
            t = ctrump_get_pointer_type(type_env, cur_t);
            cur_t = ctrump_get_qualified_attr_type(type_env, t, cur_node->u.pointer.qual_flags, &cur_node->u.pointer.attr);
            cur_node = cur_node->u.pointer.decl;
            break;

        case CTRUMP_DECLARATOR_ARRAY:
            size_val = ctrump_ast_fold_const_sint(&cur_node->u.array.size, &is_const);
            if (!is_const) {
                /* todo varray */
                abort();
            }
            cur_t = ctrump_get_array_type(type_env, cur_t, size_val);
            cur_node = cur_node->u.array.decl;
            break;

        case CTRUMP_DECLARATOR_PARAM_TYPELIST: {
            struct ctrump_texpr *ret_type = cur_t;
            struct ctrump_get_functype_iterator iter;
            int num_args = cur_node->u.param_typelist.num_args;
            int i;
            struct ctrump_texpr *arg_type, *fun_type;
            const struct ctrump_symbol *arg_name;
            struct ctrump_declarator_param *args = cur_node->u.param_typelist.args;

            ctrump_get_functype_begin(&iter, type_env, ret_type, num_args);
            for (i=0; i<num_args; i++) {
                struct ctrump_decl_specifier *spec = &args[i].decl_spec;
                struct ctrump_declarator *decl = args[i].decl;

                ctrump_env_handle_decl(&arg_name, &arg_type,
                                       type_env, decl, spec);
                ctrump_get_functype_next(type_env, &iter, arg_type);
            }

            fun_type = ctrump_get_functype_end(type_env, &iter, cur_node->u.param_typelist.has_unspecified_arg);
            cur_t = fun_type;
            cur_node = cur_node->u.param_typelist.decl;
        }
            break;

        case CTRUMP_DECLARATOR_PAREN:
            cur_node = cur_node->u.paren.decl;
            break;

        case CTRUMP_DECLARATOR_EMPTY:
        case CTRUMP_DECLARATOR_VARLEN_ARRAY: /* int a[n] */
        case CTRUMP_DECLARATOR_INCOMPLETE_ARRAY: /* int a[] */
        case CTRUMP_DECLARATOR_PARAM_IDENTIFIER_LIST: /* int func(a,b); */
            /* fixme */
            abort();
        }
    }

next:
    *ret_name = var_name;
    *ret_type = cur_t;
}

static void
ctrump_env_handle_decl(const struct ctrump_symbol **ret_name,
                       struct ctrump_texpr **ret_type,
                       struct ctrump_type_env *type_env,
                       const struct ctrump_declarator *decl,
                       struct ctrump_decl_specifier *declspec)
{
    struct ctrump_texpr *decl_type;
    ctrump_env_handle_decl_node(ret_name, &decl_type, type_env, &decl->nodes, declspec);
    *ret_type = ctrump_get_qualified_attr_type(type_env, decl_type, 0, &decl->attr);
}

void
ctrump_env_handle_record_decls(struct ctrump_record_type *record_type,
                               struct ctrump_type_env *type_env,
                               struct ctrump_struct_decl *decls,
                               int num_decl,
                               int num_field,
                               struct ctrump_gccext_attribute *attr,
                               struct ctrump_location *loc,
                               struct ctrump_mempool *tree_pool)
{
    int decl_idx, field_idx=0;
    struct ctrump_record_type_field *fields;

    fields = ctrump_mempool_alloc(tree_pool, sizeof(*fields)*num_field);
    for (decl_idx=0; decl_idx<num_decl; decl_idx++) {
        int j;
        struct ctrump_struct_decl *decl = &decls[decl_idx];
        if (decl->code == CTRUMP_STRUCT_DECL_FIELDS) {
            struct ctrump_decl_specifier *declspec = &decl->u.decl.spec;
            struct ctrump_struct_declarator *declarators = decl->u.decl.decls;
            int num_declarator = decl->u.decl.num_decls;
            for (j=0; j<num_declarator; j++) {
                const struct ctrump_symbol *name;
                struct ctrump_texpr *texpr;

                ctrump_env_handle_decl(&name, &texpr,
                                       type_env, declarators[j].decl, declspec);

                fields[field_idx].name = name;
                fields[field_idx].type = texpr;
                fields[field_idx].bitfield_width = CTRUMP_BITFIELD_UNSPECIFIED;
                fields[field_idx].attr.flags = 0;
                fields[field_idx].attr.aligned = CTRUMP_ALIGN_UNSPECIFIED;

                field_idx++;
            }
        }
    }

    ctrump_complete_struct_type(record_type, num_field, fields, attr);
}

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