#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "target.h"
#include "tree.h"
#include "tree-iterator.h"
#include "gimple-expr.h"
#include "diagnostic.h"
#include "opts.h"
#include "fold-const.h"
#include "stor-layout.h"
#include "debug.h"
#include "langhooks.h"
#include "langhooks-def.h"
#include "common/common-target.h"

#include <fstream>
#include <elna/source/driver.h>
#include "elna/gcc/elna-tree.h"
#include "elna/gcc/elna-generic.h"
#include "elna/gcc/elna-diagnostic.h"
#include "parser.hh"

/* Language-dependent contents of a type.  */

struct GTY (()) lang_type
{
    char dummy;
};

/* Language-dependent contents of a decl.  */

struct GTY (()) lang_decl
{
    char dummy;
};

/* Language-dependent contents of an identifier.  This must include a
   tree_identifier.  */

struct GTY (()) lang_identifier
{
    struct tree_identifier common;
};

/* The resulting tree type.  */

union GTY ((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
	    chain_next ("CODE_CONTAINS_STRUCT (TREE_CODE (&%h.generic), "
			"TS_COMMON) ? ((union lang_tree_node *) TREE_CHAIN "
			"(&%h.generic)) : NULL"))) lang_tree_node
{
    union tree_node GTY ((tag ("0"), desc ("tree_node_structure (&%h)"))) generic;
    struct lang_identifier GTY ((tag ("1"))) identifier;
};

/* We don't use language_function.  */

struct GTY (()) language_function
{
    int dummy;
};

/* Language hooks.  */

static bool elna_langhook_init(void)
{
    build_common_tree_nodes(false);
    elna::gcc::init_ttree();

    void_list_node = build_tree_list(NULL_TREE, void_type_node);

    build_common_builtin_nodes();

    return true;
}

static void elna_parse_file(const char *filename)
{
    std::ifstream file{ filename, std::ios::in };

    if (!file)
    {
        fatal_error(UNKNOWN_LOCATION, "cannot open filename %s: %m", filename);
    }

    elna::source::driver driver{ filename };
    elna::source::lexer lexer(file);
    yy::parser parser(lexer, driver);

    linemap_add(line_table, LC_ENTER, 0, filename, 1);
    if (parser())
    {
        for (const auto& error : driver.errors())
        {
            auto gcc_location = elna::gcc::get_location(&error->position);

            error_at(gcc_location, error->what().c_str());
        }
    }
    else
    {
        elna::gcc::generic_visitor generic_visitor;

        generic_visitor.visit(driver.tree.get());
    }
    linemap_add(line_table, LC_LEAVE, 0, NULL, 0);
}

static void elna_langhook_parse_file(void)
{
    for (unsigned int i = 0; i < num_in_fnames; i++)
    {
        elna_parse_file(in_fnames[i]);
    }
}

static tree elna_langhook_type_for_mode(enum machine_mode mode, int unsignedp)
{
    if (mode == TYPE_MODE(float_type_node))
    {
        return float_type_node;
    }
    else if (mode == TYPE_MODE(double_type_node))
    {
        return double_type_node;
    }
    if (mode == TYPE_MODE(intQI_type_node))
    {
        return unsignedp ? unsigned_intQI_type_node : intQI_type_node;
    }
    else if (mode == TYPE_MODE(intHI_type_node))
    {
        return unsignedp ? unsigned_intHI_type_node : intHI_type_node;
    }
    else if (mode == TYPE_MODE(intSI_type_node))
    {
        return unsignedp ? unsigned_intSI_type_node : intSI_type_node;
    }
    else if (mode == TYPE_MODE(intDI_type_node))
    {
        return unsignedp ? unsigned_intDI_type_node : intDI_type_node;
    }
    else if (mode == TYPE_MODE(intTI_type_node))
    {
        return unsignedp ? unsigned_intTI_type_node : intTI_type_node;
    }
    else if (mode == TYPE_MODE(integer_type_node))
    {
        return unsignedp ? unsigned_type_node : integer_type_node;
    }
    else if (mode == TYPE_MODE(long_integer_type_node))
    {
        return unsignedp ? long_unsigned_type_node : long_integer_type_node;
    }
    else if (mode == TYPE_MODE(long_long_integer_type_node))
    {
        return unsignedp
            ? long_long_unsigned_type_node
            : long_long_integer_type_node;
    }
    if (COMPLEX_MODE_P(mode))
    {
        if (mode == TYPE_MODE(complex_float_type_node))
        {
            return complex_float_type_node;
        }
        if (mode == TYPE_MODE(complex_double_type_node))
        {
            return complex_double_type_node;
        }
        if (mode == TYPE_MODE(complex_long_double_type_node))
        {
            return complex_long_double_type_node;
        }
        if (mode == TYPE_MODE(complex_integer_type_node) && !unsignedp)
        {
            return complex_integer_type_node;
        }
    }
    /* gcc_unreachable */
    return nullptr;
}

static tree elna_langhook_type_for_size(unsigned int bits ATTRIBUTE_UNUSED,
    int unsignedp ATTRIBUTE_UNUSED)
{
    gcc_unreachable();
}

/* Record a builtin function.  We just ignore builtin functions.  */

static tree elna_langhook_builtin_function(tree decl)
{
    return decl;
}

static bool elna_langhook_global_bindings_p(void)
{
    gcc_unreachable();
}

static tree elna_langhook_pushdecl(tree decl ATTRIBUTE_UNUSED)
{
    gcc_unreachable();
}

static tree elna_langhook_getdecls(void)
{
    return NULL;
}

#undef LANG_HOOKS_NAME
#define LANG_HOOKS_NAME "Elna"

#undef LANG_HOOKS_INIT
#define LANG_HOOKS_INIT elna_langhook_init

#undef LANG_HOOKS_PARSE_FILE
#define LANG_HOOKS_PARSE_FILE elna_langhook_parse_file

#undef LANG_HOOKS_TYPE_FOR_MODE
#define LANG_HOOKS_TYPE_FOR_MODE elna_langhook_type_for_mode

#undef LANG_HOOKS_TYPE_FOR_SIZE
#define LANG_HOOKS_TYPE_FOR_SIZE elna_langhook_type_for_size

#undef LANG_HOOKS_BUILTIN_FUNCTION
#define LANG_HOOKS_BUILTIN_FUNCTION elna_langhook_builtin_function

#undef LANG_HOOKS_GLOBAL_BINDINGS_P
#define LANG_HOOKS_GLOBAL_BINDINGS_P elna_langhook_global_bindings_p

#undef LANG_HOOKS_PUSHDECL
#define LANG_HOOKS_PUSHDECL elna_langhook_pushdecl

#undef LANG_HOOKS_GETDECLS
#define LANG_HOOKS_GETDECLS elna_langhook_getdecls

struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER;

#include "gt-elna-elna1.h"
#include "gtype-elna.h"