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/*

 * Copyright (c) 2002-2006 The TenDRA Project <http://www.tendra.org/>.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 *

 * 1. Redistributions of source code must retain the above copyright notice,

 *    this list of conditions and the following disclaimer.

 * 2. 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.

 * 3. Neither the name of The TenDRA Project 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 HOLDERS 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.

 *

 * $Id$

 */

/*

    		 Crown Copyright (c) 1997

    This TenDRA(r) Computer Program is subject to Copyright

    owned by the United Kingdom Secretary of State for Defence

    acting through the Defence Evaluation and Research Agency

    (DERA).  It is made available to Recipients with a

    royalty-free licence for its use, reproduction, transfer

    to other parties and amendment for any purpose not excluding

    product development provided that any such use et cetera

    shall be deemed to be acceptance of the following conditions:-

        (1) Its Recipients shall ensure that this Notice is

        reproduced upon any copies or amended versions of it;

        (2) Any amended version of it shall be clearly marked to

        show both the nature of and the organisation responsible

        for the relevant amendment or amendments;

        (3) Its onward transfer from a recipient to another

        party shall be deemed to be that party's acceptance of

        these conditions;

        (4) DERA gives no warranty or assurance as to its

        quality or suitability for any purpose and DERA accepts

        no liability whatsoever in relation to any use to which

        it may be put.

*/

#include "config.h"

#include "c_types.h"

#include "ctype_ops.h"

#include "exp_ops.h"

#include "id_ops.h"

#include "nspace_ops.h"

#include "tok_ops.h"

#include "type_ops.h"

#include "error.h"

#include "catalog.h"

#include "access.h"

#include "basetype.h"

#include "class.h"

#include "declare.h"

#include "file.h"

#include "function.h"

#include "initialise.h"

#include "macro.h"

#include "namespace.h"

#include "parse.h"

#include "predict.h"

#include "rewrite.h"

#include "statement.h"

#include "syntax.h"

/*

    COUNT OF NUMBER OF SKIPPED FUNCTIONS

    This value is used to keep track of the number of functions skipped

    and subsequently compiled.

*/

static int functions_pending = 0;

/*

    SKIP A FUNCTION DEFINITION

    This routine skips the function definition for the function id given by

    the current sequence of lexical tokens.  Note that last_lex_token is

    set to lex_func_Hop to indicate that a function definition has been

    skipped.

*/

void

skip_function(IDENTIFIER id)

{

	EXP e;

	LOCATION loc;

	int t = crt_lex_token;

	PPTOKEN *p = crt_token;

	PPTOKEN *q = p;

	int brackets = 0;

	int try_block = 0;

	/* Check for previous definition */

	if (!IS_NULL_id(id)) {

		PTR(LOCATION)ploc = id_loc(id);

		COPY_loc(ploc, decl_loc);

		e = DEREF_exp(id_function_etc_defn(id));

		if (!IS_NULL_exp(e)) {

			/* Function already defined */

			report(crt_loc, ERR_basic_odr_def_func(id, ploc));

		}

	}

	/* Skip definition */

	loc = crt_loc;

	if (t == lex_try) {

		try_block = 1;

	}

	for (;;) {

		if (t == lex_open_Hbrace_H1 || t == lex_open_Hbrace_H2) {

			/* Start of block */

			brackets++;

		} else if (t == lex_close_Hbrace_H1 ||

			   t == lex_close_Hbrace_H2) {

			/* End of block */

			brackets--;

			if (brackets <= 0) {

				q = crt_token;

				t = expand_preproc(EXPAND_AHEAD);

				if (t != lex_catch || !try_block) {

					/* End of function */

					break;

				}

			}

		} else if (t == lex_semicolon && brackets == 0) {

			/* Premature end of function */

			break;

		} else if (t == lex_eof) {

			/* Premature end of file */

			report(loc, ERR_class_mfct_eof(id));

			crt_lex_token = t;

			return;

		}

		q = crt_token;

		t = expand_preproc(EXPAND_AHEAD);

	}

	last_lex_token = lex_func_Hop;

	crt_lex_token = t;

	snip_tokens(p, q);

	/* Create the definition */

	MAKE_exp_uncompiled(type_void, loc, p, e);

	if (!IS_NULL_id(id)) {

		COPY_exp(id_function_etc_defn(id), e);

		functions_pending++;

	}

	return;

}

/*

    SKIP A DEFAULT ARGUMENT VALUE

    This routine skips the default argument value for the function parameter

    id given by the current sequence of lexical tokens.  It returns an

    expression giving the skipped value which is associated with id by

    init_param.

*/

EXP

skip_default_arg(IDENTIFIER id)

{

	EXP e;

	LOCATION loc;

	int brackets = 0;

	int t = crt_lex_token;

	PPTOKEN *p = crt_token;

	PPTOKEN *q = p;

	/* Skip definition */

	loc = crt_loc;

	for (;;) {

		if (t == lex_open_Hround || t == lex_open_Htemplate) {

			brackets++;

		} else if (t == lex_close_Hround || t == lex_close_Htemplate) {

			if (brackets == 0) {

				break;

			}

			brackets--;

		} else if (t == lex_comma) {

			if (brackets == 0) {

				break;

			}

		} else if (t == lex_eof) {

			/* Premature end of file */

			report(loc, ERR_class_mfct_eof(id));

			crt_lex_token = t;

			return (NULL_exp);

		}

		q = crt_token;

		t = expand_preproc(EXPAND_AHEAD);

	}

	crt_lex_token = t;

	snip_tokens(p, q);

	/* Create the definition */

	MAKE_exp_uncompiled(type_error, loc, p, e);

	functions_pending++;

	return (e);

}

/*

    BRING A SET OF TEMPLATE ARGUMENTS INTO SCOPE

    When rescanning a template member function it is necessary to bring

    the template parameters back into scope.  This routine performs this

    operation for the template type t.  It returns the non-template

    component of t.

*/

TYPE

begin_templ_scope(TYPE t)

{

	if (!IS_NULL_type(t) && IS_type_templ(t)) {

		TYPE s = DEREF_type(type_templ_defn(t));

		TOKEN sort = DEREF_tok(type_templ_sort(t));

		NAMESPACE ns = DEREF_nspace(tok_templ_pars(sort));

		if (!IS_NULL_nspace(ns)) {

			record_location++;

			in_template_decl++;

			add_namespace(ns);

		}

		t = begin_templ_scope(s);

	}

	return (t);

}

/*

    TAKE A SET OF TEMPLATE ARGUMENTS OUT OF SCOPE

    This routine removes any template parameters brought into scope by

    begin_templ_scope.

*/

void

end_templ_scope(TYPE t)

{

	if (!IS_NULL_type(t) && IS_type_templ(t)) {

		TYPE s = DEREF_type(type_templ_defn(t));

		TOKEN sort = DEREF_tok(type_templ_sort(t));

		NAMESPACE ns = DEREF_nspace(tok_templ_pars(sort));

		end_templ_scope(s);

		if (!IS_NULL_nspace(ns)) {

			remove_namespace();

			in_template_decl--;

			record_location--;

		}

	}

	return;

}

/*

    COMPILE A FUNCTION DEFINITION

    This routine compiles any previously skipped definition for the

    function id.

*/

static void

rescan_function(IDENTIFIER id)

{

	EXP e = DEREF_exp(id_function_etc_defn(id));

	if (!IS_NULL_exp(e) && IS_exp_uncompiled(e)) {

		PPTOKEN *p;

		PARSE_STATE s;

		TYPE fn = DEREF_type(id_function_etc_type(id));

		/* Mark function as inline */

		DECL_SPEC ds = DEREF_dspec(id_storage(id));

		ds |= dspec_inline;

		COPY_dspec(id_storage(id), ds);

		/* Save current compiler state */

		save_state(&s, 1);

		/* Set parser to stored definition */

		DEREF_loc(exp_uncompiled_start(e), crt_loc);

		crt_line_changed = 1;

		crt_file_changed = 1;

		p = DEREF_pptok(exp_uncompiled_defn(e));

		init_parser(p);

		/* Start function definition */

		in_class_defn = 0;

		in_function_defn++;

		really_in_function_defn++;

		COPY_exp(id_function_etc_defn(id), NULL_exp);

		DEREF_loc(id_loc(id), decl_loc);

		IGNORE begin_templ_scope(fn);

		begin_function(id);

		/* Parse the stored function definition */

		ADVANCE_LEXER;

		parse_func(&e);

		if (crt_lex_token != lex_eof && !have_syntax_error) {

			ERROR err = ERR_lex_parse(crt_token);

			report(crt_loc, err);

			unreached_code = 1;

		}

		/* End the function definition */

		IGNORE end_function(id, e);

		end_templ_scope(fn);

		/* Reset the parser */

		restore_state(&s);

		p = restore_parser();

		free_tok_list(p);

		functions_pending--;

	}

	return;

}

/*

    COMPILE A DEFAULT ARGUMENT VALUE

    This routine compiles any previously skipped default argument value

    for the parameter id.

*/

void

rescan_param(IDENTIFIER id, int rescan)

{

	EXP e = DEREF_exp(id_parameter_init(id));

	if (!IS_NULL_exp(e) && IS_exp_uncompiled(e)) {

		PPTOKEN *p;

		PARSE_STATE s;

		TYPE fn = NULL_type;

		NAMESPACE ns = DEREF_nspace(id_parent(id));

		IDENTIFIER pid = DEREF_id(nspace_name(ns));

		if (!IS_NULL_id(pid) && IS_id_function_etc(pid)) {

			fn = DEREF_type(id_function_etc_type(pid));

		} else {

			CLASS_TYPE ct = crt_class;

			if (!IS_NULL_ctype(ct)) {

				pid = DEREF_id(ctype_name(ct));

			} else {

				pid = NULL_id;

			}

		}

		/* Save current compiler state */

		save_state(&s, 1);

		/* Set parser to stored definition */

		DEREF_loc(exp_uncompiled_start(e), crt_loc);

		crt_line_changed = 1;

		crt_file_changed = 1;

		p = DEREF_pptok(exp_uncompiled_defn(e));

		init_parser(p);

		/* Start dafault argument value */

		in_class_defn = 0;

		COPY_exp(id_parameter_init(id), NULL_exp);

		if (rescan) {

			IGNORE begin_templ_scope(fn);

			push_namespace(ns);

		}

		/* Parse the stored expression */

		ADVANCE_LEXER;

		in_default_arg++;

		parse_exp(&e);

		in_default_arg--;

		if (crt_lex_token != lex_eof && !have_syntax_error) {

			ERROR err = ERR_lex_parse(crt_token);

			report(crt_loc, err);

		}

		/* End the default argument value */

		init_param(id, e);

		if (rescan) {

			IGNORE pop_namespace();

			end_templ_scope(fn);

		}

		/* Reset the parser */

		if (crt_access_list.pending) {

			IGNORE report_access(pid);

		}

		restore_state(&s);

		p = restore_parser();

		free_tok_list(p);

		functions_pending--;

	}

	return;

}

/*

    COMPILE ALL FUNCTIONS IN A NAMESPACE

    This routine scans through the current class and any nested classes

    compiling any function definitions which remain uncompiled.

*/

void

rescan_functions(void)

{

	CLASS_TYPE ct = crt_class;

	LIST(IDENTIFIER) ft = DEREF_list(ctype_nest(ct));

	while (!IS_NULL_list(ft)) {

		IDENTIFIER id = DEREF_id(HEAD_list(ft));

		switch (TAG_id(id)) {

		case id_class_name_tag: {

			/* Deal with nested classes */

			CLASS_TYPE cs;

			CLASS_INFO ci;

			NAMESPACE cns;

			TYPE t = DEREF_type(id_class_name_defn(id));

			TYPE s = begin_templ_scope(t);

			cs = DEREF_ctype(type_compound_defn(s));

			ci = DEREF_cinfo(ctype_info(cs));

			if (ci & cinfo_complete) {

				cns = DEREF_nspace(ctype_member(cs));

				push_class(cs);

				push_namespace(cns);

				rescan_functions();

				IGNORE pop_namespace();

				pop_class();

			}

			end_templ_scope(t);

			break;

		}

		case id_function_tag:

		case id_mem_func_tag:

		case id_stat_mem_func_tag:

			/* Deal with inline functions (including friends) */

			rescan_function(id);

			break;

		case id_parameter_tag:

			/* Deal with default arguments */

			rescan_param(id, 1);

			break;

		}

		ft = TAIL_list(ft);

	}

	return;

}