mirror of
https://git.code.sf.net/p/quake/quakeforge
synced 2024-11-14 08:50:58 +00:00
c84fb3e6d3
This gets gcd.pas working nicely with the Ruamoko ISA, and keeps things reasonably nice vor v6p (it will likely do better with global CSE).
530 lines
11 KiB
Text
530 lines
11 KiB
Text
%{
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/*
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qp-parse.y
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parser for quakepascal
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Copyright (C) 2011 Bill Currie <bill@taniwha.org>
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Author: Bill Currie <bill@taniwha.org>
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Date: 2011/01/06
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#ifdef HAVE_STRING_H
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# include <string.h>
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#endif
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#ifdef HAVE_STRINGS_H
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# include <strings.h>
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#endif
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#include "QF/dstring.h"
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#include "tools/qfcc/include/codespace.h"
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#include "tools/qfcc/include/diagnostic.h"
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#include "tools/qfcc/include/expr.h"
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#include "tools/qfcc/include/function.h"
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#include "tools/qfcc/include/qfcc.h"
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#include "tools/qfcc/include/reloc.h"
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#include "tools/qfcc/include/shared.h"
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#include "tools/qfcc/include/symtab.h"
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#include "tools/qfcc/include/type.h"
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#define YYDEBUG 1
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#define YYERROR_VERBOSE 1
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#undef YYERROR_VERBOSE
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extern char *qp_yytext;
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static void
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yyerror (const char *s)
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{
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#ifdef YYERROR_VERBOSE
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error (0, "%s %s\n", qp_yytext, s);
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#else
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error (0, "%s before %s", s, qp_yytext);
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#endif
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}
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static void
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parse_error (void)
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{
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error (0, "parse error before %s", qp_yytext);
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}
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#define PARSE_ERROR do { parse_error (); YYERROR; } while (0)
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int yylex (void);
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%}
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%union {
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int op;
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struct def_s *def;
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struct hashtab_s *def_list;
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struct type_s *type;
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struct typedef_s *typename;
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struct expr_s *expr;
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struct function_s *function;
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struct switch_block_s *switch_block;
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struct param_s *param;
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struct struct_s *strct;
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struct symtab_s *symtab;
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struct symbol_s *symbol;
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int storage;
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}
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// these tokens are common between qc and qp
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%left LOW
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%nonassoc IFX
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%nonassoc ELSE
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%nonassoc BREAK_PRIMARY
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%nonassoc ';'
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%nonassoc CLASS_NOT_CATEGORY
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%nonassoc STORAGEX
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%left COMMA
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%right <op> '=' ASX
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%right '?' ':'
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%left OR
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%left AND
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%left '|'
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%left '^'
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%left '&'
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%left EQ NE
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%left LT GT GE LE
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%token NAND NOR XNOR
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// end of tokens common between qc and qp
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%left <op> RELOP
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%left <op> ADDOP
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%left <op> MULOP
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%right UNARY
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%token <type> TYPE TYPE_NAME
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%token <symbol> ID
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%token <expr> VALUE
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%token PROGRAM VAR ARRAY OF FUNCTION PROCEDURE PBEGIN END IF THEN ELSE
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%token WHILE DO RANGE ASSIGNOP NOT ELLIPSIS
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%token RETURN
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%type <type> type standard_type
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%type <symbol> program_head identifier_list subprogram_head
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%type <symtab> param_scope
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%type <param> arguments parameter_list
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%type <expr> compound_statement else optional_statements statement_list
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%type <expr> statement procedure_statement
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%type <expr> expression_list expression unary_expr primary variable name
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%type <op> sign
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%{
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static void
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build_dotmain (symbol_t *program)
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{
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symbol_t *dotmain = new_symbol (".main");
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expr_t *code;
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expr_t *exitcode;
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dotmain->params = 0;
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dotmain->type = parse_params (&type_int, 0);
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dotmain->type = find_type (dotmain->type);
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dotmain = function_symbol (dotmain, 0, 1);
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exitcode = new_symbol_expr (symtab_lookup (current_symtab, "ExitCode"));
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current_func = begin_function (dotmain, 0, current_symtab, 0,
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current_storage);
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current_symtab = current_func->locals;
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code = new_block_expr ();
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append_expr (code, function_expr (new_symbol_expr (program), 0));
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append_expr (code, return_expr (current_func, exitcode));
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build_code_function (dotmain, 0, code);
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}
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static symbol_t *
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function_value (function_t *func)
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{
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symbol_t *ret = 0;
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if (func->type->t.func.type) {
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ret = symtab_lookup (func->locals, ".ret");
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if (!ret || ret->table != func->locals) {
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ret = new_symbol_type (".ret", func->type->t.func.type);
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initialize_def (ret, 0, func->locals->space, sc_local,
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func->locals);
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}
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}
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return ret;
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}
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static expr_t *
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function_return (function_t *func)
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{
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symbol_t *ret = function_value (func);
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expr_t *ret_val = 0;
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if (ret) {
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ret_val = new_symbol_expr (ret);
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}
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return ret_val;
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}
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%}
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%%
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program
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: program_head
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declarations
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subprogram_declarations
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compound_statement '.'
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{
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symtab_t *st = current_symtab;
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// move the symbol for the program name to the end of the list
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symtab_removesymbol (current_symtab, $1);
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symtab_addsymbol (current_symtab, $1);
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current_func = begin_function ($1, 0, current_symtab, 0,
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current_storage);
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current_symtab = current_func->locals;
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build_code_function ($1, 0, $4);
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current_symtab = st;
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build_dotmain ($1);
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current_symtab = st;
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}
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;
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program_head
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: PROGRAM { current_symtab = pr.symtab; }
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ID '(' opt_identifier_list ')' ';'
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{
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$$ = $3;
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// FIXME need units and standard units
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{
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symbol_t *sym = new_symbol ("ExitCode");
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sym->type = &type_int;
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initialize_def (sym, 0, current_symtab->space, sc_global,
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current_symtab);
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if (sym->s.def) {
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sym->s.def->nosave = 1;
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}
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}
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$$->type = parse_params (&type_void, 0);
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$$->type = find_type ($$->type);
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$$ = function_symbol ($$, 0, 1);
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}
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;
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opt_identifier_list
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: /* empty */
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| identifier_list
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;
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identifier_list
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: ID { $$ = check_redefined ($1); }
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| identifier_list ',' ID
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{
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symbol_t **s;
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$$ = $1;
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$3 = check_redefined ($3);
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for (s = &$$; *s; s = &(*s)->next)
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;
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*s = $3;
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}
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;
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declarations
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: declarations VAR identifier_list ':' type ';'
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{
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while ($3) {
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symbol_t *next = $3->next;
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$3->type = $5;
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initialize_def ($3, 0, current_symtab->space, current_storage,
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current_symtab);
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$3 = next;
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}
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}
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| /* empty */
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;
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type
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: standard_type
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| ARRAY '[' VALUE RANGE VALUE ']' OF standard_type
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{
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$$ = based_array_type ($8, expr_int ($3), expr_int ($5));
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}
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;
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standard_type
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: TYPE
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| TYPE_NAME
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;
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subprogram_declarations
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: subprogram_declarations subprogram_declaration
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| /* emtpy */
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;
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subprogram_declaration
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: subprogram_head ';'
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{
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$<storage>$ = current_storage;
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current_func = begin_function ($1, 0, current_symtab, 0,
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current_storage);
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current_symtab = current_func->locals;
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current_storage = sc_local;
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function_value (current_func);
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}
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declarations compound_statement ';'
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{
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append_expr ($5, new_return_expr (function_return (current_func)));
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build_code_function ($1, 0, $5);
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current_symtab = current_func->parameters->parent;
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current_storage = $<storage>3;
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}
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| subprogram_head ASSIGNOP '#' VALUE ';'
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{
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build_builtin_function ($1, $4, 0, current_storage);
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}
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;
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subprogram_head
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: FUNCTION ID arguments ':' standard_type
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{
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$$ = $2;
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if ($$->table == current_symtab) {
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error (0, "%s redefined", $$->name);
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} else {
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$$->params = $3;
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$$->type = parse_params ($5, $3);
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$$->type = find_type ($$->type);
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$$ = function_symbol ($$, 0, 1);
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}
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}
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| PROCEDURE ID arguments
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{
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$$ = $2;
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if ($$->table == current_symtab) {
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error (0, "%s redefined", $$->name);
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} else {
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$$->params = $3;
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$$->type = parse_params (&type_void, $3);
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$$->type = find_type ($$->type);
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$$ = function_symbol ($$, 0, 1);
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}
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}
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;
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arguments
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: '(' param_scope parameter_list ')'
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{
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$$ = $3;
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current_symtab = $2;
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}
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| '(' param_scope parameter_list ';' ELLIPSIS ')'
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{
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$$ = param_append_identifiers ($3, 0, 0);
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current_symtab = $2;
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}
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| '(' ELLIPSIS ')' { $$ = new_param (0, 0, 0); }
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| /* emtpy */ { $$ = 0; }
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;
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param_scope
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: /* empty */
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{
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$$ = current_symtab;
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current_symtab = new_symtab (current_symtab, stab_local);
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}
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;
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parameter_list
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: identifier_list ':' type
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{
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$$ = param_append_identifiers (0, $1, $3);
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}
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| parameter_list ';' identifier_list ':' type
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{
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$$ = param_append_identifiers ($1, $3, $5);
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}
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;
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compound_statement
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: PBEGIN optional_statements END { $$ = $2; }
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;
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optional_statements
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: statement_list opt_semi
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| /* emtpy */ { $$ = 0; }
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;
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opt_semi
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: ';'
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| /* empty */
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;
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statement_list
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: statement
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{
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$$ = new_block_expr ();
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append_expr ($$, $1);
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}
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| statement_list ';' statement
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{
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$$ = $1;
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append_expr ($$, $3);
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}
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;
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statement
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: variable ASSIGNOP expression
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{
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$$ = $1;
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if ($$->type == ex_symbol && $$->e.symbol->sy_type == sy_func) {
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if ($$->e.symbol->s.func != current_func) {
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$$ = error ($$, "cannot assign to other function");
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} else {
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symbol_t *ret = function_value (current_func);
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if (!ret) {
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$$ = error ($$, "cannot assign to procedure");
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} else {
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$$ = new_symbol_expr (ret);
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}
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}
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}
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$$ = assign_expr ($$, $3);
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}
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| procedure_statement
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| compound_statement
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| IF expression THEN statement else statement
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{
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$$ = build_if_statement (0, $2, $4, $5, $6);
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}
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| IF expression THEN statement %prec IFX
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{
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$$ = build_if_statement (0, $2, $4, 0, 0);
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}
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| WHILE expression DO statement
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{
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$$ = build_while_statement (0, $2, $4,
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new_label_expr (),
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new_label_expr ());
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}
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| RETURN
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{
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$$ = return_expr (current_func, function_return (current_func));
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}
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;
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else
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: ELSE
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{
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// this is only to get the the file and line number info
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$$ = new_nil_expr ();
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}
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;
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variable
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: name
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| name '[' expression ']' { $$ = array_expr ($1, $3); }
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;
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procedure_statement
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: name { $$ = function_expr ($1, 0); }
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| name '(' expression_list ')' { $$ = function_expr ($1, $3); }
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;
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expression_list
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: expression
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| expression_list ',' expression
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{
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$$ = $3;
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$$->next = $1;
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}
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;
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unary_expr
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: primary
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| sign unary_expr %prec UNARY { $$ = unary_expr ($1, $2); }
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| NOT expression %prec UNARY { $$ = unary_expr ('!', $2); }
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;
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primary
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: variable
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{
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$$ = $1;
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if ($$->type == ex_symbol && extract_type ($$) == ev_func)
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$$ = function_expr ($$, 0);
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}
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| VALUE
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| name '(' expression_list ')' { $$ = function_expr ($1, $3); }
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| '(' expression ')' { $$ = $2; }
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;
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expression
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: unary_expr
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| expression RELOP expression { $$ = binary_expr ($2, $1, $3); }
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| expression ADDOP expression
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{
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if ($2 == 'o')
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$$ = bool_expr (OR, new_label_expr (), $1, $3);
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else
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$$ = binary_expr ($2, $1, $3);
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}
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| expression MULOP expression
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{
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if ($2 == 'd')
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$2 = '/';
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else if ($2 == 'm')
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$2 = '%';
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if ($2 == 'a')
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$$ = bool_expr (AND, new_label_expr (), $1, $3);
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else
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$$ = binary_expr ($2, $1, $3);
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}
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;
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sign
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: ADDOP
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{
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if ($$ == 'o')
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PARSE_ERROR;
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}
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;
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name
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: ID
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{
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if (!$1->table) {
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error (0, "%s undefined", $1->name);
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$1->type = &type_int;
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symtab_addsymbol (current_symtab, $1);
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}
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$$ = new_symbol_expr ($1);
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}
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;
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%%
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