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quakeforge/tools/qfcc/source/qp-parse.y
Bill Currie f307c7bebc Rework the unary_expr grammar to allow ++*foo. 
This required throwing out the primary rules that snax did up to help me
with conflicts many years ago, but they were now getting in the way. Now
the productions from primary are merged in with unary_expr.
2012-11-09 12:32:38 +09:00

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%{
/*
qp-parse.y
parser for quakepascal
Copyright (C) 2011 Bill Currie <bill@taniwha.org>
Author: Bill Currie <bill@taniwha.org>
Date: 2011/01/06
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to:
Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#include "QF/dstring.h"
#include "codespace.h"
#include "diagnostic.h"
#include "expr.h"
#include "function.h"
#include "qfcc.h"
#include "reloc.h"
#include "shared.h"
#include "symtab.h"
#include "type.h"
#define YYDEBUG 1
#define YYERROR_VERBOSE 1
#undef YYERROR_VERBOSE
extern char *qp_yytext;
static void
yyerror (const char *s)
{
#ifdef YYERROR_VERBOSE
error (0, "%s %s\n", qp_yytext, s);
#else
error (0, "%s before %s", s, qp_yytext);
#endif
}
static void
parse_error (void)
{
error (0, "parse error before %s", qp_yytext);
}
#define PARSE_ERROR do { parse_error (); YYERROR; } while (0)
int yylex (void);
%}
%union {
int op;
struct def_s *def;
struct hashtab_s *def_list;
struct type_s *type;
struct typedef_s *typename;
struct expr_s *expr;
struct function_s *function;
struct switch_block_s *switch_block;
struct param_s *param;
struct struct_s *strct;
struct symtab_s *symtab;
struct symbol_s *symbol;
int storage;
}
// these tokens are common between qc and qp
%left LOW
%nonassoc IFX
%nonassoc ELSE
%nonassoc BREAK_PRIMARY
%nonassoc ';'
%nonassoc CLASS_NOT_CATEGORY
%nonassoc STORAGEX
%left COMMA
%right <op> '=' ASX PAS /* pointer assign */
%right '?' ':'
%left OR
%left AND
%left '|'
%left '^'
%left '&'
%left EQ NE
%left LE GE LT GT
// end of tokens common between qc and qp
%left <op> RELOP
%left <op> ADDOP
%left <op> MULOP
%right UNARY
%token <type> TYPE TYPE_NAME
%token <symbol> ID
%token <expr> CONST
%token PROGRAM VAR ARRAY OF FUNCTION PROCEDURE PBEGIN END IF THEN ELSE
%token WHILE DO RANGE ASSIGNOP NOT ELLIPSIS
%token RETURN
%type <type> type standard_type
%type <symbol> program_head identifier_list subprogram_head
%type <symtab> param_scope
%type <param> arguments parameter_list
%type <expr> compound_statement optional_statements statement_list
%type <expr> statement procedure_statement
%type <expr> expression_list expression unary_expr primary variable name
%type <op> sign
%{
%}
%%
program
: program_head
declarations
subprogram_declarations
compound_statement '.'
{
symtab_t *st = current_symtab;
// move the symbol for the program name to the end of the list
symtab_removesymbol (current_symtab, $1);
symtab_addsymbol (current_symtab, $1);
current_func = begin_function ($1, 0, current_symtab, 0);
current_symtab = current_func->symtab;
build_code_function ($1, 0, $4);
current_symtab = st;
$4 = function_expr (new_symbol_expr ($1), 0);
$1 = new_symbol (".main");
$1->params = 0;
$1->type = parse_params (&type_void, 0);
$1->type = find_type ($1->type);
$1 = function_symbol ($1, 0, 1);
current_func = begin_function ($1, 0, current_symtab, 0);
current_symtab = current_func->symtab;
build_code_function ($1, 0, $4);
current_symtab = st;
}
;
program_head
: PROGRAM { current_symtab = pr.symtab; }
ID '(' opt_identifier_list ')' ';'
{
$$ = $3;
$$->type = parse_params (&type_void, 0);
$$->type = find_type ($$->type);
$$ = function_symbol ($$, 0, 1);
}
;
opt_identifier_list
: /* empty */
| identifier_list
;
identifier_list
: ID { $$ = check_redefined ($1); }
| identifier_list ',' ID
{
symbol_t **s;
$$ = $1;
$3 = check_redefined ($3);
for (s = &$$; *s; s = &(*s)->next)
;
*s = $3;
}
;
declarations
: declarations VAR identifier_list ':' type ';'
{
while ($3) {
symbol_t *next = $3->next;
initialize_def ($3, $5, 0, current_symtab->space,
current_storage);
$3 = next;
}
}
| /* empty */
;
type
: standard_type
| ARRAY '[' CONST RANGE CONST ']' OF standard_type
{
$$ = based_array_type ($8, expr_integer ($3), expr_integer ($5));
}
;
standard_type
: TYPE
| TYPE_NAME
;
subprogram_declarations
: subprogram_declarations subprogram_declaration
| /* emtpy */
;
subprogram_declaration
: subprogram_head ';'
{
$<storage>$ = current_storage;
current_func = begin_function ($1, 0, current_symtab, 0);
current_symtab = current_func->symtab;
current_storage = st_local;
}
declarations compound_statement ';'
{
append_expr ($5, new_unary_expr ('r', 0));
build_code_function ($1, 0, $5);
current_symtab = current_symtab->parent;
current_storage = $<storage>3;
}
| subprogram_head ASSIGNOP '#' CONST ';'
{
build_builtin_function ($1, $4, 0);
}
;
subprogram_head
: FUNCTION ID arguments ':' standard_type
{
$$ = $2;
if ($$->table == current_symtab) {
error (0, "%s redefined", $$->name);
} else {
$$->params = $3;
$$->type = parse_params ($5, $3);
$$->type = find_type ($$->type);
$$ = function_symbol ($$, 0, 1);
}
}
| PROCEDURE ID arguments
{
$$ = $2;
if ($$->table == current_symtab) {
error (0, "%s redefined", $$->name);
} else {
$$->params = $3;
$$->type = parse_params (&type_void, $3);
$$->type = find_type ($$->type);
$$ = function_symbol ($$, 0, 1);
}
}
;
arguments
: '(' param_scope parameter_list ')'
{
$$ = $3;
current_symtab = $2;
}
| '(' param_scope parameter_list ';' ELLIPSIS ')'
{
$$ = param_append_identifiers ($3, 0, 0);
current_symtab = $2;
}
| '(' ELLIPSIS ')' { $$ = new_param (0, 0, 0); }
| /* emtpy */ { $$ = 0; }
;
param_scope
: /* empty */
{
$$ = current_symtab;
current_symtab = new_symtab (current_symtab, stab_local);
}
;
parameter_list
: identifier_list ':' type
{
$$ = param_append_identifiers (0, $1, $3);
}
| parameter_list ';' identifier_list ':' type
{
$$ = param_append_identifiers ($1, $3, $5);
}
;
compound_statement
: PBEGIN optional_statements END { $$ = $2; }
;
optional_statements
: statement_list opt_semi
| /* emtpy */ { $$ = 0; }
;
opt_semi
: ';'
| /* empty */
;
statement_list
: statement
{
$$ = new_block_expr ();
append_expr ($$, $1);
}
| statement_list ';' statement
{
$$ = $1;
append_expr ($$, $3);
}
;
statement
: variable ASSIGNOP expression
{
$$ = $1;
if ($$->type == ex_symbol && extract_type ($$) == ev_func)
$$ = new_ret_expr ($$->e.symbol->type->t.func.type);
$$ = assign_expr ($$, $3);
}
| procedure_statement
| compound_statement
| IF expression THEN statement ELSE statement
{
$$ = build_if_statement ($2, $4, $6);
}
| IF expression THEN statement %prec IFX
{
$$ = build_if_statement ($2, $4, 0);
}
| WHILE expression DO statement
{
$$ = build_while_statement ($2, $4,
new_label_expr (),
new_label_expr ());
}
| RETURN
{
$$ = return_expr (current_func, 0);
}
;
variable
: name
| name '[' expression ']' { $$ = array_expr ($1, $3); }
;
procedure_statement
: name { $$ = function_expr ($1, 0); }
| name '(' expression_list ')' { $$ = function_expr ($1, $3); }
;
expression_list
: expression
| expression_list ',' expression
{
$$ = $3;
$$->next = $1;
}
;
unary_expr
: primary
| sign unary_expr %prec UNARY { $$ = unary_expr ($1, $2); }
| NOT expression %prec UNARY { $$ = unary_expr ('!', $2); }
;
primary
: variable
{
$$ = $1;
if ($$->type == ex_symbol && extract_type ($$) == ev_func)
$$ = function_expr ($$, 0);
}
| CONST
| name '(' expression_list ')' { $$ = function_expr ($1, $3); }
| '(' expression ')' { $$ = $2; }
;
expression
: unary_expr
| expression RELOP expression { $$ = binary_expr ($2, $1, $3); }
| expression ADDOP expression
{
if ($2 == 'o')
$$ = bool_expr (OR, new_label_expr (), $1, $3);
else
$$ = binary_expr ($2, $1, $3);
}
| expression MULOP expression
{
if ($2 == 'd')
$2 = '/';
else if ($2 == 'm')
$2 = '%';
if ($2 == 'a')
$$ = bool_expr (AND, new_label_expr (), $1, $3);
else
$$ = binary_expr ($2, $1, $3);
}
;
sign
: ADDOP
{
if ($$ == 'o')
PARSE_ERROR;
}
;
name
: ID
{
if (!$1->table) {
error (0, "%s undefined", $1->name);
$1->type = &type_integer;
symtab_addsymbol (current_symtab, $1);
}
$$ = new_symbol_expr ($1);
}
;
%%
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