2435 lines
54 KiB
Plaintext
2435 lines
54 KiB
Plaintext
/*
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* awk.y --- yacc/bison parser
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*/
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/*
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* Copyright (C) 1986, 1988, 1989, 1991-1997 the Free Software Foundation, Inc.
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*
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* This file is part of GAWK, the GNU implementation of the
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* AWK Programming Language.
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*
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* GAWK is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* GAWK 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. See the
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* GNU General Public License for more details.
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*
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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 the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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%{
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#ifdef DEBUG
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#define YYDEBUG 12
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#endif
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#include "awk.h"
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#define CAN_FREE TRUE
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#define DONT_FREE FALSE
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#if defined(HAVE_STDARG_H) && defined(__STDC__) && __STDC__
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static void yyerror(const char *m, ...) ;
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#else
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static void yyerror(); /* va_alist */
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#endif
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static char *get_src_buf P((void));
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static int yylex P((void));
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static NODE *node_common P((NODETYPE op));
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static NODE *snode P((NODE *subn, NODETYPE op, int sindex));
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static NODE *mkrangenode P((NODE *cpair));
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static NODE *make_for_loop P((NODE *init, NODE *cond, NODE *incr));
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static NODE *append_right P((NODE *list, NODE *new));
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static void func_install P((NODE *params, NODE *def));
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static void pop_var P((NODE *np, int freeit));
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static void pop_params P((NODE *params));
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static NODE *make_param P((char *name));
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static NODE *mk_rexp P((NODE *exp));
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static int dup_parms P((NODE *func));
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static void param_sanity P((NODE *arglist));
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static int isnoeffect P((NODETYPE t));
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static int isassignable P((NODE *n));
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enum defref { FUNC_DEFINE, FUNC_USE };
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static void func_use P((char *name, enum defref how));
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static void check_funcs P((void));
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static int want_assign; /* lexical scanning kludge */
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static int want_regexp; /* lexical scanning kludge */
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static int can_return; /* lexical scanning kludge */
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static int io_allowed = TRUE; /* lexical scanning kludge */
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static char *lexptr; /* pointer to next char during parsing */
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static char *lexend;
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static char *lexptr_begin; /* keep track of where we were for error msgs */
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static char *lexeme; /* beginning of lexeme for debugging */
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static char *thisline = NULL;
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#define YYDEBUG_LEXER_TEXT (lexeme)
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static int param_counter;
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static char *tokstart = NULL;
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static char *tok = NULL;
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static char *tokend;
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#define HASHSIZE 1021 /* this constant only used here */
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NODE *variables[HASHSIZE];
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extern char *source;
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extern int sourceline;
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extern struct src *srcfiles;
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extern int numfiles;
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extern int errcount;
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extern NODE *begin_block;
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extern NODE *end_block;
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%}
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%union {
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long lval;
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AWKNUM fval;
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NODE *nodeval;
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NODETYPE nodetypeval;
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char *sval;
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NODE *(*ptrval)();
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}
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%type <nodeval> function_prologue function_body
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%type <nodeval> rexp exp start program rule simp_exp
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%type <nodeval> non_post_simp_exp
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%type <nodeval> pattern
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%type <nodeval> action variable param_list
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%type <nodeval> rexpression_list opt_rexpression_list
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%type <nodeval> expression_list opt_expression_list
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%type <nodeval> statements statement if_statement opt_param_list
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%type <nodeval> opt_exp opt_variable regexp
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%type <nodeval> input_redir output_redir
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%type <nodetypeval> print
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%type <sval> func_name
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%type <lval> lex_builtin
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%token <sval> FUNC_CALL NAME REGEXP
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%token <lval> ERROR
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%token <nodeval> YNUMBER YSTRING
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%token <nodetypeval> RELOP APPEND_OP
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%token <nodetypeval> ASSIGNOP MATCHOP NEWLINE CONCAT_OP
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%token <nodetypeval> LEX_BEGIN LEX_END LEX_IF LEX_ELSE LEX_RETURN LEX_DELETE
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%token <nodetypeval> LEX_WHILE LEX_DO LEX_FOR LEX_BREAK LEX_CONTINUE
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%token <nodetypeval> LEX_PRINT LEX_PRINTF LEX_NEXT LEX_EXIT LEX_FUNCTION
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%token <nodetypeval> LEX_GETLINE LEX_NEXTFILE
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%token <nodetypeval> LEX_IN
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%token <lval> LEX_AND LEX_OR INCREMENT DECREMENT
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%token <lval> LEX_BUILTIN LEX_LENGTH
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/* these are just yylval numbers */
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/* Lowest to highest */
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%right ASSIGNOP
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%right '?' ':'
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%left LEX_OR
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%left LEX_AND
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%left LEX_GETLINE
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%nonassoc LEX_IN
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%left FUNC_CALL LEX_BUILTIN LEX_LENGTH
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%nonassoc ','
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%nonassoc MATCHOP
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%nonassoc RELOP '<' '>' '|' APPEND_OP
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%left CONCAT_OP
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%left YSTRING YNUMBER
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%left '+' '-'
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%left '*' '/' '%'
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%right '!' UNARY
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%right '^'
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%left INCREMENT DECREMENT
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%left '$'
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%left '(' ')'
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%%
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start
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: opt_nls program opt_nls
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{
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expression_value = $2;
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check_funcs();
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}
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;
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program
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: rule
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{
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if ($1 != NULL)
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$$ = $1;
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else
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$$ = NULL;
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yyerrok;
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}
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| program rule
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/* add the rule to the tail of list */
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{
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if ($2 == NULL)
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$$ = $1;
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else if ($1 == NULL)
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$$ = $2;
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else {
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if ($1->type != Node_rule_list)
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$1 = node($1, Node_rule_list,
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(NODE*) NULL);
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$$ = append_right($1,
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node($2, Node_rule_list, (NODE *) NULL));
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}
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yyerrok;
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}
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| error { $$ = NULL; }
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| program error { $$ = NULL; }
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| /* empty */ { $$ = NULL; }
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;
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rule
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: LEX_BEGIN { io_allowed = FALSE; }
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action
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{
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if (begin_block != NULL) {
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if (begin_block->type != Node_rule_list)
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begin_block = node(begin_block, Node_rule_list,
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(NODE *) NULL);
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(void) append_right(begin_block, node(
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node((NODE *) NULL, Node_rule_node, $3),
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Node_rule_list, (NODE *) NULL) );
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} else
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begin_block = node((NODE *) NULL, Node_rule_node, $3);
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$$ = NULL;
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io_allowed = TRUE;
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yyerrok;
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}
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| LEX_END { io_allowed = FALSE; }
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action
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{
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if (end_block != NULL) {
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if (end_block->type != Node_rule_list)
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end_block = node(end_block, Node_rule_list,
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(NODE *) NULL);
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(void) append_right (end_block, node(
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node((NODE *) NULL, Node_rule_node, $3),
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Node_rule_list, (NODE *) NULL));
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} else
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end_block = node((NODE *) NULL, Node_rule_node, $3);
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$$ = NULL;
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io_allowed = TRUE;
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yyerrok;
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}
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| LEX_BEGIN statement_term
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{
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warning("BEGIN blocks must have an action part");
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errcount++;
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yyerrok;
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}
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| LEX_END statement_term
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{
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warning("END blocks must have an action part");
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errcount++;
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yyerrok;
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}
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| pattern action
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{ $$ = node($1, Node_rule_node, $2); yyerrok; }
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| action
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{ $$ = node((NODE *) NULL, Node_rule_node, $1); yyerrok; }
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| pattern statement_term
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{
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$$ = node($1,
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Node_rule_node,
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node(node(node(make_number(0.0),
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Node_field_spec,
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(NODE *) NULL),
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Node_expression_list,
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(NODE *) NULL),
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Node_K_print,
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(NODE *) NULL));
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yyerrok;
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}
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| function_prologue function_body
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{
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func_install($1, $2);
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$$ = NULL;
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yyerrok;
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}
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;
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func_name
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: NAME
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{ $$ = $1; }
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| FUNC_CALL
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{ $$ = $1; }
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| lex_builtin
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{
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yyerror("%s() is a built-in function, it cannot be redefined",
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tokstart);
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errcount++;
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/* yyerrok; */
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}
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;
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lex_builtin
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: LEX_BUILTIN
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| LEX_LENGTH
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;
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function_prologue
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: LEX_FUNCTION
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{
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param_counter = 0;
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}
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func_name '(' opt_param_list r_paren opt_nls
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{
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NODE *t;
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t = make_param($3);
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t->flags |= FUNC;
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$$ = append_right(t, $5);
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can_return = TRUE;
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/* check for duplicate parameter names */
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if (dup_parms($$))
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errcount++;
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}
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;
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function_body
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: l_brace statements r_brace opt_semi
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{
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$$ = $2;
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can_return = FALSE;
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}
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| l_brace r_brace opt_semi opt_nls
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{
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$$ = node((NODE *) NULL, Node_K_return, (NODE *) NULL);
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can_return = FALSE;
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}
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;
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pattern
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: exp
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{ $$ = $1; }
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| exp ',' exp
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{ $$ = mkrangenode(node($1, Node_cond_pair, $3)); }
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;
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regexp
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/*
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* In this rule, want_regexp tells yylex that the next thing
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* is a regexp so it should read up to the closing slash.
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*/
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: '/'
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{ ++want_regexp; }
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REGEXP '/'
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{
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NODE *n;
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size_t len;
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getnode(n);
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n->type = Node_regex;
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len = strlen($3);
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n->re_exp = make_string($3, len);
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n->re_reg = make_regexp($3, len, FALSE, TRUE);
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n->re_text = NULL;
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n->re_flags = CONST;
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n->re_cnt = 1;
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$$ = n;
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}
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;
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action
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: l_brace statements r_brace opt_semi opt_nls
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{ $$ = $2; }
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| l_brace r_brace opt_semi opt_nls
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{ $$ = NULL; }
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;
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statements
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: statement
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{
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$$ = $1;
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if (do_lint && isnoeffect($$->type))
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warning("statement may have no effect");
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}
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| statements statement
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{
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if ($1 == NULL || $1->type != Node_statement_list)
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$1 = node($1, Node_statement_list, (NODE *) NULL);
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$$ = append_right($1,
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node($2, Node_statement_list, (NODE *) NULL));
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yyerrok;
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}
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| error
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{ $$ = NULL; }
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| statements error
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{ $$ = NULL; }
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;
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statement_term
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: nls
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| semi opt_nls
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;
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statement
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: semi opt_nls
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{ $$ = NULL; }
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| l_brace r_brace
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{ $$ = NULL; }
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| l_brace statements r_brace
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{ $$ = $2; }
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| if_statement
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{ $$ = $1; }
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| LEX_WHILE '(' exp r_paren opt_nls statement
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{ $$ = node($3, Node_K_while, $6); }
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| LEX_DO opt_nls statement LEX_WHILE '(' exp r_paren opt_nls
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{ $$ = node($6, Node_K_do, $3); }
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| LEX_FOR '(' NAME LEX_IN NAME r_paren opt_nls statement
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{
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$$ = node($8, Node_K_arrayfor,
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make_for_loop(variable($3, CAN_FREE, Node_var),
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(NODE *) NULL, variable($5, CAN_FREE, Node_var_array)));
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}
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| LEX_FOR '(' opt_exp semi exp semi opt_exp r_paren opt_nls statement
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{
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$$ = node($10, Node_K_for, (NODE *) make_for_loop($3, $5, $7));
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}
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| LEX_FOR '(' opt_exp semi semi opt_exp r_paren opt_nls statement
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{
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$$ = node($9, Node_K_for,
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(NODE *) make_for_loop($3, (NODE *) NULL, $6));
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}
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| LEX_BREAK statement_term
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/* for break, maybe we'll have to remember where to break to */
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{ $$ = node((NODE *) NULL, Node_K_break, (NODE *) NULL); }
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| LEX_CONTINUE statement_term
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/* similarly */
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{ $$ = node((NODE *) NULL, Node_K_continue, (NODE *) NULL); }
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| print '(' expression_list r_paren output_redir statement_term
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{ $$ = node($3, $1, $5); }
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| print opt_rexpression_list output_redir statement_term
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{
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if ($1 == Node_K_print && $2 == NULL) {
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static int warned = FALSE;
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$2 = node(node(make_number(0.0),
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Node_field_spec,
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(NODE *) NULL),
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Node_expression_list,
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(NODE *) NULL);
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if (do_lint && ! io_allowed && ! warned) {
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warned = TRUE;
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warning(
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"plain `print' in BEGIN or END rule should probably be `print \"\"'");
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}
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}
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$$ = node($2, $1, $3);
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}
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| LEX_NEXT opt_exp statement_term
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{ NODETYPE type;
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if ($2) {
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if ($2 == lookup("file")) {
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static int warned = FALSE;
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if (! warned) {
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warned = TRUE;
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warning("`next file' is obsolete; use `nextfile'");
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}
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if (do_lint)
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warning("`next file' is a gawk extension");
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if (do_traditional) {
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/*
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* can't use yyerror, since may have overshot
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* the source line
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*/
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errcount++;
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error("`next file' is a gawk extension");
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}
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if (! io_allowed) {
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/* same thing */
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errcount++;
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error("`next file' used in BEGIN or END action");
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}
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type = Node_K_nextfile;
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} else {
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errcount++;
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error("illegal expression after `next'");
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type = Node_K_next; /* sanity */
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}
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} else {
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if (! io_allowed)
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yyerror("`next' used in BEGIN or END action");
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type = Node_K_next;
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}
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$$ = node((NODE *) NULL, type, (NODE *) NULL);
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}
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| LEX_NEXTFILE statement_term
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{
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if (do_lint)
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warning("`nextfile' is a gawk extension");
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if (do_traditional) {
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/*
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* can't use yyerror, since may have overshot
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* the source line
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*/
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errcount++;
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error("`nextfile' is a gawk extension");
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}
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if (! io_allowed) {
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/* same thing */
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errcount++;
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error("`nextfile' used in BEGIN or END action");
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}
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$$ = node((NODE *) NULL, Node_K_nextfile, (NODE *) NULL);
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}
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| LEX_EXIT opt_exp statement_term
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{ $$ = node($2, Node_K_exit, (NODE *) NULL); }
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| LEX_RETURN
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{
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if (! can_return)
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yyerror("`return' used outside function context");
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}
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opt_exp statement_term
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{ $$ = node($3, Node_K_return, (NODE *) NULL); }
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|
| LEX_DELETE NAME '[' expression_list ']' statement_term
|
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{ $$ = node(variable($2, CAN_FREE, Node_var_array), Node_K_delete, $4); }
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|
| LEX_DELETE NAME statement_term
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{
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if (do_lint)
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warning("`delete array' is a gawk extension");
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if (do_traditional) {
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/*
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* can't use yyerror, since may have overshot
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* the source line
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*/
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errcount++;
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error("`delete array' is a gawk extension");
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}
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$$ = node(variable($2, CAN_FREE, Node_var_array), Node_K_delete, (NODE *) NULL);
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}
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| exp statement_term
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{ $$ = $1; }
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;
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print
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: LEX_PRINT
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{ $$ = $1; }
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| LEX_PRINTF
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{ $$ = $1; }
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;
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|
|
if_statement
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: LEX_IF '(' exp r_paren opt_nls statement
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{
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$$ = node($3, Node_K_if,
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node($6, Node_if_branches, (NODE *) NULL));
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}
|
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| LEX_IF '(' exp r_paren opt_nls statement
|
|
LEX_ELSE opt_nls statement
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{ $$ = node($3, Node_K_if,
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node($6, Node_if_branches, $9)); }
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|
;
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|
|
nls
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: NEWLINE
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|
{ want_assign = FALSE; }
|
|
| nls NEWLINE
|
|
;
|
|
|
|
opt_nls
|
|
: /* empty */
|
|
| nls
|
|
;
|
|
|
|
input_redir
|
|
: /* empty */
|
|
{ $$ = NULL; }
|
|
| '<' simp_exp
|
|
{ $$ = node($2, Node_redirect_input, (NODE *) NULL); }
|
|
;
|
|
|
|
output_redir
|
|
: /* empty */
|
|
{ $$ = NULL; }
|
|
| '>' exp
|
|
{ $$ = node($2, Node_redirect_output, (NODE *) NULL); }
|
|
| APPEND_OP exp
|
|
{ $$ = node($2, Node_redirect_append, (NODE *) NULL); }
|
|
| '|' exp
|
|
{ $$ = node($2, Node_redirect_pipe, (NODE *) NULL); }
|
|
;
|
|
|
|
opt_param_list
|
|
: /* empty */
|
|
{ $$ = NULL; }
|
|
| param_list
|
|
{ $$ = $1; }
|
|
;
|
|
|
|
param_list
|
|
: NAME
|
|
{ $$ = make_param($1); }
|
|
| param_list comma NAME
|
|
{ $$ = append_right($1, make_param($3)); yyerrok; }
|
|
| error
|
|
{ $$ = NULL; }
|
|
| param_list error
|
|
{ $$ = NULL; }
|
|
| param_list comma error
|
|
{ $$ = NULL; }
|
|
;
|
|
|
|
/* optional expression, as in for loop */
|
|
opt_exp
|
|
: /* empty */
|
|
{ $$ = NULL; }
|
|
| exp
|
|
{ $$ = $1; }
|
|
;
|
|
|
|
opt_rexpression_list
|
|
: /* empty */
|
|
{ $$ = NULL; }
|
|
| rexpression_list
|
|
{ $$ = $1; }
|
|
;
|
|
|
|
rexpression_list
|
|
: rexp
|
|
{ $$ = node($1, Node_expression_list, (NODE *) NULL); }
|
|
| rexpression_list comma rexp
|
|
{
|
|
$$ = append_right($1,
|
|
node($3, Node_expression_list, (NODE *) NULL));
|
|
yyerrok;
|
|
}
|
|
| error
|
|
{ $$ = NULL; }
|
|
| rexpression_list error
|
|
{ $$ = NULL; }
|
|
| rexpression_list error rexp
|
|
{ $$ = NULL; }
|
|
| rexpression_list comma error
|
|
{ $$ = NULL; }
|
|
;
|
|
|
|
opt_expression_list
|
|
: /* empty */
|
|
{ $$ = NULL; }
|
|
| expression_list
|
|
{ $$ = $1; }
|
|
;
|
|
|
|
expression_list
|
|
: exp
|
|
{ $$ = node($1, Node_expression_list, (NODE *) NULL); }
|
|
| expression_list comma exp
|
|
{
|
|
$$ = append_right($1,
|
|
node($3, Node_expression_list, (NODE *) NULL));
|
|
yyerrok;
|
|
}
|
|
| error
|
|
{ $$ = NULL; }
|
|
| expression_list error
|
|
{ $$ = NULL; }
|
|
| expression_list error exp
|
|
{ $$ = NULL; }
|
|
| expression_list comma error
|
|
{ $$ = NULL; }
|
|
;
|
|
|
|
/* Expressions, not including the comma operator. */
|
|
exp : variable ASSIGNOP
|
|
{ want_assign = FALSE; }
|
|
exp
|
|
{
|
|
if (do_lint && $4->type == Node_regex)
|
|
warning("Regular expression on left of assignment.");
|
|
$$ = node($1, $2, $4);
|
|
}
|
|
| '(' expression_list r_paren LEX_IN NAME
|
|
{ $$ = node(variable($5, CAN_FREE, Node_var_array), Node_in_array, $2); }
|
|
| exp '|' LEX_GETLINE opt_variable
|
|
{
|
|
$$ = node($4, Node_K_getline,
|
|
node($1, Node_redirect_pipein, (NODE *) NULL));
|
|
}
|
|
| LEX_GETLINE opt_variable input_redir
|
|
{
|
|
if (do_lint && ! io_allowed && $3 == NULL)
|
|
warning("non-redirected getline undefined inside BEGIN or END action");
|
|
$$ = node($2, Node_K_getline, $3);
|
|
}
|
|
| exp LEX_AND exp
|
|
{ $$ = node($1, Node_and, $3); }
|
|
| exp LEX_OR exp
|
|
{ $$ = node($1, Node_or, $3); }
|
|
| exp MATCHOP exp
|
|
{
|
|
if ($1->type == Node_regex)
|
|
warning("Regular expression on left of MATCH operator.");
|
|
$$ = node($1, $2, mk_rexp($3));
|
|
}
|
|
| regexp
|
|
{
|
|
$$ = $1;
|
|
if (do_lint && tokstart[0] == '*') {
|
|
/* possible C comment */
|
|
int n = strlen(tokstart) - 1;
|
|
if (tokstart[n] == '*')
|
|
warning("regexp looks like a C comment, but is not");
|
|
}
|
|
}
|
|
| '!' regexp %prec UNARY
|
|
{
|
|
$$ = node(node(make_number(0.0),
|
|
Node_field_spec,
|
|
(NODE *) NULL),
|
|
Node_nomatch,
|
|
$2);
|
|
}
|
|
| exp LEX_IN NAME
|
|
{ $$ = node(variable($3, CAN_FREE, Node_var_array), Node_in_array, $1); }
|
|
| exp RELOP exp
|
|
{
|
|
if (do_lint && $3->type == Node_regex)
|
|
warning("Regular expression on left of comparison.");
|
|
$$ = node($1, $2, $3);
|
|
}
|
|
| exp '<' exp
|
|
{ $$ = node($1, Node_less, $3); }
|
|
| exp '>' exp
|
|
{ $$ = node($1, Node_greater, $3); }
|
|
| exp '?' exp ':' exp
|
|
{ $$ = node($1, Node_cond_exp, node($3, Node_if_branches, $5));}
|
|
| simp_exp
|
|
{ $$ = $1; }
|
|
| exp simp_exp %prec CONCAT_OP
|
|
{ $$ = node($1, Node_concat, $2); }
|
|
;
|
|
|
|
rexp
|
|
: variable ASSIGNOP
|
|
{ want_assign = FALSE; }
|
|
rexp
|
|
{ $$ = node($1, $2, $4); }
|
|
| rexp LEX_AND rexp
|
|
{ $$ = node($1, Node_and, $3); }
|
|
| rexp LEX_OR rexp
|
|
{ $$ = node($1, Node_or, $3); }
|
|
| LEX_GETLINE opt_variable input_redir
|
|
{
|
|
if (do_lint && ! io_allowed && $3 == NULL)
|
|
warning("non-redirected getline undefined inside BEGIN or END action");
|
|
$$ = node($2, Node_K_getline, $3);
|
|
}
|
|
| regexp
|
|
{ $$ = $1; }
|
|
| '!' regexp %prec UNARY
|
|
{ $$ = node((NODE *) NULL, Node_nomatch, $2); }
|
|
| rexp MATCHOP rexp
|
|
{ $$ = node($1, $2, mk_rexp($3)); }
|
|
| rexp LEX_IN NAME
|
|
{ $$ = node(variable($3, CAN_FREE, Node_var_array), Node_in_array, $1); }
|
|
| rexp RELOP rexp
|
|
{ $$ = node($1, $2, $3); }
|
|
| rexp '?' rexp ':' rexp
|
|
{ $$ = node($1, Node_cond_exp, node($3, Node_if_branches, $5));}
|
|
| simp_exp
|
|
{ $$ = $1; }
|
|
| rexp simp_exp %prec CONCAT_OP
|
|
{ $$ = node($1, Node_concat, $2); }
|
|
;
|
|
|
|
simp_exp
|
|
: non_post_simp_exp
|
|
/* Binary operators in order of decreasing precedence. */
|
|
| simp_exp '^' simp_exp
|
|
{ $$ = node($1, Node_exp, $3); }
|
|
| simp_exp '*' simp_exp
|
|
{ $$ = node($1, Node_times, $3); }
|
|
| simp_exp '/' simp_exp
|
|
{ $$ = node($1, Node_quotient, $3); }
|
|
| simp_exp '%' simp_exp
|
|
{ $$ = node($1, Node_mod, $3); }
|
|
| simp_exp '+' simp_exp
|
|
{ $$ = node($1, Node_plus, $3); }
|
|
| simp_exp '-' simp_exp
|
|
{ $$ = node($1, Node_minus, $3); }
|
|
| variable INCREMENT
|
|
{ $$ = node($1, Node_postincrement, (NODE *) NULL); }
|
|
| variable DECREMENT
|
|
{ $$ = node($1, Node_postdecrement, (NODE *) NULL); }
|
|
;
|
|
|
|
non_post_simp_exp
|
|
: '!' simp_exp %prec UNARY
|
|
{ $$ = node($2, Node_not, (NODE *) NULL); }
|
|
| '(' exp r_paren
|
|
{ $$ = $2; }
|
|
| LEX_BUILTIN
|
|
'(' opt_expression_list r_paren
|
|
{ $$ = snode($3, Node_builtin, (int) $1); }
|
|
| LEX_LENGTH '(' opt_expression_list r_paren
|
|
{ $$ = snode($3, Node_builtin, (int) $1); }
|
|
| LEX_LENGTH
|
|
{
|
|
if (do_lint)
|
|
warning("call of `length' without parentheses is not portable");
|
|
$$ = snode((NODE *) NULL, Node_builtin, (int) $1);
|
|
if (do_posix)
|
|
warning("call of `length' without parentheses is deprecated by POSIX");
|
|
}
|
|
| FUNC_CALL '(' opt_expression_list r_paren
|
|
{
|
|
$$ = node($3, Node_func_call, make_string($1, strlen($1)));
|
|
func_use($1, FUNC_USE);
|
|
param_sanity($3);
|
|
free($1);
|
|
}
|
|
| variable
|
|
| INCREMENT variable
|
|
{ $$ = node($2, Node_preincrement, (NODE *) NULL); }
|
|
| DECREMENT variable
|
|
{ $$ = node($2, Node_predecrement, (NODE *) NULL); }
|
|
| YNUMBER
|
|
{ $$ = $1; }
|
|
| YSTRING
|
|
{ $$ = $1; }
|
|
|
|
| '-' simp_exp %prec UNARY
|
|
{
|
|
if ($2->type == Node_val) {
|
|
$2->numbr = -(force_number($2));
|
|
$$ = $2;
|
|
} else
|
|
$$ = node($2, Node_unary_minus, (NODE *) NULL);
|
|
}
|
|
| '+' simp_exp %prec UNARY
|
|
{
|
|
/*
|
|
* was: $$ = $2
|
|
* POSIX semantics: force a conversion to numeric type
|
|
*/
|
|
$$ = node (make_number(0.0), Node_plus, $2);
|
|
}
|
|
;
|
|
|
|
opt_variable
|
|
: /* empty */
|
|
{ $$ = NULL; }
|
|
| variable
|
|
{ $$ = $1; }
|
|
;
|
|
|
|
variable
|
|
: NAME
|
|
{ $$ = variable($1, CAN_FREE, Node_var); }
|
|
| NAME '[' expression_list ']'
|
|
{
|
|
if ($3->rnode == NULL) {
|
|
$$ = node(variable($1, CAN_FREE, Node_var_array), Node_subscript, $3->lnode);
|
|
freenode($3);
|
|
} else
|
|
$$ = node(variable($1, CAN_FREE, Node_var_array), Node_subscript, $3);
|
|
}
|
|
| '$' non_post_simp_exp
|
|
{ $$ = node($2, Node_field_spec, (NODE *) NULL); }
|
|
;
|
|
|
|
l_brace
|
|
: '{' opt_nls
|
|
;
|
|
|
|
r_brace
|
|
: '}' opt_nls { yyerrok; }
|
|
;
|
|
|
|
r_paren
|
|
: ')' { yyerrok; }
|
|
;
|
|
|
|
opt_semi
|
|
: /* empty */
|
|
| semi
|
|
;
|
|
|
|
semi
|
|
: ';' { yyerrok; want_assign = FALSE; }
|
|
;
|
|
|
|
comma : ',' opt_nls { yyerrok; }
|
|
;
|
|
|
|
%%
|
|
|
|
struct token {
|
|
const char *operator; /* text to match */
|
|
NODETYPE value; /* node type */
|
|
int class; /* lexical class */
|
|
unsigned flags; /* # of args. allowed and compatability */
|
|
# define ARGS 0xFF /* 0, 1, 2, 3 args allowed (any combination */
|
|
# define A(n) (1<<(n))
|
|
# define VERSION 0xFF00 /* old awk is zero */
|
|
# define NOT_OLD 0x0100 /* feature not in old awk */
|
|
# define NOT_POSIX 0x0200 /* feature not in POSIX */
|
|
# define GAWKX 0x0400 /* gawk extension */
|
|
# define RESX 0x0800 /* Bell Labs Research extension */
|
|
NODE *(*ptr)(); /* function that implements this keyword */
|
|
};
|
|
|
|
extern NODE
|
|
*do_exp(), *do_getline(), *do_index(), *do_length(),
|
|
*do_sqrt(), *do_log(), *do_sprintf(), *do_substr(),
|
|
*do_split(), *do_system(), *do_int(), *do_close(),
|
|
*do_atan2(), *do_sin(), *do_cos(), *do_rand(),
|
|
*do_srand(), *do_match(), *do_tolower(), *do_toupper(),
|
|
*do_sub(), *do_gsub(), *do_strftime(), *do_systime(),
|
|
*do_fflush();
|
|
|
|
/* Tokentab is sorted ascii ascending order, so it can be binary searched. */
|
|
|
|
static struct token tokentab[] = {
|
|
{"BEGIN", Node_illegal, LEX_BEGIN, 0, 0},
|
|
{"END", Node_illegal, LEX_END, 0, 0},
|
|
#ifdef BITOPS
|
|
{"and", Node_builtin, LEX_BUILTIN, GAWKX|A(2), do_and},
|
|
#endif /* BITOPS */
|
|
{"atan2", Node_builtin, LEX_BUILTIN, NOT_OLD|A(2), do_atan2},
|
|
{"break", Node_K_break, LEX_BREAK, 0, 0},
|
|
{"close", Node_builtin, LEX_BUILTIN, NOT_OLD|A(1), do_close},
|
|
#ifdef BITOPS
|
|
{"compl", Node_builtin, LEX_BUILTIN, GAWKX|A(1), do_compl},
|
|
#endif /* BITOPS */
|
|
{"continue", Node_K_continue, LEX_CONTINUE, 0, 0},
|
|
{"cos", Node_builtin, LEX_BUILTIN, NOT_OLD|A(1), do_cos},
|
|
{"delete", Node_K_delete, LEX_DELETE, NOT_OLD, 0},
|
|
{"do", Node_K_do, LEX_DO, NOT_OLD, 0},
|
|
{"else", Node_illegal, LEX_ELSE, 0, 0},
|
|
{"exit", Node_K_exit, LEX_EXIT, 0, 0},
|
|
{"exp", Node_builtin, LEX_BUILTIN, A(1), do_exp},
|
|
{"fflush", Node_builtin, LEX_BUILTIN, RESX|A(0)|A(1), do_fflush},
|
|
{"for", Node_K_for, LEX_FOR, 0, 0},
|
|
{"func", Node_K_function, LEX_FUNCTION, NOT_POSIX|NOT_OLD, 0},
|
|
{"function", Node_K_function, LEX_FUNCTION, NOT_OLD, 0},
|
|
{"gensub", Node_builtin, LEX_BUILTIN, GAWKX|A(3)|A(4), do_gensub},
|
|
{"getline", Node_K_getline, LEX_GETLINE, NOT_OLD, 0},
|
|
{"gsub", Node_builtin, LEX_BUILTIN, NOT_OLD|A(2)|A(3), do_gsub},
|
|
{"if", Node_K_if, LEX_IF, 0, 0},
|
|
{"in", Node_illegal, LEX_IN, 0, 0},
|
|
{"index", Node_builtin, LEX_BUILTIN, A(2), do_index},
|
|
{"int", Node_builtin, LEX_BUILTIN, A(1), do_int},
|
|
{"length", Node_builtin, LEX_LENGTH, A(0)|A(1), do_length},
|
|
{"log", Node_builtin, LEX_BUILTIN, A(1), do_log},
|
|
#ifdef BITOPS
|
|
{"lshift", Node_builtin, LEX_BUILTIN, GAWKX|A(2), do_lshift},
|
|
#endif /* BITOPS */
|
|
{"match", Node_builtin, LEX_BUILTIN, NOT_OLD|A(2), do_match},
|
|
{"next", Node_K_next, LEX_NEXT, 0, 0},
|
|
{"nextfile", Node_K_nextfile, LEX_NEXTFILE, GAWKX, 0},
|
|
#ifdef BITOPS
|
|
{"or", Node_builtin, LEX_BUILTIN, GAWKX|A(2), do_or},
|
|
#endif /* BITOPS */
|
|
{"print", Node_K_print, LEX_PRINT, 0, 0},
|
|
{"printf", Node_K_printf, LEX_PRINTF, 0, 0},
|
|
{"rand", Node_builtin, LEX_BUILTIN, NOT_OLD|A(0), do_rand},
|
|
{"return", Node_K_return, LEX_RETURN, NOT_OLD, 0},
|
|
#ifdef BITOPS
|
|
{"rshift", Node_builtin, LEX_BUILTIN, GAWKX|A(2), do_rshift},
|
|
#endif /* BITOPS */
|
|
{"sin", Node_builtin, LEX_BUILTIN, NOT_OLD|A(1), do_sin},
|
|
{"split", Node_builtin, LEX_BUILTIN, A(2)|A(3), do_split},
|
|
{"sprintf", Node_builtin, LEX_BUILTIN, 0, do_sprintf},
|
|
{"sqrt", Node_builtin, LEX_BUILTIN, A(1), do_sqrt},
|
|
{"srand", Node_builtin, LEX_BUILTIN, NOT_OLD|A(0)|A(1), do_srand},
|
|
{"strftime", Node_builtin, LEX_BUILTIN, GAWKX|A(0)|A(1)|A(2), do_strftime},
|
|
#ifdef BITOPS
|
|
{"strtonum", Node_builtin, LEX_BUILTIN, GAWKX|A(1), do_strtonum},
|
|
#endif /* BITOPS */
|
|
{"sub", Node_builtin, LEX_BUILTIN, NOT_OLD|A(2)|A(3), do_sub},
|
|
{"substr", Node_builtin, LEX_BUILTIN, A(2)|A(3), do_substr},
|
|
{"system", Node_builtin, LEX_BUILTIN, NOT_OLD|A(1), do_system},
|
|
{"systime", Node_builtin, LEX_BUILTIN, GAWKX|A(0), do_systime},
|
|
{"tolower", Node_builtin, LEX_BUILTIN, NOT_OLD|A(1), do_tolower},
|
|
{"toupper", Node_builtin, LEX_BUILTIN, NOT_OLD|A(1), do_toupper},
|
|
{"while", Node_K_while, LEX_WHILE, 0, 0},
|
|
#ifdef BITOPS
|
|
{"xor", Node_builtin, LEX_BUILTIN, GAWKX|A(2), do_xor},
|
|
#endif /* BITOPS */
|
|
};
|
|
|
|
/* yyerror --- print a syntax error message, show where */
|
|
|
|
#if defined(HAVE_STDARG_H) && defined(__STDC__) && __STDC__
|
|
static void
|
|
yyerror(const char *m, ...)
|
|
#else
|
|
/* VARARGS0 */
|
|
static void
|
|
yyerror(va_alist)
|
|
va_dcl
|
|
#endif
|
|
{
|
|
va_list args;
|
|
const char *mesg = NULL;
|
|
register char *bp, *cp;
|
|
char *scan;
|
|
char buf[120];
|
|
static char end_of_file_line[] = "(END OF FILE)";
|
|
|
|
errcount++;
|
|
/* Find the current line in the input file */
|
|
if (lexptr && lexeme) {
|
|
if (thisline == NULL) {
|
|
cp = lexeme;
|
|
if (*cp == '\n') {
|
|
cp--;
|
|
mesg = "unexpected newline";
|
|
}
|
|
for (; cp != lexptr_begin && *cp != '\n'; --cp)
|
|
continue;
|
|
if (*cp == '\n')
|
|
cp++;
|
|
thisline = cp;
|
|
}
|
|
/* NL isn't guaranteed */
|
|
bp = lexeme;
|
|
while (bp < lexend && *bp && *bp != '\n')
|
|
bp++;
|
|
} else {
|
|
thisline = end_of_file_line;
|
|
bp = thisline + strlen(thisline);
|
|
}
|
|
msg("%.*s", (int) (bp - thisline), thisline);
|
|
bp = buf;
|
|
cp = buf + sizeof(buf) - 24; /* 24 more than longest msg. input */
|
|
if (lexptr != NULL) {
|
|
scan = thisline;
|
|
while (bp < cp && scan < lexeme)
|
|
if (*scan++ == '\t')
|
|
*bp++ = '\t';
|
|
else
|
|
*bp++ = ' ';
|
|
*bp++ = '^';
|
|
*bp++ = ' ';
|
|
}
|
|
#if defined(HAVE_STDARG_H) && defined(__STDC__) && __STDC__
|
|
va_start(args, m);
|
|
if (mesg == NULL)
|
|
mesg = m;
|
|
#else
|
|
va_start(args);
|
|
if (mesg == NULL)
|
|
mesg = va_arg(args, char *);
|
|
#endif
|
|
strcpy(bp, mesg);
|
|
err("", buf, args);
|
|
va_end(args);
|
|
}
|
|
|
|
/* get_src_buf --- read the next buffer of source program */
|
|
|
|
static char *
|
|
get_src_buf()
|
|
{
|
|
static int samefile = FALSE;
|
|
static int nextfile = 0;
|
|
static char *buf = NULL;
|
|
static int fd;
|
|
int n;
|
|
register char *scan;
|
|
static int len = 0;
|
|
static int did_newline = FALSE;
|
|
int newfile;
|
|
struct stat sbuf;
|
|
|
|
# define SLOP 128 /* enough space to hold most source lines */
|
|
|
|
again:
|
|
newfile = FALSE;
|
|
if (nextfile > numfiles)
|
|
return NULL;
|
|
|
|
if (srcfiles[nextfile].stype == CMDLINE) {
|
|
if (len == 0) {
|
|
len = strlen(srcfiles[nextfile].val);
|
|
if (len == 0) {
|
|
/*
|
|
* Yet Another Special case:
|
|
* gawk '' /path/name
|
|
* Sigh.
|
|
*/
|
|
static int warned = FALSE;
|
|
|
|
if (do_lint && ! warned) {
|
|
warned = TRUE;
|
|
warning("empty program text on command line");
|
|
}
|
|
++nextfile;
|
|
goto again;
|
|
}
|
|
sourceline = 1;
|
|
lexptr = lexptr_begin = srcfiles[nextfile].val;
|
|
lexend = lexptr + len;
|
|
} else if (! did_newline && *(lexptr-1) != '\n') {
|
|
/*
|
|
* The following goop is to ensure that the source
|
|
* ends with a newline and that the entire current
|
|
* line is available for error messages.
|
|
*/
|
|
int offset;
|
|
|
|
did_newline = TRUE;
|
|
offset = lexptr - lexeme;
|
|
for (scan = lexeme; scan > lexptr_begin; scan--)
|
|
if (*scan == '\n') {
|
|
scan++;
|
|
break;
|
|
}
|
|
len = lexptr - scan;
|
|
emalloc(buf, char *, len+1, "get_src_buf");
|
|
memcpy(buf, scan, len);
|
|
thisline = buf;
|
|
lexptr = buf + len;
|
|
*lexptr = '\n';
|
|
lexeme = lexptr - offset;
|
|
lexptr_begin = buf;
|
|
lexend = lexptr + 1;
|
|
} else {
|
|
len = 0;
|
|
lexeme = lexptr = lexptr_begin = NULL;
|
|
}
|
|
if (lexptr == NULL && ++nextfile <= numfiles)
|
|
goto again;
|
|
return lexptr;
|
|
}
|
|
if (! samefile) {
|
|
source = srcfiles[nextfile].val;
|
|
if (source == NULL) {
|
|
if (buf != NULL) {
|
|
free(buf);
|
|
buf = NULL;
|
|
}
|
|
len = 0;
|
|
return lexeme = lexptr = lexptr_begin = NULL;
|
|
}
|
|
fd = pathopen(source);
|
|
if (fd <= INVALID_HANDLE) {
|
|
char *in;
|
|
|
|
/* suppress file name and line no. in error mesg */
|
|
in = source;
|
|
source = NULL;
|
|
fatal("can't open source file \"%s\" for reading (%s)",
|
|
in, strerror(errno));
|
|
}
|
|
len = optimal_bufsize(fd, & sbuf);
|
|
newfile = TRUE;
|
|
if (buf != NULL)
|
|
free(buf);
|
|
emalloc(buf, char *, len + SLOP, "get_src_buf");
|
|
lexptr_begin = buf + SLOP;
|
|
samefile = TRUE;
|
|
sourceline = 1;
|
|
} else {
|
|
/*
|
|
* Here, we retain the current source line (up to length SLOP)
|
|
* in the beginning of the buffer that was overallocated above
|
|
*/
|
|
int offset;
|
|
int linelen;
|
|
|
|
offset = lexptr - lexeme;
|
|
for (scan = lexeme; scan > lexptr_begin; scan--)
|
|
if (*scan == '\n') {
|
|
scan++;
|
|
break;
|
|
}
|
|
linelen = lexptr - scan;
|
|
if (linelen > SLOP)
|
|
linelen = SLOP;
|
|
thisline = buf + SLOP - linelen;
|
|
memcpy(thisline, scan, linelen);
|
|
lexeme = buf + SLOP - offset;
|
|
lexptr_begin = thisline;
|
|
}
|
|
n = read(fd, buf + SLOP, len);
|
|
if (n == -1)
|
|
fatal("can't read sourcefile \"%s\" (%s)",
|
|
source, strerror(errno));
|
|
if (n == 0) {
|
|
if (newfile) {
|
|
static int warned = FALSE;
|
|
|
|
if (do_lint && ! warned) {
|
|
warned = TRUE;
|
|
warning("source file `%s' is empty", source);
|
|
}
|
|
}
|
|
close(fd);
|
|
samefile = FALSE;
|
|
nextfile++;
|
|
if (lexeme)
|
|
*lexeme = '\0';
|
|
len = 0;
|
|
goto again;
|
|
}
|
|
lexptr = buf + SLOP;
|
|
lexend = lexptr + n;
|
|
return buf;
|
|
}
|
|
|
|
/* tokadd --- add a character to the token buffer */
|
|
|
|
#define tokadd(x) (*tok++ = (x), tok == tokend ? tokexpand() : tok)
|
|
|
|
/* tokexpand --- grow the token buffer */
|
|
|
|
char *
|
|
tokexpand()
|
|
{
|
|
static int toksize = 60;
|
|
int tokoffset;
|
|
|
|
tokoffset = tok - tokstart;
|
|
toksize *= 2;
|
|
if (tokstart != NULL)
|
|
erealloc(tokstart, char *, toksize, "tokexpand");
|
|
else
|
|
emalloc(tokstart, char *, toksize, "tokexpand");
|
|
tokend = tokstart + toksize;
|
|
tok = tokstart + tokoffset;
|
|
return tok;
|
|
}
|
|
|
|
/* nextc --- get the next input character */
|
|
|
|
#if DEBUG
|
|
int
|
|
nextc()
|
|
{
|
|
int c;
|
|
|
|
if (lexptr && lexptr < lexend)
|
|
c = *lexptr++;
|
|
else if (get_src_buf())
|
|
c = *lexptr++;
|
|
else
|
|
c = EOF;
|
|
|
|
return c;
|
|
}
|
|
#else
|
|
#define nextc() ((lexptr && lexptr < lexend) ? \
|
|
*lexptr++ : \
|
|
(get_src_buf() ? *lexptr++ : EOF) \
|
|
)
|
|
#endif
|
|
|
|
/* pushback --- push a character back on the input */
|
|
|
|
#define pushback() (lexptr && lexptr > lexptr_begin ? lexptr-- : lexptr)
|
|
|
|
/* allow_newline --- allow newline after &&, ||, ? and : */
|
|
|
|
static void
|
|
allow_newline()
|
|
{
|
|
int c;
|
|
|
|
for (;;) {
|
|
c = nextc();
|
|
if (c == EOF)
|
|
break;
|
|
if (c == '#') {
|
|
while ((c = nextc()) != '\n' && c != EOF)
|
|
continue;
|
|
if (c == EOF)
|
|
break;
|
|
}
|
|
if (c == '\n')
|
|
sourceline++;
|
|
if (! isspace(c)) {
|
|
pushback();
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* yylex --- Read the input and turn it into tokens. */
|
|
|
|
static int
|
|
yylex()
|
|
{
|
|
register int c, c1;
|
|
int seen_e = FALSE; /* These are for numbers */
|
|
int seen_point = FALSE;
|
|
int esc_seen; /* for literal strings */
|
|
int low, mid, high;
|
|
static int did_newline = FALSE;
|
|
char *tokkey;
|
|
static int lasttok = 0, eof_warned = FALSE;
|
|
int inhex = FALSE;
|
|
|
|
if (nextc() == EOF) {
|
|
if (lasttok != NEWLINE) {
|
|
lasttok = NEWLINE;
|
|
if (do_lint && ! eof_warned) {
|
|
warning("source file does not end in newline");
|
|
eof_warned = TRUE;
|
|
}
|
|
return NEWLINE; /* fake it */
|
|
}
|
|
return 0;
|
|
}
|
|
pushback();
|
|
#ifdef OS2
|
|
/*
|
|
* added for OS/2's extproc feature of cmd.exe
|
|
* (like #! in BSD sh)
|
|
*/
|
|
if (strncasecmp(lexptr, "extproc ", 8) == 0) {
|
|
while (*lexptr && *lexptr != '\n')
|
|
lexptr++;
|
|
}
|
|
#endif
|
|
lexeme = lexptr;
|
|
thisline = NULL;
|
|
if (want_regexp) {
|
|
int in_brack = 0; /* count brackets, [[:alnum:]] allowed */
|
|
/*
|
|
* Counting brackets is non-trivial. [[] is ok,
|
|
* and so is [\]], with a point being that /[/]/ as a regexp
|
|
* constant has to work.
|
|
*
|
|
* Do not count [ or ] if either one is preceded by a \.
|
|
* A `[' should be counted if
|
|
* a) it is the first one so far (in_brack == 0)
|
|
* b) it is the `[' in `[:'
|
|
* A ']' should be counted if not preceded by a \, since
|
|
* it is either closing `:]' or just a plain list.
|
|
* According to POSIX, []] is how you put a ] into a set.
|
|
* Try to handle that too.
|
|
*
|
|
* The code for \ handles \[ and \].
|
|
*/
|
|
|
|
want_regexp = FALSE;
|
|
tok = tokstart;
|
|
for (;;) {
|
|
c = nextc();
|
|
switch (c) {
|
|
case '[':
|
|
/* one day check for `.' and `=' too */
|
|
if ((c1 = nextc()) == ':' || in_brack == 0)
|
|
in_brack++;
|
|
pushback();
|
|
break;
|
|
case ']':
|
|
if (tokstart[0] == '['
|
|
&& (tok == tokstart + 1
|
|
|| (tok == tokstart + 2
|
|
&& tokstart[1] == '^')))
|
|
/* do nothing */;
|
|
else
|
|
in_brack--;
|
|
break;
|
|
case '\\':
|
|
if ((c = nextc()) == EOF) {
|
|
yyerror("unterminated regexp ends with \\ at end of file");
|
|
return lasttok = REGEXP; /* kludge */
|
|
} else if (c == '\n') {
|
|
sourceline++;
|
|
continue;
|
|
} else {
|
|
tokadd('\\');
|
|
tokadd(c);
|
|
continue;
|
|
}
|
|
break;
|
|
case '/': /* end of the regexp */
|
|
if (in_brack > 0)
|
|
break;
|
|
|
|
pushback();
|
|
tokadd('\0');
|
|
yylval.sval = tokstart;
|
|
return lasttok = REGEXP;
|
|
case '\n':
|
|
pushback();
|
|
yyerror("unterminated regexp");
|
|
return lasttok = REGEXP; /* kludge */
|
|
case EOF:
|
|
yyerror("unterminated regexp at end of file");
|
|
return lasttok = REGEXP; /* kludge */
|
|
}
|
|
tokadd(c);
|
|
}
|
|
}
|
|
retry:
|
|
while ((c = nextc()) == ' ' || c == '\t')
|
|
continue;
|
|
|
|
lexeme = lexptr ? lexptr - 1 : lexptr;
|
|
thisline = NULL;
|
|
tok = tokstart;
|
|
yylval.nodetypeval = Node_illegal;
|
|
|
|
switch (c) {
|
|
case EOF:
|
|
if (lasttok != NEWLINE) {
|
|
lasttok = NEWLINE;
|
|
if (do_lint && ! eof_warned) {
|
|
warning("source file does not end in newline");
|
|
eof_warned = TRUE;
|
|
}
|
|
return NEWLINE; /* fake it */
|
|
}
|
|
return 0;
|
|
|
|
case '\n':
|
|
sourceline++;
|
|
return lasttok = NEWLINE;
|
|
|
|
case '#': /* it's a comment */
|
|
while ((c = nextc()) != '\n') {
|
|
if (c == EOF) {
|
|
if (lasttok != NEWLINE) {
|
|
lasttok = NEWLINE;
|
|
if (do_lint && ! eof_warned) {
|
|
warning(
|
|
"source file does not end in newline");
|
|
eof_warned = TRUE;
|
|
}
|
|
return NEWLINE; /* fake it */
|
|
}
|
|
return 0;
|
|
}
|
|
}
|
|
sourceline++;
|
|
return lasttok = NEWLINE;
|
|
|
|
case '\\':
|
|
#ifdef RELAXED_CONTINUATION
|
|
/*
|
|
* This code puports to allow comments and/or whitespace
|
|
* after the `\' at the end of a line used for continuation.
|
|
* Use it at your own risk. We think it's a bad idea, which
|
|
* is why it's not on by default.
|
|
*/
|
|
if (! do_traditional) {
|
|
/* strip trailing white-space and/or comment */
|
|
while ((c = nextc()) == ' ' || c == '\t')
|
|
continue;
|
|
if (c == '#') {
|
|
if (do_lint)
|
|
warning(
|
|
"use of `\\ #...' line continuation is not portable");
|
|
while ((c = nextc()) != '\n')
|
|
if (c == EOF)
|
|
break;
|
|
}
|
|
pushback();
|
|
}
|
|
#endif /* RELAXED_CONTINUATION */
|
|
if (nextc() == '\n') {
|
|
sourceline++;
|
|
goto retry;
|
|
} else {
|
|
yyerror("backslash not last character on line");
|
|
exit(1);
|
|
}
|
|
break;
|
|
|
|
case '$':
|
|
want_assign = TRUE;
|
|
return lasttok = '$';
|
|
|
|
case ':':
|
|
case '?':
|
|
allow_newline();
|
|
/* fall through */
|
|
case ')':
|
|
case ']':
|
|
case '(':
|
|
case '[':
|
|
case ';':
|
|
case '{':
|
|
case ',':
|
|
return lasttok = c;
|
|
|
|
case '*':
|
|
if ((c = nextc()) == '=') {
|
|
yylval.nodetypeval = Node_assign_times;
|
|
return lasttok = ASSIGNOP;
|
|
} else if (do_posix) {
|
|
pushback();
|
|
return lasttok = '*';
|
|
} else if (c == '*') {
|
|
/* make ** and **= aliases for ^ and ^= */
|
|
static int did_warn_op = FALSE, did_warn_assgn = FALSE;
|
|
|
|
if (nextc() == '=') {
|
|
if (do_lint && ! did_warn_assgn) {
|
|
did_warn_assgn = TRUE;
|
|
warning("**= is not allowed by POSIX");
|
|
warning("operator `**=' is not supported in old awk");
|
|
}
|
|
yylval.nodetypeval = Node_assign_exp;
|
|
return ASSIGNOP;
|
|
} else {
|
|
pushback();
|
|
if (do_lint && ! did_warn_op) {
|
|
did_warn_op = TRUE;
|
|
warning("** is not allowed by POSIX");
|
|
warning("operator `**' is not supported in old awk");
|
|
}
|
|
return lasttok = '^';
|
|
}
|
|
}
|
|
pushback();
|
|
return lasttok = '*';
|
|
|
|
case '/':
|
|
if (want_assign) {
|
|
if (nextc() == '=') {
|
|
yylval.nodetypeval = Node_assign_quotient;
|
|
return lasttok = ASSIGNOP;
|
|
}
|
|
pushback();
|
|
}
|
|
return lasttok = '/';
|
|
|
|
case '%':
|
|
if (nextc() == '=') {
|
|
yylval.nodetypeval = Node_assign_mod;
|
|
return lasttok = ASSIGNOP;
|
|
}
|
|
pushback();
|
|
return lasttok = '%';
|
|
|
|
case '^':
|
|
{
|
|
static int did_warn_op = FALSE, did_warn_assgn = FALSE;
|
|
|
|
if (nextc() == '=') {
|
|
if (do_lint && ! did_warn_assgn) {
|
|
did_warn_assgn = TRUE;
|
|
warning("operator `^=' is not supported in old awk");
|
|
}
|
|
yylval.nodetypeval = Node_assign_exp;
|
|
return lasttok = ASSIGNOP;
|
|
}
|
|
pushback();
|
|
if (do_lint && ! did_warn_op) {
|
|
did_warn_op = TRUE;
|
|
warning("operator `^' is not supported in old awk");
|
|
}
|
|
return lasttok = '^';
|
|
}
|
|
|
|
case '+':
|
|
if ((c = nextc()) == '=') {
|
|
yylval.nodetypeval = Node_assign_plus;
|
|
return lasttok = ASSIGNOP;
|
|
}
|
|
if (c == '+')
|
|
return lasttok = INCREMENT;
|
|
pushback();
|
|
return lasttok = '+';
|
|
|
|
case '!':
|
|
if ((c = nextc()) == '=') {
|
|
yylval.nodetypeval = Node_notequal;
|
|
return lasttok = RELOP;
|
|
}
|
|
if (c == '~') {
|
|
yylval.nodetypeval = Node_nomatch;
|
|
want_assign = FALSE;
|
|
return lasttok = MATCHOP;
|
|
}
|
|
pushback();
|
|
return lasttok = '!';
|
|
|
|
case '<':
|
|
if (nextc() == '=') {
|
|
yylval.nodetypeval = Node_leq;
|
|
return lasttok = RELOP;
|
|
}
|
|
yylval.nodetypeval = Node_less;
|
|
pushback();
|
|
return lasttok = '<';
|
|
|
|
case '=':
|
|
if (nextc() == '=') {
|
|
yylval.nodetypeval = Node_equal;
|
|
return lasttok = RELOP;
|
|
}
|
|
yylval.nodetypeval = Node_assign;
|
|
pushback();
|
|
return lasttok = ASSIGNOP;
|
|
|
|
case '>':
|
|
if ((c = nextc()) == '=') {
|
|
yylval.nodetypeval = Node_geq;
|
|
return lasttok = RELOP;
|
|
} else if (c == '>') {
|
|
yylval.nodetypeval = Node_redirect_append;
|
|
return lasttok = APPEND_OP;
|
|
}
|
|
yylval.nodetypeval = Node_greater;
|
|
pushback();
|
|
return lasttok = '>';
|
|
|
|
case '~':
|
|
yylval.nodetypeval = Node_match;
|
|
want_assign = FALSE;
|
|
return lasttok = MATCHOP;
|
|
|
|
case '}':
|
|
/*
|
|
* Added did newline stuff. Easier than
|
|
* hacking the grammar.
|
|
*/
|
|
if (did_newline) {
|
|
did_newline = FALSE;
|
|
return lasttok = c;
|
|
}
|
|
did_newline++;
|
|
--lexptr; /* pick up } next time */
|
|
return lasttok = NEWLINE;
|
|
|
|
case '"':
|
|
esc_seen = FALSE;
|
|
while ((c = nextc()) != '"') {
|
|
if (c == '\n') {
|
|
pushback();
|
|
yyerror("unterminated string");
|
|
exit(1);
|
|
}
|
|
if (c == '\\') {
|
|
c = nextc();
|
|
if (c == '\n') {
|
|
sourceline++;
|
|
continue;
|
|
}
|
|
esc_seen = TRUE;
|
|
tokadd('\\');
|
|
}
|
|
if (c == EOF) {
|
|
pushback();
|
|
yyerror("unterminated string");
|
|
exit(1);
|
|
}
|
|
tokadd(c);
|
|
}
|
|
yylval.nodeval = make_str_node(tokstart,
|
|
tok - tokstart, esc_seen ? SCAN : 0);
|
|
yylval.nodeval->flags |= PERM;
|
|
return lasttok = YSTRING;
|
|
|
|
case '-':
|
|
if ((c = nextc()) == '=') {
|
|
yylval.nodetypeval = Node_assign_minus;
|
|
return lasttok = ASSIGNOP;
|
|
}
|
|
if (c == '-')
|
|
return lasttok = DECREMENT;
|
|
pushback();
|
|
return lasttok = '-';
|
|
|
|
case '.':
|
|
c = nextc();
|
|
pushback();
|
|
if (! isdigit(c))
|
|
return lasttok = '.';
|
|
else
|
|
c = '.';
|
|
/* FALL THROUGH */
|
|
case '0':
|
|
case '1':
|
|
case '2':
|
|
case '3':
|
|
case '4':
|
|
case '5':
|
|
case '6':
|
|
case '7':
|
|
case '8':
|
|
case '9':
|
|
/* It's a number */
|
|
for (;;) {
|
|
int gotnumber = FALSE;
|
|
|
|
tokadd(c);
|
|
switch (c) {
|
|
#ifdef BITOPS
|
|
case 'x':
|
|
case 'X':
|
|
if (do_traditional)
|
|
goto done;
|
|
if (tok == tokstart + 2)
|
|
inhex = TRUE;
|
|
break;
|
|
#endif /* BITOTS */
|
|
case '.':
|
|
if (seen_point) {
|
|
gotnumber = TRUE;
|
|
break;
|
|
}
|
|
seen_point = TRUE;
|
|
break;
|
|
case 'e':
|
|
case 'E':
|
|
if (inhex)
|
|
break;
|
|
if (seen_e) {
|
|
gotnumber = TRUE;
|
|
break;
|
|
}
|
|
seen_e = TRUE;
|
|
if ((c = nextc()) == '-' || c == '+')
|
|
tokadd(c);
|
|
else
|
|
pushback();
|
|
break;
|
|
#ifdef BITOPS
|
|
case 'a':
|
|
case 'A':
|
|
case 'b':
|
|
case 'B':
|
|
case 'c':
|
|
case 'C':
|
|
case 'D':
|
|
case 'd':
|
|
case 'f':
|
|
case 'F':
|
|
if (do_traditional || ! inhex)
|
|
goto done;
|
|
/* fall through */
|
|
#endif
|
|
case '0':
|
|
case '1':
|
|
case '2':
|
|
case '3':
|
|
case '4':
|
|
case '5':
|
|
case '6':
|
|
case '7':
|
|
case '8':
|
|
case '9':
|
|
break;
|
|
default:
|
|
done:
|
|
gotnumber = TRUE;
|
|
}
|
|
if (gotnumber)
|
|
break;
|
|
c = nextc();
|
|
}
|
|
if (c != EOF)
|
|
pushback();
|
|
else if (do_lint && ! eof_warned) {
|
|
warning("source file does not end in newline");
|
|
eof_warned = TRUE;
|
|
}
|
|
tokadd('\0');
|
|
#ifdef BITOPS
|
|
if (! do_traditional && isnondecimal(tokstart))
|
|
yylval.nodeval = make_number(nondec2awknum(tokstart, strlen(tokstart)));
|
|
else
|
|
#endif /* BITOPS */
|
|
yylval.nodeval = make_number(atof(tokstart));
|
|
yylval.nodeval->flags |= PERM;
|
|
return lasttok = YNUMBER;
|
|
|
|
case '&':
|
|
if ((c = nextc()) == '&') {
|
|
yylval.nodetypeval = Node_and;
|
|
allow_newline();
|
|
want_assign = FALSE;
|
|
return lasttok = LEX_AND;
|
|
}
|
|
pushback();
|
|
return lasttok = '&';
|
|
|
|
case '|':
|
|
if ((c = nextc()) == '|') {
|
|
yylval.nodetypeval = Node_or;
|
|
allow_newline();
|
|
want_assign = FALSE;
|
|
return lasttok = LEX_OR;
|
|
}
|
|
pushback();
|
|
return lasttok = '|';
|
|
}
|
|
|
|
if (c != '_' && ! isalpha(c)) {
|
|
yyerror("Invalid char '%c' in expression\n", c);
|
|
exit(1);
|
|
}
|
|
|
|
/* it's some type of name-type-thing. Find its length. */
|
|
tok = tokstart;
|
|
while (is_identchar(c)) {
|
|
tokadd(c);
|
|
c = nextc();
|
|
}
|
|
tokadd('\0');
|
|
emalloc(tokkey, char *, tok - tokstart, "yylex");
|
|
memcpy(tokkey, tokstart, tok - tokstart);
|
|
if (c != EOF)
|
|
pushback();
|
|
else if (do_lint && ! eof_warned) {
|
|
warning("source file does not end in newline");
|
|
eof_warned = TRUE;
|
|
}
|
|
|
|
/* See if it is a special token. */
|
|
low = 0;
|
|
high = (sizeof(tokentab) / sizeof(tokentab[0])) - 1;
|
|
while (low <= high) {
|
|
int i;
|
|
|
|
mid = (low + high) / 2;
|
|
c = *tokstart - tokentab[mid].operator[0];
|
|
i = c ? c : strcmp(tokstart, tokentab[mid].operator);
|
|
|
|
if (i < 0) /* token < mid */
|
|
high = mid - 1;
|
|
else if (i > 0) /* token > mid */
|
|
low = mid + 1;
|
|
else {
|
|
if (do_lint) {
|
|
if (tokentab[mid].flags & GAWKX)
|
|
warning("%s() is a gawk extension",
|
|
tokentab[mid].operator);
|
|
if (tokentab[mid].flags & RESX)
|
|
warning("%s() is a Bell Labs extension",
|
|
tokentab[mid].operator);
|
|
if (tokentab[mid].flags & NOT_POSIX)
|
|
warning("POSIX does not allow %s",
|
|
tokentab[mid].operator);
|
|
}
|
|
if (do_lint_old && (tokentab[mid].flags & NOT_OLD))
|
|
warning("%s is not supported in old awk",
|
|
tokentab[mid].operator);
|
|
if ((do_traditional && (tokentab[mid].flags & GAWKX))
|
|
|| (do_posix && (tokentab[mid].flags & NOT_POSIX)))
|
|
break;
|
|
if (tokentab[mid].class == LEX_BUILTIN
|
|
|| tokentab[mid].class == LEX_LENGTH
|
|
)
|
|
yylval.lval = mid;
|
|
else
|
|
yylval.nodetypeval = tokentab[mid].value;
|
|
|
|
free(tokkey);
|
|
return lasttok = tokentab[mid].class;
|
|
}
|
|
}
|
|
|
|
yylval.sval = tokkey;
|
|
if (*lexptr == '(')
|
|
return lasttok = FUNC_CALL;
|
|
else {
|
|
want_assign = TRUE;
|
|
return lasttok = NAME;
|
|
}
|
|
}
|
|
|
|
/* node_common --- common code for allocating a new node */
|
|
|
|
static NODE *
|
|
node_common(op)
|
|
NODETYPE op;
|
|
{
|
|
register NODE *r;
|
|
|
|
getnode(r);
|
|
r->type = op;
|
|
r->flags = MALLOC;
|
|
/* if lookahead is NL, lineno is 1 too high */
|
|
if (lexeme && *lexeme == '\n')
|
|
r->source_line = sourceline - 1;
|
|
else
|
|
r->source_line = sourceline;
|
|
r->source_file = source;
|
|
return r;
|
|
}
|
|
|
|
/* node --- allocates a node with defined lnode and rnode. */
|
|
|
|
NODE *
|
|
node(left, op, right)
|
|
NODE *left, *right;
|
|
NODETYPE op;
|
|
{
|
|
register NODE *r;
|
|
|
|
r = node_common(op);
|
|
r->lnode = left;
|
|
r->rnode = right;
|
|
return r;
|
|
}
|
|
|
|
/* snode --- allocate a node with defined subnode and proc for builtin
|
|
functions. Checks for arg. count and supplies defaults where
|
|
possible. */
|
|
|
|
static NODE *
|
|
snode(subn, op, idx)
|
|
NODETYPE op;
|
|
int idx;
|
|
NODE *subn;
|
|
{
|
|
register NODE *r;
|
|
register NODE *n;
|
|
int nexp = 0;
|
|
int args_allowed;
|
|
|
|
r = node_common(op);
|
|
|
|
/* traverse expression list to see how many args. given */
|
|
for (n = subn; n != NULL; n = n->rnode) {
|
|
nexp++;
|
|
if (nexp > 3)
|
|
break;
|
|
}
|
|
|
|
/* check against how many args. are allowed for this builtin */
|
|
args_allowed = tokentab[idx].flags & ARGS;
|
|
if (args_allowed && (args_allowed & A(nexp)) == 0)
|
|
fatal("%s() cannot have %d argument%c",
|
|
tokentab[idx].operator, nexp, nexp == 1 ? ' ' : 's');
|
|
|
|
r->proc = tokentab[idx].ptr;
|
|
|
|
/* special case processing for a few builtins */
|
|
/*
|
|
* FIXME: go through these to make sure that everything done
|
|
* here is really right. Move anything that's not into
|
|
* the corresponding routine.
|
|
*/
|
|
if (nexp == 0 && r->proc == do_length) {
|
|
subn = node(node(make_number(0.0), Node_field_spec, (NODE *) NULL),
|
|
Node_expression_list,
|
|
(NODE *) NULL);
|
|
} else if (r->proc == do_match) {
|
|
if (subn->rnode->lnode->type != Node_regex)
|
|
subn->rnode->lnode = mk_rexp(subn->rnode->lnode);
|
|
} else if (r->proc == do_sub || r->proc == do_gsub) {
|
|
if (subn->lnode->type != Node_regex)
|
|
subn->lnode = mk_rexp(subn->lnode);
|
|
if (nexp == 2)
|
|
append_right(subn, node(node(make_number(0.0),
|
|
Node_field_spec,
|
|
(NODE *) NULL),
|
|
Node_expression_list,
|
|
(NODE *) NULL));
|
|
else if (subn->rnode->rnode->lnode->type == Node_val) {
|
|
if (do_lint)
|
|
warning("string literal as last arg of substitute");
|
|
} else if (! isassignable(subn->rnode->rnode->lnode))
|
|
yyerror("%s third parameter is not a changeable object",
|
|
r->proc == do_sub ? "sub" : "gsub");
|
|
} else if (r->proc == do_gensub) {
|
|
if (subn->lnode->type != Node_regex)
|
|
subn->lnode = mk_rexp(subn->lnode);
|
|
if (nexp == 3)
|
|
append_right(subn, node(node(make_number(0.0),
|
|
Node_field_spec,
|
|
(NODE *) NULL),
|
|
Node_expression_list,
|
|
(NODE *) NULL));
|
|
} else if (r->proc == do_split) {
|
|
if (nexp == 2)
|
|
append_right(subn,
|
|
node(FS_node, Node_expression_list, (NODE *) NULL));
|
|
n = subn->rnode->rnode->lnode;
|
|
if (n->type != Node_regex)
|
|
subn->rnode->rnode->lnode = mk_rexp(n);
|
|
if (nexp == 2)
|
|
subn->rnode->rnode->lnode->re_flags |= FS_DFLT;
|
|
}
|
|
|
|
r->subnode = subn;
|
|
return r;
|
|
}
|
|
|
|
/*
|
|
* mkrangenode:
|
|
* This allocates a Node_line_range node with defined condpair and
|
|
* zeroes the trigger word to avoid the temptation of assuming that calling
|
|
* 'node( foo, Node_line_range, 0)' will properly initialize 'triggered'.
|
|
* Otherwise like node().
|
|
*/
|
|
|
|
static NODE *
|
|
mkrangenode(cpair)
|
|
NODE *cpair;
|
|
{
|
|
register NODE *r;
|
|
|
|
getnode(r);
|
|
r->type = Node_line_range;
|
|
r->condpair = cpair;
|
|
r->triggered = FALSE;
|
|
return r;
|
|
}
|
|
|
|
/* make_for_loop --- build a for loop */
|
|
|
|
static NODE *
|
|
make_for_loop(init, cond, incr)
|
|
NODE *init, *cond, *incr;
|
|
{
|
|
register FOR_LOOP_HEADER *r;
|
|
NODE *n;
|
|
|
|
emalloc(r, FOR_LOOP_HEADER *, sizeof(FOR_LOOP_HEADER), "make_for_loop");
|
|
getnode(n);
|
|
n->type = Node_illegal;
|
|
r->init = init;
|
|
r->cond = cond;
|
|
r->incr = incr;
|
|
n->sub.nodep.r.hd = r;
|
|
return n;
|
|
}
|
|
|
|
/* dup_parms --- return TRUE if there are duplicate parameters */
|
|
|
|
static int
|
|
dup_parms(func)
|
|
NODE *func;
|
|
{
|
|
register NODE *np;
|
|
char *fname, **names;
|
|
int count, i, j, dups;
|
|
NODE *params;
|
|
|
|
if (func == NULL) /* error earlier */
|
|
return TRUE;
|
|
|
|
fname = func->param;
|
|
count = func->param_cnt;
|
|
params = func->rnode;
|
|
|
|
if (count == 0) /* no args, no problem */
|
|
return FALSE;
|
|
|
|
if (params == NULL) /* error earlier */
|
|
return TRUE;
|
|
|
|
emalloc(names, char **, count * sizeof(char *), "dup_parms");
|
|
|
|
i = 0;
|
|
for (np = params; np != NULL; np = np->rnode) {
|
|
if (np->param == NULL) { /* error earlier, give up, go home */
|
|
free(names);
|
|
return TRUE;
|
|
}
|
|
names[i++] = np->param;
|
|
}
|
|
|
|
dups = 0;
|
|
for (i = 1; i < count; i++) {
|
|
for (j = 0; j < i; j++) {
|
|
if (strcmp(names[i], names[j]) == 0) {
|
|
dups++;
|
|
error(
|
|
"function `%s': parameter #%d, `%s', duplicates parameter #%d",
|
|
fname, i+1, names[j], j+1);
|
|
}
|
|
}
|
|
}
|
|
|
|
free(names);
|
|
return (dups > 0 ? TRUE : FALSE);
|
|
}
|
|
|
|
/*
|
|
* install:
|
|
* Install a name in the symbol table, even if it is already there.
|
|
* Caller must check against redefinition if that is desired.
|
|
*/
|
|
|
|
NODE *
|
|
install(name, value)
|
|
char *name;
|
|
NODE *value;
|
|
{
|
|
register NODE *hp;
|
|
register size_t len;
|
|
register int bucket;
|
|
|
|
len = strlen(name);
|
|
bucket = hash(name, len, (unsigned long) HASHSIZE);
|
|
getnode(hp);
|
|
hp->type = Node_hashnode;
|
|
hp->hnext = variables[bucket];
|
|
variables[bucket] = hp;
|
|
hp->hlength = len;
|
|
hp->hvalue = value;
|
|
hp->hname = name;
|
|
hp->hvalue->vname = name;
|
|
return hp->hvalue;
|
|
}
|
|
|
|
/* lookup --- find the most recent hash node for name installed by install */
|
|
|
|
NODE *
|
|
lookup(name)
|
|
const char *name;
|
|
{
|
|
register NODE *bucket;
|
|
register size_t len;
|
|
|
|
len = strlen(name);
|
|
for (bucket = variables[hash(name, len, (unsigned long) HASHSIZE)];
|
|
bucket != NULL; bucket = bucket->hnext)
|
|
if (bucket->hlength == len && STREQN(bucket->hname, name, len))
|
|
return bucket->hvalue;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* append_right:
|
|
* Add new to the rightmost branch of LIST. This uses n^2 time, so we make
|
|
* a simple attempt at optimizing it.
|
|
*/
|
|
|
|
static NODE *
|
|
append_right(list, new)
|
|
NODE *list, *new;
|
|
{
|
|
register NODE *oldlist;
|
|
static NODE *savefront = NULL, *savetail = NULL;
|
|
|
|
oldlist = list;
|
|
if (savefront == oldlist) {
|
|
savetail = savetail->rnode = new;
|
|
return oldlist;
|
|
} else
|
|
savefront = oldlist;
|
|
while (list->rnode != NULL)
|
|
list = list->rnode;
|
|
savetail = list->rnode = new;
|
|
return oldlist;
|
|
}
|
|
|
|
/*
|
|
* func_install:
|
|
* check if name is already installed; if so, it had better have Null value,
|
|
* in which case def is added as the value. Otherwise, install name with def
|
|
* as value.
|
|
*/
|
|
|
|
static void
|
|
func_install(params, def)
|
|
NODE *params;
|
|
NODE *def;
|
|
{
|
|
NODE *r;
|
|
|
|
pop_params(params->rnode);
|
|
pop_var(params, FALSE);
|
|
r = lookup(params->param);
|
|
if (r != NULL) {
|
|
fatal("function name `%s' previously defined", params->param);
|
|
} else
|
|
(void) install(params->param, node(params, Node_func, def));
|
|
|
|
func_use(params->param, FUNC_DEFINE);
|
|
}
|
|
|
|
/* pop_var --- remove a variable from the symbol table */
|
|
|
|
static void
|
|
pop_var(np, freeit)
|
|
NODE *np;
|
|
int freeit;
|
|
{
|
|
register NODE *bucket, **save;
|
|
register size_t len;
|
|
char *name;
|
|
|
|
name = np->param;
|
|
len = strlen(name);
|
|
save = &(variables[hash(name, len, (unsigned long) HASHSIZE)]);
|
|
for (bucket = *save; bucket != NULL; bucket = bucket->hnext) {
|
|
if (len == bucket->hlength && STREQN(bucket->hname, name, len)) {
|
|
*save = bucket->hnext;
|
|
freenode(bucket);
|
|
if (freeit)
|
|
free(np->param);
|
|
return;
|
|
}
|
|
save = &(bucket->hnext);
|
|
}
|
|
}
|
|
|
|
/* pop_params --- remove list of function parameters from symbol table */
|
|
|
|
/*
|
|
* pop parameters out of the symbol table. do this in reverse order to
|
|
* avoid reading freed memory if there were duplicated parameters.
|
|
*/
|
|
static void
|
|
pop_params(params)
|
|
NODE *params;
|
|
{
|
|
if (params == NULL)
|
|
return;
|
|
pop_params(params->rnode);
|
|
pop_var(params, TRUE);
|
|
}
|
|
|
|
/* make_param --- make NAME into a function parameter */
|
|
|
|
static NODE *
|
|
make_param(name)
|
|
char *name;
|
|
{
|
|
NODE *r;
|
|
|
|
getnode(r);
|
|
r->type = Node_param_list;
|
|
r->rnode = NULL;
|
|
r->param = name;
|
|
r->param_cnt = param_counter++;
|
|
return (install(name, r));
|
|
}
|
|
|
|
static struct fdesc {
|
|
char *name;
|
|
short used;
|
|
short defined;
|
|
struct fdesc *next;
|
|
} *ftable[HASHSIZE];
|
|
|
|
/* func_use --- track uses and definitions of functions */
|
|
|
|
static void
|
|
func_use(name, how)
|
|
char *name;
|
|
enum defref how;
|
|
{
|
|
struct fdesc *fp;
|
|
int len;
|
|
int ind;
|
|
|
|
len = strlen(name);
|
|
ind = hash(name, len, HASHSIZE);
|
|
|
|
for (fp = ftable[ind]; fp != NULL; fp = fp->next) {
|
|
if (strcmp(fp->name, name) == 0) {
|
|
if (how == FUNC_DEFINE)
|
|
fp->defined++;
|
|
else
|
|
fp->used++;
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* not in the table, fall through to allocate a new one */
|
|
|
|
emalloc(fp, struct fdesc *, sizeof(struct fdesc), "func_use");
|
|
memset(fp, '\0', sizeof(struct fdesc));
|
|
emalloc(fp->name, char *, len + 1, "func_use");
|
|
strcpy(fp->name, name);
|
|
if (how == FUNC_DEFINE)
|
|
fp->defined++;
|
|
else
|
|
fp->used++;
|
|
fp->next = ftable[ind];
|
|
ftable[ind] = fp;
|
|
}
|
|
|
|
/* check_funcs --- verify functions that are called but not defined */
|
|
|
|
static void
|
|
check_funcs()
|
|
{
|
|
struct fdesc *fp, *next;
|
|
int i;
|
|
|
|
for (i = 0; i < HASHSIZE; i++) {
|
|
for (fp = ftable[i]; fp != NULL; fp = fp->next) {
|
|
#ifdef REALLYMEAN
|
|
/* making this the default breaks old code. sigh. */
|
|
if (fp->defined == 0) {
|
|
error(
|
|
"function `%s' called but never defined", fp->name);
|
|
errcount++;
|
|
}
|
|
#else
|
|
if (do_lint && fp->defined == 0)
|
|
warning(
|
|
"function `%s' called but never defined", fp->name);
|
|
#endif
|
|
if (do_lint && fp->used == 0) {
|
|
warning("function `%s' defined but never called",
|
|
fp->name);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* now let's free all the memory */
|
|
for (i = 0; i < HASHSIZE; i++) {
|
|
for (fp = ftable[i]; fp != NULL; fp = next) {
|
|
next = fp->next;
|
|
free(fp->name);
|
|
free(fp);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* param_sanity --- look for parameters that are regexp constants */
|
|
|
|
static void
|
|
param_sanity(arglist)
|
|
NODE *arglist;
|
|
{
|
|
NODE *argp, *arg;
|
|
int i;
|
|
|
|
for (i = 1, argp = arglist; argp != NULL; argp = argp->rnode, i++) {
|
|
arg = argp->lnode;
|
|
if (arg->type == Node_regex)
|
|
warning("regexp constant for parameter #%d yields boolean value", i);
|
|
}
|
|
}
|
|
|
|
/* variable --- make sure NAME is in the symbol table */
|
|
|
|
NODE *
|
|
variable(name, can_free, type)
|
|
char *name;
|
|
int can_free;
|
|
NODETYPE type;
|
|
{
|
|
register NODE *r;
|
|
static int env_loaded = FALSE;
|
|
|
|
if (! env_loaded && STREQ(name, "ENVIRON")) {
|
|
load_environ();
|
|
env_loaded = TRUE;
|
|
}
|
|
if ((r = lookup(name)) == NULL)
|
|
r = install(name, node(Nnull_string, type, (NODE *) NULL));
|
|
else if (can_free)
|
|
free(name);
|
|
return r;
|
|
}
|
|
|
|
/* mk_rexp --- make a regular expression constant */
|
|
|
|
static NODE *
|
|
mk_rexp(exp)
|
|
NODE *exp;
|
|
{
|
|
NODE *n;
|
|
|
|
if (exp->type == Node_regex)
|
|
return exp;
|
|
|
|
getnode(n);
|
|
n->type = Node_regex;
|
|
n->re_exp = exp;
|
|
n->re_text = NULL;
|
|
n->re_reg = NULL;
|
|
n->re_flags = 0;
|
|
n->re_cnt = 1;
|
|
return n;
|
|
}
|
|
|
|
/* isnoeffect --- when used as a statement, has no side effects */
|
|
|
|
/*
|
|
* To be completely general, we should recursively walk the parse
|
|
* tree, to make sure that all the subexpressions also have no effect.
|
|
* Instead, we just weaken the actual warning that's printed, up above
|
|
* in the grammar.
|
|
*/
|
|
|
|
static int
|
|
isnoeffect(type)
|
|
NODETYPE type;
|
|
{
|
|
switch (type) {
|
|
case Node_times:
|
|
case Node_quotient:
|
|
case Node_mod:
|
|
case Node_plus:
|
|
case Node_minus:
|
|
case Node_subscript:
|
|
case Node_concat:
|
|
case Node_exp:
|
|
case Node_unary_minus:
|
|
case Node_field_spec:
|
|
case Node_and:
|
|
case Node_or:
|
|
case Node_equal:
|
|
case Node_notequal:
|
|
case Node_less:
|
|
case Node_greater:
|
|
case Node_leq:
|
|
case Node_geq:
|
|
case Node_match:
|
|
case Node_nomatch:
|
|
case Node_not:
|
|
case Node_val:
|
|
case Node_in_array:
|
|
case Node_NF:
|
|
case Node_NR:
|
|
case Node_FNR:
|
|
case Node_FS:
|
|
case Node_RS:
|
|
case Node_FIELDWIDTHS:
|
|
case Node_IGNORECASE:
|
|
case Node_OFS:
|
|
case Node_ORS:
|
|
case Node_OFMT:
|
|
case Node_CONVFMT:
|
|
return TRUE;
|
|
default:
|
|
break; /* keeps gcc -Wall happy */
|
|
}
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
/* isassignable --- can this node be assigned to? */
|
|
|
|
static int
|
|
isassignable(n)
|
|
register NODE *n;
|
|
{
|
|
switch (n->type) {
|
|
case Node_var:
|
|
case Node_FIELDWIDTHS:
|
|
case Node_RS:
|
|
case Node_FS:
|
|
case Node_FNR:
|
|
case Node_NR:
|
|
case Node_NF:
|
|
case Node_IGNORECASE:
|
|
case Node_OFMT:
|
|
case Node_CONVFMT:
|
|
case Node_ORS:
|
|
case Node_OFS:
|
|
case Node_field_spec:
|
|
case Node_subscript:
|
|
return TRUE;
|
|
case Node_param_list:
|
|
return ((n->flags & FUNC) == 0); /* ok if not func name */
|
|
default:
|
|
break; /* keeps gcc -Wall happy */
|
|
}
|
|
return FALSE;
|
|
}
|