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parse.y
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/********************************************
parse.y
copyright 2008-2010,2012, Thomas E. Dickey
copyright 1991-1994,1995, Michael D. Brennan
This is a source file for mawk, an implementation of
the AWK programming language.
Mawk is distributed without warranty under the terms of
the GNU General Public License, version 2, 1991.
********************************************/
/*
* $MawkId: parse.y,v 1.19 2012/11/28 10:43:56 tom Exp $
* @Log: parse.y,v @
* Revision 1.11 1995/06/11 22:40:09 mike
* change if(dump_code) -> if(dump_code_flag)
* cleanup of parse()
* add cast to shutup solaris cc compiler on char to int comparison
* switch_code_to_main() which cleans up outside_error production
*
* Revision 1.10 1995/04/21 14:20:21 mike
* move_level variable to fix bug in arglist patching of moved code.
*
* Revision 1.9 1995/02/19 22:15:39 mike
* Always set the call_offset field in a CA_REC (for obscure
* reasons in fcall.c (see comments) there.)
*
* Revision 1.8 1994/12/13 00:39:20 mike
* delete A statement to delete all of A at once
*
* Revision 1.7 1994/10/08 19:15:48 mike
* remove SM_DOS
*
* Revision 1.6 1993/12/01 14:25:17 mike
* reentrant array loops
*
* Revision 1.5 1993/07/22 00:04:13 mike
* new op code _LJZ _LJNZ
*
* Revision 1.4 1993/07/15 23:38:15 mike
* SIZE_T and indent
*
* Revision 1.3 1993/07/07 00:07:46 mike
* more work on 1.2
*
* Revision 1.2 1993/07/03 21:18:01 mike
* bye to yacc_mem
*
* Revision 1.1.1.1 1993/07/03 18:58:17 mike
* move source to cvs
*
* Revision 5.8 1993/05/03 01:07:18 mike
* fix bozo in LENGTH production
*
* Revision 5.7 1993/01/09 19:03:44 mike
* code_pop checks if the resolve_list needs relocation
*
* Revision 5.6 1993/01/07 02:50:33 mike
* relative vs absolute code
*
* Revision 5.5 1993/01/01 21:30:48 mike
* split new_STRING() into new_STRING and new_STRING0
*
* Revision 5.4 1992/08/08 17:17:20 brennan
* patch 2: improved timing of error recovery in
* bungled function definitions. Fixes a core dump
*
* Revision 5.3 1992/07/08 15:43:41 brennan
* patch2: length returns. I am a wimp
*
* Revision 5.2 1992/01/08 16:11:42 brennan
* code FE_PUSHA carefully for MSDOS large mode
*
* Revision 5.1 91/12/05 07:50:22 brennan
* 1.1 pre-release
*
*/
%{
#include <stdio.h>
#include "mawk.h"
#include "symtype.h"
#include "code.h"
#include "memory.h"
#include "bi_funct.h"
#include "bi_vars.h"
#include "jmp.h"
#include "field.h"
#include "files.h"
#define YYMAXDEPTH 200
extern void eat_nl(void);
static SYMTAB *save_arglist(const char *);
static int init_arglist(void);
static void RE_as_arg(void);
static void check_array(SYMTAB *);
static void check_var(SYMTAB *);
static void code_array(SYMTAB *);
static void code_call_id(CA_REC *, SYMTAB *);
static void field_A2I(void);
static void free_arglist(void);
static void improve_arglist(const char *);
static void resize_fblock(FBLOCK *);
static void switch_code_to_main(void);
static int scope;
static FBLOCK *active_funct;
static CA_REC *active_arglist;
/* when scope is SCOPE_FUNCT */
#define code_address(x) if( is_local(x) ) \
code2op(L_PUSHA, (x)->offset) ;\
else code2(_PUSHA, (x)->stval.cp)
#define CDP(x) (code_base+(x))
/* WARNING: These CDP() calculations become invalid after calls
that might change code_base. Which are: code2(), code2op(),
code_jmp() and code_pop().
*/
/* this nonsense caters to MSDOS large model */
#define CODE_FE_PUSHA() code_ptr->ptr = (PTR) 0 ; code1(FE_PUSHA)
%}
%union{
CELL *cp ;
SYMTAB *stp ;
int start ; /* code starting address as offset from code_base */
PF_CP fp ; /* ptr to a (print/printf) or (sub/gsub) function */
BI_REC *bip ; /* ptr to info about a builtin */
FBLOCK *fbp ; /* ptr to a function block */
ARG2_REC *arg2p ;
CA_REC *ca_p ;
int ival ;
PTR ptr ;
}
/* two tokens to help with errors */
%token UNEXPECTED /* unexpected character */
%token BAD_DECIMAL
%token NL
%token SEMI_COLON
%token LBRACE RBRACE
%token LBOX RBOX
%token COMMA
%token <ival> IO_OUT /* > or output pipe */
%right ASSIGN ADD_ASG SUB_ASG MUL_ASG DIV_ASG MOD_ASG POW_ASG
%right QMARK COLON
%left OR
%left AND
%left IN
%left <ival> MATCH /* ~ or !~ */
%left EQ NEQ LT LTE GT GTE
%left CAT
%left GETLINE
%left PLUS MINUS
%left MUL DIV MOD
%left NOT UMINUS
%nonassoc IO_IN PIPE
%right POW
%left <ival> INC_or_DEC
%left DOLLAR FIELD /* last to remove a SR conflict
with getline */
%right LPAREN RPAREN /* removes some SR conflicts */
%token <ptr> DOUBLE STRING_ RE
%token <stp> ID D_ID
%token <fbp> FUNCT_ID
%token <bip> BUILTIN LENGTH
%token <cp> FIELD
%token PRINT PRINTF SPLIT MATCH_FUNC SUB GSUB
/* keywords */
%token DO WHILE FOR BREAK CONTINUE IF ELSE IN
%token DELETE BEGIN END EXIT NEXT NEXTFILE RETURN FUNCTION
%type <start> block block_or_separator
%type <start> statement_list statement mark
%type <ival> pr_args
%type <arg2p> arg2
%type <start> builtin
%type <start> getline_file
%type <start> lvalue field fvalue
%type <start> expr cat_expr p_expr
%type <start> while_front if_front
%type <start> for1 for2
%type <start> array_loop_front
%type <start> return_statement
%type <start> split_front re_arg sub_back
%type <ival> arglist args
%type <fp> print sub_or_gsub
%type <fbp> funct_start funct_head
%type <ca_p> call_args ca_front ca_back
%type <ival> f_arglist f_args
%%
/* productions */
program : program_block
| program program_block
;
program_block : PA_block /* pattern-action */
| function_def
| outside_error block
;
PA_block : block
{ /* this do nothing action removes a vacuous warning
from Bison */
}
| BEGIN
{ be_setup(scope = SCOPE_BEGIN) ; }
block
{ switch_code_to_main() ; }
| END
{ be_setup(scope = SCOPE_END) ; }
block
{ switch_code_to_main() ; }
| expr /* this works just like an if statement */
{ code_jmp(_JZ, (INST*)0) ; }
block_or_separator
{ patch_jmp( code_ptr ) ; }
/* range pattern, see comment in execute.c near _RANGE */
| expr COMMA
{
INST *p1 = CDP($1) ;
int len ;
code_push(p1, (unsigned) CodeOffset(p1), scope, active_funct) ;
code_ptr = p1 ;
code2op(_RANGE, 1) ;
code_ptr += 3 ;
len = (int) code_pop(code_ptr) ;
code_ptr += len ;
code1(_STOP) ;
p1 = CDP($1) ;
p1[2].op = CodeOffset(p1 + 1) ;
}
expr
{ code1(_STOP) ; }
block_or_separator
{
INST *p1 = CDP($1) ;
p1[3].op = (int) (CDP($6) - (p1 + 1)) ;
p1[4].op = CodeOffset(p1 + 1) ;
}
;
block : LBRACE statement_list RBRACE
{ $$ = $2 ; }
| LBRACE error RBRACE
{ $$ = code_offset ; /* does nothing won't be executed */
print_flag = getline_flag = paren_cnt = 0 ;
yyerrok ; }
;
block_or_separator : block
| separator /* default print action */
{ $$ = code_offset ;
code1(_PUSHINT) ; code1(0) ;
code2(_PRINT, bi_print) ;
}
;
statement_list : statement
| statement_list statement
;
statement : block
| expr separator
{ code1(_POP) ; }
| /* empty */ separator
{ $$ = code_offset ; }
| error separator
{ $$ = code_offset ;
print_flag = getline_flag = 0 ;
paren_cnt = 0 ;
yyerrok ;
}
| BREAK separator
{ $$ = code_offset ; BC_insert('B', code_ptr+1) ;
code2(_JMP, 0) /* don't use code_jmp ! */ ; }
| CONTINUE separator
{ $$ = code_offset ; BC_insert('C', code_ptr+1) ;
code2(_JMP, 0) ; }
| return_statement
{ if ( scope != SCOPE_FUNCT )
compile_error("return outside function body") ;
}
| NEXT separator
{ if ( scope != SCOPE_MAIN )
compile_error( "improper use of next" ) ;
$$ = code_offset ;
code1(_NEXT) ;
}
| NEXTFILE separator
{ if ( scope != SCOPE_MAIN )
compile_error( "improper use of nextfile" ) ;
$$ = code_offset ;
code1(_NEXTFILE) ;
}
;
separator : NL | SEMI_COLON
;
expr : cat_expr
| lvalue ASSIGN expr { code1(_ASSIGN) ; }
| lvalue ADD_ASG expr { code1(_ADD_ASG) ; }
| lvalue SUB_ASG expr { code1(_SUB_ASG) ; }
| lvalue MUL_ASG expr { code1(_MUL_ASG) ; }
| lvalue DIV_ASG expr { code1(_DIV_ASG) ; }
| lvalue MOD_ASG expr { code1(_MOD_ASG) ; }
| lvalue POW_ASG expr { code1(_POW_ASG) ; }
| expr EQ expr { code1(_EQ) ; }
| expr NEQ expr { code1(_NEQ) ; }
| expr LT expr { code1(_LT) ; }
| expr LTE expr { code1(_LTE) ; }
| expr GT expr { code1(_GT) ; }
| expr GTE expr { code1(_GTE) ; }
| expr MATCH expr
{
INST *p3 = CDP($3) ;
if ( p3 == code_ptr - 2 )
{
if ( p3->op == _MATCH0 ) p3->op = _MATCH1 ;
else /* check for string */
if ( p3->op == _PUSHS )
{ CELL *cp = ZMALLOC(CELL) ;
cp->type = C_STRING ;
cp->ptr = p3[1].ptr ;
cast_to_RE(cp) ;
no_leaks_re_ptr(cp->ptr) ;
code_ptr -= 2 ;
code2(_MATCH1, cp->ptr) ;
ZFREE(cp) ;
}
else code1(_MATCH2) ;
}
else code1(_MATCH2) ;
if ( !$2 ) code1(_NOT) ;
}
/* short circuit boolean evaluation */
| expr OR
{ code1(_TEST) ;
code_jmp(_LJNZ, (INST*)0) ;
}
expr
{ code1(_TEST) ; patch_jmp(code_ptr) ; }
| expr AND
{ code1(_TEST) ;
code_jmp(_LJZ, (INST*)0) ;
}
expr
{ code1(_TEST) ; patch_jmp(code_ptr) ; }
| expr QMARK { code_jmp(_JZ, (INST*)0) ; }
expr COLON { code_jmp(_JMP, (INST*)0) ; }
expr
{ patch_jmp(code_ptr) ; patch_jmp(CDP($7)) ; }
;
cat_expr : p_expr %prec CAT
| cat_expr p_expr %prec CAT
{ code1(_CAT) ; }
;
p_expr : DOUBLE
{ $$ = code_offset ; code2(_PUSHD, $1) ; }
| STRING_
{ $$ = code_offset ; code2(_PUSHS, $1) ; }
| ID %prec AND /* anything less than IN */
{ check_var($1) ;
$$ = code_offset ;
if ( is_local($1) )
{ code2op(L_PUSHI, $1->offset) ; }
else code2(_PUSHI, $1->stval.cp) ;
}
| LPAREN expr RPAREN
{ $$ = $2 ; }
;
p_expr : RE
{ $$ = code_offset ;
code2(_MATCH0, $1) ;
no_leaks_re_ptr($1);
}
;
p_expr : p_expr PLUS p_expr { code1(_ADD) ; }
| p_expr MINUS p_expr { code1(_SUB) ; }
| p_expr MUL p_expr { code1(_MUL) ; }
| p_expr DIV p_expr { code1(_DIV) ; }
| p_expr MOD p_expr { code1(_MOD) ; }
| p_expr POW p_expr { code1(_POW) ; }
| NOT p_expr
{ $$ = $2 ; code1(_NOT) ; }
| PLUS p_expr %prec UMINUS
{ $$ = $2 ; code1(_UPLUS) ; }
| MINUS p_expr %prec UMINUS
{ $$ = $2 ; code1(_UMINUS) ; }
| builtin
;
p_expr : ID INC_or_DEC
{ check_var($1) ;
$$ = code_offset ;
code_address($1) ;
if ( $2 == '+' ) code1(_POST_INC) ;
else code1(_POST_DEC) ;
}
| INC_or_DEC lvalue
{ $$ = $2 ;
if ( $1 == '+' ) code1(_PRE_INC) ;
else code1(_PRE_DEC) ;
}
;
p_expr : field INC_or_DEC
{ if ($2 == '+' ) code1(F_POST_INC ) ;
else code1(F_POST_DEC) ;
}
| INC_or_DEC field
{ $$ = $2 ;
if ( $1 == '+' ) code1(F_PRE_INC) ;
else code1( F_PRE_DEC) ;
}
;
lvalue : ID
{ $$ = code_offset ;
check_var($1) ;
code_address($1) ;
}
;
arglist : /* empty */
{ $$ = 0 ; }
| args
;
args : expr %prec LPAREN
{ $$ = 1 ; }
| args COMMA expr
{ $$ = $1 + 1 ; }
;
builtin :
BUILTIN mark LPAREN ID RPAREN
{ BI_REC *p = $1 ;
$$ = $2 ;
if ( (int)p->min_args > 1 || (int)p->max_args < 1 )
compile_error(
"wrong number of arguments in call to %s" ,
p->name ) ;
/* if we have length(array), emit a different code */
if ( p->fp == bi_length && is_array($4) ) {
check_array($4) ;
code_array($4) ;
{ code1(_PUSHINT) ; code1(1) ; }
code1(A_LENGTH) ;
} else {
check_var($4);
if ( is_local($4) )
{ code1(L_PUSHI); code1($4->offset) ; }
else { code2(_PUSHI, $4->stval.cp) ; }
if ( p->min_args != p->max_args ) /* variable args */
{ code1(_PUSHINT) ; code1(1) ; }
code2(_BUILTIN, p->fp) ;
}
}
| BUILTIN mark LPAREN arglist RPAREN
{ BI_REC *p = $1 ;
$$ = $2 ;
if ( (int)p->min_args > $4 || (int)p->max_args < $4 )
compile_error(
"wrong number of arguments in call to %s" ,
p->name ) ;
if ( p->min_args != p->max_args ) /* variable args */
{ code1(_PUSHINT) ; code1($4) ; }
code2(_BUILTIN , p->fp) ;
}
| LENGTH /* this is an irritation */
{
$$ = code_offset ;
code1(_PUSHINT) ; code1(0) ;
code2(_BUILTIN, $1->fp) ;
}
;
/* an empty production to store the code_ptr */
mark : /* empty */
{ $$ = code_offset ; }
;
/* print_statement */
statement : print mark pr_args pr_direction separator
{ code2(_PRINT, $1) ;
if ( $1 == bi_printf && $3 == 0 )
compile_error("no arguments in call to printf") ;
print_flag = 0 ;
$$ = $2 ;
}
;
print : PRINT { $$ = bi_print ; print_flag = 1 ;}
| PRINTF { $$ = bi_printf ; print_flag = 1 ; }
;
pr_args : arglist { code2op(_PUSHINT, $1) ; }
| LPAREN arg2 RPAREN
{ $$ = $2->cnt ; zfree($2,sizeof(ARG2_REC)) ;
code2op(_PUSHINT, $$) ;
}
| LPAREN RPAREN
{ $$=0 ; code2op(_PUSHINT, 0) ; }
;
arg2 : expr COMMA expr
{ $$ = (ARG2_REC*) zmalloc(sizeof(ARG2_REC)) ;
$$->start = $1 ;
$$->cnt = 2 ;
}
| arg2 COMMA expr
{ $$ = $1 ; $$->cnt++ ; }
;
pr_direction : /* empty */
| IO_OUT expr
{ code2op(_PUSHINT, $1) ; }
;
/* IF and IF-ELSE */
if_front : IF LPAREN expr RPAREN
{ $$ = $3 ; eat_nl() ; code_jmp(_JZ, (INST*)0) ; }
;
/* if_statement */
statement : if_front statement
{ patch_jmp( code_ptr ) ; }
;
else : ELSE { eat_nl() ; code_jmp(_JMP, (INST*)0) ; }
;
/* if_else_statement */
statement : if_front statement else statement
{ patch_jmp(code_ptr) ;
patch_jmp(CDP($4)) ;
}
;
/* LOOPS */
do : DO
{ eat_nl() ; BC_new() ; }
;
/* do_statement */
statement : do statement WHILE LPAREN expr RPAREN separator
{ $$ = $2 ;
code_jmp(_JNZ, CDP($2)) ;
BC_clear(code_ptr, CDP($5)) ; }
;
while_front : WHILE LPAREN expr RPAREN
{ eat_nl() ; BC_new() ;
$$ = $3 ;
/* check if const expression */
if ( code_ptr - 2 == CDP($3) &&
code_ptr[-2].op == _PUSHD &&
*(double*)code_ptr[-1].ptr != 0.0
)
code_ptr -= 2 ;
else
{ INST *p3 = CDP($3) ;
code_push(p3, (unsigned) CodeOffset(p3), scope, active_funct) ;
code_ptr = p3 ;
code2(_JMP, (INST*)0) ; /* code2() not code_jmp() */
}
}
;
/* while_statement */
statement : while_front statement
{
int saved_offset ;
int len ;
INST *p1 = CDP($1) ;
INST *p2 = CDP($2) ;
if ( p1 != p2 ) /* real test in loop */
{
p1[1].op = CodeOffset(p1 + 1) ;
saved_offset = code_offset ;
len = (int) code_pop(code_ptr) ;
code_ptr += len ;
code_jmp(_JNZ, CDP($2)) ;
BC_clear(code_ptr, CDP(saved_offset)) ;
}
else /* while(1) */
{
code_jmp(_JMP, p1) ;
BC_clear(code_ptr, CDP($2)) ;
}
}
;
/* for_statement */
statement : for1 for2 for3 statement
{
int cont_offset = code_offset ;
unsigned len = code_pop(code_ptr) ;
INST *p2 = CDP($2) ;
INST *p4 = CDP($4) ;
code_ptr += len ;
if ( p2 != p4 ) /* real test in for2 */
{
p4[-1].op = CodeOffset(p4 - 1) ;
len = code_pop(code_ptr) ;
code_ptr += len ;
code_jmp(_JNZ, CDP($4)) ;
}
else /* for(;;) */
code_jmp(_JMP, p4) ;
BC_clear(code_ptr, CDP(cont_offset)) ;
}
;
for1 : FOR LPAREN SEMI_COLON { $$ = code_offset ; }
| FOR LPAREN expr SEMI_COLON
{ $$ = $3 ; code1(_POP) ; }
;
for2 : SEMI_COLON { $$ = code_offset ; }
| expr SEMI_COLON
{
if ( code_ptr - 2 == CDP($1) &&
code_ptr[-2].op == _PUSHD &&
* (double*) code_ptr[-1].ptr != 0.0
)
code_ptr -= 2 ;
else
{
INST *p1 = CDP($1) ;
code_push(p1, (unsigned) CodeOffset(p1), scope, active_funct) ;
code_ptr = p1 ;
code2(_JMP, (INST*)0) ;
}
}
;
for3 : RPAREN
{ eat_nl() ; BC_new() ;
code_push((INST*)0,0, scope, active_funct) ;
}
| expr RPAREN
{ INST *p1 = CDP($1) ;
eat_nl() ; BC_new() ;
code1(_POP) ;
code_push(p1, (unsigned) CodeOffset(p1), scope, active_funct) ;
code_ptr -= code_ptr - p1 ;
}
;
/* arrays */
expr : expr IN ID
{ check_array($3) ;
code_array($3) ;
code1(A_TEST) ;
}
| LPAREN arg2 RPAREN IN ID
{ $$ = $2->start ;
code2op(A_CAT, $2->cnt) ;
zfree($2, sizeof(ARG2_REC)) ;
check_array($5) ;
code_array($5) ;
code1(A_TEST) ;
}
;
lvalue : ID mark LBOX args RBOX
{
if ( $4 > 1 )
{ code2op(A_CAT, $4) ; }
check_array($1) ;
if( is_local($1) )
{ code2op(LAE_PUSHA, $1->offset) ; }
else code2(AE_PUSHA, $1->stval.array) ;
$$ = $2 ;
}
;
p_expr : ID mark LBOX args RBOX %prec AND
{
if ( $4 > 1 )
{ code2op(A_CAT, $4) ; }
check_array($1) ;
if( is_local($1) )
{ code2op(LAE_PUSHI, $1->offset) ; }
else code2(AE_PUSHI, $1->stval.array) ;
$$ = $2 ;
}
| ID mark LBOX args RBOX INC_or_DEC
{
if ( $4 > 1 )
{ code2op(A_CAT,$4) ; }
check_array($1) ;
if( is_local($1) )
{ code2op(LAE_PUSHA, $1->offset) ; }
else code2(AE_PUSHA, $1->stval.array) ;
if ( $6 == '+' ) code1(_POST_INC) ;
else code1(_POST_DEC) ;
$$ = $2 ;
}
;
/* delete A[i] or delete A */
statement : DELETE ID mark LBOX args RBOX separator
{
$$ = $3 ;
if ( $5 > 1 ) { code2op(A_CAT, $5) ; }
check_array($2) ;
code_array($2) ;
code1(A_DEL) ;
}
| DELETE ID separator
{
$$ = code_offset ;
check_array($2) ;
code_array($2) ;
code1(DEL_A) ;
}
;
/* for ( i in A ) statement */
array_loop_front : FOR LPAREN ID IN ID RPAREN
{ eat_nl() ; BC_new() ;
$$ = code_offset ;
check_var($3) ;
code_address($3) ;
check_array($5) ;
code_array($5) ;
code2(SET_ALOOP, (INST*)0) ;
}
;
/* array_loop */
statement : array_loop_front statement
{
INST *p2 = CDP($2) ;
p2[-1].op = CodeOffset(p2 - 1) ;
BC_clear( code_ptr+2 , code_ptr) ;
code_jmp(ALOOP, p2) ;
code1(POP_AL) ;
}
;
/* fields
D_ID is a special token , same as an ID, but yylex()
only returns it after a '$'. In essense,
DOLLAR D_ID is really one token.
*/
field : FIELD
{ $$ = code_offset ; code2(F_PUSHA, $1) ; }
| DOLLAR D_ID
{ check_var($2) ;
$$ = code_offset ;
if ( is_local($2) )
{ code2op(L_PUSHI, $2->offset) ; }
else code2(_PUSHI, $2->stval.cp) ;
CODE_FE_PUSHA() ;
}
| DOLLAR D_ID mark LBOX args RBOX
{
if ( $5 > 1 )
{ code2op(A_CAT, $5) ; }
check_array($2) ;
if( is_local($2) )
{ code2op(LAE_PUSHI, $2->offset) ; }
else code2(AE_PUSHI, $2->stval.array) ;
CODE_FE_PUSHA() ;
$$ = $3 ;
}
| DOLLAR p_expr
{ $$ = $2 ; CODE_FE_PUSHA() ; }
| LPAREN field RPAREN
{ $$ = $2 ; }
;
p_expr : field %prec CAT /* removes field (++|--) sr conflict */
{ field_A2I() ; }
;
expr : field ASSIGN expr { code1(F_ASSIGN) ; }
| field ADD_ASG expr { code1(F_ADD_ASG) ; }
| field SUB_ASG expr { code1(F_SUB_ASG) ; }
| field MUL_ASG expr { code1(F_MUL_ASG) ; }
| field DIV_ASG expr { code1(F_DIV_ASG) ; }
| field MOD_ASG expr { code1(F_MOD_ASG) ; }
| field POW_ASG expr { code1(F_POW_ASG) ; }
;
/* split is handled different than a builtin because
it takes an array and optionally a regular expression as args */
p_expr : split_front split_back
{ code2(_BUILTIN, bi_split) ; }
;
split_front : SPLIT LPAREN expr COMMA ID
{ $$ = $3 ;
check_array($5) ;
code_array($5) ;
}
;
split_back : RPAREN
{ code2(_PUSHI, &fs_shadow) ; }
| COMMA expr RPAREN
{
if ( CDP($2) == code_ptr - 2 )
{
if ( code_ptr[-2].op == _MATCH0 )
RE_as_arg() ;
else
if ( code_ptr[-2].op == _PUSHS )
{ CELL *cp = ZMALLOC(CELL) ;
cp->type = C_STRING ;
cp->ptr = code_ptr[-1].ptr ;
cast_for_split(cp) ;
code_ptr[-2].op = _PUSHC ;
code_ptr[-1].ptr = (PTR) cp ;
no_leaks_cell(cp);
}
}
}
;
/* match(expr, RE) */
p_expr : MATCH_FUNC LPAREN expr COMMA re_arg RPAREN
{ $$ = $3 ;
code2(_BUILTIN, bi_match) ;
}
;
re_arg : expr
{
INST *p1 = CDP($1) ;
if ( p1 == code_ptr - 2 )
{
if ( p1->op == _MATCH0 ) RE_as_arg() ;
else
if ( p1->op == _PUSHS )
{ CELL *cp = ZMALLOC(CELL) ;
cp->type = C_STRING ;
cp->ptr = p1[1].ptr ;
cast_to_RE(cp) ;
p1->op = _PUSHC ;
p1[1].ptr = (PTR) cp ;
no_leaks_cell(cp);
}
}
}
;
/* exit_statement */
statement : EXIT separator
{ $$ = code_offset ;
code1(_EXIT0) ; }
| EXIT expr separator
{ $$ = $2 ; code1(_EXIT) ; }
;
return_statement : RETURN separator
{ $$ = code_offset ;
code1(_RET0) ; }
| RETURN expr separator
{ $$ = $2 ; code1(_RET) ; }
;
/* getline */
p_expr : getline %prec GETLINE
{ $$ = code_offset ;
code2(F_PUSHA, &field[0]) ;
code1(_PUSHINT) ; code1(0) ;
code2(_BUILTIN, bi_getline) ;
getline_flag = 0 ;
}
| getline fvalue %prec GETLINE
{ $$ = $2 ;
code1(_PUSHINT) ; code1(0) ;
code2(_BUILTIN, bi_getline) ;
getline_flag = 0 ;
}
| getline_file p_expr %prec IO_IN
{ code1(_PUSHINT) ; code1(F_IN) ;
code2(_BUILTIN, bi_getline) ;
/* getline_flag already off in yylex() */
}
| p_expr PIPE GETLINE
{ code2(F_PUSHA, &field[0]) ;
code1(_PUSHINT) ; code1(PIPE_IN) ;
code2(_BUILTIN, bi_getline) ;
}
| p_expr PIPE GETLINE fvalue
{
code1(_PUSHINT) ; code1(PIPE_IN) ;
code2(_BUILTIN, bi_getline) ;
}
;
getline : GETLINE { getline_flag = 1 ; } ;
fvalue : lvalue | field ;
getline_file : getline IO_IN
{ $$ = code_offset ;
code2(F_PUSHA, field+0) ;
}
| getline fvalue IO_IN
{ $$ = $2 ; }
;
/*==========================================
sub and gsub
==========================================*/
p_expr : sub_or_gsub LPAREN re_arg COMMA expr sub_back
{
INST *p5 = CDP($5) ;
INST *p6 = CDP($6) ;