binutils/ld/ldgram.y

/* A YACC grammer to parse a superset of the AT&T linker scripting languaue.
   Copyright (C) 1991, 92, 93, 94, 95, 1996 Free Software Foundation, Inc.
   Written by Steve Chamberlain of Cygnus Support (steve@cygnus.com).

This file is part of GNU ld.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

%{
/*

 */

#define DONTDECLARE_MALLOC

#include "bfd.h"
#include "sysdep.h"
#include "bfdlink.h"
#include "ld.h"
#include "ldexp.h"
#include "ldver.h"
#include "ldlang.h"
#include "ldemul.h"
#include "ldfile.h"
#include "ldmisc.h"
#include "ldmain.h"
#include "mri.h"
#include "ldlex.h"

#ifndef YYDEBUG
#define YYDEBUG 1
#endif

static int typebits;

lang_memory_region_type *region;


char *current_file;
boolean ldgram_want_filename = true;
boolean had_script = false;
boolean force_make_executable = false;

boolean ldgram_in_script = false;
boolean ldgram_had_equals = false;


#define ERROR_NAME_MAX 20
static char *error_names[ERROR_NAME_MAX];
static int error_index;
#define PUSH_ERROR(x) if (error_index < ERROR_NAME_MAX) error_names[error_index] = x; error_index++;
#define POP_ERROR()   error_index--;
%}
%union {
  bfd_vma integer;
  char *name;
  int token;
  union etree_union *etree;
  struct phdr_info
    {
      boolean filehdr;
      boolean phdrs;
      union etree_union *at;
      union etree_union *flags;
    } phdr;
}

%type <etree> exp opt_exp_with_type mustbe_exp opt_at phdr_type phdr_val
%type <integer> fill_opt
%type <name> memspec_opt casesymlist
%token <integer> INT
%token <name> NAME LNAME
%type  <integer> length
%type <phdr> phdr_qualifiers

%right <token> PLUSEQ MINUSEQ MULTEQ DIVEQ  '=' LSHIFTEQ RSHIFTEQ   ANDEQ OREQ
%right <token> '?' ':'
%left <token> OROR
%left <token>  ANDAND
%left <token> '|'
%left <token>  '^'
%left  <token> '&'
%left <token>  EQ NE
%left  <token> '<' '>' LE GE
%left  <token> LSHIFT RSHIFT

%left  <token> '+' '-'
%left  <token> '*' '/' '%'

%right UNARY
%token END
%left <token> '('
%token <token> ALIGN_K BLOCK QUAD LONG SHORT BYTE
%token SECTIONS PHDRS
%token '{' '}'
%token SIZEOF_HEADERS OUTPUT_FORMAT FORCE_COMMON_ALLOCATION OUTPUT_ARCH
%token SIZEOF_HEADERS
%token INCLUDE
%token MEMORY DEFSYMEND
%token NOLOAD DSECT COPY INFO OVERLAY
%token NAME LNAME DEFINED TARGET_K SEARCH_DIR MAP ENTRY
%token <integer> SIZEOF NEXT ADDR
%token STARTUP HLL SYSLIB FLOAT NOFLOAT
%token ORIGIN FILL
%token LENGTH CREATE_OBJECT_SYMBOLS INPUT GROUP OUTPUT CONSTRUCTORS
%token ALIGNMOD AT PROVIDE
%type <token> assign_op atype
%type <name>  filename
%token CHIP LIST SECT ABSOLUTE  LOAD NEWLINE ENDWORD ORDER NAMEWORD
%token FORMAT PUBLIC DEFSYMEND BASE ALIAS TRUNCATE REL
%token INPUT_SCRIPT INPUT_MRI_SCRIPT INPUT_DEFSYM CASE EXTERN START

%%

file:
		INPUT_SCRIPT script_file
	|	INPUT_MRI_SCRIPT mri_script_file
	|	INPUT_DEFSYM defsym_expr
	;


filename:  NAME;


defsym_expr:
		{ ldlex_defsym(); }
		NAME '=' exp
		{
		  ldlex_popstate();
		  lang_add_assignment(exp_assop($3,$2,$4));
		}

/* SYNTAX WITHIN AN MRI SCRIPT FILE */
mri_script_file:
		{
		  ldlex_mri_script ();
		  PUSH_ERROR ("MRI style script");
		}
	     mri_script_lines
		{
		  ldlex_popstate ();
		  mri_draw_tree ();
		  POP_ERROR ();
		}
	;

mri_script_lines:
		mri_script_lines mri_script_command NEWLINE
          |
	;

mri_script_command:
		CHIP  exp
	|	CHIP  exp ',' exp
	|	NAME 	{
			einfo("%P%F: unrecognised keyword in MRI style script '%s'\n",$1);
			}
	|	LIST  	{
			config.map_filename = "-";
			}
        |       ORDER ordernamelist
	|       ENDWORD
        |       PUBLIC NAME '=' exp
 			{ mri_public($2, $4); }
        |       PUBLIC NAME ',' exp
 			{ mri_public($2, $4); }
        |       PUBLIC NAME  exp
 			{ mri_public($2, $3); }
	| 	FORMAT NAME
			{ mri_format($2); }
	|	SECT NAME ',' exp
			{ mri_output_section($2, $4);}
	|	SECT NAME  exp
			{ mri_output_section($2, $3);}
	|	SECT NAME '=' exp
			{ mri_output_section($2, $4);}
	|	ALIGN_K NAME '=' exp
			{ mri_align($2,$4); }
	|	ALIGN_K NAME ',' exp
			{ mri_align($2,$4); }
	|	ALIGNMOD NAME '=' exp
			{ mri_alignmod($2,$4); }
	|	ALIGNMOD NAME ',' exp
			{ mri_alignmod($2,$4); }
	|	ABSOLUTE mri_abs_name_list
	|	LOAD	 mri_load_name_list
	|       NAMEWORD NAME
			{ mri_name($2); }
	|	ALIAS NAME ',' NAME
			{ mri_alias($2,$4,0);}
	|	ALIAS NAME ',' INT
			{ mri_alias($2,0,(int) $4);}
	|	BASE     exp
			{ mri_base($2); }
        |       TRUNCATE INT
		{  mri_truncate((unsigned int) $2); }
	|	CASE casesymlist
	|	EXTERN extern_name_list
	|	INCLUDE filename
		{ ldfile_open_command_file ($2); } mri_script_lines END
	|	START NAME
		{ lang_add_entry ($2, false); }
        |
	;

ordernamelist:
	      ordernamelist ',' NAME         { mri_order($3); }
	|     ordernamelist  NAME         { mri_order($2); }
      	|
	;

mri_load_name_list:
		NAME
			{ mri_load($1); }
	|	mri_load_name_list ',' NAME { mri_load($3); }
	;

mri_abs_name_list:
 		NAME
 			{ mri_only_load($1); }
	|	mri_abs_name_list ','  NAME
 			{ mri_only_load($3); }
	;

casesymlist:
	  /* empty */ { $$ = NULL; }
	| NAME
	| casesymlist ',' NAME
	;

extern_name_list:
	  NAME
			{ ldlang_add_undef ($1); }
	| extern_name_list ',' NAME
			{ ldlang_add_undef ($3); }
	;

script_file:
	{
	 ldlex_both();
	}
       ifile_list
	{
	ldlex_popstate();
	}
        ;


ifile_list:
       ifile_list ifile_p1
        |
	;


ifile_p1:
		memory
	|	sections
	|	phdrs
	|	startup
	|	high_level_library
	|	low_level_library
	|	floating_point_support
	|	statement_anywhere
        |	 ';'
	|	TARGET_K '(' NAME ')'
		{ lang_add_target($3); }
	|	SEARCH_DIR '(' filename ')'
		{ ldfile_add_library_path ($3, false); }
	|	OUTPUT '(' filename ')'
		{ lang_add_output($3, 1); }
        |	OUTPUT_FORMAT '(' NAME ')'
		  { lang_add_output_format ($3, (char *) NULL,
					    (char *) NULL, 1); }
	|	OUTPUT_FORMAT '(' NAME ',' NAME ',' NAME ')'
		  { lang_add_output_format ($3, $5, $7, 1); }
        |	OUTPUT_ARCH '(' NAME ')'
		  { ldfile_set_output_arch($3); }
	|	FORCE_COMMON_ALLOCATION
		{ command_line.force_common_definition = true ; }
	|	INPUT '(' input_list ')'
	|	GROUP
		  { lang_enter_group (); }
		    '(' input_list ')'
		  { lang_leave_group (); }
     	|	MAP '(' filename ')'
		{ lang_add_map($3); }
	|	INCLUDE filename
		{ ldfile_open_command_file($2); } ifile_list END
	;

input_list:
		NAME
		{ lang_add_input_file($1,lang_input_file_is_search_file_enum,
				 (char *)NULL); }
	|	input_list ',' NAME
		{ lang_add_input_file($3,lang_input_file_is_search_file_enum,
				 (char *)NULL); }
	|	input_list NAME
		{ lang_add_input_file($2,lang_input_file_is_search_file_enum,
				 (char *)NULL); }
	|	LNAME
		{ lang_add_input_file($1,lang_input_file_is_l_enum,
				 (char *)NULL); }
	|	input_list ',' LNAME
		{ lang_add_input_file($3,lang_input_file_is_l_enum,
				 (char *)NULL); }
	|	input_list LNAME
		{ lang_add_input_file($2,lang_input_file_is_l_enum,
				 (char *)NULL); }
	;

sections:
		SECTIONS '{' sec_or_group_p1 '}'
	;

sec_or_group_p1:
		sec_or_group_p1 section
	|	sec_or_group_p1 statement_anywhere
	|
	;

statement_anywhere:
		ENTRY '(' NAME ')'
		{ lang_add_entry ($3, false); }
	|	assignment end
	;

file_NAME_list:
		NAME
			{ lang_add_wild($1, current_file); }
	|	file_NAME_list opt_comma NAME
			{ lang_add_wild($3, current_file); }
	;

input_section_spec:
		NAME
		{
		lang_add_wild((char *)NULL, $1);
		}
        |	'['
			{
			current_file = (char *)NULL;
			}
			file_NAME_list
		']'
	|	NAME
			{
			current_file =$1;
			}
		'(' file_NAME_list ')'
	|	'*'
			{
			current_file = (char *)NULL;
			}
		'(' file_NAME_list ')'
	;

statement:
	  	assignment end
	|	CREATE_OBJECT_SYMBOLS
		{
 		lang_add_attribute(lang_object_symbols_statement_enum);
	      	}
        |	';'
        |	CONSTRUCTORS
		{

		  lang_add_attribute(lang_constructors_statement_enum);
		}
	| input_section_spec
        | length '(' exp ')'
        	        {
			lang_add_data((int) $1,$3);
			}

	| FILL '(' exp ')'
			{
			  lang_add_fill
			    (exp_get_value_int($3,
					       0,
					       "fill value",
					       lang_first_phase_enum));
			}
	;

statement_list:
		statement_list statement
  	|  	statement
	;

statement_list_opt:
		/* empty */
	|	statement_list
	;

length:
		QUAD
			{ $$ = $1; }
	|	LONG
			{ $$ = $1; }
	| 	SHORT
			{ $$ = $1; }
	|	BYTE
			{ $$ = $1; }
	;

fill_opt:
          '=' mustbe_exp
		{
		  $$ =	 exp_get_value_int($2,
					   0,
					   "fill value",
					   lang_first_phase_enum);
		}
	| 	{ $$ = 0; }
	;


assign_op:
		PLUSEQ
			{ $$ = '+'; }
	|	MINUSEQ
			{ $$ = '-'; }
	| 	MULTEQ
			{ $$ = '*'; }
	| 	DIVEQ
			{ $$ = '/'; }
	| 	LSHIFTEQ
			{ $$ = LSHIFT; }
	| 	RSHIFTEQ
			{ $$ = RSHIFT; }
	| 	ANDEQ
			{ $$ = '&'; }
	| 	OREQ
			{ $$ = '|'; }

	;

end:	';' | ','
	;


assignment:
		NAME '=' mustbe_exp
		{
		  lang_add_assignment (exp_assop ($2, $1, $3));
		}
	|	NAME assign_op mustbe_exp
		{
		  lang_add_assignment (exp_assop ('=', $1,
						  exp_binop ($2,
							     exp_nameop (NAME,
									 $1),
							     $3)));
		}
	|	PROVIDE '(' NAME '=' mustbe_exp ')'
		{
		  lang_add_assignment (exp_provide ($3, $5));
		}
	;


opt_comma:
		','	|	;


memory:
		MEMORY '{' memory_spec memory_spec_list '}'
	;

memory_spec_list:
		memory_spec_list memory_spec
	|	memory_spec_list ',' memory_spec
	|
	;


memory_spec: 		NAME
			{ region = lang_memory_region_lookup($1); }
		attributes_opt ':'
		origin_spec opt_comma length_spec

	; origin_spec:
	ORIGIN '=' mustbe_exp
		{ region->current =
		 region->origin =
		 exp_get_vma($3, 0L,"origin", lang_first_phase_enum);
}
	; length_spec:
             LENGTH '=' mustbe_exp
               { region->length = exp_get_vma($3,
					       ~((bfd_vma)0),
					       "length",
					       lang_first_phase_enum);
		}


attributes_opt:
		  '(' NAME ')'
			{
			lang_set_flags(&region->flags, $2);
			}
	|

	;

startup:
	STARTUP '(' filename ')'
		{ lang_startup($3); }
	;

high_level_library:
		HLL '(' high_level_library_NAME_list ')'
	|	HLL '(' ')'
			{ ldemul_hll((char *)NULL); }
	;

high_level_library_NAME_list:
		high_level_library_NAME_list opt_comma filename
			{ ldemul_hll($3); }
	|	filename
			{ ldemul_hll($1); }

	;

low_level_library:
	SYSLIB '(' low_level_library_NAME_list ')'
	; low_level_library_NAME_list:
		low_level_library_NAME_list opt_comma filename
			{ ldemul_syslib($3); }
	|
	;

floating_point_support:
		FLOAT
			{ lang_float(true); }
	|	NOFLOAT
			{ lang_float(false); }
	;


mustbe_exp:		 { ldlex_expression(); }
		exp
			 { ldlex_popstate(); $$=$2;}
	;

exp	:
		'-' exp %prec UNARY
			{ $$ = exp_unop('-', $2); }
	|	'(' exp ')'
			{ $$ = $2; }
	|	NEXT '(' exp ')' %prec UNARY
			{ $$ = exp_unop((int) $1,$3); }
	|	'!' exp %prec UNARY
			{ $$ = exp_unop('!', $2); }
	|	'+' exp %prec UNARY
			{ $$ = $2; }
	|	'~' exp %prec UNARY
			{ $$ = exp_unop('~', $2);}

	|	exp '*' exp
			{ $$ = exp_binop('*', $1, $3); }
	|	exp '/' exp
			{ $$ = exp_binop('/', $1, $3); }
	|	exp '%' exp
			{ $$ = exp_binop('%', $1, $3); }
	|	exp '+' exp
			{ $$ = exp_binop('+', $1, $3); }
	|	exp '-' exp
			{ $$ = exp_binop('-' , $1, $3); }
	|	exp LSHIFT exp
			{ $$ = exp_binop(LSHIFT , $1, $3); }
	|	exp RSHIFT exp
			{ $$ = exp_binop(RSHIFT , $1, $3); }
	|	exp EQ exp
			{ $$ = exp_binop(EQ , $1, $3); }
	|	exp NE exp
			{ $$ = exp_binop(NE , $1, $3); }
	|	exp LE exp
			{ $$ = exp_binop(LE , $1, $3); }
  	|	exp GE exp
			{ $$ = exp_binop(GE , $1, $3); }
	|	exp '<' exp
			{ $$ = exp_binop('<' , $1, $3); }
	|	exp '>' exp
			{ $$ = exp_binop('>' , $1, $3); }
	|	exp '&' exp
			{ $$ = exp_binop('&' , $1, $3); }
	|	exp '^' exp
			{ $$ = exp_binop('^' , $1, $3); }
	|	exp '|' exp
			{ $$ = exp_binop('|' , $1, $3); }
	|	exp '?' exp ':' exp
			{ $$ = exp_trinop('?' , $1, $3, $5); }
	|	exp ANDAND exp
			{ $$ = exp_binop(ANDAND , $1, $3); }
	|	exp OROR exp
			{ $$ = exp_binop(OROR , $1, $3); }
	|	DEFINED '(' NAME ')'
			{ $$ = exp_nameop(DEFINED, $3); }
	|	INT
			{ $$ = exp_intop($1); }
        |	SIZEOF_HEADERS
			{ $$ = exp_nameop(SIZEOF_HEADERS,0); }

	|	SIZEOF '(' NAME ')'
			{ $$ = exp_nameop(SIZEOF,$3); }
	|	ADDR '(' NAME ')'
			{ $$ = exp_nameop(ADDR,$3); }
	|	ABSOLUTE '(' exp ')'
			{ $$ = exp_unop(ABSOLUTE, $3); }
	|	ALIGN_K '(' exp ')'
			{ $$ = exp_unop(ALIGN_K,$3); }
	|	BLOCK '(' exp ')'
			{ $$ = exp_unop(ALIGN_K,$3); }
	|	NAME
			{ $$ = exp_nameop(NAME,$1); }
	;


opt_at:
		AT '(' exp ')' { $$ = $3; }
	|	{ $$ = 0; }
	;

section:	NAME 		{ ldlex_expression(); }
		opt_exp_with_type
		opt_at   	{ ldlex_popstate(); }
		'{'
			{
			lang_enter_output_section_statement($1,$3,typebits,0,0,0,$4);
			}
		statement_list_opt
 		'}' {ldlex_expression();} memspec_opt phdr_opt fill_opt
		{
		  ldlex_popstate();
		  lang_leave_output_section_statement($13, $11);
		}
		opt_comma
	;

type:
	   NOLOAD  { typebits = SEC_NEVER_LOAD; }
	|  DSECT   { typebits = 0; }
	|  COPY    { typebits = 0; }
	|  INFO    { typebits = 0; }
	|  OVERLAY { typebits = 0; }
	;

atype:
	 	'(' type ')'
  	| 	/* EMPTY */ { typebits = 0; }
	;


opt_exp_with_type:
		exp atype ':'		{ $$ = $1; ;}
	|	atype ':'		{ $$= (etree_type *)NULL;  }
	;

memspec_opt:
		'>' NAME
		{ $$ = $2; }
	|	{ $$ = "*default*"; }
	;

phdr_opt:
		/* empty */
	|	phdr_opt ':' NAME
		{
		  lang_section_in_phdr ($3);
		}
	;

phdrs:
		PHDRS '{' phdr_list '}'
	;

phdr_list:
		/* empty */
	|	phdr_list phdr
	;

phdr:
		NAME { ldlex_expression (); }
		  phdr_type phdr_qualifiers { ldlex_popstate (); }
		  ';'
		{
		  lang_new_phdr ($1, $3, $4.filehdr, $4.phdrs, $4.at,
				 $4.flags);
		}
	;

phdr_type:
		exp
		{
		  $$ = $1;

		  if ($1->type.node_class == etree_name
		      && $1->type.node_code == NAME)
		    {
		      const char *s;
		      unsigned int i;
		      static const char * const phdr_types[] =
			{
			  "PT_NULL", "PT_LOAD", "PT_DYNAMIC",
			  "PT_INTERP", "PT_NOTE", "PT_SHLIB",
			  "PT_PHDR"
			};

		      s = $1->name.name;
		      for (i = 0;
			   i < sizeof phdr_types / sizeof phdr_types[0];
			   i++)
			if (strcmp (s, phdr_types[i]) == 0)
			  {
			    $$ = exp_intop (i);
			    break;
			  }
		    }
		}
	;

phdr_qualifiers:
		/* empty */
		{
		  memset (&$$, 0, sizeof (struct phdr_info));
		}
	|	NAME phdr_val phdr_qualifiers
		{
		  $$ = $3;
		  if (strcmp ($1, "FILEHDR") == 0 && $2 == NULL)
		    $$.filehdr = true;
		  else if (strcmp ($1, "PHDRS") == 0 && $2 == NULL)
		    $$.phdrs = true;
		  else if (strcmp ($1, "FLAGS") == 0 && $2 != NULL)
		    $$.flags = $2;
		  else
		    einfo ("%X%P:%S: PHDRS syntax error at `%s'\n", $1);
		}
	|	AT '(' exp ')' phdr_qualifiers
		{
		  $$ = $5;
		  $$.at = $3;
		}
	;

phdr_val:
		/* empty */
		{
		  $$ = NULL;
		}
	| '(' exp ')'
		{
		  $$ = $2;
		}
	;

%%
void
yyerror(arg)
     const char *arg;
{
  if (ldfile_assumed_script)
    einfo ("%P:%s: file format not recognized; treating as linker script\n",
	   ldfile_input_filename);
  if (error_index > 0 && error_index < ERROR_NAME_MAX)
     einfo ("%P%F:%S: %s in %s\n", arg, error_names[error_index-1]);
  else
     einfo ("%P%F:%S: %s\n", arg);
}