Hash :
76f2e7bb
Author :
Date :
2010-04-26T15:57:21
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/*
* OpenBIOS - free your system!
* ( FCode tokenizer )
*
* This program is part of a free implementation of the IEEE 1275-1994
* Standard for Boot (Initialization Configuration) Firmware.
*
* Copyright (C) 2001-2010 Stefan Reinauer <stepan@openbios.org>
*
* 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; version 2 of the License.
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
*
*/
/* **************************************************************************
*
* Conditional-Compilation support for Tokenizer
*
* (C) Copyright 2005 IBM Corporation. All Rights Reserved.
* Module Author: David L. Paktor dlpaktor@us.ibm.com
*
**************************************************************************** */
/* **************************************************************************
*
* Functions Exported:
* init_conditionals_vocab Initialize the "Conditionals" Vocabulary.
* handle_conditional Confirm whether a given name is a valid
* Conditional, and, if so, perform its
* function and return an indication.
* create_conditional_alias Add an alias to "Conditionals" vocab
* reset_conditionals Reset the "Conditionals" Vocabulary
* to its "Built-In" position.
*
**************************************************************************** */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "scanner.h"
#include "errhandler.h"
#include "ticvocab.h"
#include "conditl.h"
#include "stack.h"
#include "dictionary.h"
#include "vocabfuncts.h"
#include "usersymbols.h"
#include "stream.h"
#include "clflags.h"
/* **************************************************************************
*
* Global Variables Imported
* statbuf Start of input-source buffer
* pc Input-source Scanning pointer
* iname Current Input File name
* lineno Current Line Number in Input File
*
**************************************************************************** */
/* **************************************************************************
*
* Local Static Variables
* already_ignoring Location from which to pass a parameter,
* called "alr_ign" to the main routine. Each
* "Conditional" will have an associated routine
* that takes the pointer to this as its argument.
* The pointer to this will satisfy the "param-field"
* requirement of a TIC_HDR-style "Vocabulary"-list.
* conditionals_tbl TIC_HDR-style "Vocabulary"-list table, initialized
* as an array.
* conditionals Pointer to "tail" of Conditionals Vocabulary-list
*
**************************************************************************** */
/* **************************************************************************
*
* The lists of synonymous forms of the #ELSE and #THEN operators
* are incorporated into the "Shared Words" Vocabulary.
*
**************************************************************************** */
/* **************************************************************************
*
* Function name: is_a_then / is_an_else
* Synopsis: Indicate whether the given name is one of the
* [then] / [else] synonyms
*
* Inputs:
* Parameters:
* a_word Word to test
*
* Outputs:
* Returned Value: TRUE if the given name is one of the synonyms
*
* Process Explanation:
* The functions are twins, hence bundling them like this...
*
**************************************************************************** */
/* **************************************************************************
*
* Support function: is_a_type
* Synopsis: Indicate whether the given name is a "shared word"
* whose FWord Token matches the one given
*
* Inputs:
* Parameters:
* tname Target name to look for
* fw_type The FWord Token type to match
*
* Outputs:
* Returned Value: TRUE if it matches
*
**************************************************************************** */
static bool is_a_type( char *tname, fwtoken fw_type)
{
bool retval = FALSE;
tic_fwt_hdr_t *found = (tic_fwt_hdr_t *)lookup_shared_f_exec_word( tname );
if ( found != NULL )
{
if ( found->pfield.fw_token == fw_type ) retval = TRUE;
}
return ( retval );
}
static bool is_a_then( char *a_word)
{
bool retval = is_a_type( a_word, CONDL_ENDER);
return ( retval );
}
static bool is_an_else( char *a_word)
{
bool retval = is_a_type( a_word, CONDL_ELSE);
return ( retval );
}
/* **************************************************************************
*
* This is a somewhat roundabout way of passing an "already ignoring"
* parameter to the various Conditional Operators. Each operator's
* Parameter-Field Pointer points to this. The calling routine
* must set it (or rely on the default); the routine that handles
* nesting of Conditionals must save and restore a local copy.
*
**************************************************************************** */
static bool already_ignoring = FALSE;
/* **************************************************************************
*
* Further down, will define and initialize a word-list table with
* all the functions that implement the Conditional Operators,
* and we'll link it in with the "Global Vocabulary" pointer.
*
* We'll call the word-list the "Conditionals Vocabulary Table",
* and refer to its entries as the "Conditionals Vocabulary",
* even though it isn't really a separate vocabulary...
*
**************************************************************************** */
/* **************************************************************************
*
* We also need a few common routines to pass as "Ignoring" functions
* for a few occasional words that take another word or two from
* the input stream as their arguments. For example, if the user
* were to write: alias [otherwise] [else] and that were to
* occur within a segment already being ignored, we need to make
* sure that this doesn't get processed as an occurrence of [else]
* Similarly with macro-definitions.
*
* Since we are using the term "ignore a word" to mean "look it up and
* process it in Ignoring-state", we need a different term to name
* this class of routine; let's use the term "skip a word" where
* the "word" is strictly an input token, delimited by whitespace.
*
**************************************************************************** */
/* **************************************************************************
*
* Function name: skip_a_word
* Synopsis: Consume one input-token ("word") from the
* Input Stream, with no processing
*
* Inputs:
* Parameters:
* pfield "Parameter field" pointer, to satisfy
* the calling convention, but not used
*
* Outputs:
* Returned Value: NONE
*
**************************************************************************** */
void skip_a_word( tic_bool_param_t pfield )
{
/* signed long wlen = */ get_word();
}
/* **************************************************************************
*
* Function name: skip_a_word_in_line
* Synopsis: Consume one input-token ("word") on the same line
* as the current line of input, from the Input
* Stream, with no processing.
*
* Inputs:
* Parameters:
* pfield "Parameter field" pointer, to satisfy
* the calling convention, but not used
* Global Variables:
* statbuf The word being processed, which expects
* another word on the same line; used
* for the Error message.
*
* Outputs:
* Returned Value: NONE
*
* Error Detection:
* get_word_in_line() will check and report if no word on same line.
*
**************************************************************************** */
void skip_a_word_in_line( tic_bool_param_t pfield )
{
/* bool isokay = */ get_word_in_line( statbuf);
}
/* **************************************************************************
*
* Function name: skip_two_words_in_line
* Synopsis: Consume two input-tokens ("words") on the same line
* as the current line of input, from the Input
* Stream, with no processing.
*
* Inputs:
* Parameters:
* pfield "Parameter field" pointer, to satisfy
* the calling convention, but not used
* Global Variables:
* statbuf The word being processed, which expects
* two words on the same line; used for
* the Error message.
*
* Outputs:
* Returned Value: NONE
* Memory Allocated
* Copy of statbuf for Error message.
* When Freed?
* End of this routine
*
* Error Detection:
* get_word_in_line() will check and report
*
**************************************************************************** */
void skip_two_words_in_line( tic_bool_param_t pfield )
{
char *func_cpy = strupr( strdup( statbuf));
if ( get_word_in_line( func_cpy) )
{
/* bool isokay = */ get_word_in_line( func_cpy);
}
free( func_cpy);
}
/* **************************************************************************
*
* Function name: ignore_one_word
* Synopsis: Handle a word that needs processing while "ignoring"
* Ignore the rest.
*
* Inputs:
* Parameters:
* tname Target name to test
* Local Static Variables:
* already_ignoring The "Already Ignoring" flag
*
* Outputs:
* Returned Value: NONE
* Global Variables:
* tic_found Set to the TIC-entry that has just been
* found, in case it's a Macro.
* Local Static Variables:
* already_ignoring Intermediately set to TRUE, then
* returned to former state.
*
* Process Explanation:
* When we are ignoring source input, we still need to be
* sensitive to the nesting of Conditional Operators, to
* consume comments and user -message text-bodies, and to
* expand Macros, among other things.
* Rather than create special cases here for each one, we have
* added an "ign_funct" pointer to those words where this
* is relevant, including Conditional Operators.
* Save the state of already_ignoring and set it to TRUE
* Execute the "Ignoring" Function associated with the entry
* Restore already_ignoring to its previous state.
* This is necessary if the word is a Conditional Operator and
* is harmless otherwise.
*
**************************************************************************** */
static void ignore_one_word( char *tname)
{
tic_bool_hdr_t *found = (tic_bool_hdr_t *)lookup_word( tname, NULL, NULL);
if ( found != NULL )
{
if ( found->ign_func != NULL )
{
bool save_already_ignoring = already_ignoring;
already_ignoring = TRUE ;
tic_found = (tic_hdr_t *)found;
found->ign_func( found->pfield);
already_ignoring = save_already_ignoring;
}
}
}
/* **************************************************************************
*
* Function name: conditionally_tokenize
* Synopsis: Conduct tokenization while a Conditional-Tokenization
* operator is in effect. This is the core of the
* implementation of Conditional-Tokenization.
*
* Inputs:
* Parameters:
* cond The state of the Condition-Flag that the
* immediate Conditional Operator acquired.
* TRUE means "do not ignore". Its sense
* is reversed when [ELSE] is encountered.
* alr_ign TRUE means we are Already Ignoring source input,
* except for Conditional Operators...
* Global Variables:
* statbuf The symbol (word) just retrieved from input stream.
* iname Current Input File name (for Error Messages)
* lineno Current Line Number in Input File (ditto)
* trace_conditionals Whether to issue ADVISORY messages about
* the state of Conditional Tokenization.
*
* Outputs:
* Returned Value: NONE
* Global Variables:
* statbuf Will be advanced to the balancing [THEN] op'r.
* already_ignoring Set to TRUE if nested Conditional encountered;
* restored to previous state when done.
* Memory Allocated
* Duplicate of Input File name, for Error Messages
* When Freed?
* Just prior to exit from routine.
* Printout:
* ADVISORY messages, if "Trace-Conditionals" flag was selected.
*
* Global Behavior:
* Tokenization happens, or inputs are ignored, as necessary.
*
* Error Detection:
* End-of-file encountered on reading a word
* ERROR. Conditional Operators must be balanced within a file
* More than one [ELSE] encountered: ERROR if processing segment;
* if ignoring, WARNING.
*
* Process Explanation:
* Read a word at a time. Allow Macros to "pop" transparently,
* but not source files.
* If the word is a [THEN], we are done.
* If the word is an [ELSE], then, if we are not Already Ignoring,
* invert the sense of whether we are ignoring source input.
* If this is not the only [ELSE] in the block, report an Error
* and disregard it.
* If we are ignoring source input, for whatever reason, we still
* need to be sensitive to the nesting of Conditional Operators:
* If the word is a Conditional Operator, activate it with the
* "Already Ignoring" parameter set to TRUE; doing so will
* result in a nested call to this routine.
* Otherwise, i.e., if the word is not a Conditional Operator,
* we may still need to process it in "ignoring" mode:
* we need, for instance, to consume strings, comments
* and the text-bodies of user-messages in their entirety,
* in case there is a reference to an [ELSE] or suchlike.
* The words that need processing while "ignoring" will
* have a valid function-pointer in their ign_func field.
* If we are not ignoring source input, pass the word along to the
* tokenize_one_word routine and process it. If the word is
* a Conditional Operator, it will be handled in the context
* of normal (i.e., non-ignored) tokenization, and, again, a
* nested call to this routine will result...
*
* Revision History:
* Updated Thu, 23 Feb 2006 by David L. Paktor
* Conditional Blocks may begin with a Conditional Operator in
* a Macro definition and do not need to be concluded in
* the body of the Macro.
* Updated Fri, 10 Mar 2006 by David L. Paktor
* Recognize aliased string, comment and user-message delimiters
* in a segment that is being ignored; Conditional Operators
* within the text body of any of these are always consumed
* and never unintentionally processed. Macros are always
* processed; Conditional Operators inside a Macro body are
* recognized, so the Macro continues to function as intended.
*
**************************************************************************** */
static void conditionally_tokenize( bool cond, bool alr_ign )
{
signed long wlen;
/* Note: The following variables *must* remain within
* the scope of this routine; a distinct instance
* is needed each time this routine is re-entered
* (aka "a nested call").
*/
bool ignoring;
bool first_else = TRUE; /* The "else" we see is the first. */
bool not_done = TRUE;
unsigned int cond_strt_lineno = lineno;
char *cond_strt_ifile_nam = strdup( iname);
ignoring = BOOLVAL( ( cond == FALSE ) || ( alr_ign != FALSE ) );
if ( trace_conditionals )
{
char *cond_val = cond ? "True" : "False" ;
char *cond_junct = alr_ign ? ", but Already " : "; ";
char *processg = ignoring ? "Ignoring" : "Processing" ;
tokenization_error( INFO,
"Tokenization-Condition is %s%s%s.\n",
cond_val, cond_junct, processg);
}
while ( not_done )
{
wlen = get_word();
if ( wlen == 0 )
{
continue;
}
if ( wlen < 0 )
{
tokenization_error( TKERROR,
"Conditional without conclusion; started");
just_where_started( cond_strt_ifile_nam, cond_strt_lineno);
not_done = FALSE ;
continue;
}
if ( is_a_then ( statbuf ) )
{
if ( trace_conditionals )
{
tokenization_error( INFO,
"Concluding Conditional");
just_started_at( cond_strt_ifile_nam, cond_strt_lineno);
}
not_done = FALSE ;
continue;
}
if ( is_an_else( statbuf ) )
{
if ( ! alr_ign )
{
if ( first_else )
{
ignoring = INVERSE( ignoring);
}
}
if ( ! first_else )
{
int severity = ignoring ? WARNING : TKERROR ;
char *the_scop = ignoring ? "(ignored)" : "the" ;
tokenization_error( severity, "Multiple %s directives "
"within %s scope of the Conditional",
strupr(statbuf), the_scop);
just_started_at( cond_strt_ifile_nam, cond_strt_lineno);
}else{
first_else = FALSE;
if ( trace_conditionals )
{
char *when_enc = alr_ign ? "While already" : "Now" ;
char *processg = alr_ign ? "ignoring" :
ignoring ? "Ignoring" : "Processing" ;
char *enc = alr_ign ? ", e" : ". E" ;
tokenization_error( INFO,
"%s %s%sncountered %s belonging to Conditional",
when_enc, processg, enc, strupr(statbuf) );
just_started_at( cond_strt_ifile_nam, cond_strt_lineno);
}
}
continue;
}
/* If we are ignoring source input, for whatever reason, we still
* need to be sensitive to the nesting of Conditional Operators
* and some other commands and directives, as indicated...
*/
if ( ignoring )
{
ignore_one_word( statbuf );
}else{
/* And if we're not ignoring source input, process it! */
tokenize_one_word ( wlen );
}
}
}
/* **************************************************************************
*
* We will now define a series of fairly simple functions that
* will be performed by the various Conditional Operators in
* the "Conditionals Vocabulary".
*
* Each one takes, as an argument, the "parameter field" pointer,
* which, in all cases, points to the local already_ignoring
* flag, passed as an int to satisfy C's strong-typing. The
* routine will internally recast it as a bool .
*
* If it is TRUE, the routine will bypass the test for its particular
* type of condition, and go directly to conditionally_tokenize
* In most cases, testing for the condition would be harmless,
* but in the case where the test is for an item on the stack,
* it would be harmful because the sequence that put the item
* on the stack was also being ignored...
*
* We'll give these functions short prologs. Synonyms will simply
* have separate entries in the Vocabulary Table, associated
* with the same function.
*
**************************************************************************** */
/* **************************************************************************
*
* But first, a support routine...
*
**************************************************************************** */
/* **************************************************************************
*
* Function name: conditional_word_in_line
* Synopsis: Common code for the types of conditionals that
* require a word on the same line.
*
* Inputs:
* Parameters:
* alr_ign TRUE if we are already ignoring
* exist_test TRUE if the test is for "existence" of the word
* exist_funct Name of the function to call for the test
* Global Variables:
* stat_word Word for which to test
*
* Outputs:
* Returned Value: NONE
*
* Error Detection:
* The word in question must appear on the same line as the directive;
* the call to get_word_in_line() checks for that and reports.
* If the word did not appear on the same line, then the directive
* will be disregarded and processing will proceed as though it
* were absent. This may lead to a cascade of errors...
*
* Process Explanation:
* The supplied exist_funct() will test for the existence of
* the word, now read into statbuf , in the appropriate
* venue.
* We only call the exist_funct() if we are not already ignoring.
*
**************************************************************************** */
static void conditional_word_in_line( bool alr_ign,
bool exist_test,
bool (*exist_funct)() )
{
if ( get_word_in_line( statbuf) )
{
bool cond = FALSE;
if ( INVERSE( alr_ign) )
{
bool exists = exist_funct( statbuf);
cond = BOOLVAL( exists == exist_test);
}
conditionally_tokenize( cond, alr_ign );
}
}
/* **************************************************************************
*
* Function name: if_exists
* Synopsis: Test for existence of a given word, in the dictionary.
*
* Associated Tokenizer directives: [ifexist]
* #ifexist
* [#ifexist]
* [ifexists]
* #ifexists
* [#ifexists]
* (Note variants with and without final 's'
*
**************************************************************************** */
static void if_exists( tic_param_t pfield )
{
bool alr_ign = *pfield.bool_ptr;
conditional_word_in_line( alr_ign, TRUE, exists_in_current );
}
/* **************************************************************************
*
* Function name: if_not_exist
* Synopsis: Test for Non-existence, in the appropriate dictionary,)
* of the given word.
*
* Associated Tokenizer directives: [ifnexist]
* #ifnexist
* [#ifnexist]
* (Note: Variants with final 's' didn't make sense here.)
*
* Explanatory Notes:
* This is the exact inverse of if_exists
*
**************************************************************************** */
static void if_not_exist( tic_bool_param_t pfield )
{
bool alr_ign = *pfield.bool_ptr;
conditional_word_in_line( alr_ign, FALSE, exists_in_current );
}
/* **************************************************************************
*
* Function name: if_defined
* Synopsis: Test for existence of a user-defined symbol
*
* Associated Tokenizer directives: [ifdef]
* #ifdef
* [#ifdef]
*
**************************************************************************** */
static void if_defined( tic_bool_param_t pfield )
{
bool alr_ign = *pfield.bool_ptr;
conditional_word_in_line( alr_ign, TRUE, exists_as_user_symbol );
}
/* **************************************************************************
*
* Function name: if_not_defined
* Synopsis: Test for NON-existence of a user-defined symbol
*
* Associated Tokenizer directives: [ifndef]
* #ifndef
* [#ifndef]
*
**************************************************************************** */
static void if_not_defined( tic_bool_param_t pfield )
{
bool alr_ign = *pfield.bool_ptr;
conditional_word_in_line( alr_ign, FALSE, exists_as_user_symbol );
}
/* **************************************************************************
*
* Function name: if_from_stack
* Synopsis: Test the number on top of the run-time stack
*
* Associated Tokenizer directive: [if]
*
* Process Explanation:
* When we are ignoring source input, and we still need to be
* sensitive to the nesting of Conditional Operators, we
* will not consume the number on the stack; this function
* is after all, being ignored and should not perform any
* action other than making sure the [else]s and [then]s
* get properly counted.
*
**************************************************************************** */
static void if_from_stack( tic_bool_param_t pfield )
{
bool alr_ign = *pfield.bool_ptr;
bool cond = FALSE;
if ( ! alr_ign )
{
long num = dpop();
if (num != 0)
{
cond = TRUE;
}
}
conditionally_tokenize( cond, alr_ign );
}
/* For future functions, use conditl.BlankTemplate.c */
/* **************************************************************************
*
* Here, at long last, we define and initialize the structure containing
* all the functions we support for Conditional Operators.
*
**************************************************************************** */
#define ADD_CONDL(str, func ) BUILTIN_BOOL_TIC(str, func, already_ignoring )
static tic_bool_hdr_t conditionals_vocab_tbl[] = {
ADD_CONDL ("[ifexist]" , if_exists ) ,
ADD_CONDL ("[ifexists]" , if_exists ) ,
ADD_CONDL ("#ifexist" , if_exists ) ,
ADD_CONDL ("#ifexists" , if_exists ) ,
ADD_CONDL ("[#ifexist]" , if_exists ) ,
ADD_CONDL ("[#ifexists]" , if_exists ) ,
ADD_CONDL ("[ifnexist]" , if_not_exist ) ,
ADD_CONDL ("#ifnexist" , if_not_exist ) ,
ADD_CONDL ("[#ifnexist]" , if_not_exist ) ,
ADD_CONDL ("[ifdef]" , if_defined ) ,
ADD_CONDL ("#ifdef" , if_defined ) ,
ADD_CONDL ("[#ifdef]" , if_defined ) ,
ADD_CONDL ("[ifndef]" , if_not_defined ) ,
ADD_CONDL ("#ifndef" , if_not_defined ) ,
ADD_CONDL ("[#ifndef]" , if_not_defined ) ,
ADD_CONDL ("[if]" , if_from_stack )
};
/* **************************************************************************
*
* Function name: init_conditionals_vocab
* Synopsis: Initialize the "Conditionals Vocabulary Table"
* link-pointers dynamically, and link it in
* with the given ("Global") Vocabulary pointer.
*
**************************************************************************** */
void init_conditionals_vocab( tic_hdr_t **tic_vocab_ptr )
{
static const int conditionals_vocab_max_indx =
sizeof(conditionals_vocab_tbl)/sizeof(tic_bool_hdr_t);
init_tic_vocab( (tic_hdr_t *)conditionals_vocab_tbl,
conditionals_vocab_max_indx,
tic_vocab_ptr );
}