Hash :
d89219a0
Author :
Date :
2017-06-08T18:57:07
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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
*
* 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
*
*/
/* **************************************************************************
*
* Process activity inside "Tokenizer Escape" mode.
*
* (C) Copyright 2005 IBM Corporation. All Rights Reserved.
* Module Author: David L. Paktor dlpaktor@us.ibm.com
*
**************************************************************************** */
/* **************************************************************************
*
* Functions Exported:
* init_tokz_esc_vocab Initialize the relevant vocabulary.
* enter_tokz_esc Enter "Tokenizer Escape" mode
* create_tokz_esc_alias Add an alias to "Tokenizer Escape" space
* reset_tokz_esc Reset the "Tokenizer Escape" Vocabulary
* to its "Built-In" position.
*
**************************************************************************** */
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "tokzesc.h"
#include "ticvocab.h"
#include "stack.h"
#include "emit.h"
#include "stream.h"
#include "scanner.h"
#include "errhandler.h"
#include "strsubvocab.h"
#include "nextfcode.h"
#include "tracesyms.h"
#undef TOKZTEST /* Define for testing only; else undef */
#ifdef TOKZTEST /* For testing only */
#include "vocabfuncts.h"
#include "date_stamp.h"
#endif /* For testing only */
/* **************************************************************************
*
* Global Variables Imported
* in_tokz_esc State of the tokenization operation.
* Value is FALSE if it's operating normally
* or TRUE if it's in "Tokenizer Escape" mode.
* nextfcode
* statbuf
* dstack Pointer to current item on top of Data Stack.
* base Current tokenizer numeric conversion radix
*
**************************************************************************** */
/* **************************************************************************
*
* We are going to implement a mini-forth using a strategy based
* on the concept of Threaded Interpretive Code (well, okay,
* it won't really be interpretive ... )
*
**************************************************************************** */
/* **************************************************************************
*
* Internal Static Variables -- (well, almost)
* tokz_esc_vocab Pointer to "tail" of "Tokenizer Escape" Vocab
*
* While we would prefer to keep tokz_esc_vocab private to this file,
* we find we need it in one other place, namely, macros.c
* We will declare it "extern" within that file, rather than
* exporting it widely by including it in a .h file
*
**************************************************************************** */
/* **************************************************************************
*
* We will define and initialize a structure consisting of all the
* functions we initially support for "Tokenizer Escape" mode,
* called tokz_esc_vocab_tbl for "Tokenizer Escape Vocab Table".
* I expect we can initialize its body, but I don't think there's a
* convenient way in "C" to initialize its links; we'll have to
* do that dynamically, at run-time. Oh, well...
*
* We'll call the pointer to it the "Tokenizer Escape" Vocabulary.
* We have to declare it here, because we need to refer to it in
* a function that will be entered into the Table.
*
* We would like to pre-initialize it; to do so, we would have to
* declare it extern here, then later create its instance and
* assign its initial value. That would be all well and good,
* except that some linkers don't handle that very well, so, to
* accommodate those, we have to include its initialization in
* the same routine where we initialize the Table's links.
*
* Revision History:
* Updated Wed, 04 Jan 2006 by David L. Paktor
* Initialization of tokz_esc_vocab is now included with
* the call to init_tic_vocab()
*
**************************************************************************** */
tic_hdr_t *tokz_esc_vocab = NULL ;
/* **************************************************************************
*
* We'll give short prologs to the simpler functions that will be
* used in the "Tokenizer Escape" Vocabulary.
*
* All these take, as an argument, the "parameter field" pointer.
* To satisfy C's strong-typing, it will always be declared
* of a consistent type. The routine itself can internally
* recast -- or ignore -- it, as needed.
* Many of these will refer to the Global Variable statbuf . It
* all such cases, it is used for Error reporting.
*
**************************************************************************** */
/* **************************************************************************
*
* Function name: enter_tokz_esc
* Synopsis: When you start "Tokenizer Escape" mode.
*
* Associated Tokenizer directive: TOKENIZER[
*
* Process Explanation:
* Enter "Tokenizer Escape" mode ... Save the current tokenizer
* numeric conversion radix, and set the radix to sixteen
* (hexadecimal)
*
**************************************************************************** */
static int saved_base ; /* Place to save the numeric conversion radix */
void enter_tokz_esc( void )
{
saved_base = base ;
base = 16;
in_tokz_esc = TRUE;
}
/* **************************************************************************
*
* Function name: end_tokz_esc
* Synopsis: When you've reached the end of "Tokenizer Escape" mode.
*
* Associated Tokenizer directive: ]TOKENIZER
*
* Process Explanation:
* Exit "Tokenizer Escape" mode, resume "Normal"-mode behavior.
* Restore the tokenizer numeric conversion radix to the value
* saved by tokenizer[ and exit "Tokenizer Escape" mode . . .
*
**************************************************************************** */
static void end_tokz_esc( tic_param_t pfield )
{
in_tokz_esc = FALSE;
base = saved_base ;
}
/* **************************************************************************
*
* Function name: tokz_esc_emit_byte
* Synopsis: Emit the byte found on the data-stack
*
* Associated Tokenizer directive: EMIT-BYTE
*
* Error Detection:
* If number on stack is larger than a byte: Truncate and Warn
*
**************************************************************************** */
static void tokz_esc_emit_byte ( tic_param_t pfield )
{
long num_on_stk = dpop();
u8 byt_to_emit = (u8)num_on_stk;
if ( byt_to_emit != num_on_stk )
{
tokenization_error( WARNING,
"Value on stack for %s command is 0x%0x. "
"Truncating to 0x%02x.\n",
strupr(statbuf), num_on_stk, byt_to_emit);
}
user_emit_byte(byt_to_emit);
}
/* **************************************************************************
*
* Function name: get_fcode_from_stack
* Synopsis: Retrieve an FCode value from the data-stack.
* Indicate if erroneous
*
* Inputs:
* Parameters:
* the_num Pointer to where to put the number
* setting_fc TRUE if number is to be set as next fcode,
* FALSE if the number is to be emitted
* Data-Stack Items:
* Top: Value to be retrieved
*
* Outputs:
* Returned Value: TRUE if number is within valid FCode range
* Supplied Pointers:
* *the_num Value retrieved from the data-stack
*
* Process Explanation:
* From the value of setting_fc we will deduce both the legal
* minimum and the phrase to be used in the ERROR message.
* If the number is to be emitted, it can be any legal FCode
* token number down to 0x10 but if it is to be set, the
* legal minimum is 0x0800.
* In either case, 0x0fff is the legal maximum.
*
* Error Detection:
* If the number on the stack is larger than 16 bits, truncate
* it, with a WARNING message.
* If the (possibly truncated) number taken from the stack is
* larger than the legal maximum for an FCode, or if it is
* less than the legal minimum, issue an ERROR message,
* leave the_num unchanged and return FALSE.
*
* Extraneous Remarks:
* If this function is ever used in more than the two ways allowed
* by the setting_fc parameter, then the Right Thing would
* be to define a local ENUM type for the possible uses, and
* use a SWITCH statement to set the internal variables. (But
* I really don't see any way that could become necessary...)
*
**************************************************************************** */
static bool get_fcode_from_stack( u16 *the_num, bool setting_fc)
{
bool retval = FALSE;
char *the_action = "emit FCode value of";
u16 legal_minimum = 0x10;
long num_on_stk = dpop();
u16 test_fcode = (u16)num_on_stk;
if ( setting_fc )
{
the_action = "set next fcode to";
legal_minimum = 0x800;
}
if ( test_fcode != num_on_stk )
{
tokenization_error( WARNING,
"Value on stack for %s command is 0x%0x. "
"Truncating to 0x%03x.\n",
strupr(statbuf), num_on_stk, test_fcode);
}
if ( ( test_fcode >= legal_minimum ) && ( test_fcode <= 0xfff ) )
{
retval = TRUE;
*the_num = test_fcode;
}else{ tokenization_error( TKERROR, "Attempt to %s "
"0x%x, which violates limit specified by IEEE-1275. "
"Disallowing.\n", the_action, test_fcode );
}
return( retval );
}
/* **************************************************************************
*
* Function name: tokz_esc_next_fcode
* Synopsis: Set the next-fcode to the value on the data-stack
*
* Associated Tokenizer Directive: next-fcode
*
* Error Detection:
* If the number on the stack is not legal for an FCode, as
* detected by get_fcode_from_stack(), issue an ERROR
* message and don't change nextfcode.
*
* Printout:
* Advisory showing change in FCode token Assignment Counter
*
**************************************************************************** */
static void tokz_esc_next_fcode( tic_param_t pfield )
{
u16 test_fcode;
if ( get_fcode_from_stack( &test_fcode, TRUE) )
{
if ( test_fcode == nextfcode )
{
tokenization_error( INFO, "FCode-token Assignment Counter "
"is unchanged from 0x%x.\n",
nextfcode);
}else{
tokenization_error( INFO, "FCode-token Assignment Counter "
"was 0x%x; has been %s to 0x%x.\n",
nextfcode,
test_fcode > nextfcode ? "advanced" : "reset",
test_fcode );
set_next_fcode( test_fcode);
}
}
}
/* **************************************************************************
*
* Function name: tokz_emit_fcode
* Synopsis: Emit the value on the data-stack as an FCode token
*
* Associated Tokenizer Directive: emit-fcode
*
* Error Detection:
* If the number on the stack is not legal for an FCode, as
* detected by get_fcode_from_stack(), issue an ERROR
* message and don't emit anything.
*
* Printout:
* Advisory showing FCode being emitted.
*
**************************************************************************** */
static void tokz_emit_fcode( tic_param_t pfield )
{
u16 test_fcode;
if ( get_fcode_from_stack( &test_fcode, FALSE) )
{
tokenization_error( INFO,
"Emitting FCode value of 0x%x\n", test_fcode);
emit_fcode( test_fcode);
}
}
/* **************************************************************************
*
* Function name: zero_equals
* Synopsis: Boolean-inversion of item on top of stack.
* If zero, make it minus-one; if non-zero, make it zero.
*
* Associated FORTH word-name: 0=
*
**************************************************************************** */
static void zero_equals ( tic_param_t pfield )
{
*dstack = (*dstack == 0) ? -1 : 0 ;
}
/* **************************************************************************
*
* Function name: tokz_esc_swap
* Synopsis: "Tokenizer Escape" mode-time data-stack SWAP operation
*
* Associated FORTH word-name: swap
*
**************************************************************************** */
static void tokz_esc_swap ( tic_param_t pfield )
{
swap();
}
/* **************************************************************************
*
* Function name: tokz_esc_two_swap
* Synopsis: "Tokenizer Escape" mode-time data-stack 2SWAP operation
*
* Associated FORTH word-name: 2swap
*
**************************************************************************** */
static void tokz_esc_two_swap ( tic_param_t pfield )
{
two_swap();
}
/* **************************************************************************
*
* Function name: tokz_esc_noop
* Synopsis: "Tokenizer Escape" mode-time non-operation
*
* Associated FORTH word-name: noop
*
**************************************************************************** */
static void tokz_esc_noop ( tic_param_t pfield )
{
return;
}
#ifdef TOKZTEST /* For testing only */
static void tokz_esc_emit_string( tic_param_t pfield )
{
int lenny ;
lenny = strlen ( pfield.chr_ptr );
emit_token("b(\")");
emit_string(pfield.chr_ptr, lenny);
}
#endif /* For testing only */
/* **************************************************************************
*
* Function name: do_constant
* Synopsis: The function to perform when a named constant
* that was defined in "Tokenizer Escape" mode
* is invoked in "Tokenizer Escape" mode
*
* Associated FORTH word: A user-defined constant
*
* Inputs:
* Parameters:
* The param-field of the table-entry contains
* the value of the constant
*
* Outputs:
* Returned Value: NONE
* Items Pushed onto Data-Stack:
* Top: The table-entry's param-field's value
*
* Error Detection:
* An attempt, while operating in normal tokenization mode, to invoke
* a named constant that was defined in "Tokenizer Escape" mode
* will be detected by the main scanning loop, and need not
* concern us here.
*
**************************************************************************** */
static void do_constant ( tic_param_t pfield )
{
dpush( pfield.long_val );
}
/* **************************************************************************
*
* Function name: create_constant
* Synopsis: Create a user-defined constant that will be
* recognized in "Tokenizer Escape" mode
*
* Associated FORTH word-name: CONSTANT (when issued
* in "Tokenizer Escape" mode)
*
* Inputs:
* Parameters: NONE
* Global Variables:
* statbuf The constant's name will be taken from the
* next word in the input stream.
* do_constant The function assigned to the definition
* tokz_esc_vocab The "Tokenizer Escape" Vocabulary pointer
* Data-Stack Items:
* Top: The constant's value is popped from the stack
*
* Outputs:
* Returned Value: NONE
* Global Variables:
* statbuf Advanced to the next word in the input stream.
* tokz_esc_vocab Updated to point to new vocab entry.
* Memory Allocated:
* for the name and for the new entry.
* When Freed?
* When RESET-SYMBOLS is issued in "Tokenizer Escape" mode,
* or upon end of tokenization.
* Data-Stack, # of Items Popped: 1
*
* Error Detection:
* Failure to allocate memory is a Fatal Error.
* Warning on excessively long name
* Name to be defined not in same file, ERROR
* Warning on duplicate name handled by support routine
*
* Process Explanation:
* Get the next word, STRDUP it (which implicitly allocates memory).
* Get the number popped off the stack.
* Pass the pointer and the value to the add_tic_entry() routine.
*
**************************************************************************** */
static void create_constant( tic_param_t pfield )
{
char *c_name_space ; /* Space for copy of the name */
long valu ; /* Value, popped off the stack */
signed long wlen;
/* Get the name that is to be defined */
wlen = get_word();
if ( wlen <= 0 )
{
warn_unterm( TKERROR, "Constant definition", lineno);
return;
}
valu = dpop();
/* If ever we implement more than just this one
* defining-word in "Tokenizer Escape" mode,
* the lines from here to the end of the
* routine should be re-factored...
*/
c_name_space = strdup( statbuf );
add_tic_entry(
c_name_space,
do_constant,
(TIC_P_DEFLT_TYPE)valu,
CONST ,
0 , FALSE , NULL,
&tokz_esc_vocab );
check_name_length( wlen );
}
/* **************************************************************************
*
* Let's create usable named constants for "Tokenizer Escape" mode.
* It's useful, it's easy and ... well, you get the idea.
*
**************************************************************************** */
/* I don't think we need to any more
static const int zero = 0 ;
static const int minus_one = -1 ;
static const char double_quote = '"' ;
static const char close_paren = ')' ;
* Except for this next one, of course... */
#ifdef TOKZTEST /* For testing only */
static const char date_me[] = DATE_STAMP;
#endif /* For testing only */
/* **************************************************************************
*
* Here, at long last, we define and initialize the structure containing
* all the functions we support in "Tokenizer Escape" mode.
* Let's call it the "Tokenizer Escape Vocabulary Table" and the
* pointer to it, the "Tokenizer Escape" Vocabulary.
* We can initialize the start of the "Tokenizer Escape" Vocabulary
* easily, except for the link-pointers, as an array.
*
**************************************************************************** */
#define TKZESC_CONST(nam, pval) \
VALPARAM_TIC(nam, do_constant, pval, CONST, FALSE )
#define TKZ_ESC_FUNC(nam, afunc, pval, ifunc) \
DUALFUNC_TIC(nam, afunc, pval, ifunc, UNSPECIFIED)
static tic_hdr_t tokz_esc_vocab_tbl[] = {
NO_PARAM_IGN( "]tokenizer" , end_tokz_esc ) ,
/* An IBM-ish synonym. */
NO_PARAM_IGN( "f]" , end_tokz_esc ) ,
/* An alternate synonym. */
NO_PARAM_IGN( "]f" , end_tokz_esc ) ,
NO_PARAM_TIC( "emit-byte" , tokz_esc_emit_byte ) ,
NO_PARAM_TIC( "next-fcode" , tokz_esc_next_fcode ) ,
NO_PARAM_TIC( "emit-fcode" , tokz_emit_fcode ) ,
NO_PARAM_TIC( "constant" , create_constant ) ,
NO_PARAM_TIC( "0=" , zero_equals ) ,
NO_PARAM_TIC( "swap" , tokz_esc_swap ) ,
NO_PARAM_TIC( "2swap" , tokz_esc_two_swap ) ,
NO_PARAM_TIC( "noop" , tokz_esc_noop ) ,
TKZESC_CONST( "false" , 0 ) ,
TKZESC_CONST( "true" , -1 ) ,
TKZ_ESC_FUNC( ".(" , user_message, ')', skip_user_message ) ,
TKZ_ESC_FUNC( ".\"" , user_message, '"', skip_user_message ) ,
#ifdef TOKZTEST /* For testing only */
/* Data is a pointer to a constant string in the compiler; */
/* no need to copy, hence data_size can remain zero. */
/* We could almost use the Macro macro, except for the type. */
TKZ_ESC_FUNC( "emit-date" , tokz_esc_emit_string, date_me , NULL ) ,
#endif /* For testing only */
};
/* **************************************************************************
*
* Also, keep a pointer to the "Built-In" position of
* the "Tokenizer Escape" Vocabulary
*
**************************************************************************** */
static const tic_hdr_t *built_in_tokz_esc =
&tokz_esc_vocab_tbl[(sizeof(tokz_esc_vocab_tbl)/sizeof(tic_hdr_t))-1];
/* **************************************************************************
*
* Function name: init_tokz_esc_vocab
* Synopsis: Initialize the "Tokenizer Escape" Vocabulary
* link-pointers dynamically.
*
* Process Explanation:
* While this is going on, set in_tokz_esc to TRUE; clear it
* when done. This will be used by the trace_builtin
* routine...
*
**************************************************************************** */
void init_tokz_esc_vocab ( void )
{
static const int tokz_esc_vocab_max_indx =
sizeof(tokz_esc_vocab_tbl)/sizeof(tic_hdr_t) ;
in_tokz_esc = TRUE;
tokz_esc_vocab = NULL ; /* Belt-and-suspenders... */
init_tic_vocab(tokz_esc_vocab_tbl,
tokz_esc_vocab_max_indx,
&tokz_esc_vocab );
in_tokz_esc = FALSE;
}
/* **************************************************************************
*
* Function name: lookup_tokz_esc
* Synopsis: Return a pointer to the data-structure of the named
* word in the"Tokenizer Escape" Vocabulary
*
* Inputs:
* Parameters:
* name The given name for which to look
* Local Static Variables:
* tokz_esc_vocab Pointer to "Tokenizer Escape" Vocabulary
*
* Outputs:
* Returned Value: TRUE if name is found,
*
**************************************************************************** */
tic_hdr_t *lookup_tokz_esc(char *name)
{
tic_hdr_t *retval = lookup_tic_entry( name, tokz_esc_vocab );
return ( retval );
}
/* **************************************************************************
*
* Function name: create_tokz_esc_alias
* Synopsis: Create an alias in the "Tokenizer Escape" Vocabulary
*
* Associated FORTH word: ALIAS (in "Tokenizer Escape" mode)
*
* Inputs:
* Parameters:
* old_name Name of existing entry
* new_name New name for which to create an entry
*
* Outputs:
* Returned Value: TRUE if old_name found in "Tok Esc" vocab
* Global Variables:
* tokz_esc_vocab Will point to the new entry
* Memory Allocated:
* Memory for the new entry will be allocated
* by the support routine
* When Freed?
* When RESET-SYMBOLS is issued in "Tokenizer Escape" mode,
* or upon end of tokenization.
*
**************************************************************************** */
bool create_tokz_esc_alias(char *new_name, char *old_name)
{
bool retval = create_tic_alias( new_name, old_name, &tokz_esc_vocab );
return ( retval );
}
/* **************************************************************************
*
* Function name: reset_tokz_esc
* Synopsis: Reset the "Tokenizer Escape" Vocabulary to
* its "Built-In" position.
*
* Associated Tokenizer directive: RESET-SYMBOLS (when issued
* in "Tokenizer Escape" mode)
*
* Inputs:
* Parameters: NONE
* Global Variables:
* tokz_esc_vocab Pointer to "Tokenizer Escape" Vocabulary
* built_in_tokz_esc Pointer to "Built-In" position
*
* Outputs:
* Returned Value: NONE
* Global Variables:
* tokz_esc_vocab Reset to "Built-In" position
* Memory Freed
* Memory will be freed by the support routine
*
**************************************************************************** */
void reset_tokz_esc( void )
{
reset_tic_vocab( &tokz_esc_vocab, (tic_hdr_t *)built_in_tokz_esc);
}
/* **************************************************************************
*
* Function name: pop_next_fcode
* Synopsis: Vector off to the tokz_esc_next_fcode function,
* but without the pseudo-param. A retro-fit...
*
* Associated Tokenizer directive: FCODE-POP (issued in either mode)
*
* Inputs:
* Parameters: NONE
* Data-Stack Items:
* Top: Next FCode value, presumably saved
* by an FCODE-PUSH issued earlier.
*
* Outputs:
* Returned Value:
* Global Variables:
* nextfcode FCode token Assignment Counter
*
**************************************************************************** */
void pop_next_fcode( void)
{
tic_param_t dummy_param;
tokz_esc_next_fcode( dummy_param);
}