784 lines
17 KiB
C
Executable File
784 lines
17 KiB
C
Executable File
/* execute.c - run a bc program. */
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/* This file is part of bc written for MINIX.
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Copyright (C) 1991, 1992 Free Software Foundation, Inc.
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This program 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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This program 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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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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You may contact the author by:
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e-mail: phil@cs.wwu.edu
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us-mail: Philip A. Nelson
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Computer Science Department, 9062
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Western Washington University
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Bellingham, WA 98226-9062
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*************************************************************************/
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#include "bcdefs.h"
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#include <signal.h>
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#include "global.h"
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#include "proto.h"
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/* The SIGINT interrupt handling routine. */
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int had_sigint;
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void
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stop_execution (sig)
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int sig;
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{
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had_sigint = TRUE;
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printf ("\n");
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rt_error ("interrupted execution");
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}
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/* Get the current byte and advance the PC counter. */
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unsigned char
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byte (pc)
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program_counter *pc;
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{
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int seg, offset;
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seg = pc->pc_addr >> BC_SEG_LOG;
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offset = pc->pc_addr++ % BC_SEG_SIZE;
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return (functions[pc->pc_func].f_body[seg][offset]);
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}
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/* The routine that actually runs the machine. */
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void
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execute ()
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{
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int label_num, l_gp, l_off;
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bc_label_group *gp;
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char inst, ch;
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int new_func;
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int var_name;
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int const_base;
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bc_num temp_num;
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arg_list *auto_list;
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/* Initialize this run... */
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pc.pc_func = 0;
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pc.pc_addr = 0;
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runtime_error = FALSE;
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init_num (&temp_num);
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/* Set up the interrupt mechanism for an interactive session. */
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if (interactive)
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{
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signal (SIGINT, stop_execution);
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had_sigint = FALSE;
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}
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while (pc.pc_addr < functions[pc.pc_func].f_code_size && !runtime_error)
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{
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inst = byte(&pc);
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#if DEBUG > 3
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{ /* Print out address and the stack before each instruction.*/
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int depth; estack_rec *temp = ex_stack;
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printf ("func=%d addr=%d inst=%c\n",pc.pc_func, pc.pc_addr, inst);
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if (temp == NULL) printf ("empty stack.\n", inst);
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else
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{
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depth = 1;
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while (temp != NULL)
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{
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printf (" %d = ", depth);
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out_num (temp->s_num, 10, out_char);
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depth++;
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temp = temp->s_next;
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}
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}
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}
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#endif
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switch ( inst )
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{
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case 'A' : /* increment array variable (Add one). */
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var_name = byte(&pc);
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if ((var_name & 0x80) != 0)
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var_name = ((var_name << 8) & 0x7f) + byte(&pc);
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incr_array (var_name);
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break;
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case 'B' : /* Branch to a label if TOS != 0. Remove value on TOS. */
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case 'Z' : /* Branch to a label if TOS == 0. Remove value on TOS. */
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c_code = !is_zero (ex_stack->s_num);
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pop ();
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case 'J' : /* Jump to a label. */
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label_num = byte(&pc); /* Low order bits first. */
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label_num += byte(&pc) << 8;
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if (inst == 'J' || (inst == 'B' && c_code)
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|| (inst == 'Z' && !c_code)) {
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gp = functions[pc.pc_func].f_label;
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l_gp = label_num >> BC_LABEL_LOG;
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l_off = label_num % BC_LABEL_GROUP;
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while (l_gp-- > 0) gp = gp->l_next;
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pc.pc_addr = gp->l_adrs[l_off];
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}
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break;
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case 'C' : /* Call a function. */
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/* Get the function number. */
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new_func = byte(&pc);
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if ((new_func & 0x80) != 0)
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new_func = ((new_func << 8) & 0x7f) + byte(&pc);
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/* Check to make sure it is defined. */
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if (!functions[new_func].f_defined)
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{
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rt_error ("Function %s not defined.", f_names[new_func]);
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break;
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}
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/* Check and push parameters. */
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process_params (&pc, new_func);
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/* Push auto variables. */
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for (auto_list = functions[new_func].f_autos;
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auto_list != NULL;
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auto_list = auto_list->next)
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auto_var (auto_list->av_name);
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/* Push pc and ibase. */
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fpush (pc.pc_func);
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fpush (pc.pc_addr);
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fpush (i_base);
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/* Reset pc to start of function. */
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pc.pc_func = new_func;
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pc.pc_addr = 0;
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break;
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case 'D' : /* Duplicate top of stack */
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push_copy (ex_stack->s_num);
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break;
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case 'K' : /* Push a constant */
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/* Get the input base and convert it to a bc number. */
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if (pc.pc_func == 0)
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const_base = i_base;
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else
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const_base = fn_stack->s_val;
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if (const_base == 10)
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push_b10_const (&pc);
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else
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push_constant (prog_char, const_base);
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break;
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case 'L' : /* load array variable */
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var_name = byte(&pc);
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if ((var_name & 0x80) != 0)
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var_name = ((var_name << 8) & 0x7f) + byte(&pc);
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load_array (var_name);
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break;
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case 'M' : /* decrement array variable (Minus!) */
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var_name = byte(&pc);
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if ((var_name & 0x80) != 0)
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var_name = ((var_name << 8) & 0x7f) + byte(&pc);
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decr_array (var_name);
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break;
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case 'O' : /* Write a string to the output with processing. */
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while ((ch = byte(&pc)) != '"')
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if (ch != '\\')
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out_char (ch);
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else
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{
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ch = byte(&pc);
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if (ch == '"') break;
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switch (ch)
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{
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case 'n': out_char ('\n'); break;
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case 't': out_char ('\t'); break;
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case 'r': out_char ('\r'); break;
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case 'b': out_char (007); break;
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case 'f': out_char ('\f'); break;
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case '\\': out_char ('\\'); break;
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default: break;
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}
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}
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if (interactive) fflush (stdout);
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break;
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case 'R' : /* Return from function */
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if (pc.pc_func != 0)
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{
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/* "Pop" autos and parameters. */
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pop_vars(functions[pc.pc_func].f_autos);
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pop_vars(functions[pc.pc_func].f_params);
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/* reset the pc. */
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fpop ();
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pc.pc_addr = fpop ();
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pc.pc_func = fpop ();
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}
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else
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rt_error ("Return from main program.");
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break;
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case 'S' : /* store array variable */
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var_name = byte(&pc);
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if ((var_name & 0x80) != 0)
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var_name = ((var_name << 8) & 0x7f) + byte(&pc);
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store_array (var_name);
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break;
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case 'T' : /* Test tos for zero */
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c_code = is_zero (ex_stack->s_num);
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assign (c_code);
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break;
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case 'W' : /* Write the value on the top of the stack. */
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case 'P' : /* Write the value on the top of the stack. No newline. */
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out_num (ex_stack->s_num, o_base, out_char);
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if (inst == 'W') out_char ('\n');
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store_var (3); /* Special variable "last". */
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if (interactive) fflush (stdout);
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break;
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case 'c' : /* Call special function. */
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new_func = byte(&pc);
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switch (new_func)
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{
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case 'L': /* Length function. */
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/* For the number 0.xxxx, 0 is not significant. */
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if (ex_stack->s_num->n_len == 1 &&
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ex_stack->s_num->n_scale != 0 &&
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ex_stack->s_num->n_value[0] == 0 )
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int2num (&ex_stack->s_num, ex_stack->s_num->n_scale);
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else
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int2num (&ex_stack->s_num, ex_stack->s_num->n_len
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+ ex_stack->s_num->n_scale);
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break;
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case 'S': /* Scale function. */
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int2num (&ex_stack->s_num, ex_stack->s_num->n_scale);
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break;
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case 'R': /* Square Root function. */
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if (!bc_sqrt (&ex_stack->s_num, scale))
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rt_error ("Square root of a negative number");
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break;
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case 'I': /* Read function. */
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push_constant (input_char, i_base);
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break;
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}
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break;
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case 'd' : /* Decrement number */
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var_name = byte(&pc);
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if ((var_name & 0x80) != 0)
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var_name = ((var_name << 8) & 0x7f) + byte(&pc);
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decr_var (var_name);
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break;
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case 'h' : /* Halt the machine. */
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exit (0);
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case 'i' : /* increment number */
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var_name = byte(&pc);
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if ((var_name & 0x80) != 0)
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var_name = ((var_name << 8) & 0x7f) + byte(&pc);
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incr_var (var_name);
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break;
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case 'l' : /* load variable */
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var_name = byte(&pc);
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if ((var_name & 0x80) != 0)
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var_name = ((var_name << 8) & 0x7f) + byte(&pc);
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load_var (var_name);
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break;
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case 'n' : /* Negate top of stack. */
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bc_sub (_zero_, ex_stack->s_num, &ex_stack->s_num);
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break;
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case 'p' : /* Pop the execution stack. */
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pop ();
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break;
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case 's' : /* store variable */
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var_name = byte(&pc);
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if ((var_name & 0x80) != 0)
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var_name = ((var_name << 8) & 0x7f) + byte(&pc);
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store_var (var_name);
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break;
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case 'w' : /* Write a string to the output. */
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while ((ch = byte(&pc)) != '"') out_char (ch);
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if (interactive) fflush (stdout);
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break;
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case 'x' : /* Exchange Top of Stack with the one under the tos. */
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if (check_stack(2)) {
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bc_num temp = ex_stack->s_num;
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ex_stack->s_num = ex_stack->s_next->s_num;
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ex_stack->s_next->s_num = temp;
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}
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break;
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case '0' : /* Load Constant 0. */
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push_copy (_zero_);
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break;
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case '1' : /* Load Constant 0. */
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push_copy (_one_);
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break;
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case '!' : /* Negate the boolean value on top of the stack. */
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c_code = is_zero (ex_stack->s_num);
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assign (c_code);
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break;
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case '&' : /* compare greater than */
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if (check_stack(2))
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{
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c_code = !is_zero (ex_stack->s_next->s_num)
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&& !is_zero (ex_stack->s_num);
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pop ();
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assign (c_code);
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}
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break;
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case '|' : /* compare greater than */
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if (check_stack(2))
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{
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c_code = !is_zero (ex_stack->s_next->s_num)
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|| !is_zero (ex_stack->s_num);
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pop ();
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assign (c_code);
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}
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break;
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case '+' : /* add */
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if (check_stack(2))
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{
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bc_add (ex_stack->s_next->s_num, ex_stack->s_num, &temp_num);
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pop();
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pop();
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push_num (temp_num);
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init_num (&temp_num);
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}
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break;
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case '-' : /* subtract */
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if (check_stack(2))
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{
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bc_sub (ex_stack->s_next->s_num, ex_stack->s_num, &temp_num);
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pop();
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pop();
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push_num (temp_num);
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init_num (&temp_num);
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}
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break;
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case '*' : /* multiply */
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if (check_stack(2))
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{
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bc_multiply (ex_stack->s_next->s_num, ex_stack->s_num,
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&temp_num, scale);
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pop();
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pop();
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push_num (temp_num);
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init_num (&temp_num);
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}
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break;
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case '/' : /* divide */
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if (check_stack(2))
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{
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if (bc_divide (ex_stack->s_next->s_num,
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ex_stack->s_num, &temp_num, scale) == 0)
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{
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pop();
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pop();
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push_num (temp_num);
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init_num (&temp_num);
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}
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else
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rt_error ("Divide by zero");
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}
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break;
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case '%' : /* remainder */
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if (check_stack(2))
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{
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if (is_zero (ex_stack->s_num))
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rt_error ("Modulo by zero");
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else
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{
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bc_modulo (ex_stack->s_next->s_num,
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ex_stack->s_num, &temp_num, scale);
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pop();
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pop();
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push_num (temp_num);
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init_num (&temp_num);
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}
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}
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break;
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case '^' : /* raise */
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if (check_stack(2))
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{
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bc_raise (ex_stack->s_next->s_num,
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ex_stack->s_num, &temp_num, scale);
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if (is_zero (ex_stack->s_next->s_num) && is_neg (ex_stack->s_num))
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rt_error ("divide by zero");
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pop();
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pop();
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push_num (temp_num);
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init_num (&temp_num);
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}
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break;
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case '=' : /* compare equal */
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if (check_stack(2))
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{
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c_code = bc_compare (ex_stack->s_next->s_num,
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ex_stack->s_num) == 0;
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pop ();
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assign (c_code);
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}
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break;
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case '#' : /* compare not equal */
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if (check_stack(2))
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{
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c_code = bc_compare (ex_stack->s_next->s_num,
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ex_stack->s_num) != 0;
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pop ();
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assign (c_code);
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}
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break;
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case '<' : /* compare less than */
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if (check_stack(2))
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{
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c_code = bc_compare (ex_stack->s_next->s_num,
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ex_stack->s_num) == -1;
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pop ();
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assign (c_code);
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}
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break;
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case '{' : /* compare less than or equal */
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if (check_stack(2))
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{
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c_code = bc_compare (ex_stack->s_next->s_num,
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ex_stack->s_num) <= 0;
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pop ();
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assign (c_code);
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}
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break;
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case '>' : /* compare greater than */
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if (check_stack(2))
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{
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c_code = bc_compare (ex_stack->s_next->s_num,
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ex_stack->s_num) == 1;
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pop ();
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assign (c_code);
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}
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break;
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case '}' : /* compare greater than or equal */
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if (check_stack(2))
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{
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c_code = bc_compare (ex_stack->s_next->s_num,
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ex_stack->s_num) >= 0;
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pop ();
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assign (c_code);
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}
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break;
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default : /* error! */
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rt_error ("bad instruction: inst=%c", inst);
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}
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}
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/* Clean up the function stack and pop all autos/parameters. */
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while (pc.pc_func != 0)
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{
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pop_vars(functions[pc.pc_func].f_autos);
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pop_vars(functions[pc.pc_func].f_params);
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fpop ();
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pc.pc_addr = fpop ();
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pc.pc_func = fpop ();
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}
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/* Clean up the execution stack. */
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while (ex_stack != NULL) pop();
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/* Clean up the interrupt stuff. */
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if (interactive)
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{
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signal (SIGINT, use_quit);
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if (had_sigint)
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printf ("Interruption completed.\n");
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}
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}
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/* Prog_char gets another byte from the program. It is used for
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conversion of text constants in the code to numbers. */
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char
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prog_char ()
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{
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return byte(&pc);
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}
|
|
|
|
|
|
/* Read a character from the standard input. This function is used
|
|
by the "read" function. */
|
|
|
|
char
|
|
input_char ()
|
|
{
|
|
char in_ch;
|
|
|
|
/* Get a character from the standard input for the read function. */
|
|
in_ch = getchar();
|
|
|
|
/* Check for a \ quoted newline. */
|
|
if (in_ch == '\\')
|
|
{
|
|
in_ch = getchar();
|
|
if (in_ch == '\n')
|
|
in_ch = getchar();
|
|
}
|
|
|
|
/* Classify and preprocess the input character. */
|
|
if (isdigit(in_ch))
|
|
return (in_ch - '0');
|
|
if (in_ch >= 'A' && in_ch <= 'F')
|
|
return (in_ch + 10 - 'A');
|
|
if (in_ch >= 'a' && in_ch <= 'f')
|
|
return (in_ch + 10 - 'a');
|
|
if (in_ch == '.' || in_ch == '+' || in_ch == '-')
|
|
return (in_ch);
|
|
if (in_ch <= ' ')
|
|
return (' ');
|
|
|
|
return (':');
|
|
}
|
|
|
|
|
|
/* Push_constant converts a sequence of input characters as returned
|
|
by IN_CHAR into a number. The number is pushed onto the execution
|
|
stack. The number is converted as a number in base CONV_BASE. */
|
|
|
|
void
|
|
push_constant (in_char, conv_base)
|
|
char (*in_char)(VOID);
|
|
int conv_base;
|
|
{
|
|
int digits;
|
|
bc_num build, temp, result, mult, divisor;
|
|
char in_ch, first_ch;
|
|
char negative;
|
|
|
|
/* Initialize all bc numbers */
|
|
init_num (&temp);
|
|
init_num (&result);
|
|
init_num (&mult);
|
|
build = copy_num (_zero_);
|
|
negative = FALSE;
|
|
|
|
/* The conversion base. */
|
|
int2num (&mult, conv_base);
|
|
|
|
/* Get things ready. */
|
|
in_ch = in_char();
|
|
while (in_ch == ' ')
|
|
in_ch = in_char();
|
|
|
|
if (in_ch == '+')
|
|
in_ch = in_char();
|
|
else
|
|
if (in_ch == '-')
|
|
{
|
|
negative = TRUE;
|
|
in_ch = in_char();
|
|
}
|
|
|
|
/* Check for the special case of a single digit. */
|
|
if (in_ch < 16)
|
|
{
|
|
first_ch = in_ch;
|
|
in_ch = in_char();
|
|
if (in_ch < 16 && first_ch >= conv_base)
|
|
first_ch = conv_base - 1;
|
|
int2num (&build, (int) first_ch);
|
|
}
|
|
|
|
/* Convert the integer part. */
|
|
while (in_ch < 16)
|
|
{
|
|
if (in_ch < 16 && in_ch >= conv_base) in_ch = conv_base-1;
|
|
bc_multiply (build, mult, &result, 0);
|
|
int2num (&temp, (int) in_ch);
|
|
bc_add (result, temp, &build);
|
|
in_ch = in_char();
|
|
}
|
|
if (in_ch == '.')
|
|
{
|
|
in_ch = in_char();
|
|
if (in_ch >= conv_base) in_ch = conv_base-1;
|
|
free_num (&result);
|
|
free_num (&temp);
|
|
divisor = copy_num (_one_);
|
|
result = copy_num (_zero_);
|
|
digits = 0;
|
|
while (in_ch < 16)
|
|
{
|
|
bc_multiply (result, mult, &result, 0);
|
|
int2num (&temp, (int) in_ch);
|
|
bc_add (result, temp, &result);
|
|
bc_multiply (divisor, mult, &divisor, 0);
|
|
digits++;
|
|
in_ch = in_char();
|
|
if (in_ch < 16 && in_ch >= conv_base) in_ch = conv_base-1;
|
|
}
|
|
bc_divide (result, divisor, &result, digits);
|
|
bc_add (build, result, &build);
|
|
}
|
|
|
|
/* Final work. */
|
|
if (negative)
|
|
bc_sub (_zero_, build, &build);
|
|
|
|
push_num (build);
|
|
free_num (&temp);
|
|
free_num (&result);
|
|
free_num (&mult);
|
|
}
|
|
|
|
|
|
/* When converting base 10 constants from the program, we use this
|
|
more efficient way to convert them to numbers. PC tells where
|
|
the constant starts and is expected to be advanced to after
|
|
the constant. */
|
|
|
|
void
|
|
push_b10_const (pc)
|
|
program_counter *pc;
|
|
{
|
|
bc_num build;
|
|
program_counter look_pc;
|
|
int kdigits, kscale;
|
|
char inchar;
|
|
char *ptr;
|
|
|
|
/* Count the digits and get things ready. */
|
|
look_pc = *pc;
|
|
kdigits = 0;
|
|
kscale = 0;
|
|
inchar = byte (&look_pc);
|
|
while (inchar != '.' && inchar != ':')
|
|
{
|
|
kdigits++;
|
|
inchar = byte(&look_pc);
|
|
}
|
|
if (inchar == '.' )
|
|
{
|
|
inchar = byte(&look_pc);
|
|
while (inchar != ':')
|
|
{
|
|
kscale++;
|
|
inchar = byte(&look_pc);
|
|
}
|
|
}
|
|
|
|
/* Get the first character again and move the pc. */
|
|
inchar = byte(pc);
|
|
|
|
/* Secial cases of 0, 1, and A-F single inputs. */
|
|
if (kdigits == 1 && kscale == 0)
|
|
{
|
|
if (inchar == 0)
|
|
{
|
|
push_copy (_zero_);
|
|
inchar = byte(pc);
|
|
return;
|
|
}
|
|
if (inchar == 1) {
|
|
push_copy (_one_);
|
|
inchar = byte(pc);
|
|
return;
|
|
}
|
|
if (inchar > 9)
|
|
{
|
|
init_num (&build);
|
|
int2num (&build, inchar);
|
|
push_num (build);
|
|
inchar = byte(pc);
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* Build the new number. */
|
|
if (kdigits == 0)
|
|
{
|
|
build = new_num (1,kscale);
|
|
ptr = build->n_value;
|
|
*ptr++ = 0;
|
|
}
|
|
else
|
|
{
|
|
build = new_num (kdigits,kscale);
|
|
ptr = build->n_value;
|
|
}
|
|
|
|
while (inchar != ':')
|
|
{
|
|
if (inchar != '.')
|
|
if (inchar > 9)
|
|
*ptr++ = 9;
|
|
else
|
|
*ptr++ = inchar;
|
|
inchar = byte(pc);
|
|
}
|
|
push_num (build);
|
|
}
|
|
|
|
|
|
/* Put the correct value on the stack for C_CODE. Frees TOS num. */
|
|
|
|
void
|
|
assign (c_code)
|
|
char c_code;
|
|
{
|
|
free_num (&ex_stack->s_num);
|
|
if (c_code)
|
|
ex_stack->s_num = copy_num (_one_);
|
|
else
|
|
ex_stack->s_num = copy_num (_zero_);
|
|
}
|