792 lines
21 KiB
C
792 lines
21 KiB
C
/*******************************************************************
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** v m . c
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** Forth Inspired Command Language - virtual machine methods
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** Author: John Sadler (john_sadler@alum.mit.edu)
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** Created: 19 July 1997
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** $Id: vm.c,v 1.13 2001/12/05 07:21:34 jsadler Exp $
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*******************************************************************/
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/*
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** This file implements the virtual machine of FICL. Each virtual
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** machine retains the state of an interpreter. A virtual machine
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** owns a pair of stacks for parameters and return addresses, as
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** well as a pile of state variables and the two dedicated registers
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** of the interp.
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*/
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/*
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** Copyright (c) 1997-2001 John Sadler (john_sadler@alum.mit.edu)
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** All rights reserved.
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**
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** Get the latest Ficl release at http://ficl.sourceforge.net
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**
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** I am interested in hearing from anyone who uses ficl. If you have
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** a problem, a success story, a defect, an enhancement request, or
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** if you would like to contribute to the ficl release, please
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** contact me by email at the address above.
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**
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** L I C E N S E and D I S C L A I M E R
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**
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** Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions
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** are met:
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** 1. Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** 2. Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in the
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** documentation and/or other materials provided with the distribution.
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**
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** THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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** ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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** OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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** HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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** SUCH DAMAGE.
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*/
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/* $FreeBSD$ */
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#ifdef TESTMAIN
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#include <stdlib.h>
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#include <stdio.h>
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#include <ctype.h>
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#else
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#include <stand.h>
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#endif
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#include <stdarg.h>
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#include <string.h>
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#include "ficl.h"
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static char digits[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
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/**************************************************************************
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v m B r a n c h R e l a t i v e
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**
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**************************************************************************/
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void vmBranchRelative(FICL_VM *pVM, int offset)
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{
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pVM->ip += offset;
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return;
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}
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/**************************************************************************
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v m C r e a t e
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** Creates a virtual machine either from scratch (if pVM is NULL on entry)
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** or by resizing and reinitializing an existing VM to the specified stack
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** sizes.
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**************************************************************************/
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FICL_VM *vmCreate(FICL_VM *pVM, unsigned nPStack, unsigned nRStack)
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{
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if (pVM == NULL)
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{
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pVM = (FICL_VM *)ficlMalloc(sizeof (FICL_VM));
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assert (pVM);
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memset(pVM, 0, sizeof (FICL_VM));
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}
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if (pVM->pStack)
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stackDelete(pVM->pStack);
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pVM->pStack = stackCreate(nPStack);
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if (pVM->rStack)
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stackDelete(pVM->rStack);
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pVM->rStack = stackCreate(nRStack);
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#if FICL_WANT_FLOAT
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if (pVM->fStack)
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stackDelete(pVM->fStack);
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pVM->fStack = stackCreate(nPStack);
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#endif
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pVM->textOut = ficlTextOut;
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vmReset(pVM);
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return pVM;
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}
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/**************************************************************************
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v m D e l e t e
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** Free all memory allocated to the specified VM and its subordinate
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** structures.
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**************************************************************************/
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void vmDelete (FICL_VM *pVM)
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{
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if (pVM)
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{
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ficlFree(pVM->pStack);
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ficlFree(pVM->rStack);
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#if FICL_WANT_FLOAT
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ficlFree(pVM->fStack);
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#endif
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ficlFree(pVM);
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}
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return;
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}
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/**************************************************************************
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v m E x e c u t e
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** Sets up the specified word to be run by the inner interpreter.
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** Executes the word's code part immediately, but in the case of
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** colon definition, the definition itself needs the inner interp
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** to complete. This does not happen until control reaches ficlExec
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**************************************************************************/
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void vmExecute(FICL_VM *pVM, FICL_WORD *pWord)
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{
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pVM->runningWord = pWord;
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pWord->code(pVM);
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return;
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}
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/**************************************************************************
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v m I n n e r L o o p
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** the mysterious inner interpreter...
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** This loop is the address interpreter that makes colon definitions
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** work. Upon entry, it assumes that the IP points to an entry in
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** a definition (the body of a colon word). It runs one word at a time
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** until something does vmThrow. The catcher for this is expected to exist
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** in the calling code.
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** vmThrow gets you out of this loop with a longjmp()
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** Visual C++ 5 chokes on this loop in Release mode. Aargh.
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**************************************************************************/
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#if INLINE_INNER_LOOP == 0
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void vmInnerLoop(FICL_VM *pVM)
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{
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M_INNER_LOOP(pVM);
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}
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#endif
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#if 0
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/*
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** Recast inner loop that inlines tokens for control structures, arithmetic and stack operations,
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** as well as create does> : ; and various literals
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*/
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typedef enum
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{
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PATCH = 0,
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L0,
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L1,
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L2,
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LMINUS1,
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LMINUS2,
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DROP,
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SWAP,
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DUP,
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PICK,
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ROLL,
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FETCH,
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STORE,
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BRANCH,
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CBRANCH,
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LEAVE,
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TO_R,
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R_FROM,
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EXIT;
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} OPCODE;
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typedef CELL *IPTYPE;
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void vmInnerLoop(FICL_VM *pVM)
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{
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IPTYPE ip = pVM->ip;
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FICL_STACK *pStack = pVM->pStack;
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for (;;)
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{
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OPCODE o = (*ip++).i;
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CELL c;
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switch (o)
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{
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case L0:
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stackPushINT(pStack, 0);
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break;
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case L1:
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stackPushINT(pStack, 1);
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break;
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case L2:
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stackPushINT(pStack, 2);
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break;
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case LMINUS1:
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stackPushINT(pStack, -1);
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break;
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case LMINUS2:
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stackPushINT(pStack, -2);
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break;
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case DROP:
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stackDrop(pStack, 1);
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break;
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case SWAP:
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stackRoll(pStack, 1);
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break;
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case DUP:
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stackPick(pStack, 0);
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break;
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case PICK:
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c = *ip++;
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stackPick(pStack, c.i);
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break;
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case ROLL:
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c = *ip++;
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stackRoll(pStack, c.i);
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break;
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case EXIT:
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return;
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}
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}
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return;
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}
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#endif
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/**************************************************************************
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v m G e t D i c t
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** Returns the address dictionary for this VM's system
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**************************************************************************/
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FICL_DICT *vmGetDict(FICL_VM *pVM)
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{
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assert(pVM);
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return pVM->pSys->dp;
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}
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/**************************************************************************
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v m G e t S t r i n g
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** Parses a string out of the VM input buffer and copies up to the first
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** FICL_STRING_MAX characters to the supplied destination buffer, a
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** FICL_STRING. The destination string is NULL terminated.
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**
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** Returns the address of the first unused character in the dest buffer.
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**************************************************************************/
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char *vmGetString(FICL_VM *pVM, FICL_STRING *spDest, char delimiter)
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{
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STRINGINFO si = vmParseStringEx(pVM, delimiter, 0);
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if (SI_COUNT(si) > FICL_STRING_MAX)
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{
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SI_SETLEN(si, FICL_STRING_MAX);
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}
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strncpy(spDest->text, SI_PTR(si), SI_COUNT(si));
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spDest->text[SI_COUNT(si)] = '\0';
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spDest->count = (FICL_COUNT)SI_COUNT(si);
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return spDest->text + SI_COUNT(si) + 1;
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}
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/**************************************************************************
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v m G e t W o r d
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** vmGetWord calls vmGetWord0 repeatedly until it gets a string with
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** non-zero length.
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**************************************************************************/
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STRINGINFO vmGetWord(FICL_VM *pVM)
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{
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STRINGINFO si = vmGetWord0(pVM);
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if (SI_COUNT(si) == 0)
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{
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vmThrow(pVM, VM_RESTART);
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}
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return si;
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}
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/**************************************************************************
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v m G e t W o r d 0
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** Skip leading whitespace and parse a space delimited word from the tib.
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** Returns the start address and length of the word. Updates the tib
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** to reflect characters consumed, including the trailing delimiter.
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** If there's nothing of interest in the tib, returns zero. This function
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** does not use vmParseString because it uses isspace() rather than a
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** single delimiter character.
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**************************************************************************/
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STRINGINFO vmGetWord0(FICL_VM *pVM)
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{
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char *pSrc = vmGetInBuf(pVM);
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char *pEnd = vmGetInBufEnd(pVM);
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STRINGINFO si;
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FICL_UNS count = 0;
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char ch;
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pSrc = skipSpace(pSrc, pEnd);
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SI_SETPTR(si, pSrc);
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for (ch = *pSrc; (pEnd != pSrc) && !isspace(ch); ch = *++pSrc)
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{
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count++;
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}
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SI_SETLEN(si, count);
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if ((pEnd != pSrc) && isspace(ch)) /* skip one trailing delimiter */
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pSrc++;
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vmUpdateTib(pVM, pSrc);
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return si;
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}
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/**************************************************************************
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v m G e t W o r d T o P a d
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** Does vmGetWord and copies the result to the pad as a NULL terminated
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** string. Returns the length of the string. If the string is too long
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** to fit in the pad, it is truncated.
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**************************************************************************/
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int vmGetWordToPad(FICL_VM *pVM)
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{
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STRINGINFO si;
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char *cp = (char *)pVM->pad;
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si = vmGetWord(pVM);
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if (SI_COUNT(si) > nPAD)
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SI_SETLEN(si, nPAD);
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strncpy(cp, SI_PTR(si), SI_COUNT(si));
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cp[SI_COUNT(si)] = '\0';
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return (int)(SI_COUNT(si));
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}
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/**************************************************************************
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v m P a r s e S t r i n g
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** Parses a string out of the input buffer using the delimiter
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** specified. Skips leading delimiters, marks the start of the string,
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** and counts characters to the next delimiter it encounters. It then
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** updates the vm input buffer to consume all these chars, including the
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** trailing delimiter.
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** Returns the address and length of the parsed string, not including the
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** trailing delimiter.
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**************************************************************************/
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STRINGINFO vmParseString(FICL_VM *pVM, char delim)
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{
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return vmParseStringEx(pVM, delim, 1);
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}
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STRINGINFO vmParseStringEx(FICL_VM *pVM, char delim, char fSkipLeading)
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{
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STRINGINFO si;
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char *pSrc = vmGetInBuf(pVM);
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char *pEnd = vmGetInBufEnd(pVM);
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char ch;
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if (fSkipLeading)
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{ /* skip lead delimiters */
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while ((pSrc != pEnd) && (*pSrc == delim))
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pSrc++;
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}
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SI_SETPTR(si, pSrc); /* mark start of text */
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for (ch = *pSrc; (pSrc != pEnd)
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&& (ch != delim)
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&& (ch != '\r')
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&& (ch != '\n'); ch = *++pSrc)
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{
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; /* find next delimiter or end of line */
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}
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/* set length of result */
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SI_SETLEN(si, pSrc - SI_PTR(si));
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if ((pSrc != pEnd) && (*pSrc == delim)) /* gobble trailing delimiter */
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pSrc++;
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vmUpdateTib(pVM, pSrc);
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return si;
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}
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/**************************************************************************
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v m P o p
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**
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**************************************************************************/
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CELL vmPop(FICL_VM *pVM)
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{
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return stackPop(pVM->pStack);
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}
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/**************************************************************************
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v m P u s h
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**
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**************************************************************************/
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void vmPush(FICL_VM *pVM, CELL c)
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{
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stackPush(pVM->pStack, c);
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return;
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}
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/**************************************************************************
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v m P o p I P
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**
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**************************************************************************/
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void vmPopIP(FICL_VM *pVM)
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{
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pVM->ip = (IPTYPE)(stackPopPtr(pVM->rStack));
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return;
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}
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/**************************************************************************
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v m P u s h I P
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**
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**************************************************************************/
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void vmPushIP(FICL_VM *pVM, IPTYPE newIP)
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{
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stackPushPtr(pVM->rStack, (void *)pVM->ip);
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pVM->ip = newIP;
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return;
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}
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/**************************************************************************
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v m P u s h T i b
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** Binds the specified input string to the VM and clears >IN (the index)
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**************************************************************************/
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void vmPushTib(FICL_VM *pVM, char *text, FICL_INT nChars, TIB *pSaveTib)
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{
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if (pSaveTib)
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{
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*pSaveTib = pVM->tib;
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}
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pVM->tib.cp = text;
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pVM->tib.end = text + nChars;
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pVM->tib.index = 0;
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}
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void vmPopTib(FICL_VM *pVM, TIB *pTib)
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{
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if (pTib)
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{
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pVM->tib = *pTib;
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}
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return;
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}
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/**************************************************************************
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v m Q u i t
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**
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**************************************************************************/
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void vmQuit(FICL_VM *pVM)
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{
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stackReset(pVM->rStack);
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pVM->fRestart = 0;
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pVM->ip = NULL;
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pVM->runningWord = NULL;
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pVM->state = INTERPRET;
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pVM->tib.cp = NULL;
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pVM->tib.end = NULL;
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pVM->tib.index = 0;
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pVM->pad[0] = '\0';
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pVM->sourceID.i = 0;
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return;
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}
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/**************************************************************************
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v m R e s e t
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**
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**************************************************************************/
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void vmReset(FICL_VM *pVM)
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{
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vmQuit(pVM);
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stackReset(pVM->pStack);
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#if FICL_WANT_FLOAT
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stackReset(pVM->fStack);
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#endif
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pVM->base = 10;
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return;
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}
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/**************************************************************************
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v m S e t T e x t O u t
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** Binds the specified output callback to the vm. If you pass NULL,
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** binds the default output function (ficlTextOut)
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**************************************************************************/
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void vmSetTextOut(FICL_VM *pVM, OUTFUNC textOut)
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{
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if (textOut)
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pVM->textOut = textOut;
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else
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pVM->textOut = ficlTextOut;
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return;
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}
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/**************************************************************************
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v m T e x t O u t
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** Feeds text to the vm's output callback
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**************************************************************************/
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void vmTextOut(FICL_VM *pVM, char *text, int fNewline)
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{
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assert(pVM);
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assert(pVM->textOut);
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(pVM->textOut)(pVM, text, fNewline);
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return;
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}
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/**************************************************************************
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v m T h r o w
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**
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**************************************************************************/
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void vmThrow(FICL_VM *pVM, int except)
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{
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if (pVM->pState)
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longjmp(*(pVM->pState), except);
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}
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void vmThrowErr(FICL_VM *pVM, char *fmt, ...)
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{
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va_list va;
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va_start(va, fmt);
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vsprintf(pVM->pad, fmt, va);
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vmTextOut(pVM, pVM->pad, 1);
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va_end(va);
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longjmp(*(pVM->pState), VM_ERREXIT);
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}
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/**************************************************************************
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w o r d I s I m m e d i a t e
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**
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**************************************************************************/
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int wordIsImmediate(FICL_WORD *pFW)
|
|
{
|
|
return ((pFW != NULL) && (pFW->flags & FW_IMMEDIATE));
|
|
}
|
|
|
|
|
|
/**************************************************************************
|
|
w o r d I s C o m p i l e O n l y
|
|
**
|
|
**************************************************************************/
|
|
int wordIsCompileOnly(FICL_WORD *pFW)
|
|
{
|
|
return ((pFW != NULL) && (pFW->flags & FW_COMPILE));
|
|
}
|
|
|
|
|
|
/**************************************************************************
|
|
s t r r e v
|
|
**
|
|
**************************************************************************/
|
|
char *strrev( char *string )
|
|
{ /* reverse a string in-place */
|
|
int i = strlen(string);
|
|
char *p1 = string; /* first char of string */
|
|
char *p2 = string + i - 1; /* last non-NULL char of string */
|
|
char c;
|
|
|
|
if (i > 1)
|
|
{
|
|
while (p1 < p2)
|
|
{
|
|
c = *p2;
|
|
*p2 = *p1;
|
|
*p1 = c;
|
|
p1++; p2--;
|
|
}
|
|
}
|
|
|
|
return string;
|
|
}
|
|
|
|
|
|
/**************************************************************************
|
|
d i g i t _ t o _ c h a r
|
|
**
|
|
**************************************************************************/
|
|
char digit_to_char(int value)
|
|
{
|
|
return digits[value];
|
|
}
|
|
|
|
|
|
/**************************************************************************
|
|
i s P o w e r O f T w o
|
|
** Tests whether supplied argument is an integer power of 2 (2**n)
|
|
** where 32 > n > 1, and returns n if so. Otherwise returns zero.
|
|
**************************************************************************/
|
|
int isPowerOfTwo(FICL_UNS u)
|
|
{
|
|
int i = 1;
|
|
FICL_UNS t = 2;
|
|
|
|
for (; ((t <= u) && (t != 0)); i++, t <<= 1)
|
|
{
|
|
if (u == t)
|
|
return i;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**************************************************************************
|
|
l t o a
|
|
**
|
|
**************************************************************************/
|
|
char *ltoa( FICL_INT value, char *string, int radix )
|
|
{ /* convert long to string, any base */
|
|
char *cp = string;
|
|
int sign = ((radix == 10) && (value < 0));
|
|
int pwr;
|
|
|
|
assert(radix > 1);
|
|
assert(radix < 37);
|
|
assert(string);
|
|
|
|
pwr = isPowerOfTwo((FICL_UNS)radix);
|
|
|
|
if (sign)
|
|
value = -value;
|
|
|
|
if (value == 0)
|
|
*cp++ = '0';
|
|
else if (pwr != 0)
|
|
{
|
|
FICL_UNS v = (FICL_UNS) value;
|
|
FICL_UNS mask = (FICL_UNS) ~(-1 << pwr);
|
|
while (v)
|
|
{
|
|
*cp++ = digits[v & mask];
|
|
v >>= pwr;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
UNSQR result;
|
|
DPUNS v;
|
|
v.hi = 0;
|
|
v.lo = (FICL_UNS)value;
|
|
while (v.lo)
|
|
{
|
|
result = ficlLongDiv(v, (FICL_UNS)radix);
|
|
*cp++ = digits[result.rem];
|
|
v.lo = result.quot;
|
|
}
|
|
}
|
|
|
|
if (sign)
|
|
*cp++ = '-';
|
|
|
|
*cp++ = '\0';
|
|
|
|
return strrev(string);
|
|
}
|
|
|
|
|
|
/**************************************************************************
|
|
u l t o a
|
|
**
|
|
**************************************************************************/
|
|
char *ultoa(FICL_UNS value, char *string, int radix )
|
|
{ /* convert long to string, any base */
|
|
char *cp = string;
|
|
DPUNS ud;
|
|
UNSQR result;
|
|
|
|
assert(radix > 1);
|
|
assert(radix < 37);
|
|
assert(string);
|
|
|
|
if (value == 0)
|
|
*cp++ = '0';
|
|
else
|
|
{
|
|
ud.hi = 0;
|
|
ud.lo = value;
|
|
result.quot = value;
|
|
|
|
while (ud.lo)
|
|
{
|
|
result = ficlLongDiv(ud, (FICL_UNS)radix);
|
|
ud.lo = result.quot;
|
|
*cp++ = digits[result.rem];
|
|
}
|
|
}
|
|
|
|
*cp++ = '\0';
|
|
|
|
return strrev(string);
|
|
}
|
|
|
|
|
|
/**************************************************************************
|
|
c a s e F o l d
|
|
** Case folds a NULL terminated string in place. All characters
|
|
** get converted to lower case.
|
|
**************************************************************************/
|
|
char *caseFold(char *cp)
|
|
{
|
|
char *oldCp = cp;
|
|
|
|
while (*cp)
|
|
{
|
|
if (isupper(*cp))
|
|
*cp = (char)tolower(*cp);
|
|
cp++;
|
|
}
|
|
|
|
return oldCp;
|
|
}
|
|
|
|
|
|
/**************************************************************************
|
|
s t r i n c m p
|
|
** (jws) simplified the code a bit in hopes of appeasing Purify
|
|
**************************************************************************/
|
|
int strincmp(char *cp1, char *cp2, FICL_UNS count)
|
|
{
|
|
int i = 0;
|
|
|
|
for (; 0 < count; ++cp1, ++cp2, --count)
|
|
{
|
|
i = tolower(*cp1) - tolower(*cp2);
|
|
if (i != 0)
|
|
return i;
|
|
else if (*cp1 == '\0')
|
|
return 0;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**************************************************************************
|
|
s k i p S p a c e
|
|
** Given a string pointer, returns a pointer to the first non-space
|
|
** char of the string, or to the NULL terminator if no such char found.
|
|
** If the pointer reaches "end" first, stop there. Pass NULL to
|
|
** suppress this behavior.
|
|
**************************************************************************/
|
|
char *skipSpace(char *cp, char *end)
|
|
{
|
|
assert(cp);
|
|
|
|
while ((cp != end) && isspace(*cp))
|
|
cp++;
|
|
|
|
return cp;
|
|
}
|
|
|
|
|