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freebsd-skq/sys/boot/ficl/ficl.h
dcs 1e7d7fa081 Bring in ficl 2.05. 
This version has a step debugger, which now completely replaces the
old trace feature. Also, we moved all of the FreeBSD-specific MI
code to loader.c, reducing the diff between this and the official
FICL distribution.
2001-04-29 02:36:36 +00:00

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/*******************************************************************
** f i c l . h
** Forth Inspired Command Language
** Author: John Sadler (john_sadler@alum.mit.edu)
** Created: 19 July 1997
** $Id: ficl.h,v 1.11 2001-04-26 21:41:48-07 jsadler Exp jsadler $
*******************************************************************/
/*
** Copyright (c) 1997-2001 John Sadler (john_sadler@alum.mit.edu)
** All rights reserved.
**
** Get the latest Ficl release at http://ficl.sourceforge.net
**
** L I C E N S E and D I S C L A I M E R
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions
** are met:
** 1. Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** 2. Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in the
** documentation and/or other materials provided with the distribution.
**
** THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
** ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
** OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
** HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
** SUCH DAMAGE.
**
** I am interested in hearing from anyone who uses ficl. If you have
** a problem, a success story, a defect, an enhancement request, or
** if you would like to contribute to the ficl release, please send
** contact me by email at the address above.
**
** $Id: ficl.h,v 1.11 2001-04-26 21:41:48-07 jsadler Exp jsadler $
*/
/* $FreeBSD$ */
#if !defined (__FICL_H__)
#define __FICL_H__
/*
** Ficl (Forth-inspired command language) is an ANS Forth
** interpreter written in C. Unlike traditional Forths, this
** interpreter is designed to be embedded into other systems
** as a command/macro/development prototype language.
**
** Where Forths usually view themselves as the center of the system
** and expect the rest of the system to be coded in Forth, Ficl
** acts as a component of the system. It is easy to export
** code written in C or ASM to Ficl in the style of TCL, or to invoke
** Ficl code from a compiled module. This allows you to do incremental
** development in a way that combines the best features of threaded
** languages (rapid development, quick code/test/debug cycle,
** reasonably fast) with the best features of C (everyone knows it,
** easier to support large blocks of code, efficient, type checking).
**
** Ficl provides facilities for interoperating
** with programs written in C: C functions can be exported to Ficl,
** and Ficl commands can be executed via a C calling interface. The
** interpreter is re-entrant, so it can be used in multiple instances
** in a multitasking system. Unlike Forth, Ficl's outer interpreter
** expects a text block as input, and returns to the caller after each
** text block, so the "data pump" is somewhere in external code. This
** is more like TCL than Forth, which usually expcets to be at the center
** of the system, requesting input at its convenience. Each Ficl virtual
** machine can be bound to a different I/O channel, and is independent
** of all others in in the same address space except that all virtual
** machines share a common dictionary (a sort or open symbol table that
** defines all of the elements of the language).
**
** Code is written in ANSI C for portability.
**
** Summary of Ficl features and constraints:
** - Standard: Implements the ANSI Forth CORE word set and part
** of the CORE EXT word-set, SEARCH and SEARCH EXT, TOOLS and
** TOOLS EXT, LOCAL and LOCAL ext and various extras.
** - Extensible: you can export code written in Forth, C,
** or asm in a straightforward way. Ficl provides open
** facilities for extending the language in an application
** specific way. You can even add new control structures!
** - Ficl and C can interact in two ways: Ficl can encapsulate
** C code, or C code can invoke Ficl code.
** - Thread-safe, re-entrant: The shared system dictionary
** uses a locking mechanism that you can either supply
** or stub out to provide exclusive access. Each Ficl
** virtual machine has an otherwise complete state, and
** each can be bound to a separate I/O channel (or none at all).
** - Simple encapsulation into existing systems: a basic implementation
** requires three function calls (see the example program in testmain.c).
** - ROMable: Ficl is designed to work in RAM-based and ROM code / RAM data
** environments. It does require somewhat more memory than a pure
** ROM implementation because it builds its system dictionary in
** RAM at startup time.
** - Written an ANSI C to be as simple as I can make it to understand,
** support, debug, and port. Compiles without complaint at /Az /W4
** (require ANSI C, max warnings) under Microsoft VC++ 5.
** - Does full 32 bit math (but you need to implement
** two mixed precision math primitives (see sysdep.c))
** - Indirect threaded interpreter is not the fastest kind of
** Forth there is (see pForth 68K for a really fast subroutine
** threaded interpreter), but it's the cleanest match to a
** pure C implementation.
**
** P O R T I N G F i c l
**
** To install Ficl on your target system, you need an ANSI C compiler
** and its runtime library. Inspect the system dependent macros and
** functions in sysdep.h and sysdep.c and edit them to suit your
** system. For example, INT16 is a short on some compilers and an
** int on others. Check the default CELL alignment controlled by
** FICL_ALIGN. If necessary, add new definitions of ficlMalloc, ficlFree,
** ficlLockDictionary, and ficlTextOut to work with your operating system.
** Finally, use testmain.c as a guide to installing the Ficl system and
** one or more virtual machines into your code. You do not need to include
** testmain.c in your build.
**
** T o D o L i s t
**
** 1. Unimplemented system dependent CORE word: key
** 2. Kludged CORE word: ACCEPT
** 3. Dictionary locking is full of holes - only one vm at a time
** can alter the dict.
** 4. Ficl uses the pad in CORE words - this violates the standard,
** but it's cleaner for a multithreaded system. I'll have to make a
** second pad for reference by the word PAD to fix this.
**
** F o r M o r e I n f o r m a t i o n
**
** Web home of ficl
** http://www.taygeta.com/forth/compilers
** Check this website for Forth literature (including the ANSI standard)
** http://www.taygeta.com/forthlit.html
** and here for software and more links
** http://www.taygeta.com/forth.html
**
** Obvious Performance enhancement opportunities
** Compile speed
** - work on interpret speed
** - turn off locals (FICL_WANT_LOCALS)
** Interpret speed
** - Change inner interpreter (and everything else)
** so that a definition is a list of pointers to functions
** and inline data rather than pointers to words. This gets
** rid of vm->runningWord and a level of indirection in the
** inner loop. I'll look at it for ficl 3.0
** - Make the main hash table a bigger prime (HASHSIZE)
** - FORGET about twiddling the hash function - my experience is
** that that is a waste of time.
** - eliminate the need to pass the pVM parameter on the stack
** by dedicating a register to it. Most words need access to the
** vm, but the parameter passing overhead can be reduced. One way
** requires that the host OS have a task switch callout. Create
** a global variable for the running VM and refer to it in words
** that need VM access. Alternative: use thread local storage.
** For single threaded implementations, you can just use a global.
** The first two solutions create portability problems, so I
** haven't considered doing them. Another possibility is to
** declare the pVm parameter to be "register", and hope the compiler
** pays attention.
**
*/
/*
** Revision History:
**
** 15 Apr 1999 (sadler) Merged FreeBSD changes for exception wordset and
** counted strings in ficlExec.
** 12 Jan 1999 (sobral) Corrected EVALUATE behavior. Now TIB has an
** "end" field, and all words respect this. ficlExec is passed a "size"
** of TIB, as well as vmPushTib. This size is used to calculate the "end"
** of the string, ie, base+size. If the size is not known, pass -1.
**
** 10 Jan 1999 (sobral) EXCEPTION word set has been added, and existing
** words has been modified to conform to EXCEPTION EXT word set.
**
** 27 Aug 1998 (sadler) testing and corrections for LOCALS, LOCALS EXT,
** SEARCH / SEARCH EXT, TOOLS / TOOLS EXT.
** Added .X to display in hex, PARSE and PARSE-WORD to supplement WORD,
** EMPTY to clear stack.
**
** 29 jun 1998 (sadler) added variable sized hash table support
** and ANS Forth optional SEARCH & SEARCH EXT word set.
** 26 May 1998 (sadler)
** FICL_PROMPT macro
** 14 April 1998 (sadler) V1.04
** Ficlwin: Windows version, Skip Carter's Linux port
** 5 March 1998 (sadler) V1.03
** Bug fixes -- passes John Ryan's ANS test suite "core.fr"
**
** 24 February 1998 (sadler) V1.02
** -Fixed bugs in <# # #>
** -Changed FICL_WORD so that storage for the name characters
** can be allocated from the dictionary as needed rather than
** reserving 32 bytes in each word whether needed or not -
** this saved 50% of the dictionary storage requirement.
** -Added words in testmain for Win32 functions system,chdir,cwd,
** also added a word that loads and evaluates a file.
**
** December 1997 (sadler)
** -Added VM_RESTART exception handling in ficlExec -- this lets words
** that require additional text to succeed (like :, create, variable...)
** recover gracefully from an empty input buffer rather than emitting
** an error message. Definitions can span multiple input blocks with
** no restrictions.
** -Changed #include order so that <assert.h> is included in sysdep.h,
** and sysdep is included in all other files. This lets you define
** NDEBUG in sysdep.h to disable assertions if you want to.
** -Make PC specific system dependent code conditional on _M_IX86
** defined so that ports can coexist in sysdep.h/sysdep.c
*/
#ifdef __cplusplus
extern "C" {
#endif
#include "sysdep.h"
#include <limits.h> /* UCHAR_MAX */
/*
** Forward declarations... read on.
*/
struct ficl_word;
struct vm;
struct ficl_dict;
struct ficl_system;
typedef struct ficl_system FICL_SYSTEM;
/*
** the Good Stuff starts here...
*/
#define FICL_VER "2.05"
#if !defined (FICL_PROMPT)
#define FICL_PROMPT "ok> "
#endif
/*
** ANS Forth requires false to be zero, and true to be the ones
** complement of false... that unifies logical and bitwise operations
** nicely.
*/
#define FICL_TRUE ((unsigned long)~(0L))
#define FICL_FALSE (0)
#define FICL_BOOL(x) ((x) ? FICL_TRUE : FICL_FALSE)
/*
** A CELL is the main storage type. It must be large enough
** to contain a pointer or a scalar. In order to accommodate
** 32 bit and 64 bit processors, use abstract types for i and u.
*/
typedef union _cell
{
FICL_INT i;
FICL_UNS u;
#if (FICL_WANT_FLOAT)
FICL_FLOAT f;
#endif
void *p;
void (*fn)(void);
} CELL;
/*
** LVALUEtoCELL does a little pointer trickery to cast any 32 bit
** lvalue (informal definition: an expression whose result has an
** address) to CELL. Remember that constants and casts are NOT
** themselves lvalues!
*/
#define LVALUEtoCELL(v) (*(CELL *)&v)
/*
** PTRtoCELL is a cast through void * intended to satisfy the
** most outrageously pedantic compiler... (I won't mention
** its name)
*/
#define PTRtoCELL (CELL *)(void *)
#define PTRtoSTRING (FICL_STRING *)(void *)
/*
** Strings in FICL are stored in Pascal style - with a count
** preceding the text. We'll also NULL-terminate them so that
** they work with the usual C lib string functions. (Belt &
** suspenders? You decide.)
** STRINGINFO hides the implementation with a couple of
** macros for use in internal routines.
*/
typedef unsigned char FICL_COUNT;
#define FICL_STRING_MAX UCHAR_MAX
typedef struct _ficl_string
{
FICL_COUNT count;
char text[1];
} FICL_STRING;
typedef struct
{
FICL_UNS count;
char *cp;
} STRINGINFO;
#define SI_COUNT(si) (si.count)
#define SI_PTR(si) (si.cp)
#define SI_SETLEN(si, len) (si.count = (FICL_UNS)(len))
#define SI_SETPTR(si, ptr) (si.cp = (char *)(ptr))
/*
** Init a STRINGINFO from a pointer to NULL-terminated string
*/
#define SI_PSZ(si, psz) \
{si.cp = psz; si.count = (FICL_COUNT)strlen(psz);}
/*
** Init a STRINGINFO from a pointer to FICL_STRING
*/
#define SI_PFS(si, pfs) \
{si.cp = pfs->text; si.count = pfs->count;}
/*
** Ficl uses this little structure to hold the address of
** the block of text it's working on and an index to the next
** unconsumed character in the string. Traditionally, this is
** done by a Text Input Buffer, so I've called this struct TIB.
**
** Since this structure also holds the size of the input buffer,
** and since evaluate requires that, let's put the size here.
** The size is stored as an end-pointer because that is what the
** null-terminated string aware functions find most easy to deal
** with.
** Notice, though, that nobody really uses this except evaluate,
** so it might just be moved to FICL_VM instead. (sobral)
*/
typedef struct
{
FICL_INT index;
char *end;
char *cp;
} TIB;
/*
** Stacks get heavy use in Ficl and Forth...
** Each virtual machine implements two of them:
** one holds parameters (data), and the other holds return
** addresses and control flow information for the virtual
** machine. (Note: C's automatic stack is implicitly used,
** but not modeled because it doesn't need to be...)
** Here's an abstract type for a stack
*/
typedef struct _ficlStack
{
FICL_UNS nCells; /* size of the stack */
CELL *pFrame; /* link reg for stack frame */
CELL *sp; /* stack pointer */
CELL base[1]; /* Top of stack */
} FICL_STACK;
/*
** Stack methods... many map closely to required Forth words.
*/
FICL_STACK *stackCreate(unsigned nCells);
void stackDelete(FICL_STACK *pStack);
int stackDepth (FICL_STACK *pStack);
void stackDrop (FICL_STACK *pStack, int n);
CELL stackFetch (FICL_STACK *pStack, int n);
CELL stackGetTop(FICL_STACK *pStack);
void stackLink (FICL_STACK *pStack, int nCells);
void stackPick (FICL_STACK *pStack, int n);
CELL stackPop (FICL_STACK *pStack);
void *stackPopPtr(FICL_STACK *pStack);
FICL_UNS stackPopUNS(FICL_STACK *pStack);
FICL_INT stackPopINT(FICL_STACK *pStack);
void stackPush (FICL_STACK *pStack, CELL c);
void stackPushPtr (FICL_STACK *pStack, void *ptr);
void stackPushUNS(FICL_STACK *pStack, FICL_UNS u);
void stackPushINT(FICL_STACK *pStack, FICL_INT i);
void stackReset (FICL_STACK *pStack);
void stackRoll (FICL_STACK *pStack, int n);
void stackSetTop(FICL_STACK *pStack, CELL c);
void stackStore (FICL_STACK *pStack, int n, CELL c);
void stackUnlink(FICL_STACK *pStack);
#if (FICL_WANT_FLOAT)
float stackPopFloat (FICL_STACK *pStack);
void stackPushFloat(FICL_STACK *pStack, float f);
#endif
/*
** Shortcuts (Guy Carver)
*/
#define PUSHPTR(p) stackPushPtr(pVM->pStack,p)
#define PUSHUNS(u) stackPushUNS(pVM->pStack,u)
#define PUSHINT(i) stackPushINT(pVM->pStack,i)
#define PUSHFLOAT(f) stackPushFloat(pVM->fStack,f)
#define PUSH(c) stackPush(pVM->pStack,c)
#define POPPTR() stackPopPtr(pVM->pStack)
#define POPUNS() stackPopUNS(pVM->pStack)
#define POPINT() stackPopINT(pVM->pStack)
#define POPFLOAT() stackPopFloat(pVM->fStack)
#define POP() stackPop(pVM->pStack)
#define GETTOP() stackGetTop(pVM->pStack)
#define SETTOP(c) stackSetTop(pVM->pStack,LVALUEtoCELL(c))
#define GETTOPF() stackGetTop(pVM->fStack)
#define SETTOPF(c) stackSetTop(pVM->fStack,LVALUEtoCELL(c))
#define STORE(n,c) stackStore(pVM->pStack,n,LVALUEtoCELL(c))
#define DEPTH() stackDepth(pVM->pStack)
#define DROP(n) stackDrop(pVM->pStack,n)
#define DROPF(n) stackDrop(pVM->fStack,n)
#define FETCH(n) stackFetch(pVM->pStack,n)
#define PICK(n) stackPick(pVM->pStack,n)
#define PICKF(n) stackPick(pVM->fStack,n)
#define ROLL(n) stackRoll(pVM->pStack,n)
#define ROLLF(n) stackRoll(pVM->fStack,n)
/*
** The virtual machine (VM) contains the state for one interpreter.
** Defined operations include:
** Create & initialize
** Delete
** Execute a block of text
** Parse a word out of the input stream
** Call return, and branch
** Text output
** Throw an exception
*/
typedef struct ficl_word ** IPTYPE; /* the VM's instruction pointer */
/*
** Each VM has a placeholder for an output function -
** this makes it possible to have each VM do I/O
** through a different device. If you specify no
** OUTFUNC, it defaults to ficlTextOut.
*/
typedef void (*OUTFUNC)(struct vm *pVM, char *text, int fNewline);
/*
** Each VM operates in one of two non-error states: interpreting
** or compiling. When interpreting, words are simply executed.
** When compiling, most words in the input stream have their
** addresses inserted into the word under construction. Some words
** (known as IMMEDIATE) are executed in the compile state, too.
*/
/* values of STATE */
#define INTERPRET 0
#define COMPILE 1
/*
** The pad is a small scratch area for text manipulation. ANS Forth
** requires it to hold at least 84 characters.
*/
#if !defined nPAD
#define nPAD 256
#endif
/*
** ANS Forth requires that a word's name contain {1..31} characters.
*/
#if !defined nFICLNAME
#define nFICLNAME 31
#endif
/*
** OK - now we can really define the VM...
*/
typedef struct vm
{
FICL_SYSTEM *pSys; /* Which system this VM belongs to */
struct vm *link; /* Ficl keeps a VM list for simple teardown */
jmp_buf *pState; /* crude exception mechanism... */
OUTFUNC textOut; /* Output callback - see sysdep.c */
void * pExtend; /* vm extension pointer */
short fRestart; /* Set TRUE to restart runningWord */
IPTYPE ip; /* instruction pointer */
struct ficl_word
*runningWord;/* address of currently running word (often just *(ip-1) ) */
FICL_UNS state; /* compiling or interpreting */
FICL_UNS base; /* number conversion base */
FICL_STACK *pStack; /* param stack */
FICL_STACK *rStack; /* return stack */
#if FICL_WANT_FLOAT
FICL_STACK *fStack; /* float stack (optional) */
#endif
CELL sourceID; /* -1 if string, 0 if normal input */
TIB tib; /* address of incoming text string */
#if FICL_WANT_USER
CELL user[FICL_USER_CELLS];
#endif
char pad[nPAD]; /* the scratch area (see above) */
} FICL_VM;
/*
** A FICL_CODE points to a function that gets called to help execute
** a word in the dictionary. It always gets passed a pointer to the
** running virtual machine, and from there it can get the address
** of the parameter area of the word it's supposed to operate on.
** For precompiled words, the code is all there is. For user defined
** words, the code assumes that the word's parameter area is a list
** of pointers to the code fields of other words to execute, and
** may also contain inline data. The first parameter is always
** a pointer to a code field.
*/
typedef void (*FICL_CODE)(FICL_VM *pVm);
#if 0
#define VM_ASSERT(pVM) assert((*(pVM->ip - 1)) == pVM->runningWord)
#else
#define VM_ASSERT(pVM)
#endif
/*
** Ficl models memory as a contiguous space divided into
** words in a linked list called the dictionary.
** A FICL_WORD starts each entry in the list.
** Version 1.02: space for the name characters is allotted from
** the dictionary ahead of the word struct - this saves about half
** the storage on average with very little runtime cost.
*/
typedef struct ficl_word
{
struct ficl_word *link; /* Previous word in the dictionary */
UNS16 hash;
UNS8 flags; /* Immediate, Smudge, Compile-only */
FICL_COUNT nName; /* Number of chars in word name */
char *name; /* First nFICLNAME chars of word name */
FICL_CODE code; /* Native code to execute the word */
CELL param[1]; /* First data cell of the word */
} FICL_WORD;
/*
** Worst-case size of a word header: nFICLNAME chars in name
*/
#define CELLS_PER_WORD \
( (sizeof (FICL_WORD) + nFICLNAME + sizeof (CELL)) \
/ (sizeof (CELL)) )
int wordIsImmediate(FICL_WORD *pFW);
int wordIsCompileOnly(FICL_WORD *pFW);
/* flag values for word header */
#define FW_IMMEDIATE 1 /* execute me even if compiling */
#define FW_COMPILE 2 /* error if executed when not compiling */
#define FW_SMUDGE 4 /* definition in progress - hide me */
#define FW_COMPIMMED (FW_IMMEDIATE | FW_COMPILE)
#define FW_DEFAULT 0
/*
** Exit codes for vmThrow
*/
#define VM_INNEREXIT -256 /* tell ficlExecXT to exit inner loop */
#define VM_OUTOFTEXT -257 /* hungry - normal exit */
#define VM_RESTART -258 /* word needs more text to succeed - re-run it */
#define VM_USEREXIT -259 /* user wants to quit */
#define VM_ERREXIT -260 /* interp found an error */
#define VM_BREAK -261 /* debugger breakpoint */
#define VM_ABORT -1 /* like errexit -- abort */
#define VM_ABORTQ -2 /* like errexit -- abort" */
#define VM_QUIT -56 /* like errexit, but leave pStack & base alone */
void vmBranchRelative(FICL_VM *pVM, int offset);
FICL_VM * vmCreate (FICL_VM *pVM, unsigned nPStack, unsigned nRStack);
void vmDelete (FICL_VM *pVM);
void vmExecute(FICL_VM *pVM, FICL_WORD *pWord);
char * vmGetString(FICL_VM *pVM, FICL_STRING *spDest, char delimiter);
STRINGINFO vmGetWord(FICL_VM *pVM);
STRINGINFO vmGetWord0(FICL_VM *pVM);
int vmGetWordToPad(FICL_VM *pVM);
STRINGINFO vmParseString(FICL_VM *pVM, char delimiter);
STRINGINFO vmParseStringEx(FICL_VM *pVM, char delimiter, char fSkipLeading);
CELL vmPop(FICL_VM *pVM);
void vmPush(FICL_VM *pVM, CELL c);
void vmPopIP (FICL_VM *pVM);
void vmPushIP (FICL_VM *pVM, IPTYPE newIP);
void vmQuit (FICL_VM *pVM);
void vmReset (FICL_VM *pVM);
void vmSetTextOut(FICL_VM *pVM, OUTFUNC textOut);
#if FICL_WANT_DEBUGGER
void vmStep(FICL_VM *pVM);
#endif
void vmTextOut(FICL_VM *pVM, char *text, int fNewline);
void vmThrow (FICL_VM *pVM, int except);
void vmThrowErr(FICL_VM *pVM, char *fmt, ...);
#define vmGetRunningWord(pVM) ((pVM)->runningWord)
/*
** The inner interpreter - coded as a macro (see note for
** INLINE_INNER_LOOP in sysdep.h for complaints about VC++ 5
*/
#define M_VM_STEP(pVM) \
FICL_WORD *tempFW = *(pVM)->ip++; \
(pVM)->runningWord = tempFW; \
tempFW->code(pVM); \
#define M_INNER_LOOP(pVM) \
for (;;) { M_VM_STEP(pVM) }
#if INLINE_INNER_LOOP != 0
#define vmInnerLoop(pVM) M_INNER_LOOP(pVM)
#else
void vmInnerLoop(FICL_VM *pVM);
#endif
/*
** vmCheckStack needs a vm pointer because it might have to say
** something if it finds a problem. Parms popCells and pushCells
** correspond to the number of parameters on the left and right of
** a word's stack effect comment.
*/
void vmCheckStack(FICL_VM *pVM, int popCells, int pushCells);
#if FICL_WANT_FLOAT
void vmCheckFStack(FICL_VM *pVM, int popCells, int pushCells);
#endif
/*
** TIB access routines...
** ANS forth seems to require the input buffer to be represented
** as a pointer to the start of the buffer, and an index to the
** next character to read.
** PushTib points the VM to a new input string and optionally
** returns a copy of the current state
** PopTib restores the TIB state given a saved TIB from PushTib
** GetInBuf returns a pointer to the next unused char of the TIB
*/
void vmPushTib(FICL_VM *pVM, char *text, FICL_INT nChars, TIB *pSaveTib);
void vmPopTib(FICL_VM *pVM, TIB *pTib);
#define vmGetInBuf(pVM) ((pVM)->tib.cp + (pVM)->tib.index)
#define vmGetInBufLen(pVM) ((pVM)->tib.end - (pVM)->tib.cp)
#define vmGetInBufEnd(pVM) ((pVM)->tib.end)
#define vmGetTibIndex(pVM) (pVM)->tib.index
#define vmSetTibIndex(pVM, i) (pVM)->tib.index = i
#define vmUpdateTib(pVM, str) (pVM)->tib.index = (str) - (pVM)->tib.cp
/*
** Generally useful string manipulators omitted by ANSI C...
** ltoa complements strtol
*/
#if defined(_WIN32) && !FICL_MAIN
/* #SHEESH
** Why do Microsoft Meatballs insist on contaminating
** my namespace with their string functions???
*/
#pragma warning(disable: 4273)
#endif
int isPowerOfTwo(FICL_UNS u);
char *ltoa( FICL_INT value, char *string, int radix );
char *ultoa(FICL_UNS value, char *string, int radix );
char digit_to_char(int value);
char *strrev( char *string );
char *skipSpace(char *cp, char *end);
char *caseFold(char *cp);
int strincmp(char *cp1, char *cp2, FICL_UNS count);
#if defined(_WIN32) && !FICL_MAIN
#pragma warning(default: 4273)
#endif
/*
** Ficl hash table - variable size.
** assert(size > 0)
** If size is 1, the table degenerates into a linked list.
** A WORDLIST (see the search order word set in DPANS) is
** just a pointer to a FICL_HASH in this implementation.
*/
#if !defined HASHSIZE /* Default size of hash table. For most uniform */
#define HASHSIZE 241 /* performance, use a prime number! */
#endif
typedef struct ficl_hash
{
struct ficl_hash *link; /* link to parent class wordlist for OO */
char *name; /* optional pointer to \0 terminated wordlist name */
unsigned size; /* number of buckets in the hash */
FICL_WORD *table[1];
} FICL_HASH;
void hashForget(FICL_HASH *pHash, void *where);
UNS16 hashHashCode(STRINGINFO si);
void hashInsertWord(FICL_HASH *pHash, FICL_WORD *pFW);
FICL_WORD *hashLookup(struct ficl_hash *pHash,
STRINGINFO si,
UNS16 hashCode);
void hashReset(FICL_HASH *pHash);
/*
** A Dictionary is a linked list of FICL_WORDs. It is also Ficl's
** memory model. Description of fields:
**
** here -- points to the next free byte in the dictionary. This
** pointer is forced to be CELL-aligned before a definition is added.
** Do not assume any specific alignment otherwise - Use dictAlign().
**
** smudge -- pointer to word currently being defined (or last defined word)
** If the definition completes successfully, the word will be
** linked into the hash table. If unsuccessful, dictUnsmudge
** uses this pointer to restore the previous state of the dictionary.
** Smudge prevents unintentional recursion as a side-effect: the
** dictionary search algo examines only completed definitions, so a
** word cannot invoke itself by name. See the ficl word "recurse".
** NOTE: smudge always points to the last word defined. IMMEDIATE
** makes use of this fact. Smudge is initially NULL.
**
** pForthWords -- pointer to the default wordlist (FICL_HASH).
** This is the initial compilation list, and contains all
** ficl's precompiled words.
**
** pCompile -- compilation wordlist - initially equal to pForthWords
** pSearch -- array of pointers to wordlists. Managed as a stack.
** Highest index is the first list in the search order.
** nLists -- number of lists in pSearch. nLists-1 is the highest
** filled slot in pSearch, and points to the first wordlist
** in the search order
** size -- number of cells in the dictionary (total)
** dict -- start of data area. Must be at the end of the struct.
*/
typedef struct ficl_dict
{
CELL *here;
FICL_WORD *smudge;
FICL_HASH *pForthWords;
FICL_HASH *pCompile;
FICL_HASH *pSearch[FICL_DEFAULT_VOCS];
int nLists;
unsigned size; /* Number of cells in dict (total)*/
CELL *dict; /* Base of dictionary memory */
} FICL_DICT;
void *alignPtr(void *ptr);
void dictAbortDefinition(FICL_DICT *pDict);
void dictAlign(FICL_DICT *pDict);
int dictAllot(FICL_DICT *pDict, int n);
int dictAllotCells(FICL_DICT *pDict, int nCells);
void dictAppendCell(FICL_DICT *pDict, CELL c);
void dictAppendChar(FICL_DICT *pDict, char c);
FICL_WORD *dictAppendWord(FICL_DICT *pDict,
char *name,
FICL_CODE pCode,
UNS8 flags);
FICL_WORD *dictAppendWord2(FICL_DICT *pDict,
STRINGINFO si,
FICL_CODE pCode,
UNS8 flags);
void dictAppendUNS(FICL_DICT *pDict, FICL_UNS u);
int dictCellsAvail(FICL_DICT *pDict);
int dictCellsUsed (FICL_DICT *pDict);
void dictCheck(FICL_DICT *pDict, FICL_VM *pVM, int nCells);
FICL_DICT *dictCreate(unsigned nCELLS);
FICL_DICT *dictCreateHashed(unsigned nCells, unsigned nHash);
FICL_HASH *dictCreateWordlist(FICL_DICT *dp, int nBuckets);
void dictDelete(FICL_DICT *pDict);
void dictEmpty(FICL_DICT *pDict, unsigned nHash);
int dictIncludes(FICL_DICT *pDict, void *p);
FICL_WORD *dictLookup(FICL_DICT *pDict, STRINGINFO si);
#if FICL_WANT_LOCALS
FICL_WORD *dictLookupLoc(FICL_DICT *pDict, STRINGINFO si);
#endif
void dictResetSearchOrder(FICL_DICT *pDict);
void dictSetFlags(FICL_DICT *pDict, UNS8 set, UNS8 clr);
void dictSetImmediate(FICL_DICT *pDict);
void dictUnsmudge(FICL_DICT *pDict);
CELL *dictWhere(FICL_DICT *pDict);
/*
** P A R S E S T E P
** (New for 2.05)
** See words.c: interpWord
** By default, ficl goes through two attempts to parse each token from its input
** stream: it first attempts to match it with a word in the dictionary, and
** if that fails, it attempts to convert it into a number. This mechanism is now
** extensible by additional steps. This allows extensions like floating point and
** double number support to be factored cleanly.
**
** Each parse step is a function that receives the next input token as a STRINGINFO.
** If the parse step matches the token, it must apply semantics to the token appropriate
** to the present value of VM.state (compiling or interpreting), and return FICL_TRUE.
** Otherwise it returns FICL_FALSE. See words.c: isNumber for an example
**
** Note: for the sake of efficiency, it's a good idea both to limit the number
** of parse steps and to code each parse step so that it rejects tokens that
** do not match as quickly as possible.
*/
typedef int (*FICL_PARSE_STEP)(FICL_VM *pVM, STRINGINFO si);
/*
** Appends a parse step function to the end of the parse list (see
** FICL_PARSE_STEP notes in ficl.h for details). Returns 0 if successful,
** nonzero if there's no more room in the list. Each parse step is a word in
** the dictionary. Precompiled parse steps can use (PARSE-STEP) as their
** CFA - see parenParseStep in words.c.
*/
int ficlAddParseStep(FICL_SYSTEM *pSys, FICL_WORD *pFW); /* ficl.c */
void ficlAddPrecompiledParseStep(FICL_SYSTEM *pSys, char *name, FICL_PARSE_STEP pStep);
void ficlListParseSteps(FICL_VM *pVM);
/*
** F I C L _ S Y S T E M
** The top level data structure of the system - ficl_system ties a list of
** virtual machines with their corresponding dictionaries. Ficl 3.0 will
** support multiple Ficl systems, allowing multiple concurrent sessions
** to separate dictionaries with some constraints.
** The present model allows multiple sessions to one dictionary provided
** you implement ficlLockDictionary() as specified in sysdep.h
**
** RESTRICTIONS: due to the use of static variables in words.c for compiling
** comtrol structures faster, if you use multiple ficl systems these variables
** will point into the most recently initialized dictionary - this is probably
** not a problem provided the precompiled dictionaries are identical for
** all systems.
*/
struct ficl_system
{
FICL_SYSTEM *link;
FICL_WORD *parseList[FICL_MAX_PARSE_STEPS];
FICL_VM *vmList;
FICL_DICT *dp;
FICL_DICT *envp;
#ifdef FICL_WANT_LOCALS
FICL_DICT *localp;
#endif
FICL_WORD *pInterp[3];
};
/*
** External interface to FICL...
*/
/*
** f i c l I n i t S y s t e m
** Binds a global dictionary to the interpreter system and initializes
** the dict to contain the ANSI CORE wordset.
** You specify the address and size of the allocated area.
** After that, ficl manages it.
** First step is to set up the static pointers to the area.
** Then write the "precompiled" portion of the dictionary in.
** The dictionary needs to be at least large enough to hold the
** precompiled part. Try 1K cells minimum. Use "words" to find
** out how much of the dictionary is used at any time.
*/
void ficlInitSystem(int nDictCells);
/*
** f i c l T e r m S y s t e m
** Deletes the system dictionary and all virtual machines that
** were created with ficlNewVM (see below). Call this function to
** reclaim all memory used by the dictionary and VMs.
*/
void ficlTermSystem(void);
/*
** f i c l E x e c
** Evaluates a block of input text in the context of the
** specified interpreter. Emits any requested output to the
** interpreter's output function. If the input string is NULL
** terminated, you can pass -1 as nChars rather than count it.
** Execution returns when the text block has been executed,
** or an error occurs.
** Returns one of the VM_XXXX codes defined in ficl.h:
** VM_OUTOFTEXT is the normal exit condition
** VM_ERREXIT means that the interp encountered a syntax error
** and the vm has been reset to recover (some or all
** of the text block got ignored
** VM_USEREXIT means that the user executed the "bye" command
** to shut down the interpreter. This would be a good
** time to delete the vm, etc -- or you can ignore this
** signal.
** VM_ABORT and VM_ABORTQ are generated by 'abort' and 'abort"'
** commands.
** Preconditions: successful execution of ficlInitSystem,
** Successful creation and init of the VM by ficlNewVM (or equiv)
*/
int ficlExec (FICL_VM *pVM, char *pText);
int ficlExecC(FICL_VM *pVM, char *pText, FICL_INT nChars);
int ficlExecXT(FICL_VM *pVM, FICL_WORD *pWord);
/*
** ficlExecFD(FICL_VM *pVM, int fd);
* Evaluates text from file passed in via fd.
* Execution returns when all of file has been executed or an
* error occurs.
*/
int ficlExecFD(FICL_VM *pVM, int fd);
/*
** Create a new VM from the heap, and link it into the system VM list.
** Initializes the VM and binds default sized stacks to it. Returns the
** address of the VM, or NULL if an error occurs.
** Precondition: successful execution of ficlInitSystem
*/
FICL_VM *ficlNewVM(void);
/*
** Force deletion of a VM. You do not need to do this
** unless you're creating and discarding a lot of VMs.
** For systems that use a constant pool of VMs for the life
** of the system, ficltermSystem takes care of VM cleanup
** automatically.
*/
void ficlFreeVM(FICL_VM *pVM);
/*
** Set the stack sizes (return and parameter) to be used for all
** subsequently created VMs. Returns actual stack size to be used.
*/
int ficlSetStackSize(int nStackCells);
/*
** Returns the address of the most recently defined word in the system
** dictionary with the given name, or NULL if no match.
** Precondition: successful execution of ficlInitSystem
*/
FICL_WORD *ficlLookup(char *name);
/*
** f i c l G e t D i c t
** Utility function - returns the address of the system dictionary.
** Precondition: successful execution of ficlInitSystem
*/
FICL_DICT *ficlGetDict(void);
FICL_DICT *ficlGetEnv(void);
void ficlSetEnv(char *name, FICL_UNS value);
void ficlSetEnvD(char *name, FICL_UNS hi, FICL_UNS lo);
#if FICL_WANT_LOCALS
FICL_DICT *ficlGetLoc(void);
#endif
/*
** f i c l B u i l d
** Builds a word into the system default dictionary in a thread-safe way.
** Preconditions: system must be initialized, and there must
** be enough space for the new word's header! Operation is
** controlled by ficlLockDictionary, so any initialization
** required by your version of the function (if you "overrode"
** it) must be complete at this point.
** Parameters:
** name -- the name of the word to be built
** code -- code to execute when the word is invoked - must take a single param
** pointer to a FICL_VM
** flags -- 0 or more of FW_IMMEDIATE, FW_COMPILE, use bitwise OR!
** Most words can use FW_DEFAULT.
** nAllot - number of extra cells to allocate in the parameter area (usually zero)
*/
int ficlBuild(char *name, FICL_CODE code, char flags);
/*
** f i c l C o m p i l e C o r e
** Builds the ANS CORE wordset into the dictionary - called by
** ficlInitSystem - no need to waste dict space by doing it again.
*/
void ficlCompileCore(FICL_SYSTEM *pSys);
void ficlCompilePrefix(FICL_SYSTEM *pSys);
void ficlCompileSearch(FICL_SYSTEM *pSys);
void ficlCompileSoftCore(FICL_SYSTEM *pSys);
void ficlCompileTools(FICL_SYSTEM *pSys);
#if FICL_WANT_FLOAT
void ficlCompileFloat(FICL_SYSTEM *pSys);
#endif
#if FICL_PLATFORM_EXTEND
void ficlCompilePlatform(FICL_SYSTEM *pSys);
#endif
/*
** from words.c...
*/
void constantParen(FICL_VM *pVM);
void twoConstParen(FICL_VM *pVM);
int ficlParseNumber(FICL_VM *pVM, STRINGINFO si);
void ficlTick(FICL_VM *pVM);
void parseStepParen(FICL_VM *pVM);
/*
** From tools.c
*/
int isAFiclWord(FICL_WORD *pFW);
/*
** The following supports SEE and the debugger.
*/
typedef enum
{
BRANCH,
COLON,
CONSTANT,
CREATE,
DO,
DOES,
IF,
LITERAL,
LOOP,
PLOOP,
PRIMITIVE,
QDO,
STRINGLIT,
USER,
VARIABLE,
} WORDKIND;
WORDKIND ficlWordClassify(FICL_WORD *pFW);
/*
** Dictionary on-demand resizing
*/
extern unsigned int dictThreshold;
extern unsigned int dictIncrease;
/*
** Various FreeBSD goodies
*/
#if defined(__i386__) && !defined(TESTMAIN)
extern void ficlOutb(FICL_VM *pVM);
extern void ficlInb(FICL_VM *pVM);
#endif
#if !defined(TESTMAIN)
extern void ficlSetenv(FICL_VM *pVM);
extern void ficlSetenvq(FICL_VM *pVM);
extern void ficlGetenv(FICL_VM *pVM);
extern void ficlUnsetenv(FICL_VM *pVM);
extern void ficlCopyin(FICL_VM *pVM);
extern void ficlCopyout(FICL_VM *pVM);
extern void ficlFindfile(FICL_VM *pVM);
extern void ficlPnpdevices(FICL_VM *pVM);
extern void ficlPnphandlers(FICL_VM *pVM);
extern void ficlCcall(FICL_VM *pVM);
#endif
#ifdef __cplusplus
}
#endif
#endif /* __FICL_H__ */
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