7fd9a6a23a
also don't use ANSI string concatenation.
306 lines
9.3 KiB
C
306 lines
9.3 KiB
C
/*
|
|
* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
|
|
* All rights reserved.
|
|
*
|
|
* 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include <sys/param.h> /* to pick up __FreeBSD_version */
|
|
#include <string.h>
|
|
#include <stand.h>
|
|
#include "bootstrap.h"
|
|
#include "ficl.h"
|
|
|
|
extern char bootprog_rev[];
|
|
|
|
/* #define BFORTH_DEBUG */
|
|
|
|
#ifdef BFORTH_DEBUG
|
|
# define DEBUG(fmt, args...) printf("%s: " fmt "\n" , __func__ , ## args)
|
|
#else
|
|
# define DEBUG(fmt, args...)
|
|
#endif
|
|
|
|
/*
|
|
* Eventually, all builtin commands throw codes must be defined
|
|
* elsewhere, possibly bootstrap.h. For now, just this code, used
|
|
* just in this file, it is getting defined.
|
|
*/
|
|
#define BF_PARSE 100
|
|
|
|
/*
|
|
* BootForth Interface to Ficl Forth interpreter.
|
|
*/
|
|
|
|
FICL_VM *bf_vm;
|
|
FICL_WORD *pInterp;
|
|
|
|
/*
|
|
* Shim for taking commands from BF and passing them out to 'standard'
|
|
* argv/argc command functions.
|
|
*/
|
|
static void
|
|
bf_command(FICL_VM *vm)
|
|
{
|
|
char *name, *line, *tail, *cp;
|
|
size_t len;
|
|
struct bootblk_command **cmdp;
|
|
bootblk_cmd_t *cmd;
|
|
int nstrings, i;
|
|
int argc, result;
|
|
char **argv;
|
|
|
|
/* Get the name of the current word */
|
|
name = vm->runningWord->name;
|
|
|
|
/* Find our command structure */
|
|
cmd = NULL;
|
|
SET_FOREACH(cmdp, Xcommand_set) {
|
|
if (((*cmdp)->c_name != NULL) && !strcmp(name, (*cmdp)->c_name))
|
|
cmd = (*cmdp)->c_fn;
|
|
}
|
|
if (cmd == NULL)
|
|
panic("callout for unknown command '%s'", name);
|
|
|
|
/* Check whether we have been compiled or are being interpreted */
|
|
if (stackPopINT(vm->pStack)) {
|
|
/*
|
|
* Get parameters from stack, in the format:
|
|
* an un ... a2 u2 a1 u1 n --
|
|
* Where n is the number of strings, a/u are pairs of
|
|
* address/size for strings, and they will be concatenated
|
|
* in LIFO order.
|
|
*/
|
|
nstrings = stackPopINT(vm->pStack);
|
|
for (i = 0, len = 0; i < nstrings; i++)
|
|
len += stackFetch(vm->pStack, i * 2).i + 1;
|
|
line = malloc(strlen(name) + len + 1);
|
|
strcpy(line, name);
|
|
|
|
if (nstrings)
|
|
for (i = 0; i < nstrings; i++) {
|
|
len = stackPopINT(vm->pStack);
|
|
cp = stackPopPtr(vm->pStack);
|
|
strcat(line, " ");
|
|
strncat(line, cp, len);
|
|
}
|
|
} else {
|
|
/* Get remainder of invocation */
|
|
tail = vmGetInBuf(vm);
|
|
for (cp = tail, len = 0; cp != vm->tib.end && *cp != 0 && *cp != '\n'; cp++, len++)
|
|
;
|
|
|
|
line = malloc(strlen(name) + len + 2);
|
|
strcpy(line, name);
|
|
if (len > 0) {
|
|
strcat(line, " ");
|
|
strncat(line, tail, len);
|
|
vmUpdateTib(vm, tail + len);
|
|
}
|
|
}
|
|
DEBUG("cmd '%s'", line);
|
|
|
|
command_errmsg = command_errbuf;
|
|
command_errbuf[0] = 0;
|
|
if (!parse(&argc, &argv, line)) {
|
|
result = (cmd)(argc, argv);
|
|
free(argv);
|
|
} else {
|
|
result=BF_PARSE;
|
|
}
|
|
free(line);
|
|
/* This is going to be thrown!!! */
|
|
stackPushINT(vm->pStack,result);
|
|
}
|
|
|
|
/*
|
|
* Replace a word definition (a builtin command) with another
|
|
* one that:
|
|
*
|
|
* - Throw error results instead of returning them on the stack
|
|
* - Pass a flag indicating whether the word was compiled or is
|
|
* being interpreted.
|
|
*
|
|
* There is one major problem with builtins that cannot be overcome
|
|
* in anyway, except by outlawing it. We want builtins to behave
|
|
* differently depending on whether they have been compiled or they
|
|
* are being interpreted. Notice that this is *not* the interpreter's
|
|
* current state. For example:
|
|
*
|
|
* : example ls ; immediate
|
|
* : problem example ; \ "ls" gets executed while compiling
|
|
* example \ "ls" gets executed while interpreting
|
|
*
|
|
* Notice that, though the current state is different in the two
|
|
* invocations of "example", in both cases "ls" has been
|
|
* *compiled in*, which is what we really want.
|
|
*
|
|
* The problem arises when you tick the builtin. For example:
|
|
*
|
|
* : example-1 ['] ls postpone literal ; immediate
|
|
* : example-2 example-1 execute ; immediate
|
|
* : problem example-2 ;
|
|
* example-2
|
|
*
|
|
* We have no way, when we get EXECUTEd, of knowing what our behavior
|
|
* should be. Thus, our only alternative is to "outlaw" this. See RFI
|
|
* 0007, and ANS Forth Standard's appendix D, item 6.7 for a related
|
|
* problem, concerning compile semantics.
|
|
*
|
|
* The problem is compounded by the fact that "' builtin CATCH" is valid
|
|
* and desirable. The only solution is to create an intermediary word.
|
|
* For example:
|
|
*
|
|
* : my-ls ls ;
|
|
* : example ['] my-ls catch ;
|
|
*
|
|
* So, with the below implementation, here is a summary of the behavior
|
|
* of builtins:
|
|
*
|
|
* ls -l \ "interpret" behavior, ie,
|
|
* \ takes parameters from TIB
|
|
* : ex-1 s" -l" 1 ls ; \ "compile" behavior, ie,
|
|
* \ takes parameters from the stack
|
|
* : ex-2 ['] ls catch ; immediate \ undefined behavior
|
|
* : ex-3 ['] ls catch ; \ undefined behavior
|
|
* ex-2 ex-3 \ "interpret" behavior,
|
|
* \ catch works
|
|
* : ex-4 ex-2 ; \ "compile" behavior,
|
|
* \ catch does not work
|
|
* : ex-5 ex-3 ; immediate \ same as ex-2
|
|
* : ex-6 ex-3 ; \ same as ex-3
|
|
* : ex-7 ['] ex-1 catch ; \ "compile" behavior,
|
|
* \ catch works
|
|
* : ex-8 postpone ls ; immediate \ same as ex-2
|
|
* : ex-9 postpone ls ; \ same as ex-3
|
|
*
|
|
* As the definition below is particularly tricky, and it's side effects
|
|
* must be well understood by those playing with it, I'll be heavy on
|
|
* the comments.
|
|
*
|
|
* (if you edit this definition, pay attention to trailing spaces after
|
|
* each word -- I warned you! :-) )
|
|
*/
|
|
#define BUILTIN_CONSTRUCTOR \
|
|
": builtin: " \
|
|
">in @ " /* save the tib index pointer */ \
|
|
"' " /* get next word's xt */ \
|
|
"swap >in ! " /* point again to next word */ \
|
|
"create " /* create a new definition of the next word */ \
|
|
", " /* save previous definition's xt */ \
|
|
"immediate " /* make the new definition an immediate word */ \
|
|
\
|
|
"does> " /* Now, the *new* definition will: */ \
|
|
"state @ if " /* if in compiling state: */ \
|
|
"1 postpone literal " /* pass 1 flag to indicate compile */ \
|
|
"@ compile, " /* compile in previous definition */ \
|
|
"postpone throw " /* throw stack-returned result */ \
|
|
"else " /* if in interpreting state: */ \
|
|
"0 swap " /* pass 0 flag to indicate interpret */ \
|
|
"@ execute " /* call previous definition */ \
|
|
"throw " /* throw stack-returned result */ \
|
|
"then ; "
|
|
|
|
/*
|
|
* Initialise the Forth interpreter, create all our commands as words.
|
|
*/
|
|
void
|
|
bf_init(void)
|
|
{
|
|
struct bootblk_command **cmdp;
|
|
char create_buf[41]; /* 31 characters-long builtins */
|
|
int fd;
|
|
|
|
ficlInitSystem(10000); /* Default dictionary ~4000 cells */
|
|
bf_vm = ficlNewVM();
|
|
|
|
/* Put all private definitions in a "builtins" vocabulary */
|
|
ficlExec(bf_vm, "vocabulary builtins also builtins definitions");
|
|
|
|
/* Builtin constructor word */
|
|
ficlExec(bf_vm, BUILTIN_CONSTRUCTOR);
|
|
|
|
/* make all commands appear as Forth words */
|
|
SET_FOREACH(cmdp, Xcommand_set) {
|
|
ficlBuild((*cmdp)->c_name, bf_command, FW_DEFAULT);
|
|
ficlExec(bf_vm, "forth definitions builtins");
|
|
sprintf(create_buf, "builtin: %s", (*cmdp)->c_name);
|
|
ficlExec(bf_vm, create_buf);
|
|
ficlExec(bf_vm, "builtins definitions");
|
|
}
|
|
ficlExec(bf_vm, "only forth definitions");
|
|
|
|
/* Export some version numbers so that code can detect the loader/host version */
|
|
ficlSetEnv("FreeBSD_version", __FreeBSD_version);
|
|
ficlSetEnv("loader_version",
|
|
(bootprog_rev[0] - '0') * 10 + (bootprog_rev[2] - '0'));
|
|
|
|
/* try to load and run init file if present */
|
|
if ((fd = open("/boot/boot.4th", O_RDONLY)) != -1) {
|
|
(void)ficlExecFD(bf_vm, fd);
|
|
close(fd);
|
|
}
|
|
|
|
/* Do this last, so /boot/boot.4th can change it */
|
|
pInterp = ficlLookup("interpret");
|
|
}
|
|
|
|
/*
|
|
* Feed a line of user input to the Forth interpreter
|
|
*/
|
|
int
|
|
bf_run(char *line)
|
|
{
|
|
int result;
|
|
|
|
result = ficlExec(bf_vm, line);
|
|
|
|
DEBUG("ficlExec '%s' = %d", line, result);
|
|
switch (result) {
|
|
case VM_OUTOFTEXT:
|
|
case VM_ABORTQ:
|
|
case VM_QUIT:
|
|
case VM_ERREXIT:
|
|
break;
|
|
case VM_USEREXIT:
|
|
printf("No where to leave to!\n");
|
|
break;
|
|
case VM_ABORT:
|
|
printf("Aborted!\n");
|
|
break;
|
|
case BF_PARSE:
|
|
printf("Parse error!\n");
|
|
break;
|
|
default:
|
|
/* Hopefully, all other codes filled this buffer */
|
|
printf("%s\n", command_errmsg);
|
|
}
|
|
|
|
if (result == VM_USEREXIT)
|
|
panic("interpreter exit");
|
|
setenv("interpret", bf_vm->state ? "" : "OK", 1);
|
|
|
|
return result;
|
|
}
|