Make use of prototypes to silence warnings.
Change include() so it will be able to load files with forth code, instead of just builtins. Remove #@- from the include section of the help file, since they don't work in the new version of include, unless BOOT_FORTH is not defined. Change bf_run() so it will return the result returned by ficlExec(). Also, make bf_run() push "interpret" to be executed by ficlExec(), since ficlExec() doesn't do it by itself. (Things worked previously because nothing recursed through ficlExec() by the way of bf_run()). Change/extend comments on builtin behavior. Search for "interpret" at the end of bf_init(), so /boot/boot.4th can provide it's own version. Remove dead code.
This commit is contained in:
Daniel C. Sobral
parent
099d325dd5
commit
47749087ac
@ -23,7 +23,7 @@
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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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* $Id: bootstrap.h,v 1.18 1999/01/16 03:25:24 jdp Exp $
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* $Id: bootstrap.h,v 1.19 1999/01/22 23:50:13 msmith Exp $
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*/
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#include <sys/types.h>
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@ -61,6 +61,10 @@ extern int include(char *filename);
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/* interp_parse.c */
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extern int parse(int *argc, char ***argv, char *str);
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/* interp_forth.c */
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extern void bf_init(void);
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extern int bf_run(char *line);
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/* boot.c */
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extern int autoboot(int delay, char *prompt);
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extern void autoboot_maybe(void);
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@ -71,6 +75,9 @@ extern void hexdump(caddr_t region, size_t len);
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extern size_t strlenout(vm_offset_t str);
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extern char *strdupout(vm_offset_t str);
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/* bcache.c */
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extern int bcache_init(int nblks, size_t bsize);
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/*
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* Disk block cache
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*/
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@ -260,16 +260,6 @@
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The entire contents of <filename> are read into memory before executing
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commands, so it is safe to source a file from removable media.
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A number of modifiers may be prefixed to commands within a script file
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to alter their behaviour:
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# Ignore the line (use for comments).
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@ Suppresses the printing of the command when executed.
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- Prevents the script from terminating if the command returns
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an error.
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################################################################################
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# Tread DRead input from the terminal
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@ -23,7 +23,7 @@
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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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* $Id: interp.c,v 1.12 1999/01/15 00:31:45 abial Exp $
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* $Id: interp.c,v 1.13 1999/01/22 23:50:13 msmith Exp $
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*/
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/*
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* Simple commandline interpreter, toplevel and misc.
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@ -170,9 +170,15 @@ include(char *filename)
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{
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struct includeline *script, *se, *sp;
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char input[256]; /* big enough? */
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#ifdef BOOT_FORTH
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int res;
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char *cp;
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int fd, line;
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#else
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int argc,res;
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char **argv, *cp;
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int fd, flags, line;
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#endif
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if (((fd = open(filename, O_RDONLY)) == -1)) {
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sprintf(command_errbuf,"can't open '%s': %s\n", filename, strerror(errno));
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@ -187,6 +193,9 @@ include(char *filename)
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while (fgetstr(input, sizeof(input), fd) > 0) {
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line++;
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#ifdef BOOT_FORTH
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cp = input;
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#else
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flags = 0;
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/* Discard comments */
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if (input[0] == '#')
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@ -202,11 +211,14 @@ include(char *filename)
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cp++;
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flags |= SL_IGNOREERR;
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}
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#endif
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/* Allocate script line structure and copy line, flags */
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sp = malloc(sizeof(struct includeline) + strlen(cp) + 1);
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sp->text = (char *)sp + sizeof(struct includeline);
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strcpy(sp->text, cp);
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#ifndef BOOT_FORTH
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sp->flags = flags;
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#endif
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sp->line = line;
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sp->next = NULL;
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@ -222,10 +234,21 @@ include(char *filename)
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/*
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* Execute the script
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*/
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#ifndef BOOT_FORTH
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argv = NULL;
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#endif
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res = CMD_OK;
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for (sp = script; sp != NULL; sp = sp->next) {
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#ifdef BOOT_FORTH
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res = bf_run(sp->text);
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if (res != VM_OUTOFTEXT) {
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sprintf(command_errbuf, "Error while including %s:\n%s", filename, sp->text);
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res = CMD_ERROR;
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break;
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} else
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res = CMD_OK;
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#else
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/* print if not being quiet */
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if (!(sp->flags & SL_QUIET)) {
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prompt();
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@ -249,9 +272,12 @@ include(char *filename)
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res=CMD_ERROR;
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break;
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}
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#endif
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}
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#ifndef BOOT_FORTH
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if (argv != NULL)
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free(argv);
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#endif
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while(script != NULL) {
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se = script;
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script = script->next;
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@ -23,7 +23,7 @@
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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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* $Id: interp_forth.c,v 1.10 1999/01/22 23:50:14 msmith Exp $
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* $Id: interp_forth.c,v 1.11 1999/01/28 06:33:03 jkh Exp $
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*/
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#include <sys/param.h> /* to pick up __FreeBSD_version */
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@ -54,6 +54,7 @@ extern char bootprog_rev[];
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*/
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FICL_VM *bf_vm;
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FICL_WORD *pInterp;
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/*
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* Shim for taking commands from BF and passing them out to 'standard'
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@ -125,17 +126,7 @@ bf_command(FICL_VM *vm)
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if (!parse(&argc, &argv, line)) {
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result = (cmd)(argc, argv);
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free(argv);
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/* ** Let's deal with it elsewhere **
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if(result != 0) {
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vmTextOut(vm,argv[0],0);
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vmTextOut(vm,": ",0);
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vmTextOut(vm,command_errmsg,1);
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}
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*/
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} else {
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/* ** Let's deal with it elsewhere **
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vmTextOut(vm, "parse error\n", 1);
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*/
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result=BF_PARSE;
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}
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free(line);
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@ -152,18 +143,18 @@ bf_command(FICL_VM *vm)
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* being interpreted.
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*
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* There is one major problem with builtins that cannot be overcome
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* in anyway, except by outlawing it, such as done below. We want
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* builtins to behave differently depending on whether they have been
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* compiled or they are being interpreted. Notice that this is *not*
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* the current state. For example:
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* in anyway, except by outlawing it. We want builtins to behave
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* differently depending on whether they have been compiled or they
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* are being interpreted. Notice that this is *not* the interpreter's
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* current state. For example:
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*
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* : example ls ; immediate
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* : problem example ;
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* example
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* : problem example ; \ "ls" gets executed while compiling
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* example \ "ls" gets executed while interpreting
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*
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* Notice that the current state is different in the two invocations
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* of "example", but, in both cases, "ls" has been *compiled in*, which
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* is what we really want.
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* Notice that, though the current state is different in the two
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* invocations of "example", in both cases "ls" has been
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* *compiled in*, which is what we really want.
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*
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* The problem arises when you tick the builtin. For example:
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*
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@ -174,16 +165,37 @@ bf_command(FICL_VM *vm)
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*
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* We have no way, when we get EXECUTEd, of knowing what our behavior
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* should be. Thus, our only alternative is to "outlaw" this. See RFI
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* 0007, and ANS Forth Standard's appendix D, item 6.7.
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* 0007, and ANS Forth Standard's appendix D, item 6.7 for a related
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* problem, concerning compile semantics.
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*
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* The problem is compounded by the fact that ' builtin CATCH is valid
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* The problem is compounded by the fact that "' builtin CATCH" is valid
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* and desirable. The only solution is to create an intermediary word.
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* For example:
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*
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* : my-ls ls ;
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* : example ['] my-ls catch ;
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*
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* As the this definition is particularly tricky, and it's side effects
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* So, with the below implementation, here is a summary of the behavior
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* of builtins:
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*
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* ls -l \ "interpret" behavior, ie,
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* \ takes parameters from TIB
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* : ex-1 s" -l" 1 ls ; \ "compile" behavior, ie,
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* \ takes parameters from the stack
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* : ex-2 ['] ls catch ; immediate \ undefined behavior
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* : ex-3 ['] ls catch ; \ undefined behavior
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* ex-2 ex-3 \ "interpret" behavior,
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* \ catch works
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* : ex-4 ex-2 ; \ "compile" behavior,
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* \ catch does not work
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* : ex-5 ex-3 ; immediate \ same as ex-2
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* : ex-6 ex-3 ; \ same as ex-3
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* : ex-7 ['] ex-1 catch ; \ "compile" behavior,
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* \ catch works
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* : ex-8 postpone ls ; immediate \ same as ex-2
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* : ex-9 postpone ls ; \ same as ex-3
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*
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* As the definition below is particularly tricky, and it's side effects
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* must be well understood by those playing with it, I'll be heavy on
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* the comments.
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*
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@ -243,17 +255,27 @@ bf_init(void)
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(void)ficlExecFD(bf_vm, fd);
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close(fd);
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}
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/* Do this last, so /boot/boot.4th can change it */
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pInterp = ficlLookup("interpret");
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}
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/*
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* Feed a line of user input to the Forth interpreter
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*/
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void
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int
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bf_run(char *line)
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{
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int result;
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CELL id;
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id = bf_vm->sourceID;
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bf_vm->sourceID.i = -1;
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vmPushIP(bf_vm, &pInterp);
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result = ficlExec(bf_vm, line, -1);
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vmPopIP(bf_vm);
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bf_vm->sourceID = id;
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DEBUG("ficlExec '%s' = %d", line, result);
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switch (result) {
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case VM_OUTOFTEXT:
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@ -278,4 +300,6 @@ bf_run(char *line)
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if (result == VM_USEREXIT)
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panic("interpreter exit");
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setenv("interpret", bf_vm->state ? "" : "ok", 1);
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return result;
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}
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