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forth
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Ondřej Hruška 3 years ago
parent c225928b54
commit 15848e203b
Signed by: MightyPork
GPG Key ID: 2C5FD5035250423D
4 changed files with 108 additions and 52 deletions
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  1. 0
      a.forth
  2. 2
      hello.forth
  3. 158
      main.c
  4. 0
      str.forth

0
a.f → a.forth
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2
hello.forth
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@ -0,0 +1,2 @@
: hi ." Hello, World!" ;
hi

158
main.c
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@ -4,11 +4,12 @@
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#define CONTROL_STACK_DEPTH 1024
#define DATA_STACK_DEPTH 1024
#define RETURN_STACK_DEPTH 1024
#define MAX_NAME_LEN 64
#define MAX_NAME_LEN 32
#define DICT_SIZE 1024
#define COMPILED_BUFFER_SIZE (1024*1024)
#define HEAP_SIZE (1024*1024)
@ -18,27 +19,38 @@ struct fh_thread_s;
struct fh_word_s;
struct fh_instruction_s;
/** Forth runtime global state */
struct fh_global_s {
/** Verbose logging enabled */
bool verbose;
/** Interactive mode (i.e. not started with a file argument) */
bool interactive;
} fh_globals = {};
/* if the return address is this, we should drop back to interactive mode */
#define MAGICADDR_INTERACTIVE 0xFFFFFFFFULL
#define ALIGNWORD(var) \
do { \
while (((var) % 4) != 0) { (var)++; } \
} while (0)
/** Get a value rounded up to multiple of word size */
#define WORDALIGNED(var) (((var) + 3) & ~3)
_Static_assert(WORDALIGNED(0) == 0, "word align");
_Static_assert(WORDALIGNED(1) == 4, "word align");
_Static_assert(WORDALIGNED(2) == 4, "word align");
_Static_assert(WORDALIGNED(3) == 4, "word align");
_Static_assert(WORDALIGNED(4) == 4, "word align");
_Static_assert(WORDALIGNED(5) == 8, "word align");
_Static_assert(WORDALIGNED(1023) == 1024, "word align");
_Static_assert(WORDALIGNED(1024) == 1024, "word align");
/* logging, TODO make levels configurable */
/* logging */
#define LOG(format, ...) do { if(fh_globals.verbose) { fprintf(stderr, format "\r\n", ##__VA_ARGS__); } } while (0)
#define LOGI(format, ...) fprintf(stderr, "\x1b[32m" format "\x1b[m\r\n", ##__VA_ARGS__)
#define LOGE(format, ...) fprintf(stderr, "\x1b[31;1m" format "\x1b[m\r\n", ##__VA_ARGS__)
/* Forth standard output. XXX should be stdout, but then colors get mangled */
/* Forth standard output. XXX should be stdout, but then colors get mangled if logging is used */
#define FHPRINT(format, ...) fprintf(stderr, "\x1b[33;1m" format "\x1b[m", ##__VA_ARGS__)
#define FHPRINT_SVC(format, ...) fprintf(stderr, "" format "", ##__VA_ARGS__)
/** Error codes */
enum fh_error {
FH_OK = 0,
FH_ERR_CS_OVERFLOW,
@ -57,6 +69,7 @@ enum fh_error {
FH_ERR_MAX,
};
/** Error names */
static const char *errornames[] = {
[FH_OK] = "OK",
[FH_ERR_CS_OVERFLOW] = "CS_OVERFLOW",
@ -74,6 +87,7 @@ static const char *errornames[] = {
[FH_ERR_UNKNOWN_WORD] = "UNKNOWN_WORD",
};
/** Get error name from code, returns Unknown if not defined */
const char *fherr_name(enum fh_error e)
{
if (e >= FH_ERR_MAX) {
@ -82,39 +96,59 @@ const char *fherr_name(enum fh_error e)
return errornames[e];
}
/** Word handler typedef */
typedef enum fh_error (*word_exec_t)(struct fh_thread_s *fh);
/** Word struct as they are stored in the dictionary */
struct fh_word_s {
/** Word name */
char name[MAX_NAME_LEN];
/**
* Handler function.
* Builtin functions use pre-defined native handlers.
* User words use a shared handler that executes compiled
* bytecode at 'start' address of the compile-memory area.
*/
word_exec_t handler;
/** Indicates that this is a built-in instruction and not a word call */
bool builtin;
/** Indicates that this instruction should always be treated as interpreted,
* in practice this is only used for `;` */
bool immediate;
/** Start address in case of user words */
uint32_t start;
uint32_t end;
};
/** Bytecode instruction type marker */
enum fb_instruction_kind {
/* Data is a word number in the dict */
/* Data = word pointer (dict index) */
FH_INSTR_WORD,
/* Data is a numeric value to push on the data stack */
/* Data = numeric value to push onto the data stack */
FH_INSTR_NUMBER,
};
/** One instruction in bytecode */
struct fh_instruction_s {
/** What is the meaning of data? */
enum fb_instruction_kind kind;
/** Data word */
uint32_t data;
};
/** words that are not in the dict, have special effect */
/** Bytecode word indices that are not in the dict, have special effect */
enum compiler_word {
/** End of a user defined word, pop address and jump back */
CPLWORD_ENDWORD = DICT_SIZE + 1,
/** This is the `s"` instruction, the length (u32) and string data immediately follow */
CPLWORD_ALLOCSTR,
/** This is the `."` instruction, same format as above. */
CPLWORD_TYPESTR,
};
_Static_assert(sizeof(struct fh_instruction_s) % 4 == 0, "Instruction struct is aligned");
/** Forth runtime major state */
enum fh_state {
FH_STATE_INTERPRET = 0,
FH_STATE_COMPILE,
@ -122,12 +156,14 @@ enum fh_state {
FH_STATE_MAX,
};
/** State names */
static const char *statenames[] = {
[FH_STATE_INTERPRET] = "INTERPRET",
[FH_STATE_COMPILE] = "COMPILE",
[FH_STATE_SHUTDOWN] = "SHUTDOWN",
};
/** Forth runtime minor state */
enum fh_substate {
FH_SUBSTATE_NONE = 0,
FH_SUBSTATE_COLONNAME,
@ -138,6 +174,7 @@ enum fh_substate {
FH_SUBSTATE_MAX,
};
/** Sub-state names */
static const char *substatenames[] = {
[FH_SUBSTATE_NONE] = "NONE",
[FH_SUBSTATE_COLONNAME] = "COLONNAME",
@ -147,6 +184,12 @@ static const char *substatenames[] = {
[FH_SUBSTATE_LINECOMMENT] = "LINECOMMENT",
};
/**
* Forth runtime instance - state variables and memory areas.
*
* Some memory areas, such as the dict or heap, could be moved
* to a shared pointer if multi-threading and synchronization is added.
*/
struct fh_thread_s {
/** Control stack */
uint32_t control_stack[CONTROL_STACK_DEPTH];
@ -176,8 +219,10 @@ struct fh_thread_s {
/** Forth state */
enum fh_state state;
/** Forth sub-state */
enum fh_substate substate;
/** Word currently being executed - a pointer is placed here
* before calling the handler */
struct fh_word_s *exec_word;
@ -188,11 +233,6 @@ struct fh_thread_s {
if (FH_OK != (rv = (x))) return rv; \
} while (0)
#define TRY_FAIL(x) \
do { \
if (FH_OK != (rv = (x))) goto fail; \
} while (0)
/** Add a word to the dictionary. */
enum fh_error fh_add_word(const struct fh_word_s *w, struct fh_thread_s *fh)
{
@ -203,8 +243,7 @@ enum fh_error fh_add_word(const struct fh_word_s *w, struct fh_thread_s *fh)
return FH_OK;
}
//region Push & Pop
/** Pop from data stack */
static inline enum fh_error ds_pop(struct fh_thread_s *fh, uint32_t *out)
{
if (fh->data_stack_top == 0) {
@ -216,6 +255,7 @@ static inline enum fh_error ds_pop(struct fh_thread_s *fh, uint32_t *out)
return FH_OK;
}
/** Pop from return stack */
static inline enum fh_error rs_pop(struct fh_thread_s *fh, uint32_t *out)
{
if (fh->return_stack_top == 0) {
@ -227,6 +267,7 @@ static inline enum fh_error rs_pop(struct fh_thread_s *fh, uint32_t *out)
return FH_OK;
}
/** Pop from control stack */
static inline enum fh_error cs_pop(struct fh_thread_s *fh, uint32_t *out)
{
if (fh->control_stack_top == 0) {
@ -238,6 +279,7 @@ static inline enum fh_error cs_pop(struct fh_thread_s *fh, uint32_t *out)
return FH_OK;
}
/** Push to data stack */
static inline enum fh_error ds_push(struct fh_thread_s *fh, uint32_t in)
{
LOG("DS push %d", in);
@ -248,6 +290,7 @@ static inline enum fh_error ds_push(struct fh_thread_s *fh, uint32_t in)
return FH_OK;
}
/** Push to return stack */
static inline enum fh_error rs_push(struct fh_thread_s *fh, uint32_t in)
{
LOG("RS push %d", in);
@ -258,6 +301,7 @@ static inline enum fh_error rs_push(struct fh_thread_s *fh, uint32_t in)
return FH_OK;
}
/** Push to control stack */
static inline enum fh_error cs_push(struct fh_thread_s *fh, uint32_t in)
{
LOG("CS push %d", in);
@ -268,16 +312,17 @@ static inline enum fh_error cs_push(struct fh_thread_s *fh, uint32_t in)
return FH_OK;
}
//endregion Push & Pop
static void showstate(const struct fh_thread_s *fh) {
if(fh->substate==0) {
/** Log current runtime state */
static void showstate(const struct fh_thread_s *fh)
{
if (fh->substate == 0) {
LOG("state = %s", statenames[fh->state]);
} else {
LOG("state = %s.%s", statenames[fh->state], substatenames[fh->substate]);
}
}
/** Set runtime state and sub-state */
void fh_setstate(struct fh_thread_s *fh, enum fh_state state, enum fh_substate substate)
{
fh->state = state;
@ -285,20 +330,21 @@ void fh_setstate(struct fh_thread_s *fh, enum fh_state state, enum fh_substate s
showstate(fh);
}
/** Set runtime sub-state (state is unchanged) */
void fh_setsubstate(struct fh_thread_s *fh, enum fh_substate substate)
{
fh->substate = substate;
showstate(fh);
}
enum fh_error fh_allot(
/** Allocate a heap region, e.g. for a string. The address is stored to `addr` */
enum fh_error fh_heap_reserve(
struct fh_thread_s *fh,
size_t len,
uint32_t *addr
)
{
uint32_t p = fh->heap_top;
ALIGNWORD(p);
uint32_t p = WORDALIGNED(fh->heap_top); // FIXME this shouldn't be needed
if (p + len > HEAP_SIZE) {
return FH_ERR_HEAP_FULL;
@ -306,22 +352,19 @@ enum fh_error fh_allot(
*addr = p;
size_t next = p + len;
ALIGNWORD(next);
fh->heap_top = next;
fh->heap_top = WORDALIGNED(p + len);
return FH_OK;
}
/** Reserve space in the compile memory area */
enum fh_error fh_compile_reserve(
struct fh_thread_s *fh,
size_t len,
uint32_t *addr
)
{
uint32_t p = fh->compile_top;
// align up
ALIGNWORD(p);
uint32_t p = WORDALIGNED(fh->compile_top); // FIXME this shouldn't be needed
if (p + len > COMPILED_BUFFER_SIZE) {
return FH_ERR_HEAP_FULL;
@ -329,16 +372,11 @@ enum fh_error fh_compile_reserve(
*addr = p;
size_t next = p + len;
ALIGNWORD(next);
fh->compile_top = next;
fh->compile_top = WORDALIGNED(p + len);
return FH_OK;
}
//region Builtin Words
enum fh_error w_add(struct fh_thread_s *fh)
{
enum fh_error rv;
@ -387,7 +425,7 @@ enum fh_error w_user_word(struct fh_thread_s *fh)
instr:;
// make sure it's aligned
ALIGNWORD(fh->execptr);
fh->execptr = WORDALIGNED(fh->execptr);
const struct fh_instruction_s *instr = (const struct fh_instruction_s *) &fh->compile[fh->execptr];
fh->execptr += sizeof(struct fh_instruction_s);
@ -406,7 +444,7 @@ enum fh_error w_user_word(struct fh_thread_s *fh)
strl = *((uint32_t *) &fh->compile[fh->execptr]);
fh->execptr += 4;
if (wn == CPLWORD_ALLOCSTR) {
TRY(fh_allot(fh, strl, &addr));
TRY(fh_heap_reserve(fh, strl, &addr));
memcpy(&fh->heap[addr], &fh->compile[fh->execptr], strl);
LOG("Exec: alloc-str \"%.*s\"", strl, &fh->heap[addr]);
TRY(ds_push(fh, addr));
@ -477,7 +515,6 @@ enum fh_error w_semicolon(struct fh_thread_s *fh)
/* Return to interpret state */
fh_setstate(fh, FH_STATE_INTERPRET, 0);
fh->dict[fh->dict_top].end = fh->compile_top; /* one past the end cell */
fh->dict_top++;
return FH_OK;
}
@ -505,12 +542,14 @@ enum fh_error w_type(struct fh_thread_s *fh)
enum fh_error w_cr(struct fh_thread_s *fh)
{
(void) fh;
FHPRINT("\r\n");
return FH_OK;
}
enum fh_error w_space(struct fh_thread_s *fh)
{
(void) fh;
FHPRINT(" ");
return FH_OK;
}
@ -546,6 +585,7 @@ enum fh_error w_bye(struct fh_thread_s *fh)
return FH_OK;
}
/** Add pointers to built-in word handlers to a runtime struct */
enum fh_error register_builtin_words(struct fh_thread_s *fh)
{
struct name_and_handler {
@ -575,6 +615,7 @@ enum fh_error register_builtin_words(struct fh_thread_s *fh)
{ /* end marker */ }
};
// foreach
struct fh_word_s w;
const struct name_and_handler *p = builtins;
enum fh_error rv;
@ -594,8 +635,7 @@ enum fh_error register_builtin_words(struct fh_thread_s *fh)
#undef ADDWORD
//endregion Builtin Words
/** Initialize a runtime */
enum fh_error fh_init_thread(struct fh_thread_s *fh)
{
enum fh_error rv;
@ -609,7 +649,8 @@ enum fh_error fh_init_thread(struct fh_thread_s *fh)
return FH_OK;
}
enum fh_error fh_handle_quoted_string(
/** Process a quoted string read from input */
static enum fh_error fh_handle_quoted_string(
struct fh_thread_s *fh,
char *start,
size_t len
@ -623,7 +664,7 @@ enum fh_error fh_handle_quoted_string(
if (fh->state == FH_STATE_INTERPRET) {
switch (fh->substate) {
case FH_SUBSTATE_SQUOTE:
TRY(fh_allot(fh, len, &addr));
TRY(fh_heap_reserve(fh, len, &addr));
memcpy(&fh->heap[addr], start, len);
TRY(ds_push(fh, addr));
TRY(ds_push(fh, len));
@ -653,7 +694,8 @@ enum fh_error fh_handle_quoted_string(
return FH_OK;
}
enum fh_error fh_handle_word(
/** Process a word read from input */
static enum fh_error fh_handle_word(
struct fh_thread_s *fh,
char *start,
size_t len
@ -700,37 +742,42 @@ enum fh_error fh_handle_word(
}
if (fh->state == FH_STATE_COMPILE) {
LOG("Compile number: %d", v);
LOG("Compile number: %ld", v);
TRY(fh_compile_reserve(fh, sizeof(struct fh_instruction_s), &addr));
instr.kind = FH_INSTR_NUMBER;
instr.data = (uint32_t) v;
memcpy(&fh->compile[addr], &instr, sizeof(struct fh_instruction_s));
} else {
/* interpret */
LOG("Interpret number: %d", v);
LOG("Interpret number: %ld", v);
TRY(ds_push(fh, (uint32_t) v));
}
return FH_OK;
}
/** True if the character is whitespace */
static inline bool iswhite(char c)
{
return c == ' ' || c == '\n' || c == '\t' || c == '\r';
}
/** True if the character is CR or LF */
static inline bool isnl(char c)
{
return c == '\n' || c == '\r';
}
enum fh_error fh_process_line(struct fh_thread_s *fh, char *linebuf)
/** Process a line read from input */
static enum fh_error fh_process_line(struct fh_thread_s *fh, char *linebuf)
{
enum fh_error rv;
char *rp = linebuf;
char c;
LOGI("%s", linebuf);
if (!fh_globals.interactive) {
LOGI("%s", linebuf);
}
while (0 != (c = *rp) && fh->state != FH_STATE_SHUTDOWN) {
/* end on newline */
@ -806,6 +853,9 @@ enum fh_error fh_process_line(struct fh_thread_s *fh, char *linebuf)
case FH_SUBSTATE_LINECOMMENT:
LOG("Discard line comment");
goto done; // just discard the rest
default:
LOGE("Bad substate %s", substatenames[fh->substate]);
}
}
done:
@ -825,7 +875,7 @@ int main(int argc, char *argv[])
}
fh_globals.verbose = false;
fh_globals.interactive = false;
fh_globals.interactive = isatty(STDIN_FILENO);
FILE *infile = stdin;
@ -835,7 +885,7 @@ int main(int argc, char *argv[])
// opt
char *cc = argv[a] + 1;
char c;
while(0 != (c = *cc++)) {
while (0 != (c = *cc++)) {
switch (c) {
case 'v':
fh_globals.verbose = 1;
@ -876,7 +926,11 @@ int main(int argc, char *argv[])
FHPRINT_SVC(" ok\r\n");
} else {
LOGE("ERROR %s on line %d", fherr_name(rv), linecnt);
return 1;
if (!fh_globals.interactive) {
return 1;
}
/* reset state */
fh_setstate(&fh, FH_STATE_INTERPRET, FH_SUBSTATE_NONE);
}
}

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