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417 lines
11 KiB
417 lines
11 KiB
#include "forth_internal.h"
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struct fh_global_s fh_globals = {};
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/** State names */
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static const char *statenames[FH_STATE_MAX] = {
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[FH_STATE_INTERPRET] = "INTERPRET",
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[FH_STATE_COMPILE] = "COMPILE",
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[FH_STATE_QUIT] = "QUIT",
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[FH_STATE_SHUTDOWN] = "SHUTDOWN",
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};
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/** State names short */
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static const char *stateshort[FH_STATE_MAX] = {
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[FH_STATE_INTERPRET] = "INT",
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[FH_STATE_COMPILE] = "COM",
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[FH_STATE_QUIT] = "QIT",
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[FH_STATE_SHUTDOWN] = "DIE",
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};
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/** Sub-state names */
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const char *substatenames[FH_SUBSTATE_MAX] = {
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[FH_SUBSTATE_NONE] = "NONE",
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[FH_SUBSTATE_PAREN_COMMENT] = "PAREN_COMMENT",
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[FH_SUBSTATE_LINE_COMMENT] = "LINE_COMMENT",
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[FH_SUBSTATE_EXIT] = "EXIT",
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[FH_SUBSTATE_SKIP_IF] = "SKIP_IF",
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};
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/** Sub-state names */
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static const char *instrnames[FH_INSTR_MAX] = {
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[FH_INSTR_WORD] = "WORD",
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[FH_INSTR_NUMBER] = "NUMBER",
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[FH_INSTR_ENDWORD] = "ENDWORD",
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[FH_INSTR_ALLOCSTR] = "ALLOCSTR",
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[FH_INSTR_TYPESTR] = "TYPESTR",
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[FH_INSTR_JUMP] = "JUMP",
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[FH_INSTR_JUMPZERO] = "JUMPZERO",
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[FH_INSTR_LEAVE] = "LEAVE",
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[FH_INSTR_DO] = "DO",
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[FH_INSTR_TO] = "TO",
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[FH_INSTR_DO_QUESTION] = "DO_QUESTION",
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[FH_INSTR_LOOP] = "LOOP",
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[FH_INSTR_LOOP_PLUS] = "LOOP_PLUS",
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[FH_INSTR_POSTPONED_WORD] = "POSTPONED_WORD",
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};
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const char *instr_name(enum fh_instruction_kind kind) {
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if (kind >= FH_INSTR_MAX) {
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return "Unknown";
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} else {
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return instrnames[kind];
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}
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}
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/** Add a word to the dictionary. */
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enum fh_error fh_add_word(const struct fh_word_s *w, struct fh_thread_s *fh)
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{
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enum fh_error rv;
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fh_align(fh);
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uint32_t ptr = fh->here;
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TRY(fh_heap_put(fh, w, DICTWORD_SIZE));
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//LOG("Added word \"%s\" at 0x%08x", w->name, ptr);
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// thread it onto the linked list
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struct fh_word_s *word = fh_word_at(fh, ptr);
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if (!word) return FH_ERR_INTERNAL;
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word->previous = fh->dict_last;
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fh->dict_last = ptr;
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return FH_OK;
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}
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/** Log current runtime state */
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static void showstate(const struct fh_thread_s *fh)
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{
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if (fh->substate == 0) {
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LOG("state -> %s", statenames[fh->state]);
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} else {
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LOG("state -> %s.%s", statenames[fh->state], substatenames[fh->substate]);
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}
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}
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/** Set runtime state and sub-state */
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void fh_setstate(struct fh_thread_s *fh, enum fh_state state, enum fh_substate substate)
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{
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fh->state = state;
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fh->substate = substate;
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showstate(fh);
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}
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/** Set runtime sub-state (state is unchanged) */
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void fh_setsubstate(struct fh_thread_s *fh, enum fh_substate substate)
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{
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fh->substate = substate;
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showstate(fh);
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}
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/** Execute a user word */
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enum fh_error w_user_word(struct fh_thread_s *fh, const struct fh_word_s *w0)
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{
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enum fh_error rv;
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const struct fh_word_s *w;
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struct fh_word_s *w2;
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w = w0;
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call:
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if (!w) { return FH_ERR_INTERNAL; }
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LOG("Run user word: %s", w->name);
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TRY(rs_push(fh, fh->execptr));
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fh->execptr = w->param;
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instr:;
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if (fh->state == FH_STATE_QUIT) {
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/* abort or quit was called, return to interactive mode */
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fh_setstate(fh, FH_STATE_INTERPRET, FH_SUBSTATE_NONE);
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return FH_OK;
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}
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// make sure it's aligned
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fh->execptr = WORDALIGNED(fh->execptr);
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const struct fh_instruction_s *instr = fh_instr_at(fh, fh->execptr);
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if (!instr) {
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LOGE("Execution pointer out of bounds!");
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return FH_ERR_INTERNAL;
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}
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fh->execptr += INSTR_SIZE;
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uint32_t strl;
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uint32_t val;
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uint32_t addr = 0;
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uint32_t limit, index, index0;
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switch (instr->kind) {
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case FH_INSTR_NUMBER:
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TRY(ds_push(fh, instr->data));
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goto instr;
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case FH_INSTR_POSTPONED_WORD:
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//if (fh->state == FH_STATE_COMPILE) {
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w2 = fh_word_at(fh, instr->data);
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if (!w2) {
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LOGE("Postponed bad word addr!");
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return FH_ERR_INTERNAL;
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}
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if (w2->flags & WORDFLAG_IMMEDIATE) {
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LOG("Call immediate postponed word: %s", w2->name);
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TRY(w2->handler(fh, w2));
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} else {
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LOG("Add postponed word: %s", w2->name);
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TRY(fh_put_instr(fh, FH_INSTR_WORD, instr->data));
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}
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/*} else {
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LOGE("Postpone in interpret mode!");
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goto end;
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}*/
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goto instr;
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case FH_INSTR_WORD:
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w2 = fh_word_at(fh, instr->data);
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if (!w2) {
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LOGE("Instr bad word addr!");
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return FH_ERR_INTERNAL;
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}
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if (w2->flags & WORDFLAG_BUILTIN) {
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LOG("Exec: native-word \"%s\"", w2->name);
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TRY(w2->handler(fh, w2));
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if (fh->substate == FH_SUBSTATE_EXIT) {
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fh_setsubstate(fh, 0);
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LOG("Exec: early return");
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TRY(rs_pop(fh, &fh->execptr));
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if (fh->execptr == MAGICADDR_EXEC_INTERACTIVE) {
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goto end;
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}
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}
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goto instr;
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} else {
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LOG("Exec: user-word %s (CALL)", w2->name);
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w = fh_word_at(fh, instr->data);
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if (!w) {
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LOGE("CALL instr bad word addr!");
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return FH_ERR_INTERNAL;
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}
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goto call;
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}
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case FH_INSTR_JUMPZERO:
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if (instr->data == MAGICADDR_UNRESOLVED) {
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LOGE("Encountered unresolved jump!");
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goto end;
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}
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TRY(ds_pop(fh, &val));
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if (0 == val) {
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fh->execptr = instr->data;
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}
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goto instr;
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case FH_INSTR_JUMP:
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if (instr->data == MAGICADDR_UNRESOLVED) {
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LOGE("Encountered unresolved jump!");
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goto end;
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}
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fh->execptr = instr->data;
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goto instr;
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case FH_INSTR_TO:
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TRY(ds_pop(fh, &val));
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w2 = fh_word_at(fh, instr->data);
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if (!w2) {
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LOGE("TO instr bad variable addr!");
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return FH_ERR_INTERNAL;
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}
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LOG("Exec: %d->%s", val, w2->name);
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if (w2->flags & WORDFLAG_CONSTANT) {
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LOGE("Cannot assign to constant!");
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return FH_ERR_ILLEGAL_STORE;
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}
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w2->param = val;
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goto instr;
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case FH_INSTR_DO:
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TRY(ds_pop(fh, &index));
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TRY(ds_pop(fh, &limit)); // just make sure it exists
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TRY(fh_loop_nest(fh, index));
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TRY(rs_push(fh, limit));
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goto instr;
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case FH_INSTR_DO_QUESTION:
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if (instr->data == MAGICADDR_UNRESOLVED) {
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LOGE("Encountered unresolved jump!");
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goto end;
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}
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TRY(ds_pop(fh, &index));
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TRY(ds_pop(fh, &limit));
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if (index == limit) {
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// jump to end
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fh->execptr = instr->data;
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} else {
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TRY(fh_loop_nest(fh, index));
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TRY(rs_push(fh, limit));
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}
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goto instr;
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case FH_INSTR_LOOP_PLUS:
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TRY(ds_pop(fh, &val));
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// fall-through
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case FH_INSTR_LOOP:
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if (instr->kind == FH_INSTR_LOOP) {
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val = 1;
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}
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// R: index,limit
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TRY(rs_peek(fh, &limit));
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LOG("+LOOP, i=%d, step %d, limit %d", fh->loop_i, val, limit);
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index0 = fh->loop_i;
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fh->loop_i += val;
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LOG("after add: %d", fh->loop_i);
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// FIXME this is probably wrong
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if (((int32_t)index0 < (int32_t)limit) == ((int32_t)fh->loop_i < (int32_t)limit) && fh->loop_i != limit) { // boundary not crossed, continue
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fh->execptr = instr->data; // go to beginning
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} else {
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// end of loop
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TRY(rs_pop(fh, &limit));
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TRY(fh_loop_unnest(fh));
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}
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goto instr;
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case FH_INSTR_LEAVE:
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if (instr->data == MAGICADDR_UNRESOLVED) {
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LOGE("Encountered unresolved jump!");
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goto end;
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}
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TRY(rs_pop(fh, &limit));
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TRY(fh_loop_unnest(fh));
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fh->execptr = instr->data;
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goto instr;
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/* special case for strings stored in compile memory */
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case FH_INSTR_ALLOCSTR:
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case FH_INSTR_TYPESTR:
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strl = instr->data;
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if (instr->kind == FH_INSTR_ALLOCSTR) {
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LOG("Exec: alloc-str \"%.*s\"", strl, fh_str_at(fh, fh->execptr));
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TRY(ds_push(fh, fh->execptr)); // give pointer directly into the definition
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TRY(ds_push(fh, strl));
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} else {
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LOG("Exec: type-str \"%.*s\"", strl, fh_str_at(fh, fh->execptr));
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FHPRINT("%.*s", (int) strl, fh_str_at(fh, fh->execptr));
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}
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fh->execptr += strl;
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goto instr;
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case FH_INSTR_ENDWORD:
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LOG("Exec: word-end");
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TRY(rs_pop(fh, &fh->execptr));
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if (fh->execptr == MAGICADDR_EXEC_INTERACTIVE) {
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goto end;
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}
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goto instr;
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}
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end:
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return FH_OK;
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}
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/** Initialize a runtime */
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enum fh_error fh_init(struct fh_thread_s *fh)
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{
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enum fh_error rv;
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/* Make sure we have a clean state */
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memset(fh, 0, sizeof(struct fh_thread_s));
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fh->dict_last = MAGICADDR_DICTFIRST;
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TRY(register_builtin_words(fh));
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fh->execptr = MAGICADDR_EXEC_INTERACTIVE;
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fh->base = 10;
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return FH_OK;
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}
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enum fh_error fh_handle_word(struct fh_thread_s *fh, uint32_t addr)
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{
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enum fh_error rv;
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struct fh_word_s *w = fh_word_at(fh, addr);
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if (!w) return FH_ERR_INTERNAL;
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if (fh->state == FH_STATE_COMPILE && 0 == (w->flags & WORDFLAG_IMMEDIATE)) {
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LOG("\x1b[34m[%s] Compile word:\x1b[m %s", stateshort[fh->state], w->name);
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TRY(fh_put_instr(fh, FH_INSTR_WORD, addr));
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} else {
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/* interpret or immediate in compiled code */
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// enum fh_state oldstate = fh->state;
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// fh_setstate(fh, FH_STATE_INTERPRET, 0);
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LOG("\x1b[35m[%s] Run word:\x1b[m %s%s", stateshort[fh->state], w->name, (w->flags&WORDFLAG_IMMEDIATE)?" 'imm":"");
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TRY(w->handler(fh, w));
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// if (fh->state == FH_STATE_INTERPRET && fh->substate == FH_SUBSTATE_NONE) {
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// fh_setstate(fh, oldstate, 0);
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// }
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}
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return FH_OK;
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}
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enum fh_error fh_find_word(struct fh_thread_s *fh, const char *name, size_t wordlen, uint32_t *addr_out)
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{
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if (name == NULL) {
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return FH_ERR_UNKNOWN_WORD;
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}
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if (wordlen == 0) {
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wordlen = strlen(name);
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}
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uint32_t addr = fh->dict_last;
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while (addr != MAGICADDR_DICTFIRST) {
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struct fh_word_s *w = fh_word_at(fh, addr);
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if (!w) {
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break;
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}
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if (0 == strncasecmp(name, w->name, wordlen) && w->name[wordlen] == 0) {
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if (addr_out) {
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*addr_out = addr;
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}
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return FH_OK;
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}
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addr = w->previous;
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}
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// no log message, this can be OK - e.g. parsing a number
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//LOG("fail to find word %.*s", wordlen, name);
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return FH_ERR_UNKNOWN_WORD;
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}
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enum fh_error fh_loop_nest(struct fh_thread_s *fh, uint32_t indexvalue)
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{
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enum fh_error rv;
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TRY(rs_push(fh, fh->loop_j));
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fh->loop_j = fh->loop_i;
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fh->loop_i = indexvalue;
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return FH_OK;
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}
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enum fh_error fh_loop_unnest(struct fh_thread_s *fh)
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{
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enum fh_error rv;
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fh->loop_i = fh->loop_j;
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TRY(rs_pop(fh, &fh->loop_j));
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return FH_OK;
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}
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/** Postpone a word */
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enum fh_error fh_postpone_word(
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struct fh_thread_s *fh,
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const char *name,
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const size_t wordlen
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)
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{
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enum fh_error rv;
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uint32_t wadr;
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TRY(fh_find_word(fh, name, wordlen, &wadr));
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LOG("Postpone word");
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TRY(fh_put_instr(fh, FH_INSTR_POSTPONED_WORD, wadr));
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return FH_OK;
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}
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