Start fresh

1 files changed, 0 insertions, 459 deletions

diff --git a/src/reduce.c b/src/reduce.c
deleted file mode 100644
index 44c4d97..0000000
--- a/src/reduce.c
+++ /dev/null
@@ -1,459 +0,0 @@
-// Copyright (c) 2023, Marvin Borner <dev@marvinborner.de>
-// based on the RKNL abstract machine
-
-#include <stdlib.h>
-#include <assert.h>
-#include <stdio.h>
-#include <string.h>
-
-#include <reduce.h>
-#include <murmur3.h>
-#include <store.h>
-#include <term.h>
-#include <gc.h>
-
-struct tracked {
-	void *stuff;
-};
-
-struct stack {
-	void *data;
-	struct stack *next;
-};
-
-struct closure {
-	struct term *term;
-	struct store *store;
-};
-
-struct box {
-	enum { TODO, DONE } state;
-	struct term *term;
-};
-
-struct cache {
-	struct box *box;
-	struct term *term;
-};
-
-struct conf {
-	enum { ECONF, CCONF } type;
-	union {
-		struct { // closure
-			struct term *term;
-			struct store *store;
-			struct stack *stack;
-		} econf; // blue
-
-		struct { // computed
-			struct stack *stack;
-			struct term *term;
-		} cconf; // green
-	} u;
-};
-
-static int name_generator(void)
-{
-	static int current = 0x181202;
-	return current++;
-}
-
-static struct stack *stack_push(struct stack *stack, void *data)
-{
-	struct stack *new = GC_malloc(sizeof(*new));
-	new->data = data;
-	new->next = stack;
-	return new;
-}
-
-static struct stack *stack_next(struct stack *stack)
-{
-	struct stack *next = stack->next;
-	return next;
-}
-
-static void econf(struct conf *conf, struct term *term, struct store *store,
-		  struct stack *stack)
-{
-	conf->type = ECONF;
-	conf->u.econf.term = term;
-	conf->u.econf.store = store;
-	conf->u.econf.stack = stack;
-}
-
-static void cconf(struct conf *conf, struct stack *stack, struct term *term)
-{
-	conf->type = CCONF;
-	conf->u.cconf.stack = stack;
-	conf->u.cconf.term = term;
-}
-
-static int transition_1(struct term **term, struct store **store,
-			struct stack **stack)
-{
-	struct closure *closure = GC_malloc(sizeof(*closure));
-	closure->term = (*term)->u.app.rhs;
-	closure->store = *store;
-
-	struct term *app = new_term(APP);
-	app->u.app.lhs = new_term(VAR);
-	app->u.app.rhs = new_term(CLOSURE);
-	app->u.app.rhs->u.other = closure;
-
-	*term = (*term)->u.app.lhs;
-	*store = *store;
-	*stack = stack_push(*stack, app);
-
-	return 0;
-}
-
-static int transition_2(struct stack **stack, struct term **term,
-			struct store *store)
-{
-	struct box *box = GC_malloc(sizeof(*box));
-	box->state = TODO;
-	box->term = 0;
-
-	struct closure *closure = GC_malloc(sizeof(*closure));
-	closure->term = *term;
-	closure->store = store;
-
-	struct cache *cache = GC_malloc(sizeof(*cache));
-	cache->box = box;
-	cache->term = new_term(CLOSURE);
-	cache->term->u.other = closure;
-
-	*stack = *stack;
-	*term = new_term(CACHE);
-	(*term)->u.other = cache;
-
-	return 0;
-}
-
-static int transition_3(struct term **term, struct store **store,
-			struct stack **stack, struct box *box)
-{
-	assert(box->term->type == CLOSURE);
-
-	struct cache *cache = GC_malloc(sizeof(*cache));
-	cache->box = box;
-	cache->term = new_term(VAR);
-
-	struct term *cache_term = new_term(CACHE);
-	cache_term->u.other = cache;
-
-	struct closure *closure = box->term->u.other;
-	*term = closure->term;
-	*store = closure->store;
-	*stack = stack_push(*stack, cache_term);
-
-	return 0;
-}
-
-static int transition_4(struct stack **stack, struct term **term,
-			struct box *box)
-{
-	*stack = *stack;
-	*term = box->term;
-
-	return 0;
-}
-
-static int transition_5(struct stack **stack, struct term **term,
-			struct term *peek_term)
-{
-	struct cache *cache = peek_term->u.other;
-	struct box *box = cache->box;
-
-	box->state = DONE;
-	box->term = *term;
-
-	*stack = stack_next(*stack);
-	*term = *term;
-
-	return 0;
-}
-
-static int transition_6(struct term **term, struct store **store,
-			struct stack **stack, struct term *peek_term,
-			struct closure *closure)
-{
-	struct box *box = GC_malloc(sizeof(*box));
-	box->state = TODO;
-	box->term = peek_term->u.app.rhs;
-
-	*term = closure->term->u.abs.term;
-	*store = store_set(closure->store, &closure->term->u.abs.name, box, 0);
-	*stack = stack_next(*stack);
-
-	return 0;
-}
-
-static int transition_7(struct term **term, struct store **store,
-			struct stack **stack, struct box *box,
-			struct closure *closure)
-{
-	int x = name_generator();
-
-	struct box *var_box = GC_malloc(sizeof(*var_box));
-	var_box->state = DONE;
-	var_box->term = new_term(VAR);
-	var_box->term->u.var.name = x;
-
-	struct cache *cache = GC_malloc(sizeof(*cache));
-	cache->box = box;
-	cache->term = new_term(VAR);
-
-	struct term *cache_term = new_term(CACHE);
-	cache_term->u.other = cache;
-
-	struct term *abs = new_term(ABS);
-	abs->u.abs.name = x;
-	abs->u.abs.term = new_term(VAR);
-
-	*term = closure->term->u.abs.term;
-	*store = store_set(closure->store, (void *)&closure->term->u.abs.name,
-			   var_box, 0);
-	*stack = stack_push(*stack, cache_term);
-	*stack = stack_push(*stack, abs);
-
-	return 0;
-}
-
-static int transition_8(struct stack **stack, struct term **term,
-			struct box *box)
-{
-	*stack = *stack;
-	*term = box->term;
-
-	return 0;
-}
-
-static int transition_9(struct term **term, struct store **store,
-			struct stack **stack, struct term *peek_term)
-{
-	struct closure *closure = peek_term->u.app.rhs->u.other;
-
-	struct term *app = new_term(APP);
-	app->u.app.lhs = *term;
-	app->u.app.rhs = new_term(VAR);
-
-	*term = closure->term;
-	*store = closure->store;
-	*stack = stack_push(stack_next(*stack), app);
-
-	return 0;
-}
-
-static int transition_10(struct stack **stack, struct term **term,
-			 struct term *peek_term)
-{
-	struct term *app = new_term(APP);
-	app->u.app.lhs = peek_term->u.app.lhs;
-	app->u.app.rhs = *term;
-
-	*stack = stack_next(*stack);
-	*term = app;
-
-	return 0;
-}
-
-static int transition_11(struct stack **stack, struct term **term,
-			 struct term *peek_term)
-{
-	struct term *abs = new_term(ABS);
-	abs->u.abs.name = peek_term->u.abs.name;
-	abs->u.abs.term = *term;
-
-	*stack = stack_next(*stack);
-	*term = abs;
-
-	return 0;
-}
-
-static int transition_closure(struct conf *conf, int i,
-			      void (*callback)(int, char, void *), void *data)
-{
-	struct term *term = conf->u.econf.term;
-	struct store *store = conf->u.econf.store;
-	struct stack *stack = conf->u.econf.stack;
-
-	int ret = 1;
-	switch (term->type) {
-	case APP: // (1)
-		callback(i, '1', data);
-		ret = transition_1(&term, &store, &stack);
-		econf(conf, term, store, stack);
-		return ret;
-	case ABS: // (2)
-		callback(i, '2', data);
-		ret = transition_2(&stack, &term, store);
-		cconf(conf, stack, term);
-		return ret;
-	case VAR:;
-		struct box *box = store_get(store, &term->u.var.name, 0);
-		if (!box) {
-			box = GC_malloc(sizeof(*box));
-			box->state = DONE;
-			box->term = term;
-		}
-		if (box->state == TODO) { // (3)
-			callback(i, '3', data);
-			ret = transition_3(&term, &store, &stack, box);
-			econf(conf, term, store, stack);
-			return ret;
-		} else if (box->state == DONE) { // (4)
-			callback(i, '4', data);
-			ret = transition_4(&stack, &term, box);
-			cconf(conf, stack, term);
-			return ret;
-		}
-		fprintf(stderr, "Invalid box state %d\n", box->state);
-		return 1;
-	default:
-		fprintf(stderr, "Invalid econf type %d\n", term->type);
-		return 1;
-	}
-}
-
-static int transition_computed(struct conf *conf, int i,
-			       void (*callback)(int, char, void *), void *data)
-{
-	struct stack *stack = conf->u.cconf.stack;
-	struct term *term = conf->u.cconf.term;
-	if (!stack) {
-		fprintf(stderr, "Invalid stack!\n");
-		return 1;
-	}
-	int ret = 1;
-	struct term *peek_term = stack->data;
-	if (peek_term && peek_term->type == CACHE) { // (5)
-		struct cache *cache = peek_term->u.other;
-		struct term *cache_term = cache->term;
-		if (cache_term->type == VAR && !cache_term->u.var.name) {
-			callback(i, '5', data);
-			ret = transition_5(&stack, &term, peek_term);
-			cconf(conf, stack, term);
-			return ret;
-		}
-	}
-	if (peek_term && peek_term->type == APP &&
-	    peek_term->u.app.lhs->type == VAR &&
-	    !peek_term->u.app.lhs->u.var.name && term->type == CACHE &&
-	    ((struct cache *)term->u.other)->term->type == CLOSURE) { // (6)
-		struct closure *closure =
-			((struct cache *)term->u.other)->term->u.other;
-		if (closure->term->type == ABS) {
-			callback(i, '6', data);
-			struct store *store;
-			ret = transition_6(&term, &store, &stack, peek_term,
-					   closure);
-			econf(conf, term, store, stack);
-			return ret;
-		}
-	}
-	if (term->type == CACHE &&
-	    ((struct cache *)term->u.other)->term->type == CLOSURE) {
-		struct box *box = ((struct cache *)term->u.other)->box;
-		struct closure *closure =
-			((struct cache *)term->u.other)->term->u.other;
-		if (closure->term->type == ABS && box->state == TODO &&
-		    !box->term) { // (7)
-			callback(i, '7', data);
-			struct store *store;
-			ret = transition_7(&term, &store, &stack, box, closure);
-			econf(conf, term, store, stack);
-			return ret;
-		}
-		if (closure->term->type == ABS && box->state == DONE) { // (8)
-			callback(i, '8', data);
-			ret = transition_8(&stack, &term, box);
-			cconf(conf, stack, term);
-			return ret;
-		}
-	}
-	if (peek_term && peek_term->type == APP &&
-	    peek_term->u.app.lhs->type == VAR &&
-	    !peek_term->u.app.lhs->u.var.name &&
-	    peek_term->u.app.rhs->type == CLOSURE) { // (9)
-		callback(i, '9', data);
-		struct store *store;
-		ret = transition_9(&term, &store, &stack, peek_term);
-		econf(conf, term, store, stack);
-		return ret;
-	}
-	if (peek_term && peek_term->type == APP &&
-	    peek_term->u.app.rhs->type == VAR &&
-	    !peek_term->u.app.rhs->u.var.name) { // (10)
-		callback(i, 'A', data);
-		ret = transition_10(&stack, &term, peek_term);
-		cconf(conf, stack, term);
-		return ret;
-	}
-	if (peek_term && peek_term->type == ABS &&
-	    peek_term->u.abs.term->type == VAR &&
-	    !peek_term->u.abs.term->u.var.name) { // (11)
-		callback(i, 'B', data);
-		ret = transition_11(&stack, &term, peek_term);
-		cconf(conf, stack, term);
-		return ret;
-	}
-	if (!peek_term)
-		return 1;
-
-	// If implemented *correctly* it's proven that this can't happen
-	fprintf(stderr, "Invalid cconf transition state\n");
-	return 1;
-}
-
-static int transition(struct conf *conf, int i,
-		      void (*callback)(int, char, void *), void *data)
-{
-	if (conf->type == ECONF) {
-		return transition_closure(conf, i, callback, data);
-	} else if (conf->type == CCONF) {
-		return transition_computed(conf, i, callback, data);
-	}
-	fprintf(stderr, "Invalid transition state %x\n", conf->type);
-	return 1;
-}
-
-static struct conf *for_each_state(struct conf *conf, int i,
-				   void (*callback)(int, char, void *),
-				   void *data)
-{
-	int ret = 0;
-	while (!ret)
-		ret = transition(conf, i++, callback, data);
-	return conf;
-}
-
-static int hash_var_equal(void *lhs, void *rhs)
-{
-	/* return memcmp(lhs, rhs, sizeof(int)); */
-	return *(int *)lhs == *(int *)rhs;
-}
-
-static uint32_t hash_var(void *key)
-{
-	return murmur3_32((uint8_t *)key, sizeof(int), 0);
-}
-
-struct term *reduce(struct term *term, void (*callback)(int, char, void *),
-		    void *data)
-{
-	struct stack stack = { 0 };
-	struct store *store = store_new(hash_var, hash_var_equal);
-	struct conf conf = {
-		.type = ECONF,
-		.u.econf.term = term,
-		.u.econf.store = store,
-		.u.econf.stack = &stack,
-	};
-	for_each_state(&conf, 0, callback, data);
-	assert(conf.type == CCONF);
-
-	struct term *ret = duplicate_term(conf.u.cconf.term);
-
-	return ret;
-}