#include <stdlib.h>
#include <assert.h>
#include "regalloc.h"


struct allocation* regalloc(const struct ir *ir) {
	int maxreg = 0;
	for (int i = 0; i < ir->len; i++) {
		const struct irins *ins = ir->inss[i];

		bool haveref[3];
		irins_which_refs(ins, haveref);
		for (int ri = 0; ri < 3; ri++) {
			if (haveref[ri] && ins->three_refs[ri].reg > maxreg) {
				maxreg = ins->three_refs[ri].reg;
			}
		}
	}

	struct allocation *alloc = malloc(sizeof(struct allocation));
	alloc->numregs = maxreg + 1;
	alloc->allocs = malloc(alloc->numregs * sizeof(struct allocation_record));
	for (int i = 0; i < alloc->numregs; i++) {
		alloc->allocs[i].spill = true;  // lel
	}

	return alloc;
}

void allocation_delete(struct allocation *alloc) {
	free(alloc->allocs);
	free(alloc);
}