#include "factor.h" void reset_datastack(void) { env.ds = env.ds_bot; env.dt = empty; } void reset_callstack(void) { env.cs = env.cs_bot; cpush(empty); } void init_stacks(void) { env.ds_bot = (CELL)alloc_guarded(STACK_SIZE); reset_datastack(); env.cs_bot = (CELL)alloc_guarded(STACK_SIZE); reset_callstack(); env.cf = env.boot; } void primitive_drop(void) { check_non_empty(env.dt); env.dt = dpop(); } void primitive_dup(void) { check_non_empty(env.dt); dpush(env.dt); } void primitive_swap(void) { CELL top, next; check_non_empty(env.dt); check_non_empty(dpeek()); top = env.dt; next = dpop(); dpush(top); env.dt = next; } void primitive_over(void) { CELL under = dpeek(); check_non_empty(env.dt); check_non_empty(under); dpush(env.dt); env.dt = under; } void primitive_pick(void) { CELL under = dpeek(); CELL under_under = get(env.ds - CELLS * 2); check_non_empty(env.dt); check_non_empty(under); check_non_empty(under_under); dpush(env.dt); env.dt = under_under; } void primitive_nip(void) { check_non_empty(dpeek()); dpop(); } void primitive_tuck(void) { CELL under = dpeek(); check_non_empty(env.dt); check_non_empty(under); dpop(); dpush(env.dt); dpush(under); } void primitive_rot(void) { CELL y, z; /* z y env.dt --> y env.dt z */ check_non_empty(env.dt); y = dpeek(); check_non_empty(y); z = get(env.ds - CELLS * 2); check_non_empty(z); put(env.ds - CELLS * 2,y); put(env.ds - CELLS,env.dt); env.dt = z; } void primitive_to_r(void) { check_non_empty(env.dt); cpush(env.dt); env.dt = dpop(); } void primitive_from_r(void) { check_non_empty(cpeek()); dpush(env.dt); env.dt = cpop(); } VECTOR* stack_to_vector(CELL bottom, CELL top) { CELL depth = (top - bottom) / CELLS - 1; VECTOR* v = vector(depth); ARRAY* a = v->array; memcpy(a + 1,(char*)bottom + CELLS,depth * CELLS); v->top = depth; return v; } void primitive_datastack(void) { dpush(env.dt); env.dt = tag_object(stack_to_vector(env.ds_bot,env.ds)); } void primitive_callstack(void) { dpush(env.dt); env.dt = tag_object(stack_to_vector(env.cs_bot,env.cs)); } /* Returns top of stack */ CELL vector_to_stack(VECTOR* vector, CELL bottom) { CELL start = bottom + CELLS; CELL len = vector->top * CELLS; memcpy((void*)start,vector->array + 1,len); return start + len; } void primitive_set_datastack(void) { env.ds = vector_to_stack(untag_vector(env.dt),env.ds_bot); env.dt = dpop(); } void primitive_set_callstack(void) { env.cs = vector_to_stack(untag_vector(env.dt),env.cs_bot); env.dt = dpop(); }