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#include "eval.h"
#include "builtin.h"
#include "exc.h"
#include "consts.h"
#include "gc.h"
#include <cstdio>
extern Pair *empty_list;
FrameObj *eval_stack[EVAL_STACK_SIZE];
void Evaluator::add_builtin_routines() {
#define ADD_ENTRY(name, rout) \
envt->add_binding(new SymObj(name), rout)
#define ADD_BUILTIN_PROC(name, rout) \
ADD_ENTRY(name, new BuiltinProcObj(rout, name))
ADD_ENTRY("if", new SpecialOptIf());
ADD_ENTRY("lambda", new SpecialOptLambda());
ADD_ENTRY("define", new SpecialOptDefine());
ADD_ENTRY("set!", new SpecialOptSet());
ADD_ENTRY("quote", new SpecialOptQuote());
ADD_ENTRY("eval", new SpecialOptEval());
ADD_ENTRY("and", new SpecialOptAnd());
ADD_ENTRY("or", new SpecialOptOr());
ADD_ENTRY("apply", new SpecialOptApply());
ADD_ENTRY("delay", new SpecialOptDelay());
ADD_ENTRY("force", new SpecialOptForce());
ADD_BUILTIN_PROC("+", num_add);
ADD_BUILTIN_PROC("-", num_sub);
ADD_BUILTIN_PROC("*", num_mul);
ADD_BUILTIN_PROC("/", num_div);
ADD_BUILTIN_PROC("<", num_lt);
ADD_BUILTIN_PROC("<=", num_le);
ADD_BUILTIN_PROC(">", num_gt);
ADD_BUILTIN_PROC(">=", num_ge);
ADD_BUILTIN_PROC("=", num_eq);
ADD_BUILTIN_PROC("exact?", num_is_exact);
ADD_BUILTIN_PROC("inexact?", num_is_inexact);
ADD_BUILTIN_PROC("number?", is_number);
ADD_BUILTIN_PROC("complex?", is_complex);
ADD_BUILTIN_PROC("real?", is_real);
ADD_BUILTIN_PROC("rational?", is_rational);
ADD_BUILTIN_PROC("integer?", is_integer);
ADD_BUILTIN_PROC("abs", num_abs);
ADD_BUILTIN_PROC("modulo", num_mod);
ADD_BUILTIN_PROC("remainder", num_rem);
ADD_BUILTIN_PROC("quotient", num_quo);
ADD_BUILTIN_PROC("gcd", num_gcd);
ADD_BUILTIN_PROC("lcm", num_lcm);
ADD_BUILTIN_PROC("not", bool_not);
ADD_BUILTIN_PROC("boolean?", is_boolean);
ADD_BUILTIN_PROC("pair?", is_pair);
ADD_BUILTIN_PROC("cons", make_pair);
ADD_BUILTIN_PROC("car", pair_car);
ADD_BUILTIN_PROC("cdr", pair_cdr);
ADD_BUILTIN_PROC("set-car!", pair_set_car);
ADD_BUILTIN_PROC("set-cdr!", pair_set_cdr);
ADD_BUILTIN_PROC("null?", is_null);
ADD_BUILTIN_PROC("list?", is_list);
ADD_BUILTIN_PROC("list", make_list);
ADD_BUILTIN_PROC("length", length);
ADD_BUILTIN_PROC("append", append);
ADD_BUILTIN_PROC("reverse", reverse);
ADD_BUILTIN_PROC("list-tail", list_tail);
ADD_BUILTIN_PROC("eqv?", is_eqv);
ADD_BUILTIN_PROC("eq?", is_eqv);
ADD_BUILTIN_PROC("equal?", is_equal);
ADD_BUILTIN_PROC("display", display);
ADD_BUILTIN_PROC("string?", is_string);
ADD_BUILTIN_PROC("symbol?", is_symbol);
ADD_BUILTIN_PROC("string<?", string_lt);
ADD_BUILTIN_PROC("string<=?", string_le);
ADD_BUILTIN_PROC("string>?", string_gt);
ADD_BUILTIN_PROC("string>=?", string_ge);
ADD_BUILTIN_PROC("string=?", string_eq);
ADD_BUILTIN_PROC("make-vector", make_vector);
ADD_BUILTIN_PROC("vector-set!", vector_set);
ADD_BUILTIN_PROC("vector-ref", vector_ref);
ADD_BUILTIN_PROC("vector-length", vector_length);
}
Evaluator::Evaluator() {
envt = new Environment(NULL); // Top-level Environment
gc.attach(envt);
add_builtin_routines();
}
inline bool make_exec(Pair *ptr) {
if (ptr == empty_list) return true;
EvalObj *nptr;
for (;;)
if ((nptr = ptr->cdr)->is_pair_obj())
{
ptr->next = TO_PAIR(nptr);
ptr = ptr->next;
}
else break;
ptr->next = NULL;
return ptr->cdr == empty_list;
}
inline void push(Pair * &pc, FrameObj ** &top_ptr, Environment *envt) {
// if (pc->car == NULL)
// puts("oops");
if (pc->car->is_simple_obj()) // Not an opt invocation
{
*top_ptr++ = gc.attach(envt->get_obj(pc->car)); // Objectify the symbol
pc = pc->next; // Move to the next instruction
// if (pc == empty_list)
// puts("oops");
}
else // Operational Invocation
{
if (pc->car == empty_list)
throw NormalError(SYN_ERR_EMPTY_COMB);
*top_ptr++ = new RetAddr(pc, NULL); // Push the return address
if (!make_exec(TO_PAIR(pc->car)))
throw TokenError(pc->car->ext_repr(), RUN_ERR_WRONG_NUM_OF_ARGS);
// static_cast because of is_simple_obj() is false
pc = static_cast<Pair*>(pc->car); // Go deeper to enter the call
envt->get_obj(pc->car)->prepare(pc);
}
}
void print_stack(FrameObj **top) {
for (FrameObj **i = eval_stack; i < top; i++)
{
if ((*i)->is_ret_addr())
puts("<return addr>");
else
printf("%s\n", static_cast<EvalObj*>(*i)->ext_repr().c_str());
}
puts("");
}
EvalObj *Evaluator::run_expr(Pair *prog) {
FrameObj **top_ptr = eval_stack;
Pair *pc = prog;
Continuation *cont = NULL;
#ifdef GC_DEBUG
fprintf(stderr, "Start the evaluation...\n");
#endif
// envt is this->envt
push(pc, top_ptr, envt);
gc.attach(prog);
while((*eval_stack)->is_ret_addr())
{
if (top_ptr == eval_stack + EVAL_STACK_SIZE)
throw TokenError("Evaluation", RUN_ERR_STACK_OVERFLOW);
if (pc)
push(pc, top_ptr, envt);
else
{
Pair *args = empty_list;
while (!(*(--top_ptr))->is_ret_addr())
{
EvalObj* obj = static_cast<EvalObj*>(*top_ptr);
gc.expose(obj);
args = new Pair(obj, args);
}
//< static_cast because the while condition
RetAddr *ret_addr = static_cast<RetAddr*>(*top_ptr);
gc.attach(args);
if (!ret_addr->addr)
{
Pair *nexp = TO_PAIR(cont->proc_body->cdr);
cont->proc_body = nexp;
if (nexp == empty_list)
{
*top_ptr = gc.attach(args->car);
gc.expose(envt);
envt = cont->envt;
gc.attach(envt);
pc = cont->pc->next;
gc.expose(cont);
cont = cont->prev_cont;
gc.attach(cont);
}
else pc = nexp;
gc.expose(args);
top_ptr++;
}
else
{
EvalObj *opt = args->car;
if (opt->is_opt_obj())
pc = static_cast<OptObj*>(opt)->
call(args, envt, cont, top_ptr);
else
throw TokenError(opt->ext_repr(), SYN_ERR_CAN_NOT_APPLY);
gc.force();
}
}
}
gc.expose(prog);
// static_cast because the previous while condition
return static_cast<EvalObj*>(*(eval_stack));
}
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