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#include "mruby.h"
#include "mruby/compile.h"
#include "mruby/irep.h"
#include "mruby/proc.h"
#include "mruby/opcode.h"
static struct mrb_irep *
get_closure_irep(mrb_state *mrb, int level)
{
struct REnv *e = mrb->c->ci[-1].proc->env;
struct RProc *proc;
if (level == 0) {
return mrb->c->ci[-1].proc->body.irep;
}
while (--level) {
e = (struct REnv*)e->c;
if (!e) return NULL;
}
if (!e) return NULL;
proc = mrb->c->cibase[e->cioff].proc;
return proc->body.irep;
}
static inline mrb_code
search_variable(mrb_state *mrb, mrb_sym vsym)
{
mrb_irep *virep;
int level;
int pos;
for (level = 0; (virep = get_closure_irep(mrb, level)); level++) {
if (virep->lv == NULL) {
continue;
}
for (pos = 0; pos < virep->nlocals - 1; pos++) {
if (vsym == virep->lv[pos].name) {
return (MKARG_B(pos + 1) | MKARG_C(level));
}
}
}
return 0;
}
static void
patch_irep(mrb_state *mrb, mrb_irep *irep)
{
int i;
mrb_code c;
for (i = 0; i < irep->ilen; i++) {
c = irep->iseq[i];
switch(GET_OPCODE(c)){
case OP_SEND:
if (GETARG_C(c) != 0) {
break;
}
{
mrb_code arg = search_variable(mrb, irep->syms[GETARG_B(c)]);
if (arg != 0) {
/* must replace */
irep->iseq[i] = MKOPCODE(OP_GETUPVAR) | MKARG_A(GETARG_A(c)) | arg;
}
}
break;
case OP_MOVE:
/* src part */
if (GETARG_B(c) < irep->nlocals) {
mrb_code arg = search_variable(mrb, irep->lv[GETARG_B(c) - 1].name);
if (arg != 0) {
/* must replace */
irep->iseq[i] = MKOPCODE(OP_GETUPVAR) | MKARG_A(GETARG_A(c)) | arg;
}
}
/* dst part */
if (GETARG_A(c) < irep->nlocals) {
mrb_code arg = search_variable(mrb, irep->lv[GETARG_A(c) - 1].name);
if (arg != 0) {
/* must replace */
irep->iseq[i] = MKOPCODE(OP_SETUPVAR) | MKARG_A(GETARG_B(c)) | arg;
}
}
break;
}
}
}
static struct RProc*
create_proc_from_string(mrb_state *mrb, char *s, int len, mrb_value binding, char *file, mrb_int line)
{
mrbc_context *cxt;
struct mrb_parser_state *p;
struct RProc *proc;
struct REnv *e;
if (!mrb_nil_p(binding)) {
mrb_raise(mrb, E_ARGUMENT_ERROR, "Binding of eval must be nil.");
}
cxt = mrbc_context_new(mrb);
cxt->lineno = line;
if (file) {
mrbc_filename(mrb, cxt, file);
}
p = mrb_parser_new(mrb);
p->s = s;
p->send = s + len;
mrb_parser_parse(p, cxt);
if (0 < p->nerr) {
/* parse error */
char buf[256];
int n;
n = snprintf(buf, sizeof(buf), "line %d: %s\n", p->error_buffer[0].lineno, p->error_buffer[0].message);
mrb_parser_free(p);
mrbc_context_free(mrb, cxt);
mrb_exc_raise(mrb, mrb_exc_new(mrb, E_SYNTAX_ERROR, buf, n));
}
proc = mrb_generate_code(mrb, p);
e = (struct REnv*)mrb_obj_alloc(mrb, MRB_TT_ENV, (struct RClass*)mrb->c->ci[-1].proc->env);
e->mid = mrb->c->ci[-1].mid;
e->cioff = mrb->c->ci - mrb->c->cibase - 1;
e->stack = mrb->c->ci->stackent;
mrb->c->ci->env = e;
proc->env = e;
patch_irep(mrb, proc->body.irep);
mrb_parser_free(p);
mrbc_context_free(mrb, cxt);
if (proc == NULL) {
/* codegen error */
mrb_raise(mrb, E_SCRIPT_ERROR, "codegen error");
}
return proc;
}
static mrb_value
f_eval(mrb_state *mrb, mrb_value self)
{
char *s;
mrb_int len;
mrb_value binding = mrb_nil_value();
char *file = NULL;
mrb_int line = 1;
mrb_value ret;
struct RProc *proc;
mrb_get_args(mrb, "s|ozi", &s, &len, &binding, &file, &line);
proc = create_proc_from_string(mrb, s, len, binding, file, line);
ret = mrb_toplevel_run(mrb, proc);
if (mrb->exc) {
mrb_exc_raise(mrb, mrb_obj_value(mrb->exc));
}
return ret;
}
void
mrb_mruby_eval_gem_init(mrb_state* mrb)
{
mrb_define_module_function(mrb, mrb->kernel_module, "eval", f_eval, MRB_ARGS_REQ(1) | MRB_ARGS_OPT(3));
}
void
mrb_mruby_eval_gem_final(mrb_state* mrb)
{
}
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