mruby/src/codegen.c at master · javier/mruby · GitHub

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** codegen.c - mruby code generator

** See Copyright Notice in mruby.h

#undef CODEGEN_TEST

#define CODEGEN_DUMP

#include "mruby.h"

#include "mruby/irep.h"

#include "compile.h"

#include "mruby/proc.h"

#include "opcode.h"

#include "mruby/string.h"

#include <string.h>

#include <stdlib.h>

typedef mrb_ast_node node;

typedef struct mrb_parser_state parser_state;

struct loopinfo {

enum looptype {

LOOP_NORMAL,

LOOP_BLOCK,

LOOP_FOR,

LOOP_BEGIN,

LOOP_RESCUE,

} type;

int pc1, pc2, pc3, acc;

int ensure_level;

struct loopinfo *prev;

};

typedef struct scope {

mrb_state *mrb;

mrb_pool *mpool;

jmp_buf jmp;

struct scope *prev;

node *lv;

int sp;

int pc;

int lastlabel;

int ainfo;

struct loopinfo *loop;

int ensure_level;

mrb_code *iseq;

int icapa;

mrb_value *pool;

int plen;

int pcapa;

mrb_sym *syms;

int slen;

int nlocals;

int nregs;

int idx;

} codegen_scope;

static codegen_scope* scope_new(mrb_state *mrb, codegen_scope *prev, node *lv);

static void scope_finish(codegen_scope *s, int idx);

static struct loopinfo *loop_push(codegen_scope *s, enum looptype t);

static void loop_break(codegen_scope *s, node *tree);

static void loop_pop(codegen_scope *s, int val);

static void gen_assignment(codegen_scope *s, node *node, int sp, int val);

static void gen_vmassignment(codegen_scope *s, node *tree, int rhs, int val);

static void codegen(codegen_scope *s, node *tree, int val);

static void

codegen_error(codegen_scope *s, const char *message)

{

if (!s) return;

while (s->prev) {

mrb_pool_close(s->mpool);

s = s->prev;

}

mrb_pool_close(s->mpool);

fprintf(stderr, "codegen error: %s\n", message);

longjmp(s->jmp, 1);

}

static void*

codegen_palloc(codegen_scope *s, size_t len)

{

void *p = mrb_pool_alloc(s->mpool, len);

if (!p) codegen_error(s, "pool memory allocation");

return p;

}

void*

codegen_malloc(codegen_scope *s, size_t len)

{

void *p = mrb_malloc(s->mrb, len);

if (!p) codegen_error(s, "mrb_malloc");

return p;

}

void*

codegen_realloc(codegen_scope *s, void *p, size_t len)

{

p = mrb_realloc(s->mrb, p, len);

if (!p && len > 0) codegen_error(s, "mrb_realloc");

return p;

}

static int

new_label(codegen_scope *s)

{

s->lastlabel = s->pc;

return s->pc;

}

static inline void

genop(codegen_scope *s, mrb_code i)

{

if (s->pc == s->icapa) {

s->icapa *= 2;

s->iseq = codegen_realloc(s, s->iseq, sizeof(mrb_code)*s->icapa);

}

s->iseq[s->pc] = i;

s->pc++;

}

static void

genop_peep(codegen_scope *s, mrb_code i, int val)

{

// peephole optimization

if (!val && s->lastlabel != s->pc && s->pc > 0) {

mrb_code i0 = s->iseq[s->pc-1];

int c1 = GET_OPCODE(i);

int c0 = GET_OPCODE(i0);

switch (c1) {

case OP_MOVE:

switch (c0) {

case OP_MOVE:

if (GETARG_B(i) == GETARG_A(i0) && GETARG_A(i) == GETARG_B(i0) && GETARG_A(i) >= s->nlocals) {

// skip swapping OP_MOVE

return;

}

break;

case OP_LOADI:

if (GETARG_B(i) == GETARG_A(i0) && GETARG_A(i0) >= s->nlocals) {

s->iseq[s->pc-1] = MKOP_AsBx(OP_LOADI, GETARG_A(i), GETARG_sBx(i0));

return;

}

break;

case OP_ARRAY:

case OP_HASH:

case OP_RANGE:

case OP_AREF:

case OP_GETUPVAR:

if (GETARG_B(i) == GETARG_A(i0) && GETARG_A(i0) >= s->nlocals) {

s->iseq[s->pc-1] = MKOP_ABC(c0, GETARG_A(i), GETARG_B(i0), GETARG_C(i0));

return;

}

break;

case OP_LOADSYM:

case OP_GETGLOBAL:

case OP_GETIV:

case OP_GETCV:

case OP_GETCONST:

case OP_GETSPECIAL:

case OP_LOADL:

case OP_STRING:

case OP_GETMCNST:

if (GETARG_B(i) == GETARG_A(i0) && GETARG_A(i0) >= s->nlocals) {

s->iseq[s->pc-1] = MKOP_ABx(c0, GETARG_A(i), GETARG_Bx(i0));

return;

}

break;

case OP_SCLASS:

if (GETARG_B(i) == GETARG_A(i0) && GETARG_A(i0) >= s->nlocals) {

s->iseq[s->pc-1] = MKOP_AB(c0, GETARG_A(i), GETARG_B(i0));

return;

}

break;

case OP_LOADNIL:

case OP_LOADSELF:

case OP_LOADT:

case OP_LOADF:

case OP_OCLASS:

if (GETARG_B(i) == GETARG_A(i0) && GETARG_A(i0) >= s->nlocals) {

s->iseq[s->pc-1] = MKOP_A(c0, GETARG_A(i));

return;

}

break;

}

break;

case OP_SETIV:

case OP_SETCV:

case OP_SETCONST:

case OP_SETMCNST:

switch (c0) {

case OP_MOVE:

if (GETARG_A(i) == GETARG_A(i0)) {

s->iseq[s->pc-1] = MKOP_ABx(c1, GETARG_B(i0), GETARG_Bx(i));

return;

}

break;

}

break;

case OP_SETUPVAR:

switch (c0) {

case OP_MOVE:

if (GETARG_A(i) == GETARG_A(i0)) {

s->iseq[s->pc-1] = MKOP_ABC(c1, GETARG_B(i0), GETARG_B(i), GETARG_C(i));

return;

}

break;

}

break;

case OP_EPOP:

if (c0 == OP_EPOP) {

s->iseq[s->pc-1] = MKOP_A(OP_EPOP, GETARG_A(i0)+GETARG_A(i));

return;

}

break;

case OP_POPERR:

if (c0 == OP_POPERR) {

s->iseq[s->pc-1] = MKOP_A(OP_POPERR, GETARG_A(i0)+GETARG_A(i));

return;

}

break;

}

genop(s, i);

}

static void

scope_error(codegen_scope *s)

{

exit(1);

}

static inline void

dispatch(codegen_scope *s, int pc)

{

int diff = s->pc - pc;

mrb_code i = s->iseq[pc];

int c = GET_OPCODE(i);

s->lastlabel = s->pc;

switch (c) {

case OP_JMP:

case OP_JMPIF:

case OP_JMPNOT:

case OP_ONERR:

break;

default:

fprintf(stderr, "bug: dispatch on non JMP op\n");

scope_error(s);

}

s->iseq[pc] = MKOP_AsBx(c, GETARG_A(i), diff);

}

static void

dispatch_linked(codegen_scope *s, int pc)

{

mrb_code i;

int pos;

if (!pc) return;

for (;;) {

i = s->iseq[pc];

pos = GETARG_sBx(i);

dispatch(s, pc);

if (!pos) break;

pc = pos;

}

#define nregs_update do {if (s->sp > s->nregs) s->nregs = s->sp;} while (0)

static void

push_(codegen_scope *s)

{

if (s->sp > 511) {

codegen_error(s, "too complex expression");

}

s->sp++;

nregs_update;

}

#if 0

static void

push_n_(codegen_scope *s, int n)

{

if (s->sp + n > 511) {

codegen_error(s, "too complex expression");

}

s->sp += n;

nregs_update;

}

#endif

#define push() push_(s)

#define push_n(n) push_n_(s, n)

#define pop() (s->sp--)

#define pop_n(n) (s->sp-=(n))

#define cursp() (s->sp)

static inline int

new_lit(codegen_scope *s, mrb_value val)

{

int i;

for (i=0; i<s->plen; i++) {

if (memcmp(&s->pool[i], &val, sizeof(mrb_value)) == 0) return i;

}

if (s->plen == s->pcapa) {

s->pcapa *= 2;

s->pool = codegen_realloc(s, s->pool, sizeof(mrb_value)*s->pcapa);

}

s->pool[s->plen] = val;

return s->plen++;

}

static inline int

new_msym(codegen_scope *s, mrb_sym sym)

{

int i, len;

len = s->slen;

if (len > 255) len = 255;

for (i=0; i<len; i++) {

if (s->syms[i] == sym) return i;

if (s->syms[i] == 0) break;

}

if (i > 255) {

codegen_error(s, "too many symbols (max 256)");

}

s->syms[i] = sym;

if (i == s->slen) s->slen++;

return i;

}

static inline int

new_sym(codegen_scope *s, mrb_sym sym)

{

int i;

for (i=0; i<s->slen; i++) {

if (s->syms[i] == sym) return i;

}

if (s->slen > 125 && s->slen < 256) {

s->syms = codegen_realloc(s, s->syms, sizeof(mrb_sym)*65536);

memset(s->syms+s->slen, 0, sizeof(mrb_sym)*(256-s->slen));

s->slen = 256;

}

s->syms[s->slen] = sym;

return s->slen++;

}

static int

node_len(node *tree)

{

int n = 0;

while (tree) {

n++;

tree = tree->cdr;

}

return n;

}

#define lv_name(lv) ((mrb_sym)(lv)->car)

static int

lv_idx(codegen_scope *s, mrb_sym id)

{

node *lv = s->lv;

int n = 1;

while (lv) {

if (lv_name(lv) == id) return n;

n++;

lv = lv->cdr;

}

return 0;

}

#define NOVAL 0

#define VAL 1

static void

for_body(codegen_scope *s, node *tree)

{

codegen_scope *prev = s;

int idx, base = s->idx;

struct loopinfo *lp;

node *n2;

mrb_code c;

// generate receiver

codegen(s, tree->cdr->car, VAL);

// generate loop-block

s = scope_new(s->mrb, s, tree->car);

idx = s->idx;

lp = loop_push(s, LOOP_FOR);

lp->pc1 = new_label(s);

// generate loop variable

n2 = tree->car;

if (n2->car && !n2->car->cdr && !n2->cdr) {

genop(s, MKOP_Ax(OP_ENTER, 1<<18));

gen_assignment(s, n2->car->car, 1, NOVAL);

}

else {

genop(s, MKOP_Ax(OP_ENTER, 1<<18));

gen_vmassignment(s, n2, 1, VAL);

}

codegen(s, tree->cdr->cdr->car, VAL);

pop();

c = s->iseq[s->pc-1];

if (GET_OPCODE(c) != OP_RETURN || GETARG_B(c) != OP_R_NORMAL || s->pc == s->lastlabel) {

genop(s, MKOP_AB(OP_RETURN, cursp(), OP_R_NORMAL));

}

loop_pop(s, NOVAL);

scope_finish(s, idx);

s = prev;

genop(s, MKOP_Abc(OP_LAMBDA, cursp(), idx - base, OP_L_BLOCK));

pop();

idx = new_msym(s, mrb_intern(s->mrb, "each"));

genop(s, MKOP_ABC(OP_SEND, cursp(), idx, 0));

}

static int

lambda_body(codegen_scope *s, node *tree, int blk)

{

int idx, base = s->idx;

mrb_code c;

s = scope_new(s->mrb, s, tree->car);

idx = s->idx;

if (blk) {

struct loopinfo *lp = loop_push(s, LOOP_BLOCK);

lp->pc1 = new_label(s);

}

tree = tree->cdr;

if (tree->car) {

int ma, oa, ra, pa, ka, kd, ba, a;

int pos, i;

node *n, *opt;

ma = node_len(tree->car->car);

n = tree->car->car;

while (n) {

n = n->cdr;

}

oa = node_len(tree->car->cdr->car);

ra = tree->car->cdr->cdr->car ? 1 : 0;

pa = node_len(tree->car->cdr->cdr->cdr->car);

ka = kd = 0;

ba = tree->car->cdr->cdr->cdr->cdr ? 1 : 0;

a = ((ma & 0x1f) << 18)

| ((oa & 0x1f) << 13)

| ((ra & 1) << 12)

| ((pa & 0x1f) << 7)

| ((ka & 0x1f) << 2)

| ((kd & 1)<< 1)

| (ba & 1);

s->ainfo = (((ma+oa) & 0x3f) << 6) /* (12bits = 6:1:5) */

| ((ra & 1) << 5)

| (pa & 0x1f);

genop(s, MKOP_Ax(OP_ENTER, a));

pos = new_label(s);

for (i=0; i<oa; i++) {

new_label(s);

genop(s, MKOP_Ax(OP_JMP, 0));

}

if (oa > 0) {

genop(s, MKOP_Ax(OP_JMP, 0));

}

opt = tree->car->cdr->car;

i = 0;

while (opt) {

int idx;

dispatch(s, pos+i);

codegen(s, opt->car->cdr, VAL);

idx = lv_idx(s, (mrb_sym)opt->car->car);

pop();

genop_peep(s, MKOP_AB(OP_MOVE, idx, cursp()), NOVAL);

i++;

opt = opt->cdr;

}

if (oa > 0) {

dispatch(s, pos+i);

}

codegen(s, tree->cdr->car, VAL);

pop();

c = s->iseq[s->pc-1];

if (GET_OPCODE(c) != OP_RETURN || GETARG_B(c) != OP_R_NORMAL || s->pc == s->lastlabel) {

genop(s, MKOP_AB(OP_RETURN, cursp(), OP_R_NORMAL));

}

if (blk) {

loop_pop(s, NOVAL);

}

scope_finish(s, idx);

return idx - base;

}

static int

scope_body(codegen_scope *s, node *tree)

{

codegen_scope *scope = scope_new(s->mrb, s, tree->car);

int idx = scope->idx;

if (!s->iseq) {

codegen(scope, tree->cdr, NOVAL);

genop(scope, MKOP_A(OP_STOP, 0));

}

else {

codegen(scope, tree->cdr, VAL);

genop(scope, MKOP_AB(OP_RETURN, cursp(), OP_R_NORMAL));

}

scope_finish(scope, idx);

return idx - s->idx;

}

static int

nosplat(node *t)

{

while (t) {

if ((intptr_t)t->car->car == NODE_SPLAT) return 0;

t = t->cdr;

}

return 1;

}

static mrb_sym

attrsym(codegen_scope *s, mrb_sym a)

{

const char *name = mrb_sym2name(s->mrb, a);

char *name2;

size_t len = strlen(name);

name2 = codegen_palloc(s, len+1);

strcpy(name2, name);

name2[len] = '=';

name2[len+1] = '\0';

return mrb_intern(s->mrb, name2);

}

static int

gen_values(codegen_scope *s, node *t)

{

int n = 0;

while (t) {

if ((intptr_t)t->car->car == NODE_SPLAT) { // splat mode

pop_n(n);

genop(s, MKOP_ABC(OP_ARRAY, cursp(), cursp(), n));

push();

codegen(s, t->car, VAL);

pop(); pop();

genop(s, MKOP_AB(OP_ARYCAT, cursp(), cursp()+1));

t = t->cdr;

while (t) {

push();

codegen(s, t->car, VAL);

pop(); pop();

if ((intptr_t)t->car->car == NODE_SPLAT) {

genop(s, MKOP_AB(OP_ARYCAT, cursp(), cursp()+1));

}

else {

genop(s, MKOP_AB(OP_ARYPUSH, cursp(), cursp()+1));

}

t = t->cdr;

}

return -1;

}

// normal (no splat) mode

codegen(s, t->car, VAL);

n++;

t = t->cdr;

}

return n;

}

#define CALL_MAXARGS 127

static void

gen_call(codegen_scope *s, node *tree, mrb_sym name, int sp, int val)

{

mrb_sym sym = name ? name : (mrb_sym)tree->cdr->car;

int idx;

int n = 0, noop = 0, sendv = 0;

codegen(s, tree->car, VAL); /* receiver */

idx = new_msym(s, sym);

tree = tree->cdr->cdr->car;

if (tree) {

n = gen_values(s, tree->car);

if (n < 0) {

n = noop = sendv = 1;

push();

}

if (sp) {

if (sendv) {

pop();

genop(s, MKOP_AB(OP_ARYPUSH, cursp(), sp));

push();

}

else {

genop(s, MKOP_AB(OP_MOVE, cursp(), sp));

push();

n++;

}

if (tree && tree->cdr) {

noop = 1;

codegen(s, tree->cdr, VAL);

pop();

}

else {

genop(s, MKOP_A(OP_LOADNIL, cursp()));

}

pop_n(n+1);

{

const char *name = mrb_sym2name(s->mrb, sym);

if (!noop && name[0] == '+' && strlen(name) == 1) {

genop(s, MKOP_ABC(OP_ADD, cursp(), idx, n));

}

else if (!noop && name[0] == '-' && strlen(name) == 1) {

genop(s, MKOP_ABC(OP_SUB, cursp(), idx, n));

}

else if (!noop && name[0] == '<' && strlen(name) == 1) {

genop(s, MKOP_ABC(OP_LT, cursp(), idx, n));

}

else if (!noop && name[0] == '<' && strlen(name) == 2 && name[1] == '=') {

genop(s, MKOP_ABC(OP_LE, cursp(), idx, n));

}

else if (!noop && name[0] == '>' && strlen(name) == 1) {

genop(s, MKOP_ABC(OP_GT, cursp(), idx, n));

}

else if (!noop && name[0] == '>' && strlen(name) == 2 && name[1] == '=') {

genop(s, MKOP_ABC(OP_GE, cursp(), idx, n));

}

else {

if (sendv) n = CALL_MAXARGS;

genop(s, MKOP_ABC(OP_SEND, cursp(), idx, n));

}

if (val) {

push();

}

static void

gen_assignment(codegen_scope *s, node *node, int sp, int val)

{

int idx;

int type = (intptr_t)node->car;

node = node->cdr;

switch ((intptr_t)type) {

case NODE_GVAR:

idx = new_sym(s, (mrb_sym)node);

genop_peep(s, MKOP_ABx(OP_SETGLOBAL, sp, idx), val);

break;

case NODE_LVAR:

idx = lv_idx(s, (mrb_sym)node);

if (idx > 0) {

if (idx != sp) {

genop_peep(s, MKOP_AB(OP_MOVE, idx, sp), val);

}

break;

}

else { /* upvar */

int lv = 0;

codegen_scope *up = s->prev;

while (up) {

idx = lv_idx(up, (mrb_sym)node);

if (idx > 0) {

genop_peep(s, MKOP_ABC(OP_SETUPVAR, sp, idx, lv), val);

break;

}

lv++;

up = up->prev;

}

// assert(up!=0);

}

break;

case NODE_IVAR:

idx = new_sym(s, (mrb_sym)node);

genop_peep(s, MKOP_ABx(OP_SETIV, sp, idx), val);

break;

case NODE_CVAR:

idx = new_sym(s, (mrb_sym)node);

genop_peep(s, MKOP_ABx(OP_SETCV, sp, idx), val);

break;

case NODE_CONST:

idx = new_sym(s, (mrb_sym)node);

genop_peep(s, MKOP_ABx(OP_SETCONST, sp, idx), val);

break;

case NODE_COLON2:

idx = new_sym(s, (mrb_sym)node->cdr);

genop_peep(s, MKOP_AB(OP_MOVE, cursp(), sp), NOVAL);

push();

codegen(s, node->car, VAL);

pop_n(2);

genop_peep(s, MKOP_ABx(OP_SETMCNST, cursp(), idx), val);

break;

case NODE_CALL:

push();

gen_call(s, node, attrsym(s, (mrb_sym)node->cdr->car), sp, val);

val = NOVAL; /* push should have done in gen_call() */

break;

default:

printf("unknown lhs %d\n", type);

break;

}

if (val) push();

}

static void

gen_vmassignment(codegen_scope *s, node *tree, int rhs, int val)

{

int n = 0, post = 0;

node *t, *p;

if (tree->car) { /* pre */

t = tree->car;

n = 0;

while (t) {

genop(s, MKOP_ABC(OP_AREF, cursp(), rhs, n));

gen_assignment(s, t->car, cursp(), NOVAL);

n++;

t = t->cdr;

}

t = tree->cdr;

if (t) {

if (t->cdr) { /* post count */

p = t->cdr->car;

while (p) {

post++;

p = p->cdr;

}

if (val) {

genop(s, MKOP_AB(OP_MOVE, cursp(), rhs));

push();

}

pop();

genop(s, MKOP_ABC(OP_APOST, cursp(), n, post));

n = 1;

if (t->car) { /* rest */

gen_assignment(s, t->car, cursp(), NOVAL);

}

if (t->cdr && t->cdr->car) {

t = t->cdr->car;

while (t) {

gen_assignment(s, t->car, cursp()+n, NOVAL);

t = t->cdr;

n++;

}

static void

raise_error(codegen_scope *s, const char *msg)

{

int idx = new_lit(s, mrb_str_new_cstr(s->mrb, msg));

genop(s, MKOP_ABx(OP_ERR, 0, idx));

}

static void

codegen(codegen_scope *s, node *tree, int val)

{

int nt;

if (!tree) return;

nt = (intptr_t)tree->car;

tree = tree->cdr;

switch (nt) {

case NODE_BEGIN:

while (tree) {

codegen(s, tree->car, tree->cdr ? NOVAL : val);

tree = tree->cdr;

}

break;

case NODE_RESCUE:

{

int onerr, noexc, exend, pos1, pos2, tmp;

struct loopinfo *lp;

onerr = new_label(s);

genop(s, MKOP_Bx(OP_ONERR, 0));

lp = loop_push(s, LOOP_BEGIN);

lp->pc1 = onerr;

if (tree->car) {

codegen(s, tree->car, val);

}

lp->type = LOOP_RESCUE;

noexc = new_label(s);

genop(s, MKOP_Bx(OP_JMP, 0));

dispatch(s, onerr);

tree = tree->cdr;

exend = 0;

pos1 = 0;

if (tree->car) {

node *n2 = tree->car;

int exc = cursp();

genop(s, MKOP_A(OP_RESCUE, exc));

push();

while (n2) {

node *n3 = n2->car;

if (pos1) dispatch(s, pos1);

if (n3->car) {

node *n4 = n3->car;

pos2 = 0;

while (n4) {

codegen(s, n4->car, VAL);

genop(s, MKOP_AB(OP_MOVE, cursp(), exc));

push();

genop(s, MKOP_A(OP_LOADNIL, cursp()));

pop(); pop();

genop(s, MKOP_ABC(OP_SEND, cursp(), new_msym(s, mrb_intern(s->mrb, "===")), 1));

tmp = new_label(s);

genop(s, MKOP_AsBx(OP_JMPIF, cursp(), pos2));

pos2 = tmp;

n4 = n4->cdr;

}

pos1 = new_label(s);

genop(s, MKOP_Bx(OP_JMP, 0));

dispatch_linked(s, pos2);

}

pop();

if (n3->cdr->car) {

gen_assignment(s, n3->cdr->car, exc, NOVAL);

}

if (n3->cdr->cdr->car) {

codegen(s, n3->cdr->cdr->car, val);

}

tmp = new_label(s);

genop(s, MKOP_AsBx(OP_JMP, cursp(), exend));

exend = tmp;

n2 = n2->cdr;

push();

}

if (pos1) {

dispatch(s, pos1);

genop(s, MKOP_A(OP_RAISE, exc));

}

tree = tree->cdr;

dispatch(s, noexc);

genop(s, MKOP_A(OP_POPERR, 1));

if (tree->car) {

codegen(s, tree->car, val);

}

dispatch_linked(s, exend);

loop_pop(s, NOVAL);

}

break;

case NODE_ENSURE:

{

int idx;

int epush = s->pc;

genop(s, MKOP_Bx(OP_EPUSH, 0));

s->ensure_level++;

codegen(s, tree->car, val);

idx = scope_body(s, tree->cdr);

s->iseq[epush] = MKOP_Bx(OP_EPUSH, idx);

s->ensure_level--;

genop_peep(s, MKOP_A(OP_EPOP, 1), NOVAL);

}

break;

case NODE_LAMBDA:

{

int idx = lambda_body(s, tree, 1);

genop(s, MKOP_Abc(OP_LAMBDA, cursp(), idx, OP_L_LAMBDA));

push();

}

break;

case NODE_BLOCK:

{

int idx = lambda_body(s, tree, 1);

genop(s, MKOP_Abc(OP_LAMBDA, cursp(), idx, OP_L_BLOCK));

push();

}

break;

case NODE_IF:

{

int pos1, pos2;

node *e = tree->cdr->cdr->car;

codegen(s, tree->car, VAL);

pop();

pos1 = new_label(s);

genop(s, MKOP_AsBx(OP_JMPNOT, cursp(), 0));

codegen(s, tree->cdr->car, val);

if (e) {

if (val) pop();

pos2 = new_label(s);

genop(s, MKOP_sBx(OP_JMP, 0));

dispatch(s, pos1);

codegen(s, e, val);

dispatch(s, pos2);

}

else {

if (val) {

pop();

genop(s, MKOP_A(OP_LOADNIL, cursp()));

push();

}

dispatch(s, pos1);

}

break;

case NODE_AND:

{

int pos;

codegen(s, tree->car, VAL);

pos = new_label(s);

pop();

genop(s, MKOP_AsBx(OP_JMPNOT, cursp(), 0));

codegen(s, tree->cdr, val);

dispatch(s, pos);

}

break;

case NODE_OR:

{

int pos;

codegen(s, tree->car, VAL);

pos = new_label(s);

pop();

genop(s, MKOP_AsBx(OP_JMPIF, cursp(), 0));

codegen(s, tree->cdr, val);

dispatch(s, pos);

}

break;

case NODE_WHILE:

{

struct loopinfo *lp = loop_push(s, LOOP_NORMAL);

lp->pc1 = new_label(s);

codegen(s, tree->car, VAL);

pop();

lp->pc2 = new_label(s);

genop(s, MKOP_AsBx(OP_JMPNOT, cursp(), 0));

codegen(s, tree->cdr, NOVAL);

genop(s, MKOP_sBx(OP_JMP, lp->pc1 - s->pc));

dispatch(s, lp->pc2);

loop_pop(s, val);

}

break;

case NODE_UNTIL:

{

struct loopinfo *lp = loop_push(s, LOOP_NORMAL);

lp->pc1 = new_label(s);

codegen(s, tree->car, VAL);

pop();

lp->pc2 = new_label(s);

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mruby/src/codegen.c at master · javier/mruby · GitHub

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