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b53cd3ce255f43164cae87f2abbd4f573676cbab
mruby-mruby/mrbgems/mruby-compiler/core/codegen.c
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Yukihiro "Matz" Matsumoto b53cd3ce25 codegen.c: fix evaluation order of attribute assignment.
2022-01-21 10:41:14 +09:00

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/*
** codegen.c - mruby code generator
**
** See Copyright Notice in mruby.h
*/
#include <mruby.h>
#include <mruby/compile.h>
#include <mruby/proc.h>
#include <mruby/dump.h>
#include <mruby/numeric.h>
#include <mruby/string.h>
#include <mruby/debug.h>
#include <mruby/presym.h>
#include "node.h"
#include <mruby/opcode.h>
#include <mruby/re.h>
#include <mruby/throw.h>
#include <ctype.h>
#include <string.h>
#ifndef MRB_CODEGEN_LEVEL_MAX
#define MRB_CODEGEN_LEVEL_MAX 256
#endif
#define MAXARG_S (1<<16)
typedef mrb_ast_node node;
typedef struct mrb_parser_state parser_state;
enum looptype {
LOOP_NORMAL,
LOOP_BLOCK,
LOOP_FOR,
LOOP_BEGIN,
LOOP_RESCUE,
};
struct loopinfo {
enum looptype type;
uint32_t pc0; /* `next` destination */
uint32_t pc1; /* `redo` destination */
uint32_t pc2; /* `break` destination */
int reg; /* destination register */
struct loopinfo *prev;
};
typedef struct scope {
mrb_state *mrb;
mrb_pool *mpool;
struct scope *prev;
node *lv;
uint16_t sp;
uint32_t pc;
uint32_t lastpc;
uint32_t lastlabel;
size_t ainfo:15;
mrb_bool mscope:1;
struct loopinfo *loop;
mrb_sym filename_sym;
uint16_t lineno;
mrb_code *iseq;
uint16_t *lines;
uint32_t icapa;
mrb_irep *irep;
mrb_pool_value *pool;
mrb_sym *syms;
mrb_irep **reps;
struct mrb_irep_catch_handler *catch_table;
uint32_t pcapa, scapa, rcapa;
uint16_t nlocals;
uint16_t nregs;
int ai;
int debug_start_pos;
uint16_t filename_index;
parser_state* parser;
int rlev; /* recursion levels */
} codegen_scope;
static codegen_scope* scope_new(mrb_state *mrb, codegen_scope *prev, node *lv);
static void scope_finish(codegen_scope *s);
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);
/*
* The search for catch handlers starts at the end of the table in mrb_vm_run().
* Therefore, the next handler to be added must meet one of the following conditions.
* - Larger start position
* - Same start position but smaller end position
*/
static int catch_handler_new(codegen_scope *s);
static void catch_handler_set(codegen_scope *s, int ent, enum mrb_catch_type type, uint32_t begin, uint32_t end, uint32_t target);
static void gen_assignment(codegen_scope *s, node *tree, node *rhs, int sp, int val);
static void gen_vmassignment(codegen_scope *s, node *tree, int sp, int val);
static void codegen(codegen_scope *s, node *tree, int val);
static void raise_error(codegen_scope *s, const char *msg);
static void
codegen_error(codegen_scope *s, const char *message)
{
if (!s) return;
#ifndef MRB_NO_STDIO
if (s->filename_sym && s->lineno) {
const char *filename = mrb_sym_name_len(s->mrb, s->filename_sym, NULL);
fprintf(stderr, "%s:%d: %s\n", filename, s->lineno, message);
}
else {
fprintf(stderr, "%s\n", message);
}
#endif
while (s->prev) {
codegen_scope *tmp = s->prev;
if (s->irep) {
mrb_free(s->mrb, s->iseq);
for (int i=0; i<s->irep->plen; i++) {
mrb_pool_value *pv = &s->pool[i];
if ((pv->tt & 0x3) == IREP_TT_STR || pv->tt == IREP_TT_BIGINT) {
mrb_free(s->mrb, (void*)pv->u.str);
}
}
mrb_free(s->mrb, s->pool);
mrb_free(s->mrb, s->syms);
mrb_free(s->mrb, s->catch_table);
if (s->reps) {
/* copied from mrb_irep_free() in state.c */
for (int i=0; i<s->irep->rlen; i++) {
if (s->reps[i])
mrb_irep_decref(s->mrb, (mrb_irep*)s->reps[i]);
}
mrb_free(s->mrb, s->reps);
}
mrb_free(s->mrb, s->lines);
}
mrb_pool_close(s->mpool);
s = tmp;
}
MRB_THROW(s->mrb->jmp);
}
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;
}
static void*
codegen_realloc(codegen_scope *s, void *p, size_t len)
{
p = mrb_realloc_simple(s->mrb, p, len);
if (!p && len > 0) codegen_error(s, "mrb_realloc");
return p;
}
static void
check_no_ext_ops(codegen_scope *s, uint16_t a, uint16_t b)
{
if (s->parser->no_ext_ops && (a | b) > 0xff) {
codegen_error(s, "need OP_EXTs instruction (currently OP_EXTs are prohibited)");
}
}
static int
new_label(codegen_scope *s)
{
return s->lastlabel = s->pc;
}
static void
emit_B(codegen_scope *s, uint32_t pc, uint8_t i)
{
if (pc >= s->icapa) {
if (pc == UINT32_MAX) {
codegen_error(s, "too big code block");
}
if (pc >= UINT32_MAX / 2) {
pc = UINT32_MAX;
}
else {
s->icapa *= 2;
}
s->iseq = (mrb_code *)codegen_realloc(s, s->iseq, sizeof(mrb_code)*s->icapa);
if (s->lines) {
s->lines = (uint16_t*)codegen_realloc(s, s->lines, sizeof(uint16_t)*s->icapa);
}
}
if (s->lines) {
if (s->lineno > 0 || pc == 0)
s->lines[pc] = s->lineno;
else
s->lines[pc] = s->lines[pc-1];
}
s->iseq[pc] = i;
}
static void
emit_S(codegen_scope *s, int pc, uint16_t i)
{
uint8_t hi = i>>8;
uint8_t lo = i&0xff;
emit_B(s, pc, hi);
emit_B(s, pc+1, lo);
}
static void
gen_B(codegen_scope *s, uint8_t i)
{
emit_B(s, s->pc, i);
s->pc++;
}
static void
gen_S(codegen_scope *s, uint16_t i)
{
emit_S(s, s->pc, i);
s->pc += 2;
}
static void
genop_0(codegen_scope *s, mrb_code i)
{
s->lastpc = s->pc;
gen_B(s, i);
}
static void
genop_1(codegen_scope *s, mrb_code i, uint16_t a)
{
s->lastpc = s->pc;
check_no_ext_ops(s, a, 0);
if (a > 0xff) {
gen_B(s, OP_EXT1);
gen_B(s, i);
gen_S(s, a);
}
else {
gen_B(s, i);
gen_B(s, (uint8_t)a);
}
}
static void
genop_2(codegen_scope *s, mrb_code i, uint16_t a, uint16_t b)
{
s->lastpc = s->pc;
check_no_ext_ops(s, a, b);
if (a > 0xff && b > 0xff) {
gen_B(s, OP_EXT3);
gen_B(s, i);
gen_S(s, a);
gen_S(s, b);
}
else if (b > 0xff) {
gen_B(s, OP_EXT2);
gen_B(s, i);
gen_B(s, (uint8_t)a);
gen_S(s, b);
}
else if (a > 0xff) {
gen_B(s, OP_EXT1);
gen_B(s, i);
gen_S(s, a);
gen_B(s, (uint8_t)b);
}
else {
gen_B(s, i);
gen_B(s, (uint8_t)a);
gen_B(s, (uint8_t)b);
}
}
static void
genop_3(codegen_scope *s, mrb_code i, uint16_t a, uint16_t b, uint8_t c)
{
genop_2(s, i, a, b);
gen_B(s, c);
}
static void
genop_2S(codegen_scope *s, mrb_code i, uint16_t a, uint16_t b)
{
genop_1(s, i, a);
gen_S(s, b);
}
static void
genop_2SS(codegen_scope *s, mrb_code i, uint16_t a, uint32_t b)
{
genop_1(s, i, a);
gen_S(s, b>>16);
gen_S(s, b&0xffff);
}
static void
genop_W(codegen_scope *s, mrb_code i, uint32_t a)
{
uint8_t a1 = (a>>16) & 0xff;
uint8_t a2 = (a>>8) & 0xff;
uint8_t a3 = a & 0xff;
s->lastpc = s->pc;
gen_B(s, i);
gen_B(s, a1);
gen_B(s, a2);
gen_B(s, a3);
}
#define NOVAL 0
#define VAL 1
static mrb_bool
no_optimize(codegen_scope *s)
{
if (s && s->parser && s->parser->no_optimize)
return TRUE;
return FALSE;
}
struct mrb_insn_data
mrb_decode_insn(const mrb_code *pc)
{
struct mrb_insn_data data = { 0 };
if (pc == 0) return data;
data.addr = pc;
mrb_code insn = READ_B();
uint16_t a = 0;
uint16_t b = 0;
uint16_t c = 0;
switch (insn) {
#define FETCH_Z() /* empty */
#define OPCODE(i,x) case OP_ ## i: FETCH_ ## x (); break;
#include "mruby/ops.h"
#undef OPCODE
}
switch (insn) {
case OP_EXT1:
insn = READ_B();
switch (insn) {
#define OPCODE(i,x) case OP_ ## i: FETCH_ ## x ## _1 (); break;
#include "mruby/ops.h"
#undef OPCODE
}
break;
case OP_EXT2:
insn = READ_B();
switch (insn) {
#define OPCODE(i,x) case OP_ ## i: FETCH_ ## x ## _2 (); break;
#include "mruby/ops.h"
#undef OPCODE
}
break;
case OP_EXT3:
insn = READ_B();
switch (insn) {
#define OPCODE(i,x) case OP_ ## i: FETCH_ ## x ## _3 (); break;
#include "mruby/ops.h"
#undef OPCODE
}
break;
default:
break;
}
data.insn = insn;
data.a = a;
data.b = b;
data.c = c;
return data;
}
#undef OPCODE
#define Z 1
#define S 3
#define W 4
#define OPCODE(_,x) x,
/* instruction sizes */
static uint8_t mrb_insn_size[] = {
#define B 2
#define BB 3
#define BBB 4
#define BS 4
#define BSS 6
#include "mruby/ops.h"
#undef B
#undef BB
#undef BBB
#undef BS
#undef BSS
};
/* EXT1 instruction sizes */
static uint8_t mrb_insn_size1[] = {
#define B 3
#define BB 4
#define BBB 5
#define BS 5
#define BSS 7
#include "mruby/ops.h"
#undef B
#undef BS
#undef BSS
};
/* EXT2 instruction sizes */
static uint8_t mrb_insn_size2[] = {
#define B 2
#define BS 4
#define BSS 6
#include "mruby/ops.h"
#undef B
#undef BB
#undef BBB
#undef BS
#undef BSS
};
/* EXT3 instruction sizes */
#define B 3
#define BB 5
#define BBB 6
#define BS 5
#define BSS 7
static uint8_t mrb_insn_size3[] = {
#include "mruby/ops.h"
};
#undef B
#undef BB
#undef BBB
#undef BS
#undef BSS
#undef OPCODE
static const mrb_code*
mrb_prev_pc(codegen_scope *s, const mrb_code *pc)
{
const mrb_code *prev_pc = NULL;
const mrb_code *i = s->iseq;
while (i<pc) {
uint8_t insn = i[0];
prev_pc = i;
switch (insn) {
case OP_EXT1:
i += mrb_insn_size1[i[1]] + 1;
break;
case OP_EXT2:
i += mrb_insn_size2[i[1]] + 1;
break;
case OP_EXT3:
i += mrb_insn_size3[i[1]] + 1;
break;
default:
i += mrb_insn_size[insn];
break;
}
}
return prev_pc;
}
#define pc_addr(s) &((s)->iseq[(s)->pc])
#define addr_pc(s, addr) (uint32_t)((addr) - s->iseq)
#define rewind_pc(s) s->pc = s->lastpc
static struct mrb_insn_data
mrb_last_insn(codegen_scope *s)
{
if (s->pc == 0) {
struct mrb_insn_data data = { OP_NOP, 0 };
return data;
}
return mrb_decode_insn(&s->iseq[s->lastpc]);
}
static mrb_bool
no_peephole(codegen_scope *s)
{
return no_optimize(s) || s->lastlabel == s->pc || s->pc == 0 || s->pc == s->lastpc;
}
#define JMPLINK_START UINT32_MAX
static void
gen_jmpdst(codegen_scope *s, uint32_t pc)
{
if (pc == JMPLINK_START) {
pc = 0;
}
uint32_t pos2 = s->pc+2;
int32_t off = pc - pos2;
if (off > INT16_MAX || INT16_MIN > off) {
codegen_error(s, "too big jump offset");
}
gen_S(s, (uint16_t)off);
}
static uint32_t
genjmp(codegen_scope *s, mrb_code i, uint32_t pc)
{
uint32_t pos;
genop_0(s, i);
pos = s->pc;
gen_jmpdst(s, pc);
return pos;
}
#define genjmp_0(s,i) genjmp(s,i,JMPLINK_START)
static uint32_t
genjmp2(codegen_scope *s, mrb_code i, uint16_t a, uint32_t pc, int val)
{
uint32_t pos;
if (!no_peephole(s) && !val) {
struct mrb_insn_data data = mrb_last_insn(s);
switch (data.insn) {
case OP_MOVE:
if (data.a == a && data.a > s->nlocals) {
rewind_pc(s);
a = data.b;
}
break;
case OP_LOADNIL:
case OP_LOADF:
if (data.a == a || data.a > s->nlocals) {
s->pc = addr_pc(s, data.addr);
if (i == OP_JMPNOT || (i == OP_JMPNIL && data.insn == OP_LOADNIL)) {
return genjmp(s, OP_JMP, pc);
}
else { /* OP_JMPIF */
return JMPLINK_START;
}
}
break;
case OP_LOADT: case OP_LOADI: case OP_LOADINEG: case OP_LOADI__1:
case OP_LOADI_0: case OP_LOADI_1: case OP_LOADI_2: case OP_LOADI_3:
case OP_LOADI_4: case OP_LOADI_5: case OP_LOADI_6: case OP_LOADI_7:
if (data.a == a || data.a > s->nlocals) {
s->pc = addr_pc(s, data.addr);
if (i == OP_JMPIF) {
return genjmp(s, OP_JMP, pc);
}
else { /* OP_JMPNOT and OP_JMPNIL */
return JMPLINK_START;
}
}
break;
}
}
if (a > 0xff) {
check_no_ext_ops(s, a, 0);
gen_B(s, OP_EXT1);
genop_0(s, i);
gen_S(s, a);
}
else {
genop_0(s, i);
gen_B(s, (uint8_t)a);
}
pos = s->pc;
gen_jmpdst(s, pc);
return pos;
}
#define genjmp2_0(s,i,a,val) genjmp2(s,i,a,JMPLINK_START,val)
static mrb_bool get_int_operand(codegen_scope *s, struct mrb_insn_data *data, mrb_int *ns);
static void gen_int(codegen_scope *s, uint16_t dst, mrb_int i);
static void
gen_move(codegen_scope *s, uint16_t dst, uint16_t src, int nopeep)
{
if (nopeep || no_peephole(s)) goto normal;
else if (dst == src) return;
else {
struct mrb_insn_data data = mrb_last_insn(s);
switch (data.insn) {
case OP_MOVE:
if (dst == src) return; /* remove useless MOVE */
if (data.b == dst && data.a == src) /* skip swapping MOVE */
return;
goto normal;
case OP_LOADNIL: case OP_LOADSELF: case OP_LOADT: case OP_LOADF:
case OP_LOADI__1:
case OP_LOADI_0: case OP_LOADI_1: case OP_LOADI_2: case OP_LOADI_3:
case OP_LOADI_4: case OP_LOADI_5: case OP_LOADI_6: case OP_LOADI_7:
if (data.a != src || data.a < s->nlocals) goto normal;
rewind_pc(s);
genop_1(s, data.insn, dst);
return;
case OP_HASH: case OP_ARRAY:
if (data.b != 0) goto normal;
/* fall through */
case OP_LOADI: case OP_LOADINEG:
case OP_LOADL: case OP_LOADSYM:
case OP_GETGV: case OP_GETSV: case OP_GETIV: case OP_GETCV:
case OP_GETCONST: case OP_STRING:
case OP_LAMBDA: case OP_BLOCK: case OP_METHOD: case OP_BLKPUSH:
if (data.a != src || data.a < s->nlocals) goto normal;
rewind_pc(s);
genop_2(s, data.insn, dst, data.b);
return;
case OP_LOADI16:
if (data.a != src || data.a < s->nlocals) goto normal;
rewind_pc(s);
genop_2S(s, data.insn, dst, data.b);
return;
case OP_LOADI32:
if (data.a != src || data.a < s->nlocals) goto normal;
else {
uint32_t i = (uint32_t)data.b<<16|data.c;
rewind_pc(s);
genop_2SS(s, data.insn, dst, i);
}
return;
case OP_AREF:
case OP_GETUPVAR:
if (data.a != src || data.a < s->nlocals) goto normal;
rewind_pc(s);
genop_3(s, data.insn, dst, data.b, data.c);
return;
case OP_ADDI: case OP_SUBI:
if (addr_pc(s, data.addr) == s->lastlabel || data.a != src || data.a < s->nlocals) goto normal;
else {
struct mrb_insn_data data0 = mrb_decode_insn(mrb_prev_pc(s, data.addr));
if (data0.insn != OP_MOVE || data0.a != data.a || data0.b != dst) goto normal;
s->pc = addr_pc(s, data0.addr);
if (addr_pc(s, data0.addr) != s->lastlabel) {
/* constant folding */
data0 = mrb_decode_insn(mrb_prev_pc(s, data0.addr));
mrb_int n;
if (data0.a == dst && get_int_operand(s, &data0, &n)) {
if ((data.insn == OP_ADDI && !mrb_int_add_overflow(n, data.b, &n)) ||
(data.insn == OP_SUBI && !mrb_int_sub_overflow(n, data.b, &n))) {
s->pc = addr_pc(s, data0.addr);
gen_int(s, dst, n);
return;
}
}
}
}
genop_2(s, data.insn, dst, data.b);
return;
default:
break;
}
}
normal:
genop_2(s, OP_MOVE, dst, src);
return;
}
static int search_upvar(codegen_scope *s, mrb_sym id, int *idx);
static void
gen_getupvar(codegen_scope *s, uint16_t dst, mrb_sym id)
{
int idx;
int lv = search_upvar(s, id, &idx);
if (!no_peephole(s)) {
struct mrb_insn_data data = mrb_last_insn(s);
if (data.insn == OP_SETUPVAR && data.a == dst && data.b == idx && data.c == lv) {
/* skip GETUPVAR right after SETUPVAR */
return;
}
}
genop_3(s, OP_GETUPVAR, dst, idx, lv);
}
static void
gen_setupvar(codegen_scope *s, uint16_t dst, mrb_sym id)
{
int idx;
int lv = search_upvar(s, id, &idx);
if (!no_peephole(s)) {
struct mrb_insn_data data = mrb_last_insn(s);
if (data.insn == OP_MOVE && data.a == dst) {
dst = data.b;
rewind_pc(s);
}
}
genop_3(s, OP_SETUPVAR, dst, idx, lv);
}
static void
gen_return(codegen_scope *s, uint8_t op, uint16_t src)
{
if (no_peephole(s)) {
genop_1(s, op, src);
}
else {
struct mrb_insn_data data = mrb_last_insn(s);
if (data.insn == OP_MOVE && src == data.a) {
rewind_pc(s);
genop_1(s, op, data.b);
}
else if (data.insn != OP_RETURN) {
genop_1(s, op, src);
}
}
}
static mrb_bool
get_int_operand(codegen_scope *s, struct mrb_insn_data *data, mrb_int *n)
{
switch (data->insn) {
case OP_LOADI__1:
*n = -1;
return TRUE;
case OP_LOADINEG:
*n = -data->b;
return TRUE;
case OP_LOADI_0: case OP_LOADI_1: case OP_LOADI_2: case OP_LOADI_3:
case OP_LOADI_4: case OP_LOADI_5: case OP_LOADI_6: case OP_LOADI_7:
*n = data->insn - OP_LOADI_0;
return TRUE;
case OP_LOADI:
case OP_LOADI16:
*n = (int16_t)data->b;
return TRUE;
case OP_LOADI32:
*n = (mrb_int)((uint32_t)data->b<<16)+data->c;
return TRUE;
case OP_LOADL:
{
mrb_pool_value *pv = &s->pool[data->b];
if (pv->tt == IREP_TT_INT32) {
*n = (mrb_int)pv->u.i32;
}
#ifdef MRB_INT64
else if (pv->tt == IREP_TT_INT64) {
*n = (mrb_int)pv->u.i64;
}
#endif
else {
return FALSE;
}
}
return TRUE;
default:
return FALSE;
}
}
static void
gen_addsub(codegen_scope *s, uint8_t op, uint16_t dst)
{
if (no_peephole(s)) {
normal:
genop_1(s, op, dst);
return;
}
else {
struct mrb_insn_data data = mrb_last_insn(s);
mrb_int n;
if (!get_int_operand(s, &data, &n)) {
/* not integer immediate */
goto normal;
}
struct mrb_insn_data data0 = mrb_decode_insn(mrb_prev_pc(s, data.addr));
mrb_int n0;
if (addr_pc(s, data.addr) == s->lastlabel || !get_int_operand(s, &data0, &n0)) {
/* OP_ADDI/OP_SUBI takes upto 8bits */
if (n > INT8_MAX || n < INT8_MIN) goto normal;
rewind_pc(s);
if (n == 0) return;
if (n > 0) {
if (op == OP_ADD) genop_2(s, OP_ADDI, dst, (uint16_t)n);
else genop_2(s, OP_SUBI, dst, (uint16_t)n);
}
else { /* n < 0 */
n = -n;
if (op == OP_ADD) genop_2(s, OP_SUBI, dst, (uint16_t)n);
else genop_2(s, OP_ADDI, dst, (uint16_t)n);
}
return;
}
if (op == OP_ADD) {
if (mrb_int_add_overflow(n0, n, &n)) goto normal;
}
else { /* OP_SUB */
if (mrb_int_sub_overflow(n0, n, &n)) goto normal;
}
s->pc = addr_pc(s, data0.addr);
gen_int(s, dst, n);
}
}
static void
gen_muldiv(codegen_scope *s, uint8_t op, uint16_t dst)
{
if (no_peephole(s)) {
normal:
genop_1(s, op, dst);
return;
}
else {
struct mrb_insn_data data = mrb_last_insn(s);
mrb_int n, n0;
if (addr_pc(s, data.addr) == s->lastlabel || !get_int_operand(s, &data, &n)) {
/* not integer immediate */
goto normal;
}
struct mrb_insn_data data0 = mrb_decode_insn(mrb_prev_pc(s, data.addr));
if (!get_int_operand(s, &data0, &n0) || n == 0) {
goto normal;
}
if (op == OP_MUL) {
if (mrb_int_mul_overflow(n0, n, &n)) goto normal;
}
else { /* OP_DIV */
if (n0 == MRB_INT_MIN && n == -1) goto normal;
n = n0 / n;
}
s->pc = addr_pc(s, data0.addr);
gen_int(s, dst, n);
}
}
mrb_bool mrb_num_shift(mrb_state *mrb, mrb_int val, mrb_int width, mrb_int *num);
static mrb_bool
gen_binop(codegen_scope *s, mrb_sym op, uint16_t dst)
{
if (no_peephole(s)) return FALSE;
else if (op == MRB_OPSYM_2(s->mrb, aref)) {
genop_1(s, OP_GETIDX, dst);
return TRUE;
}
else {
struct mrb_insn_data data = mrb_last_insn(s);
mrb_int n, n0;
if (addr_pc(s, data.addr) == s->lastlabel || !get_int_operand(s, &data, &n)) {
/* not integer immediate */
return FALSE;
}
struct mrb_insn_data data0 = mrb_decode_insn(mrb_prev_pc(s, data.addr));
if (!get_int_operand(s, &data0, &n0)) {
return FALSE;
}
if (op == MRB_OPSYM_2(s->mrb, lshift)) {
if (!mrb_num_shift(s->mrb, n0, n, &n)) return FALSE;
}
else if (op == MRB_OPSYM_2(s->mrb, rshift)) {
if (n == MRB_INT_MIN) return FALSE;
if (!mrb_num_shift(s->mrb, n0, -n, &n)) return FALSE;
}
else if (op == MRB_OPSYM_2(s->mrb, mod) && n != 0) {
if (n0 == MRB_INT_MIN && n == -1) {
n = 0;
}
else {
mrb_int n1 = n0 % n;
if ((n0 < 0) != (n < 0) && n1 != 0) {
n1 += n;
}
n = n1;
}
}
else if (op == MRB_OPSYM_2(s->mrb, and)) {
n = n0 & n;
}
else if (op == MRB_OPSYM_2(s->mrb, or)) {
n = n0 | n;
}
else if (op == MRB_OPSYM_2(s->mrb, xor)) {
n = n0 ^ n;
}
else {
return FALSE;
}
s->pc = addr_pc(s, data0.addr);
gen_int(s, dst, n);
return TRUE;
}
}
static uint32_t
dispatch(codegen_scope *s, uint32_t pos0)
{
int32_t pos1;
int32_t offset;
int16_t newpos;
if (pos0 == JMPLINK_START) return 0;
pos1 = pos0 + 2;
offset = s->pc - pos1;
if (offset > INT16_MAX) {
codegen_error(s, "too big jmp offset");
}
s->lastlabel = s->pc;
newpos = (int16_t)PEEK_S(s->iseq+pos0);
emit_S(s, pos0, (uint16_t)offset);
if (newpos == 0) return 0;
return pos1+newpos;
}
static void
dispatch_linked(codegen_scope *s, uint32_t pos)
{
if (pos==JMPLINK_START) return;
for (;;) {
pos = dispatch(s, pos);
if (pos==0) break;
}
}
#define nregs_update do {if (s->sp > s->nregs) s->nregs = s->sp;} while (0)
static void
push_n_(codegen_scope *s, int n)
{
if (s->sp+n >= 0xffff) {
codegen_error(s, "too complex expression");
}
s->sp+=n;
nregs_update;
}
static void
pop_n_(codegen_scope *s, int n)
{
if ((int)s->sp-n < 0) {
codegen_error(s, "stack pointer underflow");
}
s->sp-=n;
}
#define push() push_n_(s,1)
#define push_n(n) push_n_(s,n)
#define pop() pop_n_(s,1)
#define pop_n(n) pop_n_(s,n)
#define cursp() (s->sp)
static int
new_litbn(codegen_scope *s, const char *p, int base, mrb_bool neg)
{
int i;
size_t plen;
mrb_pool_value *pv;
plen = strlen(p);
if (plen > 255) {
codegen_error(s, "integer too big");
}
for (i=0; i<s->irep->plen; i++) {
size_t len;
pv = &s->pool[i];
if (pv->tt != IREP_TT_BIGINT) continue;
len = pv->u.str[0];
if (len == plen && pv->u.str[1] == base && memcmp(pv->u.str+2, p, len) == 0)
return i;
}
if (s->irep->plen == s->pcapa) {
s->pcapa *= 2;
s->pool = (mrb_pool_value*)codegen_realloc(s, s->pool, sizeof(mrb_pool_value)*s->pcapa);
}
pv = &s->pool[s->irep->plen];
i = s->irep->plen++;
{
char *buf;
pv->tt = IREP_TT_BIGINT;
buf = (char*)codegen_realloc(s, NULL, plen+3);
buf[0] = (char)plen;
buf[1] = base;
if (neg) buf[1] = 0x80;
memcpy(buf+2, p, plen);
buf[plen+2] = '\0';
pv->u.str = buf;
}
return i;
}
static int
new_lit(codegen_scope *s, mrb_value val)
{
int i;
mrb_pool_value *pv;
switch (mrb_type(val)) {
case MRB_TT_STRING:
for (i=0; i<s->irep->plen; i++) {
mrb_int len;
pv = &s->pool[i];
if (pv->tt & IREP_TT_NFLAG) continue;
len = pv->tt>>2;
if (RSTRING_LEN(val) != len) continue;
if (memcmp(pv->u.str, RSTRING_PTR(val), len) == 0)
return i;
}
break;
#ifndef MRB_NO_FLOAT
case MRB_TT_FLOAT:
for (i=0; i<s->irep->plen; i++) {
mrb_float f1, f2;
pv = &s->pool[i];
if (pv->tt != IREP_TT_FLOAT) continue;
pv = &s->pool[i];
f1 = pv->u.f;
f2 = mrb_float(val);
if (f1 == f2 && !signbit(f1) == !signbit(f2)) return i;
}
break;
#endif
case MRB_TT_INTEGER:
for (i=0; i<s->irep->plen; i++) {
mrb_int v = mrb_integer(val);
pv = &s->pool[i];
if (pv->tt == IREP_TT_INT32) {
if (v == pv->u.i32) return i;
}
#ifdef MRB_64BIT
else if (pv->tt == IREP_TT_INT64) {
if (v == pv->u.i64) return i;
}
continue;
#endif
}
break;
default:
/* should not happen */
return 0;
}
if (s->irep->plen == s->pcapa) {
s->pcapa *= 2;
s->pool = (mrb_pool_value*)codegen_realloc(s, s->pool, sizeof(mrb_pool_value)*s->pcapa);
}
pv = &s->pool[s->irep->plen];
i = s->irep->plen++;
switch (mrb_type(val)) {
case MRB_TT_STRING:
if (RSTR_NOFREE_P(RSTRING(val))) {
pv->tt = (uint32_t)(RSTRING_LEN(val)<<2) | IREP_TT_SSTR;
pv->u.str = RSTRING_PTR(val);
}
else {
char *p;
mrb_int len = RSTRING_LEN(val);
pv->tt = (uint32_t)(len<<2) | IREP_TT_STR;
p = (char*)codegen_realloc(s, NULL, len+1);
memcpy(p, RSTRING_PTR(val), len);
p[len] = '\0';
pv->u.str = p;
}
break;
#ifndef MRB_NO_FLOAT
case MRB_TT_FLOAT:
pv->tt = IREP_TT_FLOAT;
pv->u.f = mrb_float(val);
break;
#endif
case MRB_TT_INTEGER:
#ifdef MRB_INT64
pv->tt = IREP_TT_INT64;
pv->u.i64 = mrb_integer(val);
#else
pv->tt = IREP_TT_INT32;
pv->u.i32 = mrb_integer(val);
#endif
break;
default:
/* should not happen */
break;
}
return i;
}
static int
new_sym(codegen_scope *s, mrb_sym sym)
{
int i, len;
mrb_assert(s->irep);
len = s->irep->slen;
for (i=0; i<len; i++) {
if (s->syms[i] == sym) return i;
}
if (s->irep->slen >= s->scapa) {
s->scapa *= 2;
if (s->scapa > 0xffff) {
codegen_error(s, "too many symbols");
}
s->syms = (mrb_sym*)codegen_realloc(s, s->syms, sizeof(mrb_sym)*s->scapa);
}
s->syms[s->irep->slen] = sym;
return s->irep->slen++;
}
static void
gen_setxv(codegen_scope *s, uint8_t op, uint16_t dst, mrb_sym sym, int val)
{
int idx = new_sym(s, sym);
if (!val && !no_peephole(s)) {
struct mrb_insn_data data = mrb_last_insn(s);
if (data.insn == OP_MOVE && data.a == dst) {
dst = data.b;
rewind_pc(s);
}
}
genop_2(s, op, dst, idx);
}
static void
gen_int(codegen_scope *s, uint16_t dst, mrb_int i)
{
if (i < 0) {
if (i == -1) genop_1(s, OP_LOADI__1, dst);
else if (i >= -0xff) genop_2(s, OP_LOADINEG, dst, (uint16_t)-i);
else if (i >= INT16_MIN) genop_2S(s, OP_LOADI16, dst, (uint16_t)i);
else if (i >= INT32_MIN) genop_2SS(s, OP_LOADI32, dst, (uint32_t)i);
else goto int_lit;
}
else if (i < 8) genop_1(s, OP_LOADI_0 + (uint8_t)i, dst);
else if (i <= 0xff) genop_2(s, OP_LOADI, dst, (uint16_t)i);
else if (i <= INT16_MAX) genop_2S(s, OP_LOADI16, dst, (uint16_t)i);
else if (i <= INT32_MAX) genop_2SS(s, OP_LOADI32, dst, (uint32_t)i);
else {
int_lit:
genop_2(s, OP_LOADL, dst, new_lit(s, mrb_int_value(s->mrb, i)));
}
}
static mrb_bool
gen_uniop(codegen_scope *s, mrb_sym sym, uint16_t dst)
{
if (no_peephole(s)) return FALSE;
struct mrb_insn_data data = mrb_last_insn(s);
mrb_int n;
if (!get_int_operand(s, &data, &n)) return FALSE;
if (sym == MRB_OPSYM_2(s->mrb, plus)) {
/* unary plus does nothing */
}
else if (sym == MRB_OPSYM_2(s->mrb, minus)) {
if (n == MRB_INT_MIN) return FALSE;
n = -n;
}
else if (sym == MRB_OPSYM_2(s->mrb, neg)) {
n = ~n;
}
else {
return FALSE;
}
s->pc = addr_pc(s, data.addr);
gen_int(s, dst, n);
return TRUE;
}
static int
node_len(node *tree)
{
int n = 0;
while (tree) {
n++;
tree = tree->cdr;
}
return n;
}
#define nint(x) ((int)(intptr_t)(x))
#define nchar(x) ((char)(intptr_t)(x))
#define nsym(x) ((mrb_sym)(intptr_t)(x))
#define lv_name(lv) nsym((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;
}
static int
search_upvar(codegen_scope *s, mrb_sym id, int *idx)
{
const struct RProc *u;
int lv = 0;
codegen_scope *up = s->prev;
while (up) {
*idx = lv_idx(up, id);
if (*idx > 0) {
return lv;
}
lv ++;
up = up->prev;
}
if (lv < 1) lv = 1;
u = s->parser->upper;
while (u && !MRB_PROC_CFUNC_P(u)) {
const struct mrb_irep *ir = u->body.irep;
uint_fast16_t n = ir->nlocals;
int i;
const mrb_sym *v = ir->lv;
if (v) {
for (i=1; n > 1; n--, v++, i++) {
if (*v == id) {
*idx = i;
return lv - 1;
}
}
}
if (MRB_PROC_SCOPE_P(u)) break;
u = u->upper;
lv ++;
}
codegen_error(s, "Can't found local variables");
return -1; /* not reached */
}
static void
for_body(codegen_scope *s, node *tree)
{
codegen_scope *prev = s;
int idx;
struct loopinfo *lp;
node *n2;
/* generate receiver */
codegen(s, tree->cdr->car, VAL);
/* generate loop-block */
s = scope_new(s->mrb, s, NULL);
push(); /* push for a block parameter */
/* generate loop variable */
n2 = tree->car;
genop_W(s, OP_ENTER, 0x40000);
if (n2->car && !n2->car->cdr && !n2->cdr) {
gen_assignment(s, n2->car->car, NULL, 1, NOVAL);
}
else {
gen_vmassignment(s, n2, 1, VAL);
}
/* construct loop */
lp = loop_push(s, LOOP_FOR);
lp->pc1 = new_label(s);
/* loop body */
codegen(s, tree->cdr->cdr->car, VAL);
pop();
gen_return(s, OP_RETURN, cursp());
loop_pop(s, NOVAL);
scope_finish(s);
s = prev;
genop_2(s, OP_BLOCK, cursp(), s->irep->rlen-1);
push();pop(); /* space for a block */
pop();
idx = new_sym(s, MRB_SYM_2(s->mrb, each));
genop_3(s, OP_SENDB, cursp(), idx, 0);
}
static int
lambda_body(codegen_scope *s, node *tree, int blk)
{
codegen_scope *parent = s;
s = scope_new(s->mrb, s, tree->car);
s->mscope = !blk;
if (blk) {
struct loopinfo *lp = loop_push(s, LOOP_BLOCK);
lp->pc0 = new_label(s);
}
tree = tree->cdr;
if (tree->car == NULL) {
genop_W(s, OP_ENTER, 0);
s->ainfo = 0;
}
else {
mrb_aspec a;
int ma, oa, ra, pa, ka, kd, ba, i;
uint32_t pos;
node *opt;
node *margs, *pargs;
node *tail;
/* mandatory arguments */
ma = node_len(tree->car->car);
margs = tree->car->car;
tail = tree->car->cdr->cdr->cdr->cdr;
/* optional arguments */
oa = node_len(tree->car->cdr->car);
/* rest argument? */
ra = tree->car->cdr->cdr->car ? 1 : 0;
/* mandatory arguments after rest argument */
pa = node_len(tree->car->cdr->cdr->cdr->car);
pargs = tree->car->cdr->cdr->cdr->car;
/* keyword arguments */
ka = tail? node_len(tail->cdr->car) : 0;
/* keyword dictionary? */
kd = tail && tail->cdr->cdr->car? 1 : 0;
/* block argument? */
ba = tail && tail->cdr->cdr->cdr->car ? 1 : 0;
if (ma > 0x1f || oa > 0x1f || pa > 0x1f || ka > 0x1f) {
codegen_error(s, "too many formal arguments");
}
/* (23bits = 5:5:1:5:5:1:1) */
a = MRB_ARGS_REQ(ma)
| MRB_ARGS_OPT(oa)
| (ra? MRB_ARGS_REST() : 0)
| MRB_ARGS_POST(pa)
| MRB_ARGS_KEY(ka, kd)
| (ba? MRB_ARGS_BLOCK() : 0);
genop_W(s, OP_ENTER, a);
/* (12bits = 5:1:5:1) */
s->ainfo = (((ma+oa) & 0x3f) << 7)
| ((ra & 0x1) << 6)
| ((pa & 0x1f) << 1)
| ((ka | kd) ? 1 : 0);
/* generate jump table for optional arguments initializer */
pos = new_label(s);
for (i=0; i<oa; i++) {
new_label(s);
genjmp_0(s, OP_JMP);
}
if (oa > 0) {
genjmp_0(s, OP_JMP);
}
opt = tree->car->cdr->car;
i = 0;
while (opt) {
int idx;
mrb_sym id = nsym(opt->car->car);
dispatch(s, pos+i*3+1);
codegen(s, opt->car->cdr, VAL);
pop();
idx = lv_idx(s, id);
if (idx > 0) {
gen_move(s, idx, cursp(), 0);
}
else {
gen_getupvar(s, cursp(), id);
}
i++;
opt = opt->cdr;
}
if (oa > 0) {
dispatch(s, pos+i*3+1);
}
/* keyword arguments */
if (tail) {
node *kwds = tail->cdr->car;
int kwrest = 0;
if (tail->cdr->cdr->car) {
kwrest = 1;
}
mrb_assert(nint(tail->car) == NODE_ARGS_TAIL);
mrb_assert(node_len(tail) == 4);
while (kwds) {
int jmpif_key_p, jmp_def_set = -1;
node *kwd = kwds->car, *def_arg = kwd->cdr->cdr->car;
mrb_sym kwd_sym = nsym(kwd->cdr->car);
mrb_assert(nint(kwd->car) == NODE_KW_ARG);
if (def_arg) {
int idx;
genop_2(s, OP_KEY_P, lv_idx(s, kwd_sym), new_sym(s, kwd_sym));
jmpif_key_p = genjmp2_0(s, OP_JMPIF, lv_idx(s, kwd_sym), NOVAL);
codegen(s, def_arg, VAL);
pop();
idx = lv_idx(s, kwd_sym);
if (idx > 0) {
gen_move(s, idx, cursp(), 0);
}
else {
gen_getupvar(s, cursp(), kwd_sym);
}
jmp_def_set = genjmp_0(s, OP_JMP);
dispatch(s, jmpif_key_p);
}
genop_2(s, OP_KARG, lv_idx(s, kwd_sym), new_sym(s, kwd_sym));
if (jmp_def_set != -1) {
dispatch(s, jmp_def_set);
}
i++;
kwds = kwds->cdr;
}
if (tail->cdr->car && !kwrest) {
genop_0(s, OP_KEYEND);
}
}
/* argument destructuring */
if (margs) {
node *n = margs;
pos = 1;
while (n) {
if (nint(n->car->car) == NODE_MASGN) {
gen_vmassignment(s, n->car->cdr->car, pos, NOVAL);
}
pos++;
n = n->cdr;
}
}
if (pargs) {
node *n = pargs;
pos = ma+oa+ra+1;
while (n) {
if (nint(n->car->car) == NODE_MASGN) {
gen_vmassignment(s, n->car->cdr->car, pos, NOVAL);
}
pos++;
n = n->cdr;
}
}
}
codegen(s, tree->cdr->car, VAL);
pop();
if (s->pc > 0) {
gen_return(s, OP_RETURN, cursp());
}
if (blk) {
loop_pop(s, NOVAL);
}
scope_finish(s);
return parent->irep->rlen - 1;
}
static int
scope_body(codegen_scope *s, node *tree, int val)
{
codegen_scope *scope = scope_new(s->mrb, s, tree->car);
codegen(scope, tree->cdr, VAL);
gen_return(scope, OP_RETURN, scope->sp-1);
if (!s->iseq) {
genop_0(scope, OP_STOP);
}
scope_finish(scope);
if (!s->irep) {
/* should not happen */
return 0;
}
return s->irep->rlen - 1;
}
static mrb_bool
nosplat(node *t)
{
while (t) {
if (nint(t->car->car) == NODE_SPLAT) return FALSE;
t = t->cdr;
}
return TRUE;
}
static mrb_sym
attrsym(codegen_scope *s, mrb_sym a)
{
const char *name;
mrb_int len;
char *name2;
name = mrb_sym_name_len(s->mrb, a, &len);
name2 = (char *)codegen_palloc(s,
(size_t)len
+ 1 /* '=' */
+ 1 /* '\0' */
);
mrb_assert_int_fit(mrb_int, len, size_t, SIZE_MAX);
memcpy(name2, name, (size_t)len);
name2[len] = '=';
name2[len+1] = '\0';
return mrb_intern(s->mrb, name2, len+1);
}
#define CALL_MAXARGS 15
#define GEN_LIT_ARY_MAX 64
#define GEN_VAL_STACK_MAX 99
static int
gen_values(codegen_scope *s, node *t, int val, int extra, int limit)
{
int n = 0;
int first = 1;
int slimit = GEN_VAL_STACK_MAX;
if (limit == 0) limit = GEN_LIT_ARY_MAX;
if (cursp() >= slimit) slimit = INT16_MAX;
if (!val) {
while (t) {
codegen(s, t->car, NOVAL);
n++;
t = t->cdr;
}
return n;
}
while (t) {
int is_splat = nint(t->car->car) == NODE_SPLAT;
if (is_splat || n+extra >= limit-1 || cursp() >= slimit) { /* flush stack */
pop_n(n);
if (first) {
if (n == 0) {
genop_1(s, OP_LOADNIL, cursp());
}
else {
genop_2(s, OP_ARRAY, cursp(), n);
}
push();
first = 0;
limit = GEN_LIT_ARY_MAX;
}
else if (n > 0) {
pop();
genop_2(s, OP_ARYPUSH, cursp(), n);
push();
}
n = 0;
}
codegen(s, t->car, val);
if (is_splat) {
pop(); pop();
genop_1(s, OP_ARYCAT, cursp());
push();
}
else {
n++;
}
t = t->cdr;
}
if (!first) {
pop();
if (n > 0) {
pop_n(n);
genop_2(s, OP_ARYPUSH, cursp(), n);
}
return -1; /* variable length */
}
return n;
}
static int
gen_hash(codegen_scope *s, node *tree, int val, int limit)
{
int slimit = GEN_VAL_STACK_MAX;
if (cursp() >= GEN_LIT_ARY_MAX) slimit = INT16_MAX;
int len = 0;
mrb_bool update = FALSE;
while (tree) {
if (nint(tree->car->car->car) == NODE_KW_REST_ARGS) {
if (len > 0) {
pop_n(len*2);
if (!update) {
genop_2(s, OP_HASH, cursp(), len);
}
else {
pop();
genop_2(s, OP_HASHADD, cursp(), len);
}
push();
}
codegen(s, tree->car->cdr, val);
if (len > 0 || update) {
pop(); pop();
genop_1(s, OP_HASHCAT, cursp());
push();
}
update = TRUE;
len = 0;
}
else {
codegen(s, tree->car->car, val);
codegen(s, tree->car->cdr, val);
len++;
}
tree = tree->cdr;
if (val && cursp() >= slimit) {
pop_n(len*2);
if (!update) {
genop_2(s, OP_HASH, cursp(), len);
}
else {
pop();
genop_2(s, OP_HASHADD, cursp(), len);
}
push();
update = TRUE;
len = 0;
}
}
if (update) {
if (len > 0) {
pop_n(len*2+1);
genop_2(s, OP_HASHADD, cursp(), len);
push();
}
return -1; /* variable length */
}
if (update) return -1;
return len;
}
static void
gen_call(codegen_scope *s, node *tree, mrb_sym name, int sp, int val, int safe)
{
mrb_sym sym = name ? name : nsym(tree->cdr->car);
int skip = 0, n = 0, nk = 0, noop = 0, noself = 0, blk = 0, sp_save = cursp();
if (!tree->car) {
noself = noop = 1;
push();
}
else {
codegen(s, tree->car, VAL); /* receiver */
}
if (safe) {
int recv = cursp()-1;
gen_move(s, cursp(), recv, 1);
skip = genjmp2_0(s, OP_JMPNIL, cursp(), val);
}
tree = tree->cdr->cdr->car;
if (tree) {
if (tree->car) { /* positional arguments */
n = gen_values(s, tree->car, VAL, sp?1:0, 14);
if (n < 0) { /* variable length */
noop = 1; /* not operator */
n = 15;
push();
}
}
if (tree->cdr->car) { /* keyword arguments */
noop = 1;
nk = gen_hash(s, tree->cdr->car->cdr, VAL, 14);
if (nk < 0) nk = 15;
}
}
if (sp) { /* last argument pushed (attr=, []=) */
/* pack keyword arguments */
if (nk > 0 && nk < 15) {
pop_n(nk*2);
genop_2(s, OP_HASH, cursp(), nk);
push();
}
if (n == CALL_MAXARGS) {
if (nk > 0) {
pop(); pop();
genop_2(s, OP_ARYPUSH, cursp(), 1);
push();
}
gen_move(s, cursp(), sp, 0);
pop();
genop_2(s, OP_ARYPUSH, cursp(), 1);
push();
}
else {
gen_move(s, cursp(), sp, 0);
push();
if (nk > 0) n++;
n++;
}
nk = 0;
}
if (tree && tree->cdr && tree->cdr->cdr) {
codegen(s, tree->cdr->cdr, VAL);
pop();
noop = 1;
blk = 1;
}
push();pop();
s->sp = sp_save;
if (!noop && sym == MRB_OPSYM_2(s->mrb, add) && n == 1) {
gen_addsub(s, OP_ADD, cursp());
}
else if (!noop && sym == MRB_OPSYM_2(s->mrb, sub) && n == 1) {
gen_addsub(s, OP_SUB, cursp());
}
else if (!noop && sym == MRB_OPSYM_2(s->mrb, mul) && n == 1) {
gen_muldiv(s, OP_MUL, cursp());
}
else if (!noop && sym == MRB_OPSYM_2(s->mrb, div) && n == 1) {
gen_muldiv(s, OP_DIV, cursp());
}
else if (!noop && sym == MRB_OPSYM_2(s->mrb, lt) && n == 1) {
genop_1(s, OP_LT, cursp());
}
else if (!noop && sym == MRB_OPSYM_2(s->mrb, le) && n == 1) {
genop_1(s, OP_LE, cursp());
}
else if (!noop && sym == MRB_OPSYM_2(s->mrb, gt) && n == 1) {
genop_1(s, OP_GT, cursp());
}
else if (!noop && sym == MRB_OPSYM_2(s->mrb, ge) && n == 1) {
genop_1(s, OP_GE, cursp());
}
else if (!noop && sym == MRB_OPSYM_2(s->mrb, eq) && n == 1) {
genop_1(s, OP_EQ, cursp());
}
else if (!noop && sym == MRB_OPSYM_2(s->mrb, aset) && n == 2) {
genop_1(s, OP_SETIDX, cursp());
}
else if (!noop && n == 0 && gen_uniop(s, sym, cursp())) {
/* constant folding succeeded */
}
else if (!noop && n == 1 && gen_binop(s, sym, cursp())) {
/* constant folding succeeded */
}
else if (noself){
genop_3(s, blk ? OP_SSENDB : OP_SSEND, cursp(), new_sym(s, sym), n|(nk<<4));
}
else {
genop_3(s, blk ? OP_SENDB : OP_SEND, cursp(), new_sym(s, sym), n|(nk<<4));
}
if (safe) {
dispatch(s, skip);
}
if (val) {
push();
}
}
static void
gen_assignment(codegen_scope *s, node *tree, node *rhs, int sp, int val)
{
int idx;
int type = nint(tree->car);
switch (type) {
case NODE_GVAR:
case NODE_ARG:
case NODE_LVAR:
case NODE_IVAR:
case NODE_CVAR:
case NODE_CONST:
case NODE_NIL:
case NODE_MASGN:
if (rhs) {
codegen(s, rhs, VAL);
pop();
sp = cursp();
}
break;
case NODE_COLON2:
case NODE_CALL:
case NODE_SCALL:
/* keep evaluation order */
break;
case NODE_NVAR:
codegen_error(s, "Can't assign to numbered parameter");
break;
default:
codegen_error(s, "unknown lhs");
break;
}
tree = tree->cdr;
switch (type) {
case NODE_GVAR:
gen_setxv(s, OP_SETGV, sp, nsym(tree), val);
break;
case NODE_ARG:
case NODE_LVAR:
idx = lv_idx(s, nsym(tree));
if (idx > 0) {
if (idx != sp) {
gen_move(s, idx, sp, val);
}
break;
}
else { /* upvar */
gen_setupvar(s, sp, nsym(tree));
}
break;
case NODE_IVAR:
gen_setxv(s, OP_SETIV, sp, nsym(tree), val);
break;
case NODE_CVAR:
gen_setxv(s, OP_SETCV, sp, nsym(tree), val);
break;
case NODE_CONST:
gen_setxv(s, OP_SETCONST, sp, nsym(tree), val);
break;
case NODE_COLON2:
if (sp) {
gen_move(s, cursp(), sp, 0);
}
sp = cursp();
push();
codegen(s, tree->car, VAL);
if (rhs) {
codegen(s, rhs, VAL); pop();
gen_move(s, sp, cursp(), 0);
}
pop_n(2);
idx = new_sym(s, nsym(tree->cdr));
genop_2(s, OP_SETMCNST, sp, idx);
break;
case NODE_CALL:
case NODE_SCALL:
{
int noself = 0, safe = (type == NODE_SCALL), skip = 0, top, call, n = 0;
mrb_sym mid = nsym(tree->cdr->car);
top = cursp();
if (val || sp == cursp()) {
push(); /* room for retval */
}
call = cursp();
if (!tree->car) {
noself = 1;
push();
}
else {
codegen(s, tree->car, VAL); /* receiver */
}
if (safe) {
int recv = cursp()-1;
gen_move(s, cursp(), recv, 1);
skip = genjmp2_0(s, OP_JMPNIL, cursp(), val);
}
tree = tree->cdr->cdr->car;
if (tree) {
if (tree->car) { /* positional arguments */
n = gen_values(s, tree->car, VAL, 0, (tree->cdr->car)?13:14);
if (n < 0) { /* variable length */
n = 15;
push();
}
}
if (tree->cdr->car) { /* keyword arguments */
gen_hash(s, tree->cdr->car->cdr, VAL, 0);
if (n < 14) {
n++;
push();
}
else {
pop();
genop_2(s, OP_ARYPUSH, cursp(), 1);
}
}
}
if (rhs) {
codegen(s, rhs, VAL);
pop();
}
else {
gen_move(s, cursp(), sp, 0);
}
if (val) {
gen_move(s, top, cursp(), 1);
}
if (n < 14) {
n++;
}
else {
pop();
genop_2(s, OP_ARYPUSH, cursp(), 1);
}
s->sp = call;
genop_3(s, noself ? OP_SSEND : OP_SEND, cursp(), new_sym(s, attrsym(s, mid)), n);
if (safe) {
dispatch(s, skip);
}
s->sp = top;
}
break;
case NODE_MASGN:
gen_vmassignment(s, tree->car, sp, val);
break;
/* splat without assignment */
case NODE_NIL:
break;
default:
codegen_error(s, "unknown lhs");
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) {
int sp = cursp();
genop_3(s, OP_AREF, sp, rhs, n);
push();
gen_assignment(s, t->car, NULL, sp, NOVAL);
pop();
n++;
t = t->cdr;
}
}
t = tree->cdr;
if (t) {
if (t->cdr) { /* post count */
p = t->cdr->car;
while (p) {
post++;
p = p->cdr;
}
}
gen_move(s, cursp(), rhs, val);
push_n(post+1);
pop_n(post+1);
genop_3(s, OP_APOST, cursp(), n, post);
n = 1;
if (t->car && t->car != (node*)-1) { /* rest */
gen_assignment(s, t->car, NULL, cursp(), NOVAL);
}
if (t->cdr && t->cdr->car) {
t = t->cdr->car;
while (t) {
gen_assignment(s, t->car, NULL, cursp()+n, NOVAL);
t = t->cdr;
n++;
}
}
if (val) {
gen_move(s, cursp(), rhs, 0);
}
}
}
static void
gen_intern(codegen_scope *s)
{
pop();
if (!no_peephole(s)) {
struct mrb_insn_data data = mrb_last_insn(s);
if (data.insn == OP_STRING && data.a == cursp()) {
rewind_pc(s);
genop_2(s, OP_SYMBOL, data.a, data.b);
push();
return;
}
}
genop_1(s, OP_INTERN, cursp());
push();
}
static void
gen_literal_array(codegen_scope *s, node *tree, mrb_bool sym, int val)
{
if (val) {
int i = 0, j = 0, gen = 0;
while (tree) {
switch (nint(tree->car->car)) {
case NODE_STR:
if ((tree->cdr == NULL) && (nint(tree->car->cdr->cdr) == 0))
break;
/* fall through */
case NODE_BEGIN:
codegen(s, tree->car, VAL);
++j;
break;
case NODE_LITERAL_DELIM:
if (j > 0) {
j = 0;
++i;
if (sym)
gen_intern(s);
}
break;
}
while (j >= 2) {
pop(); pop();
genop_1(s, OP_STRCAT, cursp());
push();
j--;
}
if (i > GEN_LIT_ARY_MAX) {
pop_n(i);
if (gen) {
pop();
genop_2(s, OP_ARYPUSH, cursp(), i);
}
else {
genop_2(s, OP_ARRAY, cursp(), i);
gen = 1;
}
push();
i = 0;
}
tree = tree->cdr;
}
if (j > 0) {
++i;
if (sym)
gen_intern(s);
}
pop_n(i);
if (gen) {
pop();
genop_2(s, OP_ARYPUSH, cursp(), i);
}
else {
genop_2(s, OP_ARRAY, cursp(), i);
}
push();
}
else {
while (tree) {
switch (nint(tree->car->car)) {
case NODE_BEGIN: case NODE_BLOCK:
codegen(s, tree->car, NOVAL);
}
tree = tree->cdr;
}
}
}
static void
raise_error(codegen_scope *s, const char *msg)
{
int idx = new_lit(s, mrb_str_new_cstr(s->mrb, msg));
genop_1(s, OP_ERR, idx);
}
static mrb_int
readint(codegen_scope *s, const char *p, int base, mrb_bool neg, mrb_bool *overflow)
{
const char *e = p + strlen(p);
mrb_int result = 0;
mrb_assert(base >= 2 && base <= 16);
if (*p == '+') p++;
while (p < e) {
int n;
char c = *p;
switch (c) {
case '0': case '1': case '2': case '3':
case '4': case '5': case '6': case '7':
n = c - '0'; break;
case '8': case '9':
n = c - '0'; break;
case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
n = c - 'a' + 10; break;
case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
n = c - 'A' + 10; break;
default:
codegen_error(s, "malformed readint input");
*overflow = TRUE;
/* not reached */
return result;
}
if (mrb_int_mul_overflow(result, base, &result)) {
overflow:
*overflow = TRUE;
return 0;
}
mrb_uint tmp = ((mrb_uint)result)+n;
if (neg && tmp == (mrb_uint)MRB_INT_MAX+1) {
*overflow = FALSE;
return MRB_INT_MIN;
}
if (tmp > MRB_INT_MAX) goto overflow;
result = (mrb_int)tmp;
p++;
}
*overflow = FALSE;
if (neg) return -result;
return result;
}
static void
gen_retval(codegen_scope *s, node *tree)
{
if (nint(tree->car) == NODE_SPLAT) {
codegen(s, tree, VAL);
pop();
genop_1(s, OP_ARYDUP, cursp());
}
else {
codegen(s, tree, VAL);
pop();
}
}
static mrb_bool
true_always(node *tree)
{
switch (nint(tree->car)) {
case NODE_TRUE:
case NODE_INT:
case NODE_STR:
case NODE_SYM:
return TRUE;
default:
return FALSE;
}
}
static mrb_bool
false_always(node *tree)
{
switch (nint(tree->car)) {
case NODE_FALSE:
case NODE_NIL:
return TRUE;
default:
return FALSE;
}
}
static void
gen_blkmove(codegen_scope *s, uint16_t ainfo, int lv)
{
int m1 = (ainfo>>7)&0x3f;
int r = (ainfo>>6)&0x1;
int m2 = (ainfo>>1)&0x1f;
int kd = (ainfo)&0x1;
int off = m1+r+m2+kd+1;
if (lv == 0) {
gen_move(s, cursp(), off, 0);
}
else {
genop_3(s, OP_GETUPVAR, cursp(), off, lv);
}
push();
}
static void
codegen(codegen_scope *s, node *tree, int val)
{
int nt;
int rlev = s->rlev;
if (!tree) {
if (val) {
genop_1(s, OP_LOADNIL, cursp());
push();
}
return;
}
s->rlev++;
if (s->rlev > MRB_CODEGEN_LEVEL_MAX) {
codegen_error(s, "too complex expression");
}
if (s->irep && s->filename_index != tree->filename_index) {
mrb_sym fname = mrb_parser_get_filename(s->parser, s->filename_index);
const char *filename = mrb_sym_name_len(s->mrb, fname, NULL);
mrb_debug_info_append_file(s->mrb, s->irep->debug_info,
filename, s->lines, s->debug_start_pos, s->pc);
s->debug_start_pos = s->pc;
s->filename_index = tree->filename_index;
s->filename_sym = mrb_parser_get_filename(s->parser, tree->filename_index);
}
nt = nint(tree->car);
s->lineno = tree->lineno;
tree = tree->cdr;
switch (nt) {
case NODE_BEGIN:
if (val && !tree) {
genop_1(s, OP_LOADNIL, cursp());
push();
}
while (tree) {
codegen(s, tree->car, tree->cdr ? NOVAL : val);
tree = tree->cdr;
}
break;
case NODE_RESCUE:
{
int noexc;
uint32_t exend, pos1, pos2, tmp;
struct loopinfo *lp;
int catch_entry, begin, end;
if (tree->car == NULL) goto exit;
lp = loop_push(s, LOOP_BEGIN);
lp->pc0 = new_label(s);
catch_entry = catch_handler_new(s);
begin = s->pc;
codegen(s, tree->car, VAL);
pop();
lp->type = LOOP_RESCUE;
end = s->pc;
noexc = genjmp_0(s, OP_JMP);
catch_handler_set(s, catch_entry, MRB_CATCH_RESCUE, begin, end, s->pc);
tree = tree->cdr;
exend = JMPLINK_START;
pos1 = JMPLINK_START;
if (tree->car) {
node *n2 = tree->car;
int exc = cursp();
genop_1(s, OP_EXCEPT, exc);
push();
while (n2) {
node *n3 = n2->car;
node *n4 = n3->car;
dispatch(s, pos1);
pos2 = JMPLINK_START;
do {
if (n4 && n4->car && nint(n4->car->car) == NODE_SPLAT) {
codegen(s, n4->car, VAL);
gen_move(s, cursp(), exc, 0);
push_n(2); pop_n(2); /* space for one arg and a block */
pop();
genop_3(s, OP_SEND, cursp(), new_sym(s, MRB_SYM_2(s->mrb, __case_eqq)), 1);
}
else {
if (n4) {
codegen(s, n4->car, VAL);
}
else {
genop_2(s, OP_GETCONST, cursp(), new_sym(s, MRB_SYM_2(s->mrb, StandardError)));
push();
}
pop();
genop_2(s, OP_RESCUE, exc, cursp());
}
tmp = genjmp2(s, OP_JMPIF, cursp(), pos2, val);
pos2 = tmp;
if (n4) {
n4 = n4->cdr;
}
} while (n4);
pos1 = genjmp_0(s, OP_JMP);
dispatch_linked(s, pos2);
pop();
if (n3->cdr->car) {
gen_assignment(s, n3->cdr->car, NULL, exc, NOVAL);
}
if (n3->cdr->cdr->car) {
codegen(s, n3->cdr->cdr->car, val);
if (val) pop();
}
tmp = genjmp(s, OP_JMP, exend);
exend = tmp;
n2 = n2->cdr;
push();
}
if (pos1 != JMPLINK_START) {
dispatch(s, pos1);
genop_1(s, OP_RAISEIF, exc);
}
}
pop();
tree = tree->cdr;
dispatch(s, noexc);
if (tree->car) {
codegen(s, tree->car, val);
}
else if (val) {
push();
}
dispatch_linked(s, exend);
loop_pop(s, NOVAL);
}
break;
case NODE_ENSURE:
if (!tree->cdr || !tree->cdr->cdr ||
(nint(tree->cdr->cdr->car) == NODE_BEGIN &&
tree->cdr->cdr->cdr)) {
int catch_entry, begin, end, target;
int idx;
catch_entry = catch_handler_new(s);
begin = s->pc;
codegen(s, tree->car, val);
end = target = s->pc;
push();
idx = cursp();
genop_1(s, OP_EXCEPT, idx);
push();
codegen(s, tree->cdr->cdr, NOVAL);
pop();
genop_1(s, OP_RAISEIF, idx);
pop();
catch_handler_set(s, catch_entry, MRB_CATCH_ENSURE, begin, end, target);
}
else { /* empty ensure ignored */
codegen(s, tree->car, val);
}
break;
case NODE_LAMBDA:
if (val) {
int idx = lambda_body(s, tree, 1);
genop_2(s, OP_LAMBDA, cursp(), idx);
push();
}
break;
case NODE_BLOCK:
if (val) {
int idx = lambda_body(s, tree, 1);
genop_2(s, OP_BLOCK, cursp(), idx);
push();
}
break;
case NODE_IF:
{
uint32_t pos1, pos2;
mrb_bool nil_p = FALSE;
node *elsepart = tree->cdr->cdr->car;
if (!tree->car) {
codegen(s, elsepart, val);
goto exit;
}
if (true_always(tree->car)) {
codegen(s, tree->cdr->car, val);
goto exit;
}
if (false_always(tree->car)) {
codegen(s, elsepart, val);
goto exit;
}
if (nint(tree->car->car) == NODE_CALL) {
node *n = tree->car->cdr;
mrb_sym mid = nsym(n->cdr->car);
mrb_sym sym_nil_p = MRB_SYM_Q_2(s->mrb, nil);
if (mid == sym_nil_p && n->cdr->cdr->car == NULL) {
nil_p = TRUE;
codegen(s, n->car, VAL);
}
}
if (!nil_p) {
codegen(s, tree->car, VAL);
}
pop();
if (val || tree->cdr->car) {
if (nil_p) {
pos2 = genjmp2_0(s, OP_JMPNIL, cursp(), val);
pos1 = genjmp_0(s, OP_JMP);
dispatch(s, pos2);
}
else {
pos1 = genjmp2_0(s, OP_JMPNOT, cursp(), val);
}
codegen(s, tree->cdr->car, val);
if (val) pop();
if (elsepart || val) {
pos2 = genjmp_0(s, OP_JMP);
dispatch(s, pos1);
codegen(s, elsepart, val);
dispatch(s, pos2);
}
else {
dispatch(s, pos1);
}
}
else { /* empty then-part */
if (elsepart) {
if (nil_p) {
pos1 = genjmp2_0(s, OP_JMPNIL, cursp(), val);
}
else {
pos1 = genjmp2_0(s, OP_JMPIF, cursp(), val);
}
codegen(s, elsepart, val);
dispatch(s, pos1);
}
else if (val && !nil_p) {
genop_1(s, OP_LOADNIL, cursp());
push();
}
}
}
break;
case NODE_AND:
{
uint32_t pos;
if (true_always(tree->car)) {
codegen(s, tree->cdr, val);
goto exit;
}
if (false_always(tree->car)) {
codegen(s, tree->car, val);
goto exit;
}
codegen(s, tree->car, VAL);
pop();
pos = genjmp2_0(s, OP_JMPNOT, cursp(), val);
codegen(s, tree->cdr, val);
dispatch(s, pos);
}
break;
case NODE_OR:
{
uint32_t pos;
if (true_always(tree->car)) {
codegen(s, tree->car, val);
goto exit;
}
if (false_always(tree->car)) {
codegen(s, tree->cdr, val);
goto exit;
}
codegen(s, tree->car, VAL);
pop();
pos = genjmp2_0(s, OP_JMPIF, cursp(), val);
codegen(s, tree->cdr, val);
dispatch(s, pos);
}
break;
case NODE_WHILE:
case NODE_UNTIL:
{
if (true_always(tree->car)) {
if (nt == NODE_UNTIL) {
if (val) {
genop_1(s, OP_LOADNIL, cursp());
push();
}
goto exit;
}
}
else if (false_always(tree->car)) {
if (nt == NODE_WHILE) {
if (val) {
genop_1(s, OP_LOADNIL, cursp());
push();
}
goto exit;
}
}
uint32_t pos = JMPLINK_START;
struct loopinfo *lp = loop_push(s, LOOP_NORMAL);
if (!val) lp->reg = -1;
lp->pc0 = new_label(s);
codegen(s, tree->car, VAL);
pop();
if (nt == NODE_WHILE) {
pos = genjmp2_0(s, OP_JMPNOT, cursp(), NOVAL);
}
else {
pos = genjmp2_0(s, OP_JMPIF, cursp(), NOVAL);
}
lp->pc1 = new_label(s);
codegen(s, tree->cdr, NOVAL);
genjmp(s, OP_JMP, lp->pc0);
dispatch(s, pos);
loop_pop(s, val);
}
break;
case NODE_FOR:
for_body(s, tree);
if (val) push();
break;
case NODE_CASE:
{
int head = 0;
uint32_t pos1, pos2, pos3, tmp;
node *n;
pos3 = JMPLINK_START;
if (tree->car) {
head = cursp();
codegen(s, tree->car, VAL);
}
tree = tree->cdr;
while (tree) {
n = tree->car->car;
pos1 = pos2 = JMPLINK_START;
while (n) {
codegen(s, n->car, VAL);
if (head) {
gen_move(s, cursp(), head, 0);
push(); push(); pop(); pop(); pop();
if (nint(n->car->car) == NODE_SPLAT) {
genop_3(s, OP_SEND, cursp(), new_sym(s, MRB_SYM_2(s->mrb, __case_eqq)), 1);
}
else {
genop_3(s, OP_SEND, cursp(), new_sym(s, MRB_OPSYM_2(s->mrb, eqq)), 1);
}
}
else {
pop();
}
tmp = genjmp2(s, OP_JMPIF, cursp(), pos2, NOVAL);
pos2 = tmp;
n = n->cdr;
}
if (tree->car->car) {
pos1 = genjmp_0(s, OP_JMP);
dispatch_linked(s, pos2);
}
codegen(s, tree->car->cdr, val);
if (val) pop();
tmp = genjmp(s, OP_JMP, pos3);
pos3 = tmp;
dispatch(s, pos1);
tree = tree->cdr;
}
if (val) {
uint32_t pos = cursp();
genop_1(s, OP_LOADNIL, cursp());
if (pos3 != JMPLINK_START) dispatch_linked(s, pos3);
if (head) pop();
if (cursp() != pos) {
gen_move(s, cursp(), pos, 0);
}
push();
}
else {
if (pos3 != JMPLINK_START) {
dispatch_linked(s, pos3);
}
if (head) {
pop();
}
}
}
break;
case NODE_SCOPE:
scope_body(s, tree, NOVAL);
break;
case NODE_FCALL:
case NODE_CALL:
gen_call(s, tree, 0, 0, val, 0);
break;
case NODE_SCALL:
gen_call(s, tree, 0, 0, val, 1);
break;
case NODE_DOT2:
codegen(s, tree->car, val);
codegen(s, tree->cdr, val);
if (val) {
pop(); pop();
genop_1(s, OP_RANGE_INC, cursp());
push();
}
break;
case NODE_DOT3:
codegen(s, tree->car, val);
codegen(s, tree->cdr, val);
if (val) {
pop(); pop();
genop_1(s, OP_RANGE_EXC, cursp());
push();
}
break;
case NODE_COLON2:
{
int sym = new_sym(s, nsym(tree->cdr));
codegen(s, tree->car, VAL);
pop();
genop_2(s, OP_GETMCNST, cursp(), sym);
if (val) push();
}
break;
case NODE_COLON3:
{
int sym = new_sym(s, nsym(tree));
genop_1(s, OP_OCLASS, cursp());
genop_2(s, OP_GETMCNST, cursp(), sym);
if (val) push();
}
break;
case NODE_ARRAY:
{
int n;
n = gen_values(s, tree, val, 0, 0);
if (val) {
if (n >= 0) {
pop_n(n);
genop_2(s, OP_ARRAY, cursp(), n);
}
push();
}
}
break;
case NODE_HASH:
case NODE_KW_HASH:
{
int nk = gen_hash(s, tree, val, GEN_LIT_ARY_MAX);
if (val && nk >= 0) {
pop_n(nk*2);
genop_2(s, OP_HASH, cursp(), nk);
push();
}
}
break;
case NODE_SPLAT:
codegen(s, tree, val);
break;
case NODE_ASGN:
gen_assignment(s, tree->car, tree->cdr, 0, val);
break;
case NODE_MASGN:
{
int len = 0, n = 0, post = 0;
node *t = tree->cdr, *p;
int rhs = cursp();
if (nint(t->car) == NODE_ARRAY && t->cdr && nosplat(t->cdr)) {
/* fixed rhs */
t = t->cdr;
while (t) {
codegen(s, t->car, VAL);
len++;
t = t->cdr;
}
tree = tree->car;
if (tree->car) { /* pre */
t = tree->car;
n = 0;
while (t) {
if (n < len) {
gen_assignment(s, t->car, NULL, rhs+n, NOVAL);
n++;
}
else {
genop_1(s, OP_LOADNIL, rhs+n);
gen_assignment(s, t->car, NULL, rhs+n, NOVAL);
}
t = t->cdr;
}
}
t = tree->cdr;
if (t) {
if (t->cdr) { /* post count */
p = t->cdr->car;
while (p) {
post++;
p = p->cdr;
}
}
if (t->car) { /* rest (len - pre - post) */
int rn;
if (len < post + n) {
rn = 0;
}
else {
rn = len - post - n;
}
genop_3(s, OP_ARRAY2, cursp(), rhs+n, rn);
gen_assignment(s, t->car, NULL, cursp(), NOVAL);
n += rn;
}
if (t->cdr && t->cdr->car) {
t = t->cdr->car;
while (n<len) {
gen_assignment(s, t->car, NULL, rhs+n, NOVAL);
t = t->cdr;
n++;
}
}
}
pop_n(len);
if (val) {
genop_2(s, OP_ARRAY, rhs, len);
push();
}
}
else {
/* variable rhs */
codegen(s, t, VAL);
gen_vmassignment(s, tree->car, rhs, val);
if (!val) {
pop();
}
}
}
break;
case NODE_OP_ASGN:
{
mrb_sym sym = nsym(tree->cdr->car);
mrb_int len;
const char *name = mrb_sym_name_len(s->mrb, sym, &len);
int idx, callargs = -1, vsp = -1;
if ((len == 2 && name[0] == '|' && name[1] == '|') &&
(nint(tree->car->car) == NODE_CONST ||
nint(tree->car->car) == NODE_CVAR)) {
int catch_entry, begin, end;
int noexc, exc;
struct loopinfo *lp;
lp = loop_push(s, LOOP_BEGIN);
lp->pc0 = new_label(s);
catch_entry = catch_handler_new(s);
begin = s->pc;
exc = cursp();
codegen(s, tree->car, VAL);
end = s->pc;
noexc = genjmp_0(s, OP_JMP);
lp->type = LOOP_RESCUE;
catch_handler_set(s, catch_entry, MRB_CATCH_RESCUE, begin, end, s->pc);
genop_1(s, OP_EXCEPT, exc);
genop_1(s, OP_LOADF, exc);
dispatch(s, noexc);
loop_pop(s, NOVAL);
}
else if (nint(tree->car->car) == NODE_CALL) {
node *n = tree->car->cdr;
int base, i, nargs = 0;
callargs = 0;
if (val) {
vsp = cursp();
push();
}
codegen(s, n->car, VAL); /* receiver */
idx = new_sym(s, nsym(n->cdr->car));
base = cursp()-1;
if (n->cdr->cdr->car) {
nargs = gen_values(s, n->cdr->cdr->car->car, VAL, 1, 14);
if (nargs >= 0) {
callargs = nargs;
}
else { /* varargs */
push();
nargs = 1;
callargs = CALL_MAXARGS;
}
}
/* copy receiver and arguments */
gen_move(s, cursp(), base, 1);
for (i=0; i<nargs; i++) {
gen_move(s, cursp()+i+1, base+i+1, 1);
}
push_n(nargs+2);pop_n(nargs+2); /* space for receiver, arguments and a block */
genop_3(s, OP_SEND, cursp(), idx, callargs);
push();
}
else {
codegen(s, tree->car, VAL);
}
if (len == 2 &&
((name[0] == '|' && name[1] == '|') ||
(name[0] == '&' && name[1] == '&'))) {
uint32_t pos;
pop();
if (val) {
if (vsp >= 0) {
gen_move(s, vsp, cursp(), 1);
}
pos = genjmp2_0(s, name[0]=='|'?OP_JMPIF:OP_JMPNOT, cursp(), val);
}
else {
pos = genjmp2_0(s, name[0]=='|'?OP_JMPIF:OP_JMPNOT, cursp(), val);
}
codegen(s, tree->cdr->cdr->car, VAL);
pop();
if (val && vsp >= 0) {
gen_move(s, vsp, cursp(), 1);
}
if (nint(tree->car->car) == NODE_CALL) {
if (callargs == CALL_MAXARGS) {
pop();
genop_2(s, OP_ARYPUSH, cursp(), 1);
}
else {
pop_n(callargs);
callargs++;
}
pop();
idx = new_sym(s, attrsym(s, nsym(tree->car->cdr->cdr->car)));
genop_3(s, OP_SEND, cursp(), idx, callargs);
}
else {
gen_assignment(s, tree->car, NULL, cursp(), val);
}
dispatch(s, pos);
goto exit;
}
codegen(s, tree->cdr->cdr->car, VAL);
push(); pop();
pop(); pop();
if (len == 1 && name[0] == '+') {
gen_addsub(s, OP_ADD, cursp());
}
else if (len == 1 && name[0] == '-') {
gen_addsub(s, OP_SUB, cursp());
}
else if (len == 1 && name[0] == '*') {
genop_1(s, OP_MUL, cursp());
}
else if (len == 1 && name[0] == '/') {
genop_1(s, OP_DIV, cursp());
}
else if (len == 1 && name[0] == '<') {
genop_1(s, OP_LT, cursp());
}
else if (len == 2 && name[0] == '<' && name[1] == '=') {
genop_1(s, OP_LE, cursp());
}
else if (len == 1 && name[0] == '>') {
genop_1(s, OP_GT, cursp());
}
else if (len == 2 && name[0] == '>' && name[1] == '=') {
genop_1(s, OP_GE, cursp());
}
else {
idx = new_sym(s, sym);
genop_3(s, OP_SEND, cursp(), idx, 1);
}
if (callargs < 0) {
gen_assignment(s, tree->car, NULL, cursp(), val);
}
else {
if (val && vsp >= 0) {
gen_move(s, vsp, cursp(), 0);
}
if (callargs == CALL_MAXARGS) {
pop();
genop_2(s, OP_ARYPUSH, cursp(), 1);
}
else {
pop_n(callargs);
callargs++;
}
pop();
idx = new_sym(s, attrsym(s,nsym(tree->car->cdr->cdr->car)));
genop_3(s, OP_SEND, cursp(), idx, callargs);
}
}
break;
case NODE_SUPER:
{
codegen_scope *s2 = s;
int lv = 0;
int n = 0, nk = 0, st = 0;
push();
while (!s2->mscope) {
lv++;
s2 = s2->prev;
if (!s2) break;
}
if (tree) {
node *args = tree->car;
if (args) {
st = n = gen_values(s, args, VAL, 0, 14);
if (n < 0) {
st = 1; n = 15;
push();
}
}
/* keyword arguments */
if (s2 && (s2->ainfo & 0x1) && tree->cdr->car) {
nk = gen_hash(s, tree->cdr->car->cdr, VAL, 14);
if (nk < 0) {st++; nk = 15;}
else st += nk*2;
n |= nk<<4;
}
/* block arguments */
if (tree->cdr->cdr) {
codegen(s, tree->cdr->cdr, VAL);
}
else if (!s2) {/* super at top-level */
push(); /* no need to push block */
}
else {
gen_blkmove(s, s2->ainfo, lv);
}
st++;
}
else {
if (!s2) push();
else gen_blkmove(s, s2->ainfo, lv);
st++;
}
pop_n(st+1);
genop_2(s, OP_SUPER, cursp(), n);
if (val) push();
}
break;
case NODE_ZSUPER:
{
codegen_scope *s2 = s;
int lv = 0;
size_t ainfo = 0;
int n = CALL_MAXARGS;
int sp = cursp();
push(); /* room for receiver */
while (!s2->mscope) {
lv++;
s2 = s2->prev;
if (!s2) break;
}
if (s2 && s2->ainfo > 0) {
ainfo = s2->ainfo;
}
if (ainfo > 0) {
genop_2S(s, OP_ARGARY, cursp(), (ainfo<<4)|(lv & 0xf));
push(); push(); push(); /* ARGARY pushes 3 values at most */
pop(); pop(); pop();
/* keyword arguments */
if (ainfo & 0x1) {
n |= CALL_MAXARGS<<4;
push();
}
/* block argument */
if (tree && tree->cdr && tree->cdr->cdr) {
push();
codegen(s, tree->cdr->cdr, VAL);
}
}
else {
/* block argument */
if (tree && tree->cdr && tree->cdr->cdr) {
codegen(s, tree->cdr->cdr, VAL);
}
else {
gen_blkmove(s, 0, lv);
}
n = 0;
}
s->sp = sp;
genop_2(s, OP_SUPER, cursp(), n);
if (val) push();
}
break;
case NODE_RETURN:
if (tree) {
gen_retval(s, tree);
}
else {
genop_1(s, OP_LOADNIL, cursp());
}
if (s->loop) {
gen_return(s, OP_RETURN_BLK, cursp());
}
else {
gen_return(s, OP_RETURN, cursp());
}
if (val) push();
break;
case NODE_YIELD:
{
codegen_scope *s2 = s;
int lv = 0, ainfo = -1;
int n = 0, sendv = 0;
while (!s2->mscope) {
lv++;
s2 = s2->prev;
if (!s2) break;
}
if (s2) {
ainfo = (int)s2->ainfo;
}
if (ainfo < 0) codegen_error(s, "invalid yield (SyntaxError)");
push();
if (tree) {
n = gen_values(s, tree, VAL, 0, 14);
if (n < 0) {
n = sendv = 1;
push();
}
}
push();pop(); /* space for a block */
pop_n(n+1);
genop_2S(s, OP_BLKPUSH, cursp(), (ainfo<<4)|(lv & 0xf));
if (sendv) n = CALL_MAXARGS;
genop_3(s, OP_SEND, cursp(), new_sym(s, MRB_SYM_2(s->mrb, call)), n);
if (val) push();
}
break;
case NODE_BREAK:
loop_break(s, tree);
if (val) push();
break;
case NODE_NEXT:
if (!s->loop) {
raise_error(s, "unexpected next");
}
else if (s->loop->type == LOOP_NORMAL) {
codegen(s, tree, NOVAL);
genjmp(s, OP_JMPUW, s->loop->pc0);
}
else {
if (tree) {
codegen(s, tree, VAL);
pop();
}
else {
genop_1(s, OP_LOADNIL, cursp());
}
gen_return(s, OP_RETURN, cursp());
}
if (val) push();
break;
case NODE_REDO:
if (!s->loop || s->loop->type == LOOP_BEGIN || s->loop->type == LOOP_RESCUE) {
raise_error(s, "unexpected redo");
}
else {
genjmp(s, OP_JMPUW, s->loop->pc1);
}
if (val) push();
break;
case NODE_RETRY:
{
const char *msg = "unexpected retry";
const struct loopinfo *lp = s->loop;
while (lp && lp->type != LOOP_RESCUE) {
lp = lp->prev;
}
if (!lp) {
raise_error(s, msg);
}
else {
genjmp(s, OP_JMPUW, lp->pc0);
}
if (val) push();
}
break;
case NODE_LVAR:
if (val) {
int idx = lv_idx(s, nsym(tree));
if (idx > 0) {
gen_move(s, cursp(), idx, val);
}
else {
gen_getupvar(s, cursp(), nsym(tree));
}
push();
}
break;
case NODE_NVAR:
if (val) {
int idx = nint(tree);
gen_move(s, cursp(), idx, val);
push();
}
break;
case NODE_GVAR:
{
int sym = new_sym(s, nsym(tree));
genop_2(s, OP_GETGV, cursp(), sym);
if (val) push();
}
break;
case NODE_IVAR:
{
int sym = new_sym(s, nsym(tree));
genop_2(s, OP_GETIV, cursp(), sym);
if (val) push();
}
break;
case NODE_CVAR:
{
int sym = new_sym(s, nsym(tree));
genop_2(s, OP_GETCV, cursp(), sym);
if (val) push();
}
break;
case NODE_CONST:
{
int sym = new_sym(s, nsym(tree));
genop_2(s, OP_GETCONST, cursp(), sym);
if (val) push();
}
break;
case NODE_BACK_REF:
if (val) {
char buf[] = {'$', nchar(tree)};
int sym = new_sym(s, mrb_intern(s->mrb, buf, sizeof(buf)));
genop_2(s, OP_GETGV, cursp(), sym);
push();
}
break;
case NODE_NTH_REF:
if (val) {
mrb_state *mrb = s->mrb;
mrb_value str;
int sym;
str = mrb_format(mrb, "$%d", nint(tree));
sym = new_sym(s, mrb_intern_str(mrb, str));
genop_2(s, OP_GETGV, cursp(), sym);
push();
}
break;
case NODE_ARG:
/* should not happen */
break;
case NODE_BLOCK_ARG:
if (!tree) {
int idx = lv_idx(s, MRB_OPSYM_2(s->mrb, and));
if (idx == 0) {
codegen_error(s, "no anonymous block argument");
}
gen_move(s, cursp(), idx, val);
}
else {
codegen(s, tree, val);
}
break;
case NODE_INT:
if (val) {
char *p = (char*)tree->car;
int base = nint(tree->cdr->car);
mrb_int i;
mrb_bool overflow;
i = readint(s, p, base, FALSE, &overflow);
if (overflow) {
int off = new_litbn(s, p, base, FALSE);
genop_2(s, OP_LOADL, cursp(), off);
}
else {
gen_int(s, cursp(), i);
}
push();
}
break;
#ifndef MRB_NO_FLOAT
case NODE_FLOAT:
if (val) {
char *p = (char*)tree;
mrb_float f = mrb_float_read(p, NULL);
int off = new_lit(s, mrb_float_value(s->mrb, f));
genop_2(s, OP_LOADL, cursp(), off);
push();
}
break;
#endif
case NODE_NEGATE:
{
nt = nint(tree->car);
switch (nt) {
#ifndef MRB_NO_FLOAT
case NODE_FLOAT:
if (val) {
char *p = (char*)tree->cdr;
mrb_float f = mrb_float_read(p, NULL);
int off = new_lit(s, mrb_float_value(s->mrb, -f));
genop_2(s, OP_LOADL, cursp(), off);
push();
}
break;
#endif
case NODE_INT:
if (val) {
char *p = (char*)tree->cdr->car;
int base = nint(tree->cdr->cdr->car);
mrb_int i;
mrb_bool overflow;
i = readint(s, p, base, TRUE, &overflow);
if (overflow) {
int off = new_litbn(s, p, base, TRUE);
genop_2(s, OP_LOADL, cursp(), off);
}
else {
gen_int(s, cursp(), i);
}
push();
}
break;
default:
if (val) {
codegen(s, tree, VAL);
pop();
push_n(2);pop_n(2); /* space for receiver&block */
mrb_sym minus = MRB_OPSYM_2(s->mrb, minus);
if (!gen_uniop(s, minus, cursp())) {
genop_3(s, OP_SEND, cursp(), new_sym(s, minus), 0);
}
push();
}
else {
codegen(s, tree, NOVAL);
}
break;
}
}
break;
case NODE_STR:
if (val) {
char *p = (char*)tree->car;
size_t len = (intptr_t)tree->cdr;
int ai = mrb_gc_arena_save(s->mrb);
int off = new_lit(s, mrb_str_new(s->mrb, p, len));
mrb_gc_arena_restore(s->mrb, ai);
genop_2(s, OP_STRING, cursp(), off);
push();
}
break;
case NODE_HEREDOC:
tree = ((struct mrb_parser_heredoc_info *)tree)->doc;
/* fall through */
case NODE_DSTR:
if (val) {
node *n = tree;
if (!n) {
genop_1(s, OP_LOADNIL, cursp());
push();
break;
}
codegen(s, n->car, VAL);
n = n->cdr;
while (n) {
codegen(s, n->car, VAL);
pop(); pop();
genop_1(s, OP_STRCAT, cursp());
push();
n = n->cdr;
}
}
else {
node *n = tree;
while (n) {
if (nint(n->car->car) != NODE_STR) {
codegen(s, n->car, NOVAL);
}
n = n->cdr;
}
}
break;
case NODE_WORDS:
gen_literal_array(s, tree, FALSE, val);
break;
case NODE_SYMBOLS:
gen_literal_array(s, tree, TRUE, val);
break;
case NODE_DXSTR:
{
node *n;
int ai = mrb_gc_arena_save(s->mrb);
int sym = new_sym(s, MRB_SYM_2(s->mrb, Kernel));
genop_1(s, OP_LOADSELF, cursp());
push();
codegen(s, tree->car, VAL);
n = tree->cdr;
while (n) {
if (nint(n->car->car) == NODE_XSTR) {
n->car->car = (struct mrb_ast_node*)(intptr_t)NODE_STR;
mrb_assert(!n->cdr); /* must be the end */
}
codegen(s, n->car, VAL);
pop(); pop();
genop_1(s, OP_STRCAT, cursp());
push();
n = n->cdr;
}
push(); /* for block */
pop_n(3);
sym = new_sym(s, MRB_OPSYM_2(s->mrb, tick)); /* ` */
genop_3(s, OP_SEND, cursp(), sym, 1);
if (val) push();
mrb_gc_arena_restore(s->mrb, ai);
}
break;
case NODE_XSTR:
{
char *p = (char*)tree->car;
size_t len = (intptr_t)tree->cdr;
int ai = mrb_gc_arena_save(s->mrb);
int off = new_lit(s, mrb_str_new(s->mrb, p, len));
int sym;
genop_1(s, OP_LOADSELF, cursp());
push();
genop_2(s, OP_STRING, cursp(), off);
push(); push();
pop_n(3);
sym = new_sym(s, MRB_OPSYM_2(s->mrb, tick)); /* ` */
genop_3(s, OP_SEND, cursp(), sym, 1);
if (val) push();
mrb_gc_arena_restore(s->mrb, ai);
}
break;
case NODE_REGX:
if (val) {
char *p1 = (char*)tree->car;
char *p2 = (char*)tree->cdr->car;
char *p3 = (char*)tree->cdr->cdr;
int ai = mrb_gc_arena_save(s->mrb);
int sym = new_sym(s, mrb_intern_lit(s->mrb, REGEXP_CLASS));
int off = new_lit(s, mrb_str_new_cstr(s->mrb, p1));
int argc = 1;
genop_1(s, OP_OCLASS, cursp());
genop_2(s, OP_GETMCNST, cursp(), sym);
push();
genop_2(s, OP_STRING, cursp(), off);
push();
if (p2 || p3) {
if (p2) { /* opt */
off = new_lit(s, mrb_str_new_cstr(s->mrb, p2));
genop_2(s, OP_STRING, cursp(), off);
}
else {
genop_1(s, OP_LOADNIL, cursp());
}
push();
argc++;
if (p3) { /* enc */
off = new_lit(s, mrb_str_new(s->mrb, p3, 1));
genop_2(s, OP_STRING, cursp(), off);
push();
argc++;
}
}
push(); /* space for a block */
pop_n(argc+2);
sym = new_sym(s, MRB_SYM_2(s->mrb, compile));
genop_3(s, OP_SEND, cursp(), sym, argc);
mrb_gc_arena_restore(s->mrb, ai);
push();
}
break;
case NODE_DREGX:
if (val) {
node *n = tree->car;
int ai = mrb_gc_arena_save(s->mrb);
int sym = new_sym(s, mrb_intern_lit(s->mrb, REGEXP_CLASS));
int argc = 1;
int off;
char *p;
genop_1(s, OP_OCLASS, cursp());
genop_2(s, OP_GETMCNST, cursp(), sym);
push();
codegen(s, n->car, VAL);
n = n->cdr;
while (n) {
codegen(s, n->car, VAL);
pop(); pop();
genop_1(s, OP_STRCAT, cursp());
push();
n = n->cdr;
}
n = tree->cdr->cdr;
if (n->car) { /* tail */
p = (char*)n->car;
off = new_lit(s, mrb_str_new_cstr(s->mrb, p));
codegen(s, tree->car, VAL);
genop_2(s, OP_STRING, cursp(), off);
pop();
genop_1(s, OP_STRCAT, cursp());
push();
}
if (n->cdr->car) { /* opt */
char *p2 = (char*)n->cdr->car;
off = new_lit(s, mrb_str_new_cstr(s->mrb, p2));
genop_2(s, OP_STRING, cursp(), off);
push();
argc++;
}
if (n->cdr->cdr) { /* enc */
char *p2 = (char*)n->cdr->cdr;
off = new_lit(s, mrb_str_new_cstr(s->mrb, p2));
genop_2(s, OP_STRING, cursp(), off);
push();
argc++;
}
push(); /* space for a block */
pop_n(argc+2);
sym = new_sym(s, MRB_SYM_2(s->mrb, compile));
genop_3(s, OP_SEND, cursp(), sym, argc);
mrb_gc_arena_restore(s->mrb, ai);
push();
}
else {
node *n = tree->car;
while (n) {
if (nint(n->car->car) != NODE_STR) {
codegen(s, n->car, NOVAL);
}
n = n->cdr;
}
}
break;
case NODE_SYM:
if (val) {
int sym = new_sym(s, nsym(tree));
genop_2(s, OP_LOADSYM, cursp(), sym);
push();
}
break;
case NODE_DSYM:
codegen(s, tree, val);
if (val) {
gen_intern(s);
}
break;
case NODE_SELF:
if (val) {
genop_1(s, OP_LOADSELF, cursp());
push();
}
break;
case NODE_NIL:
if (val) {
genop_1(s, OP_LOADNIL, cursp());
push();
}
break;
case NODE_TRUE:
if (val) {
genop_1(s, OP_LOADT, cursp());
push();
}
break;
case NODE_FALSE:
if (val) {
genop_1(s, OP_LOADF, cursp());
push();
}
break;
case NODE_ALIAS:
{
int a = new_sym(s, nsym(tree->car));
int b = new_sym(s, nsym(tree->cdr));
genop_2(s, OP_ALIAS, a, b);
if (val) {
genop_1(s, OP_LOADNIL, cursp());
push();
}
}
break;
case NODE_UNDEF:
{
node *t = tree;
while (t) {
int symbol = new_sym(s, nsym(t->car));
genop_1(s, OP_UNDEF, symbol);
t = t->cdr;
}
if (val) {
genop_1(s, OP_LOADNIL, cursp());
push();
}
}
break;
case NODE_CLASS:
{
int idx;
node *body;
if (tree->car->car == (node*)0) {
genop_1(s, OP_LOADNIL, cursp());
push();
}
else if (tree->car->car == (node*)1) {
genop_1(s, OP_OCLASS, cursp());
push();
}
else {
codegen(s, tree->car->car, VAL);
}
if (tree->cdr->car) {
codegen(s, tree->cdr->car, VAL);
}
else {
genop_1(s, OP_LOADNIL, cursp());
push();
}
pop(); pop();
idx = new_sym(s, nsym(tree->car->cdr));
genop_2(s, OP_CLASS, cursp(), idx);
body = tree->cdr->cdr->car;
if (nint(body->cdr->car) == NODE_BEGIN && body->cdr->cdr == NULL) {
genop_1(s, OP_LOADNIL, cursp());
}
else {
idx = scope_body(s, body, val);
genop_2(s, OP_EXEC, cursp(), idx);
}
if (val) {
push();
}
}
break;
case NODE_MODULE:
{
int idx;
if (tree->car->car == (node*)0) {
genop_1(s, OP_LOADNIL, cursp());
push();
}
else if (tree->car->car == (node*)1) {
genop_1(s, OP_OCLASS, cursp());
push();
}
else {
codegen(s, tree->car->car, VAL);
}
pop();
idx = new_sym(s, nsym(tree->car->cdr));
genop_2(s, OP_MODULE, cursp(), idx);
if (nint(tree->cdr->car->cdr->car) == NODE_BEGIN &&
tree->cdr->car->cdr->cdr == NULL) {
genop_1(s, OP_LOADNIL, cursp());
}
else {
idx = scope_body(s, tree->cdr->car, val);
genop_2(s, OP_EXEC, cursp(), idx);
}
if (val) {
push();
}
}
break;
case NODE_SCLASS:
{
int idx;
codegen(s, tree->car, VAL);
pop();
genop_1(s, OP_SCLASS, cursp());
if (nint(tree->cdr->car->cdr->car) == NODE_BEGIN &&
tree->cdr->car->cdr->cdr == NULL) {
genop_1(s, OP_LOADNIL, cursp());
}
else {
idx = scope_body(s, tree->cdr->car, val);
genop_2(s, OP_EXEC, cursp(), idx);
}
if (val) {
push();
}
}
break;
case NODE_DEF:
{
int sym = new_sym(s, nsym(tree->car));
int idx = lambda_body(s, tree->cdr, 0);
genop_1(s, OP_TCLASS, cursp());
push();
genop_2(s, OP_METHOD, cursp(), idx);
push(); pop();
pop();
genop_2(s, OP_DEF, cursp(), sym);
if (val) push();
}
break;
case NODE_SDEF:
{
node *recv = tree->car;
int sym = new_sym(s, nsym(tree->cdr->car));
int idx = lambda_body(s, tree->cdr->cdr, 0);
codegen(s, recv, VAL);
pop();
genop_1(s, OP_SCLASS, cursp());
push();
genop_2(s, OP_METHOD, cursp(), idx);
pop();
genop_2(s, OP_DEF, cursp(), sym);
if (val) push();
}
break;
case NODE_POSTEXE:
codegen(s, tree, NOVAL);
break;
default:
break;
}
exit:
s->rlev = rlev;
}
static void
scope_add_irep(codegen_scope *s)
{
mrb_irep *irep;
codegen_scope *prev = s->prev;
if (prev->irep == NULL) {
irep = mrb_add_irep(s->mrb);
prev->irep = s->irep = irep;
return;
}
else {
if (prev->irep->rlen == UINT16_MAX) {
codegen_error(s, "too many nested blocks/methods");
}
s->irep = irep = mrb_add_irep(s->mrb);
if (prev->irep->rlen == prev->rcapa) {
prev->rcapa *= 2;
prev->reps = (mrb_irep**)codegen_realloc(s, prev->reps, sizeof(mrb_irep*)*prev->rcapa);
}
prev->reps[prev->irep->rlen] = irep;
prev->irep->rlen++;
}
}
static codegen_scope*
scope_new(mrb_state *mrb, codegen_scope *prev, node *nlv)
{
static const codegen_scope codegen_scope_zero = { 0 };
mrb_pool *pool = mrb_pool_open(mrb);
codegen_scope *s = (codegen_scope *)mrb_pool_alloc(pool, sizeof(codegen_scope));
if (!s) {
if (prev)
codegen_error(prev, "unexpected scope");
return NULL;
}
*s = codegen_scope_zero;
s->mrb = mrb;
s->mpool = pool;
if (!prev) return s;
s->prev = prev;
s->ainfo = 0;
s->mscope = 0;
scope_add_irep(s);
s->rcapa = 8;
s->reps = (mrb_irep**)mrb_malloc(mrb, sizeof(mrb_irep*)*s->rcapa);
s->icapa = 1024;
s->iseq = (mrb_code*)mrb_malloc(mrb, sizeof(mrb_code)*s->icapa);
s->pcapa = 32;
s->pool = (mrb_pool_value*)mrb_malloc(mrb, sizeof(mrb_pool_value)*s->pcapa);
s->scapa = 256;
s->syms = (mrb_sym*)mrb_malloc(mrb, sizeof(mrb_sym)*s->scapa);
s->lv = nlv;
s->sp += node_len(nlv)+1; /* add self */
s->nlocals = s->sp;
if (nlv) {
mrb_sym *lv;
node *n = nlv;
size_t i = 0;
s->irep->lv = lv = (mrb_sym*)mrb_malloc(mrb, sizeof(mrb_sym)*(s->nlocals-1));
for (i=0, n=nlv; n; i++,n=n->cdr) {
lv[i] = lv_name(n);
}
mrb_assert(i + 1 == s->nlocals);
}
s->ai = mrb_gc_arena_save(mrb);
s->filename_sym = prev->filename_sym;
if (s->filename_sym) {
s->lines = (uint16_t*)mrb_malloc(mrb, sizeof(short)*s->icapa);
}
s->lineno = prev->lineno;
/* debug setting */
s->debug_start_pos = 0;
if (s->filename_sym) {
mrb_debug_info_alloc(mrb, s->irep);
}
else {
s->irep->debug_info = NULL;
}
s->parser = prev->parser;
s->filename_index = prev->filename_index;
s->rlev = prev->rlev+1;
return s;
}
static void
scope_finish(codegen_scope *s)
{
mrb_state *mrb = s->mrb;
mrb_irep *irep = s->irep;
if (s->nlocals > 0xff) {
codegen_error(s, "too many local variables");
}
irep->flags = 0;
if (s->iseq) {
size_t catchsize = sizeof(struct mrb_irep_catch_handler) * irep->clen;
irep->iseq = (const mrb_code *)codegen_realloc(s, s->iseq, sizeof(mrb_code)*s->pc + catchsize);
irep->ilen = s->pc;
if (irep->clen > 0) {
memcpy((void *)(irep->iseq + irep->ilen), s->catch_table, catchsize);
}
}
else {
irep->clen = 0;
}
mrb_free(s->mrb, s->catch_table);
s->catch_table = NULL;
irep->pool = (const mrb_pool_value*)codegen_realloc(s, s->pool, sizeof(mrb_pool_value)*irep->plen);
irep->syms = (const mrb_sym*)codegen_realloc(s, s->syms, sizeof(mrb_sym)*irep->slen);
irep->reps = (const mrb_irep**)codegen_realloc(s, s->reps, sizeof(mrb_irep*)*irep->rlen);
if (s->filename_sym) {
mrb_sym fname = mrb_parser_get_filename(s->parser, s->filename_index);
const char *filename = mrb_sym_name_len(s->mrb, fname, NULL);
mrb_debug_info_append_file(s->mrb, s->irep->debug_info,
filename, s->lines, s->debug_start_pos, s->pc);
}
mrb_free(s->mrb, s->lines);
irep->nlocals = s->nlocals;
irep->nregs = s->nregs;
mrb_gc_arena_restore(mrb, s->ai);
mrb_pool_close(s->mpool);
}
static struct loopinfo*
loop_push(codegen_scope *s, enum looptype t)
{
struct loopinfo *p = (struct loopinfo *)codegen_palloc(s, sizeof(struct loopinfo));
p->type = t;
p->pc0 = p->pc1 = p->pc2 = JMPLINK_START;
p->prev = s->loop;
p->reg = cursp();
s->loop = p;
return p;
}
static void
loop_break(codegen_scope *s, node *tree)
{
if (!s->loop) {
codegen(s, tree, NOVAL);
raise_error(s, "unexpected break");
}
else {
struct loopinfo *loop;
loop = s->loop;
if (tree) {
if (loop->reg < 0) {
codegen(s, tree, NOVAL);
}
else {
gen_retval(s, tree);
}
}
while (loop) {
if (loop->type == LOOP_BEGIN) {
loop = loop->prev;
}
else if (loop->type == LOOP_RESCUE) {
loop = loop->prev;
}
else{
break;
}
}
if (!loop) {
raise_error(s, "unexpected break");
return;
}
if (loop->type == LOOP_NORMAL) {
int tmp;
if (loop->reg >= 0) {
if (tree) {
gen_move(s, loop->reg, cursp(), 0);
}
else {
genop_1(s, OP_LOADNIL, loop->reg);
}
}
tmp = genjmp(s, OP_JMPUW, loop->pc2);
loop->pc2 = tmp;
}
else {
if (!tree) {
genop_1(s, OP_LOADNIL, cursp());
}
gen_return(s, OP_BREAK, cursp());
}
}
}
static void
loop_pop(codegen_scope *s, int val)
{
if (val) {
genop_1(s, OP_LOADNIL, cursp());
}
dispatch_linked(s, s->loop->pc2);
s->loop = s->loop->prev;
if (val) push();
}
static int
catch_handler_new(codegen_scope *s)
{
size_t newsize = sizeof(struct mrb_irep_catch_handler) * (s->irep->clen + 1);
s->catch_table = (struct mrb_irep_catch_handler *)codegen_realloc(s, (void *)s->catch_table, newsize);
return s->irep->clen ++;
}
static void
catch_handler_set(codegen_scope *s, int ent, enum mrb_catch_type type, uint32_t begin, uint32_t end, uint32_t target)
{
struct mrb_irep_catch_handler *e;
mrb_assert(ent >= 0 && ent < s->irep->clen);
e = &s->catch_table[ent];
uint8_to_bin(type, &e->type);
mrb_irep_catch_handler_pack(begin, e->begin);
mrb_irep_catch_handler_pack(end, e->end);
mrb_irep_catch_handler_pack(target, e->target);
}
static struct RProc*
generate_code(mrb_state *mrb, parser_state *p, int val)
{
codegen_scope *scope = scope_new(mrb, 0, 0);
struct mrb_jmpbuf *prev_jmp = mrb->jmp;
struct mrb_jmpbuf jmpbuf;
struct RProc *proc;
mrb->jmp = &jmpbuf;
scope->mrb = mrb;
scope->parser = p;
scope->filename_sym = p->filename_sym;
scope->filename_index = p->current_filename_index;
MRB_TRY(mrb->jmp) {
/* prepare irep */
codegen(scope, p->tree, val);
proc = mrb_proc_new(mrb, scope->irep);
mrb_irep_decref(mrb, scope->irep);
mrb_pool_close(scope->mpool);
proc->c = NULL;
if (mrb->c->cibase && mrb->c->cibase->proc == proc->upper) {
proc->upper = NULL;
}
mrb->jmp = prev_jmp;
return proc;
}
MRB_CATCH(mrb->jmp) {
mrb_irep_decref(mrb, scope->irep);
mrb_pool_close(scope->mpool);
mrb->jmp = prev_jmp;
return NULL;
}
MRB_END_EXC(mrb->jmp);
}
MRB_API struct RProc*
mrb_generate_code(mrb_state *mrb, parser_state *p)
{
return generate_code(mrb, p, VAL);
}
void
mrb_irep_remove_lv(mrb_state *mrb, mrb_irep *irep)
{
int i;
if (irep->flags & MRB_IREP_NO_FREE) return;
if (irep->lv) {
mrb_free(mrb, (void*)irep->lv);
irep->lv = NULL;
}
if (!irep->reps) return;
for (i = 0; i < irep->rlen; ++i) {
mrb_irep_remove_lv(mrb, (mrb_irep*)irep->reps[i]);
}
}
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