mruby/src/load.c at stable · jasl/mruby · GitHub

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** load.c - mruby binary loader

** See Copyright Notice in mruby.h

#include <limits.h>

#include <stdlib.h>

#include <string.h>

#include <math.h>

#include <mruby/dump.h>

#include <mruby/irep.h>

#include <mruby/proc.h>

#include <mruby/string.h>

#include <mruby/debug.h>

#include <mruby/error.h>

#if SIZE_MAX < UINT32_MAX

# error size_t must be at least 32 bits wide

#endif

#define FLAG_BYTEORDER_BIG 2

#define FLAG_BYTEORDER_LIL 4

#define FLAG_BYTEORDER_NATIVE 8

#define FLAG_SRC_MALLOC 1

#define FLAG_SRC_STATIC 0

#define SIZE_ERROR_MUL(nmemb, size) ((size_t)(nmemb) > SIZE_MAX / (size))

static size_t

skip_padding(const uint8_t *buf)

{

const size_t align = MRB_DUMP_ALIGNMENT;

return -(intptr_t)buf & (align-1);

}

static size_t

offset_crc_body(void)

{

struct rite_binary_header header;

return ((uint8_t *)header.binary_crc - (uint8_t *)&header) + sizeof(header.binary_crc);

}

#ifndef MRB_WITHOUT_FLOAT

static double

str_to_double(mrb_state *mrb, mrb_value str)

{

const char *p = RSTRING_PTR(str);

mrb_int len = RSTRING_LEN(str);

/* `i`, `inf`, `infinity` */

if (len > 0 && p[0] == 'i') return INFINITY;

/* `I`, `-inf`, `-infinity` */

if (p[0] == 'I' || (len > 1 && p[0] == '-' && p[1] == 'i')) return -INFINITY;

return mrb_str_to_dbl(mrb, str, TRUE);

}

#endif

static mrb_irep*

read_irep_record_1(mrb_state *mrb, const uint8_t *bin, size_t *len, uint8_t flags)

{

int i;

const uint8_t *src = bin;

ptrdiff_t diff;

uint16_t tt, pool_data_len, snl;

int plen;

int ai = mrb_gc_arena_save(mrb);

mrb_irep *irep = mrb_add_irep(mrb);

/* skip record size */

src += sizeof(uint32_t);

/* number of local variable */

irep->nlocals = bin_to_uint16(src);

src += sizeof(uint16_t);

/* number of register variable */

irep->nregs = bin_to_uint16(src);

src += sizeof(uint16_t);

/* number of child irep */

irep->rlen = (size_t)bin_to_uint16(src);

src += sizeof(uint16_t);

/* Binary Data Section */

/* ISEQ BLOCK */

irep->ilen = (uint16_t)bin_to_uint32(src);

src += sizeof(uint32_t);

src += skip_padding(src);

if (irep->ilen > 0) {

if (SIZE_ERROR_MUL(irep->ilen, sizeof(mrb_code))) {

return NULL;

}

if ((flags & FLAG_SRC_MALLOC) == 0 &&

(flags & FLAG_BYTEORDER_NATIVE)) {

irep->iseq = (mrb_code*)src;

src += sizeof(mrb_code) * irep->ilen;

irep->flags |= MRB_ISEQ_NO_FREE;

}

else {

size_t data_len = sizeof(mrb_code) * irep->ilen;

void *buf = mrb_malloc(mrb, data_len);

irep->iseq = (mrb_code *)buf;

memcpy(buf, src, data_len);

src += data_len;

}

/* POOL BLOCK */

plen = bin_to_uint32(src); /* number of pool */

src += sizeof(uint32_t);

if (plen > 0) {

if (SIZE_ERROR_MUL(plen, sizeof(mrb_value))) {

return NULL;

}

irep->pool = (mrb_value*)mrb_malloc(mrb, sizeof(mrb_value) * plen);

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

mrb_value s;

tt = *src++; /* pool TT */

pool_data_len = bin_to_uint16(src); /* pool data length */

src += sizeof(uint16_t);

if (flags & FLAG_SRC_MALLOC) {

s = mrb_str_new(mrb, (char *)src, pool_data_len);

}

else {

s = mrb_str_new_static(mrb, (char *)src, pool_data_len);

}

src += pool_data_len;

switch (tt) { /* pool data */

case IREP_TT_FIXNUM: {

mrb_value num = mrb_str_to_inum(mrb, s, 10, FALSE);

#ifdef MRB_WITHOUT_FLOAT

irep->pool[i] = num;

#else

irep->pool[i] = mrb_float_p(num)? mrb_float_pool(mrb, mrb_float(num)) : num;

#endif

}

break;

#ifndef MRB_WITHOUT_FLOAT

case IREP_TT_FLOAT:

irep->pool[i] = mrb_float_pool(mrb, str_to_double(mrb, s));

break;

#endif

case IREP_TT_STRING:

irep->pool[i] = mrb_str_pool(mrb, s);

break;

default:

/* should not happen */

irep->pool[i] = mrb_nil_value();

break;

}

irep->plen++;

mrb_gc_arena_restore(mrb, ai);

}

/* SYMS BLOCK */

irep->slen = (uint16_t)bin_to_uint32(src); /* syms length */

src += sizeof(uint32_t);

if (irep->slen > 0) {

if (SIZE_ERROR_MUL(irep->slen, sizeof(mrb_sym))) {

return NULL;

}

irep->syms = (mrb_sym *)mrb_malloc(mrb, sizeof(mrb_sym) * irep->slen);

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

snl = bin_to_uint16(src); /* symbol name length */

src += sizeof(uint16_t);

if (snl == MRB_DUMP_NULL_SYM_LEN) {

irep->syms[i] = 0;

continue;

}

if (flags & FLAG_SRC_MALLOC) {

irep->syms[i] = mrb_intern(mrb, (char *)src, snl);

}

else {

irep->syms[i] = mrb_intern_static(mrb, (char *)src, snl);

}

src += snl + 1;

mrb_gc_arena_restore(mrb, ai);

}

irep->reps = (mrb_irep**)mrb_malloc(mrb, sizeof(mrb_irep*)*irep->rlen);

diff = src - bin;

mrb_assert_int_fit(ptrdiff_t, diff, size_t, SIZE_MAX);

*len = (size_t)diff;

return irep;

}

static mrb_irep*

read_irep_record(mrb_state *mrb, const uint8_t *bin, size_t *len, uint8_t flags)

{

mrb_irep *irep = read_irep_record_1(mrb, bin, len, flags);

int i;

if (irep == NULL) {

return NULL;

}

bin += *len;

for (i=0; i<irep->rlen; i++) {

size_t rlen;

irep->reps[i] = read_irep_record(mrb, bin, &rlen, flags);

if (irep->reps[i] == NULL) {

return NULL;

}

bin += rlen;

*len += rlen;

}

return irep;

}

static mrb_irep*

read_section_irep(mrb_state *mrb, const uint8_t *bin, uint8_t flags)

{

size_t len;

bin += sizeof(struct rite_section_irep_header);

return read_irep_record(mrb, bin, &len, flags);

}

static int

read_debug_record(mrb_state *mrb, const uint8_t *start, mrb_irep* irep, size_t *record_len, const mrb_sym *filenames, size_t filenames_len)

{

const uint8_t *bin = start;

ptrdiff_t diff;

size_t record_size;

uint16_t f_idx;

int i;

if (irep->debug_info) { return MRB_DUMP_INVALID_IREP; }

irep->debug_info = (mrb_irep_debug_info*)mrb_malloc(mrb, sizeof(mrb_irep_debug_info));

irep->debug_info->pc_count = (uint32_t)irep->ilen;

record_size = (size_t)bin_to_uint32(bin);

bin += sizeof(uint32_t);

irep->debug_info->flen = bin_to_uint16(bin);

irep->debug_info->files = (mrb_irep_debug_info_file**)mrb_malloc(mrb, sizeof(mrb_irep_debug_info*) * irep->debug_info->flen);

bin += sizeof(uint16_t);

for (f_idx = 0; f_idx < irep->debug_info->flen; ++f_idx) {

mrb_irep_debug_info_file *file;

uint16_t filename_idx;

file = (mrb_irep_debug_info_file *)mrb_malloc(mrb, sizeof(*file));

irep->debug_info->files[f_idx] = file;

file->start_pos = bin_to_uint32(bin);

bin += sizeof(uint32_t);

/* filename */

filename_idx = bin_to_uint16(bin);

bin += sizeof(uint16_t);

mrb_assert(filename_idx < filenames_len);

file->filename_sym = filenames[filename_idx];

file->line_entry_count = bin_to_uint32(bin);

bin += sizeof(uint32_t);

file->line_type = (mrb_debug_line_type)bin_to_uint8(bin);

bin += sizeof(uint8_t);

switch (file->line_type) {

case mrb_debug_line_ary: {

uint32_t l;

file->lines.ary = (uint16_t *)mrb_malloc(mrb, sizeof(uint16_t) * (size_t)(file->line_entry_count));

for (l = 0; l < file->line_entry_count; ++l) {

file->lines.ary[l] = bin_to_uint16(bin);

bin += sizeof(uint16_t);

}

} break;

case mrb_debug_line_flat_map: {

uint32_t l;

file->lines.flat_map = (mrb_irep_debug_info_line*)mrb_malloc(

mrb, sizeof(mrb_irep_debug_info_line) * (size_t)(file->line_entry_count));

for (l = 0; l < file->line_entry_count; ++l) {

file->lines.flat_map[l].start_pos = bin_to_uint32(bin);

bin += sizeof(uint32_t);

file->lines.flat_map[l].line = bin_to_uint16(bin);

bin += sizeof(uint16_t);

}

} break;

default: return MRB_DUMP_GENERAL_FAILURE;

}

diff = bin - start;

mrb_assert_int_fit(ptrdiff_t, diff, size_t, SIZE_MAX);

if (record_size != (size_t)diff) {

return MRB_DUMP_GENERAL_FAILURE;

}

for (i = 0; i < irep->rlen; i++) {

size_t len;

int ret;

ret = read_debug_record(mrb, bin, irep->reps[i], &len, filenames, filenames_len);

if (ret != MRB_DUMP_OK) return ret;

bin += len;

}

diff = bin - start;

mrb_assert_int_fit(ptrdiff_t, diff, size_t, SIZE_MAX);

*record_len = (size_t)diff;

return MRB_DUMP_OK;

}

static int

read_section_debug(mrb_state *mrb, const uint8_t *start, mrb_irep *irep, uint8_t flags)

{

const uint8_t *bin;

ptrdiff_t diff;

struct rite_section_debug_header *header;

uint16_t i;

size_t len = 0;

int result;

uint16_t filenames_len;

mrb_sym *filenames;

bin = start;

header = (struct rite_section_debug_header *)bin;

bin += sizeof(struct rite_section_debug_header);

filenames_len = bin_to_uint16(bin);

bin += sizeof(uint16_t);

filenames = (mrb_sym*)mrb_malloc(mrb, sizeof(mrb_sym) * (size_t)filenames_len);

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

uint16_t f_len = bin_to_uint16(bin);

bin += sizeof(uint16_t);

if (flags & FLAG_SRC_MALLOC) {

filenames[i] = mrb_intern(mrb, (const char *)bin, (size_t)f_len);

}

else {

filenames[i] = mrb_intern_static(mrb, (const char *)bin, (size_t)f_len);

}

bin += f_len;

}

result = read_debug_record(mrb, bin, irep, &len, filenames, filenames_len);

if (result != MRB_DUMP_OK) goto debug_exit;

bin += len;

diff = bin - start;

mrb_assert_int_fit(ptrdiff_t, diff, size_t, SIZE_MAX);

if ((uint32_t)diff != bin_to_uint32(header->section_size)) {

result = MRB_DUMP_GENERAL_FAILURE;

}

debug_exit:

mrb_free(mrb, filenames);

return result;

}

static int

read_lv_record(mrb_state *mrb, const uint8_t *start, mrb_irep *irep, size_t *record_len, mrb_sym const *syms, uint32_t syms_len)

{

const uint8_t *bin = start;

ptrdiff_t diff;

int i;

irep->lv = (struct mrb_locals*)mrb_malloc(mrb, sizeof(struct mrb_locals) * (irep->nlocals - 1));

for (i = 0; i + 1< irep->nlocals; ++i) {

uint16_t const sym_idx = bin_to_uint16(bin);

bin += sizeof(uint16_t);

if (sym_idx == RITE_LV_NULL_MARK) {

irep->lv[i].name = 0;

irep->lv[i].r = 0;

}

else {

if (sym_idx >= syms_len) {

return MRB_DUMP_GENERAL_FAILURE;

}

irep->lv[i].name = syms[sym_idx];

irep->lv[i].r = bin_to_uint16(bin);

}

bin += sizeof(uint16_t);

}

for (i = 0; i < irep->rlen; ++i) {

size_t len;

int ret;

ret = read_lv_record(mrb, bin, irep->reps[i], &len, syms, syms_len);

if (ret != MRB_DUMP_OK) return ret;

bin += len;

}

diff = bin - start;

mrb_assert_int_fit(ptrdiff_t, diff, size_t, SIZE_MAX);

*record_len = (size_t)diff;

return MRB_DUMP_OK;

}

static int

read_section_lv(mrb_state *mrb, const uint8_t *start, mrb_irep *irep, uint8_t flags)

{

const uint8_t *bin;

ptrdiff_t diff;

struct rite_section_lv_header const *header;

uint32_t i;

size_t len = 0;

int result;

uint32_t syms_len;

mrb_sym *syms;

mrb_sym (*intern_func)(mrb_state*, const char*, size_t) =

(flags & FLAG_SRC_MALLOC)? mrb_intern : mrb_intern_static;

bin = start;

header = (struct rite_section_lv_header const*)bin;

bin += sizeof(struct rite_section_lv_header);

syms_len = bin_to_uint32(bin);

bin += sizeof(uint32_t);

syms = (mrb_sym*)mrb_malloc(mrb, sizeof(mrb_sym) * (size_t)syms_len);

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

uint16_t const str_len = bin_to_uint16(bin);

bin += sizeof(uint16_t);

syms[i] = intern_func(mrb, (const char*)bin, str_len);

bin += str_len;

}

result = read_lv_record(mrb, bin, irep, &len, syms, syms_len);

if (result != MRB_DUMP_OK) goto lv_exit;

bin += len;

diff = bin - start;

mrb_assert_int_fit(ptrdiff_t, diff, size_t, SIZE_MAX);

if ((uint32_t)diff != bin_to_uint32(header->section_size)) {

result = MRB_DUMP_GENERAL_FAILURE;

}

lv_exit:

mrb_free(mrb, syms);

return result;

}

static int

read_binary_header(const uint8_t *bin, size_t bufsize, size_t *bin_size, uint16_t *crc, uint8_t *flags)

{

const struct rite_binary_header *header = (const struct rite_binary_header *)bin;

if (bufsize < sizeof(struct rite_binary_header)) {

return MRB_DUMP_READ_FAULT;

}

if (memcmp(header->binary_ident, RITE_BINARY_IDENT, sizeof(header->binary_ident)) == 0) {

if (bigendian_p())

*flags |= FLAG_BYTEORDER_NATIVE;

else

*flags |= FLAG_BYTEORDER_BIG;

}

else if (memcmp(header->binary_ident, RITE_BINARY_IDENT_LIL, sizeof(header->binary_ident)) == 0) {

if (bigendian_p())

*flags |= FLAG_BYTEORDER_LIL;

else

*flags |= FLAG_BYTEORDER_NATIVE;

}

else {

return MRB_DUMP_INVALID_FILE_HEADER;

}

if (memcmp(header->binary_version, RITE_BINARY_FORMAT_VER, sizeof(header->binary_version)) != 0) {

return MRB_DUMP_INVALID_FILE_HEADER;

}

if (crc) {

*crc = bin_to_uint16(header->binary_crc);

}

*bin_size = (size_t)bin_to_uint32(header->binary_size);

if (bufsize < *bin_size) {

return MRB_DUMP_READ_FAULT;

}

return MRB_DUMP_OK;

}

static mrb_irep*

read_irep(mrb_state *mrb, const uint8_t *bin, size_t bufsize, uint8_t flags)

{

int result;

mrb_irep *irep = NULL;

const struct rite_section_header *section_header;

uint16_t crc;

size_t bin_size = 0;

size_t n;

if ((mrb == NULL) || (bin == NULL)) {

return NULL;

}

result = read_binary_header(bin, bufsize, &bin_size, &crc, &flags);

if (result != MRB_DUMP_OK) {

return NULL;

}

n = offset_crc_body();

if (crc != calc_crc_16_ccitt(bin + n, bin_size - n, 0)) {

return NULL;

}

bin += sizeof(struct rite_binary_header);

do {

section_header = (const struct rite_section_header *)bin;

if (memcmp(section_header->section_ident, RITE_SECTION_IREP_IDENT, sizeof(section_header->section_ident)) == 0) {

irep = read_section_irep(mrb, bin, flags);

if (!irep) return NULL;

}

else if (memcmp(section_header->section_ident, RITE_SECTION_DEBUG_IDENT, sizeof(section_header->section_ident)) == 0) {

if (!irep) return NULL; /* corrupted data */

result = read_section_debug(mrb, bin, irep, flags);

if (result < MRB_DUMP_OK) {

return NULL;

}

else if (memcmp(section_header->section_ident, RITE_SECTION_LV_IDENT, sizeof(section_header->section_ident)) == 0) {

if (!irep) return NULL;

result = read_section_lv(mrb, bin, irep, flags);

if (result < MRB_DUMP_OK) {

return NULL;

}

bin += bin_to_uint32(section_header->section_size);

} while (memcmp(section_header->section_ident, RITE_BINARY_EOF, sizeof(section_header->section_ident)) != 0);

return irep;

}

mrb_irep*

mrb_read_irep(mrb_state *mrb, const uint8_t *bin)

{

#if defined(MRB_USE_LINK_TIME_RO_DATA_P) || defined(MRB_USE_CUSTOM_RO_DATA_P)

uint8_t flags = mrb_ro_data_p((char*)bin) ? FLAG_SRC_STATIC : FLAG_SRC_MALLOC;

#else

uint8_t flags = FLAG_SRC_STATIC;

#endif

return read_irep(mrb, bin, (size_t)-1, flags);

}

MRB_API mrb_irep*

mrb_read_irep_buf(mrb_state *mrb, const void *buf, size_t bufsize)

{

return read_irep(mrb, (const uint8_t *)buf, bufsize, FLAG_SRC_MALLOC);

}

void mrb_exc_set(mrb_state *mrb, mrb_value exc);

static void

irep_error(mrb_state *mrb)

{

mrb_exc_set(mrb, mrb_exc_new_str_lit(mrb, E_SCRIPT_ERROR, "irep load error"));

}

void mrb_codedump_all(mrb_state*, struct RProc*);

static mrb_value

load_irep(mrb_state *mrb, mrb_irep *irep, mrbc_context *c)

{

struct RProc *proc;

if (!irep) {

irep_error(mrb);

return mrb_nil_value();

}

proc = mrb_proc_new(mrb, irep);

proc->c = NULL;

mrb_irep_decref(mrb, irep);

if (c && c->dump_result) mrb_codedump_all(mrb, proc);

if (c && c->no_exec) return mrb_obj_value(proc);

return mrb_top_run(mrb, proc, mrb_top_self(mrb), 0);

}

MRB_API mrb_value

mrb_load_irep_cxt(mrb_state *mrb, const uint8_t *bin, mrbc_context *c)

{

return load_irep(mrb, mrb_read_irep(mrb, bin), c);

}

MRB_API mrb_value

mrb_load_irep_buf_cxt(mrb_state *mrb, const void *buf, size_t bufsize, mrbc_context *c)

{

return load_irep(mrb, mrb_read_irep_buf(mrb, buf, bufsize), c);

}

MRB_API mrb_value

mrb_load_irep(mrb_state *mrb, const uint8_t *bin)

{

return mrb_load_irep_cxt(mrb, bin, NULL);

}

MRB_API mrb_value

mrb_load_irep_buf(mrb_state *mrb, const void *buf, size_t bufsize)

{

return mrb_load_irep_buf_cxt(mrb, buf, bufsize, NULL);

}

#ifndef MRB_DISABLE_STDIO

mrb_irep*

mrb_read_irep_file(mrb_state *mrb, FILE* fp)

{

mrb_irep *irep = NULL;

uint8_t *buf;

const size_t header_size = sizeof(struct rite_binary_header);

size_t buf_size = 0;

uint8_t flags = 0;

int result;

if ((mrb == NULL) || (fp == NULL)) {

return NULL;

}

buf = (uint8_t*)mrb_malloc(mrb, header_size);

if (fread(buf, header_size, 1, fp) == 0) {

goto irep_exit;

}

result = read_binary_header(buf, (size_t)-1, &buf_size, NULL, &flags);

if (result != MRB_DUMP_OK || buf_size <= header_size) {

goto irep_exit;

}

buf = (uint8_t*)mrb_realloc(mrb, buf, buf_size);

if (fread(buf+header_size, buf_size-header_size, 1, fp) == 0) {

goto irep_exit;

}

irep = read_irep(mrb, buf, (size_t)-1, FLAG_SRC_MALLOC);

irep_exit:

mrb_free(mrb, buf);

return irep;

}

MRB_API mrb_value

mrb_load_irep_file_cxt(mrb_state *mrb, FILE* fp, mrbc_context *c)

{

return load_irep(mrb, mrb_read_irep_file(mrb, fp), c);

}

MRB_API mrb_value

mrb_load_irep_file(mrb_state *mrb, FILE* fp)

{

return mrb_load_irep_file_cxt(mrb, fp, NULL);

}

#endif /* MRB_DISABLE_STDIO */

mruby/src/load.c at stable · jasl/mruby · GitHub

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