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/*
* upb - a minimalist implementation of protocol buffers.
*
* Copyright (c) 2010 Google Inc. See LICENSE for details.
* Author: Josh Haberman <jhaberman@gmail.com>
*
* Data structure for storing a message of protobuf data.
*/
#include "upb_msg.h"
static uint32_t upb_round_up_pow2(uint32_t v) {
// http://graphics.stanford.edu/~seander/bithacks.html#RoundUpPowerOf2
v--;
v |= v >> 1;
v |= v >> 2;
v |= v >> 4;
v |= v >> 8;
v |= v >> 16;
v++;
return v;
}
static void upb_elem_free(upb_value v, upb_fielddef *f) {
switch(f->type) {
case UPB_TYPE(MESSAGE):
case UPB_TYPE(GROUP):
_upb_msg_free(upb_value_getmsg(v), upb_downcast_msgdef(f->def));
break;
case UPB_TYPE(STRING):
case UPB_TYPE(BYTES):
_upb_string_free(upb_value_getstr(v));
break;
default:
abort();
}
}
static void upb_elem_unref(upb_value v, upb_fielddef *f) {
assert(upb_elem_ismm(f));
upb_atomic_t *refcount = upb_value_getrefcount(v);
if (refcount && upb_atomic_unref(refcount))
upb_elem_free(v, f);
}
static void upb_field_free(upb_value v, upb_fielddef *f) {
if (upb_isarray(f)) {
_upb_array_free(upb_value_getarr(v), f);
} else {
upb_elem_free(v, f);
}
}
static void upb_field_unref(upb_value v, upb_fielddef *f) {
assert(upb_field_ismm(f));
upb_atomic_t *refcount = upb_value_getrefcount(v);
if (refcount && upb_atomic_unref(refcount))
upb_field_free(v, f);
}
/* upb_array ******************************************************************/
upb_array *upb_array_new(void) {
upb_array *arr = malloc(sizeof(*arr));
upb_atomic_init(&arr->refcount, 1);
arr->size = 0;
arr->len = 0;
arr->ptr = NULL;
return arr;
}
void __attribute__((noinline)) upb_array_dorecycle(upb_array **_arr) {
upb_array *arr = *_arr;
if(arr && upb_atomic_only(&arr->refcount)) {
arr->len = 0;
} else {
if (arr) {
bool was_lastref = upb_atomic_unref(&arr->refcount);
(void)was_lastref;
assert(!was_lastref); // If it was, we would have just recycled.
}
*_arr = upb_array_new();
}
}
void upb_array_recycle(upb_array **_arr) {
upb_array *arr = *_arr;
if(arr && upb_atomic_only(&arr->refcount)) {
arr->len = 0;
} else {
upb_array_dorecycle(_arr);
}
}
void _upb_array_free(upb_array *arr, upb_fielddef *f) {
if (upb_elem_ismm(f)) {
// Need to release refs on sub-objects.
upb_valuetype_t type = upb_elem_valuetype(f);
for (int32_t i = 0; i < arr->size; i++) {
upb_valueptr p = _upb_array_getptr(arr, f, i);
upb_elem_unref(upb_value_read(p, type), f);
}
}
free(arr->ptr);
free(arr);
}
void __attribute__((noinline)) upb_array_doresize(
upb_array *arr, size_t type_size, upb_arraylen_t len) {
upb_arraylen_t old_size = arr->size;
size_t new_size = upb_round_up_pow2(len);
arr->ptr = realloc(arr->ptr, new_size * type_size);
arr->size = new_size;
memset(arr->ptr + (old_size * type_size), 0,
(new_size - old_size) * type_size);
}
void upb_array_resizefortypesize(upb_array *arr, size_t type_size,
int32_t len) {
assert(len >= 0);
if (arr->size < len) upb_array_doresize(arr, type_size, len);
arr->len = len;
}
void upb_array_resize(upb_array *arr, upb_fielddef *f, upb_arraylen_t len) {
upb_array_resizefortypesize(arr, upb_types[f->type].size, len);
}
/* upb_msg ********************************************************************/
upb_msg *upb_msg_new(upb_msgdef *md) {
upb_msg *msg = malloc(md->size);
// Clear all set bits and cached pointers.
memset(msg, 0, md->size);
upb_atomic_init(&msg->refcount, 1);
return msg;
}
void _upb_msg_free(upb_msg *msg, upb_msgdef *md) {
// Need to release refs on all sub-objects.
upb_msg_iter i;
for(i = upb_msg_begin(md); !upb_msg_done(i); i = upb_msg_next(md, i)) {
upb_fielddef *f = upb_msg_iter_field(i);
upb_valueptr p = _upb_msg_getptr(msg, f);
upb_valuetype_t type = upb_field_valuetype(f);
if (upb_field_ismm(f)) upb_field_unref(upb_value_read(p, type), f);
}
free(msg);
}
void upb_msg_recycle(upb_msg **_msg, upb_msgdef *msgdef) {
upb_msg *msg = *_msg;
if(msg && upb_atomic_only(&msg->refcount)) {
upb_msg_clear(msg, msgdef);
} else {
upb_msg_unref(msg, msgdef);
if (msg) {
bool was_lastref = upb_atomic_unref(&msg->refcount);
(void)was_lastref;
assert(!was_lastref);
}
*_msg = upb_msg_new(msgdef);
}
}
INLINE void upb_msg_sethas(upb_msg *msg, upb_fielddef *f) {
msg->data[f->set_bit_offset] |= f->set_bit_mask;
}
void upb_msg_set(upb_msg *msg, upb_fielddef *f, upb_value val) {
assert(val.type == upb_types[upb_field_valuetype(f)].inmemory_type);
upb_valueptr ptr = _upb_msg_getptr(msg, f);
if (upb_field_ismm(f)) {
// Unref any previous value we may have had there.
upb_value oldval = upb_value_read(ptr, upb_field_valuetype(f));
upb_field_unref(oldval, f);
// Ref the new value.
upb_atomic_t *refcount = upb_value_getrefcount(val);
if (refcount) upb_atomic_ref(refcount);
}
upb_msg_sethas(msg, f);
return upb_value_write(ptr, val, upb_field_valuetype(f));
}
upb_value upb_msg_get(upb_msg *msg, upb_fielddef *f) {
if (!upb_msg_has(msg, f)) {
upb_value val = f->default_value;
if (upb_issubmsg(f)) {
// TODO: handle arrays also, which must be treated similarly.
upb_msgdef *md = upb_downcast_msgdef(f->def);
upb_msg *m = upb_msg_new(md);
// Copy all set bits and values, except the refcount.
memcpy(m , upb_value_getmsg(val), md->size);
upb_atomic_init(&m->refcount, 0); // The msg will take a ref.
upb_value_setmsg(&val, m);
}
upb_msg_set(msg, f, val);
return val;
} else {
return upb_value_read(_upb_msg_getptr(msg, f), upb_field_valuetype(f));
}
}
static upb_flow_t upb_msg_dispatch(upb_msg *msg, upb_msgdef *md,
upb_dispatcher *d);
static upb_flow_t upb_msg_pushval(upb_value val, upb_fielddef *f,
upb_dispatcher *d, upb_fhandlers *hf) {
if (upb_issubmsg(f)) {
upb_msg *msg = upb_value_getmsg(val);
upb_dispatch_startsubmsg(d, hf);
upb_msg_dispatch(msg, upb_downcast_msgdef(f->def), d);
upb_dispatch_endsubmsg(d);
} else {
upb_dispatch_value(d, hf, val);
}
return UPB_CONTINUE;
}
static upb_flow_t upb_msg_dispatch(upb_msg *msg, upb_msgdef *md,
upb_dispatcher *d) {
upb_msg_iter i;
for(i = upb_msg_begin(md); !upb_msg_done(i); i = upb_msg_next(md, i)) {
upb_fielddef *f = upb_msg_iter_field(i);
if (!upb_msg_has(msg, f)) continue;
upb_fhandlers *hf = upb_dispatcher_lookup(d, f->number);
if (!hf) continue;
upb_value val = upb_msg_get(msg, f);
if (upb_isarray(f)) {
upb_array *arr = upb_value_getarr(val);
for (uint32_t j = 0; j < upb_array_len(arr); ++j) {
upb_msg_pushval(upb_array_get(arr, f, j), f, d, hf);
}
} else {
upb_msg_pushval(val, f, d, hf);
}
}
return UPB_CONTINUE;
}
void upb_msg_runhandlers(upb_msg *msg, upb_msgdef *md, upb_handlers *h,
void *closure, upb_status *status) {
upb_dispatcher d;
upb_dispatcher_init(&d, h, NULL, NULL, NULL);
upb_dispatcher_reset(&d, closure);
upb_dispatch_startmsg(&d);
upb_msg_dispatch(msg, md, &d);
upb_dispatch_endmsg(&d, status);
upb_dispatcher_uninit(&d);
}
static upb_valueptr upb_msg_getappendptr(upb_msg *msg, upb_fielddef *f) {
upb_valueptr p = _upb_msg_getptr(msg, f);
if (upb_isarray(f)) {
// Create/recycle/resize the array if necessary, and find a pointer to
// a newly-appended element.
if (!upb_msg_has(msg, f)) {
upb_array_recycle(p.arr);
upb_msg_sethas(msg, f);
}
assert(*p.arr != NULL);
upb_arraylen_t oldlen = upb_array_len(*p.arr);
upb_array_resize(*p.arr, f, oldlen + 1);
p = _upb_array_getptr(*p.arr, f, oldlen);
}
return p;
}
upb_msg *upb_msg_appendmsg(upb_msg *msg, upb_fielddef *f, upb_msgdef *msgdef) {
upb_valueptr p = upb_msg_getappendptr(msg, f);
if (upb_isarray(f) || !upb_msg_has(msg, f)) {
upb_msg_recycle(p.msg, msgdef);
upb_msg_sethas(msg, f);
}
return *p.msg;
}
/* upb_msg handlers ***********************************************************/
#if UPB_MAX_FIELDS > 2048
#error "We're using an 8-bit integer to store a has_offset."
#endif
typedef struct {
uint8_t has_offset;
uint8_t has_mask;
uint16_t val_offset;
uint16_t msg_size;
uint8_t set_flags_bytes;
uint8_t padding;
} upb_msgsink_fval;
static upb_msgsink_fval upb_msgsink_unpackfval(upb_value fval) {
assert(sizeof(upb_msgsink_fval) == 8);
upb_msgsink_fval ret;
uint64_t fval_u64 = upb_value_getuint64(fval);
memcpy(&ret, &fval_u64, 8);
return ret;
}
static uint64_t upb_msgsink_packfval(uint8_t has_offset, uint8_t has_mask,
uint16_t val_offset, uint16_t msg_size,
uint8_t set_flags_bytes) {
upb_msgsink_fval fval = {
has_offset, has_mask, val_offset, msg_size, set_flags_bytes, 0};
uint64_t ret = 0;
memcpy(&ret, &fval, sizeof(fval));
return ret;
}
#define SCALAR_VALUE_CB_PAIR(type, ctype) \
upb_flow_t upb_msgsink_ ## type ## value(void *_m, upb_value _fval, \
upb_value val) { \
upb_msg *m = _m; \
upb_msgsink_fval fval = upb_msgsink_unpackfval(_fval); \
m->data[fval.has_offset] |= fval.has_mask; \
*(ctype*)&m->data[fval.val_offset] = upb_value_get ## type(val); \
return UPB_CONTINUE; \
} \
\
upb_flow_t upb_msgsink_ ## type ## value_r(void *_a, upb_value _fval, \
upb_value val) { \
(void)_fval; \
upb_array *arr = _a; \
upb_array_resizefortypesize(arr, sizeof(ctype), arr->len+1); \
upb_valueptr p = _upb_array_getptrforsize(arr, sizeof(ctype), \
arr->len-1); \
*(ctype*)p._void = upb_value_get ## type(val); \
return UPB_CONTINUE; \
} \
SCALAR_VALUE_CB_PAIR(double, double)
SCALAR_VALUE_CB_PAIR(float, float)
SCALAR_VALUE_CB_PAIR(int32, int32_t)
SCALAR_VALUE_CB_PAIR(int64, int64_t)
SCALAR_VALUE_CB_PAIR(uint32, uint32_t)
SCALAR_VALUE_CB_PAIR(uint64, uint64_t)
SCALAR_VALUE_CB_PAIR(bool, bool)
upb_sflow_t upb_msgsink_startseq(void *_m, upb_value _fval) {
upb_msg *m = _m;
upb_msgsink_fval fval = upb_msgsink_unpackfval(_fval);
upb_array **arr = (upb_array**)&m->data[fval.val_offset];
if (!(m->data[fval.has_offset] & fval.has_mask)) {
upb_array_recycle(arr);
m->data[fval.has_offset] |= fval.has_mask;
}
return UPB_CONTINUE_WITH(*arr);
}
upb_flow_t upb_msgsink_strvalue(void *_m, upb_value _fval, upb_value val) {
upb_msg *m = _m;
upb_msgsink_fval fval = upb_msgsink_unpackfval(_fval);
m->data[fval.has_offset] |= fval.has_mask;
// We do:
// - upb_string_recycle(), upb_string_substr() instead of
// - upb_string_unref(), upb_string_getref()
// because we can conveniently cache these upb_string objects in the
// upb_msg, whereas the upb_src who is sending us these strings may not
// have a good way of caching them. This saves the upb_src from allocating
// new upb_strings all the time to give us.
//
// If you were using this to copy one upb_msg to another this would
// allocate string objects whereas a upb_string_getref could have avoided
// those allocations completely; if this is an issue, we could make it an
// option of the upb_msgsink which behavior is desired.
upb_string *src = upb_value_getstr(val);
upb_string **dst = (void*)&m->data[fval.val_offset];
upb_string_recycle(dst);
upb_string_substr(*dst, src, 0, upb_string_len(src));
return UPB_CONTINUE;
}
upb_flow_t upb_msgsink_strvalue_r(void *_a, upb_value _fval,
upb_value val) {
upb_array *arr = _a;
(void)_fval;
upb_array_resizefortypesize(arr, sizeof(void*), arr->len+1);
upb_valueptr p = _upb_array_getptrforsize(arr, sizeof(void*),
upb_array_len(arr)-1);
upb_string *src = upb_value_getstr(val);
upb_string_recycle(p.str);
upb_string_substr(*p.str, src, 0, upb_string_len(src));
return UPB_CONTINUE;
}
upb_sflow_t upb_msgsink_startsubmsg(void *_m, upb_value _fval) {
upb_msg *msg = _m;
upb_msgsink_fval fval = upb_msgsink_unpackfval(_fval);
upb_msgdef md;
md.size = fval.msg_size;
md.set_flags_bytes = fval.set_flags_bytes;
upb_fielddef f;
f.set_bit_mask = fval.has_mask;
f.set_bit_offset = fval.has_offset;
f.label = UPB_LABEL(OPTIONAL); // Just not repeated.
f.type = UPB_TYPE(MESSAGE);
f.byte_offset = fval.val_offset;
upb_msg **subm = _upb_msg_getptr(msg, &f).msg;
if (!upb_msg_has(msg, &f)) {
upb_msg_recycle(subm, &md);
upb_msg_sethas(msg, &f);
}
return UPB_CONTINUE_WITH(*subm);
}
upb_sflow_t upb_msgsink_startsubmsg_r(void *_a, upb_value _fval) {
upb_array *a = _a;
assert(a != NULL);
upb_msgsink_fval fval = upb_msgsink_unpackfval(_fval);
upb_msgdef md;
md.size = fval.msg_size;
md.set_flags_bytes = fval.set_flags_bytes;
upb_fielddef f;
f.set_bit_mask = fval.has_mask;
f.set_bit_offset = fval.has_offset;
f.label = UPB_LABEL(REPEATED);
f.type = UPB_TYPE(MESSAGE);
f.byte_offset = fval.val_offset;
upb_arraylen_t oldlen = upb_array_len(a);
upb_array_resize(a, &f, oldlen + 1);
upb_valueptr p = _upb_array_getptr(a, &f, oldlen);
upb_msg_recycle(p.msg, &md);
return UPB_CONTINUE_WITH(*p.msg);
}
INLINE void upb_msg_onfreg(void *c, upb_fhandlers *fh, upb_fielddef *f) {
(void)c;
uint16_t msg_size = 0;
uint8_t set_flags_bytes = 0;
if (upb_issubmsg(f)) {
upb_msgdef *md = upb_downcast_msgdef(f->def);
msg_size = md->size;
set_flags_bytes = md->set_flags_bytes;
}
upb_value_setuint64(&fh->fval,
upb_msgsink_packfval(f->set_bit_offset, f->set_bit_mask,
f->byte_offset, msg_size, set_flags_bytes));
if (fh->repeated) upb_fhandlers_setstartseq(fh, upb_msgsink_startseq);
#define CASE(upb_type, type) \
case UPB_TYPE(upb_type): \
upb_fhandlers_setvalue(fh, upb_isarray(f) ? \
upb_msgsink_ ## type ## value_r : upb_msgsink_ ## type ## value); \
break;
switch (f->type) {
CASE(DOUBLE, double)
CASE(FLOAT, float)
CASE(INT32, int32)
CASE(INT64, int64)
CASE(UINT32, uint32)
CASE(UINT64, uint64)
CASE(SINT32, int32)
CASE(SINT64, int64)
CASE(FIXED32, uint32)
CASE(FIXED64, uint64)
CASE(SFIXED32, int32)
CASE(SFIXED64, int64)
CASE(BOOL, bool)
CASE(ENUM, int32)
CASE(STRING, str)
CASE(BYTES, str)
#undef CASE
case UPB_TYPE(MESSAGE):
case UPB_TYPE(GROUP):
upb_fhandlers_setstartsubmsg(fh,
upb_isarray(f) ? upb_msgsink_startsubmsg_r : upb_msgsink_startsubmsg);
break;
}
}
upb_mhandlers *upb_msg_reghandlers(upb_handlers *h, upb_msgdef *m) {
return upb_handlers_regmsgdef(h, m, NULL, &upb_msg_onfreg, NULL);
}
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