diff options
author | Sverker Eriksson <sverker@erlang.org> | 2010-11-02 18:08:04 +0100 |
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committer | Sverker Eriksson <sverker@erlang.org> | 2010-11-22 15:54:48 +0100 |
commit | 454335cd043561cc9fe874bc325c152a0727328b (patch) | |
tree | c12359d358fd8664bb5eb3b22cac80c5a8880e77 /erts/emulator/beam/external.c | |
parent | 7ceec2cef3643f2c2f63ae169f74da660803435b (diff) | |
download | otp-454335cd043561cc9fe874bc325c152a0727328b.tar.gz otp-454335cd043561cc9fe874bc325c152a0727328b.tar.bz2 otp-454335cd043561cc9fe874bc325c152a0727328b.zip |
ETS 'compressed' option.
The compressed format is using a slighty modified variant of the extern format
(term_to_binary). To not worsen key lookup's too much, the top tuple itself
and the key element are not compressed. Table objects with only immediate
non-key elements will therefor not gain anything (but actually consume one
extra word for "alloc_size").
Diffstat (limited to 'erts/emulator/beam/external.c')
-rw-r--r-- | erts/emulator/beam/external.c | 329 |
1 files changed, 277 insertions, 52 deletions
diff --git a/erts/emulator/beam/external.c b/erts/emulator/beam/external.c index d7c8aa84e9..328aa2be6a 100644 --- a/erts/emulator/beam/external.c +++ b/erts/emulator/beam/external.c @@ -49,10 +49,8 @@ #define in_area(ptr,start,nbytes) ((Uint)((char*)(ptr) - (char*)(start)) < (nbytes)) #define MAX_STRING_LEN 0xffff -#define dec_set_creation(nodename,creat) \ - (((nodename) == erts_this_node->sysname && (creat) == ORIG_CREATION) \ - ? erts_this_node->creation \ - : (creat)) + +#define is_valid_creation(Cre) ((unsigned)(Cre) < MAX_CREATION || (Cre) == INTERNAL_CREATION) #undef ERTS_DEBUG_USE_DIST_SEP #ifdef DEBUG @@ -83,14 +81,14 @@ * */ -static byte* enc_term(ErtsAtomCacheMap *, Eterm, byte*, Uint32); +static byte* enc_term(ErtsAtomCacheMap *, Eterm, byte*, Uint32, struct erl_off_heap_header** off_heap); static Uint is_external_string(Eterm obj, int* p_is_string); static byte* enc_atom(ErtsAtomCacheMap *, Eterm, byte*, Uint32); static byte* enc_pid(ErtsAtomCacheMap *, Eterm, byte*, Uint32); static byte* dec_term(ErtsDistExternal *, Eterm**, byte*, ErlOffHeap*, Eterm*); static byte* dec_atom(ErtsDistExternal *, byte*, Eterm*); static byte* dec_pid(ErtsDistExternal *, Eterm**, byte*, ErlOffHeap*, Eterm*); -static Sint decoded_size(byte *ep, byte* endp, int only_heap_bins); +static Sint decoded_size(byte *ep, byte* endp, int only_heap_bins, int internal_tags); static Uint encode_size_struct2(ErtsAtomCacheMap *, Eterm, unsigned); @@ -461,6 +459,12 @@ Uint erts_encode_ext_size(Eterm term) + 1 /* VERSION_MAGIC */; } +Uint erts_encode_ext_size_ets(Eterm term) +{ + return encode_size_struct2(NULL, term, TERM_TO_BINARY_DFLAGS|DFLAGS_INTERNAL_TAGS); +} + + void erts_encode_dist_ext(Eterm term, byte **ext, Uint32 flags, ErtsAtomCacheMap *acmp) { byte *ep = *ext; @@ -468,7 +472,7 @@ void erts_encode_dist_ext(Eterm term, byte **ext, Uint32 flags, ErtsAtomCacheMap if (!(flags & DFLAG_DIST_HDR_ATOM_CACHE)) #endif *ep++ = VERSION_MAGIC; - ep = enc_term(acmp, term, ep, flags); + ep = enc_term(acmp, term, ep, flags, NULL); if (!ep) erl_exit(ERTS_ABORT_EXIT, "%s:%d:erts_encode_dist_ext(): Internal data structure error\n", @@ -480,7 +484,7 @@ void erts_encode_ext(Eterm term, byte **ext) { byte *ep = *ext; *ep++ = VERSION_MAGIC; - ep = enc_term(NULL, term, ep, TERM_TO_BINARY_DFLAGS); + ep = enc_term(NULL, term, ep, TERM_TO_BINARY_DFLAGS, NULL); if (!ep) erl_exit(ERTS_ABORT_EXIT, "%s:%d:erts_encode_ext(): Internal data structure error\n", @@ -488,6 +492,12 @@ void erts_encode_ext(Eterm term, byte **ext) *ext = ep; } +byte* erts_encode_ext_ets(Eterm term, byte *ep, struct erl_off_heap_header** off_heap) +{ + return enc_term(NULL, term, ep, TERM_TO_BINARY_DFLAGS|DFLAGS_INTERNAL_TAGS, + off_heap); +} + ErtsDistExternal * erts_make_dist_ext_copy(ErtsDistExternal *edep, Uint xsize) { @@ -813,7 +823,7 @@ erts_decode_dist_ext_size(ErtsDistExternal *edep, int no_refc_bins) goto fail; ep = edep->extp+1; } - res = decoded_size(ep, edep->ext_endp, no_refc_bins); + res = decoded_size(ep, edep->ext_endp, no_refc_bins, 0); if (res >= 0) return res; fail: @@ -825,9 +835,17 @@ Sint erts_decode_ext_size(byte *ext, Uint size, int no_refc_bins) { if (size == 0 || *ext != VERSION_MAGIC) return -1; - return decoded_size(ext+1, ext+size, no_refc_bins); + return decoded_size(ext+1, ext+size, no_refc_bins, 0); } +Sint erts_decode_ext_size_ets(byte *ext, Uint size) +{ + Sint sz = decoded_size(ext, ext+size, 0, 1); + ASSERT(sz >= 0); + return sz; +} + + /* ** hpp is set to either a &p->htop or ** a pointer to a memory pointer (form message buffers) @@ -887,7 +905,13 @@ Eterm erts_decode_ext(Eterm **hpp, ErlOffHeap *off_heap, byte **ext) return obj; } - +Eterm erts_decode_ext_ets(Eterm **hpp, ErlOffHeap *off_heap, byte *ext) +{ + Eterm obj; + ext = dec_term(NULL, hpp, ext, off_heap, &obj); + ASSERT(ext); + return obj; +} /**********************************************************************/ @@ -964,6 +988,7 @@ term_to_binary_1(Process* p, Eterm Term) return erts_term_to_binary(p, Term, 0, TERM_TO_BINARY_DFLAGS); } + Eterm term_to_binary_2(Process* p, Eterm Term, Eterm Flags) { @@ -1075,7 +1100,7 @@ binary2term_prepare(ErtsBinary2TermState *state, byte *data, Sint data_size) goto error; size = (Sint) dest_len; } - res = decoded_size(state->extp, state->extp + size, 0); + res = decoded_size(state->extp, state->extp + size, 0, 0); if (res < 0) goto error; return res; @@ -1183,7 +1208,8 @@ BIF_RETTYPE binary_to_term_2(BIF_ALIST_2) opt = CAR(list_val(opts)); if (opt == am_safe) { fakedep.flags |= ERTS_DIST_EXT_BTT_SAFE; - } else { + } + else { goto error; } opts = CDR(list_val(opts)); @@ -1255,7 +1281,7 @@ erts_term_to_binary(Process* p, Eterm Term, int level, Uint flags) bytes = erts_alloc(ERTS_ALC_T_TMP, size); } - if ((endp = enc_term(NULL, Term, bytes, flags)) + if ((endp = enc_term(NULL, Term, bytes, flags, NULL)) == NULL) { erl_exit(1, "%s, line %d: bad term: %x\n", __FILE__, __LINE__, Term); @@ -1300,7 +1326,7 @@ erts_term_to_binary(Process* p, Eterm Term, int level, Uint flags) bin = new_binary(p, (byte *)NULL, size); bytes = binary_bytes(bin); bytes[0] = VERSION_MAGIC; - if ((endp = enc_term(NULL, Term, bytes+1, flags)) + if ((endp = enc_term(NULL, Term, bytes+1, flags, NULL)) == NULL) { erl_exit(1, "%s, line %d: bad term: %x\n", __FILE__, __LINE__, Term); @@ -1330,6 +1356,21 @@ enc_atom(ErtsAtomCacheMap *acmp, Eterm atom, byte *ep, Uint32 dflags) ASSERT(is_atom(atom)); + if (dflags & DFLAGS_INTERNAL_TAGS) { + Uint aval = atom_val(atom); + ASSERT(aval < (1<<24)); + if (aval >= (1 << 16)) { + *ep++ = ATOM_INTERNAL_REF3; + put_int24(aval, ep); + ep += 3; + } + else { + *ep++ = ATOM_INTERNAL_REF2; + put_int16(aval, ep); + ep += 2; + } + return ep; + } /* * term_to_binary/1,2 and the initial distribution message * don't use the cache. @@ -1379,7 +1420,8 @@ enc_pid(ErtsAtomCacheMap *acmp, Eterm pid, byte* ep, Uint32 dflags) ep += 4; put_int32(os, ep); ep += 4; - *ep++ = pid_creation(pid); + *ep++ = (is_internal_pid(pid) && (dflags & DFLAGS_INTERNAL_TAGS)) ? + INTERNAL_CREATION : pid_creation(pid); return ep; } @@ -1418,6 +1460,23 @@ dec_atom(ErtsDistExternal *edep, byte* ep, Eterm* objp) } ep += len; break; + case ATOM_INTERNAL_REF2: + n = get_int16(ep); + ep += 2; + if (n >= atom_table_size()) { + goto error; + } + *objp = make_atom(n); + break; + case ATOM_INTERNAL_REF3: + n = get_int24(ep); + ep += 3; + if (n >= atom_table_size()) { + goto error; + } + *objp = make_atom(n); + break; + default: error: *objp = NIL; /* Don't leave a hole in the heap */ @@ -1426,6 +1485,19 @@ dec_atom(ErtsDistExternal *edep, byte* ep, Eterm* objp) return ep; } +static ERTS_INLINE ErlNode* dec_get_node(Eterm sysname, Uint creation) +{ + switch (creation) { + case INTERNAL_CREATION: + return erts_this_node; + case ORIG_CREATION: + if (sysname == erts_this_node->sysname) { + creation = erts_this_node->creation; + } + } + return erts_find_or_insert_node(sysname,creation); +} + static byte* dec_pid(ErtsDistExternal *edep, Eterm** hpp, byte* ep, ErlOffHeap* off_heap, Eterm* objp) { @@ -1449,18 +1521,20 @@ dec_pid(ErtsDistExternal *edep, Eterm** hpp, byte* ep, ErlOffHeap* off_heap, Ete ep += 4; if (ser > ERTS_MAX_PID_SERIAL) return NULL; - if ((cre = get_int8(ep)) >= MAX_CREATION) - return NULL; + cre = get_int8(ep); ep += 1; + if (!is_valid_creation(cre)) { + return NULL; + } + data = make_pid_data(ser, num); + /* * We are careful to create the node entry only after all * validity tests are done. */ - cre = dec_set_creation(sysname,cre); - node = erts_find_or_insert_node(sysname,cre); + node = dec_get_node(sysname, cre); - data = make_pid_data(ser, num); if(node == erts_this_node) { *objp = make_internal_pid(data); } else { @@ -1485,7 +1559,8 @@ dec_pid(ErtsDistExternal *edep, Eterm** hpp, byte* ep, ErlOffHeap* off_heap, Ete #define ENC_LAST_ARRAY_ELEMENT ((Eterm) 3) static byte* -enc_term(ErtsAtomCacheMap *acmp, Eterm obj, byte* ep, Uint32 dflags) +enc_term(ErtsAtomCacheMap *acmp, Eterm obj, byte* ep, Uint32 dflags, + struct erl_off_heap_header** off_heap) { DECLARE_WSTACK(s); Uint n; @@ -1637,12 +1712,14 @@ enc_term(ErtsAtomCacheMap *acmp, Eterm obj, byte* ep, Uint32 dflags) Uint32 *ref_num; ASSERT(dflags & DFLAG_EXTENDED_REFERENCES); + *ep++ = NEW_REFERENCE_EXT; i = ref_no_of_numbers(obj); put_int16(i, ep); ep += 2; ep = enc_atom(acmp,ref_node_name(obj),ep,dflags); - *ep++ = ref_creation(obj); + *ep++ = ((dflags & DFLAGS_INTERNAL_TAGS) && is_internal_ref(obj)) ? + INTERNAL_CREATION : ref_creation(obj); ref_num = ref_numbers(obj); for (j = 0; j < i; j++) { put_int32(ref_num[j], ep); @@ -1658,7 +1735,8 @@ enc_term(ErtsAtomCacheMap *acmp, Eterm obj, byte* ep, Uint32 dflags) j = port_number(obj); put_int32(j, ep); ep += 4; - *ep++ = port_creation(obj); + *ep++ = ((dflags & DFLAGS_INTERNAL_TAGS) && is_internal_port(obj)) ? + INTERNAL_CREATION : port_creation(obj); break; case LIST_DEF: @@ -1738,6 +1816,41 @@ enc_term(ErtsAtomCacheMap *acmp, Eterm obj, byte* ep, Uint32 dflags) byte* bytes; ERTS_GET_BINARY_BYTES(obj, bytes, bitoffs, bitsize); + if (dflags & DFLAGS_INTERNAL_TAGS) { + ProcBin* pb = (ProcBin*) binary_val(obj); + Uint bytesize = pb->size; + if (pb->thing_word == HEADER_SUB_BIN) { + ErlSubBin* sub = (ErlSubBin*)pb; + pb = (ProcBin*) binary_val(sub->orig); + ASSERT(bytesize == sub->size); + bytesize += (bitoffs + bitsize + 7) / 8; + } + if (pb->thing_word == HEADER_PROC_BIN + && heap_bin_size(bytesize) > PROC_BIN_SIZE) { + ProcBin tmp; + if (bitoffs || bitsize) { + *ep++ = BIT_BINARY_INTERNAL_REF; + *ep++ = bitoffs; + *ep++ = bitsize; + } + else { + *ep++ = BINARY_INTERNAL_REF; + } + if (pb->flags) { + erts_emasculate_writable_binary(pb); + } + erts_refc_inc(&pb->val->refc, 2); + + sys_memcpy(&tmp, pb, sizeof(ProcBin)); + tmp.next = *off_heap; + tmp.bytes = bytes; + tmp.size = bytesize; + sys_memcpy(ep, &tmp, sizeof(ProcBin)); + *off_heap = (struct erl_off_heap_header*) ep; + ep += sizeof(ProcBin); + break; + } + } if (bitsize == 0) { /* Plain old byte-sized binary. */ *ep++ = BINARY_EXT; @@ -1773,8 +1886,8 @@ enc_term(ErtsAtomCacheMap *acmp, Eterm obj, byte* ep, Uint32 dflags) *ep++ = SMALL_INTEGER_EXT; *ep++ = bitsize; } - break; } + break; case EXPORT_DEF: { Export* exp = *((Export **) (export_val(obj) + 1)); @@ -1782,7 +1895,7 @@ enc_term(ErtsAtomCacheMap *acmp, Eterm obj, byte* ep, Uint32 dflags) *ep++ = EXPORT_EXT; ep = enc_atom(acmp, exp->code[0], ep, dflags); ep = enc_atom(acmp, exp->code[1], ep, dflags); - ep = enc_term(acmp, make_small(exp->code[2]), ep, dflags); + ep = enc_term(acmp, make_small(exp->code[2]), ep, dflags, off_heap); } else { /* Tag, arity */ *ep++ = SMALL_TUPLE_EXT; @@ -1818,8 +1931,8 @@ enc_term(ErtsAtomCacheMap *acmp, Eterm obj, byte* ep, Uint32 dflags) put_int32(funp->num_free, ep); ep += 4; ep = enc_atom(acmp, funp->fe->module, ep, dflags); - ep = enc_term(acmp, make_small(funp->fe->old_index), ep, dflags); - ep = enc_term(acmp, make_small(funp->fe->old_uniq), ep, dflags); + ep = enc_term(acmp, make_small(funp->fe->old_index), ep, dflags, off_heap); + ep = enc_term(acmp, make_small(funp->fe->old_uniq), ep, dflags, off_heap); ep = enc_pid(acmp, funp->creator, ep, dflags); fun_env: @@ -1872,7 +1985,8 @@ enc_term(ErtsAtomCacheMap *acmp, Eterm obj, byte* ep, Uint32 dflags) return ep; } -static Uint +static +Uint is_external_string(Eterm list, int* p_is_string) { Uint len = 0; @@ -2162,13 +2276,13 @@ dec_term_atom_common: goto error; } ep += 4; - if ((cre = get_int8(ep)) >= MAX_CREATION) { + cre = get_int8(ep); + ep++; + if (!is_valid_creation(cre)) { goto error; } - ep++; - cre = dec_set_creation(sysname,cre); - node = erts_find_or_insert_node(sysname, cre); + node = dec_get_node(sysname, cre); if(node == erts_this_node) { *objp = make_internal_port(num); } @@ -2205,9 +2319,11 @@ dec_term_atom_common: goto error; ep += 4; - if ((cre = get_int8(ep)) >= MAX_CREATION) - goto error; + cre = get_int8(ep); ep += 1; + if (!is_valid_creation(cre)) { + goto error; + } goto ref_ext_common; case NEW_REFERENCE_EXT: @@ -2220,10 +2336,11 @@ dec_term_atom_common: if ((ep = dec_atom(edep, ep, &sysname)) == NULL) goto error; - if ((cre = get_int8(ep)) >= MAX_CREATION) - goto error; + cre = get_int8(ep); ep += 1; - + if (!is_valid_creation(cre)) { + goto error; + } r0 = get_int32(ep); ep += 4; if (r0 >= MAX_REFERENCE) @@ -2231,8 +2348,7 @@ dec_term_atom_common: ref_ext_common: - cre = dec_set_creation(sysname, cre); - node = erts_find_or_insert_node(sysname, cre); + node = dec_get_node(sysname, cre); if(node == erts_this_node) { RefThing *rtp = (RefThing *) hp; ref_num = (Uint32 *) (hp + REF_THING_HEAD_SIZE); @@ -2560,6 +2676,66 @@ dec_term_atom_common: } break; } + case ATOM_INTERNAL_REF2: + n = get_int16(ep); + ep += 2; + if (n >= atom_table_size()) { + goto error; + } + *objp = make_atom(n); + break; + case ATOM_INTERNAL_REF3: + n = get_int24(ep); + ep += 3; + if (n >= atom_table_size()) { + goto error; + } + *objp = make_atom(n); + break; + + case BINARY_INTERNAL_REF: + { + ProcBin* pb = (ProcBin*) hp; + sys_memcpy(pb, ep, sizeof(ProcBin)); + ep += sizeof(ProcBin); + + erts_refc_inc(&pb->val->refc, 1); + hp += PROC_BIN_SIZE; + pb->next = off_heap->first; + off_heap->first = (struct erl_off_heap_header*)pb; + pb->flags = 0; + *objp = make_binary(pb); + break; + } + case BIT_BINARY_INTERNAL_REF: + { + Sint bitoffs = *ep++; + Sint bitsize = *ep++; + ProcBin* pb = (ProcBin*) hp; + ErlSubBin* sub; + sys_memcpy(pb, ep, sizeof(ProcBin)); + ep += sizeof(ProcBin); + + erts_refc_inc(&pb->val->refc, 1); + hp += PROC_BIN_SIZE; + pb->next = off_heap->first; + off_heap->first = (struct erl_off_heap_header*)pb; + pb->flags = 0; + + sub = (ErlSubBin*)hp; + sub->thing_word = HEADER_SUB_BIN; + sub->size = pb->size - (bitoffs + bitsize + 7)/8; + sub->offs = 0; + sub->bitoffs = bitoffs; + sub->bitsize = bitsize; + sub->is_writable = 0; + sub->orig = make_binary(pb); + + hp += ERL_SUB_BIN_SIZE; + *objp = make_binary(sub); + break; + } + default: error: /* UNDO: @@ -2642,20 +2818,29 @@ encode_size_struct2(ErtsAtomCacheMap *acmp, Eterm obj, unsigned dflags) case NIL_DEF: result++; break; - case ATOM_DEF: { - int alen = atom_tab(atom_val(obj))->len; - if ((MAX_ATOM_LENGTH <= 255 || alen <= 255) - && (dflags & DFLAG_SMALL_ATOM_TAGS)) { - /* Make sure a SMALL_ATOM_EXT fits: SMALL_ATOM_EXT l t1 t2... */ - result += 1 + 1 + alen; + case ATOM_DEF: + if (dflags & DFLAGS_INTERNAL_TAGS) { + if (atom_val(obj) >= (1<<16)) { + result += 1 + 3; + } + else { + result += 1 + 2; + } } else { - /* Make sure an ATOM_EXT fits: ATOM_EXT l1 l0 t1 t2... */ - result += 1 + 2 + alen; + int alen = atom_tab(atom_val(obj))->len; + if ((MAX_ATOM_LENGTH <= 255 || alen <= 255) + && (dflags & DFLAG_SMALL_ATOM_TAGS)) { + /* Make sure a SMALL_ATOM_EXT fits: SMALL_ATOM_EXT l t1 t2... */ + result += 1 + 1 + alen; + } + else { + /* Make sure an ATOM_EXT fits: ATOM_EXT l1 l0 t1 t2... */ + result += 1 + 2 + alen; + } + insert_acache_map(acmp, obj); } - insert_acache_map(acmp, obj); break; - } case SMALL_DEF: { Sint val = signed_val(obj); @@ -2734,8 +2919,25 @@ encode_size_struct2(ErtsAtomCacheMap *acmp, Eterm obj, unsigned dflags) } break; case BINARY_DEF: + if (dflags & DFLAGS_INTERNAL_TAGS) { + ProcBin* pb = (ProcBin*) binary_val(obj); + Uint sub_extra = 0; + Uint tot_bytes = pb->size; + if (pb->thing_word == HEADER_SUB_BIN) { + ErlSubBin* sub = (ErlSubBin*) pb; + pb = (ProcBin*) binary_val(sub->orig); + sub_extra = 2; /* bitoffs and bitsize */ + tot_bytes += (sub->bitoffs + sub->bitsize+ 7) / 8; + } + if (pb->thing_word == HEADER_PROC_BIN + && heap_bin_size(tot_bytes) > PROC_BIN_SIZE) { + + result += 1 + sub_extra + sizeof(ProcBin); + break; + } + } result += 1 + 4 + binary_size(obj) + - 5; /* For unaligned binary */ + 5; /* For unaligned binary */ break; case FUN_DEF: { @@ -2807,7 +3009,7 @@ encode_size_struct2(ErtsAtomCacheMap *acmp, Eterm obj, unsigned dflags) } static Sint -decoded_size(byte *ep, byte* endp, int no_refc_bins) +decoded_size(byte *ep, byte* endp, int no_refc_bins, int internal_tags) { int heap_size = 0; int terms; @@ -3017,6 +3219,29 @@ decoded_size(byte *ep, byte* endp, int no_refc_bins) heap_size += ERL_FUN_SIZE + num_free; break; } + case ATOM_INTERNAL_REF2: + SKIP(2+atom_extra_skip); + atom_extra_skip = 0; + break; + case ATOM_INTERNAL_REF3: + SKIP(3+atom_extra_skip); + atom_extra_skip = 0; + break; + + case BINARY_INTERNAL_REF: + if (!internal_tags) { + return -1; + } + SKIP(sizeof(ProcBin)); + heap_size += PROC_BIN_SIZE; + break; + case BIT_BINARY_INTERNAL_REF: + if (!internal_tags) { + return -1; + } + SKIP(2+sizeof(ProcBin)); + heap_size += PROC_BIN_SIZE + ERL_SUB_BIN_SIZE; + break; default: return -1; } |