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author | Sverker Eriksson <[email protected]> | 2010-11-24 10:53:56 +0100 |
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committer | Sverker Eriksson <[email protected]> | 2011-02-03 17:33:43 +0100 |
commit | fff4ba0282e42e2942acebff9c10a274075c1c62 (patch) | |
tree | a3a73ded3d31a4944c6208167e286759d75e5040 /erts/emulator/beam/copy.c | |
parent | 62dad961329a603110ce0e1d3f62554cc5228152 (diff) | |
download | otp-fff4ba0282e42e2942acebff9c10a274075c1c62.tar.gz otp-fff4ba0282e42e2942acebff9c10a274075c1c62.tar.bz2 otp-fff4ba0282e42e2942acebff9c10a274075c1c62.zip |
HALFWORD ETS relative terms
In halfword emulator, make ETS use a variant of the internal term
format that uses relative offsets instead of absolute pointers. This
will allow storage in high memory (>4G). Preprocessor macros (like
list_val_rel(TERM,BASE)) are used to make normal (fullword) emulator
almost completely unchanged while still reusing most of the code.
Diffstat (limited to 'erts/emulator/beam/copy.c')
-rw-r--r-- | erts/emulator/beam/copy.c | 111 |
1 files changed, 74 insertions, 37 deletions
diff --git a/erts/emulator/beam/copy.c b/erts/emulator/beam/copy.c index 8bee47232e..d582b479cc 100644 --- a/erts/emulator/beam/copy.c +++ b/erts/emulator/beam/copy.c @@ -72,8 +72,11 @@ copy_object(Eterm obj, Process* to) * Return the "flat" size of the object. */ -Uint -size_object(Eterm obj) +#if HALFWORD_HEAP +Uint size_object_rel(Eterm obj, Eterm* base) +#else +Uint size_object(Eterm obj) +#endif { Uint sum = 0; Eterm* ptr; @@ -84,7 +87,7 @@ size_object(Eterm obj) switch (primary_tag(obj)) { case TAG_PRIMARY_LIST: sum += 2; - ptr = list_val(obj); + ptr = list_val_rel(obj,base); obj = *ptr++; if (!IS_CONST(obj)) { ESTACK_PUSH(s, obj); @@ -93,11 +96,11 @@ size_object(Eterm obj) break; case TAG_PRIMARY_BOXED: { - Eterm hdr = *boxed_val(obj); + Eterm hdr = *boxed_val_rel(obj,base); ASSERT(is_header(hdr)); switch (hdr & _TAG_HEADER_MASK) { case ARITYVAL_SUBTAG: - ptr = tuple_val(obj); + ptr = tuple_val_rel(obj,base); arity = header_arity(hdr); sum += arity + 1; if (arity == 0) { /* Empty tuple -- unusual. */ @@ -113,7 +116,7 @@ size_object(Eterm obj) break; case FUN_SUBTAG: { - Eterm* bptr = fun_val(obj); + Eterm* bptr = fun_val_rel(obj,base); ErlFunThing* funp = (ErlFunThing *) bptr; unsigned eterms = 1 /* creator */ + funp->num_free; unsigned sz = thing_arityval(hdr); @@ -136,7 +139,7 @@ size_object(Eterm obj) Uint bitoffs; Uint extra_bytes; Eterm hdr; - ERTS_GET_REAL_BIN(obj, real_bin, offset, bitoffs, bitsize); + ERTS_GET_REAL_BIN_REL(obj, real_bin, offset, bitoffs, bitsize, base); if ((bitsize + bitoffs) > 8) { sum += ERL_SUB_BIN_SIZE; extra_bytes = 2; @@ -146,11 +149,11 @@ size_object(Eterm obj) } else { extra_bytes = 0; } - hdr = *binary_val(real_bin); + hdr = *binary_val_rel(real_bin,base); if (thing_subtag(hdr) == REFC_BINARY_SUBTAG) { sum += PROC_BIN_SIZE; } else { - sum += heap_bin_size(binary_size(obj)+extra_bytes); + sum += heap_bin_size(binary_size_rel(obj,base)+extra_bytes); } goto pop_next; } @@ -181,8 +184,12 @@ size_object(Eterm obj) /* * Copy a structure to a heap. */ -Eterm -copy_struct(Eterm obj, Uint sz, Eterm** hpp, ErlOffHeap* off_heap) +#if HALFWORD_HEAP +Eterm copy_struct_rel(Eterm obj, Uint sz, Eterm** hpp, ErlOffHeap* off_heap, + Eterm* src_base, Eterm* dst_base) +#else +Eterm copy_struct(Eterm obj, Uint sz, Eterm** hpp, ErlOffHeap* off_heap) +#endif { char* hstart; Uint hsize; @@ -214,7 +221,10 @@ copy_struct(Eterm obj, Uint sz, Eterm** hpp, ErlOffHeap* off_heap) /* Copy the object onto the heap */ switch (primary_tag(obj)) { - case TAG_PRIMARY_LIST: argp = &res; goto L_copy_list; + case TAG_PRIMARY_LIST: + argp = &res; + objp = list_val_rel(obj,src_base); + goto L_copy_list; case TAG_PRIMARY_BOXED: argp = &res; goto L_copy_boxed; default: erl_exit(ERTS_ABORT_EXIT, @@ -231,32 +241,46 @@ copy_struct(Eterm obj, Uint sz, Eterm** hpp, ErlOffHeap* off_heap) hp++; break; case TAG_PRIMARY_LIST: - objp = list_val(obj); + objp = list_val_rel(obj,src_base); + #if !HALFWORD_HEAP || defined(DEBUG) if (in_area(objp,hstart,hsize)) { + ASSERT(!HALFWORD_HEAP); hp++; break; } + #endif argp = hp++; /* Fall through */ L_copy_list: tailp = argp; - while (is_list(obj)) { - objp = list_val(obj); + for (;;) { tp = tailp; - elem = *objp; + elem = CAR(objp); if (IS_CONST(elem)) { - *(hbot-2) = elem; - tailp = hbot-1; hbot -= 2; + CAR(hbot) = elem; + tailp = &CDR(hbot); } else { - *htop = elem; - tailp = htop+1; + CAR(htop) = elem; + #if HALFWORD_HEAP + CDR(htop) = CDR(objp); + *tailp = make_list_rel(htop,dst_base); + htop += 2; + goto L_copy; + #else + tailp = &CDR(htop); htop += 2; + #endif + } + ASSERT(!HALFWORD_HEAP || tp < hp || tp >= hbot); + *tp = make_list_rel(tailp - 1, dst_base); + obj = CDR(objp); + if (!is_list(obj)) { + break; } - *tp = make_list(tailp - 1); - obj = *(objp+1); + objp = list_val_rel(obj,src_base); } switch (primary_tag(obj)) { case TAG_PRIMARY_IMMED1: *tailp = obj; goto L_copy; @@ -268,21 +292,24 @@ copy_struct(Eterm obj, Uint sz, Eterm** hpp, ErlOffHeap* off_heap) } case TAG_PRIMARY_BOXED: - if (in_area(boxed_val(obj),hstart,hsize)) { + #if !HALFWORD_HEAP || defined(DEBUG) + if (in_area(boxed_val_rel(obj,src_base),hstart,hsize)) { + ASSERT(!HALFWORD_HEAP); hp++; break; } + #endif argp = hp++; L_copy_boxed: - objp = boxed_val(obj); + objp = boxed_val_rel(obj, src_base); hdr = *objp; switch (hdr & _TAG_HEADER_MASK) { case ARITYVAL_SUBTAG: { int const_flag = 1; /* assume constant tuple */ i = arityval(hdr); - *argp = make_tuple(htop); + *argp = make_tuple_rel(htop, dst_base); tp = htop; /* tp is pointer to new arity value */ *htop++ = *objp++; /* copy arity value */ while (i--) { @@ -311,7 +338,7 @@ copy_struct(Eterm obj, Uint sz, Eterm** hpp, ErlOffHeap* off_heap) while (i--) { *tp++ = *objp++; } - *argp = make_binary(hbot); + *argp = make_binary_rel(hbot, dst_base); pb = (ProcBin*) hbot; erts_refc_inc(&pb->val->refc, 2); pb->next = off_heap->first; @@ -338,7 +365,7 @@ copy_struct(Eterm obj, Uint sz, Eterm** hpp, ErlOffHeap* off_heap) extra_bytes = 0; } real_size = size+extra_bytes; - objp = binary_val(real_bin); + objp = binary_val_rel(real_bin,src_base); if (thing_subtag(*objp) == HEAP_BINARY_SUBTAG) { ErlHeapBin* from = (ErlHeapBin *) objp; ErlHeapBin* to; @@ -368,7 +395,7 @@ copy_struct(Eterm obj, Uint sz, Eterm** hpp, ErlOffHeap* off_heap) off_heap->first = (struct erl_off_heap_header*) to; OH_OVERHEAD(off_heap, to->size / sizeof(Eterm)); } - *argp = make_binary(hbot); + *argp = make_binary_rel(hbot, dst_base); if (extra_bytes != 0) { ErlSubBin* res; hbot -= ERL_SUB_BIN_SIZE; @@ -380,7 +407,7 @@ copy_struct(Eterm obj, Uint sz, Eterm** hpp, ErlOffHeap* off_heap) res->offs = 0; res->is_writable = 0; res->orig = *argp; - *argp = make_binary(hbot); + *argp = make_binary_rel(hbot, dst_base); } break; } @@ -400,7 +427,7 @@ copy_struct(Eterm obj, Uint sz, Eterm** hpp, ErlOffHeap* off_heap) off_heap->first = (struct erl_off_heap_header*) funp; erts_refc_inc(&funp->fe->refc, 2); #endif - *argp = make_fun(tp); + *argp = make_fun_rel(tp, dst_base); } break; case EXTERNAL_PID_SUBTAG: @@ -420,7 +447,7 @@ copy_struct(Eterm obj, Uint sz, Eterm** hpp, ErlOffHeap* off_heap) off_heap->first = (struct erl_off_heap_header*)etp; erts_refc_inc(&etp->node->refc, 2); - *argp = make_external(tp); + *argp = make_external_rel(tp, dst_base); } break; case BIN_MATCHSTATE_SUBTAG: @@ -430,7 +457,7 @@ copy_struct(Eterm obj, Uint sz, Eterm** hpp, ErlOffHeap* off_heap) i = thing_arityval(hdr)+1; hbot -= i; tp = hbot; - *argp = make_boxed(hbot); + *argp = make_boxed_rel(hbot, dst_base); while (i--) { *tp++ = *objp++; } @@ -885,12 +912,21 @@ Eterm copy_struct_lazy(Process *from, Eterm orig, Uint offs) * * NOTE: Assumes that term is a tuple (ptr is an untagged tuple ptr). */ -Eterm -copy_shallow(Eterm* ptr, Uint sz, Eterm** hpp, ErlOffHeap* off_heap) +#if HALFWORD_HEAP +Eterm copy_shallow_rel(Eterm* ptr, Uint sz, Eterm** hpp, ErlOffHeap* off_heap, + Eterm* src_base) +#else +Eterm copy_shallow(Eterm* ptr, Uint sz, Eterm** hpp, ErlOffHeap* off_heap) +#endif { Eterm* tp = ptr; Eterm* hp = *hpp; - Sint offs = hp - tp; + const Eterm res = make_tuple(hp); +#if HALFWORD_HEAP + const Sint offs = COMPRESS_POINTER(hp - (tp - src_base)); +#else + const Sint offs = (hp - tp) * sizeof(Eterm); +#endif while (sz--) { Eterm val = *tp++; @@ -901,7 +937,7 @@ copy_shallow(Eterm* ptr, Uint sz, Eterm** hpp, ErlOffHeap* off_heap) break; case TAG_PRIMARY_LIST: case TAG_PRIMARY_BOXED: - *hp++ = offset_ptr(val, offs); + *hp++ = byte_offset_ptr(val, offs); break; case TAG_PRIMARY_HEADER: *hp++ = val; @@ -958,7 +994,8 @@ copy_shallow(Eterm* ptr, Uint sz, Eterm** hpp, ErlOffHeap* off_heap) } } *hpp = hp; - return make_tuple(ptr + offs); + + return res; } /* Move all terms in heap fragments into heap. The terms must be guaranteed to |