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authorSverker Eriksson <[email protected]>2013-10-10 12:11:59 +0200
committerSverker Eriksson <[email protected]>2013-11-18 20:19:51 +0100
commitd42bd3b37d3b741d546d94fd7611afda81bba419 (patch)
tree8587916997d59d7c4bc3e22c45832d1233f4d309 /erts/emulator/beam/external.c
parent78a5dd69c9ed1749f2ad4fd24151e4aa784b1cba (diff)
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trapping STRING_EXT
Diffstat (limited to 'erts/emulator/beam/external.c')
-rw-r--r--erts/emulator/beam/external.c84
1 files changed, 55 insertions, 29 deletions
diff --git a/erts/emulator/beam/external.c b/erts/emulator/beam/external.c
index 48536d610b..2116c25cd2 100644
--- a/erts/emulator/beam/external.c
+++ b/erts/emulator/beam/external.c
@@ -1125,13 +1125,15 @@ BIF_RETTYPE term_to_binary_2(BIF_ALIST_2)
}
-enum B2TState {
+enum B2TState { /* order is somewhat significant */
/*B2TUncompress,*/
B2TSize,
B2TDecodeInit,
+
B2TDecode,
B2TDecodeList,
B2TDecodeTuple,
+ B2TDecodeString,
B2TDone,
B2TDecodeFail,
@@ -1150,7 +1152,7 @@ typedef struct {
Eterm* hp_end;
int remaining_n;
#ifdef DEBUG
- Eterm* container_start;
+ Eterm* container_end;
#endif
} B2TDecodeContext;
@@ -1402,6 +1404,7 @@ static Eterm binary_to_term_int(Process* p, Eterm bin, Binary* context_b)
case B2TDecode:
case B2TDecodeList:
case B2TDecodeTuple:
+ case B2TDecodeString:
dec_term(NULL, NULL, NULL, &MSO(p), NULL, ctx);
break;
@@ -2808,8 +2811,11 @@ dec_term(ErtsDistExternal *edep, Eterm** hpp, byte* ep, ErlOffHeap* off_heap,
SWord reds;
if (ctx) {
- reds = ctx->reds;
- next = ctx->u.dc.next;
+ hp_saved = ctx->u.dc.hp_start;
+ reds = ctx->reds;
+ next = ctx->u.dc.next;
+ ep = ctx->u.dc.ep;
+ hpp = &ctx->u.dc.hp;
if (ctx->state != B2TDecode) {
n = ctx->u.dc.remaining_n;
@@ -2832,6 +2838,7 @@ dec_term(ErtsDistExternal *edep, Eterm** hpp, byte* ep, ErlOffHeap* off_heap,
objp -= 2;
n--;
}
+ ASSERT(ctx->u.dc.remaining_n || next == ctx->u.dc.container_end);
break;
case B2TDecodeTuple:
@@ -2841,23 +2848,35 @@ dec_term(ErtsDistExternal *edep, Eterm** hpp, byte* ep, ErlOffHeap* off_heap,
next = objp;
objp--;
}
+ ASSERT(ctx->u.dc.remaining_n || next == ctx->u.dc.container_end);
+ break;
+
+ case B2TDecodeString:
+ hp = *hpp;
+ hp[-1] = make_list(hp); /* overwrite the premature NIL */
+ while (n-- > 0) {
+ hp[0] = make_small(*ep++);
+ hp[1] = make_list(hp+2);
+ hp += 2;
+ }
+ hp[-1] = NIL;
+ *hpp = hp;
+ ASSERT(ctx->u.dc.remaining_n || hp == ctx->u.dc.container_end);
break;
default:
ASSERT(!"Unknown state");
}
- if (ctx->u.dc.remaining_n) {
+ if (!ctx->u.dc.remaining_n) {
+ ctx->state = B2TDecode;
+ }
+ if (reds <= 0) {
ctx->u.dc.next = next;
+ ctx->u.dc.ep = ep;
ctx->reds = 0;
return NULL;
}
- ASSERT(next == ctx->u.dc.container_start);
- ctx->state = B2TDecode;
}
-
- hp_saved = ctx->u.dc.hp_start;
- ep = ctx->u.dc.ep;
- hpp = &ctx->u.dc.hp;
}
else {
hp_saved = *hpp;
@@ -2869,17 +2888,6 @@ dec_term(ErtsDistExternal *edep, Eterm** hpp, byte* ep, ErlOffHeap* off_heap,
while (next != NULL) {
- if (reds <= 0) {
- if (ctx) {
- ctx->u.dc.ep = ep;
- ctx->u.dc.next = next;
- ctx->u.dc.hp = hp;
- ctx->reds = 0;
- return NULL;
- }
- reds = ERTS_SWORD_MAX;
- }
-
objp = next;
next = (Eterm *) EXPAND_POINTER(*objp);
@@ -2998,13 +3006,11 @@ dec_term_atom_common:
tuple_loop:
*objp = make_tuple(hp);
*hp++ = make_arityval(n);
- #ifdef DEBUG
- if (ctx) ctx->u.dc.container_start = hp;
- #endif
hp += n;
objp = hp - 1;
if (ctx) {
if (reds < n) {
+ IF_DEBUG(ctx->u.dc.container_end = hp - n;)
ASSERT(reds > 0);
ctx->state = B2TDecodeTuple;
ctx->u.dc.remaining_n = n - reds;
@@ -3029,9 +3035,6 @@ dec_term_atom_common:
break;
}
*objp = make_list(hp);
- #ifdef DEBUG
- if (ctx) ctx->u.dc.container_start = hp;
- #endif
hp += 2 * n;
objp = hp - 2;
objp[0] = (Eterm) COMPRESS_POINTER((objp+1));
@@ -3041,6 +3044,7 @@ dec_term_atom_common:
n--;
if (ctx) {
if (reds < n) {
+ IF_DEBUG(ctx->u.dc.container_end = hp - 2*(n+1);)
ctx->state = B2TDecodeList;
ctx->u.dc.remaining_n = n - reds;
n = reds;
@@ -3063,6 +3067,15 @@ dec_term_atom_common:
break;
}
*objp = make_list(hp);
+ if (ctx) {
+ if (reds < n) {
+ IF_DEBUG(ctx->u.dc.container_end = hp + n*2;)
+ ctx->state = B2TDecodeString;
+ ctx->u.dc.remaining_n = n - reds;
+ n = reds;
+ }
+ reds -= n;
+ }
while (n-- > 0) {
hp[0] = make_small(*ep++);
hp[1] = make_list(hp+2);
@@ -3604,7 +3617,20 @@ dec_term_atom_common:
return NULL;
}
- --reds;
+ if (--reds <= 0) {
+ if (ctx) {
+ if (next || ctx->state != B2TDecode) {
+ ctx->u.dc.ep = ep;
+ ctx->u.dc.next = next;
+ ctx->u.dc.hp = hp;
+ ctx->reds = 0;
+ return NULL;
+ }
+ }
+ else {
+ reds = ERTS_SWORD_MAX;
+ }
+ }
}
if (ctx) {
ctx->state = B2TDone;