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-rw-r--r--erts/emulator/beam/external.c103
1 files changed, 45 insertions, 58 deletions
diff --git a/erts/emulator/beam/external.c b/erts/emulator/beam/external.c
index e3e199b198..651aac03a2 100644
--- a/erts/emulator/beam/external.c
+++ b/erts/emulator/beam/external.c
@@ -1131,7 +1131,6 @@ enum B2TState { /* order is somewhat significant */
B2TSizeInit,
B2TSize,
B2TDecodeInit,
-
B2TDecode,
B2TDecodeList,
B2TDecodeTuple,
@@ -1157,9 +1156,6 @@ typedef struct {
Eterm* hp;
Eterm* hp_end;
int remaining_n;
-#ifdef DEBUG
- Eterm* container_end;
-#endif
} B2TDecodeContext;
typedef struct {
@@ -1352,20 +1348,28 @@ static BIF_RETTYPE binary_to_term_trap_1(BIF_ALIST_1)
#define B2T_BYTES_PER_REDUCTION 128
-static unsigned sverk_rand(void)
+/* Define for testing */
+/*#define EXTREME_B2T_TRAPPING 1*/
+
+#ifdef EXTREME_B2T_TRAPPING
+static unsigned b2t_rand(void)
{
static unsigned prev = 17;
prev = (prev * 214013 + 2531011);
return prev;
}
+#endif
+
static Eterm binary_to_term_int(Process* p, Uint32 flags, Eterm bin, Binary* context_b)
{
- SWord initial_reds = 1 + sverk_rand() % 4; /*(Uint)(ERTS_BIF_REDS_LEFT(p) * B2T_BYTES_PER_REDUCTION);*/
- byte* bytes;
+#ifdef EXTREME_B2T_TRAPPING
+ SWord initial_reds = 1 + b2t_rand() % 4;
+#else
+ SWord initial_reds = (Uint)(ERTS_BIF_REDS_LEFT(p) * B2T_BYTES_PER_REDUCTION);
+#endif
B2TContext c_buff;
B2TContext *ctx;
- ErtsDistExternal fakedep;
Eterm* magic_space = NULL;
if (context_b == NULL) {
@@ -1384,6 +1388,7 @@ static Eterm binary_to_term_int(Process* p, Uint32 flags, Eterm bin, Binary* con
do {
switch (ctx->state) {
case B2TPrepare: {
+ byte* bytes;
Uint bin_size;
bytes = erts_get_aligned_binary_bytes_extra(bin,
&ctx->aligned_alloc,
@@ -1403,32 +1408,30 @@ static Eterm binary_to_term_int(Process* p, Uint32 flags, Eterm bin, Binary* con
}
break;
}
- case B2TUncompressChunk:
- {
- Uint chunk = ctx->reds;
- int zret;
- if (chunk > ctx->u.uc.dleft)
- chunk = ctx->u.uc.dleft;
-
- zret = erl_zlib_inflate_chunk(&ctx->u.uc.stream,
- ctx->u.uc.dbytes, &chunk);
- ctx->u.uc.dbytes += chunk;
- ctx->u.uc.dleft -= chunk;
- if (zret == Z_OK && ctx->u.uc.dleft > 0) {
- ctx->reds = 0;
- }
- else if (erl_zlib_inflate_finish(&ctx->u.uc.stream) == Z_OK
- && zret == Z_STREAM_END
- && ctx->u.uc.dleft == 0) {
- ctx->reds -= chunk;
- ctx->state = B2TSizeInit;
- }
- else {
- ctx->state = B2TBadArg;
- }
- break;
- }
-
+ case B2TUncompressChunk: {
+ Uint chunk = ctx->reds;
+ int zret;
+
+ if (chunk > ctx->u.uc.dleft)
+ chunk = ctx->u.uc.dleft;
+ zret = erl_zlib_inflate_chunk(&ctx->u.uc.stream,
+ ctx->u.uc.dbytes, &chunk);
+ ctx->u.uc.dbytes += chunk;
+ ctx->u.uc.dleft -= chunk;
+ if (zret == Z_OK && ctx->u.uc.dleft > 0) {
+ ctx->reds = 0;
+ }
+ else if (erl_zlib_inflate_finish(&ctx->u.uc.stream) == Z_OK
+ && zret == Z_STREAM_END
+ && ctx->u.uc.dleft == 0) {
+ ctx->reds -= chunk;
+ ctx->state = B2TSizeInit;
+ }
+ else {
+ ctx->state = B2TBadArg;
+ }
+ break;
+ }
case B2TSizeInit:
ctx->u.sc.ep = NULL;
ctx->state = B2TSize;
@@ -1441,11 +1444,7 @@ static Eterm binary_to_term_int(Process* p, Uint32 flags, Eterm bin, Binary* con
case B2TDecodeInit:
if (context_b == NULL && ctx->b2ts.extsize > ctx->reds) {
- /*SVERK Can we do a better prediction that is still safe
- OR is there a way to do HAlloc after result some how...
- ... support for mutiple HReleases maybe?
- */
- /* dec_term will probably trap, allocate space for magic bin
+ /* dec_term will maybe trap, allocate space for magic bin
before result term to make it easy to trim with HRelease.
*/
magic_space = HAlloc(p, PROC_BIN_SIZE);
@@ -1462,11 +1461,12 @@ static Eterm binary_to_term_int(Process* p, Uint32 flags, Eterm bin, Binary* con
case B2TDecode:
case B2TDecodeList:
case B2TDecodeTuple:
- case B2TDecodeString:
+ case B2TDecodeString: {
+ ErtsDistExternal fakedep;
fakedep.flags = ctx->flags;
dec_term(&fakedep, NULL, NULL, &MSO(p), NULL, ctx);
break;
-
+ }
case B2TDecodeFail:
HRelease(p, ctx->u.dc.hp_end, ctx->u.dc.hp_start);
/*fall through*/
@@ -1495,7 +1495,7 @@ static Eterm binary_to_term_int(Process* p, Uint32 flags, Eterm bin, Binary* con
return ctx->u.dc.res;
}
- }while (ctx->reds || ctx->state >= B2TDone);
+ }while (ctx->reds > 0 || ctx->state >= B2TDone);
if (context_b == NULL) {
ASSERT(ctx->trap_bin == THE_NON_VALUE);
@@ -1524,13 +1524,6 @@ static Eterm binary_to_term_int(Process* p, Uint32 flags, Eterm bin, Binary* con
BIF_RETTYPE erts_internal_binary_to_term_1(BIF_ALIST_1)
{
-/*SVERK if (++sverk_cnt % 1000 == 0) {
- erts_fprintf(stderr, "Call #%u to binary_to_term_int()\n", sverk_cnt);
- }
- if (sverk_cnt == 1767) {
- sverk_break();
- }
-*/
return binary_to_term_int(BIF_P, 0, BIF_ARG_1, NULL);
}
@@ -2879,7 +2872,6 @@ 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:
@@ -2889,7 +2881,6 @@ 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:
@@ -2902,7 +2893,6 @@ dec_term(ErtsDistExternal *edep, Eterm** hpp, byte* ep, ErlOffHeap* off_heap,
}
hp[-1] = NIL;
*hpp = hp;
- ASSERT(ctx->u.dc.remaining_n || hp == ctx->u.dc.container_end);
break;
default:
@@ -3051,7 +3041,6 @@ dec_term_atom_common:
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;
@@ -3085,7 +3074,6 @@ 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;
@@ -3110,7 +3098,6 @@ dec_term_atom_common:
*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;
@@ -3981,6 +3968,9 @@ decoded_size(byte *ep, byte* endp, int internal_tags, B2TContext* ctx)
goto init_done;
}
}
+ else
+ reds = 0; /* not used but compiler warns anyway */
+
heap_size = 0;
terms = 1;
atom_extra_skip = 0;
@@ -4016,9 +4006,6 @@ init_done:
ASSERT(terms > 0);
do {
int tag;
- /*SVERK
- erts_fprintf(stderr, "SVERK tag=%d ep=%p terms=%d heap_size=%d endp=%p\n",
- ep[0], ep, terms, heap_size, endp); */
CHKSIZE(1);
tag = ep++[0];
switch (tag) {
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