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-rw-r--r--erts/emulator/beam/erl_bits.c29
1 files changed, 29 insertions, 0 deletions
diff --git a/erts/emulator/beam/erl_bits.c b/erts/emulator/beam/erl_bits.c
index 53c21c40e1..f96cb02587 100644
--- a/erts/emulator/beam/erl_bits.c
+++ b/erts/emulator/beam/erl_bits.c
@@ -165,6 +165,26 @@ erts_bs_start_match_2(Process *p, Eterm Binary, Uint Max)
return make_matchstate(ms);
}
+#ifdef DEBUG
+# define CHECK_MATCH_BUFFER(MB) check_match_buffer(MB)
+
+static void check_match_buffer(ErlBinMatchBuffer* mb)
+{
+ Eterm realbin;
+ Uint byteoffs;
+ byte* bytes, bitoffs, bitsz;
+ ProcBin* pb;
+ ERTS_GET_REAL_BIN(mb->orig, realbin, byteoffs, bitoffs, bitsz);
+ bytes = binary_bytes(realbin) + byteoffs;
+ ERTS_ASSERT(mb->base >= bytes && mb->base <= (bytes + binary_size(mb->orig)));
+ pb = (ProcBin *) boxed_val(realbin);
+ if (pb->thing_word == HEADER_PROC_BIN)
+ ERTS_ASSERT(pb->flags == 0);
+}
+#else
+# define CHECK_MATCH_BUFFER(MB)
+#endif
+
Eterm
erts_bs_get_integer_2(Process *p, Uint num_bits, unsigned flags, ErlBinMatchBuffer* mb)
{
@@ -185,6 +205,7 @@ erts_bs_get_integer_2(Process *p, Uint num_bits, unsigned flags, ErlBinMatchBuff
return SMALL_ZERO;
}
+ CHECK_MATCH_BUFFER(mb);
if (mb->size - mb->offset < num_bits) { /* Asked for too many bits. */
return THE_NON_VALUE;
}
@@ -425,6 +446,7 @@ erts_bs_get_binary_2(Process *p, Uint num_bits, unsigned flags, ErlBinMatchBuffe
{
ErlSubBin* sb;
+ CHECK_MATCH_BUFFER(mb);
if (mb->size - mb->offset < num_bits) { /* Asked for too many bits. */
return THE_NON_VALUE;
}
@@ -456,6 +478,7 @@ erts_bs_get_float_2(Process *p, Uint num_bits, unsigned flags, ErlBinMatchBuffer
byte* fptr;
FloatDef f;
+ CHECK_MATCH_BUFFER(mb);
if (num_bits == 0) {
f.fd = 0.0;
hp = HeapOnlyAlloc(p, FLOAT_SIZE_OBJECT);
@@ -509,6 +532,8 @@ erts_bs_get_binary_all_2(Process *p, ErlBinMatchBuffer* mb)
{
ErlSubBin* sb;
Uint size;
+
+ CHECK_MATCH_BUFFER(mb);
size = mb->size-mb->offset;
sb = (ErlSubBin *) HeapOnlyAlloc(p, ERL_SUB_BIN_SIZE);
sb->thing_word = HEADER_SUB_BIN;
@@ -1605,6 +1630,7 @@ erts_bs_get_unaligned_uint32(ErlBinMatchBuffer* mb)
byte* LSB;
byte* MSB;
+ CHECK_MATCH_BUFFER(mb);
ASSERT((mb->offset & 7) != 0);
ASSERT(mb->size - mb->offset >= 32);
@@ -1664,6 +1690,8 @@ erts_bs_get_utf8(ErlBinMatchBuffer* mb)
2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 3,3,3,3,3,3,3,3,9,9,9,9,9,9,9,9
};
+ CHECK_MATCH_BUFFER(mb);
+
if ((remaining_bits = mb->size - mb->offset) < 8) {
return THE_NON_VALUE;
}
@@ -1748,6 +1776,7 @@ erts_bs_get_utf16(ErlBinMatchBuffer* mb, Uint flags)
return THE_NON_VALUE;
}
+ CHECK_MATCH_BUFFER(mb);
/*
* Set up the pointer to the source bytes.
*/