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Support creating and matching bitstrings that are in fact binaries (size divisible by 8) #1978

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Support creating and matching bitstrings that are in fact binaries (size divisible by 8) #1978

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32 changes: 22 additions & 10 deletions src/libAtomVM/opcodesswitch.h
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Original file line number Diff line number Diff line change
Expand Up @@ -5447,20 +5447,21 @@ HOT_FUNC int scheduler_entry_point(GlobalContext *glb)
term bs_bin = term_get_match_state_binary(src);
avm_int_t bs_offset = term_get_match_state_offset(src);

if (unit != 8) {
TRACE("bs_get_binary2: Unsupported: unit must be 8.\n");
RAISE_ERROR(UNSUPPORTED_ATOM);
}
avm_int_t size_val = 0;
if (term_is_integer(size)) {
size_val = term_to_int(size);
size_val = term_to_int(size) * unit;
if (size_val % 8) {
TRACE("bs_get_binary2: Unsupported: size must be divisible by 8, got: %ld\n", size_val);
RAISE_ERROR(UNSUPPORTED_ATOM);
}
size_val = size_val / 8;
} else if (size == ALL_ATOM) {
size_val = term_binary_size(bs_bin) - bs_offset / 8;
} else {
TRACE("bs_get_binary2: size is neither an integer nor the atom `all`\n");
RAISE_ERROR(BADARG_ATOM);
}
if (bs_offset % unit != 0) {
if (bs_offset % 8 != 0) {
TRACE("bs_get_binary2: Unsupported. Offset on binary read must be aligned on byte boundaries.\n");
RAISE_ERROR(BADARG_ATOM);
}
Expand All @@ -5471,11 +5472,11 @@ HOT_FUNC int scheduler_entry_point(GlobalContext *glb)

TRACE("bs_get_binary2/7, fail=%u src=%p live=%u unit=%u\n", (unsigned) fail, (void *) bs_bin, (unsigned) live, (unsigned) unit);

if ((unsigned int) (bs_offset / unit + size_val) > term_binary_size(bs_bin)) {
if ((unsigned int) (bs_offset / 8 + size_val) > term_binary_size(bs_bin)) {
TRACE("bs_get_binary2: insufficient capacity -- bs_offset = %d, size_val = %d\n", (int) bs_offset, (int) size_val);
JUMP_TO_ADDRESS(mod->labels[fail]);
} else {
term_set_match_state_offset(src, bs_offset + size_val * unit);
term_set_match_state_offset(src, bs_offset + size_val * 8);

TRIM_LIVE_REGS(live);
// there is always room for a MAX_REG + 1 register, used as working register
Expand Down Expand Up @@ -6940,7 +6941,12 @@ HOT_FUNC int scheduler_entry_point(GlobalContext *glb)
}
} else {
VERIFY_IS_INTEGER(size, "bs_create_bin/6", fail);
avm_int_t signed_size_value = term_to_int(size);
avm_int_t signed_size_value = term_to_int(size) * segment_unit;
if (UNLIKELY(signed_size_value % 8)) {
TRACE("bs_create_bin/6: Unsupported: size must be dvisible by 8, got: %ld\n", signed_size_value);
RAISE_ERROR(UNSUPPORTED_ATOM);
}
signed_size_value = signed_size_value / 8;
if (UNLIKELY(signed_size_value < 0)) {
if (fail == 0) {
RAISE_ERROR(BADARG_ATOM);
Expand All @@ -6957,6 +6963,7 @@ HOT_FUNC int scheduler_entry_point(GlobalContext *glb)
}
}
segment_size = signed_size_value;
segment_unit = 8;
}
break;
}
Expand Down Expand Up @@ -7109,7 +7116,12 @@ HOT_FUNC int scheduler_entry_point(GlobalContext *glb)
TRACE("bs_create_bin/6: size value less than 0: %i\n", (int) signed_size_value);
RAISE_ERROR(BADARG_ATOM);
}
size_value = (size_t) signed_size_value;
size_value = (size_t) signed_size_value * segment_unit;
if (UNLIKELY(size_value % 8)) {
TRACE("bs_create_bin/6: Unsupported: bitstring size (%d) is not evenly divisible by 8\n", (int) size_value);
RAISE_ERROR(UNSUPPORTED_ATOM);
}
size_value = size_value / 8;
if (size_value > src_size) {
if (fail == 0) {
RAISE_ERROR(BADARG_ATOM);
Expand Down
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