/*
* NAME: line->fix()
* DESCRIPTION: Fix the new line number. Return 0 .. 2 for simple offsets,
* 3 for special ones.
*/
static int line_fix(unsigned short newline)
{
short offset;
if (newline == 0) {
/* nothing changes */
return 0;
}
offset = newline - line;
if (line != 0 && offset >= 0 && offset <= 2) {
/* simple offset */
line = newline;
return offset;
}
if (offset >= -64 && offset <= 63) {
/* one byte offset */
line_byte(offset + 128 + 64);
} else {
/* two byte offset */
offset += 16384;
line_byte((offset >> 8) & 127);
line_byte(offset);
}
line = newline;
return 3;
}
TEST(gc, memset_with_concurrent_readers) {
const size_t chunk_size = 8 * BytesPerWord;
const unsigned chunk_count = 4;
const size_t block_size = (chunk_count + 4) * chunk_size;
char block[block_size];
char clear_block[block_size];
char set_block[block_size];
// block format:
// 0: unused leading chunk
// 1: chunk written from start index to end of chunk
// ... nchunks fully written chunks
// N: chunk written from start of chunk to end index
// N+1: unused trailing chunk
const int clear_value = 0;
const int set_value = 0xAC;
memset(clear_block, clear_value, block_size);
memset(set_block, set_value, block_size);
for (unsigned nchunks = 0; nchunks <= chunk_count; ++nchunks) {
for (size_t start = 1; start <= chunk_size; ++start) {
for (size_t end = 0; end <= chunk_size; ++end) {
size_t set_start = chunk_size + start;
size_t set_end = (2 + nchunks) * chunk_size + end;
size_t set_size = set_end - set_start;
memset(block, clear_value, block_size);
memset_with_concurrent_readers(&block[set_start], set_value, set_size);
bool head_clear = !memcmp(clear_block, block, set_start);
bool middle_set = !memcmp(set_block, block + set_start, set_size);
bool tail_clear = !memcmp(clear_block, block + set_end, block_size - set_end);
if (!(head_clear && middle_set && tail_clear)) {
std::ostringstream err_stream;
err_stream << "*** memset_with_concurrent_readers failed: set start "
<< set_start << ", set end " << set_end << std::endl;
for (unsigned chunk = 0; chunk < (block_size / chunk_size); ++chunk) {
for (unsigned line = 0; line < (chunk_size / BytesPerWord); ++line) {
const char* lp = &block[chunk * chunk_size + line * BytesPerWord];
err_stream << std::dec << chunk << "," << line << ": " << std::hex
<< std::setw(2) << line_byte(lp, 0) << " "
<< std::setw(2) << line_byte(lp, 1) << " "
<< std::setw(2) << line_byte(lp, 2) << " "
<< std::setw(2) << line_byte(lp, 3) << " "
<< std::setw(2) << line_byte(lp, 4) << " "
<< std::setw(2) << line_byte(lp, 5) << " "
<< std::setw(2) << line_byte(lp, 6) << " "
<< std::setw(2) << line_byte(lp, 7) << std::endl;
}
}
EXPECT_TRUE(head_clear) << "leading byte not clear";
EXPECT_TRUE(middle_set) << "memset byte not set";
EXPECT_TRUE(tail_clear) << "trailing bye not clear";
ASSERT_TRUE(head_clear && middle_set && tail_clear) << err_stream.str();
}
}
}
}
}
