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8219860: Cleanup ClassFileParser::parse_linenumber_table

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Reviewed-by: rehn, lfoltan, hseigel
This commit is contained in:
Claes Redestad 2019-03-08 23:02:06 +01:00
parent 69a6a6c4a0
commit d2c205bb59
10 changed files with 85 additions and 332 deletions
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24
src/hotspot/share/oops/method.cpp
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@ -1684,35 +1684,11 @@ void Method::print_codes_on(int from, int to, outputStream* st) const {
while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st);
}
// Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas
// between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned)
// we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used
// as end-of-stream terminator.
void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) {
// bci and line number does not compress into single byte.
// Write out escape character and use regular compression for bci and line number.
write_byte((jubyte)0xFF);
write_signed_int(bci_delta);
write_signed_int(line_delta);
}
// See comment in method.hpp which explains why this exists.
#if defined(_M_AMD64) && _MSC_VER >= 1400
#pragma optimize("", off)
void CompressedLineNumberWriteStream::write_pair(int bci, int line) {
write_pair_inline(bci, line);
}
#pragma optimize("", on)
#endif
CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) {
_bci = 0;
_line = 0;
};
bool CompressedLineNumberReadStream::read_pair() {
jubyte next = read_byte();
// Check for terminator