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path: root/llvm/lib/MC/StringTableBuilder.cpp
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2016-05-06Make StringTableBuilder to cache hash values.Rui Ueyama1-4/+4
This change seems to speed up LLD a bit if it has a lot of mergeable sections. The number is below. It's not too bad for a small patch. Time to link Clang (debug build): w/o patch 6.3696 seconds w/patch 6.2746 seconds (-1.5%) Differential Revision: http://reviews.llvm.org/D19933 llvm-svn: 268698
2016-02-19Add support for merging strings with alignment larger than one char.Rafael Espindola1-8/+16
This will be used in a lld patch. llvm-svn: 261326
2016-01-29Reland "[CodeView] Use assembler directives for line tables"Reid Kleckner1-8/+47
This reverts commit r259126 and relands r259117. This time with updated library dependencies. llvm-svn: 259130
2016-01-29Revert "[CodeView] Use assembler directives for line tables"Reid Kleckner1-47/+8
This reverts commit r259117. The LineInfo constructor is defined in the codeview library and we have to link against it now. Doing that isn't trivial, so reverting for now. llvm-svn: 259126
2016-01-28[CodeView] Use assembler directives for line tablesReid Kleckner1-8/+47
Adds a new family of .cv_* directives to LLVM's variant of GAS syntax: - .cv_file: Similar to DWARF .file directives - .cv_loc: Similar to the DWARF .loc directive, but starts with a function id. CodeView line tables are emitted by function instead of by compilation unit, so we needed an extra field to communicate this. Rather than overloading the .loc direction further, we decided it was better to have our own directive. - .cv_stringtable: Emits the codeview string table at the current position. Currently this just contains the filenames as null-terminated strings. - .cv_filechecksums: Emits the file checksum table for all files used with .cv_file so far. There is currently no support for emitting actual checksums, just filenames. This moves the line table emission code down into the assembler. This is in preparation for implementing the inlined call site line table format. The inline line table format encoding algorithm requires knowing the absolute code offsets, so it must run after the assembler has laid out the code. David Majnemer collaborated on this patch. llvm-svn: 259117
2015-10-27Rename qsort -> multikey_qsort. NFC.Rui Ueyama1-4/+4
`qsort` as a file-scope local function name was confusing. llvm-svn: 251414
2015-10-26Optimize StringTableBuilder.Rui Ueyama1-14/+42
This is a patch to improve StringTableBuilder's performance. That class' finalize function is very hot particularly in LLD because the function does tail-merge strings in string tables or SHF_MERGE sections. Generic std::sort-style sorter is not efficient for sorting strings. The function implemented in this patch seems to be more efficient. Here's a benchmark of LLD to link Clang with or without this patch. The numbers are medians of 50 runs. -O0 real 0m0.455s real 0m0.430s (5.5% faster) -O3 real 0m0.487s real 0m0.452s (7.2% faster) Since that is a benchmark of the whole linker, the speedup of StringTableBuilder itself is much more than that. http://reviews.llvm.org/D14053 llvm-svn: 251337
2015-10-23Add a RAW mode to StringTableBuilder.Rafael Espindola1-5/+16
In this mode it just tries to tail merge the strings without imposing any other format constrains. It will not, for example, add a null byte between them. Also add support for keeping a tentative size and offset if we decide to not optimize after all. This will be used shortly in lld for merging SHF_STRINGS sections. llvm-svn: 251153
2015-10-23Fix the variable names to match the LLVM style.Rafael Espindola1-27/+27
llvm-svn: 251143
2015-10-22Avoid storing a second copy of each string in StringTableBuilder.Rafael Espindola1-9/+20
This was only use in the extremely uncommon case of @@@ symbols on ELF. llvm-svn: 251039
2015-10-22Fix broken build under MSVC.Zachary Turner1-0/+2
llvm-svn: 251030
2015-10-22Avoid hash lookups when finalizing StringTableBuilder. NFC.Rafael Espindola1-10/+11
llvm-svn: 251024
2015-10-22Use array_pod_sort. NFC.Rafael Espindola1-4/+7
llvm-svn: 251023
2014-10-06MachObjectWriter: optimize the string table for common sufficesHans Wennborg1-3/+17
This is a follow-up to r207670 (ELF) and r218636 (COFF). Differential Revision: http://reviews.llvm.org/D5622 llvm-svn: 219126
2014-09-29WinCOFFObjectWriter: optimize the string table for common sufficesHans Wennborg1-4/+27
This is a follow-up from r207670 which did the same for ELF. Differential Revision: http://reviews.llvm.org/D5530 llvm-svn: 218636
2014-09-24Revert r218380. This was breaking Apple internal build bots.Akira Hatanaka1-6/+14
llvm-svn: 218409
2014-09-24Replace a hand-written suffix compare with std::lexicographical_compare.Benjamin Kramer1-14/+6
No functionality change. llvm-svn: 218380
2014-07-03Invert the MC -> Object dependency.Rafael Espindola1-0/+51
Now that we have a lib/MC/MCAnalysis, the dependency was there just because of two helper classes. Move the two over to MC. This will allow IRObjectFile to parse inline assembly. llvm-svn: 212248
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