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fe25521451
To support compressing the debug_line section that contains multiple fragments (due, I believe, to variation in choices of line table encoding depending on the size of instruction ranges in the actual program code) we needed to support compressing multiple MCFragments in a single pass. This patch implements that behavior by mutating the post-relaxed and relocated section to be the compressed form of its former self, including renaming the section. This is a more flexible (and less invasive, to a degree) implementation that will allow for other features such as "use compression only if it's smaller than the uncompressed data". Compressing debug_frame would be a possible further extension to this work, but I've left it for now. The hurdle there is alignment sections - which might require going as far as to refactor MCAssembler.cpp:writeFragment to handle writing to a byte buffer or an MCObjectWriter (there's already a virtual call there, so it shouldn't add substantial compile-time cost) which could in turn involve refactoring MCAsmBackend::writeNopData to use that same abstraction... which involves touching all the backends. This would remove the limited handling of fragment writing seen in ELFObjectWriter.cpp:getUncompressedData which would be nice - but it's more invasive. I did discover that I (perhaps obviously) don't need to handle relocations when I rewrite the fragments - since the relocations have already been applied and computed (and stored into ELFObjectWriter::Relocations) by this stage (necessarily, because we need to have written any immediate values or assembly-time relocations into the data already before we compress it, which we have). The test case doesn't necessarily cover that in detail - I can add more test coverage if that's preferred. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205990 91177308-0d34-0410-b5e6-96231b3b80d8 |
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| .. | ||
| abs.s | ||
| alias-reloc.s | ||
| alias.s | ||
| align-bss.s | ||
| align-nops.s | ||
| align-size.s | ||
| align-text.s | ||
| align.s | ||
| bad-expr2.s | ||
| bad-expr3.s | ||
| bad-expr.s | ||
| bad-relocation.s | ||
| bad-section.s | ||
| basic-elf-32.s | ||
| basic-elf-64.s | ||
| bracket-exprs.s | ||
| bracket.s | ||
| bss-large.ll | ||
| bss.ll | ||
| call-abs.s | ||
| cfi-adjust-cfa-offset.s | ||
| cfi-advance-loc2.s | ||
| cfi-def-cfa-offset.s | ||
| cfi-def-cfa-register.s | ||
| cfi-def-cfa.s | ||
| cfi-escape.s | ||
| cfi-offset.s | ||
| cfi-reg.s | ||
| cfi-register.s | ||
| cfi-rel-offset2.s | ||
| cfi-rel-offset.s | ||
| cfi-remember.s | ||
| cfi-restore.s | ||
| cfi-same-value.s | ||
| cfi-sections.s | ||
| cfi-signal-frame.s | ||
| cfi-undefined.s | ||
| cfi-window-save.s | ||
| cfi-zero-addr-delta.s | ||
| cfi.s | ||
| comdat-dup-group-name.s | ||
| comdat-reloc.s | ||
| comdat.s | ||
| common2.s | ||
| common.s | ||
| comp-dir.s | ||
| compression.s | ||
| debug-line2.s | ||
| debug-line.s | ||
| debug-loc.s | ||
| diff2.s | ||
| diff.s | ||
| discriminator.s | ||
| dot-symbol-assignment.s | ||
| elf_directive_previous.s | ||
| elf_directive_section.s | ||
| empty-dwarf-lines.s | ||
| empty.s | ||
| entsize.ll | ||
| entsize.s | ||
| fde.s | ||
| file-double.s | ||
| file.s | ||
| gen-dwarf.s | ||
| global-offset.s | ||
| got.s | ||
| ident.s | ||
| ifunc-reloc.s | ||
| invalid-symver.s | ||
| lcomm.s | ||
| leb128.s | ||
| lit.local.cfg | ||
| local-reloc.s | ||
| many-sections-2.s | ||
| many-sections.s | ||
| merge.s | ||
| n_bytes.s | ||
| no-fixup.s | ||
| nocompression.s | ||
| noexec.s | ||
| norelocation.s | ||
| offset.s | ||
| org.s | ||
| pic-diff.s | ||
| plt.s | ||
| pr9292.s | ||
| relax-all-flag.s | ||
| relax-arith.s | ||
| relax-crash.s | ||
| relax.s | ||
| relocation-386.s | ||
| relocation-pc.s | ||
| relocation.s | ||
| rename.s | ||
| section-quoting.s | ||
| section.s | ||
| set.s | ||
| sleb.s | ||
| subsection.s | ||
| symbol-names.s | ||
| symref.s | ||
| tls-i386.s | ||
| tls.s | ||
| type-propagate.s | ||
| type.s | ||
| uleb.s | ||
| undef2.s | ||
| undef.s | ||
| version.s | ||
| weak-relocation.s | ||
| weak.s | ||
| weakref-plt.s | ||
| weakref-reloc.s | ||
| weakref.s | ||
| x86_64-reloc-sizetest.s | ||
| zero.s | ||