[PATCH] D42720: [CodeGen] Switch non-SJLJ EH encoding to uleb128

[Ryan Prichard via Phabricator via llvm-commits]

rprichard created this revision.
Herald added subscribers: llvm-commits, JDevlieghere, javed.absar, aprantl.

With this commit, LLVM emits a DWARF EH table using GCC-style assembly by
default. Offsets in the EH table (code offsets in the call site table,
the call site table size, and the offset to TTBase) are calculated in the
assembler rather than in the compiler. Doing so allows switching the
encoding of code offsets in the call site table from udata4 to uleb128,
which can reduce the size of the EH table by half.

This behavior is on by default. The old behavior can be restored with
-mllvm -layout-eh-table-in-assembler=0.


Repository:
  rL LLVM

https://reviews.llvm.org/D42720

Files:
  include/llvm/CodeGen/AsmPrinter.h
  include/llvm/MC/MCObjectStreamer.h
  include/llvm/MC/MCStreamer.h
  lib/CodeGen/AsmPrinter/ARMException.cpp
  lib/CodeGen/AsmPrinter/AsmPrinterDwarf.cpp
  lib/CodeGen/AsmPrinter/DwarfException.h
  lib/CodeGen/AsmPrinter/EHStreamer.cpp
  lib/CodeGen/AsmPrinter/EHStreamer.h
  lib/MC/MCAsmStreamer.cpp
  lib/MC/MCObjectStreamer.cpp
  lib/MC/MCStreamer.cpp

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