This section supersedes .reginfo and .MIPS.options sections. But for now
we have to support all three sections for ABI transition period.
llvm-svn: 278482
MIPS ISA encoded using two ELF flags: general architecture flag like
EF_MIPS_ARCH_32, EF_MIPS_ARCH_64R6 etc and optional machine variant flag
like EF_MIPS_MACH_4111, EF_MIPS_MACH_OCTEON3 etc. When we check
compatibility between two input files and deduce ELF flags for generated
output we need to take into account both of these flags.
llvm-svn: 278230
Previously, we incrementally updated the reuslting flag as we check
file flags, so it was not very clear who is updating what flags.
This patch makes them pure functions -- that has no side effect and
don't update arguments to improve readability.
Now each function construct a patial result, and all resutls are then
bitwise-OR'ed to construct the final result.
This patch also creates a new file, Mips.cpp, to move all these
MIPS functions to a separate file.
Differential Revision: https://reviews.llvm.org/D23249
llvm-svn: 278042
The patch extends the `getMipsEFlags` function. Now in that function
we iterate over all object files, parse ELF header flags and merge them.
If a file is incompatible with previously analyzed ones we show an error
or warning. That can happen if, for example, we try to link files with
incompatible ABI, ISA, NAN encoding etc.
There is an alternative solution. We can check and merge flags and
reject incompatible input modules in the `isCompatible` function which
is called from the `SymbolTable::addFile` method. But in that case we
have to save and keep somewhere a merged ELF flags combination to use it
later in the writer.
Differential Revision: http://reviews.llvm.org/D23161
llvm-svn: 277911
Simon Atanasyan