The current code for processCIE and processFDE returns out if it sees
any references. The problem with this is that some references could be
explicit in the binary, while others are implicit as they can be
inferred from the content of the EHFrame itself.
This change walks the references we have against the references we
need, and verifies that all explicit references are in the correct place,
and generates any missing implicit ones.
Reviewed by Lang Hames and Nick Kledzik.
Differential Revision: http://reviews.llvm.org/D15439
llvm-svn: 263590
Now that DarwinLdDriver is the only derived class of Driver.
This patch merges them and actually removed the class because
they can now just be non-member functions. This change simplifies
a common header, Driver.h.
http://reviews.llvm.org/D17788
llvm-svn: 262502
CoreDriver implements a driver for a hypothetical platform.
It is intended to be used in unittests. However, it is actually
redundant because the features are tested using the real driver
for the real platforms. So we can remove this.
http://reviews.llvm.org/D17698
llvm-svn: 262421
UniversalDriver was used as a dispatcher to each platform-specific driver.
It had its own Options.td file. It was not just too much to parse only a
few options (we only want to parse -core, -flavor or argv[0]),
but also interpreted arguments too early. For example, if you invoke lld as
"lld -flavor gnu ... -help", then you'd get the UniversalDriver's help
message instead of GnuDriver's. This patch eliminates the use of Options
from the dispatcher.
http://reviews.llvm.org/D17686
llvm-svn: 262190
IIUC, range was an experiment to see how N3350 would work in LLD.
It turned out it didn't get traction, and it is basically duplicate
of iterator_range in ADT. We have only two occurrences of range,
and all of them are easily rewritten without it.
http://reviews.llvm.org/D17687
llvm-svn: 262171
The non lazy atoms generated in the stubs pass use an image cache to
hold all of the pointers. On arm archs, this is the __got section,
but on x86 archs it should be __nl_symbol_ptr.
rdar://problem/24572729
llvm-svn: 260271
Also added the defaults for whether to generate this load command, which
the cmdline options are able to override.
There was also a difference to ld64 which is fixed here in that ld64 will
generate an empty data in code command if requested.
rdar://problem/24472630
llvm-svn: 260191
This load command generates data in the LINKEDIT section which
is a list of ULEB128 delta's to all of the functions in the __text section.
It is then 0 terminated and pointer aligned to pad.
ld64 exposes the -function-starts and no-function-starts cmdline options
to override behaviour from the defaults based on file types.
rdar://problem/24472630
llvm-svn: 260188
The atom content type enum is used as a tie breaker to sort atoms.
In that case, we want MachHeader to be before typeCode as it really will
be before the code in the final executable.
Test case to follow in the next commit or two.
llvm-svn: 260184
This is of the form A.B.C.D.E and to match ld64's behaviour, is
always output to files, even when the version is 0.
rdar://problem/24472630
llvm-svn: 259746
This option is emitted in the min_version load commands.
Note, there's currently a difference in behaviour compared to ld64 in
that we emit a warning if we generate a min_version load command and
didn't give an sdk_version. We need to decide what the correct behaviour
is here as its possible we want to emit an error and force clients to
provide the option.
llvm-svn: 259729
If the command line contains something like -macosx_version_min and we
don't explicitly disable generation with -no_version_load_command then
we generate the LC_VERSION_MIN command in the output file.
There's a couple of FIXME's in here. These will be handled soon with
more tests but I didn't want to grow this patch any more than it already was.
rdar://problem/24472630
llvm-svn: 259718
The magic file which contained these symbols inherited from archive
which meant that the resolver didn't add the required atoms as archive
members only get added when referenced. Instead we now inherit from
SimpleFile which always links in the atoms needed.
The second issue was in the handling of these symbols when we emit
the MachO. The mach header symbol needs to be in the atom list as
it gets an offset (0), and being in the atom list makes sure it is
emitted to the symbol table. DSO handles are not emitted to the
symbol table.
rdar://problem/24450654
llvm-svn: 259574
An upcoming patch will use this to create lists of ObjC methods.
Adding it now to reduce the amount of code in that patch.
Test cases will follow in the other patch too.
llvm-svn: 259440
This adds the no_objc_category_merging cmdline option which will
be used in an upcoming commit to disable the category optimizer.
It is on by default in ld64 so we match that here.
Test case will come soon with the patch to make use of this option.
llvm-svn: 259439
Most of the other methods to access Reference's were on DefinedAtom so
this just keeps them all together.
This will be used in a future patch in ObjCPass which needs to add
new references. The method is virtual because we may add references to
different data structures depending on whether we parsed a macho file or
yaml.
llvm-svn: 259436
This will be used by a future commit which wanted to compare iterators
for equality.
Also changed operator!= to be in terms of the new operator==
llvm-svn: 259431
In many situations, we don't want to exit at the first error even in the
process model. For example, it is better to report all undefined symbols
rather than reporting the first one that the linker picked up randomly.
In order to handle such errors, we don't need to wrap everything with
ErrorOr (thanks for David Blaikie for pointing this out!) Instead, we
can set a flag to record the fact that we found an error and keep it
going until it reaches a reasonable checkpoint.
This idea should be applicable to other places. For example, we can
ignore broken relocations and check for errors after visiting all relocs.
In this patch, I rename error to fatal, and introduce another version of
error which doesn't call exit. That function instead sets HasError to true.
Once HasError becomes true, it stays true, so that we know that there
was an error if it is true.
I think introducing a non-noreturn error reporting function is by itself
a good idea, and it looks to me that this also provides a gradual path
towards lld-as-a-library (or at least embed-lld-to-your-program) without
sacrificing code readability with lots of ErrorOr's.
http://reviews.llvm.org/D16641
llvm-svn: 259069
This option matches the behaviour of ld64, that is it prevents globals
from being dead stripped in executables and dylibs.
Reviewed by Lang Hames
Differential Revision: http://reviews.llvm.org/D16026
llvm-svn: 258554
This pass currently emits an objc image info section if one is required.
This section contains the aggregated version and flags for all of the input
files.
llvm-svn: 258197
Image info flags describe the objc constraint which is GC/retain/release/etc.
These need to be parsed and stored in the file so that we can do error checking.
That will come in a later commit.
llvm-svn: 258160
This is to enable isa<> support for any files which need it.
It will be used in an upcoming patch to differentiate MachOFile from other implicitly generated files.
Reviewed by Lang Hames.
Differential Revision: http://reviews.llvm.org/D16103
llvm-svn: 257830
This is called from the resolver on each file we decide we actually want to use.
Future commits will make use of this to extract useful information from the files and do
error checking against the context. For example, ensure that files are the same arch as
each other.
Reviewed by Lang Hames.
Differential Revision: http://reviews.llvm.org/D16093
llvm-svn: 257814
We used to parse the LLVM options in Driver::link. However, that is
after parse() where we load files. By moving the LLVM option handling
earlier, we can add DEBUG() to code such as MachONormalizedFileToAtoms.cpp
and have it enabled correctly by '-mllvm --debug'.
llvm-svn: 255819
Pete Cooper