This adds support for the CFI pseudo-op return_column. This specifies
the frame table column which contains the return address.
Addresses PR33953!
llvm-svn: 309360
The issue is not if the value is pcrel. It is whether we have a
relocation or not.
If we have a relocation, the static linker will select the upper
bits. If we don't have a relocation, we have to do it.
llvm-svn: 307730
Summary: When implementing MCFillFragment, use the size of the fragment,
rather than the size of the section.
Patch by Dan Gohman
Differential Revision: https://reviews.llvm.org/D35090
llvm-svn: 307565
Model weakly defined symbols as symbols that are both
exports and imported and marked as weak. Local references
to the symbols refer to the import but the linker can
resolve this to the weak export if not strong symbol
is found at link time.
Differential Revision: https://reviews.llvm.org/D35029
llvm-svn: 307348
Previously we were generating a void(void) function type
for a weak alias. Update the weak-alias test case to
catch this.
Differential Revision: https://reviews.llvm.org/D34734
llvm-svn: 307194
The overal size of the data section (including BSS)
is otherwise not included in the wasm binary.
Differential Revision: https://reviews.llvm.org/D34657
llvm-svn: 306459
processFixupValue is called on every relaxation iteration. applyFixup
is only called once at the very end. applyFixup is then the correct
place to do last minute changes and value checks.
While here, do proper range checks again for fixup_arm_thumb_bl. We
used to do it, but dropped because of thumb2. We now do it again, but
use the thumb2 range.
llvm-svn: 306177
X86_64 COFF only has support for 32 bit pcrel relocations. Produce an
error on all others.
Note that gnu as has extended the relocation values to support
this. It is not clear if we should support the gnu extension.
llvm-svn: 306082
For whatever reason, when processing
.globl foo
foo:
.data
bar:
.long foo-bar
llvm-mc creates a relocation with the section:
0x0 IMAGE_REL_I386_REL32 .text
This is different than when the relocation is relative from the
beginning. For example, a file with
call foo
produces
0x0 IMAGE_REL_I386_REL32 foo
I would like to refactor the logic for converting "foo - ." into a
relative relocation so that it is shared with ELF. This is the first
step and just changes the coff implementation to match what ELF (and
COFF in the case of calls) does.
llvm-svn: 306063
There's nothing incorrect about emitting such relocations against
symbols defined in other objects. The code in EmitCOFFSec* was missing
the visitUsedExpr part of MCStreamer::EmitValueImpl, so these symbols
were not being registered with the object file assembler.
This will be used to make reduced test cases for LLD.
llvm-svn: 306057
It looks like that when this code was written recordRelocation could
be called with A-B where A and B are in the same section. The
expression evaluation logic these days makes sure those are folded, so
some of this code was dead.
llvm-svn: 306053
Without this cast the "char" overload of operator<< is
chosen and the values is output as an ascii rather than
an integer.
Differential Revision: https://reviews.llvm.org/D34486
llvm-svn: 306039
- Use auto where appropriate
- Use early return to reduce nesting
- Remove stray comment line
- Use C++ foreach over explicit iterator
Differential Revision: https://reviews.llvm.org/D34477
llvm-svn: 305971
The lld-x86_64-darwin13 is failing with:
error: unused function 'operator<<'
Wrap the declation in ifndef NDEBUG, which matches
what is done in MipsELFObjectWriter.cpp.
Differential Revision: https://reviews.llvm.org/D34384
llvm-svn: 305771
This fixes two build failures that only occur in certain
configurations:
- error: unused function 'operator<<'
- error: control reaches end of non-void function
Differential Revision: https://reviews.llvm.org/D34382
llvm-svn: 305770
This ensures that symbolic relocations are generated for stack
pointer manipulations.
These relocations are of type R_WEBASSEMBLY_GLOBAL_INDEX_LEB.
This change also adds support for reading relocations of this
type in WasmObjectFile.cpp.
Since its a globally imported symbol this does mean that
the get_global/set_global instruction won't be valid until
the objects are linked that global used in no longer an
imported global.
Differential Revision: https://reviews.llvm.org/D34172
llvm-svn: 305616
Previously we were writing the value function index space
value but for these types of relocations we want to be
writing the table element index space value.
Add a test case for these relocation types that fails
without this change.
Differential Revision: https://reviews.llvm.org/D33962
llvm-svn: 305253
When an empty comment is present in an assembly file, the compiler will crash because it checks the first character for '\n' or '\r'.
The fix consists of also checking if the string is empty before accessing the *front* method of the StringRef.
A test is included for the x86 target, but this issue is reproducible with other targets as well.
Patch by Alexandru Guduleasa!
Reviewers: niravd, grosbach, llvm-commits
Reviewed By: niravd
Differential Revision: https://reviews.llvm.org/D33993
llvm-svn: 305077
This is a preparatory change to expose the debug compression style to
clang. It requires exposing the enumeration and passing the actual
value through to the backend from the frontend in actual value form
rather than a boolean that selects the GNU style of debug info
compression.
Minor tweak to the ELF Object Writer to use a variable for re-used
values. Add an assertion that debug information format is one of the
two currently known types if debug information is being compressed.
llvm-svn: 305038
This creates a new library called BinaryFormat that has all of
the headers from llvm/Support containing structure and layout
definitions for various types of binary formats like dwarf, coff,
elf, etc as well as the code for identifying a file from its
magic.
Differential Revision: https://reviews.llvm.org/D33843
llvm-svn: 304864
The change cleans up and unifies the handling of relocation
entries in WasmObjectWriter. Type index relocation no longer
need to be handled separately.
The only externally visible change should be that type
index relocations are no longer grouped at the end.
Differential Revision: https://reviews.llvm.org/D33918
llvm-svn: 304816
These methods looks like they were originally came from
MCELFObjectTargetWriter but they are never called by the
WasmObjectWriter.
Remove these methods meant the declaration of WasmRelocationEntry
could also move into the cpp file.
Differential Revision: https://reviews.llvm.org/D33905
llvm-svn: 304804
I did this a long time ago with a janky python script, but now
clang-format has built-in support for this. I fed clang-format every
line with a #include and let it re-sort things according to the precise
LLVM rules for include ordering baked into clang-format these days.
I've reverted a number of files where the results of sorting includes
isn't healthy. Either places where we have legacy code relying on
particular include ordering (where possible, I'll fix these separately)
or where we have particular formatting around #include lines that
I didn't want to disturb in this patch.
This patch is *entirely* mechanical. If you get merge conflicts or
anything, just ignore the changes in this patch and run clang-format
over your #include lines in the files.
Sorry for any noise here, but it is important to keep these things
stable. I was seeing an increasing number of patches with irrelevant
re-ordering of #include lines because clang-format was used. This patch
at least isolates that churn, makes it easy to skip when resolving
conflicts, and gets us to a clean baseline (again).
llvm-svn: 304787
The size of this function was getting a little out of.
control. Split code for writing each section type into
seperate functions.
Differential Revision: https://reviews.llvm.org/D33792
llvm-svn: 304634
Undefined externals don't need to have a size or an offset.
This was broken by r303915. Added a test for this case.
This fixes the "Compile LLVM Torture (o)" step on the wasm
waterfall.
Differential Revision: https://reviews.llvm.org/D33803
llvm-svn: 304505
This is the beginning of an effort to move the codeview yaml
reader / writer into ObjectYAML so that it can be shared.
Currently the only consumer / producer of CodeView YAML is
llvm-pdbdump, but CodeView can exist outside of PDB files, and
indeed is put into object files and passed to the linker to
produce PDB files. Furthermore, there are subtle differences
in the types of records that show up in object file CodeView
vs PDB file CodeView, but they are otherwise 99% the same.
By having this code in ObjectYAML, we can have llvm-pdbdump
reuse this code, while teaching obj2yaml and yaml2obj to use
this syntax for dealing with object files that can contain
CodeView.
This patch only adds support for CodeView type information
to ObjectYAML. Subsequent patches will add support for
CodeView symbol information.
llvm-svn: 304248
Also, include global entries for all data symbols, not
just external ones, since these are referenced by the
relocation records.
Add a test case that includes unnamed data.
Differential Revision: https://reviews.llvm.org/D33079
llvm-svn: 303915
Re-applying now that PR32825 which was raised on the commit this fixed up is now known to have also been fixed by this commit.
Original commit message:
Multiple ldr pseudoinstructions with the same constant value will
reuse the same constant pool entry. However, if the constant pool
is explicitly flushed with a .ltorg directive, we should not try
to reference constants in the previous pool any longer, since they
may be out of range.
This fixes assembling hand-written assembler source which repeatedly
loads the same constant value, across a binary size larger than the
pc-relative fixup range for ldr instructions (4096 bytes). Such
assembler source already uses explicit .ltorg instructions to emit
constant pools with regular intervals. However if we try to reuse
constants emitted in earlier pools, they end up out of range.
This makes the output of the testcase match what binutils gas does
(prior to this patch, it would fail to assemble).
Differential Revision: https://reviews.llvm.org/D32847
llvm-svn: 303540
Re-applying now that the open bug on this commit, PR32825, is known to be fixed.
Original commit message:
Summary: This patch returns the same label if the CP entry with the same value has been created.
Reviewers: eli.friedman, rengolin, jmolloy
Subscribers: majnemer, jmolloy, llvm-commits
Differential Revision: https://reviews.llvm.org/D25804
llvm-svn: 303539
This reverts commit r302416. This was a fixup for r286006, which has now been reverted so this doesn't apply (either in concept or in code).
This commit itself has no problems, but the underlying issue it was fixing has now disappeared from the codebase.
llvm-svn: 303536
Saleem Abdulrasool