Commit Graph

2698 Commits

Author SHA1 Message Date
Rafael Espindola d11591b293 Commit back the correct bits of r222760 (was r222538).
I also added a test.

Original message:

Allow FDE references outside the +/-2GB range supported by PC relative
offsets for code models other than small/medium. For JIT application,
memory layout is less controlled and can result in truncations
otherwise.

Patch from Akos Kiss.

Differential Revision: http://reviews.llvm.org/D6079

llvm-svn: 222897
2014-11-27 17:13:56 +00:00
Rafael Espindola b3323f0bd9 Revert "Reapply 222538 and update tests to explicitly request small code model and PIC:"
This reverts commit r222760.

It changed our behaviour on PIC so we don't match gas anymore. It also
included lots of unnecessary changes to tests.

If those changes are desirable, there should be an independent discussion
as they are out of scope for that patch.

I will recommit the other bits.

llvm-svn: 222896
2014-11-27 17:13:51 +00:00
Joerg Sonnenberger cf0ea262b1 Reapply 222538 and update tests to explicitly request small code model
and PIC:

Allow FDE references outside the +/-2GB range supported by PC relative
offsets for code models other than small/medium. For JIT application,
memory layout is less controlled and can result in truncations
otherwise.

Patch from Akos Kiss.

Differential Revision: http://reviews.llvm.org/D6079

llvm-svn: 222760
2014-11-25 13:37:55 +00:00
Simon Pilgrim a279410ede Tidied up target triple OS detection. NFC
Use Triple::isOS*() helper functions where possible.

llvm-svn: 222622
2014-11-22 19:12:10 +00:00
Duncan P. N. Exon Smith 44b82359c9 Revert "Allow FDE references outside the +/-2GB range supported by PC relative offsets for code models other than small/medium. For JIT application, memory layout is less controlled and can result in truncations otherwise."
This reverts commit r222538.

It's causing test failures for CFI, at least on Darwin:

http://lab.llvm.org:8080/green/job/clang-stage1-cmake-RA-incremental/1189/
http://lab.llvm.org:8080/green/job/clang-stage1-configure-RA_check/1391/

Note that the previous incremental build was on r222537, and the CFI
tests weren't failing:
http://lab.llvm.org:8080/green/job/clang-stage1-cmake-RA-incremental/1188/

llvm-svn: 222542
2014-11-21 17:21:18 +00:00
Joerg Sonnenberger f769ae1ac4 Allow FDE references outside the +/-2GB range supported by PC relative
offsets for code models other than small/medium. For JIT application,
memory layout is less controlled and can result in truncations
otherwise. 

Patch from Akos Kiss.

Differential Revision: http://reviews.llvm.org/D6079

llvm-svn: 222538
2014-11-21 14:42:43 +00:00
David Blaikie 5106ce7897 Remove StringMap::GetOrCreateValue in favor of StringMap::insert
Having two ways to do this doesn't seem terribly helpful and
consistently using the insert version (which we already has) seems like
it'll make the code easier to understand to anyone working with standard
data structures. (I also updated many references to the Entry's
key and value to use first() and second instead of getKey{Data,Length,}
and get/setValue - for similar consistency)

Also removes the GetOrCreateValue functions so there's less surface area
to StringMap to fix/improve/change/accommodate move semantics, etc.

llvm-svn: 222319
2014-11-19 05:49:42 +00:00
Frederic Riss 3f1a0a7ce2 COFF: Add support for Dwarf accelerator tables.
This allows COFF targets to emit accelerator tables
when requested by -dwarf-accel-tables=Enable instead
of aborting. The test DebugInfo/cross-cu-inlining.ll
covers this on COFF platforms.

llvm-svn: 222034
2014-11-14 20:33:40 +00:00
Rafael Espindola 6c933979d3 Fix a regression on the disassembling C API.
The fix is easy. Unfortunately, we had 0 tests, so adding one was somewhat
complicated.

Thanks to Kevin Enderby for the report.

llvm-svn: 221899
2014-11-13 16:52:07 +00:00
Justin Hibbits a88b605721 Add support for small-model PIC for PowerPC.
Summary:
Large-model was added first.  With the addition of support for multiple PIC
models in LLVM, now add small-model PIC for 32-bit PowerPC, SysV4 ABI.  This
generates more optimal code, for shared libraries with less than about 16380
data objects.

Test Plan: Test cases added or updated

Reviewers: joerg, hfinkel

Reviewed By: hfinkel

Subscribers: jholewinski, mcrosier, emaste, llvm-commits

Differential Revision: http://reviews.llvm.org/D5399

llvm-svn: 221791
2014-11-12 15:16:30 +00:00
Rafael Espindola cac0088e91 Remove the now unused StringRefMemoryObject.h.
llvm-svn: 221755
2014-11-12 02:13:27 +00:00
Rafael Espindola 7fc5b87480 Pass an ArrayRef to MCDisassembler::getInstruction.
With this patch MCDisassembler::getInstruction takes an ArrayRef<uint8_t>
instead of a MemoryObject.

Even on X86 there is a maximum size an instruction can have. Given
that, it seems way simpler and more efficient to just pass an ArrayRef
to the disassembler instead of a MemoryObject and have it do a virtual
call every time it wants some extra bytes.

llvm-svn: 221751
2014-11-12 02:04:27 +00:00
David Majnemer 2cc4bc77bf MC, COFF: Use relocations for function references inside the section
Referencing one symbol from another in the same section does not
generally require a relocation.  However, the MS linker has a feature
called /INCREMENTAL which enables incremental links.  It achieves this
by creating thunks to the actual function and redirecting all
relocations to point to the thunk.

This breaks down with the old scheme if you have a function which
references, say, itself.  On x86_64, we would use %rip relative
addressing to reference the start of the function from out current
position.  This would lead to miscompiles because other references might
reference the thunk instead, breaking function pointer equality.

This fixes PR21520.

llvm-svn: 221678
2014-11-11 08:43:57 +00:00
Rafael Espindola 804f43c655 Add const. NFC.
This adds const to a few methods that already return const references or
creates a const version when they reterun non-const references.

llvm-svn: 221666
2014-11-11 05:11:47 +00:00
Nico Weber 7f654a8e8f speling.
llvm-svn: 221652
2014-11-11 01:13:42 +00:00
Rafael Espindola 1d7d4eb15c Use a StringRefMemoryObject. NFC.
llvm-svn: 221503
2014-11-07 01:09:51 +00:00
Petar Jovanovic 35f05747f3 [mips64] Fix MIPS64 exception personality encoding
Remove dynamic relocations of __gxx_personality_v0 from the .eh_frame.
The MIPS64 follow-up of the MIPS32 fix (rL209907).

Patch by Vladimir Stefanovic.

Differential Revision: http://reviews.llvm.org/D6141

llvm-svn: 221408
2014-11-05 22:42:31 +00:00
Rafael Espindola bfd0f01dd7 Don't produce relocations for a difference in a section with no symbols.
We were producing a relocation for
----------------
.section foo,bar
La:
Lb:
 .long   La-Lb
--------------

but not for

---------------------
  .section foo,bar
zed:
La:
Lb:
 .long   La-Lb
----------------

This patch handles the case where both fragments are part of the first atom
in a section and there is no corresponding symbol to that atom.

This fixes pr21328.

llvm-svn: 221304
2014-11-04 22:10:33 +00:00
Oliver Stannard cf6bfb1dd0 Revert r221150, as it broke sanitizer tests
llvm-svn: 221151
2014-11-03 12:19:03 +00:00
Oliver Stannard 652ec6ee89 Emit .eh_frame with relocations to functions, rather than sections
When LLVM emits DWARF call frame information, it currently creates a local,
section-relative symbol in the code section, which is pointed to by a
relocation on the .eh_frame section. However, for C++ we emit some functions in
section groups, and the SysV ABI has some rules to make it easier to remove
these sections
(http://www.sco.com/developers/gabi/latest/ch4.sheader.html#section_group_rules):

  A symbol table entry with STB_LOCAL binding that is defined relative to one
  of a group's sections, and that is contained in a symbol table section that is
  not part of the group, must be discarded if the group members are discarded.
  References to this symbol table entry from outside the group are not allowed.

This means that we need to use the function symbol for the relocation, not a
temporary symbol.

There was a comment in the code claiming that the local symbol was used to
avoid creating a relocation, but a relocation must be created anyway as the
code and CFI are in different sections.

llvm-svn: 221150
2014-11-03 12:02:51 +00:00
David Majnemer ac7dc6e701 Attempt to fix the build after r220439
llvm-svn: 220440
2014-10-22 22:46:05 +00:00
Derek Schuff 5f708e5ec8 [MC] Attach labels to existing fragments instead of using a separate fragment
Summary:
Currently when emitting a label, a new data fragment is created for it if the
current fragment isn't a data fragment.
This change instead enqueues the label and attaches it to the next fragment
(e.g. created for the next instruction) if possible.

When bundle alignment is not enabled, this has no functionality change (it
just results in fewer extra fragments being created). For bundle alignment,
previously labels would point to the beginning of the bundle padding instead
of the beginning of the emitted instruction. This was not only less efficient
(e.g. jumping to the nops instead of past them) but also led to miscalculation
of the address of the GOT (since MC uses a label difference rather than
emitting a "." symbol).

Fixes https://code.google.com/p/nativeclient/issues/detail?id=3982

Test Plan: regression test attached

Reviewers: jvoung, eliben

Subscribers: jfb, llvm-commits

Differential Revision: http://reviews.llvm.org/D5915

llvm-svn: 220439
2014-10-22 22:38:06 +00:00
Rafael Espindola f03ae4efa7 Drop support for an old version of ld64 (from darwin 9).
llvm-svn: 220310
2014-10-21 18:31:09 +00:00
Rafael Espindola c606bfe660 Fix a bit of confusion about .set and produce more readable assembly.
Every target we support has support for assembly that looks like

a = b - c
.long a

What is special about MachO is that the above combination suppresses the
production of a relocation.

With this change we avoid producing the intermediary labels when they don't
add any value.

llvm-svn: 220256
2014-10-21 01:17:30 +00:00
Rafael Espindola b66130209b Add back commits r219835 and a fixed version of r219829.
The only difference from r219829 is using

getOrCreateSectionSymbol(*ELFSec)

instead of

GetOrCreateSymbol(ELFSec->getSectionName())

in ELFObjectWriter which causes us to use the correct section symbol even if
we have multiple sections with the same name.

Original messages:

r219829:
Correctly handle references to section symbols.

When processing assembly like

.long .text

we were creating a new undefined symbol .text. GAS on the other hand would
handle that as a reference to the .text section.

This patch implements that by creating the section symbols earlier so that
they are visible during asm parsing.

The patch also updates llvm-readobj to print the symbol number in the relocation
dump so that the test can differentiate between two sections with the same name.

r219835:
Allow forward references to section symbols.

llvm-svn: 220021
2014-10-17 01:48:58 +00:00
Rafael Espindola 4544a4062c Revert commit r219835 and r219829.
Revert "Correctly handle references to section symbols."
Revert "Allow forward references to section symbols."

Rui found a regression I am debugging.

llvm-svn: 220010
2014-10-17 01:06:02 +00:00
Rafael Espindola 78206c3576 Allow forward references to section symbols.
llvm-svn: 219835
2014-10-15 19:30:18 +00:00
Rafael Espindola a74b5e6823 Correctly handle references to section symbols.
When processing assembly like

.long .text

we were creating a new undefined symbol .text. GAS on the other hand would
handle that as a reference to the .text section.

This patch implements that by creating the section symbols earlier so that
they are visible during asm parsing.

The patch also updates llvm-readobj to print the symbol number in the relocation
dump so that the test can differentiate between two sections with the same name.

llvm-svn: 219829
2014-10-15 18:55:30 +00:00
Derek Schuff 05fb735f3a [MC] Make bundle alignment mode setting idempotent and support nested bundles
Summary:
Currently an error is thrown if bundle alignment mode is set more than once
per module (either via the API or the .bundle_align_mode directive). This
change allows setting it multiple times as long as the alignment doesn't
change.

Also nested bundle_lock groups are currently not allowed. This change allows
them, with the effect that the group stays open until all nests are exited,
and if any of the bundle_lock directives has the align_to_end flag, the
group becomes align_to_end.

These changes make the bundle aligment simpler to use in the compiler, and
also better match the corresponding support in GNU as.

Reviewers: jvoung, eliben

Differential Revision: http://reviews.llvm.org/D5801

llvm-svn: 219811
2014-10-15 17:10:04 +00:00
Rafael Espindola 7b61ddfa6e Simplify handling of --noexecstack by using getNonexecutableStackSection.
llvm-svn: 219799
2014-10-15 16:12:52 +00:00
Rafael Espindola ad33dd2914 Move getNonexecutableStackSection up to the base ELF class.
The .note.GNU-stack section is not SystemZ/X86 specific.

llvm-svn: 219796
2014-10-15 15:44:16 +00:00
Rafael Espindola c57477912a Remove method that is identical to the base class one.
llvm-svn: 219700
2014-10-14 17:38:38 +00:00
Benjamin Kramer dd13643b97 MC: Shrink MCSymbolRefExpr by only storing the bits we need.
32 -> 16 bytes on x86_64. NFC.

llvm-svn: 219574
2014-10-11 17:57:27 +00:00
Benjamin Kramer 3e67db92bc MC: Bit pack MCSymbolData.
On x86_64 this brings it from 80 bytes to 64 bytes. Also make any member
variables private and clean up uses to go through the existing accessors.

NFC.

llvm-svn: 219573
2014-10-11 15:07:21 +00:00
Sanjay Patel 352fb46d4f delete function name from comment
llvm-svn: 219443
2014-10-09 21:23:39 +00:00
Timur Iskhodzhanov 5fcaeebb72 Fix COFF section index relocation should be 16 bits, not 32
Original patch by Andrey Guskov!
http://reviews.llvm.org/D5651

llvm-svn: 219327
2014-10-08 18:01:49 +00:00
David Majnemer d7586046ee COFF: Don't oversize COMMON symbols when targeting BFD ld
COFF normally doesn't allow us to describe the alignment of COMMON
symbols.

It turns out that most linkers use the symbol size as a hint as to how
aligned the symbol should be.

However the BFD folks have added a .drectve command, which we
now support as of r219229, that allows us to specify the alignment
precisely.  With this in mind, stop rounding sizes up.

llvm-svn: 219281
2014-10-08 06:38:53 +00:00
Saleem Abdulrasool 64d491e488 MC: add support for -aligncomm GNU extension
The GNU linker supports an -aligncomm directive that allows for power-of-2
alignment of common data.  Add support to emit this directive.

llvm-svn: 219229
2014-10-07 19:37:57 +00:00
Yuri Gorshenin e8c81fd25a [asan-asm-instrumentation] CFI directives are generated for .S files.
Summary: CFI directives are generated for .S files.

Reviewers: eugenis

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D5520

llvm-svn: 219199
2014-10-07 11:03:09 +00:00
Hans Wennborg 1b1a399489 MachObjectWriter: optimize the string table for common suffices
This is a follow-up to r207670 (ELF) and r218636 (COFF).

Differential Revision: http://reviews.llvm.org/D5622

llvm-svn: 219126
2014-10-06 17:05:19 +00:00
Rafael Espindola 11527a1d71 Note that a gold bug has been fixed.
We should be able to stop working around it at some point in the future.

llvm-svn: 219115
2014-10-06 12:33:27 +00:00
Benjamin Kramer cb3e06ba00 MCParser: Modernize memory handling.
NFC.

llvm-svn: 218998
2014-10-03 18:32:55 +00:00
Daniel Sanders ef638fea2d [mips] Print warning when using register names not available in N32/64
Summary:
The register names t4-t7 are not available in the N32 and N64 ABIs.
This patch prints a warning, when those names are used in N32/64,
along with a fix-it with the correct register names.

Patch by Vasileios Kalintiris

Reviewers: dsanders

Reviewed By: dsanders

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D5272

llvm-svn: 218989
2014-10-03 15:37:37 +00:00
Bradley Smith 7a77075530 Extend C disassembler API to allow specifying target features
llvm-svn: 218682
2014-09-30 16:31:40 +00:00
Hans Wennborg f26bfc1671 WinCOFFObjectWriter: optimize the string table for common suffices
This is a follow-up from r207670 which did the same for ELF.

Differential Revision: http://reviews.llvm.org/D5530

llvm-svn: 218636
2014-09-29 22:43:20 +00:00
Hans Wennborg ba80b5d43c WinCOFFObjectWriter.cpp: make write_uint32_le more efficient
llvm-svn: 218574
2014-09-28 00:22:27 +00:00
Reid Kleckner 81782f0cb8 MC: Use @IMGREL instead of @IMGREL32, which we can't parse
Nico Rieck added support for this 32-bit COFF relocation some time ago
for Win64 stuff. It appears that as an oversight, the assembly output
used "foo"@IMGREL32 instead of "foo"@IMGREL, which is what we can parse.

Sadly, there were actually tests that took in IMGREL and put out
IMGREL32, and we didn't notice the inconsistency. Oh well. Now LLVM can
assemble it's own output with slightly more fidelity.

llvm-svn: 218437
2014-09-25 02:09:18 +00:00
Akira Hatanaka 8e77dbbf5a Revert r218380. This was breaking Apple internal build bots.
llvm-svn: 218409
2014-09-24 20:37:14 +00:00
Benjamin Kramer ce246a13ea Replace a hand-written suffix compare with std::lexicographical_compare.
No functionality change.

llvm-svn: 218380
2014-09-24 13:19:28 +00:00
Oliver Stannard 14f97d0017 Downgrade DWARF2 section limit error to a warning
We currently emit an error when trying to assemble a file with more
than one section using DWARF2 debug info. This should be a warning
instead, as the resulting file will still be usable, but with a
degraded debug illusion.

llvm-svn: 218241
2014-09-22 10:45:16 +00:00
Ehsan Akhgari db0e7061c6 ms-inline-asm: Add a sema callback for looking up label names
The implementation of the callback in clang's Sema will return an
internal name for labels.

Test Plan: Will be tested in clang.

Reviewers: rnk

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D4587

llvm-svn: 218229
2014-09-22 02:21:35 +00:00
David Majnemer 48227a3759 MC: Support aligned COMMON symbols for COFF
link.exe:
Fuzz testing has shown that COMMON symbols with size > 32 will always
have an alignment of at least 32 and all symbols with size < 32 will
have an alignment of at least the largest power of 2 less than the size
of the symbol.

binutils:
The BFD linker essentially work like the link.exe behavior but with
alignment 4 instead of 32.  The BFD linker also supports an extension to
COFF which adds an -aligncomm argument to the .drectve section which
permits specifying a precise alignment for a variable but MC currently
doesn't support editing .drectve in this way.

With all of this in mind, we decide to play a little trick: we can
ensure that the alignment will be respected by bumping the size of the
global to it's alignment.

llvm-svn: 218201
2014-09-21 09:18:07 +00:00
David Majnemer 7d0dc3ef18 MC: Fix MCSectionCOFF::PrintSwitchToSection
We had a few bugs:
- We were considering the GVKind instead of just looking at the section
  characteristics
- We would never print out 'y' when a section was meant to be unreadable
- We would never print out 's' when a section was meant to be shared
- We translated IMAGE_SCN_MEM_DISCARDABLE to 'n' when it should've meant
  IMAGE_SCN_LNK_REMOVE

llvm-svn: 218189
2014-09-20 20:40:50 +00:00
David Majnemer b8dbebb31c MC: Treat ReadOnlyWithRel and ReadOnlyWithRelLocal as ReadOnly for COFF
A problem with our old behavior becomes observable under x86-64 COFF
when we need a read-only GV which has an initializer which is referenced
using a relocation: we would mark the section as writable.  Marking the
section as writable interferes with section merging.

This fixes PR21009.

llvm-svn: 218179
2014-09-20 07:31:46 +00:00
Benjamin Kramer 04f9da8f21 Elide unnecessary DenseMap copy.
No functionality change.

llvm-svn: 218122
2014-09-19 12:26:38 +00:00
Yaron Keren d122211e60 Another required re-setting for MCStreamer::reset().
llvm-svn: 217970
2014-09-17 17:50:34 +00:00
Yaron Keren 559b47d051 Add and update reset() and doInitialization() methods to MC* and passes.
This enables reusing a PassManager instead of re-constructing it every time.

llvm-svn: 217948
2014-09-17 09:25:36 +00:00
Yaron Keren cca43c15b5 This add a reset method for WinCOFFObjectWriter, like other MC* classes.
llvm-svn: 217907
2014-09-16 21:31:04 +00:00
David Majnemer 15f7ed96ac Fix the build for MSVC, it doesn't support extended sizeof
llvm-svn: 217820
2014-09-15 20:28:38 +00:00
David Majnemer 4d57159c09 MC: Add support for BigObj
Teach WinCOFFObjectWriter how to write -mbig-obj style object files;
these object files allow for more sections inside an object file.

Our support for BigObj is notably different from binutils and cl: we
implicitly upgrade object files to BigObj instead of asking the user to
compile the same file *again* but with another flag.  This matches up
with how LLVM treats ELF variants.

This was tested by forcing LLVM to always emit BigObj files and running
the entire test suite.  A specific test has also been added.

I've lowered the maximum number of sections in a normal COFF file,
VS "14" CTP 3 supports no more than 65279 sections.  This is important
otherwise we might not switch to BigObj quickly enough, leaving us with
a COFF file that we couldn't link.

yaml2obj support is all that remains to implement.

Differential Revision: http://reviews.llvm.org/D5349

llvm-svn: 217812
2014-09-15 19:42:42 +00:00
David Majnemer 44f51e5113 Object: Add support for bigobj
This adds support for reading the "bigobj" variant of COFF produced by
cl's /bigobj and mingw's -mbig-obj.

The most significant difference that bigobj brings is more than 2**16
sections to COFF.

bigobj brings a few interesting differences with it:
- It doesn't have a Characteristics field in the file header.
- It doesn't have a SizeOfOptionalHeader field in the file header (it's
  only used in executable files).
- Auxiliary symbol records have the same width as a symbol table entry.
  Since symbol table entries are bigger, so are auxiliary symbol
  records.

Write support will come soon.

Differential Revision: http://reviews.llvm.org/D5259

llvm-svn: 217496
2014-09-10 12:51:52 +00:00
Saleem Abdulrasool fcefa21b08 MC: correct DWARF line info for PE/COFF
DWARF address ranges contain a reference to the debug_info section.  This offset
is an absolute relocation except on non-PE/COFF targets where it is section
relative.  We would emit this incorrectly, and trying to map the debug info from
the address would fail.

llvm-svn: 217317
2014-09-06 19:57:48 +00:00
Saleem Abdulrasool 5c70de1072 MC: correct DWARF header for PE/COFF assembly input
The header contains an offset to the DWARF line table for the CU.  The offset
must be section relative for COFF and absolute for others.  The non-assembly
code path for the DWARF header generation already has the correct emission for
the headers.  This corrects the assembly input path.

This was identified by BFD objecting to the LLVM generated DWARF information.

llvm-svn: 217222
2014-09-05 04:15:00 +00:00
Reid Kleckner 7c4059eb89 MC Win64: Put unwind info for COMDAT code into the same COMDAT group
Summary:
This fixes a long standing issue where we would emit many little .text
sections and only one .pdata and .xdata section. Now we generate one
.pdata / .xdata pair per .text section and associate them correctly.

Fixes PR19667.

Reviewers: majnemer

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D5181

llvm-svn: 217176
2014-09-04 17:42:03 +00:00
Benjamin Kramer 8c90fd71f7 Add override to overriden virtual methods, remove virtual keywords.
No functionality change. Changes made by clang-tidy + some manual cleanup.

llvm-svn: 217028
2014-09-03 11:41:21 +00:00
Sean Silva 888320e9fa Nuke MCAnalysis.
The code is buggy and barely tested. It is also mostly boilerplate.
(This includes MCObjectDisassembler, which is the interface to that
functionality)

Following an IRC discussion with Jim Grosbach, it seems sensible to just
nuke the whole lot of functionality, and dig it up from VCS if
necessary (I hope not!).

All of this stuff appears to have been added in a huge patch dump (look
at the timeframe surrounding e.g. r182628) where almost every patch
seemed to be untested and not reviewed before being committed.
Post-review responses to the patches were never addressed. I don't think
any of it would have passed pre-commit review.

I doubt anyone is depending on this, since this code appears to be
extremely buggy. In limited testing that Michael Spencer and I did, we
couldn't find a single real-world object file that wouldn't crash the
CFG reconstruction stuff. The symbolizer stuff has O(n^2) behavior and
so is not much use to anyone anyway. It seemed simpler to remove them as
a whole. Most of this code is boilerplate, which is the only way it was
able to scrape by 60% coverage.

HEADSUP: Modules folks, some files I nuked were referenced from
include/llvm/module.modulemap; I just deleted the references. Hopefully
that is the right fix (one was a FIXME though!).

llvm-svn: 216983
2014-09-02 22:32:20 +00:00
Pete Cooper 1175945710 Change MCSchedModel to be a struct of statically initialized data.
This removes static initializers from the backends which generate this data, and also makes this struct match the other Tablegen generated structs in behaviour

Reviewed by Andy Trick and Chandler C

llvm-svn: 216919
2014-09-02 17:43:54 +00:00
Alexey Samsonov 1b0713ce09 Fix left shifts by too large exponents in MCParser
(which happened only on error recovery path).

This bug was reported by UBSan.

llvm-svn: 216915
2014-09-02 17:25:29 +00:00
Saleem Abdulrasool d458091907 MC: remove unnecessary enumeration prefix
This is an enum class, and will be appropriately prefixed, making the encoding
type prefix redundant.  No change to any uses as the use of this was not yet
introduced.

llvm-svn: 216893
2014-09-01 23:48:29 +00:00
Craig Topper 6dc4a8bc2c Fix some cases where StringRef was being passed by const reference. Remove const from some other StringRefs since its implicitly const already.
llvm-svn: 216820
2014-08-30 16:48:02 +00:00
Aaron Ballman a4aa0d7cc0 Silence a -Wsign-compare warning. NFC.
llvm-svn: 216666
2014-08-28 13:23:26 +00:00
David Majnemer 9ab5ff1c5b MC: Don't crash when the COFF section limit is reached
I've decided not to commit a test, it takes 2.5 seconds to run on my an
incredibly strong machine.

llvm-svn: 216647
2014-08-28 04:02:50 +00:00
Rafael Espindola 3560ff2c1f Return a std::unique_ptr when creating a new MemoryBuffer.
llvm-svn: 216583
2014-08-27 20:03:13 +00:00
Rafael Espindola 9eef18c58c Remove unused argument.
llvm-svn: 216580
2014-08-27 19:49:03 +00:00
Craig Topper e1d1294853 Simplify creation of a bunch of ArrayRefs by using None, makeArrayRef or just letting them be implicitly created.
llvm-svn: 216525
2014-08-27 05:25:25 +00:00
Joerg Sonnenberger 2981591f7f Convert MC command line option for fatal assembler warnings into a
proper flag.

llvm-svn: 216471
2014-08-26 18:39:50 +00:00
Rafael Espindola 3fd1e9933f Modernize raw_fd_ostream's constructor a bit.
Take a StringRef instead of a "const char *".
Take a "std::error_code &" instead of a "std::string &" for error.

A create static method would be even better, but this patch is already a bit too
big.

llvm-svn: 216393
2014-08-25 18:16:47 +00:00
David Blaikie 1961f14cf9 Explicitly pass ownership of the MemoryBuffer to AddNewSourceBuffer using std::unique_ptr
llvm-svn: 216223
2014-08-21 20:44:56 +00:00
Alexey Samsonov e5864c69a8 Don't allow MCStreamer::EmitIntValue to output 0-byte integers.
It makes no sense and can hide bugs. In particular, it lead
to left shift by 64 bits, which is an undefined behavior,
properly reported by UBSan.

llvm-svn: 216134
2014-08-20 22:46:38 +00:00
Rafael Espindola 1c509715e6 Remove unused field.
llvm-svn: 216086
2014-08-20 17:33:44 +00:00
Tim Northover 26bb14e6a7 TableGen: allow use of uint64_t for available features mask.
ARM in particular is getting dangerously close to exceeding 32 bits worth of
possible subtarget features. When this happens, various parts of MC start to
fail inexplicably as masks get truncated to "unsigned".

Mostly just refactoring at present, and there's probably no way to test.

llvm-svn: 215887
2014-08-18 11:49:42 +00:00
Rafael Espindola f43a94e75e Remove unused member variable.
llvm-svn: 215860
2014-08-17 22:48:55 +00:00
Rafael Espindola c23174b990 Make EmitAbsValue an static helper.
llvm-svn: 215721
2014-08-15 15:12:13 +00:00
Rafael Espindola 7bb91d942b Delete dead code. NFC.
llvm-svn: 215720
2014-08-15 14:58:22 +00:00
Rafael Espindola 5e955fbd27 Make EmitDwarfSetLineAddr an static helper. NFC.
llvm-svn: 215718
2014-08-15 14:43:02 +00:00
Rafael Espindola 3851808e40 Make BuildSymbolDiff an static helper.
llvm-svn: 215717
2014-08-15 14:31:47 +00:00
Rafael Espindola ed735d3360 Make ForceExpAbs an static helper.
llvm-svn: 215715
2014-08-15 14:24:41 +00:00
Rafael Espindola adbe02435d Add a helper to MCExpr for when an expression is know to be absolute.
llvm-svn: 215713
2014-08-15 14:20:32 +00:00
Rafael Espindola d610ba99cb Remove HasLEB128.
We already require CFI, so it should be safe to require .leb128 and .uleb128.

llvm-svn: 215712
2014-08-15 14:01:07 +00:00
Rafael Espindola fe963b1764 Don't print comments to an object streamer :-)
llvm-svn: 215689
2014-08-15 03:07:13 +00:00
Rafael Espindola 91f6621edb EmitAbsValue is the same as EmitValue on non-darwin. NFC.
llvm-svn: 215688
2014-08-15 02:51:31 +00:00
Saleem Abdulrasool bb67af44e1 MC: AsmLexer: handle multi-character CommentStrings correctly
As X86MCAsmInfoDarwin uses '##' as CommentString although a single '#' starts a
comment a workaround for this special case is added.

Fixes divisions in constant expressions for the AArch64 assembler and other
targets which use '//' as CommentString.

Patch by Janne Grunau!

llvm-svn: 215615
2014-08-14 02:51:43 +00:00
Benjamin Kramer a7c40ef022 Canonicalize header guards into a common format.
Add header guards to files that were missing guards. Remove #endif comments
as they don't seem common in LLVM (we can easily add them back if we decide
they're useful)

Changes made by clang-tidy with minor tweaks.

llvm-svn: 215558
2014-08-13 16:26:38 +00:00
Reid Kleckner 21aedc4b83 MC: Diagnose an unexpected token in COFF .section instead of asserting
This can easily arise when trying to assemble and ELF style .section
directive for a COFF object file.

llvm-svn: 215373
2014-08-11 18:34:43 +00:00
Hans Wennborg 4fa2fd12ca SubTargetFeature.cpp: it seems the size of this SmallVector should be 3
because some subtarget feature strings have three components.

llvm-svn: 215339
2014-08-11 02:21:32 +00:00
Joerg Sonnenberger b696d46045 Fix tabs.
llvm-svn: 215311
2014-08-10 11:37:07 +00:00
Joerg Sonnenberger 752b91bd82 If available, pass down the Fixup object to EvaluateAsRelocatable.
At least on PowerPC, the interpretation of certain modifiers depends on
the context they appear in.

llvm-svn: 215310
2014-08-10 11:35:12 +00:00
Saleem Abdulrasool 1d0d00f4e4 MC: remove duplicated code
This removes the duplicate definition of GetXDataSection.  This function is
available as a static method and is identical to the previous implementation.
This just cleans up the unnecessary duplication.

llvm-svn: 215289
2014-08-09 17:21:36 +00:00
Saleem Abdulrasool 87a54c46b0 MC: cleanup includes
Cleanup Win64EH header inclusion.  NFC.

llvm-svn: 215288
2014-08-09 17:21:33 +00:00
Saleem Abdulrasool 64a8cc7d0d MC: split Win64EHUnwindEmitter into a shared streamer
This changes Win64EHEmitter into a utility WinEH UnwindEmitter that can be
shared across multiple architectures and a target specific bit which is
overridden (Win64::UnwindEmitter).  This enables sharing the section selection
code across X86 and the intended use in ARM for emitting unwind information for
Windows on ARM.

llvm-svn: 215050
2014-08-07 02:59:41 +00:00
Kevin Enderby e3c13468bf Enable Darwin vararg parameters support in assembler macros.
Duplicate the vararg tests for linux and add a tests which mixed
vararg arguments with darwin positional parameters.

Patch by: Janne Grunau <j@jannau.net>

llvm-svn: 214799
2014-08-04 23:14:37 +00:00
Saleem Abdulrasool 4544c16eab MC: virtualise EmitWindowsUnwindTables
This makes EmitWindowsUnwindTables a virtual function and lowers the
implementation of the function to the X86WinCOFFStreamer.  This method is a
target specific operation.  This enables making the behaviour target dependent
by isolating it entirely to the target specific streamer.

llvm-svn: 214664
2014-08-03 18:51:26 +00:00
Saleem Abdulrasool b3be7371d5 MC: rename Win64EHFrameInfo to WinEH::FrameInfo
The frame information stored in this structure is driven by the requirements for
Windows NT unwinding rather than Windows 64 specifically.  As a result, this
type can be shared across multiple architectures (ARM, AXP, MIPS, PPC, SH).
Rename this class in preparation for adding support for supporting unwinding
information for Windows on ARM.

Take the opportunity to constify the members as everything except the
ChainedParent is read-only.  This required some adjustment to the label
handling.

llvm-svn: 214663
2014-08-03 18:51:17 +00:00
Philip Reames 7684618401 Add support for StackMap section for ELF/Linux systems
This patch adds code to emits the StackMap section on ELF systems. This section is required to support llvm.experimental.stackmap and llvm.experimental.patchpoint intrinsics.

Reviewers: ributzka, echristo

Differential Revision: http://reviews.llvm.org/D4574

llvm-svn: 214538
2014-08-01 18:47:09 +00:00
Eric Christopher 59265af9eb Revert "Remove MCObjectDisassembler.cpp as it is untested and unused." as it is apparently used, but the build didn't return errors weirdly.
This reverts commits 214437 and 214438.

llvm-svn: 214444
2014-07-31 21:18:38 +00:00
Aaron Ballman 3866a8f2ca Fixing CMake problems with MCObjectDisassembler.cpp not existing.
llvm-svn: 214438
2014-07-31 20:48:54 +00:00
Eric Christopher 90a06fa97a Remove MCObjectDisassembler.cpp as it is untested and unused.
llvm-svn: 214437
2014-07-31 20:44:46 +00:00
Rafael Espindola 3f0549f66b Move MCObjectSymbolizer.h to MC/MCAnalysis.
The cpp file is already in lib/MC/MCAnalysis.

llvm-svn: 214424
2014-07-31 19:29:23 +00:00
Eric Christopher 5a298679d5 Fix loop end condition.
Note: This code appears to be untested.
llvm-svn: 214416
2014-07-31 18:28:08 +00:00
David Blaikie 29459ae83c Reapply "DebugInfo: Don't put fission type units in comdat sections."
This recommits r208930, r208933, and r208975 (by reverting r209338) and
reverts r209529 (the FIXME to readd this functionality once the tools
were fixed) now that DWP has been fixed to cope with a single section
for all fission type units.

Original commit message:

"Since type units in the dwo file are handled by a debug aware tool,
they don't need to leverage the ELF comdat grouping to implement
deduplication. Avoid creating all the .group sections for these as a
space optimization."

llvm-svn: 213956
2014-07-25 17:11:58 +00:00
Joerg Sonnenberger 6637d4e2e7 Use the same .eh_frame encoding for 32bit PPC as on i386.
llvm-svn: 213890
2014-07-24 19:25:16 +00:00
Nico Weber 155dccd1eb Let the integrated assembler understand .exitm, PR20426.
llvm-svn: 213876
2014-07-24 17:08:39 +00:00
Nico Weber 2a8f922b1c Remove unused field MacroInstantiation::TheMacro. No behavior change.
llvm-svn: 213874
2014-07-24 16:29:04 +00:00
Nico Weber 404012b7dc Let the integrated assembler understand .warning, PR20428.
llvm-svn: 213873
2014-07-24 16:26:06 +00:00
Rafael Espindola 5addace56d Finish inverting the MC -> Object dependency.
There were still some disassembler bits in lib/MC, but their use of Object
was only visible in the includes they used, not in the symbols.

llvm-svn: 213808
2014-07-23 22:26:07 +00:00
Tim Northover e19bed7d33 AArch64: remove arm64 triple enumerator.
Having both Triple::arm64 and Triple::aarch64 is extremely confusing, and
invites bugs where only one is checked. In reality, the only legitimate
difference between the two (arm64 usually means iOS) is also present in the OS
part of the triple and that's what should be checked.

We still parse the "arm64" triple, just canonicalise it to Triple::aarch64, so
there aren't any LLVM-side test changes.

llvm-svn: 213743
2014-07-23 12:32:47 +00:00
Ulrich Weigand 46797c6960 [MC] Pass MCSymbolData to needsRelocateWithSymbol
As discussed in a previous checking to support the .localentry
directive on PowerPC, we need to inspect the actual target symbol
in needsRelocateWithSymbol to make the appropriate decision based
on that symbol's st_other bits.

Currently, needsRelocateWithSymbol does not get the target symbol.
However, it is directly available to its sole caller.  This patch
therefore simply extends the needsRelocateWithSymbol by a new
parameter "const MCSymbolData &SD", passes in the target symbol,
and updates all derived implementations.

In particular, in the PowerPC implementation, this patch removes
the FIXME added by the previous checkin.

llvm-svn: 213487
2014-07-20 23:15:06 +00:00
Saleem Abdulrasool 00426d9c19 MC: permit emitting a symbol value as section relative
This adds an optional parameter to the EmitSymbolValue method in MCStreamer to
permit emitting a symbol value as a section relative value.  This is to cover
the use in MCDwarf which should not really know about how to emit a section
relative value for a given target.

This addresses post-review comments from Eric Christopher in SVN r213275.

llvm-svn: 213463
2014-07-19 21:01:58 +00:00
David Peixotto b0b3e66ed4 Fix build failure on windows
Add explicit constructor to struct instead of using brace initialization.

llvm-svn: 213389
2014-07-18 16:41:58 +00:00
David Peixotto ae5ba76221 MC: support different sized constants in constant pools
On AArch64 the pseudo instruction ldr <reg>, =... supports both
32-bit and 64-bit constants. Add support for 64 bit constants for
the pools to support the pseudo instruction fully.

Changes the AArch64 ldr-pseudo tests to use 32-bit registers and
adds tests with 64-bit registers.

Patch by Janne Grunau!

Differential Revision: http://reviews.llvm.org/D4279

llvm-svn: 213387
2014-07-18 16:05:14 +00:00
Nico Weber 42f79dbf02 ms inline asm: Don't add x86 segment registers to the clobber list.
Clang tries to check the clobber list but doesn't list segment registers in its
x86 register list. This fixes PR20343.

llvm-svn: 213303
2014-07-17 20:24:55 +00:00
Saleem Abdulrasool 7d09530cef MC: correct DWARF header for PE/COFF assembly input
The header contains an offset to the DWARF abbreviations for the CU.  The offset
must be section relative for COFF and absolute for others.  The non-assembly
code path for the DWARF header generation already had the correct emission for
the headers.  This corrects just the assembly path.  Due to the invalid
relocation, processing of the debug information would halt previously on the
first assembly input as the associated abbreviations would be out of range as
they would have the location increased by image base and the section offset.

This address PR20332.

llvm-svn: 213275
2014-07-17 16:27:44 +00:00
Saleem Abdulrasool 19f8bc65f6 MC: collapse emission of producer
Rather than use three EmitBytes, concatenate the string at compile time,
constructing a single StringRef and emitting the data in one shot.  This also
creates nicer assembly output.  NFC.

llvm-svn: 213273
2014-07-17 16:27:35 +00:00
Saleem Abdulrasool ab820860fa MC: make WinEH opcode an opaque value
This makes the opcode an opaque value (unsigned int) rather than the
enumeration.  This permits the use of target specific operands.

Split out the generic type into a MCWinEH header and add a supporting
MCWin64EH::Instruction to abstract out the selection of the opcode and
construction of the actual instruction.

llvm-svn: 213221
2014-07-17 03:08:50 +00:00
David Majnemer 8bce66b093 CodeGen: Stick constant pool entries in COMDAT sections for WinCOFF
COFF lacks a feature that other object file formats support: mergeable
sections.

To work around this, MSVC sticks constant pool entries in special COMDAT
sections so that each constant is in it's own section.  This permits
unused constants to be dropped and it also allows duplicate constants in
different translation units to get merged together.

This fixes PR20262.

Differential Revision: http://reviews.llvm.org/D4482

llvm-svn: 213006
2014-07-14 22:57:27 +00:00
Saleem Abdulrasool c7c3cb1f4e MC: make MCWin64EHInstruction a POD-like struct
This is the first of a number of changes designed to generalise
MCWin64EHInstruction to support different target architectures.  An ordered set
(vector) of these instructions is saved per frame to permit the emission of
information for Windows NT style unwinding.  The only bit of information which
is actually target specific here is the Opcode for the unwinding bytecode.  The
remainder of the information is simply generic information that is relevant to
the Windows NT unwinding model.

Remove the accessors for the fields, making them const and public instead.  Sink
the knowledge of the alias'ed name into the single source and sink a single-use
check method into the use.

llvm-svn: 212914
2014-07-13 19:03:45 +00:00
Saleem Abdulrasool 5705cd8cf6 MC: make helper function be more const-correct
Introduce const-ness on parameters, they are used as read-only and should not be
modified.  NFC.

llvm-svn: 212913
2014-07-13 19:03:40 +00:00
Saleem Abdulrasool 3f3cefd392 MC: make DWARF and Windows unwinding handling more similar
Rename member variables and functions for the MCStreamer for DWARF-like
unwinding management.  Rename the Windows ones as well and make the naming and
handling similar across the two.  No functional change intended.

llvm-svn: 212912
2014-07-13 19:03:36 +00:00
David Majnemer 299674e94f MC: Let non-temporary COFF aliases be in symtab
MC was aping a binutils bug where aliases would default their linkage to
private instead of internal.

I've sent a patch to the binutils maintainers and they've recently
applied it to the GNU assembler sources.

This fixes PR20152.

Differential Revision: http://reviews.llvm.org/D4395

llvm-svn: 212899
2014-07-13 04:31:19 +00:00
Saleem Abdulrasool db514056de MC: remove use of unnecessary variable
Due to the fact that the windows unwinding has the concept of chained frames, we
maintain a current frame info pointer that is adjusted on any push and pop of a
unwinding context.  This just removes an unnecessary variable that was used to
mirror the DWARF unwinding code.

llvm-svn: 212882
2014-07-12 20:49:13 +00:00
Saleem Abdulrasool 4a1a2f7790 MC: rename MCW64UnwindInfo to MCWinFrameInfo
This structure contains information related to the call frame used to generate
unwinding information.  Rename this to reflect the future use to represent the
shared state between various architectures for WinCFI information.

llvm-svn: 212881
2014-07-12 20:49:09 +00:00
Ulrich Weigand 0a51abc100 [MC] Constify MCELF::GetVisibility and MCELF::getOther
These two routines didn't take a "const MCSymbolData &SD"
like the other MCELF::Get routines for some reason ...

llvm-svn: 212834
2014-07-11 17:34:44 +00:00
Saleem Abdulrasool 1e76cbdff7 MC: modernise for loop
Convert a for loop to range bsaed form.  NFC.

llvm-svn: 212684
2014-07-10 04:50:09 +00:00
Saleem Abdulrasool 427c08d48b MC: add and use an accessor for WinCFI
This adds a utility method to access the WinCFI information in bulk and uses
that to iterate rather than requesting the count and individually iterating
them.  This is in preparation for restructuring WinCFI handling to enable more
clear sharing across architectures to enable unwind information emission for
Windows on ARM.

llvm-svn: 212683
2014-07-10 04:50:06 +00:00
Vladimir Medic fb8a2a95cd Mips.abiflags is a new implicitly generated section that will be present on all new modules. The section contains a versioned data structure which represents essentially information to allow a program loader to determine the requirements of the application. This patch implements mips.abiflags section and provides test cases for it.
llvm-svn: 212519
2014-07-08 08:59:22 +00:00
Rafael Espindola 8026bd0b2a This only needs a StringRef.
llvm-svn: 212401
2014-07-06 14:17:29 +00:00
Alp Toker a55b95b58a SourceMgr: make valid buffer IDs start from one
Use 0 for the invalid buffer instead of -1/~0 and switch to unsigned
representation to enable more idiomatic usage.

Also introduce a trivial SourceMgr::getMainFileID() instead of hard-coding 0/1
to identify the main file.

llvm-svn: 212398
2014-07-06 10:33:31 +00:00
David Majnemer 82cb0309e2 MC: make MCSymbolData::dump work on const objects
This just lets us dump a const MCSymbolData object, no functionality
changed.

llvm-svn: 212365
2014-07-05 00:39:52 +00:00
David Majnemer e0950ee85c MC: Correct comment in ExportSymbol
No functionality changed, just make it so that the code _could_ be
uncommented.

llvm-svn: 212363
2014-07-04 23:20:46 +00:00
David Majnemer bee5f754f2 MC: Cleanup COFFAsmParser::ParseSectionFlags
Switch a normal for-loop to a range-based for. No functionality changed.

llvm-svn: 212362
2014-07-04 23:15:28 +00:00
Rafael Espindola 97de474a36 Invert the MC -> Object dependency.
Now that we have a lib/MC/MCAnalysis, the dependency was there just because
of two helper classes. Move the two over to MC.

This will allow IRObjectFile to parse inline assembly.

llvm-svn: 212248
2014-07-03 02:01:39 +00:00
Rafael Espindola e1865a8e8c Fix configure+make build.
llvm-svn: 212210
2014-07-02 20:05:48 +00:00
Rafael Espindola cbc5ac7a7e Move CFG building code to a new lib/MC/MCAnalysis library.
The new library is 150KB on a Release+Asserts build, so it is quiet a bit of
code that regular users of MC don't need to link with now.

llvm-svn: 212209
2014-07-02 19:49:34 +00:00
Rafael Espindola 83120cdf68 Avoid revocations when possible.
This is a small targeted fix for pr20119. The code needs quiet a bit of
refactoring and I added some FIXMEs about it, but I want to get the testcase
passing first.

llvm-svn: 212101
2014-07-01 14:34:30 +00:00
Reid Kleckner b5dd9452b4 Fix .seh_stackalloc 0
seh_stackalloc 0 is not representable in Win64 SEH info, so emitting it
is a bug.

Reviewers: rnk

Differential Revision: http://reviews.llvm.org/D4334

Patch by Vadim Chugunov!

llvm-svn: 212081
2014-07-01 00:42:47 +00:00
Saleem Abdulrasool 7206a52522 MC: rename EmitWin64EH routines
Rename the routines to reflect the reality that they are more related to call
frame information than to Win64 EH. Although EH is implemented in an intertwined
manner by augmenting with an exception handler and an associated parameter, the
majority of these routines emit information required to unwind the frames. This
also helps identify that these routines are generic for most windows platforms
(they apply equally to nearly all architectures except x86) although the
encoding of the information is architecture dependent.

Unwinding data is emitted via EmitWinCFI* and exception handling information via
EmitWinEH*.

llvm-svn: 211994
2014-06-29 01:52:01 +00:00
David Majnemer c57d038240 MC: Fix associative sections on COFF
COFF sections in MC were represented by a tuple of section-name and
COMDAT-name.  This is not sufficient to represent a .text section
associated with another .text section; we need a way to distinguish
between the key section and the one marked associative.

llvm-svn: 211913
2014-06-27 17:19:44 +00:00
Alp Toker e69170a110 Revert "Introduce a string_ostream string builder facilty"
Temporarily back out commits r211749, r211752 and r211754.

llvm-svn: 211814
2014-06-26 22:52:05 +00:00
Alp Toker 614717388c Introduce a string_ostream string builder facilty
string_ostream is a safe and efficient string builder that combines opaque
stack storage with a built-in ostream interface.

small_string_ostream<bytes> additionally permits an explicit stack storage size
other than the default 128 bytes to be provided. Beyond that, storage is
transferred to the heap.

This convenient class can be used in most places an
std::string+raw_string_ostream pair or SmallString<>+raw_svector_ostream pair
would previously have been used, in order to guarantee consistent access
without byte truncation.

The patch also converts much of LLVM to use the new facility. These changes
include several probable bug fixes for truncated output, a programming error
that's no longer possible with the new interface.

llvm-svn: 211749
2014-06-26 00:00:48 +00:00
Rafael Espindola 591c641920 Merge the used symbol scanning of MCObjectStreamer and RecordStreamer.
This completes the refactoring of RecordStreamer.

llvm-svn: 211727
2014-06-25 18:37:33 +00:00