Commit Graph

253 Commits

Author SHA1 Message Date
Rafael Espindola 0709a7bd1a Move alignment from MCSectionData to MCSection.
This starts merging MCSection and MCSectionData.

There are a few issues with the current split between MCSection and
MCSectionData.

* It optimizes the the not as important case. We want the production
of .o files to be really fast, but the split puts the information used
for .o emission in a separate data structure.

* The ELF/COFF/MachO hierarchy is not represented in MCSectionData,
leading to some ad-hoc ways to represent the various flags.

* It makes it harder to remember where each item is.

The attached patch starts merging the two by moving the alignment from
MCSectionData to MCSection.

Most of the patch is actually just dropping 'const', since
MCSectionData is mutable, but MCSection was not.

llvm-svn: 237936
2015-05-21 19:20:38 +00:00
Jim Grosbach 6f482000e9 MC: Clean up method names in MCContext.
The naming was a mish-mash of old and new style. Update to be consistent
with the new. NFC.

llvm-svn: 237594
2015-05-18 18:43:14 +00:00
Pete Cooper 81902a3ae4 Remove MCAssembler.h include from MCStreamer.h and fix users of MCStreamer.h
llvm-svn: 237483
2015-05-15 22:19:42 +00:00
Rafael Espindola 8ca44f0b5c Implement unique sections with an unique ID.
This allows the compiler/assembly programmer to switch back to a
section. This in turn fixes the bootstrap failure on powerpc (tested
on gcc110) without changing the ppc codegen at all.

I will try to cleanup the various getELFSection overloads in a  followup patch.
Just using a default argument now would lead to ambiguities.

llvm-svn: 234099
2015-04-04 18:02:01 +00:00
Rafael Espindola b61beca40c Close unique sections when switching away from them.
It is not possible to switch back to unique secitons, so close them
automatically when switching away.

llvm-svn: 233380
2015-03-27 15:01:40 +00:00
Rafael Espindola f2b408c64e Refactor how passes get a symbol at the end of a section.
There is now a canonical symbol at the end of a section that different
passes can request.

This also allows us to assert that we don't switch back to a section whose
end symbol has already been printed.

llvm-svn: 233026
2015-03-23 21:22:04 +00:00
Rafael Espindola f1a13f5ad5 Print section start labels when first switching to the section.
This is less brittle and avoids polluting the start of the file with every
debug section.

llvm-svn: 231898
2015-03-11 00:51:37 +00:00
Rafael Espindola ceb96a4cb8 Move a non-trivial virtual function out of line.
llvm-svn: 231853
2015-03-10 21:35:16 +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
Rafael Espindola 7b61ddfa6e Simplify handling of --noexecstack by using getNonexecutableStackSection.
llvm-svn: 219799
2014-10-15 16:12:52 +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
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
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 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
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
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
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
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
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
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
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
Rafael Espindola e2c6624475 Move expression visitation logic up to MCStreamer.
Remove the duplicate from MCRecordStreamer. No functionality change.

llvm-svn: 211714
2014-06-25 15:45:33 +00:00
NAKAMURA Takumi 1db5995d14 Re-apply r211399, "Generate native unwind info on Win64" with a fix to ignore SEH pseudo ops in X86 JIT emitter.
--
This patch enables LLVM to emit Win64-native unwind info rather than
DWARF CFI.  It handles all corner cases (I hope), including stack
realignment.

Because the unwind info is not flexible enough to describe stack frames
with a gap of unknown size in the middle, such as the one caused by
stack realignment, I modified register spilling code to place all spills
into the fixed frame slots, so that they can be accessed relative to the
frame pointer.

Patch by Vadim Chugunov!

Reviewed By: rnk

Differential Revision: http://reviews.llvm.org/D4081

llvm-svn: 211691
2014-06-25 12:41:52 +00:00
Rafael Espindola 6804d450cd Fix another asserting method in the null streamer.
llvm-svn: 211668
2014-06-25 05:37:58 +00:00
Rafael Espindola c00d875d35 Fix a regression from r211653.
The method was empty in the null streamer but I mistakenly replaced it with
the aborting one in MCStreamer.

llvm-svn: 211666
2014-06-25 05:31:22 +00:00
Rafael Espindola 624ac24da9 Move some trivial methods up to MCStreamer.
This saves some duplicated boilerplate in RecordStreamer and NullStreamer.

llvm-svn: 211653
2014-06-25 00:27:53 +00:00
Rafael Espindola 49bbfd026a Simplify the handling of .cfi_endproc.
No functionality change.

llvm-svn: 211651
2014-06-25 00:13:59 +00:00
Rafael Espindola f491704e22 Print a=b as an assignment.
In assembly the expression a=b is parsed as an assignment, so it should be
printed as one.

This remove a truly horrible hack for producing a label with "a=.". It would
be used by codegen but would never be reached by the asm parser. Sorry I
missed this when it was first committed.

llvm-svn: 211639
2014-06-24 22:45:16 +00:00
Rafael Espindola 886048276f Allow using .cfi_startproc without a leading symbol.
This is possible now that we don't produce .eh symbols. This fixes pr19430.

llvm-svn: 211502
2014-06-23 15:34:32 +00:00
NAKAMURA Takumi d77cefe633 Revert r211399, "Generate native unwind info on Win64"
It broke Legacy JIT Tests on x86_64-{mingw32|msvc}, aka Windows x64.

llvm-svn: 211480
2014-06-22 22:00:56 +00:00
Reid Kleckner 4a01230db4 Generate native unwind info on Win64
This patch enables LLVM to emit Win64-native unwind info rather than
DWARF CFI.  It handles all corner cases (I hope), including stack
realignment.

Because the unwind info is not flexible enough to describe stack frames
with a gap of unknown size in the middle, such as the one caused by
stack realignment, I modified register spilling code to place all spills
into the fixed frame slots, so that they can be accessed relative to the
frame pointer.

Patch by Vadim Chugunov!

Reviewed By: rnk

Differential Revision: http://reviews.llvm.org/D4081

llvm-svn: 211399
2014-06-20 20:35:47 +00:00
Rafael Espindola 3dd8ef6b49 Move EH/Debug frame handling to the object streamer.
Now that the asm streamer doesn't use it, the MCStreamer doesn't need to know
about it.

llvm-svn: 208562
2014-05-12 14:02:44 +00:00
Rafael Espindola 8285b778f4 Remove always true argument.
llvm-svn: 208558
2014-05-12 13:34:25 +00:00
Rafael Espindola 7f4ccced49 Remove an always true argument.
llvm-svn: 208557
2014-05-12 13:30:10 +00:00
Rafael Espindola aa0242723e Make getOrCreateSymbolData non virtual.
llvm-svn: 207367
2014-04-27 17:23:37 +00:00
Kevin Enderby 96918bc406 Fix the assembler to print a better relocatable expression error
diagnostic that includes location information.

Currently if one has this assembly:

	.quad (0x1234 + (4 * SOME_VALUE))

where SOME_VALUE is undefined ones gets the less than
useful error message with no location information:

% clang -c x.s
clang -cc1as: fatal error: error in backend: expected relocatable expression

With this fix one now gets a more useful error message
with location information:

% clang -c x.s 
x.s:5:8: error: expected relocatable expression
 .quad (0x1234 + (4 * SOME_VALUE))
       ^

To do this I plumbed the SMLoc through the MCObjectStreamer
EmitValue() and EmitValueImpl() interfaces so it could be used
when creating the MCFixup.

rdar://12391022

llvm-svn: 206906
2014-04-22 17:27:29 +00:00
Quentin Colombet 97c05b52b4 [MC] Emit an error if cfi_startproc is used before a symbol is defined.
Currently, we bind those directives with the last symbol, so if none
has been defined, this would lead to a crash of the compiler.

<rdar://problem/15939159>

llvm-svn: 206236
2014-04-15 01:17:45 +00:00
Craig Topper bb694de649 [C++11] More 'nullptr' conversion or in some cases just using a boolean check instead of comparing to nullptr.
llvm-svn: 206129
2014-04-13 04:57:38 +00:00
David Blaikie 3464161070 DebugInfo: Avoid creating unnecessary/empty line tables and remove the special case of '0' in DwarfCompileUnit::initStmtList by just always using a label difference
This moves one case of raw text checking down into the MCStreamer
interfaces in the form of a virtual function, even if we ultimately end
up consolidating on the one-or-many line tables issue one day, this is
nicer in the interim. This just generally streamlines a bunch of use
cases into a common code path.

llvm-svn: 205287
2014-04-01 08:07:52 +00:00
Rafael Espindola 98629c4e4d Don't use EmitAbsValue with symbol references.
The function exists to force an expression to be absolute, but there it is not
possible to force a symbol reference since

a = b
.long a

means something else.

This is an alternative fix for pr9951 that uses an assert. It then deletes
the old pr9951 test that was testing nothing already.

llvm-svn: 204399
2014-03-20 21:26:38 +00:00
Zoran Jovanovic 28221d8bc1 Mark alias symbols as microMIPS if necessary. Differential Revision: http://llvm-reviews.chandlerc.com/D3080
llvm-svn: 204323
2014-03-20 09:44:49 +00:00
David Blaikie c714ef4581 DebugInfo: Improve reuse of file table entries in asm debug info
The previous deduping strategy was woefully inadequate - it only
considered the most recent file used and avoided emitting a duplicate in
that case - never considering the a/b/a scenario.

It was also lacking when it came to directory paths as the previous
filename would never match the current if the filename had been split
into file and directory components.

This change builds caching functionality into the line table at the
lowest level in an optional form (a file number of 0 indicates that one
should be chosen and returned) and will eventually be reused by the
normal source level debugging DWARF emission.

llvm-svn: 204027
2014-03-17 01:52:11 +00:00
Rafael Espindola 8377085657 Always print the implicit .text at the start of an asm file.
Before llvm-mc would print it, but llc was assuming that it would produce
another section changing directive before one was needed. That assumption is
false with inline asm.

Fixes PR19049.

Another option would be to always create the section, but in the asm printer
avoid printing sections changes during initialization. That would work, but
* We do use the fact that llvm-mc prints it in testing. The tests can be changed
  if needed.
* A quick poll on IRC suggest that most developers prefer the implicit .text to
  be printed.

llvm-svn: 203001
2014-03-05 20:09:15 +00:00
Rafael Espindola 5054362920 Always create a temporary symbol to use with the cfi frame.
This is a small simplification and a small step in fixing pr18743 since
private functions on MachO should be using a 'l' prefix.

llvm-svn: 200994
2014-02-07 21:23:18 +00:00
Rafael Espindola 972e71ab5a Remove another hasRawTextSupport.
To remove this one simply move the end of file logic from the asm printer to
the target mc streamer.

This removes the last call to hasRawTextSupport from lib/Target.

llvm-svn: 200590
2014-01-31 23:10:26 +00:00
David Majnemer e035cf9ce4 MC: Add support for .cfi_startproc simple
This commit allows LLVM MC to process .cfi_startproc directives when
they are followed by an additional `simple' identifier. This signals to
elide the emission of target specific CFI instructions that would
normally occur initially.

This fixes PR16587.

Differential Revision: http://llvm-reviews.chandlerc.com/D2624

llvm-svn: 200227
2014-01-27 17:20:25 +00:00
Rafael Espindola 24ea09ef7d Construct the MCStreamer before constructing the MCTargetStreamer.
This has a few advantages:
* Only targets that use a MCTargetStreamer have to worry about it.
* There is never a MCTargetStreamer without a MCStreamer, so we can use a
  reference.
* A MCTargetStreamer can talk to the MCStreamer in its constructor.

llvm-svn: 200129
2014-01-26 06:06:37 +00:00
Rafael Espindola 0e2ccb2df1 Simplify the logic for deciding when to initialize the sections.
llvm-svn: 199971
2014-01-24 03:54:40 +00:00
Rafael Espindola 61adb27de4 Most streamers' InitSections just create a text section. Make that the default
llvm-svn: 199969
2014-01-24 02:42:26 +00:00
Greg Fitzgerald 1f6a6086ae Fix inline assembly that switches between ARM and Thumb modes
This patch restores the ARM mode if the user's inline assembly
does not.  In the object streamer, it ensures that instructions
following the inline assembly are encoded correctly and that
correct mapping symbols are emitted.  For the asm streamer, it
emits a .arm or .thumb directive.

This patch does not ensure that the inline assembly contains
the ADR instruction to switch modes at runtime.

The problem we need to solve is code like this:

  int foo(int a, int b) {
    int r = a + b;
    asm volatile(
        ".align 2     \n"
        ".arm         \n"
        "add r0,r0,r0 \n"
    : : "r"(r));
    return r+1;
  }

If we compile this function in thumb mode then the inline assembly
will switch to arm mode. We need to make sure that we switch back to
thumb mode after emitting the inline assembly or we will incorrectly
encode the instructions that follow (i.e. the assembly instructions
for return r+1).

Based on patch by David Peixotto

Change-Id: Ib57f6d2d78a22afad5de8693fba6230ff56ba48b
llvm-svn: 199818
2014-01-22 18:32:35 +00:00
Rafael Espindola 0b694814a8 Add an emitRawComment function and use it to simplify some uses of EmitRawText.
llvm-svn: 199397
2014-01-16 16:28:37 +00:00
Rafael Espindola 6d5f7ce348 Replace .mips_hack_stocg with ".set micromips" and ".set nomicromips".
This matches what gnu as does and implementing this is easier than arguing
about it.

llvm-svn: 199181
2014-01-14 04:25:13 +00:00
Timur Iskhodzhanov c1fb2d6111 [COFF] Add support for the .secidx directive
Reviewed at http://llvm-reviews.chandlerc.com/D2445

llvm-svn: 197826
2013-12-20 18:15:00 +00:00
Juergen Ributzka d12ccbd343 [weak vtables] Remove a bunch of weak vtables
This patch removes most of the trivial cases of weak vtables by pinning them to
a single object file. The memory leaks in this version have been fixed. Thanks
Alexey for pointing them out.

Differential Revision: http://llvm-reviews.chandlerc.com/D2068

Reviewed by Andy

llvm-svn: 195064
2013-11-19 00:57:56 +00:00
Alexey Samsonov 49109a279c Revert r194865 and r194874.
This change is incorrect. If you delete virtual destructor of both a base class
and a subclass, then the following code:
  Base *foo = new Child();
  delete foo;
will not cause the destructor for members of Child class. As a result, I observe
plently of memory leaks. Notable examples I investigated are:
ObjectBuffer and ObjectBufferStream, AttributeImpl and StringSAttributeImpl.

llvm-svn: 194997
2013-11-18 09:31:53 +00:00
Juergen Ributzka dbedae89b9 [weak vtables] Remove a bunch of weak vtables
This patch removes most of the trivial cases of weak vtables by pinning them to
a single object file.

Differential Revision: http://llvm-reviews.chandlerc.com/D2068

Reviewed by Andy

llvm-svn: 194865
2013-11-15 22:34:48 +00:00
David Blaikie d8c5b4e8ef MCStreamer: Reimplement the virtual EmitRawText as a protected member, EmitRawTextImpl, to avoid string literal ambiguities
Also improve the implementation of EmitRawText(Twine) so it doesn't
bother using the SmallString buffer if the Twine is a simple StringRef
anyway.

llvm-svn: 193378
2013-10-24 22:43:10 +00:00
Rafael Espindola a17151ad5a Add a MCTargetStreamer interface.
This patch fixes an old FIXME by creating a MCTargetStreamer interface
and moving the target specific functions for ARM, Mips and PPC to it.

The ARM streamer is still declared in a common place because it is
used from lib/CodeGen/ARMException.cpp, but the Mips and PPC are
completely hidden in the corresponding Target directories.

I will send an email to llvmdev with instructions on how to use this.

llvm-svn: 192181
2013-10-08 13:08:17 +00:00
Rafael Espindola ac4ad25a00 Remove some really nasty uses of hasRawTextSupport.
When MC was first added, targets could use hasRawTextSupport to keep features
working before they were added to the MC interface.

The design goal of MC is to provide an uniform api for printing assembly and
object files. Short of relaxations and other corner cases, a object file is
just another representation of the assembly.

It was never the intention that targets would keep doing things like

if (hasRawTextSupport())
  Set flags in one way.
else
  Set flags in another way.

When they do that they create two code paths and the object file is no longer
just another representation of the assembly. This also then requires testing
with llc -filetype=obj, which is extremelly brittle.

This patch removes some of these hacks by replacing them with smaller ones.
The ARM flag setting is trivial, so I just moved it to the constructor. For
Mips, the patch adds two temporary hack directives that allow the assembly
to represent the same things as the object file was already able to.

The hope is that the mips developers will replace the hack directives with
the same ones that gas uses and drop the -print-hack-directives flag.

I will also try to implement a target streamer interface, so that we can
move this out of the common code.

In summary, for any new work, two rules of the thumb are
  * Don't use "llc -filetype=obj" in tests.
  * Don't add calls to hasRawTextSupport.

llvm-svn: 192035
2013-10-05 16:42:21 +00:00
Venkatraman Govindaraju 3816d43a9a Implements parsing and emitting of .cfi_window_save in MC.
llvm-svn: 191431
2013-09-26 14:49:40 +00:00
Richard Mitton 21101b3231 Added support for generate DWARF .debug_aranges sections automatically.
llvm-svn: 191052
2013-09-19 23:21:01 +00:00
Bill Wendling 544d1613fb Set the encoding to '0' if we don't have an MAB.
llvm-svn: 190354
2013-09-09 21:22:44 +00:00
Bill Wendling 550c76dbd6 Call generateCompactUnwindEncodings() right before we need to output the frame information.
There are more than one paths to where the frame information is emitted. Place
the call to generateCompactUnwindEncodings() into the method which outputs the
frame information, thus ensuring that the encoding is there for every path. This
involved threading the MCAsmBackend object through to this method.

<rdar://problem/13623355>

llvm-svn: 190335
2013-09-09 19:48:37 +00:00
Bill Wendling 58e2d3d856 Generate compact unwind encoding from CFI directives.
We used to generate the compact unwind encoding from the machine
instructions. However, this had the problem that if the user used `-save-temps'
or compiled their hand-written `.s' file (with CFI directives), we wouldn't
generate the compact unwind encoding.

Move the algorithm that generates the compact unwind encoding into the
MCAsmBackend. This way we can generate the encoding whether the code is from a
`.ll' or `.s' file.

<rdar://problem/13623355>

llvm-svn: 190290
2013-09-09 02:37:14 +00:00
Kai Nacke 1b7e4866f4 Fix wrong code offset for unwind code SET_FPREG.
The code offset for unwind code SET_FPREG is wrong because it is set
to constant 0. The fix is to do the same as for the other unwind
codes: emit a label and later the absolute difference between the
label and the begin of the prologue.
Also enables the failing test case MC/COFF/seh.s

Reviewed by Jim Grosbach, Charles Davis and Nico Rieck.

llvm-svn: 189309
2013-08-27 04:16:16 +00:00
Kai Nacke c5cca5ab42 Revert: Fix wrong code offset for unwind code SET_FPREG.
llvm-svn: 185793
2013-07-08 04:48:34 +00:00
Kai Nacke 66bfdb8354 Fix wrong code offset for unwind code SET_FPREG.
The code offset for unwind code SET_FPREG is wrong because it is set
to constant 0. The fix is to do the same as for the other unwind
codes: emit a label and later the absolute difference between the
label and the begin of the prologue.
Also enables the failing test case MC/COFF/seh.s

Reviewed by Charles Davis and Nico Rieck.

llvm-svn: 185758
2013-07-06 17:15:36 +00:00
Rafael Espindola 64e1af8eb9 Remove address spaces from MC.
This is dead code since PIC16 was removed in 2010. The result was an odd mix,
where some parts would carefully pass it along and others would assert it was
zero (most of the object streamer for example).

llvm-svn: 185436
2013-07-02 15:49:13 +00:00
Serge Pavlov 24a3ebb78d Use MCFillFragment for zero-initialized data.
It fixes PR16338 (ICE when compiling very large two-dimensional array).

Differential Revision: http://llvm-reviews.chandlerc.com/D1043

llvm-svn: 185080
2013-06-27 14:35:03 +00:00
Bill Wendling bc07a8900c Use pointers to the MCAsmInfo and MCRegInfo.
Someone may want to do something crazy, like replace these objects if they
change or something.

No functionality change intended.

llvm-svn: 184175
2013-06-18 07:20:20 +00:00
Charles Davis 17a0dcb91c MCStreamer: Also clear vector of W64UnwindInfos on reset().
Patch by Kai Nacke!

llvm-svn: 181363
2013-05-07 21:14:15 +00:00
Peter Collingbourne 2f495b93ee Add support for subsections to the ELF assembler. Fixes PR8717.
Differential Revision: http://llvm-reviews.chandlerc.com/D598

llvm-svn: 179725
2013-04-17 21:18:16 +00:00
Jakub Staszak a0f3694aa5 Change NULL to 0.
llvm-svn: 177342
2013-03-18 23:08:01 +00:00
Manman Ren 1e4272085d Debug Info: store the files and directories for each compile unit.
We now emit a line table for each compile unit. To reduce the prologue size
of each line table, the files and directories used by each compile unit are
stored in std::map<unsigned, std::vector< > > instead of std::vector< >.

The prologue for a lto'ed image can be as big as 93K. Duplicating 93K for each
compile unit causes a huge increase of debug info. With this patch, each
prologue will only emit the files required by the compile unit.

rdar://problem/13342023

llvm-svn: 176605
2013-03-07 01:42:00 +00:00
Jack Carter 2f8d9d913c ELF symbol table field st_other support,
excluding visibility bits.

Generic STO handling at the Target level.

The st_other field of the ELF symbol table is one
byte in size. The first 2 bytes are used for generic
visibility and are currently handled by llvm.

The other six bits are processor specific and need 
to be set at the target level.

A couple of notes:

The new static methods for accessing and setting the "other"
flags in include/llvm/MC/MCELF.h match the style guide
and not the other methods in the file. I don't like the
inconsistency, but feel I should follow the prescribed 
lowerUpper() convention.

STO_ value definitions are not specified in gnu land as 
consistently as the STT_ and STB_ fields. Probably because
the latter were defined in a standards doc and the former
defined partially in code. I have stuck with the full byte
definition of the flags.

Contributer: Zoran Jovanovic
llvm-svn: 175561
2013-02-19 21:57:35 +00:00
Jack Carter f6622bad6b This patch just fixes up various llvm formatting
violations such as tabs, blanks at eol and long 
lines.


 

llvm-svn: 175007
2013-02-12 21:29:39 +00:00
Chandler Carruth de093ef8d6 Give the MCStreamer class hierarchy LLVM RTTI facilities for use with
isa<> and dyn_cast<>. In several places, code is already hacking around
the absence of this, and there seem to be several interfaces that might
be lifted and/or devirtualized using this.

This change was based on a discussion with Jim Grosbach about how best
to handle testing for specific MCStreamer subclasses. He said that this
was the correct end state, and everything else was too hacky so
I decided to just make it so.

No functionality should be changed here, this is just threading the kind
through all the constructors and setting up the classof overloads.

llvm-svn: 174113
2013-01-31 23:29:57 +00:00
Eric Christopher bf7bc4966c Last in the series of removing unnecessary '0' arguments for
address space. Reordered the EmitULEB128IntValue arguments to
make this easier.

llvm-svn: 171949
2013-01-09 03:52:05 +00:00
Pedro Artigas 3383225167 small fixes to enable the reuse of the pass manager across multiple modules
llvm-svn: 171475
2013-01-04 18:04:42 +00:00
Reed Kotler aee4d5d194 This patch is needed to make c++ exceptions work for mips16.
Mips16 is really a processor decoding mode (ala thumb 1) and in the same
program, mips16 and mips32 functions can exist and can call each other.

If a jal type instruction encounters an address with the lower bit set, then
the processor switches to mips16 mode (if it is not already in it). If the
lower bit is not set, then it switches to mips32 mode.

The linker knows which functions are mips16 and which are mips32.
When relocation is performed on code labels, this lower order bit is
set if the code label is a mips16 code label.

In general this works just fine, however when creating exception handling
tables and dwarf, there are cases where you don't want this lower order
bit added in.

This has been traditionally distinguished in gas assembly source by using a
different syntax for the label.

lab1:      ; this will cause the lower order bit to be added
lab2=.     ; this will not cause the lower order bit to be added

In some cases, it does not matter because in dwarf and debug tables
the difference of two labels is used and in that case the lower order
bits subtract each other out.

To fix this, I have added to mcstreamer the notion of a debuglabel.
The default is for label and debug label to be the same. So calling
EmitLabel and EmitDebugLabel produce the same result.

For various reasons, there is only one set of labels that needs to be
modified for the mips exceptions to work. These are the "$eh_func_beginXXX" 
labels.

Mips overrides the debug label suffix from ":" to "=." .

This initial patch fixes exceptions. More changes most likely
will be needed to DwarfCFException to make all of this work
for actual debugging. These changes will be to emit debug labels in some
places where a simple label is emitted now.

Some historical discussion on this from gcc can be found at:
http://gcc.gnu.org/ml/gcc-patches/2008-08/msg00623.html
http://gcc.gnu.org/ml/gcc-patches/2008-11/msg01273.html 

llvm-svn: 170279
2012-12-16 04:00:45 +00:00
Pedro Artigas 7212ee4534 Make the MCStreamer have a reset method and call that after finalization of the asm printer,
also changed MCContext to a single reset only method for simplicity as requested on the list

llvm-svn: 170041
2012-12-12 22:59:46 +00:00
Lang Hames 517fc8b264 Defer call to InitSections until after MCContext has been initialized. If
InitSections is called before the MCContext is initialized it could cause
duplicate temporary symbols to be emitted later (after context initialization
resets the temporary label counter).

llvm-svn: 169785
2012-12-10 22:49:11 +00:00
Chandler Carruth ed0881b2a6 Use the new script to sort the includes of every file under lib.
Sooooo many of these had incorrect or strange main module includes.
I have manually inspected all of these, and fixed the main module
include to be the nearest plausible thing I could find. If you own or
care about any of these source files, I encourage you to take some time
and check that these edits were sensible. I can't have broken anything
(I strictly added headers, and reordered them, never removed), but they
may not be the headers you'd really like to identify as containing the
API being implemented.

Many forward declarations and missing includes were added to a header
files to allow them to parse cleanly when included first. The main
module rule does in fact have its merits. =]

llvm-svn: 169131
2012-12-03 16:50:05 +00:00
Rafael Espindola cdb9a538d6 Add support for .cfi_register now that it is easy to extent the representation
to support it. Original patch with the parsing and plumbing by the PaX team and
Roman Divacky. I added the bits in MCDwarf.cpp and the test.

llvm-svn: 168565
2012-11-25 15:14:49 +00:00
Rafael Espindola 5dce65b21e Give each MCCFIInstruction its own opcode.
This untangles the switch cases of the old Move and RelMove opcodes a bit
and makes it clear how to add new instructions.

llvm-svn: 168534
2012-11-24 03:10:54 +00:00
Rafael Espindola 7a6e441262 Move a bit of duplicated code into a helper function.
llvm-svn: 168533
2012-11-24 02:18:49 +00:00
Rafael Espindola 1c3086cc91 Refactor how MCCFIInstructions are created.
Give MCCFIInstruction a single, private constructor and add helper static
methods that create each type of cfi instruction. This is is preparation
for changing its representation. The representation with a pair
MachineLocations older than MC and has been abused quiet a bit to support
more cfi instructions.

llvm-svn: 168532
2012-11-24 02:01:08 +00:00
Rafael Espindola 9bb247813a Implement .cfi_undefined. Based on a patch from PaX team, updated by
Roman Divacky. I just added the testcase.

llvm-svn: 168520
2012-11-23 16:59:41 +00:00
Adhemerval Zanella ef206f19a4 PowerPC: add EmitTCEntry class for TOC creation
This patch replaces the EmitRawText by a EmitTCEntry class (specialized for
each Streamer) in PowerPC64 TOC entry creation.

llvm-svn: 165940
2012-10-15 15:43:14 +00:00
Jim Grosbach bf387df302 Move [SU]LEB128 encoding to a utility header.
These functions are very generic. There's no reason for them to
be tied to MCObjectWriter.

llvm-svn: 161545
2012-08-08 23:56:06 +00:00
Jim Grosbach 4b63d2ae1d Refactor data-in-code annotations.
Use a dedicated MachO load command to annotate data-in-code regions.
This is the same format the linker produces for final executable images,
allowing consistency of representation and use of introspection tools
for both object and executable files.

Data-in-code regions are annotated via ".data_region"/".end_data_region"
directive pairs, with an optional region type.

data_region_directive := ".data_region" { region_type }
region_type := "jt8" | "jt16" | "jt32" | "jta32"
end_data_region_directive := ".end_data_region"

The previous handling of ARM-style "$d.*" labels was broken and has
been removed. Specifically, it didn't handle ARM vs. Thumb mode when
marking the end of the section.

rdar://11459456

llvm-svn: 157062
2012-05-18 19:12:01 +00:00