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Commit Graph

161 Commits

Author SHA1 Message Date
Venkatraman Govindaraju
2ff6b6411c Implements parsing and emitting of .cfi_window_save in MC.
llvm-svn: 191431
2013-09-26 14:49:40 +00:00
Bill Wendling
9dc412015e 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
488adf7f59 Fix comments to reflect reality.
llvm-svn: 190021
2013-09-05 00:54:52 +00:00
Bill Wendling
bd80c00b14 Use ArrayRef instead of explicit container.
llvm-svn: 190003
2013-09-04 22:35:29 +00:00
Rafael Espindola
304ef43e7d 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
Bill Wendling
49ef14ef73 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
Ulrich Weigand
2666834190 [MC/DWARF] Support .debug_frame / .debug_line code alignment factors
I've been comparing the object file output of LLVM's integrated
assembler against the external assembler on PowerPC, and one
area where differences still remain are in DWARF sections.

In particular, the GNU assembler generates .debug_frame and
.debug_line sections using a code alignment factor of 4, since
all PowerPC instructions have size 4 and must be aligned to a
multiple of 4.  However, current MC code hard-codes a code
alignment factor of 1.

This patch changes this by adding a "minimum instruction alignment"
data element to MCAsmInfo and using this as code alignment factor.

This requires passing a MCContext into MCDwarfLineAddr::Encode
and MCDwarfLineAddr::EncodeAdvanceLoc.  Note that one caller,
MCDwarfLineAddr::Write, didn't actually have that information
available.  However, it turns out that this routine is in fact
never used in the whole code base, so the patch simply removes
it.  If it turns out to be needed again at a later time, it
could be re-added with an updated interface.

llvm-svn: 183834
2013-06-12 14:46:54 +00:00
Bill Wendling
eaa4716121 Use the const_cast only where necessary.
llvm-svn: 182950
2013-05-30 18:52:57 +00:00
Rafael Espindola
237980d752 Remove the MachineMove class.
It was just a less powerful and more confusing version of
MCCFIInstruction. A side effect is that, since MCCFIInstruction uses
dwarf register numbers, calls to getDwarfRegNum are pushed out, which
should allow further simplifications.

I left the MachineModuleInfo::addFrameMove interface unchanged since
this patch was already fairly big.

llvm-svn: 181680
2013-05-13 01:16:13 +00:00
Bob Wilson
bb26b5707b Remove redundant check and use cached FrameArray values.
No functional change.

llvm-svn: 181355
2013-05-07 20:56:33 +00:00
Bill Wendling
3b4c1805ea Align the __LD,__compact_unwind section.
I know what would be cool! We should align the compact unwind section because
aligned data access is faster.
<rdar://problem/13723271>

llvm-svn: 180171
2013-04-24 03:11:14 +00:00
Bill Wendling
e8bed10789 Relax this assert. It may not hold in all cases.
llvm-svn: 179814
2013-04-18 23:16:46 +00:00
Bill Wendling
eb86a401e2 Assert if we're trying to generate a null compact unwind entry.
llvm-svn: 179809
2013-04-18 22:56:05 +00:00
Peter Collingbourne
a0d11d0e11 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
Bill Wendling
bb6240cd02 No need to have this return a bool.
llvm-svn: 179226
2013-04-10 22:03:59 +00:00
Bill Wendling
e53a442937 Track the compact unwind encoding for when we are unable to generate compact unwind information.
Compact unwind has an encoding for when we're not able to generate compact
unwind and must generate an EH frame instead. Track that, but still emit that CU
encoding.

llvm-svn: 179220
2013-04-10 21:42:06 +00:00
Manman Ren
a557c34a03 Debug Info: use SmallVector instead of std::vector in MCDwarfDirsCUMap and MCDwarfFilesCUMap
llvm-svn: 176893
2013-03-12 20:17:00 +00:00
Manman Ren
4287c8ee15 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
Eric Christopher
07f7d3a6a1 Formatting.
llvm-svn: 174664
2013-02-07 21:19:56 +00:00
Manman Ren
b9bd895a06 Dwarf: support for LTO where a single object file can have multiple line tables
We generate one line table for each compilation unit in the object file.
Reviewed by Eric and Kevin.

rdar://problem/13067005

llvm-svn: 174445
2013-02-05 21:52:47 +00:00
Eli Bendersky
36076df691 Initial patch for x32 ABI support.
Add the x32 environment kind to the triple, and separate the concept of
pointer size and callee save stack slot size, since they're not equal
on x32.

llvm-svn: 173175
2013-01-22 18:02:49 +00:00
Kevin Enderby
2e875dfb6d We want the dwarf AT_producer for assembly source files to match clang's
AT_producer.  Which includes clang's version information so we can tell
which version of the compiler was used.

This is the first of two steps to allow us to do that.  This is the llvm-mc
change to provide a method to set the AT_producer string.  The second step,
coming soon to a clang near you, will have the clang driver pass the value
of getClangFullVersion() via an flag when invoking the integrated assembler
on assembly source files.

rdar://12955296

llvm-svn: 172630
2013-01-16 17:46:23 +00:00
Eric Christopher
38c8e00aa9 These functions have default arguments of 0 for the last arg. Use
them.

llvm-svn: 171933
2013-01-09 01:57:54 +00:00
Chandler Carruth
fcc965daa6 Prepare LLVM to fix PR14625, exposing a hook in MCContext to manage the
compilation directory.

This defaults to the current working directory, just as it always has,
but now an assembler can choose to override it with a custom directory.
I've taught llvm-mc about this option and added a test case.

llvm-svn: 170371
2012-12-17 21:32:42 +00:00
Chandler Carruth
a490793037 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
81ee486113 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
6ac5a44d45 Change the representation of MCCFIInstruction.
We now store the Register and Offset directly. MachineLocation is gone (from
this file)!

llvm-svn: 168536
2012-11-24 04:33:48 +00:00
Rafael Espindola
0291ef94b9 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
edc8307796 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
a6e1d5393f 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
Alexey Samsonov
92705fb808 Emit relocations from .debug_aranges to .debug_info for asm files
llvm-svn: 167926
2012-11-14 09:55:38 +00:00
Manman Ren
fdeb41a212 Release build: guard dump functions with
"#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)"

No functional change. Update r163344.

llvm-svn: 163679
2012-09-12 05:06:18 +00:00
Manman Ren
3f0d6dd93f Release build: guard dump functions with "ifndef NDEBUG"
No functional change.

llvm-svn: 163344
2012-09-06 19:55:56 +00:00
Nick Lewycky
5178e4f814 When emitting the PC range in an FDE, use the same data encoding for both ends
of the range. Fixes PR13581!

llvm-svn: 161739
2012-08-12 08:09:45 +00:00
Jim Grosbach
dfe45ef6c5 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
Sylvestre Ledru
bf8acb65ac Fix a typo (the the => the)
llvm-svn: 160621
2012-07-23 08:51:15 +00:00
Rafael Espindola
13084dd6a3 Fix a FIXME: DwarfRequiresRelocationForSectionOffset is the same as
DwarfUsesRelocationsAcrossSections.

llvm-svn: 158992
2012-06-22 13:24:07 +00:00
Jim Grosbach
289783c78d Tidy up. Trailing whitespace.
llvm-svn: 156602
2012-05-11 01:41:30 +00:00
Benjamin Kramer
3a0f5a0df3 Compute hashes directly with hash_combine instead of taking a detour through FoldingSetNodeID.
llvm-svn: 154495
2012-04-11 14:06:39 +00:00
Rafael Espindola
646dff508a On ELF, create relocations to the abbreviation and line sections when producing
debug info for assembly files. We were already doing the right thing when
producing debug info for C/C++.

ELF linkers don't know dwarf, so they depend on these relocations to produce
valid dwarf output.

llvm-svn: 151655
2012-02-28 21:13:05 +00:00
Eric Christopher
3975f7b73a Grammar-o.
llvm-svn: 151418
2012-02-25 01:02:44 +00:00
Craig Topper
639b152ca5 Convert assert(0) to llvm_unreachable
llvm-svn: 149967
2012-02-07 05:05:23 +00:00
Rafael Espindola
9f3a003d3c Add support for .cfi_signal_frame. Fixes pr11762.
llvm-svn: 148733
2012-01-23 21:51:52 +00:00
Benjamin Kramer
320f5ae35d Add missing breaks to switch.
Found by the clang static analyzer.

llvm-svn: 148543
2012-01-20 14:42:37 +00:00
Kevin Enderby
21c229f1fb This is the matching change for the data structure name changes for the
functional change in r147860 to use DW_TAG_label's instead TAG_subprogram's.
This only changes names and updates comments.  No functional change.

llvm-svn: 147877
2012-01-10 21:12:34 +00:00
Kevin Enderby
75f4b470f9 Various crash reporting tools have a problem with the dwarf generated for
assembly source when it generates the TAG_subprogram dwarf debug info for
the labels that have nothing between them as in this bit of assembly source:

% cat ZeroLength.s 
_func1:
_func2:
 nop

One solution would be to not emit the subsequent labels with the same address
and use the next label with a different address or the end of the section for
the AT_high_pc value of the TAG_subprogram.

Turns out in llvm-mc it is not possible in all cases to determine of two
symbols have the same value at the point we put out the TAG_subprogram dwarf
debug info.

So we will have llvm-mc instead of putting out TAG_subprogram's put out
DW_TAG_label's.  And the DW_TAG_label does not have a AT_high_pc value which
avoids the problem.

This commit is only the functional change to make the diffs clear as to what is
really being changed.  The next commit will be to clean up the names of such
things like MCGenDwarfSubprogramEntry to something like MCGenDwarfLabelEntry.

rdar://10666925

llvm-svn: 147860
2012-01-10 17:52:29 +00:00
Rafael Espindola
db7319d272 Implement cfi_restore. Patch by Brian Anderson!
llvm-svn: 147356
2011-12-29 21:43:03 +00:00
Rafael Espindola
bc8c3d0ca0 Rename Remember and Restore to RememberState and RestoreState for consistency.
llvm-svn: 147354
2011-12-29 21:09:08 +00:00
Rafael Espindola
27298c6f33 Implement .cfi_escape. Patch by Brian Anderson!
llvm-svn: 147352
2011-12-29 20:24:47 +00:00
Bill Wendling
cb4ed696ef Re-re-enable compact unwind after fixing a failure in SingleSource/Benchmarks/Shootout-C++/except.cpp and friends. It was encoding the stored registers in the wrong order.
llvm-svn: 146617
2011-12-15 00:14:24 +00:00