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260 Commits

Author SHA1 Message Date
Kevin Enderby
63cf89d532 The second part of support for generating dwarf for assembly source files. This 
generates the dwarf Compile Unit DIE and a dwarf subprogram DIE for each
non-temporary label.

The next part will be to get the clang driver to enable this when assembling
a .s file.  rdar://9275556

llvm-svn: 146262
 2011-12-09 18:09:40 +00:00
Bill Wendling
a4163dadb8 Re-enable compact unwind. It seems to work now. <rdar://problem/10441838> 
llvm-svn: 145977
 2011-12-06 22:18:12 +00:00
Bob Wilson
f76590b3c5 Disable generation of compact unwind encodings. <rdar://problem/10441578> 
This still seems to be causing some failures.  It needs more testing before
it gets enabled again.

llvm-svn: 144543
 2011-11-14 18:21:07 +00:00
Bob Wilson
c6ab8ce742 Remove FIXME comment that should have been removed with r144351. 
llvm-svn: 144392
 2011-11-11 17:34:14 +00:00
Bill Wendling
b26a165225 Reenable compact unwinding now that <rdar://problem/10430076> is fixed. 
llvm-svn: 144351
 2011-11-11 01:03:50 +00:00
Bill Wendling
7f1e8b3b0e Disable compact unwind generation until I can solve the codegen problems. 
llvm-svn: 144346
 2011-11-11 00:28:42 +00:00
Benjamin Kramer
1eb240810e Simplify code. No functionality change. 
llvm-svn: 144186
 2011-11-09 13:19:15 +00:00
Bill Wendling
3b4008b8e4 Emit the compact unwind *if* we have a compact unwind encoding. 
*headdesk*

llvm-svn: 144138
 2011-11-08 22:23:43 +00:00
Benjamin Kramer
89ebc7ab4b Simplify some uses of utohexstr. 
As a side effect hex is printed lowercase instead of uppercase now.

llvm-svn: 144013
 2011-11-07 21:00:59 +00:00
Bill Wendling
32608b1900 As a first step, emit both the compact unwind and CIE/FDEs for a function. 
llvm-svn: 139152
 2011-09-06 18:37:11 +00:00
Evan Cheng
7bfc442b2d Some autoconf tests use module level inline asm to test compiler's handling of 
.cfi_startproc. e.g. libffi:

 $ cat confopt.c 
asm (".cfi_startproc\n\t.cfi_endproc");

int main () { return 0; }

Teach MC / dwarf emission to handle these cfi directives which essentially
create an empty frame.

rdar://10017184

llvm-svn: 138504
 2011-08-24 22:31:37 +00:00
Bill Wendling
d319d42aea Emit the __compact_unwind section first. If there are any frames which weren't 
emitted, emit them next as CIE/FDEs.

llvm-svn: 135807
 2011-07-22 21:18:59 +00:00
Evan Cheng
c9bc5a9011 Goodbye TargetAsmInfo. This eliminate last bit of CodeGen and Target in llvm-mc. 
There is still a bit more refactoring left to do in Targets. But we are now very
close to fixing all the layering issues in MC.

llvm-svn: 135611
 2011-07-20 19:50:42 +00:00
Evan Cheng
380dc98371 Add MCObjectFileInfo and sink the MCSections initialization code from 
TargetLoweringObjectFileImpl down to MCObjectFileInfo.

TargetAsmInfo is done to one last method. It's *almost* gone!

llvm-svn: 135569
 2011-07-20 05:58:47 +00:00
Bill Wendling
cd5cb5b44e Micro-opt: Only emit compact unwind if there is a compact unwind encoding to emit. 
llvm-svn: 135452
 2011-07-19 00:09:25 +00:00
Bill Wendling
8dd021da20 Use the CompactUnwindEncoding from the Frame, if it's defined. 
llvm-svn: 135451
 2011-07-19 00:06:12 +00:00
Evan Cheng
10c6820ff4 Move getInitialFrameState from TargetFrameInfo to MCAsmInfo (suggestions for 
better location welcome).

llvm-svn: 135438
 2011-07-18 22:29:13 +00:00
Evan Cheng
561d71ce7b Sink getDwarfRegNum, getLLVMRegNum, getSEHRegNum from TargetRegisterInfo down 
to MCRegisterInfo. Also initialize the mapping at construction time.

This patch eliminate TargetRegisterInfo from TargetAsmInfo. It's another step
towards fixing the layering violation.

llvm-svn: 135424
 2011-07-18 20:57:22 +00:00
Evan Cheng
1ae06d95e0 Move some parts of TargetAsmInfo down to MCAsmInfo. This is not the greatest 
solution but it is a small step towards removing the horror that is
TargetAsmInfo.

llvm-svn: 135237
 2011-07-15 02:09:41 +00:00
Bill Wendling
953f7ddcc2 Remove setting the bit for personality function. It should be set by the linker. 
llvm-svn: 135236
 2011-07-15 01:42:32 +00:00
Bill Wendling
6d36444dc5 Encode that we have a personality function. 
llvm-svn: 135227
 2011-07-15 00:07:31 +00:00
Bill Wendling
fb25bf95c9 * If we have an LSDA, we need to mark it in the encoding. 
* The personality function should be encoded as an absolute pointer to the function.

llvm-svn: 135215
 2011-07-14 23:34:45 +00:00
Evan Cheng
3d2be55d6c Unfortunately several files in MC are badly violating layering rule by using 
TargetAsmInfo, which in turn pulls in TargetRegisterInfo, etc. :-( There are
other cases of violations, but this is probably the worst.

This patch is but one small step towards fixing this. 500 more steps to go. :-(

llvm-svn: 135131
 2011-07-14 05:43:07 +00:00
Bill Wendling
e6de1eeb86 Don't emit the FDE end label if the last thing emitted was a compact unwind and 
not the FDE

llvm-svn: 135020
 2011-07-13 00:49:09 +00:00
Bill Wendling
ba39846c2b Add a target hook to encode the compact unwind information. 
llvm-svn: 134577
 2011-07-07 00:54:13 +00:00
Bill Wendling
fd3f4e7040 Clean up the #includes. 
llvm-svn: 134557
 2011-07-06 22:52:32 +00:00
Bill Wendling
770794cc60 Remove tabs. 
llvm-svn: 134212
 2011-06-30 23:59:38 +00:00
Bill Wendling
995ebcfd4c Improve comment: Show the register the DWARF label is added to. 
llvm-svn: 134209
 2011-06-30 23:47:40 +00:00
Bill Wendling
80c39ac9a5 Add one more comment to the FDE verbose asm output. 
llvm-svn: 134200
 2011-06-30 22:35:49 +00:00
Bill Wendling
834cb876e6 Add comments to the FDE. 
llvm-svn: 134196
 2011-06-30 22:02:20 +00:00
Bill Wendling
eace9970bd Add more comments to the ASM output for the CIE's "moves". 
llvm-svn: 134194
 2011-06-30 21:45:12 +00:00
Bill Wendling
7a94c43c7a Add comments to the ASM output to help understand the compact unwind and CIE tables. 
llvm-svn: 134191
 2011-06-30 21:25:51 +00:00
Bill Wendling
3080b09d31 * Use the proper size to output the range size. 
* Rough in the compact encoding part.

llvm-svn: 134119
 2011-06-30 00:30:52 +00:00
Bill Wendling
5a7a3562e0 Stupid error: If the LSDA and Personality functions aren't there, emit 0 instead 
of the encoding.

llvm-svn: 134117
 2011-06-29 23:53:16 +00:00
Bill Wendling
d394aea75e We don't want to use relocations inside the compact unwind section. Just use the 
symbols instead.

llvm-svn: 134115
 2011-06-29 23:49:12 +00:00
Bill Wendling
4d12748388 Use a reference. Don't make a useless copy of the vector. 
llvm-svn: 133707
 2011-06-23 07:55:41 +00:00
Bill Wendling
e7fc1a8d9e Formatting changes. No functionality change. 
llvm-svn: 133706
 2011-06-23 07:44:54 +00:00
Bill Wendling
42866c8944 Use the presence of the __compact_unwind section to indicate that a target 
supports compact unwind info instead of having a separate flag indicating this.

llvm-svn: 133685
 2011-06-23 05:13:28 +00:00
Bill Wendling
538dc8cc6f Some skeleton code to emit the compact unwind. If the information is unable to 
be emitted in a compact way, we then default to emitting a CIE and FDE.

llvm-svn: 133676
 2011-06-23 01:06:23 +00:00
Benjamin Kramer
1525b80eef Directly print to a raw_ostream instead of printing to a buffer first. 
llvm-svn: 133352
 2011-06-18 14:42:47 +00:00
Jim Grosbach
909aff492f No reason not to allow defining the CFA as a reg w/ offset zero. 
llvm-svn: 131760
 2011-05-20 21:50:09 +00:00
Rafael Espindola
ce84130f0f Avoid a gcc warning. 
llvm-svn: 131161
 2011-05-10 22:28:35 +00:00
Rafael Espindola
e8890f4b16 On MachO, unlike ELF, there should be no relocation to produce the CIE pointer. 
llvm-svn: 131149
 2011-05-10 20:59:42 +00:00
Rafael Espindola
ec3d43391f The EH symbols are only needed in eh_frame, not debug_frame. 
llvm-svn: 131146
 2011-05-10 19:51:53 +00:00
Rafael Espindola
ff4443c82c In a debug_frame the cfi offset is to the start of the debug_frame section! 
llvm-svn: 131129
 2011-05-10 15:20:23 +00:00
Rafael Espindola
b7c942431f Add support for producing .deubg_frame sections. 
llvm-svn: 131121
 2011-05-10 03:54:12 +00:00
Rafael Espindola
566d48be51 Small cleanups. 
llvm-svn: 131120
 2011-05-10 03:26:21 +00:00
Rafael Espindola
dce419e62b Remove unused argument. 
llvm-svn: 131118
 2011-05-10 03:01:39 +00:00
NAKAMURA Takumi
b8bfce2165 Eliminate an unused line to fix a warning. 
llvm-svn: 131078
 2011-05-08 23:19:04 +00:00
Rafael Espindola
0baeced1f4 Don't force relaxation of AdvanceLoc instructions on OS X. gdb is happy with 
the smaller encoding and this cuts 270336 bytes from a release version of
clang and 1246272 bytes from a debug build.

llvm-svn: 131067
 2011-05-08 14:35:21 +00:00
Rafael Espindola
003a45810d Switch Darwin to the generic CIE/FDE printer. 
llvm-svn: 131031
 2011-05-06 22:29:04 +00:00
Daniel Dunbar
3cd9c46c3a MCDwarf: Don't save Twine to local variable, this is almost never safe to do 
(and should thus never be done).
 - Should fix a crash on win32.

llvm-svn: 130793
 2011-05-03 21:33:37 +00:00
Rafael Espindola
eb5d0cb4f4 GCC uses a different encoding of pointers in the FDE when using 
-fno-dwarf2-cfi-asm. Implement the same behavior.

llvm-svn: 130637
 2011-05-01 04:49:54 +00:00
Rafael Espindola
2f2c3bf31f Simplify the handling of pcrel relocations on ELF. Now we do the right thing 
for all symbol differences and can drop the old EmitPCRelSymbolValue
method.

This also make getExprForFDESymbol on ELF equal to the one on MachO, and it
can be made non-virtual.

llvm-svn: 130634
 2011-05-01 03:50:49 +00:00
Rafael Espindola
13b74fd203 Avoid some uses of .uleb128. This is a small speedup and more importantly 
lets this code be used when producing assembly code for old assemblers without
uleb support.

llvm-svn: 130544
 2011-04-29 21:50:57 +00:00
Rafael Espindola
6c6e1622a8 Last bit by bit compatibility patch to MCDwarf.cpp: If a FDE with no LSDA is 
assigned to a CIE that requires one, just output a 0.

llvm-svn: 130472
 2011-04-29 03:06:29 +00:00
Rafael Espindola
a664fdf4cd Add an alternative implementation of CIE and FDE emission that outputs them 
in the same order as the one in CodeGen.

llvm-svn: 130471
 2011-04-29 02:42:28 +00:00
Rafael Espindola
be5cb08cf8 Add the getExprForFDESymbol method that responsible for computing the 
expressions used in the FDE to refer to symbols.

llvm-svn: 130437
 2011-04-28 21:04:39 +00:00
Rafael Espindola
f75a67d261 Add a getExprForPersonalitySymbol method to MCAsmInfo. Use it when 
converting the symbol passed to .cfi_personality into bytes is the file.

llvm-svn: 130400
 2011-04-28 16:09:09 +00:00
Rafael Espindola
4f9a76ab0b Mark the EH symbol global or weak if the corresponding function is. 
llvm-svn: 130397
 2011-04-28 12:50:37 +00:00
Rafael Espindola
7bc992c8d3 Add a small temporary hack for producing identical eh_frame sections on OS X. 
This removes one of the main advantages of moving eh_frame to MC, but
makes the transition a lot easier to debug (run md5).

llvm-svn: 130379
 2011-04-28 04:04:14 +00:00
Rafael Espindola
d63b896d05 Produce the EH_frame# symbols if needed. 
llvm-svn: 130378
 2011-04-28 03:26:11 +00:00
Rafael Espindola
d2ef63ca76 Forward isFunctionEHFrameSymbolPrivate. If it is false, produce the foo.eh 
symbols.

llvm-svn: 130375
 2011-04-28 02:46:42 +00:00
Rafael Espindola
7728a01105 Force some values to be absolute and align based on the FDE pointers size. A small 
step towards using .cfi_* on OS X.

llvm-svn: 130273
 2011-04-27 01:43:49 +00:00
Chandler Carruth
d09040ad66 Delete the other unused variable in this function. Sorry I missed this 
the first time through.

llvm-svn: 129969
 2011-04-22 01:29:18 +00:00
Chandler Carruth
a0a38b7d6e Remove an unused variable from a function. This is a likely cut-paste-o. 
Silences GCC warning.

I wonder why Clang doesn't warn on this...

llvm-svn: 129968
 2011-04-22 01:21:06 +00:00
Rafael Espindola
717fc5112a Compute the size of the FDE encoding instead of hard coding it. Update 
X8664_ELFTargetObjectFile::getFDEEncoding to match reality.

llvm-svn: 129959
 2011-04-22 00:08:43 +00:00
Rafael Espindola
856ed14418 Remove unused argument. 
llvm-svn: 129955
 2011-04-21 23:39:26 +00:00
Rafael Espindola
1afc1304c7 Don't pass address spaces to EmitULEB128IntValue. 
llvm-svn: 129953
 2011-04-21 23:26:40 +00:00
Rafael Espindola
9f6146c464 Remove LastOffset from the asm parser. 
llvm-svn: 129378
 2011-04-12 18:53:30 +00:00
Rafael Espindola
5c5bb3e9a6 Fix the case of a .cfi_rel_offset before any .cfi_def_cfa_offset. 
llvm-svn: 129362
 2011-04-12 16:12:03 +00:00
Rafael Espindola
7c4de15c7b Implement .cfi_same_value. 
llvm-svn: 129361
 2011-04-12 15:31:05 +00:00
Anton Korobeynikov
cf5967630b Rename TargetFrameInfo into TargetFrameLowering. Also, put couple of FIXMEs and fixes here and there. 
llvm-svn: 123170
 2011-01-10 12:39:04 +00:00
Benjamin Kramer
c84434924f Make a bunch of symbols internal. 
llvm-svn: 122642
 2010-12-30 22:34:44 +00:00
Rafael Espindola
7b1b3f5d82 Correctly encode pcrel|indirect. 
llvm-svn: 122624
 2010-12-29 04:31:26 +00:00
Rafael Espindola
0408a378e9 Fix bug when trying to output uint16_t or uint32_t. 
llvm-svn: 122615
 2010-12-29 02:30:49 +00:00
Rafael Espindola
d51ed1fc6a Implement cfi_def_cfa. Also don't convert to dwarf reg numbers twice. Looks 
like 6 is a fixed point of that and so the previous tests were OK :-)

llvm-svn: 122614
 2010-12-29 01:42:56 +00:00
Rafael Espindola
d93ec3572d Don't produce a "DW_CFA_advance_loc 0". 
llvm-svn: 122609
 2010-12-28 23:38:03 +00:00
Rafael Espindola
3fdd045643 Implement .cfi_remember_state and .cfi_restore_state. 
llvm-svn: 122602
 2010-12-28 18:36:23 +00:00
Duncan Sands
4799c69192 Fix warning about size potentially being used uninitialized 
when doing a release build.

llvm-svn: 122594
 2010-12-28 10:02:42 +00:00
Rafael Espindola
c97d642bf7 Relax address updates in the eh_frame section. 
llvm-svn: 122591
 2010-12-28 05:39:27 +00:00
Rafael Espindola
0552cb0638 Start adding basic support for emitting the call frame instructions. 
llvm-svn: 122590
 2010-12-28 04:15:37 +00:00
Rafael Espindola
12c30aed07 Add support for .cfi_lsda. 
llvm-svn: 122584
 2010-12-27 15:56:22 +00:00
Rafael Espindola
e7e67fce10 Add support for the same encodings of the personality function that gnu as 
supports.

llvm-svn: 122577
 2010-12-27 00:36:05 +00:00
Rafael Espindola
e9e6794917 Fix .cfi_personality on 32 bit systems. 
llvm-svn: 122570
 2010-12-26 22:47:37 +00:00
Rafael Espindola
99f1527316 Add basic support for .cfi_personality. 
llvm-svn: 122566
 2010-12-26 20:20:31 +00:00
Rafael Espindola
bd13ceed72 "Fix" FDE alignment to match what gas does. 
llvm-svn: 122006
 2010-12-17 00:28:02 +00:00
Rafael Espindola
0e665e502d Fixed version of 121434 with no new memory leaks. 
llvm-svn: 121471
 2010-12-10 07:39:47 +00:00
Rafael Espindola
011e168728 Revert my previous patch to make the valgrind bots happy. 
llvm-svn: 121461
 2010-12-10 04:01:09 +00:00
Rafael Espindola
03ad1e8f1f Initial support for the cfi directives. This is just enough to get 
f:
        .cfi_startproc
        nop
        .cfi_endproc

assembled (on ELF).

llvm-svn: 121434
 2010-12-09 23:48:29 +00:00
Rafael Espindola
ebe4cab1db Use const references. 
llvm-svn: 121426
 2010-12-09 23:08:35 +00:00
Rafael Espindola
3e954d16f4 Second try at making direct object emission produce the same results 
as llc + llvm-mc. This time ELF is not changed and I tested that llvm-gcc
bootstrap on darwin10 using darwin9's assembler and linker.

llvm-svn: 121006
 2010-12-06 17:27:56 +00:00
Rafael Espindola
4ec917db9b Revert previous two patches while I try to find out how to make both 
linux and darwin assemblers happy :-(

llvm-svn: 121004
 2010-12-06 15:35:15 +00:00
Rafael Espindola
3dc2b4cba7 Add an EmitAbsValue helper method and use it in cases where we want to be sure 
that no relocations are used (on MochO).
Fixes llc producing different output from llc + llvm-mc.

llvm-svn: 121000
 2010-12-06 14:53:14 +00:00
Rafael Espindola
1bf8d261f1 Remember the contents of leb and dwarfline fragments when relaxing. This avoids 
having to evaluate the expression again when writing.

llvm-svn: 120920
 2010-12-04 21:58:52 +00:00
Rafael Espindola
9215947c83 There are two reasons why we might want to use 
foo = a - b
.long foo
instead of just
.long a - b

First, on darwin9 64 bits the assembler produces the wrong result. Second,
if "a" is the end of the section all darwin assemblers (9, 10 and mc) will not
consider a - b to be a constant but will if the dummy foo is created.

Split how we handle these cases. The first one is something MC should take care
of. The second one has to be handled by the caller.

llvm-svn: 120889
 2010-12-04 03:21:47 +00:00
Rafael Espindola
50b6170457 Next step: Only pad debug_line when the target is darwin. Add a FIXME to avoid 
doing that if the target is darwin10 or newer.

This fixes
*) Direct object emission was producing objects without the workaround on
   darwin9.
*) Assembly printing was producing objects with the workaround on linux.

llvm-svn: 120866
 2010-12-04 00:31:13 +00:00
Rafael Espindola
4145acdc3b First step in fixing MC. Make it clear that we are avoiding a bug in the 
darwin9 linker, what is needed to avoid it and where to get more information.

Also make the workaround simpler. Just the regular end_sequence we normally
create is more than 4 bytes.

Tested by building cctools and ld64 from darwin9 on a darwin10 system and using
those. I checked that I was able to reproduce the bootstrap failure when
the the workaround was disabled.

llvm-svn: 120854
 2010-12-03 23:36:59 +00:00
Rafael Espindola
3e119b0bb4 Try to resolve symbol differences early, and if successful create a plain 
data fragment. This reduces the time to assemble the test in 8711 from 60s to
54s.

llvm-svn: 120767
 2010-12-03 00:55:40 +00:00
Devang Patel
77a1457f1a It may not be an option to skip .debug_line if there are file reference in already emitted debug info. So, for now, emit dummy line table entry to make older linker and assemblers happy. This is not a new behavior, original AsmPrinter emitted similar line table entries. 
llvm-svn: 120760
 2010-12-03 00:10:48 +00:00
Devang Patel
822facd787 Use set directive for StartMinusEndExpr. 
This is a fix for llvm-gcc-i386-darwin9 buildbot failure.

llvm-svn: 120742
 2010-12-02 21:32:30 +00:00
Rafael Espindola
5f582e980e Remove some #includes. 
llvm-svn: 119967
 2010-11-22 11:53:17 +00:00
Rafael Espindola
7c6bd9e0f9 Add a MCLineSectionOrder vector so that we produce the line tables in a 
deterministic order.

llvm-svn: 119795
 2010-11-19 07:41:23 +00:00
Rafael Espindola
b33e5e07e1 Change some methods in MCDwarf.cpp to be able to handle an arbitrary 
MCStreamer instead of just MCObjectStreamer. Address changes cannot
be as efficient as we have to use DW_LNE_set_addres, but at least
most of the logic is shared.

This will be used so that, with CodeGen still using EmitDwarfLocDirective,
llvm-gcc is able to produce debug_line sections without needing an
assembler that supports .loc.

llvm-svn: 119777
 2010-11-19 02:26:16 +00:00
Rafael Espindola
e296fd654b Fix the encoding of negative line deltas. 
llvm-svn: 118962
 2010-11-13 01:06:27 +00:00
Rafael Espindola
77cad43f26 Remove what looks like dead code in the production of debug lines. 
We only produce debug line information if we have seen a line directive, so
this code is dead. Also, if we want to be bug by bug compatible with
gas and sometimes produce "empty" .debug_line sections, this will
match the content produced by gas.

llvm-svn: 118914
 2010-11-12 18:41:26 +00:00
Rafael Espindola
1db6a21aff Add support for expressions in .sleb/.uleb directives. 
llvm-svn: 118023
 2010-11-02 17:22:24 +00:00
Kevin Enderby
01b93a4319 Incorporate suggestions by Daniel Dunbar after his review. Thanks Daniel! 
1) Changed ValidateDwarfFileNumber() to isValidDwarfFileNumber() to be better
   named.  Since it is just a predicate and isn't actually changing any state.

2) Added a missing return in the comments for setCurrentDwarfLoc() in 
   include/llvm/MC/MCContext.h for fix formatting.

3) Changed clearDwarfLocSeen() to ClearDwarfLocSeen() since it does change
   state.

4) Simplified the last test in isValidDwarfFileNumber() to just a one line
   boolean test of MCDwarfFiles[FileNumber] != 0 for the final return statement.

llvm-svn: 115551
 2010-10-04 20:17:24 +00:00
Kevin Enderby
767a9365f0 This is the last major patch to implement support for the .loc directive 
and output the dwarf line number tables.  This contains the code to emit and
encode the dwarf line tables from the previously gathered information in the
MCLineSection objects.  This contains all the details to encode the line and
address deltas into the dwarf line table.

To do this an MCDwarfLineAddrFragment has been added.

Also this moves the interface code out of Mach-O streamer into
MCDwarf so it should be useable by other object file formats.

There is now one call to be made from an MCObjectStreamer
EmitInstruction() method:
   MCLineEntry::Make(this, getCurrentSection());
to create a line entry after each instruction is assembled.

And one call call to be made from an MCObjectStreamer Finish() method:
   MCDwarfFileTable::Emit(this, DwarfLineSection);
when getContext().hasDwarfFiles() is true and is passed a object file specific
MCSection where to emit the dwarf file and the line tables.

This appears to now be correct for 32-bit targets, at least x86.  But the
relocation entries for 64-bit Darwin needs some further work which is next
up to work on.  So for now the 64-bit Mach-O target does not output the
dwarf file and line tables.

llvm-svn: 115157
 2010-09-30 16:52:03 +00:00
Kevin Enderby
3f202e65e8 Added first bit of support for the dwarf .file directive. This patch collects 
the info from the .file directive and makes file and directory tables that
will eventually be put out as part of the dwarf info in the output file.

llvm-svn: 109651
 2010-07-28 20:55:35 +00:00