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Author SHA1 Message Date
Bill Wendling c3a9376215 A much cleaner (and less code!) way of inserting the correct amount of padding 
for alignment into the LSDA. If the TType base offset is emitted, then put the
padding there. Otherwise, put it in the call site table length. There will be no
conflict between the two sites when placing the padding in one place.

llvm-svn: 97277
 2010-02-26 22:17:52 +00:00
Bill Wendling fea6c4efc7 Comment typo. 
llvm-svn: 97269
 2010-02-26 21:31:01 +00:00
Bill Wendling 098c91e95b Fix comments. 
llvm-svn: 97200
 2010-02-26 01:12:52 +00:00
Bill Wendling 6394521a2b Add another (and hopefully the last) exception case, where once we recalculate 
the alignment requirement, if it no longer makes the TType base offset overflow
into extra bytes, then we need to pad to those bytes ourselves.

llvm-svn: 97196
 2010-02-26 00:43:54 +00:00
Bill Wendling 6f14f6a962 And should use the correct variable. 
llvm-svn: 97193
 2010-02-26 00:24:25 +00:00
Bill Wendling 47c3269236 Got assertion check backwards. 
llvm-svn: 97192
 2010-02-26 00:22:42 +00:00
Bill Wendling 24c74f1d9c Catch a corner case where adding the padding to the "TType base offset" field 
will eliminate the need for padding in the "Call site table length". E.g., if
we have this:

    GCC_except_table1:
    Lexception1:
        .byte   0xff  ## @LPStart Encoding = omit
        .byte   0x9b  ## @TType Encoding = indirect pcrel sdata4
        .byte   0x7f  ## @TType base offset
        .byte   0x03  ## Call site Encoding = udata4
        .byte   0x89  ## Call site table length

with padding of 1. We want to emit the padding like this:
 
    GCC_except_table1:
    Lexception1:
        .byte   0xff  ## @LPStart Encoding = omit
        .byte   0x9b  ## @TType Encoding = indirect pcrel sdata4
        .byte   0xff  ## @TType base offset
        .space  1,0   ## Padding
        .byte   0x03  ## Call site Encoding = udata4
        .byte   0x89  ## Call site table length

and not with padding on the "Call site table length" entry.

llvm-svn: 97183
 2010-02-25 23:52:44 +00:00
Bill Wendling 60aa4dfb53 Make comment more meaningful. 
llvm-svn: 97169
 2010-02-25 21:19:47 +00:00
Bill Wendling 88fdcd323d LLVM puts padding bytes in the __gcc_except_tab section after the 
GCC_except_table label but before the Lexception, which the FDE references.
This causes problems as the FDE does not point to the start of an LSDA chunk.

Use an unnormalized uleb128 for the call-site table length that includes the
padding.

llvm-svn: 97078
 2010-02-24 23:34:35 +00:00
Anton Korobeynikov 5d438e4ad2 Use ttype encoding consistently 
llvm-svn: 96290
 2010-02-15 22:38:25 +00:00
Anton Korobeynikov ec2ba08d16 It turns out that we emitted completely wrong common EH frame since the early beginning! The "z" CIE augmentation mark indicates that there is an extra word containing the size of augmentation section. However, even for frames w/o any augmentation data we emitted size uleb! (this is the case of "unwinding through C code"). Thus frame moves information was emitterd completely wrong. 
llvm-svn: 96287
 2010-02-15 22:36:41 +00:00
Anton Korobeynikov ae4ccc10da Preliminary patch to improve dwarf EH generation - Hooks to return Personality / FDE / LSDA / TType encoding depending on target / options (e.g. code model / relocation model) - MCIzation of Dwarf EH printer to use encoding information - Stub generation for ELF target (needed for indirect references) - Some other small changes here and there 
llvm-svn: 96285
 2010-02-15 22:35:59 +00:00
Bill Wendling 243e1f21db Use .empty() instead of .size(). 
llvm-svn: 95871
 2010-02-11 10:37:57 +00:00
Bill Wendling 7742b6406b Use an index instead of pointers into the vector. If the vector resizes, then 
the pointer values could be invalid.

llvm-svn: 95813
 2010-02-10 21:41:57 +00:00
Bill Wendling a0cd0e11c9 Improve comments a even more. 
llvm-svn: 95740
 2010-02-10 00:59:47 +00:00
Bill Wendling b188e92ca9 Improve comments a bit more. 
llvm-svn: 95737
 2010-02-10 00:45:28 +00:00
Bill Wendling bf02536262 Improve comments in the LSDA somewhat. They can be improved much more. 
llvm-svn: 95707
 2010-02-09 22:49:16 +00:00
Jim Grosbach 54c0530834 Update of 94055 to track the IR level call site information via an intrinsic. 
This allows code gen and the exception table writer to cooperate to make sure
landing pads are associated with the correct invoke locations.

llvm-svn: 94726
 2010-01-28 01:45:32 +00:00
Chris Lattner 76555b513c constify a bunch of dwarf stuff now that the registerinfo method 
is constified.

llvm-svn: 94613
 2010-01-26 23:18:02 +00:00
Chris Lattner 0bfd279b37 mcize visibility directives. 
llvm-svn: 94295
 2010-01-23 06:53:23 +00:00
Chris Lattner 685508cf49 move the various directive enums out of the MCStreamer class 
into a new MCDirectives.h file.

llvm-svn: 94294
 2010-01-23 06:39:22 +00:00
Chris Lattner 1deb09c28d mcstreamerize .no_dead_strip and .reference for static ctors/dtors. 
llvm-svn: 94290
 2010-01-23 05:51:36 +00:00
Chris Lattner c3f23b84ea remove one form of EmitString, just use EmitBytes instead. We must 
be careful to add a \0 at the end though, because EmitString didn't
do this.

llvm-svn: 94277
 2010-01-23 03:11:46 +00:00
Chris Lattner 6f2d99df03 move "EOL" from asmprinter to dwarfprinter. It should eventually 
be completely eliminated, but today is not that day.

llvm-svn: 94253
 2010-01-22 23:47:11 +00:00
Chris Lattner fa82355f33 move uleb printing from asmprinter to dwarfprinter, mcize, 
cleanup and eliminate a bunch more uses of "EOL".

llvm-svn: 94250
 2010-01-22 23:18:42 +00:00
Chris Lattner 2303145081 move sleb printing out of asmprinter into dwarf printer, make clients 
handle the comment better, MCize the non-.sleb case.

llvm-svn: 94244
 2010-01-22 22:56:55 +00:00
Chris Lattner edf96a4cc3 add a new DwarfPrinter::EmitEncodingByte method which handles 
pretty printing encoding comments and eliminates redundancy on
the client side.  We now get pretty dwarf like this again:

        .byte   255                                         ## @LPStart Encoding = omit
        .byte   0                                           ## @TType Encoding = absptr
        .byte   0x28                                        ## @TType base offset
        .byte   3                                           ## Call site Encoding = udata4
        .byte   0x1a                                        ## Call site table size
...

llvm-svn: 94239
 2010-01-22 22:38:16 +00:00
Chris Lattner 69bb026835 rename the dwarf class to DwarfPrinter. This matches the filename 
and much more accurately describes what it is all about.

llvm-svn: 94233
 2010-01-22 22:23:57 +00:00
Chris Lattner f5c834fce1 inline away the trivial AsmPrinter::EOL() method. 
llvm-svn: 94230
 2010-01-22 22:09:00 +00:00
Jim Grosbach 143f7eb4c8 back this out for now. Growing Function is not good. 
llvm-svn: 94097
 2010-01-21 20:10:22 +00:00
Jim Grosbach e029a6a5ed Make sure that landing pad entries in the EH call site table are in the proper 
order for SjLj style exception handling.

llvm-svn: 94055
 2010-01-21 00:43:30 +00:00
Chris Lattner 71601e8b3b eliminate some uses of AsmPrinter::EmitIntXXX 
llvm-svn: 93996
 2010-01-20 07:41:15 +00:00
Bill Wendling a73e471c62 - Add a comment to the callback indicating that it's *extremely* not a good 
idea, but unfortunately necessary.
- Default to using 4-bytes for the LSDA pointer encoding to agree with the
  encoded value in the CIE.

llvm-svn: 93753
 2010-01-18 19:36:27 +00:00
Chris Lattner c8f7717808 remove the MAI argument to MCExpr::print and switch overthing to use << when printing them. 
llvm-svn: 93699
 2010-01-18 00:37:40 +00:00
Chris Lattner 8b5d55ed06 now that MCSymbol::print doesn't use it's MAI argument, we can 
remove it and change all the code that prints MCSymbols to use 
<< instead, which is much simpler and cleaner.

llvm-svn: 93695
 2010-01-17 21:43:43 +00:00
Chris Lattner f62e3ee8c5 move the mangler into libtarget from vmcore. 
llvm-svn: 93664
 2010-01-16 21:57:06 +00:00
Chris Lattner 555ceabe64 rename GetPrivateGlobalValueSymbolStub -> GetSymbolWithGlobalValueBase, 
and add an explicit ForcePrivate argument.

Switch FunctionEHFrameInfo to be MCSymbol based instead of string based.

llvm-svn: 93646
 2010-01-16 18:37:32 +00:00
Bill Wendling bf5cfa1a41 Retrying r91337: 
The CIE says that the LSDA point in the FDE section is an "sdata4". That's fine,
but we need it to actually be 4-bytes in the FDE for some platforms. Allow
individual platforms to decide for themselves.

llvm-svn: 93616
 2010-01-16 01:40:55 +00:00
Chris Lattner f81add3fdf move these out of their own timer groups into the 'uncategorized' groups. 
llvm-svn: 92206
 2009-12-28 07:41:18 +00:00
Bill Wendling 03b5aed7d8 Temporarily revert 91337. It's causing testcase failures. 
$ svn merge -c -91337 https://llvm.org/svn/llvm-project/llvm/trunk
--- Reverse-merging r91337 into '.':
U    lib/CodeGen/AsmPrinter/DwarfException.cpp

llvm-svn: 91618
 2009-12-17 20:41:01 +00:00
Bill Wendling 1bdf5d6f75 The CIE says that the LSDA point in the FDE section is an "sdata4". That's fine, 
but we need it to actually be 4-bytes in the FDE.

llvm-svn: 91337
 2009-12-14 21:49:44 +00:00
Bill Wendling 31c74dbb10 Reverting the EH table patches. 
$ svn merge -c -89279 https://llvm.org/svn/llvm-project/llvm/trunk
--- Reverse-merging r89279 into '.':
U    lib/CodeGen/AsmPrinter/DwarfException.cpp
U    lib/Target/TargetLoweringObjectFile.cpp
$ svn merge -c -89270 https://llvm.org/svn/llvm-project/llvm/trunk
--- Reverse-merging r89270 into '.':
G    lib/CodeGen/AsmPrinter/DwarfException.cpp
G    lib/Target/TargetLoweringObjectFile.cpp

llvm-svn: 89379
 2009-11-19 19:21:09 +00:00
Bill Wendling 4b384b0294 The "ReadOnlyWithRel" enum seems to apply more to what Darwin does with the EH 
exception table than DataRel.

llvm-svn: 89279
 2009-11-19 00:09:14 +00:00
Bill Wendling 07e6e2c6f8 Attempt #2: 
Place the EH table in the __TEXT section on MachO. It saves space.

llvm-svn: 89270
 2009-11-18 23:18:46 +00:00
Bill Wendling bc0020174b Refactor the code that creates the "dot-label" difference. This may be used in 
more than one place. No intended functionality change.

llvm-svn: 89024
 2009-11-17 01:23:53 +00:00
Bill Wendling c781d7a072 Simplify code a bit 
llvm-svn: 87040
 2009-11-12 23:13:08 +00:00
Bill Wendling e412064c4c Refactor code that checks if it's a call to a "nounwind" function. 
llvm-svn: 87036
 2009-11-12 21:59:20 +00:00
Bill Wendling e3ae25b3d8 If there's more than one function operand to a call instruction, be conservative 
and don't assume that the call doesn't throw. It would be nice if there were a
way to determine which is the callee and which is a parameter. In practice, the
architecture we care about normally only have one operand for a call instruction
(x86 and arm).

llvm-svn: 87023
 2009-11-12 20:51:53 +00:00
Bill Wendling 7a6b11e707 Don't mark a call as potentially throwing if the function it's calling has the 
"nounwind" attribute.

llvm-svn: 86897
 2009-11-11 23:17:02 +00:00
Bill Wendling 676f44062e Make sure that the exception handling data has the same visibility as the 
function it's generated for.

llvm-svn: 86779
 2009-11-11 01:24:59 +00:00