variable if recursing fails to simplify it.

Factor AliasedSymbol to be a method of MCSymbol.

Update MCAssembler::EvaluateFixup to match the change in
EvaluateAsRelocatableImpl.

Remove the WeakRefExpr hack, as the object writer now sees the weakref with
no extra effort needed.

Nothing else is using MCTargetExpr, but keep it for now.

Now that the ELF writer sees relocations with aliases, handle

    .weak    foo2
foo2:
    .weak    bar2
    .set    bar2,foo2
    .quad    bar2

the same way gas does and produce a relocation with bar2.

llvm-svn: 119152

Added 2 new subclasses - X86ELFObjectWriter and ARMELFObectWriter.
ARM and X86 require different code for RecordRelocation(), possibly others.

llvm-svn: 119149

This moves most of the isUsed logic to the MCSymbol itself. With this we
get a bit more relaxed about allowing definitions after uses: uses that
don't evaluate their argument immediately (jmp foo) are accepted.

ddunbar, this was the smallest compromise I could think of that lets us
accept gcc (and clang!) assembly.

llvm-svn: 119144

llvm-svn: 119122

nodes to indicate when ha16/lo16 modifiers should be used.  This lets
us pass PowerPC/indirectbr.ll.

The one annoying thing about this patch is that the MCSymbolExpr isn't
expressive enough to represent ha16(label1-label2) which we need on
PowerPC.  I have a terrible hack in the meantime, but this will have
to be revisited at some point.

Last major conversion item left is global variable references.

llvm-svn: 119105

a central location. This also makes us a bit more compatible with gas.

llvm-svn: 119094

on the operand, required for .o file writing and fixing 
the PowerPC/mult-alt-generic-powerpc64.ll failure with the new
instprinter.

llvm-svn: 119087

directive.

llvm-svn: 119073

llvm-svn: 119060

signature symbol causes a local symbol to be created unless there is
some other use of the symbol.

llvm-svn: 119026

the symbols.

llvm-svn: 119022

llvm-svn: 119021

 - What was I thinking?????

llvm-svn: 118992

llvm-svn: 118981

llvm-svn: 118980

another patch.
This lets us parse a bit more of the gcc 4.5 output.

llvm-svn: 118975

llvm-svn: 118962

llvm-svn: 118920

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

llvm-svn: 118893

llvm-svn: 118831

gas.

llvm-svn: 118818

llvm-svn: 118805

a weakref is used with a VariantKind.

llvm-svn: 118798

easier to read by having const references to the symbol, aliased symbol and
renamed symbol.

llvm-svn: 118793

a leftover from the removal of isExplicit.

llvm-svn: 118774

llvm-svn: 118733

llvm-svn: 118728

llvm-svn: 118725

llvm-svn: 118722

llvm-svn: 118709

llvm-svn: 118699

VariantKind marker to indicate the additional information necessary. Update
MC to handle the new Kinds. rdar://8647623

llvm-svn: 118671

earlier. Implicit bool -> int conversions are evil!

llvm-svn: 118651

llvm-svn: 118645

llvm-svn: 118639

llvm-svn: 118421

llvm-svn: 118395

This is really slow with we have 1000s of sections each with a corresponding
relocation section. Also, it is only used by the ELF writer to add
basic data, so there is no need to force a new layout pass.

Should fix PR8563.

llvm-svn: 118377

llvm-svn: 118365