void foo() { __builtin_unreachable(); }

It will output the following on Darwin X86:

_func1:
Leh_func_begin0:
        pushq %rbp
Ltmp0:
        movq %rsp, %rbp
Ltmp1:
Leh_func_end0:

This prolog adds a new Call Frame Information (CFI) row to the FDE with an
address that is not within the address range of the code it describes -- part is
equal to the end of the function -- and therefore results in an invalid EH
frame. If we emit a nop in this situation, then the CFI row is now within the
address range.

llvm-svn: 108568

thus is a much more meaningful name.

llvm-svn: 108563

TII::isMoveInstr is going tobe completely removed.

llvm-svn: 108507

follow on to r103765

llvm-svn: 108390

llvm-svn: 107930

Relax assertion. In optimized code, it is possible that first instruction is coming from a inlined function.
This fixes PR7596 .

llvm-svn: 107923

llvm-svn: 107919

Reuse DIEInteger for 1. This is frequently used while emitting an attribute using dwarf::DW_FORM_flag form.

llvm-svn: 107903

Keep track of abstract subprogram DIEs. 

llvm-svn: 107822

llvm-svn: 107810

llvm-svn: 107807

PrologEpilog code, and use it to determine whether
the asm forces stack alignment or not.  gcc consistently
does not do this for GCC-style asms; Apple gcc inconsistently
sometimes does it for asm blocks.  There is no
convenient place to put a bit in either the SDNode or
the MachineInstr form, so I've added an extra operand
to each; unlovely, but it does allow for expansion for
more bits, should we need it.  PR 5125.  Some
existing testcases are affected.
The operand lists of the SDNode and MachineInstr forms
are indexed with awesome mnemonics, like "2"; I may
fix this someday, but not now.  I'm not making it any
worse.  If anyone is inspired I think you can find all
the right places from this patch.

llvm-svn: 107506

will still be stripped by the linker when it generates the final image.

llvm-svn: 107440

Objective-C metadata types which should be marked as "weak", but which the
linker will remove upon final linkage. However, this linkage isn't specific to
Objective-C.

For example, the "objc_msgSend_fixup_alloc" symbol is defined like this:

      .globl l_objc_msgSend_fixup_alloc
      .weak_definition l_objc_msgSend_fixup_alloc
      .section __DATA, __objc_msgrefs, coalesced
      .align 3
l_objc_msgSend_fixup_alloc:
       .quad   _objc_msgSend_fixup
       .quad   L_OBJC_METH_VAR_NAME_1

This is different from the "linker_private" linkage type, because it can't have
the metadata defined with ".weak_definition".

Currently only supported on Darwin platforms.

llvm-svn: 107433

This is a regression caused by r106792 and caught by gdb testsuite.

llvm-svn: 107430

llvm-svn: 107426

llvm-svn: 107360

llvm-svn: 107237

Add variables into a scope before constructing scope DIE otherwise variables won't be included DIE tree. 

llvm-svn: 107228

llvm-svn: 107215

llvm-svn: 107214

metadata types which should be marked as "weak", but which the linker will
remove upon final linkage. For example, the "objc_msgSend_fixup_alloc" symbol is
defined like this:

       .globl l_objc_msgSend_fixup_alloc
       .weak_definition l_objc_msgSend_fixup_alloc
       .section __DATA, __objc_msgrefs, coalesced
       .align 3
l_objc_msgSend_fixup_alloc:
        .quad   _objc_msgSend_fixup
        .quad   L_OBJC_METH_VAR_NAME_1

This is different from the "linker_private" linkage type, because it can't have
the metadata defined with ".weak_definition".

llvm-svn: 107205

Inspired by Artur Pietrek.

llvm-svn: 107202

llvm-svn: 107085

llvm-svn: 107065

Radar 8122864.

llvm-svn: 107027

llvm-svn: 106990

llvm-svn: 106895

DBG_VALUE machine instruction pointing to undefined register for a variable justify a separate scope if the variable is inlined function's argument.
Radar 8122864.

llvm-svn: 106792

getNamedMetadata().

llvm-svn: 106518

llvm-svn: 106516

llvm-svn: 106515

switch from this:

  if (TimePassesIsEnabled) {
    NamedRegionTimer T(Name, GroupName);
    do_something();
  } else {
    do_something(); // duplicate the code, this time without a timer!
  }

to this:

  {
    NamedRegionTimer T(Name, GroupName, TimePassesIsEnabled);
    do_something();
  }

llvm-svn: 106285

This speeds up local variable handling in DwarfDebug.

llvm-svn: 106075

llvm-svn: 106073

llvm-svn: 106063

llvm-svn: 105828

llvm-svn: 105511

llvm-svn: 105492

llvm-svn: 105379