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MC/ELF: Allow null values in virtual sections, ELF doesn't use special

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directives for putting contents in .bss, for example.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111376 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Daniel Dunbar 2010-08-18 18:22:37 +00:00
parent 6b63037306
commit c983b20661
3 changed files with 29 additions and 1 deletions
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17
lib/MC/MCAssembler.cpp
View File

@ -628,8 +628,23 @@ void MCAssembler::WriteSectionData(const MCSectionData *SD,
switch (it->getKind()) {
default:
assert(0 && "Invalid fragment in virtual section!");
case MCFragment::FT_Data: {
// Check that we aren't trying to write a non-zero contents (or fixups)
// into a virtual section. This is to support clients which use standard
// directives to fill the contents of virtual sections.
MCDataFragment &DF = cast<MCDataFragment>(*it);
assert(DF.fixup_begin() == DF.fixup_end() &&
"Cannot have fixups in virtual section!");
for (unsigned i = 0, e = DF.getContents().size(); i != e; ++i)
assert(DF.getContents()[i] == 0 &&
"Invalid data value for virtual section!");
break;
}
case MCFragment::FT_Align:
assert(!cast<MCAlignFragment>(it)->getValueSize() &&
// Check that we aren't trying to write a non-zero value into a virtual
// section.
assert((!cast<MCAlignFragment>(it)->getValueSize() ||
!cast<MCAlignFragment>(it)->getValue()) &&
"Invalid align in virtual section!");
break;
case MCFragment::FT_Fill:

8
test/MC/ELF/bss.ll Normal file
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@ -0,0 +1,8 @@
; RUN: llc -filetype=obj %s -o %t
; FIXME: Add ELF dumping tool to check results.
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32-n8:16:32"
target triple = "i386-pc-linux-gnu"
@g0 = global i8* null, align 4 ; <i8**> [#uses=0]

5
test/MC/ELF/dg.exp Normal file
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@ -0,0 +1,5 @@
load_lib llvm.exp
if { [llvm_supports_target X86] } {
RunLLVMTests [lsort [glob -nocomplain $srcdir/$subdir/*.{ll}]]
}