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Move "local commons" to the end of .bss to match the gnu as behavior.
llvm-svn: 115037
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1b3d55417c
commit
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@ -111,6 +111,13 @@ public:
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virtual void Finish();
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private:
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struct LocalCommon {
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MCSymbolData *SD;
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uint64_t Size;
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unsigned ByteAlignment;
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};
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std::vector<LocalCommon> LocalCommons;
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SmallPtrSet<MCSymbol *, 16> BindingExplicitlySet;
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/// @}
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void SetSection(StringRef Section, unsigned Type, unsigned Flags,
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@ -343,17 +350,10 @@ void MCELFStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
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MCSectionELF::SHF_WRITE |
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MCSectionELF::SHF_ALLOC,
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SectionKind::getBSS());
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MCSectionData &SectData = getAssembler().getOrCreateSectionData(*Section);
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new MCAlignFragment(ByteAlignment, 0, 1, ByteAlignment, &SectData);
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MCFragment *F = new MCFillFragment(0, 0, Size, &SectData);
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SD.setFragment(F);
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Symbol->setSection(*Section);
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// Update the maximum alignment of the section if necessary.
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if (ByteAlignment > SectData.getAlignment())
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SectData.setAlignment(ByteAlignment);
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struct LocalCommon L = {&SD, Size, ByteAlignment};
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LocalCommons.push_back(L);
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} else {
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SD.setCommon(Size, ByteAlignment);
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}
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@ -499,6 +499,26 @@ void MCELFStreamer::EmitInstruction(const MCInst &Inst) {
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}
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void MCELFStreamer::Finish() {
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for (std::vector<LocalCommon>::const_iterator i = LocalCommons.begin(),
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e = LocalCommons.end();
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i != e; ++i) {
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MCSymbolData *SD = i->SD;
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uint64_t Size = i->Size;
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unsigned ByteAlignment = i->ByteAlignment;
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const MCSymbol &Symbol = SD->getSymbol();
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const MCSection &Section = Symbol.getSection();
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MCSectionData &SectData = getAssembler().getOrCreateSectionData(Section);
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new MCAlignFragment(ByteAlignment, 0, 1, ByteAlignment, &SectData);
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MCFragment *F = new MCFillFragment(0, 0, Size, &SectData);
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SD->setFragment(F);
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// Update the maximum alignment of the section if necessary.
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if (ByteAlignment > SectData.getAlignment())
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SectData.setAlignment(ByteAlignment);
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}
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// FIXME: We create more atoms than it is necessary. Some relocations to
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// merge sections can be implemented with section address + offset,
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// figure out which ones and why.
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21
test/MC/ELF/common2.s
Normal file
21
test/MC/ELF/common2.s
Normal file
@ -0,0 +1,21 @@
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// RUN: llvm-mc -filetype=obj -triple x86_64-pc-linux-gnu %s -o - | elf-dump | FileCheck %s
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// Test that the common symbols are placed at the end of .bss. In this example
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// it causes .bss to have size 9 instead of 8.
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.local vimvardict
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.comm vimvardict,1,8
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.bss
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.zero 1
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.align 8
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// CHECK: (('sh_name', 13) # '.bss'
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// CHECK-NEXT: ('sh_type',
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// CHECK-NEXT: ('sh_flags'
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// CHECK-NEXT: ('sh_addr',
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// CHECK-NEXT: ('sh_offset',
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// CHECK-NEXT: ('sh_size', 9)
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// CHECK-NEXT: ('sh_link',
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// CHECK-NEXT: ('sh_info',
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// CHECK-NEXT: ('sh_addralign',
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// CHECK-NEXT: ('sh_entsize',
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