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d98ed2e336
SUMMARY:
in the aix assembly , it do not have .hidden and .protected directive.
in current llvm. if a function or a variable which has visibility attribute, it will generate something like the .hidden or .protected , it can not recognize by aix as.
in aix assembly, the visibility attribute are support in the pseudo-op like
.extern Name [ , Visibility ]
.globl Name [, Visibility ]
.weak Name [, Visibility ]
in this patch, we implement the visibility attribute for the global variable, function or extern function .
for example.
extern __attribute__ ((visibility ("hidden"))) int
bar(int* ip);
__attribute__ ((visibility ("hidden"))) int b = 0;
__attribute__ ((visibility ("hidden"))) int
foo(int* ip){
return (*ip)++;
}
the visibility of .comm linkage do not support , we will have a separate patch for it.
we have the unsupported cases ("default" and "internal") , we will implement them in a a separate patch for it.
Reviewers: Jason Liu ,hubert.reinterpretcast,James Henderson
Differential Revision: https://reviews.llvm.org/D75866
40 lines
1.6 KiB
C++
40 lines
1.6 KiB
C++
//===- MCXCOFFObjectStreamer.h - MCStreamer XCOFF Object File Interface ---===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_MC_MCXCOFFSTREAMER_H
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#define LLVM_MC_MCXCOFFSTREAMER_H
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#include "llvm/MC/MCObjectStreamer.h"
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namespace llvm {
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class MCXCOFFStreamer : public MCObjectStreamer {
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public:
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MCXCOFFStreamer(MCContext &Context, std::unique_ptr<MCAsmBackend> MAB,
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std::unique_ptr<MCObjectWriter> OW,
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std::unique_ptr<MCCodeEmitter> Emitter);
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bool emitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) override;
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void emitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
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unsigned ByteAlignment) override;
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void emitZerofill(MCSection *Section, MCSymbol *Symbol = nullptr,
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uint64_t Size = 0, unsigned ByteAlignment = 0,
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SMLoc Loc = SMLoc()) override;
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void emitInstToData(const MCInst &Inst, const MCSubtargetInfo &) override;
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void emitXCOFFLocalCommonSymbol(MCSymbol *LabelSym, uint64_t Size,
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MCSymbol *CsectSym,
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unsigned ByteAlign) override;
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void emitXCOFFSymbolLinkageWithVisibility(MCSymbol *Symbol,
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MCSymbolAttr Linkage,
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MCSymbolAttr Visibility) override;
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};
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} // end namespace llvm
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#endif // LLVM_MC_MCXCOFFSTREAMER_H
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