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c2996594d9
excluding visibility bits. Generic STO handling at the Target level. The st_other field of the ELF symbol table is one byte in size. The first 2 bytes are used for generic visibility and are currently handled by llvm. The other six bits are processor specific and need to be set at the target level. A couple of notes: The new static methods for accessing and setting the "other" flags in include/llvm/MC/MCELF.h match the style guide and not the other methods in the file. I don't like the inconsistency, but feel I should follow the prescribed lowerUpper() convention. STO_ value definitions are not specified in gnu land as consistently as the STT_ and STB_ fields. Probably because the latter were defined in a standards doc and the former defined partially in code. I have stuck with the full byte definition of the flags. Contributer: Zoran Jovanovic llvm-svn: 175561
87 lines
3.2 KiB
C++
87 lines
3.2 KiB
C++
//===- lib/MC/MCELF.cpp - MC ELF ------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements ELF object file writer information.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/MC/MCELF.h"
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#include "llvm/MC/MCAssembler.h"
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#include "llvm/MC/MCELFSymbolFlags.h"
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#include "llvm/MC/MCFixupKindInfo.h"
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#include "llvm/Support/ELF.h"
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namespace llvm {
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void MCELF::SetBinding(MCSymbolData &SD, unsigned Binding) {
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assert(Binding == ELF::STB_LOCAL || Binding == ELF::STB_GLOBAL ||
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Binding == ELF::STB_WEAK);
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uint32_t OtherFlags = SD.getFlags() & ~(0xf << ELF_STB_Shift);
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SD.setFlags(OtherFlags | (Binding << ELF_STB_Shift));
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}
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unsigned MCELF::GetBinding(const MCSymbolData &SD) {
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uint32_t Binding = (SD.getFlags() & (0xf << ELF_STB_Shift)) >> ELF_STB_Shift;
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assert(Binding == ELF::STB_LOCAL || Binding == ELF::STB_GLOBAL ||
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Binding == ELF::STB_WEAK);
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return Binding;
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}
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void MCELF::SetType(MCSymbolData &SD, unsigned Type) {
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assert(Type == ELF::STT_NOTYPE || Type == ELF::STT_OBJECT ||
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Type == ELF::STT_FUNC || Type == ELF::STT_SECTION ||
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Type == ELF::STT_FILE || Type == ELF::STT_COMMON ||
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Type == ELF::STT_TLS || Type == ELF::STT_GNU_IFUNC);
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uint32_t OtherFlags = SD.getFlags() & ~(0xf << ELF_STT_Shift);
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SD.setFlags(OtherFlags | (Type << ELF_STT_Shift));
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}
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unsigned MCELF::GetType(const MCSymbolData &SD) {
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uint32_t Type = (SD.getFlags() & (0xf << ELF_STT_Shift)) >> ELF_STT_Shift;
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assert(Type == ELF::STT_NOTYPE || Type == ELF::STT_OBJECT ||
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Type == ELF::STT_FUNC || Type == ELF::STT_SECTION ||
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Type == ELF::STT_FILE || Type == ELF::STT_COMMON ||
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Type == ELF::STT_TLS || Type == ELF::STT_GNU_IFUNC);
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return Type;
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}
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// Visibility is stored in the first two bits of st_other
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// st_other values are stored in the second byte of get/setFlags
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void MCELF::SetVisibility(MCSymbolData &SD, unsigned Visibility) {
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assert(Visibility == ELF::STV_DEFAULT || Visibility == ELF::STV_INTERNAL ||
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Visibility == ELF::STV_HIDDEN || Visibility == ELF::STV_PROTECTED);
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uint32_t OtherFlags = SD.getFlags() & ~(0x3 << ELF_STV_Shift);
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SD.setFlags(OtherFlags | (Visibility << ELF_STV_Shift));
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}
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unsigned MCELF::GetVisibility(MCSymbolData &SD) {
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unsigned Visibility =
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(SD.getFlags() & (0x3 << ELF_STV_Shift)) >> ELF_STV_Shift;
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assert(Visibility == ELF::STV_DEFAULT || Visibility == ELF::STV_INTERNAL ||
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Visibility == ELF::STV_HIDDEN || Visibility == ELF::STV_PROTECTED);
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return Visibility;
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}
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// Other is stored in the last six bits of st_other
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// st_other values are stored in the second byte of get/setFlags
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void MCELF::setOther(MCSymbolData &SD, unsigned Other) {
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uint32_t OtherFlags = SD.getFlags() & ~(0x3f << ELF_Other_Shift);
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SD.setFlags(OtherFlags | (Other << ELF_Other_Shift));
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}
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unsigned MCELF::getOther(MCSymbolData &SD) {
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unsigned Other =
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(SD.getFlags() & (0x3f << ELF_Other_Shift)) >> ELF_Other_Shift;
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return Other;
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}
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}
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