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      1 //===- lib/MC/MCELF.cpp - MC ELF ------------------------------------------===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is distributed under the University of Illinois Open Source
      6 // License. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 //
     10 // This file implements ELF object file writer information.
     11 //
     12 //===----------------------------------------------------------------------===//
     13 
     14 #include "llvm/MC/MCELF.h"
     15 #include "llvm/MC/MCAssembler.h"
     16 #include "llvm/MC/MCELFSymbolFlags.h"
     17 #include "llvm/MC/MCFixupKindInfo.h"
     18 #include "llvm/Support/ELF.h"
     19 
     20 namespace llvm {
     21 
     22 void MCELF::SetBinding(MCSymbolData &SD, unsigned Binding) {
     23   assert(Binding == ELF::STB_LOCAL || Binding == ELF::STB_GLOBAL ||
     24          Binding == ELF::STB_WEAK);
     25   uint32_t OtherFlags = SD.getFlags() & ~(0xf << ELF_STB_Shift);
     26   SD.setFlags(OtherFlags | (Binding << ELF_STB_Shift));
     27 }
     28 
     29 unsigned MCELF::GetBinding(const MCSymbolData &SD) {
     30   uint32_t Binding = (SD.getFlags() & (0xf << ELF_STB_Shift)) >> ELF_STB_Shift;
     31   assert(Binding == ELF::STB_LOCAL || Binding == ELF::STB_GLOBAL ||
     32          Binding == ELF::STB_WEAK);
     33   return Binding;
     34 }
     35 
     36 void MCELF::SetType(MCSymbolData &SD, unsigned Type) {
     37   assert(Type == ELF::STT_NOTYPE || Type == ELF::STT_OBJECT ||
     38          Type == ELF::STT_FUNC || Type == ELF::STT_SECTION ||
     39          Type == ELF::STT_FILE || Type == ELF::STT_COMMON ||
     40          Type == ELF::STT_TLS || Type == ELF::STT_GNU_IFUNC);
     41 
     42   uint32_t OtherFlags = SD.getFlags() & ~(0xf << ELF_STT_Shift);
     43   SD.setFlags(OtherFlags | (Type << ELF_STT_Shift));
     44 }
     45 
     46 unsigned MCELF::GetType(const MCSymbolData &SD) {
     47   uint32_t Type = (SD.getFlags() & (0xf << ELF_STT_Shift)) >> ELF_STT_Shift;
     48   assert(Type == ELF::STT_NOTYPE || Type == ELF::STT_OBJECT ||
     49          Type == ELF::STT_FUNC || Type == ELF::STT_SECTION ||
     50          Type == ELF::STT_FILE || Type == ELF::STT_COMMON ||
     51          Type == ELF::STT_TLS || Type == ELF::STT_GNU_IFUNC);
     52   return Type;
     53 }
     54 
     55 // Visibility is stored in the first two bits of st_other
     56 // st_other values are stored in the second byte of get/setFlags
     57 void MCELF::SetVisibility(MCSymbolData &SD, unsigned Visibility) {
     58   assert(Visibility == ELF::STV_DEFAULT || Visibility == ELF::STV_INTERNAL ||
     59          Visibility == ELF::STV_HIDDEN || Visibility == ELF::STV_PROTECTED);
     60 
     61   uint32_t OtherFlags = SD.getFlags() & ~(0x3 << ELF_STV_Shift);
     62   SD.setFlags(OtherFlags | (Visibility << ELF_STV_Shift));
     63 }
     64 
     65 unsigned MCELF::GetVisibility(MCSymbolData &SD) {
     66   unsigned Visibility =
     67     (SD.getFlags() & (0x3 << ELF_STV_Shift)) >> ELF_STV_Shift;
     68   assert(Visibility == ELF::STV_DEFAULT || Visibility == ELF::STV_INTERNAL ||
     69          Visibility == ELF::STV_HIDDEN || Visibility == ELF::STV_PROTECTED);
     70   return Visibility;
     71 }
     72 
     73 // Other is stored in the last six bits of st_other
     74 // st_other values are stored in the second byte of get/setFlags
     75 void MCELF::setOther(MCSymbolData &SD, unsigned Other) {
     76   uint32_t OtherFlags = SD.getFlags() & ~(0x3f << ELF_Other_Shift);
     77   SD.setFlags(OtherFlags | (Other << ELF_Other_Shift));
     78 }
     79 
     80 unsigned MCELF::getOther(MCSymbolData &SD) {
     81   unsigned Other =
     82     (SD.getFlags() & (0x3f << ELF_Other_Shift)) >> ELF_Other_Shift;
     83   return Other;
     84 }
     85 
     86 }
     87