MCELF.cpp revision 36b56886974eae4f9c5ebc96befd3e7bfe5de338 
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
20namespace llvm {
21
22void 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
29unsigned 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
36void 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_COMMON || Type == ELF::STT_TLS ||
40         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
46unsigned 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_COMMON || Type == ELF::STT_TLS || Type == ELF::STT_GNU_IFUNC);
51  return Type;
52}
53
54// Visibility is stored in the first two bits of st_other
55// st_other values are stored in the second byte of get/setFlags
56void MCELF::SetVisibility(MCSymbolData &SD, unsigned Visibility) {
57  assert(Visibility == ELF::STV_DEFAULT || Visibility == ELF::STV_INTERNAL ||
58         Visibility == ELF::STV_HIDDEN || Visibility == ELF::STV_PROTECTED);
59
60  uint32_t OtherFlags = SD.getFlags() & ~(0x3 << ELF_STV_Shift);
61  SD.setFlags(OtherFlags | (Visibility << ELF_STV_Shift));
62}
63
64unsigned MCELF::GetVisibility(MCSymbolData &SD) {
65  unsigned Visibility =
66    (SD.getFlags() & (0x3 << ELF_STV_Shift)) >> ELF_STV_Shift;
67  assert(Visibility == ELF::STV_DEFAULT || Visibility == ELF::STV_INTERNAL ||
68         Visibility == ELF::STV_HIDDEN || Visibility == ELF::STV_PROTECTED);
69  return Visibility;
70}
71
72// Other is stored in the last six bits of st_other
73// st_other values are stored in the second byte of get/setFlags
74void MCELF::setOther(MCSymbolData &SD, unsigned Other) {
75  uint32_t OtherFlags = SD.getFlags() & ~(0x3f << ELF_STO_Shift);
76  SD.setFlags(OtherFlags | (Other << ELF_STO_Shift));
77}
78
79unsigned MCELF::getOther(MCSymbolData &SD) {
80  unsigned Other =
81    (SD.getFlags() & (0x3f << ELF_STO_Shift)) >> ELF_STO_Shift;
82  return Other;
83}
84
85}
86