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[mc] Fix ELF st_other flag.

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ELF_Other_Weakref and ELF_Other_ThumbFunc seems to be LLVM
internal ELF symbol flags.  These should not be emitted to
object file.

This commit defines ELF_STO_Shift for the target-defined
flags for st_other, and increase the value of
ELF_Other_Shift to 16.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@196440 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Logan Chien 2013-12-05 00:34:11 +00:00
parent faf4d59137
commit 175fe68393
4 changed files with 29 additions and 9 deletions
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10
include/llvm/MC/MCELFSymbolFlags.h
View File

@ -21,10 +21,12 @@
namespace llvm {
enum {
ELF_STT_Shift = 0, // Shift value for STT_* flags.
ELF_STB_Shift = 4, // Shift value for STB_* flags.
ELF_STV_Shift = 8, // Shift value for STV_* flags.
ELF_Other_Shift = 10 // Shift value for other flags.
ELF_STT_Shift = 0, // Shift value for STT_* flags.
ELF_STB_Shift = 4, // Shift value for STB_* flags.
ELF_STV_Shift = 8, // Shift value for STV_* flags.
ELF_STO_Shift = 10, // Shift value for STO_* flags.
ELF_Other_Shift = 16 // Shift value for llvm local flags,
// not part of the final object file
};
enum ELFSymbolFlags {

3
lib/MC/ELFObjectWriter.cpp
View File

@ -551,8 +551,7 @@ void ELFObjectWriter::WriteSymbol(MCDataFragment *SymtabF,
// Other and Visibility share the same byte with Visibility using the lower
// 2 bits
uint8_t Visibility = MCELF::GetVisibility(OrigData);
uint8_t Other = MCELF::getOther(OrigData) <<
(ELF_Other_Shift - ELF_STV_Shift);
uint8_t Other = MCELF::getOther(OrigData) << (ELF_STO_Shift - ELF_STV_Shift);
Other |= Visibility;
uint64_t Value = SymbolValue(Data, Layout);

6
lib/MC/MCELF.cpp
View File

@ -72,13 +72,13 @@ unsigned MCELF::GetVisibility(MCSymbolData &SD) {
// Other is stored in the last six bits of st_other
// st_other values are stored in the second byte of get/setFlags
void MCELF::setOther(MCSymbolData &SD, unsigned Other) {
uint32_t OtherFlags = SD.getFlags() & ~(0x3f << ELF_Other_Shift);
SD.setFlags(OtherFlags | (Other << ELF_Other_Shift));
uint32_t OtherFlags = SD.getFlags() & ~(0x3f << ELF_STO_Shift);
SD.setFlags(OtherFlags | (Other << ELF_STO_Shift));
}
unsigned MCELF::getOther(MCSymbolData &SD) {
unsigned Other =
(SD.getFlags() & (0x3f << ELF_Other_Shift)) >> ELF_Other_Shift;
(SD.getFlags() & (0x3f << ELF_STO_Shift)) >> ELF_STO_Shift;
return Other;
}

19
test/MC/ELF/thumb-st_other.s Normal file
View File

@ -0,0 +1,19 @@
@ Check the value of st_other for thumb function.
@ ARM does not define any st_other flags for thumb function. The value
@ for st_other should always be 0.
@ RUN: llvm-mc < %s -triple thumbv5-linux-gnueabi -filetype=obj -o - \
@ RUN: | llvm-readobj -t | FileCheck %s
.syntax unified
.text
.align 2
.thumb_func
.global main
.type main,%function
main:
bx lr
@ CHECK: Name: main
@ CHECK: Other: 0