diff options
Diffstat (limited to 'contrib/llvm/lib/MC/MCSymbolELF.cpp')
| -rw-r--r-- | contrib/llvm/lib/MC/MCSymbolELF.cpp | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/contrib/llvm/lib/MC/MCSymbolELF.cpp b/contrib/llvm/lib/MC/MCSymbolELF.cpp new file mode 100644 index 0000000..c362065 --- /dev/null +++ b/contrib/llvm/lib/MC/MCSymbolELF.cpp @@ -0,0 +1,213 @@ +//===- lib/MC/MCSymbolELF.cpp ---------------------------------------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// + +#include "llvm/MC/MCAssembler.h" +#include "llvm/MC/MCSymbolELF.h" +#include "llvm/MC/MCFixupKindInfo.h" +#include "llvm/Support/ELF.h" + +namespace llvm { + +namespace { +enum { + // Shift value for STT_* flags. 7 possible values. 3 bits. + ELF_STT_Shift = 0, + + // Shift value for STB_* flags. 4 possible values, 2 bits. + ELF_STB_Shift = 3, + + // Shift value for STV_* flags. 4 possible values, 2 bits. + ELF_STV_Shift = 5, + + // Shift value for STO_* flags. 3 bits. All the values are between 0x20 and + // 0xe0, so we shift right by 5 before storing. + ELF_STO_Shift = 7, + + // One bit. + ELF_IsSignature_Shift = 10, + + // One bit. + ELF_WeakrefUsedInReloc_Shift = 11, + + // One bit. + ELF_UsedInReloc_Shift = 12, + + // One bit. + ELF_BindingSet_Shift = 13 +}; +} + +void MCSymbolELF::setBinding(unsigned Binding) const { + setIsBindingSet(); + unsigned Val; + switch (Binding) { + default: + llvm_unreachable("Unsupported Binding"); + case ELF::STB_LOCAL: + Val = 0; + break; + case ELF::STB_GLOBAL: + Val = 1; + break; + case ELF::STB_WEAK: + Val = 2; + break; + case ELF::STB_GNU_UNIQUE: + Val = 3; + break; + } + uint32_t OtherFlags = getFlags() & ~(0x3 << ELF_STB_Shift); + setFlags(OtherFlags | (Val << ELF_STB_Shift)); +} + +unsigned MCSymbolELF::getBinding() const { + if (isBindingSet()) { + uint32_t Val = (getFlags() & (0x3 << ELF_STB_Shift)) >> ELF_STB_Shift; + switch (Val) { + default: + llvm_unreachable("Invalid value"); + case 0: + return ELF::STB_LOCAL; + case 1: + return ELF::STB_GLOBAL; + case 2: + return ELF::STB_WEAK; + case 3: + return ELF::STB_GNU_UNIQUE; + } + } + + if (isDefined()) + return ELF::STB_LOCAL; + if (isUsedInReloc()) + return ELF::STB_GLOBAL; + if (isWeakrefUsedInReloc()) + return ELF::STB_WEAK; + if (isSignature()) + return ELF::STB_LOCAL; + return ELF::STB_GLOBAL; +} + +void MCSymbolELF::setType(unsigned Type) const { + unsigned Val; + switch (Type) { + default: + llvm_unreachable("Unsupported Binding"); + case ELF::STT_NOTYPE: + Val = 0; + break; + case ELF::STT_OBJECT: + Val = 1; + break; + case ELF::STT_FUNC: + Val = 2; + break; + case ELF::STT_SECTION: + Val = 3; + break; + case ELF::STT_COMMON: + Val = 4; + break; + case ELF::STT_TLS: + Val = 5; + break; + case ELF::STT_GNU_IFUNC: + Val = 6; + break; + } + uint32_t OtherFlags = getFlags() & ~(0x7 << ELF_STT_Shift); + setFlags(OtherFlags | (Val << ELF_STT_Shift)); +} + +unsigned MCSymbolELF::getType() const { + uint32_t Val = (getFlags() & (0x7 << ELF_STT_Shift)) >> ELF_STT_Shift; + switch (Val) { + default: + llvm_unreachable("Invalid value"); + case 0: + return ELF::STT_NOTYPE; + case 1: + return ELF::STT_OBJECT; + case 2: + return ELF::STT_FUNC; + case 3: + return ELF::STT_SECTION; + case 4: + return ELF::STT_COMMON; + case 5: + return ELF::STT_TLS; + case 6: + return ELF::STT_GNU_IFUNC; + } +} + +void MCSymbolELF::setVisibility(unsigned Visibility) { + assert(Visibility == ELF::STV_DEFAULT || Visibility == ELF::STV_INTERNAL || + Visibility == ELF::STV_HIDDEN || Visibility == ELF::STV_PROTECTED); + + uint32_t OtherFlags = getFlags() & ~(0x3 << ELF_STV_Shift); + setFlags(OtherFlags | (Visibility << ELF_STV_Shift)); +} + +unsigned MCSymbolELF::getVisibility() const { + unsigned Visibility = (getFlags() & (0x3 << ELF_STV_Shift)) >> ELF_STV_Shift; + assert(Visibility == ELF::STV_DEFAULT || Visibility == ELF::STV_INTERNAL || + Visibility == ELF::STV_HIDDEN || Visibility == ELF::STV_PROTECTED); + return Visibility; +} + +void MCSymbolELF::setOther(unsigned Other) { + assert((Other & 0x1f) == 0); + Other >>= 5; + assert(Other <= 0x7); + uint32_t OtherFlags = getFlags() & ~(0x7 << ELF_STO_Shift); + setFlags(OtherFlags | (Other << ELF_STO_Shift)); +} + +unsigned MCSymbolELF::getOther() const { + unsigned Other = (getFlags() & (0x7 << ELF_STO_Shift)) >> ELF_STO_Shift; + return Other << 5; +} + +void MCSymbolELF::setUsedInReloc() const { + uint32_t OtherFlags = getFlags() & ~(0x1 << ELF_UsedInReloc_Shift); + setFlags(OtherFlags | (1 << ELF_UsedInReloc_Shift)); +} + +bool MCSymbolELF::isUsedInReloc() const { + return getFlags() & (0x1 << ELF_UsedInReloc_Shift); +} + +void MCSymbolELF::setIsWeakrefUsedInReloc() const { + uint32_t OtherFlags = getFlags() & ~(0x1 << ELF_WeakrefUsedInReloc_Shift); + setFlags(OtherFlags | (1 << ELF_WeakrefUsedInReloc_Shift)); +} + +bool MCSymbolELF::isWeakrefUsedInReloc() const { + return getFlags() & (0x1 << ELF_WeakrefUsedInReloc_Shift); +} + +void MCSymbolELF::setIsSignature() const { + uint32_t OtherFlags = getFlags() & ~(0x1 << ELF_IsSignature_Shift); + setFlags(OtherFlags | (1 << ELF_IsSignature_Shift)); +} + +bool MCSymbolELF::isSignature() const { + return getFlags() & (0x1 << ELF_IsSignature_Shift); +} + +void MCSymbolELF::setIsBindingSet() const { + uint32_t OtherFlags = getFlags() & ~(0x1 << ELF_BindingSet_Shift); + setFlags(OtherFlags | (1 << ELF_BindingSet_Shift)); +} + +bool MCSymbolELF::isBindingSet() const { + return getFlags() & (0x1 << ELF_BindingSet_Shift); +} +} |
