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llvm-mirror/lib/MC/MCContext.cpp
Chandler Carruth ae65e281f3 Update the file headers across all of the LLVM projects in the monorepo 
to reflect the new license.

We understand that people may be surprised that we're moving the header
entirely to discuss the new license. We checked this carefully with the
Foundation's lawyer and we believe this is the correct approach.

Essentially, all code in the project is now made available by the LLVM
project under our new license, so you will see that the license headers
include that license only. Some of our contributors have contributed
code under our old license, and accordingly, we have retained a copy of
our old license notice in the top-level files in each project and
repository.

llvm-svn: 351636
2019-01-19 08:50:56 +00:00

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//===- lib/MC/MCContext.cpp - Machine Code Context ------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/MC/MCContext.h"
#include "llvm/ADT/Optional.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/Twine.h"
#include "llvm/BinaryFormat/COFF.h"
#include "llvm/BinaryFormat/ELF.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCCodeView.h"
#include "llvm/MC/MCDwarf.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCFragment.h"
#include "llvm/MC/MCLabel.h"
#include "llvm/MC/MCObjectFileInfo.h"
#include "llvm/MC/MCSectionCOFF.h"
#include "llvm/MC/MCSectionELF.h"
#include "llvm/MC/MCSectionMachO.h"
#include "llvm/MC/MCSectionWasm.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCSymbolCOFF.h"
#include "llvm/MC/MCSymbolELF.h"
#include "llvm/MC/MCSymbolMachO.h"
#include "llvm/MC/MCSymbolWasm.h"
#include "llvm/MC/SectionKind.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/raw_ostream.h"
#include <cassert>
#include <cstdlib>
#include <tuple>
#include <utility>
using namespace llvm;
static cl::opt<char*>
AsSecureLogFileName("as-secure-log-file-name",
cl::desc("As secure log file name (initialized from "
"AS_SECURE_LOG_FILE env variable)"),
cl::init(getenv("AS_SECURE_LOG_FILE")), cl::Hidden);
MCContext::MCContext(const MCAsmInfo *mai, const MCRegisterInfo *mri,
const MCObjectFileInfo *mofi, const SourceMgr *mgr,
bool DoAutoReset)
: SrcMgr(mgr), InlineSrcMgr(nullptr), MAI(mai), MRI(mri), MOFI(mofi),
Symbols(Allocator), UsedNames(Allocator),
CurrentDwarfLoc(0, 0, 0, DWARF2_FLAG_IS_STMT, 0, 0),
AutoReset(DoAutoReset) {
SecureLogFile = AsSecureLogFileName;
if (SrcMgr && SrcMgr->getNumBuffers())
MainFileName =
SrcMgr->getMemoryBuffer(SrcMgr->getMainFileID())->getBufferIdentifier();
}
MCContext::~MCContext() {
if (AutoReset)
reset();
// NOTE: The symbols are all allocated out of a bump pointer allocator,
// we don't need to free them here.
}
//===----------------------------------------------------------------------===//
// Module Lifetime Management
//===----------------------------------------------------------------------===//
void MCContext::reset() {
// Call the destructors so the fragments are freed
COFFAllocator.DestroyAll();
ELFAllocator.DestroyAll();
MachOAllocator.DestroyAll();
MCSubtargetAllocator.DestroyAll();
UsedNames.clear();
Symbols.clear();
Allocator.Reset();
Instances.clear();
CompilationDir.clear();
MainFileName.clear();
MCDwarfLineTablesCUMap.clear();
SectionsForRanges.clear();
MCGenDwarfLabelEntries.clear();
DwarfDebugFlags = StringRef();
DwarfCompileUnitID = 0;
CurrentDwarfLoc = MCDwarfLoc(0, 0, 0, DWARF2_FLAG_IS_STMT, 0, 0);
CVContext.reset();
MachOUniquingMap.clear();
ELFUniquingMap.clear();
COFFUniquingMap.clear();
WasmUniquingMap.clear();
NextID.clear();
AllowTemporaryLabels = true;
DwarfLocSeen = false;
GenDwarfForAssembly = false;
GenDwarfFileNumber = 0;
HadError = false;
}
//===----------------------------------------------------------------------===//
// Symbol Manipulation
//===----------------------------------------------------------------------===//
MCSymbol *MCContext::getOrCreateSymbol(const Twine &Name) {
SmallString<128> NameSV;
StringRef NameRef = Name.toStringRef(NameSV);
assert(!NameRef.empty() && "Normal symbols cannot be unnamed!");
MCSymbol *&Sym = Symbols[NameRef];
if (!Sym)
Sym = createSymbol(NameRef, false, false);
return Sym;
}
MCSymbol *MCContext::getOrCreateFrameAllocSymbol(StringRef FuncName,
unsigned Idx) {
return getOrCreateSymbol(Twine(MAI->getPrivateGlobalPrefix()) + FuncName +
"$frame_escape_" + Twine(Idx));
}
MCSymbol *MCContext::getOrCreateParentFrameOffsetSymbol(StringRef FuncName) {
return getOrCreateSymbol(Twine(MAI->getPrivateGlobalPrefix()) + FuncName +
"$parent_frame_offset");
}
MCSymbol *MCContext::getOrCreateLSDASymbol(StringRef FuncName) {
return getOrCreateSymbol(Twine(MAI->getPrivateGlobalPrefix()) + "__ehtable$" +
FuncName);
}
MCSymbol *MCContext::createSymbolImpl(const StringMapEntry<bool> *Name,
bool IsTemporary) {
if (MOFI) {
switch (MOFI->getObjectFileType()) {
case MCObjectFileInfo::IsCOFF:
return new (Name, *this) MCSymbolCOFF(Name, IsTemporary);
case MCObjectFileInfo::IsELF:
return new (Name, *this) MCSymbolELF(Name, IsTemporary);
case MCObjectFileInfo::IsMachO:
return new (Name, *this) MCSymbolMachO(Name, IsTemporary);
case MCObjectFileInfo::IsWasm:
return new (Name, *this) MCSymbolWasm(Name, IsTemporary);
}
}
return new (Name, *this) MCSymbol(MCSymbol::SymbolKindUnset, Name,
IsTemporary);
}
MCSymbol *MCContext::createSymbol(StringRef Name, bool AlwaysAddSuffix,
bool CanBeUnnamed) {
if (CanBeUnnamed && !UseNamesOnTempLabels)
return createSymbolImpl(nullptr, true);
// Determine whether this is a user written assembler temporary or normal
// label, if used.
bool IsTemporary = CanBeUnnamed;
if (AllowTemporaryLabels && !IsTemporary)
IsTemporary = Name.startswith(MAI->getPrivateGlobalPrefix());
SmallString<128> NewName = Name;
bool AddSuffix = AlwaysAddSuffix;
unsigned &NextUniqueID = NextID[Name];
while (true) {
if (AddSuffix) {
NewName.resize(Name.size());
raw_svector_ostream(NewName) << NextUniqueID++;
}
auto NameEntry = UsedNames.insert(std::make_pair(NewName, true));
if (NameEntry.second || !NameEntry.first->second) {
// Ok, we found a name.
// Mark it as used for a non-section symbol.
NameEntry.first->second = true;
// Have the MCSymbol object itself refer to the copy of the string that is
// embedded in the UsedNames entry.
return createSymbolImpl(&*NameEntry.first, IsTemporary);
}
assert(IsTemporary && "Cannot rename non-temporary symbols");
AddSuffix = true;
}
llvm_unreachable("Infinite loop");
}
MCSymbol *MCContext::createTempSymbol(const Twine &Name, bool AlwaysAddSuffix,
bool CanBeUnnamed) {
SmallString<128> NameSV;
raw_svector_ostream(NameSV) << MAI->getPrivateGlobalPrefix() << Name;
return createSymbol(NameSV, AlwaysAddSuffix, CanBeUnnamed);
}
MCSymbol *MCContext::createLinkerPrivateTempSymbol() {
SmallString<128> NameSV;
raw_svector_ostream(NameSV) << MAI->getLinkerPrivateGlobalPrefix() << "tmp";
return createSymbol(NameSV, true, false);
}
MCSymbol *MCContext::createTempSymbol(bool CanBeUnnamed) {
return createTempSymbol("tmp", true, CanBeUnnamed);
}
unsigned MCContext::NextInstance(unsigned LocalLabelVal) {
MCLabel *&Label = Instances[LocalLabelVal];
if (!Label)
Label = new (*this) MCLabel(0);
return Label->incInstance();
}
unsigned MCContext::GetInstance(unsigned LocalLabelVal) {
MCLabel *&Label = Instances[LocalLabelVal];
if (!Label)
Label = new (*this) MCLabel(0);
return Label->getInstance();
}
MCSymbol *MCContext::getOrCreateDirectionalLocalSymbol(unsigned LocalLabelVal,
unsigned Instance) {
MCSymbol *&Sym = LocalSymbols[std::make_pair(LocalLabelVal, Instance)];
if (!Sym)
Sym = createTempSymbol(false);
return Sym;
}
MCSymbol *MCContext::createDirectionalLocalSymbol(unsigned LocalLabelVal) {
unsigned Instance = NextInstance(LocalLabelVal);
return getOrCreateDirectionalLocalSymbol(LocalLabelVal, Instance);
}
MCSymbol *MCContext::getDirectionalLocalSymbol(unsigned LocalLabelVal,
bool Before) {
unsigned Instance = GetInstance(LocalLabelVal);
if (!Before)
++Instance;
return getOrCreateDirectionalLocalSymbol(LocalLabelVal, Instance);
}
MCSymbol *MCContext::lookupSymbol(const Twine &Name) const {
SmallString<128> NameSV;
StringRef NameRef = Name.toStringRef(NameSV);
return Symbols.lookup(NameRef);
}
void MCContext::setSymbolValue(MCStreamer &Streamer,
StringRef Sym,
uint64_t Val) {
auto Symbol = getOrCreateSymbol(Sym);
Streamer.EmitAssignment(Symbol, MCConstantExpr::create(Val, *this));
}
//===----------------------------------------------------------------------===//
// Section Management
//===----------------------------------------------------------------------===//
MCSectionMachO *MCContext::getMachOSection(StringRef Segment, StringRef Section,
unsigned TypeAndAttributes,
unsigned Reserved2, SectionKind Kind,
const char *BeginSymName) {
// We unique sections by their segment/section pair. The returned section
// may not have the same flags as the requested section, if so this should be
// diagnosed by the client as an error.
// Form the name to look up.
SmallString<64> Name;
Name += Segment;
Name.push_back(',');
Name += Section;
// Do the lookup, if we have a hit, return it.
MCSectionMachO *&Entry = MachOUniquingMap[Name];
if (Entry)
return Entry;
MCSymbol *Begin = nullptr;
if (BeginSymName)
Begin = createTempSymbol(BeginSymName, false);
// Otherwise, return a new section.
return Entry = new (MachOAllocator.Allocate()) MCSectionMachO(
Segment, Section, TypeAndAttributes, Reserved2, Kind, Begin);
}
void MCContext::renameELFSection(MCSectionELF *Section, StringRef Name) {
StringRef GroupName;
if (const MCSymbol *Group = Section->getGroup())
GroupName = Group->getName();
unsigned UniqueID = Section->getUniqueID();
ELFUniquingMap.erase(
ELFSectionKey{Section->getSectionName(), GroupName, UniqueID});
auto I = ELFUniquingMap.insert(std::make_pair(
ELFSectionKey{Name, GroupName, UniqueID},
Section))
.first;
StringRef CachedName = I->first.SectionName;
const_cast<MCSectionELF *>(Section)->setSectionName(CachedName);
}
MCSectionELF *MCContext::createELFSectionImpl(StringRef Section, unsigned Type,
unsigned Flags, SectionKind K,
unsigned EntrySize,
const MCSymbolELF *Group,
unsigned UniqueID,
const MCSymbolELF *Associated) {
MCSymbolELF *R;
MCSymbol *&Sym = Symbols[Section];
// A section symbol can not redefine regular symbols. There may be multiple
// sections with the same name, in which case the first such section wins.
if (Sym && Sym->isDefined() &&
(!Sym->isInSection() || Sym->getSection().getBeginSymbol() != Sym))
reportError(SMLoc(), "invalid symbol redefinition");
if (Sym && Sym->isUndefined()) {
R = cast<MCSymbolELF>(Sym);
} else {
auto NameIter = UsedNames.insert(std::make_pair(Section, false)).first;
R = new (&*NameIter, *this) MCSymbolELF(&*NameIter, /*isTemporary*/ false);
if (!Sym)
Sym = R;
}
R->setBinding(ELF::STB_LOCAL);
R->setType(ELF::STT_SECTION);
auto *Ret = new (ELFAllocator.Allocate()) MCSectionELF(
Section, Type, Flags, K, EntrySize, Group, UniqueID, R, Associated);
auto *F = new MCDataFragment();
Ret->getFragmentList().insert(Ret->begin(), F);
F->setParent(Ret);
R->setFragment(F);
return Ret;
}
MCSectionELF *MCContext::createELFRelSection(const Twine &Name, unsigned Type,
unsigned Flags, unsigned EntrySize,
const MCSymbolELF *Group,
const MCSectionELF *RelInfoSection) {
StringMap<bool>::iterator I;
bool Inserted;
std::tie(I, Inserted) =
RelSecNames.insert(std::make_pair(Name.str(), true));
return createELFSectionImpl(
I->getKey(), Type, Flags, SectionKind::getReadOnly(), EntrySize, Group,
true, cast<MCSymbolELF>(RelInfoSection->getBeginSymbol()));
}
MCSectionELF *MCContext::getELFNamedSection(const Twine &Prefix,
const Twine &Suffix, unsigned Type,
unsigned Flags,
unsigned EntrySize) {
return getELFSection(Prefix + "." + Suffix, Type, Flags, EntrySize, Suffix);
}
MCSectionELF *MCContext::getELFSection(const Twine &Section, unsigned Type,
unsigned Flags, unsigned EntrySize,
const Twine &Group, unsigned UniqueID,
const MCSymbolELF *Associated) {
MCSymbolELF *GroupSym = nullptr;
if (!Group.isTriviallyEmpty() && !Group.str().empty())
GroupSym = cast<MCSymbolELF>(getOrCreateSymbol(Group));
return getELFSection(Section, Type, Flags, EntrySize, GroupSym, UniqueID,
Associated);
}
MCSectionELF *MCContext::getELFSection(const Twine &Section, unsigned Type,
unsigned Flags, unsigned EntrySize,
const MCSymbolELF *GroupSym,
unsigned UniqueID,
const MCSymbolELF *Associated) {
StringRef Group = "";
if (GroupSym)
Group = GroupSym->getName();
// Do the lookup, if we have a hit, return it.
auto IterBool = ELFUniquingMap.insert(
std::make_pair(ELFSectionKey{Section.str(), Group, UniqueID}, nullptr));
auto &Entry = *IterBool.first;
if (!IterBool.second)
return Entry.second;
StringRef CachedName = Entry.first.SectionName;
SectionKind Kind;
if (Flags & ELF::SHF_ARM_PURECODE)
Kind = SectionKind::getExecuteOnly();
else if (Flags & ELF::SHF_EXECINSTR)
Kind = SectionKind::getText();
else
Kind = SectionKind::getReadOnly();
MCSectionELF *Result = createELFSectionImpl(
CachedName, Type, Flags, Kind, EntrySize, GroupSym, UniqueID, Associated);
Entry.second = Result;
return Result;
}
MCSectionELF *MCContext::createELFGroupSection(const MCSymbolELF *Group) {
return createELFSectionImpl(".group", ELF::SHT_GROUP, 0,
SectionKind::getReadOnly(), 4, Group, ~0,
nullptr);
}
MCSectionCOFF *MCContext::getCOFFSection(StringRef Section,
unsigned Characteristics,
SectionKind Kind,
StringRef COMDATSymName, int Selection,
unsigned UniqueID,
const char *BeginSymName) {
MCSymbol *COMDATSymbol = nullptr;
if (!COMDATSymName.empty()) {
COMDATSymbol = getOrCreateSymbol(COMDATSymName);
COMDATSymName = COMDATSymbol->getName();
}
// Do the lookup, if we have a hit, return it.
COFFSectionKey T{Section, COMDATSymName, Selection, UniqueID};
auto IterBool = COFFUniquingMap.insert(std::make_pair(T, nullptr));
auto Iter = IterBool.first;
if (!IterBool.second)
return Iter->second;
MCSymbol *Begin = nullptr;
if (BeginSymName)
Begin = createTempSymbol(BeginSymName, false);
StringRef CachedName = Iter->first.SectionName;
MCSectionCOFF *Result = new (COFFAllocator.Allocate()) MCSectionCOFF(
CachedName, Characteristics, COMDATSymbol, Selection, Kind, Begin);
Iter->second = Result;
return Result;
}
MCSectionCOFF *MCContext::getCOFFSection(StringRef Section,
unsigned Characteristics,
SectionKind Kind,
const char *BeginSymName) {
return getCOFFSection(Section, Characteristics, Kind, "", 0, GenericSectionID,
BeginSymName);
}
MCSectionCOFF *MCContext::getCOFFSection(StringRef Section) {
COFFSectionKey T{Section, "", 0, GenericSectionID};
auto Iter = COFFUniquingMap.find(T);
if (Iter == COFFUniquingMap.end())
return nullptr;
return Iter->second;
}
MCSectionCOFF *MCContext::getAssociativeCOFFSection(MCSectionCOFF *Sec,
const MCSymbol *KeySym,
unsigned UniqueID) {
// Return the normal section if we don't have to be associative or unique.
if (!KeySym && UniqueID == GenericSectionID)
return Sec;
// If we have a key symbol, make an associative section with the same name and
// kind as the normal section.
unsigned Characteristics = Sec->getCharacteristics();
if (KeySym) {
Characteristics |= COFF::IMAGE_SCN_LNK_COMDAT;
return getCOFFSection(Sec->getSectionName(), Characteristics,
Sec->getKind(), KeySym->getName(),
COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE, UniqueID);
}
return getCOFFSection(Sec->getSectionName(), Characteristics, Sec->getKind(),
"", 0, UniqueID);
}
MCSectionWasm *MCContext::getWasmSection(const Twine &Section, SectionKind K,
const Twine &Group, unsigned UniqueID,
const char *BeginSymName) {
MCSymbolWasm *GroupSym = nullptr;
if (!Group.isTriviallyEmpty() && !Group.str().empty()) {
GroupSym = cast<MCSymbolWasm>(getOrCreateSymbol(Group));
GroupSym->setComdat(true);
}
return getWasmSection(Section, K, GroupSym, UniqueID, BeginSymName);
}
MCSectionWasm *MCContext::getWasmSection(const Twine &Section, SectionKind Kind,
const MCSymbolWasm *GroupSym,
unsigned UniqueID,
const char *BeginSymName) {
StringRef Group = "";
if (GroupSym)
Group = GroupSym->getName();
// Do the lookup, if we have a hit, return it.
auto IterBool = WasmUniquingMap.insert(
std::make_pair(WasmSectionKey{Section.str(), Group, UniqueID}, nullptr));
auto &Entry = *IterBool.first;
if (!IterBool.second)
return Entry.second;
StringRef CachedName = Entry.first.SectionName;
MCSymbol *Begin = createSymbol(CachedName, false, false);
cast<MCSymbolWasm>(Begin)->setType(wasm::WASM_SYMBOL_TYPE_SECTION);
MCSectionWasm *Result = new (WasmAllocator.Allocate())
MCSectionWasm(CachedName, Kind, GroupSym, UniqueID, Begin);
Entry.second = Result;
auto *F = new MCDataFragment();
Result->getFragmentList().insert(Result->begin(), F);
F->setParent(Result);
Begin->setFragment(F);
return Result;
}
MCSubtargetInfo &MCContext::getSubtargetCopy(const MCSubtargetInfo &STI) {
return *new (MCSubtargetAllocator.Allocate()) MCSubtargetInfo(STI);
}
void MCContext::addDebugPrefixMapEntry(const std::string &From,
const std::string &To) {
DebugPrefixMap.insert(std::make_pair(From, To));
}
void MCContext::RemapDebugPaths() {
const auto &DebugPrefixMap = this->DebugPrefixMap;
const auto RemapDebugPath = [&DebugPrefixMap](std::string &Path) {
for (const auto &Entry : DebugPrefixMap)
if (StringRef(Path).startswith(Entry.first)) {
std::string RemappedPath =
(Twine(Entry.second) + Path.substr(Entry.first.size())).str();
Path.swap(RemappedPath);
}
};
// Remap compilation directory.
std::string CompDir = CompilationDir.str();
RemapDebugPath(CompDir);
CompilationDir = CompDir;
// Remap MCDwarfDirs in all compilation units.
for (auto &CUIDTablePair : MCDwarfLineTablesCUMap)
for (auto &Dir : CUIDTablePair.second.getMCDwarfDirs())
RemapDebugPath(Dir);
}
//===----------------------------------------------------------------------===//
// Dwarf Management
//===----------------------------------------------------------------------===//
/// getDwarfFile - takes a file name and number to place in the dwarf file and
/// directory tables. If the file number has already been allocated it is an
/// error and zero is returned and the client reports the error, else the
/// allocated file number is returned. The file numbers may be in any order.
Expected<unsigned> MCContext::getDwarfFile(StringRef Directory,
StringRef FileName,
unsigned FileNumber,
MD5::MD5Result *Checksum,
Optional<StringRef> Source,
unsigned CUID) {
MCDwarfLineTable &Table = MCDwarfLineTablesCUMap[CUID];
return Table.tryGetFile(Directory, FileName, Checksum, Source, FileNumber);
}
/// isValidDwarfFileNumber - takes a dwarf file number and returns true if it
/// currently is assigned and false otherwise.
bool MCContext::isValidDwarfFileNumber(unsigned FileNumber, unsigned CUID) {
const MCDwarfLineTable &LineTable = getMCDwarfLineTable(CUID);
if (FileNumber == 0)
return getDwarfVersion() >= 5 && LineTable.hasRootFile();
if (FileNumber >= LineTable.getMCDwarfFiles().size())
return false;
return !LineTable.getMCDwarfFiles()[FileNumber].Name.empty();
}
/// Remove empty sections from SectionsForRanges, to avoid generating
/// useless debug info for them.
void MCContext::finalizeDwarfSections(MCStreamer &MCOS) {
SectionsForRanges.remove_if(
[&](MCSection *Sec) { return !MCOS.mayHaveInstructions(*Sec); });
}
CodeViewContext &MCContext::getCVContext() {
if (!CVContext.get())
CVContext.reset(new CodeViewContext);
return *CVContext.get();
}
//===----------------------------------------------------------------------===//
// Error Reporting
//===----------------------------------------------------------------------===//
void MCContext::reportError(SMLoc Loc, const Twine &Msg) {
HadError = true;
// If we have a source manager use it. Otherwise, try using the inline source
// manager.
// If that fails, use the generic report_fatal_error().
if (SrcMgr)
SrcMgr->PrintMessage(Loc, SourceMgr::DK_Error, Msg);
else if (InlineSrcMgr)
InlineSrcMgr->PrintMessage(Loc, SourceMgr::DK_Error, Msg);
else
report_fatal_error(Msg, false);
}
void MCContext::reportFatalError(SMLoc Loc, const Twine &Msg) {
reportError(Loc, Msg);
// If we reached here, we are failing ungracefully. Run the interrupt handlers
// to make sure any special cleanups get done, in particular that we remove
// files registered with RemoveFileOnSignal.
sys::RunInterruptHandlers();
exit(1);
}
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