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llvm-project/llvm/lib/MC/MCContext.cpp

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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/BinaryFormat/XCOFF.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/MCSectionXCOFF.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/MCSymbolXCOFF.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/Path.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,
MCTargetOptions const *TargetOpts, bool DoAutoReset)
: SrcMgr(mgr), InlineSrcMgr(nullptr), MAI(mai), MRI(mri), MOFI(mofi),
Symbols(Allocator), UsedNames(Allocator),
InlineAsmUsedLabelNames(Allocator),
CurrentDwarfLoc(0, 0, 0, DWARF2_FLAG_IS_STMT, 0, 0),
AutoReset(DoAutoReset), TargetOptions(TargetOpts) {
SecureLogFile = AsSecureLogFileName;
if (SrcMgr && SrcMgr->getNumBuffers())
MainFileName = std::string(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();
XCOFFAllocator.DestroyAll();
MCSubtargetAllocator.DestroyAll();
InlineAsmUsedLabelNames.clear();
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();
XCOFFUniquingMap.clear();
ELFEntrySizeMap.clear();
ELFSeenGenericMergeableSections.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) {
static_assert(std::is_trivially_destructible<MCSymbolCOFF>(),
"MCSymbol classes must be trivially destructible");
static_assert(std::is_trivially_destructible<MCSymbolELF>(),
"MCSymbol classes must be trivially destructible");
static_assert(std::is_trivially_destructible<MCSymbolMachO>(),
"MCSymbol classes must be trivially destructible");
static_assert(std::is_trivially_destructible<MCSymbolWasm>(),
"MCSymbol classes must be trivially destructible");
static_assert(std::is_trivially_destructible<MCSymbolXCOFF>(),
"MCSymbol classes must be trivially destructible");
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);
case MCObjectFileInfo::IsXCOFF:
return new (Name, *this) MCSymbolXCOFF(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));
}
void MCContext::registerInlineAsmLabel(MCSymbol *Sym) {
InlineAsmUsedLabelNames[Sym->getName()] = Sym;
}
//===----------------------------------------------------------------------===//
// 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.
assert(Section.size() <= 16 && "section name is too long");
assert(!memchr(Section.data(), '\0', Section.size()) &&
"section name cannot contain NUL");
// Do the lookup, if we have a hit, return it.
auto R = MachOUniquingMap.try_emplace((Segment + Twine(',') + Section).str());
if (!R.second)
return R.first->second;
MCSymbol *Begin = nullptr;
if (BeginSymName)
Begin = createTempSymbol(BeginSymName, false);
// Otherwise, return a new section.
StringRef Name = R.first->first();
R.first->second = new (MachOAllocator.Allocate())
MCSectionMachO(Segment, Name.substr(Name.size() - Section.size()),
TypeAndAttributes, Reserved2, Kind, Begin);
return R.first->second;
}
void MCContext::renameELFSection(MCSectionELF *Section, StringRef Name) {
StringRef GroupName;
if (const MCSymbol *Group = Section->getGroup())
GroupName = Group->getName();
// This function is only used by .debug*, which should not have the
// SHF_LINK_ORDER flag.
unsigned UniqueID = Section->getUniqueID();
ELFUniquingMap.erase(
ELFSectionKey{Section->getName(), 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 *LinkedToSym) {
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, LinkedToSym);
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 *LinkedToSym) {
MCSymbolELF *GroupSym = nullptr;
if (!Group.isTriviallyEmpty() && !Group.str().empty())
GroupSym = cast<MCSymbolELF>(getOrCreateSymbol(Group));
return getELFSection(Section, Type, Flags, EntrySize, GroupSym, UniqueID,
LinkedToSym);
}
MCSectionELF *MCContext::getELFSection(const Twine &Section, unsigned Type,
unsigned Flags, unsigned EntrySize,
const MCSymbolELF *GroupSym,
unsigned UniqueID,
const MCSymbolELF *LinkedToSym) {
StringRef Group = "";
if (GroupSym)
Group = GroupSym->getName();
assert(!(LinkedToSym && LinkedToSym->getName().empty()));
// Do the lookup, if we have a hit, return it.
auto IterBool = ELFUniquingMap.insert(std::make_pair(
ELFSectionKey{Section.str(), Group,
LinkedToSym ? LinkedToSym->getName() : "", 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, LinkedToSym);
Entry.second = Result;
recordELFMergeableSectionInfo(Result->getName(), Result->getFlags(),
Result->getUniqueID(), Result->getEntrySize());
return Result;
}
MCSectionELF *MCContext::createELFGroupSection(const MCSymbolELF *Group) {
return createELFSectionImpl(".group", ELF::SHT_GROUP, 0,
SectionKind::getReadOnly(), 4, Group,
MCSection::NonUniqueID, nullptr);
}
void MCContext::recordELFMergeableSectionInfo(StringRef SectionName,
unsigned Flags, unsigned UniqueID,
unsigned EntrySize) {
bool IsMergeable = Flags & ELF::SHF_MERGE;
if (IsMergeable && (UniqueID == GenericSectionID))
ELFSeenGenericMergeableSections.insert(SectionName);
// For mergeable sections or non-mergeable sections with a generic mergeable
// section name we enter their Unique ID into the ELFEntrySizeMap so that
// compatible globals can be assigned to the same section.
if (IsMergeable || isELFGenericMergeableSection(SectionName)) {
ELFEntrySizeMap.insert(std::make_pair(
ELFEntrySizeKey{SectionName, Flags, EntrySize}, UniqueID));
}
}
bool MCContext::isELFImplicitMergeableSectionNamePrefix(StringRef SectionName) {
return SectionName.startswith(".rodata.str") ||
SectionName.startswith(".rodata.cst");
}
bool MCContext::isELFGenericMergeableSection(StringRef SectionName) {
return isELFImplicitMergeableSectionNamePrefix(SectionName) ||
ELFSeenGenericMergeableSections.count(SectionName);
}
Optional<unsigned> MCContext::getELFUniqueIDForEntsize(StringRef SectionName,
unsigned Flags,
unsigned EntrySize) {
auto I = ELFEntrySizeMap.find(
MCContext::ELFEntrySizeKey{SectionName, Flags, EntrySize});
return (I != ELFEntrySizeMap.end()) ? Optional<unsigned>(I->second) : None;
}
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::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->getName(), Characteristics, Sec->getKind(),
KeySym->getName(),
COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE, UniqueID);
}
return getCOFFSection(Sec->getName(), 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;
}
MCSectionXCOFF *MCContext::getXCOFFSection(StringRef Section,
XCOFF::StorageMappingClass SMC,
XCOFF::SymbolType Type,
XCOFF::StorageClass SC,
SectionKind Kind,
const char *BeginSymName) {
// Do the lookup. If we have a hit, return it.
auto IterBool = XCOFFUniquingMap.insert(
std::make_pair(XCOFFSectionKey{Section.str(), SMC}, nullptr));
auto &Entry = *IterBool.first;
if (!IterBool.second)
return Entry.second;
// Otherwise, return a new section.
StringRef CachedName = Entry.first.SectionName;
MCSymbol *QualName = getOrCreateSymbol(
CachedName + "[" + XCOFF::getMappingClassString(SMC) + "]");
MCSymbol *Begin = nullptr;
if (BeginSymName)
Begin = createTempSymbol(BeginSymName, false);
MCSectionXCOFF *Result = new (XCOFFAllocator.Allocate()) MCSectionXCOFF(
CachedName, SMC, Type, SC, Kind, cast<MCSymbolXCOFF>(QualName), Begin);
Entry.second = Result;
auto *F = new MCDataFragment();
Result->getFragmentList().insert(Result->begin(), F);
F->setParent(Result);
if (Begin)
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;
if (DebugPrefixMap.empty())
return;
const auto RemapDebugPath = [&DebugPrefixMap](std::string &Path) {
SmallString<256> P(Path);
for (const auto &Entry : DebugPrefixMap) {
if (llvm::sys::path::replace_path_prefix(P, Entry.first, Entry.second)) {
Path = P.str().str();
break;
}
}
};
// Remap compilation directory.
std::string CompDir = std::string(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
//===----------------------------------------------------------------------===//
void MCContext::setGenDwarfRootFile(StringRef InputFileName, StringRef Buffer) {
// MCDwarf needs the root file as well as the compilation directory.
// If we find a '.file 0' directive that will supersede these values.
Optional<MD5::MD5Result> Cksum;
if (getDwarfVersion() >= 5) {
MD5 Hash;
MD5::MD5Result Sum;
Hash.update(Buffer);
Hash.final(Sum);
Cksum = Sum;
}
// Canonicalize the root filename. It cannot be empty, and should not
// repeat the compilation dir.
// The MCContext ctor initializes MainFileName to the name associated with
// the SrcMgr's main file ID, which might be the same as InputFileName (and
// possibly include directory components).
// Or, MainFileName might have been overridden by a -main-file-name option,
// which is supposed to be just a base filename with no directory component.
// So, if the InputFileName and MainFileName are not equal, assume
// MainFileName is a substitute basename and replace the last component.
SmallString<1024> FileNameBuf = InputFileName;
if (FileNameBuf.empty() || FileNameBuf == "-")
FileNameBuf = "<stdin>";
if (!getMainFileName().empty() && FileNameBuf != getMainFileName()) {
llvm::sys::path::remove_filename(FileNameBuf);
llvm::sys::path::append(FileNameBuf, getMainFileName());
}
StringRef FileName = FileNameBuf;
if (FileName.consume_front(getCompilationDir()))
if (llvm::sys::path::is_separator(FileName.front()))
FileName = FileName.drop_front();
assert(!FileName.empty());
setMCLineTableRootFile(
/*CUID=*/0, getCompilationDir(), FileName, Cksum, None);
}
/// 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,
Optional<MD5::MD5Result> Checksum,
Optional<StringRef> Source,
unsigned CUID) {
MCDwarfLineTable &Table = MCDwarfLineTablesCUMap[CUID];
return Table.tryGetFile(Directory, FileName, Checksum, Source, DwarfVersion,
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;
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::reportWarning(SMLoc Loc, const Twine &Msg) {
if (TargetOptions && TargetOptions->MCNoWarn)
return;
if (TargetOptions && TargetOptions->MCFatalWarnings)
reportError(Loc, Msg);
else {
// If we have a source manager use it. Otherwise, try using the inline
// source manager.
if (SrcMgr)
SrcMgr->PrintMessage(Loc, SourceMgr::DK_Warning, Msg);
else if (InlineSrcMgr)
InlineSrcMgr->PrintMessage(Loc, SourceMgr::DK_Warning, Msg);
}
}
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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