forked from OSchip/llvm-project
357 lines
12 KiB
C++
357 lines
12 KiB
C++
//===- lib/MC/MCContext.cpp - Machine Code Context ------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/MC/MCContext.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCDwarf.h"
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#include "llvm/MC/MCLabel.h"
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#include "llvm/MC/MCObjectFileInfo.h"
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#include "llvm/MC/MCRegisterInfo.h"
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#include "llvm/MC/MCSectionCOFF.h"
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#include "llvm/MC/MCSectionELF.h"
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#include "llvm/MC/MCSectionMachO.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/Support/ELF.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/Signals.h"
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#include "llvm/Support/SourceMgr.h"
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#include <map>
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using namespace llvm;
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MCContext::MCContext(const MCAsmInfo *mai, const MCRegisterInfo *mri,
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const MCObjectFileInfo *mofi, const SourceMgr *mgr,
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bool DoAutoReset)
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: SrcMgr(mgr), MAI(mai), MRI(mri), MOFI(mofi), Allocator(),
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Symbols(Allocator), UsedNames(Allocator), NextUniqueID(0),
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CurrentDwarfLoc(0, 0, 0, DWARF2_FLAG_IS_STMT, 0, 0), DwarfLocSeen(false),
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GenDwarfForAssembly(false), GenDwarfFileNumber(0), DwarfVersion(4),
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AllowTemporaryLabels(true), DwarfCompileUnitID(0),
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AutoReset(DoAutoReset) {
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error_code EC = llvm::sys::fs::current_path(CompilationDir);
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if (EC)
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CompilationDir.clear();
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SecureLogFile = getenv("AS_SECURE_LOG_FILE");
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SecureLog = nullptr;
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SecureLogUsed = false;
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if (SrcMgr && SrcMgr->getNumBuffers() > 0)
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MainFileName = SrcMgr->getMemoryBuffer(0)->getBufferIdentifier();
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}
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MCContext::~MCContext() {
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if (AutoReset)
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reset();
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// NOTE: The symbols are all allocated out of a bump pointer allocator,
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// we don't need to free them here.
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// If the stream for the .secure_log_unique directive was created free it.
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delete (raw_ostream*)SecureLog;
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}
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//===----------------------------------------------------------------------===//
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// Module Lifetime Management
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//===----------------------------------------------------------------------===//
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void MCContext::reset() {
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UsedNames.clear();
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Symbols.clear();
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Allocator.Reset();
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Instances.clear();
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MCDwarfLineTablesCUMap.clear();
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MCGenDwarfLabelEntries.clear();
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DwarfDebugFlags = StringRef();
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DwarfCompileUnitID = 0;
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CurrentDwarfLoc = MCDwarfLoc(0,0,0,DWARF2_FLAG_IS_STMT,0,0);
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MachOUniquingMap.clear();
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ELFUniquingMap.clear();
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COFFUniquingMap.clear();
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NextUniqueID = 0;
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AllowTemporaryLabels = true;
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DwarfLocSeen = false;
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GenDwarfForAssembly = false;
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GenDwarfFileNumber = 0;
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}
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//===----------------------------------------------------------------------===//
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// Symbol Manipulation
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//===----------------------------------------------------------------------===//
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MCSymbol *MCContext::GetOrCreateSymbol(StringRef Name) {
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assert(!Name.empty() && "Normal symbols cannot be unnamed!");
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// Do the lookup and get the entire StringMapEntry. We want access to the
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// key if we are creating the entry.
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StringMapEntry<MCSymbol*> &Entry = Symbols.GetOrCreateValue(Name);
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MCSymbol *Sym = Entry.getValue();
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if (Sym)
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return Sym;
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Sym = CreateSymbol(Name);
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Entry.setValue(Sym);
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return Sym;
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}
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MCSymbol *MCContext::CreateSymbol(StringRef Name) {
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// Determine whether this is an assembler temporary or normal label, if used.
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bool isTemporary = false;
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if (AllowTemporaryLabels)
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isTemporary = Name.startswith(MAI->getPrivateGlobalPrefix());
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StringMapEntry<bool> *NameEntry = &UsedNames.GetOrCreateValue(Name);
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if (NameEntry->getValue()) {
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assert(isTemporary && "Cannot rename non-temporary symbols");
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SmallString<128> NewName = Name;
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do {
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NewName.resize(Name.size());
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raw_svector_ostream(NewName) << NextUniqueID++;
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NameEntry = &UsedNames.GetOrCreateValue(NewName);
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} while (NameEntry->getValue());
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}
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NameEntry->setValue(true);
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// Ok, the entry doesn't already exist. Have the MCSymbol object itself refer
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// to the copy of the string that is embedded in the UsedNames entry.
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MCSymbol *Result = new (*this) MCSymbol(NameEntry->getKey(), isTemporary);
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return Result;
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}
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MCSymbol *MCContext::GetOrCreateSymbol(const Twine &Name) {
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SmallString<128> NameSV;
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return GetOrCreateSymbol(Name.toStringRef(NameSV));
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}
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MCSymbol *MCContext::CreateLinkerPrivateTempSymbol() {
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SmallString<128> NameSV;
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raw_svector_ostream(NameSV)
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<< MAI->getLinkerPrivateGlobalPrefix() << "tmp" << NextUniqueID++;
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return CreateSymbol(NameSV);
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}
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MCSymbol *MCContext::CreateTempSymbol() {
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SmallString<128> NameSV;
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raw_svector_ostream(NameSV)
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<< MAI->getPrivateGlobalPrefix() << "tmp" << NextUniqueID++;
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return CreateSymbol(NameSV);
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}
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unsigned MCContext::NextInstance(unsigned LocalLabelVal) {
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MCLabel *&Label = Instances[LocalLabelVal];
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if (!Label)
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Label = new (*this) MCLabel(0);
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return Label->incInstance();
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}
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unsigned MCContext::GetInstance(unsigned LocalLabelVal) {
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MCLabel *&Label = Instances[LocalLabelVal];
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if (!Label)
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Label = new (*this) MCLabel(0);
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return Label->getInstance();
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}
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MCSymbol *MCContext::getOrCreateDirectionalLocalSymbol(unsigned LocalLabelVal,
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unsigned Instance) {
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MCSymbol *&Sym = LocalSymbols[std::make_pair(LocalLabelVal, Instance)];
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if (!Sym)
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Sym = CreateTempSymbol();
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return Sym;
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}
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MCSymbol *MCContext::CreateDirectionalLocalSymbol(unsigned LocalLabelVal) {
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unsigned Instance = NextInstance(LocalLabelVal);
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return getOrCreateDirectionalLocalSymbol(LocalLabelVal, Instance);
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}
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MCSymbol *MCContext::GetDirectionalLocalSymbol(unsigned LocalLabelVal,
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bool Before) {
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unsigned Instance = GetInstance(LocalLabelVal);
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if (!Before)
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++Instance;
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return getOrCreateDirectionalLocalSymbol(LocalLabelVal, Instance);
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}
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MCSymbol *MCContext::LookupSymbol(StringRef Name) const {
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return Symbols.lookup(Name);
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}
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MCSymbol *MCContext::LookupSymbol(const Twine &Name) const {
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SmallString<128> NameSV;
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Name.toVector(NameSV);
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return LookupSymbol(NameSV.str());
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}
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//===----------------------------------------------------------------------===//
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// Section Management
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//===----------------------------------------------------------------------===//
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const MCSectionMachO *MCContext::
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getMachOSection(StringRef Segment, StringRef Section,
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unsigned TypeAndAttributes,
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unsigned Reserved2, SectionKind Kind) {
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// We unique sections by their segment/section pair. The returned section
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// may not have the same flags as the requested section, if so this should be
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// diagnosed by the client as an error.
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// Form the name to look up.
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SmallString<64> Name;
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Name += Segment;
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Name.push_back(',');
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Name += Section;
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// Do the lookup, if we have a hit, return it.
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const MCSectionMachO *&Entry = MachOUniquingMap[Name.str()];
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if (Entry) return Entry;
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// Otherwise, return a new section.
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return Entry = new (*this) MCSectionMachO(Segment, Section, TypeAndAttributes,
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Reserved2, Kind);
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}
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const MCSectionELF *MCContext::
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getELFSection(StringRef Section, unsigned Type, unsigned Flags,
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SectionKind Kind) {
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return getELFSection(Section, Type, Flags, Kind, 0, "");
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}
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void MCContext::renameELFSection(const MCSectionELF *Section, StringRef Name) {
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StringRef GroupName;
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if (const MCSymbol *Group = Section->getGroup())
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GroupName = Group->getName();
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ELFUniquingMap.erase(SectionGroupPair(Section->getSectionName(), GroupName));
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auto I =
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ELFUniquingMap.insert(std::make_pair(SectionGroupPair(Name, GroupName),
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Section)).first;
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StringRef CachedName = I->first.first;
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const_cast<MCSectionELF*>(Section)->setSectionName(CachedName);
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}
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const MCSectionELF *MCContext::
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getELFSection(StringRef Section, unsigned Type, unsigned Flags,
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SectionKind Kind, unsigned EntrySize, StringRef Group) {
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// Do the lookup, if we have a hit, return it.
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auto IterBool = ELFUniquingMap.insert(
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std::make_pair(SectionGroupPair(Section, Group), nullptr));
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auto &Entry = *IterBool.first;
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if (!IterBool.second) return Entry.second;
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// Possibly refine the entry size first.
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if (!EntrySize) {
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EntrySize = MCSectionELF::DetermineEntrySize(Kind);
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}
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MCSymbol *GroupSym = nullptr;
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if (!Group.empty())
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GroupSym = GetOrCreateSymbol(Group);
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StringRef CachedName = Entry.first.first;
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MCSectionELF *Result = new (*this)
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MCSectionELF(CachedName, Type, Flags, Kind, EntrySize, GroupSym);
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Entry.second = Result;
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return Result;
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}
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const MCSectionELF *MCContext::CreateELFGroupSection() {
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MCSectionELF *Result =
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new (*this) MCSectionELF(".group", ELF::SHT_GROUP, 0,
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SectionKind::getReadOnly(), 4, nullptr);
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return Result;
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}
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const MCSectionCOFF *
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MCContext::getCOFFSection(StringRef Section, unsigned Characteristics,
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SectionKind Kind, StringRef COMDATSymName,
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int Selection, const MCSectionCOFF *Assoc) {
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// Do the lookup, if we have a hit, return it.
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SectionGroupPair P(Section, COMDATSymName);
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auto IterBool = COFFUniquingMap.insert(std::make_pair(P, nullptr));
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auto Iter = IterBool.first;
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if (!IterBool.second)
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return Iter->second;
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const MCSymbol *COMDATSymbol = nullptr;
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if (!COMDATSymName.empty())
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COMDATSymbol = GetOrCreateSymbol(COMDATSymName);
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StringRef CachedName = Iter->first.first;
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MCSectionCOFF *Result = new (*this) MCSectionCOFF(
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CachedName, Characteristics, COMDATSymbol, Selection, Assoc, Kind);
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Iter->second = Result;
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return Result;
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}
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const MCSectionCOFF *
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MCContext::getCOFFSection(StringRef Section, unsigned Characteristics,
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SectionKind Kind) {
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return getCOFFSection(Section, Characteristics, Kind, "", 0);
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}
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const MCSectionCOFF *MCContext::getCOFFSection(StringRef Section) {
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SectionGroupPair P(Section, "");
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auto Iter = COFFUniquingMap.find(P);
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if (Iter == COFFUniquingMap.end())
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return nullptr;
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return Iter->second;
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}
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//===----------------------------------------------------------------------===//
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// Dwarf Management
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//===----------------------------------------------------------------------===//
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/// GetDwarfFile - takes a file name an number to place in the dwarf file and
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/// directory tables. If the file number has already been allocated it is an
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/// error and zero is returned and the client reports the error, else the
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/// allocated file number is returned. The file numbers may be in any order.
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unsigned MCContext::GetDwarfFile(StringRef Directory, StringRef FileName,
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unsigned FileNumber, unsigned CUID) {
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MCDwarfLineTable &Table = MCDwarfLineTablesCUMap[CUID];
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return Table.getFile(Directory, FileName, FileNumber);
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}
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/// isValidDwarfFileNumber - takes a dwarf file number and returns true if it
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/// currently is assigned and false otherwise.
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bool MCContext::isValidDwarfFileNumber(unsigned FileNumber, unsigned CUID) {
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const SmallVectorImpl<MCDwarfFile>& MCDwarfFiles = getMCDwarfFiles(CUID);
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if(FileNumber == 0 || FileNumber >= MCDwarfFiles.size())
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return false;
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return !MCDwarfFiles[FileNumber].Name.empty();
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}
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void MCContext::FatalError(SMLoc Loc, const Twine &Msg) const {
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// If we have a source manager and a location, use it. Otherwise just
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// use the generic report_fatal_error().
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if (!SrcMgr || Loc == SMLoc())
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report_fatal_error(Msg, false);
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// Use the source manager to print the message.
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SrcMgr->PrintMessage(Loc, SourceMgr::DK_Error, Msg);
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// If we reached here, we are failing ungracefully. Run the interrupt handlers
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// to make sure any special cleanups get done, in particular that we remove
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// files registered with RemoveFileOnSignal.
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sys::RunInterruptHandlers();
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exit(1);
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}
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