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283 lines
10 KiB
C++
283 lines
10 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/MC/MCAsmInfo.h"
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#include "llvm/MC/MCSectionMachO.h"
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#include "llvm/MC/MCSectionELF.h"
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#include "llvm/MC/MCSectionCOFF.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/MC/MCLabel.h"
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#include "llvm/MC/MCDwarf.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/Twine.h"
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using namespace llvm;
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typedef StringMap<const MCSectionMachO*> MachOUniqueMapTy;
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typedef StringMap<const MCSectionELF*> ELFUniqueMapTy;
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typedef StringMap<const MCSectionCOFF*> COFFUniqueMapTy;
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MCContext::MCContext(const MCAsmInfo &mai) : MAI(mai), NextUniqueID(0),
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CurrentDwarfLoc(0,0,0,DWARF2_FLAG_IS_STMT,0,0) {
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MachOUniquingMap = 0;
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ELFUniquingMap = 0;
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COFFUniquingMap = 0;
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SecureLogFile = getenv("AS_SECURE_LOG_FILE");
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SecureLog = 0;
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SecureLogUsed = false;
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DwarfLocSeen = false;
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}
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MCContext::~MCContext() {
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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 we have the MachO uniquing map, free it.
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delete (MachOUniqueMapTy*)MachOUniquingMap;
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delete (ELFUniqueMapTy*)ELFUniquingMap;
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delete (COFFUniqueMapTy*)COFFUniquingMap;
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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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// 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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// Determine whether this is an assembler temporary or normal label.
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bool isTemporary = Name.startswith(MAI.getPrivateGlobalPrefix());
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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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if (Entry.getValue()) return Entry.getValue();
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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 StringMapEntry.
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MCSymbol *Result = new (*this) MCSymbol(Entry.getKey(), isTemporary);
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Entry.setValue(Result);
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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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Name.toVector(NameSV);
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return GetOrCreateSymbol(NameSV.str());
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}
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MCSymbol *MCContext::CreateTempSymbol() {
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return GetOrCreateSymbol(Twine(MAI.getPrivateGlobalPrefix()) +
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"tmp" + Twine(NextUniqueID++));
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}
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unsigned MCContext::NextInstance(int64_t 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(int64_t 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::CreateDirectionalLocalSymbol(int64_t LocalLabelVal) {
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return GetOrCreateSymbol(Twine(MAI.getPrivateGlobalPrefix()) +
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Twine(LocalLabelVal) +
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"\2" +
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Twine(NextInstance(LocalLabelVal)));
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}
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MCSymbol *MCContext::GetDirectionalLocalSymbol(int64_t LocalLabelVal,
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int bORf) {
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return GetOrCreateSymbol(Twine(MAI.getPrivateGlobalPrefix()) +
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Twine(LocalLabelVal) +
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"\2" +
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Twine(GetInstance(LocalLabelVal) + bORf));
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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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//===----------------------------------------------------------------------===//
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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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// Create the map if it doesn't already exist.
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if (MachOUniquingMap == 0)
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MachOUniquingMap = new MachOUniqueMapTy();
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MachOUniqueMapTy &Map = *(MachOUniqueMapTy*)MachOUniquingMap;
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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 = Map[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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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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if (ELFUniquingMap == 0)
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ELFUniquingMap = new ELFUniqueMapTy();
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ELFUniqueMapTy &Map = *(ELFUniqueMapTy*)ELFUniquingMap;
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// Do the lookup, if we have a hit, return it.
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StringMapEntry<const MCSectionELF*> &Entry = Map.GetOrCreateValue(Section);
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if (Entry.getValue()) return Entry.getValue();
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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 = NULL;
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if (!Group.empty())
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GroupSym = GetOrCreateSymbol(Group);
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MCSectionELF *Result = new (*this) MCSectionELF(Entry.getKey(), Type, Flags,
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Kind, EntrySize, GroupSym);
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Entry.setValue(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", MCSectionELF::SHT_GROUP, 0,
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SectionKind::getReadOnly(), 4, NULL);
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return Result;
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}
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const MCSection *MCContext::getCOFFSection(StringRef Section,
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unsigned Characteristics,
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int Selection,
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SectionKind Kind) {
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if (COFFUniquingMap == 0)
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COFFUniquingMap = new COFFUniqueMapTy();
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COFFUniqueMapTy &Map = *(COFFUniqueMapTy*)COFFUniquingMap;
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// Do the lookup, if we have a hit, return it.
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StringMapEntry<const MCSectionCOFF*> &Entry = Map.GetOrCreateValue(Section);
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if (Entry.getValue()) return Entry.getValue();
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MCSectionCOFF *Result = new (*this) MCSectionCOFF(Entry.getKey(),
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Characteristics,
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Selection, Kind);
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Entry.setValue(Result);
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return Result;
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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 FileName, unsigned FileNumber) {
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// TODO: a FileNumber of zero says to use the next available file number.
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// Note: in GenericAsmParser::ParseDirectiveFile() FileNumber was checked
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// to not be less than one. This needs to be change to be not less than zero.
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// Make space for this FileNumber in the MCDwarfFiles vector if needed.
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if (FileNumber >= MCDwarfFiles.size()) {
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MCDwarfFiles.resize(FileNumber + 1);
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} else {
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MCDwarfFile *&ExistingFile = MCDwarfFiles[FileNumber];
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if (ExistingFile)
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// It is an error to use see the same number more than once.
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return 0;
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}
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// Get the new MCDwarfFile slot for this FileNumber.
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MCDwarfFile *&File = MCDwarfFiles[FileNumber];
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// Separate the directory part from the basename of the FileName.
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std::pair<StringRef, StringRef> Slash = FileName.rsplit('/');
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// Find or make a entry in the MCDwarfDirs vector for this Directory.
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StringRef Name;
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unsigned DirIndex;
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// Capture directory name.
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if (Slash.second.empty()) {
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Name = Slash.first;
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DirIndex = 0; // For FileNames with no directories a DirIndex of 0 is used.
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} else {
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StringRef Directory = Slash.first;
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Name = Slash.second;
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for (DirIndex = 0; DirIndex < MCDwarfDirs.size(); DirIndex++) {
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if (Directory == MCDwarfDirs[DirIndex])
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break;
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}
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if (DirIndex >= MCDwarfDirs.size()) {
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char *Buf = static_cast<char *>(Allocate(Directory.size()));
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memcpy(Buf, Directory.data(), Directory.size());
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MCDwarfDirs.push_back(StringRef(Buf, Directory.size()));
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}
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// The DirIndex is one based, as DirIndex of 0 is used for FileNames with
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// no directories. MCDwarfDirs[] is unlike MCDwarfFiles[] in that the
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// directory names are stored at MCDwarfDirs[DirIndex-1] where FileNames are
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// stored at MCDwarfFiles[FileNumber].Name .
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DirIndex++;
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}
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// Now make the MCDwarfFile entry and place it in the slot in the MCDwarfFiles
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// vector.
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char *Buf = static_cast<char *>(Allocate(Name.size()));
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memcpy(Buf, Name.data(), Name.size());
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File = new (*this) MCDwarfFile(StringRef(Buf, Name.size()), DirIndex);
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// return the allocated FileNumber.
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return 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) {
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if(FileNumber == 0 || FileNumber >= MCDwarfFiles.size())
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return false;
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return MCDwarfFiles[FileNumber] != 0;
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}
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