forked from OSchip/llvm-project
126 lines
4.2 KiB
C++
126 lines
4.2 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/MCSymbol.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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MCContext::MCContext(const MCAsmInfo &mai) : MAI(mai), NextUniqueID(0) {
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MachOUniquingMap = 0;
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ELFUniquingMap = 0;
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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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}
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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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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 MCSection *MCContext::
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getELFSection(StringRef Section, unsigned Type, unsigned Flags,
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SectionKind Kind, bool IsExplicit) {
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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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MCSectionELF *Result = new (*this) MCSectionELF(Entry.getKey(), Type, Flags,
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Kind, IsExplicit);
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Entry.setValue(Result);
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return Result;
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}
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