-//===- lib/MachineCode/MCContext.cpp - Machine Code Context ---------------===//
+//===- lib/MC/MCContext.cpp - Machine Code Context ------------------------===//
//
// The LLVM Compiler Infrastructure
//
//===----------------------------------------------------------------------===//
#include "llvm/MC/MCContext.h"
-
-#include "llvm/MC/MCAtom.h"
-#include "llvm/MC/MCImm.h"
-#include "llvm/MC/MCSection.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCSectionMachO.h"
+#include "llvm/MC/MCSectionELF.h"
+#include "llvm/MC/MCSectionCOFF.h"
#include "llvm/MC/MCSymbol.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/Twine.h"
using namespace llvm;
-MCContext::MCContext()
-{
+typedef StringMap<const MCSectionMachO*> MachOUniqueMapTy;
+typedef StringMap<const MCSectionELF*> ELFUniqueMapTy;
+typedef StringMap<const MCSectionCOFF*> COFFUniqueMapTy;
+
+
+MCContext::MCContext(const MCAsmInfo &mai) : MAI(mai), NextUniqueID(0) {
+ MachOUniquingMap = 0;
+ ELFUniquingMap = 0;
+ COFFUniquingMap = 0;
}
MCContext::~MCContext() {
+ // NOTE: The symbols are all allocated out of a bump pointer allocator,
+ // we don't need to free them here.
+
+ // If we have the MachO uniquing map, free it.
+ delete (MachOUniqueMapTy*)MachOUniquingMap;
+ delete (ELFUniqueMapTy*)ELFUniquingMap;
+ delete (COFFUniqueMapTy*)COFFUniquingMap;
}
-MCSection *MCContext::GetSection(const char *Name) {
- MCSection *&Entry = Sections[Name];
+//===----------------------------------------------------------------------===//
+// Symbol Manipulation
+//===----------------------------------------------------------------------===//
+
+MCSymbol *MCContext::GetOrCreateSymbol(StringRef Name) {
+ assert(!Name.empty() && "Normal symbols cannot be unnamed!");
+
+ // Determine whether this is an assembler temporary or normal label.
+ bool isTemporary = Name.startswith(MAI.getPrivateGlobalPrefix());
- if (!Entry)
- Entry = new (this) MCSection(Name);
+ // Do the lookup and get the entire StringMapEntry. We want access to the
+ // key if we are creating the entry.
+ StringMapEntry<MCSymbol*> &Entry = Symbols.GetOrCreateValue(Name);
+ if (Entry.getValue()) return Entry.getValue();
- return Entry;
-}
-
-MCAtom *MCContext::CreateAtom(MCSection *Section) {
- return new (this) MCAtom(Section);
+ // Ok, the entry doesn't already exist. Have the MCSymbol object itself refer
+ // to the copy of the string that is embedded in the StringMapEntry.
+ MCSymbol *Result = new (*this) MCSymbol(Entry.getKey(), isTemporary);
+ Entry.setValue(Result);
+ return Result;
}
-MCSymbol *MCContext::CreateSymbol(MCAtom *Atom, const char *Name) {
- assert(Name[0] != '\0' && "Normal symbols cannot be unnamed!");
-
- // Create and bind the symbol, and ensure that names are unique.
- MCSymbol *&Entry = Symbols[Name];
- assert(!Entry && "Duplicate symbol definition!");
- return Entry = new (this) MCSymbol(Atom, Name, false);
+MCSymbol *MCContext::GetOrCreateSymbol(const Twine &Name) {
+ SmallString<128> NameSV;
+ Name.toVector(NameSV);
+ return GetOrCreateSymbol(NameSV.str());
}
-MCSymbol *MCContext::CreateTemporarySymbol(MCAtom *Atom, const char *Name) {
- // If unnamed, just create a symbol.
- if (Name[0] == '\0')
- new (this) MCSymbol(Atom, "", true);
-
- // Otherwise create as usual.
- MCSymbol *&Entry = Symbols[Name];
- assert(!Entry && "Duplicate symbol definition!");
- return Entry = new (this) MCSymbol(Atom, Name, true);
+MCSymbol *MCContext::CreateTempSymbol() {
+ return GetOrCreateSymbol(Twine(MAI.getPrivateGlobalPrefix()) +
+ "tmp" + Twine(NextUniqueID++));
}
-MCSymbol *MCContext::LookupSymbol(const char *Name) const {
+MCSymbol *MCContext::LookupSymbol(StringRef Name) const {
return Symbols.lookup(Name);
}
-void MCContext::ClearSymbolValue(MCSymbol *Sym) {
- SymbolValues.erase(Sym);
-}
+//===----------------------------------------------------------------------===//
+// Section Management
+//===----------------------------------------------------------------------===//
-void MCContext::SetSymbolValue(MCSymbol *Sym, const MCImm &Value) {
- SymbolValues[Sym] = Value;
+const MCSectionMachO *MCContext::
+getMachOSection(StringRef Segment, StringRef Section,
+ unsigned TypeAndAttributes,
+ unsigned Reserved2, SectionKind Kind) {
+
+ // 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.
+
+ // Create the map if it doesn't already exist.
+ if (MachOUniquingMap == 0)
+ MachOUniquingMap = new MachOUniqueMapTy();
+ MachOUniqueMapTy &Map = *(MachOUniqueMapTy*)MachOUniquingMap;
+
+ // 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.
+ const MCSectionMachO *&Entry = Map[Name.str()];
+ if (Entry) return Entry;
+
+ // Otherwise, return a new section.
+ return Entry = new (*this) MCSectionMachO(Segment, Section, TypeAndAttributes,
+ Reserved2, Kind);
}
-const MCImm *MCContext::GetSymbolValue(MCSymbol *Sym) const {
- DenseMap<MCSymbol*, MCImm>::iterator it = SymbolValues.find(Sym);
- if (it == SymbolValues.end())
- return 0;
+const MCSection *MCContext::
+getELFSection(StringRef Section, unsigned Type, unsigned Flags,
+ SectionKind Kind, bool IsExplicit) {
+ if (ELFUniquingMap == 0)
+ ELFUniquingMap = new ELFUniqueMapTy();
+ ELFUniqueMapTy &Map = *(ELFUniqueMapTy*)ELFUniquingMap;
+
+ // Do the lookup, if we have a hit, return it.
+ StringMapEntry<const MCSectionELF*> &Entry = Map.GetOrCreateValue(Section);
+ if (Entry.getValue()) return Entry.getValue();
+
+ MCSectionELF *Result = new (*this) MCSectionELF(Entry.getKey(), Type, Flags,
+ Kind, IsExplicit);
+ Entry.setValue(Result);
+ return Result;
+}
- return &it->second;
+const MCSection *MCContext::getCOFFSection(StringRef Section,
+ unsigned Characteristics,
+ int Selection,
+ SectionKind Kind) {
+ if (COFFUniquingMap == 0)
+ COFFUniquingMap = new COFFUniqueMapTy();
+ COFFUniqueMapTy &Map = *(COFFUniqueMapTy*)COFFUniquingMap;
+
+ // Do the lookup, if we have a hit, return it.
+ StringMapEntry<const MCSectionCOFF*> &Entry = Map.GetOrCreateValue(Section);
+ if (Entry.getValue()) return Entry.getValue();
+
+ MCSectionCOFF *Result = new (*this) MCSectionCOFF(Entry.getKey(),
+ Characteristics,
+ Selection, Kind);
+
+ Entry.setValue(Result);
+ return Result;
}
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