llvm-6502/lib/MC/MCContext.cpp
2009-07-27 21:22:30 +00:00

81 lines
2.0 KiB
C++

//===- lib/MC/MCContext.cpp - Machine Code Context ------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCValue.h"
using namespace llvm;
MCContext::MCContext()
{
}
MCContext::~MCContext() {
}
MCSection *MCContext::GetSection(const StringRef &Name) {
MCSection *&Entry = Sections[Name];
if (!Entry)
Entry = new (*this) MCSection(Name);
return Entry;
}
MCSymbol *MCContext::CreateSymbol(const StringRef &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(Name, false);
}
MCSymbol *MCContext::GetOrCreateSymbol(const StringRef &Name) {
MCSymbol *&Entry = Symbols[Name];
if (Entry) return Entry;
return Entry = new (*this) MCSymbol(Name, false);
}
MCSymbol *MCContext::CreateTemporarySymbol(const StringRef &Name) {
// If unnamed, just create a symbol.
if (Name.empty())
new (*this) MCSymbol("", true);
// Otherwise create as usual.
MCSymbol *&Entry = Symbols[Name];
assert(!Entry && "Duplicate symbol definition!");
return Entry = new (*this) MCSymbol(Name, true);
}
MCSymbol *MCContext::LookupSymbol(const StringRef &Name) const {
return Symbols.lookup(Name);
}
void MCContext::ClearSymbolValue(MCSymbol *Sym) {
SymbolValues.erase(Sym);
}
void MCContext::SetSymbolValue(MCSymbol *Sym, const MCValue &Value) {
SymbolValues[Sym] = Value;
}
const MCValue *MCContext::GetSymbolValue(MCSymbol *Sym) const {
DenseMap<MCSymbol*, MCValue>::iterator it = SymbolValues.find(Sym);
if (it == SymbolValues.end())
return 0;
return &it->second;
}