llvm-6502/lib/MC/MCContext.cpp

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//===- 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() {
// NOTE: The sections are all allocated out of a bump pointer allocator,
// we don't need to free them here.
}
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(const MCSymbol *Sym) {
SymbolValues.erase(Sym);
}
void MCContext::SetSymbolValue(const MCSymbol *Sym, const MCValue &Value) {
SymbolValues[Sym] = Value;
}
const MCValue *MCContext::GetSymbolValue(const MCSymbol *Sym) const {
DenseMap<const MCSymbol*, MCValue>::iterator it = SymbolValues.find(Sym);
if (it == SymbolValues.end())
return 0;
return &it->second;
}