1 //===- lib/MC/MCContext.cpp - Machine Code Context ------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "llvm/MC/MCContext.h"
12 #include "llvm/MC/MCSection.h"
13 #include "llvm/MC/MCSymbol.h"
14 #include "llvm/MC/MCValue.h"
17 MCContext::MCContext() {
20 MCContext::~MCContext() {
21 // NOTE: The sections are all allocated out of a bump pointer allocator,
22 // we don't need to free them here.
25 MCSymbol *MCContext::CreateSymbol(const StringRef &Name) {
26 assert(Name[0] != '\0' && "Normal symbols cannot be unnamed!");
28 // Create and bind the symbol, and ensure that names are unique.
29 MCSymbol *&Entry = Symbols[Name];
30 assert(!Entry && "Duplicate symbol definition!");
31 return Entry = new (*this) MCSymbol(Name, false);
34 MCSymbol *MCContext::GetOrCreateSymbol(const StringRef &Name) {
35 MCSymbol *&Entry = Symbols[Name];
36 if (Entry) return Entry;
38 return Entry = new (*this) MCSymbol(Name, false);
42 MCSymbol *MCContext::CreateTemporarySymbol(const StringRef &Name) {
43 // If unnamed, just create a symbol.
45 new (*this) MCSymbol("", true);
47 // Otherwise create as usual.
48 MCSymbol *&Entry = Symbols[Name];
49 assert(!Entry && "Duplicate symbol definition!");
50 return Entry = new (*this) MCSymbol(Name, true);
53 MCSymbol *MCContext::LookupSymbol(const StringRef &Name) const {
54 return Symbols.lookup(Name);
57 void MCContext::ClearSymbolValue(const MCSymbol *Sym) {
58 SymbolValues.erase(Sym);
61 void MCContext::SetSymbolValue(const MCSymbol *Sym, const MCValue &Value) {
62 SymbolValues[Sym] = Value;
65 const MCValue *MCContext::GetSymbolValue(const MCSymbol *Sym) const {
66 DenseMap<const MCSymbol*, MCValue>::iterator it = SymbolValues.find(Sym);
68 if (it == SymbolValues.end())