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 MCSection *MCContext::GetSection(const StringRef &Name) const {
26 StringMap<MCSection*>::const_iterator I = Sections.find(Name);
27 return I != Sections.end() ? I->second : 0;
30 MCSymbol *MCContext::CreateSymbol(const StringRef &Name) {
31 assert(Name[0] != '\0' && "Normal symbols cannot be unnamed!");
33 // Create and bind the symbol, and ensure that names are unique.
34 MCSymbol *&Entry = Symbols[Name];
35 assert(!Entry && "Duplicate symbol definition!");
36 return Entry = new (*this) MCSymbol(Name, false);
39 MCSymbol *MCContext::GetOrCreateSymbol(const StringRef &Name) {
40 MCSymbol *&Entry = Symbols[Name];
41 if (Entry) return Entry;
43 return Entry = new (*this) MCSymbol(Name, false);
47 MCSymbol *MCContext::CreateTemporarySymbol(const StringRef &Name) {
48 // If unnamed, just create a symbol.
50 new (*this) MCSymbol("", true);
52 // Otherwise create as usual.
53 MCSymbol *&Entry = Symbols[Name];
54 assert(!Entry && "Duplicate symbol definition!");
55 return Entry = new (*this) MCSymbol(Name, true);
58 MCSymbol *MCContext::LookupSymbol(const StringRef &Name) const {
59 return Symbols.lookup(Name);
62 void MCContext::ClearSymbolValue(MCSymbol *Sym) {
63 SymbolValues.erase(Sym);
66 void MCContext::SetSymbolValue(MCSymbol *Sym, const MCValue &Value) {
67 SymbolValues[Sym] = Value;
70 const MCValue *MCContext::GetSymbolValue(MCSymbol *Sym) const {
71 DenseMap<MCSymbol*, MCValue>::iterator it = SymbolValues.find(Sym);
73 if (it == SymbolValues.end())