MCContext.cpp revision b5261ebabb215330d6549048b825d236fb3c9b6b 
1//===- lib/MC/MCContext.cpp - Machine Code Context ------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10#include "llvm/MC/MCContext.h"
11
12#include "llvm/MC/MCSection.h"
13#include "llvm/MC/MCSymbol.h"
14#include "llvm/MC/MCValue.h"
15using namespace llvm;
16
17MCContext::MCContext()
18{
19}
20
21MCContext::~MCContext() {
22}
23
24MCSection *MCContext::GetSection(const StringRef &Name) {
25  MCSection *&Entry = Sections[Name];
26
27  if (!Entry)
28    Entry = new (*this) MCSection(Name);
29
30  return Entry;
31}
32
33MCSymbol *MCContext::CreateSymbol(const StringRef &Name) {
34  assert(Name[0] != '\0' && "Normal symbols cannot be unnamed!");
35
36  // Create and bind the symbol, and ensure that names are unique.
37  MCSymbol *&Entry = Symbols[Name];
38  assert(!Entry && "Duplicate symbol definition!");
39  return Entry = new (*this) MCSymbol(Name, false);
40}
41
42MCSymbol *MCContext::GetOrCreateSymbol(const StringRef &Name) {
43  MCSymbol *&Entry = Symbols[Name];
44  if (Entry) return Entry;
45
46  return Entry = new (*this) MCSymbol(Name, false);
47}
48
49
50MCSymbol *MCContext::CreateTemporarySymbol(const StringRef &Name) {
51  // If unnamed, just create a symbol.
52  if (Name.empty())
53    new (*this) MCSymbol("", true);
54
55  // Otherwise create as usual.
56  MCSymbol *&Entry = Symbols[Name];
57  assert(!Entry && "Duplicate symbol definition!");
58  return Entry = new (*this) MCSymbol(Name, true);
59}
60
61MCSymbol *MCContext::LookupSymbol(const StringRef &Name) const {
62  return Symbols.lookup(Name);
63}
64
65void MCContext::ClearSymbolValue(MCSymbol *Sym) {
66  SymbolValues.erase(Sym);
67}
68
69void MCContext::SetSymbolValue(MCSymbol *Sym, const MCValue &Value) {
70  SymbolValues[Sym] = Value;
71}
72
73const MCValue *MCContext::GetSymbolValue(MCSymbol *Sym) const {
74  DenseMap<MCSymbol*, MCValue>::iterator it = SymbolValues.find(Sym);
75
76  if (it == SymbolValues.end())
77    return 0;
78
79  return &it->second;
80}
81