MCStreamer.cpp revision 1674b0b0e4972b844833f253286cbf99a6e99d6e 
1//===- lib/MC/MCStreamer.cpp - Streaming Machine Code Output --------------===//
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/MCStreamer.h"
11#include "llvm/MC/MCExpr.h"
12#include "llvm/Support/raw_ostream.h"
13#include "llvm/ADT/SmallString.h"
14#include "llvm/ADT/Twine.h"
15#include <cstdlib>
16using namespace llvm;
17
18MCStreamer::MCStreamer(MCContext &Ctx) : Context(Ctx), CurSection(0),
19                                         PrevSection(0) {
20}
21
22MCStreamer::~MCStreamer() {
23}
24
25raw_ostream &MCStreamer::GetCommentOS() {
26  // By default, discard comments.
27  return nulls();
28}
29
30
31/// EmitIntValue - Special case of EmitValue that avoids the client having to
32/// pass in a MCExpr for constant integers.
33void MCStreamer::EmitIntValue(uint64_t Value, unsigned Size,
34                              unsigned AddrSpace) {
35  EmitValue(MCConstantExpr::Create(Value, getContext()), Size, AddrSpace);
36}
37
38void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size,
39                                 unsigned AddrSpace) {
40  EmitValue(MCSymbolRefExpr::Create(Sym, getContext()), Size, AddrSpace);
41}
42
43/// EmitFill - Emit NumBytes bytes worth of the value specified by
44/// FillValue.  This implements directives such as '.space'.
45void MCStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue,
46                          unsigned AddrSpace) {
47  const MCExpr *E = MCConstantExpr::Create(FillValue, getContext());
48  for (uint64_t i = 0, e = NumBytes; i != e; ++i)
49    EmitValue(E, 1, AddrSpace);
50}
51
52/// EmitRawText - If this file is backed by an assembly streamer, this dumps
53/// the specified string in the output .s file.  This capability is
54/// indicated by the hasRawTextSupport() predicate.
55void MCStreamer::EmitRawText(StringRef String) {
56  errs() << "EmitRawText called on an MCStreamer that doesn't support it, "
57  " something must not be fully mc'ized\n";
58  abort();
59}
60
61void MCStreamer::EmitRawText(const Twine &T) {
62  SmallString<128> Str;
63  T.toVector(Str);
64  EmitRawText(Str.str());
65}
66