MCStreamer.cpp revision 3ff57094a7d176a759ddb1e1668489d89064f56c 
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/MC/MCObjectWriter.h"
13#include "llvm/Support/ErrorHandling.h"
14#include "llvm/Support/raw_ostream.h"
15#include "llvm/ADT/SmallString.h"
16#include "llvm/ADT/Twine.h"
17#include <cstdlib>
18using namespace llvm;
19
20MCStreamer::MCStreamer(MCContext &Ctx) : Context(Ctx), CurSection(0),
21                                         PrevSection(0) {
22}
23
24MCStreamer::~MCStreamer() {
25}
26
27raw_ostream &MCStreamer::GetCommentOS() {
28  // By default, discard comments.
29  return nulls();
30}
31
32
33/// EmitIntValue - Special case of EmitValue that avoids the client having to
34/// pass in a MCExpr for constant integers.
35void MCStreamer::EmitIntValue(uint64_t Value, unsigned Size,
36                              unsigned AddrSpace) {
37  EmitValue(MCConstantExpr::Create(Value, getContext()), Size, AddrSpace);
38}
39
40/// EmitULEB128Value - Special case of EmitULEB128Value that avoids the
41/// client having to pass in a MCExpr for constant integers.
42void MCStreamer::EmitULEB128IntValue(uint64_t Value, unsigned AddrSpace) {
43  EmitULEB128Value(MCConstantExpr::Create(Value, getContext()), AddrSpace);
44}
45
46/// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the
47/// client having to pass in a MCExpr for constant integers.
48void MCStreamer::EmitSLEB128IntValue(int64_t Value, unsigned AddrSpace) {
49  EmitSLEB128Value(MCConstantExpr::Create(Value, getContext()), AddrSpace);
50}
51
52void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size,
53                                 unsigned AddrSpace) {
54  EmitValue(MCSymbolRefExpr::Create(Sym, getContext()), Size, AddrSpace);
55}
56
57/// EmitFill - Emit NumBytes bytes worth of the value specified by
58/// FillValue.  This implements directives such as '.space'.
59void MCStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue,
60                          unsigned AddrSpace) {
61  const MCExpr *E = MCConstantExpr::Create(FillValue, getContext());
62  for (uint64_t i = 0, e = NumBytes; i != e; ++i)
63    EmitValue(E, 1, AddrSpace);
64}
65
66/// EmitRawText - If this file is backed by an assembly streamer, this dumps
67/// the specified string in the output .s file.  This capability is
68/// indicated by the hasRawTextSupport() predicate.
69void MCStreamer::EmitRawText(StringRef String) {
70  errs() << "EmitRawText called on an MCStreamer that doesn't support it, "
71  " something must not be fully mc'ized\n";
72  abort();
73}
74
75void MCStreamer::EmitRawText(const Twine &T) {
76  SmallString<128> Str;
77  T.toVector(Str);
78  EmitRawText(Str.str());
79}
80