1//===-- llvm/MC/MCLinkerOptimizationHint.cpp ----- LOH handling -*- C++ -*-===//
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/MCLinkerOptimizationHint.h"
11#include "llvm/MC/MCAsmLayout.h"
12#include "llvm/Support/LEB128.h"
13#include "llvm/MC/MCStreamer.h"
14
15using namespace llvm;
16
17// Each LOH is composed by, in this order (each field is encoded using ULEB128):
18// - Its kind.
19// - Its number of arguments (let say N).
20// - Its arg1.
21// - ...
22// - Its argN.
23// <arg1> to <argN> are absolute addresses in the object file, i.e.,
24// relative addresses from the beginning of the object file.
25void MCLOHDirective::Emit_impl(raw_ostream &OutStream,
26                               const MachObjectWriter &ObjWriter,
27                               const MCAsmLayout &Layout) const {
28  const MCAssembler &Asm = Layout.getAssembler();
29  encodeULEB128(Kind, OutStream);
30  encodeULEB128(Args.size(), OutStream);
31  for (LOHArgs::const_iterator It = Args.begin(), EndIt = Args.end();
32       It != EndIt; ++It)
33    encodeULEB128(ObjWriter.getSymbolAddress(&Asm.getSymbolData(**It), Layout),
34                  OutStream);
35}
36