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/MC/MCAssembler.h"
13 #include "llvm/Support/LEB128.h"
14 
15 using 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.
emit_impl(raw_ostream & OutStream,const MachObjectWriter & ObjWriter,const MCAsmLayout & Layout) const25 void MCLOHDirective::emit_impl(raw_ostream &OutStream,
26                                const MachObjectWriter &ObjWriter,
27                                const MCAsmLayout &Layout) const {
28   encodeULEB128(Kind, OutStream);
29   encodeULEB128(Args.size(), OutStream);
30   for (LOHArgs::const_iterator It = Args.begin(), EndIt = Args.end();
31        It != EndIt; ++It)
32     encodeULEB128(ObjWriter.getSymbolAddress(**It, Layout), OutStream);
33 }
34