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 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