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llvm-mirror/lib/MC/MCLinkerOptimizationHint.cpp
Quentin Colombet 2f9673e7ea [ARM64][CollectLOH] Add some comments to explain how the LOHs
framework works (for the compiler part), since the design
document is not available.

llvm-svn: 205379
2014-04-02 01:02:28 +00:00

36 lines
1.3 KiB
C++

//===-- llvm/MC/MCLinkerOptimizationHint.cpp ----- LOH handling -*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/MC/MCLinkerOptimizationHint.h"
#include "llvm/MC/MCAsmLayout.h"
#include "llvm/Support/LEB128.h"
#include "llvm/MC/MCStreamer.h"
using namespace llvm;
// Each LOH is composed by, in this order (each field is encoded using ULEB128):
// - Its kind.
// - Its number of arguments (let say N).
// - Its arg1.
// - ...
// - Its argN.
// <arg1> to <argN> are absolute addresses in the object file, i.e.,
// relative addresses from the beginning of the object file.
void MCLOHDirective::Emit_impl(raw_ostream &OutStream,
const MachObjectWriter &ObjWriter,
const MCAsmLayout &Layout) const {
const MCAssembler &Asm = Layout.getAssembler();
encodeULEB128(Kind, OutStream);
encodeULEB128(Args.size(), OutStream);
for (LOHArgs::const_iterator It = Args.begin(), EndIt = Args.end();
It != EndIt; ++It)
encodeULEB128(ObjWriter.getSymbolAddress(&Asm.getSymbolData(**It), Layout),
OutStream);
}