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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
60 lines
2.0 KiB
C++
60 lines
2.0 KiB
C++
//===- llvm/MC/MCLinkerOptimizationHint.cpp ----- LOH handling ------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/MC/MCLinkerOptimizationHint.h"
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#include "llvm/MC/MCAsmLayout.h"
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#include "llvm/MC/MCMachObjectWriter.h"
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#include "llvm/Support/LEB128.h"
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#include "llvm/Support/raw_ostream.h"
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#include <cstddef>
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#include <cstdint>
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using namespace llvm;
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// Each LOH is composed by, in this order (each field is encoded using ULEB128):
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// - Its kind.
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// - Its number of arguments (let say N).
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// - Its arg1.
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// - ...
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// - Its argN.
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// <arg1> to <argN> are absolute addresses in the object file, i.e.,
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// relative addresses from the beginning of the object file.
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void MCLOHDirective::emit_impl(raw_ostream &OutStream,
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const MachObjectWriter &ObjWriter,
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const MCAsmLayout &Layout) const {
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encodeULEB128(Kind, OutStream);
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encodeULEB128(Args.size(), OutStream);
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for (const MCSymbol *Arg : Args)
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encodeULEB128(ObjWriter.getSymbolAddress(*Arg, Layout), OutStream);
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}
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void MCLOHDirective::emit(MachObjectWriter &ObjWriter,
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const MCAsmLayout &Layout) const {
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raw_ostream &OutStream = ObjWriter.W.OS;
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emit_impl(OutStream, ObjWriter, Layout);
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}
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uint64_t MCLOHDirective::getEmitSize(const MachObjectWriter &ObjWriter,
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const MCAsmLayout &Layout) const {
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class raw_counting_ostream : public raw_ostream {
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uint64_t Count = 0;
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void write_impl(const char *, size_t size) override { Count += size; }
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uint64_t current_pos() const override { return Count; }
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public:
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raw_counting_ostream() = default;
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~raw_counting_ostream() override { flush(); }
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};
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raw_counting_ostream OutStream;
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emit_impl(OutStream, ObjWriter, Layout);
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return OutStream.tell();
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}
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