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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
70 lines
2.4 KiB
C++
70 lines
2.4 KiB
C++
//===- llvm/CodeGen/AddressPool.cpp - Dwarf Debug Framework ---------------===//
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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 "AddressPool.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/Target/TargetLoweringObjectFile.h"
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#include <utility>
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using namespace llvm;
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unsigned AddressPool::getIndex(const MCSymbol *Sym, bool TLS) {
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HasBeenUsed = true;
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auto IterBool =
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Pool.insert(std::make_pair(Sym, AddressPoolEntry(Pool.size(), TLS)));
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return IterBool.first->second.Number;
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}
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void AddressPool::emitHeader(AsmPrinter &Asm, MCSection *Section) {
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static const uint8_t AddrSize = Asm.getDataLayout().getPointerSize();
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uint64_t Length = sizeof(uint16_t) // version
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+ sizeof(uint8_t) // address_size
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+ sizeof(uint8_t) // segment_selector_size
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+ AddrSize * Pool.size(); // entries
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Asm.OutStreamer->AddComment("Length of contribution");
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Asm.emitInt32(Length); // TODO: Support DWARF64 format.
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Asm.OutStreamer->AddComment("DWARF version number");
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Asm.emitInt16(Asm.getDwarfVersion());
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Asm.OutStreamer->AddComment("Address size");
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Asm.emitInt8(AddrSize);
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Asm.OutStreamer->AddComment("Segment selector size");
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Asm.emitInt8(0); // TODO: Support non-zero segment_selector_size.
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}
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// Emit addresses into the section given.
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void AddressPool::emit(AsmPrinter &Asm, MCSection *AddrSection) {
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if (isEmpty())
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return;
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// Start the dwarf addr section.
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Asm.OutStreamer->SwitchSection(AddrSection);
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if (Asm.getDwarfVersion() >= 5)
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emitHeader(Asm, AddrSection);
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// Define the symbol that marks the start of the contribution.
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// It is referenced via DW_AT_addr_base.
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Asm.OutStreamer->EmitLabel(AddressTableBaseSym);
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// Order the address pool entries by ID
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SmallVector<const MCExpr *, 64> Entries(Pool.size());
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for (const auto &I : Pool)
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Entries[I.second.Number] =
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I.second.TLS
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? Asm.getObjFileLowering().getDebugThreadLocalSymbol(I.first)
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: MCSymbolRefExpr::create(I.first, Asm.OutContext);
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for (const MCExpr *Entry : Entries)
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Asm.OutStreamer->EmitValue(Entry, Asm.getDataLayout().getPointerSize());
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}
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