76 lines
2.5 KiB
C++
76 lines
2.5 KiB
C++
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//===- 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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MCSymbol *AddressPool::emitHeader(AsmPrinter &Asm, MCSection *Section) {
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static const uint8_t AddrSize = Asm.getDataLayout().getPointerSize();
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StringRef Prefix = "debug_addr_";
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MCSymbol *BeginLabel = Asm.createTempSymbol(Prefix + "start");
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MCSymbol *EndLabel = Asm.createTempSymbol(Prefix + "end");
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Asm.emitDwarfUnitLength(EndLabel, BeginLabel, "Length of contribution");
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Asm.OutStreamer->emitLabel(BeginLabel);
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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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return EndLabel;
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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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MCSymbol *EndLabel = nullptr;
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if (Asm.getDwarfVersion() >= 5)
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EndLabel = 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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if (EndLabel)
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Asm.OutStreamer->emitLabel(EndLabel);
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}
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