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Currently, we emit DW_AT_addr_base that points to the beginning of the .debug_addr section. That is not correct for the DWARF5 case because address table contains the header and the attribute should point to the first entry following the header. This is currently the reason why LLDB does not work with such executables correctly. Patch fixes the issue. Differential revision: https://reviews.llvm.org/D52168 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@342635 91177308-0d34-0410-b5e6-96231b3b80d8
67 lines
2.2 KiB
C++
67 lines
2.2 KiB
C++
//===- llvm/CodeGen/AddressPool.cpp - Dwarf Debug Framework ---------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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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.emitInt32(Length); // TODO: Support DWARF64 format.
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Asm.emitInt16(Asm.getDwarfVersion());
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Asm.emitInt8(AddrSize);
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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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// 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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if (Pool.empty())
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return;
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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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