forked from OSchip/llvm-project
65 lines
2.1 KiB
C++
65 lines
2.1 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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Asm.OutStreamer->SwitchSection(Section);
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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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if (Asm.getDwarfVersion() >= 5)
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emitHeader(Asm, AddrSection);
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if (Pool.empty())
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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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// 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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