forked from OSchip/llvm-project
75 lines
2.4 KiB
C++
75 lines
2.4 KiB
C++
//===-- llvm/CodeGen/DwarfStringPool.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 "DwarfStringPool.h"
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#include "llvm/MC/MCStreamer.h"
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using namespace llvm;
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MCSymbol *DwarfStringPool::getSectionSymbol() { return SectionSymbol; }
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static std::pair<MCSymbol *, unsigned> &
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getEntry(AsmPrinter &Asm,
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StringMap<std::pair<MCSymbol *, unsigned>, BumpPtrAllocator &> &Pool,
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StringRef Prefix, StringRef Str) {
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std::pair<MCSymbol *, unsigned> &Entry =
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Pool.GetOrCreateValue(Str).getValue();
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if (!Entry.first) {
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Entry.second = Pool.size() - 1;
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Entry.first = Asm.GetTempSymbol(Prefix, Entry.second);
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}
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return Entry;
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}
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MCSymbol *DwarfStringPool::getSymbol(AsmPrinter &Asm, StringRef Str) {
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return getEntry(Asm, Pool, Prefix, Str).first;
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}
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unsigned DwarfStringPool::getIndex(AsmPrinter &Asm, StringRef Str) {
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return getEntry(Asm, Pool, Prefix, Str).second;
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}
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void DwarfStringPool::emit(AsmPrinter &Asm, const MCSection *StrSection,
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const MCSection *OffsetSection,
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const MCSymbol *StrSecSym) {
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if (Pool.empty())
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return;
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// Start the dwarf str section.
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Asm.OutStreamer.SwitchSection(StrSection);
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// Get all of the string pool entries and put them in an array by their ID so
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// we can sort them.
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SmallVector<const StringMapEntry<std::pair<MCSymbol *, unsigned>> *, 64>
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Entries(Pool.size());
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for (const auto &E : Pool)
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Entries[E.getValue().second] = &E;
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for (const auto &Entry : Entries) {
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// Emit a label for reference from debug information entries.
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Asm.OutStreamer.EmitLabel(Entry->getValue().first);
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// Emit the string itself with a terminating null byte.
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Asm.OutStreamer.EmitBytes(
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StringRef(Entry->getKeyData(), Entry->getKeyLength() + 1));
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}
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// If we've got an offset section go ahead and emit that now as well.
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if (OffsetSection) {
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Asm.OutStreamer.SwitchSection(OffsetSection);
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unsigned offset = 0;
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unsigned size = 4; // FIXME: DWARF64 is 8.
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for (const auto &Entry : Entries) {
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Asm.OutStreamer.EmitIntValue(offset, size);
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offset += Entry->getKeyLength() + 1;
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}
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}
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}
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