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annotate lib/CodeGen/AsmPrinter/DwarfStringPool.cpp @ 95:afa8332a0e37 LLVM3.8

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LLVM 3.8
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Tue, 13 Oct 2015 17:48:58 +0900
parents 60c9769439b8
children 803732b1fca8
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1 //===-- llvm/CodeGen/DwarfStringPool.cpp - Dwarf Debug Framework ----------===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9
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10 #include "DwarfStringPool.h"
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11 #include "llvm/CodeGen/AsmPrinter.h"
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12 #include "llvm/MC/MCAsmInfo.h"
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13 #include "llvm/MC/MCStreamer.h"
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14
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15 using namespace llvm;
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16
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17 DwarfStringPool::DwarfStringPool(BumpPtrAllocator &A, AsmPrinter &Asm,
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18 StringRef Prefix)
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19 : Pool(A), Prefix(Prefix),
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20 ShouldCreateSymbols(Asm.MAI->doesDwarfUseRelocationsAcrossSections()) {}
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21
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22 DwarfStringPool::EntryRef DwarfStringPool::getEntry(AsmPrinter &Asm,
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23 StringRef Str) {
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24 auto I = Pool.insert(std::make_pair(Str, EntryTy()));
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25 if (I.second) {
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26 auto &Entry = I.first->second;
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27 Entry.Index = Pool.size() - 1;
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28 Entry.Offset = NumBytes;
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29 Entry.Symbol = ShouldCreateSymbols ? Asm.createTempSymbol(Prefix) : nullptr;
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30
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31 NumBytes += Str.size() + 1;
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32 assert(NumBytes > Entry.Offset && "Unexpected overflow");
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33 }
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34 return EntryRef(*I.first);
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35 }
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36
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37 void DwarfStringPool::emit(AsmPrinter &Asm, MCSection *StrSection,
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38 MCSection *OffsetSection) {
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39 if (Pool.empty())
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40 return;
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41
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42 // Start the dwarf str section.
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43 Asm.OutStreamer->SwitchSection(StrSection);
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45 // Get all of the string pool entries and put them in an array by their ID so
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46 // we can sort them.
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47 SmallVector<const StringMapEntry<EntryTy> *, 64> Entries(Pool.size());
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49 for (const auto &E : Pool)
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50 Entries[E.getValue().Index] = &E;
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52 for (const auto &Entry : Entries) {
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53 assert(ShouldCreateSymbols == static_cast<bool>(Entry->getValue().Symbol) &&
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54 "Mismatch between setting and entry");
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55
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56 // Emit a label for reference from debug information entries.
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57 if (ShouldCreateSymbols)
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58 Asm.OutStreamer->EmitLabel(Entry->getValue().Symbol);
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60 // Emit the string itself with a terminating null byte.
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61 Asm.OutStreamer->AddComment("string offset=" +
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62 Twine(Entry->getValue().Offset));
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63 Asm.OutStreamer->EmitBytes(
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64 StringRef(Entry->getKeyData(), Entry->getKeyLength() + 1));
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65 }
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67 // If we've got an offset section go ahead and emit that now as well.
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68 if (OffsetSection) {
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69 Asm.OutStreamer->SwitchSection(OffsetSection);
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70 unsigned size = 4; // FIXME: DWARF64 is 8.
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71 for (const auto &Entry : Entries)
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72 Asm.OutStreamer->EmitIntValue(Entry->getValue().Offset, size);
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73 }
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74 }