DebugInfo: Reuse common addresses for rnglist base address selections
This makes the offsets larger (since they are further from the base address) but those are in the .dwo - and allows removing addresses and relocations from the .o file. This could be built into the AddressPool more fundamentally, perhaps - when you ask for an AddressPool entry you could say "or give me some other entry and an offset I need to use" - though what to do about situations where the first use of an address in a section is not the earliest address in that section... is tricky. At least with range addresses we can be fairly sure we've seen the earliest address first because we see the start address for the function. llvm-svn: 345224
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@ -277,6 +277,7 @@ void DwarfCompileUnit::addRange(RangeSpan Range) {
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(&CURanges.back().getEnd()->getSection() !=
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&Range.getEnd()->getSection())) {
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CURanges.push_back(Range);
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DD->addSectionLabel(Range.getStart());
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return;
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}
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@ -2171,6 +2171,7 @@ static void emitRangeList(DwarfDebug &DD, AsmPrinter *Asm,
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// the lowest address/range in this object.
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Base = P.second.front()->getStart();
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if (DwarfVersion >= 5) {
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Base = DD.getSectionLabel(&Base->getSection());
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Asm->OutStreamer->AddComment("DW_RLE_base_addressx");
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Asm->OutStreamer->EmitIntValue(dwarf::DW_RLE_base_addressx, 1);
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Asm->OutStreamer->AddComment(" base address index");
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@ -2623,3 +2624,11 @@ void DwarfDebug::addAccelType(const DICompileUnit &CU, StringRef Name,
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uint16_t DwarfDebug::getDwarfVersion() const {
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return Asm->OutStreamer->getContext().getDwarfVersion();
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}
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void DwarfDebug::addSectionLabel(const MCSymbol *Sym) {
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SectionLabels.insert(std::make_pair(&Sym->getSection(), Sym));
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}
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const MCSymbol *DwarfDebug::getSectionLabel(const MCSection *S) {
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return SectionLabels.find(S)->second;
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}
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@ -327,6 +327,8 @@ class DwarfDebug : public DebugHandlerBase {
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/// used to keep track of which types we have emitted type units for.
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DenseMap<const MDNode *, uint64_t> TypeSignatures;
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DenseMap<const MCSection *, const MCSymbol *> SectionLabels;
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SmallVector<
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std::pair<std::unique_ptr<DwarfTypeUnit>, const DICompositeType *>, 1>
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TypeUnitsUnderConstruction;
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@ -721,6 +723,9 @@ public:
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bool tuneForLLDB() const { return DebuggerTuning == DebuggerKind::LLDB; }
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bool tuneForSCE() const { return DebuggerTuning == DebuggerKind::SCE; }
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/// @}
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void addSectionLabel(const MCSymbol *Sym);
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const MCSymbol *getSectionLabel(const MCSection *S);
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};
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} // end namespace llvm
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@ -13,9 +13,9 @@
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; CHECK: 0x00000004 => 0x00000010
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; CHECK: ]
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; CHECK: ranges:
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; CHECK: 0x00000010: [DW_RLE_base_addressx]: 0x0000000000000002
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; CHECK: 0x00000012: [DW_RLE_offset_pair ]: 0x0000000000000000, 0x000000000000000b => [0x0000000000000001, 0x000000000000000c)
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; CHECK: 0x00000015: [DW_RLE_offset_pair ]: 0x000000000000000d, 0x0000000000000012 => [0x000000000000000e, 0x0000000000000013)
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; CHECK: 0x00000010: [DW_RLE_base_addressx]: 0x0000000000000000
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; CHECK: 0x00000012: [DW_RLE_offset_pair ]: 0x0000000000000001, 0x000000000000000c => [0x0000000000000001, 0x000000000000000c)
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; CHECK: 0x00000015: [DW_RLE_offset_pair ]: 0x000000000000000e, 0x0000000000000013 => [0x000000000000000e, 0x0000000000000013)
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; CHECK: 0x00000018: [DW_RLE_end_of_list ]
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; Function Attrs: noinline optnone uwtable
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