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DebugInfo: Generalize rnglist emission as a precursor to reusing it for loclist emission 

llvm-svn: 373663
This commit is contained in:
David Blaikie 2019-10-03 20:56:23 +00:00
parent 350147c746
commit 2ac586c58f
1 changed files with 25 additions and 15 deletions
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40
llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
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@ -2556,23 +2556,24 @@ void DwarfDebug::emitDebugARanges() {
}
}
/// Emit a single range list. We handle both DWARF v5 and earlier.
static void emitRangeList(DwarfDebug &DD, AsmPrinter *Asm,
const RangeSpanList &List) {
template <typename Ranges>
static void emitRangeList(DwarfDebug &DD, AsmPrinter *Asm, MCSymbol *Sym,
const Ranges &R, const DwarfCompileUnit &CU,
unsigned BaseAddressx, unsigned OffsetPair,
unsigned StartxLength, unsigned EndOfList,
StringRef (*StringifyEnum)(unsigned)) {
auto DwarfVersion = DD.getDwarfVersion();
// Emit our symbol so we can find the beginning of the range.
Asm->OutStreamer->EmitLabel(List.getSym());
Asm->OutStreamer->EmitLabel(Sym);
// Gather all the ranges that apply to the same section so they can share
// a base address entry.
MapVector<const MCSection *, std::vector<const RangeSpan *>> SectionRanges;
// Size for our labels.
auto Size = Asm->MAI->getCodePointerSize();
for (const RangeSpan &Range : List.getRanges())
for (const RangeSpan &Range : R)
SectionRanges[&Range.Begin->getSection()].push_back(&Range);
const DwarfCompileUnit &CU = List.getCU();
const MCSymbol *CUBase = CU.getBaseAddress();
bool BaseIsSet = false;
for (const auto &P : SectionRanges) {
@ -2588,8 +2589,8 @@ static void emitRangeList(DwarfDebug &DD, AsmPrinter *Asm,
BaseIsSet = true;
Base = DD.getSectionLabel(&P.second.front()->Begin->getSection());
if (DwarfVersion >= 5) {
Asm->OutStreamer->AddComment("DW_RLE_base_addressx");
Asm->OutStreamer->EmitIntValue(dwarf::DW_RLE_base_addressx, 1);
Asm->OutStreamer->AddComment(StringifyEnum(BaseAddressx));
Asm->OutStreamer->EmitIntValue(BaseAddressx, 1);
Asm->OutStreamer->AddComment(" base address index");
Asm->EmitULEB128(DD.getAddressPool().getIndex(Base));
} else {
@ -2612,8 +2613,8 @@ static void emitRangeList(DwarfDebug &DD, AsmPrinter *Asm,
if (Base) {
if (DwarfVersion >= 5) {
// Emit DW_RLE_offset_pair when we have a base.
Asm->OutStreamer->AddComment("DW_RLE_offset_pair");
Asm->OutStreamer->EmitIntValue(dwarf::DW_RLE_offset_pair, 1);
Asm->OutStreamer->AddComment(StringifyEnum(OffsetPair));
Asm->emitInt8(OffsetPair);
Asm->OutStreamer->AddComment(" starting offset");
Asm->EmitLabelDifferenceAsULEB128(Begin, Base);
Asm->OutStreamer->AddComment(" ending offset");
@ -2623,8 +2624,8 @@ static void emitRangeList(DwarfDebug &DD, AsmPrinter *Asm,
Asm->EmitLabelDifference(End, Base, Size);
}
} else if (DwarfVersion >= 5) {
Asm->OutStreamer->AddComment("DW_RLE_startx_length");
Asm->OutStreamer->EmitIntValue(dwarf::DW_RLE_startx_length, 1);
Asm->OutStreamer->AddComment(StringifyEnum(StartxLength));
Asm->emitInt8(StartxLength);
Asm->OutStreamer->AddComment(" start index");
Asm->EmitULEB128(DD.getAddressPool().getIndex(Begin));
Asm->OutStreamer->AddComment(" length");
@ -2636,8 +2637,8 @@ static void emitRangeList(DwarfDebug &DD, AsmPrinter *Asm,
}
}
if (DwarfVersion >= 5) {
Asm->OutStreamer->AddComment("DW_RLE_end_of_list");
Asm->OutStreamer->EmitIntValue(dwarf::DW_RLE_end_of_list, 1);
Asm->OutStreamer->AddComment(StringifyEnum(EndOfList));
Asm->emitInt8(EndOfList);
} else {
// Terminate the list with two 0 values.
Asm->OutStreamer->EmitIntValue(0, Size);
@ -2645,6 +2646,15 @@ static void emitRangeList(DwarfDebug &DD, AsmPrinter *Asm,
}
}
/// Emit a single range list. We handle both DWARF v5 and earlier.
static void emitRangeList(DwarfDebug &DD, AsmPrinter *Asm,
const RangeSpanList &List) {
emitRangeList(DD, Asm, List.getSym(), List.getRanges(), List.getCU(),
dwarf::DW_RLE_base_addressx, dwarf::DW_RLE_offset_pair,
dwarf::DW_RLE_startx_length, dwarf::DW_RLE_end_of_list,
llvm::dwarf::RangeListEncodingString);
}
static void emitDebugRangesImpl(DwarfDebug &DD, AsmPrinter *Asm,
const DwarfFile &Holder, MCSymbol *TableEnd) {
for (const RangeSpanList &List : Holder.getRangeLists())