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Allow optionally generating pubnames section in DWARF info. Introduce

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option "generate-dwarf-pubnames" to control it, set to "false" by default.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174981 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Krzysztof Parzyszek
2013-02-12 18:00:14 +00:00
parent 9a790581c0
commit c5ef7eee3c
7 changed files with 226 additions and 2 deletions
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69
lib/CodeGen/AsmPrinter/DwarfDebug.cpp
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@ -54,6 +54,10 @@ static cl::opt<bool> UnknownLocations("use-unknown-locations", cl::Hidden,
cl::desc("Make an absence of debug location information explicit."),
cl::init(false));
static cl::opt<bool> GenerateDwarfPubNamesSection("generate-dwarf-pubnames",
cl::Hidden, cl::ZeroOrMore, cl::init(false),
cl::desc("Generate DWARF pubnames section"));
namespace {
enum DefaultOnOff {
Default, Enable, Disable
@ -733,7 +737,9 @@ void DwarfDebug::constructSubprogramDIE(CompileUnit *TheCU,
// Add to context owner.
TheCU->addToContextOwner(SubprogramDie, SP.getContext());
return;
// Expose as global, if requested.
if (GenerateDwarfPubNamesSection)
TheCU->addGlobalName(SP.getName(), SubprogramDie);
}
// Collect debug info from named mdnodes such as llvm.dbg.enum and llvm.dbg.ty.
@ -1028,6 +1034,10 @@ void DwarfDebug::endModule() {
emitAccelTypes();
}
// Emit info into a debug pubnames section, if requested.
if (GenerateDwarfPubNamesSection)
emitDebugPubnames();
// Emit info into a debug pubtypes section.
// TODO: When we don't need the option anymore we can
// remove all of the code that adds to the table.
@ -1784,6 +1794,8 @@ void DwarfDebug::emitSectionLabels() {
DwarfLineSectionSym =
emitSectionSym(Asm, TLOF.getDwarfLineSection(), "section_line");
emitSectionSym(Asm, TLOF.getDwarfLocSection());
if (GenerateDwarfPubNamesSection)
emitSectionSym(Asm, TLOF.getDwarfPubNamesSection());
emitSectionSym(Asm, TLOF.getDwarfPubTypesSection());
DwarfStrSectionSym =
emitSectionSym(Asm, TLOF.getDwarfStrSection(), "info_string");
@ -2119,6 +2131,61 @@ void DwarfDebug::emitAccelTypes() {
AT.Emit(Asm, SectionBegin, &InfoHolder);
}
/// emitDebugPubnames - Emit visible names into a debug pubnames section.
///
void DwarfDebug::emitDebugPubnames() {
const MCSection *ISec = Asm->getObjFileLowering().getDwarfInfoSection();
typedef DenseMap<const MDNode*, CompileUnit*> CUMapType;
for (CUMapType::iterator I = CUMap.begin(), E = CUMap.end(); I != E; ++I) {
CompileUnit *TheCU = I->second;
unsigned ID = TheCU->getUniqueID();
if (TheCU->getGlobalNames().empty())
continue;
// Start the dwarf pubnames section.
Asm->OutStreamer.SwitchSection(
Asm->getObjFileLowering().getDwarfPubNamesSection());
Asm->OutStreamer.AddComment("Length of Public Names Info");
Asm->EmitLabelDifference(Asm->GetTempSymbol("pubnames_end", ID),
Asm->GetTempSymbol("pubnames_begin", ID), 4);
Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("pubnames_begin", ID));
Asm->OutStreamer.AddComment("DWARF Version");
Asm->EmitInt16(dwarf::DWARF_VERSION);
Asm->OutStreamer.AddComment("Offset of Compilation Unit Info");
Asm->EmitSectionOffset(Asm->GetTempSymbol(ISec->getLabelBeginName(), ID),
DwarfInfoSectionSym);
Asm->OutStreamer.AddComment("Compilation Unit Length");
Asm->EmitLabelDifference(Asm->GetTempSymbol(ISec->getLabelEndName(), ID),
Asm->GetTempSymbol(ISec->getLabelBeginName(), ID),
4);
const StringMap<DIE*> &Globals = TheCU->getGlobalNames();
for (StringMap<DIE*>::const_iterator
GI = Globals.begin(), GE = Globals.end(); GI != GE; ++GI) {
const char *Name = GI->getKeyData();
const DIE *Entity = GI->second;
Asm->OutStreamer.AddComment("DIE offset");
Asm->EmitInt32(Entity->getOffset());
if (Asm->isVerbose())
Asm->OutStreamer.AddComment("External Name");
Asm->OutStreamer.EmitBytes(StringRef(Name, strlen(Name)+1), 0);
}
Asm->OutStreamer.AddComment("End Mark");
Asm->EmitInt32(0);
Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("pubnames_end", ID));
}
}
void DwarfDebug::emitDebugPubTypes() {
for (DenseMap<const MDNode *, CompileUnit *>::iterator I = CUMap.begin(),
E = CUMap.end(); I != E; ++I) {