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Store an use the symbols emitted at the start of the debug

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sections instead of magically rematerializing them later.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100362 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-04-04 22:59:04 +00:00
parent fa070b0175
commit 9c69e28553
2 changed files with 59 additions and 45 deletions
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96
lib/CodeGen/AsmPrinter/DwarfDebug.cpp
View File

@ -304,6 +304,14 @@ DwarfDebug::DwarfDebug(AsmPrinter *A)
AbbreviationsSet(InitAbbreviationsSetSize), shouldEmit(false),
CurrentFnDbgScope(0), DebugTimer(0) {
NextStringPoolNumber = 0;
DwarfFrameSectionSym = 0;
DwarfInfoSectionSym = 0;
DwarfAbbrevSectionSym = 0;
DwarfStrSectionSym = 0;
TextSectionSym = 0;
DataSectionSym = 0;
if (TimePassesIsEnabled)
DebugTimer = new Timer("Dwarf Debug Writer");
}
@ -1667,8 +1675,7 @@ void DwarfDebug::constructCompileUnit(MDNode *N) {
addUInt(Die, dwarf::DW_AT_language, dwarf::DW_FORM_data1,
DIUnit.getLanguage());
addString(Die, dwarf::DW_AT_name, dwarf::DW_FORM_string, FN);
addLabel(Die, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr,
Asm->GetTempSymbol("text_begin"));
addLabel(Die, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr, TextSectionSym);
addLabel(Die, dwarf::DW_AT_high_pc, dwarf::DW_FORM_addr,
Asm->GetTempSymbol("text_end"));
// DW_AT_stmt_list is a offset of line number information for this
@ -1791,6 +1798,9 @@ void DwarfDebug::beginModule(Module *M) {
DebugInfoFinder DbgFinder;
DbgFinder.processModule(*M);
// Emit initial sections
EmitSectionLabels();
// Create all the compile unit DIEs.
for (DebugInfoFinder::iterator I = DbgFinder.compile_unit_begin(),
E = DbgFinder.compile_unit_end(); I != E; ++I)
@ -1832,9 +1842,6 @@ void DwarfDebug::beginModule(Module *M) {
Asm->OutStreamer.EmitDwarfFileDirective(i, FullPath.str());
}
}
// Emit initial sections
EmitSectionLabels();
}
/// endModule - Emit all Dwarf sections that should come after the content.
@ -2437,46 +2444,47 @@ void DwarfDebug::computeSizeAndOffsets() {
CompileUnitOffsets[ModuleCU] = 0;
}
/// EmitSectionLabels - Emit initial Dwarf declarations. This is necessary for cc
/// tools to recognize the object file contains Dwarf information.
static MCSymbol *EmitSectionSym(AsmPrinter *Asm, const MCSection *Section,
const char *SymbolStem) {
Asm->OutStreamer.SwitchSection(Section);
MCSymbol *TmpSym = Asm->GetTempSymbol(SymbolStem);
Asm->OutStreamer.EmitLabel(TmpSym);
return TmpSym;
}
/// EmitSectionLabels - Emit initial Dwarf sections with a label at
/// the start of each one.
void DwarfDebug::EmitSectionLabels() {
const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
// Dwarf sections base addresses.
if (MAI->doesDwarfRequireFrameSection()) {
Asm->OutStreamer.SwitchSection(TLOF.getDwarfFrameSection());
Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("section_debug_frame"));
}
DwarfFrameSectionSym =
EmitSectionSym(Asm, TLOF.getDwarfFrameSection(), "section_debug_frame");
}
Asm->OutStreamer.SwitchSection(TLOF.getDwarfInfoSection());
Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("section_info"));
Asm->OutStreamer.SwitchSection(TLOF.getDwarfAbbrevSection());
Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("section_abbrev"));
Asm->OutStreamer.SwitchSection(TLOF.getDwarfARangesSection());
Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("section_aranges"));
DwarfInfoSectionSym =
EmitSectionSym(Asm, TLOF.getDwarfInfoSection(), "section_info");
DwarfAbbrevSectionSym =
EmitSectionSym(Asm, TLOF.getDwarfAbbrevSection(), "section_abbrev");
EmitSectionSym(Asm, TLOF.getDwarfARangesSection(), "section_aranges");
if (const MCSection *MacroInfo = TLOF.getDwarfMacroInfoSection())
EmitSectionSym(Asm, MacroInfo,"section_macinfo");
if (const MCSection *LineInfoDirective = TLOF.getDwarfMacroInfoSection()) {
Asm->OutStreamer.SwitchSection(LineInfoDirective);
Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("section_macinfo"));
}
EmitSectionSym(Asm, TLOF.getDwarfLineSection(), "section_line");
EmitSectionSym(Asm, TLOF.getDwarfLocSection(), "section_loc");
EmitSectionSym(Asm, TLOF.getDwarfPubNamesSection(), "section_pubnames");
EmitSectionSym(Asm, TLOF.getDwarfPubTypesSection(), "section_pubtypes");
DwarfStrSectionSym =
EmitSectionSym(Asm, TLOF.getDwarfStrSection(), "section_str");
EmitSectionSym(Asm, TLOF.getDwarfRangesSection(), "section_ranges");
Asm->OutStreamer.SwitchSection(TLOF.getDwarfLineSection());
Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("section_line"));
Asm->OutStreamer.SwitchSection(TLOF.getDwarfLocSection());
Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("section_loc"));
Asm->OutStreamer.SwitchSection(TLOF.getDwarfPubNamesSection());
Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("section_pubnames"));
Asm->OutStreamer.SwitchSection(TLOF.getDwarfPubTypesSection());
Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("section_pubtypes"));
Asm->OutStreamer.SwitchSection(TLOF.getDwarfStrSection());
Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("section_str"));
Asm->OutStreamer.SwitchSection(TLOF.getDwarfRangesSection());
Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("section_ranges"));
Asm->OutStreamer.SwitchSection(TLOF.getTextSection());
Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("text_begin"));
Asm->OutStreamer.SwitchSection(TLOF.getDataSection());
Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("data_begin"));
TextSectionSym = EmitSectionSym(Asm, TLOF.getTextSection(), "text_begin");
// This is subtly used by the ocaml GC stuff.
DataSectionSym = EmitSectionSym(Asm, TLOF.getDataSection(), "data_begin");
}
/// emitDIE - Recusively Emits a debug information entry.
@ -2561,8 +2569,7 @@ void DwarfDebug::emitDebugInfo() {
Asm->OutStreamer.AddComment("DWARF version number");
Asm->EmitInt16(dwarf::DWARF_VERSION);
Asm->OutStreamer.AddComment("Offset Into Abbrev. Section");
EmitSectionOffset(Asm->GetTempSymbol("abbrev_begin"),
Asm->GetTempSymbol("section_abbrev"));
EmitSectionOffset(Asm->GetTempSymbol("abbrev_begin"), DwarfAbbrevSectionSym);
Asm->OutStreamer.AddComment("Address Size (in bytes)");
Asm->EmitInt8(TD->getPointerSize());
@ -2874,7 +2881,7 @@ emitFunctionDebugFrame(const FunctionDebugFrameInfo &DebugFrameInfo) {
Asm->OutStreamer.AddComment("FDE CIE offset");
EmitSectionOffset(Asm->GetTempSymbol("debug_frame_common"),
Asm->GetTempSymbol("section_debug_frame"));
DwarfFrameSectionSym);
Asm->OutStreamer.AddComment("FDE initial location");
MCSymbol *FuncBeginSym =
@ -2913,7 +2920,7 @@ void DwarfDebug::emitDebugPubNames() {
Asm->OutStreamer.AddComment("Offset of Compilation Unit Info");
EmitSectionOffset(Asm->GetTempSymbol("info_begin", ModuleCU->getID()),
Asm->GetTempSymbol("section_info"));
DwarfInfoSectionSym);
Asm->OutStreamer.AddComment("Compilation Unit Length");
Asm->EmitLabelDifference(Asm->GetTempSymbol("info_end", ModuleCU->getID()),
@ -2957,7 +2964,7 @@ void DwarfDebug::emitDebugPubTypes() {
Asm->OutStreamer.AddComment("Offset of Compilation ModuleCU Info");
EmitSectionOffset(Asm->GetTempSymbol("info_begin", ModuleCU->getID()),
Asm->GetTempSymbol("section_info"));
DwarfInfoSectionSym);
Asm->OutStreamer.AddComment("Compilation ModuleCU Length");
Asm->EmitLabelDifference(Asm->GetTempSymbol("info_end", ModuleCU->getID()),
@ -3103,11 +3110,10 @@ void DwarfDebug::emitDebugInlineInfo() {
Asm->OutStreamer.EmitIntValue(0, 1, 0); // nul terminator.
} else
EmitSectionOffset(getStringPoolEntry(getRealLinkageName(LName)),
Asm->GetTempSymbol("section_str"));
DwarfStrSectionSym);
Asm->OutStreamer.AddComment("Function name");
EmitSectionOffset(getStringPoolEntry(Name),
Asm->GetTempSymbol("section_str"));
EmitSectionOffset(getStringPoolEntry(Name), DwarfStrSectionSym);
Asm->EmitULEB128(Labels.size(), "Inline count");
for (SmallVector<InlineInfoLabels, 4>::iterator LI = Labels.begin(),

8
lib/CodeGen/AsmPrinter/DwarfDebug.h
View File

@ -206,6 +206,14 @@ class DwarfDebug : public DwarfPrinter {
std::vector<FunctionDebugFrameInfo> DebugFrames;
// Section Symbols: these are assembler temporary labels that are emitted at
// the beginning of each supported dwarf section. These are used to form
// section offsets and are created by EmitSectionLabels.
MCSymbol *DwarfFrameSectionSym, *DwarfInfoSectionSym, *DwarfAbbrevSectionSym;
MCSymbol *DwarfStrSectionSym, *TextSectionSym, *DataSectionSym;
private:
/// getSourceDirectoryAndFileIds - Return the directory and file ids that
/// maps to the source id. Source id starts at 1.
std::pair<unsigned, unsigned>