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simplify EmitSectionOffset a little bit, improve comments.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100360 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-04-04 22:25:14 +00:00
parent 1d20473c9d
commit 2e3ebedc88
3 changed files with 27 additions and 18 deletions
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14
lib/CodeGen/AsmPrinter/DwarfDebug.cpp
View File

@ -2566,8 +2566,7 @@ 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"), "section_abbrev");
Asm->OutStreamer.AddComment("Address Size (in bytes)");
Asm->EmitInt8(TD->getPointerSize());
@ -2879,7 +2878,7 @@ emitFunctionDebugFrame(const FunctionDebugFrameInfo &DebugFrameInfo) {
Asm->OutStreamer.AddComment("FDE CIE offset");
EmitSectionOffset(Asm->GetTempSymbol("debug_frame_common"),
Asm->GetTempSymbol("section_debug_frame"));
"section_debug_frame");
Asm->OutStreamer.AddComment("FDE initial location");
MCSymbol *FuncBeginSym =
@ -2918,7 +2917,7 @@ void DwarfDebug::emitDebugPubNames() {
Asm->OutStreamer.AddComment("Offset of Compilation Unit Info");
EmitSectionOffset(Asm->GetTempSymbol("info_begin", ModuleCU->getID()),
Asm->GetTempSymbol("section_info"));
"section_info");
Asm->OutStreamer.AddComment("Compilation Unit Length");
Asm->EmitLabelDifference(Asm->GetTempSymbol("info_end", ModuleCU->getID()),
@ -2962,7 +2961,7 @@ void DwarfDebug::emitDebugPubTypes() {
Asm->OutStreamer.AddComment("Offset of Compilation ModuleCU Info");
EmitSectionOffset(Asm->GetTempSymbol("info_begin", ModuleCU->getID()),
Asm->GetTempSymbol("section_info"));
"section_info");
Asm->OutStreamer.AddComment("Compilation ModuleCU Length");
Asm->EmitLabelDifference(Asm->GetTempSymbol("info_end", ModuleCU->getID()),
@ -3108,11 +3107,10 @@ void DwarfDebug::emitDebugInlineInfo() {
Asm->OutStreamer.EmitIntValue(0, 1, 0); // nul terminator.
} else
EmitSectionOffset(getStringPoolEntry(getRealLinkageName(LName)),
Asm->GetTempSymbol("section_str"));
"section_str");
Asm->OutStreamer.AddComment("Function name");
EmitSectionOffset(getStringPoolEntry(Name),
Asm->GetTempSymbol("section_str"));
EmitSectionOffset(getStringPoolEntry(Name), "section_str");
Asm->EmitULEB128(Labels.size(), "Inline count");
for (SmallVector<InlineInfoLabels, 4>::iterator LI = Labels.begin(),

20
lib/CodeGen/AsmPrinter/DwarfPrinter.cpp
View File

@ -39,17 +39,23 @@ DwarfPrinter::DwarfPrinter(AsmPrinter *A)
void DwarfPrinter::EmitSectionOffset(const MCSymbol *Label,
const MCSymbol *Section) {
if (!MAI->isAbsoluteDebugSectionOffsets())
return Asm->EmitLabelDifference(Label, Section, 4);
// On COFF targets, we have to emit the weird .secrel32 directive.
const char *SectionLabel) {
// On COFF targets, we have to emit the special .secrel32 directive.
if (const char *SecOffDir = MAI->getDwarfSectionOffsetDirective()) {
// FIXME: MCize.
Asm->OutStreamer.EmitRawText(SecOffDir + Twine(Label->getName()));
} else {
Asm->OutStreamer.EmitSymbolValue(Label, 4, 0/*AddrSpace*/);
return;
}
// If the section in question will end up with an address of 0 anyway, we can
// just emit an absolute reference to save a relocation.
if (MAI->isAbsoluteDebugSectionOffsets()) {
Asm->OutStreamer.EmitSymbolValue(Label, 4, 0/*AddrSpace*/);
return;
}
MCSymbol *SectionSym = Asm->GetTempSymbol(SectionLabel);
Asm->EmitLabelDifference(Label, SectionSym, 4);
}
/// EmitFrameMoves - Emit frame instructions to describe the layout of the

11
lib/CodeGen/AsmPrinter/DwarfPrinter.h
View File

@ -74,9 +74,14 @@ public:
const MCAsmInfo *getMCAsmInfo() const { return MAI; }
const TargetData *getTargetData() const { return TD; }
/// EmitSectionOffset - Emit a 4-byte "Label-Section" value or use a special
/// purpose directive to emit a section offset if the target has one.
void EmitSectionOffset(const MCSymbol *Label, const MCSymbol *Section);
/// EmitSectionOffset - Emit the 4-byte offset of Label from the start of its
/// section. This can be done with a special directive if the target supports
/// it (e.g. cygwin) or by emitting it as an offset from a label at the start
/// of the section.
///
/// SectionLabel is the name of a temporary label emitted at the start of the
/// section.
void EmitSectionOffset(const MCSymbol *Label, const char *SectionLabel);
/// EmitFrameMoves - Emit frame instructions to describe the layout of the
/// frame.