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Dead code elimination. 

llvm-svn: 130984
This commit is contained in:
Rafael Espindola 2011-05-06 14:56:22 +00:00
parent ef317a27ff
commit a716096677
7 changed files with 4 additions and 123 deletions
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7
llvm/include/llvm/MC/MCAsmInfo.h
View File

@ -269,9 +269,6 @@ namespace llvm {
/// SupportsExceptionHandling - True if target supports exception handling.
ExceptionHandling::ExceptionsType ExceptionsType; // Defaults to None
/// RequiresFrameSection - true if the Dwarf2 output needs a frame section
bool DwarfRequiresFrameSection; // Defaults to true.
/// DwarfUsesInlineInfoSection - True if DwarfDebugInlineSection is used to
/// encode inline subroutine information.
bool DwarfUsesInlineInfoSection; // Defaults to false.
@ -465,10 +462,6 @@ namespace llvm {
(ExceptionsType == ExceptionHandling::DwarfCFI ||
ExceptionsType == ExceptionHandling::ARM);
}
bool doesDwarfRequireFrameSection() const {
return DwarfRequiresFrameSection;
}
bool doesDwarfUsesInlineInfoSection() const {
return DwarfUsesInlineInfoSection;
}

5
llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
View File

@ -596,7 +596,7 @@ bool AsmPrinter::needsCFIMoves() {
if (UnwindTablesMandatory)
return true;
if (MMI->hasDebugInfo() && !MAI->doesDwarfRequireFrameSection())
if (MMI->hasDebugInfo())
return true;
if (MF->getFunction()->doesNotThrow())
@ -608,8 +608,7 @@ bool AsmPrinter::needsCFIMoves() {
void AsmPrinter::emitPrologLabel(const MachineInstr &MI) {
MCSymbol *Label = MI.getOperand(0).getMCSymbol();
if (MAI->doesDwarfRequireFrameSection() ||
MAI->getExceptionHandlingType() != ExceptionHandling::DwarfCFI)
if (MAI->getExceptionHandlingType() != ExceptionHandling::DwarfCFI)
OutStreamer.EmitLabel(Label);
if (MAI->getExceptionHandlingType() != ExceptionHandling::DwarfCFI)

100
llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
View File

@ -256,7 +256,7 @@ DwarfDebug::DwarfDebug(AsmPrinter *A, Module *M)
CurrentFnDbgScope(0), PrevLabel(NULL) {
NextStringPoolNumber = 0;
DwarfFrameSectionSym = DwarfInfoSectionSym = DwarfAbbrevSectionSym = 0;
DwarfInfoSectionSym = DwarfAbbrevSectionSym = 0;
DwarfStrSectionSym = TextSectionSym = 0;
DwarfDebugRangeSectionSym = DwarfDebugLocSectionSym = 0;
FunctionBeginSym = FunctionEndSym = 0;
@ -1261,14 +1261,6 @@ void DwarfDebug::endModule() {
Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("section_end", i));
}
// Emit common frame information.
emitCommonDebugFrame();
// Emit function debug frame information
for (std::vector<FunctionDebugFrameInfo>::iterator I = DebugFrames.begin(),
E = DebugFrames.end(); I != E; ++I)
emitFunctionDebugFrame(*I);
// Compute DIE offsets and sizes.
computeSizeAndOffsets();
@ -2261,11 +2253,6 @@ void DwarfDebug::EmitSectionLabels() {
const TargetLoweringObjectFile &TLOF = Asm->getObjFileLowering();
// Dwarf sections base addresses.
if (Asm->MAI->doesDwarfRequireFrameSection()) {
DwarfFrameSectionSym =
EmitSectionSym(Asm, TLOF.getDwarfFrameSection(), "section_debug_frame");
}
DwarfInfoSectionSym =
EmitSectionSym(Asm, TLOF.getDwarfInfoSection(), "section_info");
DwarfAbbrevSectionSym =
@ -2473,91 +2460,6 @@ void DwarfDebug::emitEndOfLineMatrix(unsigned SectionEnd) {
Asm->EmitInt8(1);
}
/// emitCommonDebugFrame - Emit common frame info into a debug frame section.
///
void DwarfDebug::emitCommonDebugFrame() {
if (!Asm->MAI->doesDwarfRequireFrameSection())
return;
int stackGrowth = Asm->getTargetData().getPointerSize();
if (Asm->TM.getFrameLowering()->getStackGrowthDirection() ==
TargetFrameLowering::StackGrowsDown)
stackGrowth *= -1;
// Start the dwarf frame section.
Asm->OutStreamer.SwitchSection(
Asm->getObjFileLowering().getDwarfFrameSection());
Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_frame_common"));
Asm->OutStreamer.AddComment("Length of Common Information Entry");
Asm->EmitLabelDifference(Asm->GetTempSymbol("debug_frame_common_end"),
Asm->GetTempSymbol("debug_frame_common_begin"), 4);
Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_frame_common_begin"));
Asm->OutStreamer.AddComment("CIE Identifier Tag");
Asm->EmitInt32((int)dwarf::DW_CIE_ID);
Asm->OutStreamer.AddComment("CIE Version");
Asm->EmitInt8(dwarf::DW_CIE_VERSION);
Asm->OutStreamer.AddComment("CIE Augmentation");
Asm->OutStreamer.EmitIntValue(0, 1, /*addrspace*/0); // nul terminator.
Asm->EmitULEB128(1, "CIE Code Alignment Factor");
Asm->EmitSLEB128(stackGrowth, "CIE Data Alignment Factor");
Asm->OutStreamer.AddComment("CIE RA Column");
const TargetRegisterInfo *RI = Asm->TM.getRegisterInfo();
const TargetFrameLowering *TFI = Asm->TM.getFrameLowering();
Asm->EmitInt8(RI->getDwarfRegNum(RI->getRARegister(), false));
std::vector<MachineMove> Moves;
TFI->getInitialFrameState(Moves);
Asm->EmitFrameMoves(Moves, 0, false);
Asm->EmitAlignment(2);
Asm->OutStreamer.EmitLabel(Asm->GetTempSymbol("debug_frame_common_end"));
}
/// emitFunctionDebugFrame - Emit per function frame info into a debug frame
/// section.
void DwarfDebug::
emitFunctionDebugFrame(const FunctionDebugFrameInfo &DebugFrameInfo) {
if (!Asm->MAI->doesDwarfRequireFrameSection())
return;
// Start the dwarf frame section.
Asm->OutStreamer.SwitchSection(
Asm->getObjFileLowering().getDwarfFrameSection());
Asm->OutStreamer.AddComment("Length of Frame Information Entry");
MCSymbol *DebugFrameBegin =
Asm->GetTempSymbol("debug_frame_begin", DebugFrameInfo.Number);
MCSymbol *DebugFrameEnd =
Asm->GetTempSymbol("debug_frame_end", DebugFrameInfo.Number);
Asm->EmitLabelDifference(DebugFrameEnd, DebugFrameBegin, 4);
Asm->OutStreamer.EmitLabel(DebugFrameBegin);
Asm->OutStreamer.AddComment("FDE CIE offset");
Asm->EmitSectionOffset(Asm->GetTempSymbol("debug_frame_common"),
DwarfFrameSectionSym);
Asm->OutStreamer.AddComment("FDE initial location");
MCSymbol *FuncBeginSym =
Asm->GetTempSymbol("func_begin", DebugFrameInfo.Number);
Asm->OutStreamer.EmitSymbolValue(FuncBeginSym,
Asm->getTargetData().getPointerSize(),
0/*AddrSpace*/);
Asm->OutStreamer.AddComment("FDE address range");
Asm->EmitLabelDifference(Asm->GetTempSymbol("func_end",DebugFrameInfo.Number),
FuncBeginSym, Asm->getTargetData().getPointerSize());
Asm->EmitFrameMoves(DebugFrameInfo.Moves, FuncBeginSym, false);
Asm->EmitAlignment(2);
Asm->OutStreamer.EmitLabel(DebugFrameEnd);
}
/// emitDebugPubNames - Emit visible names into a debug pubnames section.
///
void DwarfDebug::emitDebugPubNames() {

10
llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h
View File

@ -269,7 +269,7 @@ class DwarfDebug {
// 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 *DwarfInfoSectionSym, *DwarfAbbrevSectionSym;
MCSymbol *DwarfStrSectionSym, *TextSectionSym, *DwarfDebugRangeSectionSym;
MCSymbol *DwarfDebugLocSectionSym;
MCSymbol *FunctionBeginSym, *FunctionEndSym;
@ -338,14 +338,6 @@ private:
///
void emitEndOfLineMatrix(unsigned SectionEnd);
/// emitCommonDebugFrame - Emit common frame info into a debug frame section.
///
void emitCommonDebugFrame();
/// emitFunctionDebugFrame - Emit per function frame info into a debug frame
/// section.
void emitFunctionDebugFrame(const FunctionDebugFrameInfo &DebugFrameInfo);
/// emitDebugPubNames - Emit visible names into a debug pubnames section.
///
void emitDebugPubNames();

1
llvm/lib/MC/MCAsmInfo.cpp
View File

@ -74,7 +74,6 @@ MCAsmInfo::MCAsmInfo() {
HasLEB128 = false;
SupportsDebugInformation = false;
ExceptionsType = ExceptionHandling::None;
DwarfRequiresFrameSection = false;
DwarfUsesInlineInfoSection = false;
DwarfRequiresRelocationForStmtList = true;
DwarfSectionOffsetDirective = 0;

2
llvm/lib/Target/ARM/ARMMCAsmInfo.cpp
View File

@ -70,8 +70,6 @@ ARMELFMCAsmInfo::ARMELFMCAsmInfo() {
WeakRefDirective = "\t.weak\t";
HasLCOMMDirective = true;
DwarfRequiresFrameSection = false;
SupportsDebugInformation = true;
// Exceptions handling

2
llvm/lib/Target/X86/X86MCAsmInfo.cpp
View File

@ -108,8 +108,6 @@ X86ELFMCAsmInfo::X86ELFMCAsmInfo(const Triple &T) {
// Exceptions handling
ExceptionsType = ExceptionHandling::DwarfCFI;
DwarfRequiresFrameSection = false;
// OpenBSD has buggy support for .quad in 32-bit mode, just split into two
// .words.
if (T.getOS() == Triple::OpenBSD && T.getArch() == Triple::x86)