Dead code elimination.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130984 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/MC/MCAsmInfo.h b/include/llvm/MC/MCAsmInfo.h
index 6800f2029fbdad8746ac8f0960227e80cc807b9c..67ea1c853aa80104eacffaf5f36035faef1db6e5 100644 (file)
--- a/include/llvm/MC/MCAsmInfo.h
+++ b/include/llvm/MC/MCAsmInfo.h
@@ -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;
     }

diff --git a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
index 31bf418178a2b330b31f70e10b28e78de6608c41..a68a13eed3b09d0aa85a845d8b25ec14c2122fcf 100644 (file)
--- a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -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)

diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index 194f1f14dd13229fb88c1afbf29e72975c47794e..bc72c4a4e5890675c7ecdcace6d5fc8d84c4ece9 100644 (file)
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -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() {

diff --git a/lib/CodeGen/AsmPrinter/DwarfDebug.h b/lib/CodeGen/AsmPrinter/DwarfDebug.h
index 25f2675d40f0af966cb5d474ea6a3e349754184c..4dc9de4e3ec91fd966177072c77327e5b11b14ab 100644 (file)
--- a/lib/CodeGen/AsmPrinter/DwarfDebug.h
+++ b/lib/CodeGen/AsmPrinter/DwarfDebug.h
@@ -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();

diff --git a/lib/MC/MCAsmInfo.cpp b/lib/MC/MCAsmInfo.cpp
index 5bb380399f958d34ef946f715f9e58eefc4b30b9..345eabc4d975294cd4714aa3c2d1717b148135f1 100644 (file)
--- a/lib/MC/MCAsmInfo.cpp
+++ b/lib/MC/MCAsmInfo.cpp
@@ -74,7 +74,6 @@ MCAsmInfo::MCAsmInfo() {
   HasLEB128 = false;
   SupportsDebugInformation = false;
   ExceptionsType = ExceptionHandling::None;
-  DwarfRequiresFrameSection = false;
   DwarfUsesInlineInfoSection = false;
   DwarfRequiresRelocationForStmtList = true;
   DwarfSectionOffsetDirective = 0;

diff --git a/lib/Target/ARM/ARMMCAsmInfo.cpp b/lib/Target/ARM/ARMMCAsmInfo.cpp
index a3f89e92f8eccfdd3f700a5875e9284561778a6e..53b4c95d38012bed1441e2bd43bd2e0ecf75da8d 100644 (file)
--- a/lib/Target/ARM/ARMMCAsmInfo.cpp
+++ b/lib/Target/ARM/ARMMCAsmInfo.cpp
@@ -70,8 +70,6 @@ ARMELFMCAsmInfo::ARMELFMCAsmInfo() {
   WeakRefDirective = "\t.weak\t";
   HasLCOMMDirective = true;
 
-  DwarfRequiresFrameSection = false;
-
   SupportsDebugInformation = true;
 
   // Exceptions handling

diff --git a/lib/Target/X86/X86MCAsmInfo.cpp b/lib/Target/X86/X86MCAsmInfo.cpp
index 83bba529a6895cda7a07771e7b51058f0b4bfc6f..2e1ec6317601a1c846cc65471a8ae7d360d3d465 100644 (file)
--- a/lib/Target/X86/X86MCAsmInfo.cpp
+++ b/lib/Target/X86/X86MCAsmInfo.cpp
@@ -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)